氨棉包芯纱性能测试初张力确定方法

文中把包芯纱性能测试时需要加的初张力分为两部分：第一部分是棉纱伸直而不伸长的平衡初张力Ｓｃ，按传统棉纱的国际选定；第二部分是包芯纱在伸直但不伸径的状态下氨纶丝的平衡力Ｓｓ，要通过计算包芯纱平衡状态时氨纶线的但长率，再由氨纶丝的拉伸强力伸长率曲线确定，测试结果证实这是一个精确有效的初张力确定新方法。     

溴系阻燃剂与环境保护及人类健康

阐述了溴系阻燃剂（BFR），特别是多溴二苯醚（PBDPO）对环境保护及人类健康的影响和危害，包括BFR从阻燃材料中的逸出、在环境中的滞留、在生物体内的积累、燃烧产物的毒性等有关问题，并介绍了有关十溴二苯醚应用前景的最新信息。     

RF MEMS variable attenuators with improved dB-linearity

Microsystem Technologies - A variable attenuator is one of the essential components in radio frequency (RF) systems, such as automatic gain control amplifiers and full-duplex systems. Variable...     

注水井试井中的非等温效应

以往大部分注水井测试方法是基于等温模型，理论述了Bensen和Bodvarsson及Woodward和Thambynayagam提出的非等温注水井单相试井模型及温度和压力的积分解，给出在Peclet数相当小时的温度和压力近似解,并与等温情况下的Theis解进行了比较，结果表明，注入期间温度变化效应相似于随后的渗透性变化的效应，该模型可用于间断注水井的不稳定温度和压力测试解释。     

混沌信号相关维提取的一种改进方法

相关维是描述混沌信号的一个重要参数,论文对相关维提取算法进行了深入的研究,结合流行的GP算法给出了一种提取相关维的改进算法。该算法具有运算量小、精度高、尺度选择盲目性小等特点。     

Inhibition of 7,12-dimethylbenz[a]anthracene induced mouse skin carcinogenesis by Artemisia capillaris

ABSTRACT:  Anticarcinogenic activity of medicinal herbs ( Artemisia capillaris, Taxus cuspidata, Anthriscus sylveatris, and Curcuma longa ) was examined for 7,12-dimethylbenz[a]anthracene (DMBA)-induced mouse skin carcinogenesis. Four types of solvent fractions (hexane, chloroform, ethyl acetate, and butanol) were prepared from the methanolic extract of medicinal herbs. The cytotoxicity and anticarcinogenic activities of solvent fractions were examined for mouse leukemia L1210 cancer cells and for female ICR mouse epidermal carcinogenesis induced by DMBA, respectively. The chloroform fraction of Artemisia capillaris, Taxus cuspidata, and Anthriscus sylveatris was more toxic to L1210 cells than other solvent fractions. The chloroform fraction of Artemisia capillaris markedly reduced the number of tumors/mouse and tumor incidence relative to that of other medicinal herbs tested. Major active chemical constituents in the chloroform fraction of Artemisia capillaries were found to be camphor, 1-borneol, coumarin, and achillin when analyzed by TLC and GC-MS. These results suggest that Artemisia capillaris was the most effective anticarcinogenic medicinal herb for DMBA-induced mouse epidermal carcinogenesis among 4 medicinal herbs tested, and the effect might be attributed to chemical compounds of camphor, 1-borneol, coumarin, and achillin.     

Differential expression of superoxide dismutases containing Ni and Fe/Zn in Streptomyces coelicolor

Streptomyces coelicolor contains two distinct superoxide dismutase (SOD) activities detected on native PAGE. The level of each changed differently depending on growth media and scarcely responded to paraquat, a superoxide-generating agent. The total SOD activity doubled in late exponential phase compared with that in mid-exponential phase and less than double upon treatment with plumbagin, another superoxide-generating agent. The two SODs from S. coelicolor ATCC 10147 (Müller) strain were purified to near homogeneity. SOD1, a tetramer of 13.4-kDa subunits, was found to be a novel type of SOD containing 0.74 mol nickel/mol subunit as determined by atomic absorption spectroscopy. SOD2, a tetramer of 22.2-kDa subunits, was found to contain 0.36 mol iron and 0.26 mol zinc/mol subunit. The N-terminal amino acid sequences of both SODs were determined. SOD2 is similar to manganese-containing superoxide dismutases (MnSODs) and iron-containing superoxide dismutases (FeSODs) from other organisms, whereas SOD1 is less similar to known SODs but still contains a few conserved amino acids. The effects of metals and chelating agents on the expression of these two SODs were examined. The presence of nickel at micromolar concentrations in growth media induced the expression of SOD1 (nickel-containing superoxide dismutase; NiSOD), whereas the expression of SOD2 (iron/zinc-containing superoxide dismutase; FeZnSOD) was repressed. The changes in SOD activities were positively correlated with the amount of each enzyme as determined by immunoblotting, suggesting that metals do not modulate the activity per se but the amount of each protein.     

Progression-regression effects in tracking repeated patterns.

Subjects used a position control system to perform compensatory tracking of a repeated input pattern. Tracking error was roughly proportional to the velocity of the input signal. Error magnitude decreased with practice and increased with the addition of a concurrent memory task. These effects can be modeled as progressive and regressive changes in how well subjects used control movement velocity and displayed error velocity to anticipate the input pattern and thereby reduce their effective time delay. The weighting of velocity cues in this model progressed with practice and regressed with the secondary task, even though the secondary task required no concurrent visual scanning or simultaneous motor response. This regression effect appears to indicate cognitive interference with the anticipation process. Stationary linear models provide a good approximation to the movement patterns; however, these models do not account for episodes of rapid pulse-like movements that were revealed in the ensemble-averaged trajectories. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Improvement of sugar recovery from <Emphasis Type="Italic">Sida acuta</Emphasis> (Thailand Weed) by NaOH pretreatment and application to bioethanol production

Sida acuta, a common type of weed in Thailand, contains relatively high cellulose (42.7%) content. We pretreated NaOH to improve glucose recovery from S. acuta. The effect of pretreatment temperature and NaOH concentration was fundamentally investigated based on hydrolysis efficiency with recovery of solid fraction. The pretreatment condition was determined to be 3% NaOH at 60 °C for 9 h, which showed the highest glucose recovery. The hydrolysates obtained by enzymatic hydrolysis of S. acuta were applied to the fermentation of Saccharomyces cerevisiae K35, and a theoretical yield of 97.6% was achieved at 18 h. This indicated that the hydrolysates medium without detoxification had no negative effects on the fermentation. The production of biomass into bioethanol was evaluated based on the material balance of 1,000 g basis. Following this estimation, approximately 28 g and 110 g bioethanol could be produced by untreated and pretreated S. acuta, respectively, and this production was improved about 3.9-fold by NaOH pretreatment. These results again show the importance of pretreatment in biorefinery process.