|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 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 | Impact of Holocene climate change on the prehistoric cultures of Zhejiang region, East China显示文摘自从在浙江区域的 Holocene 比较地基于 GIS 空间分析被分析,时间空间的分发史前的文化展示。结果证明史前的文化在 4000 cal 前在这个区域逐渐地膨胀了。BP。著名扩大发生了两次,在 Majiabang-Hemudu 文化时期的,其它在 Liangzhu 文化时期。同时,史前的文化沿着河山谷从西方被传播到东方海岸。在 4000 cal 以后。BP 由 Maqiao 文化代表了每种史前的文化的分布式的区域收缩了。这显然由于散布趋势到东方海岸的结束,它被生产和经济转变的二个不同模式同时分别地在北方和南方浙江区域伴随。在史前的文化地点的分发变化被海平面的变化极大地影响的地方,史前的文化的分发与 Holocene 海平面的变化是密切相关的,特别在 Hangzhou 海湾的河岸上,在他们之间的最靠近的关系地。在 7000 cal 以后。BP,这个过程降低海平面并且 regression-epeirogenesis 为史前的居民提供了更宽的陆上的生活空格。基于史前的文化和在华东海的内部架上在塔恩穆山和泥泞区域的 Qianmutian 亚高山带的泥炭记录的环境进化信息的变化的比较分析,史前的文化的变化在浙江与环境变化被同步,这被显示区域。在 4000 cal 前。BP,史前的文化在的东方扩大浙江在 Holocene 最佳的背景下面发生了,并且在农业文明和海上的文明的联合影响下面是扩大和延期。然而,在 4000 cal 以后。BP,在浙江的史前的文化的地理收缩发生在干燥寒冷的气候趋势的背地面和沿海的海洋的环境的恶化下面。它从史前的文化的发展,扩大和收缩断然被相关到环境变化的上述事实被证实。气候的环境的变化只是为生产模式和经济形式的这些变化和转变的内在的原因。因此,气候的环境是在浙江区域的史前的文化变化的主导的因素,它对文化的分发,传播,扩大和变化施加了大影响。 | WU Li ZHU Cheng ZHENG Chaogui MA Chunmei WANG Xinhao LI Feng LI Bing LI Kaifeng | 2014 | Journal of Geographical Sciences2014，24，4： | 8 |
| 3 | Comprehensive benefit of flood resources utilization through dynamic successive fuzzy evaluation model: A case study显示文摘Taking the flood resources utilization in Baicheng, Jilin during 2002–2007 as the research background, and based on the entropy weight and multi-level & multi-objective fuzzy optimization theory, this research established a multi-level & semi-constructive index system and dynamic successive evaluation model for comprehensive benefit evaluation of regional flood resources utilization. With the year 2002 as the base year, the analyzing results showed that there existed a close positive correlation between flood utilization volume and its benefits, comprehensive evaluation value and its comparison increment. Within the six successive evaluation years, the comprehensive benefit of 2003 was the best, in which the benefit evaluation increment reached 82.8% whereas the year of 2004 was the worst, in which the increment was only 18.2%. Thus the sustainability and correctness of the evaluation were verified by six years successive evaluation and increment comparison. The analyzing results showed that the economic benefits, ecological benefits and social benefits of flood utilization were remarkable, and that the comprehensive benefit could be improved by increasing flood utilization capacity, which would promote the regional sustainable development as well. The established dynamic successive evaluation provides a stable theoretical basis and technical support for further flood utilization. | FENG Feng1,2, XU ShiGuo1, LIU JianWei1, LIU Dan1,3 & WU Bo4 1 Institute of Water Environment, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China 2 Yellow River Conservancy Technical Institute, Kaifeng 475003, China 3 College of Water Resources, Shenyang Agricultural University, Shenyang 110161, China 4 Office of Flood Control and Draught Relief in Jilin Province, Changchun 130033, China | 2010 | Science China(Technological Sciences)2010，53，2： | 7 |
| 4 | Application of Fractal Theory in the Synthesis of Nano-sized 3Y-TZP Superplastic Ceramic Materials显示文摘Nano-sized 3Y-TZP powders were Synthesized by two methods. A fractal software was developed. A new and convenient method for characterizing the quality of Synthetic process by using fractal theory was obtained. | Guofeng WANG Kaifeng ZHANG and Dezhong WU School of Materials Science and Engineering, Harbin Institute of Technology Harbin 150001, China | 2001 | Journal of Materials Science & Technology2001，17，1： | 4 |
| 5 | Biexciton Auger recombination in mono-dispersed, quantum-confined CsPbBr3 perovskite nanocrystals obeys universal volume-scaling显示文摘Auger recombination has been a long?standing obstacle to many prospective applications of colloidal quantum dots (QDs) ranging from lasing, light-emitting diodes to bio-labeling. As such, understanding the physical underpinnings and scaling laws for Auger recombination is essential to these applications. Previous studies of biexciton Auger recombination in various QDs established a universal scaling of biexciton lifetime (rxx) with QD volume (V):τxx =γV. However, recent measurements on perovskite nanocrystals (NCs), an emerging class of enablers for light harvest!ng and emitting applications, showed significant deviations from this universal scaling law, likely because the measured NCs are weakly-confined and also have relatively broad size-distributions. Here we study biexciton Auger recombination in mono-dispersed (size distributions within 1.7%—9.0%), quantunvconfined CsPbBr3 NCs (with confinement energy up to 410 meV) synthesized using a latest approach based on thermodynamic equilibrium control. Our measurements clearly reproduce the volume-scaling of τxx in confined CsPbBb QDs. However, the scaling factor γ(0.085 ± 0.001 ps/nm^3) is one order of magnitude lower than that reported for CdSe and PbSe QDs (1.00 ± 0.05 ps/nm^3), suggest!ng unique mechanisms enhancing Auger recombination rate in perovskite NCs. | Yulu Li Tao Ding Xiao Luo Zongwei Chen Xue Liu Xin Lu Kaifeng Wu | 2019 | Nano Research2019，12，3： | 4 |
| 6 | Improved dispersion performance and interfacial compatibility of covalent-grafted MOFs in mixed-matrix membranes for gas separation显示文摘Mixed-matrix membranes(MMMs)have received much attention due to their processable advantages of polymer and high permeability and/or selectivity of porous metal-organic frameworks(MOFs)fillers.However,the interfacial defects caused by poor interaction between MOFs with polymers and the agglomeration phenomenon caused by uneven dispersion of MOFs are common problems in mixed-matrix membranes.Currently,the priming protocol is one of solutions to the above problems,but it cannot precisely regulate the dispersion of particles and the interfacial compatibility between two phases.Herein,covalent grafting of polyimide 6FDA-Durene onto the surface of UiO-66-NH2 can mitigate the aggregation of fillers inside the polymeric matrices and improve the interfacial interaction between two phases,thus significantly improving the CO_(2)/CH_(4)separation performance on the as-synthesized MMMs.The explored gas transport mechanism indicated that the improved separation was due to the raise of solubility selectivity.Furthermore,the stronger covalent bond between fillers and polyimide than physical interaction of priming protocol also endows the improved anti-plasticization phenomenon for CO_(2)/CH_(4)separation. | Chongqing Wang Guangjie Ren Kaifeng Wei Donghui Liu Tingting Wu Jinlong Jiang Junfeng Qian Yichang Pan | 2021 | Green Chemical Engineering2021，2，1： | 3 |
| 7 | Clinical characteristics in lymphangioleiomyomatosis-related pulmonary hypertension: an observation on 50 patients显示文摘Lymphangioleiomyomatosis (LAM) is a rare diffuse cystic lung disease. Knowledge on LAM-related pulmonary hypertension (PH) is limited. This study aimed to analyze the clinical characteristics of LAM with elevated pulmonary artery pressure (PAP) and evaluate the potential efficacy of sirolimus. The study involved 50 LAM patients who underwent echocardiography. According to the tricuspid regurgitation velocity (TRV), these patients were divided into the TRV≤2.8 m/s group and TRV>2.8 m/s group. Both groups comprised 25 females with an average age of 38.6±8.1 and 41.5±8.9 years. In the TRV>2.8 m/s group, the estimated systolic PAP (SPAP) was significantly elevated (52.08±12.45 mmHg vs. 30.24±5.25 mmHg, P<0.01). Linear analysis showed that SPAP was correlated with forced expiratory volume in 1 s (FEV1), diffusing capacity of the lungs for carbon monoxide, alveolar arterial oxygen gradient (PA-aO2), and 6 min walking distance (r =-0.392,-0.351, 0.450, and -0.591, respectively;P<0.05), in which PA-aO2 was a risk factor for SPAP elevation (β= 0.064, OR= 1.066, P<0.05). Moreover, in 10 patients who received sirolimus therapy, SPAP decreased from 57.0±12.6 mmHg to 35.2±11.1 mmHg. The study showed that LAM patients with PH exhibit poor pulmonary function and hypoxemia and may benefit from sirolimus treatment. | Xiuxiu Wu Wenshuai Xu Jun Wang Xinlun Tian Zhuang Tian Kaifeng Xu | 2019 | Frontiers of Medicine2019，13，2： | 3 |
| 8 | Hot deformation behavior and processing map of a powder metallurgy Ti–22Al–25Nb alloy显示文摘 | Jianbo Jia Kaifeng Zhang Liming Liu Fuyao Wu | 2014 | Journal of Alloys and Compounds2014，，： | 1 |
| 9 | Potential of microalgae as bioenergy and functional foods显示文摘 | Wu Shan Xu Xiangrong Sun Kaifeng | 2014 | International Journal of Environment and Bioenergy2014，9，1： | 1 |
| 10 | Association of growth rate with hormone levels and myogenic gene expression profile in broilers显示文摘Background: The growth rate often varies among individual broilers of the same breed under a common management condition. To investigate whether a variation in the growth rate is associated with a difference in hormone levels and myogenic gene expression profile in broilers, a feeding trial was conducted with 10,000 newly hatched Ross 308 chicks in a commercial production facility under standard management. At 38 d of age,30 fast-, 30 medium-, and 30 slow-growing broilers were selected among 600 healthy male individuals. The levels of insulin-like growth factor-1(IGF-1), triiodothyronine(T3), thyroxine(T4), and growth hormone in the serum or breast muscle were assayed by ELISA or RIA kits, and the expression levels of several representative pro-and anti-myogenic genes in the breast muscle were also measured by real-time PCR.Results: Results showed that both absolute and relative weights of the breast muscle were in linear positive correlations with the body weight of broilers(P < 0.001). Fast-growing broilers had higher concentrations of IGF-1 than slow-growing broilers(P < 0.05) in both the serum and breast muscle. The serum concentration of T3 was significantly higher in fast-growing birds than in slow-growing birds(P < 0.05). However, no difference was observed in growth hormone or T4 concentration among three groups of birds. Additionally, a decreased expression of an anti-myogenic gene(myostatin) and increased expressions of pro-myogenic genes such as myogenic differentiation factor 1, myogenin, muscle regulatory factor 4, myogenic factor 5, IGF-1, and myocyte enhancer factor 2B, C, and D were observed in fast-growing broilers(P < 0.05), relative to slow-growing broilers.Conclusions: Collectively, these findings suggested that the growth rate is linked to the hormone and myogenic gene expression levels in broiler chickens. Some of these parameters such as serum concentrations of IGF-1 and T3 could be employed to breed for enhanced growth. | Yingping Xiao Choufei Wu Kaifeng Li Guohong Gui Guolong Zhang Hua Yang | 2017 | Journal of Animal Science and Biotechnology2017，8，3： | 1 |
| 11 | 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 |
| 12 | A Novel Organic-Inorganic Complex: Synthesis and Crystal Structure of [Ca(DMSO)_5(H_2O)]_2SiMo_(12)O_(40)显示文摘A novel organic-inorganic complex [Ca(DMSO)5(H2O)]2SiMo12O40 was synthesized from CaCl2, DMSO and H4SiMo12O40nH2O in mixed solvent of acetonitrile and water. Its structure was characterized with elemental analysis, IR and X-ray diffraction analysis. | Jing Ping WANG, Qiang WU, Jing Yang NIU* School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001 | 2002 | Chinese Chemical Letters2002，13，9： | 1 |
| 13 | 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 |
| 14 | Problems caused by the Three Gorges Dam construction in the Yangtze River Basin: a review显示文摘 | LI Kaifeng ZHU Cheng WU Li | 2013 | Environmental Reviews2013，21，： | 1 |
| 15 | Influence of Multi-component Failure on Mechanical Product Design Change显示文摘Design change is one of the most common activities in design and development of mechanical products, and the change will affected by the design and maintenance of the products. It is not uncommon that multiple components might run out of order simultaneously during the use of a product, which would have significant influences on the product performance. Such kind of multi-component failure must be considered early in the product design stage, therefore it is necessary to study multiple design changes incurred by multi-component failure. Existing studies on the design change only focus on single change and ignore multiple simultaneous changes. To address this problem, a change influence network model is establishes, and the propagation path of multiple changes on the change influence network is described according to the change propagation characteristics of mechanical products. By analyzing the degree of dependence between the nodes and the absorption situations of nodes to change propagation, the possible paths of change propagation on the change influence network are determined, and based on which, calculation of the change influence is carried out, which provides decision-making support for product designers. Finally, the feasibility of the proposed methodology is demonstrated by taking a household juicer for case study. | ZHUO Kaifeng DENG Yimin WU Hongwei ZHANG Xingfa | 2019 | International Journal of Plant Engineering and Management2019，24，2： | 1 |
| 16 | Hole removal rate limits photodriven H2 generation efficiency in CdS- Pt and CdSe/CdS-Pt semiconductor nanorod+metal Tip heterostructures 显示文摘 | WU Kaifeng CHEN Zheyuan LV Hongjin | 2014 | J Am Chem Soc2014，136，21： | 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 | Influence of NH_3-treating temperature on visible light photocatalytic activity of N-doped P_(25)-TiO_2显示文摘The influence of NH3-treating temperature on the visible light photocatalytic activity of N-doped P25-TiO2 as well as the relationship between the surface composition structure of TiO2 and its visible light photocatalytic activity were investigated.The results showed that N-doped P25-TiO2 treated at 600℃ had the highest activity.The structure of P25-TiO2 was converted from anatase to rutile at 700℃.Moreover,no N-doping was detected at the surface of P25-TiO2.There was no simply linear relationship between the visible light photocatalytic activity and the concentration of doped nitrogen,and visible light absorption.The visible light photocatalytic activity of N-doped P25-TiO2 was mainly influenced by the synergistic action of the following factors:(i) the formation of the single-electron-trapped oxygen vacancies(denoted as Vo);(ii) the doped nitrogen on the surface of TiO2;(iii) the anatase TiO2 structure. | CHEN WeiPing1,2,WANG Yan1,JIN ZhenSheng1,2,FENG CaiXia1,WU ZhiShen1 & ZHANG ZhiJun1 1 Key Laboratory for Special Functional Materials,Henan University,Kaifeng 475004,China 2 College of Chemistry and Chemical Engineering,Henan University,Kaifeng 475004,China | 2009 | Science China Chemistry2009，52，8： | 0 |
| 20 | Theoretical studies on the possible conformers and properties of tetranitrodiazidoacetylhexaazaisowurtzitane (TNDAIW)显示文摘Tetranitrodiazidoacetylhexaazaisowurtzitane (TNDAIW) is a novel polyazapolycyclic caged polyazidonitramine explosive first synthesized in our laboratory. All of the possible con- formers of TNDAIW are optimized using both the AM1 and PM3 methods. TNDAIW is predicted to have more polymorphs than hexanitrohexaazoisowurtzitane (CL-20). The HF/6-31G(d) level of theory is used to investigate the lowest energy structures of D-TNDAIW for both AM1 and PM3. The possible conformers of TNDAIW are predicted to be more stable than epsilon-CL-20 based on the N-NO2 bond lengths. The impact and shock sensitivities of both the possible DA- and DP-TNDAIW are lower than the corresponding ones of epsilon-CL-20. TNDAIW with the possible conformers is estimated to be a promising novel high energy density explosive. | WU Yukai1, OU Yuxiang1, LIU Zhiguo1,2 , LIU Jinquan1, MENG Zheng1 & CHEN Boren1 1. School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China 2. School of Chemistry and Chemical Engineering, Henan University, Kaifeng 475001, China | 2004 | Science China Chemistry2004，47，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员