1998年昌江流域暴雨洪水分析

1998年昌江发生了建国以来最大洪水，文章从天气环流背景、降雨特征等方面分析这次洪水形成的特点和发展过程。     

九江市1998年抗洪回顾与反思

通过九江市１９９８年汛情特点的分析，及抗击这次超历史洪水各项措施的总结，进行了深刻的反思     

1998年九江抗洪启示录

简述1998年江西特大洪水的基本情况，重点介绍了九江防洪的形势和九江长江城防堤4～5号闸口间堤段溃决的情况及堵口过程，并总结了经验教训和抗洪工作的体会．     

GB4706.1-2005与GB4706.1-1998第30章的主要差异浅析

本文列出了GB4706.1-2005与GB4706.1-1998在第30章的主要差异,并对这些差异进行了分析。     

对GB1499-1998钢筋混凝土用热轧带肋钢筋的标准探讨

阐述了对现行钢筋混凝土用热轧带肋钢筋标准GB14 99- 1998几点疑问 ,指出该标准的一些不足之处 ,并阐述了自己的观点。     

Dynamic Changes in Reactive Oxygen Species in the Shoot Apex Contribute to Stem Cell Death in Arabidopsis thaliana

In monocarpic plants, stem cells are fated to die. However, the potential mechanism of stem cell death has remained elusive. Here, we reveal that the levels of two forms of reactive oxygen species (ROS), superoxide anion free radical () and hydrogen peroxide (H₂O₂), show dynamic changes in the shoot apex during the plant life cycle of Arabidopsis thaliana. We found that the level of decreased and disappeared at four weeks after bolting (WAB), while H₂O₂ appeared at 3 WAB and showed a burst at 5 WAB. The timing of dynamic changes in and H₂O₂ was delayed for approximately three weeks in clv3-2, which has a longer lifespan. Moreover, exogenous application of H₂O₂ inhibited the expression of the stem cell determinant WUSCHEL (WUS) and promoted the expression of the developmentally programmed cell death (dPCD) marker gene ORESARA 1 (ORE1). These results indicate that H₂O₂ triggers an important signal inducing dPCD in stem cells. Given that plays roles in maintaining WUS expression and stem cell activity, we speculate that the dynamic shift from to H₂O₂ in the shoot apex results in stem cell death. Our findings provide novel insights for understanding ROS-mediated regulation during plant stem cell death.     

用三菱电机UPS+PLC实现SIL-4/Ⅰ级风险的嵌入式系统集成——广州新白云机场空管系统3oo1D×(2oo1D+2oo1D)D大功率UPS系统(Ⅲ)

本文通过1项已经安全运行7年的典型"功能安全措施"工程的系统设计,来说明IEC 61508-1998/2000和GB/T 20438.4-2006的初步实际运用.其功能安全措施比核电核岛的3oo1D要求更高的3oo1D×(2oo1D+2oo1D)D.     

从1998年抚河大水所想到的几个问题

１９９８年６月抚河出现超过有水文资料记载的历史最高水位，达３３．０８ｍ，洪峰流量为９８００ｍ３／ｓ，相当于１６年一遇（２０年一遇洪峰流量为１０５００ｍ３／ｓ），然而设计标准为抗５０年一遇洪水的抚西堤来说，却多次出现险情，由此感到必须从多方面着力综合整治，才能达到确保工程和人民生命财产安全之目的     

Content analysis of research in the Journal of Counseling Psychology (1973–1998).

A content analysis of the research published in the Joumal of Counseling Psychology (JCP) was conducted for a 26-year period (1973–1998). A total of 2,027 articles were classified into 14 substantive content categories. Frequency distributions were used to identify the most frequently published authors and institutional affiliations, as well as the gender and ethnic characteristics reported. The principal areas of research activity and publication in the JCP were process only, process and outcome, vocational behavior research, and the development and evaluation of tests and measures. These 4 categories accounted for 55.2% of the articles examined. Typical reported samples contained college students of both genders. This content analysis revealed that over this 26-year time span, the research reported in the JCP has remained consistent with the mission statement of the journal. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

1998年粉末冶金行业经济状况分析

汇总了中国机协粉末冶金专业协会３８ 家骨干企业的统计报表， 得出了行业主要经济指标表、企业经济效益综合指标表和各类产品占总产量分类比例汇总表， 并进行了分析。