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Shaly detritus embedded epoxy-resin coated proppants

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Petroleum Science 2022年第4期19卷 1735-1744页

作者： Zhao-hui Lu Xiu-Ping lan Yong Yuan Jian-Kun Zhou Si-Yuan Chen Fan Fan ying-Chun niu Shou-Zhen Li Kai-yi hu yang Zhou Quan Xu Key Laboratory of Shale Gas Exploration Ministry of Natural ResourcesChongqing Institute of Geology and Mineral ResourcesChongqing401120China State Key Laboratory of Petroleum Resources and Prospecting Bejing Key Laboratory of Biogas Upgrading UtlizationHarvard SEAS-CUPB Joint Laboratory on Petroleum ScienceChina University of Petroleum(Beijing)Beijing102249China

Proppant plays a significant role in the hydraulic fracturing process, which can affect the production of oil and gas wells. Due to the high density and low adhesion force, the settling speed of traditional proppants is fast, which will lead to the blockage of a crack channel. In this study, a proppant with double layer structure is fabricated by coating epoxy-resin and shaly detritus on ceramic proppants for the first time,respectively. The epoxy-resin enables the shaly detritus to be coated on the proppant successfully, which can provide a new method for shaly detritus treatment. The adhesive ability of shaly detritus and epoxyresin coated proppants(SEPs) is improved by 10.4% under the load force of 500 n N, which prolongs the time for the fracture to close. At the same time, the suspending ability of SEPs is two times higher than the uncoated proppants. Once the guar gum solution concentration is 0.3 wt%, the settling time of SEPs is36.7% longer than that of the uncoated proppants, which can effectively reduce the settlement of proppants in the crack. In addition, the hydrophobicity of the SEPs is enhanced, which reduces the wateroil ratio of crude oil and increases the liquid conductivity tested by deionized water. In summary, this new proppant is expected to promote the development of unconventional oil and gas resources.

关键词： Coated proppant Shaly detritus Hydrophobicity Conductivity

Genetic Analysis and Preliminary Mapping of a Highly Male-Sterile Gene in Foxtail Millet(Setaria italica ***.) Using SSR Markers

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Journal of Integrative Agriculture 2013年第12期12卷 2143-2148页

作者： WANG Jun WANG Zhi-lan yang hui-qing YUAN Feng GUO Er-hu TIAN Gang AN Yuan-huai LI hui-xia WANG Yu-wen DIAO xian-min GUO Ping-yi College of Agriculture Shanxi Agricultural University Millet Research Institute Shanxi Academy of Agricultural Sciences Institute of Crop Sciences Chinese Academy of Agricultural Sciences

Breeding of male-sterile lines has become the mainstream for the heterosis utilization in foxtail millet,but the genetic basis of most male-sterile lines used for the hybrid is still an area to be *** this study,a highly male-sterile line Gao146A was *** analysis indicated that the highly male-sterile phenotype was controlled by a single recessive gene a single recessive *** F 2 population derived from cross Gao146A/K103,one gene controlling the highly male- sterility,tentatively named as ms1,which linked to SSR marker b234 with genetic distance of 16.7 cM,was mapped on the chromosome *** results not only laid the foundation for fine mapping of this highly male-sterile gene,but also helped to accelerate the improvement of highly male-sterile lines by using molecular marker assisted breeding method.

关键词： foxtail millet(Setaria italic L.Beauv.) highly male-sterility gene mapping SSR marker

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基于相关攻击的A5／1算法识别

电子与信息学报 2006年第5期28卷 827-831页

作者：陈伟胡云杨义先钮心忻北京邮电大学信息安全中心北京100876 北京邮电大学数字内容研究中心北京100876

利用相关攻击获得畸变的A5／1序列,再用统计工具对其进行处理可以得出．A5／I统计特征,从而找到正确区分A5／I算法输出和伪随机序列的方法。实验验证该方法能有效地将A5／I算法输出和伪随机序列区分开来。

关键词：密码分析算法识别 A5/1算法相关攻击正态分布

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基于移动代理的电子交易安全方案

北京邮电大学学报 2006年第4期29卷 81-85页

作者：胡兰兰杨义先北京邮电大学信息工程学院北京100876

总结了基于移动代理的电子交易安全需求,在未指定代理者的强代理签名方案的基础上,提出了一种新的安全电子交易方案.新方案增加了客户隐私保护功能,能有效解决代理在多个备选商家主机之间移动时的安全问题,保证了客户和商家双方身份的... 详细信息

总结了基于移动代理的电子交易安全需求,在未指定代理者的强代理签名方案的基础上,提出了一种新的安全电子交易方案.新方案增加了客户隐私保护功能,能有效解决代理在多个备选商家主机之间移动时的安全问题,保证了客户和商家双方身份的不可伪造性和交易信息的不可拆分性,可抗重放攻击,实现了各商家之间身份和交易信息的保密.分析表明,新方案满足所有电子交易安全需求,更具实用性.

关键词：移动代理电子交易强代理签名

基于OpenFlow的网络层移动目标防御方案

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通信学报 2017年第10期38卷 102-112页

作者：胡毅勋郑康锋杨义先钮心忻北京邮电大学网络空间安全学院北京100876 贵州大学公共大数据国家重点实验室贵州贵阳550025

为在网络攻防博弈中占据主动地位,利用OpenFlow网络结构提供的网络灵活性,提出一个基于OpenFlow的网络层移动目标防御方案。在网络层,通过对防护区域内通信中的每一跳网络地址进行伪随机变换,对跨区域网络通信的出口端口进行伪随机映射... 详细信息

为在网络攻防博弈中占据主动地位,利用OpenFlow网络结构提供的网络灵活性,提出一个基于OpenFlow的网络层移动目标防御方案。在网络层,通过对防护区域内通信中的每一跳网络地址进行伪随机变换,对跨区域网络通信的出口端口进行伪随机映射,从而实现通信节点的隐藏以及网络结构的保护。实验表明,该方案有效可行。相比于现有移动目标防御方案,该方案易部署、兼容性好,并实现了节点全网的通信保护。

关键词：主动防御 OpenFlow 移动目标防御

Opinion consensus incorporating higher-order interactions in individual-collective networks

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Chinese Physics B 2024年第7期33卷 105-115页

作者：叶顺涂俐兰王先甲胡佳王薏潮 hubei Province Key Laboratory of Systems Science in Metallurgical Process Wuhan University of Science and TechnologyWuhan 430065China College of Science Wuhan University of Science and TechnologyWuhan 430065China Economics and Management School of Wuhan University Wuhan UniversityWuhan 430065China

In the current information society, the dissemination mechanisms and evolution laws of individual or collective opinions and their behaviors are the research hot topics in the field of opinion dynamics. First, in this paper, a two-layer network consisting of an individual-opinion layer and a collective-opinion layer is constructed, and a dissemination model of opinions incorporating higher-order interactions(i.e. OIHOI dissemination model) is proposed. Furthermore, the dynamic equations of opinion dissemination for both individuals and groups are presented. Using Lyapunov's first method,two equilibrium points, including the negative consensus point and positive consensus point, and the dynamic equations obtained for opinion dissemination, are analyzed theoretically. In addition, for individual opinions and collective opinions,some conditions for reaching negative consensus and positive consensus as well as the theoretical expression for the dissemination threshold are put forward. Numerical simulations are carried to verify the feasibility and effectiveness of the proposed theoretical results, as well as the influence of the intra-structure, inter-connections, and higher-order interactions on the dissemination and evolution of individual opinions. The main results are as follows.(i) When the intra-structure of the collective-opinion layer meets certain characteristics, then a negative or positive consensus is easier to reach for individuals.(ii) Both negative consensus and positive consensus perform best in mixed type of inter-connections in the two-layer network.(iii) Higher-order interactions can quickly eliminate differences in individual opinions, thereby enabling individuals to reach consensus faster.

关键词： two-layer social networks individual and collective opinions higher-order interactions consensus Lyapunov's first method

Male gender is associated with an increased risk of anastomotic leak in rectal cancer patients after total mesorectal excision

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Gastroenterology Report 2018年第2期6卷 137-143,I0003页

作者： Jian-ping Wang and Ping lan Chi Zhou xian-rui Wu Xuan-hui Liu Yu-feng Chen Jia Ke Xiao-wen He Xiao-sheng He Tuo hu yi-feng Zou Xiao-bin Zheng hua-shan Liu Jian-cong hu Xiao-jian Wu Jian-ping Wang Ping lan Department of Colorectal Surgery the Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangdong Provincial Key Laboratory of Colorectal and Pelvic Floor DiseasesGuangzhouGuangdong 510065China

Background:The impact of a patient’s gender on the development of anastomotic leak(AL)in rectal cancer patients following total mesorectal excision(TME)remains *** aim of this study was to evaluate the association between patients’gender and the risk of ***:All rectal cancer patients following TME with a primary anastomosis during the study period from 2010 to 2014 were *** of the post-operative AL incidence rate between male and female patients were ***:Of all patients examined(n¼956),587(61.4%)were males and 369(38.6%)were *** patients were more likely to have a history of smoking and drinking alcohol,but less likely to have a history of abdominal surgery compared to female patients.A higher incidence rate of pre-operative bowel obstruction and larger tumor volume in male patients was observed in our *** all the patients,81(8.5%)developed post-operative *** male patients(n¼62,10.6%)suffered from AL than females(n¼19,5.1%)(P¼0.003).Multivariate logistic regression analyses confirmed the association between male gender and AL[odds ratio(OR):2.41,95%confidence interval(CI):1.37–4.23,P¼0.002].Similar results were also obtained in patients who underwent laparoscopic TME(OR:2.11,95%CI:1.15–3.89,P¼0.016).Conclusions:Male patents were found to have an increased risk for AL following TME with a primary anastomosis.A temporary protecting stoma may help to protect the anastomosis and lessen the risk for AL especially in male patients.

关键词： rectal cancer anastomotic leak gender risk factor total mesorectal excision primary anastomosis

Measurement of Br(n,γ)cross sections up to stellar s-process temperatures at the CSNS Back‑n

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Nuclear Science and Techniques 2023年第11期34卷 226-241页

作者： Gao‑Le yang Zhen‑Dong An Wei Jiang xian‑Kai Li Wei‑Wei Qiu Zheng‑Fa Liao Zi‑Yue Zhuang Xiao‑Ping Zhang Sheng‑Li Chen Chen‑Chen Guo Er‑Xi Xiao Xiao Fang xin‑xiang Li xin‑Rong hu Bing Jiang Jin‑Cheng Wang Jie Ren Wen Luo Zhi‑Chao Zhu Hao‑yang lan Zong‑Wei Cao Xu Ma ying‑Du Liu Pu‑Sen Wang yi yang Ping Su xian‑Gai Deng Wan‑Bing He Chun‑Wang Ma Yu‑Ting Wang Zhi‑Tao Dai Peng‑Qin He Ren‑Guang Tang Tao Zhou Jing Wang Han yi Yue Zhang Yong‑Hao Chen Rui‑Rui Fan Ke‑Qing Gao Qiang Li Kang Sun Zhi‑xin Tan Min‑Hao Gu Han‑Tao Jing Jing‑Yu Tang School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China CNSA Macao Center for Space Exploration and Science Macao 999078China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Spallation Neutron Source Science Center Dongguan 523803China School of Nuclear Science and Technology University of South ChinaHengyang 421001China Sino‑French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Nuclear Data China Institute of Atomic EnergyBeijing 102413China School of Materials Science and Engineering Xiangtan UniversityXiangtan 411100China Key Laboratory of Nuclear Physics and Ion‑beam Application(MOE) Institute of Modern PhysicsDepartment of Nuclear Science and TechnologyFudan UniversityShanghai 200433China Institute of Particle and Nuclear Physics Henan Normal UniversityXinxiang 453007China School of Physics Henan Normal UniversityXinxiang 453007China Shenzhen Center Cancer hospitalChinese Academy of Medical SciencesShenzhen 518100China School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230027China

The neutron capture cross sections(n,γ)of bromine were obtained using the time-of-flight technique at the Back-n facility of the China Spallation Neutron ***γ-rays originating from neutron-induced capture events were detected using four C_(6)D_(6) *** pulse-height weighting technique and double-bunch unfolding method based on Bayesian theory were used in the data *** deductions,normalization,and corrections were carefully considered to obtain reliable measurement *** multilevel R-matrix Bayesian code SAMMY was used to extract the resonance parameters in the resolved resonance region(RRR).The average cross sections in the unresolved resonance region(URR)were obtained from 10 to 400 *** experimental results were compared with data from several evaluated libraries and previous experi-ments in the RRR and *** TALYS code was used to describe the average cross sections in the *** astrophysical Maxwell average cross sections(MACSs)of ^(79,81)Br from kT=5 to 100 keV were calculated over a sufficiently wide range of neutron *** a thermal energy of kT=30 keV,the MACS value for ^(79)Br 682±68 mb was in good agreement with the KADoNiS v1.0 recommended *** contrast,the value of 293±29 mb for ^(81)Br was substantially higher than that of the evaluated database and the KADoNiS v1.0 recommended value.

关键词： Time-of-flight technique Neutron capture cross sections Maxwell average cross sections

基于Metropolis准则遗传算法的企业动态联盟生成模型

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北京理工大学学报 2008年第11期28卷 988-992页

作者：李剑胡兰兰景博杨义先北京邮电大学灾备技术国家工程实验室北京100876 北京应用气象研究所计算机室北京100029

为了提高动态联盟中企业选择联盟伙伴和优化过程中的效率,提出一种基于Metropolis准则遗传算法的企业动态联盟生成模型.将模拟退火算法中的Metropolis准则与遗传算法相结合,提高企业选择联盟伙伴和优化过程中的效率.1 000次仿真实验表明... 详细信息

为了提高动态联盟中企业选择联盟伙伴和优化过程中的效率,提出一种基于Metropolis准则遗传算法的企业动态联盟生成模型.将模拟退火算法中的Metropolis准则与遗传算法相结合,提高企业选择联盟伙伴和优化过程中的效率.1 000次仿真实验表明,标准遗传算法SGA平均需要166次才能找到最优解,而基于Metropolis准则遗传算法(MGA)平均仅需要149次就可以找到最优解.企业选择联盟伙伴和优化时,基于Metropolis准则遗传算法(MGA)可以使企业高效找到最优联盟伙伴.

关键词：动态联盟伙伴选择基于Metropolis遗传算法