热声谐振管的实验研究

本文主要介绍作者热声谐振管研制方面的工作，作者成功地研制了热声谐振实验装置系统。     

均匀设计法在工作电解液配方试验中的应用

均匀设计是一种全新的试验设计方法，特别适合多因素、多水平的试验。详细论述了均匀设计法在配制高压１０５℃工作电解液上的具体应用。结果表明，均匀设计显著减少了试验工作量，克服了配方试验的盲目性，提高了试验效率     

不确定度表示的进展及其对实验教学的要求

以提纲形式综述、分析了近年来不确定度表示体系方面的研究进展和特点，提出物理实验教学中推广该体系的必要性、规范化要求及应注意的几个问题     

Association of probability measures on partially ordered spaces

A notion of association of probability measures on partially ordered (Polish) spaces is introduced and its basic properties are investigated. This generalizes the classical notion of association among random variables, due to Esary, Proschan, and Walkup. The relation between association and monotone stochastic kernels is investigated and a theorem of Jogdeo is generalized. The general theory is applied to stochastic processes with both discrete and continuous time parameter and partially ordered state spaces. Also, an application to mixtures of statistical experiments is included.     

Theoretical and experimental investigation of millimeter-wave TED's in cross-waveguide oscillators

Theoretical and experimental investigations of millimeterwave GaAs second harmonic transferred electron device (TED) oscillators using separate circuits for frequency and power optimization, are described. The theory predicts the oscillation frequency with less than 2% error for the second harmonic. Apart from the 2d and 3d, a 4'th harmonic from the TED was observed up to 130 GHz.     

Multiplicity-Selective Coherence Transfer Steps for the Design of Amino Acid-Selective Experiments-A Triple-Resonance Experiment Selective for Asn and Gln

A multiplicity-selective coherence transfer step is discussed, that can replace the normal INEPT transfer in triple-resonance experiments. Depending on the pulse sequence in which they are implemented, amino acid-selective experiments will be created. Two experiments selective for Asn and Gln are proposed.     

在普通物理实验教学中实施创新教育的思考与实践

文章从转变教学观念，革新教学内容，改革教学方法和成绩考核方法等方面，阐述了笔者对于在高等师范院校普通物理实验教学中实施创新教育的认识和实践情况。     

The Role of the Electron Transfer Stage in Reactions of Organo-sulfur Compounds and the Problem of Directed Influence on These Reactions

Abstract

The importance of the electron transfer stage for conversions of organo-sulfur compounds is demonstrated. The factors are analyzed allowing one to realize specific influence on these conversions, viz. to initiate the conversions by facilitating the stage associated with ion radical formation, to alter their direction by varying the solvent nature or the state of ionic aggregates. It is emphasized that the above mentioned ways to exert influence possess a rather general application. The bibliography contains 27 references.     

Sample size planning for classification models

In biospectroscopy, suitably annotated and statistically independent samples (e.g. patients, batches, etc.) for classifier training and testing are scarce and costly. Learning curves show the model performance as function of the training sample size and can help to determine the sample size needed to train good classifiers. However, building a good model is actually not enough: the performance must also be proven. We discuss learning curves for typical small sample size situations with 5–25 independent samples per class. Although the classification models achieve acceptable performance, the learning curve can be completely masked by the random testing uncertainty due to the equally limited test sample size. In consequence, we determine test sample sizes necessary to achieve reasonable precision in the validation and find that 75–100 samples will usually be needed to test a good but not perfect classifier. Such a data set will then allow refined sample size planning on the basis of the achieved performance. We also demonstrate how to calculate necessary sample sizes in order to show the superiority of one classifier over another: this often requires hundreds of statistically independent test samples or is even theoretically impossible. We demonstrate our findings with a data set of ca. 2550 Raman spectra of single cells (five classes: erythrocytes, leukocytes and three tumour cell lines BT-20, MCF-7 and OCI-AML3) as well as by an extensive simulation that allows precise determination of the actual performance of the models in question.     

Phase equilibria in binary systems containing N-monosubstituted amides and hydrocarbons

The binary vapour-liquid equilibrium of seven systems of -caprolactam + octane, + decane, + dodecane, octane, + decane, + dodecane, of N-methylacetamide + octane, of N-ethylacetamide of N-methylpropionamide + octane and of N-methylpropionamid + -caprolactam was measured in the temperature range from 363 to 423 K and in the low pressure region. A static equilibrium apparatus for the measurements was constructed.

In the system N-methylpropionamide + octane measurements of liquid-liquid equilibrium were carried out in the temperature range from 310 K up to the critical solution temperature.

The experimental results were correlated applying activity coefficients models such as NRTL. The data obtained from our measurements were used to estimate UNIFAC interaction parameters for the groups CH₂/CONHCH₂, CH₂/C₅H₁₀CONH and CONHCH₂/C₅H₁₀CONH.