配合物[Fe(bipy)2]3+修饰的MCM-41的合成与表征

以γ－氨丙基修饰介孔分子筛ＭＣＭ－４１内孔壁,将引入的γ－氨丙基与金属配位离子「Ｆｅ（ｂｉｐｙ）２」＾３＋通过配位键首次合成了金属配位化合物修饰的ＭＣＭ－４１（ＭＣＭ－ａｐ－Ｆｅ（ｂｉｐｙ）２）。通过ＸＲＤ,７７Ｋ氮气吸附－脱附曲线,固体ＵＶ－ｖｉｓ漫反射光谱和循环伏安曲线表征了复合物ＭＣＭ－ａｐ－Ｆｅ（ｂｉｐｙ）２。由于「Ｆｅ（ｂｉｐｙ）２」＾３＋的引入,使ＭＣＭ－ａｐ－Ｆｅ（ｂｉｐｙ）２的结晶     

预变形温度对Fe—Mn—Si—Ni—Cr合金形状记忆效应及γ←→ε转变的影响

研究了不同预变形温度下Ｆｅ－２５Ｍｎ－４Ｓｉ－２Ｎｉ－Ｃｒ合金的形状记忆效应和γ←→转变。结果表明，在２０３Ｋ进行预变形可以获得最大形状恢复率；适当降低预变形温度有利于应国诱发马氏体转变和形状忘儿应；但在７７Ｋ进行６％的预变形会使ε马氏体交割处产生全位错，不利于逆转变和形状记忆效应。     

NiAl（Fe）合金组织和拉伸性能的研究

采用光学显微镜、扫描电镜（ＳＥＭ）、透射电镜（ＴＥＭ）、电子探针（ＥＰＭＡ）、Ｘ射线（ＸＲＤ）和选区电子衍射分析（ＳＡＥＤ）研究了ＮｉＡｌ（Ｆｅ）合金的显微组织及拉伸性能。结果表明，铸态ＮｉＡｌ（Ｆｅ）合金经均匀化退火后的组织由β及β＋γ＇相组成。韧性相γ＇相能阻止裂纹扩展，有利于改善合金的室温塑性。比较发现，Ｎｉ５０Ａｌ２０Ｆｅ３０合金具有最佳的室温塑性，其拉伸断口由β相的解理断口和β＋γ＇相的     

HK40耐热钢凝固过程的研究

利用液淬－金相法研究了ＨＫ４０耐热钢的凝固过程，结果表明，ＨＫ４０钢的固相线和液相线温度分别为１４０６℃和１１９０℃，并在１３００℃时开始析出γ＋碳化物共晶，且共晶形态与熔池形态有关，ＴＥＭ分析结果表明该碳化物共晶为γ＋Ｍ７Ｃ３。ＤＴＡ结果与等温凝固结果基本一致。     

凝固速率对DZ22合金力学性能和组织的影响EI

本文采用ＺＭＬＭＣ超高梯度定向凝固法（ＺＭＬＭＣ法），研究了两种凝固速率下ＤＺ２２合金的高温力学性能和组织。结果表明，较高凝固速率下大幅度地提高了合金的高温力学性能，９８０℃，２２０ＭＰａ条件下的高温持久寿命由７１ｈ５０ｍｉｎ提高到１６８ｈ５ｍｉｎ；一次、二次枝晶臂间距λ＿１和λ＿２分别由１０５μｍ和３２．７μｍ左右减小到６８μｍ和１６μｍ左右；元素的枝晶偏析得到抑制；合金显微组织的组成相γ＇、（γ－γ＇）共晶、ＭＣ型碳化物的形态、大小和分布均发生了明显的变化。     

配合物[Mn(phen)_2]~(2 )修饰的MCM-41的合成与表征

分别以γ－氨丙基和甲基丙烯酸丙酯基修饰介孔分子筛ＭＣＭ－４１内孔壁,将引入的有机官能团与金属配位离子［Ｍｎ（ｐｈｅｎ）２Ｃｌ］＋通过配位健成键首次合成了锰（Ⅱ）配位化合物修饰的ＭＣＭ－４１（ＭＣＭ－ａｐ－Ｍｎ（ｐｈｅｎ）２,ＭＣＭ－ｍｐ－Ｍｎ（Ｐｈｅｎ）２）．通过ＸＲＤ、ＦＴＩＲ、７７Ｋ氮气吸附－脱附、ＵＶ－ＶＩＳ漫反射光谱和Ｍｎ２＋电子顺磁共振谱（ＥＳＲ）表征了复合物ＭＣＭ－ａｐ－Ｍｎ（ｐｈｅｎ）２和ＭＣＭ－ｍｐ－Ｍｎ（ｐｈｅｎ）２由于有机基团对ＭＣＭ－４１孔壁的修饰,使复合物的结晶度降低,增加的有机基因和配合物使红外光谱有所改变;ＢＥＴ比表面积,孔容和最可几孔径均下降;γ－氨丙基或甲基丙烯酸丙酯基与Ｍｎ２＋的配位而使其ＵＶ－ＶＩＳ漫反射吸收光谱在短波长的吸收加强;室温下 Ｍｎ２＋电子顺磁共振表明 Ｍｎ（Ⅱ）配位环境几乎没有变化．     

快速凝固Ml（NiCoMnTi）5击剑锪组织结构与电化学性能

本文对比研究了快速凝固和常规熔铸Ｍｌ（ＮｉＣｏＭｎＴｉ）５合金的组织结构和电化学性能。ＳＥＭ和ＸＲＤ分析研究表明,冷却速度较慢的常规熔铸合金为粗大的树枝晶组织,合金中Ｍｎ偏析明显,并且有少量ＴｉＮｉ３第二相组成。但在冷却速度高达１０＾５－１０＾６Ｋｓ＾－１快速凝固条件下,合金的组织转变为细小的柱状晶,合金呈ＣａＣｕ相结构,并使Ｍｎ的成分偏析得到抑制。     

配合物[Fe(bipy)2]3+修饰的MCM-41的合成与表征

以γ－氨丙基修饰介孔分子筛ＭＣＭ－４１内孔壁,将引入的γ－氨丙基与金属配位离子［Ｆｅ（ｂｉｐｙ）_２］^３＋通过配位键首次合成了金属配位化合物修饰的ＭＣＭ－４１（ＭＣＭ－ａｐ－Ｆｅ（ｂｉｐｙ）_２）．通过ＸＲＤ,７７Ｋ氮气吸附－脱附曲线,固体ＵＶ－ｖｉｓ漫反射光谱和循环伏安曲线表征了复合物ＭＣＭ－ａｐ－Ｆｅ（ｂｉｐｙ）_２。由于［Ｆｅ（ｂｉｐｙ）_２］^３＋的引入,使 ＭＣＭ－ａｐ－Ｆｅ（ｂｉｐｙ）_２的结晶度降低, ＢＥＴ比表面积、孔容和最可几孔径急剧下降．γ－氨丙基与Ｆｅ^３＋的配位而使其ＵＶ－ｖｉｓ漫反射吸收光谱与ＭＣＭ－Ｆｅ（ｂｉｐｙ）_２不同;循环伏安特性曲线表明ＭＣＭ－ａｐ－Ｆｅ（ｂｉｐｙ）_２在电化学上比浸渍法制备的ＭＣＭ－Ｆｅ（ｂｉｐｙ）_２稳定．     

Ti—33Al—3Cr—0.5Mo合金非平衡组织转变

采用光学金相显微镜和透射电子显微镜，研究了经过１０４０℃，３１０＾４Ｓ＾－１，８２６％等温锻造的６ｉ－３３Ａｌ－３Ｃｒ－０．５Ｍｏ合金在α＋β两相区加热时，发生的显微组织转变。发现，当热变形是在α２／γ层片状晶团内的γ相板条上形成与层片方面平行的变形享晶时，即发生γ相板条窄化现象，这种晶财则表现出高的显微组织结构的热稳定性。     

稀土元素Ce对Mn-Cu合金阻尼性能的影响

对用稀土Ｃｅ 改性的高阻尼Ｍｎ Ｃｕ 合金的阻尼性能与微观组织进行了研究。结果表明,添加稀土元素Ｃｅ,不仅能显著提高Ｍｎ Ｃｕ 合金的阻尼性能,而且能缩短达到峰值阻尼性能的时效时间,同时还抑制了过时效时阻尼性能的下降。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

卧式金属罐容量的测量结果不确定度

本文根据多年的实践检定经验 ,参照JJF1 0 59- 1 999《测量不确定度评定与表示》以及《测量不确定度表达 1 0讲》 ,对卧式金属罐容量的测量结果不确定度进行了评定。     

盐酸浓度不确定度的评估

通过对盐酸浓度标定的过程分析，找出影响结果的各个分量，进行不确定度的评定，按照计量技术规范给出标准的表示法。     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。