数控机床智能化的主要技术特征

随着时代和科技的不断进步,数控机床技术的发展不断的优化和完善,整体的数控机床的发展趋势逐步向智能化发展。而对于数控机床的技术的开发和应用也逐渐的受到相关的机床生产商和采购者的重视。因而从实际上来讲数控的智能化发展不仅对机床所加工的产品的质量有一定的影响,对于加工的效率的影响也是比较大的。在此基础上,本文将对数控机床智能化的主要技术特征进行有效的分析和研究,从而使得数控机床技术能够更加健康的发展和进步。     

浅谈英语课堂的有效教学

提高课堂教学的有效性,精心设计生动的、富有情趣吸引力的、形式多样的活动。教学的有效性是教学设计的生命,是学校教学活动的一个基本追求,它直接关系到教学的质量和人才的培养。加强教师自身素质的提高是课堂教学的有效性的重要前提,教师本身的能力高低会直接的影响到课堂教学质量。     

马克思主义视域下人性的二重性解读

在人性的问题上,马克思主义之前的哲学往往用静止的、孤立的、片面的、抽象的、形而上学的思维方法来解读人性.马克思主义哲学以实践为出发点,运用辩证的思维方式,对人性作出了全新的二重性的解读,认为人性是全面的、发展的、辩证的,是矛盾的统一体,是能动与受动、客观与主观、具体与抽象、变与不变的统一,是一个系统的、开放的、复杂的有机整体.     

部分城市生产资料价格周报

一品名规格条件I北京沈阳天津武汉长沙上海成娜西安白银兰妞广州.曰,朴挂牌26000260的2580026500262的25,502石印02?加O25800,月1,f成交257的256加257002630025?的肠以力舫以冲2650025500自口几n几内内挂称‘168的168的1650016别沁168的1645017加01‘创沁16600下口J、U才、肠月J成文166的164001630016500163的164加17的016右的16200自几1什挂脚6,的72Q0690069的7(期】1即0飞95012的70的,口1,f成交68加‘900680068的69的,1506加069的69的山立,朴挂脚95的9500980097的匀55095509夕00肠阅95的,甲1心宁成交94的9300950096加匀5的95的躺0095的…     

电气自动化在钢铁企业中的应用策略

当代社会的科学技术是在不断的发展的,经济建设取得了巨大的成就,在这样的时代背景下对钢铁行业也提出了新的技术要求。这样其实在一定的程度上也推动了钢铁的快速发展。传统的电气工程的主要的组成部分是接触器和继电器等低压电气设备来进行实现的。随着科学技术的发展,传统的电气工程技术已经不能适应当今社会的技术要求。所以电气工程必须向着智能化、自动阿虎的方向发展,才能推动整个钢铁行业的自动化的改革。新型的综合化的创新型技术是需要结合智能化、自动化以及电气化等方面的控制手段这样才能在钢铁行业之中取得一个良好的钢铁运行结果,从而促进整个工业经济的全面发展。     

晶体取向和极图测定

在冶金学研究和工程材料这两方面都应用了测定晶体取向信息的技术。机械和物理性能的研究,形变、再结晶和晶粒生长的研究,固态转变的研究,腐蚀速率的研究以及扩散的研究都常常包含有晶体取向的测定。另一方面,板材的塑性形变或磁性的各向异性这两者都起因于微晶的择优取向,对这一点的认识是控制这些材料的性能的基础。根据在深冲时会导致额外的不必要的修整和切头损失的制耳行为,形变的各向异性是明显的。通常,对磁性的各向     

现代遥感技术在地质找矿中的应用

随着社会的不断进步以及经济的快速发展,我国的地质矿产业也得到了较快的发展,进而就在一定程度上对找矿的速率提出了更高的要求。而不断的将现代遥感技术应用在地质找矿的过程中,对于有效的提高找矿的效率以及准确度,以及不断的促进我国矿产业的发展都具有至关重要的作用。因此,我们应不断的分析与研究现代遥感技术在地质找矿中的应用,进而不断的改进与创新现代遥感技术,以此来有效的提高我国的找矿效率,进而不断的促进我国矿产业的稳定发展。     

冶金工程中机械设备的安装施工及维护探讨

随着西安代社会的快速发展,先进的科学技术的出现,改变了人们的生活方式,针对各个行业的发展情况,我们引进先进的技术和管理经验来更好的处理相关的工作,这样才能突破传统的建设,从而实现更好的发展.冶金工程中机械设备的安装施工和维护工作非常的重要,我们需要根据实际的发展情况来有效的解决其中各项问题,这样才能实现更好的发展.     

从两维视角探讨马克思主义关于人的本质理论

"人的本质是一切社会关系的总和",这是马克思对人的本质的科学论断.笔者认为人的本质是类本质和现实本质的统一.从人与社会的关系和人与自然的关系这两维视角审视人的本质,是符合马克思主义关于人的本质的理论观点的,这对进一步研究马克思主义人的本质理论及其把握有着重要的现实意义.     

《手稿》中马克思的人道主义体现

<1844年经济学-哲学手稿>是马克思在年轻时代总结自己的思想和弄清思考的问题而写的一个未完成的手稿.手稿中,通过谈及一系列的经济问题,更多通过社会现实揭示当时的工人的不平等无休止的劳动,即异化劳动.马克思通过对人的实践本质的论证,形成了一种关注人、尊重人、维护人的人道主义.在对异化劳动的激烈批判中,更显露了他的人道主义的批判性和变革性.又在人的实践本质之现实的工业活动表现中,揭示了人道主义的自然发生性,提出人道主义要和自然主义相结合,最终形成了他的现实的、革命的、实践的人道主义.本文重点对手稿中的人道主义观的体现做一个简述.     

内蒙古赤峰陈家杖子金矿床矿物学特征及成因

通过光片鉴定和电子探针分析,总结了内蒙古赤峰陈家杖子金矿床的矿石矿物组成,结构构造,划分了成矿期次.研究表明:矿床中矿石成分较复杂,硫化物种类多,有少量硫盐矿物出现;富硫贫砷毒砂、贫砷富硫黄铁矿、贫锌富铁的闪锌矿(与标准分子式相比),含杂质多的银锑黝铜矿和方铅矿与金关系密切;多金属硫化物阶段是该矿床的主要成矿阶段,其中第二世代富硫贫砷毒砂是陈家杖子金矿的最主要载金矿物,其次是方铅矿.结合流体包裹体测试和研究,确定该矿床为受大型角砾岩筒构造控制的低硫化型浅成低温热液矿床,该矿床深部有很大的找矿潜力.     

Lengthening contraction and interpretations of active state tension in the isometric twitch response of skeletal muscle

The plateau of tetanic tension in a lengthening contraction of muscle at any given length is always greater than that in an isometric contraction at the same given length. To account for this excess of tension, it is suggested that the contractile machinery is "locked" in a strained condition that might make the muscle capable of bearing a greater tension in a lengthening contraction than it can develop in an isometric contraction. It is proposed that this strained condition also occurs in a lengthening contraction of the twitch response. If this proposal is valid it seems certain that the plateu of tension in the lengthening contraction of the twitch response cannot be equated with the plateau of tension in the isometric contraction of tetanus. The design of the original concept, that the plateau of active state tension in the lengthening contraction of the twitch is equal to the plateau of tension (Po) in the isometric contraction of tetanus, is based upon the assumption that the contractile component is neither lengthening nor shortening during both of these plateaus. This assumption is made without considering the possibility that the plateau in the lengthening contraction might be due to concurrent lengthening of series elastic elements and shortening of the contractile component. To account for the plateau of tension observed after quick lengthening in the early phase of twitch contraction indirect evidence is presented favoring the view that the quick lengthening during stretch is followed by slow lengthening and stress relaxation (decrease of tension) in series elastic elements and simultaneous shortening and increase of tension in the contractile component. When the original concept of active state tension in the twitch response is interpreted in the light of lengthening contraction, it is concluded that the labeled or implied Po for the plateau of the active state tension is unwarranted and confusing. It seems that the primary source of confusion is the assumption that the tension a muscle is capable of bearing in a lengthening contraction is equatable with the tension it can develop in an isometric contraction.     

轧辊热凸度模型的修正算法

传统热凸度模型忽略了由轧辊轴向温差造成的径向剪应力的影响,而在接近带钢边部位置的轧辊相邻截面温差较大,此处热凸度计算曲线较实际曲线必然存在偏差。带钢轧制过程中存在跑偏现象,假设带钢偏离轧制中心线按正态分布,结合带钢跑偏对传统模型进行修正,使得在线仿真结果更接近于实际曲线。此模型方法简单,计算快捷,在板带轧机生产实践中具有重要的意义。     

广东那程银金矿床地质特征

那程银金多金属矿床位于广东省阳春地区。通过采用路线地质调查、构造填图、矿床（点）考察和岩石地球化学等方法,详细总结了矿区地质特征。震旦系云开群和寒武系八村群是区内主要含矿地层,但震旦系Ag元素丰度值明显偏高,因此震旦系形成的矿床规模比寒武系大;矿区整体为一背斜构造,北翼具有低温元素组合特点,南翼具有中温元素组合特点,反映出褶皱的南翼处于抬升,而褶皱的北翼处于下降,因此,北翼矿体的埋藏深度大于南翼;矿区燕山期侵入岩出露处一般都有较好的矿化,加里东期白云母-绢云母不等粒变质砂岩质条带状混合岩出露处矿化较好,而碎裂-糜棱岩化似斑状黑云母钾长石花岗岩出露处矿化一般。     

Isoprene: background and issues

Isoprene monomer is derived from petroleum cracking and is used in the manufacturing of polyisoprene, butyl rubber and a variety of copolymers. It is also the monomeric unit of naturally occurring terpenes (e.g. lycopenes, the pigmentation in tomatoes). Isoprene occurs in tobacco smoke and it is released by a wide range of plants and mammals (including man). Portion of the isoprene present in the atmosphere is therefore from natural origin. Isoprene is chemically closely related to butadiene. Both substances are being used in similar industrial processes and because of the structural analogy, it is often speculated that the toxicological properties of isoprene must resemble those of butadiene. In fact, the acute toxicity of isoprene is very similar and also the biotransformation to mono- and diepoxides is qualitatively alike. There is however a difference; isoprene is asymmetric and therefore more metabolic enantiomers are possible. Pharmacokinetic studies have demonstrated species differences (as with butadiene) in the maximum metabolic elimination rate: in mice this was determined to be at least three times higher than in rats which implies a species sensitivity in isoprene metabolism in the mouse. Both isoprene and its major metabolites were tested for mutagenic activity in Salmonella strains. Only the diepoxide was found to be positive in TA100. In in vivo cytogenetic tests in mice, no chromosomal aberrations were observed but an increase in SCEs and micronuclei was evident. As is the case with butadiene there are clear indications from long-term rat/mice inhalational studies with isoprene of a species difference in tumour response. Based on cytogenetic findings and tumorigenicity data it is clear that isoprene is less potent than butadiene. Such observations are important and useful to reduce uncertainties in risk-characterisation procedures (e.g. occupational exposure standard setting; EU existing chemicals regulations).     

黑龙江桦南二伐区金矿床地质特征与成因探讨

断裂构造主要有两组, 北西向断裂为基底构造继承和改造的产物。北西向断裂是本区主要的导岩、导矿构造, 浸染状金矿石为主要的矿石类型, 约占矿石总量的60%, 呈他形粒状、浸染构造, 金属矿物含量约占5% ~ 15%, 主要金属矿物为黄铁矿, 次为毒砂、方铅矿等。     

Metallography of telluride on free cutting steel

The results of investigation and analysis of telluride and sulfides in free cutting steel containing tellurium and sulfur can be summerized as follows. No tellurium is found in steel matrix. All the tellurium exists in solid solution in manganese sulfide. The extra amount of tellurium in excess of the solubility in manganese sulfide exists as MnTe in steel. The tellurium content in manganese sulfide is 2.5 wt% on average, and the sulfur content in MnTe is about 3 wt %. In annealed steel, the content of iron solutionized in MnS (steel containing 1–2 % Mn) and in MnTe are both about 2 wt %. MnTe usually forms complex inclusions with MnS. The greater the Te/S, the higher the MnTe content in the complex inclusions. There is no single phase MnTe in steel with Te/S as high as 0.84. When steel is hot worked, MnTe deforms more easily than MnS. MnTe appears light grey in a bright field, and opaque in a dark field. In cast steel it is anisotropic and in forged steel it is isotropic under polarized light. In cold drawn steel, most of the MnS is anisotropic and remained so after annealing at 1100°C. If Te/S in steel is too high, the MnTe formed is prone to stretch in the working direction during press work. Hence, in so far as controlling the shape of the sulfide with the aid of tellurium is concerned, a Te/S of about 0.1 is appropriate. When the MnTe and MnS in steel are separated electrolytely in the four different solutions used in this work, the equilibrium potential of MnS is relatively positive, and that of MnTe is relatively negative in comparison with iron. When an organic solution (No. 3) is used, the MnS in steel can be almost completely and MnTe partly separated.     

U3 snoRNA may recycle through different compartments of the nucleolus

A model is proposed in which U3 small nucleolar RNA (snoRNA) is recruited from an inactive, stored form in the dense fibrillar component (DFC) of the nucleolus to an active form that is associated with the initial ribosomal RNA (rRNA) precursor. The initial steps of rRNA processing occur in the DFC, and then it is proposed that the U3 snoRNA moves with intermediates in rRNA processing from the DFC to the granular component (GC) of the nucleolus. The nucleolar protein fibrillarin is located primarily in the DFC, and it is suggested that the complex of fibrillarin and U3 snoRNA dissociates when U3 snoRNA transits to the GC. Finally, when U3 snoRNA is released from the processed rRNA, the tether holding the rRNA in the nucleolus is broken and rRNA can then be exported from the nucleolus to the cytoplasm. U3 snoRNA is hypothesized to recycle back from the GC to the DFC where it is stored until future association with another initial rRNA precursor. Data supporting this model are summarized. U3 snoRNA is also stored in the coiled body of interphase cells and in the nucleolar remnants and prenucleolar bodies of mitotic cells, and there may be some similarity in the binding sites for stored U3 snoRNA in the DFC and in these structures.     

焙烧天车双联夹具的机构改进

焙烧天车是电解铝制造行业的主要生产设备,双联夹具是焙烧天车的主要作业工具,主要完成炭块的运输工作。本文详细叙述了双联夹具机构的工作原理,较透彻分析了炭块在夹持过程中的受力状况。同时针对生产中出现问题,对夹具机构进行了改进,并取得了一定的效果。