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1.629 Aktuelle Fachpublikationen zum Thema temperature

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Indirect Chiral Separation of New Recreational Drugs by Gas Chromatography‐Mass Spectrometry Using Trifluoroacetyl‐L‐Prolyl Chloride as Chiral Derivatization Reagent

22.11.2014 | Jennifer A. Weiß, Stefan Mohr, Martin G. Schmid, Chirality, 2014

ABSTRACT New recreational drugs such as amphetamine‐, cathinone, and benzofury derivatives gained high popularity on the drug market in recent years. They can be purchased via the Internet from different providers and online portals. Most of these compounds are chiral, which makes the ...

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The Effect of Pore Morphology on Hot Spot Temperature

21.11.2014 | George Arthur Levesque, Peter Vitello, Propellants, Explosives, Pyrotechnics, 2014

Abstract Composite explosives contain pores that collapse under shock wave interaction generating localized regions of heat known to be important in the initiation of high explosives. Understanding pore collapse under shock loading is essential to create predictive reactive flow models to ...

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Investigation of Crystal Morphology and Shock Sensitivity of Cyclotrimethylenetrinitramine Suspension by Rheology

21.11.2014 | Robert J. Hudson, Mohammed Moniruzzaman, Philip P. Gill, Propellants, Explosives, Pyrotechnics, 2014

Abstract Crystal morphology and shock sensitivity of a series of cyclotrimethylenetrinitramine (RDX) particles suspended from ethylene glycol were investigated. Flow rheology was employed to measure the rheological properties of the suspensions at constant temperature; it was observed that the ...

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The Interaction of Propionic and Butyric Acids with Ice and HNO3-Doped Ice Surfaces at 195–212 K

20.11.2014 | Manolis N. Romanias; Vassileios C. Papadimitriou; Panos Papagiannakopoulos, Journal of Physical Chemistry A, 2014

The interaction of propionic and butyric acids on ice and HNO3-doped ice were studied between 195 and 212 K and low concentrations, using a Knudsen flow reactor coupled with a quadrupole mass spectrometer. The initial uptake coefficients (γ0) of propionic and butyric acids on ice as a function of ...

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Inline Analysis of the Dry Reforming Process through Fourier Transform Infrared Spectroscopy and Use of Nitrogen as an Internal Standard for Online Gas Chromatography Analysis

20.11.2014 | Roland Lee; Raynald Labrecque; Jean-Michel Lavoie, Energy & Fuels, 2014

In this work, Fourier transform infrared spectroscopy (FTIR) was used as a process analytical tool (PAT), allowing for quantification of the output gas from a dry reforming of methane (DRM) reaction. This PAT was correlated with gas chromatography (GC) analysis, where nitrogen was used as an ...

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Optimization of Spray Drying Process in Commercial Hydrolyzed Fish Scale Collagen and Characterization by Scanning Electron Microscope and Fourier Transform Infrared Spectroscopy

19.11.2014 | Laila D. Latip, Wahidu Zzaman, Md. Zainul Abedin, Tajul A. Yang, Journal of Food Processing and Preservation, 2014

Abstract Response surface methodology was applied to optimize the yield of commercial hydrolyzed fish collagen (Cc) using spray drying process. Two factors were investigated including inlet temperature (130–150C) and flow rate (6–10%) with response to yield. The maximum yields (60.93%) were ...

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A Study of Method Development, Validation, and Forced Degradation for Simultaneous Quantification of Paracetamol and Ibuprofen in Pharmaceutical Dosage Form by RP-HPLC Method

18.11.2014 | Md. Sarowar Jahan, Md. Jahirul Islam, Rehana Begum, Ruhul Kayesh and Asma Rahman, Analytical Chemistry Insights, 2014

A rapid and stability-indicating reversed phase high-performance liquid chromatography (RP-HPLC) method was developed for simultaneous quantification of paracetamol and ibuprofen in their combined dosage form especially to get some more advantages over other methods already developed for this ...

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Rheology of Diluted Heavy Crude Oil Saturated with Carbon Dioxide

17.11.2014 | Ruien Hu; John P. Crawshaw; J. P. Martin Trusler; Edo S. Boek, Energy & Fuels, 2014

The viscosity of heavy crude oils strongly affects their producibility and recovery from oil reservoirs. Thus, the viscosity of heavy crude oils with dissolved gases at different shear rates is valuable knowledge for heavy crude oil exploitation. However, most publications only present viscosity ...

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Green and Sensitive Supercritical Fluid Chromatographic–Tandem Mass Spectrometric Method for the Separation and Determination of Flutriafol Enantiomers in Vegetables, Fruits, and Soil

17.11.2014 | Yan Tao; Fengshou Dong; Jun Xu; Xingang Liu; Youpu Cheng; Na Liu; Zenglong Chen; Yongquan Zheng, Journal of Agricultural and Food Chemistry, 2014

A green and sensitive chiral analytical method was developed to determine flutriafol enantiomers in vegetables (tomato, cucumber), fruits (apple, grape), and soil by supercritical fluid chromatography–tandem mass spectrometry. The enantioseparation was performed within 3.50 min using Chiralpak ...

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Experimental Study of the Reaction of Isopropyl Nitrate with OH Radicals: Kinetics and Products

14.11.2014 | Manolis N. Romanias, Julien Morin, Yuri Bedjanian, International Journal of Chemical Kinetics, 2014

ABSTRACT The kinetics of the reaction of isopropyl nitrate (IPN) with OH radicals has been studied using a low‐pressure flow tube reactor coupled with a quadrupole mass spectrometer: OH + (CH3)2CHONO2 → products (2). The rate constant of the title reaction was determined using both the ...

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