检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

超超临界火电机组高旁主阀阀座的修复技术

中国电力 2015年第7期48卷 68-71页

作者：唐彬陆亚安陆耀威蔡宝根上海电力股份有限公司吴泾热电厂上海200241 上海平安高压调节阀门有限公司上海201413

详细阐述了对1 000 MW超超临界燃煤发电机组高压旁路管道(简称高旁)主阀阀座的修复过程,通过执行严格的修复工作程序,采用热丝氩弧焊和镍基高温合金材料过渡等工艺方法,并利用六轴联动焊接机械手臂的柔性,克服了高旁主阀高温和主阀阀腔... 详细信息

详细阐述了对1 000 MW超超临界燃煤发电机组高压旁路管道(简称高旁)主阀阀座的修复过程,通过执行严格的修复工作程序,采用热丝氩弧焊和镍基高温合金材料过渡等工艺方法,并利用六轴联动焊接机械手臂的柔性,克服了高旁主阀高温和主阀阀腔狭小等恶劣环境条件进行堆焊的困难,确保堆焊层质量能够满足阀座密封面的各项性能要求。同时,彻底消除了阀体材料为SA182-F91/F92的主蒸汽高旁阀门阀座的开裂和吹损等缺陷,保证了发电机组的设备可靠性和经济性,亦为解决超超临界燃煤发电机组的高温高压蒸汽阀门内漏问题提供了思路和方法。

关键词：超超临界机组高压旁路主阀门阀座堆焊

Formation and mechanical properties of Zr-based bulk metallic glass composites with high oxygen levels

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2012年第30期57卷 3931-3936页

作者： LIU ZengQian YANG yaowei LI Ran HUANG lu ZHANG Tao Key Laboratory of Aerospace Materials and Performance(Ministry of Education) School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

Zr-based bulk metallic glass(BMG) composites with in situ formed Y 2 O 3 particle reinforcements were synthesized by proper additions of Y to ultrahigh-oxygen-containing glass-forming alloy ***,thermal stabilities,and mechanical properties of the composites were *** formation was greatly enhanced by Y additions in the alloys and the resultant particles were homogenously distributed in the glassy matrix,allowing for the fabrication of oxide dispersion strengthened BMG *** compressive strength and hardness increased by 10% and 20%,respectively,with the introduction of Y 2 O 3 *** results are significant for the design and production of Zr-based BMGs and BMG composites with improved properties using commercial high-oxygen content raw materials under industrial conditions.

关键词： Zr基非晶合金大块金属玻璃复合材料氧含量力学性能氧化物弥散强化玻璃形成 BMG

Efficiency analysis of sorption-enhanced method in steam methane reforming process

在线全文

学校读者我要写书评

暂无评论

Carbon Resources Conversion 2023年第2期6卷 132-141页

作者： yaowei Hu lu Liu Kai Xu Yuncai Song Jieying Jing Huiyan Zhang Jie Feng State Key Laboratory of Clean and Efficient Coal Utilization Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Key Laboratory of Energy Thermal Conversion and Process Measurement and Control of Ministry of Education Southeast UniversityNanjing 210096China

The sorption-enhanced method can change the thermodynamic equilibrium by absorbing CO_(2).However,it also brings about the problems of high regeneration temperature of adsorbent and large regeneration energy *** order to study the impact of enhanced adsorption methods on the overall energy cost of the system in the hydrogen production process,this paper analyzes and compares steam methane reforming and reactive adsorption-enhanced steam methane reforming with the energy consumption of hydrogen production products as the evaluation *** results showed that the energy consumption per unit hydrogen production decreased from 276.21 MJ/kmol to 131.51 MJ/kmol,and the decomposition rate of H2O increased by more than 20%after the addition of adsorption enhancement *** is proved that the advantage of sorption enhanced method on pre-separation of CO_(2)in the product makes up for the disadvantage of energy consumption of adsorbent *** addition,the ability of the process to obtain H element is improved by the high decomposition rate of H2O,which realizes a more rational distribution of the element.

关键词： Sorption-enhanced method Steam methane reforming Reactive sorption enhanced steam methane reforming Pressure swing adsorption Process simulation

Enrichment of anchoring sites by introducing supramolecular halogen bonds for the efficient perovskite nanocrystal LEDs

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

Light(Science & Applications) 2023年第10期12卷 2122-2130页

作者： Po lu Ting Li Min lu Cheng Ruan Siqi Sun Zhennan Wu Yuan Zhong Fujun Zhang Yanbo Gao yaowei Huang Yang Wang Junhua Hu Fengping Yan Yu Zhang State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering Jilin UniversityChangchunChina School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijingChina Changchun Cedar Electronics Technology Co. Ltd.ChangchunChina Changchun Institute of Optics Fine Mechanics and PhysicsChinese Academy of SciencesChangchunChina Key Laboratory of Materials Physics of Ministry of Education Department of Physics and Engineering Zhengzhou UniversityZhengzhouChina

Considering the multi-functionalization of ligands,it is crucial for ligand molecular design to reveal the landscape of anchoring ***,a typical triphenylphosphine(TPP)ligand was employed to explore its effect on the surface of CsPbI_(3)perovskite nanocrystals(PNCs).Except for the conventionally considered P-Pb coordination,an P-I supramolecular halogen bonding was also found on the NC *** coexistence of the above two types of bonding significantly increased the formation energy of iodine vacancy defects and improved the photoluminescence quantum yield of PNCs up to 93%.Meanwhile,the direct interaction of P and I enhanced the stability of the Pb-I octahedra and dramatically inhibited the migration of I ***,the introduction of additional benzene rings(2-(Diphenylphosphino)-biphenyl(DPB))increased the delocalized properties of the PNC surface and significantly improved the charge transport of the *** a result,the DPB passivated CsPbI_(3)NCs based top-emitting LEDs exhibite a peak external quantum efficiency(EQE)of 22.8%,a maximum luminance of 15,204 cd m^(−2),and an extremely low-efficiency roll-off of 2.6%at the current density of 500 mA cm^(−2).

关键词： halo bonding quantum

Enhancement of the catalytic efficiency of a hyperthermophilic α-amylase from Thermococcus siculi by site-directed mutagenesis

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

Enhancement of the catalytic efficiency of a hyperthermophil...

Purification and characterization of a dextranase from Catenovulum *** its effect on Streptococcus mutans biofilm inhibitory

全国第九届海洋生物技术与创新药物学术会议

作者： Mingsheng lu yaowei Fang Shu Liu Yuliang Jiao Shujun Wang Huaihai Institute of Technology School of Marine Science and Technology

The hyperthermophilic a-amylase TSA from Thermococcus siculi HJ21,an enzyme of interest in industrial starch liquefaction processes,belongs to the class-13 of glycosylhydrolases,with optimal activity at 95℃and pH 5.0,and does not require additional Cafor *** this study,the TSA-encoding gene was modified by site-directed mutagenesis to obtain TSA enzymes with improved catalytic efficiency and thermal *** three-dimensional structural model of the *** HJ21 a-amylase was constructed based on the X-ray structure of a-amylase from Pyrococcus woesei using *** residues constituting the active site cavity were identified and the functional roles of six residues were determined by site-directed *** mutagenesis-based method helped identify TSA mutants with improved catalytic activity and *** activitiy of the DT9 mutant(L98R,Y184H,A109V,Y121S,and V125L)was 473%(372.73 U/mg)relative to that of the wild-type a-amylase(78.75U/mg)at 90℃.The DT9 mutant enzyme retained more than 82%and 76%of its activity at 90℃and 100℃,respectively,for 6 h,while wild-type TSA lost 23%and 33%activity,respectively,at these *** of molecular modeling suggest that the thermostability and the catalytic efficiency of hyperthermophilic a-amylase may be a result of hydrogen bonds and hydrophobic interactions.

关键词：

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

Purification and characterization of a dextranase from Caten...

基于改进贝叶斯网络的风机齿轮箱自动诊断策略研究

全国第九届海洋生物技术与创新药物学术会议

作者： Shujun Wang Ruanhong Cai Mingsheng lu yaowei Fang Yuliang Jiao Shu Liu Huaihai Institute of Technology School of Marine Science and Technology

In the present study,dextranase from a Catenovulum sp.(Cadex)was purified 29.6-fold.A specific activity of 2,309 U/mg protein and a yield of 16.9%were *** SDS-PAGE results showed Cadex to be a monomer with a molecular weight of 82 *** showed maximum activity at pH 8.0 and 40℃and was stable at temperatures under 30℃and at pH ranging from 5.0-11.0.A metal ion and chemical dependency study showed Mn,Sr,ethanol,and carboxybenzene to exert a positive effect on Cadex,while Cu,Fe,Zn,Cd,Ni,Co,and sodium lauryl sulfate were found to be *** specificity study showed Cadex specifically cleaves theα-1,6 glycosidic linkages,and thin layer chromatogram indicated that the main hydrolysis products of Cadex are isomaltotriose,isomaltotetraose,and *** crystal violet staining and scanning electron microscopy studies gave evidences that Cadex could impede the forming of Streptococcus mutans biofilm to some *** conclusion,Cadex is an alkaline,cold-adapted endo-type dextranase suitable for development of a novel agent for the treatment of dental caries.

关键词： biofilm Catenovulum dextranase enzymatic characterization purification Streptococcus mutans

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

电力系统保护与控制 2019年第19期47卷 145-151页

作者：张露江张利杨要伟卢晓光国网河南省电力公司检修公司河南郑州450007 郑州公用事业投资发展集团有限公司河南郑州450007 许昌许继风电科技有限公司河南许昌461000

为实现风机运行状态的监测功能,并完成监测数据智能诊断任务,开发了风机智能监测系统。首先,基于振动理论建立了齿轮箱动态模型,并分析了不同故障类型的数据特征,为智能诊断提供了辨识依据。然后,利用贝叶斯网络理论,分析了贝叶斯网络... 详细信息

为实现风机运行状态的监测功能,并完成监测数据智能诊断任务,开发了风机智能监测系统。首先,基于振动理论建立了齿轮箱动态模型,并分析了不同故障类型的数据特征,为智能诊断提供了辨识依据。然后,利用贝叶斯网络理论,分析了贝叶斯网络的全概率公式;并在此基础上进行研究,提出了简化广义逆矩阵的智能诊断实现方法。最后,搭建了以广义逆矩阵的智能诊断方法为核心的智能监测系统实现结构。系统在现场进行了运行检测,结果表明,智能监测系统输出结果和人工诊断结果相符。系统已在风场取得初步的工程应用。

关键词：贝叶斯网络振动理论风力发电机智能诊断

Induced Matching Number of the Plane Grid Graph

在线全文

学校读者我要写书评

暂无评论

Chinese Quarterly Journal of Mathematics 2004年第1期19卷 95-100页

作者： luXiao-xu PEIMing yaowei-li ZHOUJu DepartmentofMathematics ZhengzhouUniversityZhengzhou450052China CollegeofMathe-maticsandInformationScience HenanUniversityKaifeng475001China

An induced matching M in a graph G is a matching such that V(M) induces a 1-regular subgraph of G. The induced matching number of a graph G, denoted by I M(G), is the maximum number r such that G has an induced matching of r edges. Induced matching number of Pm×Pn is investigated in this paper. The main results are as follows:(1) If at least one of m and n is even, then IM(Pm×Pn=[(mn)/4].(2) If m is odd, then

关键词： induced matching induced matching number α-set

在线全文

学校读者我要写书评

暂无评论

随钻电成像仪器磁流激励仿真和图像增强方法

中国石油大学学报（自然科学版） 2024年第4期48卷 92-100页

作者：于增辉刘保银卢涛刘耀伟中海油田服务股份有限公司油田技术研究院河北燕郊065201 杭州迅美科技有限公司浙江杭州310012

提出采用磁流替代环形线圈激励源方法模拟随钻电成像仪器(REIT)响应,在考察随钻电成像测井仪器的探测特性基础上进行环境校正方法研究,旨在获得清晰度增强图像。考虑偏心距、地层电性参数、井眼参数变化,建立仪器响应函数库,利用查库方... 详细信息

提出采用磁流替代环形线圈激励源方法模拟随钻电成像仪器(REIT)响应,在考察随钻电成像测井仪器的探测特性基础上进行环境校正方法研究,旨在获得清晰度增强图像。考虑偏心距、地层电性参数、井眼参数变化,建立仪器响应函数库,利用查库方法反演偏心距并对图像进行井眼环境校正和软件聚集增强处理,实现提高图像质量目的。结果表明,采用本文给出的方法可以对仪器原始采集的电信号进行井眼环境校正和图像增强,对提高图像质量、消除井眼环境对测量影响具有良好效果,在成像测井地层评价、随钻电成像地质导向应用中都具有重要意义。

关键词：随钻电成像反演偏心环境校正图像增强