焦球在半密闭电石炉中的应用

在23MVA半密闭电石炉上试验焦球,通过从焦球的储存环境、投料工艺、料面操作等方面进行工艺优化后,焦球得到合理利用,电石产品在电耗指标基本保持不变的情况下,质量明显上升,同比工艺优化前电石发气量提高3L/kg,优、一级品率提高5.23%,同时也降低了成本。

合理使用焦球、石灰球降低电石生产成本

在40 500 kV·A密闭电石炉中试用焦球及石灰球,通过优化两球入炉投加方式、料面处理等工艺操作,使两球得到合理利用,电耗、电石发气量、产量等参数稳定,不仅大大降低了电石的生产成本,而且减少了粉尘污染。

焦球在石灰生产中的应用

在立式石灰窑中使用焦球，电石炉过筛焦粉得到合理利用，通过工艺优化措施，提高焦球质量，石灰产品质量满足电石炉生产工艺要求，降低了生产成本，取得了较好的经济效益。

土焦球铁的热处理工艺

土焦球铁的热处理工艺农机工业飞速发展，球铁需要量日益增多，如何用土焦浇铸符合性能要求的球铁铸件，就成为目前球铁生产中迫切需要解决的问题。一、问题的提出；我们于１９８７年用山西焦、本溪生铁生产了一批柴油机齿轮，在未经热处理时，箕塑性差、韧性偏低，不能满...

唐钢炼铁厂400m^3高炉加焦球生产实践

介绍了唐钢炼铁厂400m3高炉为了降低燃料消耗,进一步降低成本而采用加焦球的生产工艺过程及应用效果。

NUMERICAL INVESTIGATION OF TOROIDAL SHOCK WAVES FOCUSING USING DISCONTINUOUS GALERKIN FINITE ELEMENT METHOD

A numerical simulation of the toroidal shock wave focusing in a co-axial cylindrical shock tube is inves- tigated by using discontinuous Galerkin （DG） finite element method to solve the axisymmetric Euler equations. For validating the numerical method, the shock-tube problem with exact solution is computed, and the computed results agree well with the exact cases. Then, several cases with higher incident Mach numbers varying from 2.0 to 5.0 are simulated. Simulation results show that complicated flow-field structures of toroidal shock wave diffraction, reflection, and focusing in a co-axial cylindrical shock tube can be obtained at different incident Mach numbers and the numerical solutions appear steep gradients near the focusing point, which illustrates the DG method has higher accuracy and better resolution near the discontinuous point. Moreover, the focusing peak pres- sure with different grid scales is compared.

Influence of hydrogen-enriched atmosphere under coke oven gas injection on reduction swelling behaviors of oxidized pellet

It is of great importance to elucidate reduction swelling behaviors and reaction mechanism of oxidized pellet in hydrogen-enriched atmosphere under coke oven gas injection. In this work, the effects of hydrogen concentration in N_2-CO-H_2 atmosphere with unchanged CO content on reduction swelling behaviors of oxidized pellet at 1173 K were studied, to clarify the mechanism of hydrogen-enriched reduction and exclude the influences of CO. Then, the reduction swelling behaviors of oxidized pellet at 1173 K in actual atmosphere under coke oven gas(COG) injection, got from the simulation results of multi-fluid blast furnace model, were investigated. The results show that with the concentration of hydrogen increasing in N_2-CO-H_2 gas from 2% to 18%, the reduction swelling index of pellet decreases from 10.12% to 5.57% while the reduction ratio of pellet increases obviously from 39.85% to 69.58%. In addition, with COG injection rate increasing from 0 to 152.34 m^3/t, the reduction swelling index of pellet decreases slightly from 10.71% to 9.54% while the reduction ratio of pellet is increased from 31.57% to 36.39%. The microstructures of pellet are transformed from the platy structure to the flocculent structure.

Methods for the development and assessment of atrial fibrillation and heart failure dog models

Objective To report Medtronic experiences with the development of animal models for atrial fibrillation （AF） and chronic heart failure （CHF） using high-rate pacing for AF and microemboli for CHF. Methods For the AF model, an atrial lead was attached to a Medtronic SynergyTM neurostimulator, which was programmed to stimulate at 50 Hz in an on-off duty cycle. Atrial natfiuretic peptide （ANP）, brain natriuretic peptide （BNP） and N-terminal pro brain nalriuretic peptide （NT-proBNP） were assayed at select time points. For CHF model, a serial injection of 90 μm polystyrene microspheres at 62,400 beads/mL （Polybead, Polysciences, Inc.） was performed to induce global ischemia, either with weekly monitoring and embolization schedule （group 1, n = 25） or with biweekly monitoring and emboliation schedule （group 2, n = 36 ）. Echocardiograms were used along with ventriculograms and magnetic resonance imaging scans weekly to assess cardiac function and ANP, BNP and NT-proBNP were monitored. Results For the AF model, the days to sustained AF for four animals following surgery were 7, 25, 21 and 19, respectively; For the CHF model, the days to meet CHF endpoints were 116 in group 1 and 89 in group 2. For both AF and CHF models, NT-proBNP correlated well with the development of disease states. Conclusion Our experience for the development and assessment of AF and CHF dog models may help researchers who are in search for animal model for assessing the safety and efficacy of a device-based therapy.

Structural Characteristics of Mesophase Spheres Prepared from Coal Tar Pitch Modified by Phenolic Resin

Mesocarbon microbeads （MCMB） were prepared from coal tar pitch modified by phenolic resin and from the same pitch modified by phenolic resin and hexamethylenetetramine at 440℃ for lh. By investigating the morphology of mesophase spheres and the structure of the MCMB carbonized at 1000℃ for lh using scanning electron microscope （SEM） and XRD, it was found that phenolic resin accelerated the formation and coalescence of mesophase spheres. Some of the obtained MCMB were hi- or tri-spheres with the distorted microtextural carbon layers. Hexamethylenetetramine in the pitch modified by phenolic resin accelerated the condensation of phenolic resin and consequently expedited the combination of mesophase spheres, which was proved by the formation of some tetra-spheres. Owing to the cross-linkage of the additives, MCMB with complex structure were obtained.

Simulation of thermal field induced by concave spherical transducer in multi-layer media

High intensity focused ultrasound(HIFU)therapy is an effective method in clinical treatment of tumors,in order to explore the bio-heat conduction mechanism of in multi-layer media by concave spherical transducer,temperature field induced by this kind of transducer in multi-layer media will be simulated through solving Pennes equation with finite difference method,and the influence of initial sound pressure,absorption coefficient,and thickness of different layers of biological tissue as well as thermal conductivity parameter on sound focus and temperature distribution will be analyzed,respectively.The results show that the temperature in focus area increases faster while the initial sound pressure and thermal conductivity increase.The absorption coefficient is smaller,the ultrasound intensity in the focus area is bigger,and the size of the focus area is increasing.When the thicknesses of different layers of tissue change,the focus position changes slightly,but the sound intensity of the focus area will change obviously.The temperature in focus area will rise quickly before reaching a threshold,and then the temperature will keep in the threshold range.

The Research On Competitive Cognitive Trait Anxiety Of China＇s Young Female Volleyball Athletes

This paper makes a research on competitive cognitive trait anxiety of China＇s female volleyball reserve athletes using the Psychological Measurement, studying the differences between different groups, sport time and sport grades. The results show that the Failure Anxiety of China＇s young women＇s volleyball athletes is less than that of the norm, while the other kinds of anxiety are more. The athletes whose sports time is more than seven years have a higher level of Injury Anxiety, so is the anxiety when preparing for matches of Three Stage Athletes than One Stage Athletes and Two Stage Athletes. In comparison with Level Two Stage Athletes and Level Three Stage Athletes, Level One Stage Athletes＇ ability anxiety is higher. The anxiety of fonts＇ playing competitive level is more than setters. Based on different athletes, we should take different measures, in order to improve their psychological resilence through training and increase their tolerance when facing difficulty through matches.

A Focus： Epitomizing Approaches of Effective Employability Skills

The present paper reveals the pivotal challenges of fast changing global work environment and industrial needs. Employability skills need to be checked rather than unemployment problem in India. The paper further aims to explore the necessary skills to the challenges of globalizing trends. The issues, approaches, and remedial strategies are focused with reference to the people＇s skills. As the reflections of quality and competence depend on transparency and accountability of the organization, it is necessary to improve the required skills which enhance the levels of confidence. The potential employer＇s requirements are need to be worked very keenly by the institutions. The paper also deals with the effective learning process, which is at par with global counter parts. Exposure to the universal student-centered learning is emphasized to enhance the very crucial pace of work place. Finally this paper studies effective micro and macro issues regarding the dynamics of the industry by applying a broad range of employability skills complementing the technical skills.

Summer Davos Focuses on Innovation

Themed＂Creating Value Through Innovation,＂the key words for the 2014Tianjin Summer Davos Forum,held September 10-12,are transformation,innovation,sustainable development,and competitiveness among countries and regions in global collaboration.With a total of 1,882 entrepreneurs,

Modeling of Focused Acoustic Field of a Concave Multi-annular Phased Array Using Spheroidal Beam Equation

A theoretical model of focused acoustic field for a multi-annular phased array on concave spherical surface is proposed. In this model, the source boundary conditions of the spheroidal beam equation （SBE） for multi-annular phased elements are studied. Acoustic field calculated by the dynamic focusing model of SBE is compared with numerical results of the O＇Neil and Khokhlov-Zabolotskaya-Kuznetsov （KZK） model, respectively. Axia/dynamic focusing and the harmonic effects are presented. The results demonstrate that the dynamic focusing model of SBE is good valid for a concave multi-annular phased array with a large aperture angle in the linear or nonlinear field.