Lithium tetraborate (LBO or LTO) single crystal seems to be a promising new material for thermoluminescent dosimeter (TLD) and SAW resonators. In the present work, thermoluminescence (TL) characteristic and TL spectra of LTO single crystal grown by Bridgman method were measured, the kinetic parameters of TL traps were calculated, and TL spectra were analyzed. The result shows: The primary glow peaks are at about 186oC and 313oC. The activation energies of the traps corresponding to the two TL peaks are 0.96eV and 1.56eV, and the frequency factors are about 7.94×109s-1 and 6.31×1012s-1. The TL spectra of LTO crystal extends from 350nm to 460nm, and has its maximum at about 381nm. The intrinsic luminescent centers can send the energy from crystal lattice to Cu+ ions, because the activation energies of two are quite similar, and the Cu+ ions become new luminescent centers to increase TL sensitivity when Cu ions are doped into LTO crystals.
With the rapid development of modern industry, water pollution has become an intractable environmental issue facing humans worldwide. In particular, the organic dyes discharged into natural water from dyestuffs, dyeing and the textile industry are the main sources of pollution in wastewater. To eliminate these types of pollutants, degradation of organic contaminants through a photocatalytic technique is an effective methodology. To exploit more crystalline photocatalysts for the degradation of organic dyes, two coordination polymers, namely catena-poly[[(3,5-dicarboxybenzene-1-carboxylato-κO)silver(I)]-μ-trans-1-(pyridin-3-yl)-2-(pyridin-4-yl)ethene-κN:N'], [Ag(CHO)(CHN)] or [Ag(HBTC)(3,4'-bpe)], (I), and poly[[(μ-5-carboxybenzene-1,3-dicarboxylato-κO,O:O:O)[μ-trans-1-(pyridin-3-yl)-2-(pyridin-4-yl)ethene-κN:N']cadmium(II)] monohydrate], {[Cd(CHO)(CHN)]·HO} or {[Cd(HBTC)(3,4'-bpe)]·HO}, (II), have been prepared by the hydrothermal reactions of benzene-1,3,5-tricarboxylic acid (HBTC) and trans-1-(pyridin-3-yl)-2-(pyridin-4-yl)ethene (3,4'-bpe) in the presence of AgNO or Cd(NO)·4HO, respectively. These two title compounds have been structurally characterized by IR spectroscopy, elemental analysis, single-crystal X-ray diffraction and powder X-ray diffraction. In (I), the Ag ions and organic ligands form a one-dimensional coordination chain, and adjacent coordination chains are connected by Ag...O interactions to give rise to a two-dimensional supramolecular network. Each two-dimensional network is entangled with other equivalent networks to generate an infrequent interlocked 2D→3D (2D and 3D are two- and three-dimensional, respectively) supramolecular framework. In (II), the Cd ions are bridged by the HBTC and 3,4'-bpe ligands, which lie across centres of inversion, to give a two-dimensional coordination network. The thermal stabilities and photocatalytic properties of the title compounds have also been studied.
Based on laser and capacitive sensor, a method of measuring deflectable angle is presented, and a noncontact angle measuring system is established. This system has the advantages of simple constitution, real-time, on-line measuring, non-contact and high precision. It can be widely used in engineering, especially in blade angle detection of knife and scissors.
Quartz grains were extracted from volcano ash beside Huguang Maar Lake, and the thermoluminescence (TL) of the grains was measured. Based on the thermoluminescence data of quartz the paleodose of volcanic ash beside Huguang Maar Lake was calculated with sensitized revise technique. The calculated TL dose depending on TL about 315◦C is 75.3±4.8Gy, while the calculated dose depending on TL about 407◦C is 115±8Gy. A physical model is set up to analyze the difference of the two calculation doses, and it can be seen that the latter is relatively veracious.
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