Relevant bibliographies by topics / Hygroscopic performance

Academic literature on the topic 'Hygroscopic performance'

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Published: 14 March 2023

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Journal articles on the topic "Hygroscopic performance"

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Yu, Shui, Yumeng Cui, Yifei Shao, and Fuhong Han. "Research on the Comprehensive Performance of Hygroscopic Materials in an Office Building Based on EnergyPlus." Energies 12, no. 1 (January 8, 2019): 191. http://dx.doi.org/10.3390/en12010191.

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This paper presents the research status of hygroscopic materials, points out the weak links as targets for major breakthroughs, and introduces humidifying mechanisms and their categories. In this paper, we simulated a single-monomer Shenyang office building with different envelopes of inner-surface hygroscopic materials for indoor humidity conditions, energy consumption, and economy, which are three aspects of energy consumption analysis in EnergyPlus software. To obtain the best moisture buffering performance from hygroscopic materials, we also simulated different cases including the laying area, ventilation strategy, thickness, and initial moisture content of different hygroscopic materials. The humidity fluctuation, with changes in the style of hygroscopic materials and usage conditions, of a room in a building can be analyzed by numerical simulation. This allows the determination of the best moisture buffering performance of the building structure. The results show that hygroscopic materials have great advantages in three energy saving aspects of building assessment. Hygroscopic materials can regulate indoor air humidity and reduce energy consumption. In addition, the entire life-cycle cost can be minimized. Lower rates of air exchange and larger usable areas can help enhance the level of performance of hygroscopic materials. The thickness and initial moisture content of hygroscopic materials have little impact on the moisture buffering value. This study strived to provide a theoretical basis and technical guidance for the production and installation of hygroscopic materials. It also promoted the passive materials market and the building’s energy savings. The best moisture buffering performance, evaluated at room level in this paper, can be obtained through real-world environmental simulation.
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Wong, E. H., R. Rajoo, S. W. Koh, and T. B. Lim. "The Mechanics and Impact of Hygroscopic Swelling of Polymeric Materials in Electronic Packaging." Journal of Electronic Packaging 124, no. 2 (May 2, 2002): 122–26. http://dx.doi.org/10.1115/1.1461367.

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A reliable technique for characterizing the hygroscopic swelling of materials has been developed and used to characterize a number of packaging materials. Using these data, hygroscopic stress modeling were performed. The hygroscopic stress induced through moisture conditioning was found to be significant compared to the thermal stress during solder reflow. Hygroscopic stress in over-molded wire bond PBGA and molded Flip Chip PBGA was found to be 1.3 times to 1.5 times that of thermal stress. Hygroscopic swelling of the underfill in FCPBGA was found to be the main failure driver during autoclave test. Autoclave performance of FCPBGA package assembled with different underfills and chips were analyzed. Excellent correlation was found between autoclave performance and the hygroscopic swelling characteristics of the underfills.
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Wang, Feng Xian, Fu Xin Yang, and Xue Mei Liu. "Preparation and Performance Study of Hygroscopic Film." Applied Mechanics and Materials 200 (October 2012): 360–64. http://dx.doi.org/10.4028/www.scientific.net/amm.200.360.

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PVA hydroscopic films were prepared by solution and tape casting method. PVA 1799 was selected as the best material of hygroscopic film. This work evaluated the effect of PVA concentration, glycerol and methylcellulose (MC) on mechanical property, transmittance and absorbability of the film. The result showed that the transmittance of PVA film was high, and that plasticizer and MC had little effect on it; while the addition of MC affected the haze of PVA film greatly, the haze increased along with the increasing of adding amount of MC. The suitable concentration of PVA, glycerol and MC was 7%, 0.8%, 0.18%, respectively..
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Wang, Ying, and Li Ren Fan. "Preparation and Hygroscopic Property of the Polyacrylamide/MgCl2 Hybrid Hydrogel." Advanced Materials Research 550-553 (July 2012): 904–7. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.904.

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Polyacrylamide/MgCl2 hybrid hydrogel desiccant was prepared from magnesium chloride and polyacrylamide by aqueous solution polymerization. The hybrid hydrogel was synthesized and characterized by X-ray diffraction. The effect of the experimental factors such as content of magnesium chloride, concentration of cross-linking agent, initiator content on hygroscopic performance of the hybrid hydrogel were investigated, furthermore, the hygroscopic swelling kinetic process of the hybrid hydrogel was studied. The results indicate that hybrid hydrogel possessed preferable hygroscopic property under the optimum conditions, the hygroscopic swelling degree achieving 172%. The hygroscopic swelling process of the hybrid hydrogel follows the kinetic pseudo-second-order model, in addition, the swelling rate decreases with the increase of relative humidity.
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Cai, Chenyang, and Fanding Zhou. "Sorption Characteristic of Thermally Modified Wood at Varying Relative Humidity." Forests 13, no. 10 (October 14, 2022): 1687. http://dx.doi.org/10.3390/f13101687.

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Thermal modification (TM) is commonly used for improving the performance of wood under varying environmental conditions. The effect of TM on the hygroscopic properties of wood has been studied extensively; however, the sorption mechanism and the states of water of thermally modified wood (TMW) at varying relative humidity (RH) is limited. In this work, Douglas fir was modified at 180 °C, 200 °C and 220 °C for a duration of 2 h and the Hailwood–Horrobin model and NMR relaxometry were used after specimens were conditioned at eight different RHs. The results showed that TM inhibited monolayer and polylayer moisture sorption with increasing modification temperatures in all RHs. The lower slope of the sorption isotherms in TMW decreased compared with the control, indicating that the TM increased the hygroscopical stability of wood. The T2 distribution indicated that no free water was observed in the hygroscopic moisture range. The mobility of water molecules in the cell walls was decreased by TM intensity and increased by increasing RH.
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Sandberg, H. G. O., T. G. Bäcklund, R. Österbacka, and H. Stubb. "High-Performance All-Polymer Transistor Utilizing a Hygroscopic Insulator." Advanced Materials 16, no. 13 (July 5, 2004): 1112–15. http://dx.doi.org/10.1002/adma.200400030.

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Cui, Yi, Shuyi Gao, Ruiyun Zhang, Longdi Cheng, and Jianyong Yu. "Study on the Moisture Absorption and Thermal Properties of Hygroscopic Exothermic Fibers and Related Interactions with Water Molecules." Polymers 12, no. 1 (January 4, 2020): 98. http://dx.doi.org/10.3390/polym12010098.

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The aim of this paper is to study the hygroscopic behavior of hygroscopic exothermic fiber-based materials and to obtain a better understanding of the thermal performance of these fibers during the moisture absorption process. The temperature distribution of different kinds of hygroscopic exothermic fibers in the process of moisture absorption, observed by infrared camera, demonstrated two types of heating performance of these fibers, which might be related to its hygroscopic behavior. Based on the sorption isotherms, a Guggenheim-Anderson-de Boer (GAB) multi-layer adsorption model was selected as the optimal moisture absorption fitting model to describe the moisture absorption process of these fibers, which illustrated that water sorption capacity and the water–fiber/water–water interaction had a significant influence on its heating performance. The net isosteric heats of sorption decreased with an increase of moisture content, which further explained the main factor affecting the heat dissipation of fibers under different moisture contents. The state of adsorbed water and water vapor interaction on the fiber surface were studied by simultaneous thermal analysis (TGA-DSC) measurement. The percentage of bound and unbound water formation at low and high humidity had a profound effect on the thermal performance of fibers. It can therefore be concluded that the content of tightly bound water a strong water–fiber interaction was the main factor affecting the heating performance of fibers at low moisture content, and the content of loosely bound water reflected that water sorption capacity was the main factor affecting the heating performance of fibers at high moisture content. This was further proven by the heat of desorption.
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Kumari, Pinki, Kuldeep Singh, and Anuj Singal. "Reducing the Hygroscopic Swelling in MEMS Sensor using Different Mold Materials." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 1 (February 1, 2020): 494. http://dx.doi.org/10.11591/ijece.v10i1.pp494-499.

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Today, Hygroscopic swelling is one of the biggest challenging problem of Epoxy mold compound (EMC) in packaging with Microelectromechanical system (MEMS) devices. To overcome this hygroscopic swelling problem of EMC and guard the devices, MEMS devices are molded in this paper with different Mold Compound (MC) i.e. titanium and ceramic etc. during their interconnection with the board. Also, a comparatively performance analysis of this various mold compound with MEMS pressure sensor has been studied in this paper at 60% humidity, 140 mol/m<sup>3</sup> saturation concentration and 25 <sup>o</sup>C. It was observed that hygroscopic swelling does not take place in the titanium mold compound. But, titanium is very costly so we have to consider something cheaper material i.e. ceramic in this paper. The Hygroscopic swelling in Ceramic Mold Compound after 1 year is nearly 0.05mm which is very less than epoxy.
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Ruivo, C. R., J. J. Costa, and A. R. Figueiredo. "On the behaviour of hygroscopic wheels: Part II – rotor performance." International Journal of Heat and Mass Transfer 50, no. 23-24 (November 2007): 4823–32. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2007.03.004.

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BUSS TESSARO, ALESSANDRA, RAFAEL DE AVILA DELUCIS, SANDRO CAMPOS AMICO, DARCI ALBERTO GATTO, and MARGARETE REGINA FREITAS GONÇALVES. "CEMENT COMPOSITES REINFORCED WITH TEOS-TREATED WOOD FIBRES." Cellulose Chemistry and Technology 55, no. 1-2 (February 12, 2021): 141–47. http://dx.doi.org/10.35812/cellulosechemtechnol.2021.55.15.

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In this study, wood fibres were extracted from eucalyptus and pine woods, treated by immersion in tetraethyl orthosilicate (TEOS) and incorporated into a cementitious matrix at three weight contents (2 wt%, 5 wt% and 10 wt%). The fibres were characterized using chemical and morphological analyses and the cement-based composites were evaluated using chemical, hygroscopic, mechanical and morphological tests. The morphological and spectroscopic results satisfactorily justified the physical-mechanical properties. The wood fibre-cement composites reached similar water uptake and apparent porosity to those of the neat mortar, but exhibited higher mechanical properties. Furthermore, all treated fibres yielded composites with improved mechanical and hygroscopic properties compared to those with pristine fibres. Overall, the best performance (based on hygroscopic and mechanical results) was obtained for the wood fibre-cement composite with 2 wt% pine fibres.
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Dissertations / Theses on the topic "Hygroscopic performance"

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RONZINO, AMOS. "Influence of hygroscopic interior finishing on indoor comfort conditions." Doctoral thesis, Politecnico di Torino, 2014. http://hdl.handle.net/11583/2549737.

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Indoor humidity level is important for building performance and occupants. The durability of building components is directly related to the humidity condition and materials inside buildings can get damaged if they are persistently under high levels of moisture concentration. The indoor humidity level is related to the room factors including moisture gains and ventilation conditions and to the moisture ab/desorption capacity of hygroscopic materials for interior finishing or furnishing of the building. The phenomenon of the indoor humidity level being dampened by the dynamic moisture interactive process between hygroscopic materials and indoor air is recognized as moisture buering effect. The buffering effect and the moisture ab/desorption performance of hygroscopic materials under different room factors were studied in this thesis by means of numerical simulation. The transient state indoor environment influenced by room factors, taking into account the moisture interactive process between indoor air and enclosure, was investigated numerically in this thesis. The CFD technique was employed in the numerical investigation.
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Jain, Dharamdeep. "Humidity Driven Performance of Biological Adhesives." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510053266807976.

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Kamble, Sharad R. "Molecular interactions in pharmaceutical preformulation and supramolecular complexes. Structural properties governing drug-plasma protein binding and investigation of amino acids co-crystals." Thesis, University of Bradford, 2018. http://hdl.handle.net/10454/16882.

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The study of pharmaceutical preformulation includes the evaluation of pharmacokinetic, pharmacodynamic and physicochemical properties of the drug molecules that aid the formulation. However, it has a limited role in determining drug dosage optimisation in the formulation. The study of drug-Plasma Protein Binding (PPB), and the lipophilicity, solubility, and ionic behaviours of the desired drug molecules addresses the gap and enhances our undertraining related to the behaviour of the drug molecules in the body. The High-Performance Liquid Chromatography (HPLC) technique was used in the current study to assess drug-PPB interaction. Using Michael Abraham’s ‘Linear Free Energy Relationship’ (LFER) method, two major plasma proteins namely, Human Serum Albumin as HSA and α-1-Acid Glycoprotein as AGP, were used and the structural properties governing drug-plasma protein binding was determined. This is the first time that the effect of ionised species on PPB has been quantitatively evaluated. In addition, the molecular interactions also play a key role in the supramolecular complexes of co-crystals. The project also evaluated the co-crystallisation process and its effect on physicochemical properties of the drug. In the current study, amino acids (AAs) have been observed to be a prominent source of coformers. The AAs showed co-crystals formation with carboxylic acids, nonsteroidal anti-inflammatory drug (NSAID) and citric acid which overcome the hygroscopicity problems and improved the physical stability issues during storage. This study has also identified a new formulation which is helpful for improvement in the stability of effervescent tablets at various relative humidity (RH) conditions which will reduce the manufacturing cost associated with the production of effervescent tablets.
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Zhu, Yin. "A Rapid, Small-Scale Method for Improving Fermentation Medium Performance." The University of Waikato, 2007. http://hdl.handle.net/10289/2444.

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Cell biomass and chemicals (e.g. bioactive compounds) can be produced by fermentation. Optimising a fermentation system involves optimizing many variables such as determining the effect of inoculum quality and media components, and selecting the most appropriate fermenter design and operating conditions (such as agitation aeration and fermentation mode). Identifying the optimal media is very important because it can significantly affect product concentration, yield and productivity. However, the media contains many components so many trials need to be done, which makes the process laborious, expensive, open-ended, and often time-consuming. The data generated from the many trials can be difficult to analyse. This study developed a rapid, inexpensive small-scale technique to identify how media components affected the growth of Streptomyces hygroscopicus and its production of a secondary metabolite, the anti-tumour agent rapamycin. A method was developed using microtitre plates to screen the effect of three concentrations of nine media components on cell growth and rapamycin production using the Box-Behnken experimental design. Firstly, the methodology for microtitre plates was developed, which involved characterizing the physical parameters of a fermentation system, identifying the incubation time to minimize evaporation, modifying the assay method to deal with the small sample volumes, and developing an alternative method to determinate the rapamycin concentration that was cheaper than the HPLC method. Data from shake flasks trials (the normal screening method) were used to validate the microtitre method and to assess the latter's usefulness in predicting scale-up effects. Six media components - sodium chloride (NaCl), di-potassium orthophosphate (K2HPO4), l-aspartic acid, l-arginine, l-histidine and salt (formula 1) solution - significantly affected culture growth and/or rapamycin concentration. The regression tree method was used to indicate the importance and critical concentration range of each factor. The Pearson's product-moment value indicated a good correlation between data from microtitre plates and shake flasks (cell growth: r=0.75 p=0.016 n=8; rapamycin concentration r=0.92 p=0.08 n=6). The speed of the microtitre plate and shake methods were compared by assessing the total cycle time and the time required for various stages in the method. Performance of each method was assessed as cost of media and equipment. Using microtitre plates to screen and optimise media in terms of biomass and secondary metabolite production is faster and cheaper than using shake flasks. Labour efficiency for the numerous, repetitive, small-scale experiments was substantially increased. Trials could be run without well-to-well cross contamination. The regression tree statistics methodology successfully showed the effect of input variables on target variables and identified effective medium component concentrations and any interactions. It is recommended that the microtitre plate procedure developed in this research may be applied to any study investigating the optimum media composition for growing other Streptomyces spp. strains, in screening studies when searching for new bioactive molecules, or for characterizing natural or recombinant/mutated micro-organisms.
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Labat, Matthieu. "Chaleur - Humidité - Air dans les maisons à ossature bois : Expérimentation et modélisation." Phd thesis, INSA de Lyon, 2012. http://tel.archives-ouvertes.fr/tel-00790809.

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L'évolution actuelle des exigences en termes de performance énergétique des bâtiments a fait apparaître de nouveaux enjeux et problématiques scientifiques, dont ceux liés à l'humidité. Cette étude s'appuie sur une cellule expérimentale construite sur la technologie des maisons à ossature bois et soumise aux conditions climatiques réelles de Grenoble. L'instrumentation de ce bâtiment et le suivi de l'évolution en température et en humidité dans les différentes couches de l'enveloppe permettent de définir des séquences nécessaires à la validation de modèles numériques. Dans cet objectif, un modèle existant nommé HAM-Tools a été utilisé pour simuler les transferts couplés de chaleur, d'air et d'humidité à l'échelle du bâtiment. La démarche de validation a été décomposée en plusieurs étapes, de manière à cibler des transferts spécifiques et d'en améliorer la modélisation. Ces études localisées concernent les transferts couplés de chaleur et de masse à travers les parois solides, la modélisation des transferts de chaleur à travers une lame d'air ventilée et enfin la modélisation du renouvellement de l'air intérieur en conditions naturelles. Pour estimer la précision globale du modèle, c'est-à-dire à l'échelle du bâtiment, une séquence expérimentale a été simulée en prenant en compte l'ensemble des transferts couplés simultanément. Les performances du modèle sont discutées à partir des mesures locales, c'est-à-dire dans les parois, puis globales. La bonne concordance entre mesures et résultats de simulation permet de conclure sur la validité et la généricité de la démarche mise en œuvre et les hypothèses de simulation. Plus particulièrement, il est apparu que l'outil de modélisation permet de prédire correctement le comportement moyen des parois en humidité et en température. Il est donc envisageable de l'utiliser pour simuler et estimer l'impact des constituants des parois en termes de durabilité, de performances énergétiques et de confort de l'occupant.
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Chiu, Tsai-Wei, and 邱采薇. "Improvement of PEMFC Performance by Coating Hygroscopic ZnO on the Anodic Catalyst Layer." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/61392048851027272246.

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碩士
國立中興大學
材料科學與工程學系所
98
In the past decade, the awareness of environment preservation and the rapid increase of global oil price have aroused the investigation of new energy resources applied in transportation, portable devices and stationary equipments in the near future. Proton exchange membrane fuel cells (PEMFCs), which employ Nafion® membrane as solid proton conducting membrane, with several advantages such as high energy density, high energy conservation efficiency and near-zero pollutant are recognized as a promising alternative to be widely applied in transportation, residence and portable devices in the near future. However, a severe decrease in proton conductivity of Nafion® membrane is observed when operating temperature increases to 100℃. This phenomenon is attributed to the low hydration level of Nafion® membrane caused by serious water loss at high temperature and, therefore, limits the operation temperature of PEMFCs. Generally, for operating PEMFCs at the temperature higher than 120℃, an external humidifying system used to maintain appropriate hydration level of Nafion® membrane is indispensable. Nevertheless, this excess humidifying system increases the complexity of the PEMFC structure which poses a great obstacle to the commercialization of PEMFCs. Thus, to solve this problem, a versatile membrane electrode assembly (MEA) capable of maintaining optimum hydration level at dehydration conditions without the assistance of external humidifying system is desired This study aims to investigate the feasibility of coating hygroscopic zinc oxide, which used as water adsorbent due to the Lewis acid sites distributed over it surface, on the anodic catalyst layer to main appropriate hydration level at anode under dehydration condition. Different anode humidifier temperatures at 25 ℃, 45 ℃, 55 ℃ and 65 ℃ were designed to investigate the influence of anode humidification conditions on cell performance. The temperature of cell and the cathode humidifier were both fixed at 60 ℃. The polarization measurement was conducted at ambient conditions. It was found that cell with anode catalyst layer coated with 30 seconds zinc oxide revealed the best performance at anode humidifier temperatures ranging from 25 to 65 ℃ due to the smallest negative influence on electronic resistance.
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Chao, Wen-Kai, and 趙文愷. "Effect of adding hygroscopic metal and metal oxide particles in the anode catalyst layer on the PEMFC performance by PVD and ultrasonic techniques." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/70576240352246007945.

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博士
國立中興大學
材料科學與工程學系所
99
An adequate water management system to avoid the drying and flooding phenomena of the membrane electrode assembly (MEA) and an effective CO-tolerant catalyst are still the two main challenges needed to be overcome. Since the CO-poisoning phenomenon is induced by the low operation temperature (<100℃) of PEMFC limited by inappropriate water management, a well-established adequate water management system could solve these two challenges simultaneously. This study aims to investigate the feasibility of fabricating composite anode catalyst layer to increase the wettability of MEA at low humidity condition and then improve the performance of PEMFC. For fabricating composite anode catalyst layer, commercial and homemade ZnO hygroscopic particles were firstly added into the anode catalyst layer by ultrasonic technique. Secondly, island-like TiOx nano-particles were deposited on the surface of anode catalyst layer by direct sputtering for easing the negative effect caused by the inherent high electrical resistance of the hygroscopic metal oxide particles, by reducing the amount of hygroscopic metal oxide particles addition with same wettability improvement. Finally, Ti and Ti-V-Cr alloy were used as water adsorbent to be deposited on the surface of anode catalyst layer by direct sputtering for solving the dilemma caused by the inherent high electrical resistance of the hygroscopic metal oxide particles. To sum up, among all the specimens in which ZnO particles were added to the anode catalyst layer, the MEA with 10% ZnO particles addition exhibits the highest current density at different anode humidifier temperatures ranging from 25 to 65℃. Furthermore, the MEAs with anode sputtered by Ti all revealed better performance improvement than that sputtered with TiOx at low humidifying temperature (25, 45℃) even the TiOx-supttered anode showed better wettability than that of Ti-sputtered. At anode humidifier temperature 25℃ and 45℃, the highest improvement of Ti-V-Cr-sputtered MEAs with 100V bias were 35% and 26%, which are higher than the MEAs added with ZnO, sputtered with Ti and sputtered with TiOx. For the MEAs with transition metal oxide water adsorbent (ZnO and TiOx) at anode, the cell performance is determined by a competition mechanism between wettability and the variation of electrical resistance caused by transition metal oxide water adsorbent addition. Furthermore, for the MEAs with metal adsorbent, the cell performance was mainly determined by a competition mechanism between the positive effect arose from the enhancement of wettability of anodic catalyst layer and the negative effect of flooding induced by the excess hygroscopic metal (Ti and Ti-V-Cr).
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Yeh, Yao-Ting, and 葉耀婷. "The performances of silicates hygroscopic materials." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/39337948595900654952.

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碩士
元智大學
化學工程與材料科學學系
97
The purpose of this research is to study the performances of silicates hygroscopic materials(diatomaceous, zeolite powder and meerschaum powder). About the tooling, we use SEM to observe sample external, XRD to analyse contents, MIP to analyse the size of apertures, BET to measure sample superficies. Furthermore we also to control the environment humidity to compare the hygroscopic ability of each sample.
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Book chapters on the topic "Hygroscopic performance"

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Olofinjana, Ayodele, Nicholas Jays, David Young, Jitendra Mata, and Rezwanul Haque. "Hygroscopic Performance of Sulphate-Based MgO Construction Boards." In Advances in Manufacturing Processes, Intelligent Methods and Systems in Production Engineering, 390–401. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-90532-3_30.

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Ramos, Nuno M. M., and Vasco Peixoto de Freitas. "The Evaluation of Hygroscopic Inertia and Its Importance to the Hygrothermal Performance of Buildings." In Advanced Structured Materials, 25–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-21966-5_2.

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Saxena, Gaurav, and M. K. Gaur. "Case Study on Thermal and Drying Performance Index of Hybrid Solar Dryer with Evacuated Collector." In Solar Thermal Systems: Thermal Analysis and its Application, 301–21. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050950122010015.

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Solar drying is one of the oldest and most popular food preservation methods that involve moisture removal by a complex heat and mass transfer phenomenon. The process of the drying system is dependent on a number of operating parameters. In the present chapter determination of thermal and drying performance parameters is discussed. A hybrid solar drying system with the integration of an evacuated water tube solar water heater is installed and tested for drying hygroscopic leaf crops. The drying performance of the hybrid system is evaluated in terms of mass reduction and its derived influence on moisture content and drying rate. The derived parameters are compared with the corresponding evaluations under open sun drying. The rise in greenhouse environment temperature and crop surface temperature at hourly intervals as compared to the ambient condition were used as parameters for the thermal performance of dryer. The average values of SMER were 60% lesser than that of the simple PVT-hybrid system (without ETSC), but the drying performance parameters of mass reduction, drying rate and mass shrinkage ratio provide favourable results. The drying time was reduced by 3.5 and 2.5 hours, respectively, for the present sample size of two crops as compared to the open sun drying.
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Conference papers on the topic "Hygroscopic performance"

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Perier-Muzet, Maxime, Timea Béjat, Monika Woloszyn, Yannick-Ariel Kêdowidé, Catherine Buhé, and Etienne Wurtz. "Evaluation of the Contribution of Highly Hygroscopic And Vapour Permeable Walls to Whole Building Performance." In 2015 Building Simulation Conference. IBPSA, 2015. http://dx.doi.org/10.26868/25222708.2015.2525.

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Bastien, Diane, and Martin Winther-Gaasvig. ""Hygrothermal Performance of a Hygroscopic and Permeable Wall Assembly: Impact of a Vented Wall Cavity"." In 7th International Building Physics Conference. Syracuse, New York: International Association of Building Physics (IABP), 2018. http://dx.doi.org/10.14305/ibpc.2018.be-9.02.

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Zhu, Dongsheng, Xuebo Li, Huijun Wu, and Nan Wang. "Performance Analysis of Composite Sorbents in Thermal Energy Storage System." In 2007 First International Conference on Integration and Commercialization of Micro and Nanosystems. ASMEDC, 2007. http://dx.doi.org/10.1115/mnc2007-21588.

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Composite adsorbents, prepared by impregnating hygroscopic salt into silica gel pores are considered as promising storage materials in space heating for their high specific storage density and low regenerating temperature. In this paper, a numerical model of the adsorber heat exchanger was developed. Four kinds of composite adsorbents were tested under different conditions. The experiments were conducted to investigate the effect of their nature, the regenerating temperature, the air flow rate and number of transfer unit on the thermal storage performances. The results reveal that thermal storage performances increases significantly with CaCl2 concentration ranged from 10% to 40%. COP declines with the regenerating temperature and air flow rate, ranged from 80°C to 90°C and 4 m3/min to 6 m3/min respectively, while NTU is another case. The optimization of thermal performance of TES can be achieved by compromising between the above factors.
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Mian, Ahsan, and Jesse Law. "Finite Element Analysis of Laser Fabricated Microjoint Performance in Cerebrospinal Fluid." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33900.

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Assessment of neural biocompatibility requires that materials be tested with exposure in neural fluids. Laser bonded microjoint samples made from titanium foil and polyimide film (TiPI) were evaluated for mechanical performance before and after exposure in artificial cerebrospinal fluid (CSF) for two, four and twelve weeks at 37°C. These samples represent a critical feature i.e., the microjoint — a major weakness in the bioencapsulation system. The laser microbonds showed initial degradation up to four weeks which then stabilized afterwards and retained similar strength until twelve weeks. To understand this bond degradation mechanism better, a finite element modeling approach was adopted. From the finite element results, it was revealed that the bond degradation was not owing to the hygroscopic expansion of polyimide. Rather, relaxation of the process induced residual stresses may have resulted in weakening of the bond strength as observed from experimental measurements.
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Rad, Milad Rezvani, André McDonald, Morvarid Mohammadian Bajgiran, and Christian Moreau. "Microstructural and Performance Analyses of Thermally Sprayed Electric Resistance Heating Systems as De-Icing Elements." In ITSC2019, edited by F. Azarmi, K. Balani, H. Koivuluoto, Y. Lau, H. Li, K. Shinoda, F. Toma, J. Veilleux, and C. Widener. ASM International, 2019. http://dx.doi.org/10.31399/asm.cp.itsc2019p0512.

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Abstract This study investigates the microstructure and efficiency of coating-based heating elements produced by deposition of various powders, including aluminum oxide (Al2O3), alumina-titania (Al2O3-TiO2), nickel-chromium (NiCr), and copper, using flame spraying, suspension plasma spraying, high-velocity oxyfuel (HVOF) spraying, and cold spraying techniques. The main goals are to assess the dielectric strength of flame and plasma sprayed alumina, compare the electrical resistivity of HVOF and flame sprayed NiCr, and obtain coating cross-sectional images to shed light on the challenges and potential of different heating element designs. The Al2O3 layer produced by suspension plasma spraying appeared to be more reliable due to its cauliflower-like structure, corundum content, and hygroscopic properties. Resistivity was found to be higher in the flame sprayed NiCr than in the HVOF deposit mainly due to discontinuities and imperfections such as cracks, pores, and oxygen content. The micrographs taken from sample cross-sections show penetration of flame-sprayed NiCr into the flame-sprayed Al2O3 and Al2O3-TiO2 layers, which decreases the effective thickness of the dielectric. However, interlocking between NiCr and Al2O3-TiO2 coatings can be beneficial when cohesion is a concern.
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Dutra, Thiago Assis, Catarina Costa, João R. Matos, Bruna F. Oliveira, Luís Miguel Oliveira, and Cristiano Pereira Coutinho. "Effects of Printing Parameters on Geometrical and Mechanical Properties of 3D-Printed High-Performance Thermoplastics, Toward the Digitalization of Power Transformers." In 2022 International Additive Manufacturing Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/iam2022-91989.

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Abstract Traditionally, cellulosic materials have been applied in power transformers due to their good electrical insulation and oil absorption, although their hygroscopic characteristics consequently lead to time-consuming processes. Viewing to circumvent these limitations, the Additive Manufacturing of high-performance thermoplastics has been investigated as an alternative solution for solid insulation. In this context, the present work investigates the effect of process parameters on the geometrical and mechanical properties of 3D-printed Polyetheretherketone (PEEK) and Polyetherimide (PEI). To this end, the residual stresses and distortions are numerically computed considering different ranges of extrusion temperatures, printing speeds, and layer heights. Then, resulting elastic properties are predicted using the Asymptotic Homogenization technique. For that, two unit cells representing the microstructures found for the PEEK and PEI are adopted. From the obtained results, it was verified that lower layer heights and printing speeds, as well as higher extrusion temperatures, resulted in higher residual stresses. In contrast, higher layer heights, higher extrusion temperatures, and lower printing speeds resulted in higher distortions for both materials. In regards to the design of components, the obtained results provide useful data for both preliminary and critical analyses, potentially saving time and reducing waste of materials in future investigations involving 3D-printed high-performance thermoplastics.
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Bergero, Stefano, Anna Chiari, and Enrico Nannei. "Vapour Compression and Liquid Desiccant Hybrid System for Air Conditioning." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95541.

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The present study examines the performance of a hybrid air-conditioning system in which a vapour compression inverse cycle is integrated with an air dehumidification system working with hygroscopic solution and hydrophobic membrane. This approach may prove to be a valid alternative to the traditional summertime air-conditioning system, which involves cooling the air to below its dew point and subsequently reheating it. The system examined simultaneously cools and dehumidifies the air in an air-LiCl solution membrane vapour exchanger before it enters the conditioned environment. The LiCl solution is cooled by means of a vapour compression inverse cycle that uses the refrigerant KLEA 407C. The heat rejected by the condenser is used to regenerate the solution. A SIMULINK calculation programme was used to simulate the system in steady-state conditions. The performance of the system was analysed on varying significant operating parameters and was compared with that of a traditional direct-expansion air-conditioning plant. The results of the simulations revealed significant power saving which, in certain operating conditions, was as much as 50%.
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Rippy, Kerry, Judith Vidal, Shuang Cui, and Sumanjeet Kaur. "Mitigation of Leakage and Water Ingress for a Promising Phase Change Material (PCM) Containing Polyethylene Glycol (PEG)." In ASME 2022 16th International Conference on Energy Sustainability collocated with the ASME 2022 Heat Transfer Summer Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/es2022-85563.

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Abstract A promising and cost-effective phase change material (PCM) containing polyethylene glycol (PEG) 600, 800, and/or 1000 has been synthesized. It is shape stabilized using a sol-gel method and displays promising thermal properties. These properties make the PCMs good candidates for thermal batteries and other thermal energy storage applications in the building sector. However, PEG leakage is observed at elevated temperatures, and due to the hygroscopic nature of PEG, moisture ingress is also observed, which can have a significant effect on performance and durability. Thus, we have developed hydrophobic coatings to prevent PEG leakage and mitigate moisture ingress. The selected approach involves a secondary sol-gel process during which a thin layer formulated with hydrophobic precursors is deposited onto the surface of the PCM samples. Several coating formulations have been investigated, including formulations composed of tetraethyl orthosilicate (TEOS), diethoxy(dimethyl)silane (DEDMS), triethoxymethylsilane (TEMS), and n-octyltriethoxysilane (OTES). We find that this is effective at increasing hydrophobicity of the PCM substrates. It also decreases substrate leakage.
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Kong, Xujie, Ying Yu, Yuqiu Yang, Jungang Li, Mengyuan Liao, and Manabu Nomura. "Mechanical Property and Degradation in Hot Water of Injection Molded Glass Short Fiber/Wood Powder/Polypropylene Hybrid Composites." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64475.

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As well known, natural fibers absorb water easily that will affect the mechanical property considerably and there exists a problem of incompatibility which leads the weak interfacial adhesion between the fiber and the resin matrix because of the hygroscopic nature of natural fibers. Therefore, conducting hot water immersion and tensile test is necessary to study the mechanical property and degradation. In this study, glass fiber/wood powder/pp. hybrid composites were prepared by injection molding process at a fixed reinforcement to matrix ratio of 51:49. 3 kinds of hybrid specimens with glass fiber/wood powder ratios of 51:0, 21:30, and 0:51 were fabricated. The hydrothermal aging performance was investigated during the 80°C hot water immersion experiment with a series of immersion time and the effect of hot water immersion on the mechanical properties of composites have been evaluated based on the tensile test. Results showed that both the strength and modulus of hybrid composite decrease obviously as the immersion time increase, which can be considered that the hydroscopic property of natural fiber would decrease the durability of composite in humidity environment. And the skin-core structure comes from injection molded process contributes to the better hydrothermal aging property of Glass/PP composite.
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Bollina, Ravi, Janet Landgraf, Hannes Wagner, Robert Wilhelm, Sven Knippscheer, Gerhard Mitic, and Svetlana Levchuck. "Thermal Reliability and Environmental Testing of Advanced Metal Diamond Composites." In ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ipack2007-33028.

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Advanced diamond composites with matrix metal silver, copper and aluminum alloys were developed for heat sinks and base plates in high performance electronic packages. The reliability of these composites under extreme thermal and environmental conditions was investigated in the thermal cycling and pressure cooker tests. Thermal cycling tests on metal diamond composites were performed in a two chamber cycling oven between −55°C and +150°C for 1000 thermal cycles with 20 minutes storage time in each chamber. The effect of humidity and pressure was assessed from pressure cooker test at 121°C at 2 bar for 168 h. Thermal properties such as thermal diffusivity and specific heat were measured before and after the thermal cycling to observe any changes in thermal properties of the composites due to any possible interfacial degradation. The thermal properties of the composites did not decrease and the interfaces did not degrade after the thermal cycling tests in case of Ag-diamond composites. Al-diamond composites show a slight decrease of 5–8% in thermal diffusivity after thermal cycling. The thermal diffusivity of the Cu/Cr based diamond composite is unaltered before and after testing. The thermal diffusivity of Cu/Si diamond composites decreased by 43% at room temperature measured value. Al-diamond composites did not show any degradation during the pressure cooker tests although aluminum carbide is hygroscopic and deteriorates under moisture. Ag and Al-diamond composites survived the pressure cooker test. Cu/Si and Cu/Cr based diamond composites showed a slight change in coloration and a possible corrosion after the pressure cooker test.
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