An improved thermometer for intermediate-mass fragments

An improved thermometer (TIB) is proposed for intermediate-mass fragments via the difference between isobaric yield ratios. The residual free energy of three isobars is replaced by that of the binding energy. The measured fragments in the 140A MeV 40, 48Ca+ 9Be (181Ta) and 58, 64Ni+ 9Be (181Ta) reactions are analyzed to obtain TIB ranging from 0.6 to 3.5 MeV. TIB is suggested to be a direct determination of temperature avoiding the fit-ting procedure.     

基于MC方法的n-γ混合场复合屏蔽研究

利用MCNP程序,研究了n-γ混合场的自身特性及屏蔽层的排列方式对复合屏蔽的影响。结果表明,混合场中中子与γ的能量与注量比,以及屏蔽体结构,对复合屏蔽的效果有较大影响;在屏蔽体设计过程中予以充分的考虑,有利于屏蔽体的小型化与轻型化。     

Adaptive detection with conic rejection to suppress deceptive jamming for frequency diverse MIMO radar

With traditional radar systems, it is not easy to classify and suppress the intended false targets, especially in case of the mainlobe deceptive jamming. In this paper, the deceptive jamming suppression issue is formulated as a problem of detecting the presence of target signal while rejecting potential deceptive jamming under the multiple-input multiple-output (MIMO) radar with frequency diverse array (FDA) as the transmit array. The problem at hand is settled by resorting to the generalized likelihood ratio test (GLRT); at the design stage we define the sets where the false target and true target lie in. Since FDA-MIMO radar provides controllable degrees of freedom in both range and angle domains, the sets are range–angle related. This implies that both range and angle properties can be used to suppress the false targets. Based on the detector, a two-pulse scheme is proposed to guarantee high rejection probability of deceptive jamming. At the analysis stage, the performance of the detector is assessed in comparison with the conventional MIMO scenario and other detectors. The performance assessment shows that the proposed solutions are effective in the presence of electronic countermeasure (ECM) systems, especially when facing mainlobe deceptive jamming.     

砂率对混凝土主要性能的影响分析

在参阅国内外文献的基础上,结合混凝土配合比设计过程中的一点经验,论述了砂率对混凝土主要性能的影响,提出了确定合理砂率的原则。     

提高磷酸二铵产品中氮含量方法的探讨

介绍了采用添加硫酸、氯化铵，适当提高管式反应器中氨的质量流量和磷酸（体积流量）的比值，适当提高二次氨化量的方法提高磷酸二铵中的氮含量。     

对PKPM剪重比计算中动位移比例因子的探讨

本文通过PKPM的实际算例,并结合抗震规范(2010版)5.2.5条的条文说明,阐述动位移比例因子的不同取值对结构剪重比调整的影响。     

提高高校图书馆新书利用率措施的探讨

在分析图书馆新书利用率不高原因的基础上,从改变新书管理模式,做好新书推介服务,有效采购,通过采取新书流通、新书信息推介和推送、有效采购,加强学生信息素养教育,提升员工业务能力,科研建设等方面探讨了提高新书利用率的方法和措施。     

谈冬季施工混凝土配合比设计

对冬季施工混凝土配合比试配进行计算与分析，并对该过程中遇到的水泥、水灰比的选择、外加剂、养护条件和出料温度等问题进行思考，以确保冬季施工混凝土有足够的抗冻性。     

变压器匝间短路的在线监测技术研究、发展与展望

通过对变压器匝间短路原理及其检测方法的研究,结合多年的工作实践对在线监测匝间短路的方法进行了进一步分析和研究,并对其发展和展望做出自己见解.     

基于规范挠度公式的挠度控制的梁高确定方法

提出了通过合理配筋率与跨高比曲线关系来确定混凝土梁高的方法,解决了结构工程师在结构方案阶段无法较准确确定梁高的问题,使用GB 50010-2010混凝土结构设计规范中给出的考虑荷载长期作用影响的刚度计算公式,使得该方法理论依据更加合理,更加贴合实际工程,克服了根据经验值确定梁高的不足之处。