如何监控施工质量和施工安全

施工质量和工程建设的安全始终贯穿于工程建设的全过程,如何监控和保证质量及施工安全,是每个参与工程建设和管理人员的职责和义务;特别是工程监理人员更要加强重视,只有加强了施工现场管理和监控,才能有效的控制施工质量和预防事故的发生。     

浅谈住宅水暖工程渗漏原因和防治措施

论述了住宅水暖工程渗漏的原因和防治措施,对从事住宅施工安装和管理工作者提供了借鉴经验。     

烟碱含量的影响因素及其调控技术

针对近几年来烟草生产上一直存在的烟叶尤其是上部烟叶烟碱含量偏高，烟叶可用性降低的问题，通过分析品种，气候、土壤、海拔等生态因素以及氮、磷、钾等营养元素，移栽期、种植密度、打顶、留叶数、生长调节剂等栽培措施对烟碱含量的影响。提出了①培育烟碱含量适宜品种；②烟叶种植向生态适宜区转移；③适量施用氮磷肥、平衡施用微量元素；④合理确定移栽期、打顶密度和留叶数；⑤采用生长调节剂；⑥超临界CO2萃取降低烟碱；⑦微生物降解烟碱等降低烟碱，提高烟叶可用性的技术措施     

云南农产品加工业现状存在问题及对策

在深入分析云南省农产品加工业发展现状、存在问题的基础上,借鉴国内外农产品加工业先进地区的经验,提出了加快云南省农产品加工业发展的思路及对策建议。     

A NEW TESTABILITY MEASURE OF DIGITAL CIRCUITS

A new scoap-like testability measure SCTM(a signal conflict oriented testability meaure) is presented, which represents not only the difficulty to control and observe the value of a node,but also the probability to cause signal conflict in the process of test generation. A parallel calculation scheme is offered, which speeds up the calculation m/2 times. Here m is the word length of a computer.     

A Globally Convergent Algorithm for Nonlinear Programming

A new globally convergent algorithm was presented for a continuous differen-tiable nonlinear programming by defining a measure function deviating from the Kuhn-Tucker point. With this algorithm which can be used to get the optimum solution of the problem,the optimal lagrangian multiplier corresponding the optimal solution of the problem was also obtained. A new iterative algorithm for quadratic programming is obtained when applying the general algorithm to quadratic programming. Finally,a numerical example was given.     

水头可调薄壁堰式渠道流量智能测控系统优化试验研究

采用巴赞堰流公式计算流量的水头可调薄壁堰式渠道流量智能测控系统通过渠道流量量测与控制试验,验证了其精准的测流功能和智能控制技术的可行性。为进一步提高该测控系统运行的效率和稳定性,减少运行能耗,对矩形薄壁堰堰流公式进行水力试验研究,通过分析堰上水头和流量关系,拟合出矩形薄壁堰流量计算公式。通过向该拟合公式引入修正系数λ=0.848,将测控系统测得的堰上水头数据值代入该拟合公式求得的流量值与电磁流量计测得流量值的差值的平均值为-0.004L/s,标准差为0.119,线性相关系数R2=0.989 1。该拟合公式相对于巴赞堰流公式形式简单、参数较少、运算简便,同时也满足节水灌溉对精准测流的要求,更适用于水头可调薄壁堰式渠道流量智能测控系统,对于在灌区推广和使用该测控系统具有重要的意义。     

Analysis of a site x year experiment with timothy polycross progeny

Summary Results from a cooperative breeding programme with timothy for the northern areas of Scandinavia are presented. The main aim of the programme was to identify genotypes for synthetic populations that are high yielding, adapted over the whole area and stable over years. A polycross comprising 12 genotypes from each of five sites within the region was formed. The subsequent 60 half-sib families and four reference varieties were then compared under sward conditions at the same sites. The trials lasted for three years and results for total dry matter yields are presented.Significant differences in yield between lines were found. There were also significant two and three factor interactions between lines, sites and years. A new two-step procedure is presented to select the genotypes to make up a synthetic variety. Firstly, a superiority measure (Q-value) is used to select a group of genotypes that are high yielding and stable over sites and years. Secondly, the GxE part of the Q-value is split into two terms. One measures adaptation to predictable environmental conditions. The other one measures stability to unpredictable changes in the environment. A plot of these two measures provides a tool for discarding unstable or poorly adapted genotypes. The statistical properties of the selection parameters are discussed.     

甲醛的快速检测方法之研究

针对危害食品安全与生活环境的甲醛测定方法进行了详尽研究 ,提出了在不同产品中检测甲醛含量的快速、高效、合理的几种方法。