气流磨粉碎原理在棕色陶瓷颜料生产中的应用

对扁平式气流磨粉碎原理进行研究,以棕色陶瓷颜料为粉碎物料,探讨工质压强,加料速度,喷嘴角度及喷嘴孔径对物料加工的影响,从而确定粉碎这一物料的工艺参数。     

科企之桥

DFJ超低温粉碎机 一种广泛应用于化工、医药、食品、塑料、生物制品等领域,具有九十年代先进水平的微粉生产线——DFJ超低温粉碎机装置,由浙江丰利粉碎设备有限公司开发成功。 该机采用液氮致冷剂粉碎在常温下难以粉碎的热塑性、纤维性等热敏性物料,有效防止被粉碎物料发热而使物料变质、变性和营养成份流失;对复合     

推广之窗

机械类T201135高效节能JTM微粉碎机高效节能JTM微粉碎机是浙江丰利粉碎设备有限公司研制成功的国家重点新产品和国家专利产品。该机结构紧凑、运行平稳、产品粒度均匀、流动性好、噪声小、能耗低,适合于一般物料粉碎,特别适用于球状物料(如金属镁粉)和热敏性(如树脂、各类塑料、石蜡等)的超细粉碎,还广泛适用于化工、农药、医药、食品、非金属矿及金属物料的微粉碎加工,粒度达10μm以下。专家认为该机的研制成功填补了国内物料球状化微粉碎的空白,其技术水平国内领先,是目前国内粉体工程行业理想的高性能、通用型的超微粉碎设备。总经理:…     

成果推广

超低温粉碎机一种应用于医药、化工、食品、塑料。生物制品等领域的高科技产品,由浙江绍兴丰利粉碎设备有限公司下属浙江师州市特种粉碎设备厂开发成功。该机采用现代科技液氮致冷剂粉碎在常温下难以粉碎的各种物料,尤其对热敏性塑料、橡胶和中草药、营养食品和饮料添加剂,经低温粉碎后能保持物料的色、香、味和成份不变,并能提高粉碎细度,改善物料流动性。同时,该机在封闭系统和惰性气氛环境中进行,噪声低,环境无粉尘污染。亦可用于易燃易爆物料的粉碎。通信地址：（爿u0则浙江省峰州市城关罗杜乔灌州机械厂联系人：余绍大王春峰联…     

磨料射流及高分子减阻改善射流性能的实验研究

本文设计了磨料射流系统及喷嘴结构,实验研究了磨料射流切割与破碎物料的性能,确定了磨料喷嘴出口的最佳长度,对清水和磨料溶液进行了射流冲击性能比较试验;并进一步在磨料射流中加入高分子聚合物添加剂,实验证明,高分子减阻剂同样对磨料射流性能有改善.     

喷动流化床射流穿透深度试验研究

提出射流穿透深度是表征喷动流化床煤气化过程中射流特性的重要参数.在300 mm×30mm×2 000 mm的喷动流化床煤气化炉冷态试验装置上,采用压力信号分析和快速摄像图像分析相结合的方法,系统地考察了喷动气速、喷口直径、物料特性、静止床高和流化气流率对射流穿透深度的影响.结果表明,射流穿透深度随喷动气速、喷口直径的增大而增大,随静止床高、物料密度、物料直径、流化气流率的增大而减小.另外,引入两相弗劳德数(Fr)、颗粒雷诺数(Rep)等无量纲参数,对试验结果进行多元回归分析,建立了喷动流化床射流穿透深度的关联式,该关联式全面考虑了各种影响因素,特别是静止床高和流化气流率的影响.关联式的预测值与本文及国内外其他一些研究者的试验值进行了比较,结果吻合得较好.     

基于可资源化的废弃印刷线路板的破碎及破碎性能

经对各种破碎机型的比较,及对废弃印刷线路板材料性能的研究,提出了采用剪切式旋转破碎机和冲击式旋转磨碎机相结合的2级破碎方式对废弃线路板进行粉碎.对物料颗粒在冲击粉碎过程进行了受力分析,在此理论分析的基础上,确定冲击破碎机的工艺参数.结果表明,该粉碎方式能对废弃线路板有效粉碎,同时对线路板中金属和非金属能有效地解离,不带电子元件的废弃印刷线路板物料在1.2 mm以下达到完全解离,而带电子元件的废弃印刷线路板则在0.6 mm以下完全解离,同时对不同物料的解离机理作了探讨和分析.从耗能的角度,用面积粉碎模型推导了废弃印刷线路物料粉碎所需能耗的经验公式.     

低温粉碎系统的研究

讨论了低温粉碎的必要性及发展趋势 ,分析了空气涡轮制冷机与流化床气流粉碎分级机组合的新型低温粉碎系统的性能特征。实验验证 ,该系统可以避免常规的液氮致冷 ,亦勿需将物料冷却到脆化程度 ,只需冷却至某一硬化状态 ,就能有效地将物料进行细碎。     

WC球磨粉碎动力学方程的探讨

本文根据球磨粉碎功转变成物料的弹性变形能,又由弹性能转变成颗粒的表面能的原理,按照球磨粉碎能耗与被球磨物料体积成正比的推论,同时考虑物料颗粒强度的体积效应,即随着尺寸的减小颗粒强度提高,磨碎所需的时间增长,建立了脆性材料的球磨粉碎动力学方程,并通过WC粉的干式球磨试验进行验证。     

紫金山铜金矿石高压辊磨产品特性研究

针对紫金山铜金矿石,开展了不同破碎方式下产品的粒度特性、裂纹性质、比表面积、孔体积和相对可磨度研究.结果表明,与常规破碎方式相比,经高压辊磨机粉碎后物料的中值直径更小,粒度分布更均匀,细粒级含量多;高压辊磨机在辊面压力为3.5 MPa时粉碎后物料的比表面积和孔体积为2.544 m~2·g~(-1)和11 mm~3·g~(-1),比常规破碎产品分别提高了12.36%和22%;高压辊磨机在辊面压力为5.5 MPa时粉碎后物料的比表面积和孔体积分别为2.568 m~2·g~(-1)和13 mm3·g~(-1),比常规破碎产品分别提高了13.42%和33%,表明高压辊磨机粉碎物料粒度细、颗粒裂纹更多,且高压辊磨机粉碎后物料由于裂纹丰富,故更易磨.     

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.     

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.     

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.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with