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| 1 | Chinese deserts and sand fields in Last Glacial Maximum and Holocene Optimum显示文摘The Last Glacial Maximum (LGM, c. 26-16 ka) and the Holocene Optimum (HO, c. 9-5 ka) were characterized by cold-dry and warm-wet climates respectively in the recently geological Earth. How Chinese deserts and sand fields responded to these distinctive climatic changes is still not clear, however. To reconstruct environments of the deserts and sand fields during the LGM and HO is helpful to understand the forcing mechanisms of environment change in this arid region, and to test paleoclimatic modeling results. Through our long-term field and laboratory investigations, 400 optically stimulated luminescence (OSL) ages and more than 100 depositional records in the Chinese deserts and sand fields were obtained; on the basis of these data, we reconstruct spatial distributions of the deserts and sand fields during the LGM and HO. Our results show that the sand fields of Mu Us, Hunshandake, Horqin and Hulun Buir in northern and northeastern China had expanded 25%, 37%, 38% and 270%, respectively, during the LGM; the sand fields of Gonghe in the northeastern Qinghai-Tibetan Plateau had expanded 20%, and the deserts of Badain Jaran, Tengger in central northern China had expanded 39% and 29% separately during the LGM; the deserts of Taklimakan, Gurbantünggüt and Kumtag in northwestern China had expanded 10%-20% respectively, compared to their modern areas. On the other hand, all of the sand fields were nearly completely covered by vegetation during the HO; the deserts in northwestern and central northern China were reduced by around 5%-20% in area during this time. Lakes in this arid region were probably expanded during the HO but this conclusion needs more investigation. Compared with the geological distributions of deserts and sand fields, human activity has clearly changed (expanded) the area of active sand dunes at the present time. Our observations show that environmental conditions of Chinese deserts and sand fields are controlled by regional climate together with human activity. | LU HuaYu YI ShuangWen XU ZhiWei ZHOU YaLi ZENG Lin ZHU FangYing FENG Han DONG LiNa ZHUO HaiXin YU KaiFeng MASON Joseph WANG XiaoYong CHEN YingYong LU Qi WU Bo DONG ZhiBao QU JianJun WANG XunMing GUO ZhengTang | 2013 | Chinese Science Bulletin2013，58，23： | 40 |
| 2 | A preliminary quantitative reconstruction of precipitation in southern Mu Us sandy land at margin of Asian monsoon-dominated region during late Quaternary显示文摘我们在场季风降水的第一个量的评价在在北中国的沙的陆地的迟了的 glacial-Holocene 期间,基于器官的碳从在亩的边缘的一个黄土沙序列的同位素的作文数据我们沙的土地。我们使用在季风降水和碳之间的关系是的现代土壤的同位素的作文类似物与次要的修正,重建降水回到 c。47 ka 以前。初步的结果显示年度季风降水在 8 ka 以后高,与 435 公里的一般水准;并且它与 194 公里的吝啬的价值在 18 和 8 ka 期间减少了。47-18 ka 的降水价值在二之间变化了。我们把重建的降水与另外的记录和 paleoclimatic 建模结果作比较,证明我们的记录同意从另外的来源,的季风降水的重建甚至捕获象更年轻的 Dryas 那样的短气候的事件。我们建议那太阳的发光,高纬度的温度 / 冰体积和本地蒸发一起在沙的陆地的修改潮湿。 | CHEN Yingyong LU Huayu YI Shuangwen ZHANG Enlou XU Zhiwei YU Kaifeng Joseph A. MASON | 2015 | Journal of Geographical Sciences2015，25，3： | 6 |
| 3 | Syntheses and Magnetic Properties of Cu(Ⅱ)-RE(Ⅲ) Heterobinuclear Complexes with N,N′-Bis(3-carboxyisalicylidene)-trimethylenediamine显示文摘SynthesesandMagneticPropertiesofCu(Ⅱ)-RE(Ⅲ)HeterobinuclearComplexeswithN,N′-Bis(3-carboxyisalicylidene)-trimethylenediamineTA... | TAO Ruo-jie, YU Zliao-wen and ZHOU Xu-ya(Departmeut of Chemistry, Henan University , Kaifeng, 475001 )JIN Dou-man(Hauau Institute of Chemistry . Zhengzhou, 450003 )LIAO Dai-zheng(Department of Chemistry , Nankai University , Tianjin, 300071) | 1994 | Chemical Research in Chinese Universities1994，10，3： | 4 |
| 4 | Heavy metals in a typical city-river-reservoir system of East China:Multi-phase distribution,microbial response and ecological risk显示文摘The rapid construction of artificial reservoirs in metropolises has promoted the emergence of city-river-reservoir systems worldwide.This study investigated the environmental behaviors and risks of heavy metals in the aquatic environment of a typical system composed of main watersheds in Suzhou and Jinze Reservoir in Shanghai.Results shown that Mn,Zn and Cu were the dominant metals detected in multiple phases.Cd,Mn and Zn were mainly presented in exchangeable fraction and exhibited high bioavailability.Great proportion and high mobility of metals were found in suspended particulate matter(SPM),suggesting that SPM can greatly affect metal multi-phase distribution process.Spatially,city system(Ci S)exhibited more serious metal pollution and higher ecological risk than river system(Ri S)and reservoir system(Re S)owing to the diverse emission sources.Ci S and Re S were regarded as critical pollution source and sink,respectively,while Ri S was a vital transportation aisle.Microbial community in sediments exhibited evident spatial variation and obviously modified by exchangeable metals and nutrients.In particular,Bacteroidetes and Firmicutes presented significant positive correlations with most exchangeable metals.Risk assessment implied that As,Sb and Ni in water may pose potential carcinogenic risk to human health.Nevertheless,Re S was in a fairly safe state.Hg was the main risk contributor in SPM,while Cu,Zn,Ni and Sb showed moderate risk in sediments.Overall,Hg,Sb and Ci S were screened out as priority metals and system,respectively.More attention should be paid to these priority issues to promote the sustainable development of the watershed. | Jun Yang Mingrui Zhou Kaifeng Yu Karina Yew-Hoong Gin Muhammad Hassan Yiliang He | 2022 | Journal of Environmental Sciences2022，34，2： | 2 |
| 5 | Fluorescence and Photosensitizing Behavior of N-(p-Phenoxyphenyl)methacrylamide and Its Polymer显示文摘A novel acrylic monomer bearing aromatic ethereality group N-(p -phenoxy-phenyl) methacrylamide(MAPOA) was synthesized and polymerized. The fluorescence spectra of MAPOA and its polymer were studied, showing that the polymer displays a stronger fluorescence than its monomer at the same chromophore concentration. The fluorescence of P(MAPOA) was quenched by adding electron deficiency monomers such as MMA, AN etc .. It is another example of showing the 'fluorescence structural self-quenching effect' as we reported previously, from which it is demonstrated again that this phenomenon is not an accidental one but a common effect for acrylic monomers bearing electon-donating chromophores. The photopolymerization of AN sensitized by MAPOA and P(MAPOA) was studied. The kinetic equation of the polymerization was obtained and represented as follows: R _p∝ 0.38 × 0.78 , R _p∝ 0.33 × 0.71 The overall activation energies were determined to be E_ a =24\^22 kJ/mol(MAPOA) and E_ a =26\^31 kJ/mol respectively. The fluorescence analysis of the resulted P(AN) showed that the sensitizer also entered into the P(AN) chains. A mechanism of the formation of a charge transfer complex and free radical initiation was suggested for the photopolymerization of AN sensitized by MAPOA and P(MAPOA). | GAO Qing-yu 1,2* , LIU Zhi-gui 1, GUAN Hui-li 1, YANG Geng-xu 1 and YU Xian-da 2 1. Laboratory of Lubrication and Functional Materials, Henan University, Kaifeng 475001, P.R. China 2. Lanzhou Institute of Chemistry and Physics, Chinese Academy of | 2002 | Chemical Research in Chinese Universities2002，18，1： | 2 |
| 6 | Separation of Samarium(Ⅲ) and Gadolinium(Ⅲ) by A Push-pull Liquid Membrane System显示文摘SeparationofSamarium(Ⅲ)andGadolinium(Ⅲ)byAPush┐pulLiquidMembraneSystemYANGGuang-hui*(DepartmentofChemistry,EducationColegeofJ... | YANG Guang hui * (Department of Chemistry, Education College of Jilin Province, Changchun, 130022) LI Ming yu, TANG Qi hong and GUO Dong hong (Department of Chemistry, Henan University, Kaifeng, 475001) WANG Xiang de and ZHANG Xiu juan | 1997 | Chemical Research in Chinese Universities1997，13，4： | 2 |
| 7 | A conjecture on k-factor-critical and 3-γ-critical graphs显示文摘For a graph G =(V,E),a subset VS is a dominating set if every vertex in V is either in S or is adjacent to a vertex in S.The domination number γ(G) of G is the minimum order of a dominating set in G.A graph G is said to be domination vertex critical,if γ(G-v) < γ(G) for any vertex v in G.A graph G is domination edge critical,if γ(G ∪ e) < γ(G) for any edge e ∈/E(G).We call a graph G k-γ-vertex-critical(resp.k-γ-edge-critical) if it is domination vertex critical(resp.domination edge critical) and γ(G) = k.Ananchuen and Plummer posed the conjecture:Let G be a k-connected graph with the minimum degree at least k+1,where k 2 and k≡|V|(mod 2).If G is 3-γ-edge-critical and claw-free,then G is k-factor-critical.In this paper we present a proof to this conjecture,and we also discuss the properties such as connectivity and bicriticality in 3-γ-vertex-critical claw-free graph. | WANG Tao1&YU QingLin2 1Institute of Applied Mathematics,College of Mathematics and Information Science,Henan University,Kaifeng 475001,China 2Department of Mathematics and Statistics,Thompson Rivers University,Kamloops,BC V2C5N3,Canada | 2010 | Science China Mathematics2010，53，5： | 2 |
| 8 | The preparation and mechanism studies of rice husk based porous carbon 显示文摘 | GUO Yupeng YANG Shaofeng YU Kaifeng | 2002 | Materials Chemistry and Physics2002，74，： | 1 |
| 9 | Silicon dioxide as coating on polystyrene nanoparticles in situ emulsion poly- merization显示文摘 | Ding Xuefeng Jiang Yanqiu Yu Kaifeng | 2004 | Materials Letters2004，58，： | 1 |
| 10 | The preparation and mechanism studies of rice husk based porous carbon显示文摘 | GOU Yupeng YANG Shaofeng YU Kaifeng | 2002 | Mater Chem Phys2002，74，2： | 1 |
| 11 | A novel approach to the synthesis of hollow silica nanoparticles显示文摘 | Xuefeng Ding Kaifeng Yu Yanqiu Jiang Hari-Bala Hengbin Zhang Zichen Wang | 2004 | Materials Letters2004，，27： | 1 |
| 12 | Preparation of TiO2 Nanoflakes and Their Influence on Lithium Ion Battery Storage Performance显示文摘 | LI Yi HAN Xiangbo LIANG Jicai LENG Xuning YE Kaiqi HOU Changmin YU Kaifeng | 2015 | Chemical Research in Chinese Universities2015，31，3： | 1 |
| 13 | Self-assembly and oriented organization of shape-eontroUed nanocrystalline TiO2 显示文摘 | YU Kaifeng ZHAO Jingzhe | 2005 | Materials Letters2005，59，21： | 1 |
| 14 | Review of trans-Mediterranean power grid interconnection:a regional roadmap towards energy sector decarbonization显示文摘Climate change is becoming an important issue in all fields of infrastructure development.Electricity plays a core role in the decarbonized energy system’s path to a regional zero-emission pattern.A well-built trans-Mediterranean backbone grid can hedge the profound evolution of regional power generation,transmission,and consumption.To date,only Turkey and the Maghreb countries(i.e.,Morocco,Algeria,and Tunisia)are connected with the Continental European Synchronous Area.Other south-and east-shore countries have insufficient interconnection infrastructures and synchronization difficulties that have proven to be major hurdles to the implementation of large-scale solar and wind projects and achievement of climate goals.This study analyzes the current trans-boundary grid interconnections and power and carbon emission portfolios in the Mediterranean region.To align with the recently launched new climate target‘Fit for 55’program and the accelerated large-scale renewables target,a holistic review of projected trans-Mediterranean grids and their market,technical,and financial obstacles of implementation was conducted.For south-and east-shore countries,major legal and regulatory barriers encompassing non-liberalized market structure,regulation gaps of taxation and transmission tariffs,and the private sector’s access rights need to be removed.Enhancement of domestic grids,substations,and harmonized grid codes and frequency,voltage,and communication technology standards among all trans-Mediterranean countries are physical prerequisites for implementing the Trans-Mediterranean Electricity Market.In addition,the mobilization of capital instruments along with private and international investments is indispensable for the realization of supranational transmission projects.As the final section of the decarbonization roadmap,the development of electric appliances,equipment,and vehicles with higher efficiency is inevitable in the decarbonized building,transportation,and industry sectors. | Kaifeng Yu Paul van Son | 2023 | Global Energy Interconnection2023，6，1： | 1 |
| 15 | Degradation of SARS-CoV-2 receptor ACE2 by the E3 ubiquitin ligase Skp2 in lung epithelial cells显示文摘An unexpected observation among the COVID-19 pandemic is that smokers constituted only 1.4%–18.5%of hospitalized adults,calling for an urgent investigation to determine the role of smoking in SARS-CoV-2 infection.Here,we show that cigarette smoke extract(CSE)and carcinogen benzo(a)pyrene(BaP)increase ACE2 mRNA but trigger ACE2 protein catabolism.BaP induces an aryl hydrocarbon receptor(AhR)-dependent upregulation of the ubiquitin E3 ligase Skp2 for ACE2 ubiquitination.ACE2 in lung tissues of non-smokers is higher than in smokers,consistent with the findings that tobacco carcinogens downregulate ACE2 in mice.Tobacco carcinogens inhibit SARS-CoV-2 spike protein pseudovirions infection of the cells.Given that tobacco smoke accounts for 8 million deaths including 2.1 million cancer deaths annually and Skp2 is an oncoprotein,tobacco use should not be recommended and cessation plan should be prepared for smokers in COVID-19 pandemic. | Guizhen Wang Qun Zhao Hui Zhang Fan Liang Chen Zhang Jun Wang Zhenyin Chen Ran Wu Hong Yu Beibei Sun Hua Guo Ruie Feng Kaifeng Xu Guangbiao Zhou | 2021 | Frontiers of Medicine2021，15，2： | 1 |
| 16 | Existence of Solution to Transpiration Cooling Control Problem | HAN Shizhong(Kaifeng Education College, Kaifeng, 475004)BU Chunxia ZHAO Yu(Institute of System Science, Academia Sinica, Beijing, 100080) | 1996 | Systems Science and Systems Engineering1996，6，2： | 1 |
| 17 | Macroscopic assembled graphene nanofilms based room temperature ultrafast mid-infrared photodetectors显示文摘Graphene with linear energy dispersion and weak electron-phonon interaction is highly anticipated to harvest hot electrons in a broad wavelength range.However,the limited absorption and serious backscattering of hot-electrons result in inadequate quantum yields,especially in the mid-infrared range.Here,we report a macroscopic assembled graphene(nMAG)nanofilm/silicon heterojunction for ultrafast mid-infrared photodetection.The assembled Schottky diode works in 1.5-4.0μm at room temperature with fast response(20-30 ns,rising time,4 mm2 window)and high detectivity(1.61011 to 1.9109 Jones from 1.5 to 4.0μm)under the pulsed laser,outperforming single-layer-graphene/silicon photodetectors by 2-8 orders.These performances are attributed to the greatly enhanced photo-thermionic effect of electrons in nMAG due to its high light absorption(~40%),long carrier relaxation time(~20 ps),low work function(4.52 eV),and suppressed carrier number fluctuation.The nMAG provides a long-range platform to understand the hot-carrier dynamics in bulk 2D materials,leading to broadband and ultrafast MIR active imaging devices at room temperature. | Li Peng Lixiang Liu Sichao Du Srikrishna Chanakya Bodepudi Lingfei Li Wei Liu Runchen Lai Xiaoxue Cao Wenzhang Fang Yingjun Liu Xinyu Liu Jianhang Lv Muhammad Abid Junxue Liu Shengye Jin Kaifeng Wu Miao-Ling Lin Xin Cong Ping-Heng Tan Haiming Zhu Qihua Xiong Xiaomu Wang Weida Hu Xiangfeng Duan Bin Yu Zhen Xu Yang Xu Chao Gao | 2022 | InfoMat2022，4，6： | 1 |
| 18 | Application of Regularization Methods in the Sky Map Reconstruction of the Tianlai Cylinder Pathfinder Array显示文摘The Tianlai cylinder pathfinder is a radio interferometer array to test 21 cm intensity mapping techniques in the post-reionization era.It works in passive drift scan mode to survey the sky visible in the northern hemisphere.To deal with the large instantaneous field of view and the spherical sky,we decompose the drift scan data into m-modes,which are linearly related to the sky intensity.The sky map is reconstructed by solving the linear interferometer equations.Due to incomplete uv coverage of the interferometer baselines,this inverse problem is usually ill-posed,and regularization method is needed for its solution.In this paper,we use simulation to investigate two frequently used regularization methods,the Truncated Singular Value Decomposition(TSVD),and the Tikhonov regularization techniques.Choosing the regularization parameter is very important for its application.We employ the generalized cross validation method and the L-curve method to determine the optimal value.We compare the resulting maps obtained with the different regularization methods,and for the different parameters derived using the different criteria.While both methods can yield good maps for a range of regularization parameters,in the Tikhonov method the suppression of noisy modes are more gradually applied,produce more smooth maps which avoids some visual artefacts in the maps generated with the TSVD method. | Kaifeng Yu Shifan Zuo Fengquan Wu Yougang Wang Xuelei Chen | 2024 | Research in Astronomy and Astrophysics2024，24，2： | 0 |
| 19 | Finite-Element Simulation and Experimental Research of the Hot-Press Sintering of Nano-Sized Ceramic Powders显示文摘Numerical simulation of hot-press sintering of nano-sized ceramic powders was introduced by the commercial finite element code MSC.MARC. The powder plastic model and the thermo-mechanical coupled quadrilateral element were developed and adopted in the simulation. The mechanical and thermal properties of the nano-sized alumina based powders were determined.In addition, the experimental research and numerical simulation of the sintering process of different initial densities were carried out. The stress state in sintering of green compacts with different initial densities was analyzed by the densification theory.The reason for the density fluctuations of as-sintered ceramic bulks was found out. | Guoqing CHEN Kaifeng ZHANG Guofeng WANG Yandong YU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 0 |
| 20 | The Tianlai Cylinder Pathfinder array: System functions and basic performance analysis显示文摘The Tianlai Cylinder Pathfinder is a radio interferometer array designed to test techniques for 21 cm intensity mapping in the post-reionization Universe,with the ultimate aim of mapping the large scale structure and measuring cosmological parameters such as the dark energy equation of state.Each of its three parallel cylinder reflectors is oriented in the north-south direction,and the array has a large field of view.As the Earth rotates,the northern sky is observed by drift scanning.The array is located in Hongliuxia,a radio-quiet site in Xinjiang,and saw its first light in September 2016.In this first data analysis paper for the Tianlai cylinder array,we discuss the sub-system qualification tests,and present basic system performance obtained from preliminary analysis of the commissioning observations during 2016-2018.We show typical interferometric visibility data,from which we derive the actual beam profile in the east-west direction and the frequency band-pass response.We describe also the calibration process to determine the complex gains for the array elements,either using bright astronomical point sources,or an artificial on site calibrator source,and discuss the instrument response stability,crucial for transit interferometry.Based on this analysis,we find a system temperature of about 90 K,and we also estimate the sensitivity of the array. | JiXia Li ShiFan Zuo FengQuan Wu YouGang Wang JuYong Zhang ShiJie Sun YiDong Xu ZiJie Yu Reza Ansari YiChao Li Albert Stebbins Peter Timbie YanPing Cong JingChao Geng Jie Hao QiZhi Huang JianBin Li Rui Li DongHao Liu YingFeng Liu Tao Liu John PMarriner ChenHui Niu Ue-Li Pen Jeffery BPeterson HuLi Shi Lin Shu YaFang Song HaiJun Tian GuiSong Wang QunXiong Wang RongLi Wang WeiXia Wang Xin Wang KaiFeng Yu Jiao Zhang BoQin Zhu JiaLu Zhu XueLei Chen | 2020 | Science China(Physics,Mechanics & Astronomy)2020，63，12： | 0 |
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