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International Journal of Digital Earth 2020年第10期13卷 1135-1150页

作者： Gianna Hartung Arzu Çöltekin Department of Geography University of ZurichZurichSwitzerland fhnw university of applied sciences and arts northwestern ZurichSwitzerland

Identifying land forms and land cover classes are important tasks in image ***,a phenomenon called terrain reversal effect(TRE)causes an inverted perception of 3D *** this inversion occurs,valleys appear as ridges and vice *** the TRE can severely impair the ability to identify 3D land forms,‘correcting’for the TRE in imagery can introduce new ***,one of most commonly-proposed methods–shaded relief map(SRM)overlay–appears to impair the ability to identify land cover *** this paper,we report a comparative empirical evaluation of an SRM overlay solution,and its‘enhanced’versions supported by various other cues(stereopsis,motion,labels).In response to the different solutions,we measure the effectiveness,efficiency,confidence and preferences of our participants in land form and land cover identification *** examined methods significantly improve the ability to detect land forms accurately,but they also impair the ability to identify the land cover classes to different ***,participants’visualization preferences contradict their performance with them,calling for reflection on the visual effects of the applied correction *** on the study,recommendations concerning the correction of the TRE are drawn,and gaps are identified.

关键词： Terrain reversal effect satellite images correction methods shaded relief map stereoscopy motion

Quantitative data graphics in 3D desktop-based virtual environments-an evaluation

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International Journal of Digital Earth 2015年第8期8卷 623-639页

作者： Susanne Bleisch Jason Dykes Geomatics Engineering FHNW University of Applied Sciences and Arts Northwestern SwitzerlandMuttenzSwitzerland giCentre City University LondonLondonUK

3D desktop-based virtual environments provide a means for displaying quantitative data in *** that are inherently spatial in three dimensions may benefit from visual exploration and analysis in relation to the environment in which they were collected and to which they *** empirically evaluate how effectively and efficiently such data can be visually analyzed in relation to location and landform in 3D versus 2D *** two experiments,participants performed visual analysis tasks in 2D and 3D visualizations and reported insights and their confidence in *** results showed only small differences between the 2D and 3D visualizations in the performance measures that we evaluated:task completion time,confidence,complexity,and insight ***,we found differences for different datasets and settings suggesting that 3D visualizations or 2D representations,respectively,may be more or less useful for particular datasets and contexts.

关键词： 3D geovisualization quantitative data graphics visual data analysis empirical evaluation

Preparation of a novel chelating resin for the removal of Ni^(2+)from water

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Chinese Chemical Letters 2014年第2期25卷 265-268页

作者： Yuan-Hui Peng Jin-Nan Wang Xin Yang Cheng Cheng Thomas Wintgens State Key Laboratory of Pollution Control and Resource Reuse ε School of the Environment university of applied sciences northwestern Switzerland(fhnw)

A new chelating resin DVB-MA-HDA modified with hydroxamic acid groups was prepared for the fast removal of Ni2＋ from water. SEM, BET, elemental analysis, FT-IR spectroscopy and XPS were used to characterize this new adsorbent. Batch adsorption experiment indicated that the equilibrium adsorption capacity of DVB-MA-HD for Ni2＋ was more than 130mg/g, and the adsorption isotherm can be well fitted by the Langmuir model. The adsorption kinetic curve indicates that more than 60% of the adsorption amount of Ni2＋ at equilibrium occurred within the initial 20 rain. 0.1 mol/L EDTA solution could desorb Ni2＋ from DVB-MA-HDA effectively.

关键词： jChelating resin Adsorption Ni2+

A visual analytics design for studying rhythm patterns from human daily movement data

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Visual Informatics 2017年第2期1卷 81-91页

作者： Wei Zeng Chi-Wing Fu Stefan Müller Arisona Simon Schubiger Remo Burkhard Kwan-Liu Ma Future Cities Laboratory ETH ZurichSwitzerland The Chinese university of Hong Kong Hong Kong university of applied sciences and arts northwestern Switzerland fhnw Switzerland university of California-Davis United States

Human’s daily movements exhibit high regularity in a space-time context that typically forms circadian *** the rhythms for human daily movements is of high interest to a variety of parties from urban planners,transportation analysts,to business *** this paper,we present an interactive visual analytics design for understanding and utilizing data collected from tracking human’s *** resulting system identifies and visually presents frequent human movement rhythms to support interactive exploration and analysis of the data over space and *** studies using real-world human movement data,including massive urban public transportation data in Singapore and the MIT reality mining dataset,and interviews with transportation researches were conducted to demonstrate the effectiveness and usefulness of our system.

关键词： Movement rhythm Event sequence Visual analytics

Lévy noise induced stochastic resonance in an FHN model

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Science China(Technological sciences) 2016年第3期59卷 371-375页

作者： WANG ZhanQing XU Yong YANG Hui Department of applied Mathematics Northwestern Polytechnical University Department of Life sciences Northwestern Polytechnical University

This paper aims to investigate the stochastic resonance （SR） in an FitzHugh-Nagumo （FHN） model with an additive LEvy noise numerically. The non-Gaussian LEvy noise is a kind of general random noise which is different from the usual Gaussian noise, and it has small fluctuations with the unpredictable jumps to describe the random fluctuations in an FHN model. SR is determined by the signal-to-noise ratio （SNR）, and the numerical simulation results show the occurrence of the SR phenomena in the given FHN system. The influence of various parameters of the LEvy noise and the FHN model on the SR will be exam- ined, and some mechanisms of the LEvy noise-induced SR are presented which are different from those of the Gaussian noise.

关键词： Levy noise stochastic resonance signal-to-noise ratio FHN model

Invariant Sets and Exact Solutions to Nonlinear Diffusion Equations with x-Dependent Convection and Absorption

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Communications in Theoretical Physics 2008年第10期50卷 821-826页

作者： JIA Hua-Bing XU Wei Department of applied Mathematics Northwestern Polytechnical University Xi＇an 710072 China Department of Matheinatics Baoji University of Arts and Sciences Baoji 721013 China

In this paper, we introduce a new invariant set Eo={u：ux=f＇（x）F（u）＋ε[g＇（x）-f＇（x）g（x）]F（u）×exp（-∫^u1/F（z）dz）}where f and g are some smooth functions of x, ε is a constant, and F is a smooth function to be determined. The invariant sets and exact sohltions to nonlinear diffusion equation ut = （ D（u）ux）x ＋ Q（x, u）ux ＋ P（x, u）, are discussed. It is shown that there exist several classes of solutions to the equation that belong to the invariant set Eo.

关键词： invariant set exact solution nonlinear diffusion equations rotation group scaling group

Localized,non-viral delivery of nucleic acids:Opportunities,challenges and current strategies

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Asian Journal of Pharmaceutical sciences 2015年第3期10卷 159-175页

作者： Oliver Germershaus Kira Nultsch Institute for Pharma Technology School of Life SciencesUniversity of Applied Sciences and Arts Northwestern SwitzerlandGründenstrasse 40CH 4132MuttenzSwitzerland

Localized delivery of drugs is an emerging field both with regards to drug delivery during disease as well as in tissue *** significant achievements made in the last decades,the efficient delivery of proteins and peptides remains challenging,especially in cases requiring long-term release of proteins after *** localized delivery of nucleic acids(NA)represents an interesting alternative due to higher physicochemical stability of NA,increased efficiency by harnessing cells as bioreactors for the production of required proteins and improved versatility with regards to expression of specific proteins through plasmid DNA or repression of gene products through ***,unlike most proteins and peptides,NA must be delivered to the cytoplasm or nucleus to be efficacious,resulting in significant delivery *** herein describe frequently used non-viral vectors for the delivery of NA including polyplexes,lipoplexes and lipopolyplexes and summarize recent developments in the field of nucleic acid delivery systems for local application based on hydrogels,solid scaffolds and physical delivery *** challenges associated with the different approaches are identified and options to address these challenges are discussed.

关键词： Gene delivery Topical application Tissue engineering Controlled release SiRNA DNA

Second-order two-scale computations for conductive radiative heat transfer problem in periodic porous materials

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Chinese Physics B 2014年第3期23卷 91-98页

作者：杨志强崔俊芝李博文 Department of applied Mathematics Northwestern Polytechnical University LSEC ICMSEC Academy of Mathematics and Systems Sciences Chinese Academy of Sciences

In this paper, a kind of second-order two-scale （SOTS） computation is developed for conductive-radiative heat trans- fer problem in periodic porous materials. First of all, by the asymptotic expansion of the temperature field, the cell problem, homogenization problem, and second-order correctors are obtained successively. Then, the corresponding finite element al- gorithms are proposed. Finally, some numerical results are presented and compared with theoretical results. The numerical results of the proposed algorithm conform with those of the FE algorithm well, demonstrating the accuracy of the present method and its potential applications in thermal engineering of porous materials.

关键词： second-order two-scale (SOTS) computations periodic porous materials conductive-radiativeheat transfer

Preparation of Close-Packed Silver Nanoparticles on Graphene to Improve the Enzyme Immobilization and Electron Transfer at Electrode in Glucose/O2 Biofuel Cell

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Chinese Journal of Chemistry 2017年第7期35卷 1098-1108页

作者： Fengjin Qu Xiaoyan Ma Yuchen Hui Fang Chen Yan Gao Department of applied Chemistry School of Natural and Applied Sciences Northwestern Polytechnical University Xi'an Shaanxi 710129 China

In this study, chemical reduced graphene-silver nanoparticles hybrid （AgNPs@CR-GO） with close-packed AgNPs structure was used as a conductive matrix to adsorb enzyme and facilitate the electron transfer between im- mobilized enzyme and electrode. A facile route to prepare AgNPs@CR-GO was designed involving in β-cyclodextrin （β-CD） as reducing and stabilizing agent. The morphologies of AgNPs were regulated and controlled by various experimental factors. To fabricate the bioelectrode, AgNPs@CR-GO was modified on glassy carbon electrode followed by immobilization of glucose oxidase （GOx） or laccase. It was demonstrated by electrochemical testing that the electrode with close-packed AgNPs provided high GOx loading （Г=4.80 × 10^- l0 mol·cm^-2） and fast electron transfer rate （ks=5.76 s^-1）. By employing GOx based-electrode as anode and laccase based-electrode as cathode, the assembled enzymatic biofuel cell exhibited a maximum power density of 77.437 μW·cm^-2 and an open-circuit voltage of 0.705 V.

关键词： biofuel cell enzyme graphene silver nanoparticle β-cyclodextrin

Effect of Zn Doping on Transport Properties of La_(2/3)Sr_(1/3)Mn_(1-x)Zn_xO_3 Films

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Journal of Rare Earths 2007年第6期25卷 734-738页

作者：赵省贵陈长乐金克新 Department of applied Physics Northwestern Polytechnical University Department of Basic sciences Xi'an University of Science and Technology

La2/3 Sr1/3 Mn1-x ZnxO3films （x =0.05, 0.1,0.3, and 0.5） were prepared using magnetron sputtering method, and the effect of Zn doping on transport properties of the films was studied. An analysis of X-ray diffraction showed that the main phase of the bulk target was orthorhombic and the films had better epitaxial character. It was found that the films with x =0.05 and x =0.1 exhibited typical insulator-metal transition. No transition of the films with x≥0.3 was observed and the dominant transport was variable-range hopping due to observable secondary phase ZnO. These could be attributed to the Zn doping effect on manganites.

关键词： manganites thin film transport properties double exchange interaction rare earths