高炉经济燃料比之我见

对最近有关高炉经济燃料比的论点提出了不同意见.认为按经济燃料比的理论,许多钢铁厂要提高高炉燃料比,而在我国目前条件下,高炉燃料比升高,必然导致钢铁(?)产,由此带来的经济损失远比经济燃料比带来的效益大;此外,我国煤炭资源虽然丰富,但相当长时期内炼焦煤却供不应求,降低高炉焦比仍是钢铁厂家的一项重要任务。     

3号高炉大渣比条件下高煤比操作实践

杭钢三号高炉通过对制约煤比提高的因素对症下药,加强管理,在品位逐步降低,渣量大幅度上升的条件下,煤比稳步提高到170kg/t,生铁成本大幅度下降。     

煤,焦质量对Taranto公司喷煤高炉冶炼过程的影响

过去的二十个月中，Ｔａｒａｎｔｏ的２＾＃和４＾＃高炉一直保持较高的煤比。该文详细地研究了喷煤系统利用率，燃料的质量和高炉操作参数三个方面的经验。在高煤比的条件下，高炉生产指标一般良好，但从讨论的结果可看出，在此条件下，高炉操作更付出更大的努力。燃料质量的变化如焦炭对高炉操作产生立竿见影影响，人们发现，对于煤比在１８０～１９０公斤／吨铁水以上的高炉操作变得非常敏感，要求对冶炼参数进行额外监测，对高煤     

酒钢高炉提高煤比的措施

对影响高炉煤比和煤焦置换比的原因进行了分析,并提出了提高煤比的措施。     

露天矿电铲-汽车开采工艺中的铲、车匹配

本文着重阐述了露天矿设计中电铲一汽车开采工艺中影响铲、车匹配的因素,并总结了斗容比和铲、车比的计算公式及经验选值。     

广钢4号高炉喷煤生产实践

本文从煤种、原材料、富氧、风温以及高炉日常操作、顺行等方面，论述了广钢四号高炉提高煤比的措施。     

天铁高炉合理煤比探讨

对煤比与焦比，灰比，煤气灰成分和置换比之间的关系及煤粉性能等的分析表明，在不富氧，风温大于９５０℃的情况下，天铁高炉煤比可以达到１２０－１４０ｋｇ／ｔ。进行富氧大喷煤试验，使煤比达到２００－２５０ｋｇ／ｔ，必须对煤氧系统及其它相关系统进行了改造。     

Evolution of the epidemic process as a form of solution to its internal contradictions

The author formulated the main contradition of the epidemic process consisting of contradiction between the interaction of the motive forces of the epidemic process, since this contradiction at the same time served as the imperative condition of the origination and as the cause of the subsequent arrest of the spread of infection. The main contradiction of the epidemic process is expressed in reduction of the number and limited activity of the sources of infection, attenuation or arrest of the mechanism of transmission of the causative agents, formation of immunity in the population, the appearance of hereditary resistance in the hosts to the causative agent of the infection. The action of the principal internal contradiction of the epidemic process in the course of evolution conditions genetic variability of the causative agents of the infectious diseases, intensification of the mechanisms of excretion of the parasites from the host organism, and increase of their resistance in the external environment, formation of latent forms of infection.     

Model system of binaural hearing. III. Binaural processing of information about short sounds

A model of neuronal structures of the medial superior olivary nuclei and inferior colliculus performing the determination of the direction on the source of the short (shorter than 10 ms) sound signals is presented. In the model the difference between the moments of the arrival of the two informational messages formed on the stage of monaural information processing is calculated. The result of this calculation is the firing probability of the primary detector (the neuron of the medial superior olivary nucleus). Because of the internal noise the curve of this probability as a function of the direction on the source is smoothly sloped. The estimation of the direction is the result of the statistical processing of the responses of the primary detectors ensemble. The direction on the source of sound is coded by a position of the secondary detector (the neuron of the inferior colliculus) on the direction "scale".     

STG-12变辊距型钢矫直机的设计计算

针对变辊距矫直机具有不同于恒辊距矫直机的结构特点 ,给出变辊距型钢矫直机辊数、辊距的确定方法 ,并计算出各辊的弯曲力矩及矫直力 ,最后求得设备电机功率。通过设备的具体运行证明 ,变辊距结构对改善设备的受力状况及提高型钢矫直质量十分有利     

Epidemiological assessment of the system of indices characterizing the quality of vaccine preparations

The authors discuss the methodology and the method of formation of the medico-technical requirements to newly-elaborated or modified vaccine preparations. The following are considered among the principal parameters responsible for the formation of the quality of the vaccines: the prophylactic activity, the extent of the injurious effect, the technological and the exploitation properties. A close association of these parameters in the determination of the quality of the vaccine and the dependence of the efficacy of its use on the character of the epidemic situation was shown. A possibility of using the method of calculation of the efficacy of immunization for detection of the main (leading) parameters of the quality of the vaccine elaborated which should be used in composing the medico-technical requirements. It is emphasize that one of the principal directions of the investigations is the elaboration and the assessment of the correctness of the immunological and laboratory methods of standardization and control of the methods of objective measurement of the parameters forming the quality of the vaccine preparations.     

连铸方坯中心线凝固行为波动现象及变化规律

连铸坯中心线区域钢液的凝固行为与中心偏析缺陷的形成及控制密切相关。基于中碳钢连铸方坯纵断面的实际凝固组织,以中心偏析点内部二次枝晶间距计算局部冷却速率,揭示了铸坯中心线局部冷却速率的波动特征。结合连铸三维凝固模型,研究了铸坯中心线固相率波动引起局部冷却速率波动并最终影响铸坯中心组织和性能的均匀性的机理;对不同工况铸坯中心线固相率和局部冷却速率波动的周期性进行了分析对比,提出了连铸坯凝固终点位置的周期性波动机理并得到了不同拉速下凝固终点波动距离的判断方程,对于所选连铸方坯,凝固终点波动距离为25.0～27.5 mm;在此基础之上,研究了拉速对中心线固相率波动程度的影响规律,并分析了凝固终点波动距离变化对末端电磁搅拌(final electromagnetic stirring, F-EMS)和轻压下(mechanical soft reduction, MSR)作用均匀性的影响。结果表明,拉速由1.8 m/min提高至2.4 m/min后,虽然液相穴长度增加可能增加整体偏析程度,但铸坯中心线固相率波动程度降低了20%,这有利于减轻中心线偏析沿拉坯方向的波动性,提高铸坯中心质量的均匀性。并...     

Networking for nurses in today''s turbulent times

Craniocerebral injuries involve changes in the vascular plexuses and ependyma of the ventricles, and the severity of these changes varies, depending on the duration of the posttraumatic period and severity of the injury. Analysis of the time course of pathomorphological changes in the cerebral ventricular structures extend our notions on the role and impact of liquor circulation in the pathogenesis of craniocerebral injury. Structural changes in the vascular plexuses may disorder the function of the blood-liquor barrier and promote the development of hydrocephalus. Changes in the structure of the ependymal membrane may involve dysfunction of the liquor-encephalic barrier of the inner surface of the brain and promote the development of brain edema.     

Functional analysis of patients who have had a modified Van Nes rotationplasty

Electromyographic analysis of gait in eight patients who had had a modified Van Nes rotationplasty was performed to compare the activity of the flexors and extensors of the ankle on the side of the operation with that of the flexors and extensors of the knee on the normal, contralateral side. The resemblance in the activity of the extensors was more pronounced than that of the flexors. In three patients, the angle of flexion of the knee throughout the gait cycle was the same on the side of the rotationplasty as on the normal side. There was more symmetry in the swing phase than has been reported for patients who have had an above-the-knee amputation. The strength of the dorsiflexors of the ankle on the side of the rotationplasty was 68 percent and that of the flexors was 71 per cent when compared with that of the muscles of the normal ankle.     

机床液压系统常见故障及使用维护方法分析

机床液压系统通常,下含义判断产生故障的原因。本文通过对机床液压系统常见故障进行分析,从机床液压系统振动和噪音、液压系统的冲击、液压系统中的“爬行”、液压泵出现吸空情况、液压系统温度上升五个方面进行介绍,提出诊断方法,并且介绍机床液压系统的使用和维护注意事项,希望可以帮助相关工作人员排除故障问题,保障机床液压系统的正常运作。     

采场充填料浆流动与离析规律的试验研究

为研究采场充填料浆流动规律及充填料浆离析分层对充填体强度的影响规律,开展了充填料浆流动相似模拟试验及采场原位充填体力学强度测试试验,研究结果表明：单点下料时充填料浆流动终态坡面趋向于正态分布。流动过程中充填料浆产生离析分层现象,主要表现为充填体物料的粒径沿料浆流动方向呈先增大后减小的趋势,充填体强度沿料浆流动方向呈先减小后增大再减小的倒转“S”形趋势。采场原位充填体强度在下料口附近与标准试块强度接近,在采场中间位置附近的充填体强度最小,在距离下料点采场长度7/10左右的位置充填体强度达到最大值。研究成果能够为充填采场下料管的数量及位置设计提供依据,从而保证充填体的整体质量。     

矿山地质环境调查评价技术方法的研究

党的十八大以后,生态文明建设作为中国特色社会主义建设的重要组成部分,对生态环境保护和治理提出了高标准,而矿山地质环境保护与治理是生态文明建设的主要内容之一,保护与治理工作开展前必先查明矿山地质环境现状。调查评价作为前期工作的主要手段之一,调查的范围、精度与评价技术方法的科学性、创新性,对矿山地质环境保护与治理工作成效起着决定性作用。