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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第1期9卷 113-117页

作者： Xian-kai WAN hui-xiang SHI Xue-quan ZOU Peng GE da-hui wang Institute of Environmental Engineering Zhejiang University Hangzhou 310027 China

Nitrogen doping of activated carbon （AC） was performed by annealing both in ammonia and nitric oxide, and the activities of the modified carbons for NO reduction were studied in the presence of oxygen. Results show that nitrogen atoms were incorporated into the carbons, mostly in the form of pyridinic nitrogen or pyridonic nitrogen. The effect of nitrogen doping on the activities of the carbons can be ignored when oxygen is absent, but the doped carbons show desirable activities in the low temperature regime （≤500 ℃） when oxygen is present. The role of the surface nitrogen species is suggested to promote the formation of NO2 in the presence of oxygen, and NO2 can facilitate decomposition of the surface oxygen species in the low temperature regime

关键词： Activated carbon (AC) Nitric oxide Doping Reduction

Degradation Mechanism of Cationic Red X-GRL by Ozonation

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Chinese Chemical Letters 2003年第12期14卷 1309-1312页

作者： Wei Rong ZHAO Xin Hua XU hui Xiang SHI da hui wang Department of Environmental Engineering Zhejiang UniversityHangzhou 310027

The degradation mechanism of Cationic Red X-GRL was investigated when the intermediates, the nitrate ion and the pH were analyzed in the ozonation. The degradation of the Cationic Red X-GRL includes the de-auxochrome stage, the decolour stage, and the decomposition of fragment stage. During the degradation process, among the six nitrogen atoms of Cationic Red X-GRL, one is transferred into a nitrate ion, one becomes the form of an amine compound, and the rest four are transformed into two molecules of nitrogen. In the course of the ozonation of Cationic Red X-GRL, the direct attack of ozone is the main decolour effect.

关键词： Ozonation cationic Red X-GRL mechanism intermediates dye decolourization.

Review:Mitochondrial functions on oocytes and preimplantation embryos

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2009年第7期10卷 483-492页

作者： Li-ya wang da-hui wang Xiang-yang ZOU Chen-ming XU Department of Biotechnology Dalian Medical University Dalian 116044 China The Sperm Laboratory Institute of Cell Biology and Genetics College of Life Sciences Zhejiang University Hangzhou 310058 China Department of Reproductive Endocrinology Women's Hospital School of Medicine Zhejiang University Hangzhou 310006 China

Oocyte quality has long been considered as a main limiting factor for in vitro fertilization （IVF）. In the past decade, extensive observations demonstrated that the mitochondrion plays a vital role in the oocyte cytoplasm, for it can provide adenosine triphosphate （ATP） for fertilization and preimplantation embryo development and also act as stores of intracellular calcium and proapoptotic factors. During the oocyte maturation, mitochondria are characterized by distinct changes of their distribution pattern from being homogeneous to heterogeneous, which is correlated with the cumulus apoptosis. Oocyte quality decreases with the increasing maternal age. Recent studies have shown that low quality oocytes have some age-related dysfunctions, which include the decrease in mitochondrial membrane potential, increase of mitochondrial DNA （mtDNA） damages, chromosomal aneuploidies, the incidence of apoptosis, and changes in mitochoncLrial gene expression. All these dysfunctions may cause a high level of de- velopmental retardation and arrest of preimplantation embryos. It has been suggested that these mitochondrial changes may arise from excessive reactive oxygen species （ROS） that is closely associated with the oxidative energy production or calcium overload, which may trigger permeability transition pore opening and subsequent apoptosis. Therefore, mitochondria can be seen as signs for oocyte quality evaluation, and it is possible that the oocyte quality can be improved by enhancing the physical function of mitochondria. Here we reviewed recent advances in mitochondrial functions on oocytes.

关键词： Mitochondria Oocyte Preimplantation embryo

Catalytic Dechlorination of Chlorobenzene in Water by Pd/Fe System

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Chinese Chemical Letters 2003年第7期14卷 700-703页

作者： Xin Hua XU Hong Yi ZHOU da hui wang Department of Environmental Engineering Zhejiang UniversityHangzhou 310027

Chlorobenzene was dechlorinated by Pd/Fe bimetallic system in water through catalytic reduction. The dechlorination rate increases with increase of bulk loading of Pd due to the increase of both the surface loading of the Pd and the total surface area. For conditions with 0.005% Pd/Fe, 45% dechlorination efficiency was achieved within 5 h. The dechlorinated reaction is believed to take place on the bimetal surface in a pseudo-first-order reaction, with the rate constant being 0.0043 min-1.

关键词： Reductive dechlorination catalytic Pd/Fe chlorobenzene.

Synergetic Effects of UV/Fe^(3+) Combined with Electrocatalysis for p-Nitrophenol Degradation

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Chinese Chemical Letters 2002年第4期13卷 375-378页

作者： Ming Hua ZHOU Zu Cheng WU da hui wang Department of Environmental Science and Engineering Zhejiang UniversityHangzhou 310027

Synergetic effects for p-nitrophenol degradation were observed in the combination of two-advanced oxidation processes, UV/Fe3+ and electrocatalysis. The enhancement of removal rate for p-nitrophenol and COD was around 123% and 278%, respectively. The possible contributions for the synergetic effects were the electrochemically regeneration of ferric ion and the role of the oxygen that formed on the anode.

关键词： UV/Fe3+ electrocatalysis synergetic effect p-nitrophenol degradation AOPs.

Manganese removal from the Qiantang River source water by pre-oxidation:A case study

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第3期10卷 450-457页

作者： Jian-wen ZHU Zhen ZHANG Xiao-min LI Xin-hua XU da-hui wang Department of Environmental Engineering Zhejiang University Hangzhou 310027 China Hangzhou Water Group Company Ltd. Hangzhou 310009 China School of Bioscienee Taizhou University Linhai 317000 China

We evaluated several different pre-oxidation treatments, namely the introduction of either potassium permanganate (KMnO4), chlorine (Cl2), or both to remove manganese (Mn) from the Qiantang River source water. Our results showed that Mn removal percentages were 12.7%, 71.0%, 17.4% and 58.7% when none of the oxidants, KMnO4 only, Cl2 only, or both oxidants were added, respectively. Furthermore, a field study showed that when the available Mn concentration in the source water was 0.14 mg/L, it could be reduced to less than 0.05 mg/L when a solution of KMnO4 (0.47 mg/L) was added as the oxidant.

关键词： Pre-oxidation Potassium permanganate (KMnO2) Chlorine (Cl2) Manganese (Mn) removal

Decomposition of dimethyl sulfide in a wire-cylinder pulse corona reactor

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第1期10卷 127-132页

作者： Jian-tao YANG Yao SHI Jie CHEN Qing-fa SU da-hui wang Jing CAO Department of Environmental Science Zhejiang University Hangzhou 310028 China

Decomposition of dimethyl sulfide (DMS) in air was investigated experimentally by using a wire-cylinder dielectric barrier discharge (DBD) reactor at room temperature and atmospheric pressure.A new type of high pulse voltage source with a thyratron switch and a Blumlein pulse-forming network (BPFN) was adopted in our *** maximum power output of the pulse voltage source and the maximum peak voltage were 1kW and 100kV,*** important parameters affecting odor decomposition,including peak voltage,pulse frequency,gas flow rate,initial concentration,and humidity,which influenced the removal efficiency,were *** results showed that DMS could be treated effectively and almost a 100% removal efficiency was achieved at the conditions with an initial concentration of 832mg/m3 and a gas flow rate of 1000ml/*** boosts the removal efficiency and improves the energy yield (EY) *** EY of 832mg/m3 DMS was 2.87mg/kJ when the relative humidity was above 30%.In the case of DMS removal,the ozone and nitrogen oxides were observed in the exhaust *** carbon and sulfur elements of DMS were mainly converted to carbon dioxide,carbon monoxide and sulfur ***,sulfur was discovered in the *** to the results,the optimization design for the reactor and the matching of high pulse voltage source can be reckoned.

关键词： Pulse corona discharge Blumlein pulse-forming network (BPFN) Decomposition Dimenthyl sulfide (DMS) Specific energy density Energy yield (EY)

Local Hamilton type Gradient Estimates and Harnack Inequalities for Nonlinear Parabolic Equations on Riemannian Manifolds

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 539-546页

作者： Wen wang da-peng XIE hui ZHOU School of Mathematics and Statistics Hefei Normal UniversityHefei 230601China

In this paper,we prove a local Hamilton type gradient estimate for positive solution of the nonlinear parabolic equation ut(x,t)=Δu(x,t)+au(x,t) ln u(x,t)+bu^(α)(x,t),on M×(-∞,∞) with α∈R,where a and b are *** ... 详细信息

关键词： nonlinear parabolic equation gradient estimate Harnack inequality

Variations and future projections of glacial discharge of Urumqi River Headwaters,eastern Tien Shan(1980s-2017)

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Advances in Climate Change Research 2024年第3期15卷 537-546页

作者： hui ZHANG Fei-Teng wang Ping ZHOU Yi-da XIE State Key Laboratory of Cryospheric Science Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Key Laboratory of Cryospheric Science and Frozen Soil Engineering Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

To address data scarcity on long-term glacial discharge and inadequacies in simulating and predicting hydrological processes in the Tien Shan,this study analysed the observed discharge at multiple timescales over 1980se2017 and projected changes within a representative glacierized high-mountain region:eastern Tien Shan,Central *** processes were simulated to predict changes under four future scenarios(SSP1,SSP2,SSP3,and SSP5)using a classical hydrological model coupled with a glacier dynamics *** rates at annual,monthly(June,July,August)and daily timescales were obtained from two hydrological gauges:Urumqi Glacier No.1 hydrological station(UGH)and Zongkong station(ZK).Overall,annual and summer discharge increased significantly(p<0.05)at both stations over the study *** intra-annual variations mainly resulted from differences in their recharge *** simulations show that a tipping point in annual discharge at UGH may occur between 2018 and 2024 under the four SSPs *** discharge is predicted to cease earlier at ZK than at *** relates to glacier type and size,suggesting basins with heavily developed small glaciers will reach peak discharge sooner,resulting in an earlier freshwater supply *** findings serve as a reference for research into glacial runoff in Central Asia and provide a decision-making basis for planning local water-resource projects.

关键词： Observed glacial discharge Temporal variations Urumqi River Headwaters Eastern Tien Shan Simulation and projection

Controlling molecular assembly on time scale:Time-dependent multicolor fluorescence for information encryption

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Chinese Chemical Letters 2024年第7期35卷 336-340页

作者： Zixi Zou Jingyuan wang Yian Sun Qian wang da-hui Qu Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China

Dynamic assembly on time scale is common in biological systems but rare for artificial materials,especially for smart luminescent *** molecular assembly in a spatio-temporal manner and resulting in white-light-including multicolor fluorescence with time-dynamic features remains ***,controlling molecular assembly on time scale is achieved by integrating a pH-responsive motif to a transient alkaline solution which is fabricated by activators(NaOH)and deactivators(esters),leading to automatic assembly on time scale and time-dependent multicolor fluorescence changing from blue to white and *** kinetics of the assembly process is dependent on the ester hydrolysis process,which can be controlled by varying ester concentrations,temperature,initial pH,stirring rate and ester *** dynamic fluorescent system can be further developed for intelligent fluorescent materials such as fluorescent ink,three-dimension(3D)codes and even four-dimension(4D)codes,exhibiting a promising potential for information encryption.

关键词： Supramolecular chemistry Multicolor fluorescence White light emission Time-dependent fluorescence Information encryption