太阳能光伏发电的设计应用

传统能源的使用导致国际能源危机及环境污染的问题日渐严重,光伏太阳能作为一种新型能源,备受许多国家和地区关注。如何在建筑产业合理利用太阳能光伏发电,对光伏产业的发展具有重要的意义。文章结合多年来国内外太阳能光伏发电的应用推广情况,参考相关国家、行业标准及技术文献,结合广西美术馆项目的实际情况,分析光伏发电的技术特点,对如何进行太阳能光伏发电的设计选行介绍,并总结了目前光伏太阳能发电的优缺点及未来发展趋势。     

No-Arbitrage ROM simulation

Ledermann et al. (2011) propose random orthogonal matrix (ROM) simulation for generating multivariate samples matching means and covariances exactly. Its computational efficiency compared to standard Monte Carlo methods makes it an interesting alternative. In this paper we enhance this method׳s attractiveness by focusing on applications in finance. Many financial applications require simulated asset returns to be free of arbitrage opportunities. We analytically derive no-arbitrage bounds for expected excess returns to be used in the context of ROM simulation, and we establish the theoretical relation between the number of states (i.e., the sample size) and the size of (no-)arbitrage regions. Based on these results, we present a No-Arbitrage ROM simulation algorithm, which generates arbitrage-free random samples by purposefully rotating a simplex. Hence, the proposed algorithm completely avoids any need for checking samples for arbitrage. Compared to the alternative of (potentially frequent) re-sampling followed by arbitrage checks, it is considerably more efficient. As a by-product, we provide interesting geometrical insights into affine transformations associated with the No-Arbitrage ROM simulation algorithm.     

Impacts of diaspora travel on ethnic identity development among 1.5 generation Korean-American college students

This research project was designed to explore the impacts of the most recent trip to Korea on ethnic identity development among 1.5 generation Korean-American college students. The study employed 18 in-depth semi-structured interviews with Korean-American college students at a major university in the Midwest, USA. The data collection was conducted between December 2010 and February 2011. The findings of the study revealed that Korean-American college students exhibited different levels of ethnic identity prior to their most recent trip to Korea and described themselves as either Koreans, Korean-Americans, or Americans. Travel to Korea played important roles in (re)developing their ethnic identity. Those who identified themselves as Korean prior to the trip either confirmed their ethnic identity or changed their identity to Korean-American. Those who considered themselves Korean-American retained their ethnic identity, while those who thought of themselves as American altered their identity to Korean as a result of the travel.     

微波消解原子荧光光度法测定粮谷中的硒

采用微波消解样品,氢化物-原子荧光光度法测定粮谷中的硒。对消解温度、压力、时间、消解试剂以及仪器参数等条件进行了研究,取得了优化条件．硒的回收率达到96．4％-108．3％,溶液中的检出限为0．20μg／L,线性范围为1．00μg／L～100．00μg／L,相对标准偏差为3．30％-3．65％。本方法具有快速、简便、线性范围宽、污染少等特点。     

微气泡及其在环境污染控制中的应用

微气泡直径小于50 μm,具有区别于传统气泡的行为特性,在环境污染治理领域中表现出一些潜在的应用优势,日益受到关注.介绍了不同微气泡产生方法及其原理,比较了不同方法所产生微气泡的差异及其主要应用领域,分析了表面活性剂在微气泡产生过程中的重要作用.同时,讨论了微气泡在强化传质、界面性质等方面区别于传统气泡的行为特性,以及...     

怀旧消费决策模型及其营销启示

怀旧是人的天性,是人们感时伤怀的一种情绪。消费者怀旧消费决策主要包括产生于转化两个环节。消费者怀旧情感从纵向视角来看分为两个层次:怀旧倾向与怀旧强度,对应两大产生机制:内化机制与唤起机制。怀旧情感通过品牌信任、品牌依恋和品牌承诺的中介,从而转化怀旧购买。这种怀旧情感的产生-转化模型可以为企业开展怀旧营销提供思路。     

论农村未成年人思想道德教育中的问题与对策

未成年人的思想道德教育工作,是一项至关重要的战略工程,与每个家庭都密切相关。做好未成年人的思想道德工作是全社会的共同责任,但在当前社会经济飞速发展的同时,未成年人思想道德教育却状况频出,从其中存在的问题出发,或可找到症结所在,进而提出相应的解决措施。     

A forecast simulation analysis of the next‐generation DVD market based on consumer preference data

Just as standards wars over formats had characterized VCRs upon introduction to the market, the next‐generation DVD standards war between Blu‐Ray and HD‐DVD lasted 6 years before Blu‐Ray won the contest. Beginning with stated preference data drawn from a structured conjoint survey conducted before Blu‐Ray became the de facto standard of the next‐generation DVD format, we estimate consumer preferences on digital video players. A Bayesian mixed‐logit model is used and market share simulations are conducted under various scenarios based on the estimated parameters from Bayesian mixed‐logit model to surmise the future South Korean digital video‐player market. Results indicate that consumers feel that network size and title availability are more important than hardware‐related facets of the product, such as definition and storage capacity. The level of title availability and price of the Blu‐Ray player for Blu‐Ray's dominance over DVD will dramatically vary by the penetration rate of DVD players.     

基于“北斗一代”的Zigbee无线网关设计

为了解决野外多点数据采集无供电、布线复杂和通信困难的问题,提出了一种基于“北 斗一代”的Zigbee无线网关设计方案。采用MSP430F6438、CC2341微处理器和一体化的RDSS “北斗”射频芯片完成低功耗、小成本的硬件设计。通过增加SIM卡的数量,将网关转发“ 北斗”数据的频率降至最低的5 s,提高了网关的通信速率。通过软件设计实现了Zigbee无 线传感网络和“北斗一代”系统之间数据的透明交换。该方法已成功应用于野外油气井远程 监控系统中。     

新型城镇化背景下郑州市新生代农民工城市定居意愿影响因素研究

[目的]当前,推进新型城镇化建设已经成为国家健康快速发展的紧要问题。李克强总理在2015年全国人大会议上作政府工作报告时提出"以人为本的新型城镇化",强调城镇化建设中人的核心地位,在人的因素中新生代农民工是推进新型城镇化的最重要力量,他们的居留意愿成为决定新型城镇化的现在与未来成败的关键因素。因此,研究新生代农民工城市定居的意愿特征以及影响因素就具有很强的现实意义。[方法]通过调查问卷和实地访谈的形式对郑州市新生代农民工进行调研,在以第一手资料为基础的提前下,运用随机森林模型,从个人因素、家庭因素、制度因素和社会文化等4个方面中的24个因素实证分析影响郑州市新生代农民工留城意愿的特征和因素。[结果]影响新生代农民工留城意愿最显著的要素依次是从事职业类型、在城市工作时间、个人收入、家庭收入因素、是否参加城镇养老保险和是否享受城镇住房公积金。[结论]文章有针对性地提出发展教育、增加家庭收入和改善社会福利等解决问题的措施。