Investigation of the process of electron beam welding in an external magnetic field

The process of electron beam welding of stainless steel in a strong magnetic field is investigated. It is shown to be possible to suppress the fluctuations of the penetration depth in the root part of the welded joint in electron beam welding of non-magnetic metals and alloys. The fluctuations are suppressed by restricting the penetration depth by rotating the electron beam. A permanent dipole magnet with a rapidly decreasing magnetic field is used to distort the trajectories of the electron beam and rotate it.     

Raman spectroscopic analysis of L‐phenylalanine and hydrolyzed eggwhite protein penetration into keratin fibers

To investigate the penetration of amino acids and hydrolyzed protein derived from eggwhites (HEWP) into keratin fibers, the structure of cross‐sectional samples at various depths of virgin white human hair treated with L ‐phenylalanine (Phe) and bleached black human hair treated with HEWP was directly analyzed without isolating the cuticle and cortex using Raman spectroscopy. The hydrophobic amino acids clearly penetrated into the virgin white human hair, while hydrophilic amino acids did not penetrate at all. The Phe hydrophobic amino acid content at various depths of the virgin white hair increased by performing the Phe treatment (at 50°C for 16 h), indicating that Phe deeply penetrated into the virgin human hair. Also, the disulfide (? SS? ) and random coil contents at various depths of the bleached human hair increased by performing the HEWP treatment, indicating that HEWP also deeply penetrated into the bleached human hair. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

回填土强夯地基检测实例分析

对某人工回填土强夯地基的静载荷试验及动力触探结果进行了分析,分析的结果表明对于人工回填土场地强夯质量的评价不能仅仅依靠平板静载荷试验,只有采用静载荷试验与动力触探相结合的方法才能更加准确地评价回填土体的承载力特性,发现有可能存在的加固深度不足等问题。     

煤粉防粘砂机理及煤粉代用品的发展

叙述了煤粉在型砂中的作用及煤粉的防粘砂机理，即气膜理论、焦碳膜理论、氢气还原理 论和光亮碳理论，介绍了煤粉对于型砂和环境的危害，以及煤粉代用材料在国内外的发展．     

静探和标贯在开封地区岩土勘察中的应用

本文作者根据多年来的工作经验，总结了一些常用的静探和标贯与土的状态及物理力学性质的关系，提出了具体的结论和意见，供同行们参考。     

信息化技术在电工培训中的渗透研究

信息化技术在电工培训中的渗透，创新了电工培训模式。电工培训和信息技术相融合，提高了电工培训的效率和质量，为社会培养出优秀的电工技术人才。为适应社会对技术人才的需要，研究信息化技术在电工培训中的渗透，具有重要的现实价值。     

地质雷达在含块石填土场地探测中的应用

该文介绍了海南某回填场地,采用地质雷达(GPR)技术快速进行勘探,查明了填土层内块石的具体位置、埋藏深度和分布范围,为地基处理设计方案及时调整提供了可靠的依据.应用实例表明,采用GPR技术能够准确和有效地分辨出土层中的块石类障碍物,GPR是一种适宜大面积场地内解决工程地质问题的可行方法.     

HPLC 在杀虫剂表皮穿透研究中的应用

采用反相液相色谱法，选用EclipseⅪB-C     

Pasta preference and ability to penetrate through packaging of Sitophilus zeamais Motschulsky (Coleoptera: Dryophthoridae)

Results of bioassays of the maize weevil, Sitophilus zeamais, on different types of special commercial pasta are reported. The attraction to eight types of pasta was compared: barley and buckwheat, dietetic, egg pasta, gluten-free, spelt and lentils, tricolour pasta (a mixture of semolina, tomato, and spinach), vitamin enriched, and whole wheat semolina. The results obtained demonstrated that adult S. zeamais revealed significant preferences for whole wheat semolina and tricolour pasta, followed by vitamin enriched pasta, egg pasta, spelt and lentils pasta, gluten-free pasta, barley and buckwheat pasta, and dietetic pasta. The ability of S. zeamais to penetrate packages of commercial pasta was also determined using a folded carton box or a plastic pillow pouch with or without gussets. Sixteen types of commercial pasta packages were compared. S. zeamais was found inside packages of barley and buckwheat pasta, durum wheat pasta, egg pasta, five cereals pasta, kamut pasta, rice pasta, spelt pasta, spelt and lentil pasta, tricolour pasta, vitamin enriched pasta, and whole wheat pasta. The adults entered into carton boxes and infested the pasta through openings not well sealed by glue. The large or enlarged air vent micro-holes present on polypropylene pasta packages facilitated the entry of adults.     

某建筑场地的划分及其地基承载力的应用研究

根据等效剪切波速值对该建筑场地的各土层进行了划分,在此基础上利用室内土工试验、岩石抗压强度试验和现场静力触探等室内和实测资料进行分析计算,并结合有关规范与标准,得出了徐州市某一黄金地段户部商都地基承载力的推荐值和设计需要的相关参数,这为基础设计提供了十分重要的依据。