Results of surgical correction of constriction function of cardia

The results of surgical correction of insufficiency of locking function of cardia in 113 patients are analysed. The X-ray and endoscopic examination, intraesophageal measurement of pH, manometry in esophago-gastric connection were used to study the reasons of cardia insufficiency in chronic diseases of gastro-intestinal tract. The indications for surgical correction of this status are formulated. The original operation of the dosed out cardio-esophagofundoplication is advocated as the most effective operation in such condition. The rate of morbidity after this type of surgery is 3.1% vs. 41.9% after the fundoplicatin by the method of Nissen.     

Pseudarthroses of the bones of the extremities of gunshot origin

The causes of formation of false joints of shot origin are given in the present paper. The treatment included internal and transosseous osteosynthesis. In presence of fistula form of the chronic osteomyelitis preliminary necr- and sequestrectomy carried out. The shortening was resected by bone osteotomy and distraction by apparatus combined with false joint compression. The most frequent appeared to be purulent complications and nonremoved extremity deformity. Adhesion was achieved after 151 operation.     

Investigation of regularities of ion flotation of copper with the use of sodium diethyldithiocarbamate

The regularities of the ion flotation of copper are investigated with the use of sodium diethyldithiocarbamate (DEDTK) in an apparatus designed at the Moscow Institute of Steel and Alloys. The results of investigation into the structure of the obtained precipitates of copper DEDTK are presented. The distribution over the size of air bubbles in a new flotation apparatus is analyzed. The effect that a series of factors have on the degree of removal of copper ions from model solutions is shown.     

Method of natural periodization of processes

The method of natural periodization of processes based on objective quantitative account of the dynamics of changing of certain parameters is described. The natural periodization has been established by analysis of the data dynamic series, the distribution of observation terms being made with regard for the a priori taken rate of changes of the parameters under study. The possibility to compare different parameters has been achieved by using centrated approximated data. The discovering of natural periods can be performed by analysis of the group of centrated data. The variation of the variation coefficient of centrated ordinates in each temporal point can be calculated for objectivization of the evaluation. The investigation of developmental changes of the thyroid of A/H mice with employment of methods of morphometry and quantitative histochemistry is taken as an example.     

Behavior of Ellipsoids of Two Sizes

The influence of particle shape on granular material response is examined by using the discrete element method. Triaxial drained and undrained tests were performed on specimens of ellipsoids of two sizes. The triaxial test boundary conditions were simulated with a recently developed boundary mechanism. Different loading paths including axial compression, axial extension, lateral compression, and true extension were employed. The specimens were composed of 1,170 ellipsoids having two types of particles. The specimen is made up of 50% by weight of Type I particles that have an aspect ratio of 1.2. The aspect ratio of the Type II particles varies between 1.5 and 2. The specimens were consolidated isotropically before shearing. Comparing with the behavior of specimens of mono-size particles, a higher friction angle and a more complex particle shape effect were observed. The friction angles from the drained tests (axial extension, true extension, and lateral compression tests) were similar and the values are higher than that of the axial compression test. All simulated results are in good agreement with laboratory observation of sands.     

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The influence of basic characteristics of eight iron ores on properties of sinter was investigated by mini-sintering and sinter pot test. The results show that the tumbler index of sinter rises with the increasing of the strength of bonding phase and crystal strength. The RDI??3. 15 mm of sinter can be improved when liquid phase fluidity and creating ability of calcium ferrite of iron ores increase. The RI of sinter mainly relates to the kinds of iron ores and sintering technological parameters. The sinter RI of magnetite ores rises with the increasing of liquid phase fluidity and creating ability of calcium ferrite but has little relationship with other basic characteristics of iron ores.     

金属半固态加工技术的应用与进展

半固态加工技术具有高效、节能、近净形生产以及制成品显微组织细化均匀、力学性能好等诸多优点，是一种很有前途的加工方法。介绍了半固态加工的原理、特点，以及用于制备合金和复合材料的研究情况及应用前景等。     

Ag标准储备溶液质量浓度的不确定度评定

文章系统地分析了以高纯金属银制备原子吸收光谱分析(AAS)所使用的标准储备溶液过程中的不确定度来源,建立了数学模型,对不确定度分量进行了分析和量化,求得Ag标准储备溶液质量浓度的标准不确定度和扩展不确定度分别为0．1mg/L和0．2mg/L。     

高炉煤气干法除尘系统除盐研究

通过燃烧部分高炉煤气从而加热进入透平机的煤气温度,从而减少或杜绝TRT透平机内积盐,最后在TRT出口处通过煤气洗涤塔将酸性气体除掉。该方法同时具有提高TRT发电量作用。     

锅炉排污余热利用实践

介绍了锅炉排污余热利用节能工作的实践。将锅炉排污热水收集到水箱,用热水泵送入热网采暖用补给水箱,或直接送入采暖管道中用于采暖系统,使锅炉排污水得到充分利用,既节水又节能。     

Determination of the nature and evaluation of the degree of manifestation of various angiographic signs

The effect of different doses of prostaglandin E2 on renin secretion in isolated perfused rat kidney has been studied. The infusion of 5 ng/ml of prostaglandin E2 produced a significant rise on renin secretion compared with control group. A dosage increase of prostaglandin E2 (10 and 50 ng/ml) produced an increase in the released renin. From this a correlation between doses and responses can be obtained. The perfusion pressure was slightly--but significantly--modified with the highest dose of prostaglandin (50 ng/ml). The possible pathways of action are dicussed.     

钢包底吹氩控制系统的优化设计

分析了炼钢工艺中吹氩难以控制的原因,提出了控制氩气搅拌能的策略,进而得到了固定压力而控制流量的方案;并应用PCM脉冲编码技术和模糊控制理论,对钢包吹氩的流量进行了精确的智能控制。该系统已在多家炼钢厂投入运行。     

氧化铝悬浮液稳定性的研究

通过改变球磨时间、分散剂用量对氧化铝悬浮液浆料的稳定性、分散性以及流变性进行了研究。结果表明：球磨时间和分散剂用量对氧化铝悬浮液的稳定性和分散性有着显著影响。最佳球磨时间在20h左右；纯氧化铝粉体的等电点在pH=8．1左右，分散剂的加入使等电点朝低pH方向移动，且可以显著改善浆料在碱性条件下的稳定性。     

The Characteristics of Adsorption and Desorption of Rare Earth Elements by the Main Types of Soils of China

The adsorption-desorption behavior of the mixed rare earth elements(RE)on the main types ofsoils of China,kaolinite and synthetic oxides was studied.The isothermal adsorption of RE was fitted toLangmuir.Freundlich and Temkin equations.The main factors determining the RE adsorption capacity ofthe soils are the type of clay mineral and the content of amorphous iron oxide in the soils.The above two fac-tors and the pH of soil determine the RE adsorption ability of the soils.The soil and synthetic iron,manga-nese oxides strongly adsorb RE specifically.     

Prediction of mechanical properties of the cancellous bone of the mandibular condyle

The mechanical properties of cancellous bone depend on the bone structure. The present study examined the extent to which the apparent stiffness of the cancellous bone of the human mandibular condyle can be predicted from its structure. Two models were compared. The first, a structure model, used structural parameters such as bone volume fraction and anisotropy to estimate the apparent stiffness. The second was a finite element model (FEM) of the cancellous bone. The bone structure was characterized by micro-computed tomography. The calculated stiffnesses of 24 bone samples were compared with measured stiffnesses. Both models could predict 89% of the variation in the measured stiffnesses. From the stiffness approximated by FEM in combination with the measured stiffness, the stiffness of the bone tissue was estimated to be 11.1 +/- 3.2 GPa. It was concluded that both models could predict the stiffness of cancellous bone with adequate accuracy.     

新型热轧钢卷运输系统研究

介绍了项目的背景、概况及热卷运输的特点，分析了常用的热卷运输方式的特点，详细研究了托盘式运输方案的难点和关键点，提出了首钢京唐钢铁联合有限责任公司热卷运输系统的方案。     

除尘器的改造及管道优化

介绍了干燥烟尘的性质,分析、比较了湿法除尘、电除尘、袋式除尘3种干燥烟尘除尘方式的优缺点。叙述了中原冶炼厂袋式除尘工艺的改造过程、措施及对除尘通风管道进行的优化设计。除尘器改造应用实践表明,精炼车间粉尘回收率大大增加,除尘效果良好。     

Evaluation of the allergenicity of spore and mycelia extracts of Pisolithus tinctorius

The antigenic and allergenic chemical analysis of spore and mycelia extracts of Pisolithus tinctorius was carried out. The spores were collected from basidiocarps in plantations of Eucalyptus spp and the mycelia from culture in MNM medium. With basis on the fungus growth curve, the mycelia masses were obtained after 10, 20, 30, and 40 days of incubation, which correspond, respectively, to the beginning, middle and end of the log phase, and beginning of the decline phase. The mycelia masses, together with the spores, were submitted to the action of three extractors (Coca, Tris-HCl, and ammonium bicarbonate). The contents of carbohydrates and proteins were determined. The SDS-PAGE electrophoretical analysis revealed separate fractions in these extracts, besides common fractions, in function of cultivation time and extraction methods. The selected extracts for the allergic tests were the ones with the highest number of fractions. The prick-tests were conducted in 374 patients--rural workers, eucalyptus plantation workers, and college students. The positivity to the "prick test" with the antigenic extract of P. tinctorius was, respectively, 3.78%, 28.20% and 6.40%. Most prick-test positive patients (82.75%) also presented symptoms of respiratory allergy (asthma and rhinitis). There was no reactivity difference when the spore and mycelia extracts were employed. The analysis of the positive patients' sera revealed the presence of IgE specific to the P. tinctorius antigens. Since Pisolithus tinctorius is found as mycorrhiza of Eucalyptus spp, and this plant is used in reforestation in most countries, the importance of that fungus should be regarded as a possible cause of respiratory allergies, especially in occupationally exposed workers.     

Production of silicon nitride by the acid enrichment of products of combustion of ferrosilicon in nitrogen

Production of silicon nitride by acid enrichment of products of interaction between ferrosilicon and gaseous nitrogen under conditions of self-propagating high-temperature synthesis (SHS) is studied. The effect of the nature of acid, its concentration, agitation of solution, and process temperature is determined. The reaction of the Si₃N₄ + Fe composite powder and the hydrochloric acid solution is found to have a stage behavior. The apparent activation energy of iron passing into the solution is determined. The purity of the produced Si₃N₄ powder is demonstrated to depend on a degree of nitration of SHS products. The chemical and phase composition of the powder and its specific surface are determined.     

Extraorganic forms of abdominal localization of echinococcosis

The author has analysed 66 pateints (5.4% of all cases of the disease) with extraorganic abdominal echinococcosis. The forms of retroperitoneal (lumbar, pelvic, mesenteric and omental) and intraperitoneal echinococcosis (primary cystic and adhesive-disseminated) are differentiated. The problems of diagnosis, the differential diagnosis and selection of an appropriate therapy are discussed. The mortality in multiple and associated affections was within the range of 10 per cent.