于机器视觉的发动机厂视觉防错系统

在大批量工业生产过程中,用人工视觉检查产品质量效率低且精度不高,用机器视觉检测方法可以大大提高生产效率和生产的自动化程度.而且机器视觉易于实现信息集成,是实现计算机集成制造的基础技术.在中国,这种应用也在逐渐被认知,且带来最直接的反应就是国内对于机器视觉的需求将越来越多.本文就针对汽车行业发动机生产线上的工件、活塞等进行检测识别进行讨论,并且对机器视觉未来在中国国内的发展进行展望.     

橡胶挤出机检测与控制系统研究

针对国内橡胶挤出机自动化程度低、生产效率低的现状,选用热电偶温度传感器、超声波位移传感器和压力传感器,采用虚拟仪器、可编程控制器、工业以太网、计算机系统集成等技术构建了橡胶挤出机实时检测与控制系统.系统实现了挤出机橡胶挤出过程的温度控制、挤出量的测量与控制,同时实现了故障实时报警、生产数据自动生成、存储与报送功能.系统运行表明:橡胶挤出机的自动化程度和生产效率得到显著提高,运行可靠.     

组合无损检测技术在无缝钢管探伤中的应用

考虑到无缝钢管的生产特点,以及无缝钢管的自身特性,在无缝钢管生产过程中,无损检测技术是保证无缝钢管质量的重要手段。从目前无损检测技术在无缝钢管生产中的应用来看,单一的无损检测技术往往难以达到综合检测的目的,这就需要根据无损检测技术的特点,结合无缝钢管的生产过程,采用多种无损检测技术组合的方法,实现对无缝钢管的有效探伤。因此,我们应认真分析组合无损检测技术在无缝钢管探伤中的应用。     

探讨红外成像检测技术在变电设备运行中的运用

科学技术的发展可谓日新月日,在变电设备运行检测中,红外成像技术得以广泛应用,在设备运行动态评价方面,具有很大的优势,提高了变电检修的效率。在该文中,笔者从红外成像检测技术的应用现状,及提高红外成像技术在变电设备中运行有效性的措施等两个方面分析总结了该命题。变电设备在运行过程中,发生故障前,往往会释放出大量的热,通过红外成像检测,可检测到这些热,可避免由于故障而产生的停电、火灾等事故。     

简析智能电机保护器在电机保护中的应用

电机设备作为工农业生产中的重要动力设备,在生产过程中起到了主要生产作用,随着工农业生产需求增加,电机设备往往会在运行中出现缺相、过载、欠压等工作的情况,这在一定程度上对电机设备的使用寿命与生产效率产生影响.为了确保电机设备在生产中正常运转,生产企业会对电机设备做出相应保护措施.科技水平的不断进步,促使智能化技术得到了更...     

基于PXI总线的电子装备测试系统设计

PXI总线电子装备测试系统是将基于PXI总线的虚拟仪器技术,应用于航空电子装备的测试。针对航空电子装备的测试需求、系统开放性和可扩展的要求,设计研制了一套基于PXI总线的检测设备。详细说明了基于PXI总线的电子装备测试系统的硬件构成和软件设计方法。该系统以PXI内嵌主控计算机为核心,以LabVIEW软件为开发环境,并综合运用标准接口和总线技术来实现系统的综合设计。通过设计测试证明该系统方案切实、有效。     

镜像加工在数控刀具制造中的应用价值研究

数控刀具在制造过程中,往往因为细节的问题而面临非常复杂的情况,并且随着客户对产品要求越来越高,镜像加工技术逐渐被引进数控刀具生产过程中。镜像加工技术主要应用在数控铣削加工程序中,尤其是当遇到零件的轮廓是对称的或者是不对称的时候,都可以通过这一技术做到很好的外轮廓加工效果。与此同时,还能到达减少错误率,缩短加工程序的效果。而数控刀具往往就具有镜像的特点,因此将镜像加工技术引进数控刀具加工中对于提升生产效率而言,具有非常重要的意义。     

发酵过程中生物量浓度的在线估计

在发酵过程中,像生物量浓度等变量都是进行实验室的离线采样分析,这往往由于存在较大的时间延迟而不能及时地进行过程控制,达不到指导生产的目的.而软测量技术为该问题提出了一个很好的解决办法.基于神经网络与最小二乘支持向量机分别建立了生物量浓度的在线检测软测量模型.模型分为两类:黑箱模型与混合模型.模型的训练与验证数据都是取自真实的实验过程诺西肽发酵.结果表明软测量方法对生物量浓度具有很好的预估性能,而且加入先验知识的混合模型精度更高.     

基于PXI平台功率放大器的包络整形技术

包络跟踪功放与固定电源供电的功放系统不同的是,系统的性能不仅仅与射频输入信号有关,还与包络输入信号有关.将基于PXI平台的同步定时技术进行系统级分析,并讨论固定增益法等不同包络整形技术对于功放效率和线性度等系统性能指标的取舍.另外,还提出了一种新的针对电源调制模块的校准方法.     

基于CCD检测技术的LED产品生产智能检验

CCD检测技术在LED产品生产中应用广泛,本文系统分析和总结了在LED生产过程中数码管表面缺损和管脚环氧树脂不良产品的检测筛选应用,从检测原理、电路软硬件设计、效益分析等方面进行阐述和分析,充分说明在LED产品生产过程中应用CCD检测技术进行不良产品检测筛选的可行性、可靠性和良好的经济效益.     

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。     

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.     

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.