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Combined and synergistic effects of climate change and urbanization on water quality in the Wolf Bay watershed,southern Alabama

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Journal of Environmental Sciences 2018年第2期30卷 107-121页

作者： ruoyu wang Latif Kalin Purdue University Department of Agricultural and Biological Engineering Auburn University School of Forestry and Wildlife Sciences

This study investigated potential changes in flow, total suspended solid（TSS） and nutrient（nitrogen and phosphorous） loadings under future climate change, land use/cover（LULC）change and combined change scenarios in the Wolf Bay watershed, southern Alabama,USA. Four Global Circulation Models（GCMs） under three Special Report Emission Scenarios（SRES） of greenhouse gas were used to assess the future climate change（2016–2040）. Three projected LULC maps（2030） were employed to reflect different extents of urbanization in future. The individual, combined and synergistic impacts of LULC and climate change on water quantity/quality were analyzed by the Soil and Water Assessment Tool（SWAT）.Under the ＂climate change only＂ scenario, monthly distribution and projected variation of TSS are expected to follow a pattern similar to streamflow. Nutrients are influenced both by flow and management practices. The variation of Total Nitrogen（TN） and Total Phosphorous（TP） generally follow the flow trend as well. No evident difference in the N：P ratio was projected. Under the ＂LULC change only＂ scenario, TN was projected to decrease,mainly due to the shrinkage of croplands. TP will increase in fall and winter. The N：P ratio shows a strong decreasing potential. Under the ＂combined change＂ scenario, LULC and climate change effect were considered simultaneously. Results indicate that if future loadings are expected to increase/decrease under any individual scenario, then the combined change will intensify that trend. Conversely, if their effects are in opposite directions, an offsetting effect occurs. Science-based management practices are needed to reduce nutrient loadings to the Bay.

关键词： Climate change Urbanization Sediment Nutrients SWAT

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Exploration of acceptable operating range for a compression system in a double bypass engine

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Chinese Journal of Aeronautics 2023年第9期36卷 111-122页

作者： ruoyu wang Xianjun YU Baojie LIU Guangfeng AN Research Institute of Aero-Engine Beihang UniversityBeijing 102206China National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics Beijing 102206China

The variable cycle engine is distinguished by its highly adjustable compression system,whose aerodynamic characteristic is extremely *** explore the regulation range of a double bypass engine compression system,a multi-dimensional analysis method is developed,through which the coupling mechanism between the compressor component and the bypass is *** operation zones of the compressor components and the bypass system are proposed,and the operation range of the compression system is obtained by calculating the overlapping part of the operation *** results show that in the double bypass mode,there exists a minimum mode selector valve area and a minimum core driven fan stage stall margin that ensures a feasible bypass flow,the two parameters correspond to each *** the given fan and core driven fan stage conditions,the maximum value of the inner bypass ratio is restricted by the upper limit of the forward variable area bypass injector and the maximum Mach number in the total bypass,while the minimum value of the inner bypass ratio depends on the lower limit of the forward variable area bypass injector geometry and the system recirculation *** single bypass mode is a unique condition of the double bypass mode,as the operation zone of the compressor component degenerates from a two-dimensional surface to a straight *** are multiple bypass states available in the single bypass mode,while the regulation range of the bypass ratio is jointly restricted by the operation range of the high pressure compressor and the aerodynamic boundary of the forward variable area bypass injector.

关键词： Compression system Coupling effect Matching mechanism Multi-dimensional method Operation range Variable cycle engine

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Bipolar ionomer electrolytes with desirable self-discharge suppression for supercapacitors

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Journal of Energy Chemistry 2023年第3期78卷 422-429,I0012页

作者： Wenqiang wang Qingyun Zeng ruoyu wang Gengchao wang Chunzhong Li Shanghai Engineering Research Center of Hierarchical Nanomaterials Shanghai Key Laboratory of Advanced Polymeric MaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China Shanghai Engineering Research Center of Hierarchical Nanomaterials School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Supercapacitors based on electric double layers are prone to serious self-discharge due to electrolyte ion desorption and the resulting energy loss severely limits the application range of *** design of polymer electrolyte systems to address this problem shows considerable generality and high ***,we reported a quasi-solid-state bipolar ionomer electrolyte prepared by an in-situ layer-by-layer ultraviolet-curing method,which has an integrated Janus structure with an intermediate binding *** on the synergistic effect of confining impurity ions by ionizable groups and electrostatic repulsion to stabilize the electric double layers and superimposing synergies on both sides,the assembled device not only possesses ideal supercapacitor characteristics,but also exhibits an ultrahigh voltage retention of 71% after being left to stand for 100 h after being fully ***,through the quasi-in-situ energy dispersive X-ray spectroscopy linear scanning,the characteristics of ion diffusion in this ionomer electrolyte are revealed,suggesting its correlation with self-discharge behavior.

关键词： Bipolar membrane Ionomer electrolyte Supercapacitors Self-discharge

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A 400MHz Single-Chip CMOS Transceiver for Long Range High Definition Video Transmission in UAV Application

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Chinese Journal of Electronics 2020年第3期29卷 554-562页

作者： HUANG Shuigen LIN Min wang ruoyu CHEN Zhuojun DONG Yemin Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai University

A fully-integrated 400MHz transceiver for high definition video transmission in Unmanned aerial vehicle（UAV） is presented. The transceiver integrates a Receiver（RX）, a Transmitter（TX）, a tunable multi-mode complex filter, two sigma-delta fractional-N PLL frequency synthesizers and some baseband calibration circuits, which is applicable for both Time division duplex（TDD） and Frequency division duplex（FDD） systems. In order to meet different data rate and sensitivity requirements for control signal and video signal transmission, the transceiver supports BPSK/QPSK/QAM *** receiver sensitivity is –75dBm and the transmitter provides emission power up to 12dBm. Besides, the Error vector magnitude（EVM） of –35dB is measured under 64QAM modulation with 54Mbps data *** in a standard 130nm CMOS process and operated at 1.2V supply for most circuits excluding PA,3.3V supply for PA, the receiver and the transmitter consume 68.2mW and 164.3mW, including the frequency synthesizer, respectively. The total chip area with pads is 6.25 mm;.

关键词： CMOS Transceiver Unmanned aerial vehicle(UAV) Wireless video transmission

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New insights into component matching mechanism in the compression system of double bypass engine

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Propulsion and Power Research 2024年第1期13卷 118-131页

作者： ruoyu wang Xianjun Yu Baojie Liu Guangfeng An Research Institute of Aero-Engine Beihang UniversityBeijing 100191China National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics Beihang UniversityBeijing 100191China

Variable cycle engine(VCE)is one of the most promising technologies for the next-generation aircraft,the matching of different components in the compression system is a key difficulty VCE *** investigate the component matching mechanisms in the VCE compression system,an advanced throughflow program is employed to calculate the characteristic lines of each component,and a zero-dimensional method is developed to cap-ture the component performance deviation during the coupling working *** setting the compressor stall and choke conditions as the boundary,the operation range of the compression system isfirst clarified,and the aerodynamic performance in the operation zone is discussed,thus providing a theoretical basis for optimization of the engine operating con-trol *** show that the efficiency of the coreflow is optimum at the left-bottom corner of the operation region,while the total pressure ratio peaks at the right-top area,hence a balance is needed when deciding the matching *** of component control pa-rameters will change the position of the operation zone,as well as the corresponding aerody-namic *** the core driven fan stage rotating speed can improve the total bypass ratio,yet the total pressure ratio of the coreflow will be *** the core driven fan stage inlet guide vane can increase the total bypass ratio without changing the core flow aerodynamic performance *** bypass ratio of the compression system can also be increased by increasing the fan stall margin or decreasing its rotating speed,both ways will decrease the total pressure ratio of the core *** of the study will benefit the variable cycle engine design process in operation point evaluation and thermodynamic cycle optimization.

关键词： Matching analysis Double bypass engine Compression system Operation zone Aerodynamic performance

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Local Governments＇ Fiscal Pressure and the Dependence on Polluting Industries in China

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China & World Economy 2017年第4期25卷 109-130页

作者： ruoyu wang Qi Zhang Graduate Student School of Economics Fudan University China Associate Professor China Center for Economic Studies under the School of Economics Fudan University China

Using a large, unique county-level panel dataset for China from 1998 to 2006, this paper investigates the relationship between local governments ＇fiscal pressure and their preference for developing polluting industries. The results show that there exist fiscal pressure effects; namely, a positive link between the fiscal pressure faced by a county and its industrial tax dependence on polluting industries. We also investigate the heterogeneity of the fiscal pressure effects and find that fiscal pressure effects are significant only when local fiscal pressure is sufficiently high up to a certain point, and when there are more earmarked transfers. In contrast to the situation in east China, fiscal pressure effects in central and west China are more pronounced Therefore, when dealing with environmental problems, policy-makers need to take local governments＇ fiscal conditions into account.

关键词： China fiscal pressure industrial dependence polluting industry

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海藻酸盐基复合水凝胶培养乳腺癌类器官中钙离子的关键作用

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中国组织工程研究 2025年第22期29卷 4702-4709页

作者：林志光饶琪梁珊珊王若雨于炜婷大连大学附属中山医院肿瘤中心辽宁省大连市116001 大连大学中山临床学院辽宁省大连市116001 大连市海洋多糖生物材料转化医学重点实验室辽宁省大连市116001

背景:基质胶是当前培养肿瘤类器官的主要材料,但单纯基质胶不足以在体外模拟肿瘤生长的力学环境;在基质胶基础上引入海藻酸盐材料可提升水凝胶刚度,但水凝胶力学性能在长期培养中难以维持稳定。目的:在乳腺癌类器官培养体系中引入少量... 详细信息

背景:基质胶是当前培养肿瘤类器官的主要材料,但单纯基质胶不足以在体外模拟肿瘤生长的力学环境;在基质胶基础上引入海藻酸盐材料可提升水凝胶刚度,但水凝胶力学性能在长期培养中难以维持稳定。目的:在乳腺癌类器官培养体系中引入少量钙离子,观察其对基质胶-海藻酸钠水凝胶长期力学性能的维持作用。方法:(1)在恒定质量浓度(5 mg/m L)的基质胶中引入不同质量浓度(0,2.5,5 mg/m L)的海藻酸钠,分别制备低、中、高刚度水凝胶,使用流变仪定期测量水凝胶的力学性能。(2)将人三阴性乳腺癌细胞MDA-MB-231重悬于不同刚度的水凝胶预凝胶中,成胶后加入含(或不含)钙离子的乳腺癌类器官因子培养基,进行乳腺癌类器官培养,在设定的时间点,使用流变仪定期测量引入钙离子对水凝胶力学性能的影响,光学显微镜下观察乳腺癌类器官形态变化,统计第13天乳腺癌类器官成球率。乳腺癌类器官培养7 d后,加入不同浓度(0.1,1,10,100 nmol/L)的化疗药物多西他赛干预6 d,检测细胞活力,计算多西他赛的半抑制浓度IC_(50)。结果与结论:(1)海藻酸钠的加入有效提高了水凝胶的力学强度。(2)随着乳腺癌类器官培养时间的延长,水凝胶的力学强度均降低,培养第13天,中、高刚度水凝胶在含钙离子培养环境中的力学性能均显著高于在不含钙离子培养环境中的力学性能(P0.05)。在长期培养中(13 d),中、高刚度水凝胶组乳腺癌类器官随水凝胶力学性能的下降由圆形转化为梭形,而引入钙离子后两组乳腺癌类器官形态不随培养时间延长而改变。在培养环境中引入钙离子对低刚度水凝胶组乳腺癌类器官成球率无影响,但可提升中、高刚度水凝胶组乳腺癌类器官成球率。(3)在不含钙离子的培养环境中,随着多西他赛浓度的升高,乳腺癌类器官的细胞活力均降低,3组水凝胶组间的IC_(50)无明显差异(P>0.05);在含钙离子的培养环境中,随着多西他赛浓度的升高,乳腺癌类器官的细胞活力均降低,中、高刚度水凝胶组乳腺癌类器官的细胞活力强于低刚度水凝胶组,IC_(50)高于低刚度水凝胶组(P<0.05)。(4)结果表明,在乳腺癌类器官培养体系中引入钙离子可维持基质胶-海藻酸钠水凝胶的力学性能。

关键词：肿瘤类器官乳腺癌类器官海藻酸钠基质胶复合水凝胶基质刚度药物反应

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A multifunctional electrolyte additive for zinc-ion capacitors with low temperature resistant and long lifespan

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Journal of Energy Chemistry 2024年第7期94卷 477-485页

作者： Ming Sun Zekai Zhang Shuqing Fu Yifan Zhang ruoyu wang Hongchun Mu Cheng Lian Wenqiang wang Gengchao wang Shanghai Engineering Research Center of Hierarchical Nanomaterials Shanghai Key Laboratory of Advanced Polymeric MaterialsSchool of Materials Science and EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Chemical Engineering Shanghai Engineering Research Center of Hierarchical NanomaterialsFrontiers Science Center for Materiobiology and Dynamic Chemistryand School of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China

Aqueous zinc-ion capacitors (ZICs) are considered as potential candidates for next generation electrochemical energy storage devices due to their high safety and low ***,the existing aqueous ZICs usually have the problems of zinc dendrite growth and unsatisfactory performance at low ***,an erythritol (Eryt) additive with inhibition of zinc dendrites and anti-freezing capability was introduced into the *** experimental characterization and theoretical calculation confirm that the Eryt adsorbed on the surface of zinc anodes regulates the deposition orientation of Zn^(2+) and inhibits the formation of *** also reconstructs the solvation structure in the electrolyte to reduce water activity,enabling the electrolyte to have a lower freezing point for operation at low *** the assistance of Eryt,the Zn||Zn symmetric cell exhibits a long cycle life of 2000 h,while the ZIC assembled with activated carbon (AC) cathode and zinc anode (Zn||AC) maintains a capacity retention of 98.2% after 30,000 cycles at a current density of 10 A g^(-1)(even after 10,000 cycles at-20°C,the capacity retention rate reached 94.8%.).This work provides a highly scalable,low-cost and effective strategy for the protection of the anodes of low-temperature aqueous ZICs.

关键词： Zinc-ioncapacitors Electrolyte additive Dendrite-free Freeze-resistant electrolyte

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Numerical study of the flow structures in flat plate and the wall-mounted hump induced by the unsteady DBD plasma

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Plasma Science and Technology 2017年第1期19卷 57-63页

作者： Jianyang YU Huaping LIU ruoyu wang Fu CHEN School of Energy Science and Engineering Harbin Institute of Technology Harbin 150001 People＇s Republic of China

In this work,the dielectric-barrier-discharge plasma actuator was employed to study the flow structures induced by the plasma actuator over a flat plate and a wall-mounted hump.A phenomenological dielectric-barrier-discharge plasma model which regarded the plasma effect as the body force was implemented into the Navier–Stokes equations solved by the method of large eddy *** results show that a series of vortex pairs,which indicated dipole formation and periodicity distribution were generated in the boundary layer when the plasma was applied to the flow over a flat *** would enhance the energy exchanged between the near wall region and the free ***,their spatial trajectories are deeply affected by the actuation *** the actuator was engaged in the flow over a wall-mounted hump,the vortex pairs were also produced,which was able to delay flow separation as well as to promote flow reattachment and reduce the generation of a vortex,achieving the goal of reducing dissipation and decreasing flow resistance.

关键词： DBD plasma flow structure large eddy simulations fluid dynamic

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Label-free colorimetric nanosensor with improved sensitivity for Pb^2+ in water by using a truncated 8-17 DNAzyme

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Frontiers of Environmental Science & Engineering 2019年第1期13卷 129-134页

作者： Abdul Ghaffar Memon Xiaohong Zhou Yunpeng Xing ruoyu wang Lanhua Liu Mohsin Khan Miao He Center for Sensor Tech no logy of Environment and Health State Key Joint Laboratory of ESPC School of Environment Tsinghua University Beijing 100084 China Department of Environmental Engineering NED University of Engineering and Technology Karachi 75270. Pakistan

Water pollution accidents, such as the Flint water crisis in the United States, caused by lead contamination have raised concern on the safety of drinking water distribution systems. Thus, the routine monitoring of lead in water is highly required and demands efficient, sensitive, cost-effective, and reliable lead detection methods. This study reports a label-free colorimetric nanosensor that uses unmodified gold nanoparticles (AuNPs) as indicators to enable rapid and ultra-sensitive detection of lead in environmental water. The 8-17 DNAzyme was truncated in this study to facilitate the detachment of single-stranded DNA fragments after substrate cleavage in the presence of Pb「. The detached fragments were adsorbed over AuNPs and protected against salt concentration-induced aggregation. Accordingly, high Pb^2+ would result in rapid color change from blue to pink. The established sensing principle achieved a sensitive limit of detection of 0.2×10^-9mol/L Pb^2+. with a linear working range of two orders of magnitude from 0.5×10^-9mol/L to 5×10^-9mol/L. The selectivity of the nanosensor was demonstrated by evaluating the interfering metal ions. The developed nanosensor can serve as a substitute for the rapid analysis and monitoring of trace lead levels under the drinking water distribution system and even other environmental water samples.

关键词： Colorimetric nanosensor Truncated 8-17 DNAzyme Pb^2+ detection Unmodified AuNPs

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