型钢垛型设计及CAD研究

描述了型钢垛型设计的主要内容，建立了型钢垛型设计的优化数学模型和方法，导出了常用型钢垛型设计计算公式，开发了型钢垛型ＣＡＤ系统，该系统设计型钢垛型灵活、方便、快捷。     

流通型碳纤维多孔电极从Au（CN）2^—稀溶液中提取金的研究

研究了电极构型对流通型碳纤维多孔电极从Ａｕ（ＣＮ）－２稀溶液中提取金的行为的影响，实验考察了顺流型和逆流型两种电极构型，在顺流型情况下，电沉积反应可以在极限电流条件下进行，而逆流型电沉积分布比顺流型沉积分布均匀，利用顺流型沉积分布曲线拟合了传质系数与流速的关系。     

LVC工作辊辊型窜辊策略及实际应用

 LVC辊型是一种具有特殊辊形曲线的新型辊型，这种辊型实现了辊缝凸度调节与板宽成线性化，可以通过窜辊来控制板形，研究LVC辊型的窜辊策略并将其应用在板形自动控制模型中。从LVC辊型上机情况看，LVC辊型有较好的辊形自保持性。从使用LVC辊型与使用常规工作辊轧制的板形工艺数据比较可知，LVC辊型可以明显改善板形质量，具有较强的实用性。     

EM型、ZGM型中速磨性能比较

国内冶金行业高炉喷煤所用中速磨，一直以ZGM、HP及HRM型中速磨为主，ZGM型中速磨的性能相对较好。2001年中国冶金设备南京有限公司引进国外技术开始生产制造EM型中速磨，到目前为止，EM型磨以其独特的性能优点异军突起，占领了一席之地。本文对EM型及ZGM型中速磨特点进行简单的比较。     

添加剂对高铁赤泥煤基直接还原的催化作用

对高铁赤泥煤基直接还原时不加添加剂以及加复合盐型，镁盐型，钙盐型，钠盐型的添加剂进行了试验研究，结果表明，以复合盐型的催化还原反应的效果为最好，同时还对添加剂催化机理进行了探讨。     

资源型企业可持续发展问题的探讨

矿产资源是国民经济发展的重要物质基础。资源型企业是国民经济发展的基础产业，是国民经济发展的支柱。针对资源型企业在矿产资源开发中存在的一些问题，提出了资源型企业可持续发展的建议，即加快资源型企业市场化开发，提高资源利用率，加强政府法制化建设、加大执法力度；加快资源型企业现代企业制度建设；限制矿产资源的无序开采，促进矿山安全生产；加强地质勘查工作，发挥地勘工作先行作用；加大资源型企业的开放力度，实现投资主体多元化、资源优化配置、规模经营。     

LVC工作辊辊型窜辊优化策略研究及应用

LVC（Liner Variable Contour）工作辊辊型是一种新型辊型，这种辊型实现了辊缝凸度随板宽变化成线性变化，并可以通过窜辊来调节板形性能。登山搜索法是常用的寻优方法，可用登山搜索法得出LVC辊型的窜辊优化策略，并将其应用在板形自动控制模型中，这样可以提高辊型的板形控制精度。从现场轧制的带钢板形工艺数据可以发现LVC辊型具有良好的实用性，能较好地提高板形质量。     

板坯连铸结晶器水口优化数理试验研究

摘要：采用1∶22水模型试验与数值模拟对结晶器浸入式水口结构的改进与优化进行探究。通过不同铸坯断面下C型水口与A型水口对结晶器流场影响效果的比较可以得到，水模试验中，C型水口较A型水口波高平均下降48.99%，冲击深度平均减少1.94%，卷渣程度平均降低80.24%，液面裸露最大宽度平均下降67.39%；数模试验中，C型水口自由液面平均最大流速vCmax=0.39m/s大于A型水口自由液面平均最大流速vAmax=0.23m/s；水模试验与数模试验结果一致，C型水口在稳定结晶器液面、减少卷渣方面均优于A型水口。     

钢包底吹气液两相流结构研究

通过水力学模型方法，对弥散型、直通多微孔型和狭缝型３种类型的透气砖底吹时在熔池中所产生的气液两相流结构进行了研究。结果表明，弥散型与直通多微孔型透气砖底吹所产生的气泡行为很接近，而与狭缝型透气砖却有所不同。弥散型和直通多微孔型透气砖底吹时，在熔池中开始产生大气泡，并使流股偏离底吹位置而摆动时的临界流量值高于狭缝型透气砖；弥散型和直通多微孔型透气砖底吹产生的气液两相流扩张角基本一致，而在一定的气体流量下，其扩张角明显大于狭缝型透气砖。     

试论高中物理教学中转化差生的措施

差生形成的原因是十分复杂的，可以分为暂时困难型，能力不足型、动力不足型、整体性困难型。教师不能把所有差生都简单归结为“脑子笨”或“不用功”，教学中应针对差生的特点进行帮助和教育，才有可能取得理想的转化效果。     

Preparation and tribological performance of electrodeposited Ni-TiB2-Dy2O3 composite coatings

TiB2 and Dy2O3 were used as codeposited particles in the preparation of Ni-TiB2-Dy2O3 composite coatings to improve its per-formance. Ni-TiB2-Dy2O3 composite coatings were prepared by electrodeposition method with a nickel cetyltrimethylanunonium bromide and hexadecylpyridinium bromide solution containing TiB2 and Dy2O3 particles. The content of codeposited TiB2 and Dy2O3 in the compos-ite coatings was controlled by adding TiB2 and Dy2O3 particles of different concentrations into the solution, respectively. The effects of TiB2 and Dy2O3 content on microhardness, wear mass loss and friction coefficients of composite coatings were investigated. The composite coat-ings were characterized by X-ray diffraction (XRD), inductively coupled plasma-atomic emission spectrometer (ICP-AES) and scanning electron microscopy (SEM) techniques. Ni-TiB2-Dy2O3 composite coatings showed higher microhardness, lower wear mass loss and friction coefficient compared with those of the pure Ni coating and Ni-TiB2 composite coatings. The wear mass loss of Ni-TiB2-Dy2O3 composite coatings was 9 and 1.57 times lower than that of the pure Ni coating and Ni-TiB2 composite coatings, respectively. The friction coefficient of pure Ni coating, Ni-TiB2 and Ni-TiB2-Dy2O3 composite coatings were 0.723, 0.815 and 0.619, respectively. Ni-TiB2-Dy2O3 composite coat-ings displayed the least friction coefficient among the three coatings. DY2O3 particles in composite coatings might serve as a solid lubricant between contact surfaces to decrease the friction coefficient and abate the wear of the composite coatings. The loading-bearing capacity and the wear-reducing effect of the Dy2O3 particles were closely related to the content of Dy2O3 particles in the composite coatings.     

固态下SiO2对二元铁酸钙形成过程的影响

 铁酸钙作为高碱度烧结矿黏结相的主要组成,其形成受SiO2的影响,但到目前为止,其影响机理尚不是十分明确。通过XRD和矿相显微镜观察,并结合Rietveld法定量分析,研究了SiO2对二元铁酸钙形成过程的影响。结果表明：Fe2O3与CaO反应,700 ℃时形成Ca2Fe2O5,在800 ℃时出现CaFe2O4,随着温度升高,Ca2Fe2O5逐渐向CaFe2O4转变。SiO2存在时,在铁酸钙形成过程中有Ca2SiO4生成,温度低于900 ℃时,受动力学条件的影响,反应速率较低,Ca2SiO4的量相对较少,另外,SiO2的阻碍作用随其质量分数的增加而增强,进而导致已形成的Ca2Fe2O5与Fe2O3未能继续反应形成CaFe2O4而使其质量分数逐渐增多;高于900 ℃时,随着温度的升高,动力学条件改善,离子扩散能力增强,其中,Fe3+通过CaFe2O4层比Ca2+通过Ca2Fe2O5层更容易,进而促进了CaFe2O4形成反应的进行,Ca2Fe2O5向CaFe2O4转变,但随着SiO2质量分数增加,Ca2SiO4的生成量增多,CaO与Fe2O3的接触面积减小,抑制了CaFe2O4的生成。     

Al_2O_3-CaO-CaF_2渣系性能的研究

对Al_2O_3-CaO-CaF_2渣系的初晶温度、电导率以及物相组成进行了研究。研究结果表明:向CaO-Al_2O_3二元系中分别添加10%、15%以及20%的CaF_2时,Al_2O_3-CaO-CaF_2系的渣样电导率随着CaF_2含量的增加而增大,初晶温度不断降低;随着渣系的温度升高,该渣样的电导率也不断增大,当添加20%CaF_2时,Al_2O_3-CaO-CaF_2渣的初晶温度为1 468℃。A_2O_3-CaO-CaF_2渣系中主要物相组成为CaAl_2O_4、Ca_2Al_3O_6F、Ca_2AlF_7以及AlF_3。CaF_2添加量为10%时,熔渣中有大量的CaAl_2O_4物质,随着CaF_2添加量的增加,CaAl_2O_4物质越来越少,而Ca_2Al_3O_6F和Ca_2AlF_7物质越来越多。     

添加剂对电化学法制备氧化亚铜粉末的影响

研究了Na2 Cr2 O7、K2 Cr2 O7、NaNO3、NaNO2 等添加剂在电化学法制备氧化亚铜粉末过程中的作用。试验结果表明 ,Na2 Cr2 O7、K2 Cr2 O7、NaNO3、NaNO2 都能有效地抑制阴极区海绵状金属铜粉的生成。相比之下 ,NaNO2 的效果最好 ,而NaNO3则不适合作添加剂。     

Preparation and performance of electrodeposited Ni-TiB₂-Sm₂O₃ composite coatings

Sm2O3 and TiB2 were used as codeposited particles in electrodeposition Ni-TiB2-Sm2O3 composite coatings to improve its performance. Ni-TiB2-Sm2O3 composite coatings were electrodeposited in the nickel sulfate,hexadecylpyridinium bromide and cetyltrimethylammonium bromide solution containing TiB2 and Sm2O3 particles. The content of codeposited Sm2O3 in the composite coating was controlled by changing the concentrations of Sm2O3 particles in the solution. The composite coatings were characterized with X-ray diffraction(XRD) and inductively coupled plasma-atomic emission spectrometer(ICP-AES) . The effects of Sm2O3 content on microhardness,wear weight loss and friction coefficient of composite coatings were investigated,respectively. The microhardness of the Ni-TiB2-Sm2O3 composite coatings was 19.35%,16.58%,2.03% higher than that of the Ni coating,Ni-Sm2O3 and Ni-TiB2 composite coatings,respectively. The wear weight loss of the Ni-TiB2-Sm2O3 composite coatings was 7,2.33,1.22 times lower than that of the Ni coating,Ni-Sm2O3 and Ni-TiB2 composite coatings,respectively. The friction coefficient of the Ni coating,Ni-Sm2O3,Ni-TiB2 and Ni-TiB2-Sm2O3 composite coatings were 0.712,0.649,0.850 and 0.788,respectively. The loading-bearing capacity and the wear-reducing effect of the Sm2O3 particles were closely related to the content of Sm2O3 particles in the composite coatings.     

烧结气氛对注射成形Fe/2Ni合金性能的影响

在H_2,H_2+N_2及真空气氛下对Fe/2Ni合金进行了烧结,讨论了烧结气氛对合金碳含量以及合金力学性能的影响;指出烧结气氛是通过H_2+N_2混合气氛中H_2脱出合金中的碳,从而影响合金的最终组织来影响合金力学性能的,因此可以通过控制烧结气氛的H_2与N_2体积比来控制合金中的碳含量,以得到所需的力学性能;并对合金脱碳机理作了初步探讨。     

Luminescent properties of SrSi2N2O2:Ce3+,Tb3+-a potential phosphor for white light emitting diodes

Ce3+ and Tb3+ co-doped SrSi2N2O2 phosphors were prepared by solid-state reaction. The X-ray diffraction pattern exhibited that the phosphor consisted mainly of oxygen-rich SrSi2N2O2. The optical properties of SrSi2N2O2:Ce3+, SrSi2N2O2:Tb3+ and SrSi2N2O2:Ce3+,Tb3+ were studied, respectively. The emission intensity of Tb3+ at 541 nm was remarkably enhanced by Ce3+ in SrSi2N2O2:Ce3+,Tb3+ phosphor, which was attributed to the energy transfer from Ce3+ to Tb3+. The chromaticity coordinates of phosphors were investigated as a function of Tb3+ concentration. When the Ce3+ and Tb3+ concentrations were 0.02 and 0.18 mol per formula unit, respectively, the chromaticity coordinate was (0.257, 0.337) in the CIE 1931 chromaticity diagram. SrSi2N2O2Ce3+,Tb3+ phosphors could be used for white light emitting diodes.     

Transformation Behavior and Mechanical Properties of Al2O3/ZrO2(2Y) Ceramic Composites

The content of zirconia has a remarkable influerce on transformation behavior and mechanical properties of Al2O3/ZrO2 (2Y) composites. When 15% and 20% ZrO2(2Y) was added to Al2O3, the bending strength and fracture of the content of ZrO2 (2Y) on transformation and mechanical properties was investigated. The changes of m-ZrO2 and t-ZrO2 phases content before and after fracture were measured by X-ray diffraction quantitative phase analysis, It is shown that improvement in bending strength and fracture toughness of the Al2O3/ ZrO2 (2Y) composites is due to the phase transformation toughening mechanism of ZrO2 (2Y) and thermal expansion mismatch.     

Recycling of High Ferrous Bauxite Reducing Slag for Synthesis of CaAl2 Si2 O8-Al2 O3-CaAl12 O19 Composite

CaAl_2 Si_2 O_8-Al_2O_3-CaAl_(12) O_(19)( CAS_2-Al_2O_3-CA_6) composite was synthesized through reaction sintering alumina and bauxite reducing slag.The CAS_2-Al_2O_3-CA_6 composite was mainly composed of α-Al_2O_3,CAS_2,and CA_6.Gehlenite( Ca_2Al_2 SiO_7,C_2AS) phase was effectively transformed to CAS_2 and CA_6through high-temperature reaction sintering under weak oxidizing atmosphere at 1400 ℃ for 4h.SEM( scanning electron microscopy) and EDS( energy dispersive spectroscopy) analysis indicated that black and needle-shaped Al_2O_3,rhombic or irregular polygonal-shaped Fe Al_2O_4,and glassy phase Ca_2Al_2 SiO_7disappeared after the reaction sintering.The light gray and flaky hexagon crystals of Ca Al_(12)O_(19)(10μm) and the grainy particles of Al_2O_3( 2-7μm) were observed in the CAS_2-Al_2O_3-CA_6 composite.The gray crystals of CAS_2 act as the binding phase and are distributed around CA_6 and Al_2O_3.CAS_2-Al_2O_3-CA_6 composite exhibits high refractoriness and service temperature,which are 1650 ℃ and 1450 ℃,respectively.Reaction sintering of alumina and bauxite reducing slag is a feasible method for the synthesis of CAS_2-Al_2O_3-CA_6 composite.     

Study on Simultaneous Catalytic Reduction of Sulfur Dioxide and Nitric Oxide on Rare Earth Mixed Compounds

CeO2/γ-Al2O3, La2O3/γ-Al2O3, CeO2-La2O3/γ-Al2O3 and CeO2-La2O3, which were prepared by impregnating in certain ratio, were used as the catalysts for the reduction of SO2 and NO by CO. Separate and simultaneous removal of SO2 and NO over La2O3/γ-Al2O3, CeO2/γ-Al2O3, CeO2-La2O3/γ-Al2O3 were investigated. The phase characteristics of catalysts were also analyzed by X-ray diffraction. The result shows that the conversions of SO2 and NO are above 98% over CeO2/γ-Al2O3 and CeO2-La2O3/γ-Al2O3. After SO2 is added in the NO-CO-N2 system (NO∶SO2=1∶2～1∶3), the conversions of SO2 and NO are both above 98%. Furthermore, it is found that CeO2-La2O3 with various ratios has different activity for the simultaneous reduction of SO2 and NO.