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Coal measure gas system of the Middle Jurassic Xishanyao Formation， southern margin of the Junggar Basin， China

Journal of Earth Science 2023年

作者： Aobo Zhang shida Chen Dazhen Tang Shu Tao Shuling Tang yifan Pu Taiyuan Zhang School of Energy Resources， China University of Geosciences (Beijing) Coal Reservoir Laboratory of National Engineering Research Center of Coalbed Methane Development & Utilization

The composition and sedimentary controlling effect of the coal measure gas-bearing (CMG) system of the Jurassic Xishanyao Formation in the southern margin of the Junggar Basin (SJB) are analysed based on core observations， sample tests， and logging data. The results show that the lithological associations of the SJB can be classified into 6 types based on sediment supply strengths and sealing abilities， while the gas shows of CMG reservoirs vary greatly among different lithological associations. Due to the diversified coal-forming environment and multistage coal accumulation， superimposed CMG systems are generally developed in the SJB， and their types include: superimposed unattached CMG systems， multilayer unified CMG systems， and superimposed mixed CMG systems. Furthermore， sedimentary controls on the vertical and regional distributions of different types of CMG systems are discussed according to the sedimentary facies of single wells and well cross-sections and the corresponding data of well log， gas logging， and gas contents. Shore shallow lake environments in the Fukang， Miquan， and northern Liuhuanggou areas were favourable for forming superimposed unattached CMG systems. Braided river environments in the Houxia and the southern Liuhuanggou areas usually formed multilayer unified CMG systems. Braided river delta environments in the Manasi， Hutubi， and eastern Sikeshu areas generally developed multilayer unified CMG systems and superimposed mixed CMG systems. For different types of superimposed CMG systems， the number of gas-bearing units， coal seam gas content， vertical hydraulic connectivity and lateral continuity vary considerably， which makes it necessary to tailor the CMG co-production plan to the type of CMG system.

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An area based physical layer authentication framework to detect spoofing attacks

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Science China(Information Sciences) 2020年第12期63卷 197-210页

作者： Na LI shida XIA Xiaofeng TAO Zhiyuan ZHANG Xiaohui WANG National Engineering Laboratory for Mobile Network Technologies Beijing University of Posts and Telecommunications

In this paper, we propose an area-oriented authentication framework, which aims to provide a light-weight first authentication by reducing the complexity in acquiring and maintaining many different reference vectors as in the traditional one-by-one authentication framework. Under the proposed framework,we first derive the missing detection probability and the false alarm probability, respectively. Then we quantitatively evaluate the average risks that a spoofer is successfully detected or a legitimate user is falsely alarmed, at any position in a certain area. And correspondingly three kinds of areas are defined as the clear area where the spoofers prefer not to attack, the danger area where the spoofers have pretty high probabilities to attack successfully, and the warning area where the legitimate users are much likely to be falsely reported as attackers. These results depict the security situation distribution of a region, and provide useful insights for network operators to take proper following strategies. Finally, simulations are given to verify our analytical derivations and show the impacts of system parameters.

关键词： physical layer authentication light weight authentication security situation distribution spoofing area authentication

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作为印度主流意识形态的印度教民族主义及其影响

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世界宗教文化 2023年第6期 28-34页

作者：王世达中国现代国际关系研究院南亚所

印度教民族主义诞生于19世纪印度寻求民族独立的过程之中,20世纪上半叶快速发展,1947年印度独立之后一度沉寂直至70年代再度抬头。21世纪以来,印度教民族主义空前活跃,尤其是其政治代表印人党对印度中央和地方两级政权的掌控力空前提升... 详细信息

印度教民族主义诞生于19世纪印度寻求民族独立的过程之中,20世纪上半叶快速发展,1947年印度独立之后一度沉寂直至70年代再度抬头。21世纪以来,印度教民族主义空前活跃,尤其是其政治代表印人党对印度中央和地方两级政权的掌控力空前提升,并出台和推行了一系列激进的印度教右翼政策。印度教民族主义的影响不只限于印度内政,已经延伸到外交领域,对印度对外战略和政策的塑造力持续增强,其影响值得密切关注。

关键词：印度教民族主义印度人民党国民志愿团

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巴基斯坦大国外交调整透视

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现代国际关系 2023年第7期 124-142,146页

作者：王世达中国现代国际关系研究院南亚研究所

近来,中国的全天候战略合作伙伴——巴基斯坦的大国外交出现明显调整,突出表现在巴基斯坦对美和对俄政策发生重大变化,巴美俄三角关系从巴美独大、巴俄弱小的绝对不平衡状态转向巴美下滑、巴俄上升的相对动态平衡状态。同时,巴基斯坦对... 详细信息

近来,中国的全天候战略合作伙伴——巴基斯坦的大国外交出现明显调整,突出表现在巴基斯坦对美和对俄政策发生重大变化,巴美俄三角关系从巴美独大、巴俄弱小的绝对不平衡状态转向巴美下滑、巴俄上升的相对动态平衡状态。同时,巴基斯坦对印对华政策虽延续了巴印对抗、巴中友好的主基调,但也呈现出若干新变化与新趋势:虽然巴印关系总体紧张,但巴方积极管控危机,避免矛盾失控而引发战争和冲突;巴方一贯积极维护巴中友好关系,现阶段重点推进中巴经济走廊等务实合作。巴基斯坦本轮大国外交调整缘于内外多重因素:外部首推美国推进“印太战略”,同时乌克兰危机起到催化作用;内部主要源于巴领导层发生重大变动,以及国内面临严峻的政治经济挑战,亟需外部尤其是大国支持以改善国内形势。迄今,巴基斯坦的大国外交调整已在全球和地区层面产生了较为明显的地缘政治和安全影响,但限于国际局势、自身战略认知与国情制约,巴方运筹大国关系依然面临结构性挑战。

关键词：巴基斯坦大国外交美国 “印太战略”

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A Hybrid Algorithm for Optimizing Multi-Modal Functions

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Wuhan University Journal of Natural Sciences 2006年第3期11卷 551-554页

作者： Li Qinghua yang shida Ruan youlin College of Computer Science and Technology Huazhong University of Science and Technology Wuhan 430074Hubei China

A new genetic algorithm is presented based on the musical performance. The novelty of this algorithm is that a new genetic algorithm, mimicking the musical process of searching for a perfect state of harmony, which increases the robustness of it greatly and gives a new meaning of it in the meantime, has been developed, Combining the advantages of the new genetic algorithm, simplex algorithm and tabu search, a hybrid algorithm is proposed. In order to verify the effectiveness of the hybrid algorithm, it is applied to solving some typical numerical function optimization problems which are poorly solved by traditional genetic algorithms. The experimental results show that the hybrid algorithm is fast and reliable.

关键词： harmony genetic allgorithm simplex algorithm Tabu search

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巴基斯坦政权更迭折射社会力量变幻

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当代世界 2022年第5期 75-76页

作者：王世达中国现代国际关系研究院南亚所

2022年4月以来,巴基斯坦政局发生重大变化。时任巴基斯坦总理伊姆兰·汗4月10日在议会进行的不信任投票中被逼下台。11日,穆斯林联盟(谢里夫派)主席夏巴兹·谢里夫宣誓就任巴基斯坦新一任总理。巴基斯坦此次政权更迭表面上看是以正义运... 详细信息

2022年4月以来,巴基斯坦政局发生重大变化。时任巴基斯坦总理伊姆兰·汗4月10日在议会进行的不信任投票中被逼下台。11日,穆斯林联盟(谢里夫派)主席夏巴兹·谢里夫宣誓就任巴基斯坦新一任总理。巴基斯坦此次政权更迭表面上看是以正义运动党为首的执政党与以穆斯林联盟(谢里夫派)、人民党等为代表的联合反对派之间矛盾持续升级、不可调和的表现。

关键词：穆斯林联盟政权更迭不信任投票谢里夫巴基斯坦联合反对派人民党宣誓

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Simple Planar Structure Hydrogen Gas Sensor Device with Large Response

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稀有金属材料与工程 2006年第A3期35卷 120-123页

作者： Shinji Nakagomi Takashi shida yu Itsukaichi yoshihiro Kokubun Faculty of Science and Engineering Ishinomaki Senshu UniversityIshinomak 986-8580Japan

Hydrogen gas sensor device with simple planar structure based on p^+ silicon substrate with n-type epi-layer was fabricated only by using a lift-off technique of an evaporated metal *** device consists of Ohmic source and drain electrodes and platinum Schottky gate *** sensor device has a little similar property as ***-voltage characteristics between the source and drain of the device are sensitive to hydrogen *** voltage difference between in hydrogen ambient and oxygen ambient is about 2.3 volts for a constant current of 0.9 *** device can detect 0.4% hydrogen gas in *** on oxidation reaction of hydrogen on the surface of the platinum gate,hydrogen sensitivity of the device changes by the coexisting oxygen *** flow in the buried channel formed between the gate electrode and the p^+n *** was confirmed that the gate bias influences the *** current-voltage property changes also depending on the wiring method.

关键词： planar structure hydrogen sensor three terminals large response

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A Novel Thermomorphic System for Electrocatalytic Diels-Alder Reactions

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Chinese Journal of Chemistry 2019年第6期37卷 557-560页

作者： yasushi Imada Naoki shida yohei Okada Kazuhiro Chiba Department of Applied Biological Science Tokyo University of Agriculture and Technology3-5-8 Saiwai-choFuchuTokyo 183-8509Japan Department of Chemical Engineering Tokyo University of Agriculture and Technology2-24-16 Naka-choKoganeiTokyo 184-8588Japan

The discovery that lithium bis(trifluoromethane)sulfonamide (LiTFSI)/1-nitropropane (PrNO2) solution functions as a less polar alternative to lithium perchlorate (LiClO4)/nitromethane (MeNO2) solution has led to the development of a novel thermomorphic system for electrocatalytic Diels-Alder reactions. Methyl cyclohexane (Me-c-Hex) can form a monophasic condition with LiTFSI/PrNO2 solution at room temperature, enabling the use of hydrophobic dienophiles. After the electrochemical reaction, a biphasic condition can be formed at –50℃, where the cycloadducts are selectively recovered from the upper Me-c-Hex phase and the remaining lower LiTFSI/PrNO2 solution can be reused.

关键词： thermomorphic system electro catalytic Diels-Alder reaction electrochemistry synthetic methods cycloaddition

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Advanced 4D-bioprinting technologies for brain tissue modeling and study

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International Journal of Smart and Nano Materials 2019年第3期10卷 177-204页

作者： Timothy J.Esworthy.shida Miao Se-Jun Lee Xuan Zhou Haitao Cui yi y.Zuo Lijie Grace Zhang Department of Mechanical and Aerospace Engineering The George Washington UniversityWashingtonDCUSA Department of Mechanical Engineering University of Hawaii at ManoaHonoluluHIUSA Department of Medicine The George Washington UniversityWashingtonDCUSA Department of Biomedical Engineering The George Washington UniversityWashingtonDCUSA Department of Electrical and Computer Engineering The George Washington UniversityWashingtonDCUSA

Although the process by which the cortical tissues of the brain fold has been the subject of considerable study and debate over the past few decades,a single mechanistic description of the phenomenon has yet to be fully ***,two competing explanations of cortical folding have arisen in recent years;known as the axonal tension and the differential tangential expansion *** the present review,these two models are introduced by analyzing the computational,theoretical,materials-based,and cell studies which have yielded *** Four-dimensional bioprinting is presented as a powerful technology which can not only be used to test both models of cortical folding de novo,but can also be used to explore the reciprocal effects that folding associated mechanical stresses may have on neural ***,the fabrication of‘smart’tissue models which can accurately simulate the in vivo folding process and recapitulate physiologically relevant stresses are *** also provide a general description of both cortical neurobiology as well as the cellular basis of cortical *** discussion also entails an overview of both 3D and 4D bioprinting technologies,as well as a brief commentary on recent advancements in printed central nervous system tissue engineering.

关键词： 4D bioprinting smart materials brain cortical folding gyrification

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ZM6铸造镁合金表面斑点缺陷形成机理分析

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重庆工商大学学报（自然科学版） 2024年第3期41卷 51-57页

作者：杨明军林翰杨明波邵军谢懿何绍付马仕达李翔光贵州航天风华精密设备有限公司贵阳550000 重庆理工大学材料科学与工程学院重庆400050 中国兵器工业第五九研究所重庆400044

目的为探究ZM6铸造镁合金表面斑点缺陷产生的原因及其形成机理。方法通过扫描电子显微镜(SEM)对未经机加工和经机加工后的ZM6铸造镁合金表面不同形态的斑点缺陷进行形貌分析,并结合能量色散X射线谱(EDS)对斑点缺陷的化学成分进行检测,... 详细信息

目的为探究ZM6铸造镁合金表面斑点缺陷产生的原因及其形成机理。方法通过扫描电子显微镜(SEM)对未经机加工和经机加工后的ZM6铸造镁合金表面不同形态的斑点缺陷进行形貌分析,并结合能量色散X射线谱(EDS)对斑点缺陷的化学成分进行检测,最后耦合合金铸态组织和力学性能进行综合分析。结果未经机加工的ZM6铸造镁合金表面斑点缺陷呈深黑色,而经机加工后的ZM6铸造镁合金表面斑点缺陷呈白色,且部分白色斑点中心有一小块黑色区域。不过未经机加工和经机加工后的ZM6铸造镁合金表面斑点缺陷都呈现龟裂状、其与基体的过渡界面处均未发现任何空隙存在,且其主要成分均为Mg的氧化物或氢氧化物、同时含有Cl、K等由溶剂引入的杂质元素,但未经机加工的ZM6铸造镁合金表面斑点缺陷中Cl元素的含量相对较高,而经机加工后的ZM6铸造镁合金表面斑点缺陷中K元素的含量相对较高。值得指出的是,经机加工后的ZM6铸造镁合金表面白色斑点中黑色区域存在微小气孔。结论ZM6铸造镁合金表面斑点缺陷的产生是由Mg的化学腐蚀及电偶腐蚀造成的,而不是由氧化夹杂造成的。因此,通过加强ZM6铸造镁合金精炼效果以获得化学成分均匀的熔体是获得高质量构件的有效途径。

关键词：砂型铸造氧化夹杂斑点微结构氧化反应电偶腐蚀

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