新城中村对城市空间绩效的影响研究——以义乌市宅基地安置的新城中村建设为例

宅基地安置模式下的新城中村建设,诱导村集体、村民,努力将其实现住房权益最大化,聚焦于对城中村改造建设用地规模与优势区位的争取,影响城市空间资源的高效配置。该文以宅基地地租为基础,通过定量计算、定性分析,建立新城中村影响城市空间绩效的模型,探析宅基地安置模式下被沉没的村民利益和城市效益,提出创新城中村改造模式的新理念和新方法：引导城中村改造主体,由对宅基地、住房等物质空间的过度关注,改为对宅基地、住房经济价值的追求,加快城村融合,提高城市空间绩效。     

喷射裂解法制备碳纳米笼和石墨烯片层及其作为铂催化剂载体的应用

采用喷射裂解法,以羰基铁为催化剂前驱体,吡啶为碳源,通过改变温度或比例(V(羰基铁)∶V(吡啶))制备了不同形貌的碳纳米材料。采用氯化铵热处理法去除碳材料中的铁催化剂,得到具有空心结构的碳纳米笼和石墨烯片层,采用高分辨透射电镜(HRTEM)对载体的形貌特征进行表征。然后将Pt纳米粒子沉积在碳载体上,得到不同的Pt/C催化剂。通过HRTEM、X射线衍射(XRD)和电化学测试对合成催化剂的结构、形貌和电化学性能进行了表征。实验结果表明:制备温度和反应物比例的变化导致产物的结构形貌发生变化;当作为催化剂载体时,其微观结构和石墨化程度对催化剂的催化活性和稳定性有很大的影响。     

城镇土地估价多媒体信息系统研究

随着我国土地使用制度改革的深入和地产市场的逐步培育、完善、土地估价以及地价信息的管理和利用显得越来越重要了。该文介绍了将城镇土地估价、地价信息管理与先进的计算机技术有机结合，研制开发多功能可视化城镇土地估价多媒体信息系统的设计思想和实现方法。该系统的使用将大大提高土地估价和地价信息管理的科学化和自动化水平。     

Design and development of an intelligent context-aware decision support system for real-time monitoring of container terminal operations

This paper describes a case study of the research and development of an intelligent context-aware decision support system (ICADSS) prototype for real-time monitoring of container terminal operations in Hong Kong. We present the system design and development of the prototype system, and discuss the experiences and lessons learned. To the best of our knowledge, this study is the first identifiable application of an intelligent context-aware decision support system for the real-time monitoring of container terminal operations reported in the academic literature. The intelligent context-aware decision support system employs ZigBee-based ubiquitous sensor network (USN) technology. In this study, an ICADSS prototype was built and implemented in a real world setting. The results of the system prototype evaluation are satisfactory and support the contention that it is more effective in supporting the real-time tracking and tracing of container trucks, quay cranes, and rubber-tired gantry cranes in a container terminal. The results also validate the practical viability of the proposed system architecture. Given the contextual details of the study, we present the lessons learned from developing and operating the system in a container terminal and provide suggestions for further research. We hope that the proposed system architecture and developed prototype system can help both practitioners and academics in the further use and research of intelligent context-aware decision support systems.     

一种新型双感应八侧向测井仪结构研究

文章阐述了一种新型双感应八侧向测井仪的结构设计及其技术难点.通过强度和稳定性校核确定了探头电子部件外壳及电子线路绝缘外壳的结构.通过分析传统方法的不足,确定了一种压力平衡补偿装置的新型结构.     

Estimation of intracellular phosphate content in plant cell cultures using an extended Kalman filter

Phosphate is an essential nutrient that is usually taken up by plant cells rapidly and stored intracellularly. Currently, there is no convenient means for on-line sensing of the intracellular phosphate content in cultured plant cells. In this study, a state estimator for this important parameter in batch plant cell cultures was developed using extended Kalman filter (EKF) methodology. A non-linear kinetic model was constructed to describe the dynamics of intracellular phosphate uptake and utilization. For intracellular phosphate estimation, this model was found to be most sensitive to three parameters: the maximum specific growth rate (mu(max)), the maximum phosphate uptake rate (nu(max)), and the yield coefficient on oxygen (y(o)). The EKF algorithm coupled with the kinetic model and on-line oxygen uptake rate (r(o)) measurement was used successfully to track the intracellular phosphate content under different initial phosphate concentrations. The state estimator could also accurately predict the biomass concentration. When mu(max), nu(max), and y(o) were included in the state vector, tracking of intracellular phosphate was only slightly affected. The estimation system was found very stable as long as the measurement errors of the initial states, the r(o) measurement error, and the system error were respectively within 30%, 30%, and 50%. With a r(o) measurement interval as long as 12 h, accurate tracking of the intracellular phosphate content could still be attained using a discrete EKF. Apparently, the slow r(o) dynamics in plant cell cultures allows the use of a long measurement interval. Considering the difficulties encountered in the on-line sensing of intracellular phosphate using the chemical or nuclear magnetic resonance (NMR) methods, the EKF method coupled with simple on-line oxygen uptake rate measurement provides a promising means for sensing this important culture parameter on-line.     

SFD505型双宫自动缫丝机工艺探索

分析SFD505型双宫自动缫丝机与双宫立缫机在工艺要求上的主要不同点;采用单因素试验方法,重点讨论缫丝汤温、小(竹或)转速、喷水量与双宫丝纤度值之间的关系,并求出回归方程式。     

Sensitive Determination of Bromate in Water Samples by Capillary Electrophoresis Coupled with Electromembrane Extraction

Electromembrane extraction (EME) as a novel sample preparation technique was firstly applied for the purification and enrichment of bromate (BrO₃ ^?) in drinking water prior to capillary zone electrophoresis with capacitively coupled contactless conductivity detection (CZE-C⁴D). BrO₃ ^?, as the primary disinfection by-product of ozonation, could be well separated with the major inorganic anions coexisting in water samples using a 300 mmol L^?1 acetic acid solution as the running buffer. Under the optimum conditions, the calibration curve showed good linearity (r ²?=?0.996), and the limit of detection was down to 0.12 ng mL^?1 with the enrichment factor at 267. The relative standard deviation (RSD) values for peak area and migration time at a spiked concentration of 10 ng mL^?1 of bromate were below 8.8 and 2.5 %, respectively. This proposed EME-CZE-C⁴D method has been successfully applied to analyze bottled drinking water and tap water samples with recoveries in the range of 85~98 %, providing an alternative to the determination of bromate in drinking water.