Structural evidence for fast-ion conduction in the silver and copper halides at high temperatures and pressures

The results of recent powder neutron diffraction investigations of the high pressure and high temperature phases within the binary Cu and Ag halides are summarised, with emphasis on the relationship between the observed structural disorder and evidence for fast-ion behaviour provided by other techniques such as ionic conductivity measurements, differential thermal analysis and molecular dynamics simulations. Paper presented at the 4th Euroconference on Solid State Ionics, Renvyle, Galway, Ireland, Sept. 13–19, 1997     

Densitometric quantitation of neutral lipids on ammonium sulfate impregnated thin-layer chromatograms.

A procedure is described which extends the densitometric quantitation of phospholipids on ammonium sulfate impregnated thin-layer chromatograms by Gluck et al. to include total lipid, free and esterified cholesterol, free fatty acid and triglyceride. Lipids separated on thin-layer plates containing silica gel G impregnated with ammonium sulfate were charred upon heating and absorbance was measured densitometrically. Thus, the necessity of spraying or submersing in a charring agent was eliminated, uniform charring became possible, and quantitation over a wider range of sample sizes than most densitometric procedures was obtained. One linear relationship existed for concentrations of standards over the range of 0.0-3.0 mug and another line from 4.0-50.0 mug. Both accuracy and precision of the method were highly reliable.     

Contemporary carbon-14 in lemongrass oil

Liquid scintillation counting ofp- cymene, derived from lemongrass oil, has provided information on the world-wide increase in C¹⁴ since 1954. By June 1959, the activity in the tropospheric atmosphere and in the rapidly equilibrating biosphere is measured to have increased by 26·8 per cent in the northern hemisphere and 19·7 per cent in the southern hemisphere. The shape of the relationship between activity and time is essentially linear, with two sections of quite different slope.     

相对论性核碰撞中φ介子增强

用强子和弦级联模型LUCIAE系统地研究了相对论性p+p和Pb+Pb碰撞中φ介子产生.在模型框架内实验测得的158AGeV/cPb+Pb碰撞中φ介子产额相对于同能量p+p碰撞的增强现象,依赖于弦发射胶子的集体效应和奇异夸克压低约化两机制,在一定程度内能得到解释.     

Size and Velocity Measurements of Large Drops in Air and in a liquid-liquid two-phase flow by the phase-Doppler technique

Particles comparable in size to or larger than the measurement volume need extra consideration when measured by a phase-Doppler system. The phase of the Doppler burst received when such particles traverse the measurement volume depends not only on the size of the particle but also on its trajectory, since the particle is not uniformly illuminated. This paper presents a strategy for securing correct measurements even under such conditions, taking advantage of the three-detector receiving optics of the Dantec Particle Dynamics Analyzer. The effectiveness of the approach is demonstrated for sizing drops in liquid-gas and liquid-liquid two-phase flows: water drops in air, water drops in FC72 and FC72 drops in water. The combination of water and FC72 is also of interest because the relative refractive index is close to unity. Measurements of drops size were made on a monodisperse stream of drops about 2 mm in diameter, i.e. substantially larger than the measurement volume, and polydisperse distributions of drops ranging in diameter from below 0.2 mm to about 1 mm.     

在RHIC的极限碎裂和Ф介子产生(英文)

利用强子和串级联模型LUCIAE研究了PHOBOS的极限碎裂等以及在PHIC进行的Au +Au碰撞中带电粒子多重性的经验标度规律 .对介子的产生机制也通过与带电粒子多重性的比较进行类似的研究 .结果似乎表明在串级碎裂模型中带电粒子和介子有共同的产生机制 .还讨论了PHOBOS经验标度规律的模型依赖性 .     

Preparation of iodic acid by direct oxidation of iodine with perchloric acid dihydrate

Iodine is quantitatively oxidised to iodic acid by boiling with 70% perchloric acid and the iodic acid is isolated by cooling, filtering off the precipitated crystals, and washing them with concentrated nitric acid. The over-all stoichiometry of the reaction is one molecule of perchloric acid per atom of iodine.     

Determination of the amine content of chitosan by pyrolysis-gas chromatography

Pyrolysis-gas chromatography-mass spectrometry has been applied to the study of N-acetyl-d-glucosamine, chitin and chitosans of varying degrees of deacetylation prepared from chitin. An examination of the pyrograms of samples of chitosan revealed that there is a direct correlation between the amine content and the ratio of the areas of the peaks derived from the glucosamine and N-acety-d-glucosamine moieties.     

An optoelectronic recirculating sorter based on CMOS/vertical cavity surface emitting laser smart pixel arrays; architecture and system demonstration

The architecture of an optoelectronic recirculating sorter based on the hybrid integration of CMOS logic circuitry, silicon detector/receivers and vertical cavity surface emitting lasers is presented along with the demonstration of the system.