湖北钢丝厂2+2×0.25新结构钢丝帘线样品通过固特异公司检测

湖北钢丝厂２＋２×０．２５新结构钢丝帘线样品通过固特异公司检测１９９５年１１月，湖北钢丝厂研制开发的２＋２×０．２５新结构钢丝帘线样品经杭州物资贸易公司送交固特异轮胎橡胶公司卢森堡检测中心检测，１０项指标完全符合该公司技术标准要求，检测数据见附表。附...     

三聚氰胺中铁含量的测定

通过对三聚氰胺中铁含量测定方法的改进，提高了分析结果准确度，加快了分析速度。     

Hot-compression behavior of Al-1Mn-1Mg alloy

The hot-compression of Al-1Mn-1Mg (mass fraction, %) alloy sample was carried out on a Gleeble-1500 thermo-simulator at deformation temperatures from 320 to 400 ℃ and strain rates from 0.1 to 10 s-1 by total strain of 1.4. Microstructure and texture evolution of the hot-compressed alloy were investigated by optical microscopy and X-ray diffraction analysis, respectively. The results show that the relationship among flow stress σ, deformation temperature T and strain rate ε can be expressed in the form of βσ...     

Two-step flotation recovery of iron concentrate from Donganshan carbonaceous iron ore

The flotation of pure and natural carbonaceous iron ore samples in the oleate flotation system was investigated. Starch can depress hematite effectively in a wide pH range, but cannot depress siderite efficiently in neutral conditions. The flotation recovery of pure hematite, siderite, and quartz in the oleate-starch-CaCl₂ system is significantly different when the slurry pH varies from 4 to 12. A novel two-step flotation process was developed for the separation of iron concentrate from Donganshan carbonaceous iron ore through which the siderite concentrate is first recovered and the high quality hematite concentrates with relative high iron recovery can be obtained in the second step flotation. The siderite concentrate may be utilized directly or undergo further concentration steps to increase iron grade.     

Effects of yttrium on the formation and magnetic properties of bulk metallic glassy （Fe, Co）-B-Si-Nb alloys

The bulk metallic glassy (BMG) rods of [(Fe0.5Co0.5)0.72B0.192Si0.048Nb0.04]100-xYx (x=0-6) and [(FexCo1-x)0.72B0.192Si0.04]Nb0.04]96Y4 (x=0.5-0.8) were prepared by copper mold casting. The structure, thermal stability,and magnetic properties of the samples were studied by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and vibrating sample magnetometer (VSM). Adding lat% to 6at% of yt-trium, the bulk glassy alloy rods of [(Fe0.5Co0.5)0.72B0.192Si0.048Nb0.04]100-xYx (x=0-6) with the diameter of 3 mm were not formed, and the sample with 4at% of yttrium showed less crystalline phase than others. When the Fe/Co atomic ratio was between 5:5 and 7:3, the bulk glassy alloy rods of [(Fe1-xCox)B0.192Si0.048Nb0.04]96Y4 (x=0.5-0.8) with the diameter of 2 mm were fabricated. In the (Fe, Co)-B-Si-Nb-Y BMGs, when the Fe content increased, the thermal stability, the supercooled liquid region, and the glass-forming ability (GFA) decreased, but the saturation magnetization (Ms) increased.     

Dependence of domain wall structures on repetition n in[Pt（0.5 nm）/Co（0.4 nm）]n/NiO（1.1 nm）/[Co（0.4 nm）/Pt（0.5 nm）]n multilayers

The magnetic force microscopy and a sample vibrating magnetometer have been used to investigate the domain structure in two antiferromagnetically coupled Co/Pt multilayers.In the antiferromagnetic coupled[Pt(0.5 nm)/Co(0.4 nm)]_n/NiO(1.1 nm)/[Co(0.4 nm)/Pt(0.5 nm)]_n multilayers with perpendicular anisotropy,the antiferromagnetic interlayer coupling strength increases linearly with the repetition number n in Co/Pt multilayers.In demagnetized states,relatively shifted domain walls in the two Co/Pt multila...     

邻苯三酚红-溴化十六烷基吡啶分光光度法测定农业样品中铁

对铁 ( )与邻苯三酚红的显色反应条件进行了研究。在溴化十六烷基吡啶存在下 ,于 p H 5 .0的乙酸-乙酸钠缓冲介质中 ,铁 ( )与邻苯三酚红形成绿色配合物 ,其最大吸收波长为 64 8nm,表观摩尔吸光系数为 3 .2 0× 10 4L· (mol·cm) -1 ,铁 ( )浓度在 0～ 2 5 μg· (2 5 m L) -1范围内符合比耳定律。在酒石酸钾钠和氟化钠的存在下 ,方法具有良好的选择性 ,应用于粮食、植株样品和环境水样中微量铁的测定 ,结果满意     

国家标准样品 标准参比 荧黑3#（SRB3#）的研制

从标准参比炭黑3#(SRB3#)的定义、生产、混兑、分样、测试、数据统计等几方面介绍了标准参比炭黑3#(SRB3#)的研制及定值过程。     

水质色度环境标准样品的研究

对新研制的水质色度环境标准样品进行了稳定性检测、均匀性检验及定值,确立了水质色度环境标准样品的制备、检验与定值程序。研究结果表明,新研制的水质色度标准样品的均匀性良好,至少在两年的时间内稳定,定值方法可靠,量值准确。     

变压器油标准样品配制方法试验研究

结合变压器油中溶解气体检测装置检验工作对配制标准样品的需求,针对现有变压器油标准样品配制方法存在的问题,通过对气体在变压器油中溶解及逸散的影响因素等进行试验研究,建立了"定量进气法"和"母液稀释法"两种变压器油标准样品快速配制方法,对于指导变压器油样品配制及相关工作开展具有重要意义。