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  • 1158201. Wu, Mingxing
    et al.
    Lin, Xiao
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
    Ma, Tingli
    Low-Cost Molybdenum Carbide and Tungsten Carbide Counter Electrodes for Dye-Sensitized Solar Cells2011In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 50, no 15, p. 3520-3524Article in journal (Refereed)
  • 1158202. Wu, Mingxing
    et al.
    Lin, Xiao
    Wang, Liang
    Guo, Wei
    Wang, Yudi
    Xiao, Jinqiu
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry.
    Ma, Tingli
    In Situ Synthesized Economical Tungsten Dioxide Imbedded in Mesoporous Carbon for Dye-Sensitized Solar Cells As Counter Electrode Catalyst2011In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, no 45, p. 22598-22602Article in journal (Refereed)
    Abstract [en]

    Tungsten dioxide imbedded in mesoporous carbon (WO(2)-MC) was obtained by in situ synthesis and then introduced into dye-sensitized solar cells (DSCs) as a counter electrode (CE) catalyst. Catalytic activity for redox couple regeneration was improved significantly through combining high electrical conductivity and catalytic activity into one material, WO(2)-MC, in which WO(2) served as a catalyst and MC served as an electrical conductor. This has been proved by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The triiodide/iodide-based DSC using WO(2)-MC as CE showed a high power conversion efficiency (PCE) of 7.76%, which surpassed the performance of the DSC using traditional Pt CE (7.55%). In addition, the WO(2)-MC and WO(2) nanorods exhibited higher catalytic activity than Pt for the regeneration of a new organic redox couple, di-5-(1-methyltetrazole) disulfide/5-mercapto-1-methyltetrazole N-tetramethylammonium salt (T(2)/T(-)). The PCE of the T(2)/T(-)-based DSCs using WO(2)-MC, WO(2), and Pt were 5.22, 4.66, and 3.09%, respectively.

  • 1158203. Wu, Mingxing
    et al.
    Lin, Xiao
    Wang, Yudi
    Wang, Liang
    Guo, Wei
    Qu, Daidi
    Peng, Xiaojun
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
    Graetzel, Michael
    Ma, Tingli
    Economical Pt-Free Catalysts for Counter Electrodes of Dye-Sensitized Solar Cells2012In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 134, no 7, p. 3419-3428Article in journal (Refereed)
    Abstract [en]

    Three classes (carbides, nitrides and oxides) of nanoscaled early-transition-metal catalysts have been proposed to replace the expensive Pt catalyst as counter electrodes (CEs) in dye-sensitized solar cells (DSCs). Of these catalysts, Cr3C2, CrN, VC(N), VN, TiC, TiC(N), TiN, and V2O3 all showed excellent catalytic activity for the reduction of I-3(-) to I- in the electrolyte. Further, VC embedded in mesoporous carbon (VC-MC) was prepared through in situ synthesis. The I-3(-)/I- DSC based on the VC-MC CE reached a high power conversion efficiency (PCE) of 7.63%, comparable to the photovoltaic performance of the DSC using a Pt CE (7.50%). In addition, the carbide catalysts demonstrated catalytic activity higher than that of Pt for the regeneration of a new organic redox couple of T-2/T-. The T-2/T- DSCs using TiC and VC-MC CEs showed PCEs of 4.96 and 5.15%, much higher than that of the DSC using a Pt CE (3.66%). This work expands the list of potential CE catalysts, which can help reduce the cost of DSCs and thereby encourage their fundamental research and commercial application.

  • 1158204. Wu, Mingxing
    et al.
    Lin, Ya-nan
    Guo, Hongyue
    Ma, Tingli
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
    Highly effective Pt/MoSi2 composite counter electrode catalyst for dye-sensitized solar cell2014In: Journal of Power Sources, ISSN 0378-7753, E-ISSN 1873-2755, Vol. 263, p. 154-157Article in journal (Refereed)
    Abstract [en]

    MoSi2 is introduced into dye-sensitized solar cell (DSC) as counter electrode (CE) catalyst for the first time, and the DSC produces power conversion efficiency (PCE) of 4.87%. To improve the catalytic activity, Pt/MoSi2 composite catalyst is synthesized and it is found that 1.13 wt% of Pt loading is enough for achieving high catalytic activity. After optimization, the DSC using the Pt/MoSi2 composite CE shows high PCE of 7.68%, close to the Pt CE based DSC (7.94%).  

  • 1158205. Wu, Mingxing
    et al.
    Wang, Yudi
    Lin, Xiao
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Physical Chemistry.
    Ma, Tingli
    An Autocatalytic Factor in the Loss of Efficiency in Dye-Sensitized Solar Cells2012In: ChemCatChem, ISSN 1867-3880, E-ISSN 1867-3899, Vol. 4, no 9, p. 1255-1258Article in journal (Refereed)
  • 1158206. Wu, Mingxing
    et al.
    Wang, Yudi
    Lin, Xiao
    Yu, Naisen
    Wang, Liang
    Wang, Linlin
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
    Ma, Tingli
    Economical and effective sulfide catalysts for dye-sensitized solar cells as counter electrodes2011In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 13, no 43, p. 19298-19301Article in journal (Refereed)
    Abstract [en]

    Molybdenum sulfide (MoS(2)) and tungsten sulfide (WS(2)) are proposed as counter electrode (CE) catalysts in a I(3)(-)/I(-) and T(2)/T(-) based dye-sensitized solar cells (DSCs) system. The I(3)(-)/I(-) based DSCs using MoS(2) and WS(2) CEs achieved power conversion efficiencies of 7.59% and 7.73%, respectively.

  • 1158207. Wu, Mingxing
    et al.
    Zhang, Qingyu
    Xiao, Jinqiu
    Ma, Chunyu
    Lin, Xiao
    Miao, Chunyu
    He, Youjing
    Gao, Yurong
    Hagfeldt, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical and Analytical Chemistry, Physical Chemistry.
    Ma, Tingli
    Two flexible counter electrodes based on molybdenum and tungsten nitrides for dye-sensitized solar cells2011In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 21, no 29, p. 10761-10766Article in journal (Refereed)
    Abstract [en]

    Two novel flexible counter electrodes (CEs) on Ti sheets using molybdenum and tungsten nitrides (Mo(2)N, W(2)N) as catalysts were synthesized and used in a dye-sensitized solar cell (DSC) system. High catalytic activity of the two nitride CEs for the reduction of triiodide were proved by cyclic voltammetry, electrochemical impedance spectroscopy and Tafel-polarization measurements. The DSCs based on Mo(2)N and W(2)N CEs achieved power conversion efficiencies of 6.38 and 5.81%, reaching 91 and 83% of the photovoltaic performance of the DSC using a Pt CE, respectively. This research paves a promising way to develop new CE catalysts and reduce the cost of DSCs.

  • 1158208. Wu, Mousheng
    et al.
    Nilsson, Per
    Henriksson, Niklas
    Niedzwiecka, Anna
    Lim, Meng Kiat
    Cheng, Zhihong
    Kokkoris, Kyriakos
    Virtanen, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Cell and Molecular Biology, Molecular Biology.
    Song, Haiwei
    Structural basis of m(7)GpppG binding to poly(A)-specific ribonuclease2009In: Structure, ISSN 0969-2126, E-ISSN 1878-4186, Vol. 17, no 2, p. 276-286Article in journal (Refereed)
    Abstract [en]

    Poly(A)-specific ribonuclease (PARN) is a homodimeric, processive, and cap-interacting 3' exoribonuclease that efficiently degrades eukaryotic mRNA poly(A) tails. The crystal structure of a C-terminally truncated PARN in complex with m(7)GpppG reveals that, in one subunit, m(7)GpppG binds to a cavity formed by the RRM domain and the nuclease domain, whereas in the other subunit, it binds almost exclusively to the RRM domain. Importantly, our structural and competition data show that the cap-binding site overlaps with the active site in the nuclease domain. Mutational analysis demonstrates that residues involved in m(7)G recognition are crucial for cap-stimulated deadenylation activity, and those involved in both cap and poly(A) binding are important for catalysis. A modeled PARN, which shows that the RRM domain from one subunit and the R3H domain from the other subunit enclose the active site, provides a structural foundation for further studies to elucidate the mechanism of PARN-mediated deadenylation.

  • 1158209.
    Wu, Mousong
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
    Constraining Parameter Uncertainty in Simulations of Water and Heat Dynamics in Seasonally Frozen Soil Using Limited Observed Data2016In: Water, ISSN 2073-4441, Vol. 8Article in journal (Refereed)
  • 1158210.
    Wu, Mousong
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
    Coupled processes in seasonally frozen soils: Merging experiments and simulations2016Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Soil freezing/thawing is of importance in the transport of water, heat and solute, with coupled effects. Due to complexity in soil freezing/thawing, uncertainty could be influential in both experimentation and simulation work in frozen soils. Solute and water in frozen soil could reduce the freezing point, resulting in uncertainty in simulation water, heat and solute processes as well as in estimation of frozen soil evaporation. High salinity and groundwater level could result in high soil evaporation during wintertime. Seasonal courses in energy and water balance on surface have shown to be influential to soil water and heat dynamics, as well as in salt accumulation during wintertime. Water and solute accumulated during freezing period resulted in high evaporation during thawing period and enhanced surface salinization. Diurnal changes in surface energy partitioning resulted in significant cycle of freezing/thawing as well as in evaporation/condensation in surface layer, which could in turn affect atmosphere. Uncertainties in experiments and simulations were detectable in investigation of seasonally frozen soils with limited methods and simplified representations of reality in two agricultural fields in northern China. Soil water and solute contents have shown to be more uncertain than soil temperatures in both measurements and simulations. The combination of experiments with process-based model (CoupModel) has proven to be useful in understanding freezing/thawing processes and in identification of uncertainty, when Monte-Carlo based methods were used for evaluation of simulations. Correlations between parameters and model performance indices needed to be taken into account carefully in calibration of the process-based model. Parameters related to soil hydraulic processes and surface energy processes were more sensitive when using different datasets for calibration. In using multiple model performance indicators for multi-objective evaluation, the trade-offs between them have shown to be a source of uncertainty in calibration. More proper representations of the reality in model (e.g., soil hydraulic and thermal properties) and more detailed measurements (e.g., soil liquid water content and solute concentration) as input would be efficient in reducing uncertainty. Relationships between groundwater, soil and climate change would be of high interest for better understanding of cold regions water and energy balance.

  • 1158211.
    Wu, Mousong
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
    Experimental study on evaporation from seasonally frozen soils under various water, solute and groundwater conditions in Inner Mongolia, China2016In: Journal of Hydrology, ISSN 0022-1694, E-ISSN 1879-2707, Vol. 535, p. 46-53Article in journal (Refereed)
  • 1158212.
    Wu, Mousong
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
    Modeling seasonally frozen soils with two different datasets to identify the ability to reduce parameter uncertaintyManuscript (preprint) (Other academic)
    Abstract [en]

    Calibration and uncertainty analysis with selected parameters were conducted for two seasonally frozen soils in north China. A trade-off existed in good model performance indicators on water, heat or energy balance. Correlations between parameter values and model performances also showed a trade-off. Uncertainties in obtained parameter distributions were detected due to differences in calibration datasets, as well as complexity in frozen soils. Results showed that even with different datasets in calibration, most of the parameters calibrated showed common ranges. This indicated the availability in using common reasonable parameter sets for simulations in different frozen soils. Except for common ranges for most calibrated parameters, site-specified characteristics were also detected for each site, with totally different parameter ranges given two different datasets for calibration. Parameters related to soil hydraulic conductivity ( ) and surface aerodynamics ( ) were detected to be two site specific parameters in two sites, given datasets and calibration methods in this study. The uncertainty and sensitivity for site specific parameters should also be taken into consideration in choice of reasonable ranges for calibration. More detailed studies on site specific parameters would be of importance for better representations of water and energy balance in different seasonally frozen soils in cold regions.

  • 1158213.
    Wu, Mousong
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
    Simulations of water, heat, and solute transport in partially frozen soilsManuscript (preprint) (Other academic)
    Abstract [en]

    Experiments for soil freezing/thawing were conducted in two seasonally frozen agricultural fields in northern China during 2011/2012 and 2012/2013 wintertime, respectively. Mass balance was checked based on measured data at various depths. Simulation work was conducted by combining CoupModel with Monte-Carlo sampling method to achieve parameter sets with equally good performance. Uncertainties existed in both measurements and model due to complexity in freezing/thawing processes as well as in surface energy partitioning. Parameters related to surface radiation and soil frost were strongly constrained with datasets available in two sites combining multi-criterion on outputs. Simulated soil heat process were better described than soil water processes given the data obtained for calibration. Model performance was improved with consideration of solute effects on freezing point depression. More detailed solute transport processes in CoupModel needed to be improved by taking more processes such as diffusion and expulsion into consideration based on more precise experimental results, to reduce uncertainty in model. Generally, combination of measurement with process-based model and Monte-Carlo sampling method provided an approach for understanding of solute transport as well as its influences on soil freezing/thawing in cold arid agricultural regions. Incorporating more detailed descriptions of processes for frozen soil in the model can be justified if uncertainties in measurements can be reduced by introducing of high-precision novel technologies.

  • 1158214.
    Wu, Mousong
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering.
    Water, Heat and Solute processes in Seasonally frozen Soils: Experimental and Modeling Study2015Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Soil freezing and thawing is of importance in transport of water, heat and solute, which has coupled effects. Solute type and solute content in frozen soil could influence the osmotic potential of frozen soil and decrease freezing point, resulting in differences in soil freezing characteristic curves under various solute conditions. Prediction model provides an approach for estimating soil freezing characteristic curves under various water and solute conditions based on soil freezing characteristic curve obtained at certain water and solute conditions. Water, heat and solute transport in seasonally frozen soil is a coupled process strongly linked to evaporation and energy balance of soil surface. High solute content and shallow GWTD provide good conditions for water and solute accumulation in surface layer, which would result in more evaporation during thawing. Also, high solute content in upper layer would cause more liquid water to exist in upper layer, which may enhance evaporation during freezing period. Obvious increase in cumulative evaporation amount was detected for frost tube experiments, 51.0, 96.6, to 114.0 mm when initial solute content increased from 0.2%, 0.4%, to 0.6%, and initial GWTD of 1.5 m. Similar trends were observed for other GWTD and solute treatments. Water and heat transport simulated by the CoupModel combined with GLUE calibration showed good performances, when constrained by certain criteria. Uncertainties were investigated using ensemble of modeling results. Simulated energy partitioning showed intensive oscillations in daily courses during soil freezing/thawing periods and strongly influenced the stability of energy system on surface of soil. The study demonstrated the complexity in water, heat and solute transport in seasonally frozen soil, and the necessity of combining experimental data with numerical model for better understanding the processes as well in decision making for irrigation district water resources management.

  • 1158215.
    Wu, Mousong
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Jansson, Per-Erik
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Tan, X.
    Wu, J.
    Huang, J.
    Simulations of water and heat dynamics in a seasonally frozen soil using field data to improve understanding,Manuscript (preprint) (Other academic)
  • 1158216.
    Wu, Mousong
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering. Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China ; Nanjing Univ, Int Inst Earth Syst Sci, Nanjing 210023, Jiangsu, Peoples R China.
    Jiesheng, Huang
    Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China.
    Xiao, Tan
    Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China.
    Jingwei, Wu
    Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China.
    Water, Salt and Heat Influences on Carbon and Nitrogen Dynamics in Seasonally Frozen Soils in Hetao Irrigation District, Inner Mongolia, China2019In: Pedosphere, ISSN 1002-0160, E-ISSN 2210-5107, Vol. 29, no 5, p. 632-641Article in journal (Refereed)
    Abstract [en]

    To investigate carbon soils under saline and shallow groundwater supply conditions, in-situ lysimeter experiments with different groundwater table depths (WTD = 1.8 and 2.2 m) were conducted in Inner Mongolia, China during the wintertime of 2012-2013. Changes in soil organic C and total N in multiple layers during various periods, as well as their relationships with soil water, salt, and heat dynamics were analyzed. Accumulation of soil organic C and total N during freezing periods was strongly related to water and salt accumulation under temperature and water potential gradients. Water and salt showed direct influences on soil C and N dynamics by transporting them to upper layer and changing soil microbial activity. Salt accumulation in the upper layer during freezing and thawing of soil affected microbial activity by lowering osmotic potential, resulting in lower C/N ratio. Nitrogen in soil tended to be more mobile with water during freezing and thawing than organic C, and the groundwater table also served as a water source for consecutive upward transport of dissolved N and C. The changes in C and N in the upper 10 cm soil layer served as a good sign for identification of water and salt influences on soil microbial activity during freezing/thawing.

  • 1158217.
    Wu, Mousong
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering, Land and Water Resources Engineering. Wuhan University, China.
    Tan, Xiao
    Huang, Jiesheng
    Wu, Jingwei
    Jansson, Per-Erik
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Solute and water effects on soil freezing characteristics based on laboratory experiments2015In: Cold Regions Science and Technology, ISSN 0165-232X, E-ISSN 1872-7441, Vol. 115, p. 22-29Article in journal (Refereed)
    Abstract [en]

    Laboratory experiments were conducted to study effects of water and solute on soil freezing using TDR and temperature sensor combination methods. ANOVA methods were applied for analyzing significance for solute influences on soil freezing characteristic curve (SFCC). Results showed that higher initial water content influenced the SFCC by increasing liquid water content at the same temperature due to more water connection with soil pores, and adsorbed by soil particles. ANOVA results showed solute content and solute type all had significant effects (P < 0.001 to P < 0.5) on soil freezing processes. And solute in soil resulted in a lower freezing point of soil, which made more liquid water co-exist with ice at negative temperatures. And solute concentration condensing due to liquid water decline would also impede soil freezing processes by decreasing osmotic potential. Due to the physical and chemical process of soil solution, different ions also presented some differences in SFCC parameter estimation. Based on a trial and error method, a prediction model was also built, and it behaved well in predicting SFCC under different water and solute conditions.

  • 1158218.
    Wu, Mousong
    et al.
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Wu, Jingwei
    Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China..
    Tan, Xiao
    Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China.;Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu 610065, Sichuan, Peoples R China..
    Huang, Jiesheng
    Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China..
    Jansson, Per Erik
    KTH, School of Architecture and the Built Environment (ABE), Sustainable development, Environmental science and Engineering.
    Zhang, Wenxin
    Univ Copenhagen, Ctr Permafrost, Dept Geosci & Nat Resource Management, DK-1350 Copenhagen, Denmark..
    Simulation of dynamical interactions between soil freezing/thawing and salinization for improving water management in cold/arid agricultural region2019In: Geoderma, ISSN 0016-7061, E-ISSN 1872-6259, Vol. 338, p. 325-342Article in journal (Refereed)
    Abstract [en]

    In cold/arid agricultural regions seasonal freezing/thawing of soils can result in soil salinization in winter; therefore, it is crucial to understand the mechanisms behind soil salinization during winter for better water management in agriculture. In Hetao Irrigation District of Inner Mongolia, northern China, we used the CoupModel (version 5) considering dynamical impacts of salt on soil freezing point to simulate soil salt dynamics and soil freezing/thawing in three winters during 2012-2015. The simulated soil temperature at different depths was improved by 10% with respect to the Nash-Sutcliffe coefficient NSE R-2 when dynamical salt impact on freezing point was taken into accounted. Simulations revealed that ice coverage on soil surface as well as water stored in drainage ditches during winter cause more severe salinization in spring due to improper Al (Autumn Irrigation) practices combining poor drainage systems. A new Al practice with earlier irrigation date (i.e. 10 d earlier than 2012/2013 winter regulation), longer irrigation period (i.e. 7 d instead of 3 d), but with less irrigation water (reduced by 20% from 2012/2013 winter regulation) was then proposed. The new AI practice can control groundwater level and salt accumulation better during winters, Our results highlight the importance of combining detailed field irrigation tests with a process-based model accounting for interactions between soil freezing/thawing and salinization to improve water management efficiency in cold/arid agricultural regions.

  • 1158219.
    Wu, Nan
    et al.
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Wang, Bofei
    University of Gävle, Faculty of Engineering and Sustainable Development, Department of Electronics, Mathematics and Natural Sciences.
    Process and Analysis of Voice Signal by MATLAB2014Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Deliver message by voice is the most important, effective and common method of exchange information for mankind. Language is human specific features and human voice is commonly used tool which is also the important way to pass information to each other. The voice has large information capacity. So we can use modern method to study voice processing technology, so that people can easily transmit, store, access and apply the voice. In this thesis, we designed a collection system that can collect voice and use different filters to filter the noise. After filtering the noise, the voice will be more quality in mobile communication, radio, TV and so on. In this thesis we use Microsoft recorder to collect a voice, and then analyze its time-domain, the frequency spectrum and the characteristics of the voice signal. We use MATLAB‟s function to remove the noise which has been added to the voice, further use bilinear transformation method to design a filter which is based on Butterworth simulation and window function and then filter the voice signal which has been added noise. After that we compare the time-domain and frequency-domain of the original voice and noised voice, then playback the noised voice and de-noising voice and then compare the application of signal processing in FIR filter and IIR filter, especially in the perspectives of the signal filtering de-noising characteristics and applications. According to the comparison, we can determine which filter is the best.

  • 1158220.
    Wu, Nan
    et al.
    Ningxia Med Univ, Ningxia Key Lab Cerebrocranial Dis, Incubat Base Natl Key Lab, Ningxia, Peoples R China.;Ningxia Med Univ, Gen Hosp, Dept Neurosurg, Ningxia, Peoples R China..
    Wang, Feng
    Ningxia Med Univ, Ningxia Key Lab Cerebrocranial Dis, Incubat Base Natl Key Lab, Ningxia, Peoples R China.;Ningxia Med Univ, Gen Hosp, Dept Neurosurg, Ningxia, Peoples R China..
    Jin, Zhe
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Neuroscience, Physiology.
    Zhang, Zhen
    Ningxia Med Univ, Ningxia Key Lab Cerebrocranial Dis, Incubat Base Natl Key Lab, Ningxia, Peoples R China.;Ningxia Med Univ, Gen Hosp, Dept Neurosurg, Ningxia, Peoples R China..
    Wang, Lian-Kun
    Ningxia Med Univ, Ningxia Key Lab Cerebrocranial Dis, Incubat Base Natl Key Lab, Ningxia, Peoples R China.;Ningxia Med Univ, Gen Hosp, Dept Neurosurg, Ningxia, Peoples R China..
    Zhang, Chun
    Ningxia Med Univ, Ningxia Key Lab Cerebrocranial Dis, Incubat Base Natl Key Lab, Ningxia, Peoples R China.;Ningxia Med Univ, Gen Hosp, Dept Neurosurg, Ningxia, Peoples R China..
    Sun, Tao
    Ningxia Med Univ, Ningxia Key Lab Cerebrocranial Dis, Incubat Base Natl Key Lab, Ningxia, Peoples R China.;Ningxia Med Univ, Gen Hosp, Dept Neurosurg, Ningxia, Peoples R China..
    Effects of GABA(B) receptors in the insula on recognition memory observed with intellicage2017In: Behavioral and Brain Functions, ISSN 1744-9081, E-ISSN 1744-9081, Vol. 13, no 7Article in journal (Refereed)
    Abstract [en]

    Background: Insular function has gradually become a topic of intense study in cognitive research. Recognition memory is a commonly studied type of memory in memory research. GABA(B)R has been shown to be closely related to memory formation. In the present study, we used intellicage, which is a new intelligent behavioural test system, and a bilateral drug microinjection technique to inject into the bilateral insula, to examine the relationship between GABA(B)R and recognition memory. Methods: Male Sprague- Dawley rats were randomly divided into control, Sham, Nacl, baclofen and CGP35348 groups. Different testing procedures were employed using intellicage to detect changes in rat recognition memory. The expression of GABA(B)R (GB1, GB2) in the insula of rats was determined by immunofluorescence and western blotting at the protein level. In addition, the expression of GABA(B)R (GB1, GB2) was detected by RT-PCR at the mRNA level. Results: The results of the intellicage test showed that recognition memory was impaired in terms of position learning, punitive learning and punitive reversal learning by using baclofen and CGP35348. In position reversal learning, no significant differences were found in terms of cognitive memory ability between the control groups and the CGP and baclofen groups. Immunofluorescence data showed GABA(B)R (GB1, GB2) expression in the insula, while data from RTPCR and western blot analysis demonstrated that the relative expression of GB1 and GB2 was significantly increased in the baclofen group compared with the control groups. In the CGP35348 group, the expression of GB1 and GB2 was significantly decreased, but there was no significant difference in GB1 or GB2 expression in the control groups. Conclusions: GABA(B)R expression in the insula plays an important role in the formation of recognition memory in rats.

  • 1158221.
    Wu, Nanhua
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Ji, Xiaoyan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    An, Rong
    Herbert Gleiter Institute of Nanoscience, Nanjing University of Science & Technology.
    Liu, Chang
    College of Chemical Engineering, Nanjing Tech University, Nanjing .
    Lu, Xiaohua
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science. Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing .
    Generalized Gibbs free energy of confined nanoparticles2017In: AIChE Journal, ISSN 0001-1541, E-ISSN 1547-5905, Vol. 63, no 10, p. 4595-4603Article in journal (Refereed)
    Abstract [en]

    The nanoparticles generally show abnormal properties compared to those in the bulk phase, and they exhibit significant potential in various applications such as catalysis and energy conversion. However, the theoretical work for describing the properties of nanoparticles is limited with poor prediction capacity. In this work, the Gibbs free energy was studied, from both macroscope and microscope, predictive models were proposed to study the thermodynamic properties of nanoparticles with a generalized description of the Gibbs free energy considering the effects of surface-energy and the substrate contacted. The proposed model from the microscope was based on the corresponding states theory to describe the effect of the substrate on the Gibbs free energy of nanoparticles, in which the molecular parameter with a generalized constant was obtained from the melting point of metals due to sufficient experimental information. The comparison with the new measured experimental results proves the reliability of the model prediction

  • 1158222.
    Wu, Nanhua
    et al.
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Ji, Xiaoyan
    Luleå University of Technology, Department of Engineering Sciences and Mathematics, Energy Science.
    Xie, Wenlong
    China Petroleum Chemicals Kunshan Company.
    Liu, Chang
    State Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University.
    Feng, Xin
    State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing Tech University, Nanjing .
    Lu, Xiaohua
    Key Laboratory of Material and Chemical Engineering, Nanjing Tech University, Nanjing .
    Confinement Phenomenon Effect on the CO2 Absorption Working Capacity in Ionic Liquids Immobilized into Porous Solid Supports2017In: Langmuir, ISSN 0743-7463, E-ISSN 1520-5827, Vol. 33, no 42, p. 11719-11726Article in journal (Refereed)
    Abstract [en]

    In this work, the CO2 absorption working capacity and solubility in the ionic liquids immobilized into porous solid materials (substrates) was studied both experimentally and theoretically. The CO2 absorption working capacity in the immobilized ionic liquids was measured experimentally. It was found that the CO2 absorption working capacity and solubility increased up to 10 times compared to that in the bulk ionic liquids when the film thickness is nearly 2.5 nm in the [HMIm][NTf2] immobilized into the P25. Meanwhile, a new model was proposed to describe the Gibbs free energy of CO2 in the immobilized ionic liquids, and both macro- and micro-analyses of the CO2 solubility in the confined ionic liquids were conducted. The theoretical investigations reveal that the substrate has a crucial effect on the gas solubility in the ionic liquid immobilized into the substrates, and the model performance was approved with the consideration of substrate effect.

  • 1158223.
    Wu, Naomi
    Umeå University, Faculty of Social Sciences, Department of Psychology.
    A LONG-DISTANCE RELATIONSHIP: RECONNECTING HOTELS WITH THEIR GUESTS VIA INTUITIVE DESIGN2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Currently for travel planning, guests will research via hotel websites while still preferring to book through third-party sites, which leads to a disconnect between hotels and their guests. A chat widget artifact that is added onto the hotel’s website and linked through messaging applications was created by a start-up company, Bookboost, to bridge this gap. The current intuitiveness of the artifact and future improvements that may increase intuitiveness was investigated through a case study of user and expert analysis. 10 participants – 5 hotel staff users and 5 guest users – were sampled at hotel lobbies via systematic sampling and non-random sampling. Participants ranged in age from 18 to 65 years old, with 30% being millennials. Task analysis, an interview, and a questionnaire were used for user analysis. The researcher acted as an evaluator and examined the artifact for flaws and possible improvements using activity theory’s human-artifact model (HAM). Analyses suggest that current intuitiveness is fairly high, but there is room for improvement. There seems to be a difference between millennials and non-millennials, especially regarding the amount of time taken and preference for the artifact (versus more familiar methods for communicating with others). Interest and comfort in technology usage was a factor in intuitiveness. Generally, those more comfortable with technology had higher zone of proximal development (ZPD) scores. Improvements have been suggested that may increase artifact intuitiveness, although this was not tested due to the scope of the study. Future research can continue to examine if the suggested improvements have indeed increased intuitiveness in the artifact for users of all ages.

  • 1158224.
    Wu, Naomi
    Umeå University, Faculty of Science and Technology, Department of Computing Science.
    A long-distance relationship: Reconnecting hotels with their guests via intuitive design2018Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Currently for travel planning, guests will research via hotel websites while still preferring to book through third-party sites, which leads to a disconnect between hotels and their guests. A chat widget artifact that is added onto the hotel’s website and linked through messaging applications was created by a start-up company, Bookboost, to bridge this gap. The current intuitiveness of the artifact and future improvements that may increase intuitiveness was investigated through a case study of user and expert analysis. 10 participants – 5 hotel staff users and 5 guest users – were sampled at hotel lobbies via systematic sampling and non-random sampling. Participants ranged in age from 18 to 65 years old, with 30% being millennials. Task analysis, an interview, and a questionnaire were used for user analysis. The researcher acted as an evaluator and examined the artifact for flaws and possible improvements using activity theory’s human-artifact model (HAM). Analyses suggest that current intuitiveness is fairly high, but there is room for improvement. There seems to be a difference between millennials and non-millennials, especially regarding the amount of time taken and preference for the artifact (versus more familiar methods for communicating with others). Interest and comfort in technology usage was a factor in intuitiveness. Generally, those more comfortable with technology had higher zone of proximal development (ZPD) scores. Improvements have been suggested that may increase artifact intuitiveness, although this was not tested due to the scope of the study. Future research can continue to examine if the suggested improvements have indeed increased intuitiveness in the artifact for users of all ages.

  • 1158225.
    Wu, Naomi
    Umeå University, Faculty of Social Sciences, Department of Psychology.
    Sibling warmth as a correlate of youth self-esteem2019Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    During adolescence, self-systems and individual perceptions of the self are changing and heavily influenced by family relationships, which are generally the first and longest lasting connections individuals experience. Thus, to understand youth development, it is imperative to investigate the family context, wherein parent-youth relationships and sibling relationships impact one another. The current study examines the effect of a close sibling relationship on youth self-esteem above and beyond the effect of the mother-youth relationship. A cross-sectional study was employed on a sample of 434 families in the US, which all consisted of one mother and at least a pair of siblings. All three members of the family participating filled in an online survey. The target youth were between the 5th to 7th grades. Hierarchical multiple regression analyses find sibling warmth as a significant predictor for youth self-perception, but not for youth self-criticism. The present study shows the importance of considering not only the mother-youth relationship when analyzing youth self-system development, but also the sibling relationship.

  • 1158226.
    Wu, P
    et al.
    Uppsala University.
    Kazys, R
    Uppsala University.
    Stepinski, T
    Uppsala University.
    Analysis of the numerically implemented angular spectrum approach based on the evaluation of two-dimensional acoustic field .1.2. Response1997In: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, Vol. 101, no 6, p. 3804-3805Other (Other scientific)
  • 1158227.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Kazys, R
    Stepinski, T
    Analysis of the numerically implemented angular spectrum approach based on the evaluation of two-dimensional acoustic fields .1. Errors due to the discrete Fourier transform and discretization1996In: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, ISSN 0001-4966, Vol. 99, no 3, p. 1339-1348Article in journal (Refereed)
    Abstract [en]

    The numerically implemented angular spectrum approach (ASA) is investigated based on the evaluation of the 2-D fields radiated by striplike planar sources and I-D focusing linear-phased arrays with different aperture sizes and on the comparison with those

  • 1158228.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Kazys, R
    Stepinski, T
    Analysis of the numerically implemented angular spectrum approach based on the evaluation of two-dimensional acoustic fields .1. Errors due to the discrete Fourier transform and discretization (vol 99, pg 1339, 1996)1997In: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, ISSN 0001-4966, Vol. 101, no 4, p. 2395-2396Article in journal (Refereed)
  • 1158229.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Kazys, R
    Stepinski, T
    Analysis of the numerically implemented angular spectrum approach based on the evaluation of two-dimensional acoustic fields .2. Characteristics as a function of angular range1996In: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, ISSN 0001-4966, Vol. 99, no 3, p. 1349-1359Article in journal (Refereed)
    Abstract [en]

    The numerically implemented angular spectrum approach (ASA) is investigated in terms of the characteristics of the ASA as a function of angular range over which the angular spectrally decomposed plane waves are superimposed to construct an acoustic field

  • 1158230.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Kazys, R
    Stepinski, T
    Analysis of the numerically implemented angular spectrum approach based on the evaluation of two-dimensional acoustic fields .2. Characteristics as a function of angular range (vol 99, pg 1349, 1996)1997In: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, ISSN 0001-4966, Vol. 101, no 4, p. 2396-2396Article in journal (Refereed)
  • 1158231.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Kazys, R
    Stepinski, T
    Calculation of transient fields in immersed solids radiated by linear focusing arrays1995In: Proceedings of the 1995 IEEE Ultrasonic Symposium, Seattle, 1995, p. 993-997Conference paper (Other scientific)
  • 1158232.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Kazys, R
    Stepinski, T
    Optimal selection of parameters for the angular spectrum approach to numerically evaluate acoustic fields1997In: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, ISSN 0001-4966, Vol. 101, no 1, p. 125-134Article in journal (Refereed)
    Abstract [en]

    Optimal selection of parameters is presented for the angular spectrum approach (ASA) to the numerical calculation of acoustic fields radiated by planar transducers and linear arrays with and without focusing. The parameters include spatial sampling interv

  • 1158233.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Lingvall, F
    Stepinski, T
    Inspection of copper canisters for spent nuclear fuel by means of ultrasound; Electron beam weld evaluation, harmonic imaging, materials characterization and ultrasonic modeling2000Report (Other scientific)
  • 1158234.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    A spatial-impulse-response-based method for determining effective geometrical parameters for spherically focused transducers2002In: UltrasonicsArticle in journal (Refereed)
  • 1158235.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    A spatial-impulse-response-based method for determining effective geometrical parameters for spherically focused transducers2001In: UI'01, Ultrasonics International, Delft, Holland, 2001Conference paper (Refereed)
  • 1158236.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    An approach to calculating spatial impulse response of curved transducers: Linear arrays with cylindrically curved surfaces1999In: Joint EAA/Acoustical Society of America Meeting, Berlin, Germany, 1999Conference paper (Other scientific)
  • 1158237.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Angular space algorithm - a novel algorithm for the angular spectrum approach for axisymmetric transducers2001In: International Conference on Theoretical and Computational Acoustics, Beijing, China, 2001Conference paper (Refereed)
  • 1158238.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Detection of defects in materials characterized by large grain backscattering using K-distribution1998In: 1st International Conference on NDE in Relation to Structural Integrity for Nuclear and Pressurized Components, Amsterdam, Holland, 1998Conference paper (Other scientific)
  • 1158239.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Elastic fields in immersed isotropic solids from phased arrays: Time harmonic case1998In: RESEARCH IN NONDESTRUCTIVE EVALUATION, ISSN 0934-9847, Vol. 10, no 4, p. 185-204Article in journal (Other scientific)
    Abstract [en]

    Elastic fields in immersed isotropic solids from phased arrays are investigated theoretically in both far- and near-field regions for a variety of beams. The angular spectrum approach (ASA) is used here as a tool to evaluate both far-field beam patterns a

  • 1158240.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Extension of the angular spectrum approach to curved radiators1999In: JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA, ISSN 0001-4966, Vol. 105, no 5, p. 2618-2627Article in journal (Refereed)
    Abstract [en]

    The angular spectrum approach (ASA) is conventionally applied to the evaluation of acoustic fields from planar radiators because it is usually based on the 2-D Fourier transform (or the zero-order Hankel transform in the axisymmetrical case) which is impl

  • 1158241.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Inspection of copper canisters for spent nuclear fuel by means of ultrasonic array system: Evaluation of electronic beam welds, modeling and material characterization1999Report (Other scientific)
  • 1158242.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Inspection of copper canisters for spent nuclear fuel by means of ultrasonic array system: Modeling, defect detection and grain noise estimation1998Report (Other scientific)
  • 1158243.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Investigation of effective geometrical parameters for a pulse-echo linear array with cylindrical curved focusing surface1999In: Joint EAA/Acoustical Society of America Meeting, Berlin, Germany, 1999Conference paper (Other scientific)
  • 1158244.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Quantitative estimation of ultrasonic attenuation in a solid in the immersion case with correction of diffraction effects1999In: UI'99, Ultrasonic International, Copenhagen, Denmark, 1999Conference paper (Other scientific)
  • 1158245.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Quantitative estimation of ultrasonic attenuation in a solid in the immersion case with correction of diffraction effects2000In: ULTRASONICS, ISSN 0041-624X, Vol. 38, no 1-8, p. 481-485Article in journal (Refereed)
    Abstract [en]

    This paper presents a method of diffraction correction for the log-spectral difference method to estimate quantitatively attenuation of a solid in the immersion case. The correction method is established based on the angular spectrum approach that is used

  • 1158246.
    Wu, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. SIGNALS AND SYSTEMS.
    Stepinski, T
    Spatial impulse response method for predicting pulse-echo fields from a linear array with cylindrically concave surface1999In: IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL, ISSN 0885-3010, Vol. 46, no 5, p. 1283-1297Article in journal (Refereed)
    Abstract [en]

    This paper is intended to apply the spatial impulse response method (SIRM) to predict the pulsed-echo fields radiated by a linear array with a cylindrically concave surface. To this end, an approach to computing the spatial impulse response (SIR) of a cyl

  • 1158247. Wu, P
    et al.
    Tatsumi, T
    Terasaki, Osamu
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
    He, M
    Fan, W
    Liu, Y
    Wang, Y
    Wu, L
    Wang, L
    Ruan, Juanfang
    Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
    Methodology for synthesizing crystalline metallosilicates with expanded pore windows through molecular alkoxysilylation of zeolitic lamellar precursors2008In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 130, no 26, p. 8178-8187Article in journal (Refereed)
    Abstract [en]

    Postalkoxysilylation with diethoxydimethylsilane has been carried out on the zeolitic lamellar precursors of various topologies such as MWW, FER, CDO and MCM-47 aiming to construct new crystalline structures with expanded pore apertures between the layers. The silylation process and the crystalline and pore structures of the resulting materials have been investigated with the techniques of XRD, IR, 13C and 29Si MAS NMR, ICP, SEM, HRTEM, elemental analyses, and N2 adsorption. In contrast to forming known three-dimensional zeolite structures after direct calcination of the lamellar precursors, the silylation led to new crystalline structures with opener pores, as evidenced by the shift of layer-related diffractions to the lower-angle region in XRD patterns and the enlarged interlayer pores found by HRTEM images. After optimizing the treatment conditions, particularly the amount of silane agent, a maximum and homogeneous silylation was realized, which guaranteed the phase purity in interlayer expanded zeolites. The expanded structures were well preserved after calcination at 823 K or reflux in water for 1 to 2 weeks, indicating a high thermal stability and also a hydrothermal stability. The interlayer expanded zeolites prepared from the metallosilicate precursors of MWW topology exhibited higher catalytic activities in the redox and solid acid-catalyzed reactions of bulky molecules than that of their counterparts with conventional MWW topology.

  • 1158248.
    Wu, Pei-Hsuan
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
    Mäkie, Peter
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
    Odén, Magnus
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.
    Björk, Emma
    Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering. Univ Ulm, Germany.
    Growth and Functionalization of Particle-Based Mesoporous Silica Films and Their Usage in Catalysis2019In: NANOMATERIALS, ISSN 2079-4991, Vol. 9, no 4, article id 562Article in journal (Refereed)
    Abstract [en]

    We report the formation of mesoporous films consisting of SBA-15 particles grown directly onto substrates and their usage as catalysts in esterification of acetic acid and ethanol. The film thickness was altered between 80 nm and 750 nm by adding NH4F to the synthesis solution. The salt also affects the formation rate of the particles, and substrates must be added during the formation of the siliceous network in the solution. Various substrate functionalizations were tested and hydrophobic substrates are required for a successful film growth. We show that large surfaces (amp;gt; 75 cm(2)), as well as 3D substrates, can be homogenously coated. Further, the films were functionalized, either with acetic acid through co-condensation, or by coating the films with a thin carbon layer through exposure to furfuryl alcohol fumes followed by carbonization and sulfonation with H2SO4. The carbon-coated film was shown to be an efficient catalyst in the esterification reaction with acetic acid and ethanol. Due to the short, accessible mesopores, chemical variability, and possibility to homogenously cover large, rough surfaces. the films have a large potential for usage in various applications such as catalysis, sensing, and drug delivery.

  • 1158249.
    Wu, Peng
    KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment.
    Completing the Circuit: Connecting and Transforming Hovsjö and Måsnaren2018Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
    Abstract [en]

    My project will focus on the neighborhood of Hovsjö in the city of Södertälje, located in the south of Stockholm county. Through this project I will examine aspects of this neighborhood’s isolation from the rest of the city. Using a mix of quantitative and qualitative approaches, I explore the nature of this isolation and question how much of this segregation is a result of its spatial orientation, as well as various cultural and social factors. As Hovsjö is an area with a high concentration of members of the Assyrian/Syriac immigrant community, it has natural affinities to surrounding immigrant neighborhoods, but its spatial arrangement inhibits this affinity. Furthermore, Hovsjö is also isolated from its surrounding environs; I will explain how it is cut off from its immediate neighbor to its south and west, Lake Måsnaren, a nature area with many recreational amenities. I show in my research that the lake is not well used by the residents of Hovsjö, despite their proximity to it. Investigating the physical structure and the layout of the area between Hovsjö and Måsnaren, I will show that this separation is due to physical factors as well as an inappropriate programming of the green spaces. Using this research, I will to suggest a series of interventions with will break down both types of isolation and thereby fully integrate Lake Måsnaren into Hovsjö, and Hovsjö into the rest of Södertälje. This integration will lead to the creation new cultural landmarks for both the city of Södertälje as a whole as well as its Assyrian/Syriac immigrant community in particular, and the results will link Hovsjö more deeply into Södertälje’s urban fabric and end its isolation.

  • 1158250. Wu, Peng
    Incident reporting systems in process industries in Sweden2003Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Incident reporting system has been proved to be very effective method for monitoring safety performance and reducing accidents. When carried out effectively, the process generates invaluable safety data from which an organization can learn about past mistakes and take steps to prevent future recurrence. But with no standards, and also very little guidance from publicly available literature, there are lot of differences among existing incident reporting systems in the different process industries in Sweden. This study analyzed and compared the incident reporting systems of 8 sampled process industries in Sweden from the perspectives of an established criterion for designing and implementing efficient incident reporting systems through information gathered from mail survey, using questionnaire. Analysis of the results showed that none of the 8 companies met all the criteria required of an efficient incident reporting system. The incident reporting systems of each of the 8 companies met the requirements in one aspect or the other. One (1) company was found to meet most aspects of the criteria, (i.e. 5 aspects). These include: non provision of discipline: training: confidentiality: good feedback: and completion of a form by more than one person). Despite this, it could still not be proved that the incident reporting system of this company is the most efficient one to prevent accidents. The reason being that the company did not meet the entire requirement, and there were some aspects of the criteria it did not meet, but which were met by the other 7 companies. The research identified the need for further research which could lead to establish a unified and most efficient incident reporting system for the process industries in Sweden.

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