scholarly journals Environment control for beef freezing simulation and determination of thermal characteristics

2021 ◽  
Vol 644 (1) ◽  
pp. 012021
Author(s):  
C D Iskandar ◽  
A A Munawar ◽  
T M Lubis ◽  
Zainuddin
2020 ◽  
Vol 02 (11) ◽  
pp. 62-67
Author(s):  
Nizomjon Orifovich Usmonov ◽  
◽  
Xayrulla Sunnatullaevich Isakhojaev ◽  
Saodat Rakhsulaevna Akhmatova ◽  
Feruza Abdullaevna Khoshimova ◽  
...  

In the production of flat solar water heating collectors, thermal testing occupies a special place, the purpose of which is to determine their thermal characteristics experimentally. The corresponding approximation expressions are proposed for determining the coefficient of heat loss, inclined to the horizon at an angle of 300 for the average conditions of their operation in the hot water supply system


2015 ◽  
Vol 9 ◽  
pp. 4307-4322
Author(s):  
Pavel V. Balabanov ◽  
Vasiliy A. Pogonin ◽  
Alexander N. Pchelintsev

2017 ◽  
Vol 91 ◽  
pp. 791-799 ◽  
Author(s):  
Vladimir Fateev ◽  
Mikhail Agafontsev ◽  
Sergey Volkov ◽  
Alexander Filkov

2019 ◽  
Vol 6 (2) ◽  
pp. 94-100
Author(s):  
Rona Maningting Napitupulu ◽  
Dirgarini Julia ◽  
Aman S. Panggabean

Validation method on the determination of Mn in lubricating oil by direct dilution method using Atomic Absorption Spectrophotometer (AAS) in Laboratory & Environment Control PT. Badak NGL Bontang has been done The validation method was done with research stages such as determination of  optimum solvent, and determination of some important parameters influential for validation method such as parameter of liniearitas (r), Instrument Detection Limit (IDL), Methode Detection Limit (MDL), accuracy, precision, Limit of Detection(LOD) and Limit of Quantitation(LOQ). The result of research obtain is good, showed that the linearity value with R2 ≥ 0,997. The IDL and MDL value was 0.0021 ppm and 0.0092 ppm respectively and has been acceptability requirements of MDL. The accuracy paramater obtained recovery value with range 82.25-88.34%. The measurement of repeatability and reproducibility, the CV Horwitz value smaller than % RSD, indicating the method had a good precision. The measurement of  LOD and LOQ value was 0.095 ppm 0.317 ppm respectively. Based on the result of the research determination method of Mn in lubricating oil by direct dilution method using AAS concluded valid.


Author(s):  
A. V. Drannikov ◽  
T. N. Tertychnaya ◽  
A. A. Shevtsov ◽  
N. V. Zasypkin ◽  
A. A. Ryndin

In solving the problem of vegetable protein deficiency, triticale grain is of great interest – a unique hybrid that com-bines the best hereditary qualities of wheat and rye. The protein content of triticale is 1.0 – 1.5% higher than that of wheat and 3–4% higher than that of rye. Obtained a new variety of grain triticale – "Slide". Products prepared from this grain crop have a high nutritional value, since the protein that is part of triticale is characterized by an increased content of essential amino acids, and is not inferior to wheat grain in terms of the content of macro – and micro-elements. It contains a lot of copper, phosphorus, potassium, magnesium, calcium, sodium, zinc, manganese and iron, as well as vitamins В9, В5, В1, PP and E. Information about thermal characteristics as functions of tempera-ture plays a key role in engineering calculations and mathematical modeling of the processes of drying and heat treatment of triticale grain. The method of nonstationary thermal regime, based on the solution of the problem of thermal conductivity over two temperature-time points, developed by B.C. Wolkenstein, was used to determine the thermophysical characteristics. The determination of the thermophysical characteristics of the grain was carried out on the Kossfield RT 1394 N measuring unit (National Instruments). Revealed the character of the dependence of diffusivity, thermal conductivity and specific heat capacity on temperature. Equations describing the thermophysi-cal characteristics of grain at a humidity of 13.57 and 21.83% in the temperature range of 20–100 оС are obtained


2019 ◽  
Vol 286 ◽  
pp. 08010
Author(s):  
Mohammed Niagui ◽  
Youssef Haddout ◽  
Abdelaziz Oubarra ◽  
Jawad Lahjomri

This work is devoted to the determination of the analytical solution of the problem of the laminar forced convection of the Jeffery-Hamel slip flow through a convergent microchannel. The analytical solution is obtained by using a self-adjoint formalism of the functional analysis. The solution represents an extension of the solution obtained in the conventional continuum flow by considering the boundaries slip conditions at the wall and the streamwise heat conduction. This extension has been done by using a new matrix operator of three dimensions in the Hilbert space. The results show that the thermal characteristics are strongly influenced by the Reynolds, Prandtl and Knudsen numbers, the aperture angle of the channel and the streamwise heat conduction.


Biosensors ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 71
Author(s):  
Evan Kazura ◽  
Ray Mernaugh ◽  
Franz Baudenbacher

Enzyme-catalyzed chemical reactions produce heat. We developed an enclosed, capillary-perfused nanocalorimeter platform for thermometric enzyme-linked immunosorbent assay (TELISA). We used catalase as enzymes to model the thermal characteristics of the micromachined calorimeter. Model-assisted signal analysis was used to calibrate the nanocalorimeter and to determine reagent diffusion, enzyme kinetics, and enzyme concentration. The model-simulated signal closely followed the experimental signal after selecting for the enzyme turnover rate (kcat) and the inactivation factor (InF), using a known label enzyme amount (Ea). Over four discrete runs (n = 4), the minimized model root mean square error (RMSE) returned 1.80 ± 0.54 fmol for the 1.5 fmol experiments, and 1.04 ± 0.37 fmol for the 1 fmol experiments. Determination of enzyme parameters through calibration is a necessary step to track changing enzyme kinetic characteristics and improves on previous methods to determine label enzyme amounts on the calorimeter platform. The results obtained using model-system signal analysis for calibration led to significantly improved nanocalorimeter platform performance.


2020 ◽  
pp. 90-93
Author(s):  
Andrey Borisovich Batrashov ◽  
◽  
Natalya Vladimirovna Gushhina ◽  

The paper proposes a method for assessing electric and thermal operation modes of direct current catenary elements that allows determining electric and thermal loads in operation conditions. The main principle is the determination of the most loaded section in the intersubstational zone and calculation of electric and thermal characteristics in conditions of real train schedule. The method is assumed to be used at digitalization of railways as a digital copy of direct current catenary.


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