内燃机试验台架智能专家系统

系统由内燃机试验台架的构建和内燃机故障诊断专家系统两部分组成．内燃机试验台架部分包括内燃机参数的采集和控制，如压力、温度、转速等，以及对这些参数的处理．内燃机故障诊断专家系统部分则是利用试验台架采集的数据进行实时智能故障诊断，并给出应采取的措施和方法．     

隔震换能控制系统的数据采集及控制

半主动控制具有能耗小,控制效果接近主动控制等优点,是目前国内外研究的热点、隔震换能控制系统具有隔震换能和主动控制双重功能,属半主动控制,由于该系统兼具主动控制的特点,因此其信号采集及控制力的实施是影响该系统性能的关键．试验结果表明,该数据采集系统具有信号误差小、工作效率高、性能稳定等优点,可以应用于半主动控制的数据采集和控制系统。     

城市水生态修复工程生态需水量分析

针对城市水生态修复工程中河道与塘库交错、季节需水存在差异等特点,对河道部分的需水提出了综合生态水力学法,将河道功能要求转化为水力约束条件,通过河道水力模拟得到生态流量;对塘库部分的需水流量,采用功能法计算．在此基础上,根据河道与塘库水力联系分析,综合确定水生态修复工程生态补水流量．本文以成都市九道堰水生态修复工程为例,分别计算得到河道与塘库不同季节生态需水量,确定了水生态修复工程生态补水流量．研究结果对于城市河流水生态修复工程补水量的确定,以及水生态保护具有重要参考价值．      

汽车驾驶机器人模糊车速跟踪控制方法

为了实现汽车驾驶机器人在各种工况下对给定车速的准确跟踪,提出了一种驾驶机器人模糊车速跟踪控制方法.驾驶机器人根据试验循环工况规定的目标车速和实时采集到的试验车辆车速解算出车速误差和车速误差变化率,经过模糊推理得到驾驶机器人油门、制动、离合器机械腿和换挡机械手的下压或回收运动差值,从而实现驾驶机器人的精确定位控制.试验结果表明,试验条件的变化对模糊车速跟踪控制的影响不大,该方法具有较强的抗干扰能力,能够准确跟踪给定的目标车速,跟踪精度满足要求.     

普通车床数控改造实例研究

本文简要叙述了普通机床数控化改造的意义和一般步骤;并举实例从总体方案设计、计算机数控系统选择、机械本体部分改造设计、机床控制部分设计、机床参数设置与调试、机床精度及机床性能与数控功能检验等六个方面详细阐述了普通机床数控改造的研究思路。     

提高称重系统中硬件及机械承载部分精度的研究

本文主要研究高精度称重系统中硬件及机械承载部分的精度。主要是从三个方面展开分析，即传感器，机械谐振和承载机构设计和安装与称量精度的关系进行研究．     

附着空化流动下离心泵水力性能数值预测

采用改进的空化模型和算法，同时耦合黏性Reynolds-Averaged Navier-Stokes方程求解技术，对空化流动条件下离心泵的水力性能进行了数值预测研究．采用具有试验数据的拱形头部圆柱体空化绕流考核了所提出的空化模型和算法的准确性和可靠性．采用数值方法研究了不同流量系数下离心泵水力性能与空化系数之间的关系，预测了空化系数对离心泵叶轮表面附着空化气泡形状的影响．数值结果表明，在相同的流量系数下，存在着临界空化系数，在临界空化系数时离心泵的水力性能突然下降，空化系数越小，离心泵叶轮表面的附着空化空腔越大，同时造成水力性能下降的越快．研究结果证明了所提出的空化模型和算法能够应用干水力流体机械宅化流动时的性能预测。     

兰州理工大学省级重点学科液压传动与控制省级重点学科简介

兰州理工大学液压传动与控制学科隶属于兰州理工大学流体动力与控制学院,其前身是1954年成立于哈尔滨工业大学动力系的水力机械专业,是我国创建最早的流体机械学科,当时水力机械专业分水轮机、水泵、液压传动三个专门化方向。1961年该学科迁至富拉尔基哈尔滨工业大学重型机械学     

活塞式空气压缩机性能测试系统设计

结合测试技术、交流变频技术、多传感器同步数据采集技术,设计了基于VC++6.0软件平台的活塞式空气压缩机性能计算机测控系统。阐述了该系统软、硬件设计原理和功能。该系统可对包括进气流量、冷却水流量、压力、温度和环境条件在内的26路空压机试验参数进行实时检测与分析,可实现变频、软启、直接驱动的交流电机控制和直流幅压直流电机控制,具备故障报警与记录、数据保存与打印、历史曲线绘制等功能。实际应用表明,系统采集、控制周期常规为30 ms,最快可达6ms,具有自动化程度高,可进行的试验项目多,性能参数测量精度高等特点。     

基于机器视觉的电缆方位检测系统

为了提高线缆一线生产企业的工作效率以及生产流水线的自动化程度,研究了基于机器视觉的电缆方位检测系统。该系统通过机器视觉模块实时采集电缆图像,通过图像处理和机械臂旋转来检测和矫正电缆的方位,以达到目标位置。检测与矫正的精度,将影响后续电缆配件及插头的安装精度。通过试验及现场测试得出该系统具有良好的实际操作性能。     

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.