Heating oils with fresh vegetable inclusions: modelling and measurement of heating pattern

2003 ◽  
Vol 36 (8) ◽  
pp. 831-842
Author(s):  
E.B Topp ◽  
F.J Cook ◽  
G.C Topp
Author(s):  
Bharti Umrethia ◽  
Bharat Kalsariya ◽  
Prof. P. U. Vaishnav

In present era, herbal extract succeeds inimitable place in pharmaceutical science. In view back the earliest extraction techniques are lost in the mists of history. As time went the plants have been processed by grinding, boiling or immersing. The systemic presentation of Ayurvedic extraction system has been first time familiarized by Acharya Charaka as Panchavidha Kashaya Kalpana (five basic primary dosage forms) and based upon these primary dosage forms, secondary dosage forms are developed by using different heating pattern for extraction of pharmacological active ingredients. The administration of these dosage forms is mainly dependent on the Bala (strength) of Vyadhi (disease) and Atura (patient). Due to increased demand of Ayurvedic medicines and industrialization, the transformation of classical dosage forms takes place by implanting a wide range of technologies with different methods of extraction include conventional techniques such as maceration, percolation, infusion, decoction, hot continuous extraction etc. and recently, alternative methods like ultrasound assisted solvent extraction (UASE), microwave assisted solvent extraction (MASE) and supercritical fluid extractions (SFE). The extract obtained by these procedure uses as a large source of therapeutic phyto-chemicals that may lead to the development of novel drugs. Essentially, the purpose behind this changing face in both the extraction systems are different but can say that it is a new insight from ancient essence.


2011 ◽  
Vol 193 (8) ◽  
pp. 2066-2066 ◽  
Author(s):  
K. Brankatschk ◽  
J. Blom ◽  
A. Goesmann ◽  
T. H. M. Smits ◽  
B. Duffy

2021 ◽  
Vol 35 (1) ◽  
pp. 41-60
Author(s):  
Katarzyna Lisiecka ◽  
Agnieszka Wójtowicz ◽  
Abdallah Bouasla ◽  
Kamila Kasprzak

2003 ◽  
Vol 15 (03) ◽  
pp. 124-132 ◽  
Author(s):  
HAO-LI LIU ◽  
YUNG-YAW CHEN ◽  
JIA-YUSH YEN ◽  
WIN-LI LIN

The purpose of this paper is to investigate the relationship between the formation of the thermal lesion and the major parameters of the external ultrasound heating systems, and to propose a useful thermal lesion determination procedure, which is capable of specifying the range of a thermal lesion by temperature feedback in external ultrasound thermal therapy. This work is based on an ideal ultrasound power deposition formed by an external ultrasound heating system and the temperature distribution is calculated by the transient bioheat transfer equation. A simplified model was employed to determine the heating pattern for four most important parameters. Through the simplified power expression, the property of a new parameter, T300, which is defined as the maximal temperature corresponding to the thermal dose of 300 minutes, is also investigated. When the target volume is large enough such that the thermal conduction effect becomes negligible, the T300 value is almost independent of the system parameters and the heating strategies, and is dominated by the blood perfusion rate with a monotonic correlation. The method enables us to use feedback information in the ultrasound heating process and to pre-determine the heating range of the thermal lesion, which will be very useful in ultrasound treatment planning.


1990 ◽  
Vol 22 (2) ◽  
pp. 39-48 ◽  
Author(s):  
Roger Hinson ◽  
Mooyul Huh ◽  
John G. Lee

Abstract Vegetable production can offer a high-valued cash crop alternative. While returns may be high, vegetables are perceived to have more risk than conventional row crops. This study used stochastic dominance analysis to evaluate terminal market price risk for four vegetable crops across five market locations. Results from the analysis identify differences in efficient market selection depending on the form which price risk follows. While vegetables as a whole are considered risky, substantial differences in the type of terminal market price variability existed between the commodities.


1982 ◽  
Vol 11 (2) ◽  
pp. 25-32
Author(s):  
Michael C. Varner ◽  
Pritam S. Dhillon ◽  
Marie H. Tracy

Marketing costs and contributions to production costs for fresh vegetables marketed through four direct marketing alternatives and through wholesale channels are compared. Budgets derived from empirical observations were the bases for the comparisons. The results favor an elaborate roadside market, which sells a large quantity of items purchased for resale. Farmers’ markets and pick-your-own operations were also found to be potentially more profitable than wholesale marketing.


1977 ◽  
Vol 60 (5) ◽  
pp. 1105-1110 ◽  
Author(s):  
John H Onley ◽  
Laura Giuffrida ◽  
N Fred Ives ◽  
Randall R Watts ◽  
Robert W Storherr

Abstract The Onley-Yip procedure for determining ethylenethiourea (ETU) in milk and crops was modified to reduce interferences by the ethylenebisdithiocarbamates (EBDCs). A 20 g cropmethanol extract is cleaned up by adsorbing the sample onto Gas-Chrom S, desorbing ETU, and eluting ETU from aluminum oxide with chloroform containing ethanol. ETU is converted to the S-butyl derivative for gas-liquid chromatography (GLC) and flame photometric detection (sulfur mode). For liquid chromatography (LC), ETU is cleaned up on another aluminum oxide column and injected directly. LC and GLC results are confirmed by thin layer chromatography. A cooking procedure based on conversion of EBDCs to ETU is included for surveying crops for possible EBDC content. Recoveries from 8 crops and milk fortified at 0.05 ppm ETU ranged from 73 to 100%.


1993 ◽  
Vol 115 (2) ◽  
pp. 319-324 ◽  
Author(s):  
J. von Wolfersdorf ◽  
R. Hoecker ◽  
T. Sattelmayer

A transient heat transfer technique using a heating foil and liquid crystals is described. The basic idea is a step-heating technique, eliminating the local heat flux and the surface temperature during the data reduction. Nonuniformities in the heating pattern are allowed and calibration of the liquid crystals is no longer necessary. They are used as an indicator of an isotherm only. The heat transfer coefficient is deduced from two time measurements. The laminar and turbulent boundary layer flows over a flat plate were tested to verify the applicability and accuracy of the method.


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