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Artykuły w czasopismach na temat „Power temperature coefficient”

Autor: Grafiati

Data publikacji: 28 września 2024

Data aktualizacji: 31 lipca 2025

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1

Fokeev, A. E., and I. N. Tumakov. "Analysis of Operating Modes of Oil-Immersed Power Transformers with a Voltage of 10 (6) / 0.4 kV." Vestnik IzhGTU imeni M.T. Kalashnikova 24, no. 4 (2021): 80–91. http://dx.doi.org/10.22213/2413-1172-2021-4-80-91.

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The rate of thermal aging of the power transformers windings insulation depends on the effects of the electric field, mechanical stresses, temperature and processes that cause changes in these factors. A calculation algorithm is considered that allows determining the temperature of the most heated point of the windings of an oil power transformer at known values of the load current and ambient temperature. Calculation of the most heated winding point temperature and the rate of thermal aging of insulation for an oil power transformer at different ambient temperatures during the year, different

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2

Radziemska, E., and E. Klugmann. "Photovoltaic Maximum Power Point Varying with Illumination and Temperature." Journal of Solar Energy Engineering 128, no. 1 (2005): 34–39. http://dx.doi.org/10.1115/1.2147586.

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This paper presents the experimental results and discusses the track of the maximum power point on the current-voltage curve of a PV module due to changes of the illumination level and temperature. A time decrease of the voltage and simultaneous temperature increase during the initial stage of irradiation has been observed. Some practical implementation aspects of a maximum power point tracking unit, which match the current and voltage characteristics of the load to the PV module’s maximum power point automatically, are also discussed. A linear decrease of the maximum output power Pm with temp

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3

Konovalov, Dmytro, Ignat Tolstorebrov, Yuhiro Iwamoto, Halina Kobalava, Jacob Joseph Lamb, and Trygve Magne Eikevik. "Optimizing Low-Temperature Three-Circuit Evaporative Cooling System for an Electric Motor by Using Refrigerants." Energies 17, no. 16 (2024): 3942. http://dx.doi.org/10.3390/en17163942.

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This article presents modeling results and a comprehensive analysis of evaporative cooling systems designed for electric motors using the refrigerants R744 (trans-critical), R134a, R600a, and R290. This study aims to determine the most suitable refrigerant for use in a cooling system, optimize the system design, and calculate the maximum achievable motor power while adhering to specified temperature constraints. The modeling was validated by an experimental setup, which had the cooling system’s configuration featuring three circuits for motor housing, stator, and rotor cooling, respectively. T

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4

Tsao, Bang Hung, Jacob Lawson, James D. Scofield, Clinton Laing, and Jeffery Brown. "3D Thermal Stress Model for SiC Power Modules." Materials Science Forum 600-603 (September 2008): 1227–30. http://dx.doi.org/10.4028/www.scientific.net/msf.600-603.1227.

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Three dimensional models of both single-chip and multiple-chip power sub-modules were generated using ANSYS in order to simulate the effects of various substrate materials, heat fluxes, heat transfer coefficients, and device placement configurations on temperature and thermal stress contours. Alumina, aluminum-nitride, and CVD diamond were compared as substrates. Heat fluxes of 100 to 500 watts/cm2 resulted in SiC device junction temperatures in the range of 350 to 650 K. The predicted maximum operating temperature for a chip, to which 300 watts/cm2 of heat flux was applied, would be 239°C (51

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5

He, Jianxia, and Qingyan Li. "On the global well-posedness and exponential stability of 3D heat conducting incompressible Navier-Stokes equations with temperature-dependent coefficients and vacuum." Electronic Research Archive 32, no. 9 (2024): 5451–77. http://dx.doi.org/10.3934/era.2024253.

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<p>This paper focuses on investigating the initial-boundary value problem of incompressible heat conducting Navier-Stokes equations with variable coefficients over bounded domains in $ \mathbb{R}^3 $, where the viscosity coefficient and heat conduction coefficient are powers of temperature. We obtain the global well-posedness of a strong solution under the assumption that the initial data and the measure of the initial vacuum region are sufficiently small. It is worth mentioning that the initial density is allowed to contain vacuum, and there are no restrictions on the power index of the

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6

Kang, Yunxin, and Ling Xu. "First-order Bandgap Reference Source Design with High Power Supply Rejection Ratio." Journal of Physics: Conference Series 2405, no. 1 (2022): 012003. http://dx.doi.org/10.1088/1742-6596/2405/1/012003.

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Abstract In this paper, a first-order bandgap reference source with a high power supply rejection ratio (PSRR) is designed. To obtain a low-temperature coefficient, a first-order bandgap temperature coefficient compensation method is used by adjusting the resistor resistance of the positive and negative temperature coefficients, and the gate-source voltage of the current mirror transistor is kept constant to increase the PSRR value in the low-frequency band. A self-start circuit is added to make the circuit start up quickly out of the simple bias point. The simulation results show that the ban

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7

Hossain, Md Al Amin, Md Abdul Malek Soner, Md Abdus Salam, Md Fazlul Huq, and Md Shamsul Huda Sohel. "Measurement of Feedback Reactivity Effects of the Baec Triga Reactor." Journal of Bangladesh Academy of Sciences 42, no. 2 (2018): 183–90. http://dx.doi.org/10.3329/jbas.v42i2.40050.

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The aim of this study is to measure the feedback reactivity effects of the Bangladesh Atomic Energy Commission (BAEC) TRIGA Research Reactor (BTRR). Using digital instrumentation and control (I&C) system, feedback parameters such as reactivity coefficients of fuel, moderator and power effects are measured. At 300 kW reactor power, the obtained results for fuel temperature coefficient are 0.664 ꬿ/0c and 0.765 ꬿ/0c at C1 and D3 core positions respectively. The results for 100 kW to 400 kW reactor power show its increasing nature as the reactor power increases. The measured value of the moder

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8

Prijić, Z., Z. Pavlović, S. Ristić, and N. Stojadinović. "Zero-temperature-coefficient (ZTC) biasing of power VDMOS transistors." Electronics Letters 29, no. 5 (1993): 435. http://dx.doi.org/10.1049/el:19930291.

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9

Imhoff, Eugene A., Karl D. Hobart, Francis J. Kub, et al. "Positive Temperature Coefficient SiC PiN Diodes." Materials Science Forum 717-720 (May 2012): 981–84. http://dx.doi.org/10.4028/www.scientific.net/msf.717-720.981.

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Integration of patterned ballast resistance into the anode of SiC PiNs is a solution to the dilemma of negative dVf /dT for such diodes. In fabricated 4H-SiC PiN diodes, we demonstrate a cross-over from negative to positive temperature coefficient for current densities as low as 80 A/cm2. Adjusting the percentage of the patterned anode area, the positive or neutral dVf /dT can be achieved over a wide current-density range without substantial penalty in the forward voltage drop. This characteristic is crucial for high-power SiC packages with ganged-parallel rectifier arrays.

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10

Garrido, Javier, and José A. Manzanares. "Thomson/Joule Power Compensation and the Measurement of the Thomson Coefficient." Materials 17, no. 18 (2024): 4640. http://dx.doi.org/10.3390/ma17184640.

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The energy transported by the electric current that circulates a thermoelectric element (TE) varies with position due to the Joule and Thomson effects. The Thomson effect may enhance or compensate the Joule effect. A method for measuring the Thomson coefficient of a TE is presented. This method is based on the total compensation of the Joule and Thomson effects. The electric current then flows without delivering power to the TE or absorbing power from it. For a TE, the global Thomson/Joule compensation ratio Φ¯T/J is defined as the ratio of the power absorbed by the current due to the Thomson

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11

Kazansky, Yury, and Yanis Slekenichs. "Power coefficient of reactivity: definition, interconnection with other coefficients of reactivity, evaluation of results of transients in power nuclear reactors." Nuclear Energy and Technology 4, no. (2) (2018): 111–18. https://doi.org/10.3897/nucet.4.30663.

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It is assumed by the authors of the present paper that with growing contribution of nuclear power in the production of electricity, nuclear power plants will be used to a higher degree in a manoeuvrable mode of operation rather than in the base-load mode. In other words, change of power from the nominal level to that of coverage of auxiliary loads will be becoming quite common and not so rare event as scheduled reactor shutdowns for fuel reloading or preventive works. There exist well-known problems in the use of nuclear reactors in the manoeuvrable operation mode, which include the task share

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12

Lin, Jyun-Min, Ying-Chung Chen, and Chi-Pi Lin. "Annealing Effect on the Thermoelectric Properties of Bi2Te3Thin Films Prepared by Thermal Evaporation Method." Journal of Nanomaterials 2013 (2013): 1–6. http://dx.doi.org/10.1155/2013/201017.

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Bismuth telluride-based compounds are known to be the best thermoelectric materials within room temperature region, which exhibit potential applications in cooler or power generation. In this paper, thermal evaporation processes were adopted to fabricate the n-type Bi2Te3thin films on SiO2/Si substrates. The influence of thermal annealing on the microstructures and thermoelectric properties of Bi2Te3thin films was investigated in temperature range 100–250°C. The crystalline structures and morphologies were characterized by X-ray diffraction and field emission scanning electron microscope analy

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13

Huang, Pei, Tong Shen, Zhenxing Liu, Renjun Dian, Wanlun Xu, and Dan Wang. "Thermal characteristics analysis of medium frequency transformer under multiple working conditions." Thermal Science, no. 00 (2023): 239. http://dx.doi.org/10.2298/tsci230807239h.

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Medium frequency transformer (MFT) plays an important role in high power AC-DC transformation in power grid, due to its high power density and high loss density, it brings difficulty to heat dissipation. Thermal reliability is crucial for transformer design, different from the previous work, the thermal characteristics of MFT under different working conditions are concerned and analyzed in this paper. The temperature field model of MFT is established, and the temperature field characteristics of MFT at rated load, no load, overload, fluctuating overload and short circuit conditions are simulat

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14

Zhao, Xiaokun, Minghao Ni, Wencai Wang, Hongwei Wang, and Jianing Wang. "Study on the Fire Characteristics of Dual Fire Sources and the Difference in Power Temperature of Different Fire Sources in Tunnel." Fire 7, no. 8 (2024): 273. http://dx.doi.org/10.3390/fire7080273.

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To investigate the combustion characteristics of multiple fire sources in the tunnel caused by ‘jumping’ discontinuous fire spread, we utilized scaled model experiments, numerical simulation software, and theoretical research. Our study focused on analyzing the influence of different fire source powers on the temperature characteristics of double fire sources in the tunnel. We examined the temperature characteristics, critical wind speed, and change rule under various wind speeds, fire source spacing, and fire source powers. Additionally, we explored the temperature characteristics, critical w

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15

Chen, Pingwei, Tong Wang, Wensheng Ma, Zhongliang Xie, and Guangbin Yu. "CFD-Predicted Rotordynamic Characteristics for High-Temperature Water Liquid Seal Considering Tooth Deformation." Lubricants 10, no. 10 (2022): 240. http://dx.doi.org/10.3390/lubricants10100240.

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With the development of high-temperature centrifugal pump, the temperature of the medium in the pump must be higher than the normal water temperature. It is particularly important to study the rotordynamic characteristics of the seal at high temperature due to it being the core component of the rotor system. This paper takes the high temperature water liquid seal as a research object to study its rotordynamic characteristics based on the fluid-solid-thermal coupling, the deformation of seal teeth under thermal and dynamic loads was calculated. Based on the test rig, the leakage flow rate and d

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16

Feng, Wen Jiang, Chuan Yin Wang, Zhi Guo Zhang, and Wei Zheng. "Physical Properties of High-Temperature Liquid Furnace Slags." Applied Mechanics and Materials 319 (May 2013): 62–65. http://dx.doi.org/10.4028/www.scientific.net/amm.319.62.

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The room-temperature furnace slag from a pig iron plant was investigated and the corresponding chemical composition was obtained. The temperature dependences of viscosity coefficient, resistance, and heat transfer coefficient were measured in detail. With increasing temperatures, the value of viscosity coefficient and resistance is lowered, while that of heat transfer coefficient enlarged. The fit of temperature dependence of viscosity coefficient gives y0=1.9672, A=1.95×1019, t=31.8. Above 1000 oC, solid slags become melted and flown, with abrupt increase of heat transfer coefficient. Based o

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17

Hong, Chih-Chiang. "Determining the Advanced Frequency of Composited Functionally Graded Material Plates Using Third-Order Shear Deformation Theory and Nonlinear Varied Shear Coefficients." Journal of Composites Science 8, no. 8 (2024): 325. http://dx.doi.org/10.3390/jcs8080325.

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The shear effect is usually considered in the numerical calculation of thick composited FGM plates. The characteristics that have the greatest effect on thickness are displacement type, shear correction coefficient, material property and temperature. For the advanced frequency study of thick composited functionally graded material (FGM) plates, it is interesting to consider the extra effects of the nonlinear coefficient c1 term of the third-order shear deformation theory (TSDT) of displacement on the calculation of varied shear correction coefficients. The values of nonlinear shear correction

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18

Adedoja, Oluwaseye Samson, Damilola Elizabeth Babatunde, and Olubayo Moses Babatunde. "HYBRID POWER SYSTEM FOR A FUEL STATION CONSIDERING TEMPERATURE COEFFICIENT." International Journal of Energy Economics and Policy 10, no. 6 (2020): 476–82. http://dx.doi.org/10.32479/ijeep.9886.

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19

PAEZ, B. A., H. MÉNDEZ, and J. C. GIRALDO. "THERMOELECTRIC POWER COEFFICIENT IN A QUANTUM WELL." Surface Review and Letters 09, no. 05n06 (2002): 1765–68. http://dx.doi.org/10.1142/s0218625x02004372.

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Based on the solution of the quantum Boltzmann equation, in the linear transport approximation for an isotropic low-dimensional system, the thermoelectric power coefficient, Q, in a quantum well structure was determined. These calculations are based on variational methods, taking into account especial functions which include important parameters being varied at the time of evaluating the thermoelectric power, e.g. height and width barrier. Values of Q are carried out by using a computer code written in Mathematica, which allows one to depict them easily and in this way to compare different beh

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20

Choi, Han Na, Seung Hyun Jee, Jaehwan Ko, Dong Joo Kim, and Sun Hee Kim. "Properties of Surface Heating Textile for Functional Warm Clothing Based on a Composite Heating Element with a Positive Temperature Coefficient." Nanomaterials 11, no. 4 (2021): 904. http://dx.doi.org/10.3390/nano11040904.

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A high-stretch positive temperature coefficient (PTC) surface heating textile (PTC-SHT) was fabricated using a composite of PTC powder and multiwall carbon nanotubes (MWCNTs). The PTC-SHT (heating area = 100 × 100 mm2) was produced by screen-printing the PTC-MWCNT composite paste onto a high-stretch textile with embroidered electrodes. Overall, the temperature increased to 56.1 °C with a power consumption of 5 W over 7 min. Subsequently, the surface temperature of the PTC-SHT remained constant despite the continued decrease in power consumption. This indicated that heating was accompanied by a

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21

Hong, Ye, Yimin Mo, Juncheng Lv, and Jun Wang. "Tribological Properties of Polymer Friction Improvers Combined with MoDTC/ZDDP at Different Temperatures." Lubricants 11, no. 5 (2023): 196. http://dx.doi.org/10.3390/lubricants11050196.

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To expand the applications of polymer friction modifiers in low viscosity oils suitable for hybrid power systems, the tribological properties of five kinds of oil samples at different temperatures were studied, which were compounded with polymer friction modifiers Perfad XG 2500, molybdenum dialkyl dithiocarbamate (MoDTC), zinc dialkyl dithiophosphate (ZDDP). When Perfad XG 2500 is used alone, it forms a brush-like surface film at low temperatures, which can provide lower initial friction. With the rise in temperature, its antifriction effect decreases significantly, which is related to the de

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22

Shahhath, Ahmed A., Haroun A. K. Shahad, and Alaa A. Mahdi. "Parametric Theoretical Study of Solar Assisted Cooling System Using Lithium Bromide-Water Pair." IOP Conference Series: Earth and Environmental Science 877, no. 1 (2021): 012020. http://dx.doi.org/10.1088/1755-1315/877/1/012020.

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Abstract In this paper, the effect of parameters of solar absorption system such as evaporator, absorber, condenser, generator temperatures and the mass of the solution on the evaporator cooling load and the coefficient of performance has been explained theoretically. The results show that, increasing of evaporator and condenser temperatures increase the evaporator cooling load, performance coefficient and the Ratio of Circulation while increasing the temperature of condenser and absorber decreases the evaporator cooling load, performance coefficient and the Circulation Ratio. In addition, inc

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23

Yamaguchi, Masahito, Jihyun Paek, and Hiroshi Amano. "Thermoelectric Power Measurement of Catalyst-free Si-doped GaAs Nanowires." MRS Proceedings 1439 (2012): 83–87. http://dx.doi.org/10.1557/opl.2012.1326.

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ABSTRACTSi-doped GaAs nanowires (NWs) were grown on (111)Si substrate by MBE-VLS method. The electrical characteristics of the GaAs NWs were measured. A joule heater was arranged near the tip of NW for making the gradient of substrate temperature. The obtained Seebeck coefficient of the GaAs NW increases linearly with a rise in temperature. The thermoelectric power of the Si doped GaAs NW was determined by the hole diffusion. It was estimated that the hole density in the Si-doped GaAs NW at room temperature was 5.9×1018 cm-3 from the slope of the temperature dependence of the Seebeck coefficie

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24

ZAITSEV, SERGEY, and VALENTIN ТIKHENKO. "DIAGNOSIS OF POWER OIL IN PUMPING UNITS COOLING SYSTEMS OF POWER PLANT EQUIPMENT." Herald of Khmelnytskyi National University. Technical sciences 319, no. 2 (2023): 113–19. http://dx.doi.org/10.31891/2307-5732-2023-319-1-113-119.

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The article presents the results of improving the methods for diagnosing the energy oil “Tp-30” of the pumping unit of the NPP equipment coolant circulation system. When studying the physicochemical and thermophysical properties of this oil, it was found that: the indicators “acid number”, “water content”, “content of mechanical impurities”, “content of the additive “Ionol”, “flash point”, “kinematic viscosity” correspond to the established standards. When determining the concentration of the additive “Ionol” in the sample of this oil: the method of adding the additive “Ionol” is used; in the

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25

Balasubramanian, Andi, Venkatesan Jayaraman, Suresh Sivan, and Mariappan Vairavan. "Experimental analysis of triple fluid vapour absorption refrigeration system driven by electrical energy and engine waste heat." Thermal Science 23, no. 5 Part B (2019): 2995–3001. http://dx.doi.org/10.2298/tsci171129110a.

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In this study, performance analysis of absorption refrigeration cycle has been carried out under variable power sources namely electrical and thermal energy sources. The triple fluid vapour absorption system was used in this work. The temperatures at each point in the cycle such as generator, absorber, evaporator and condenser have been measured. The coefficient of performance of the system was calculated and then compared. The results showed that when the cycle driven by electricity, the coefficient of performance varied from 0.28-1.6 along the test time and the generator temperature changed

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26

Fu, Li, and Jing Feng Li. "Preparation and Thermoelectric Properties of LaCoO₃ Ceramics." Key Engineering Materials 434-435 (March 2010): 404–8. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.404.

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LaCoO3 ceramics were prepared by conventional solid state reaction and normal sintering at the temperatures ranging from 1373 to 1523 K. The sintered densities increased with increasing sintering temperature and exceeded 90 % of the theoretical values when sintered above 1473 K. The thermoelectric properties of the samples sintered at different temperatures were investigated from 323 to 673 K. The LaCoO3 samples showed a negative Seebeck coefficient, whose absolute values decreased dramatically with increasing temperature in the range of 323 to 460 K, then changed to a positive value and light

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27

Hu, Zhi Cheng, Zhi Hua Ning, and Le Nian He. "A Low Temperature Coefficient, High Voltage Detection Circuit Used in Power over Ethernet." Advanced Materials Research 588-589 (November 2012): 839–42. http://dx.doi.org/10.4028/www.scientific.net/amr.588-589.839.

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A low temperature coefficient, high voltage detection circuit used in Power over Ethernet is proposed. This circuit realizes the detection comparison without utilizing an extra voltage reference circuit and comparator while the temperature coefficient of the threshold voltage is as low as that of a regular bandgap reference. The proposed detection circuit is implemented in CSMC 0.5μm 60V BCD process, Cadence Spectre simulation results show that the temperature coefficient of the threshold voltage is 66.5 ppm/°C over the temperature range of -40°C to 125°C, and the maximum variation of the thre

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28

Drizdal, Tomas, Gerard C. van Rhoon, Rene F. Verhaart, Ondrej Fiser, and Margarethus M. Paulides. "A Guide for Water Bolus Temperature Selection for Semi-Deep Head and Neck Hyperthermia Treatments Using the HYPERcollar3D Applicator." Cancers 13, no. 23 (2021): 6126. http://dx.doi.org/10.3390/cancers13236126.

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During hyperthermia cancer treatments, especially in semi-deep hyperthermia in the head and neck (H&N) region, the induced temperature pattern is the result of a complex interplay between energy delivery and tissue cooling. The purpose of this study was to establish a water bolus temperature guide for the HYPERcollar3D H&N applicator. First, we measured the HYPERcollar3D water bolus heat-transfer coefficient. Then, for 20 H&N patients and phase/amplitude settings of 93 treatments we predict the T50 for nine heat-transfer coefficients and ten water bolus temperatures ranging from 20

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29

Zhang, Xiu Li, Zhong Wei Yin, Dan Jiang, and Geng Yuan Gao. "Comparison of the Lubrication Performances of Water-Lubricated and Oil-Lubricated Plain Journal Bearings." Applied Mechanics and Materials 711 (December 2014): 27–30. http://dx.doi.org/10.4028/www.scientific.net/amm.711.27.

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Water-lubricated bearings have attracted increasing attention in recent years because of their environmental sustainability, simplified design, low cost, good cooling performance and low coefficient of friction. To show the characteristic of water lubrication more clearly, this paper quantitatively compares the lubrication performances of water-lubrication plain journal bearing and oil-lubricated plain journal bearing using CFD method. Bearing length, friction coefficients, power losses and temperature rises are obtained under the same working condition. Results show that water-lubricated bear

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30

Feier, Ioan, Joseph Way, and Rob Redfield. "Bicycle Disc Brake Thermal Performance: Combining Dynamometer Tests, Bicycle Experiments, and Modeling." Proceedings 49, no. 1 (2020): 100. http://dx.doi.org/10.3390/proceedings2020049100.

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High-power bicycle disc braking can create excessive temperatures and boiling brake fluid, resulting in performance degradation and damage. The goal of this work is to understand brake friction performance and thermal behavior for bicycle disc brakes. A previously described disc braking dynamometer is used to assess brake pad performance of sintered metallic brake pads, organic brake pads, and ‘power’ organic pads in up to 400 W of braking power. The friction coefficient is found to be dependent on both temperature and normal force. Friction curve fits are provided for temperatures between 300

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31

Chamkha, Ali J. "Compressible Dusty-Gas Boundary-Layer Flow Over a Flat Surface." Journal of Fluids Engineering 118, no. 1 (1996): 179–85. http://dx.doi.org/10.1115/1.2817498.

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Equations governing compressible boundary-layer laminar flow of a two-phase particulate suspension are developed based on a continuum representation of both phases. These equations include such effects as particle-phase viscous stresses, variable position-dependent particle slip coefficient, and general power-law viscosity-temperature and thermal conductivity-temperature relations. The dimensionless form of the equations are applied to the problem of flow over a semi-infinite flat surface. An appropriate transformation is employed to allow proper comparison with previously published results fo

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32

Bowen, Zhang, Zhang Xiaoling, Xiong Wenwen, She Shuojie, and Xie Xuesong. "The investigation of the zero temperature coefficient point of power MOSFET." Journal of Semiconductors 37, no. 6 (2016): 064011. http://dx.doi.org/10.1088/1674-4926/37/6/064011.

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Jun, Dongsuk, Soojung Kim, Wonchul Choi, Junsoo Kim, Taehyoung Zyung, and Moongyu Jang. "Silicide/Silicon Hetero-Junction Structure for Thermoelectric Applications." Journal of Nanoscience and Nanotechnology 15, no. 10 (2015): 7472–75. http://dx.doi.org/10.1166/jnn.2015.11148.

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We fabricated silicide/silicon hetero-junction structured thermoelectric device by CMOS process for the reduction of thermal conductivity with the scatterings of phonons at silicide/silicon interfaces. Electrical conductivities, Seebeck coefficients, power factors, and temperature differences are evaluated using the steady state analysis method. Platinum silicide/silicon multilayered structure showed an enhanced Seebeck coefficient and power factor characteristics, which was considered for p-leg element. Also, erbium silicide/silicon structure showed an enhanced Seebeck coefficient, which was

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Bunganaen, Wenseslaus. "Simulasi Termodinamika Pengaruh Temperatur Subcooling di Kondensor Terhadap Kinerja Cold Storage." LONTAR Jurnal Teknik Mesin Undana 9, no. 02 (2022): 40–46. http://dx.doi.org/10.35508/ljtmu.v9i02.9365.

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The subcooling temperature in the condenser can affect the overall performance of the refrigeration system. One of the refrigeration systems that plays an important role in the cold chain of fishery products is cold storage. This paper discusses thermodynamic study of the effect of condenser subcooling temperatures on the performance of cold storage that operates based on a vapor compression refrigeration cycle based on the CoolPack software. The subcooling temperatures varied was 5 – 10 Kelvin and the system performance parameters analyzed were refrigerant mass flow rate, heat rejected in the

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Li, Xiaohui, Jitao Li, Ming Qiao, and Bo Zhang. "Curvature-Compensated Bandgap Voltage Reference with Low Temperature Coefficient." Electronics 13, no. 22 (2024): 4490. http://dx.doi.org/10.3390/electronics13224490.

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Resistance errors in bandgap reference (BGR) circuits often cause deviations in design indicators, and it is true that utilizing various compensation techniques mitigates the impact of resistance errors. In this paper, an original BGR circuit with 180 nm BCD processing is presented, which uses an improved high-order compensation and curvature compensation. The proposed BGR contains four main blocks, including a start-up stage, a first-order temperature compensation stage, a high-order temperature compensation stage, and a curvature compensation stage. Meanwhile, a trimming resistor array struc

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Kazansky, Yury, and Yanis Slekenichs. "Power coefficient of reactivity: definition, interconnection with other coefficients of reactivity, evaluation of results of transients in power nuclear reactors." Nuclear Energy and Technology 4, no. 2 (2018): 111–18. http://dx.doi.org/10.3897/nucet.4.30663.

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It is assumed by the authors of the present paper that with growing contribution of nuclear power in the production of electricity, nuclear power plants will be used to a higher degree in a manoeuvrable mode of operation rather than in the base-load mode. In other words, change of power from the nominal level to that of coverage of auxiliary loads will be becoming quite common and not so rare event as scheduled reactor shutdowns for fuel reloading or preventive works. There exist well-known problems in the use of nuclear reactors in the manoeuvrable operation mode, which include the task share

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Filippou, Antria, Nikolas Evripidou, Andreas Georgiou, Anastasia Nikolaou, and Christakis Damianou. "Estimation of the Proton Resonance Frequency Coefficient in Agar-based Phantoms." Journal of Medical Physics 49, no. 2 (2024): 167–80. http://dx.doi.org/10.4103/jmp.jmp_146_23.

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Aim: Agar-based phantoms are popular in high intensity focused ultrasound (HIFU) studies, with magnetic resonance imaging (MRI) preferred for guidance since it provides temperature monitoring by proton resonance frequency (PRF) shift magnetic resonance (MR) thermometry. MR thermometry monitoring depends on several factors, thus, herein, the PRF coefficient of agar phantoms was estimated. Materials and Methods: Seven phantoms were developed with varied agar (2, 4, or 6% w/v) or constant agar (6% w/v) and varied silica concentrations (2, 4, 6, or 8% w/v) to assess the effect of the concentration

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Liu, Junchao, and Xiaocha Wang. "Design of a High PSRR Low-pressure Bandgap Reference Source with Curvature Compensation." Journal of Physics: Conference Series 2625, no. 1 (2023): 012078. http://dx.doi.org/10.1088/1742-6596/2625/1/012078.

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Abstract Based on the NUVOTON 0.35 μm BCD process, a low voltage bandgap reference with an input voltage of 5 V and output voltage of 0.6 V is designed in this paper. The traditional low-voltage bandgap reference output voltage has a large temperature coefficient and poor ability to suppress power supply fluctuations. In this paper, a circuit with high order compensation is proposed to reduce the temperature coefficient of the circuit, and a pre-regulated circuit is used to increase the power supply rejection ratio. The simulation results are at -30 °C∼130 °C. The output voltage of reference v

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Onaolapo, A. K., R. Sarma, K. T. Akindeji, N. F. Mtukushe, A. O. Aluko, and T. Adefarati. "Effect of Temperature Coefficient Evaluation on Optimal Analysis of Hybrid Energy Systems for a Mall in KwaZulu-Natal, South Africa." NIPES - Journal of Science and Technology Research 7, no. 3 (2025): 185–94. https://doi.org/10.37933/nipes/7.3.2025.1629.

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Suitable technical sizing of a standalone off-grid power system impacts its economic and technical analysis. This research examines the effect of the temperature coefficient to determine the optimal analysis of a standalone off-grid power system considering the case of a standard mall in KwaZulu-Natal, South Africa, during the crucial 2021 wave of load shedding. Scenarios without temperature coefficients and vice versa were also analyzed for comparison purposes. The system was modeled in a MATLAB environment for optimum component configuration. The analyses showed that the presence of a temper

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Жуков, В. П., та Е. В. Чулков. "Электронная зонная структура и термоэлектрические характеристики SrTiO-=SUB=-3-=/SUB=-, BaTiO-=SUB=-3-=/SUB=- и CaTiO-=SUB=-3-=/SUB=-: ab initio подход". Физика твердого тела 64, № 12 (2022): 1891. http://dx.doi.org/10.21883/ftt.2022.12.53638.383.

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The calculations of Seebeck’s coefficient, conductivity and power functions for the electron-doped SrTiO_3, BaTiO_3 and CaTiO_3 compounds have been performed depending on temperature and current carrier concentration by employing ab initio method based on the electron density functional theory, on the Frohlich’s approach for the electron-phonon interaction and on the theory of Boltzmann–Onsager for the thermoelectric properties. The calculated Seebeck’s coefficient and conductivity correspond to experimental data. It is shown that for SrTiO_3 and BaTiO_3 the dependencies of power functions on

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Zhukov V. P. and Chulkov E. V. "Electronic band structure and thermoelectric properties of SrTiO-=SUB=-3-=/SUB=-, BaTiO-=SUB=-3-=/SUB=- and CaTiO-=SUB=-3-=/SUB=-: ab initio approach." Physics of the Solid State 64, no. 12 (2022): 1855. http://dx.doi.org/10.21883/pss.2022.12.54377.383.

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The calculations of Seebeck's coefficient, conductivity and power functions for the electron-doped SrTiO3, BaTiO3 and CaTiO3 compounds have been performed depending on temperature and current carrier concentration by employing ab initio method based on the electron density functional theory, on the Frohlich's approach for the electron-phonon interaction and on the theory of Boltzmann--Onsager for the thermoelectric properties. The calculated Seebeck's coefficient and conductivity correspond to experimental data. It is shown that for SrTiO3 and BaTiO3 the dependencies of power functions on the

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SUHA H. IBRAHEEM,. "Effect of Laser annealing on structural and thermoelectric properties of SnSe thin films." journal of the college of basic education 28, no. 115 (2022): 1–9. http://dx.doi.org/10.35950/cbej.v28i115.5828.

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This study adopted the flash evaporation technique to prepare SnSe thin films onto glass substrates kept at room temperature. The effect of CO2 laser annealing on the structural properties and thermoelectric characterizations of SnSe films was investigated in power annealing (10 W) at (10,15,20 Min). Morphologies and structures of the crystalline were determined using an atomic force microscope and X-ray diffraction. Power factor, electrical conductivity, and the Seebeck coefficients were determined. The results demonstrated that the power factor and the Seebeck coefficient were enhanced as th

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Unyanin, Alexander N., and Pavel R. Finageev. "Research of the Influence of Cutting Conditions on the Temperature Field during Turning." Key Engineering Materials 910 (February 15, 2022): 271–77. http://dx.doi.org/10.4028/p-l205d1.

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Numerical simulation of the temperature field and parameters of the turning process of workpieces made of 45 and 12Kh18N10T steels is performed. The front angle of the cutter, as well as the coefficients of chip friction on the front surface of the tool μ1, the flank surface on the workpiece μ2, and the coefficient of friction on the yield stress μ were selected as variable parameters. The degree of influence of the variable parameters on the tangential component of the cutting force, the friction force on the front and flank surfaces of the cutting tool, the power of heat sources, contact tem

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Sun, Sheng-Wei, and Xian-Fang Li. "Exact solution of a nonlinear fin problem of temperature-dependent thermal conductivity and heat transfer coefficient." Canadian Journal of Physics 98, no. 7 (2020): 700–712. http://dx.doi.org/10.1139/cjp-2019-0435.

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This paper studies a class of nonlinear problems of convective longitudinal fins with temperature-dependent thermal conductivity and heat transfer coefficient. For thermal conductivity and heat transfer coefficient dominated by power-law nonlinearity, the exact temperature distribution is obtained analytically in an implicit form. In particular, the explicit expressions of the fin temperature distribution are derived explicitly for some special cases. An analytical expression for fin efficiency is given as a function of a thermogeometric parameter. The influences of the nonlinearity and the th

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Cui, Yun Xian, Yang An, Jia Hui Zhao, and Xiao Xing Sheng. "Research on Seebeck Coefficient of Thin-Film Thermocouple on Temperature-Testing Cutter." Applied Mechanics and Materials 757 (April 2015): 139–46. http://dx.doi.org/10.4028/www.scientific.net/amm.757.139.

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Performance of current temperature sensor is not satisfactory on monitoring transient temperature of cutting edge. A temperature-testing cutter is presented in this paper and analysis of Seebeck coefficient on thin film thermocouple is proposed with experiments. Thin film thermocouple is embedded into the cutting edge using magnetron sputtering technology. According to the fact that electrical conductivity can be replaced by the multiplication of electron mean free path λ and effective Fermi surface area A, a universal formula of thermoelectric power is given based on the diffuse thermoelectri

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ZHU, ZHANGMING, WEI WEI, LIANXI LIU, and YINTANG YANG. "A HIGH PRECISION CMOS VOLTAGE REFERENCE WITHOUT RESISTORS." Journal of Circuits, Systems and Computers 21, no. 03 (2012): 1250019. http://dx.doi.org/10.1142/s0218126612500193.

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With the application of the voltage divider to the traditional bandgap reference without resistors, a high precision CMOS voltage reference without resistors has been proposed. The temperature coefficient has improved because the divider introduces the temperature compensation. The output reference voltage is 410.39 mV at the room temperature. The temperature coefficient of the voltage reference is 3.02 ppm/°C in the range from -20°C to 120°C. Moreover, the power supply rejection ratio of the voltage reference is -52.6 dB and the power consumption is 5.61 μW.

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Van Der Veen, C. J., and K. C. Jezek. "Seasonal variations in brightness temperature for central Antarctica." Annals of Glaciology 17 (1993): 300–306. http://dx.doi.org/10.3189/s0260305500013008.

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The radiative-transfer model developed by Zwally (1977) is modified and coupled to a one-dimensional time-dependent temperature model, to calculate the seasonal variation in brightness temperature. By comparing this with observed records, the radiative properties of firn can be determined. By retaining scattering as a source term in the radiative transfer function, agreement between model-derived scattering and absorption coefficients and those calculated from the Mie/Rayleigh scattering theory can be obtained. The horizontal brightness temperature is not linked to the vertical one through a c

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Van Der Veen, C. J., and K. C. Jezek. "Seasonal variations in brightness temperature for central Antarctica." Annals of Glaciology 17 (1993): 300–306. http://dx.doi.org/10.1017/s0260305500013008.

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The radiative-transfer model developed by Zwally (1977) is modified and coupled to a one-dimensional time-dependent temperature model, to calculate the seasonal variation in brightness temperature. By comparing this with observed records, the radiative properties of firn can be determined. By retaining scattering as a source term in the radiative transfer function, agreement between model-derived scattering and absorption coefficients and those calculated from the Mie/Rayleigh scattering theory can be obtained. The horizontal brightness temperature is not linked to the vertical one through a c

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Ndlovu, Partner L., and Raseelo J. Moitsheki. "Analytical Solutions for Steady Heat Transfer in Longitudinal Fins with Temperature-Dependent Properties." Mathematical Problems in Engineering 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/273052.

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Explicit analytical expressions for the temperature profile, fin efficiency, and heat flux in a longitudinal fin are derived. Here, thermal conductivity and heat transfer coefficient depend on the temperature. The differential transform method (DTM) is employed to construct the analytical (series) solutions. Thermal conductivity is considered to be given by the power law in one case and by the linear function of temperature in the other, whereas heat transfer coefficient is only given by the power law. The analytical solutions constructed by the DTM agree very well with the exact solutions eve

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Lee, Min Chin, Ming Chia Hsie, and Chi Jing Hu. "Implementation of Low Bandgap Reference Voltage Circuit for Power Management Applications." Advanced Materials Research 562-564 (August 2012): 1517–21. http://dx.doi.org/10.4028/www.scientific.net/amr.562-564.1517.

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This paper proposes a low bandgap reference voltage circuit with low temperature coefficient and independent of suply voltage for applications to power management IC. This proposed circuit is design and implemented using the TSMC 0.35μm CMOS 2P4M process. Based on simulated and measured results , the chip size is 20.6000.680mm with power dissipation about 3.3mW, and the operation temperature range form 0Cto 100C with temperature coefficient about 9.29/ppmC. The chip suply voltage can from 2.9V to 3.3V with PSRR about 44.2 dB, and its output reference voltage can stable at 0.65V.

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