APPLICATIONS OF INTEGRATED SEMIGROUPS TO HIGHER ORDER ABSTRACT CAUCHY PROBLEMS

This paper is concerned with applications of integrated semigroups tothe following Cauchy problem:(ACP_n) x~(n)(t)=sum from i=0 to n-1 B_ix~(i)(t),x~(i)(0)=x_i,0(?)i(?)n-1where B_i (0(?)i(?)n-1) are closed linear operators on a Banach space X.Auniqueness theorem,a condition of the solvability,a condition of the exponentialwell-posedness,and some results for the special case that B_(n-1) is bounded andD(B_(n-2))(?)D(B_i)(0(?)i(?)n-3) are obtained.     

镁基大块非晶玻璃转变的动力学性质

用真空吹铸法制备了直径2 mm的Mg65Cu25Y6Gd4与Mg65Cu25Gd10块体非晶合金棒,采用X射线衍射分析(XRD)、差热分析(DTA)分别对非晶合金的结构和形成能力进行了研究.以Mg65Cu25Y6Gd4与Mg65Cu25Gd10大块非晶合金DTA实验为基础,利用Kissinger方程对其玻璃转变的动力学性质从不同方面进行了研究.分析结果表明:玻璃转变表观激活能与频率因子v0越小,玻璃转变处Lasocka关系的B值越大,则对于同一合金系表现出玻璃形成能力(GFA)越强,这一现象是由于大块非晶合金独特的结构特点所引起的.     

室内装修与阻燃PVC穿线管

在进行室内装饰装修时,对电气线路进行穿管保护已经是广大用户所熟知的一个装修内容。除了动力线路和照明线路外,许多用户已要求将包括网络线、电话线、报警线路等所有强、弱电线路都进行穿管保护,阻燃PVC穿线管正在扮演着一个越来越重要的角色。但究竟应该选用哪种型号的穿线管才是既安全又经济的呢?阻燃PVC穿线管的质量如何鉴别,安装时应注意哪些问题呢?     

秸秆堆垛式氨化操作技术规程

秸秆堆垛式氨化就是把农民打碾后堆垛的农作物秸秆，不经任何处理，就地氨化的一种新式氨化法，它不用氨化池，具有省时、省力、经济、实用等特点，是畜牧科技人员近年研究摸索出的一种新型氨化方法，是在缺乏劳动力和铡草机具的养殖户中氨化饲草的一种行之有效的简易方法。     

THE M/M/c QUEUE WITH PH SYNCHRONOUS VACATIONS

1.IntroductionRecently,singleserverqueueswithvacationshavebeenstudiedextensivelyfromtheirowntheoreticalinterestaswellastheirapplicationstomanyengineeringsystemssuchascomputers,communicationnetworksandmanufacturingsystems.FOrtheM/G/lqueueingsystemswit...     

地震灾区过渡安置房和帐篷雷击火灾形势及对策

本文针对汶川“5.12“特大地震造成上万建筑物坍塌,数万灾民无家可归,灾后重建中临时安置点的过渡安置房和帐篷大多未采取防雷措施,加之目前已进入雷雨多发季节,雷电及因雷电引发火灾的防御形势十分严峻的情况,提出采取积极有效防范措施,确保临时安置点的防雷安全的对策。     

Component and simulation of the 4,000-year-old noodles excavated from the archaeological site of Lajia in Qinghai,China

Noodles are a global food, but the periods when and places where they were made and originated, as well as their ingredients and the cooking methods used to manu- facture them, have remained contentious. In the 2005 edi- tion of the journal Nature, we wrote a summary of the millet noodle specimens found in the Late Neolithic Qijia cultural stratum of the Lajia archaeological site in Qinghai Province, China. However, how the ancient people made millet noodles remains controversial. This paper provides a systematic analysis of the remains of noodles found within an earthenware bowl at the Lajia ＂noodle house＂ in terms of their plant composition including phytoliths, starch and biomarkers. It provides evidence of how people used millet 4,000 years ago and, most specifically, of the principal methods used for producing millet-based noodles. Further, we show how we used traditional hele tools to make hele millet noodles, with especial reference to the gelatinized hydrogel-forming method, to simulate morphology con- sistent with the composition and form of the unearthed millet noodles. The results of this study provide new evi- dence and new insights into the cultural characteristics of the prehistoric human diet.     

Mitigation of greenhouse gases released from mining activities: A review

Climate changes that occur as a result of global warming caused by increasing amounts of greenhouse gases(GHGs)released into the atmosphere are an alarming issue.Controlling greenhouse gas emissions is critically important for the current and future status of mining activities.The mining industry is one of the significant contributors of greenhouse gases.In essence,anthropogenic greenhouse gases are emitted directly during the actual mining and indirectly released by the energy-intensive activities associated with mining equipment,ore transport,and the processing industry.Therefore,we reviewed both direct and indirect GHG emissions to analyze how mining contributes to climate change.In addition,we showed how climate change impacts mineral production.This assessment was performed using a GHG inventory model for the gases released from mines undergoing different product life cycles.We also elucidate the key issues and various research outcomes to demonstrate how the mining industry and policymakers can mitigate GHG emission from the mining sector.The review concludes with an overview of GHG release reduction and mitigation strategies.     

直流测量误差的智能化修正方法研究

本文建立了处理系统误差的数学模型,提出了用软件处理误差的智能修正方法,并通过实验证明了这种方法的正确性。与传统方法相比较,本方法可减少硬件结构的复杂性和降低系统对元、器件特性指标的要求,并且可获得良好的误差实时修正效果。此外,这一方法对于被测信息作缓慢变化的测试系统都适用。     

方差分析的电算程序

本文介绍了两套Ｃ语言程序“ＤＹＳＦＣ－１１”和“ＳＹＳＦＣ－２１”，分别用于方差分析中单因素和双因素无重复试验数据的计算，本程序能迅速准确地得到统计值Ｆ或ＦＡ、ＦＢ。不仅可在教学中使用，也可直接用于科研，生产管理。