Materials Literature
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The photochemical processes of singlet-singlet energy transfer and photoinduced electron transfer are important not only in natural and artificial photosynthetic energy conversion, but also in a variety of other scientific and technological applications. Controlling these functions at the molecular level using outside…
Förster resonance energy transfer (FRET), which involves the nonradiative transfer of excitation energy from an excited donor fluorophore to a proximal ground-state acceptor fluorophore, is a well-characterized photophysical tool. It is very sensitive to nanometer-scale changes in donor-acceptor separation distance an…
STAC8 is a significant improvement upon its predecessor PHOTON and is a valuable analytical code for quick and conservative beamline shielding designs for synchrotron radiation (SR) facilities. In order to check the applicability, accuracy and limitations of STAC8, studies were conducted to compare the results of STAC…
Solubilities of NH 4 Al(SO 4 ) 2 ·12H 2 O in mixed aqueous solutions of Al 2 (SO 4 ) 3 and (NH 4 ) 2 SO 4 were determined at (25, 30, 40, and 50) °C. At the same temperatures, solubilities of NH 4 Al(SO 4 ) 2 ·12H 2 O in the (NH 4 ) 2 SO 4 + Al 2 (SO 4 ) 3 + H 2 SO 4 + H 2 O system and densities of the equilibrium sol…
Abstract The influence of semiconducting electrodes on the properties of thin ferroelectric films is considered within the framework of the phenomenological Ginzburg–Landau theory. The contribution of the electric field produced by charges in the electrodes allowing for the screening length of the carriers is included…
The deuterium-deuterium (D-D) reaction in the KSTAR (Korea Superconducting Tokamak Advanced Research) tokamak generates neutrons with a peak yield of 2.5 x 10(16) s(-1) through a pulse operation of 300 s. Since the structure material of the tokamak is irradiated with neutrons, this environment will restrict work aroun…
In this paper, some results of the study on the roles of the dopants in the LiF:Mg,Cu,Na,Si thermoluminescent (TL) material that was developed at the Korea Atomic Energy Research Institute for radiation protection are presented. Although there have been many studies to investigate the roles of the dopants in LiF:Mg,Cu…
Abstract The solubility and diffusion coefficient of carbon dioxide in intermediate‐moisture starch–water mixtures were determined both experimentally and theoretically at elevated pressures up to 16 MPa at 50 °C. A high‐pressure decay sorption system was assembled to measure the equilibrium CO 2 mass uptake by the st…
A new series of double perovskites of stoichiometry Sr2−xCexFeMoO6 (0 ≤ x ≤ 1) has been prepared by a wet chemistry procedure yielding very reactive precursors, which were subsequently annealed under reducing conditions. The compounds have been studied by X-ray (XRD), neutron powder diffraction (NPD), Mössbauer spectr…
Abstract With block copolymer equilibrium phase behavior becoming increasingly better understood, a more detailed description of ordering kinetics is feasible. This article highlights recent experimental observations that provide new insight into ordering kinetics and grain structures when a block copolymer liquid is…
The internal structure of single crystals and twinned crystals of isotactic poly(vinylcyclohexane) (PVCH) has been investigated by electron diffraction and dark-field imaging following a procedure introduced by Pradère et al. ( Macromolecules 1988, 21, 2747). Crystals produced in thin film at high T c are single cryst…
A system has been developed to improve the efficiency of maintenance work while decreasing the radiation exposure of maintenance personnel in nuclear power plants. The input data for dose rate calculation are automatically generated by using computer-aided design data. Changes for the input data corresponding to the p…
Radiation dosimetry for manned spaced missions depends on the ability to adequately describe the process of high-energy ion transport through many materials. Since the types of possible nuclear interactions are many and complex, transport models are used which depend upon a reliable source of experimental data. To exp…
Starting from selection rules for intershell tunneling in double-walled nanotubes with commensurate (c-DWNTs) and incommensurate (i-DWNTs) shells, we show that for i-DWNTs the coupling is negligible between lowest energy subbands, but it becomes important as the higher subbands become populated. In turn the elastic me…
A novel class of molecular clips was synthesized, which are soluble in most non-polar organic solvents. Aromatic amines and diethoxycarbonyl glycoluril were used for the first time in this type of reaction. All reaction products gave satisfying 1H NMR, 13C NMR, MS, and IR spectra. In addition, the structure and confor…
22Na is one of the long-lived radionuclides induced in shielding concrete of a beam-line tunnel of a high-energy particle accelerator facility and poses a problem of radiation wastes at the decommissioning of the facility. In order to estimate the 22Na concentration induced in shielding concrete, chemical reagents suc…
Radiotoxicity and decay heat power of the spent nuclear fuel of VVER-1000 type reactors are calculated during storage time up to 300,000 y. Decay heat power of radioactive waste (radwaste) determines parameters of the heat removal system for the safe storage of spent nuclear fuel. Radiotoxicity determines the radiolog…
Various procedures of mixing starting powders for hot‐pressing α‐SiAlON ceramics were studied. They included different milling methods (attrition milling, ball milling, and sonication), liquid medium (water, isopropyl alcohol, and pyridine), and atmospheres (ambient air and nitrogen). These mixing procedures resulted…
A variety of methods employing radiation transport and point-kernel codes have been used to model two skyshine problems. The first problem is a 1 MeV point source of photons on the surface of the earth inside a 2 m tall and 1 m radius silo having black walls. The skyshine radiation downfield from the point source was…
The IR and Raman spectra of calcium hydrogen triacetate monohydrate, CaH(CH 3 COO) 3 × H 2 O, (Speakman's classification: B type acid salt) in the 4000-400 cm -1 frequency region are presented and discussed with respect to the fundamental vibrations of acetic acid species (CH 3 COO - and CH 3 COOH) and hydrogen bond v…