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Search Results: 1 - 10 of 34497 matches for " Zhou Zhenlin "
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CLONING OF THE Cd-RESISTANT GENE FROM PSEUDOMONAS SSP.
假单胞杆菌抗镉基因的克隆

Luo Jinxian,Zhou Zhenlin,Li Zhenlin,Hu Jinxin,
罗进贤
,周桢林,李镇林,胡晋新

环境科学学报 , 1988,
Abstract: 以pBR322为载体,将抗镉的假单胞杆菌R4染色体的抗镉基因克隆至大肠杆菌HB101,从5000个重组体中筛选出一株抗镉基因克隆株,命名为大肠杆菌HB101(pBC311)。重组质粒pBC311经PstⅠ酶解和琼脂糖凝胶电泳证实抗镉基因位于3.6kb长的PstⅠ片段上。克隆菌株可在含100μg/ml CdCl_2的L-肉汤中生长,其生长停滞期比受体大肠杆菌HB101短得多,说明克隆菌株含有抗镉基因。
砾质曲流河的沉积特点及成因:以秦皇岛大石河为例
Sedimentary Characteristics and Geneses of Pebbly Meandering River: A Case from Dashihe River in Qinghuangdao~Area

王家豪, 周江羽, 杨香华, 陈振林
Wang Jiahao
, Zhou Jiangyu, Yang Xianghua, Chen Zhenlin

地球科学(中国地质大学学报) , 2018, DOI: 10.3799/dqkx.2018.197
Abstract: 前人对河流沉积特征的总结主要针对砂质曲流河和砾质辫状河,但几乎未涉及砾质曲流河类型.以秦皇岛地区大石河北庄坨村-上庄沱镇河段为例,通过现代沉积学考察,描述了砾质曲流河的地貌单元和沉积特点,总结了沉积序列和沉积模式,探讨了该类河流的成因机制.其地貌单元包括高弯曲的单河道、交替分布于河道两侧的凹岸-凸岸、流槽和河漫滩.受两侧山地的近物源供给,自下而上发育河床底部滞留沉积和砾质曲流沙坝、砂砾质流槽、砂质河漫滩沉积,具叠瓦状构造和大型板状-楔状-槽状交错层理,总体呈现正旋回序列和不典型的二元结构.砾质曲流河在地貌形态上与砂质曲流河类似,但在水动力条件、沉积物岩性组成和沉积序列方面与砾质辫状河类似,表现为双重性质.依据研究区3级河流阶地,结合该类河型在现今山地普遍分布的特点,分析指出砾质曲流河的成因在于区域构造抬升和河流强烈侵蚀下切.本文研究对河型分类、分布及控制因素的认识带来了挑战.鉴于砾质曲流河响应于区域构造抬升的特点,地史时期该类河型的识别必然对造山运动具有重要指示意义.
The patterns of sandy meandering river and pebbly braided river had been well documented on their sedimentary characteristics, but the pattern of pebbly meandering river had been rarely previously reported. Based on modern sedimentary investigations on the Xiaobangshuiya-Shangzhuangtuo stretch of Dashihe River in Qinghuangdao Area taken as a typical example of pebbly meandering river, the geomorphology units and sedimentary characteristics are described, and then the depositional succession and model are summarized to insight into its geneses in this paper. The geomorphology units include a single highly-sinuous channel, convex and concave banks alternately locating at the two sides of the channel, launder and small-scale flood plains. Sourced by the nearby mountainous provenance, the sediments are identified as lags deposits, pebbly point-bar deposits, gravelly launder deposits and sandy flood plain deposits with imbricate structure, and large-scale tabular, wedge-shaped and trough cross-bedding from bottom to top, presenting a fining-upward succession called as an atypical dual-structure that is constructed by coarse sediments in the lower and fine sediments in the upper. Accordingly, the pebbly meandering river is featured with geomorphology units similar to a sandy meandering river, and with hydrodynamic conditions, lithologic compositions and depositional succession similar to a pebbly braided river, so are called as dual properties. Integrating with the pebbly meandering river widely occurring in modern mountainous regions, three-graded river terraces in the study area indicated that the river pattern of pebbly meandering river is attributed to regional tectonic uplifts and river’s intense erosional actions. The study in this paper brings a challenge on understanding the classification, distribution and control factors of river patterns. Identifications of geo-historical pebbly meandering rivers should be significant to determine orogenic movements due to their close response to regional tectonic~uplift
A thermodynamically consistent phase-field model for two-phase flows with thermocapillary effects
Zhenlin Guo,Ping Lin
Physics , 2014, DOI: 10.1017/jfm.2014.696
Abstract: In this paper, we develop a phase-field model for binary incompressible (quasi-incompressible) fluid with thermocapillary effects, which allows for the different properties (densities, viscosities and heat conductivities) of each component while maintaining thermodynamic consistency. The governing equations of the model including the Navier-Stokes equations with additional stress term, Cahn-Hilliard equations and energy balance equation are derived within a thermodynamic framework based on entropy generation, which guarantees thermodynamic consistency. A sharp-interface limit analysis is carried out to show that the interfacial conditions of the classical sharp-interface models can be recovered from our phase-field model. Moreover, some numerical examples including thermocapillary convections in a two-layer fluid system and thermocapillary migration of a drop are computed using a continuous finite element method. The results are compared to the corresponding analytical solutions and the existing numerical results as validations for our model.
Analysis on Mistakes which Occur Often in Writing English Notes of Figures and Tables
图表英文注释常见差错探析

ZHANG ZhenLin,
张震林

中国科技期刊研究 , 2007,
Abstract: 分析了科技期刊图表英文注释中的常见差错,认为这些差错的主要表现有省略错误、动词词义和语法功能误用、主谓语搭配不当、标点符号使用混乱等。同时,探讨了图表英文注释差错处理办法。
Atomic layer engineering of perovskite oxides for chemically sharp heterointerfaces
Woo Seok Choi,Christopher M. Rouleau,Sung Seok A. Seo,Zhenlin Luo,Hua Zhou,Timothy T. Fister,Jeffrey A. Eastman,Paul H. Fuoss,Dillon D. Fong,Jonathan Z. Tischler,Gyula Eres,Matthew F. Chisholm,Ho Nyung Lee
Physics , 2012, DOI: 10.1002/adma.201202691
Abstract: Advances in synthesis techniques and materials understanding have given rise to oxide heterostructures with intriguing physical phenomena that cannot be found in their constituents. In these structures, precise control of interface quality, including oxygen stoichiometry, is critical for unambiguous tailoring of the interfacial properties, with deposition of the first monolayer being the most important step in shaping a well-defined functional interface. Here, we studied interface formation and strain evolution during the initial growth of LaAlO3 on SrTiO3 by pulsed laser deposition, in search of a means for controlling the atomic-sharpness of the interfaces. Our experimental results show that growth of LaAlO3 at a high oxygen pressure dramatically enhances interface abruptness. As a consequence, the critical thickness for strain relaxation was increased, facilitating coherent epitaxy of perovskite oxides. This provides a clear understanding of the role of oxygen pressure during the interface formation, and enables the synthesis of oxide heterostructures with chemically-sharper interfaces.
CHILDREN''''S HUMAN FIGURE DRAWINGS: THE DEVELOPMENT OF SIZE SCALING AND ITS INFLUENTIAL FACTORS
年幼儿童人物画结构变化及其影响因素

WANG Zhenlin,
王贞琳

心理学报 , 2000,
Abstract: One of the most prominent characteristics of children's human figure drawing is disproportion. Over 300 children aged from 4.5 to 6.5 panicipated in this research. The results showed that the trunk/head ratios of all participants, averaged 1.3, increased from 4.5 to 5.5, then decreased until 6 and increased again on free drawing condition. Due to the relatively stable size of the head, the variation of the ratio was mostly caused by the variation of the size of the trunk, which is deemed pertinent to the cognitive development of body structure. On model drawing condition, the trunk/head ratio was significantly greater than that of free drawing, although the direction of variation was the same except ages of 4.5 to 5. Changing the order of drawing and exaggerating the function of body parts can also affect the ratio.
A numerical method for the quasi-incompressible Cahn-Hilliard-Navier-Stokes equations for variable density flows with a discrete energy law
Zhenlin Guo,Ping Lin,John S. Lowengrub
Physics , 2014, DOI: 10.1016/j.jcp.2014.07.038
Abstract: In this paper, we investigate numerically a diffuse interface model for the Navier-Stokes equation with fluid-fluid interface when the fluids have different densities \cite{Lowengrub1998}. Under minor reformulation of the system, we show that there is a continuous energy law underlying the system, assuming that all variables have reasonable regularities. It is shown in the literature that an energy law preserving method will perform better for multiphase problems. Thus for the reformulated system, we design a $C^0$ finite element method and a special temporal scheme where the energy law is preserved at the discrete level. Such a discrete energy law (almost the same as the continuous energy law) for this variable density two-phase flow model has never been established before with $C^0$ finite element. A Newton's method is introduced to linearise the highly non-linear system of our discretization scheme. Some numerical experiments are carried out using the adaptive mesh to investigate the scenario of coalescing and rising drops with differing density ratio. The snapshots for the evolution of the interface together with the adaptive mesh at different times are presented to show that the evolution, including the break-up/pinch-off of the drop, can be handled smoothly by our numerical scheme. The discrete energy functional for the system is examined to show that the energy law at the discrete level is preserved by our scheme.
A three dimensional field formulation, and isogeometric solutions to point and line defects using Toupin's theory of gradient elasticity at finite strains
Zhenlin Wang,Shiva Rudraraju,Krishna Garikipati
Physics , 2015,
Abstract: We present a field formulation for defects that draws from the classical representation of the cores as force dipoles. We write these dipoles as singular distributions. Exploiting the key insight that the variational setting is the only appropriate one for the theory of distributions, we arrive at universally applicable weak forms for defects in nonlinear elasticity. Remarkably, the standard, Galerkin finite element method yields numerical solutions for the elastic fields of defects, that when parameterized suitably, match very well with classical, linearized elasticity solutions. The true potential of our approach, however, lies in its easy extension to generate solutions to elastic fields of defects in the regime of nonlinear elasticity, and even more notably for Toupin's theory of gradient elasticity at finite strains (Arch. Rat. Mech. Anal., 11, 385, 1962). In computing these solutions we adopt recent numerical work on an isogeometric analytic framework that allowed the first three-dimensional solutions to general boundary value problems of Toupin's theory (Rudraraju et al. Comp. Meth. App. Mech. Engr., 278, 705, 2014). We present exhaustive solutions to point defects, edge and screw dislocations, as well as a study on the energetics of interacting dislocations.
Stage II/III Rectal Cancer Patients Benefit from Extremely Early Initiation of Postoperative Adjuvant Chemotherapy: A Retrospective Study  [PDF]
Liuniu Xiao, Li Zhu, Yingming Chen, Zhenlin Hou, Lingwei Jia, Junbo Hu, Yongdong Feng
Journal of Cancer Therapy (JCT) , 2019, DOI: 10.4236/jct.2019.101004
Abstract: Background: For Stage II/III rectal cancer patients, curative resection is the primary treatment, prescribing of postoperative adjuvant chemotherapy (PAC) is regarded as a standard therapy. The interval between surgery and the initiation of PAC is usually within 8 weeks. However, the optimal cut-off is still controversial. This study aimed to explore the impact of extremely early initiation of PAC for II/III rectal cancer. Methods: Patients with Stage II/III rectal cancer treated from January 2013 to December 2015 were retrospectively collected at the Department of Tongji Hospital. According to the starting point of PAC, patients were categorized into two groups: extremely early group (The interval of PAC ≤ 2 weeks) and normal group (The interval of PAC within 3 - 5 weeks). For the sake of evaluating the effectiveness of different intervals, Overall Survival rate (OS), Progress-Free Survival rate (PFS) and Recurrence or Metastasis Rate (RMR) were analyzed, as well as the Quality of Life Score. To estimate the safety of the extremely early PAC, we evaluated the first post chemotherapy adverse reactions and defecation ability, and analyzed the variance laboratory indexes around the first postoperative adjuvant chemotherapy. Results: A total of 267 patients were included in this study. Compared to normal group (192 cases), extremely early group (75 cases) of patients attained a better tendency of OS and PFS, although there were no significant statistical differences (OS: P = 0.0930; PFS: P = 0.1058). However, the RMR was significant lower (P = 0.0452) and the Quality of Life Score was significantly higher (P = 0.0090) in extremely early group. Multivariate analysis also showed that extremely early group had better defecation ability (P = 0.0149) and less side reactions of post
Electrocatalytic dechlorination of 2,4,5-trichlorobiphenyl using an aligned carbon nanotubes electrode deposited with palladium nanoparticles
Shuo Chen,ZhenLin Qin,Xie Quan,YaoBin Zhang,HuiMin Zhao
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-0003-z
Abstract: Palladium loaded carbon nanotubes cathode with well-aligned nanotubes array was successfully fabricated on a titanium foil (Pd/CNTs/Ti) using a chemical vapor deposition technique and subsequent electrochemical deposition method. Pd particles were well dispersed on CNTs wall surfaces with average sizes no more than 20 nm, in most cases around 10 nm. Experiments for dechlorination of 2,4,5-trichlorobiphenyl (PCB 29) in methanol/water solution were carried out for the first time using Pd/CNTs/Ti cathode for investigation of its performance in electrocatalytic dechlorination of PCBs. Results show that Pd/CNTs/Ti presented better dechlorination efficiency (up to 90% in 6 h) than Pd/Ti and Pd/graphite cathodes owing to unique properties owned by CNTs, which benefited enhanced dechlorination of PCB 29. Complete dechlorination for PCB 29 was observed and biphenyl was identified to be final dechlorination product. The amount of Pd loading, cathode potential, and electrolytes were found to be key factors influencing dechlorination performance.
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