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Slope structures and formation of rock–soil aggregate landslides in deeply incised valleys

Journal of Mountain Science 2020年第2期17卷 316-328页

作者： BAI yong-jian WANG Yun-sheng GE Hua TIE yong-bo State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of technologyChengdu 610059China Chengdu Center of China Geological Survey Chengdu 610081China

Rock–soil aggregate landslides(RSALs) are a common geological hazard in deeply incised valleys in southwestern China. Large-scale RSALs are widely distributed in the upper reaches of the Dadu River, Danba County, Sichuan Province, and are influenced by slope structure, which can be divided into open, lock, strip, and dumbbell types, as well as soil type and meso-structure, which can be classified as layered rock–soil aggregate, block-soil, and grainsoil. In this study, the evolution of four types of structures, such as layered-dumbbell, block-soil lock, banded block-soil, and block-soil open types, were analyzed by field surveys, surface and deep displacement monitoring, and Flac3 D. It was found that the Danba reach of the Dadu River showed incised valley through the evolution from wide to slow valley affected by internal and external geological processes since the Quaternary Glaciation. In the layered-dumbbell rock–soil aggregate, the main sliding pattern is multi-stage sliding at different depths. Circular sliding in the trailing edge and plane sliding along the bedrock in the front edge body occurin the block-soil-lock type aggregate. Large-scale multi-level and circular sliding over long distances occur in the banded block-soil aggregate. The blocksoil open type is stable, with only circular sliding occurring in local and shallow surfaces of the body. The monitoring and numerical simulation results further show that slope structure and regularity have diversified with RSALs. The results provide a basis for analyzing the stability mechanism of RSALs and preventing RSALs in deeply incised valleys.

关键词： Slope structures Formation evolution Rock–soil aggregate Deeply incised valleys

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Bimetal nanoparticles hybridized with carbon nanotube boosting bifunctional oxygen electrocatalytic performance

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Rare Metals 2022年第8期41卷 2616-2623页

作者： Chen Sun yong-Jie Zhao Xuan-Yi Yuan Jing-bo Li Hai-bo Jin Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing100081China Beijing Key Laboratory of Opto-Electronic Functional Materials&Micro-Nano Devices Department of PhysicsRenmin University of ChinaBeijing100872China

Developing bifunctional oxygen catalysts with high efficiency and low cost to replace platinum-group metal catalysts commonly utilized in metal-air batteries is critically *** this article,a convenient method to synthesis NiFe nanoparticles hybridized with N-doped carbon nanotube(NiFe@N-CNTs)is *** performance analysis indicates that Ni_(x)Fc_(1-x)@N-CNTs offers favorable oxygen reduction reaction(ORR)kinetics(onset potential(E_(onset))is 0.87 V and half-wave potential(E_(1/2))is0.84 V),together with excellent oxygen evolution reaction(OER)performance(an overpotential of 270 mV to drive10 mA·cm^(-2)).Contributed by the synergetic effect between NiFe alloy and N-CNTs,when being utilized as air cathode,rechargeable Zn-air batteries present superior cycling stability for over 150 *** research provides a universal strategy to synthesize the hybrids of intertwined carbon nanotube matrix loaded with alloy nanoparticles.

关键词： NiFe alloy Oxygen evolution reaction(OER) Oxygen reduction reaction(ORR) Zn-air batteries

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Synthesis and properties of potassium 5,5'-azobis(1-nitraminotetrazolate)：A green primary explosive with superior initiation power

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Chinese Chemical Letters 2017年第1期28卷 117-120页

作者： Ya-Nan Li bo-Zhou Wang Yuan-Jie Shu lian-Jie Zhai Sheng-yong Zhang Fu-Qiang Bi Yu-Chuan Li Key Laboratory of Fluorine&Nitrogen Chemicals Xi'an Modern Chemistry Research InstituteXi'an 710065China School Of Material Science&Engineering Beijing Institute of TechnologyBeijing 100081China

Potassium 5,5＇-azobis（1-nitraminotetrazolate）,（K2ABNAT）, a new green primary explosive, was synthesized via a safe and convenient synthetic procedure based on methylcarbazate and cyanogen azide. The compound was characterized by single-crystal X-ray diffraction, IR spectroscopy, Raman spectroscopy, multinuclear NMR spectroscopy, elemental analysis, and differential scanning calorimetry（DSC）. With the calculated（CBS-4M） heat of formation（617.0 kJ/mol） and the room temperature X-ray density（2.11 g/cm^3）, impressive values for the detonation parameters such as detonation velocity（8367 m/s） and pressure（31.5 GPa） were computed using the EXPLO5 program. The superior calculated energetic performance show it could serve as a green replacement for the widely used primary explosive,lead（II） azide, which contains toxic ingredient.

关键词： Energetic materials Tetrazole Azo compounds Nitroamines Primary explosives

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Molten-salt synthesis of tungsten oxide nanotubes:Morphological and gas sensitivity

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Chinese Science Bulletin 2008年第3期53卷 335-338页

作者： KANG MingYang CAO ChuanBaot XU XingYan lian bo Research Center of Materials Science Beijing Institute of Technology Beijing 10081 China

A very simple molten-salt method was used to synthesize WO3 nanotubes at moderate temperature(600 ℃).The outer and inner diameters of the WO3 nanotubes were about 100 nm and 30 nm,with a length of dozens of *** and XRD analyses showed that the WO3 nanotubes were single crystal,and had monoclinic structure with the axes preferentially aligned along the [011] *** photoluminescence and the gas sensitivity of the nanotubes had been tested,showing that the prod-ucts very well responded to acetone at 340 ℃.

关键词：氧化钨纳米管光致发光性能气敏性纳米结构

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高浓度有机废水“零排放”发展现状及趋势的文献计量学分析

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水处理技术 2025年第1期51卷 1-5,12页

作者：丁士元刘一明刘勇刘军侯立安天津大学地球系统科学学院天津300072 南京万德斯环保科技股份有限公司江苏南京211100 北京师范大学环境学院北京100875

近年来随着经济快速发展,化工行业产生大量高浓度有机废水,此类废水中有机污染物浓度高、污染物种类多、性质差异大、毒性大,存在巨大的环境风险。本文对Web of Science(WOS)核心合集数据库和中国知网(CNKI)核心论文数据库中的相关文献... 详细信息

近年来随着经济快速发展,化工行业产生大量高浓度有机废水,此类废水中有机污染物浓度高、污染物种类多、性质差异大、毒性大,存在巨大的环境风险。本文对Web of Science(WOS)核心合集数据库和中国知网(CNKI)核心论文数据库中的相关文献进行可视化处理,综述了国内外高浓度有机废水研究现状。该领域近十年来我国研究热点集中于高浓度有机废水的“零排放”、资源化利用、膜处理、生化-物化技术方面的研究。并结合现有问题从组合工艺高效处理废水与低成本资源化方向提出可行性建议,包括:1)针对性组合工艺发展,因地制宜实现高浓度有机废水高效、绿色、低价处理;2)开发新型水处理技术,实现低成本、低碳化、高效率工艺升级;3)提升资源化效率,实现水、盐、贵金属和高值有机物甚至是过程中产生热能的回收利用,提升低值废盐等的高值利用;4)模块化和智能化,结合人工智能等实现处理单元模块化、智能化等,升级环保产业新质生产力。

关键词：高浓度有机废水零排放膜处理法资源化

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Synthesis and Crystal Structure of 5-Methoxy- butyrolacto[3,4-b]-1-N-cyclohexylaziridine

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Chinese Journal of Structural Chemistry 2005年第8期24卷 921-924页

作者： LI Sen-Lan GUO Jin-bo YU Zhao-lian CHEN Qing-Hua Department of Chemistry Luoyang Normal College ChinaLuoyang 470022

The title compound, 5-methoxy-butyrolacto[3,4-b]-1-N-cyclohexylaziridine 1, has been synthesized via tandem Micheal addition and intramolecular nucleophilic substitution reactions of 5-methoxy-3-bromo-2（5H）-furanones 4 with primary amines 5, and structurally determined by single-crystal X-ray diffraction. Crystal data： C11H17NO3, Mr = 211.26, monoclinic system, space group P21/c, a = 17.800（3）, b = 5.3864（10）, c = 12.2571（10）A°, β = 90.449（3）°, V = 1175.1（3） A°^3, Z= 4, De= 1.194 g/cm^3, λ（MoKα） = 0.071073 nm, μ = 0.087 mm^-1 and F（000） = 456. The structure was refined to R = 0.0505 and wR = 0.1208 for 2579 observed reflections （I 〉 2σ（I））. The crystallographic results of molecule 1 show that the functionalized aziridine ring is fused with a lactone ring to form the component with [3.1.0] bicyclic skeleton.

关键词： 4-methoxybutenolide alkylaziridine biologic active molecule X-ray crystllography

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Synthesis and Crystal Structure of 2,3-Dihydroxymethyl-N-cyclohexylaziridine

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Chinese Journal of Structural Chemistry 2005年第8期24卷 917-920页

作者： GUO Jin-bo YU Zhao-lian LI Sen-Lan CHEN Qing-Hua Department of Chemistry Luoyang Normal College ChinaLuoyang 470022

The title compound, 2（S）,3（R）-dihydroxymethyl-N-cyclohexylaziridine 1, has been synthesized via tandem Micheal addition and internal nucleophilic substitution reactions of 5-methoxy-3-bromo-2（5H）-furanones 2 with cyclohexylamine 3 and subsequent reduction of intermediate 5. Its crystal structure was determined by single-crystal X-ray diffraction. Crystal data：C10H19NO2, Mr = 185.26, monoclinic system, space group P21/n, a = 8.0620（16）, b = 7.2013（14）, c= 18.555（4） A°, β= 102.30（3）°, V= 1052.5（4）A°^3, Z= 4, De= 1.169 g/cm^3, λ（MoKα） = 0.071073 nm,μ = 0.080 mm^- 1 and F（000） = 408. The structure was refined to R = 0.0439 and wR = 0.1178 for 1839 observed reflections （I 〉 2σ（I））. The crystallographic structure of 1 shows that the functionalized aziridine ring links two hyroxymethyl groups.

关键词： 2 3-dihydroxymethyl-N-cyclohexylaziridine biologic active molecule X-ray crystallography

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Cloning and RNA interference analysis of the salivary protein C002 gene in Schizaphis graminum

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Journal of Integrative Agriculture 2015年第4期14卷 698-705页

作者： ZHANG yong FAN Jia SUN Jing-rui CHEN Ju-lian State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant ProtectionChinese Academy of Agricultural Sciences

The full-length c DNA of functionally-unknown salivary protein C002 in Schizaphis graminum was cloned using rapid amplification of c DNA ends（RACE） and designated as Sg C002（Gen Bank accession no. KC977563）. It is 767 bp long and encodes a protein of 190 amino acid residues with a predicted mass of 21.5 k Da and a predicted cleavage site of N-terminal signal peptide between the 24 th and the 25 th residues. Sg C002 is specifically expressed in salivary gland with the highest level at the 2nd instar. Introducing Sg C002-specific 476-si RNA, but not 546-si RNA to aphids through artificial diet significantly suppressed Sg C002 expression. Silencing Sg C002 gene led to lethality of the aphid on wheat plants, but not on pure artificial diet. Our study demonstrated that artificial diet-mediated RNAi can be a useful tool for research on the roles of genes in aphid salivary gland, and also provided new insights into the characteristics of C002 in wheat aphids.

关键词： Schizaphis graminum salivary protein C002 c DNA clone si RNA

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A 20 μW 95 dB dynamic range 4th-order Delta-Sigma modulator with novel power efficient operational transconductance amplifier and resonator

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第6期12卷 486-498页

作者： Jian XU Xiao-bo WU Meng-lian ZHAO Jun-yi SHEN Institute of VLSI Design Zhejiang University Hangzhou 310027 China

A low power high performance Delta-Sigma modulator for portable measurement applications is presented. To reduce power consumption while maintaining high performance, a fully feedforward architecture with a comprehensive system-level design is implemented. As a key building block, a novel power efficient current mirror operational transconductance amplifier (OTA) with a fast-settling less-error switched-capacitor common-mode feedback (SC CMFB) circuit is introduced, and the effects of both gain nonlinearity and 1/f noise of OTA are discussed. A new method to determine the voltage gain of an OTA is also proposed. The bottom terminal parasitic effect of poly-insulator-poly (PIP) capacitors is considered. About an extra 20% of capacitance is added to the total capacitance load. A power and area efficient resonator is adopted to realize a coefficient of 1/90 for 50% power and 75% area reduction compared with conventional designs. The chip is implemented in a low cost 0.35 μm complementary metal oxide semiconductor (CMOS) process. The total power consumption is 20 μW with a 1.5 V supply, and the measured dynamic range (DR) is 95 dB over a 1 kHz bandwidth. Experimental results show that a high figure-of-merit (FOM) is achieved for the designed modulator in comparison with those from the literature.

关键词： Low power High performance Power efficient OTA and resonator Delta-Sigma modulator

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Tensile behavior and deformation mechanism of quenching and partitioning treated steels at different deforming temperatures

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Journal of Iron and Steel Research International 2017年第11期24卷 1104-1108页

作者： lian bo Luo Wei Li Yu Gong Li Wang Xue-jun Jin Institute of Advanced Steels and Materials School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Development and Application Technology of Automotive Steels Baosteel Research InstituteShanghai 201900China

The effects of deforming temperatures on the tensile behaviors of quenching and partitioning treated steels were investigated. It was found that the ultimate tensile strength of the steel decreased with the increasing temperature from 25 to 100 ℃, reached the maximum value at 300 ℃, and then declined by a significant extent when the temperature further reached 400 ℃. The total elongations at 100, 200 and 300 ℃are at about the same level. The steel achieved optimal mechanical properties at 300 ℃due to the proper transformation behavior of retained austenite since the stability of retained austenite is largely dependent on the deforming temperature. When tested at 100 and 200 ℃, the retained aus tenite was reluctant to transform, while at the other temperatures, about 10 vol. % of retained aus- tenite transformed during the tensile tests. The relationship between the stability of retained austenite and the work hardening behavior of quenching and partitioning treated steels at different deforming temperatures was also studied and discussed in detail. In order to obtain excellent mechanical properties, the stability of retained austenite should be carefully controlled so that the effect of transforma tion-induced plasticity could take place continuously during plastic deformation.

关键词： Quenching and partitioning treated steel Mechanical property Deforming temperature Retained austenite Work hardening behavior

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