One-step hydrothermal synthesis of fluorescence carbon quantum dots with high product yield and quantum yield

A one-step hydrothermal synthesis of nitrogen and silicon co-doped fluorescence carbon quantum dots (N,Si-CQDs), from citric acid monohydrate and silane coupling agent KH-792 with a high product yield (PY) of 52.56% and high quantum yield (QY) of 97.32%, was developed. This greatly improves both the PY and QY of CQDs and provides a new approach for a large-scale production of high-quality CQDs. Furthermore, N,Si-CQDs were employed as phosphors without dispersants to fabricate white light-emitting diodes (WLEDs) with the color coordinates at (0.29, 0.32). It is suggested that N,Si-CQDs have great potential as promising fluorescent materials to be applied in WLEDs.Peer reviewe

Research Into Technological Indicators of a Rye-wheat Dough Semi-finished Product with the Addition of the Polyfunctional Food Supplement "Magnetofооd"

We studied influence of the polyfunctional food supplement "Magnetofооd" on the technological parameters of rye-wheat dough semi-finished product and the finished product. A positive effect of the supplement "Magnetofооd" on the technological parameters of dough and the bread baked using it, is shown. It was established that adding the food supplement "Magnetofооd" in the amount of 0.15 % of the weight of flour reduces dough fermentation time by 13.0 on average %. The introduction of the food supplement "Magnetofооd" also increases the yield of a dough semi-finished product by 2.9 % on average and improves the yield of the finished product by 3.45 % on average. It was revealed that the multifunctional food supplement "Magnetofооd" enhances the quality of rye-wheat dough semi-finished product and the finished product due to its capacity of moisture retention and the inhibition of hydrolysis processes of the basic ingredients of dough.The obtained experimental data could be used to develop a technology of rye-wheat bread, enriched with the polyfunctional food supplement "Magnetofооd"

Quantum group-twisted tensor products of C*-algebras II

For a quasitriangular C*-quantum group, we enrich the twisted tensor product constructed in the first part of this series to a monoidal structure on the category of its continuous coactions on C*-algebras. We define braided C*-quantum groups, where the comultiplication takes values in a twisted tensor product. We show that compact braided C*-quantum groups yield compact quantum groups by a semidirect product construction.Comment: 26 page

PREDICTING OUTPUT FROM SEEMINGLY UNRELATED AREA AND YIELD EQUATIONS

Crop output can be defined as the product of area sown and yield. Given the existence of separate equations for explaining and predicting area sown and yield, in this paper we suggest predictors for output and derive expressions for the standard errors of the predictors. The methodology is applied to wheat production in the Corrigin Shire of Western Australia.Predicting a product, standard error of prediction, Crop Production/Industries,

The Effects of Washing between Hydrogen Peroxide Bleaching Stages on Brightness Reversion of a Spruce High-Yield Pulp

The final brightness of a bleached high-yield pulp paper product is a very important factor in determining the quality of the pulp and the product. If the brightness of this product tends to revert in time, then the quality of the product could be viewed lesser than before. Brightness reversion of high-yield pulps is the one flaw which is keeping the high-yield pulp market from really expanding in the paper industry. High-yield pulps show economical and environmental advantages with their use in the high quality printing and copy papers market. Much research has been done to find ways to reduce and control brightness reversion, however, no concrete methodology of solving the problem has been derived. The following study takes a spruce CTMP pulp from Canada and sets up an experiment to try and show whether or not washing between hydrogen peroxide bleaching stages can help reduce and control brightness reversion. Two bleaching concentration levels of 2% and 4%, with and without washing, are used as part of the bleaching sequence. The data defining the conclusions of this study are before and after ageing brightness values taken from brightness pads made by the bleached CTMP pulp. This study, based on the data obtained, concludes that a washing stage implemented into the two-stage bleaching sequence was not effective in reducing brightness reversion. The trend in the reduction of brightness reversion shows no significant reduction taking place. It is concluded that the chromophoric structure in the pulp, which aid in causing brightness reversion, are not water soluble and can not be easily washed out of the bleached CTMP pulp. Suggestions for future studies would be to use hot water washing stages and a more industry-based ageing technique

Markets for safety : product recalls yield mixed effects on firms

There have been a number of high-profile cases of product recalls recently. Those incidents suggest that the marketplace generally works as economists would predict. Firms that produce defective goods usually take a hit to their reputation and their bottom line, though there are exceptions.Markets ; Costs (Law)

COAL PYROLYSIS IN INERT CONDITION

Coal pyrolysis is the thermal cracking process in inert gas condition, to produced gas, liquid and solid product. Quantity and quality product will effected by condition of operation. Pyrulysis process to make use of Kalimantan (KPC) in the atmospheric reactor in inert of nitrogen gas as inert with flow rate gas is 350 ml/minute, with measurement of particle is 6/10, 4/6 and 2/4 mesh, to be done at temperature condition 400 – 700 oC and weight of feed 2 kilogram, respectively. It can be concluded that condition of nitrogen inert and fed with step by step can the probabilities limited of internal secondary reaction and effective enough to resist external secondary reaction, it is showed in the increasing of tar production and decreas of gas product, specialy of particle 4/6 and 2/4 mesh with operation temperature higher 600 oC and effectiveness to resist of thermal secondary reaction for 6/10 mesh. The effect temperature to grow into gas product in the measure of particle 6/10 mesh. The yield of char, tar and gases depends on temperature and particle size. The maximum yield tar was obtained at temperature 500o C with particle size 4/6 mesh and the maximum yield gas was obtained at temperature 700o C with particle size 6/10 mesh are 12,4 % and 20.74 % respectively. The concentartion of gases will increase with increasing temperature, but will decrease with increasing particle size. The Atmosphere of nitrogen inert of influence for the higher the particle size at temperature above 500o C, the less gas product, but more tar, were obtained

Polyimide polymers provide higher char yield for graphitic structures

Technique for manufacture of graphite composites uses high-char-forming processable polyimide resin systems to produce the graphitic matrix. Only three cyclic steps are required to yield a 99.7 percent graphite product

Improved Synthesis of 5-methylbenz(a)anthracene

A revised synthesis of 5-methylbenz(a)anthracene is reported. It involves only three simple and convenient steps starting from a commercially available compound, and gives a 82% overall yield. Bromination of 5-methylbenz(a)anthracene with N-bromosuccinimide (NBS) in carbon tetrachloride furnishes 5-bromomethylbenz(a)anthracene in a 92% yield. When bromination is carried out using dimethylformamide as the solvent, 7-bromo-5-methylbenz(a)anthracene is formed as the exclusive product