新型采集凝固热热泵技术及系统综合供热性能分析

针对寒冷地区冬季地表水水温过低和干渠污水水流量不足等水源状况,提出了新型采集凝固热热泵技术,即在高峰热负荷下采集水源的凝固热为建筑物供热.为有效地提取凝固热,在介绍专用设备凝固换热器原理的基础上,初步分析了热泵系统的重要参数及综合性能指标.对4个典型城市的应用分析表明,采集凝固热热泵系统供热季节性能系数在4.05～4....     

我国寒冷地区城市污水生物处理工艺的研究与应用现状

对在我国寒冷地区城市污水处理厂中取得较好应用效果的污水生物处理工艺进行了阐述,并分析了低温对污水生物处理工艺的影响,对寒冷地区城市污水处理厂污水生物处理工艺的进一步研究应用提出几点建议。     

水源热泵系统在中原地区的应用探讨

本文以河南省郑州地区为对象,介绍了利用城市中水的水源热泵在一个污水处理厂综合楼的应用.探讨了水源热泵在这一地区的应用潜力,提出了合理利用水资源的看法.     

寒冷地区采暖季某办公楼水源热泵系统运行能效综合分析

目的研究寒冷地区水源热泵系统的实际应用效果,分析影响系统运行能效的主要参数及参数影响因素.方法测量了寒冷地区采暖季某办公楼水源热泵系统运行的介质温度、流量和耗电量等基础参数,并通过计算获取了供、取热量和能效比等间接参数.分析了热泵系统的实际运行情况,确定了影响系统能效比的主要参数.通过相关性分析识别出主要参数的核心影响因素.结果水源热泵系统能效比(EER)平均在1.8左右;机组能效比(COP)平均在3.6左右.系统部分运行阶段取热能力不足;水泵能耗偏高,耗电输热比偏大.热泵机组COP与水泵耗电输热比是影响系统能效的主要参数.主机负荷率与用户侧温差是主要参数的核心影响因素.结论办公楼水源热泵系统运行稳定,提高机组COP与降低水泵耗电输热比是提升系统能效的关键.     

水源热泵空调在江西地区运用的可行性分析

文章分析了江西地区气候特点、水资源状况以及水源热泵系统对水源系统的要求,以江西省新余县某宾馆地下水源热泵空调系统为例,对水源热泵系统在江西地区的应用进行了实例分析。在江西地区应用水源热泵空调方式效率高、节能环保,符合当今世界可持续发展的要求。     

余热回收的污水源热泵系统

城市污水具有流量和平均温差波动不大特点。冬季污水管道内平均温度高于外界环境温度,夏季污水管道内平均温度低于外界环境温度。基于上述特点,设计了用于污水余热回收的热泵-污水耦合系统。考虑到臭氧层破坏 ODP和温室效应GWP,分别开发了带节流阀和带膨胀机的环保制冷剂 R744、R134a 和 R1234yf的污水源热泵系统平台并进行了性能分析。为实现中低温余热回收进而提高热泵性能提供资料。     

加热原油的太阳能-污水源热泵系统的开发

分析了油田用热现状和含油污水利用现状,详述了太阳能热泵在国内外的发展现状.在此基础上,提出应用太阳能-污水源热泵系统回收含油污水余热来加热原油,进而分析了该系统的组成及五种运行模式,建立了系统的数学模型,为太阳能-污水源热泵系统的应用提供参考.     

污水源热泵热能经济技术分析

污水源热泵是一种以城市或工业污水作为热源/热汇的空调系统.文章介绍了污水源热泵的工作原理和性能特点,利用财务净现值法和动态费用年值法对污水源热泵和风源热泵系统进行了经济技术对比分析;结果表明,采用污水源热泵可以大幅降低固定资产投资,减少能源和水资源消耗,具有较大的经济和社会效益.     

新型污水源热泵空调的实验研究

污水源热泵空调技术节能减排效果显著,是各类热泵技术中发展和应用前景最好的技术.文章提出了一种新型污水源热泵,通过利用蓄能器装置在夜间用电低谷时进行蓄能,在热泵机组正常运行的用电高峰期对污水进行预处理,有效的缓解用电高峰期负荷过高的情况.通过对有蓄能器与无蓄能器的污水源热泵进行实验对比分析,验证了新型污水源热泵的优越性.     

热泵热水系统在我国东北地区应用的经济性分析

采用年度费用分析方法,对热泵热水系统与其他热水系统相比较,研究热泵热水系统在我国东北地区的经济效益.旨在为热泵热水系统的实际应用提供一些依据.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-