浅析移动增值业务的发展趋势

近年来移动增值业务以强劲的增长速度、快速的市场渗透力创造了巨大的经济效益。在我国,移动增值业务为运营商带来了显著的经济效益,成为拉动总业务收入的生力军。与此同时,一个基于移动通信的信息服务产业应运而生,形成了以基础电信运营商、服务提供商（SP）、内容提供商（CP）和各类应用开发商等共同组成的新兴产业。随着信息通信技术和互联网的快速发展,人们对移动增值业务的需求也逐步呈现综合化、多媒体化和个性化的发展趋势。在当前背景下,各种网络新技术的研究和应用的根本目的都是提升服务和业务能力,其关键就是实现业务的融合与统一。     

Adaptive HVAC zone modeling for sustainable buildings

Control of energy flows within a building is critical to achieving optimal performance of heating, ventilation and air-conditioning (HVAC) systems. To design optimal HVAC control strategies, a dynamic model of the HVAC system - particularly the building zones that it services - is essential. As analysis of building energy consumption is facilitated by the accurate prediction of indoor environmental conditions, techniques that dynamically model HVAC zones are crucial, and as such, is an active area of research. This paper focuses on real-time HVAC zone model fitting and prediction techniques based on physical principles, as well as the use of genetic algorithms for optimization. The proposed approach is validated by comparing real-time HVAC zone model fitting and prediction against the corresponding experimental measurements. In addition, comparison with prediction results using an algorithm based on feedback-delayed Kalman filters has demonstrated the superiority of the proposed approach in terms of prediction accuracy.     

Ordered structure and thermal property of acid-modified high-amylose rice starch

High-amylose cereal starch has a great benefit on human health. Acid modification is very helpful for application of high-amylose starch in food and non-food industries. In this study, the ordered structure of acid-modified high-amylose rice starch was investigated by GPC, HPAEC, ¹³C CP/MAS NMR and XRD. Acid preferentially degraded the amylose, then A chain and short B chain of amylopectin. Relative double helix content and crystallinity both initially increased sharply and then progressively with acid hydrolysis. The relative crystallinity of starches obtained from ¹³C CP/MAS NMR was higher than that from XRD. The onset gelatinisation temperature decreased, while the peak and conclusion temperatures increased with increasing hydrolysis time. The endothermic value initially increased and then decreased with acid hydrolysis. The swelling power decreased while solubility increased after acid hydrolysis. These results add to our understanding of the effect of acid hydrolysis on the high-amylose rice starch.     

FL凹陷复杂水系下高电阻率储层油气评价技术

介绍利用自然电位幅度差值△SP与视地层水电阻率Rwa交会图确定复杂地层水系下高电阻率地层的地层水电阻率的方法，并计算储层含油饱和度，判断油水地层。以实例证明该方法在FL凹陷的应用。     

带补燃余热流化床锅炉改纯低温余热发电

根据节能减排等形势的需要,浙江虎山集团对原来205000t/d水泥生产线的余热(带补燃)流化床锅炉电站实施了纯低温余热电站的改造。文章详细介绍了其两台锅炉、汽轮机组及相应的辅机设备的具体改造内容及改造过程中关键问题的处理;同时对改造后的纯低温余热发电系统工艺流程、技术参数、运行情况和影响因素也进行了相应介绍及分析探讨。     

On-chip silicon light source: from photonics to plasmonics

Practical silicon photonic interconnects become possible nowadays after the realization of the practical silicon light sources,where the hybrid integrations of Ⅲ-Ⅴ semiconductors and silicon by bonding...     

深水平井钻井技术探讨

通过对西部油田１０余口深水平井钻井工程技术攻关和现场应用试验，形成了包括优化工程设计、井眼轨迹控制、安全钻井和钻井液体系的一整套深水平井钻井工艺技术，并创造了多项水平井钻井的全国纪录。多数试验井经试油获１０００ｔ／ｄ以上的高产，取得了显著的社会经济效益。     

基于降维机理模型的储能电池安全充电在线控制技术

大倍率充电会引起储能电池负极析锂，进一步可能会诱发电池热失控并导致安全事故。而析锂副反应与电池负极电位直接相关，通过模型精确预测负极电位，传输至储能电池管理系统调整充电工况，可以有效抑制负极析锂。因此，本文提出一种基于降维机理SP2D(simplified pseudo two-dimensional, SP2D)模型的储能电池安全充电在线控制技术。首先，对P2D(pseudo two dimensional, P2D)模型中部分偏微分方程进行降维简化，建立SP2D模型。同时采用拆解测量、实验标定、算法拟合和文献参考等方法获取相应的模型参数。其次，使用不同倍率的端电压和负极电位实验数据对模型进行验证，验证结果表明模型在不同倍率恒流工况下精度较高。之后，基于SP2D模型结合比例控制器开展了电池无析锂安全充电的仿真工作，结果表明，电池经过1895s充电即达到截止电压4.3 V，且充电过程中负极电位均处于无析锂安全电位区间。最后，对仿真得到充电策略进行循环验证，结果表明提出的充电方法能够实现电池无析锂安全充电。     

低功耗升压型DC-DC转换器SP6644/6645及其应用

SP6644/6645是Spice公司生产的一种性价比极高的低功耗低压升压型DC -DC转换器。该器件可广泛应用于传呼机、遥控装置、定点设备、医疗监视器等低功耗便携式终端产品的电源系统中。文中介绍了SP6644/6645的一般结构、使用技巧及其性能特点 ,给出了SP6644/6645典型应用电路及外接元件的参数选择方法     

RS-485总线在电力数据采集系统中的应用

本本介绍了RS-485总线接口，并针对电力数据采集系统，选用合适的485接口芯片SP485R。然后，从硬件电路结构和软件实现两个方面，讨论了保证RS-485总线接口电路可靠运行时应注意的问题。