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Interplay between Microscopic Structures and Macroscopic Viscoelastic Properties of Polyampholyte Gels

Chinese Journal of Polymer Science 2024年第9期42卷 1360-1367,I0008页

作者： you-Cai xue Yi-Ming Yang Di Jia Beijing National Laboratory for Molecular Sciences Laboratory of Polymer Physics and ChemistryInstitute of ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100049China

Polyampholyte gels,which have hierarchical structures,exhibit excellent self-healing properties and have great promise for biomaterials and *** investigated the relationship between microscopic structures and macroscopic viscoelastic properties of polyampholyte gels and found three factors influencing their viscoelastic properties,including the chemical crosslinking bonds,topological entanglements controlled by monomer concentration,and the ionic *** strength plays a major role on the strength of ionic bonds.A crossover point of elastic modulus and loss modulus was observed in the dynamic frequency sweeps at low monomer concentration or low chemical crosslinking density for gels with intermediate strength of ionic *** solid-liquid transition signaled by the crossover point is a typical feature of dynamic associated gels,representing the dynamical association-dissociation of the ionic bonds and full relaxation of the topological entanglements in the gel *** the crossover point disappears when the ionic bonds are too weak or too strong to form“permanent”***,in the non-linear yielding measurement,gels with intermediate strength of the ionic bonds are ductile and yield at very large shear strain due to the self-healing properties and the dynamic association-dissociation of the ionic *** the self-healing properties disappear when the ionic bond strength is too weak or too *** work reveals the mechanism of how the dynamic association-dissociation of ionic bonds influences both the linear and non-linear viscoelastic properties of the polyampholyte gels.

关键词： Polyampholyte gel Ionic bond Topological entanglement Self-healing Hierarchical structure

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ANALYSIS OF EDL EFFECTS ON THE FLOW AND FLOW STABILITY IN MICROCHANNELS

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Journal of Hydrodynamics 2010年第5期22卷 725-731页

作者： you xue-yi GUO Li-xiang School of Environmental Science and Engineering Tianjin University 300072 Tianjin China

The effects of the Electrical Double Layer （EDL） on the liquid mean flow and the flow stability in microchannels are investigated by solving the Poisson-Boltzmann equation. The models of the traditional streaming Electrical Current Balance （ECB） and the newly introduced streaming Electrical Current Density Balance （ECDB） are applied to determine the electrical streaming current. The numerical results show that the electrical streaming current backflow in the ECB model near the wall can be removed by using the ECDB model, which is suitable to study the effects of the EDL on the mean flow and the flow stability in microchannels. The flow is found more unstable if the ECDB model is applied.

关键词： electrical double layer Poisson-Boltzmann equation electrical streaming current balance flow stability microchan

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Photochemically enhanced degradation of phenol using heterogeneous Fenton-type catalysts

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Journal of Environmental Sciences 2003年第3期15卷 351-355页

作者： HE Feng SHEN xue-you LEI Le-cheng Department of Environmental Engineering Zhejiang UniversityHangzhou 310027China.

The degradation of phenol was carried out using heterogeneous Fenton-type catalysts in the presence of H_2O_2 and UV. Catalysts were prepared by exchanging and immobilizing Fe 2+ in zeolite 13X, silica gel or Al_2O_3. The concentration of phenol solution was 100 mg/L. The amount of H_2O_2 added was the stoichiometric amount of H_2O_2 required for the total oxidation of phenol. Under the irradiation of medium pressure light (300 W) phenol was mineralized within 1 h in the presence of Fe 2+/zeolite 13X. The COD removal rate was enhanced in the presence of Fe 2+/zeolite 13X compared to that of Fe 2+/silica gel or Fe 2+/Al_2O_3. Analogous homogenous photo-Fenton reaction with equivalent Fe 2+ was also carried out to evaluate the catalysis efficiency of Fe 2+/zeolite 13X. Results showed that the COD removal rate was near to that of homogeneous Fenton, while heterogeneous Fe 2+/zeolite 13X catalyst could be recycled.

关键词： phenol degradation photo-Fenton process heterogeneous Fenton Fe^(2+)/zeolite

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Patterns of human-wildlife conflict and compensation practices around Daxueshan Nature Reserve, China

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Zoological Research 2018年第6期39卷 406-412页

作者： Cheng Huang xue-you Li Liu-Jun Shi xue-Long Jiang Kunming Institute of Zoology Chinese Academy of Sciences Kunming Yunnan 650223 China Kunming College of Life Sciences University of Chinese Academy of Sciences Kunming Yunnan 650223 China Daxueshan Nature Reserve Yongde Yunnan 677600 China

Understanding the spatial patterns of human-wildlife conflict is essential to inform management decisions to encourage coexistence, but it is constrained by the lack of spatially-explicit data. We collected spatially-implicit data of human-wildlife conflicts from 2009-2015 around Daxueshan Nature Reserve, Yunnan, China, and investigated the patterns and drivers of these conflicts. A questionnaire was also designed to capture local resident attitudes toward insurance-based compensation for the losses caused by targeted wildlife. We found that the Asiatic black bear （Ursus thibetanus） was the most conflict-prone animal around the reserve, followed by the rhesus macaque （Macaca mulatta） and Southeast Asian sambar （Cervus equinus）. Conflicts were unevenly distributed among seasons, villages, and communities, with several grids identified as conflict hotspots. Poisson models revealed that human-bear conflicts were negatively related to distance to the reserve and proportion of forest, but positively correlated to the proportion of cropland. Binomial models showed that communities affected by crop depredation were positively correlated with the proportion of cropland and negatively correlated with distance to the reserve, whereas communities affected by livestock depredation were negatively correlated with the proportion of cropland. The insurance-based scheme has compensated over 90% of losses, to the satisfaction of 90.6% of respondents. Our results suggest that human-bear conflict could be potentially reduced by eliminating food crops near the reserve boundary and livestock grazing at conflict *** addition, the insurance-based scheme could be replicated at a broader scale with improvement in loss assessment.

关键词： Human-wildlife conflict Asiatic black bear Spatial heterogeneity Insurance scheme Daxueshan Nature Reserve

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Effect of Western medicine therapy assisted by Ginkgo biloba tablet on vascular cognitive impairment of none dementia

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Asian Pacific Journal of Tropical Medicine 2012年第8期5卷 661-664页

作者： Shi-Jin Zhang Zhan-you xue Department of Traditional Chinese Medicine People's Hospital of Zhengzhou Department of Neurology the First Affiliated Hospital of Zhengzhou University

Objective:To discuss the clinical effects of Western medicine therapy assisted by Ginkgo biloba tablet(GBT) on patients with vascular cognitive impairment of none dementia(VCIND).Methods: A total of 80 patients with VCIND were divided into two groups randomly:Conventional treatment group(control group) and combined treatment *** treatment group was given conventional treatment with anti-platelet *** this group,75 mg aspirin was given three times a day for 3 *** in combined treatment group,19.2 mg CRT was given three times a day for 3 months together with conventional treatment(anti-platelet aggregation drugs). Montreal cognitive assessment(MoCA) and transcranial Doppler(TCD) were used to observe changes of cognitive ability and cerebral blood flow in VCIND patients before and after treatment in both *** the clinical data were analyzed so as to compare the efficacy in two groups. Results:After 3 month-treatment in combined treatment group,the scores of executive ability, attention,abstract,delayed memory,orientation in the MoCA were significantly increased compared with those before treatment and those in control group after ***,blood flow velocity of anterior cerebral artery increased significandy than that before treatment and that in control group after ***:CBT tablet can improve the therapeutic efficacy as well improve cognitive ability and cerebral blood flow supply of patients with VCIND.

关键词： Combination of traditional Chinese and Western medicine Cognitive impairment Ginkgo tablet Clinical evaluation

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Ballistic penetration damages of hybrid plain-woven laminates with carbon,Kevlar and UHMWPE fibers in different stacking sequences

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Defence Technology（防务技术） 2023年第8期26卷 23-38页

作者： Zhi-yong Li you-song xue Bao-zhong Sun Bo-hong Gu Shanghai Frontier Science Research Center for Modern Textiles College of TextilesDonghua UniversityShanghai201620China

Hybrid composite materials combine different fibers in preform and take advantages of different mechanical behaviors for improving ballistic impact damage *** we report ballistic impact damages of plain-woven laminates with different hybrids and stacking *** kinds of hybrid laminates,i.e.,carbon/Kevlar,carbon/ultra-high molecular weight polyethylene(UHMWPE),and UHMWPE/Kevlar,had been prepared and tested in ballistic penetration with fragment simulating projectiles(FSP).The residual velocities of the projectiles and impact damage morphologies of the laminates have been obtained to show impact energy absorptions for the different hybrid schemes.A microstructural model of the hybrid laminates had also been established to show impact damage mechanisms with finite element analysis(FEA).We found that the UHMWPE/Kevlar hybrid laminates with Kevlar layers as the front face have the highest energy absorption capacity,followed by the carbon/Kevlar hybrid laminates with carbon layers as the front *** main damage modes are fiber breakages,matrix crack and interlayer *** ballistic damage evolutions from the FEA results show that the major damage is shear failure for front layers,while tension failure for the back *** expect that the ballistic impact performance could be improved from the different hybrid schemes.

关键词： Hybrid laminates Ballistic impact damages Energy absorption Finite element analysis(FEA)

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Tiger reappearance in Medog highlights the conservation values of the region for this apex predator

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Zoological Research 2023年第4期44卷 747-749页

作者： xue-you Li Wen-Qiang Hu Hong-Jiao Wang xue-Long Jiang State Key Laboratory of Genetic Resources and Evolution&Yunnan Key Laboratory of Biodiversity and Ecological Conservation of Gaoligong Mountain Kunming Institute of ZoologyChinese Academy of SciencesKunmingYunnan 650223China

In less than a century,Asia’s largest apex predator,the tiger(Panthera tigris),has been relegated to isolated populations surviving in only a small fraction of its historical *** Medog region,located in Xizang Zizhiqu(Tibet),China,is an important stronghold for this ecologically important apex *** enhance our knowledge of the status of tigers in the Medog region,we carried out a systematic camera trapping survey combined with socioecological data collection between April 2020 and May *** surveyed a 1769 km2 area across the Medog region,with a total valid sampling effort of 43163 camera days from 322 camera *** also collected socioecological data from 27 forest *** documented tigers at eight camera trapping stations at two villages separated by the Jinzhu Tsangpo River,confirming the presence of at least one adult male individual within the Medog *** new records were observed over 80 km northeast of the first record in ***,residents reported tiger sightings in 2020 and likely tiger pugmarks in *** spatially and temporally separate records of tigers in the Medog region provide valuable data for informing species-oriented conservation management and highlight the importance of the region for tiger movement and population ***,although encouraging,our survey also detected human activities that may threaten tigers and their potential *** the future survival of tigers in the Medog region entails anti-poaching patrols and long-term camera trapping *** addition,it is also important to identify and establish corridors that connect the Medog region with the adjacent Zangnan region,which also harbors an important population of tigers.

关键词： northeast harbor trapping

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Viscosity and structure of CaO-BaO-SiO_(2)-Al_(2)O_(3)-based mold slags for continuous casting of high titanium steel with different Tio2 absorption

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Journal of Iron and Steel Research International 2024年第8期31卷 1936-1946页

作者： Ya-tao Cui xue-you Wang Xu-bin Zhang Qiang-qiang Wang Sheng-ping He College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

The effect of TiO_(2) absorption into two different CaO-BaO-SiO_(2)-Al_(2)O_(3)-based mold slags from the steel plant on the viscosity,melting performance and microstructure of slags was investigated through the measurement of the viscosity-temperature relationship,melting temperature and Raman *** parameter of the number of non-bridging oxygen per tetrahedrally-coordinated atom(NBO/T)was also calculated to explain the microstructure variation of molten slags with different TiO_(2) *** variation of the actual slag consumption and the depth of the liquid slag in mold was explained through the comparison of the viscosity and the melting temperature of two different *** viscosity of mold slags(basicity=0.6)decreased from 1.1 to 0.68 Pa s with the increase in the Ti0_(2) absorption from 0 to 10%,while that of slags(basicity=0.7)decreased from 0.76 to 0.56 Pa s with the Ti0_(2) absorption from 0 to 6%.The activation energy of both two groups of slags had the tendency to decrease with the increasing TiO_(2) *** network structure of both two groups of slags measured by the Raman spectra showed that the fraction of complex structure units(Q^(1),Q^(2),Q^(3) and A1-O-Al)decreased and simple structure units(Al-O-and Q^(0))increased with the increase in TiO_(2) ***/T also increased with the increase in the TiO2 absorption,indicating that the absorption of TiO_(2) into slags resulted in the destruction of silicate/aluminate ***,the absorption of TiO_(2) into the current CaO-BaO-SiO_(2)-Al_(2)O_(3) mold slags decreased the degree of polymerization of these slags and then led to the decrease of viscosity.

关键词： Mold slag Viscosity Melting temperature Slag consumption Liquid slag depth Structure

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Review of electrochemical degradation of phenolic compounds

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International Journal of Minerals,Metallurgy and Materials 2021年第9期28卷 1413-1428页

作者： you xue Xi Hu Qian Sun Hong-yang Wang Hai-long Wang Xin-mei Hou Beijing Advanced Innovation Center for Materials Genome Engineering Collaborative Innovation Center of Steel TechnologyUniversity of Science and Technology BeijingBeijing 100083China State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China State Environmental Protection Key Laboratory of Environmental Planning and Policy Simulation Chinese Academy of Environmental PlanningBeijing 100012China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China

Phenolic compounds are widely present in domestic and industrial sewage and have serious environmental *** oxidation(EO)is one of the most promising methods for sewage degradation because of its high efficiency,environmental compatibility,and *** this work,we present an in-depth overview of the mechanism and factors affecting the degradation of phenolic compounds by *** particular,the effects of treatment of phenolic compounds with different anode materials are discussed in *** non-active anode shows higher degradation efficiency,less intermediate accumulation,and lower energy consumption than the active *** combined with other treatment methods(biological,photo,and Fenton)presents advantages,such as low energy consumption and high degradation ***-while,the remaining drawbacks of the EO process in the phenolic compound treatment system have been ***,future re-search directions are put forward to improve the feasibility of the practical application of EO technology.

关键词： electrochemical oxidation phenolic compounds degradation mechanism anode material

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Several important problems of chemical metallurgy in arc welding

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China Welding 1995年第1期4卷 1-10页

作者： you Aiqing and xue Songbai(Harbin Research Institute of Welding)

The following three aspects are discussed:the metallurgical behavior of hydrogen during welding;the oxygen content and the modes of oxide inclusions in weld metal; and the basicity calculation of welding *** metallurgical behaviors of hydrogen during welding are determined according to the results of measuring the hydrogen contents in welding fume, slag and the weld metal with E4303(ilmenite type) and E5015 (low hydrogen type) electrodes *** is verified that hydrogen exists mostly in welding fume in the form of moisture and that secondly in welding *** mechanism of dehydrogenation in MMA welding process is proposed and relevant calculation and experiments have been conducted to verify the course. The total amount of oxygen in weld metal is mainly determined by the amount of oxygen which can be dissociated from various oxides in the molten slag and can be predicted through *** modes of oxide inclusions in weld metal are determined by the structures of the slag.A formula for basicity calculation is proposed which is based on the free energy of the reaction between oxides and the free energy of forming oxide compound. And the basicity of CaF2 is also specified.

关键词： chemical metallurgy hydrogen content oxygen content inclusion basicity

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