Kinetic investigation of the cyclopropanation process of fullerene C60 by halogenmethyl ketones under the conditions of the Bingel reaction

2020 ◽  
Vol 44 (18) ◽  
pp. 7277-7285 ◽  
Author(s):  
Yulya N. Biglova ◽  
Ilshat M. Sakhautdinov ◽  
Rustem N. Garifullin ◽  
Gulnaz F. Sakhautdinova ◽  
Akhat G. Mustafin
Keyword(s):  
Fullerene C60 ◽  
Kinetic Investigation ◽  
Time Intervals ◽  
Bingel Reaction ◽  
Kinetics Of

The kinetics of the Bingel reaction with halogenmethyl ketones and C60 fullerene has been studied in streaming mode by sampling the reaction mixture at different time intervals and separating the components using HPLC.

Kinetics of bioactive compounds in functional spice Jiangpo during thermal processing

2012 ◽  
Vol 8 (3) ◽  
Author(s):  
Xiaoyan Dai ◽  
Chenhuan Yu ◽  
Qiaofeng Wu
Keyword(s):  
Kinetic Parameters ◽  
Bioactive Compounds ◽  
Thermal Processing ◽  
Order Rate Constant ◽  
Heat Processing ◽  
Order Kinetic ◽  
Time Intervals ◽  
First Order ◽  
Order Kinetic Model ◽  
Kinetics Of

Abstract Jiangpo is an increasingly popular East Asian spice which is made from Mangnolia officinalis bark and ginger juice. Since it induces bioactive compounds decomposition and has influence on final flavor and fragrance, cooking is regarded as the key operation in preparation of Jiangpo. To evaluate the bioactive compounds content changes of Jiangpo during thermal processing, kinetic parameters including reaction order, rate constant, T1/2 and activation energy of bioactive markers namely honokiol, magnolol and curcumin were determined. Cooking was set at temperatures 60, 90 and 120 °C for selected time intervals. Results displayed the thermal kinetic characteristics of the three compounds. Thermal degradation of Honokiol and magnolol both followed first order kinetic model and the loss of curcumin fitted second order. A mathematical model based on the obtained kinetic parameters has also been developed to predict the degradation of honokiol, magnolol and curcumin in non-isothermal state. All the information in this paper could contribute necessary information for optimizing the existing heat processing of Jiangpo.

Recent 31 P n.m.r. studies of myocardium

1980 ◽  
Vol 289 (1037) ◽  
pp. 437-439 ◽  
Keyword(s):  
Mechanical Performance ◽  
Normal Values ◽  
Chemical Exchange ◽  
Exchange Reactions ◽  
Perfused Heart ◽  
Time Intervals ◽  
Non Invasive ◽  
Biochemical State ◽  
Perfused Hearts ◽  
Kinetics Of

Earlier work from this laboratory has concerned the possible use of phosphorus n.m.r. as a method to monitor, in a non-invasive manner, the biochemical state of the perfused heart as a function of its mechanical performance. We showed that a simulated coronary infarction could be detected by 31 P n.m.r. (Hollis et al 1978 a and that hypothermia and KC1 arrest could preserve the pH and the ATP levels at more nearly normal values than in a non-arrested heart during long periods (40 min) of ischaemia (Hollis et al . 1978 b ).More recently it was shown that multiple doses of KC1, given at intervals, were more effective in this respect than was a single dose (Flaherty et al . 1979). These studies essentially followed the kinetics of transitions of the heart between two or more distinct physiological states (i.e. normoxic and ischaemic, with or without KC1 arrest) by observation of the 31 P n.m.r. spectra at various time intervals over periods of up to 1 h. As described in detail and demonstrated in Dr Truman Brown’s contribution to these discussions, the rates of chemical exchange reactions occurring in a steady state can be measured by the techniques of saturation transfer in various biological systems, including perfused hearts.

Debinding Kinetics of a Water Soluble Binder System for Titanium Alloys Metal Injection Moulding

2012 ◽  
Vol 520 ◽  
pp. 174-180 ◽  
Author(s):  
Gang Chen ◽  
Guian Wen ◽  
Neil Edmonds ◽  
Peng Cao ◽  
Yi Min Li
Keyword(s):  
Bath Temperature ◽  
Water Soluble ◽  
Specimen Thickness ◽  
Porous Powder ◽  
Binder System ◽  
Alloyed Powder ◽  
Time Intervals ◽  
Binder Removal ◽  
Extraction Behaviour ◽  
Kinetics Of

A water soluble binder system is used to prepare Ti-6Al-4V and NiTi pre-alloyed powder feedstock. The binder dissolution and transport kinetics through the porous powder skeleton are studied for various powder morphologies and powder loadings from 60 to 69.5 vol.%. The binder removal behaviours are evaluated with different debinding time intervals. The focus of this work is to investigate the influences of shaping pressure, specimen thickness and water bath temperature on the binder extraction behaviour.

Kinetics of cellular influx and histamine release in normal human bronchi

1989 ◽  
Vol 257 (4) ◽  
pp. L277-L283
Author(s):  
J. A. Cooper ◽  
W. W. Merrill ◽  
M. G. Buck
Keyword(s):  
Flow Rate ◽  
Variable Degree ◽  
Time Intervals ◽  
Bronchial Inflammation ◽  
Granulocyte Infiltration ◽  
Human Volunteers ◽  
Normal Human ◽  
Bronchial Biopsies ◽  
Kinetics Of ◽  
Human Bronchi

Inhalation of certain substances can induce bronchial inflammation followed by bronchoconstriction or bronchial hyperreactivity. We have developed a model of airway inflammation and bronchoconstriction induced by an aqueous extract of cotton bracts (CBE) in which the severity of flow rate reduction correlates with the presence of bronchoalveolar neutrophils. In the current study normal human volunteers underwent local bronchial instillation of CBE. Bronchial lavage histamine concentrations and cellular populations were determined at time intervals after local challenge. In addition, bronchial biopsies were obtained after CBE instillation, and the degree of subepithelial inflammation was quantitated. We report that lavage of bronchi locally exposed to CBE contains 1) greater histamine concentrations 4 min after challenge compared with lavage from saline-challenged bronchi and 2) concentrations of eosinophils and macrophages that are greater than control lavage 8 min after exposure. Bronchial biopsies taken after CBE instillation also demonstrated a variable degree of subepithelial granulocyte infiltration that correlated with the global bronchoconstricting response to CBE assessed on a separate day. These studies suggest that inflammation can develop rapidly in normal human bronchi and may precede significant flow rate reductions by greater than 1 h.

scholarly journals Kinetics of NiO and NiCl2Hydrogen Reduction as Precursors and Properties of Produced Ni/Al2O3and Ni-Pd/Al2O3Catalysts

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Miroslav Sokić ◽  
Željko Kamberović ◽  
Vesna Nikolić ◽  
Branislav Marković ◽  
Marija Korać ◽  
...  
Keyword(s):  
Metal Content ◽  
Hydrogen Reduction ◽  
Effect Of Temperature ◽  
Synthesis Process ◽  
Reduction Temperature ◽  
Time Intervals ◽  
Reduction Processes ◽  
Calcination Step ◽  
Before And After ◽  
Kinetics Of

The objects of this investigation were the comparative kinetic analysis of the NiO and NiCl2reduction by hydrogen during an induction period and elimination of the calcination during the synthesis of Ni/Al2O3catalysts. The effect of temperature and time on NiO and NiCl2reduction degrees was studied. Avrami I equation was selected as the most favorable kinetic model and used to determine activation energy of the NiO and NiCl2reduction for the investigated temperature range (623–923 K) and time intervals (1–5 minutes). The investigation enabled reaching conclusions about the reaction ability and rate of the reduction processes. Afterward, Ni/Al2O3catalysts were obtained by using oxide and chloride precursor for Ni. The catalysts were supported on alumina-based foam and prepared via aerosol route. Properties of the samples before and after low-temperature hydrogen reduction (633 K) were compared. Obtained results indicated that the synthesis of Ni/Al2O3catalysts can be more efficient if chloride precursor for Ni is directly reduced by hydrogen during the synthesis process, without the calcination step. In addition, Ni-Pd/Al2O3catalysts with different metal content were prepared by using chloride precursors. Lower reduction temperature was utilized and the chlorides were almost completely reduced at 533 K.

Diagnosis of Rolling Bearing by Measuring Time Interval of AE Generation

1999 ◽  
Vol 121 (3) ◽  
pp. 468-472 ◽  
Author(s):  
Takeo Yoshioka ◽  
Atsushi Korenaga ◽  
Hiroki Mano ◽  
Takashi Yamamoto
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Bearing ◽  
Rolling Contact ◽  
Time Interval ◽  
Measuring Time ◽  
Time Intervals ◽  
Measured Time ◽  
Ae Signal ◽  
Kinetics Of

We have developed a new method for measuring time intervals of Acoustic Emission (AE) generation for diagnosis of a radial rolling bearing. The method makes the AE signal itself a trigger of the oscillation of the clock pulse and measures the time interval of AE generation by integration of the clock pulses. The measurement device consists of the threshold, clock, time interval measurement and memory circuit, and was applied to rolling contact fatigue experiments. It was confirmed by the experiments that the measured time intervals of AE generation on the inner raceway or the ball agreed with the value calculated based on the kinetics of the rolling bearing. Moreover, we could identify the elements in which a fatigue crack was propagating by the method before the spalling appeared. The identified elements agreed with the failed elements.

Influence of fullerene C60 on the kinetics of toluene evaporation

2006 ◽  
Vol 79 (7) ◽  
pp. 1202-1203 ◽  
Author(s):  
B. M. Ginzburg ◽  
V. L. Ugolkov ◽  
G. N. Fedorova ◽  
E. Yu. Melenevskaya ◽  
L. A. Shibaev ◽  
...  
Keyword(s):  
Fullerene C60 ◽  
Kinetics Of
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