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Perioperative Acute Kidney Injury: Implications, Approach, Prevention. 围手术期急性肾损伤：意义、方法和预防。
IF 1.1 4区 工程技术
Thermal Science Pub Date : 2023-12-01 Epub Date: 2023-07-19 DOI: 10.1016/j.aan.2023.06.005
Aditi Balakrishna, Jeremy Walco, Frederic T Billings, Marcos G Lopez
{"title":"Perioperative Acute Kidney Injury: Implications, Approach, Prevention.","authors":"Aditi Balakrishna, Jeremy Walco, Frederic T Billings, Marcos G Lopez","doi":"10.1016/j.aan.2023.06.005","DOIUrl":"10.1016/j.aan.2023.06.005","url":null,"abstract":"<p><p>Acute kidney injury remains a common and significant contributor to perioperative morbidity. Acute kidney injury worsens patient outcomes, and anesthesiologists should make significant efforts to prevent, assess, and treat perioperative renal injury. The authors discuss the impact of renal injury on patient outcomes and putative underlying mechanisms, evidence underlying treatments for acute kidney injury, and practices that may prevent the development of perioperative renal injury.</p>","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"1 1","pages":"205-224"},"PeriodicalIF":1.1,"publicationDate":"2023-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11079993/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90193259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental investigation of the effect of the use of nanoparticle additional biodiesel on fuel consumption and exhaust emissions in tractor using a coated engine 使用纳米颗粒附加生物柴油对使用涂层发动机的拖拉机燃料消耗和废气排放影响的实验研究
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2304189o
Salih Ozer, Fatih Haciyusufoglu, Erdinc Vural
{"title":"Experimental investigation of the effect of the use of nanoparticle additional biodiesel on fuel consumption and exhaust emissions in tractor using a coated engine","authors":"Salih Ozer, Fatih Haciyusufoglu, Erdinc Vural","doi":"10.2298/tsci2304189o","DOIUrl":"https://doi.org/10.2298/tsci2304189o","url":null,"abstract":"This study focuses on reducing the fuel consumption and exhaust gas emission values of the tractor used in the agricultural field. With the additive added to the fuel and the coating of the tractor engine, the fuel consumption values were reduced, and agricultural production costs were tried to be reduced. On the other hand, exhaust emission values were also tried to be reduced and thus a more environmentally friendly production method was aimed to be adopted. For this reason, the cylinders of the tractor engine were coated with Al2O3 + 13%TiO2 metal powders mixed by mass using the plasma spray method. All experiments were repeated by attaching these coated pistons to the engine. The fuel used in the experiments was purchased from a commercial company and the nanoparticle (molybdenum) additive was added to the biodiesel at the rates of 25 ppm, 50 ppm, 100 ppm, and 200 ppm by mass. The fuel mixtures obtained in the coated and uncoated engine, when the engine is in the full throttle position, using the PTO load test unit at 1000 rpm, 1200 rpm, 1400 rpm, 1600 rpm, 1800 rpm, and 2000 rpm. It has been tested by loading at 2200 rpm, 2400 rpm, and 2600 rpm engine speeds. Code for the Official Testing of Agricultural and Forestry Tractor Performance standards were adhered to during all engine tests. The results showed that coating the cylinders and adding nanoparticles into biodiesel reduces the fuel consumption value, increases the exhaust gas temperature, decreases HC, CO, and PM emissions, and increases NOx emissions.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"119 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical simulation of slip behaviors and friction reduction effects in hydrophobic micro-channel in laminar flow conditions 层流条件下疏水微通道滑移行为及减摩效应的数值模拟
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2304405d
Bekir Dogan, Mustafa Ozbey, Lutfu Namli, Unsal Aybek
{"title":"Numerical simulation of slip behaviors and friction reduction effects in hydrophobic micro-channel in laminar flow conditions","authors":"Bekir Dogan, Mustafa Ozbey, Lutfu Namli, Unsal Aybek","doi":"10.2298/tsci2304405d","DOIUrl":"https://doi.org/10.2298/tsci2304405d","url":null,"abstract":"In the study, a numerical simulation of the sliding properties of the rough and smooth surfaces with micro-structure was made. The simulation of shear flow in the micro-channel was performed with ANSYS FLUENT software. The 3-D and two-phase flow is simulated by choosing the volume of fluid model. In CFD analysis, water and air consist of two immiscible phases. In the calculations, if water is the first fluid and air is the second fluid, adjustments are made. At the beginning of the analysis, the channel was considered to be completely filled with air and the effect of gravity was ignored during the calculation. Water and air are considered Newtonian and incompressible fluids. In addition, laminar flow and steady-state calculations are made. It was found that the decrease in pressure drop increased with increasing distance between asperities (no-shear fraction). In the simulation results, approximately 14% of the velocity in the micro-channel axis was measured at the interface. The main purpose of this study is to evaluate the applicability of the volume of fluid model in a hydrophobic micro-channel flow designed in 3-D using ANSYS Fluent CFD software.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"242 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Artificial neural network assisted multi-objective optimization of a methane-fed DIR-SOFC system with waste heat recovery 人工神经网络辅助下的带余热回收的甲烷供气DIR-SOFC系统多目标优化
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2304413a
Unsal Aybek, Lutfu Namli, Mustafa Ozbey, Bekir Dogan
{"title":"Artificial neural network assisted multi-objective optimization of a methane-fed DIR-SOFC system with waste heat recovery","authors":"Unsal Aybek, Lutfu Namli, Mustafa Ozbey, Bekir Dogan","doi":"10.2298/tsci2304413a","DOIUrl":"https://doi.org/10.2298/tsci2304413a","url":null,"abstract":"The main purpose of this study is to enhance the performance of solid oxide fuel cell systems. For this purpose, a mathematical model of a direct internal reforming (DIR) methane-fed solid oxide fuel cell system with waste heat recovery was designed in the engineering equation solver program. We optimised the performance of the solid oxide fuel cell using a genetic algorithm and TOPSIS technique considering exergy, power, and environmental analyzes. An ANN working with the Levenberg-Marquardt training function was designed in the MATLprogram to create the decision matrix to which the TOPSIS method will be applied. According to the power optimization, 786 kW net power was obtained from the system. In exergetic optimization, the exergy efficiency was found to be 57.6%. In environmental optimization, the environmental impact was determined as 330.6 kgCO2/MWh. According to the multi-objective optimization results, the exergy efficiency, the net power of the solid oxide fuel cell system, and the environmental impact were 504.1 kW, 40.08%, and 475.4 kgCO2/MWh.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135440755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nine-parameter path synthesis of planar four-bar mechanism with the aid of the general equation of coupler curve 基于连杆曲线一般方程的平面四杆机构九参数轨迹综合
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci2304349m
Huseyin Mutlu
{"title":"Nine-parameter path synthesis of planar four-bar mechanism with the aid of the general equation of coupler curve","authors":"Huseyin Mutlu","doi":"10.2298/tsci2304349m","DOIUrl":"https://doi.org/10.2298/tsci2304349m","url":null,"abstract":"The design of a four-bar mechanism to generate a prescribed path with minimal error is possible by using the maximum number of parameters that are effective in the path synthesis of the mechanism. In this study, the design of four-bar mechanisms, which intersect the given path curve at nine points, was dealt with in two stages. In the first step, the kinematic equations of the mechanism were used to implement the preliminary design based on the five parameters and closed-form solving. Thus, all the possible solution values have been reached with five parameters. In the second stage, which is the final design, the general algebraic form of coupler curve, which is dependent on the nine dimensions of the mechanism and of the sixth order, was obtained. An objective function de-rived from the obtained equation is subjected to an optimization process with nine-parameters by using the dimensions obtained from the preliminary design as an initial value, and the error between the actual and the desired path is minimized. The efficiency of the method is shown by numerical example made by choosing difficult paths to produce four-bar mechanisms.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135441007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Investigation of velocity distribution in channels and chambers of the electrostatic precipitator at TPP Nikola Tesla Unit A1 TPP尼古拉特斯拉A1单元静电除尘器通道和室内速度分布的研究
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230816244m
Zoran Markovic, Milic Eric, Predrag Stefanovic, Ivan Lazovic, Aleksandar Milicevic, Marko Mancic, Milica Jovcevski, Rastko Jovanovic
{"title":"Investigation of velocity distribution in channels and chambers of the electrostatic precipitator at TPP Nikola Tesla Unit A1","authors":"Zoran Markovic, Milic Eric, Predrag Stefanovic, Ivan Lazovic, Aleksandar Milicevic, Marko Mancic, Milica Jovcevski, Rastko Jovanovic","doi":"10.2298/tsci230816244m","DOIUrl":"https://doi.org/10.2298/tsci230816244m","url":null,"abstract":"To achieve the optimum dust removal performance of an electrostatic precipitator, the flue gas should be distributed uniformly over its vertical cross-section. The flow in the upstream flue gas ducts has a significant influence on the downstream gas distribution in the chamber of the precipitator. This paper presents the results of homogeneity assessment of velocity distribution in the ducts and vertical cross-sections of the electrostatic precipitator of unit A1 at the Nikola Tesla thermal power plant in Obrenovac. The measurements confirmed that the reconstruction of the vertical chamber at the front of the precipitator, which was carried out during the overhaul in 2020, effectively solved the problem of the original asymmetric arrangement of the vertical flue gas ducts. Nevertheless, the analysis revealed poor homogeneity of the flow field through the chambers. Therefore, additional measures must be taken to increase the dust removal efficiency of the precipitator.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135502492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Corrigendum: Marangoni convection of nanofluid in a wavy trapezoidal enclosure 勘误:波纹梯形外壳中纳米流体的马兰戈尼对流
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230918192e
E Editorial
{"title":"Corrigendum: Marangoni convection of nanofluid in a wavy trapezoidal enclosure","authors":"E Editorial","doi":"10.2298/tsci230918192e","DOIUrl":"https://doi.org/10.2298/tsci230918192e","url":null,"abstract":"Simeon Oka, Editor-in-Chief Emeritus of the journal Thermal Science request that it is, due to request of the Corresponding author of this paper, necessary to correct Acknowledgement of the paper MARANGONI CONVECTION OF NANOFLUID IN A WAVY TRAPEZOIDAL ENCLOSURE written by Sharifah Nuriza Binti Syed Muhammad Naquib AL?AIDRUSa, Zailan Bin SIRIa*, and Mohd Nashrul Bin Mohd ZUBIRb a Institute of Mathematical Sciences, University Malaya, Kuala Lumpur, Malaysia b Department of Mechanical Engineering, University Malaya, Kuala Lumpur, Malaysia Original scientific paper https://doi.org/10.2298/TSCI21S2339A published in the journal Thermal Science, Vol. 25, Year 2021, Special issue 2, pp. S339-S345 since due to change regulations accepted by Government of Malaysia Condolement should have different and more detailed form. Instead of: ACKNOWLEDGEMENT This paper is part of a research project supported by the Malaysian Ministry of Higher Education Fundamental Research Grant no. FP068-2020. The authors would also like to express their thanks to the University of Malaya for supporting this research under grant no. IIRG006C19IISS. has to be written: Acknowledgment The work is supported financially by the Ministry of Higher Education Malaysia via Fundamental Research Grant Scheme (FRGS/1/2020/STG06/UM/02/4) and Impact Oriented Interdisciplinary Research Grant No. IIRG006C-19IISS. <br><br><font color=\"red\"><b> Link to the corrected article <u><a href=\"http://dx.doi.org/10.2298/TSCI21S2339A\">10.2298/TSCI21S2339A</a></b></u>","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135556369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal recovery test for determining the thermal conductivity of the soil 测定土壤导热性的热恢复试验
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230825223v
Marija Vasilev, Milos Banjac
{"title":"Thermal recovery test for determining the thermal conductivity of the soil","authors":"Marija Vasilev, Milos Banjac","doi":"10.2298/tsci230825223v","DOIUrl":"https://doi.org/10.2298/tsci230825223v","url":null,"abstract":"This paper presents a new in-situ experimental procedure for determining a thermal conductivity of soil, as one of the thermophysical properties necessary for dimensioning vertical buried heat exchangers of geothermal heat pumps. The proposed method, called the Thermal Recovery Test, is based on the assumption that there is a direct analogy between the hydrodynamic process of filling (recovery) the well with water from a porous aquifer after its partial or complete discharging and the process of establishment of thermal equilibrium in an infinite medium previously disturbed by a line heat sink (source). Apart from presentation the theoretical background of these two phenomena, the display of the identical theoretical logarithmic character of the change of hydrostatic pressure and soil temperature, description of the experimental procedure, the experimental results of three performed experiments are also presented. Additionally, results for the experimentally obtained values of the thermal conductivity of the soil are compared with those obtained from the Thermal Response Test, and the advantages and drawbacks of the new Thermal Recovery Test method are analyzed.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136305465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study on the effect of width and slope of large cross-section tunnel on critical velocity of fire 大断面隧道宽度和坡度对临界火速的影响研究
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230328195s
Su Liu
{"title":"Study on the effect of width and slope of large cross-section tunnel on critical velocity of fire","authors":"Su Liu","doi":"10.2298/tsci230328195s","DOIUrl":"https://doi.org/10.2298/tsci230328195s","url":null,"abstract":"when a tunnel fire occurs, due to the difference of tunnel width and slope, both smoke countercurrent length distribution law and critical velocity will become different, and these two are very important parameters in tunnel longitudinal ventilation design. Therefore, for the design of smoke control and longitudinal ventilation of the tunnel, based on actual highway tunnel size, this paper established and ran a series of numerical simulations through FDS simulation software to study tunnel width and slope?s effect on smoke countercurrent length and critical velocity. The results of this paper show that smoke countercurrent length decreases with tunnel slope?s increase and increases with tunnel width?s increase. Through dimensionless analysis, the prediction formulas of smoke countercurrent length and critical wind speed of large cross-section tunnel about tunnel width, slope and height are modified and established. The research conclusions can provide a theoretical basis for the longitudinal ventilation design, smoke prevention and exhaust measures and personnel evacuation in large cross-section tunnel fires.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136002734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Experimental and numerical investigation of Rayleigh-Bénard convection in rectangular cavity with motor oil 加机油的矩形腔内瑞利-巴程纳德对流的实验与数值研究
4区 工程技术
Thermal Science Pub Date : 2023-01-01 DOI: 10.2298/tsci230607216z
Predrag Zivkovic, Mladen Tomic, Sadoon Ayed, Cristian Barz, Drago Sever
{"title":"Experimental and numerical investigation of Rayleigh-Bénard convection in rectangular cavity with motor oil","authors":"Predrag Zivkovic, Mladen Tomic, Sadoon Ayed, Cristian Barz, Drago Sever","doi":"10.2298/tsci230607216z","DOIUrl":"https://doi.org/10.2298/tsci230607216z","url":null,"abstract":"Naturally flows have been the scope of the scientific research for centuries, Rayleigh-B?nard convection being one of the leading. Many researchers have considered the flow patterns, boundary conditions, various cavities, nanofluids, theoretically, numerically, experimentally. The flow was investigated in atmosphere and in nano fluids, in air, water, molten metals, non - Newtonian fluids. Almost all research focuses on 2 or 3 - dimensional analysis of flow in laterally unlimited enclosures, as parallel plates or coaxial cylinders. In technical practice, only limited enclosures exist. This paper presents numerical and real experimental results for the test chamber with ratio 4?2?1 in x, y and z direction, respectfully. The measurements were taken at fifteen different positions on the faces of the tank. Probes used are PT100 elements. As the chamber is limited in all directions, the results have shown strong influence of the lateral walls. The results are compared with the those obtained by IR camera. Various fluids were tested, and results for motor oil will be presented.","PeriodicalId":23125,"journal":{"name":"Thermal Science","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136002984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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