Relevant bibliographies by topics / Specific heat capacities

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Specific heat capacities'

Author: Grafiati
Published: 4 June 2025
Last updated: 23 June 2025

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Journal articles on the topic "Specific heat capacities"

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Onderka, B., A. Sypien, A. Wierzbicka-Miernik, T. Czeppe, and L. A. Zabdyr. "Specific Heat Capacities of Some Ternary Aluminides." Journal of Phase Equilibria and Diffusion 32, no. 1 (2010): 39–41. http://dx.doi.org/10.1007/s11669-010-9822-5.

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SHI, X. H., G. L. MA, Y. G. MA, X. Z. CAI та J. H. CHEN. "“TEMPERATURE” FLUCTUATION AND HEAT CAPACITIES OF QUARKS AND π MESON". International Journal of Modern Physics E 16, № 07n08 (2007): 1912–16. http://dx.doi.org/10.1142/s0218301307007222.

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Specific heat capacities of π meson and different quarks after parton cascade AMPT model in Au + Au collisions at [Formula: see text] have been tentatively extracted from the event-by-event temperature fluctuations in the region of low transverse mass. The specific heat capacity of π meson shows a slight dropping trend with increasing impact parameter. The specific heat capacities of different quarks increase with the mass of quark, and the sum of up and down quark's specific heat capacities was found to be approximately equal to that of π meson.
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Morad, N. A., M. Idrees, and A. A. Hasan. "Specific heat capacities of pure triglycerides by heat-flux differential scanning calorimetry." Journal of Thermal Analysis 45, no. 6 (1995): 1449–61. http://dx.doi.org/10.1007/bf02547438.

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Uddin, Kutub, Md Amirul Islam, Sourav Mitra, et al. "Specific heat capacities of carbon-based adsorbents for adsorption heat pump application." Applied Thermal Engineering 129 (January 2018): 117–26. http://dx.doi.org/10.1016/j.applthermaleng.2017.09.057.

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Bobzin, K., C. Kalscheuer, M. Carlet, and J. Janowitz. "Specific heat capacity of chromium aluminum based nitride and oxynitride hard coatings." Materialwissenschaft und Werkstofftechnik 55, no. 2 (2024): 240–46. http://dx.doi.org/10.1002/mawe.202300147.

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AbstractIn simulation for machining processes, temperature dependent properties and their exact specification are important for application oriented results. For calculation of coated tools and components, interest in thermophysical properties of hard coatings is increasing. A methodical approach is used to measure the specific heat capacity of nitride and oxynitride hard coatings deposited by physical vapor deposition. The coating is converted into powdery state and measured by differential scanning calorimetry. Heat capacities for Cr44Al5N51 and two oxynitride Cr40Al5O18N37 and Cr44Al8O28N21 coatings were measured from T=200 °C to T=900 °C, technically relevant in tribological applications and manufacturing technology. The measured heat capacities showed reproducible results between cp ≈0.38 J/gK and cp ≈0.78 J/gK and dependency on the chemical composition of the coatings. The coating with highest non‐metal to metal ratio exhibited the highest heat capacity. The coating with highest oxygen content and lowest non‐metal to metal ratio showed the lowest heat capacity. Hard coatings and their thermophysical properties can affect heat transfer in industrial processes. Knowledge of these properties is necessary for process control by temperature sensor coatings or temperature dependent simulations. With measured values of heat capacities of physically vapor deposited hard coatings separated from the substrate, coatings can be adapted for use in application.
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Chen, Chen Tung A. "High-pressure specific heat capacities of pure water and seawater." Journal of Chemical & Engineering Data 32, no. 4 (1987): 469–72. http://dx.doi.org/10.1021/je00050a026.

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Wang, S., X. M. Jiang, Q. Wang, et al. "Research of specific heat capacities of three large seaweed biomass." Journal of Thermal Analysis and Calorimetry 115, no. 3 (2013): 2071–77. http://dx.doi.org/10.1007/s10973-013-3141-0.

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Sway, K., Jamey K. Hovey, and Peter R. Tremaine. "Apparent molar heat capacities and volumes of alkylbenzenesulfonate salts in water: substituent group additivity." Canadian Journal of Chemistry 64, no. 2 (1986): 394–98. http://dx.doi.org/10.1139/v86-063.

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Densities and specific heats were measured for the aqueous sodium salts of benzenesulfonate, p-toluenesulfonate, 2,4- and 2,5-dimethylbenzenesulfonate, mesitylenesulfonate, and p-ethylbenzenesulfonate. The limiting partial molar volumes, [Formula: see text] and heat capacities, [Formula: see text], lead to revised values in the group contributions for aromatic —CH2— and —CH3 groups in the additivity scheme proposed by Perron and Desnoyers. The heat capacities of substituted alkylbenzenes can deviate from group additivity by as much as 70 and 40 J K−1 mol,−1, respectively, when polar groups are located on the α and β positions of the alkyl chain.
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Günther, D., and F. Steimle. "Mixing rules for the specific heat capacities of several HFC-mixtures." International Journal of Refrigeration 20, no. 4 (1997): 235–43. http://dx.doi.org/10.1016/s0140-7007(97)00015-7.

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Joseph Gordian Atat, Joseph Gordian Atat, Emmanuel Bassey Umoren, Sunday Samuel Ekpo, and Unyime Akpan Umoette. "DETERMINATION OF SPECIFIC HEAT CAPACITIES OF LIQUIDS FROM SOME CONSUMABLE ITEMS." Journal of Advanced Research in Medical and Health Science (ISSN 2208-2425) 10, no. 4 (2024): 47–56. http://dx.doi.org/10.61841/e1sv7p88.

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This study was done to obtain the Specific Heat Capacities (SHC) of some liquids from some intake items (they are consumed widely in Niger Delta, Nigeria). These items are vegetables (Afang leaf, Pumpkin leaf, Bitter leaf, Scent leaf, Water leaf), fruits (Orange, Cucumber, Pineapple, Watermelon, Lime) and juice (Ribena, Chivita Exotic, Chivita Happy Hour, Chivita Active and Five Alive). Calorimeter was used and Method of mixtures was adopted for this finding. Measured parameters were obtained in the laboratory. Microsoft Excel was used for other analyses and computation of results.
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Dissertations / Theses on the topic "Specific heat capacities"

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Fominaya, Fernando. "Nanocalorimètre pour l'étude de couches minces et de micro-monocristaux : application à Mn12-acétate." Université Joseph Fourier (Grenoble ; 1971-2015), 1997. http://www.theses.fr/1997GRE10150.

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Nous avons developpe un nanocalorimetre original pour mesurer la chaleur specifique de couches minces, multicouches (epaisseur typique : 1000 a) et de monocristaux (masse de l'ordre du g) dans la gamme de temperature 1. 5 a 20 k. La capacite calorifique du dispositif vide est de 3 nj/k a 4 k (0. 5 nj/k a 1. 5 k), on peut alors acceder des capacites calorifiques de l'ordre du nj/k a 4 k pour les echantillons. Les differences de capacite calorifique en fonction de la temperature ou d'un champ magnetique applique ont ete determine avec une resolution de c/c 10#-#4, permettant ainsi de voir des variations de moins d'un pj/k. Nous presentons des mesures faites sur une couche mince de pb supraconductrice, sur des multicouches magnetiques et sur des micro-monocristaux de mn#1#2o#1#2-acetate. Cette derniere mesure a mis en evidence le processus d'inversion d'aimantation par effet tunnel dans des cristaux de masse de 1g et de 20g. Notre etude permet d'examiner a la fois le regime tunnel irreversible au-dessous de la temperature de blocage t#b (typ. 3. 5 k) et le regime tunnel reversible au-dessus de t#b. Pour t < t#b nous trouvons des anomalies de chaleur specifique a des valeurs du champ magnetique correspondantes au croisement des niveaux spin-up et spin-down de differents nombres quantiques magnetiques. Ces anomalies disparaissent par augmentation de la temperature (typ. Au-dela de 6 k). Au-dessous de t#b, des degagements de chaleur sont observes lorsque les niveaux magnetiques se croisent a des champs antiparalleles a l'aimantation initiale. Ces mesures representent une nouvelle approche de l'etude du mn#1#2o#1#2-acetate et montrent l'interet de la nanocalorimetrie pour l'etude des grandes molecules magnetiques.
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Books on the topic "Specific heat capacities"

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Gunn, Robert W., and Betsy Raskin Gullickson. On the High Wire. Praeger, 2005. http://dx.doi.org/10.5040/9798400693137.

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You've just been promoted and find yourself questioning your ability to pull off the new job. Now what? Virtually every leader recalls that make or break promotion when success depends on accessing inner capacities that lie just beyond prior experience. Taking on new challenges and responsibilities as a manager can be one of the most exhilarating and rewarding transitions in a businessperson's career. It can also be fraught with stress, self-doubt, isolation, and frustration. Bob Gunn and Betsy Gullickson draw on decades of executive coaching and human resource consulting experience to characterize the process of management promotion as walking the high wire-venturing into the unknown without a safety net. In this highly accessible guide, Gunn and Gullickson address the challenges and opportunities head-on and offer specific strategies and tactics for navigating the transition into leadership, delegation, conflict management, motivation, project management, and problem solving. Featuring thought-provoking questions and a listing of helpful resources,On the High Wirewill engage and inspire new managers to become even more creative and effective leaders. At the heart of the book is the notion that productive and fulfilling management is not simply a collection of skills and techniques, but a mindset. Illustrating this theme through many powerful first-hand examples, the authors guide you toward achieving the clarity of vision and purpose that comes from being aware of context, attuned to the feelings that influence behavior, and respectful of multiple points of view. Featuring thought-provoking questions and a listing of helpful resources,On the High Wirewill engage and inspire new managers to become even more creative and effective leaders.
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Tenenbaum, Sergio. Rational Powers in Action. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198851486.001.0001.

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Human actions unfold over time, in pursuit of ends that are not fully specified in advance. Rational Powers in Action locates these features of the human condition at the heart of a new theory of instrumental rationality. Where many theories of rational agency focus on instantaneous choices between sharply defined outcomes, treating the temporally extended and partially open-ended character of action as an afterthought, this book argues that the deep structure of instrumental rationality can only be understood if we see how it governs the pursuit of long-term, indeterminate ends. These are ends that cannot be realized through a single momentary action, and whose content leaves partly open what counts as realizing the end. For example, one cannot simply write a book through an instantaneous choice to do so; over time, one must execute a variety of actions to realize one’s goal of writing a book, where one may do a better or worse job of attaining that goal, and what counts as succeeding at it is not fully determined in advance. Even to explain the rational governance of much less ambitious actions like making dinner, this book argues that we need to focus on temporal duration and the indeterminacy of ends in intentional action. Theories of moment-by-moment preference maximization, or indeed any understanding of instrumental rationality on the basis of momentary mental items, cannot capture the fundamental structure of our instrumentally rational capacities. This book puts forward a theory of instrumental rationality as rationality in action.
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Book chapters on the topic "Specific heat capacities"

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Nekhubvi, Vhutshilo. "The Investigation of Chemical Composition and the Specific Heat Capacity of Cow Dung and Water Mixture." In Anaerobic Digestion - Biotechnology for Reactor Performance and Environmental Sustainability [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.112168.

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Energy is essential for the progress and development of nations. It must be reliable, affordable, and environmentally friendly. Among the most promising renewable energy sources, biogas technology has been developed to secure the existing energy supply. However, there is a need for more scientific research on the optimal use and performance of biogas plants for beneficiaries and installers. This study investigated the chemical composition of cow dung and its specific heat capacity. The results show that elements such as Al2O3, CaO, Fe2O3, K2O, MgO, MnO, Na2O, P2O5, SiO2, and TiO2 have different chemical compositions. Furthermore, the results show that cow dung’s composition and oxide content affect its specific heat capacity. Dzwerani had the highest concentrations of Al2O3, Fe2O3, and SiO2. Since the oxide composition of the dung samples from Tshino, Maila, and Gogogo differed, their specific heat capacities were also different. The results of this study encourage further investigations to determine a more accurate relationship between specific heat capacity and oxide composition.
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Lynch, Michael R. "Enzymes and Metabolic Pathways." In Evolutionary Cell Biology. Oxford University PressOxford, 2024. http://dx.doi.org/10.1093/oso/9780192847287.003.0019.

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Abstract Metabolic reactions are carried out by enzymes capable of enhancing specific reaction rates by many orders of magnitude above spontaneous background levels. Although specialized for particular functions, most enzymes are also highly promiscuous and have catalytic capacities that are commonly far below the biophysical limits, suggesting that the degree of molecular refinement is generally stalled at a drift barrier. Enzyme promiscuity facilitates the emergence of novel enzyme functions by descent with modification, usually via just a few key amino-acid substitutions. Individual enzymes typically carry out just simple chemical modifications, necessitating the use of multi-step metabolic pathways in the transformation of organic material. Despite their conserved functions, many enzymatic steps and their molecular participants have diverged substantially among phylogenetic lineages, with gene duplication and divergence often playing a role in such remodelling. Overall flux rates are generally influenced most by the enzymes furthest upstream in a pathway. Most catabolic pathways are energetically inefficient, with a substantial amount of energy contained within substrate molecules being lost as heat rather than being converted to ATP. Flux-rate theory suggests that such inefficiency is an inevitable outcome of maximizing the net rate of product formation.
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Qu, Laiye, Yannan Wang, Cong Shi, et al. "Vigor and Health of Urban Green Resources under Elevated O3 in Far East Asia." In Environmental Sciences. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.106957.

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Conservation of urban greens is an essential action for city residents, however, declining symptoms and/or traces in the annual ring of trees grown are found in parks and forest stands in a city as well as its suburb with a high level of ozone (O3). Urban greens, including roof-green, provide comfortable conditions for the people and a moderate environment in a city. They are exposed to severe environments; heat, drought, air-pollutions, etc. even with intensive management of the people. How can we proceed with the conservation and wise use of urban greens? We should know the ecophysiological responses of urban trees to such a global environment as well as a local one. Defensive capacities of urban greens should be analyzed in terms of damages caused by biotic and abiotic stresses, and it is important to understand their interactions from the viewpoint of plant-insect/disease. There is a concern that some green areas are suffering from an outbreak of insects and diseases, reducing the vigor and health of urban greens. We discuss these based on specific examples, such as man-made forests, in cities in far east Asia for considering our approach to how to keep urban green resources.
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Kodandapani, Narendran. "Adapting to Climatic Extremes through Climate Resilient Industrial Landscapes: Building Capacities in the Southern Indian States of Telangana and Andhra Pradesh." In Climate Issues in Asia and Africa - Examining Climate, Its Flux, the Consequences, and Society's Responses [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.98732.

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There is now greater confidence and understanding of the consequences of anthropogenic caused climate change. One of the many impacts of climate change, has been the occurrence of extreme climatic events, recent studies indicate that the magnitude, frequency, and intensity of hydro-meteorological events such as heat waves, cyclones, droughts, wildfires, and floods are expected to increase several fold in the coming decades. These climatic extremes are likely to have social, economic, and environmental costs to nations across the globe. There is an urgent need to prepare various stakeholders to these disasters through capacity building and training measures. Here, we present an analysis of the capacity needs assessment of various stakeholders to climate change adaptation in industrial parks in two southern states of India. Adaptation to climate change in industrial areas is an understudied yet highly urgent requirement to build resilience among stakeholders in the Indian subcontinent. The capacity needs assessment was conducted in two stages, participatory rural appraisal (PRA) and focus group discussion (FGD) were conducted among various stakeholders to determine the current capacities for climate change adaptation (CCA) for both, stakeholders and functional groups. Our analysis indicates that in the states of Telangana and Andhra Pradesh, all stakeholder groups require low to high levels of retraining in infrastructure and engineering, planning, and financial aspects related to CCA. Our study broadly supports the need for capacity building and retraining of functionaries at local and state levels in various climate change adaptation measures; likewise industry managers need support to alleviate the impacts of climate change. Specific knowledge, skills, and abilities, with regard to land zoning, storm water management, developing building codes, green financing for CCA, early warning systems for climatic extremes, to name a few are required to enhance and build resilience to climate change in the industrial landscapes of the two states.
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Kaufmann, Florian, Ludwig Irrgang, Christopher Schifflechner, and Hartmut Spliethoff. "DEVELOPMENT OF A GENERALISED LOW-ORDER MODEL FOR TWIN-SCREW COMPRESSORS." In Proceedings of the 7th International Seminar on ORC Power System (ORC 2023), 2024th ed. Editorial Universidad de Sevilla, 2024. http://dx.doi.org/10.12795/9788447227457_69.

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Twin-screw compressors (TSC) are commonly used in heat pump processes due to their robustness and flexibility. They exhibit two core properties, i.e. the swept volume and the built-in volume ratio (BVR), which heavily influence their capacity limits and off-design efficiency. Several models of vastly different computational costs have been proposed in literature to calculate the performance of TSCs. For applications that rely on large amounts of simulation runs, the computational cost of the compressor model becomes an essential factor. This work presents a new low-order model, which can accurately predict a TSC’s behaviour. First, a semi-empirical model from literature is slightly adapted and used to generate performance data for a large operational field. Then a polynomial model with a linearisation for high pressure ratios is fitted to this data. The model uses the external pressure ratio and volumetric compressor inlet flow to calculate isentropic efficiency and compressor speed. Both input parameters are normalised with a reference flowrate (calculated from the swept volume) and the BVR, respectively. This results in a generalised model of low numerical cost, which can be used for explorative studies independent of the specific machine size and BVR. A gain in computational speed by a factor of roughly 375 is achieved compared to a semi-empirical reference model. The model displays good predictive accuracy when used to predict the performance of machines with similar BVRs, but different sizes. When there is a difference in size and BVR, the prediction accuracy is still reasonable but significantly declines for small pressure ratios. Nevertheless, the proposed new approach extends the state-of-the-art by introducing a low-order model, which combines the advantages of low computational cost, good accuracy, physically correct predictions over a wide operational range and scalability to different machine capacities and BVRs.
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Milnor, William R. "Autonomic and Peripheral Control Mechanisms." In Cardiovascular Physiology. Oxford University PressNew York, NY, 1990. http://dx.doi.org/10.1093/oso/9780195058840.003.0008.

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Abstract The role of the central nervous system in regulating the heart and circulation was described in Chapter 7, along with an account of the peripheral sensors that provide the brain with relevant information. Here we move on to the neural and other mechanisms that send controlling signals to the cardiovascular tis sues. These commands reach the cells of the heart and blood vessels in the form of specific substances, which may be delivered as neurotransmitters, hormones, or paracrine agents. In recent years, it has become apparent that some substances serve in all three capacities.
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Maurseth, Julianne E. "Embodied Ethics for Our Interdependent World." In Ethical Models and Applications of Globalization. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-61350-332-4.ch002.

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This chapter poses timely questions for us as global citizens regarding our capacities for ethical choice in a complex, interdependent world, and offers the multi-discipline perspective of “embodied ethics” for expanding our conscious capacities. Today more than ever – in business, in government, in education, in our daily lives - we need to recognize how our micro-level choices lead to macro-level impacts. Research across neurology, biology, quantum physics, and other fields indicates we human beings are multi-dimensional: physical, emotional, mental, and spiritual – simultaneously – and therefore have greater capacities than we consciously use. “Embodied ethics” is a synthesis which explains why and how we physically experience our interconnectivity as human beings, from which ethical choices arise, and why we may listen to our own body, or “emotional intelligence” and heart - or not - in the midst of an ethical decision process. Six stories are offered which illustrate these dynamics: three stories reveal the ways individuals felt their own interconnectivity with others, giving rise to ethical choices with positive global impacts, and three stories reveal the ways individuals denied their own interconnectivity with others, giving rise to unethical choices with negative global impacts. Specific methods, such as conscious breathing and heart awareness, are explained so readers can practice aspects of these dynamics and recognize how their own micro-level choices may lead to macro-level impacts. Emphasis is placed on the inherent human design to expand from self-awareness to group awareness to global awareness as we wake up to our own and others hearts. Hope for all of life lives here.
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Cao, Chunhua, and Yazhen Wang. "Facile Synthesis and Supercapacitive Properties of PDA/UiO-66 Composites." In Advances in Transdisciplinary Engineering. IOS Press, 2023. http://dx.doi.org/10.3233/atde230443.

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UiO-66 in Zr-MOFs materials stands out in the research of supercapacitors due to its large specific surface, high stability and high heat resistance. In this paper, pure UiO-66 was successfully prepared using solvothermal method, and three PDA/UiO-66 composites with addition mass ratio of UiO-66 and dopamine of 2:1, 3:1 and 4:1 were prepared by autopolymerizing dopamine hydrochloride to form polydopamine at room temperature. The materials’ morphology and structure were examined using SEM, TEM and XRD, and the capacitive performances were analyzed by CV and GCD. The results indicated that the capacitor properties of UiO-66 could be improved to a certain extent with the appropriate amount of polydopamine coating. The PDA/UiO-66 composite with a mass ratio of 2:1 displayed a high specific capacitance of 822.04 F/g at 1 A/g, and maintained good capacity retention even after 4000 charge/discharge cycles in a three-electrode system. These results suggested that the PDA/UiO-66 composite had great potential as a supercapacitor electrode material.
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Conference papers on the topic "Specific heat capacities"

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Giering, K., I. Lamprecht, and Olaf Minet. "Specific heat capacities of human and animal tissues." In BiOS Europe '95, edited by Guy P. Delacretaz, Rudolf W. Steiner, Lars O. Svaasand, Hansjoerg Albrecht, and Thomas H. Meier. SPIE, 1996. http://dx.doi.org/10.1117/12.229547.

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Yu, Jun, Zhen’an Tang, Fengtian Zhang, Haitao Ding, and Zhengxing Huang. "Heat Capacity of Copper Thin Films Measured by Micro Pulse Calorimeter." In ASME 2008 6th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2008. http://dx.doi.org/10.1115/icnmm2008-62050.

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Thermal properties of thin films may differ from the bulk value due to the differences in microstructure, such as the grain size, impurities and defects. Heat capacity is one of the thermophysical properties and it is measured by calorimetry. However, traditional calorimeters can’t measure heat capacity of thin films which are quasi-2D and has small heat capacity. Recently, micro calorimeters with suspending membrane structure have been developed to measure the heat capacity of ultra thin films with thickness of sub-micrometer to nanometer scale. Efforts are focused on reducing heat capacitance of the addenda and minimizing the thermal link so as to permit an adiabatic measurement of the heat capacity of thin film. In this paper, a micro pulse calorimeter was developed and heat capacities of the copper thin films were measured by the micro pulse calorimetry. The heating rate of the micro calorimeter is up to 200K/ms with heating power of 4.5mW, and the heat capacity of the calorimeter is about 23.4nJ/K at 300K. Heat capacities of polycrystalline copper thin films with thickness from 20nm to 340nm were measured in the temperature range from 300K to 420K in vacuum of 1mPa. In order to extract the specific heat of the Cu films, mass of the films was calculated with volume and density of the sample film. The specific heat of the Cu films was compared with the literature values of bulk Cu. The specific heat of the 340nm Cu film is close to the literature data of bulk Cu. For the thinner films, enhanced specific heat was observed, and the data shows that the specific heat increases with the decreasing of crystalline size and film thickness.
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O’Hanley, Harry, Jacopo Buongiorno, Thomas McKrell, and Lin-wen Hu. "Measurement and Model Correlation of Specific Heat Capacity of Water-Based Nanofluids With Silica, Alumina and Copper Oxide Nanoparticles." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-62054.

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Nanofluids are being considered for heat transfer applications. However, their thermo-physical properties are poorly known. Here we focus on nanofluid specific heat capacity. Currently, there exist two models to predict a nanofluid’s specific heat capacity as a function of nanoparticle concentration and material. Model I is a straight volume-weighted average; Model II is based on the assumption of thermal equilibrium between the particles and the surrounding fluid. These two models give significantly different predictions for a given system. Using differential scanning calorimetry, the specific heat capacities of water based silica, alumina, and copper oxide nanofluids were measured. Nanoparticle concentrations were varied between 5wt% and 50wt%. Test results were found to be in excellent agreement with Model II, while the predictions of Model I deviate very significantly from the data.
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English, Timothy S., Thomas W. Kenny, Justin L. Smoyer, et al. "Anharmonic Phonon Dispersion Relations, Group Velocities, and Branch-Dependent Specific Heat Capacities Measured Directly From Molecular Dynamics Simulations at Finite Temperatures." In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and M. ASME, 2012. http://dx.doi.org/10.1115/ht2012-58459.

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Tiznobaik, Hani, and Donghyun Shin. "Experimental Study of the Effect of Nanoparticle Concentration on Thermo-Physical Properties of Molten Salt Nanofluids." In ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-12166.

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Abstract Increased in thermo-physical properties of molten salt nanofluids have been reported. These findings makes molten salts nanofluids one of the most promising thermal energy storage media. One of the main application of these types of materials are in concentrated solar power plants. In this study, an investigation is performed on nanofluids specific heat capacity mechanisms in order to provide a reasonable description of the specific heat capacity enhancement of nanofluids. Then, a comprehensive experiments are performed on the effects of nanoparticles concentration on the specific heat capacity and materials characterization of molten salt nanofluids. This study is performed to analyze the optimum amount of nanoparticle and find the way to maximize the effects of nanoparticle on thermophysical properties of molten slat. Different molten salts nanofluids with varying nanoparticles concentration were synthesized. The specific heat capacities of mixtures were measured by a modulated scanning calorimeter. Moreover, the material characterization analyses were performed using scanning electron microscopy to investigate the micro-structural characterization of different nanofluids.
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Hölzl, Reinhold. "Lifetime Estimation of Aluminum Plate Fin Heat Exchangers." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78343.

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Aluminum Plate Fin Heat Exchangers (Al-PFHE) are often used in low temperature applications of chemical plants when huge heat transfer capacities are required. Typically the equipment is insulated or installed in insulated containments — so called “Cold Boxes”. Al-PFHE may either fail by corrosion or by mechanical overload due to trip scenarios or blockage / fouling. No failures due to mechanical overload should occur under the conditions of the ALPEMA [9] guideline (ALPEMA = Aluminum Plate-fin Heat Exchanger Manufacturer’s Association). However, ALPEMA doesn’t describe all operational situations in the exchanger block itself and the ALPEMA load conditions are not followed in all cases. The specific design of Al-PFHE does not allow standard inspection and maintenance procedures, which makes it difficult to evaluate the equipment condition and the expected remaining service life. Corrosion, blockage, fouling, and mechanical/thermal overload are the key degradation mechanisms that operators need to control to avoid premature failure of their aluminum plate fin heat exchangers. This paper describes how to incorporate finite element analysis and dynamic process simulation in the design and operation to evaluate the lifetime of Al-PFHE.
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7

Warzoha, Ronald J., Anthony Rao, Rebecca Weigand, and Amy S. Fleischer. "Experimental Characterization of the Thermal Diffusivity of Paraffin Phase Change Material Embedded With Herringbone Style Graphite Nanofibers." In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58043.

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Phase change materials (PCMs) are promising candidates for thermal energy storage due to their intrinsically high values of latent heat. However, PCMs are unable to effectively utilize all of their energy storage capacities due to their poor thermophysical properties. In this study, the effect of graphite nanofibers (diameter = 2 to 1000 nm, length = 100μm) on the bulk thermal properties of paraffin PCM (Tmelt = 56 °C) is investigated. Material properties including effective thermal conductivity, specific heat, latent heat, melt temperature and thermal diffusivity are measured using a Differential Scanning Calorimeter (DSC) and comparative reference bar apparatus. Results suggest that the addition of nanostructures not only increases thermal conductivity by up to 180%, but also reduces the specific heat capacity and density of nano-enhanced paraffin, leading to improved thermal diffusivity and thus greater utilization of its latent heat for transient thermal energy storage.
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8

Cho, Heejin, Rogelio Luck, and Louay M. Chamra. "Power Generation and Heat Recovery Model of Reciprocating Internal Combustion Engines for CHP Applications." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11634.

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This paper presents a power generation and heat recovery model for reciprocating internal combustion engines (ICEs) that can be effectively used in simulations of combined heat and power (CHP) systems. Reciprocating engines are among the most common types of power generation units in CHP systems. In the literature, constant engine efficiencies or empirical efficiency curves are commonly used in the simulations for CHP performance evaluation. These methods do not provide realistic results for the design and component selection processes. The main advantage of this model is that it provides estimates of performance/efficiency maps for both electrical power output and useful thermal output for various capacities of engines without experimental data. The intent of this model is to provide performance/efficiency maps during a preliminary CHP design/simulation process. An example of model calibration to a specific CHP application is presented to demonstrate the capability and benefit of this model. The simulation results are validated with manufacturer’s technical data.
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9

Gao, Hongxia, Jianzu Yu, and Lei Yu. "Experimental Researches on Thermal Properties of Dielectric Thin Films With Weak Mechanical Intensity." In ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer. ASMEDC, 2009. http://dx.doi.org/10.1115/mnhmt2009-18457.

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Thermophysical properties of dielectric thin films are essential for researching on the thermal performance of microelectronic, optoelectronic and MEMS devices as well as for their reliability. The Joule-heating experimental method of the double-layer free-standing thin-film structure is used to determine the thermophysical properties of SiO2 and Al2O3 thin films by experiment. The thin films are deposited on the SiNx thin film by PECVD and EBE respectively. The results show that the thermal conductivity of both thin films have the obvious size effect. The value is merely a fraction of the one reported for each bulk specimen, and is coincident with the calculated Minimum Thermal Conductivity (MTC). The measured specific heat capacities are almost the same as those of the corresponding bulk. The steady state heat flow of SiO2/SiNx and Al2O3/SiNx membranes in the measurement is analyzed. The thermal radiation of the thin films always takes a large portion of total heat rejection. Therefore it can not be ignored as many macroscale thermal measurements always do.
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10

Bellos, Evangelos, Saša Pavlović, Mića Vukić, Branka Nakomčić-Smaragdakis, and Mirjana Laković. "Theoretical thermodynamic analysis of the Organic Rankine Cycle." In SimTerm Proceedings 2024 - 21st International Conference on Thermal Science and Engineering of Serbia : [proceedings], Niš, 22-25.10.2024. University of Niš, Faculty of Mechanical Engineering, Serbia, 2024. https://doi.org/10.5937/simterm24276b.

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The present work is a theoretical investigation of the organic Rankine cycle (ORC). A simplified cycle is studied aiming to determine the ORC thermodynamic efficiency in an analytical and simplistic way. Reasonable assumptions have been made and the methodology is based on an analysis of the cycle depiction in the temperature - specific entropy diagram. An analytical solution for the ORC efficiency was developed using the low cycle temperature, the high cycle temperature, the superheating degree, the liquid and vapor-specific heat capacities and the fluid latent heat at the high-temperature level. The reported mean deviation of the suggested analytical model compared to the detailed thermodynamic one was found at 5.03% which is an acceptable value. Moreover, analytical approximations for the efficiency with regression models were created for three different working fluids names n-pentane, toluene and R600. The present approach can be extended to extra working fluids and operating conditions and the present work consists of the first step for the establishment of this methodology.
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