Enhanced magnetic properties of FeSiAl soft magnetic composites prepared by utilizing phosphate: PSA as insulating layer

Journal of Materials Science: Materials in Electronics - The phosphating treatment method has been extensively applied in the field of insulating soft magnetic powders because of its simplicity and...     

Proper Management of Standardization to Promote the Development of Marine Environment Protection

Marine environment protection is an important aspect of environmental protection in China.The role of standards in marine environment protection,the government's regulation of the marine environment,and supporting economic and social development will become increasingly prominent.This article outlines the circumstances and standardization of marine environment protection,construction of the standards system for marine environment protection and prospects for standardization of marine environment protection.     

传统模拉拔与压力模拉拔的实验比较

国外实验研究表明：使用压力模进行钢丝拉拔时,由于润滑剂在压力状态下润滑,因而与传统拉丝模拉拔相比,在使用同种润滑剂时摩擦因数减小４８％,拉拔应力降低２０％左右。拉拔后的钢丝力学性能也明显提高     

基于Android平台的图书馆图书服务系统的研究

基于中国移动图书馆的发展现状,及国内大学图书馆的实际需求,提出了基于Android平台的图书馆服务系统的体系结构设计,阐述了基于Android平台的图书馆管理系统的设计思想、开发模型、主要功能模块以及关键技术的设计与实现.使用户可以通过手机客户端访问,实现图书查询、预约、续借、推荐借阅等功能.该系统的实现与传统的Web应用进行了良好的互补,更加贴近学生的生活.     

Respiration,pectolytic activity and textural changes in ripening African mango (Irvingia gabonensis) fruits

Post-harvest changes in fruit firmness, respiration, pectinesterase (PE) and polygalacturonase (PG) activities were followed in African mango fruits during storage ripening at tropical ambient conditions (28±1°C and 68±2% RH). Respiration followed a climacteric pattern attaining a peak of 99·37 ml CO₂ kg^?1 hr^?1 on the fifth day of storage while full ripeness (colour index—5) was attained on the tenth day. PE and PG activities increased with progressive fruit ripening attaining their optima on the fifth day (1·8 PE unit) and tenth day (27 PG units), respectively. Fruit firmness decreased as pectolytic activity increased with a concomitant reduction in the deformation force from 49 kPa in the unripe fruit to 25 kPa at the edible ripe stage.     

Heterojunction InAlAs/InP MESFETs grown by OMVPE

Lattice-matched InAlAs/n-InP and InAlAs/n⁺-InP heterostructure MESFETs with extrinsic transconductances of 220 and 155 mS/mm, respectively, have been fabricated on semi-insulating InP substrates. Maximum stable gains of 11.5 dB for the 1.25-μm-gate n-InP channel and 10 dB for the 1.0-μm-gate n⁺-InP channel devices were measured at 10 GHz. An extrapolated f_max of 42 GHz was obtained for the n⁺-channel MESFET     

Internal migration and educational outcomes in Italy: Evidence from a cohort of youths

This paper analyses the educational outcomes and the human capital accumulation of a cohort of youths, focusing on their family origin. Using a unique survey of a Northern Italian province traditionally interested by large internal migration inflows especially from the South, we find that migrants' children have a higher probability of early dropout, especially in the case of males. This evidence calls into question the integration of internal migrants, for whom education plays a crucial role, even in a period in which foreign immigration seems to be of major concern.     

Profibus总线系统的设计探讨

结合工程实例，介绍了现场总线的分类，具体给出了Profibus总线的设计方法。根据总线中各节点的不同特点，提出了中继器的具体实施方案。最后讨论了Profibus专用电缆。     

高压聚乙烯树脂19G的研制与应用

针对市场需求及行业发展,介绍了某公司高压装置生产LDPE涂覆用聚乙烯树脂19G的研制过程与应用.对研发产品的技术方案、聚合调整措施以及管式法工业生产方法进行了阐述,同时与1C7A、18G等涂覆树脂进行结构和性能对比分析,通过调整优化高压装置聚合工艺条件研发生产19G产品,经多家客户的加工试验,表明19G产品用于编织袋表...