污水源热泵在某工程中的应用

空调冷热源的设计在空调系统中占有至关重要的地位。从某综合楼空调系统冷热源设备选型出发,描述了污水源及污水源热泵的特点,分析了污水源热泵在该工程中的应用,并提出了利用"污水源+板式换热器"替代冷却水塔提供冷却水的方法,从而为污水源热泵的选用和污水源的有效利用提供了理论依据。     

石家庄市PM_(2.5)工业源成分谱的建立及分析

石家庄大气污染严重,尤其是PM2.5浓度经常居高不下。为更加有效地降低PM2.5的浓度,需要对石家庄市PM2.5的来源进行精确解析。为了更加精确地进行源解析工作,需要以本地排放源的成分谱作为输入参数,目前关于石家庄市PM2.5工业源谱的研究还未见有文献报道。选取石家庄市具有代表性的若干工业,借助各种先进分析测试手段,深入细致地分析了石家庄市PM2.5的工业源谱,对于研究石家庄市PM2.5源解析具有很大的参考价值。研究发现:电力行业源谱中的Al可作为电力行业燃煤源标志性化学组分,且含量高于其他城市数据,是石家庄市电力行业源谱的显著特点;在钢铁行业源谱中,Fe和Ca的含量明显区别于电力行业源谱,可作为石家庄市钢铁行业源谱的标志性化学组分。     

Some Simple Economics of Open Source

There has been a recent surge of interest in open source software development, which involves developers at many different locations and organizations sharing code to develop and refine programs. To an economist, the behavior of individual programmers and commercial companies engaged in open source projects is initially startling. This paper makes a preliminary exploration of the economics of open source software. We highlight the extent to which labor economics, especially the literature on 'career concerns', and industrial organization theory can explain many of these projects' features. We conclude by listing interesting research questions related to open source software.     

引进型管理创新知识源分析——以广州本田环境绩效管理模式为例

根据我国企业实践,绝大多数管理创新属于引进型创新,即在组织外部已存在的管理实践或思想的基础上引进加工而成的创新。因此,有效获取管理创新知识,即知识源问题,成为我国企业引进和实施管理创新的关键。在总结管理创新相关研究的基础上,提出管理创新的三类主要知识源：内部知识源、市场知识源和专业知识源。研究发现：大部分企业以非当地企业为参照群体;咨询机构是我国企业管理创新的重要来源;政府政策导向作用明显;内部员工没有发挥应有的作用。在此基础上,对广州本田的环境绩效管理模式创新做案例分析,具体分析管理创新中知识源的作用。     

农村户用分体式地源热泵系统运行特性分析及应用——以邯郸地区某示范项目为例

为了解决京津冀地区农村冬季采暖存在的环境污染问题,以邯郸地区示范项目典型农宅为例,提出了一种新型的分体式地源热泵系统。首先,利用TRNSYS软件建立分体式地源热泵系统模型,模拟分析了系统的长期运行特性;再通过费用年值法和污染物排放量计算,对比分析该地区常见的4种采暖方式的经济性和环境效益;最后选出最合理的运行系统。结果表明：1）分体式地源热泵系统运行高效且稳定,运行期间系统COP达3.5以上,热泵机组COP达4.0以上;2）在间歇运行方式下,土壤平均温度一年的降幅为0.8%,十年的降幅为3.6%;3）在4种采暖方式综合对比下,分体式地源热泵系统运行费用较低且环保性较好。分体式地源热泵系统的运行性能研究为户用分体式地源热泵系统在京津冀地区典型农宅的应用推广提供了参考借鉴。     

降解胆固醇马红球菌F21-1的分离、鉴定及其特性研究

利用以胆固醇为唯一碳源的选择性培养基,从豚鹿粪便样品中分离出1株降解胆固醇良好的菌株。经生理生化鉴定和16S rDNA基因序列分析,该菌株为马红球菌(Rhodococcus equi)。该菌株降解胆固醇的最佳碳源为胆固醇,最佳氮源为蛋白胨、硝酸铵复合氮;最佳培养条件:温度为32℃,初始pH值为8.0,胆固醇质量浓度为1.50 g/L。在该培养条件下培养24 h,胆固醇的降解率可达到71.95%。     

On the open design of tangible goods

Open source software development has received considerable scholarly attention, much of which is based on the presumption that the 'open source model' holds some lessons of broader applicability. Nonetheless, our knowledge of its deployment outside the software industry is very limited. This paper focuses on the open source development of tangible objects, the so-called open design. We propose a generalised definition of open source development. Drawing on 27 exploratory interviews and six comparative case studies selected from a pool of more than 75 projects, we analyse the workings of open design. The analysis reveals that open design is already being implemented in a substantial variety of projects with different organisational and institutional structures.     

Referrals between professional service providers

An explanation is provided for referrals as the dominant source of information for buyers of professional services. Considering the importance of referrals as a source of information, several questions are raised regarding the criteria professionals use when making referrals. Finally, the results of a study are presented that provide answers to those questions.     

太阳能-土壤源热泵系统在唐山地区适用性研究

简述了太阳能-土壤源热泵系统的研究现状,介绍了太阳能-土壤源热泵系统形式,采用Dest软件对唐山地区的太阳能辐射量情况进行了分析,并对典型建筑的负荷特性进行了模拟分析,论述了太阳能-土壤源热泵系统在唐山地区的适用性。     

Enhancing mental models,analogical transfer,and performance in strategic decision making

Recent research suggests that managers often make strategic decisions in novel situations by utilizing past experiences to reason by analogy. However, there is substantial evidence that decision makers often fail to identify and apply knowledge about one situation to a similarly structured situation. Two experimental studies investigated the mechanisms impacting knowledge transfer from one managerial situation (the source) to an analogous situation. The results show that exposure to variation in the source situation improves transfer performance. Variation decreases performance in the short term but improves learning and increases analogical transfer. Higher performance on and systematic search of the source situation also increase transfer performance. These results yield important implications for enhancing analogical transfer in strategic decision making and for future research on reasoning by analogy. Copyright © 2012 John Wiley & Sons, Ltd.     

VFP8.0中自由报表的实现

介绍了VFP8.0环境下报表设计中动态数据源的组织方法及自由报表的多种实现方法,并结合实例给出了这些方法的具体实现代码,使用这些方法可以在不改变源程序的前提下,实现报表内容及格式的变更,使得报表设计更灵活、更方便。     

离子液体在大气污染控制中的应用研究

介绍了离子液体在大气污染控制中的应用,主要从大气污染源头控制和末端控制两方面展开了深入的论述。源头控制方面从燃料油脱硫、替代挥发性有机溶剂两方面进行了详细阐述。末端控制方面从离子液体脱除烟气中的SO2,H2S和去除VOC等方面进行了探讨。     

离子注射法选育利福霉素菌种与发酵条件优化

通过20 keV氮离子注入利福霉素生产菌筛选到1株产量比初发菌株提高20.41%的高产菌株,并命名为zrnm2164。8次传代实验表明,该菌株遗传稳定性较好。对其培养基的碳源、氮源及发酵温度等进行初步优化,最终确定玉米淀粉糖化液为碳源、蛋白粉为氮源,实验得出28℃为最佳工艺温度。     

一种基于余热回收的CO2污水源热泵系统设计与性能研究

CO2属于环境友好型制冷剂,其跨临界循环非常适用于热泵系统。通过对自然工质物性和CO2污水源热泵专用活塞压缩机不可逆损失的研究,构建了带节流阀和带膨胀机的2种单级CO2污水源热泵系统数学模型,开发了一套CO2单级热泵循环性能分析平台。该项目拟设计一种高效稳定的CO2污水源热泵系统,实现城市污水低温余热的回收再利用,既符合社会可持续发展的要求,同时也是节能减排的重要组成部分。     

Absorptive Capacity and Source‐Recipient Complementarity in Designing New Products: An Empirically Derived Framework*

Numerous publications are dedicated to absorptive capacity and new product development (NPD). Most are centered on the recipient team, and very few consider the effects of the source team knowledge characteristics on the knowledge absorption and the NPD performance. This paper analyzes the type of the external knowledge sourced from outside the organization and the process through which it is used by the recipient firm and the effect on NPD performance. This is done through a specific type of source team knowledge, the design, and through the NPD process in industries (clothing and construction) where it plays a key role. NPD cases were analyzed and clustered in three categories of design absorption processes. From these categories, a conceptual framework of the source‐recipient knowledge complementarity and its impact on the NPD performance is proposed. The main result is that the complementarity between the recipient and the source knowledge is a critical aspect of the absorption process and therefore of the NPD performance. From a managerial perspective, this research highlights the role of design in the NPD process and how the combination of design knowledge with prior knowledge (marketing or technological) is related to NPD performance.     

河北省土壤扬尘源PM2.5排放量估算

为了解河北省扬尘类细颗粒物污染的总体状况,以2015年为基准年,通过卫星遥感影像解译方法获取土壤扬尘活动水平数据,采用排放因子模型估算河北省土壤扬尘细颗粒物的排放量。卫星解译结果显示,河北省土壤扬尘源主要包括农田、荒地和裸露山体3类,其中土壤扬尘源总面积为77 627km2。计算结果表明土壤扬尘源的PM_(2.5)排放量为39 699t,其中农田扬尘33 866t,荒地扬尘1 567t,裸露山体扬尘4 266t。因此,农田是河北省土壤扬尘排放的主要来源,占总排放量的85.3%,重点排放区域分布在河北省南部的邯郸、邢台等地,以及西北部的张家口等地。研究结果可为河北省土壤扬尘污染策略的制订提供依据。     

乙酸钠碳源和铁盐除磷剂对活性污泥系统的影响

为进一步提高污水处理厂工艺运行调控技术水平,通过3套SBR小试处理系统,考察了乙酸钠碳源和铁盐除磷剂2种药剂对污水脱氮除磷效果和活性污泥性质的影响。结果表明：投加250 mg/L的乙酸钠碳源和70 mg/L的铁盐除磷剂均可显著提高除磷效果,均可实现出水总磷达到一级A排放标准,其中,投加铁盐除磷剂会削弱生物除磷效果,且随着铁盐除磷剂投加时间的延长,生物除磷效果下降程度增加,而投加乙酸钠碳源会明显增强生物除磷效果,并减轻除磷剂对生物除磷的抑制作用;投加乙酸钠碳源可明显提高反硝化效果,投加铁盐除磷剂反硝化效果略有提高,但不明显,2种药剂对硝化反应均无明显影响;投加乙酸钠碳源可使MLVSS/MLSS,SVI及SOUR值增加,而投加铁盐除磷剂使MLVSS/MLSS和SVI值降低,SOUR值增加。通过考察进一步掌握了2种药剂对污水处理厂活性污泥系统的影响,可为污水处理厂工艺调控提供科学实用的技术参考。