基于电容传感器的低露点湿度仪研制

该文在介绍氧化铝电容式传感器测量露点原理的基础上，详细论述了低露点湿度测量的几个重要问题：温度与压力补偿、传感器的稳定性及校正方法和系统测量问题，最后给出了温度修正经验公式．测试表明，该湿度仪精度高、性能稳定．     

单片机在非线性补偿中的应用

流量积算仪是用来接收流量传感器信号的二次仪表由于气体介质温度、压力的影响,在测量时需根据当时所测得的温度、压力值进行修正,以保证流量测量的准确性本文讨论温度压力补偿的硬件电路,特别着重分析用单片机进行非线性补偿的特点及查表法和折线法的综合应用     

单片机在非线性补偿中的应用

流量积算仪是用来接收流量传感器信号的二次仪表,由于气体介质温度,压力的影响,在测量时需根据当时所测得的温度,压力值进行修正,以保证流量测量的准确性。本文讨论温度压力补偿的硬件电路,特别着重分析用单片机进行非线性补偿的特点及查表法和折线法的综合应用。     

流量测量中温度、压力补偿数学模型的建立

在流量测量中，为精确测量流量应进行温度、压力补偿修正，本文重点介绍应用计算机建立温度、压力补偿数学模型。     

超临界供热机组滑压优化试验研究

目前超临界供热机组的滑压曲线多由纯凝工况的滑压曲线修正得到,一方面不能满足机组经济性需求,同时给运行操作带来不便。文中通过对超临界机组滑压运行特点分析,对某超临界供热机组进行滑压试验,选取纯凝、供热两种工况,考虑背压、供热流量两个变量对滑压曲线的影响,进行了多组试验,试验结果表明:1)定功率滑压优化时,相同电功率时,纯凝工况与供热工况的最佳主汽压力点存在较大偏差; 2)以主蒸汽流量为自变量设计滑压曲线时,最佳主汽压力与主蒸汽流量接近线性关系,说明以主蒸汽流量为自变量的滑压曲线能够较好适应背压和供热流量的变化。3)定主蒸汽流量设计滑压曲线,供热工况时部分负荷可降低机组热耗率约17kJ/kW·h。     

机械泵两相冷却系统过热现象的实验研究

机械泵驱动两相冷却系统是一种以机械泵为驱动力的封闭式相变传热设备。在对该系统进行研究过程中发现,当启动蒸发器热负荷时,在蒸发段出口将产生明显的过热现象,并且有较大的压力脉。通过对大量实验对与过热度有关的启动温度、流量和启动热负荷进行比较分析,得出启动温度越低,产生的过热度越大的结论:启动温度越低,启动需要的过热度相对要大;其次,热流密度越大,过热时间维持的越短;最后,从过热状态到两相状态的闪蒸过程将系统的阻力发生较大变化,流量越大压力脉冲越高。     

氧气流量测量的自动补偿

在化肥厂渣油制氨过程中气化炉以纯氧和过热蒸汽为气化剂的渣油燃烧生成水煤气氧气流量波动直接影响气化炉内的温度从而影响水煤气的质量因此氧气流量控制指标较高氧气流量测量采用标准节流装置此方法在保证设计参数的情况下测量精度较高但偏离设计值时将带来较大误差因此需要对氧气流量进行压力温度补偿氧气流量的控制采用SLPC 可编程控制器其内部有丰富的运算功能可实现氧气流量的自动补偿1 自动补偿的运算公式及规格化工作状态下氧气的体积流量Q 1 和用差压变送器测得节流装置的差压p 之间关系如下Q 1 = k P1g 1式中 k 流量系数节流装…     

基于超声波的污水流量测量系统的设计

针对工业污水流量的测量问题,提出一个基于超声波的污水流量测量系统。通过对污水流量的测量原理的分析,设计出了基于超声波的流量测量系统。该测量系统结构简单,测量精确度高,功耗低,适应性强,能在恶劣环境中工作,而且温度对系统造成的误差通过温度补偿技术减小了。     

地源热泵系统参数测量与误差补偿方法研究

针对现有地源热泵系统的监测数据不准确的问题,提出了一种针对地源热泵系统供回水温度和流量测量的误差补偿方法。首先搭建了一套地源热泵监测系统,实时获取地源侧、热泵机组和用户侧的供、回水温度和流量等数据,然后分析了影响温度和流量测量精度的主要因素,最后对温度传感器的零点漂移和温度系数进行标定,并对超声波传输速度和管道流体速度误差进行补偿。实验结果表明,该方法能够准确获得地源热泵系统运行参数,温度误差不超过0.2℃,流量误差不超过1.3%,可以为地源热泵系统远程监测提供数据支撑和经验储备。     

一起机组极热态启动时恶性运行工况引起停炉的事故分析

燃煤发电机组启动非常复杂,对过程中出现的相关问题需进行深入研究、总结规律。该文结合一起锅炉极热态启动过程形成的恶性运行工况,对主蒸汽压力和主再热蒸汽温度不匹配的问题展开分析,提出减小锅炉蒸发量和提高汽温的一系列方法和措施,为锅炉事故处理提供调整原则。以期能够对同类型锅炉出现问题的解决也有指导借鉴作用。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to