移动运营商手机游戏业务的战略定位和发展策略探讨

分析了韩国、日本及国内运营商手机游戏业务的发展状况．探讨了手机游戏业务的模式．论述了该业务的战略定位和市场前景。从地区提供给移动通信市场对外部环境、产业链的准备是否充分以及运营商内部的资源和运营状况等三个方面阐明了手机游戏业务发展的关键因素。     

节水灌溉实施办法探讨

从我国实际情况出发,探讨了节水灌溉及其技术体系的建立、节水模式的选择和相应的对策措施。     

试论循环水装置的经济性及其成本分析

通过对循环水装置的投资和成本分析，阐述了建设该装置的经济性和社会意义。     

加强安全监督管理 保障检修施工安全

通过严格外来施工队伍和人员的安全管理,加强直接作业票证的管理,落实监护人职责,开展项目危险性分析,强化现场监督等手段,从而加强了检修现场的安全管理,保证系统停车检修的圆满完成。     

SO2-4/ZrO2-SiO2的制备及其催化合成丁酸丁酯

采用分别沉淀/混合沉淀法、改性共沉淀法和以硅溶胶为硅源的共沉淀法制备了SO2-4/ZrO2-SiO2固体超强酸催化剂;考察了沉淀剂及沉淀终点的pH等制备条件对分别沉淀/混合沉淀法制备的SO2-4/ZrO2-SiO2催化剂催化合成丁酸丁酯活性的影响;探索了ZrO2-SiO2的制备方法、反应时间对SO2-4/ZrO2-SiO2催化剂活性的影响.实验结果表明,以硝酸铵为沉淀剂,当沉淀终点的pH为7～8时,采用分别沉淀/混合沉淀法制备的SO2-4/ZrO2-SiO2催化剂的活性较高(酯化率88.7%),但分别沉淀/混合沉淀法制备的ZrO2-SiO2组成不均匀;以硅溶胶为硅源采用共沉淀法制备的SO2-4/ZrO2-SiO2催化剂催化合成丁酸丁酯,在正丁醇0.48 mol、正丁酸0.40 mol、反应时间3 h、不添加任何带水剂的条件下,酯化率高达96.4%,该方法制备的催化剂稳定性和再生性能好,制备成本低.     

Estimating and reducing the memory requirements of signal processing codes for embedded systems

Most embedded systems have limited amount of memory. In contrast, the memory requirements of the digital signal processing (DSP) and video processing codes (in nested loops, in particular) running on embedded systems is significant. This paper addresses the problem of estimating and reducing the amount of memory needed for transfers of data in embedded systems. First, the problem of estimating the region associated with a statement or the set of elements referenced by a statement during the execution of nested loops is analyzed. For a fixed execution ordering, a quantitative analysis of the number of elements referenced is presented; exact expressions for uniformly generated references and a close upper and lower bound for nonuniformly generated references are derived. Second, in addition to presenting an algorithm that computes the total memory required, this paper also discusses the effect of transformations (that change the execution ordering) on the lifetimes of array variables, i.e., the time between the first and last accesses to a given array location. The term maximum window size is introduced, and quantitative expressions are derived to compute the maximum window size. A detailed analysis of the effect of unimodular transformations on data locality, including the calculation of the maximum window size, is presented.     

Bandpass filters with reconfigurable transmission zeros using varactor-tuned tapped stubs

In this letter, bandpass filters with one or two tunable transmission zeros are proposed. The reconfigurable transmission zeros are implemented through varactors in combination with tapped quarter-wavelength stubs. Based on mixed mode simulations including EM simulation and circuit simulation, the proposed filters were designed and fabricated on low-cost FR4 board. The measurement results verified the design concepts.     

燕皮传统加工工艺中碱液对肉糜特性的影响

燕皮是以猪肉和甘薯粉为原料,手工制成的薄如纸且经煮不烂的传统食品。在传统制作燕皮过程中添加山榉灰配制的碱液是影响肉糜品质的关键步骤。通过测定制作燕皮过程中各工序样品的氮溶解指数、持水性、乳化稳定性、pH值和粘度,利用SDS-PAGE分析样品中的蛋白质组分、利用光学显微镜观察它们的结构变化,证实植物碱液能够提高样品的氮溶解指数、持水性和乳化稳定性并且延迟了肉糜硬化。同时实验证明碳酸碱(Na2CO3或K2CO3)可替代传统工艺中的植物碱,为后续标准化、工业化生产提供可行条件。     

Ca掺杂钨镁酸铅陶瓷材料的制备及其介电性能

研究了Ca掺杂钨镁酸铅(PMW)陶瓷材料的合成、结构、烧结以及介电性能。结果发现：在Ca^2 摩尔分数小于15％时，能形成单相的PCMW钙铁矿相，结构由原来的斜方相向立方相转变。用二步合成法制备的样品容易致密烧结，气孔率比一步法制备的样品小。Ca的加入降低了材料的介电损耗，在频率为1MHz时，介质损耗达到了10^-4。当Ca^2 摩尔分数大于10％时，材料的Curie峰宽化显著，介电常数温度系数降低。     

黄海地质构造与油气资源

针对以往黄海油气勘探在找油思路、勘探深度、勘探领域、勘探部署和勘探技术等方面存在的问题 ,概述了南、北黄海地质构造、盆地演化、油气地质特征及成藏条件 ,并在此基础上 ,提出了对黄海油气资源远景的几点认识