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Search Results: 1 - 10 of 74587 matches for " YU Kai-ning~ "
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The Impact of Urbanization on Groundwater Recharge: a Case Study of Shijiazhuang City
城市化对地下水补给的影响——以石家庄市为例

YU Kai-ning,
于开宁

地球学报 , 2001,
Abstract: With the rapid urbanization, groundwater has been playing a more and more important role. The study on the impact of urbanization upon groundwater recharge is of great significance not only in studying the hydrologic cycle, supply-demand balance and groundwater overexploitation but also in preventing and controlling the deterioration of groundwater quality and in revealing the relationship between overexploitation and water quality deterioration, the two main problems in groundwater environment. The study on the interaction mechanism between urbanization and groundwater constitutes a typical example. In this paper, based on the analysis of the importance of groundwater in water supply of the city as well as the exploitation and utilization of groundwater, the author studied the change of groundwater recharge under the impact of urbanization, and then discussed the impact mechanism of urbanization on groundwater recharge. On such a basis, a frame-figure on the mechanism inducing the increment of groundwater recharge was constructed. The results show:① urbanization results in the increase of groundwater recharge;②the inducing of groundwater from the well-field around the city and surface water by exploitation of groundwater and the importing of new recharge sources that results from the leakage of water-supply and water-discharge systems of the city seem to be the important mechanism that induces the recharge increase of groundwater by urbanization.
Mechanism of Groundwater Recharge Increment Induced by Urbanization
城市化诱发地下水补给增量的机理分析

YU Kai-ning~,
于开宁
,娄华君,郭振中,李涛

资源科学 , 2004,
Abstract: The study on impact of urbanization on groundwater recharge has a very important significance, not only for studying the hydrologic cycle, supply-demand balance, groundwater overexploitation, but also for preventing and controlling the deterioration of groundwater quality, and for revealing the organic relation between overexploitation and water quality deterioration, the two main problems of groundwater environment. However, up to now, it has not been determined weather the urbanization development would result in the increase or decrease of groundwater recharge, and the impact mechanism of urbanization on groundwater recharge also has not been illustrated. The study on the interaction mechanism of urbanization and groundwater in Shijiazhuang City is a typical example. In this paper, based on the analysis of the importance of groundwater in water supply of the city, and the exploitation and utilization of groundwater, the authors studied the change of groundwater recharge under the impact of urbanization, and further discussed the impact mechanism of urbanization on groundwater recharge. Finally, a frame-figure on the mechanism inducing the increment of groundwater recharge was constructed. The results show: 1) urbanization results in the increase of groundwater recharge; 2) the inducing of groundwater from the well-field around city and surface water by exploitation of groundwater, and the importing of new recharge sources resulting from the leakage of water-supply and water-discharge systems of city, is the important mechanism inducing the recharge increase of groundwater by urbanization; 3) the new recharge sources resulting from the leakage of water-supply and water-discharge systems are one of the important components which should be considered fully in the calculation of groundwater recharge in the urban districts. This study supplies a kind of theory and new approach to study hydrological cycle and water resources in the urban districts.
The Ancient Soil and Palaeogeographic Environment of Niutuozhen Ge othermal Field,Hebei Province in Quaternary Period
河北省雄县牛驼镇地热田第四纪古土壤与古地理环境

REN Zhen-ji,YU Kai-ning,YAN Gui-fan,
任振纪
,于开宁,闫贵凡

地球学报 , 1999,
Abstract: According to the study on ancient soil,sporopollenan alysis,stratigrahic succession,and palaeomagnetic dating of the drill in Xiongx ian Geothermal field,Hebei province,the authors have discussed the palaeoclimate evolution in this area during Quaternary period.It is considered that during Qu aternary period the soil layers can be divided in two large zones,the palaeovege tation development had gone through four stages,and the distinct climate change of cold-warm-dry-wet had had sixteen times.
Double Weighted Average Method for Assessment of Groundwater Salt Pollution in Shijiazhuang City
石家庄市地下水盐污染评价——双权均值法

YU Kai-ning,CHEN Jing-sheng,GE Zheng-lin,
于开宁
,陈京生,葛正林

地球学报 , 2000,
Abstract: Groundwater salt pollution has been a prominent manifestation of deterioration of groundwater environment quality in Shijiazhuang city. This study can be regarded as an example of groundwater salt pollution. In this paper,five ordinary components,namely hardness,total dissolved solids, Cl - , SO 2- 4 and NO - 3 are selected as the assessment factors, and Double Weighted Average Method is used in the comprehensive assessment of groundwater salt pollution.This is a simple and new try with satisfactory result.
Elevated Frequencies of Circulating Th22 Cell in Addition to Th17 Cell and Th17/Th1 Cell in Patients with Acute Coronary Syndrome
Lei Zhang, Ting Wang, Xiao-qi Wang, Rui-zhi Du, Kai-ning Zhang, Xin-guang Liu, Dao-xin Ma, Shuang Yu, Guo-hai Su, Zhen-hua Li, Yu-qing Guan, Nai-li Du
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0071466
Abstract: Background Atherosclerosis is a chronic inflammatory disease mediated by immune cells. Th22 cells are CD4+ T cells that secret IL-22 but not IL-17 or IFN-γ and are implicated in the pathogenesis of inflammatory disease. The roles of Th22 cells in the pathophysiologic procedures of acute coronary syndrome (ACS) remain unclear. The purpose of this study is to investigate the profile of Th22, Th17 and Th17/Th1 cells in ACS patients, including unstable angina (UA) and acute myocardial infarction (AMI) patients. Design and Methods In this study, 26 AMI patients, 16 UA patients, 16 stable angina (SA) patients and 16 healthy controls were included. The frequencies of Th22, Th17 and Th17/Th1 cells in AMI, UA, SA patients and healthy controls were examined by flow cytometry. Plasma levels of IL-22, IL-17 and IFN-γ were measured by enzyme-linked immunosorbent assay (ELISA). Results Th22, Th17 and Th17/Th1 cells were significantly increased in AMI and UA patients compared with SA patients and healthy controls. Moreover, plasma IL-22 level was significantly elevated in AMI and UA patients. In addition, Th22 cells correlated positively with IL-22 as well as Th17 cells in AMI and UA patients. Conclusion Our findings showed increased frequencies of both Th22 and Th17 cells in ACS patients, which suggest that Th22 and Th17 cells may play a potential role in plaque destabilization and the development of ACS.
Design Investigation on Millimeter-Wave Ferrite Phase Shifter in Substrate Integrated Waveguide
Wenquan Che;Edward Kai-Ning Yung;Ke Wu;Xiaodong Nie
PIER , 2004, DOI: 10.2528/PIER03082801
Abstract: In this paper,the design idea and technique of the ferrite phase shifter in substrate integrated waveguide (SIW) has been reported. The characteristics of the millimeter-wave ferrite phase shifter have been firstly calculated analytically,and the relative parameters of the device have been decided on the basis of optimization. At the same time,the design procedure of transition from ferrite phase shifter in SIW to CPW has been introduced; the agreement between the simulation results of the final integrated structure and the experimental results of an equivalent model has shown the good performance of this integrated structure.
A first principle study on the geometry and the electronic structures of VC(001) relaxed surface
VC(001)弛豫表面构型与电子结构第一性原理研究

Zhang Yong-Fan,Ding Kai-Ning,Lin Wei,Li Jun-Qian,
章永凡
,丁开宁,林 伟,李俊篯

物理学报 , 2005,
Abstract: By using the first principle method, the geometry and electronic structures of the clean VC(001) surface are investigated. Similar to the TiC(001) surface, the relaxation of the VC(001) surface leads to the C and V atoms on the top layer move outward and inward, respectively. Results of band structure calculation show that the band structures of transition metal (001) surfaces can be well described by the rigid band model. For the VC(001) surface, the surface states are mainly located around 3 0eV below the Fermi level, and mainly originate from the 2p z orbital of C atom in the top layer. In addition, the surface states derived from the top layer V 3d orbitals are also observed near the Fermi level. Since these states contain significant contributions of those 3d orbitals vertical to the surface (3d 2 z and 3d xz /d yz ), which will play important roles in the surface reactions, it could be expected that the VC(001) surface exhibits different surface reactivity compared with the TiC(001) surface.
Impacts of Different Light Intensity on Morphology and Structure of Potamogeton crispus
不同光照条件对菹草外部形态与内部结构的影响

CHEN Xiao-Feng,WANG Qing-Ya,CHEN Kai-Ning,
陈小峰
,王庆亚,陈开宁

植物科学学报 , 2008,
Abstract: 通过受控试验,研究了4个光照处理(100%、50%、20%、10%的自然光)对菹草(Potamogeton crispus)外部形态与内部结构的影响.结果显示:(1)100%和50%自然光处理对菹草的总生物量影响不显著,20%和10%的自然光显著降低了菹草的总生物量.(2)在生物量分配方面,50%自然光处理的根冠比值显著低于其他3个处理组,表现出菹草对地上部分茎叶生物量的投资较多.(3)在50%自然光条件下,菹草的株高、植株叶片数、顶枝叶片数明显高于其他3个处理组的对应参数,说明适当的遮荫会促进菹草植株的生长;10%自然光下的各参数值均最小(除根/冠比值),表明已较严重地限制了菹草的正常生长.(4)20%和10%自然光的遮光处理增加了菹草的叶片厚度,100%、50%、20%和10%的自然光下分别为0.260、0.297、0.440、 0.306 mm.(5)100%自然光叶片的叶肉细胞没有形成发达通气组织,50%自然光的菹草叶肉细胞开始形成较发达的通气组织,通气组织中间隔分布有单层细胞组成的隔膜,20%和10%自然光的叶片中隔膜细胞破裂,形成了发达的通气组织;20%和10%自然光的叶片通气组织细胞面积显著大于100%和50%自然光处理组,均值分别为0.558 mm2、 0.284 mm2和0.108 mm2、 0.087 mm2.(6)20%自然光处理组根的表皮细胞中可以发现四端尖锐晶体存在,表明植物生长受到一定程度胁迫;50%自然光处理的根通气组织彼此相连,形成大的通气结构,而其它处理组皮层没有形成通气结构.综合上述研究结果表明,50%自然光处理较有利于菹草的生长发育.
DISSOLVED INORGANIC CARBON UPTAKE IN TWO SUBMERGED MACROPHYTES FROM TAIHU LAKE CHINA
太湖两种大型沉水植物无机碳利用效率差异及其机理

XIAO Yue-E,CHEN Kai-Ning,DAI Xin-Bin,XU Xiao-Ming,
肖月娥
,陈开宁,戴新宾,许晓明

植物生态学报 , 2007,
Abstract: 该文通过pH值漂移实验比较了太湖常见的两种沉水植物菹草(Potamogeton crispus)和马来眼子菜(P.malaianus)对无机碳利用效率的差异,并测定两者无机碳吸收关键酶——碳酸酐酶的活性,探讨了两者无机碳吸收效率差异的原因。根据太湖自然水体的无机碳条件设定了3种不同碱度条件,测定起点pH值和无机碳条件。不同碱度下pH值漂移变化和总无机碳/碱度比值的结果表明,两个种均能利用HCO3-,适应低无机碳条件。两者对HCO3-的吸收速率决定于其浓度大小,该离子浓度越大,光合速率越高。但是对HCO3-的吸收速率存在差异:马来眼子菜在各碱度下终点pH值显著高于菹草,整体光合速率较高。CO2-光合速率响应曲线表明,在高pH值(CO2受到限制)时,马来眼子菜对CO2亲和力较大。尽管菹草在pH值较低(6.5~7.0)时有相对较高的光合速率,但是基于太湖自然水体夏季高pH值(>8.5)条件,马来眼子菜具有更大的生长优势,成为优势种群。两者无机碳吸收速率的差异是造成它们生活史差异和时间生态位的一重要原因。同时,马来眼子菜碳酸酐酶活性明显高于菹草,表明在相同无机碳条件下,前者催化HCO3-与CO2之间的转化效率更高,这可能是造成两者无机碳吸收速率差异的原因。
Scattering characteristics of conducting cylinder coated with nonuniform magnetized ferrite
Hu Bin-Jie,Edward Yung Kai-Ning,Zhang Jun,Serge Toutain,
胡斌杰
,容启宁,张军,ToutainSerge

中国物理 B , 2005,
Abstract: An analytical technique, referred to as the scattering matrix method (SMM), is developed to analyse the scattering of a planar wave from a conducting cylinder coated with nonuniform magnetized ferrite. The SMM solution for the nonuniform ferrite coating can be reduced to the expressions for the scattering and penetrated coefficients in four particular cases: nonuniform magnetized ferrite cylinder, uniform magnetized ferrite-coated conducting cylinder, uniform ferrite cylinder as well as homogeneous dielectric-coated conducting cylinder. The resonant condition for the nonuniform ferrite coating is obtained. The distinctive differences in scattering between the nonuniform ferrite coating and the nonuniform dielectric coating are demonstrated. The effects of applied magnetic fields and wave frequencies on the scattering characteristics for two types of the linear profiles are revealed.
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