Synthesis and Characterization Performance of Amphiphilic ZnO,a Novel Photocatalyst Suitable for Degradation of Contaminants in Oil–Water Two Phase System

Russian Journal of Physical Chemistry A - Amphiphilic zinc oxide (ZnO) was successfully prepared by modifing neat ZnO with silane coupling reagent KH-570. The modified ZnO and neat ZnO were...     

Characterization of varietal differences in essential oil components of hops (Humulus lupulus) by SFC-FTIR spectroscopy

A supercritical fluid chromatographic method combined with Fourier-transform infrared spectroscopy detection (SFC-FTIR) was developed for determination of varietal differences in essential oil constituents in hops (Humulus lupulus). Infrared spectra (IR) of the major constituents of essential oil of hops were taken as films deposited on AgCl discs and compared with those obtained after chromatographic separation in the IR flow-cell with supercritical carbon dioxide (scCO2). Spectra from AgCl discs were comparable to those in scCO2, but in scCO2 most of the bands appeared approximately 8-10 cm-1 to higher wave numbers. Open-tubular SFC-FTIR analysis of the essential oil of 4 different hop varieties was performed. The SFC-FTIR chromatograms showed differences in the location and relative intensity of the peaks depending on the variety, which was further confirmed by consideration of their FTIR spectra.     

Characterization of soil,sediment, and wastewater samples from hydraulic fracturing processes using the comparative NAA method

Regulatory monitoring of oil and gas development requires the accurate multi-elemental analysis of wellbore samples on a regular basis. In this study, an unconventional method, comparative neutron activation analysis (comparative NAA), was applied for the multi-elemental characterization of solid and liquid hydraulic fracturing samples at the ppm level. The obtained values from three wastewater samples were compared with the most probable values determined via an inter-laboratory study, which involved 15 different laboratories from the United States, Canada, and Germany. The comparison showed that 15 out of 19 comparative NAA trace element concentration values were considered acceptable, providing a new technique to determine elemental concentrations in high salinity hydraulic fracturing samples.

     

砒霜——亦敌亦友,千年情仇

It's believed that everyone is familiar with arsenic trioxide. It has been one of the most famous poisons since ancient time. Because of this, it is largely unfairly described. In this article, we combine research results with clear chemical knowledge and terms, in order to prove that arsenic trioxide can also be useful in human life and production.     

High spin spectroscopy of 139Pr

The high spin states in N=80 ¹³⁹Pr have been investigated by in-beam γ-spectroscopic techniques following the reaction ¹³⁰Te (¹⁴N, 5n) reaction at E=75 MeV, using a gamma detector array, consisting of seven 23% compton-suppressed high purity germanium detectors and a multiplicity ball of fourteen bismuth germanate elements. Based on γ-γ coincidence data, the level scheme of ¹³⁹Pr has been considerably extended up to 7.2 MeV excitation. Tentative spin-parity assignments are done for the newly proposed levels on the basis of the DCO ratios corresponding to strong gates and the available information from the earlier light ion experiments.     

一种用于光束整形的衍射光学元件设计算法

在光束整形衍射光学元件的设计中,为同时减小输出光束的均方根误差和顶部不均匀度值,提出了模糊控制迭代算法(IAFC)。在盖师贝格-撒克斯通(Gerchberg-Saxton,G-S)算法的基础上,提出了平滑修正法,可有效改善输出光束的顶部均匀度,但却增大了均方根误差值。模糊控制迭代算法依据模糊控制理论,通过有效结合盖师贝格-撒克斯通算法和平滑修正法来同时降低均方根误差和顶部不均匀度值。计算机设计的结果表明,利用模糊控制迭代算法可以得到非常理想的输出光束,其均方根误差和顶部不均匀度值分别为0.75%和0.46%,能量转换效率可达94.91%。为光束整形衍射光学元件的设计提供了一种有效的新算法。     

New steps in acute coronary syndrome and antihyperlipidemic treatment: Determination of statins and metabolites by liquid chromatography tandem mass spectrometry

Our aim in this study was to develop a validated liquid chromatography–tandem mass spectrometry (LC–MS/MS) method for the measurement of atorvastatin, rosuvastatin and their major metabolites, and furthermore to evaluate patients’ adherence to statin therapy and to investigate the effect of statin therapy on various hematological and biochemical parameters. A simple protein precipitation was performed for the extraction of analytes and the extracted samples were injected directly. The levels of drugs and their metabolites were measured by the validated method in a total of 210 patients diagnosed with unstable angina pectoris (USAP), ST-elevation myocardial infarction (STEMI) or non-ST-elevation myocardial infarction (NSTEMI). Various biochemical and hematological parameters were measured. The linearity ranges for atorvastatin and rosuvastatin were 1.22–2,500 and 0.97–2000 ng/ml, respectively. The inter-assay coefficient of variation for all analytes was ≤ 6%. In patients diagnosed with USAP, STEMI and NSTEMI, treatment compliance rates were 22.1, 23.5 and 41.2% for atorvastatin and 36.1, 40.2 and 67.1% for rosuvastatin, respectively. An economical, simple and reliable measurement method has been developed. Our findings support the poor patient compliance with statin therapy in the included population. It was observed that 6 months of statin treatment caused slight changes in biochemical and hematological parameters.     

A Comparative Study of Optical Properties of Thin Films of MPS-encapsulated CdS Quantum Dots and SiO2/MPS-encapsulated CdS Quantum Dots Mixture

Optics and Spectroscopy - The aim of this study is to investigate the optical properties of thin films of MPS-encapsulated CdS quantum dots (QDs) and SiO2/MPS-encapsulated CdS QDs mixture. For this...     

Activity,exposure rate and spectrum prediction with Java programming

In order to envision the radiation exposure during Neutron Activation Analysis (NAA) experiments, a software called Activity Predictor is developed using Java^TM programming language. The Activity Predictor calculates activities, exposure rates and gamma spectra of activated samples for NAA experiments performed at Radiation Science and Engineering Center (RSEC), Penn State Breazeale Reactor (PSBR). The calculation procedure for predictions involves both analytical and Monte Carlo methods. The Activity Predictor software is validated with a series of activation experiments. It has been found that Activity Predictor software calculates the activities and exposure rates precisely. The software also predicts gamma spectrum for each measurement. The predicted spectra agreed partially with measured spectra. The error in net photo peak areas varied from 4.8 to 51.29%, which is considered to be due to simplistic modeling, statistical fluctuations and unknown contaminants in the samples.