硬PVC异型材生产技术

介绍了硬ＰＶＣ异型材生产配方、工艺流程及性能指标     

炭素成型热媒炉热效率分析及提高

本文主要介绍了有机热载体加热炉系统在炭素厂阳极成型生产中的应用,分析了热媒系统的结构特点、热工特点,同时重点对该系统的热故率进行了分析,提出了提高热媒锅炉热效率的措施.     

超级纤维清扫液工艺的应用

为解决水平井、大斜度井等特殊情况下的井眼清洁问题,采用了雷特超级清洁纤维作为处理剂.雷特超级清洁纤维是一种由100%白色原生材料单纤维丝聚丙烯,经过特别处理的人造纤维,呈单纤维丝纤维形态,密度为1.0 g/cm3并具有安全环保、惰性、高分散性、超强悬浮性等特性,利用其在钻井液中分散后形成高的机械悬浮、携带能力来满足清洁需要.通过在玉门油田的应用表明,雷特超级纤维清扫液配制简单,具有超强携带能力,对特殊情况下的井眼清洁具有显著功效,能有效减少井下复杂和事故;不污染钻井液,返出后井浆中的清洁纤维全部由振动筛除去;雷特超级纤维用量少,综合成本低,完全能满足特殊情况下的清洁要求.     

用“爱”构筑旅游专业文化魂

旅游的真谛就是“爱”。爱的涵义包括：爱是宽容，爱是包容，爱是兼容。从旅游管理与土地资源管理融合、与市场营销融合、与工商管理融合等3步完成旅游学科支持体系的构建。海纳百川的包容性和善待一切的大情怀作为专业文化魂，应体现在旅游专业活动的各个方面。     

纳米材料的制备及应用前景

综述了纳米材料的结构性能及其常用的制备方法，通过分析国内外的相关资料，概述了纳米材料在化工环保和生物医学及医药等领域的应用现状和前景，并提出纳米对可持续发展作出较大贡献的观点。     

LDA端泵浦短腔Cr^4＋：YAG被动调Q Nd：YAG激光器

采用峰值功率600W的准连续（QCW）激光二极管阵列（LDA）端泵浦Nd:YAG晶体，其耦合装置为自制的微柱透镜阵列和透镜导管，使用Cr^4 :YAG可饱和吸收晶体作为Q开关，并选取长度较短的Nd:YAG晶体，从而使激光腔的长度缩短到11mm，实验研究了在较短的腔长条件下调Q输出多脉波形的时间、空间分布，采用平－平腔结构时，每次泵浦脉冲获得单脉冲输出，脉冲宽度＜4ns，能量4．5mJ。     

脉动阵列执行Kalman滤波计算

本文从并行的观点出发，综述了用脉动（Ｓｙｓｔｏｌｉｃ）阵列实现标准Ｋａｌｍａｎ滤波、平方根滤波、平方根信息滤波和扩展Ｋａｌｍａｎ滤波计算，文中还分析了各种阵列结构的大小，计算速度和处理器的利用率。     

Effect of age on protein conservation during very-low-energy diet in obese Sprague-Dawley rats

Perillyl alcohol is a monoterpene isolated from the essential oils of lavendin, peppermint, spearmint, cherries, celery seeds, and several other plants. In animal studies it has been shown to regress pancreatic, mammary, and liver tumors, to exhibit possible application as a chemopreventative agent for colon, skin, and lung cancer, and as a chemotherapeutic agent for neuroblastoma, and prostate and colon cancer. Perillyl alcohol is active in inducing apoptosis in tumor cells without affecting normal cells and can revert tumor cells back to a differentiated state. Its mechanism of action is unclear, but it has actions on various cellular substances which control cell growth and differentiation. It has been shown to increase mannose-6-phosphate/insulin-like growth factor II receptors, increase tissue growth factor beta receptors, increase Bak, decrease ras protein prenylation, decrease ubiquinone synthesis, and induce Phase I and Phase II detoxification systems. Preliminary human trials have not demonstrated tumor regression at a four times daily dosage schedule. In addition, significant side-effects, mainly gastrointestinal, have been experienced.     

Cholinergic regulation of the suprachiasmatic nucleus circadian rhythm via a muscarinic mechanism at night

In mammals, the suprachiasmatic nucleus (SCN) is responsible for the generation of most circadian rhythms and for their entrainment to environmental cues. Carbachol, an agonist of acetylcholine (ACh), has been shown to shift the phase of circadian rhythms in rodents when injected intracerebroventricularly. However, the site and receptor type mediating this action have been unknown. In the present experiments, we used the hypothalamic brain-slice technique to study the regulation of the SCN circadian rhythm of neuronal firing rate by cholinergic agonists and to identify the receptor subtypes involved. We found that the phase of the oscillation in SCN neuronal activity was reset by a 5 min treatment with a carbachol microdrop (1 microliter, 100 microM), but only when applied during the subjective night, with the largest phase shift (+ 6 hr) elicited during the middle of the subjective night. This effect also was produced by ACh and two muscarinic receptor (mAChR) agonists, muscarine and McN-A-343 (M1-selective), but not by nicotine. Furthermore, the effect of carbachol was blocked by the mAChR antagonist atropine (0.1 microM), not by two nicotinic antagonists, dihydro-beta-erythroidine (10 microM) and d-tubocurarine (10 microM). The M1-selective mAChR antagonist pirenzepine completely blocked the carbachol effect at 1 microM, whereas an M3-selective antagonist, 4,2-(4,4'-diacetoxydiphenylmethyl)pyridine, partially blocked the effect at the same concentration. These results demonstrate that carbachol acts directly on the SCN to reset the phase of its firing rhythm during the subjective night via an M1-like mAChR.