检索结果-南通市图书馆

Cobalt(Ⅱ) and Cadimium(Ⅱ) Metal-organic Frameworks Supported by a Multicarboxylate Ligand

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2019年第7期38卷 1164-1172页

作者： YANG hua CUI hua-Li wang ji-jiang CHEN Xiao-Li Laboratory of New Energy & New Function Materials of Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan?an University

Two metal-organic frameworks(MOFs) of formulae [Co7(L)3(4,4′-BPy)2(OH)2(H2O)6]·-4 H2O(1) and [Cd2(L)(2,2′-BPy)2]n(2, H4L = 5-(3,5-dicarboxybenzyloxy)-isophthalic acid,2,2′-BPy = 2,2?-bipyridine, 4,4′-BPy = 4,4′-bipyridine) were synthesized under solvothermal conditions. The structures of 1 and 2 were characterized by X-ray single-crystal diffraction *** complex 1, six cobalt atoms were connected by oxygen atoms to form a defect dicubane structure. The defect dicubane structures were further linked by Co(4,4?-BPy) units to generate a3-D network structure. Compound 2 displays a 2-D chain structure. The photoluminescent property of complex 2 is investigated. The results show the exclusive luminescence emission bands being originated from intraligand π-π^* transitions.

关键词： metal-organic framework multicarboxylate photoluminescent property

Experimental Study on the Sinking and Leveling of A Large-Capacity Offshore Wind Turbine Five-Bucket Foundation in Sand

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第4期38卷 586-601页

作者： LIAN ji-jian ZHU Hang GUO Yao-hua wang Hai-jun YU Tong-shun State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Tianjin University of Technology Tianjin 300384China College of Engineering Ocean University of ChinaQingdao 266100China

As offshore wind farms expand into deeper and farther ocean regions and the unit capacity of offshore wind turbines(OWTs)increases,there is a pressing need for a new foundation structure that can accommodate deep-sea conditions and support large capacities while maintaining economical and *** meet this goal of integrated transportation and one-step installation,a novel five-bucket jacket foundation(FBJF),with its suction installation and leveling methods in sand,has been proposed,analyzed and experimentally ***,seepage failure experiments of the FBJF at various depths were conducted,and a formula for calculating the critical suction of seepage failure suitable for the FBJF in sand was chosen and recommended for use with a range of values for the permeability coefficient ***,through leveling experiments of the FBJF at different depths,the maximum adjustable leveling angle during the sinking process was defined using seepage failure and the adjustable leveling angle of the foundation as control *** leveling control strategies were proposed and ***,an automatic sinking and leveling control system for the FBJF was developed and experimentally verified for feasibility.

关键词： offshore wind turbine(OWT) bucket foundation seepage failure suction installation

Analysis of Spherical Polyelectrolyte Brushes by Small Angle X-ray Scattering

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2014年第6期32卷 778-785页

作者： Xuan-ji Yu Wei-hua wang 李莉 Xu-hong Guo Zhi-min Zhou Fu-chen wang School of Chemical Engineering East China University of Science and Technology

Spherical polyelectrolyte brushes （SPBs） with PS core and poly（acrylic acid）（PAA） brushes were prepared and analyzed by SAXS in this article. A radial electron density profile of SPB was brought up, which fits well with the SAXS result and shows a core-shell structure. The effect of pH on SPB form was represented by SAXS and it proves that the chains of SPB will stretch in response to increased pH owning to the increased electrostatic repulsion. SPBs immobilized with magnetic nanoparticles or bovine serum albumin （BSA） were prepared and analyzed by SAXS as well. SAXS could characterize the changes of electron density inside brushes of SPBs due to the immobilization of magnetic nanoparticles or BSA. This provides significant supports for further application of immobilized metal nanoparticles or proteins.

关键词： SPB SAXS Nanoparticles.

Coupling effect of the conductivities of Li ions and electrons by introducing LLTO@C fibers in the LiNi0.8Co0.15Al0.05O2 cathode

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2021年第2期28卷 305-316页

作者： Hao-yang wang Xue Cheng Xiao-feng Li ji-min Pan Jun-hua Hu School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Center for International Cooperation on Designer Low-carbon&Environmental Materials(CDLCEM) Zhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute(ZMGI) Xingyang 450100China

To probe the coupling effect of the electron and Li ion conductivities in Ni-rich layered materials(LiNi0.8Co0.15Al0.05O2,NCA),lithium lanthanum titanate(LLTO)nanofiber and carbon-coated LLTO fiber(LLTO@C)materials were introduced to polyvinylidene difluoride in a *** enhancement of the conductivity was indicated by the suppressed impedance and *** 1 and 5 C,the cathodes with coupling conductive paths had a more stable cycling *** coupling mechanism was analyzed based on the chemical state and structure evolution of NCA after cycling for 200 cycles at 5 *** the pristine cathode,the propagation of lattice damaged regions,which consist of high-density edge-dislocation walls,destroyed the bulk integrity of *** addition,the formation of a rock-salt phase on the surface of NCA caused a capacity *** contrast,in the LLTO@C modified cathode,although the formation of dislocation-driven atomic lattice broken regions and cation mixing occurred,they were limited to a scale of several atoms,which retarded the generation of the rock-salt phase and resulted in a pre-eminent capacity *** NiO phase“pitting”occurred.A mechanism based on the synergistic transport of Li ions and electrons was proposed.

关键词： Ni-rich cathode coupling mechanism dislocation wall coaxial structure cation mixing

Subsurface macro-inclusions and solidified hook character in aluminum-killed deep-drawing steel slabs

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2014年第6期21卷 531-543页

作者： Xiao-xuan Deng Lin-ping Li Xin-hua wang Yun-qing ji Chen-xi ji Guo-sen Zhu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Shougang Research Institute of Technology Shougang Group

Subsurface macro-inclusions and hooks are detrimental to the surface quality of deep-drawing steel sheets. However, little is known about the relationship between macro-inclusions and hooks. Thus, in this work, two ultralow carbon （ULC） steel slabs and two low carbon （LC） aluminum-killed steel slabs were sampled to study the relationship between hooks and subsurface macro-inclusions, which were detected on the cross-sections of steel samples with an area of 56058 mm2 using an automated scanning electron microscopy/energy-disper-sive X-ray spectroscopy system. Results show that subsurface inclusions larger than 200 μm were almost entrapped by hook structures, whereas the location of other inclusions smaller than 200μm had no obvious dependence on the location of solidified hooks. Furthermore, the number density （ND） of subsurface inclusions larger than 200μm decreased from 0.02 to 0 cm-2 in ULC steel as the mean hook depth decreased from 1.57 to 1.01 mm. Similar trends were also observed in LC steel. In addition, the detected inclusions larger than 200μm were concentrated in the region near the slab center （3/8 width-5/8 width）, where hook depths were also larger than those at any other locations. Therefore, minimizing the hook depth is an effective way to reduce inclusion-induced sliver defects in deep-drawing steels.

关键词： low carbon steel aluminum-killed steel steel sheet deep drawing inclusions hooks

不同剂量阿替普酶治疗急性缺血性脑卒中伴入院高血糖患者的临床研究

在线全文

学校读者我要写书评

暂无评论

中国实用神经疾病杂志 2025年第1期28卷 37-41页

作者：雷蕾王飒姬利宋波华锋延安大学咸阳医院陕西延安712000

目的探讨不同剂量阿替普酶治疗急性缺血性脑卒中(AIS)伴入院高血糖患者的疗效及对患者预后的影响。方法选取2020-01—2022-12在延安大学咸阳医院接受阿替普酶静脉溶栓治疗的AIS伴入院高血糖患者186例,采用随机数表法分为标准剂量组(93例... 详细信息

目的探讨不同剂量阿替普酶治疗急性缺血性脑卒中(AIS)伴入院高血糖患者的疗效及对患者预后的影响。方法选取2020-01—2022-12在延安大学咸阳医院接受阿替普酶静脉溶栓治疗的AIS伴入院高血糖患者186例,采用随机数表法分为标准剂量组(93例)和小剂量组(93例)。2组患者均采用胰岛素进行降血糖处理,标准剂量组阿替普酶剂量0.9 mg/kg,最大剂量90 mg,小剂量组阿替普酶剂量0.6 mg/kg,最大剂量60 mg。比较2组患者的短期疗效、90 d预后情况、病死率以及出血事件发生率。结果2组患者治疗24 h后的总有效率以及治疗7 d后的短期预后良好率比较差异均无统计学意义(P>0.05)。2组患者的远期预后良好率比较差异无统计学意义(P>0.05)。小剂量组病死率低于标准剂量组(P<0.05),出血事件发生率低于标准剂量组(P<0.05)。结论与标准剂量相比,小剂量阿替普酶治疗AIS伴入院高血糖可降低患者的出血事件发生率以及病死率,使患者受益。

关键词：急性缺血性脑卒中阿替普酶静脉溶栓小剂量标准剂量出血风险

Free energy calculation of single molecular interaction using Jarzynski's identity method:the case of HIV-1 protease inhibitor system

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第3期28卷 891-903页

作者： De-Chang Li Bao-hua ji Biomechanics and Biomaterials Lab Department of Applied MechanicsBeijing Institute of TechnologyKey Laboratory.of Dynamics and Control of Flight VehicleMinistry of Education100081 BeijingChina

Jarzynski＇ identity （ji） method was suggested a promising tool for reconstructing free energy landscape of biomolecular interactions in numerical simulations and ex- periments. However, ji method has not yet been well tested in complex systems such as ligand-receptor molecular pairs. In this paper, we applied a huge number of steered molec- ular dynamics （SMD） simulations to dissociate the protease of human immunodeficiency type I virus （HIV-1 protease） and its inhibitors. We showed that because of intrinsic com- plexity of the ligand-receptor system, the energy barrier pre- dicted by ji method at high pulling rates is much higher than experimental results. However, with a slower pulling rate and fewer switch times of simulations, the predictions of ji method can approach to the experiments. These results sug- gested that the ji method is more appropriate for reconstruct- ing free energy landscape using the data taken from experi- ments, since the pulling rates used in experiments are often much slower than those in SMD simulations. Furthermore, we showed that a higher loading stiffness can produce higher precision of calculation of energy landscape because it yields a lower mean value and narrower bandwidth of work distri- bution in SMD simulations.

关键词： Molecular dynamics simulation. Single molecu-lar interaction ~ Molecular biomechanics ~ Steered moleculardynamics ~ Free energy calculation

Optical Torque Exerted on a Rotator under Illumination of a Vortex Beam

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2012年第6期29卷 145-148页

作者： LI Dong-hua PU ji-Xiong wang Xi-Qing College of Information Science&Engineering Huaqiao UniversityXiamen 361021 College of Physical Science and Technology Southwest Jiaotong UniversityChengdu 610031

We investigate the torque on a specially shaped rotator produced by a vortex *** formulas for the torque along x,y and z directions axe derived,and numerical calculation is *** is found that for the specially shaped rotator,the torque brought by the Laguerre-Gauss (LG) vortex beam is dependent upon the angle of the facet for each part of the rotator,and the topological charge of the vortex *** is shown that torque is generated from both the light momentum and orbital angular momentum (OAM) of the incident vortex beam,indicating that we can control the rotation of the rotator by modulating the OAM of the incident light beam.

关键词： vortex momentum shaped

New development of hydraulic fracturing technique for in-situ stress measurement at great depth of mines

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第6期15卷 665-670页

作者： Meifeng Cai hua Peng Hongguang ji School of Civil and Environmental Engineering University of Science and Technology Beijing Beijing 100083 China Research Institute of Geomechanics Beijing 100080 China

In-situ stress measurement using the hydraulic fracturing technique was made at Wanfu Coal Mine in Shandong Province, China. To solve problems caused by great measuring depth and extra thick overburden soil layers in the mine, a series of improved techniques were developed for the traditional hydraulic fracturing technique and equipment to increase their pressure-enduring ability and to ensure safe and flexible removal of the sealing packers with other experimental apparatus. Successful in-situ stress measurement at 37 points within 7 boreholes, which were mostly over 1000 m deep, was completed. Through the measurement, detailed information of in-situ stress state has been provided for mining design of the mine. The improved hydraulic fracturing technique and equipment also provide reliable tools for in-situ stress measurement at great depth of other mines.

关键词： hydraulic fracturing in-situ stress measurement coal mine measuring depth