K_2O－B_2O_3－SiO_2玻璃成分对析晶性能的影响

本文利用ＤＴＡ、ＸＲＤ、ＴＥＭ、ＳＥＭ等技术研究了三种Ｋ２Ｏ－Ｂ２Ｏ３－ＳｉＯ２玻璃的析晶性能。结果表明，Ｋ２Ｏ－Ｂ２Ｏ３－ＳｉＯ２玻璃的析晶由分相引起，分相和析晶能力受成分影响较大。随Ｂ２Ｏ３和Ｋ２Ｏ含量增多及Ｋ２Ｏ／Ｂ２Ｏ３比值的降低，析晶加强。析晶中主晶相类别尚未查清，次晶相确定为α－方石英。     

K2O—B2O3—SiO2玻璃成分对析晶性能的影响

本文利用ＤＴＡ、ＸＲＤ、ＴＥＭ、ＳＥＭ等技术研究了三种Ｋ２Ｏ－Ｂ２Ｏ３－ＳｉＯ２玻璃的析晶性能。结果表明，Ｋ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２玻璃的析晶由分相引起，分相和析昌能力受成分影响较大，随Ｂ２Ｏ３和Ｋ２Ｏ含量增多及Ｋ２Ｏ／Ｂ２Ｏ３比值的降低，析晶加强，析晶主晶相类别尚未查清，次晶相确定为α－方石英。     

NaOH-KOH熔盐中合成BaTiO3反应过程电导率的变化

用交流阻抗谱法测量了３５０℃时共晶成分的ＮａＯＨ－ＫＯＨ熔盐中加入ＴｉＯ_２和ＢａＣＯ₃时体系电导率的变化,准确给出了３５０℃共晶成分ＮａＯＨ－ＫＯＨ熔盐的电导率为１．０５３Ω－１·ｃｍ^－１,确认了在ＮａＯＨ－ＫＯＨ熔盐中ＴｉＯ_２与ＢａＣＯ_３反应,生成ＢａＴｉＯ_３时熔盐不参与反应．实验数据表明３５０℃ＴｉＯ_２与ＢａＣＯ_３在共晶成分的ＮａＯＨ－ＫＯＨ熔盐中的溶解过程可在短时间内达到平衡．     

八种新功能晶体的比热及其与相变掺杂物关系的实验研究

本文对八种新型功能晶体Ｌｉ２Ｂ４Ｏ７、Ｂｉ１２ＴｉＯ２０、Ｂｉ１２ＧｅＯ２０、Ｂｉ１２ＧｅＯ２０、Ｂｉ４Ｇｅ３Ｏ１２、Ｓｒ１－ｘＢａｘＮｂ２Ｏ６（ｘ＝０．３３，０．４８）、ＬｉＴａＯ３等在１３０～９７３Ｋ范围内的比热行为及其与相变、组分之间的关系进行了实验研究，给出了比热的多项式拟合方程，并与用纽曼－卡普定律及用Ｗｉｋｅｌｍａｎｎ经验方程的比热计算值作了对比，为晶体比热的估算提供了依据和方法。     

过硫酸钾—脲氧化还原引发的甲基丙烯酸乙酯基三甲基氯化铵反…

研究了以ｓｐａｎ－８０为乳化剂和过硫酸钾－脲引发体系下，甲基丙烯酸乙酯基三甲基氯化铵反相乳液聚合的动力学，得出在「Ｋ２Ｓ２Ｏ８」为１２．３－７３．８μｍｏｌ．Ｌ＾－１．「ＣＯ（ＮＨ２）２」ｏ为０－０．９５ｍｍｏｌＬ＾－１，乳化剂为４１．７５－６６．８０ｇ．Ｌ＾－１范围内的聚合速率表达式：Ｒｐ＾∞「ＤＭ．ＭＣ」＾１．７１「Ｋ２Ｓ２Ｏ８」＾０．２８「ＣＯ（ＮＨ２）２」＾０．０１「３」＾－１．１８，ＢＣ     

高温下H2O—N2,H2O—H2O混合气体中H2O分子谱线的半宽度

本文用ＩＯＳ方法和我们改进的Ｂｕｃｋｉｎｇｈａｍ势计算了Ｈ２Ｏ－Ｎ２，Ｈ２Ｏ－Ｈ２Ｏ混合气体中Ｈ２Ｏ分子谱线在高温下（６００Ｋ，９００Ｋ，１２００Ｋ，１５００Ｋ）的压力加宽半宽度。分析了谱线半宽度随温度变化的规律，同时也讨论了半宽度与加宽和补加宽分子大小的关系。     

Ba1—xKxBiO3超导材料研究进展

介绍了Ｂａ１－ｘＫｘＢｉＯ３超导体多晶、单晶和薄膜材料制备和应用研究方面的进展。     

TiC对C—SiC—B4C复合材料氧化行为的影响

研究了ＴｉＣ的添加对Ｃ－ＳｉＣ－Ｂ４Ｃ复合材料氧化行为的影响，实验发现１５７３Ｋ处理的Ｃ－ＳｉＣ－Ｂ４Ｃ复合材料的抗氧化性能优于未加ＴｉＣ的复合材料，氧化失重随着ＴｉＣ添加量的增大而减小；更高温度处理的Ｃ－ＳｉＣ－Ｂ４Ｃ复合材料在低温氧化时表现为少量增重，１１００Ｋ以下基本无失重，而高温氧化速率则有所增加，特别是２６７３Ｋ处理的复合材料的最终氧化失重是１５７３Ｋ处理复合材料失重的６倍，失重主要发生在１２００～１４００Ｋ。Ｘ射线衍射发现，高温处理使复合材料中的Ｂ４Ｃ与ＴｉＣ发生反应生成ＴｉＢ２，减缓了Ｂ４Ｃ的氧化速率，使之在１１００～１４００Ｋ不能产生足够的液相Ｂ２Ｏ３，没有起到有效封闭炭材料裸露面而阻止氧的扩散的作用。１４００Ｋ以上的氧化失重速率受热处理温度的影响不大，主要是由于生成的ＴｉＢ２大量氧化，生成Ｂ２Ｏ３液相，以及ＳｉＣ大量氧化生成ＳｉＯ２，从而对复合材料起到保护作用。ＳＥＭ形貌观察与上述结论一致。     

演绎的面向对象数据库(DOOD)研究

介绍了在演绎库（ＫＢＡＳＥ－Ｐ）与对象库（ＦＯＯＤＢ）基础上实现的一个演绎的面向对象数据库系统（ＤＯＯＤ），系统支持对象的递归查询等操作，还引入了ＩＯＤＢ与ＤＯＤＢ等概念，用于演绎对象的生成。系统采用Ｏ－ＤＡＴＡＬＯＧ语言，用于实现对象间的演绎，并继承了演绎库的优化策略。     

MSnO3和MSn0.5Zr0.5O3（M=Sr,Ba）的水热合成

本文利用水热合成方法对ＭＳｎＯ３和ＭＳｎ０．５Ｚｒ０．５（Ｍ＝Ｓｒ，Ｂａ）的合成进行了研究，并采用ＸＲＤ、ＳＥ几ＩＣＰ等进行产物进行了表征，结果表明：在Ｍ（ＯＨ）２．ＳｎＯ２（呈ＳｎＯ２＋ＺｒＯ２）－ＫＯＨ体系中，当ＫＯＨ／Ｓｎ和ＫＯＨ（Ｓｎ＋Ｚｒ）≥３０时，２６０℃下晶化５－７天，可获得ＭＳｎＯ３和ＭＳｎ０．５Ｏ３纯相，在Ｍ（ＯＨ）３－（ＳｎＯ２＋ＺｒＯ３）－ＫＯＨ－Ｈ２Ｏ体系中，可通过控制介质     

Nd3+:Gd3Ga5O12晶体的热物理性能研究

提拉法生长了Nd^3＋：Gd3Ga5O12（Nd：GGG）单晶，用差示扫描量热法（DSC）和激光脉冲法分别测量了Nd：GGG激光晶体的比热和热扩散系数，计算得到晶体的导热系数，与用PPMS测量得到的导热系数相吻合．实验结果表明：Nd：GGG激光晶体具有较大的比热和导热系数，具有良好的热物理性能；Nd：GGG晶体的热扩散系数和导热系数随着温度的升高而减小；计算得到晶体的德拜温度为711K．     

The Thermal Conductivity, Thermal Diffusivity, and Specific Heat of Liquid n-Pentane

The thermal conductivity and thermal diffusivity of liquid n-pentane have been measured over the temperature range from 293 to 428 K at pressures from 3.5 to 35 MPa using a transient hot-wire instrument. It was determined that the results were influenced by fluid thermal radiation, and a new expression for this effect is presented. The uncertainty of the experimental results is estimated to be better than ±0.5% for thermal conductivity and ±2% for thermal diffusivity. The results, corrected for fluid thermal radiation, are correlated as functions of temperature and density with a maximum uncertainty of ±2% for thermal conductivity and ±4% for thermal diffusivity. Derived values of the isobaric specific heat are also given.     

Photopyroelectric Determination of the Order of Liquid Crystal Phase Transitions

The photopyroelectric technique has been used to measure simultaneously the specific heat, the thermal conductivity, and the thermal diffusivity of 9CB liquid crystal in the temperature range 35 to 60°C, where the sample undergoes a weakly first-order phase transition and a second-order one. Measurements of the anisotropy of the thermal conductivity have also been performed, and the data have been used to establish the order of the above-mentioned phase transitions. Pretransitional effects in the isotropic phase in the thermal diffusivity have been found, and they have been associated with similar effects reported for the specific heat.     

Investigation of thermal conductivity and thermal diffusivity of liquid bismuth within the temperature range of 545–970 K

Thermal conductivity and thermal diffusivity of liquid bismuth within the temperature range from 545 K up to 970 K are investigated by the laser flash method. The measurement errors are equal to (3.5–4.5)%. Approximating equations are obtained, and the reference tables are presented for the temperature dependencies of the properties. The measurement results are compared to the published data available. The temperature dependence of the Lorentz number is calculated up to 970 K.     

Ca2YO(BO3)3晶体的热物理性质研究

测量了新型非线性激光晶体Ca2YO(BO3)3（YCOB）的比热及其沿a,b,c三个方向的热膨胀系数，热扩散系数，导热系数，声子平均自由程和等效声速等热物理性质；讨论了属于单斜晶系的YCOB晶体的热物性的各向异性行为；实验结果表明YCOB晶体具有较大的比热和导热系数，其热膨胀系数各向异性相对较小，具有良好的热物理和力学性能。     

Thermal Conductivity,Thermal Diffusivity,and Heat Capacity of Gaseous Argon and Nitrogen

Low-pressure thermal conductivity and thermal diffusivity measurements are reported for argon and nitrogen in the temperature range from 295 to 350 K at pressures from 0.34 to 6.9 MPa using an absolute transient hot-wire instrument. Thermal conductivity measurements were also made with the same instrument in its steady-state mode of operation. The measurements are estimated to have an uncertainty of 1% for the transient thermal conductivity, 3% for the steady-state thermal conductivity, and 4% for thermal diffusivity. The values of isobaric specific heat, derived from the measured thermal conductivity and thermal diffusivity, are considered accurate to 5% although this is dependent upon the uncertainty of the equation of state utilized.Paper presented at the Sixteenth European Conference on Thermophysical Properties, September 1–4, 2002, London, United Kingdom     

The Thermal Conductivity, Thermal Diffusivity, and Heat Capacity of Gaseous Argon

This paper presents new absolute measurements for the thermal conductivity and thermal diffusivity of gaseous argon obtained with a transient hot-wire instrument. Six isotherms were measured in the supercritical dense gas at temperatures between 296 and 423 K and pressures up to 61 MPa. A new analysis for the influence of temperature-dependent properties and residual bridge unbalance is used to obtain the thermal conductivity with an uncertainty of less than 1% and the thermal diffusivity with an uncertainty of less than 4%. Isobaric heat capacity results were derived from measured values of thermal conductivity and thermal diffusivity using a density calculated from an equation of state. The heat capacities presented here have a nominal uncertainty of 4% and demonstrate that this property can be obtained successfully with the transient hot wire technique over a wide range of fluid states. The technique will be useful when applied to fluids which lack specific heat data.     

The Thermal Conductivity, Thermal Diffusivity and Isobaric Heat Capacity of Toluene and Argon

This paper presents absolute measurements for the thermal conductivity and thermal diffusivity of toluene obtained with a transient hot-wire instrument employing coated wires over the density interval of 735 to 870 kgm^–3. A new expression for the influence of the wire coating is presented, and an examination of the importance of a nonuniform wire radius is verified with measurements on argon from 296 to 323 K at pressures to 61 MPa. Four isotherms were measured in toluene between 296 and 423 K at pressures to 35 MPa. The measurements have an uncertainty of less than ±0.5% for thermal conductivity and ±2% for thermal diffusivity. Isobaric heat capacity results, derived from the measured values of thermal conductivity and thermal diffusivity, using a density determined from an equation of state, have an uncertainty of ±3% after taking into account the uncertainty of the applied equation of state. The measurements demonstrate that isobaric specific heat determinations can be obtained successfully with the transient hot wire technique over a wide range of fluid states provided density values are available.     

Thermophysical Properties of Porous Sandstones: Measurements and Comparative Study of Some Representative Thermal Conductivity Models

The thermal conductivity and thermal diffusivity of porous consolidated sandstones have been measured simultaneously by the transient-plane source (TPS) technique in the temperature range from 280 to 330 K at ambient pressure using air as the saturant. The porosity and density parameters are measured using standard American Society for Testing and Materials (ASTM) methods at 307 ± 1 K. Data are presented for five types of samples ranging in porosity from 8 to 17 vol. %, taken from various positions above the baseline. The thermal conductivity and constituents of the minerals vary with porosity as well as with the position of the sample from the baseline. The thermal conductivity data are discussed in the framework of simple mixing laws and empirical models. Simple correlations between the effective density and porosity, and between the effective thermal conductivity and porosity, are also established     

锗酸铋（Bi4Ge3O12）单晶热物理性质的研究

本文用不同的测试技术和方法测定了锗酸铋(BGO)单晶的比热(300～800K)热膨胀系数(100～1100K)和导温系数(140～700K),进而导出了 BGO 单晶不同温度下的导热系数、定容比热、德拜温度和格虑内森数。本文还对 BGO 单晶热物理性质的变化规律作了理论解释。