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Journal articles on the topic 'Sum of thermal units'

Author: Grafiati

Published: 4 June 2025

Last updated: 1 August 2025

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1

Svitlana, Kalenska, and Ryzhenko Anatolii. "EVALUATION WEATHER CONDITIONS FOR GROWING SUNFLOWER (HELIANTHUS ANNUUS L.) IN THE NORTHERN PART OF THE LEFT-BANK FOREST STEPPE OF UKRAINE." Plant varieties studying and protection 16, no. 2 (2020): 162–72. https://doi.org/10.21498/2518-1017.16.2.2020.209229.

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<strong>Pourpose</strong>. Establish compliance of heat and moisture resources to biological requirements of sunflower hybrids (<em>Helianthus annuus</em>), reveal criteria for assessing weather conditions in the northern regions of Ukraine; establish links between temperature, precipitation and yield. <strong>Methods</strong>. Field and mathematical methods were used. Field multifactorial experiment was conducted during 2016–2018 in the Left Bank of Ukraine, on the border of two soil and climatic zones of Ukraine - Forest-Steppe and Polissya. Peculiarities of plant growth and developmen

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Wilson, Thad E., and Chester A. Ray. "Effect of thermal stress on the vestibulosympathetic reflexes in humans." Journal of Applied Physiology 97, no. 4 (2004): 1367–70. http://dx.doi.org/10.1152/japplphysiol.00403.2004.

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Both heat stress and vestibular activation alter autonomic responses; however, the interaction of these two sympathetic activators is unknown. To determine the effect of heat stress on the vestibulosympathetic reflex, eight subjects performed static head-down rotation (HDR) during normothermia and whole body heating. Muscle sympathetic nerve activity (MSNA; peroneal microneurography), mean arterial blood pressure (MAP), heart rate (HR), and internal temperature were measured during the experimental trials. HDR during normothermia caused a significant increase in MSNA (Δ5 ± 1 bursts/min; Δ53 ±

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Nguyen, Thang Trung, Nguyen Vu Quynh, and Le Van Dai. "Improved Firefly Algorithm: A Novel Method for Optimal Operation of Thermal Generating Units." Complexity 2018 (July 9, 2018): 1–23. http://dx.doi.org/10.1155/2018/7267593.

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This paper presents a novel improved firefly algorithm (IFA) to deal the problem of the optimal operation of thermal generating units (OOTGU) with the purpose of reducing the total electricity generation fuel cost. The proposed IFA is developed based on combining three improvements. The first is to be based on the radius between two solutions, the second is updated step size for each considered solution based on different new equations, and the third is to slightly modify a formula producing new solutions by using normally distributed random numbers and canceling uniform random numbers of conv

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4

Ballirano, Paolo. "Thermal behaviour of alum-(K) KAl(SO4)2·12H2O from in situ laboratory high-temperature powder X-ray diffraction data: thermal expansion and modelling of the sulfate orientational disorder." Mineralogical Magazine 79, no. 1 (2015): 157–70. http://dx.doi.org/10.1180/minmag.2015.079.1.13.

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AbstractThe present work analyses the thermal behaviour of alum-(K), KAl(SO4)2·12H2O, by in situ laboratory high-temperature powder X-ray diffraction data from 303 K to melting, which starts at 355 K and is completed, due to kinetics, at 359 K. The calculated a0 linear thermal expansion coefficient is of 14.68(11) × 10–6 K–1 within the investigated thermal range. The k disorder parameter, describing the extension of the orientational disorder of the sulfate group, has been found to decrease from ∼0.70 to ∼0.65 just before melting. It has been demonstrated that the occurrence of the disorder im

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Zhang, Niu, Ming-Yi Wu, Ya-Ming Liu, Meng-Jie Yang, Ming-Ju Chao, and Er-Jun Liang. "Enhanced Negative Thermal Expansion Property Deduced by the Breaks of Superstructure." Science of Advanced Materials 13, no. 4 (2021): 556–62. http://dx.doi.org/10.1166/sam.2021.3965.

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The HfV2O7/HfMo2O8 composite were prepared in situ. The phase, structure and thermal expansion property were analyzed. The results indicate the composite consist of cubic HfV2O7 and hexagonal HfMo2O8. The two types of structures were coexisted and mixed uniformly, and interacted with each other. The mutual nested structure suppressed the formation of 3×3×3 superstructure in HfV2O7 (RT) introduced by the reaction in situ. The promoted coupled rotation of quasi-rigid polyhedron units could enhance the negative thermal expansion (NTE) property. The HfV2O7/HfMo2O8 composite exhibits excellent NTE

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Salkuti, Surender Reddy. "Solving combined economic emission dispatch problem in wind integrated power systems." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 2 (2021): 635–41. https://doi.org/10.11591/ijeecs.v21.i2.pp635-641.

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A meta-heuristic based optimization method for solving combined economic emission dispatch (CEED) problem for the power system with thermal and wind energy generating units is proposed in this paper. Wind energy is environmentally friendly and abundantly available, but the intermittency and variability of wind power affects the system operation. Therefore, the system operator (SO) must aware of wind forecast uncertainty and dispatch the wind power accordingly. Here, the CEED problem is solved by including the nonlinear characteristics of thermal generators, and the stochastic behavior of wind

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7

Kalenska, S. M., and R. V. Hovenko. "Productivity of corn as affected by the accumulation of heat units and different nitrogen fertilizers." Scientific Papers of the Institute of Bioenergy Crops and Sugar Beet, no. 30 (December 26, 2022): 33–43. http://dx.doi.org/10.47414/np.30.2022.268943.

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Purpose. To establish the effectiveness of the application of different fertilizers in corn cultivation technologies in the Left Bank Forest Steppe of Ukraine, depending on the weather conditions of the years of research. Methods. Field research was conducted in the years 2019–2021 in dark grey podzolized soil. The results of the study were calculated using the SAS 9.4 software package. Analysis of variance was performed using the Duncan rank criterion. Results. Calculations of the accumulation of heat units showed a significant difference by year, which largely determined the leve

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Salkuti, Surender Reddy. "Solving combined economic emission dispatch problem in wind integrated power systems." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 2 (2021): 635. http://dx.doi.org/10.11591/ijeecs.v21.i2.pp635-641.

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<p>A meta-heuristic based optimization method for solving combined economic emission dispatch (CEED) problem for the power system with thermal and wind energy generating units is proposed in this paper. Wind energy is environmentally friendly and abundantly available, but the intermittency and variability of wind power affects the system operation. Therefore, the system operator (SO) must aware of wind forecast uncertainty and dispatch the wind power accordingly. Here, the CEED problem is solved by including the nonlinear characteristics of thermal generators, and the stochastic behavior

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Dianingrum, Anita, Raka Mahendra Sulistiyo, Pratiwi Anjar Sari, and Salwa Rahmanisa. "The influence of openings on thermal comfort in the residential units of Sub-Communal RISHA, Mojo Surakarta." IOP Conference Series: Earth and Environmental Science 1438, no. 1 (2025): 012081. https://doi.org/10.1088/1755-1315/1438/1/012081.

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Abstract Temporary Housing Sub-Communal RISHA (Healthy Simple Instant House) is a temporary housing facility located in Surakarta, one of the housing development solutions for slum settlements. Sub-Communal RISHA was built to provide housing for residents affected by the development of the Bengawan Solo Riverbanks. This study was conducted to identify the effect of openings on the thermal comfort of the space in residential units and provide a recommendation to improve thermal comfort as an adaptation to environmental conditions affected by global warming. With a relatively small residential u

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Tariq, Saiful Hasan, M. Arefeen Ibrahim, Ashik Vaskor Mannan, and Ajmeri Nusrat Shoma. "Transforming Slum Dwellings into Better Livable Units: An Approach through Minimum Intervention." AIUB Journal of Science and Engineering (AJSE) 22, no. 1 (2023): 24–34. http://dx.doi.org/10.53799/ajse.v22i1.300.

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Urban migration is becoming an increasing issue in the cities in Bangladesh. Since the migrants are mostly poverty affected, they have no other opportunity than to move to urban slums, where, there is no decent infrastructure. The high density of built-forms and lack of understanding about ventilation strategies and thermal insulation are some of the reasons for their sufferings during the summer and winter months. The constant need for health treatment, infrastructure repairing, increasing utility bills due to lack of daylight and ventilation are affecting their extremely marginal economic co

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Kostikov, Andrii O., Oleksandr L. Shubenko, Viktoriia O. Tarasova, Viktor A. Yakovliev, and Andrii O. Mazur. "Ways of TPP Power Units Modernization During Their Conversion to Ultra-Supercritical Steam Parameters." Journal of Mechanical Engineering 26, no. 4 (2023): 6–16. http://dx.doi.org/10.15407/pmach2023.04.006.

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The approach to solving the applied problem of modernization of the 300 MW series power units produced by JSC "Ukrainian Energy Machines" by converting them from supercritical to ultra-supercritical steam parameters, provided that regenerative feed water heating system is preserved as much as possible, which will lead to an increase in the energy efficiency of the TPP with minimal conversion, is analyzed in the paper. The conversion of the K-300-240-2 power unit to the parameters of fresh steam 650 °C/30 MPa and intermediate superheated steam 650 °C/7 MPa, determined as optimal as a result of

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Lorusso, Felice, Sergio Alexandre Gehrke, Felice Festa, and Antonio Scarano. "Wearing Effect of Implant Steel Drills and Tappers for the Preparation of the Bone Osteotomies: An Infrared Thermal Analysis and Energy Dispersive Spectroscopy-Scanning Electron Microscopy (EDS-SEM) Study." Prosthesis 4, no. 4 (2022): 679–94. http://dx.doi.org/10.3390/prosthesis4040054.

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Background: The thermal effect correlated with implant osteotomy could produce significant effects on the healing process and fixture osseointegration. The aim of the present investigation was to assess the heat generation and surface wearing of dental implant drills and manual tappers during simulated osteotomies on animal ribs. Methods: Steel drills (20 units per type) and tappers (20 units per type) were evaluated for a total of 30 osteotomies. The infrared thermal analysis was performed at the first and thirtieth osteotomy. The surface alteration and wearing was assessed by energy dispersi

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Malyavina, Elena, and Alexander Lomakin. "Load on the air conditioning system in a room with non-round-the-clock working day in the warm season." E3S Web of Conferences 135 (2019): 03018. http://dx.doi.org/10.1051/e3sconf/201913503018.

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Calculations of the maximum load on the cooling units of air conditioning systems are important, as they determine the installation capacity of an air conditioner. The load value is influenced by the share of the radiant component in the sum of heat gains coming into a room and making up the load, and the internal thermal stability of the room. Herewith, as the theory of thermal stability states, the higher the internal resistance, the smoother the load peaks, since the heat that comes to an enclosing structure surface is more easily deviated into heavier building materials forming the room in

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14

Almalaq, Abdulaziz, Tawfik Guesmi, and Saleh Albadran. "A Hybrid Chaotic-Based Multiobjective Differential Evolution Technique for Economic Emission Dispatch Problem." Energies 16, no. 12 (2023): 4554. http://dx.doi.org/10.3390/en16124554.

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The economic emission dispatch problem (EEDP) is a nonconvex and nonsmooth multiobjective optimization problem in the power system field. Generally, fuel cost and total emissions of harmful gases are the problem objective functions. The EEDP decision variables are output powers of thermal generating units (TGUs). To make the EEDP problem more practical, valve point loading effects (VPLEs), prohibited operation zones (POZs), and power balance constraints should be included in the problem constraints. In order to solve this complex and constrained EEDP, a new multiobjective optimization techniqu

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Das, Apangshu, and Sambhu Nath Pradhan. "Shared Reed-Muller Decision Diagram Based Thermal-Aware AND-XOR Decomposition of Logic Circuits." VLSI Design 2016 (April 27, 2016): 1–14. http://dx.doi.org/10.1155/2016/3191286.

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The increased number of complex functional units exerts high power-density within a very-large-scale integration (VLSI) chip which results in overheating. Power-densities directly converge into temperature which reduces the yield of the circuit. An adverse effect of power-density reduction is the increase in area. So, there is a trade-off between area and power-density. In this paper, we introduce a Shared Reed-Muller Decision Diagram (SRMDD) based on fixed polarity AND-XOR decomposition to represent multioutput Boolean functions. By recursively applying transformations and reductions, we obta

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Khouchaf, Lahcen, and Abdelhamid Oufakir. "Relationship Between Elastic, Chemical, and Thermal Properties of SiO2 Flint Aggregate." Molecules 29, no. 24 (2024): 5898. https://doi.org/10.3390/molecules29245898.

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Understanding the relationship between elastic, chemical, and thermal properties is essential for the prevention of the behavior of SiO2 flint aggregates during their application. In fact, the elastic properties of silica depend on chemical and heat treatment. In order to identify the crystallite sizes for natural SiO2 before and after chemical treatment samples, Williamson–Hall plots and Scherer’s formulas are used. The silica nanofibers obtained and their microstructure changes under thermal and chemical treatment are characterized using different techniques (XRD, VP-SEM, TEM, FTIR, TDA, and

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17

Zhou, Quan, Zhengqiang Peng, Mingze Yang, Hao Hu, Ning Song, and Lizhong Ni. "A linear polycarbosilane containing m-carborane units: Synthesis and characterization as precursor for SiC/B4C ceramics." High Performance Polymers 30, no. 10 (2017): 1267–75. http://dx.doi.org/10.1177/0954008317746730.

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The precursor of poly(carborane)(silicon-acetylene) (PCBS) for silicon carbide (SiC)/B4C composite ceramics was synthesized by a salt metathesis reaction. The molecular weight of PCBS was measured by gel permeation chromatography and the corresponding structures were identified by Fourier transform infrared (FTIR) spectroscopy and nuclear magnetic resonance (NMR). After thermal curing, the PCBS was converted to a dark red brittle nonporous monolith and the thermal stability was significantly improved, especially in an air atmosphere. Thermogravimetric analysis indicated that the 5% weight loss

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Šimkovic, Ivan, Pavel Dlapa, and Zuzana Feketeová. "Application of Infrared Spectroscopy and Thermal Analysis in Explaining the Variability of Soil Water Repellency." Applied Sciences 13, no. 1 (2022): 216. http://dx.doi.org/10.3390/app13010216.

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Forests play important role in hydrological processes such as evapotranspiration, infiltration, surface runoff, and distribution of precipitation waters. This study evaluates soil water repellency (SWR) in a mountain forest area of Slovakia (Central Europe). Findings of previous studies suggest that the variability of SWR is associated mainly with differences in soil moisture. On the other hand, the role of soil organic matter (SOM) quality in spatial and/or temporal WR changes is less clear, particularly at the plot scale. To measure SOM quality, we used Fourier-transform infrared (FTIR) spec

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Chiang, Chia-Husan, Mohamed Gamal Mohamed, Wei-Cheng Chen, Manivannan Madhu, Wei-Lung Tseng, and Shiao-Wei Kuo. "Construction of Fluorescent Conjugated Polytriazole Containing Double-Decker Silsesquioxane: Click Polymerization and Thermal Stability." Polymers 15, no. 2 (2023): 331. http://dx.doi.org/10.3390/polym15020331.

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This study synthesized two azide-functionalized monomers through p-dichloro xylene and double-decker silsesquioxane (DDSQ) units with NaN3 to form DB-N3 and DDSQ-N3 monomers, respectively. In addition, five different propargyl-functionalized monomers were also prepared from hydroquinone, bisphenol A, bis(4-hydroxyphenyl)methanone, 2,4-dihydroxybenzaldehyde (then reacted with hydrazine hydrate solution) and 1,2-bis(4-hydroxyphenyl)-1,2-diphenylethene with propargyl bromide to form P-B, P-BPA, P-CO, P-NP, and P-TPE monomers, respectively. As a result, various DDSQ-based main chain copolymers cou

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Hordieiev, Yu S., and A. V. Zaichuk. "Impact of aluminum fluoride addition on crystallization, structure and thermal properties of lead borate glasses." Chalcogenide Letters 21, no. 3 (2024): 243–53. http://dx.doi.org/10.15251/cl.2024.213.243.

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The glass composition (70-x)PbO–(30-y)B2O3–(x+y)AlF3, where x and y ranges from 0 to 20 mol%, were prepared using the conventional melt-quenching-annealing technique. The structural and thermal properties of the glasses were comprehensively analyzed using techniques like Differential Thermal Analysis (DTA), Dilatometry, Fourier-Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). XRD confirmed the amorphous, non-crystalline structure of the glasses. The glass network was found to be composed of structural units such as PbO4, BO4, BO3 and AlO6

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Yang, Jing, Pengrui Cao, Ketian Gao, et al. "Thermal Tunable Tribological Behavior of Shape Memory Biphenyl Epoxy Resin." Coatings 13, no. 1 (2023): 166. http://dx.doi.org/10.3390/coatings13010166.

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Although polymer-based self-lubricating materials have rapidly developed recently, intelligent lubricating materials with self-adaptable lubrication with external conditions changing are highly demanded, especially for harsh conditions. Herein, a shape memory epoxy resin based on the biphenyl units (BPEP) with tunable tribological behavior was systematically studied. X-ray diffraction (XRD), field emission scanning electron microscope (SEM), laser confocal three-dimensional profiler, and optical microscope were applied to analyze the friction and wear mechanism. Due to the presence of the spec

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Homocianu, Mihaela, Diana Serbezeanu, Gabriela Lisa, Mihai Brebu, and Tăchiță Vlad-Bubulac. "Optical and Flame-Retardant Properties of a Series of Polyimides Containing Side Chained Bulky Phosphaphenanthrene Units." International Journal of Molecular Sciences 23, no. 21 (2022): 13174. http://dx.doi.org/10.3390/ijms232113174.

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Among the multitude of polymers with carbon-based macromolecular architectures that easily ignite in certain applications where short circuits may occur, polyimide has evolved as a class of polymers with high thermal stability while exhibiting intrinsic flame retardancy at elevated temperatures via a char-forming mechanism. However, high amounts of aromatic rings in the macromolecular backbone are required for these results, which may affect other properties such as film-forming capacity or mechanical properties; thus, much work has been done to structurally derivatize or make hybrid polyimide

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Stepanova, Elena L., and Pavel V. Zharkov. "Development of a mathematical model of the heating nuclear power unit for optimization studies of autonomous electric power systems." E3S Web of Conferences 470 (2023): 01006. http://dx.doi.org/10.1051/e3sconf/202347001006.

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A two-stage method for creating mathematical models of thermal power nuclear power units for studying autonomous electric power systems is presented in the article. A detailed model of a nuclear power unit is being developed as the first stage. The model has sufficient accuracy of description of technological processes. Optimization calculations are carried out for a large number of operating modes. Аt the second stage, based on the results of optimization calculations of the first stage, energy characteristics and dependencies are constructed to determine the boundaries of the region of feasi

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Allam, E. A., R. M. El-Sharkawy, Kh S. Shaaban, A. El-Taher, M. E. Mahmoud, and Y. El Sayed. "Structural and thermal properties of nickel oxide nanoparticles doped cadmium zinc borate glasses: preparation and characterization." Digest Journal of Nanomaterials and Biostructures 17, no. 1 (2022): 161–70. http://dx.doi.org/10.15251/djnb.2022.171.161.

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Nickel-doped cadmium zinc borate glass of various nickel oxide content was prepared as xNiO–20ZnO–60B2 O3 –(20-x) CdO (0≤x≤5 mol %), by the melt quenching method based on nano metal oxides. Both the zinc oxide nanoparticles (ZnO NPs) and cadmium oxide nanoparticles (CdO NPs) were prepared via the solution–combustion technique. Nickel oxide nanoparticles (NiO NPs) was synthesized by the combustion of Ni(OH)2 and boron oxide nanoparticles (B2 O3 NPs)was synthesized by the solid-state reaction method. The amorphous nature of these types of glass was confirmed using X-ray diffraction analysis (XRD

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Speece, Marvin A., Timothy D. Bowen, James L. Folcik, and Henry N. Pollack. "Analysis of temperatures in sedimentary basins: the Michigan Basin." GEOPHYSICS 50, no. 8 (1985): 1318–34. http://dx.doi.org/10.1190/1.1442003.

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We develop an analytical and numerical methodology for the analysis of large bottom‐hole temperature (BHT) data sets from sedimentary basins, and test the methodology using temperature, stratigraphic, and lithologic data from 411 boreholes in the Michigan Basin. Least‐squares estimates of temperature gradients in the formations and lithologies present are calculated as solutions to a large system of linear equations. At each borehole the temperature difference between the bottom and top of the hole is represented as a sum of temperature increments through the various formations or lithologies

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Huang, Kaifeng, Ruihong Zhou, Yan Li, Litong Dou, Xing Zhang, and Juqiang Feng. "Coal Mine Personnel Safety Monitoring Technology Based on Uncooled Infrared Focal Plane Technology." Processes 10, no. 6 (2022): 1142. http://dx.doi.org/10.3390/pr10061142.

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In an effort to overcome the difficulty of real-time early warning via traditional infrared imaging technology caused by the complex working environment in coal mines, this paper proposes a mine early warning method based on uncooled infrared focal plane technology. The infrared thermal spectrogram of the detected object was visually displayed in a pseudo-color image with high resolution and high sensitivity, which can realize the real-time detection and early warning of personnel safety in modern mines. The multipoint compression correction algorithm based on human visual characteristics divi

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Beiranvand Pour, A., M. Hashim, and M. Pournamdari. "CHROMITITE PROSPECTING USING LANDSAT TM AND ASTER REMOTE SENSING DATA." ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences II-2/W2 (October 19, 2015): 99–103. http://dx.doi.org/10.5194/isprsannals-ii-2-w2-99-2015.

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Studying the ophiolite complexes using multispectral remote sensing satellite data are interesting because of high diversity of minerals and the source of podiform chromitites. This research developed an approach to discriminate lithological units and detecting host rock of chromitite bodies within ophiolitic complexes using the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Landsat Thematic Mapper (TM) satellite data. Three main ophiolite complexes located in south of Iran have been selected for the study. Spectral transform techniques, including minimum noise frac

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Song, Ping, Mingjun Li, Haonan Wang, Yi Cheng, and Zhiyong Wei. "Partially Bio-Based and Biodegradable Poly(Propylene Terephthalate-Co-Adipate) Copolymers: Synthesis, Thermal Properties, and Enzymatic Degradation Behavior." Polymers 16, no. 18 (2024): 2588. http://dx.doi.org/10.3390/polym16182588.

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A series of partially bio-based and biodegradable poly(propylene terephthalate-co-adipate) (PPTA) random copolymers with different components were prepared by the melt polycondensation of petro-based adipic acid and terephthalic acid with bio-based 1,3-propanediol. The microstructure, crystallization behavior, thermal properties, and enzymatic degradation properties were further investigated. The thermal decomposition kinetics was deeply analyzed using Friedman’s method, with the thermal degradation activation energy ranging from 297.8 to 302.1 kJ/mol. The crystallinity and wettability of the

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Huang, Zhi Yi, Shao Rong Lu, Zhi You Yang, Chun He Yu, and Dong Guo. "Studies on the Properties of Epoxy Resins Modified with Novel Liquid Crystalline Polyurethane." Advanced Materials Research 150-151 (October 2010): 727–31. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.727.

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Liquid crystal polyurethane (LCPBI) containing biphenylnate and imide units was synthesized and characterized and used to modify the conventional epoxy resin (E-51). Experimental results revealed that the impact strength of the epoxy resin modified with LCPBI was 2.5 times higher than that of unmodified epoxy resin, and the tensile strength as well as the bending strength was also improved. The thermal decomposition temperature of modified systems was also 15-20oC higher than that of the unmodified system, and the fracture structures of the blends was investigated by SEM.

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Kiseleva, Nadezda. "Principles and methods of developing a map “Geographical patterns of natural regeneration and forest stand productivity”." InterCarto. InterGIS 26, no. 4 (2020): 73–89. http://dx.doi.org/10.35595/2414-9179-2020-4-26-73-89.

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A special series of small-scale maps (approximate scale 1 : 7 500 000–1 : 8 000 000) is necessary for more effective forestry management in Russia and ensuring the stable functioning of this sector of the economy to create. These maps should give a holistic spatial representation of the object of forestry activity, they will allow to give a realistic assessment of the forest resource potential of the country. One of the maps in the series is “Geographical patterns of natural regeneration and forest stand productivity”. The basic principles of the map constructing are: general geographical patt

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Libeesh, Nharakkat Kalarikkal, and Sundaram Arivazhagan. "Satellite data based abundance mapping of mafic and ultramafic rocks in Mettupalayam, Tamil Nadu, India." Geology, Geophysics and Environment 47, no. 3 (2021): 131–42. http://dx.doi.org/10.7494/geol.2021.47.3.131.

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The mafic and ultramafic rocks of Mettupalayam belong to the southern granulite terrain of India, which is concomitant with vital economic resources. The advantage of Advanced Spaceborne Thermal Emission and Reflectance Radiometer (ASTER) data for mapping the litho units are exploited well here for differentiating the rock units with the aid of band combination (1, 3, 6), principal component analysis (5, 1, 6) and band ratioed band combination (2/3, 3/2, 1/5 and (9–8)/1, (8–6)/2, and (9–6)/3). As part of the field study, the collection of samples and ground control points were carried out and

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Qi, Liyan, Qianjin Zhu, Dan Cao, et al. "Preparation and Properties of Stereocomplex of Poly(lactic acid) and Its Amphiphilic Copolymers Containing Glucose Groups." Polymers 12, no. 4 (2020): 760. http://dx.doi.org/10.3390/polym12040760.

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The stereocomplex of poly(lactic acid) containing glucose groups (sc-PLAG) was prepared by solution blending from equal amounts of poly(l-lactic acid) (PLLA) and poly(d-lactic acid-co-glucose) (PDLAG), which were synthesized from l- and d-lactic acid and glucose by melt polycondensation. The methods, including 1H nuclear magnetic resonance spectroscopy (1H NMR), gel permeation chromatography (GPC), differential scanning calorimetry (DSC), X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), polarizing microscope (POM), scanning electron mi

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Hordieiev, Yu S., and A. V. Zaichuk. "Effects of composition on the structure, thermal and some physical characteristics of Bi2O3-B2O3-ZnO-SiO2 glasse." Journal of Ovonic Research 20, no. 3 (2024): 273–83. http://dx.doi.org/10.15251/jor.2024.203.273.

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The influence of composition on the structure, thermal, and some physical characteristics of bismuth borate glasses, formulated as 55Bi2O3–(35-x-y)B2O3–(5+x)ZnO–(5+y)SiO2 (where 0 ≤ x, y ≤ 15 mol%), was investigated. Comprehensive analyses were conducted using techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), Differential Thermal Analysis (DTA), and Dilatometry. XRD confirmed the amorphous nature of the glass samples, while FTIR spectroscopy revealed that the glasses are primarily composed of BO4, BO3, BiO6, BiO3, Zn

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Alotaibi, Abdullah A., Chaima Ayari, Elham Bajuavfir, et al. "Stabilization of Tetrachloride with Mn (II) and Co (II)Complexes and 4-Tert-Butylpyridinium Organic Cation: Elaboration of the Structure and Hirshfeld Surface, Optical, Spectroscopic and Thermal Analyses." Crystals 12, no. 2 (2022): 140. http://dx.doi.org/10.3390/cryst12020140.

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[C9H14N]2[MnCl4] (I) and [C9H14N]2[CoCl4] (II) are isostructural compounds produced via gradual evaporation at room temperature. Both compounds consolidate in the tetragonal space group I4¯2d (No. 122), as shown by single-crystal X-ray diffraction observations. A slightly deformed tetrahedral geometry is formed by four chloride atoms around each cation MII (M = Mn or Co). The [C9H14N]+ groups and the isolated [MCl4]2− units are connected via C–H…Cl and N–H…Cl H-bonds to form sheets parallel to the (101¯), (011), (01¯1) and (101) planes. The morphology and the chemical composition of compounds

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Kostov, Konstantin, Ivan Ivanov, Koycho Atanasov, Chavdar Nikolov, and Stefan Kalchev. "Experimental determination of the heat exchange coefficient of industrial steam pipelines." EUREKA: Physics and Engineering, no. 5 (September 30, 2022): 55–66. https://doi.org/10.21303/2461-4262.2022.002473.

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The article discusses and analyses the factors related to the use of a thermal imaging camera to determine heat loss in industrial steam pipelines at factories from chemical and metallurgical industry, by measuring their surface temperature. The generally accepted enthalpy method for determination of the loss has serious drawback it gives accurate results, but in averaged units in which it is impossible to take account of the contribution of the different parts and components of the pipeline in the total heat loss. The unavailability of information on where, how and in what way along the route

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Tu, Thach N., and Nhung Thi Tran. "A New V-Based Metal–Organic Framework Synthesized from Pyrene-Based Linker." Journal of Technical Education Science, no. 68 (February 28, 2022): 11–17. http://dx.doi.org/10.54644/jte.68.2022.1081.

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A new vanadium based metal–organic framework (MOF), termed V-TBAPy, V2O2(C44H22O8)·9.5H2O, was designed and solvothermal synthesized. Crystal structure analysis showed that V-TBAPy is constructed from VO(CO2)2 rod-shaped SBUs (SBUs = secondary building units) and 1,3,6,8-tetrakis(p-benzoate)pyrene (TBAPy4–) linker to adopt the frz architecture highlighted by 1D channel of 9.3 Å and 4.0 × 9.4 Å2 in the structure. V-TBAPy was characterized by powder x-ray diffraction analysis (PXRD), thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR), elemental analysis (EA) and N2 adsorption

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Sivaramakrishnan, T., and G. Elango. "Synthesis, Characterization and in vitro Antimicrobial, Anticancer Activity of Random Copolyester using Orcinol." Asian Journal of Chemistry 33, no. 9 (2021): 2119–26. http://dx.doi.org/10.14233/ajchem.2021.23302.

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In present study, a novel random copolyester i.e. poly(3-oxy-5-methylphenyl-4-oxynaphthal-1- yl)isophthalate (PONI) was synthesized through solution polycondensation methodology involving orcinol, 1,4-naphthalene diol and isophthaloyl chloride and its solubility in common solvents along with viscosity measurements were performed. The structure of the repeat units in the polyester chain were ascertained based on the spectral characterization of UV-visible, FTIR, 1H & 13C NMR techniques. Thermal analysis of the copolyester were performed by TGA and DSC studies. The activation energy for ther

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Raźny, Natalia, Anna Dmitruk, and Krzysztof Naplocha. "Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage." Surface Engineering 39, no. 6 (2023): 641–52. https://doi.org/10.1080/02670844.2023.2236363.

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The research aims to determine whether a protective oxide coating obtained by plasma electrolytic oxidation (PEO) will prevent unfavourable changes occurring on the surface of aluminium heat enhancers for thermal energy storage (TES) based on phase change materials (PCMs). For domestic purposes (short-term, solar energy), salt hydrates are widely utilised as PCMs. Their low thermal conductivity makes the application of metal enhancers necessary to improve heat transfer in the unit. Due to the chemically aggressive nature of MgCl<sub>2</sub>·H<sub>2</sub>O, aluminium enhancers can be neg

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Subashini, C., R. Ezhil Pavai, and L. Balu. "Effect of Pb2+ Ions on the Mechanical, Structural and Thermal Behaviour of B2O3-CaO Glasses." Asian Journal of Chemistry 32, no. 1 (2019): 101–5. http://dx.doi.org/10.14233/ajchem.2020.22337.

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B2O3-CaO-PbO glasses with different concentrations of PbO (5-20 mol % in four steps) were prepared by melt quench technique. The amorphous nature and homogeneities of the prepared glasses were confirmed by XRD and SEM analyses. Ultrasonic velocities and density were measured at 303 K using pulse-echo technique and Archimedes’ principle respectively. Various parameters, viz., molar volume, longitudinal modulus, shear modulus, bulk modulus, Young’s modulus, Poisson’s ratio, micro-hardness and Debye temperature have been evaluated from the measured data. The results of ultrasonic properties indic

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Pergal, Marija, Vesna Antic, Sanja Ostojic, Milena Marinovic-Cincovic та Jasna Djonlagic. "Influence of the content of hard segments on the properties of novel urethane-siloxane copolymers based on a poly(ε-caprolactone)-b-poly(dimethylsiloxane)-b-poly(ε- caprolactone) triblock copolymer". Journal of the Serbian Chemical Society 76, № 12 (2011): 1703–23. http://dx.doi.org/10.2298/jsc110307146p.

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A series of novel thermoplastic urethane-siloxane copolymers (TPUSs) based on a ?,?-dihydroxy-[poly(?-caprolactone)-bpoly( dimethylsiloxane)-b-poly(?-caprolactone)] (?,?-dihydroxy-PCLPDMS- PCL) triblock copolymer, 4,4?-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol (BD) was synthesized. The effects of the content (9-63 wt. %) of hard urethane segments and their degree of polymerization on the properties of the segmented TPUSs were investigated. The structure, composition and hard segment degree of polymerization of the hard segments were examined using 1H- and quantitative 13C-NMR spe

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Safaei, Mohsen, Mojtaba Taran, Mohammad Moslem Imani, et al. "Application of Taguchi method in the optimization of synthesis of cellulose-MgO bionanocomposite as antibacterial agent." Polish Journal of Chemical Technology 21, no. 4 (2019): 116–22. http://dx.doi.org/10.2478/pjct-2019-0047.

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Abstract In this study, optimal conditions to form cellulose-MgO nanocomposite with antibacterial properties were evaluated. Applying the Taguchi method, 9 experiments were designed and the effects of different concentrations of biopolymers cellulose (0.5, 1 and 2 mg/ml), MgO nanoparticles (2, 4 and 8 mg/ml) and stirring times (30, 60 and 90 min) on antibacterial activity of synthesized nanocomposites were assessed. The characterizations of products were investigated by dynamic light scattering (DLS), raman spectroscopy, scanning electron microscope (SEM), thermogravimetric analysis (TGA) and

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Liang, Jiahao, Ziyang Hu, Dantong Cao, et al. "Establishment of Narrow Root Fracture Models Using Modified Temperature Cycling Method and Diagnosis Using Different Cone-Beam CT Units." Scanning 2022 (July 14, 2022): 1–7. http://dx.doi.org/10.1155/2022/3636795.

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Aim. Using a modified thermal cycling method to establish narrow root fracture models and evaluate the diagnosis efficiency of them using four different cone-beam CT (CBCT) units. Methodology. Fifty-six intact teeth were selected, and the crowns of the teeth were embedded using general purpose acrylic resin. 50 root fracture models were established by soaking these teeth in liquid nitrogen and hot water cyclically; 6 teeth were used as the negative control. All the 56 teeth were scanned with the smallest voxel size of four different CBCT units (NewTom VGi, Planmeca Promax 3D Max, Kavo 3D eXam,

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Doubenskaia, Maria, Sergey Grigoriev, Ivan Zhirnov, and Igor Smurov. "Parametric analysis of SLM using comprehensive optical monitoring." Rapid Prototyping Journal 22, no. 1 (2016): 40–50. http://dx.doi.org/10.1108/rpj-04-2014-0046.

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Purpose – This paper aims to propose methods for on-line monitoring and process quality assurance of Selective Laser Melting (SLM) technology as a competitive advantage to enhance its implementation into modern manufacturing industry. Design/methodology/approach – Monitoring of thermal emission from the laser impact zone was carried out by an originally developed pyrometer and a charge-coupled device (CCD) camera which were integrated with the optical system of the PHENIX PM-100 machine. Experiments are performed with variation of the basic process parameters such as powder layer thickness (0-

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Hamciuc, Corneliu, Tăchiță Vlad-Bubulac, Diana Serbezeanu, et al. "Thermal Properties and Flammability Characteristics of a Series of DGEBA-Based Thermosets Loaded with a Novel Bisphenol Containing DOPO and Phenylphosphonate Units." Materials 15, no. 21 (2022): 7829. http://dx.doi.org/10.3390/ma15217829.

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Despite a recent sustained preoccupation for developing biobased epoxies with enhanced applicability, such products have not been widely accepted for industry because of their inferior characteristics compared to classic petroleum-based epoxy thermosets. Therefore, significant effort is being made to improve the flame retardance of the most commonly used epoxies, such as diglycidyl ether-based bisphenol A (DGEBA), bisphenol F (DGEBF), novalac epoxy, and others, while continuously avoiding the use of hazardous halogen-containing flame retardants. Herein, a phosphorus-containing bisphenol, bis(4

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Chang, Jiajia, Xiaoqing Wang, Jian Shao, Xiaomeng Li, Wei Xin, and Yunjun Luo. "Synthesis and Characterization of Environmentally-Friendly Self-Matting Waterborne Polyurethane Coatings." Coatings 10, no. 5 (2020): 494. http://dx.doi.org/10.3390/coatings10050494.

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A series of self-matting waterborne polyurethanes (WPUs) were successfully prepared by introducing hydrophilic units into both soft and hard segments. By employing a polycaprolactone polyol containing carboxylate groups within the polymer chains to provide hydrophilicity directly, the matting performance of WPU films was greatly improved. The chemical structures of the WPU resins were confirmed by FTIR spectroscopy, and the morphology of WPU films was observed by SEM. The parameters of WPU preparation were investigated in detail. It was found that the surface gloss of WPU films as well as the

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Li, Baiyi, and Guangdong Zhou. "Preparation of Phosphate Glass by the Conventional and Microwave Melt-Quenching Methods and Research on Its Performance." Materials 18, no. 5 (2025): 1079. https://doi.org/10.3390/ma18051079.

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In this study, various phosphate glasses (PGs) within the CaO-Na2O-P2O5 and SiO2-CaO-Na2O-P2O5 systems were synthesized using both conventional and microwave melt-quenching techniques. The physical, thermal, and structural properties of these phosphate glasses, as well as their dissolution behaviors under varying temperatures and solvent conditions, were thoroughly examined. Additionally, the influence of scale inhibitor dosage, temperature, and pH on the rate of scale inhibition was assessed using a static scale inhibition test. The morphology and crystal types of the precipitates were charac

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Giannakoudakis, Dimitrios A., and Teresa J. Bandosz. "Building MOF Nanocomposites with Oxidized Graphitic Carbon Nitride Nanospheres: The Effect of Framework Geometry on the Structural Heterogeneity." Molecules 24, no. 24 (2019): 4529. http://dx.doi.org/10.3390/molecules24244529.

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Composite of two MOFs, copper-based Cu-BTC (HKUST-1) and zirconium-based Zr-BDC (UiO-66), with oxidized graphitic carbon nitride nanospheres were synthesized. For comparison, pure MOFs were also obtained. The surface features were analyzed using x-ray diffraction (XRD), sorption of nitrogen, thermal analysis, and scanning electron microscopy (SEM). The incorporation of oxidized g-C3N4 to the Cu-BTC framework caused the formation of a heterogeneous material of a hierarchical pores structure, but a decreased surface area when compared to that of the parent MOF. In the case of UiO-66, functionali

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Lima, Poliana S., Rossanna Trocolli, Renate M. R. Wellen, et al. "HDPE/Chitosan Composites Modified with PE-g-MA. Thermal, Morphological and Antibacterial Analysis." Polymers 11, no. 10 (2019): 1559. http://dx.doi.org/10.3390/polym11101559.

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In this work, composites of high density polyethylene (HDPE) with chitosan were prepared by melt compounding in a laboratory internal mixer. Maleic anhydride grafted HDPE (PE-g-MA) in a concentration up to 25 phr was used as a compatibilizer to enhance the dispersing effect of chitosan in the HDPE matrix. The degree of crystallinity was investigated by X-ray diffraction (XRD) and the thermal properties were analyzed by differential scanning calorimetry (DSC) and thermogravimetry (TG). The morphology was investigated by optical microscopy (OM) and scanning electron microscopy (SEM). The integri

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Bajorek, A., C. Berger, M. Dulski, et al. "Tuning Physical Properties of NiFe2O4 and NiFe2O4@SiO2 Nanoferrites by Thermal Treatment." Metallurgical and Materials Transactions A 53, no. 4 (2022): 1208–30. http://dx.doi.org/10.1007/s11661-021-06567-0.

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AbstractThe comparison between NiFe2O4 (co-precipitation) and NiFe2O4@SiO2 (co-precipitation and microemulsion) ferrite nanoparticles in their as-received and annealed form is presented. The structural characterization revealed the gradual crystallization of as-received samples induced by thermal treatment. The existence of cubic inverse spinel ferrite structure with tetrahedral and octahedral iron occupancy is confirmed in all samples by the comprehensive study. The Fourier-transform infrared (FTIR) spectroscopy confirmed the typical spinel structure and other Fe-based states, whereas the pre

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Tatar, Demet, M. Lutfi Öveçoğlu, Gonul Özen, and Scott A. Speakman. "Microstructural characterization and crystallization kinetics of (1-x)TeO2-0.10CdF2-xPbF2 (x = 0.05, 0.10, and 0.15 mol) glasses." Journal of Materials Research 24, no. 10 (2009): 3087–94. http://dx.doi.org/10.1557/jmr.2009.0380.

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Microstructural characterization and crystallization kinetics of (1-x)TeO2-0.10CdF2-xPbF2 (x = 0.05, 0.10, and 0.15 in molar ratio) glasses were investigated using differential thermal analysis (DTA), x-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy/energy dispersive spectrometer (SEM/EDS), and absorbance spectroscopy techniques. For all of the glass compositions only one exothermic peak was observed on the DTA plots, and on the basis of the XRD and Raman spectrophotometry investigations it was understood that they refer to the formation of the α-TeO2 phase. SEM/EDS in

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