房建工程上部结构防渗漏施工的质量管理措施

当房建工程的上部结构出现渗漏时,建筑的主体结构就会被侵蚀,从而导致其使用寿命缩短。文章对房屋上部结构出现渗漏的原因进行了分析,并由此对其质量管理措施与注意要点进行了阐明与论述。     

冀西北水泉沟碱性岩体成因讨论

水泉沟碱性岩体是冀北著名的控矿碱性杂岩体,岩体由二长岩类、正长岩类及碱长正长岩类组成.各类岩石间无明显的界线,一般为渐变过渡关系.岩石化学组成总的特征是贫硅、富碱,铝含量中至高,反映了随着岩浆演化,碱质交代加强,岩体属于碱性—偏碱性岩体.通过对该岩体铅同位素、钕锶同位素图解研究,样品投点于地幔与大陆壳演化线之间,少量于陆壳演化线之上,说明铅、锶同位素不是单一来源,原始物质来源于地幔,推测岩浆自地幔上侵过程中有壳源物质加入.对比K-Ar法测年数据和39 Ar-40Ar法年龄测试结果,认为水泉沟碱性岩体形成于288～327.4 Ma,属海西晚期.     

硅酸镥闪烁体γ高剂量率脉冲线性响应上限测量

在“强光一号”高剂量率脉冲伽马装置上，使用李萨如图形法测量了硅酸镥闪烁体的γ高剂量率脉冲线性响应上限。实验结果表明：硅酸镥闪烁体在脉冲伽马能注量率小于1.9×10¹⁹MeV/(cm²•s)时，光输出为线性;大于此限值时，出现非线性响应现象。     

To What Extent Is Water Responsible for the Maintenance of the Life for Warm-Blooded Organisms?

In this work, attention is mainly focused on those properties of water which are essentially changed in the physiological temperature range of warm-blooded organisms. Studying in detail the half-width of the diffusion peak in the quasi-elastic incoherent neutron scattering, the behavior of the entropy and the kinematic shear viscosity, it is shown that the character of the translational and rotational thermal motions in water radically change near T_H ~ 315 K, which can be interpreted as the temperature of the smeared dynamic phase transition. These results for bulk pure water are completed by the analysis of the isothermic compressibility and the NMR-spectra for water-glycerol solutions. It was noted that the non-monotone temperature dependence of the isothermic compressibility (β_T) takes also place for the water-glycerol solutions until the concentration of glycerol does not exceed 30 mol%. At that, the minimum of β_T shifts at left when the concentration increases. All these facts give us some reasons to assume that the properties of the intracellular and extracellular fluids are close to ones for pure water. Namely therefore, we suppose that the upper temperature limit for the life of warm-blooded organisms [T_D = (315 ± 3) K] is tightly connected with the temperature of the dynamic phase transition in water. This supposition is equivalent to the assertion that the denaturation of proteins at T ≥ T_H is mainly provoked by the rebuilding of the H-bond network in the intracellular and extracellular fluids, which takes place at T ≥ T_H. A question why the heavy water cannot be a matrix for the intracellular and extracellular fluids is considered. The lower physiological pH limit for the life of warm-blooded organisms is discussed.     

Experimental investigation of discharge characteristics of a surface‐wave‐produced planar plasma

Experimental investigations of the discharge characteristics of planartype surfacewaveproduced plasmas (SWP) have been carried out. On this apparatus, the efficiency of microwave power absorption into the plasma depends strongly on the thickness of the dielectric window. Especially at a thickness of 12 mm, it has been found that more than 80% of microwave power is absorbed into the plasma. In order that the uniform power absorption is brought about effectively in a wide range of gas pressures, the dielectric waveguide that is placed above the dielectric window needs the air gap between them. These experimental results will enable us to improve the apparatus configuration to achieve better operational performances of surface wave plasmas. © 2001 Scripta Technica, Electr Eng Jpn, 138(3): 9–18, 2002     

Numerical simulation of temperature distribution in melt spinning of PET monofilament

Numerical simulation for calculating temperature distributions, including the axial and radial temperature gradients in the melt spinning of polyethylene terephthalate (PET) monofilament, was performed. The finite difference method was used to calculate the radial temperature distribution. Newtonian and the upper convected Maxwell models were adopted as a constitutive equation, respectively. There is little difference in the axial and radial temperature profiles between Newtonian and the upper convected Maxwell constitutive equations. The effect of spinning conditions on the temperature difference between the core and surface was investigated. Quench air velocity is the most effective process variable in controlling the temperature difference. Quench air velocity profiles were investigated to reduce the temperature difference between the core and surface. Lower quench air velocity profile at initial deformation zone leads to a decrease in temperature difference between the core and surface. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1045–1051, 2006     

关于欧几里得空间E~d中的二距离集

本文对欧几里得空间 Ed 中球面上二距离集的势给出了更好的上界估计     

二阶积分微分方程的周期边值问题

本文研究了二阶积分微分方程的周期边值问题,在反向上下解的条件下,利用Fredholm定理和比较原则得到其极解的存在性。     

绿水河水电站上坝坝体裂缝及位移事故处理

绿水河水电站首部枢纽上坝在施工过程中,因承受3倍以上的设计允许水位差,导致上坝坝体出现裂缝、位移的严重事故,事故后通过采取补强加固工程措施及控制运行工况,消除了事故隐患,保证了电站的安全运行。     

近十年气候变化对黄河中上游水沙影响分析

本文针对１９８６￣１９９５年黄河中上游平均年径流量为５０年代以来最小值，而入黄泥沙量去未出现相应减少的异常现象，着重分析了同期的气候背景，发现流域降水、气温、以及与其相关联的西太平洋副热带高压，青茂高原区与印缅槽区的高度场、台风活动等要素都出现了气候突变。自９０年代开始热带太平洋发生了百年罕见的持续性长ＥＮＳＯ现象，并连续发生了３次ＥＮＳＯ事件，均属百年罕见。正是由于诸因素的异常变化，从而导致黄河