Fattening complex manifolds: Curvature and Kodaira—Spencer maps

We present a calculus whereby the curvature of a geometry arising from any generalized twistor correspondence is related to an obstruction-theoretic classification of the infinitesimal neighborhoods of submanifolds of its twistor space. The crux of the argument involves a relation between Kodaira—Spencer maps and the Penrose transform.     

Response of Laser Diffraction Particle Sizer to Anisometric Particles

This study deals with the size measurement of non-spherical particles by the laser diffraction technique. Size analyses of three sets of identical metallic bodies (cubes, tablets and cylinders) were performed by means of a Malvern 2600 instrument. The results prove that under the operating conditions chosen and in the case of anisometric objects, the mean total surface area is not measurable either because the Malvern software, strictly valid for spheres, is not applicable to such particles or because the particles adopt preferential orientations in the measurement cell. Further, a way of processing diffraction data is proposed in order to determine two characteristic dimensions of identical anisometric particles. It is based on the measurement of the minimum and maximum projected surface areas of the particles. The experimental results obtained with our particles show the procedure to be reliable.     

A New Condition and Applications in Fourier Analysis (Ⅱ)

Aswealreadymentionedin[6],inFourieranalysis,sinceFouriercoefficientsarecomputableandapplicable,peoplehaveestablishedmanyniceresultsbyassumingmonotonictyofthecoefficients.Generallyspeaking,itbecameanimportanttopichowtogeneralizemonotonicity.Inmanystudiesthegeneralizationfollowsbythisway:(coefficients)nonincreasing(？)quasimonotone(？)regularlyvaryingquasimonotone(？)O-regularlyvaryingquasimonotone     

Generalized Pearson Distributions and Related Characterization Problems

This paper is concerned with a Rodrigues' formula for generating new classes of polynomials. The associated density functions belong to the family of generalized Pearson curves, which extends the classical Pearson family. Various properties of these polynomials (degree, orthogonality ...) are investigated and then exploited to derive several related results, especially characterizations, in probability.     

Thermochemistry of natural hypersaline water systems using the Dead Sea as a case

In order to study the heat effect of mixing of fresh waters (winter rains in the form of floods) with Dead Sea water, the heats of mixing of Dead Sea water with distilled water at 25°C have been measured. On the basis of these experimental data, the heats of dilution of fresh water in Dead Sea water and Dead Sea water in fresh water have been calculated. By considering the isothermal cycle of the dilution of Dead Sea water, the partial heat of evaporation of water from Dead Sea water was found to be ca. 24585 kJ-(kgH₂O)^–1 at 25°C.     

Synthesis of Reactive Intermediates for Natural Cyclopentane Derivatives from (−)-Quinic Acid: Preparation of 11α-hydroxy-13-oxaprostanoic acid

We describe a flexible, stereocontrolled synthesis of enantiomerically pure substituted cyclopentenes and cyclopentanes - including 11α-hydroxy-13-oxaprostanoic acid 20 - (?)-quinic acid via an acyclic precursor 6 by an intramolecular aldolisation-dehydration reaction.     

多次改变聚焦强度法测量束流发射度

就“多次改变聚焦强度法测量束流发射度”,讨论了测量技术和测量装置的优化,包括薄透镜近似的合理采用,多点最小二乘拟合,截面测量靶轴向位置的优化选择,和测量软件系统的改进等,以提高发射度测量的准确性和可靠性.已将上述优化技术,应用于BEPC直线加速器上新建和改建的发射度测量装置,获得了满意的测量结果