探讨如何提高环境监测的质量

环境监测的主要目的是为了保证人类能够居住在一个健康的生态环境之中,并可以使他们能够合理安全地使用自然资源,所以我们要通过多项措施,建立起完整的质量保证体系、完善和实践实验室认可制度、提高内部检测人员的素质,使他们自觉的适应环境管理的各项要求等,来提高环境监测的最终质量。     

铅酸起动蓄电池组IEC60095:2006与2000版标准差异

本文主要介绍了IEC 60095-1铅酸起动蓄电池组-第一部分:一般要求和测试方法2006年版与2000年版试验方法和要求的差异比照.     

企业检测实验室管理体系的建设与认可

企业检测实验室在产品质量控制,缩短产品研发周期发挥了重要作用.随着我国企业技术力量的不断提高,在产品标准制修订和标准应用方面积累了丰富的经验,越来越多的企业筹建了产品检测实验室.本文通过阐述企业检测实验室的建设与认可步骤,探索企业成功实施实验室管理体系的关键要素.     

环保试油技术探索

为避免试油过程中产生的落地油、油砂、油水混合液和洗井液等对环境造成的污染,新疆油田公司试油公司研制出绿色环保试油技术,包括抽汲防井口泄油液、油管刮油、油管泄油、试井防喷、快速防喷、压裂放喷液回收等试油技术,在施工全过程中采取了预防污染的措施,将生产技术、生产过程、和环境保护等有机结合起来,实现最小的环境影响、最优化的经济效益和社会效益。     

Stationarity: Wanted Dead or Alive?1

Lins, Harry F. and Timothy A. Cohn, 2011. Stationarity: Wanted Dead or Alive? Journal of the American Water Resources Association (JAWRA) 47(3):475‐480. DOI: 10.1111/j.1752‐1688.2011.00542.x Abstract: Aligning engineering practice with natural process behavior would appear, on its face, to be a prudent and reasonable course of action. However, if we do not understand the long‐term characteristics of hydroclimatic processes, how does one find the prudent and reasonable course needed for water management? We consider this question in light of three aspects of existing and unresolved issues affecting hydroclimatic variability and statistical inference: Hurst‐Kolmogorov phenomena; the complications long‐term persistence introduces with respect to statistical understanding; and the dependence of process understanding on arbitrary sampling choices. These problems are not easily addressed. In such circumstances, humility may be more important than physics; a simple model with well‐understood flaws may be preferable to a sophisticated model whose correspondence to reality is uncertain.     

新型阻燃防护服的研发及其性能测试

本文对使用新型纤维材料研发阻燃防护服装的主要工艺,包括各层面料的选择、层次的搭配,参数的确定以及不同层次间的复合进行了分析。同时还对阻燃防护服装应该达到的国家及国际标准、在进行测试时所需要的仪器及测试方法、阻燃防护服装应达到的性能指标进行了详细介绍。     

Pericentric inversion of chromosome 19: prenatal diagnosis and genetic counselling

During prenatal diagnosis for advanced maternal age, a pericentric inversion of a chromosome 19 was detected in a male fetus. The inversion was familial, transmitted to the fetus by the phenotypically normal mother. The pregnancy resulted in a term birth of a phenotypically normal male infant. Inversion 19 appears to be a rare abnormality with only seven families reported thus far including ours. Infants with duplication deficiencies for chromosome 19 have not been reported in these families. This may suggest an apparent suppression of crossing over and recombination within the inverted segment of chromosome 19 during meiosis.     

Prenatal diagnosis of zellweger's syndrome by chorionic villus sampling-and a caveat

At 7·5 weeks gestation, two small chorionic villous biopsies were obtained from a woman at risk for Zellweger's cerebro-hepato-renal syndrome, and were separately established in culture. After 3 weeks, dihydroxyacetone phosphate acyltransferase (DHAP-AT) activity was measured in both cultures. The enzyme was markedly deficient in one cell strain and this was subsequently shown to have a male karyotype. However, the second culture had normal enzyme activity and a female karyotype. The pregnancy was terminated at 11·5 weeks gestation, and follow-up studies on fetal tissues confirmed a male fetus with markedly deficient DHAP-AT activity.     

Estimation of the weight of chorionic villus samples obtained from first trimester pregnancies by transcervical aspiration

Eight obstetricians experienced in chorionic villus sampling were asked to estimate the weight of samples of villi with and without a reference photograph. Referral to the photograph significantly improved the accuracy of their estimations.     

Prenatal identification of a Y-chromosome deletion by Y-specific single copy DNA probes

A sex chromosome deletion was identified in the course of prenatal diagnosis for maternal age. Ultrasound pictures revealed male fetal sex and a comparison with the father's Y chromosome suggested that the altered chromosome might be a de novo deletion of the Y chromosome. DNA hybridization with five human Y-specific probes shows that, among the Y-specific sequences recognized by the probes, only two of them are absent. The normal infant, at birth, was mosaic 46, XYq- /46,XY.