构件杂散损耗问题的分析和基准模拟试验

提出并建立了一个面向变压器工程的杂散损耗基准模型，该模型已被国际ＴＥＡＭ指导委员会批准为第２１基准问题。描述了Ｐｒｏｂｌｅｍ２１的基本特征，介绍了所进行的三维涡流，磁通密度杂散损耗的分析与测量的关键技术和部分结果。基于Ｐｒｏｂｌｅｍ２１进一步建立了模拟变压器铁心非磁负钢拉板涡流损耗的模型，得到了一些有价值的分析和试验结果。     

一种局域网安全管理的方法

局域网的安全管理是目前许多安全问题的焦点,作者将局域网的安全管理分为局域网出入口管理、局域网内部管理、数据的保护三个方面。并从这三个方面进行阐述和解释,解释了如何从这三个方面将局域网的安全管理性能提高到一个新的档次。     

Microstructures and mechanical properties of hot-pack rolled Ti-43Al-9V-Y alloy sheet

Ti-43Al-9V-Y alloy sheets with dimensions of 300 mm×100 mm×(1.5–2) mm were produced by hot-pack rolling. After rolling, the microstructure of Ti-43Al-9V-Y alloy sheet becomes near gamma(NG), which is comprised of γ+B2 phases. After heat treatment(HT) at 1 200−1 320 °C for 30 min followed by furnace cooling(FC), network shape structure of B2 phases in as-rolled microstructure is retained on the whole. Moreover, with increasing the HT temperature, precipitation of B2 phase lamellae in equiaxed γ grains is increased. Equiaxed γ grains transform partly to α₂/γ/B2 lamellar structure after the heat treatment at 1 320 °C for 30 min. Tensile test results show that room-temperature yield strength(YS) and ultimate tensile strength(UTS) of the as-rolled material are 509 and 612 MPa, respectively. With the test temperature increasing, the YS and UTS of the as-rolled are decreased, but the elongation is improved. After HT at 1 200 °C, both yield strength and fracture strength of Ti-43Al-9V-Y alloy sheet are the lowest. With HT temperature increasing, fracture strength is increased obviously, but yield strength of the sheet after HT at 1 280 °C is the highest, about 869 MPa.     

一种改性生物炭材料的制备及其在土壤污染降解中的应用

针对传统重金属吸附剂生物炭存在吸附能力差的问题，通过羟基磷灰石改性生物炭，并将其用于土壤中重金属离子的去除。实验以美国标准毒性浸出方法 TCLP为评价指标，验证改性生物炭对土壤中重金属的净化效果。实验结果表明，改性生物炭材料投加量为8%时，处理的重金属污染土壤符合GB 5085.3-2007标准要求，稳定90d后，pH值仍旧满足适宜土壤微生物生存的6.5～9.5酸碱度要求，表现出良好的降解性能。