无臭氧负离子空气净化器最佳设计问题

研究了在电晕线加热情况下负离子空气净化器结构的选择总是其中包括电极间距、电晕线线径，网状电极网孔尺寸。讨论了加热功率及供电电源的设计问题，为负离子空气净化器的合理化设计提供了依据。     

微分差分方程（t）＝f（x（t—1））的周期解

讨论了当ｆ（ｘ）仅在有限区间给出定义时，微分差分方程（ｔ）＝ｆ（ｘ（ｔ－１））周期解的存在性和简单周期解的个数．由于采用了定性分析和构造法相结合的新方法，所得结果改进和拓展了前人的工作．     

广西煤的稀土元素分布模式

广西不同产地、不同时代、不同煤种的煤灰稀土元素分析结果表明，未变质煤的球粒陨石标准化图呈右倾斜“Ｖ”型曲线，北美页岩标准化图呈近水平直线，煤中稀土元素没有发生分离和迁移。区域变质煤的球粒陨石标准化图呈右倾斜的“Ｖ”型曲线，煤中稀土元素受后期热水溶液影响发生轻微迁移，向富重稀土方向演化。热液变质煤中稀土元素发生了强烈的分离和迁移；煤变质程度越高，时代越早，煤中稀土元素的分离和迁移就越强烈。     

管线钢X65热轧变形抗力数学模型

利用热加工模拟试验机进行高温单道次、多道次压缩试验，测定了管线钢Ｘ６５在不同条件下的变形抗力。在此基础上，建立了Ｘ６５钢的高温变形抗力模型和残余应变率模型，并对残余应变现象及其影响因素和算法进行了探讨。     

异步时序逻辑电路的最小时钟覆盖设计法

通过引入动态，静态迁移符号，提出了设计异步时序逻辑电路的新方法──最小时钟覆盖法，并举例说明了其应用．     

Growth ages of ferromanganese crusts from the western and central Pacific： Comparison between nannofossil analysis and ^10Be dating

Based on results of nannofossil analysis and 10Be dating in ferromanganese crusts M1-1 and A1-1 (no nannofossils were found in it),from the western and central Pacific respectively,it is found that the crust growth ages from nannofossil biostrati-graphy agree well with those based on 10Be isotope analysis. Both crusts have three growth layers,and the oldest layer was deposited in Miocene at about 12.80 Ma. The maximum,minimum,and average growth rates of crust A1-1 (from the central Pacific) are 8.11,1.92 and 3.47 mm/Ma,and those of crust M1-1 (from the western Pacific) are 2.93,0.47,and 0.94 mm/Ma.     

Climate change and hydrologic process response in the Tarim River Basin over the past 50 years

Climate change and hydrologic process response in the Tarim River Basin over the past 50 years are the focus of more and more researchers＇ attention. In this paper, both temperature and precipitation time series were found to present a monotonic increasing trend using nonparametric tests. Noticeably, a significant step change in both temperature and precipitation time series occurred in 1986. By contrasting the trends of natural water process in headstream and mainstream, we found that it was anthropogenic activities not climate change that caused the river dried up and vegetation degenerated in the lower reaches of Tarim River. The results of gray correlation analysis show that the runoff of higher latitude distributing river is more closely associated with winter snow stocking, while that of lower latitude is more closely related to summer temperature. Runoff in the headstream is more sensitive to precipitation, while that in the mainstream is more sensitive to evaporation. The strong evaporation caused by increasing temperature weakened runoff to some extent in spite of the fact that precipitation increased over the past 50 years.     

工作流网WRI WF-net的验证方法研究及实现

WF-net是一种工作流模型,合理性是衡量WF-net模型正确性的一个标准,不合理的工作流模型会导致运行错误.但是合理性验证问题是NP-complete问题,妨碍了WF-net的广泛应用.工作流模型WRI WF-net是WF-net的子集,能够直接保证工作流模型的合理性,这样只需确保用户建立的工作流模型符合WRI WF-net的约束,而不需要进行合理性验证.提出一个WRI WF-net的验证方法,能够在结构上验证模型是否满足WRI WF-net的约束,并且阐述了方法的实现.     

预应力混凝土平面曲线箱梁裂缝

针对预应力混凝土曲线箱梁,产生径向水平压力的平面曲线力筋易使混凝土腹板超载,而造成混凝土破坏,并使力筋拉直等问题,应用翘曲扭转理论,分析了预应力混凝土平面曲线箱梁在张拉平面曲线形纵向力筋时,将在腹板中产生横向力,以及桥墩和桥梁支座约束作用,局部板中力筋的径向力使竖向跨越的腹板产生剪力和弯矩等产生裂缝的原因,提出了在设计与施工中应采取保证力筋的保护层厚度,充分调整力筋曲率的作用,设计计算必须考虑侧向预应力,保证在力筋弯曲的部位、管道不出现尖弯等措施。为平面曲线桥梁的设计与施工提供了一定的理论依据。     

略论赣方言的形成

方言是语言分化的产物，语言分化的条件主要是移民运动，赣方言是宋代以前几次北方移民迁徒赣地区的产物，赣方言的语青系统在唐五代时期已基本定型。