运用有限状态图设计图书馆IVR系统

运用有限状态图设计图书馆语音自动应答系统, 以弥补图书馆现有系统的不足，实现以读者为中心的新型信息服务模式，使图书馆的信息服务在广度、深度、效率等方面都有较大的提高。     

钢纤维高强混凝土配制与施工工艺

根据高强混凝土的力学性能，提出在工程中采用钢纤维高强混凝土的优越性，对钢纤维高强混凝土的原材料选择、配合比设计以及拌合、浇注等关键问题作了详尽的探讨和归纳，并对具体实例分析了钢纤维高强混凝土的配合比对性能的影响。     

一类带有储藏费和交易费的商品期权定价模型

在Black—Scholes模型的基础上,利用证券组合技术和无套利原理推导出一类带有储藏费和交易费的商品期权定价模型,并借助于有限差分法给出了模型的数值解.最后,给出了一个求解该类商品期权的数值算例.     

ANSYS非线性有限元软件在桥梁结构分析中的应用

有限无法是分析复杂工程结构的一种非常有效的数值方法．本文通过叙述采用ANSYS进行钢箱梁结构分析的实施步骤，介绍了使用ANSYS非线性有限元软件进行桥梁结构分析的方法．     

二进数布尔代数的几个应用结果

本文讨论了二进数所成的布尔代数以及它与X幂集P(X)所成的布尔代数之间的同构关系，利用其解决关于子集的交集、并集的计数问题，关于交错k-子集的计数问题和关于交错R-子集的计数定理。     

Development of a plastic injection molding training system using Petri nets and virtual reality

INTRODUCTIONAt present, plastic as a substitute for metals in products is the most important mainstay in industrial raw materials. Furthermore, plastic injection molding is one of the most common and versatile methods for mass production of complex plastic parts with excel-lent dimensional tolerance. Since the technology of injection molding has been widely applied in manu-facturing, training on injection molding is of great importance. The traditional approach is to consult some technica…     

Adaptive terminal sliding mode control for high-order nonlinear dynamic systems

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Experimental performance of moderate and high temperature heat pump charged with refrigerant mixture BY-3

Theoretical and experimental analysis of a new refrigerant mixture BY-3 was conducted based on a single-stage vapor compression refrigeration system. The water-water heat pump system used BY-3 to produce hot water when the low temperature was 20 ℃. The following results were obtained: the highest temperature at the condenser outlet reached about 85 ℃; when the difference between the water temperatures at the condenser outlet and the evaporator inlet was less than 40 ℃, the coefficient of performance (COP) was larger than 4; when the difference reached 55 ℃, the COP still kept 3; the discharge temperature of BY-3 was lower than 100 ℃, and the refrigerant vapor pressure kept lower than 1.8 MPa. When the water temperature at the condenser outlet reached over 85 ℃, nearly a 5 ℃ superheating temperature was maintained.     

强酸-弱酸混合体系中准确滴定强酸的研究

为准确滴定出强酸-弱酸混合体系中所含强酸的量,需考虑在不同的准确度要求条件下,混合酸体系中弱酸的浓度范围要求。基于混合酸滴定过程终点误差的2个来源分析,提出了混合酸体系中终点误差(TE)计算的新方法。在指定的终点误差要求和强酸的浓度范围条件下,计算了HCl-HAc、HCl-六次甲基四胺盐两种混合酸体系中HAc、六次甲基四胺盐浓度范围要求,随着各酸碱指示剂变色点pH值的增大,两弱酸浓度的上限要求逐渐减小。在|TE|=1%条件下,当HAc、六次甲基四胺盐浓度分别低于1.18和0.135 mmol/dm3时,可采用任意酸性指示剂准确滴定0.1 mol/dm3浓度范围的HCl含量;而当两弱酸浓度分别低于10.6和10.5 mmol/dm3时,准确滴定出混合酸体系中1.0 mol/dm3的HCl含量亦可采用任意酸性指示剂。     

高速包装机椭圆齿轮的有限元分析

采用有限元分析方法对烟草包装机椭圆齿轮的静力学特性进行理论计算和研究,建立椭圆齿轮的有限元模型,通过有限元分析软件ANSYS Workbench对椭圆齿轮进行分析,得出椭圆齿轮各轮齿的应力分布,并对计算结果进行分析。该方法和所得结果为椭圆齿轮的优化设计提供了参考。