Techniques and Apparatus for Measuring Rotational Core Losses of Soft Magnetic Materials

In many situations such as the cores of a rotating electrical machine and the T joints of a multiphase transformer, the local flux density varies with time in terms of both magnitude and direction, i.e. the flux density vector is rotating. Therefore, the magnetic properties of the core materials under the rotating flux density vector excitation should be properly measured, modeled and applied in the design and analysis of these electromagnetic devices. This paper presents an extensive review on the development of techniques and apparatus for measuring the rotational core losses of soft magnetic materials based on the experiences of various researchers in the last hundred years.     

A Study of the Compatibility Between Asphalt and SBS

In this article, the compatibilities between different components of a base asphalt and styrene butadiene styrene (SBS) have been analyzed from microscopic structures. Specifically, the asphalt was separated into three components: saturates, aromatics, and resins, by Solvent Recycled Absorption Chromatography Separation Technology (SRACST). The compatibilities between these different components and the polymer were compared with the help of Fluorescence Microscope (FM) with which the existing state of the polymer SBS in these different components could be examined obviously. The modified effects indicated that aromatics could cause SBS swollen and, resins dissolved SBS better than saturates, though both the two components could partially dissolve SBS and the two mixtures presented two immiscible phase systems. In order to further investigate the compatibility between aromatics and SBS, from macroscopic properties, an additive rich in aromatics was added to the SBS/asphalt mixture, and the result was satisfactory.     

再生骨料绿化混凝土的研究

本文主要介绍了绿化混凝土的概念、分类,绿化混凝土构筑适合于植物生长环境的措施。通过对再生骨料绿化混凝土的原材料和配合比试验以及物理力学性能及耐久性能试验,为进一步的工程应用提供了可靠的依据。     

河南油田泌阳凹陷稠油地化录井评价方法

河南油田泌阳凹陷分布有古城、井楼、杨楼、新庄4个稠油油田，各油田油质复杂，查清各区块、各层系稠油油质是开发生产的重要工作之一。通过对稠油层基本特征分析，应用地化录井参数建立了TPI评价法、原油密度评价法及原油黏度评价法。TPI评价法主要是利用原油中气态烃和液态烃与全烃比值大小划分油质类型；原油密度评价法主要利用油质重，TPI值小，反之TPI值大的关系划分油质类型；原油黏度评价法主要利用TPI反映油质组分的综合性参数的特点，建立TPI与黏度的关系。这套评价评价方法提供了快速精细评价稠油油质的新手段。     

普通热轧钢材的合理洁净度及生产工艺探讨

钢凝固前、后生成的非金属夹杂物形貌和在钢中的分布特点不同,凝固前生成的夹杂物尺寸较大,在钢中随机分布,主要影响钢材的疲劳强度和延性等性能。凝固后生成的夹杂物尺寸小,主要在晶界富集析出。硅锰脱氧钢脱氧后钢液仍含有20×10-6以上溶解氧,这部分溶解氧在钢凝固后绝大多数会转变为微细的氧化物或氧硫化物夹杂。钢凝固后生成的夹杂物主要影响钢材的冲击韧性、韧-脆转换温度等性能。 对热轧长型材用普碳钢和低合金钢不必采用铁水脱硫预处理,对热轧钢板用普碳钢可采用铁水轻度脱硫预处理,对热轧钢板用低合金高强度钢可采用铁水脱硫预处理、炼钢过程抑制回硫和出钢过程脱硫的工艺。对超低硫低合金钢,在钢水炉外精炼脱硫处理过程钢-渣间须维持非常低的氧势,炉渣成分应控制在CaO:SiO2:Al2O3=60％～65％:4％-8％:30％～35％范围。 普通热轧长型材用钢脱氧后溶解氧含量可放宽至(30-50)×10-6,对中、厚板钢溶解氧含量必须较严格控制,最好采用铝脱氧将溶解氧控制在较低的水平,并将T[O]含量控制在50×10-6以下。采用降低炼钢终点钢水氧含量、出钢挡渣、CAS和CAB等较简易炉外精炼方法和防止铸坯夹渣等措施,能够生产满足普通热轧钢洁净度要求的高品质钢材。     

WC含量对弥散强化铜Cu/WC组织与性能影响的研究

对以WC粒子为第二相的弥散强化铜材料的组织与性能进行了研究。在同样条件下，用机械混料方法制备了不同WC含量的Cu/WC复合材料，分别测定了其密度，电阻率和硬度，结果表明：WC粒子是一种较为理想的弥散相，并且WC体积含量为1.2%时，细小的球形状第二相粒子均匀分布，弥散效果好，材料密度，硬度较高，而电阻率较小，综合性能较好。     

Al2O3对唐钢高炉炉渣性能的影响

针对唐钢近2年提高进口矿配比后，Al2O3含量升高对炉渣流动性带来的不利影响，对唐钢高炉的炉渣性能进行了试验研究。并结合国内同行业的生产实践经验，从理论上分析了炉渣中Al2O3及MgO的适宜含量范围，着重论述了唐钢所处冀东矿区条件下降低Al2O3的主要途径及适应高Al2O3炉渣的具体措施。     

Effect of Rare Earth Elements on Thermal Fatigue Property of Low Chromium Semi-Steel

The effect of rare earth elements on eutectic carbide‘s morphology of low chromium semi-steel in as-cast state and after heat treatment was investigated, and accordingly, the thermal fatigue property of this material was studied. The results show that RE can improve the eutectic carbide‘s morphology, inhibit the formation and propagation of thermal fatigue cracks, therefore, promote the thermal fatigue property, which is more noticeable in case of the RE modification in combination with heat treatment. The optimal thermal fatigue property can be obtained when treated with 0.2% RE modification as well as normalization at 950℃ for 3h.     

Synthesis,Characterization and Luminescent Properties of Complexes of Rare Earth Nitrates with Tris{2-[N-(pyridine-methanoyl)amino]ethyl} amine

Duringthelastdecade ,thedesignandsynthesisoftripodalligandsandtheirmetalcomplexeshaveattractedconsiderableattentionduetotheirpotentialusesaslumi nescentprobesinmedicineandbiochemistry[1～ 7] ,ascatalysts[8] andelectrochemicalmaterials[9] .However ,thecomplexesofrareearthmetalwithtripodalligandshavefewreported[10 ] .Asanextensionofourstudiesoncomplexesofmetalwithtripodalligands ,anewtripodalligand (tris { 2 [N (pyridine methanoyl)amino]ethyl}amine ,L)anditscomplexeswithrareearthnitratesweresyn…     

短脉冲激光与岩石相互作用机理初探

石油开采过程中，为增大原始岩体的渗流速度，一般采用水压致裂或射孔弹的方法来加以实现，但两种方法都存在一定缺陷。为探索一种新概念石油开采技术，即采用激光技术增大原始岩体的渗透率，对短脉冲激光辐照自然、饱水和饱油状态的花岗岩、大理岩和红砂岩的响应作了初步研究。得到了激光辐照下，岩石试样内烧蚀坑的三维形态以及烧蚀状态与脉冲数的初步关系。结果表明：脉冲激光可以在试样局部产生一定的裂纹；饱油试样的烧蚀情况较饱水和自然状态更严重。但对于产生的裂纹数量，尺寸以及方向等方面的控制尚需进一步的工作。