FDFiles：寻找“死去”的文件

寻找并删除系统中废弃的文件 废弃无用的文件会在你的系统中日积月累。它们可能是早已升     

天馈线故障分析与处理

我台播出中一电视的发射机连续出现功放保护现象，拉掉发射机高压，保护指示灯不停闪烁，减小激励器功率后再加高压发射机正常，逐渐加激励到所需激励的40％～50％左右时，又重新出现功放保护，拉掉高压。将发射机输出倒在负载上，发射机正常，激励可以加到90％以上，分析故障现象表明问题可能出在天线上。     

以煤粉作橡胶填料的新观点

0 前言目前,人们正加紧改进胶料性能、减轻重量和降低成本。这种趋势,在汽车用橡胶制品和工业制品领域显得格外重要。它导致了重新研究从研磨的煤粉作为功能填料,以减轻制品重量并改进某些使用性能。本文将通过研磨煤粉和其他常用填料的对比,讨论降低胶料比重的基本原理,以说明随     

重新评价沉积盆地中超压的形成机制

超压可由以下过程产生：（１）压应力增加；（２）孔隙流体或岩石基质的体积变化；（３）流体运移或浮力作用，由于不均衡压实作用，在埋藏过程中上覆沉积物我荷下产生相当大的超压，尤其是在低渗透性沉积物的快速沉降过程中更易产生超压。在构造活动区，水平应力的变化可以快速形成交释放大量的超压，由体积变化引起的超压机制必须具备完好的封闭是有效的，由水热膨胀和黏土脱水造成的流体体积增加量很上，它不能形成较大的超压，除     

现代生物控制：天敌的经营

生物控制包含用某些生物压制另一些。这种控制包含繁育具有抗病的作物,或犁翻植物残骸使颉颏性微生物能压制病原体。然而商业上更感兴趣的是集中在害虫感染面积上建立新的有益生物,诸如捕食者,以及释放出大数量的土生的能在短期内控制害虫的生物。 杂草、害虫或致病剂的天敌包括细菌、真菌、昆虫和其他节肢动物以及线虫。某些有控制能力的物种能生长在泥炭中,以泥炭作载体贮藏和施用,或用于泥炭堆肥。 生物控制是害虫管理整体的一部分,需要更多类型的天敌和更加商业上便于交易的途径。     

铬铁矿固态还原

铬铁矿固态还原Ｍ．Ｊ．ＮＩＡＹＥＳＨ（南非兰德堡明泰克公司）本文论述的这项工作是应用外热式竖炉进行的合成铬铁矿球团还原，并确定了技术可行性。在研究生产Ｆｅ－Ｃｒ－Ｃ系合金的各种方法中，尝试了利用富氧喷煤熔炉的炉气进行铬铁矿预还原。确定的合成铬铁矿球团...     

Dynamic proteome in enigmatic preeclampsia: an account of molecular mechanisms and biomarker discovery

The coevolution of genomics and proteomics has led to advancements in the field of diagnosis and molecular mechanisms of disease. Proteomics is now stepping into the field of obstetrics, where early diagnosis of pregnancy complication such as preeclampsia (PE) is imperative. PE is a multifactorial disease characterized by hypertension with proteinuria, which is a leading cause of maternal and neonatal morbidity and mortality occurring in 5-7% of pregnancies worldwide. This review discusses the probable molecular mechanisms that lead to PE and summarizes the proteomics research carried out in understanding the pathogenicity of PE, and for identifying the candidate biomarker for diagnosis of the disease.     

Modeling of the electrostrictive, dielectric, and piezoelectric properties of ceramic PbTiO(3)

The upper and lower limits of the electrostrictive constants, dielectric permittivities, spontaneous polarizations, and piezoelectric coefficients were calculated for ceramic PbTiO(3) from theoretical single-crystal constants. Experimental ceramic data fall between these upper and lower limits. The large piezoelectric anisotropy d(33)/d(31) of ceramic PbTiO(3 ) was shown to be related to the single-crystal PbTiO(3) electrostrictive anisotropies Q(11)/Q(12 ) and Q(44)/Q(12). The possibility of a change in sign of the ceramic d(31) coefficient due to a slight variation in the single-crystal electrostrictive anisotropies was discussed. The single-crystal and predicted ceramic hydrostatic electrostrictive constants were found to be equal. Using this result the ceramic hydrostatic g(h ) coefficient is always smaller than the single-crystal g (h), but the ceramic hydrostatic d(h) coefficient can be either larger or smaller than the single-crystal d(h) depending on the dielectric anisotropy (epsilon (11)/epsilon(33)) of the single-crystal.