287 research outputs found
PURE ROTATIONAL SPECTRA OF RARE GAS- COMPLEXES
No full textY. Ohshima, Y. Sumiyoshi, and Y. Endo, 51st International Symposium on Molecular Spectroscopy, Paper WF05 (1996). A. Nowek and J. Leszczynski, {J. Chem. Phys}., \textbf{105}, 6388 (1996).Author Institution: Dept. of Pure and Applied Sciences, The University of Tokyo; Dept. of Chemistry, Kyoto UniversityIn addition to the rotational spectrum of Ar- reported , that of Kr- was observed for the first time by using a PDN-FTMW spectroscopy. The complex was produced in a supersonic jet by discharging a mixture containing , CO, and Kr diluted in Ar. Rotational transitions of mono-substituted species on Kr, H, C, and O were also observed, yielding a precise substitution structure of the complex, where however a large amplitude bending motion of the complex had to be considered. The determined Rg-H distances were explained for species by considering a charge induced dipole-charge interaction. Furthermore, for Ar-, the Ar-H distance and the vibrational frequencies of the van der Waals modes, which were extimated by the centrifugal distortion constant and an analysis of the large amplitude bending motion, were in good agreement with a recent {ab initio}
INTERMOLECULAR POTENTIAL ENERGY SURFACES FOR THE Rg-SH COMPLEXES (Rg:Ne,Kr) STUDIED BY FTMW SPECTROSCOPY
No full text Y. Sumiyoshi, Y.Ohshima, and Y. Endo, J. Chem. Phys. 113, 10121 (2000).Author Institution: Department of Basic Science, Graduate School of Arts and Sciences, The University of TokyoRare gas-SH complexes are interesting species because various phenomena caused by the unquenched spin and angular momenta exist. In the present study, we have observed pure rotational spectra of Ne.SH and Kr-SH in the ground state by FTMW spectroscopy. R-branch transitions in the lower spin component for the linear radical were observed for in the GHz region for Ne-SH, and for in the GHz region for Kr-SH, respectively. In these spectra P-type doublings and hyperfine splittings associated with the H nuclei have been observed. Although the spectral pattern of Kr-SH is relatively regular, that of Ne-SH is fairly irregular with the J dependence of the P-type doubling very different from other Rg-SH or Rg-OH species. In the present analysis, we used a program system explicitly taking into account of the large amplitude stretching and bending motions coupled with the fine and hyperfine structure. We were able to determine intermolecular potential energy surfaces(IPS) for both of the species. We have obtained systematic information on the intermolecular interaction, and compared it with that of . The average potential turned out to be fairly shallow and isotropic, especially for Ne.SH, and this may be the source of the irregular spectral pattern of Ne.SH
Evaluation of Basement's Thermal Performance Against Thermal Comfort Model at Hot-arid Climates, Case Study (Egypt)
No full textReaching thermal comfort levels in hot-arid climates is becoming more difficult nowadays without the use of high energy consuming mechanical systems. Therefore, the need to use effective passive energy design techniques such as earth-sheltered buildings is becoming greater.
This paper combines researches that uses monitoring and simulations in order to evaluate basements’ thermal performance that reached thermal comfort levels without active air-conditioning systems, despite the harsh climate conditions. The case study was conducted in Al-Minya city, Egypt, which is known for its high diurnal range. The study calibrated a non-conditioned basement simulation model versus the monitored data to simulate its thermal performance. The greatest challenge was to calculate the ground temperature. To do this successfully, we used an iterative approach between packages of the basement preprocessor and Energy Plus / Design Builder until reaching a convergence.
The iterative method results showed significant agreement between the measured and modeled data; with a correlation of 98 percent and errors with mean bias error and normalized root mean square error of -1.0 and 7.6 percent; respectively. On the other hand, the Energy Plus method, integrating the Xing approach, showed significantly divergent results between the simulated models versus the measured data. The calibrated model analysis evaluation, using the Fanger’s thermal comfort model, showed satisfactory results within the thermal comfort sensation range.
The research results significance indicates that the precise customized detailed iterative method is essential to create the needed inputs which subsequently lead to near-to-actual outputs compared with other ground-contact simulation methods. In fact, the precise customized detailed iterative method approach may be used as a benchmark for simulators for easy and precise ground temperatures’ calculations and earth-sheltered buildings’ simulations
Simulating air-conditioning use in Office Buildings by Modeling the Relationship between Psychological Factors and Occupants’ Behavior in Japan
No full textThis study explores the relationship between occupants’ awareness, behavior, and environmental factors in office air conditioning systems. It aims to create an analytical tool for understanding air conditioning usage in Japanese offices. Using the Theory of Planned Behavior and the DNAs framework, the research establishes a model linking occupants’ environmental awareness, age, and thermal preferences to their air conditioning behavior. Using agent-based modeling, key factors influencing air conditioning usage, including the impact of environmental awareness on air conditioning behavior were simulated. The results indicate that office occupancy rates and initial temperature settings significantly impact usage patterns. In conclusion, this study offers insights for improving energy efficiency in office air conditioning while maintaining occupant comfort. This study still has some limitations that real-world office buildings are more intricate than the model used, with factors like interpersonal influence and diverse job types impacting air conditioning usage differently. Future research aims to validate findings in actual office settings, collect additional data on usage factors, and expand simulations to explore energy-saving methods and occupant comfort enhancement beyond air conditioning behavior
Cognitive Enhancement in Psychiatric Disorders
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
Evaluation of Basement's Thermal Performance Against Thermal Comfort Model at Hot-arid Climates, Case Study (Egypt)
No full textReaching thermal comfort levels in hot-arid climates is becoming more difficult nowadays without the use of high energy consuming mechanical systems. Therefore, the need to use effective passive energy design techniques, such as earth-sheltered buildings, is becoming greater.This paper describes research, that uses monitoring and simulations, to evaluate basements’ thermal performance, which reached thermal comfort levels without active air-conditioning systems, despite the harsh climate conditions. The case study was conducted in Al Minya city, Egypt, which is known for its high diurnal range. The study calibrated a non-conditioned basement simulation model versus the monitored data to simulate its thermal performance. The greatest challenge was to calculate the ground temperature. To do this successfully, we used an iterative approach between packages of the Basement preprocessor and EnergyPlus/Designbuilder until reaching a convergence.The iterative method results showed significant agreement, between the measured and modeled data, with a correlation of 98 percent, and errors with mean bias error and normalized root mean square error of -1.0 and 7.6 percent, respectively. On the other hand, the EnergyPlus method, integrating the Xing approach, showed significantly divergent results between the simulated models versus the measured data. The calibrated model analysis evaluation, using the Fanger’s thermal comfort model, showed satisfactory results within the thermal comfort sensation range.The research results significance indicates that the precise customized detailed iterative method is essential to create the needed inputs which subsequently lead to near-to-actual outputs compared with other ground-contact simulation methods. In fact, the precise customized detailed iterative method approach may be used as a benchmark for simulators for easy and precise ground temperatures’ calculations and earth-sheltered buildings’ simulations.</jats:p
Design procedure for dual air handling unit of air-conditioning system
No full textThe use of conventional air-conditioning system in tropical climate is ineffective to reduce the humidity. In a typical application, the indoor temperature has to be overcooled to decrease the humidity which has an inherent effect of high energy consumption. The introduction of dual air handling unit (AHU) is the answer to high humidity environment. Each AHU is tasked to control the parameter of temperature and humidity respectively according to the desired value. In this paper, the objective is to design the procedure of sizing the dual AHU so that the control system could run efficiently. Basically, eight (8) steps are necessary to size the dual AHU system and the procedure requires sequential manner. Namely, the design process are indoor design condition, fresh air flow, outdoor design condition, room cooling load, capacity of both AHUs, supply air temperature of second AHU, supply air temperature of first AHU and the enthalpy of both AHUs. The design procedure also requires a psychrometric chart to indicate the air thermal condition throughout the cycle of the air-conditioning system. In conclusion, the proposed design procedure is simple yet effective for the application of dual AHU system to handle the excessive latent heat environment
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