非电量电测技术讲座：第十讲 用微波探测高炉料位

实现非接触、准确而可靠地连续测量高炉料位,对稳定高炉操怍,提高冶炼效率,降低焦比,以获取更好的经济效益极为重要。目前国内高炉仍沿用传统的机械接触式软探尺,由于接触式测量,在高温冶炼的环境下不可避免地会产生探尺被烧断、或受热延伸重锤埋入料内而测不准等缺点而难以适应高炉炼铁日益现代化的要求。从而迫使人们去探索先进的测量手段,以     

担载液相催化剂的研究——Ⅴ. 担载液相催化剂的EXAFS表征

本文利用EXAFS(Extended X-ray Absorption Fine Structure)对铑基担载液相催化剂(Supported Liquid Phase Catalyst SLPC)进行了结构表征。采用球面波理论对SLPC的EXAFS结果进行了多参数拟合。结果表明,在新鲜催化剂上,铑络合物以二聚物形式存在,推测其结构为(PPh_3)_2(CO)Rh-Rah(CO)(PPh_3)_2,Rh-C-O偏离共线分布。在经过羰化反应活化的活性SLPC上,铑络合物为单核的HRh(CO)_2(PPh_3)或Rh(CO)_2(PPh_32)_3。文中还讨论了SLPC的XRD谱。     

广义Chebyshev最优滤波器设计

本文论证了等波纹广义Chebyshev函数滤波器的最优化特性，提出了由设计指标得到广义Chebyshev函数的方法，并且引入信号流图非常简便的得到了对应网络的拓扑结构，最终完成滤波器的设计．本文对具有带外传输零点的滤波器设计具有相当重要的意义．     

模糊聚类分析在农业机械化投资行为研究中的应用

农业机械化投资行为因地区因素的不同而具有一定的区域性，为了研究相似地区的投资行为，在宏观上加以指导，本文采用模糊聚类的基本原理，定量分析研究了区域差异因素对农业机械化投资行为的影响．     

数字系统的高层综合

从高层综合的概念出发，分析了高层综合的各个任务以及彼此之间的依赖关系，对于高层综合中最重要的两个优化过程－时序调度和资源分配，全面归纳了已经开发的各种算法，力图深刻地揭示了各种算法的内在本质，最后，探讨了与高层综合相关的一些领域和问题。     

一个带参数的分式不等式及其应用

本文试给出一个新颖的涉及正数a，b，c，x，y，z带参数t的分式不等式，并举例说明其应用．     

High throughput N-modular redundancy for error correction design of memristive stateful logic

Memristive stateful logic is one of the most promising candidates to implement an in-memory computing system that computes within the storage unit. It can eliminate the costs for the data movement in the traditional von Neumann system. However, the instability in the memristors is inevitable due to the limitation of the current fabrication technology, which incurs a great challenge for the reliability of the memristive stateful logic. In this paper, the implication of device instability on the reliability of the logic event is simulated. The mathematical relationship between logic reliability and redundancy has been deduced. By combining the mathematical relationship with the vector-matrix multiplication in a memristive crossbar array, the logic error correction scheme with high throughput has been proposed. Moreover, a universal design paradigm has been put forward for complex logic. And the circuit schematic and the flow of the scheme have been raised. Finally, a 1-bit full adder (FA) based on the NOR logic and NOT logic is simulated and the mathematical evaluation is performed. It demonstrates the scheme can improve the reliability of the logic significantly. And compared with other four error corrections, the scheme which can be suitable for all kinds of R-R logics and V-R logics has the best universality and throughput. Compared with the other two approaches which also need additional complementary metal-oxide semiconductor (CMOS) circuits, it needs fewer transistors and cycles for the error correction.     

电感耦合等离子体原子发射光谱法测定陶瓷色釉料中稀土元素

为了防止稀土的低附加值滥用,控制陶瓷色釉料中的稀土含量尤为重要,本方法为制订出入境检验检疫行业标准《陶瓷色釉料中稀土总量的测定电感耦合等离子体原子发射光谱法》提供可靠依据。由于陶瓷色釉料极其稳定的化学性质,因此不能采用传统的消解方法进行样品前处理,本文提出了用改进后的氢氧化钠和过氧化钠体系高温碱熔陶瓷色釉料,再用电感耦合等离子体原子发射光谱仪测定La,Ce,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y 15种稀土元素总量的方法。在陶瓷色釉料的消解方法、待测元素波长的选择和基体干扰校正方面进行重点研究。选取具有代表性的陶瓷色釉料样品进行回收率、精密度及重现性试验,测得方法的回收率在94.7%~102.7%,精密度小于2.7%,重现性小于4.3%。计算了15种稀土元素的检出限均小于0.51 mg·kg-1。     

局部载荷作用简支板屈曲分析

根据能量原理,引入大挠度Von-Karman方程,求解了应力不连续简支板的屈曲问题,得到了临界载荷和临界应力计算系数.     

The Perturbation Parameter in the Problem of Large Deflection of Clamped Circular Plates

In the problems of large deflection of clamped circular plates under uniformly distributed loads,various perturbation parameters relating to load,deflection,slope of deflection,membrane force,etc.are studied.For a general perturbation parameter,the variational principle is used for the solution of such a problem.The applicable range of these perturbation parameters are studied in detail.In the case of uniformly loaded plate,perturbation parameter relating to central deflection seems to be the best among all others.The method of determination of perturbation solution by means of variational principle can be used to treat a variety of problems,including the large deflection problems under combine loads.