非水解溶胶-凝胶法低温合成硅酸锆

以工业纯ZrCl4、 Si(OC2H5)4为前驱体,通过非水解溶胶-凝胶法合成了硅酸锆.采用DTA-TG和XRD等测试手段研究了凝胶热处理过程中的物相变化.结果表明:当前驱体溶胶中未引入矿化剂时,硅酸锆的合成温度高达1450℃;相比之下,溶胶中引入矿化剂LiF后在600℃下便开始出现了ZrSiO4衍射峰,在700℃合成的硅酸锆不仅合成率高,而且晶体发育好,实现了低温合成硅酸锆的目标.     

轧制生产线是提高硬合金板带产量和成材率的关键

对硬合金冷轧板带材的生产现状与市场前景进行了分析；结合生产实际，阐述了造成硬合金冷轧板带产量小、成材率低的原因；提出了提高其产量和成材率的措施。     

论企业战略创新

阐述了推动行业结构变革和企业战略创新的主要因素;接着指出企业战略创新的正确行为方式是:在资源配置时,视颠覆性创新为威胁,在创建新的商业模式时,则把它当作一个机会;最后提出了应对行业结构变革,推动企业战略创新的5项具体策略。     

浅谈会计准则与会计制度

介绍了会计准则与会计制度的联系 ,分析了二者的差别 ,认为会计准则取代会计制度是可能的 ,也是必然的。     

Composite group vector space method for estimating melting and boiling point of pure organic compound

Composition Group Vector Space (CGVS) method for estimating melting and boiling point T _m , T _b of organic compound has been proposed, and the principle of this method has been elucidated. The models for estimating T _m , T _b have been established and the numerical values of relative parameters have been presented. The average percentage deviations of T _m , T _b estimation are 7.53 and 1.58, respectively, which show that the present method demonstrates significant improvement in applicability to predict the above properties, compared to conventional group methods.     

导数火焰原子吸收法对调味品中锌的测定

将微量脉冲进样技术和导数火焰原子吸收法结合，建立了测定调味品中锌含量的新方法。该方法的检出限为0．013μg／mL，精密度4．46％，回收率96．67～113．33。     

ANALYSIS OF SEEPAGE FLOW IN A CONFINED AQUIFER WITH A STANDING COLUMN WELL

The standing column well for ground source heat pump systems is a promising technology with high efficiency and environmental benefit, where groundwater is drawn from the bottom of a well and then re-injected to its top after transferring heat with heat pumps. Heat transfer analysis of great significance and aquifer involves complex problems. Determining the groundwater seepage flow is a precondition to solve the energy equation describing the heat transfer of the system. Only when piezometric head is obtained, the seepage velocity can be determined according to Darcy’s law. In this article the groundwater seepage flow in an axial symmetrical geometry was studied under the assumption that gross groundwater flow is neglected. An analytical solution of the groundwater seepage flow for a confined aquifer was acquired by using the integral transform method, which may provide a foundation for heat transfer analysis of the standing column well system.     

水电站厂内经济运行对象模型研究

通过对水电站厂内经济运行过程的数学模型和求解方法的深入分析，提出了水电站经济厂内运行的对象模型，按照对象化设计的思路，把相关特征数据和约束条件封装成对象的成员属性，把模型求解方法封装成对象的成员方法，各对象模型既可单独计算实现独自功能，也可通过各对象成员接口，共同实现复杂功能，提高了代码的重用性、可扩展性和可靠性。图1幅，表4个。     

长输管道腐蚀与防护设计浅析

以天津石化公司长输管道防护设计为例 ,介绍了滨海地区埋地管道的强腐蚀特性。通过对管道腐蚀机理的分析和防护方法的比较 ,确定了上述地区长输管道腐蚀防护设计的要点。     

干涉式光纤陀螺系统Serrodyne调制误差分析

本文首先针对实现闭环光纤陀螺系统相位零化技术的Ｓｅｒｒｏｄｙｎｅ调制理论进行了详细分析，通过对实际Ｓｅｒｒｏｄｙｎｅ调制分析得出因回扫时间的延迟产生周期性反对称毛刺是导致调制失真的因素，运用 Ｆｏｕｒｉｅｒ Ａｎｇｉｅｒ Ｂｅｓｓｅｌ级数对误差信号各次谐波分解得出低次谐波分量在误差信号中占主导作用，并提出减小调制误差的方法。