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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 | Vision,application scenarios,and key technology trends for 6G mobile communications显示文摘With the global commercialization of the fifth-generation(5G)network,many countries,including China,USA,European countries,Japan,and Korea,have started exploring 6G mobile communication network,following the tradition of“planning the next while commercializing one generation”.Currently,studies on 6G networks are at the infancy stage.Research on the vision and requirements for 6G is still ongoing,and the industry is yet to clarify the key enabling technologies for 6G.However,6G will certainly build on the success of 5G.Therefore,developing high-quality 5G networks and seamlessly integrating 5G with verticals are the priorities before 2030,when 6G is projected to be commercialized.Also,global 5G standards will keep evolving to better support vertical applications.As a milestone,the Third-Generation Partnership Project(3GPP)published Release 16 in July 2020,which continuously enhanced the capabilities of mobile broadband service based on Release 15 and realized the support for low-delay and high-reliability applications,such as Internet of Vehicles and industrial Internet.Currently,3GPP is working on Releases 17 and 18,focusing on meeting the demands of medium-and high-data-rate machine communication with low-cost and high-precision positioning,which will be published in June 2022.Thus,6G networks will further expand the application fields and scope of the Internet of Things to accommodate those services and applications that are beyond the capabilities of 5G networks.Herein,we present our vision,application scenarios,and key technological trends for 6G networks.Furthermore,we propose several future research opportunities in 6G networks with regard to industrialization and standardization. | Zhiqin WANG Ying DU Kejun WEI Kaifeng HAN Xiaoyan XU Guiming WEI Wen TONG Peiying ZHU Jianglei MA Jun WANG Guangjian WANG Xueqiang YAN Jiying XIANG He HUANG Ruyue LI Xinhui WANG Yingmin WANG Shaohui SUN Shiqiang SUO Qiubin GAO Xin SU | 2022 | Science China(Information Sciences)2022，65，5： | 17 |
| 3 | MAP kinase specifically mediates the ABA-induced H_2O_2 generation in guard cells of Vicia faba L.显示文摘Mitogen-activated protein (MAP) kinase is involved in ABA- or H2O2-signaling, and H2O2 acts as inter-mediate in the downstream of ABA signal transduction pathway, which has recently emerged as a secondary mes-senger of ABA signaling. Using an epidermal strip bioassay and laser scanning confocal microscope, we provided the first evidence that MAP kinase plays an important role in H2O2 signal initial, amplification and specific targeting in response to stimuli in guard cells. ABA- or H2O2-induced Vicia faba stomatal closure was inhibited or reversed by the specific inhibitor PD98059 of MEK1/2; the guard cells were pre-incubated or -microinjected by 10 mmol·L-1 PD98059, ABA could not enhance the fluorescence intensity of H2O2 probe dichlorofluorescein (DCF). Meanwhile, after ABA induced the H2O2 accumulation in guard cells, the exogenous or intracellular PD98059 could reduce the DCF fluorescence intensity. Most interestingly, on the contrary to ABA, the DCF fluorescence intensity of guard cells treated by 100 mmol·L-1 salicylic acid (SA) was not down-regulated by PD98059, yet PD98059 did not regulate the stomatal move-ment being induced by light, dark or salicylic acid. These results suggest that MEK1/2 could mediate stomatal closure by abolishing the ABA-induced H2O2 generation/accumula- tion in the specific manner. | JIANG Jing1,2, AN Guoyong1, WANG Pengcheng1, WANG Pengtao1, HAN Jinfeng2, JIA Yanbin1 & SONG Chunpeng1 1. College of Life Sciences, Henan University, Kaifeng 475001, China 2. College of Agriculture Science, Henan Agriculture University, Zheng-zhou 450001, China Correspondence should be addressed to Song Chunpeng (e-mail: songcp @henu. edu.cn) | 2003 | Chinese Science Bulletin2003，48，18： | 10 |
| 4 | Study on north boundary of subtropical zone in Funiu Mountain according to soil geochemistry显示文摘The boundary between subtropical zone and temperate zone is not only important in physical geography, but also attractive in agricultural production. Seven soil profiles studied in this paper are placed along the southern slope of Funiu Mountain at different heights above sea level. Many compositions and properties of these soils have been determined in laboratory. In this paper, the laws of migration and accumulation of soil materials on the southern slope of Funiu Mountain are discussed first, then the division of the boundary between subtropical zone and temperate zone in this area according to soil geochemistry is discussed with qualitative methods and mathematical classification method in which twelve selected indexes such as K m , Saf, Ba, β, Feo/Fet, Mno/Mnt and so on are used. The result indicates that the boundary between subtropical zone and temperate zone on the southern slope of Funiu Mountain is about 950 m above sea level. | MA Jianhua,XU Shuming,HAN Jinxian,ZHU Lianqi,ZHAO Qingliang(College of Environment and Planning, Henan University, Kaifeng 475001, China) | 2003 | Journal of Geographical Sciences2003，13，3： | 1 |
| 5 | Superplastic forming and diffusion bonding for honeycomb structure of Ti-6A1-4V alloy显示文摘 | HAN Wenbo ZHANG Kaifeng WANG Guofeng | 2007 | Journal of Materials Processing Technology2007，183，23： | 1 |
| 6 | Acta Aeronautica et Astronautica Sinica显示文摘 | Zhang Kaifeng Yin Deliang Han Wenbo | 2005 | 26(4): 5052005，26，4： | 1 |
| 7 | Synthesis and Enhanced Superplasticity of the Zirconia-dispersed Alumina Nanocomposite显示文摘A series of alumina-zirconia composites with various grain sizes were prepared from the nano-sized powders with different agglomerations. Microstructural analysis of the sintered compacts indicates that the as-sintered material is a typical intra/inter granular nanocomposite with uniform distribution of the zirconia grains in the alumina matrix.Superplastic deep drawing test under different conditions demonstrates that dense Al2O3/ZrO2 samples with average grain size of 230 nm can be elongated to a dome height of at least 12 mm at the punch rate of 0.6 mm.min-1at 1400℃. Further drawing tests show that for the composites with larger grain size, such elongation cannot be achieved at such a strain rate. | Guoqing CHEN, Kaifeng ZHANG, Wenbo HAN and Junting LUOSchool of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, ChinaProf., Ph.D., | 2005 | Journal of Materials Science & Technology2005，21，1： | 1 |
| 8 | 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 |
| 9 | Superplastic forming and diffusion bonding for honeycomb structure of Ti-6Al-4V alloy显示文摘 | Han wenbo Zhang kaifeng Wang guofeng | 2007 | Journal of Materials Processing Technology2007，，23： | 1 |
| 10 | Numerical Simulation of Superplastic Forming and Diffusion Bonding of Ti Alloys显示文摘The research on numerical simulation for combinative process of SPF/DB is carried out in this paper. The contacting problem of sheets is analyzed by using the penalty method. In order to solve the contact problem of different parts of the sheet, a new algorithm for contacting judgment is proposed. According to the relation of the distance vector and the vector of contacting element area, and the condition of contact, it can be judged whether or not a node on the slave surface and the corresponding master surface are in the state of SPF/DB. The Mindlin shell element is employed to simulate SPF/DB process of an asymmetry double-cell cup of Ti-6Al-4V to examine the efficiency of the new algorithm using ARVIP-3D. The results of the numerical simulation are in good agreement with experimental results. | Kaifeng ZHANG Wenbo HAN Wei WU Guofeng WANG Dezhong WU | 2003 | Journal of Materials Science & Technology2003，19，z1： | 1 |
| 11 | Clarifying the construct of human resource systems: Relating human resource management to employee performance显示文摘 | Kaifeng Jiang David P. Lepak Kyongji Han Ying Hong Andrea Kim Anne-Laure Winkler | 2011 | Human Resource Management Review2011，，2： | 1 |
| 12 | Superplastic forming and diffusion bonding for honeycomb structure of Ti-6Al-4V alloy 显示文摘 | Han Wenbo Zhang Kaifeng Wang Guofeng | 2007 | Journal of Materials Processing Technolo- gy2007，183，23： | 1 |
| 13 | Cavitation Behavior during Superplastic Deformation of AZ31 Magnesium Alloy显示文摘Superplasticity of AZ31 Mg alloy at the temperature range of 250~450℃ and stain rate range of 0.7x10-3~ 1.4x 10-1 s-1 was examined through uniaxial tensile test. Optical microscopy (OM) and scanning electron microscopy (SEM) were employed to investigate the morphology of cavities and surface relief near fracture surface, respectively.It is shown that AZ31 Mg alloy starts to exhibit superplasticity from 300℃. The maximum elongation of 362.5%was obtained at 400℃ and strain rate of 0.7×10-3 s-1. There exist many O-shaped cavities and filaments at the boundaries near fracture surface. The fracture of filaments results in intergranular cavity and the model for the formation of intergranular cavities is proposed. The growth of cavities is plasticity-controlled and the serrated boundaries of intergranular cavities agree with the results of surface relieves. | Kaifeng ZHANG Deliang YIN Guofeng WANG Wenbo HAN | 2005 | Journal of Materials Science & Technology2005，21，4： | 1 |
| 14 | Superplastic forming and diffusion bonding for honeycomb structure of Ti - 6Al - 4V alloy 显示文摘 | Han Wenbo Zhang Kaifeng Wang Guofeng | 2007 | Journal of Materials Processing Technology2007，183，23： | 1 |
| 15 | Superplastic forming and diffusion bonding for honeycomb structure of Ti - 6Al-4V alloy显示文摘 | Han Wenbo Zhang Kaifeng Wang Guofeng | 2007 | Journal of Materials Processing Technology2007，183，23： | 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 | Superplastic forming and diffusion bonding for honeycomb structure of Ti-6Al-4V alloy 显示文摘 | Han Wenbo Zhang Kaifeng Wang Guofeng | 2007 | Journal of Materials Processing Technology2007，183，23： | 1 |
| 18 | Superplastic formingand diffusion bonding for honeycomb structure of Ti-6A1-4V alloy显示文摘 | Han Wenbo Zhang Kaifeng Wang Guofeng | 2007 | Journal of Materials Processing Technology2007，183，23： | 1 |
| 19 | Superplastic deformation behavior of hot-rolled AZ31 magnesium alloy sheet at elevated temperatures显示文摘 | Zhang Kaifeng Ph D Yin Deliang Ph D Wang Guofeng Han Wenbo | 2006 | Journal of Wuhan University of Technology - Mater Sci Ed2006，，3： | 1 |
| 20 | Fabrication of fine-grained Si3N4-Si2N2O composites by sintering amorphous nano-sized silicon nitride powders显示文摘 | Luo Junting Ph D Zhang Kaifeng Wang Guofeng Han Wenbo | 2006 | Journal of Wuhan University of Technology - Mater Sci Ed2006，，3： | 1 |
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