Pc控制器对全封闭多机头冷水机组控制的探讨

采用PC代替传统继电器—时间继电器控制全封闭多机头冷水机组，通过实验，编制满足控制要求的程序。实现多机头冷水机组的自动控制，使空调负荷与冷水机组产冷量相匹配。     

用PLC对提升机控制系统的改进

针对国产矿井提升机控制系统采用继电器存在的接线复杂、事故点多、准确性差、维修困难等问题，提出用PLC控制矿井提升机，并具体介绍用PLC代替继电器控制的硬件和软件方法。     

SR-21型可编程控制器在压滤机集中控制系统的应用

针对压滤机采用中间继电器控制问题较多的情况，采用了可编程控制器对压滤机进行控制，变原有的单台控制为集中控制，大大提高了换向装置的工作可靠性。     

基于西门子PLC的加热炉燃烧控制系统的设计

传统的加热炉电气控制系统普遍采用继电器控制技术，由于采用固定接线的硬件实现逻辑控制，使控制系统的体积增大，耗电多，效率不高且易出故障，不能保证正常的工业生产。随着计算机控制技术的发展，传统继电器控制技术必然被基于计算机技术而产生的PLC控制技术所取代。而PLC本身优异的性能使基于PLC控制的温度控制系统变得经济、高效、稳定且维护方便，这种温度控制系统对改造传统的继电器控制系统有普遍性意义。本文题材来源于2010年第四届西门子杯控制技能仿真挑战赛赛题，其中对工艺过程和控制算法进行了较为详细的阐述。     

PC在胀管机制中的应用

在分析胀管机传统的继电器控制系统缺点的基础上，论述了ＰＣ在 胀管机中的应用及控制程序的编制。结果表明，采用先进的ＰＣ控制取 代传统的继电器控制，使胀管机的可靠性及先进性等大为提高。PC在胀管机制中的应用@田秀华 @李新春     

某系统中FPGA控制行程继电器上电故障分析

某型导引系统中,用行程继电器实现对位标器框架的锁定,采用FPGA实现对行程继电器的控制。在系统上电时,出现行程继电器非正常动作。通过分析试验现象和故障机理,提出了故障解决方法并通过了试验验证。该方法在继电器控制、电机控制方面,对上电瞬间异常工作故障分析方面具有较高的参考意义。     

固态继电器在水舱气阀控制中的应用

介绍了固态继电器的组成、特点和分类，及其在减摇水舱模型性能试验气阀控制中的应用，试验表明，固态继电器能够满足水舱气阀控制的要求。     

教室灯光智能控制系统

教室灯光智能控制系统利用单片机作为核心部件，人体检测采用主动式红外扫描技术，功率接口采用固态继电器，电路和程序调整灵活，可实现照明系统的定时控制、环境亮度控制、人体红外检测和手动控制等功能，使灯光只在需要的时间和地点才点亮，达到节约能源的目的。     

无机膜分离除尘器自动控制系统设计

描述了新研制的无机膜除尘器的工作原理和控制要求，针对该除尘器的特点，为了克服以前采用接触器、继电器控制的缺点，采用可编程控制器重新设计了控制系统，经过实践证明，该系统克服了以前的控制系统的控制不准确、电磁阀误动作、易损坏流量计、控制工艺参数设定不方便等缺点，取得了较好的控制效果。     

用PLC对提升机控制系统的改进

针对国产矿井提升机控制系统采用继电器存在的接线复杂、事故点多、准确性差、维修困难等问题,提出用PLC控制矿井提升机,并具体介绍用PLC代替继电器控制的硬件和软件方法。     

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.     

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.     

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.     

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.     

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.     

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.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.