检索结果-南通市图书馆

Stress corrosion cracking behavior of buried oil and gas pipeline steel under the coexistence of magnetic field and sulfate-reducing bacteria

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

Petroleum Science 2024年第2期21卷 1320-1332页

作者： Jian-Yu He Fei xie Dan Wang guang-Xin Liu Ming Wu Yue Qin College of Petroleum Engineering Liaoning Petrochemical UniversityFushun113001LiaoningChina Key Laboratory of Oil and Gas Storage and Transportation Technology in Liaoning Province Fushun113001LiaoningChina State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing100084China PipeChina West East Gas Pipeline Company Shanghai200120China

Magnetic field and microorganisms are important factors influencing the stress corrosion cracking(SCC)of buried oil and gas pipelines. Once SCC occurs in buried pipelines, it will cause serious hazards to the soil environment. The SCC behavior of X80 pipeline steel under the magnetic field and sulfate-reducing bacteria(SRB) environment was investigated by immersion tests, electrochemical tests, and slow strain rate tensile(SSRT) tests. The results showed that the corrosion and SCC sensitivity of X80 steel decreased with increasing the magnetic field strength in the sterile environment. The SCC sensitivity was higher in the biotic environment inoculated with SRB, but it also decreased with increasing magnetic field strength, which was due to the magnetic field reduces microbial activity and promotes the formation of dense film layer. This work provided theoretical guidance on the prevention of SCC in pipeline steel under magnetic field and SRB coexistence.

关键词： Magnetic field Sulfate-reducing bacteria Film layer Stress corrosion cracking Oil and gas pipelines

腰椎管狭窄累及节段数对脊柱骨盆矢状参数的影响

在线全文

学校读者我要写书评

暂无评论

中国矫形外科杂志 2024年第13期32卷 1241-1244页

作者：田浩韩鹏赵薇解光越殷胜春张志勇侯晓华赵海勇河北省唐山市工人医院骨一科河北唐山063000

[目的]探讨退变性腰椎管狭窄症(degenerative lumbar spinal stenosis,DLSS)累及节段数对脊柱-骨盆矢状参数的影响。[方法]回顾性分析2019年11月—2021年11月本院收治的192例退变性腰椎管狭窄症患者的临床影像资料,依据影像,72例DLSS累... 详细信息

[目的]探讨退变性腰椎管狭窄症(degenerative lumbar spinal stenosis,DLSS)累及节段数对脊柱-骨盆矢状参数的影响。[方法]回顾性分析2019年11月—2021年11月本院收治的192例退变性腰椎管狭窄症患者的临床影像资料,依据影像,72例DLSS累及单节段,63例累及双节段,57例累及多节段。比较三组患者临床及影像资料。[结果]三组腰痛VAS评分、腿痛VAS评分、ODI评分的差异均无统计学意义(P>0.05),但是,病程依次为单节段组双节段组>多节段组;而骨盆倾斜角(pelvic tilt,PT)[(21.6±7.0)°vs(21.8±4.2)°vs(24.9±6.5)°,P=0.005]依次为单节段组<双节段组<多节段组。[结论]随DLSS累及节段数增加腰椎前凸及胸椎后凸和骶骨倾斜角减小,而骨盆倾斜角增加。

关键词：退行性腰椎管狭窄症影像累及节段数矢状面脊柱骨盆参数

Microstructure and properties of coarse-grained WC-10Co cemented carbides with different carbon contents during heat treatments

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第4期43卷 1786-1792页

作者： Yuan-Feng xie Xing-Cheng xie Zhong-Wu Li Rui-Jun Cao Zhong-Kun Lin Qing Li Chen-guang Lin Powder Metallurgy and Special Materials Research Department General Research Institute for Nonferrous MetalsBeijing100088China

The effects of cryogenic treatment(CT)and tempering-cryogenic treatment(TCT)on the microstructure and properties of coarse-grained WC-10Co cemented carbides with different carbon contents were *** binder phase,WC mean grain sizes,W solubility in the binder,relative magnetic s aturation,densities,hardness,wear resistance and second phase precipitation of cemented carbides with different heat treatments were *** results show that there are significant changes of microstructure and properties in the samples with CT and TCT,especially due to the precipitation of metastable nanoparticles W_(x)Co_(y)C_(z) in the binder during the heat treatments of CT and *** the simultaneous combination of microstructure and nanoparticle-reinforced binder,a dramatically improved combination of hardness and wear resistance of the samples after TCT has been achieved.

关键词： Cryogenic treatment Tempering Coarsegrained cemented carbide Carbon content Nanoparticlereinforced binder

Influence of Heat-setting Temperature on the Microporous Structure and Properties of PP/HDPE Bilayer Microporous Membranes

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2024年第8期42卷 1243-1252页

作者： Jie xie Yong-Shi Wu Jia-Yi xie Rui-Jie Xu Cai-Hong Lei Sai-Nan Song guang-Quan Li An-Ping Huang School of Materials and Energy Guangdong University of TechnologyGuangzhou 510006China Lanzhou Petrochemical Research Center Petrochemical Research InsititutePetroChinaLanzhou 730060China School of Chemistry and Civil Engineering Shaoguan CollegeShaoguan 512005China

Due to the mechanical stability of PP layer,the PP/HDPE double-layer microporous mem brane could be prepared at a higher heat-setting temperatu re than that of PE monolayer *** this work,the effects of heat-setting temperature on the pore structure and properties of PP/HDPE dou ble-layer membrane were *** the increase of heat-setting temperature from 120℃to 130℃,the length of connecting bridge crystal and crystallinity in the PE layer increase due to the melting of thin lamellae and the stability of connecting bridge structure during *** corresponding air permeability,po rosity,wetta bility of liquid electrolyte and mechanical property of the heat-set microporous membrane increase,exhibiting better electrochemical ***,when the heat-setting temperature is further increased to 140℃,higher than the melting point of PE resin,some pores are closed since the lamellae and connecting bridges melt and shrink during heat-setting,resulting in a decrease of air permeability and *** contrast,there is negligible change in the PP layer within the above heat-setting temperature *** study successfully builds the relationship between the stable pore structure and property of microporous membrane during heat-setting,which is helpful to guide the production of high-pe rformance PP/PE/PP lithium batteries separator.

关键词： PP/HDPE bilayer microporous membranes Heat-setting temperature SAXS

Relativistic Beaming Effect of γ-Ray Emission from γ-Ray-Loud Blazars

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第10期18卷 1423-1426页

作者： MEI Dong-Cheng xie guang-Zhong QIN Yi-Ping JIANG Ze-jun Department of Physics Yunnan University Kunming 650091 National Astronomical Observatories Chinese Academy of SciencesBeijing 100012 Yunnan Astronomical Observatory Chinese Academy of Sciences P.O.Box 110 Kunming 650011

We have studied the luminosity-timescales relation 0f29 γ-ray-loud blazars with observed minimum variation timescales. Following the acceleration model of Ghisellini and Maraschi (1989 Astrophys. J. 340 189), a relation between the variation of the timescale in γ-rays and that in other wavebands has been derived. Both the observed and Doppler-corrected γ-ray luminosity-time scales relations have been calculated. The observed luminosity of the majority of sources is above the Eddington limit. The intrinsic luminosity of all sources is below the Eddington limit, suggesting that the γ-ray emission of the γ-ray-loud blazar originates from relativistic jets.

关键词： scales relation acceleration

Evolved Discrete Harmony Search Algorithm for Multi-objective No-wait Flow Shop Scheduling Problem

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

Evolved Discrete Harmony Search Algorithm for Multi-objectiv...

Research advances in treatment of Alzheimer disease with traditional Chinese medicines for invigorating kidney and removing phlegm

2012年计算机应用与系统建模国际会议

作者： xie guang Li Junqing Hainan University Sanya College School of Computer Science Liaocheng University

In this paper, an evolved discrete harmony search (EDHS) is proposed. Firstly, a job-permutation-based encoding scheme is applied to enable the continuous harmony search algorithm to be used in all sequencing problems. Additional, a new method is proposed to generate new solutions, while an efficient approach is developed to update the archive set of the non-dominated solutions during the search process. Finally, computational simulation results based on the well-known benchmarks show that the proposed EDHS algorithm is superior to hybrid differential evolution algorithm in terms of searching quality, diversity level and efficiency.

关键词： Harmony search No-wait flow shop Multi-object optimization

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

中国药理学与毒理学杂志 2019年第10期 848-849页

作者： NING Fu-nan SHI Kun xie guang-jing LAN Zhou WANG Ping School of Pharmacy Hubei University of Traditional Chinese Medicine School of Basic Medicine Hubei University of Traditional Chinese Medicine Postdoctoral Research Station of China Academy of Chinese Medical Sciences

Alzheimer disease(AD) is a chronic degenerative central nervous system disease with a long course of disease and high disability rate, which has become a major and difficult disease that seriously affects the health of the elderly. In recent years, Chinese medicine has accumulated rich experience in the treatment of *** its stable curative effect, small toxic and side effects, and multi-target, multi-channel and multi-system advantages, it has gained great attention in the medical field. The theory of traditional Chinese medicine believes that the main pathogenesis of AD lies in the deficiency of kidney essence, resulting in the lack of marrow, and finally the brain can not be replenished and the mind is *** the same time, the five internal organs operating to deliver essence, qi, blood and body fluid become weaker,phlegm turbid is brewed, phlegm obstructs clear orifices,and mental state is dizzy. Therefore, it is often treated with the method for invigorating kidney and removing phlegm and always receives unexpected results. In this article, it aims to explore the possible current mechanisms of the pathogenesis of AD, including the formation of toxic proteins, neuroinflammation, neuronal loss, etc.,to explore the current status of the treatment of AD with traditional Chinese medicine, formula and its chemical components.

关键词： Alzheimer disease invigorating kidney and removing phlegm traditional Chinese medicine

Comprehensive Treatment with Chinese Medicine in Patients with Advanced Non-Small Cell Lung Cancer: A Multicenter, Prospective, Cohort Study

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2017年第10期23卷 733-739页

作者： LIU Jie LIN Hong-sheng HOU Wei HUA Bao-jin ZHANG Pei-tong LI Jie WANG Shen-yu xie Ying ZHANG Yue xie guang-ru ZHANG Mei-ying SHI Wen-guang GUAN Nian-bo GUAN Tian-yu LI Cong-huang LU Li-yuan ZHANG Ying LI Dao-rui LIU Hao Department of Oncology Guang'anmen Hospital China Academy of Chinese Medical Sciences Department of Integrative Oncology Liaoning Cancer Hospital Department of Traditional Chinese Medicine Shanxi Cancer Hospital Traditional Chinese Medicine Department Jilin Cancer Hospital Department of Integrative Oncology Tianjin Medical University Cancer Institute and Hospital

Objective： To determine whether additional Chinese medicine（CM） could prolong survival and improve the quality of life（QOL） in patients with advanced non-small cell lung cancer（NSCLC） compared with Western medicine（WM） alone. Methods： This was a multicenter, prospective cohort study. A total of 474 hospitalized patients with stage Ⅲ–Ⅳ NSCLC were recruited and divided into 2 groups. Patients in the WM group received radiotherapy, chemotherapy, and optimal supportive therapy according to the National Comprehensive Cancer Network（NCCN） guidelines. In the integrative medicine（IM） group, individualized CM（Chinese patent medicines and injections） and WM were administered. The primary end point was overall survival, and the secondary end points were time to disease progression, adverse events, and QOL. Follow-up clinical examinations and chest radiography were performed every 2 months. Results： The median survival was 16.60 months in the IM group and 13.13 months in the WM group（P〈0.01）. The incidences of loss of appetite, nausea, and vomiting in the IM group were significantly lower than those in the WM group（P〈0.05）. The QOL based on Functional Assessment of Cancer Therapy-Lung in the IM group was markedly higher than that in the WM group at the fourth course（P〈0.05）. Conclusions： Additional CM may prolong survival and improve the QOL patients with NSCLC. The adverse effects of radio-and chemotherapy may be attenuated as CM is used in combination with conventional treatments.

关键词： advanced non-small cell lung cancer Chinese medicine integrative medicine

MDLB:a metadata dynamic load balancing mechanism based on reinforcement learning

在线全文

学校读者我要写书评

暂无评论

Frontiers of Information Technology & Electronic Engineering 2020年第7期21卷 1034-1046页

作者： Zhao-qi WU Jin WEI Fan ZHANG Wei GUO guang-wei xie National Digital Switching System Engineering&Technological R&D Center Zhengzhou 450002China School of Computer Science Fudan UniversityShanghai 200433China Data Arena Institute Fudan UniversityShanghai 200433China

With the growing amount of information and data, object-oriented storage systems have been widely used in many applications, including the Google File System, Amazon S3, Hadoop Distributed File System, and Ceph, in which load balancing of metadata plays an important role in improving the input/output performance of the entire system. Unbalanced load on the metadata server leads to a serious bottleneck problem for system performance. However, most existing metadata load balancing strategies, which are based on subtree segmentation or hashing, lack good dynamics and adaptability. In this study, we propose a metadata dynamic load balancing(MDLB) mechanism based on reinforcement learning(RL). We learn that the Q_learning algorithm and our RL-based strategy consist of three modules, i.e., the policy selection network, load balancing network, and parameter update network. Experimental results show that the proposed MDLB algorithm can adjust the load dynamically according to the performance of the metadata servers, and that it has good adaptability in the case of sudden change of data volume.

关键词： Object-oriented storage system Metadata Dynamic load balancing Reinforcement learning Q_learning