用发光测定法研究溴碘化银混晶的生成

为获得高感照相材料,一般不采用溴化银乳剂,而采用溴碘化银乳剂。但是,微晶内部或微晶之间碘化银分布状况却因加碱金属碘的方法及晶体生成条件的不同而不同。这一因素也决定着乳剂的照相性能。本文阐述在已形成的大小不同的碘化银晶核上,溴化银结晶过程各阶段发光光谱的变化。目的是研究双注法中,用两种不同的加碘方法生成溴碘化银混晶的动力学和机理。大家知道,碘化银、溴化银和溴碘化银     

卤化银微晶的外形对被吸附增感染料吸收光谱的影响

溴碘化银的立方体和八面体微晶对化学成熟硫增感的动力学不同(图1)。两种微晶化学成熟拓扑反应的表观活化能也有显著的区别(图2)。因此,乳剂微晶的外形是乳剂最重要的特性之一。     

新型感红增感染料的应用研究

论述了一种新型感红增感染料在溴碘化银乳剂中的增感效果，以及与其它感红增感剂组合应用时所具有的明显超增感作用。     

国外文摘

照相乳剂化学增感对影像增强的影响——采用染料形成催化的方法161～165本文主要研究照相乳剂化学增感用染料组成催化,尤其对含银少的材料的画面增强有效果。研究了三种化学增感作用类型即还原、金及硫增感作用,指出化学增感类型对染料形成催化过程有明显的影响,而且还原和金增感增感类型对染料形成催化过程有时显的影响,而且还原和金增感增强了此过程的效应。、二_。扮照相材料解象力翻定做脸徽确性的研究 4.解象力用平均协蠢橄协的旅攀 Be二及卿,顽凡认,     

JG系列减感染料在卤化银感光乳剂中的应用

本文研究了JG系列减感染料在卤化银感光乳剂中的应用。对JG系列减感染料减感性能进行了测定，发现加入了JG系列减感染料的乳剂具有较强的减感作用。测定了JG系列减感染料对卤化银乳剂照相性能的影响，结果表明JG系列减感染料对氯溴乳剂的照相性能无不良影响。     

铱盐掺杂对卤化银乳剂照相性能的影响

本文阐述了一项用铱盐对溴碘化银T颗粒乳剂的增感实验研究，实验结果说明，在卤化银颗粒内部形成的铱增感感光中心，捕获光电子后在颗粒内部形成潜影，因而会降低感光度，而颗粒表面形成的铱增感感光中心能形成表面潜影，从而提高乳剂感光度。     

碘化钾在溴化银晶体生长中的作用

本文通过在乳化过程中对碘化钾加入位置的调整研究了碘化钾对颗粒形态比以及照相性能的影响,得出了随着碘化钾在溴碘化银晶体的外移,晶体的形态比逐渐增大,并且在一定形态比的范围内乳剂的感光度随着颗粒的增大而增加的结论。     

光谱增感剂和超增感剂(2)

增感染料的光谱增感作用在增感染料加入照相乳剂后,扩大感光范围,并使乳剂的总感光度提高的光谱增感过程,是一个光化学反应过程。和其他光化学反应一样它是由所吸收的光引起的。增感染料把对某波段光吸收的光能通过一定方式传递给照相乳剂的卤化银颗粒,使卤化银在原     

6-硝基苯并咪唑与苯并三氮唑的显影抑制机理

引言补加至乳剂及显影剂的苯并三氮唑(BTZ)对显影的抑制作用过去曾研究过。苯并三氮唑,在显影剂溶解力较低的情况下,对于以氯溴化银为主的乳剂乃是一种有效的显影抑制剂,但对各种化学增感之溴碘化银乳剂却并没有显影抑制作用。这     

氧-硫代海因份菁染料合成

一、前言氧-硫代海因份菁染料属于感绿增感染料,其乙醇溶液的最大吸收光谱位于480—515毫微米之间。它们在氯溴化银或溴碘化银乳剂中的增感极大值在535—550毫微米范围之内。氧-硫代海因份菁染料的结构通式如下:     

Super-sensitization mechanism of T-Grain AgBrI emulsion sensitized by an anionic−cationic cyanine dye

The transient time-resolved fluorescence decay spectrum of J-aggregates of an anionic−cationic cyanine dye adsorbed on tabular AgBrI nanocrystals has been investigated using femtosecond fluorescence up-conversion technology. The kinetics of the super-sensitization of the anionic−cationic cyanine dye is discussed in detail. The J-aggregates of the anionic−cationic cyanine dye have two excited states. Thus, more electrons are transferred from the excited states of the anionic−cationic cyanine dye to the conduction band of T-grain AgBrI. It is shown that the cations and anions in the anionic−cationic cyanine dye give rise to reciprocal super-sensitization effects in the red and green regions respectively.     

不同粒度板状刚玉对矾土基喷涂料性能的影响

以铝矾土为主要原料,铝酸钙水泥、硅微粉为粘合剂,分别研究不同粒度板状刚玉对矾土基喷涂料性能的影响。试样自然干燥24 h脱模后,再经110℃烘干24 h,分别于1 000、1 300、1 500℃热处理3 h,检测各温度热处理后试样的线变化率、体积密度、抗折强度、抗压强度以及试样的热膨胀系数、耐磨性能和抗热震性能。结果表明:经过1 300、1 500℃热处理后,试样的线收缩率随着板状刚玉粒度的减小而增大。此时,含有粒度小于45μm板状刚玉试样的抗折强度和抗压强度最大;经过1 300℃热处理后,细粒度的板状刚玉有利于提高试样的耐磨性能;含有粗粒度板状刚玉试样的抗热震性能优于含有细粒度板状刚玉试样的抗热震性能。     

Cooperative sensitization by reduction and chemical sensitization in AgX core–shell emulsions

Abstract

Cubic core–shell AgBr and AgBrI emulsions prepared by the twice emulsified method were used to observe the cooperative sensitization of reduction sensitization in the core and sulfur-plus-gold sensitization on the surface of core–shell grains through a space separation of different sensitizing centres by a AgBr shelled layer. The results showed: (1) that core–shell emulsions doped by Ag₂ centres in cores reduced by DMAB exhibited a remarkable increase in sensitivity relative to the corresponding undoped emulsions; (2) that I^? ions in AgBrI grains did not affect the sensitization of internal Ag₂ centres, but were beneficial to the inhibition of fog density; (3) cooperative sensitization by the internal reduced Ag₂ and the surface S+Au sensitizations was considered to result from two different mechanisms, i.e. trapping holes by the former and concentrating electrons by the latter, both of which were beneficial to the efficiency of latent image formation.     

The Effect of TAI Addition on the Ionic Conductivity and Photoelectron Lifetime of Silver Halide Emulsion Microcrystals†

Abstract

The effect of 4-hydroxy-6-methyl-1,3,3a,7-tetraazaindenee (TAI) addition on the electric properties (photoelectric lifetime and ion conductivity) of tabular silver halide microcrystals and their sensito-metric properly has been studied. The result shows that the addition of TAI decreases the ionic conductivity of the tabular silver halide microcrystals and prolongs their photoelectron lifetimes, thus to some extent promoting the sensitivity enhancement of the emulsion.     

[100]面氯化银T颗粒乳剂研究新进展

介绍了 [10 0 ]面氯化银T颗粒乳剂研究新进展。阐述了少量碘对 [10 0 ]面氯化银T颗粒乳剂形成的作用 ;射频光电导的下降和离子电导的增加 ,进一步说明了碘的加入位置对提高 [10 0 ]面T颗粒乳剂感光度的影响。     

Accurate thermal conductivity coefficients for argon based on a state-of-the-art interatomic potential

An accurate interatomic potential was constructed by fitting a realistic function, constrained by theory, to a set of judiciously selected macroscopic and microscopic properties but not including thermal conductivity. Using this potential, accurate values of thermal conductivity of argon are obtained for the temperature range 100 to 6600 K. These are presented in tabular form as well as in terms of a correlation function.     

AgBrI超细粒子乳剂光物理及全息性能的研究

本文研究了三种不同尺寸的AgBrI超细粒子的紫外—可见吸收光谱、低温荧光光谱。实验结果表明,随着颗粒尺寸的减小,吸收峰的位置都发生了规律性的蓝移,表现出量子尺寸效应。激光全息照相的性能测试结果说明：颗粒越细,越有利于提高乳剂的分辨率和衍射效率,以及合适的显影密度也是获得高衍射效率的重要因素。     

A Practical Method for Industrial Heat Stress Allowance Determination

A methodology for determining the heat stress allowances of industrial workers is presented. The methodology has been developed for use by industrial engineers as part of their production assignment and scheduling duties. The methodology provides exposure and recovery allowances in tabular form where the allowances have been developed using the appropriate equations, concepts found in the physiological literature, and meteorological data. The assumptions necessary to provide tabular values are emphasized. A comparison is made with heat stress allowances determined by more arbitrary methods.     

谐波齿轮机构在商业表格印刷机中的应用

从商业表格印刷机特殊要求出发，以某一具体机型的传动系统为例，提出采用谐波齿轮机构解决纵向套准的问题。并且分析研究了谐波齿轮机构的工作原理及其在商业表格印刷机中的使用。     

Synthesis and characterisation of ferromagnetic hexagonal cobalt nanoparticles

Ferromagnetic hexagonal cobalt nanoparticles are synthesised via reduction of cobalt acetate tetrahydrate by using sodium borohydride as a reducing agent. The morphology, crystal structure and magnetic properties of as synthesised particles are characterised by using transmission electron microscopy (TEM), powder X-ray diffraction (XRD) and vibratory sample magnetometer (VSM). The results show that the particles are spherical in shape with a size of 5?nm. These particles show ferromagnetic behaviour with magnetic coercivity of 583?Oe at room temperature. Oleic acid acts as the surfactant and its bonding nature on the cobalt nanoparticles is studied by Fourier transform infrared spectrometry.