Effect of inclusion on service properties of GW103K magnesium alloy

The effects of inclusions on microstructure, mechanical property, corrosion behavior of Mg-10Gd-3Y （GW103K） alloys by unrefining, MgO ceramic filtering and JDMJ flux refining were investigated, respectively. The results indicate that with decreasing significantly the number and size grade of inclusions for the alloy refined with JDMJ flux, tensile strength and elongation increase; however, the yield strength is less than that of the alloy refined with MgO ceramic filter and unrefined alloy. With the decrease of the inclusions contents, the corrosion rate of the alloys quickly vary from 2.419 mg/（cm 2 ·d） to 1.265 mg/（cm 2 ·d）. After inclusion content is reduced to 0.385%, the corrosion rate has almost no changes. Finally, the relationship between the volume fraction of inclusions and service properties of GW103K alloy under different conditions are established quantitatively.

Mechanical Properties and Thermal Shock Resistance of SrAl_(2)Si_(2)O_(8) Reinforced BN Ceramic Composites

Hexagonal boron nitride(h-BN)ceramics have become exceptional materials for heat-resistant components in hypersonic vehicles,owing to their superior thermal stability and excellent dielectric properties.However,their densification during sintering still poses challenges for researchers,and their mechanical properties are rather unsatisfactory.In this study,SrAl_(2)Si_(2)O_(8)(SAS),with low melting point and high strength,was introduced into the h-BN ceramics to facilitate the sintering and reinforce the strength and toughness.Then,BN-SAS ceramic composites were fabricated via hot press sintering using h-BN,SrCO_(3),Al_(2)O_(3),and SiO_(2) as raw materials,and effects of sintering pressure on their microstructure,mechanical property,and thermal property were investigated.The thermal shock resistance of BN-SAS ceramic composites was evaluated.Results show that phases of as-preparedBN-SAS ceramic composites are h-BN and h-SrAl_(2)Si_(2)O_(8).With the increase of sintering pressure,the composites’densities increase,and the mechanical properties shew a rising trend followed by a slight decline.At a sintering pressure of 20 MPa,their bending strength and fracture toughness are(138±4)MPa and(1.84±0.05)MPa·m^(1/2),respectively.Composites sintered at 10 MPa exhibit a low coefficient of thermal expansion,with an average of 2.96×10^(-6) K^(-1) in the temperature range from 200 to 1200℃.The BN-SAS ceramic composites prepared at 20 MPa display higher thermal conductivity from 12.42 to 28.42 W·m^(-1)·K^(-1) within the temperature range from room temperature to 1000℃.Notably,BN-SAS composites exhibit remarkable thermal shock resistance,with residual bending strength peaking and subsequently declining sharply under a thermal shock temperature difference ranging from 600 to 1400℃.The maximum residual bending strength is recorded at a temperature difference of 800℃,with a residual strength retention rate of 101%.As the thermal shock temperature difference increase,the degree of oxidation on the ceramic surface and cracks due to thermal stress are also increased gradually.

Investigation of the Service Properties of the Electroslag Cast Metal

The electroslag cast metal features its cleanness,sound structure,consistent composition,smooth surface,high metal yield,excellent mechanical properties and service life.These advantages have been applied to turbine discs,aircraft landing frames,hollow ingot,die billets,crankshaft and cold rolling.

Study on the mechanical properties and service life of H13 mandrels

The microstructures and mechanical properties of H13 mandrels made by Baosteel and foreign companies were investigated in this study. Based on the comparison research, the processes were optimized, such as steelmaking, heat treatment and multiple forging processes. The quality of Baosteel mandrels was greatly improved by increasing the homogenizing of an annealing temperature and refining processes. The results of the pilot trial showed that the average number of piercing steel tubes for Baosteel mandrels was over 3000 ,which reached the level of imported mandrels.

Service Life Prediction of Lining Concrete of Subsea Tunnel under Combined Compressive Load and Carbonation

Qingdao Jiaozhou Bay subsea tunnel is the second self-built tunnel in China with the designed service life over 100 years.The durability of lining concrete are one of an important factors to determinate the service life of tunnel.Considering the main environmental loads and mechanical loads of subsea tunnel,the durability properties of lining concrete under combined action of compressive load and carbonation has been studied through the critical compressive load test,accelerated carbonation test,natural carbonation test and capillary suction test.The tests results show that critical compressive load apparently accelerates the carbonation and deteriorates the anti-permeability of concrete.Under the combined action of critical compressive load and carbonation,the durability of lining concrete decreases.Based on the carbonization life criteria and research results,for the high-performance concrete with proposed mix ratio,the predicted service life of lining concrete for Jiaozhou bay subsea tunnel is about 80 years which fails to reach the required service life.It is necessary to adopt other measurements simultaneously to improve the durability of lining concrete.

Influence of cooling conditions on X70 pipeline steel in-service welding HAZ

The chamber device was designed and set up to simulate the in-service welding. The results show ： the t8/5 , t8/3 and inner wall peak temperature Tp decrease with the cooling rate increases. The welding energy is carried off by flowing medium, the cooling rate increases, and many unbalanced microstructures such as granular bainite, martensite and M-A generate ; it worsens the properties of HAZ. Under air-cooling, the cooling rate is slow, the austenite grain grows obviously, the lath ferrite crosses the whole austenite, and it causes the hardness value is also big. The change of HAZ width is not obvious with the increase of cooling rate; and burn-through is not susceptible to the cooling rate. The quench microstructures increase and the hydrogen does not outflow from the HAZ easily when increase the cooling rate, so the susceptibility of hydrogen cracking increases.

Hotel Guest Service Technology

For any hotel guest reception technology is an important factor in the quality service process,financial-economic efficiency,and management of the hotel industry.The service process in the same type hotel is standard,meanwhile the service process technology undergoes certain alterations according to the hotel’s size,structure,category,and market segment orientation.Hotel customer service technology is characterized by cycling phases—consistent repeat of the service process before the departure of the guest from the hotel.The article discusses the four-phase cycle of guest reception,related to the hotel services and transactions.Each phase of the cycle consists of standard transactions/phases,which are carried out between hotel clients and the hotel itself.

现代产业学院混合所有制办学的现实意义、机制架构与路径选择

现代产业学院混合所有制办学有助于优化产业资源市场化配置、推动人才培养理实一体化、促进产业经济高质量发展和强化校企合作共同体构建。基本机制包括组织管理的健全机制、优质教学资源的共建机制、教师教学创新团队的共管机制、教育教学模式的改进机制和发展成果的共享机制。应探索混合制管理体制、协同建设系列优质教学资源、协同管理高素质教师教学创新团队、协同改进教育教学模式和共同分享发展成果,规范与促进现代产业学院混合所有制办学。

高校国家知识产权信息服务中心建设与服务现状及发展对策研究

基于知识产权推动创新发展、引领经济结构转型升级和支撑经济高质量发展的背景,文章通过对我国103所高校国家知识产权信息服务中心的建设现状、服务现状开展调研,分析存在问题,提出对策与建议,以期推动高校图书馆知识产权信息服务健康、可持续发展。

面向区域创新的高校知识产权信息公共服务营销策略研究

优质的知识产权信息公共服务供给将有效发挥知识产权对区域经济社会发展的支撑作用。作为区域网点机构,高校知识产权信息公共服务营销策略对于知识产权信息公共服务推广与实践,满足社会公众信息服务的可及性、便利性需求,具有理论价值和现实意义。本文对30家高校国家知识产权信息服务中心营销效果现状展开调研,结合实践经验进行问题分析,并从区域创新需求视角出发构建面向区域创新的高校知识产权信息公共服务营销框架,从而提出相应策略。研究策略为高校知识产权信息公共服务提供了针对性较强的参考。

高校知识产权信息服务体系的探索与实践——以北京邮电大学为例

文章聚焦高校知识产权信息服务体系建设,通过明确高校知识产权信息服务工作目标,提出高校知识产权信息服务高质量发展策略,即以服务体系建设目标为导向,加强知识产权信息基础服务内容规划、形成区域联盟、优化知识产权信息服务团队结构、夯实高校知识产权意识、统一高校知识产权职能机构等。并以北京邮电大学推进服务内容纵深发展、协同校内外多元主体、注重知识产权信息服务团队建设、提高知识产权意识与服务能力、构建三位一体服务格局的实践为例,探讨高校知识产权信息服务体系建设成效。

高质量发展视角下中国物业上市企业服务效率评价

物业服务是民生建设的重要内容,对增进民生福祉、构建和谐社会具有重要意义,物业企业作为其基本服务单元,探究高质量发展视角下以增效提质、与时俱进、人民满意为标尺的服务效率就显得尤为重要。文章以全国43家物业上市企业作为截面样本,以高质量发展为研究视角,引入ESG理念,重构物业服务效率评价指标体系,采用SE-DEA模型对其物业服务效率进行测度与比较,并按不同的ESG等级分析制约物业服务效率的因素,由此提出中国物业服务上市企业服务效率提升的对策与建议。

创新驱动发展战略下高校知识产权信息服务现状与思考

在创新驱动发展战略背景下,高校成为知识产权信息服务和科技创新的重要资源保障机构,高校知识产权信息服务的质量也体现了高校知识产权保护与运用的成效及科技创新水平。文章以福建省成立知识产权信息服务中心的高校为调查对象,通过调研总结各高校知识产权信息服务的现状,分析存在的问题,并提出相应的优化策略。

标准化推动高校物业服务高质量发展研究

目前,我国经济已由高速增长阶段转向高质量发展阶段,我国高等教育也同样迈入高质量发展和现代化阶段,高等教育现代化必然要求高质量的后勤物业服务与之相适应。本文基于高校物业特点及服务场景分析,在高校物业服务企业实践的基础上,提出了高校物业服务标准化的标准体系框架及实施路径,为推动高校后勤物业高质量发展提供了指导和对策建议。

基于SWOT分析的高校图书馆知识产权信息服务策略研究——以华南师范大学图书馆为例

在国际竞争中,知识产权拥有重要的地位,高校图书馆作为重要的知识产权信息公共服务体系,有效开展知识产权信息服务是非常具有研究价值的课题。本文以华南师范大学图书馆知识产权信息服务为例,通过调研高校图书馆服务现状,运用SWOT分析法分析高校图书馆知识产权信息服务的内部优势和劣势、外部机会和威胁,提出了:抓住机遇,服务科研;深化基础服务,拓展高级服务;加强合作,优化服务;提升能力,保证质量等图书馆知识产权信息服务策略。

基于中外文献关键词网络分析的知识产权信息服务研究

知识产权信息服务是加强知识产权强国建设,支撑国家参与全球化竞争的重要途径。利用文献可视化工具,通过高频关键词共现、聚类、突现分析,对2013-2022年知识产权信息服务领域发表的中外文相关文献进行对比,探索近10年该领域研究现状、热点和发展趋势的差异。研究发现,专利分析仍然是知识产权信息服务的核心内容;国内图书馆尤其是高校图书馆成为知识产权信息服务网点之一;中外文文献都十分关注知识产权信息服务平台建设、公共服务体系建设。相比之下,中文文献重点针对用户需求提升服务能力、服务效果等,对知识产权信息服务的商业模式探索较少,对版权、商标关注不够。从近10年的研究主题演进阶段中可以看出,中文文献中知识产权信息服务领域研究起步于科技查新,在平台建设中不断完善,初步构建服务体系。而外文文献则关注新技术在知识产权信息服务中的应用,重视专利分析、版权以及信息安全等相关问题。

新时代我国产业知识产权信息服务现状问题及服务内容创新研究

本文对我国产业知识产权信息服务现状展开综览式调查,总结现有服务中的优势和缺点,对不足之处产生的原因进行溯源分析,并面向产业发展全链条中六类不同的服务对象群体进行了有关服务需求的深度访问。在研究结果的基础上对我国产业知识产权信息服务内容创新提出建议:以用户需求为导向,将专利信息分析业务、专利运营业务、专利数据库等功能进行整合,打造产业知识产权信息一站式服务模式,通过创新服务内容及定制个性化服务清单来实现服务提质增效,同时集合高端人才,以产业智库的形式对服务进行人才反哺。

公立医院物业外包服务全生命周期管理

医院物业服务外包项目通常为2-3年一个周期,本文从项目招标阶段、合同执行阶段、项目交接阶段进行分析,以广州医科大学附属第二医院为例,探讨公立医院物业外包服务全生命周期管理关键点及其策略。

知识产权贸易对经济“双循环”发展的影响——基于“一带一路”沿线国家面板数据的经验证据

选取涵盖中国在内的“一带一路”沿线49个国家2007—2021年面板数据,将“贸易—经济”关系研究视角拓展于知识产权贸易,探讨知识产权贸易对经济“双循环”发展的影响及作用机制。研究表明:“一带一路”沿线国家知识产权贸易对经济“双循环”发展呈现先抑制、后促进的“U”型影响,且经由稳健性检验后该结果依旧成立。“一带一路”沿线国家知识产权贸易通过结构效应、规模效应与技术效应,深入作用于经济“双循环”发展。异质性分析发现,经济发展水平越高、数字服务贸易自由化程度越深,知识产权贸易对经济“双循环”发展的影响越明显。

高校知识产权信息服务助力地方经济发展研究——以井冈山大学知识产权信息服务中心为例

【目的】探索新时代地方高校知识产权信息服务助力地方经济发展的现状及建议,以期对相关领域工作提供一些借鉴。【方法】以井冈山大学知识产权信息服务中心为例,通过图书馆知识产权信息服务实施情况,从内容概要、区域分布、服务模式、定位分析4个维度,明晰图书馆知识产权信息服务内容建设的关键所在。【结果】提出夯实基础,持续发力;提前谋划,强化队伍;依托学科,转型拓展;合作共享,协调发展等加强高校图书馆知识产权信息服务的建议。【结论】在知识产权信息服务能力薄弱的中西部地方高校,应该走一条兼顾高校科研、国家战略和区域经济发展的创新之路:梳理高校知识产权信息服务体系,突出知识产权信息服务高校科技创新和成果转化的目标,发挥知识产权信息服务在知识产权全链条中的作用和效能。