多硫化物体系中物质平衡的理论研究

多硫化物溶液除了含有S2-、S22-、S32-、S42-、S52-、HS-、H2S外,还存在S2O32-、HS2O3-、H2S2O3、S4O62-、S5O62-、S2O42-、HS2O4-、S3O62-等。通过它们之间的一系列化学反应,并参考硫化钠浸出镍电解液除铜渣试验结果,通过热力学计算得出了多硫化物溶液体系中各物质的分配平衡。     

新型功能材料钨离子液体的合成及表征

合成了一系列由阳离子N-甲基咪唑和阴离子WO2-4组成的新型离子液体:2-(1-丙基-3-甲基-咪唑)钨酸盐(记为[C3mim]2[WO4])、2-(1-丁基-3-甲基-咪唑)钨酸盐(记为[C4mim]2[WO4])、2-(1-戊基-3-甲基-咪唑)钨酸盐(记为[C5mim]2[WO4])、2-(1-己基-3-甲基-咪唑)钨酸盐(记为[C6mim]2[WO4])。对上述离子液体进行了表征以及结构验证。     

王兆文

根据阿基米德原理测量了低温铝电解质Na3 AlF6-AlF3 -Al2 O3 (3% ) -CaF2 (3% ) -MgF2(3% ) -NaCl体系的密度 ,通过回归正交设计计算得到了NaCl含量 (B/ % ) ,冰晶石分子比(CR) ,电解温度 (T/℃ )与电解质密度 (ρ)之间关系的回归 :方程 ρ =4 .35 4 - 8.4 6 4× 10 -3 T+1.983(CR) +2 .0 2 3× 10 -2 B - 2 .882× 10 -4T(CR) +4.70 7× 10 -5TB - 1.6 2 8× 10 -2 (CR)B+4.10 9× 10 -6T2 - 3.84 1× 10 -1(CR) 2 - 2 .0 14× 10 -3 B2 以及经简化方程 :ρ =2 .730 5 - 1.2 2 5× 10 -3 T +2 .2 0 4× 10 -1(CR) - 2 .0 14× 10 -3 (B - 8.2 92 ) 2 ,并讨论了NaCl含量对低温铝电解质密度的影响 ,实验结果表明 :氯化钠含量为 12 %、分子比为 1.5时 ,电解质与铝液的相对密度差大于 15 %。     

NaCl对低温铝电解质密度影响的研究

根据阿基米德原理测量了低温铝电解质Na3AlF6-AlF3-Al2O3(3%)-CaF2(3%)-MgF2(3%)-NaCl体系的密度,通过回归正交设计计算得到了NaCl含量(B/%),冰晶石分子比(CR),电解温度(T/℃)与电解质密度(ρ)之间关系的回归:方程ρ=4.354-8.464×10-3T+1.983(CR)+2.023×10-2B-2.882×10-4T(CR)+4 707×10-5TB-1.628×10-2(CR)B+4.109×10-6T2-3.841×10-1(CR)2-2.014×10-3B2以及经简化方程:ρ=2.730 5-1.225×10-3T+2.204×10-1(CR)-2.014×10-3(B-8.292)2,并讨论了NaCl含量对低温铝电解质密度的影响,实验结果表明:氯化钠含量为12%、分子比为1.5时,电解质与铝液的相对密度差大于15%.     

硫化碱溶液中SbS_4~(3-)和SbS_3~(3-)的测定

电解提锑的硫化钠溶液中含有SbS_4~(3-)、SbS_3~(3-)、AsS_3~(3-)、SnS_3~(2-)、S~(2-)、S_x~(2-)、SO_3~(2-)、S_2O_3~(2-)、SO_4~(2-)、CO_3~(2-)和OH~-等组分。在电积过程中SbS_4~(3-)消耗的电能更多,所以需要控制其含量。 在酸性溶液中微量锑的价态分析有过不少报导。五岛文韶对不同价态的锑、砷、锡作了色层分离研究,但锑(Ⅴ)与锑(Ⅲ)不能分开。针对硫化碱电解溶液,文献提出用水解比色法测定锑(Ⅲ)量。我们试验发现该法灵敏度低,标准不稳定,得不到准确结果。曾有人提到过SbS_4~(3-)对S_x~(2-)的测定有影响,建议把S_x~(2-)的量代替     

系列Schiff配体及其Eu(Ⅲ),Tb(Ⅲ)配合物的合成、表征及荧光性质

为了研究Schiff类稀土配合物的组成和荧光性质,合成了N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯基甲烷(L1),N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯基甲烷(L2),N,N’-二(2-羟基-1-萘酚醛)-4,4’-二氨基二苯醚(L3)3种配体及其Eu(Ⅲ),Tb(Ⅲ)配合物。通过对配体和配合物的红外吸收、核磁共振、紫外吸收、元素分析、差热—热重、摩尔电导率及荧光光谱的测定分析了配合物的组成和性质。结果表明,配合物的组成为RE2(NO3)4.L4.2H2O(RE=Tb3+,Eu3+;L=L1,L2,L3),每个稀土离子与5个O、4个N配位,配位数为9,还有2个结晶水。室温下,Eu(Ⅲ),Tb(Ⅲ)配合物均有荧光发射,且Eu(Ⅲ)配合物发射出更强的Eu3+特征荧光,说明该类配体敏化Eu3+发光比Tb3+发光程度更大。     

等离子喷涂纳米Al_2O_3-13%TiO_2涂层的研究现状和展望

本文综述了国内外制备纳米Al2O3-13%TiO2团聚粉末和等离子喷涂纳米Al2O3-13%TiO2涂层的组织结构及其性能的研究现状。分析了影响纳米Al2O3-13%TiO2团聚粉末性能的因素;讨论了纳米Al2O3-13%TiO2涂层双重结构的形成机理,及其组织形貌和性能;指出制备纳米Al2O3-13%TiO2涂层存在的问题并展望了未来的应用前景。     

邻氨基苯甲酸-联吡啶-混合稀土(Eu、Tb)配合物的荧光研究

:研究用邻氨基苯甲酸铵、2 ,2’-联吡啶与氯化铕、氯化铽在水 -乙醇溶液中反应合成了邻氨基苯甲酸- 2 ,2’-联吡啶 -铕铽异核稀土配合物 ,并测定了配合物的红外光谱。红外光谱数据表明 :邻氨基苯甲酸中的羧基和氨基均与稀土离子配位 ,联吡啶中的氮也与稀土离子配位 ;由元素分析数据推测 ,配合物的化学组成式为(Eux Tb1 - x) L3L′(其中 L 为邻氨基苯甲酸 ,L′为 2 ,2’-联吡啶 ) ;在 35 1nm紫外光激发下 ,研究了配合物的荧光光谱 ,结果表明 ,Eu3 的荧光发射被 Tb3 强烈敏化 ,而 Tb3 的荧光发射被 Eu3 离子强烈猝灭     

ZQAI12-8-3-2螺旋桨壳体裂纹补焊工艺研究

对ZQAI12-8-3-2螺旋桨壳体裂纹的成因进行了分析，并针对ZQAI12-8-3-2黄铜的特殊焊接特性，在焊前、焊接中和焊后提出了一些特殊的保护措施。     

某铀矿地浸浸出液主要组分计算及其关系分析

应用地球化学模式PHREEQC计算某铀矿淡化少试剂地浸新工艺现场试验浸出液的主要组分铀、碳酸衍生物的存在形式和条件。结果表明,H_2CO_3、HCo_3~-和CO_3_~(2-)是碳酸衍生物在水中主要存在形式,UO_2(CO_2)_2~(2-)、UO_2(CO_3)_3~(4-)、UO_2CO_3为六价铀的主要存在形式。讨论了中性条件下主要组分各种存在形式之间的转换、出铀浓度与碳酸衍生物之间的关系,揭示了地浸过程中水岩作用机理。     

GCr15轴承钢中非金属夹杂物的转变

采用气体分析法、化学分析法、扫描电镜-能谱分析法,对GCr15轴承钢生产过程中的非金属夹杂物进行了研究。工业试验表明,GCr15轴承钢在LF-VD工序夹杂物转变规律为Al2O3→MgO·Al2O3→Al2O3·xCaO·yMgO→MgO·Al2O3或MgO;利用CaO-MgO-Al2O3三元相图对渣系进行优化,适当提高炉渣的wCaO/wAl2O3,提高渣中CaO含量,降低渣中w(FeO+MnO)含量,利于实现最终夹杂物向低熔点区(θm≤1500℃)转变。     

差热法快速测定钢中氧化夹杂的初探

利用TC -4 3 6氮氧仪的程序升温功能 ,研究了一系列光谱纯氧化物试剂Fe2 O3,MnO2 ,NiO ,CuO ,SiO2 ,Al2 O3以及稀土氧化物La2 O3,CeO2 等的氧释放曲线 ;每种氧化物在给定条件下 ,以跟踪式升温方式受热释放氧 ,得到了分解温度、分解电流和分解功率。发现不同氧化物分解温度由低到高的顺序为 :CuO 相似文献   

Mechanism of Phase Transformation and Formation of Barium Hexaferrite Doped with Rare-Earths in Sol-Gel Process

The phase-transformation in sol-gel preparation of barium hexaferrite and the formation of barium hexaferrite doped with La3 ~ were studied by chemical phase analysis, X-ray diffraction and infrared spectrometry analysis. The experimental results show that phase transformation reactions of FeCO3, Fe2O3 and BaFe2O4, barium hexaferrite and γ-Fe2O3 take place in the heat treatment of gel. While the doping lanthanide ion replace barium ion, an equivalent quantity of Fe^3 are reduced to Fe^2 to maintain the eharge equilibrium.     

济钢350 m3高炉炉渣Al2O3波动原因分析

2007年2月份，济钢高炉炉渣中Al2O3的含量大幅度升高，影响到高炉的稳定顺行，运用六西格玛的数理统计分析方法，对表现最为突出的1^#350m，高炉相邻月份炉渣Al2O3的波动情况进行了分析，找出了影响高炉炉渣Al2O3的关键因素为燃料比和原料带入量，建立了高炉炉渣Al2O3分析公式并提出了控制目标模型。     

Validation of the three-dimensional acquisition mode in positron emission tomography for the quantitation of [18F]fluoro-DOPA uptake in the human striata

Three-dimensional (3D) positron emission tomography (PET) is attractive for [18F]fluoro-DOPA studies, since the sensitivity improvement is maximal for radioactive sources located in central planes, which is usually the case for the human striata. However, the image quantitation in that mode must be assessed because of the nearly threefold increase in scattered coincidences. We report the results of [18F]fluoro-DOPA studies performed on six normal volunteers. Each one was scanned in the 3D and two-dimensional (2D) modes on the same tomograph. The quantitation in the 3D and 2D modes was compared for a Patlak graphical analysis with the occipital counts as the input function (Ki) and a striatooccipital ratio analysis. We find that, in 3D PET, a scatter correction is required to preserve the same quantitation as in 2D PET. When the 3D data sets are corrected for scatter, the quantitation of the [18F]fluoro-DOPA uptake, using the Patlak analysis, is similar in the 2D and 3D acquisition modes. Conversely, analysis of the striatooccipital ratio leads to higher values in 3D PET because of a better in-plane resolution. Finally, using the 3D mode, the dose injected to the subjects can be reduced by a factor greater than 1.5 without any loss in accuracy compared to the 2D mode.     

CaO-SiO2-Al2O3-MgO夹杂物控制影响因素的多尺度结构

 对CaO-SiO2-Al2O3-MgO夹杂物熔点的影响因素进行了多尺度分析,利用Factsage模拟了CaO质量分数对CaO-SiO2-Al2O3-MgO夹杂物熔点的影响规律。多尺度分析表明,工位操作（101 m）影响夹杂物成分（10-10 m）的最后可控因素为钙线喂入量。其通过影响局部钢液中钙质量分数（100 m）来改善熔池的动力学条件（10-3 m）,改变夹杂物中CaO质量分数（10-10 m）。模拟结果表明,当CaO质量分数为30%时,CaO-SiO2-Al2O3-MgO相图中低熔点区域的比例达到最大。通过实例分析得到了夹杂物控制的工位级效应,表明了对钢液洁净度进行多尺度深入研究的可行性。     

铝土矿低钙石灰烧结过程热力学分析

通过对CaO-Al2O3、CaO-Al2O3-SiO2、CaO-SiO2、Al2O3-SiO2系的热力学分析,探讨铝土矿低钙石灰烧结过程中的热力学反应规律。结果表明,在烧结温度范围内(1 200～1 400℃),生成CaO.Al2O3和2CaO.Al2O3.SiO2的反应能发生,Al2O3可与SiO2生成Al2O3.SiO2。     

Association between obesity and high blood pressure: reporting bias related to gender and age

ErbB3 is a transmembrane signaling molecule that shares close structural homology with epidermal growth factor receptor (EGFR), erbB2, and erbB4. They have all been implicated in cell transformation and tumor pathogenesis, but very little is known about the role of erbB3 in normal colon and colorectal cancer. Therefore, in the current study, we determined whether erbB3 is found in normal human colon and whether its expression is altered in colorectal cancer. Because of some evidence that erbB3 might interact with erbB2 and EGFR, respectively, by heterodimerization, we also included erbB2 and EGFR analysis with special regard to coexpression. The study was performed on 35 patients operated on for colorectal carcinoma. The normal human colon showed weak erbB3 and erbB2 immunostaining, predominantly in surface epithelial cells. EGFR immunoreactivity in normal colon varied from weak to strong. In contrast, in 31 of 35 (89%) and in 29 of 35 (83%) colonic cancers, moderate to strong immunoreactivity for erbB3 and erbB2, respectively, was present in most epithelial cancer cells. A concomitant erbB3 and erbB2 immunostaining advantage could be found in 77% of cancerous tissues in comparison with the normal colon. No difference in EGFR immunostaining was evident between normal colon and cancer. Northern blot analysis showed an increase in erbB3 and erbB2 mRNA levels in 64% of cancers in comparison with normal colon samples. By densitometry, 2.3-fold and a 1.5-fold significant increases in erbB3 and erbB2 mRNA levels, respectively, were calculated in the cancerous tissues. Eighty-five percent of cancers with erbB3 mRNA overexpression showed an increase in erbB2 mRNA. Southern blot analysis did not indicate any gene amplification or rearrangement responsible for erbB2 or erbB3 overexpression. EGFR, however, was decreased in cancer on mRNA level. These findings indicate that erbB2 and erbB3, but not EGFR, may contribute to tumor growth and disease progression in colon cancer. The correlation between increased erbB2 and erbB3 expression in both Northern blots and immunohistochemical analysis suggests a co-overexpression of erbB2 and erbB3 and might support the hypothesis that these two growth factor receptors act together by heterodimer formation.     

Identification of ions present in LiF-DyF3 melts and the mechanism of Dy2O3 dissolution therein

Herein, the present paper were attempted to identify ions in LiF-DyF_3 melts according to the law of decreasing primary crystallization temperature and model analysis. Specifically.the primary crystallization temperatures of LiF-DyF_3 and LiF-DyF_3-Dy_2O_3 melts with various DyF_3 and Dy_2O_3 contents were determined by differential scanning calorimetry(DSC), and reactions occurring in the above melts were investigated using ideal dilute solution(Temkin and Flood) models. Moreover, crystal phases produced by rapid solidification of LiF-DyF_3, LiF-Dy_2O_3, DyF_3-Dy_2O_3, and LiF-DyF_3-Dy_2O_3 melts were identified by X-ray diffraction(XRD) analysis. The primary crystallization temperature of LiF-DyF_3 melts exhibits an approximately linear decrease with increasing molar fraction of DyF_3, and the general formula of complex ions in these melts is expressed as DyF_x~((3-x)),e.g., DyF_4~-. Finally, we investigated the dissolution of Dy_2O_3 in LiF-DyF_3 melts, showing that it was chemical in nature and afforded Dy_(1+x)O_(3x)F_(3-3x) and DyOF.     

Th(Ⅳ)和UO2(Ⅱ)与希夫碱的双核配合物的合成与表征

合成了硝酸钍、硝酸铀酰与希夫碱邻香兰素缩邻氨基苯甲酸（Ｈ２Ｌ表示）的两种新双核固体配合物,通过元素分析、红外光谱、紫外光谱、差热－热重及摩尔电导分析等方法,确定配合物的组成分别为「Ｔｈ２（ＨＬ）３（ＮＯ３）２」（ＮＯ３）３、「（ＵＯ２）２（ＨＬ）３」ＮＯ３,并对它们的某些性质进行了研究。