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Combined control of fluid adsorption capacity and initial permeability on coal permeability

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International Journal of Coal Science & Technology 2022年第6期9卷 127-137页

作者： Xiaolei Liu Jianping wei guoying wei Caifang Wu Cao Liu Xiaoming Ni State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic University454000 JiaozuoHenanChina College of Safety Science and Engineering Henan Polytechnic University454000 JiaozuoHenanChina State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization 454000 JiaozuoHenanChina Key Laboratory of Coalbed Methane Resource and Reservoir Formation Process Ministry of EducationSouth Jiefang Road221008 XuzhouJiangsuChina Collaborative Innovation Center of Coalbed Methane(Shale Gas)in Central Plains Economic Zone 454000 JiaozuoChina

The variations of strain and permeability of coal were systematically studied through the physical simulation of N2 and water *** effects of fluid adsorption capacity and initial permeability on strain,permeability and the dominant effect of pore pressure were *** adsorption strain and strain rate of coal during water injection are significantly higher than those during N2 *** edge of free adsorption exists in the early phase of N2 and water injection,which is related to fluid *** this boundary,the strain rate and pore pressure are ***,the injec-tion time of initial stage accounts for about 20%of the total injection time,but the strain accounts for 70%of the total *** water injection,this boundary is about half of water saturation of ***,the influence of pore pressure on permeability is complex,which is controlled by adsorption capacity and initial permeability of *** the initial permeability is large enough,the effect of adsorption strain on permeability is relatively weak,and the promoting effect of pore pressure on fluid migration is ***,the permeability increases with increasing pore *** the initial permeability is relatively low,the pore pressure may have a dominant role in promoting fluid migration for the fluid with weak adsorption ***,for the fluid with strong adsorption capacity,the adsorption strain caused by pore pressure may play a leading role,and the permeability reduces first and then ascends with increasing pore pressure.

关键词： Initial permeability Adsorption capacity Free adsorption Pore pressure Coal strain

Preparation of CoP films by ultrasonic electroless deposition at low initial temperature

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Progress in Natural Science:Materials International 2014年第3期24卷 232-238页

作者： Yundan Yu Zhenlun Song Hongliang Ge guoying wei Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences College of Materials Science and Engineering China Jiliang University

Electroless deposition technology has been considered as a kind of common ways to obtain cobalt alloy films. However, in order to get cobalt alloy films, high temperature(353 K) is necessary during the electroless deposition process which will increase costs and energy consumption. Ultrasonic was introduced during electroless plating process to obtain cobalt alloy films at lower initial temperature. It was found that the cobalt thin films could be prepared at lower initial temperature(323 K) with the introduction of ultrasonic. Therefore, different powers of ultrasonic were applied during the electroless deposition process to prepare CoP thin films on copper substrates from an alkaline bath in this investigation. The effects of different powers of ultrasonic on deposition rate, surface morphology, anticorrosion performance and magnetic property of films were studied. It was found that the deposition rate increased gradually with the rise in ultrasonic powers due to cavitation phenomenon. All the CoP films presented the typical spherical nodular structures with the impact of ultrasonic. Smaller and regular shaped structures could be observed when the films were deposited with higher power of ultrasonic which contributed directly to enhancement of anticorrosion performance. Saturation magnetization and coercivity of thin films increased gradually with the rise in ultrasonic powers during the electroless deposition process due to the higher amounts of cobalt.& 2014 Chinese Materials Research Society. Production and hosting by Elsevier B.V. All rights reserved.

关键词： Ultrasonic Electroless deposition Magnetic thin films CoP films

Effect of magnetic fields on pulse plating of cobalt films

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Rare Metals 2012年第2期31卷 125-129页

作者： Yu, Yundan Li, wei Lou, Junwei Ge, Hongliang Sun, Lixia Jiang, Li wei, guoying College of Material Science and Engineering China Jiliang University Hangzhou 310018 China

Magnetic fields parallel to the electrodes were introduced during a pulse plating process to obtain cobalt thin films from alkaline baths. Ef-fects of different magnetic intensities on the composition, microstructure, and magnetic properties of cobalt thin films were investigated. It was found that the deposition speed increased gradually with the increase of magnetic intensity. Almost all of the deposited films were crys-talline and showed Co(002), Co(100) peaks. With the rise on the magnetic intensity, the intensity of Co (002) peak raised gradually. Mag-netic fields would induce cobalt growing along (002) orientation. The films were densely covered with typical nodular structure. Films of smaller grain size and smooth surface could be formed under high magnetic intensity (1 T) as a result of magnetic force and MHD effects. Moreover, higher magnetic intensity induced larger saturation magnetization and lower coercivity. With the rise on magnetic intensity, cobalt contents in the films increased gradually, which led to the rise of saturation magnetization.

关键词： pulse plating magnetic field magnetization cobalt thin films

Magnetic performance and corrosion resistance of electroless plating CoWP film

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Rare Metals 2012年第3期31卷 264-271页

作者： Jiang, Li Pan, Shanshan Lu, Jianbiao Ke, Xin He, Wenhao Yu, Yundan wei, guoying Ge, Hongliang College of Materials Science and Engineering China Jiliang University Hangzhou 310018 China Zhejiang Keda Magnetoelectricity Limited Company Huzhou 313200 China

The CoWP film with good magnetic performance and corrosion resistance was electrolessly plated from alkaline solution. The technical parameters of the electroless plating system were optimized. When the pH value of electroless plating solution was 11.0 and the reducing agent (NaH2PO2) content was 0.4 mol L 1, the target chemical reactions proceeded in the electroless plating solution smoothly with negligible interference and side effects. CoWP film prepared under optimal deposition condition contained more hexagonal close-packed (hcp) cobalt (ε-Co) of [110] and crystallographic orientation of Co [002]. VSM analysis reveals that the saturation magnetization of the CoWP film is 100～220 Am2 kg 1 and coercivity is (2.87～4.38)×104 A·cm 1. The corrosion behavior of CoWP film in 3.5% NaCl aqueous solution was studied by electrochemical experiments. The results prove that the corrosion resistance of the CoWP film deposited under the optimal depo-sition condition exhibites relatively lower corrosion current of (3.054～3.162)×10 6 A·cm 2. The surface morphology analysis indicates that the film is smooth and composed of regular-shaped crystallites.

关键词： CoWP film corrosion magnetic microstructure

Early Stages of CeO_(2) Thin-film Nucleation and Growth with Photo Irradiation

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Chemical Research in Chinese Universities 2021年第3期37卷 696-703页

作者： JIN Tongzheng JIANG Xinyi YANG Yumeng ZHU Benfeng LIU Jiao JIANG Li wei guoying ZHANG Zhao College of Materials and Chemistry China Jiliang UniversityHangzhou310018P.R.China Department of Chemistry Zhejiang UniversityHangzhou310027P.R.China College of Chemistry and Chemical Engineering Hunan UniversityChangsha410082P.R.China

In this paper,the early stages of nucleation and photoirradiation growth of CeO_(2) thin films have been *** voltammetry,chronoamperometry and scanning electron microscopy were used to analyze the nucleation process of CeO_(2) thin films deposited on the anode with photo *** results show that the anodic deposition process with photo illumination is controlled by *** with the dark state,photo illumination mainly contributed to increase the current density of the three-dimensional nucleation process,because photo illumination is helpful to create active sites and accelerate the nucleation progress on the surface that a thin ceria film has been ***-dimensional nucleation process mainly exists within the initial 2 s,and then only three-dimensional instantaneous nucleation process continues,which may be the main reason why the thickness of the CeO_(2) film can continue to grow with photo illumination but not in the dark *** the deposition overpotential can promote two-dimensional nucleation and growth rate,whilst when the potential exceeds 0.65 V,three-dimensional current density *** limiting factor at that time may be the diffusion rate of cerium ions in the solution towards the electrode substrate.

关键词： Photo illumination Anodic electrodeposition CeO_(2)film Nucleation and growth

A novel procedure for pollen-based quantitative paleoclimate reconstructions and its application in China

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Science China Earth Sciences 2017年第11期60卷 2059-2066页

作者： CHEN JianHui LV FeiYa HUANG XiaoZhong H.John B.BIRKS Richard J.TELFORD ZHANG ShengRui XU QingHai ZHAO Yan WANG HaiPeng ZHOU AiFeng HUANG wei LIU JianBao wei guoying Key Laboratory of West China's Environmental System(Ministry of Education) College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Department of Biology and Bjerknes Centre for Climate Research University of BergenN-5020 BergenNorway Institute of Nihewan Archaeology Research Hebei Normal UniversityShijiazhuang 050024China Institute of Geographic Science and Natural Resources Research Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China

Traditionally, the evaluation of pollen-based quantitative paleoclimate reconstructions focuses on the ability of calibration sets to infer present climatic conditions and/or the similarity between fossil and modem assemblages. Objective criteria for choosing the most appropriate climate parameter（s） to be reconstructed at a specific site are thus lacking. Using a novel approach for testing the statistical significance of a quantitative reconstruction using random environmental data, in combination with the advantageous large environmental gradients, abundant vegetation types and comprehensive modem pollen databases in China, we describe a new procedure for pollen-based quantitative paleoclimatic reconstructions. First, the most significant environmental variable controlling the fossil pollen assemblage changes is identified. Second, a calibration set to infer changes in this targeted variable is built up, by limiting the modem ranges of other environmental variables. Finally, the pollen-based quantitative reconstruction is obtained and its statistical significance assessed. This novel procedure was used to reconstruct the mean annual precipitation （Pann） from Gonghai Lake in the Lvliang Mountains, and Tianchi Lake in the Liupan Mountains, on the eastern and western fringe of the Chinese Loess Plateau, respectively. Both Pann. reconstructions are statistically significant （p〈0.001）, and a sound and stable correlation relationship exists in their common period, showing a rapid precipitation decrease since 3300 cal yr BP. Thus, we propose that this procedure has great potential for reducing the uncertainties associated with pollen-based quantitative paleoclimatic reconstructions in China.

关键词： Pollen Quantitative reconstructions Statistical significance Marginal areas of the Asian summer monsoon

My Opinion of the Unbalance in "Gender Ecology"

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My Opinion of the Unbalance in "Gender Ecology"

北京论坛（2004）文明的和谐与共同繁荣

作者： wei guoying Women’s Studies Center of Peking University

Male, female and the environment form a compound ecosystm, in which the harmony between genders, nature and society is the key element to maintain the ecosystem balance. Hereinto the harmony between the quantity, quality and the developing situation of genders is the primary element to keep the ecosystem concordant. The first reason is special society and genders are always built upon the ground of special natural surroundings and special regional condition. The second reason is special social culture will shape the construction of genders and form the special gender culture, which will react to the social surroundings and culture. The third reason is that gender ecosystem is enslaved to nature and society, which balance needs both the equilibrium of gender quantity and the equality of gender quality. In short, the gender ecosystem is a changing and evaluative system, which always move from unbalance to balance and from lower patterns to upper patterns .In this ecosystem the interdependence, energy change and compensation between genders and surroundings has the function to keep the system evolute. So, it will bring severe aftermath when the gender ecosystem loses its balance. In order to keep the gender ecosystem’s balance and to avoid the negative aftermath, measures should be taken to change the traditional bearing notion such as "male is better" and to create new gender ecosystem criterion. The available measures include making government policy and social intervention to build a harmonious and balanced gender ecosystem.

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煤体钻孔瓦斯有效抽采半径判定技术

辽宁工程技术大学学报（自然科学版） 2013年第6期32卷 754-758页

作者：魏国营秦宾宾河南理工大学安全科学与工程学院河南焦作454000 河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地河南焦作454002

为研究瓦斯矿井本煤层准确测定瓦斯有效抽采半径问题,提出了利用吨煤瓦斯抽采量计算钻孔瓦斯有效抽采半径的测定方法.基于瓦斯钻孔衰减负指数规律建立钻孔瓦斯抽采模型,解算出吨煤瓦斯抽采量,并与其煤层原始瓦斯含量对比,得出煤层残存... 详细信息

为研究瓦斯矿井本煤层准确测定瓦斯有效抽采半径问题,提出了利用吨煤瓦斯抽采量计算钻孔瓦斯有效抽采半径的测定方法.基于瓦斯钻孔衰减负指数规律建立钻孔瓦斯抽采模型,解算出吨煤瓦斯抽采量,并与其煤层原始瓦斯含量对比,得出煤层残存瓦斯含量Wc和抽采率η,以此判断钻孔瓦斯有效抽采半径,只有同时满足{Wc≤8m3/t∩η≥30%},才为钻孔瓦斯有效抽采半径.研究结果表明:随着预抽时间延长,钻孔瓦斯有效抽采半径逐渐增大,直至极限抽采半径.通过工程实践,分析了不同时间的有效抽采半径,为瓦斯矿井抽采工作提供了可靠的抽采参数,具有实际应用价值.

关键词：瓦斯有效抽采半径指标吨煤抽采量抽采率瓦斯含量瓦斯流量 ANSYS

不同晶形石盐沉积生长特征及对包裹体温度的影响

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地质学报 2022年第4期96卷 1469-1477页

作者：冯阵东吴伟周永刘惟庆魏国营贾天让河南理工大学安全科学与工程学院河南焦作454003 河南理工大学资源环境学院河南焦作454003

石盐晶体生长过程中捕获流体包裹体,利用冷冻测温法得到的均一温度信息与古水温存在良好的相关性。在部分地区,利用包裹体最大均一温度评价古气候时,温度数据与孢粉学反映的气候特征存在冲突,不同晶形的石盐沉积特征,及其晶体条纹内包... 详细信息

石盐晶体生长过程中捕获流体包裹体,利用冷冻测温法得到的均一温度信息与古水温存在良好的相关性。在部分地区,利用包裹体最大均一温度评价古气候时,温度数据与孢粉学反映的气候特征存在冲突,不同晶形的石盐沉积特征,及其晶体条纹内包裹体温度代表的地质含义需进一步探讨。笔者在分析经典测温数据的基础上,观察常温蒸发实验中漏斗晶和人字晶的形成及生长过程,分析了不同温度段均一温度与气温、水温之间的关系。结合现代气象记录数据,分析了最大均一温度评价气候时存在的局限性。研究认为:漏斗晶晶核形成与卤水表面,包裹体温度受温度和气压共同影响,漏斗晶在卤水底部绕核生长,漏斗晶外围包裹体温度对应水底温度,沉入水下后漏斗晶生长缓慢,包裹体最大温度可能代表年度最高温度,以此为指标评价气候得出的结论过于炎热;人字晶是多个漏斗晶之间的桥接部分,大部分形成于卤水蒸发将近结束之时,人字形条纹内包裹体温度受气温和地表温度共同影响,地表温度远大于气温是造成包裹体最高温度过高的主要原因。

关键词：石盐包裹体不同晶形晶体生长温度含义应用局限性