数据存储与24C08应用实践

数据存储是智能系统中重要的组成部分,数据的可靠存放与提取是一项关键技术。在应用实践的基础上,介绍了24C08读写的时序特点,以及在实践过程中出现的问题,并给出了经过调试的24C08读写汇编程序。     

地理信息元数据及系统

作为数字地球重要支撑技术之一的地理信息元数据技术随着信息技术的飞速发展显得越来越重要。该文对现有的典型地理信息元数据内容和标准以及实现系统进行了分析和综合比较,然后对地理信息元数据内容与标准的制订、地理信息元数据系统的建设提出了一点思考,希望能够对相关的研究有所启发。     

溶胶-凝胶法制备锌掺杂Sr_3Co_2 Fe_(24)O_(41)Z型铁氧体及其性能

利用柠檬酸溶胶-凝胶法合成了锌掺杂Sr_3(Zn_xCo_(1-x))_2Fe_(24)O_(41),(x=0～0.8)的Z型铁氧体.测试其结构、磁性能、电磁性能与吸波特性.实验结果表明,适量掺杂Zn~(2+)有利于磁性能及吸波性能的改善,在x=0.2时比饱和磁化强度最大,可达51.36 A·m~2·kg~(-1);吸波性能优良,最大吸收量为35.12dB;合成最佳温度为1200℃烧结2小时.     

L80-9Cr耐腐蚀油井管用钢基础特性研究

通过分析研究L80-9Cr耐蚀油井管用钢08Cr9MoVRE的基础特性检验结果,得出室温条件下轧制实验钢强度较高而塑性较差,金相显微组织为板条马氏体,轧制结束后需要及时回火;采用980℃淬火,720-780℃回火的热处理工艺后,试验钢各项性能指标满足L80-9Cr钢的技术要求。高温拉伸性能检测结果表明,试验钢加热到1225~1250℃时,变形抗力较低,延展性能较好,有利于穿孔变形;耐腐蚀性能检测结果显示,在同一腐蚀条件下试验钢08Cr9MoVRE平均腐蚀速率是普碳钢平均腐蚀速率的1/10。     

C＆C08交换机最小单元的组建及在实际工作中的应用

宣钢公司使用华为C＆C08数字程控电话交换机进行生产和经营的电话通信，为使维护人员对该设备能更深入地了解学习，建立一个交换机的最小单元，并可利用其进行设备维护学习、通信新业务自主开发等工作。     

Kinetics of aging process on reduced Ag exchanged mordenite in dry air and humid air

Aging effects of off-gas streams including dry air and humid air on reduced silver exchanged mordenite (Ag⁰Z) were studied. Aged Ag⁰Z was prepared by exposing Ag⁰Z to dry air and humid air at different aging temperatures, time, and water vapor concentrations. Iodine loading capacity on the aged Ag⁰Z was obtained through a continuous-flow adsorption system. Significant iodine loading capacity losses were observed after the Ag⁰Z was exposed to dry air and humid air. Physical and chemical analyses were conducted to observe the physical and chemical changes of Ag⁰Z after being aged. From iodine adsorption data and sample analyses, it was found that iodine loading capacity on the aged Ag⁰Z in dry air and humid air decreases with increasing aging temperatures, time, and water vapor concentrations. The pseudo reaction model describes experimental data well and the oxidation of Ag⁰ is the rate determining step in the aging process.     

Exploring e-mentoring: co-designing & un-platforming

ABSTRACT

The underrepresentation of women in the STEM workforce is a global issue. In Saudi Arabia, women constitute 48% of undergraduates in STEM, but their participation in STEM careers remains particularly low. We explored the current state of e-mentoring, and the potential for co-designing to enhance e-mentoring experiences for youth in the Saudi context. We report on how we sought to understand the opportunities, barriers and requirements of e-mentoring for young women in Saudi Arabia through (1) the application of a traditional programme of STEM e-mentoring, (2) workshops on the redesign of e-mentoring, and (3) a co-design activity as the first phase of an alternative e-mentoring process. The study demonstrated that the traits of the participants’ generation had a major effect on the findings; more so than cultural norms. This means that the findings have wider implications than just within the Saudi context. We identify a number of recommendations for designing e-mentoring programmes for young women and teenagers, including un-platforming traditional approaches to e-mentoring and the inclusion of co-design activities as a first step in the e-mentoring process.     

Benützung einer baulichen Anlage ohne Benützungsbewilligung; Fahrl?ssigkeit des Mieters

L?sst der Mietvertrag (hier: auf Grund des Hinweises, dass "die Einholung der Baubewilligung für die Gesamtanlage Sache des Bestandgebers ist") noch offen, ob die entsprechende Benützungsbewilligung bereits erteilt worden ist, erfordert es die Sorgfaltspflicht des Mieters (eines Büros in der Gesamtanlage), sich zu verge-wissern, ob eine Benützungsbewilligung bereits vorliegt.     

Characterization and modeling of creep mechanisms in Zircaloy-4

The deformation microstructure and creep mechanisms of Zircaloy-4 have been investigated. Four Zircaloy-4 specimens were tested at different temperatures and stress levels and the deformation microstructures of these specimens were analyzed using transmission electron microscopy. On the basis of microstructural observation of a-type screw dislocations in prismatic slip systems, the modified jogged-screw model has been applied as a rate controlling mechanism for creep of Zircaloy-4. In addition, the stress dependency of dislocation density, jog spacing, and jog height has been evaluated via modeling and experimental observations. The purpose of this study is to provide a detailed understanding of the creep deformation of Zircaloy-4 and prediction of creep rates in this alloy based on the microstructural information obtained from TEM analysis.     

Highly Active and Selective Semihydrogenation of Alkynes with the Palladium Nanoparticles‐Tetrabutylammonium Borohydride Catalyst System

Palladium nanoparticles are prepared from palladium(II) acetate and 2 equivalents of potassium tert‐butoxide in the presence of 4‐octyne. The palladium nanoparticles‐tetrabutylammonium borohydride system shows excellent catalytic activity and selectivity in the semihydrogenation of alkynes to the [(Z)‐]alkenes. The hydrogenation of 4‐octyne is conducted with the catalyst system at a substrate‐to‐palladium molar ratio of 10,000–200,000 under 8 atm of hydrogen to give (Z)‐4‐octene in>99% yield. Isomerization and over‐reduction of the Z‐alkene are very slow even after consumption of the alkyne.