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Impact of radiative cooling on the energy performance of courtyards in Mediterranean climate

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Building Simulation 2024年第9期17卷 1491-1513页

作者： Carlos-Antonio domínguez-Torres Antonio domínguez-Delgado Escuela Técnica Superior de Arquitectura Universidad de SevillaAv.de Reina Mercedes241012 SevillaSpain Department of Applied Mathematics 1 Escuela Técnica Superior de ArquitecturaUniversidad de SevillaAv.de Reina Mercedes241012 SevillaSpain

Radiative cooling has proven to be a useful tool to address the problems of lack of comfort and excessive energy consumption in situations of high temperatures,overheating and heat ***,incorporating courtyards in warm climate zones has been found to be highly beneficial in addressing similar ***,there is interest in analyzing the combined effects of both:radiative cooling and *** paper presents an analysis of the impact of the application of radiative cooling on a courtyard using a comprehensive simulation approach that includes a CFD model for the thermodynamic airflow in the adjacent roofs and inside the courtyard,equations for the transient heat conduction through roofs,walls and courtyard slabs,and a hybrid raytracing-radiosity model for the evaluation of the solar radiation reaching the building surfaces and its reflections,both of specular and diffuse origin,and for the calculation of the thermal radiation exchange,especially with the *** results show that in the hot season,the courtyard with radiative cooling always provides lower temperatures than the initial courtyard does,with a temperature range of 18.33℃to 33.78℃,compared to a range of 19.32℃to 38.00℃in the initial courtyard,and producing a greater difference with outdoor temperatures that can reach 12℃versus 8℃for the reference *** addition,it was found that the courtyard with radiative cooling is able to significantly reduce the observed nighttime overheating by providing lower temperatures than the outdoor temperatures in the 50%of the nights *** was also found that the thermal loads to achieve indoor thermal comfort in the spaces adjacent to the courtyard were reduced by 63.46%to 69.85%.

关键词： radiative cooling passive cooling CFD three-dimensional modeling energy saving thermal comfort

The neuroprotective effects of(S)-3,5-dihydroxyphenylglycine preconditioning in middle cerebral artery occluded rats: a perspective as a contrivance for stroke

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Neural Regeneration Research 2015年第8期10卷 1221-1222页

作者： nik Nasihah nik Ramli Rosfaiizah Siran Faculty of Medicine Universiti Teknologi MARA

Stroke is one of the fearsome causes of death that leads to high mortality and morbidity ***,the management of choice for ischemic stroke is either by thrombolysis or thrombectomy.

关键词： thrombolysis mortality morbidity challenge choice glutamate neuronal stimulation brief NMDA

On-line CO,CO_2 emissions evaluation and(benzene, toluene, xylene) determination from experimental burn of tropical biomass

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Journal of Environmental Sciences 2015年第7期27卷 239-244页

作者： Mohammed F.Tawfiq Mohamed Kheireddine Aroua nik Meriam nik Sulaiman Chemical Engineering Department Faculty of Engineering University of Malaya

Atmospheric pollution and global warming issues are increasingly becoming major environmental concerns. Fire is one of the significant sources of pollutant gases released into the atmosphere; and tropical biomass fires, which are of particular interest in this study,contribute greatly to the global budget of CO and CO2. This pioneer research simulates the natural biomass burning strategy in Malaysia using an experimental burning facility. The investigation was conducted on the emissions（CO2, CO, and Benzene, Toluene, Ethylbenzene,Xylenes（BTEX）） from ten tropical biomass species. The selected species represent the major tropical forests that are frequently subjected to dry forest fire incidents. An experimental burning facility equipped with an on-line gas analyzer was employed to determine the burning emissions. The major emission factors were found to vary among the species, and the specific results were as follows. The moisture content of a particular biomass greatly influenced its emission pattern. The smoke analysis results revealed the existence of BTEX,which were sampled from a combustion chamber by enrichment traps aided with a universal gas sampler. The BTEX were determined by organic solvent extraction followed by GC/MS quantification, the results of which suggested that the biomass burning emission factor contributed significant amounts of benzene, toluene, and m,p-xylene. The modified combustion efficiency（MCE） changed in response to changes in the sample moisture ***, this study concluded that the emission of some pollutants mainly depends on the burning phase and sample moisture content of the biomass.

关键词： Emission Biomass Experimental BTEX CO CO2 GG/MS

Deflection modification factors of multistory buildings considering soil-structure interaction

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Earthquake Engineering and Engineering Vibration 2015年第3期14卷 561-570页

作者： Farhad Abedi-nik Faramarz Khoshnoudian Department of Civil Engineering SADRA Institute of Higher Education Department of Civil Engineering Amirkabir University of Technology

In this investigation,attempts are made to examine the effects of soil-structure interaction on the deflection modification factor of multistory buildings and to clarify the role of deformable soil on this factor.A comprehensive study is conducted to investigate the effect of inertial interaction on displacement demand ratios in soil-structure systems with different structural characteristics and various non-dimensional parameters,using a simplified interacting model.A two-step regression analysis of the nonlinear,dynamic computer simulation results obtained,leads to a reliable and accurate formula for predicting deflection modification factors that incorporate foundation *** results illustrate that the application of deflection modification factors derived from fixed-base structures can lead to unsafe evaluation of the structures on soft *** proposed formula provides a useful tool for design engineers to incorporate the effect of soil-structure interaction into the evaluation of structural deformations.

关键词： defl ection modifi cation factor multistory struct

Markov Chain Modelling of Reliability Analysis and Prediction under Mixed Mode Loading

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Chinese Journal of Mechanical Engineering 2015年第2期28卷 307-314页

作者： SINGH Salvinder ABDULLAH Shahrum nik MOHAMED nik Abdullah MOHD NOORANI Mohd Salmi Department of Mechanical and Materials Engineering Faculty of Engineering & Built EnvironmentUniversiti Kebangsaan Malaysia Department of Mechanical Engineering Universiti Malaysia Pahang School of Mathematical Sciences Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia

The reliability assessment for an automobile crankshaft provides an important understanding in dealing with the design life of the component in order to eliminate or reduce the likelihood of failure and safety *** failures of the crankshafts are considered as a catastrophic failure that leads towards a severe failure of the engine block and its other connecting *** reliability of an automotive crankshaft under mixed mode loading using the Markov Chain Model is *** Markov Chain is modelled by using a two-state condition to represent the bending and torsion loads that would occur on the *** automotive crankshaft represents a good case study of a component under mixed mode loading due to the rotating bending and torsion *** estimation of the Weibull shape parameter is used to obtain the probability density function,cumulative distribution function,hazard and reliability rate functions,the bathtub curve and the mean time to *** various properties of the shape parameter is used to model the failure characteristic through the bathtub curve is ***,an understanding of the patterns posed by the hazard rate onto the component can be used to improve the design and increase the life cycle based on the reliability and dependability of the *** proposed reliability assessment provides an accurate,efficient,fast and cost effective reliability analysis in contrast to costly and lengthy experimental techniques.

关键词： reliability Weibull Markov Chain mixed mode failure

A floating point conversion algorithm for mixed precision computations

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第9期13卷 711-718页

作者： Choon Lih HOO Sallehuddin Mohamed HARIS nik Abdullah nik MOHAMED Department of Mechanical and Materials Engineering Universiti Kebangsaan MalaysiaUKM Bangi 43600Malaysia

The floating point number is the most commonly used real number representation for digital computations due to its high precision characteristics. It is used on computers and on single chip applications such as DSP chips. Double precision (64-bit) representations allow for a wider range of real numbers to be denoted. However, single precision (32-bit) operations are more efficient. Recently, there has been an increasing interest in mixed precision computations which take advantage of single precision efficiency on 64-bit numbers. This calls for the ability to interchange between the two formats. In this paper, an algorithm that converts floating point numbers from 64- to 32-bit representations is presented. The algorithm was implemented as a Verilog code and tested on field programmable gate array (FPGA) using the Quartus II DE2 board and Agilent 16821A portable logic analyzer. Results indicate that the algorithm can perform the conversion reliably and accurately within a constant execution time of 25 ns with a 20 MHz clock frequency regardless of the number being converted.

关键词： Double precision Single precision FPGA Verilog HooHar algorithm

Biosynthesized Persicaria odorata-silver nanoparticles supported zeolite Y as biocompatible antibacterial agent against Cutibacterium acnes

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Particuology 2024年第10期93卷 1-10页

作者： Muhammad Hariz Asraf nik Ahmad Nizam nik Malek Muhammad Redza Mohd Radzi Hendra Susanto Department of Biosciences Faculty of ScienceUniversiti Teknologi Malaysia81310SkudaiJohorMalaysia Centre for Sustainable Nanomaterials(CSNano) Ibnu Sina Institute for Scientific and Industrial Research(ISI-SIR)Universiti Teknologi Malaysia81310UTMJohorMalaysia Department of Biology Faculty of Mathematics and Natural SciencesUniversitas Negeri MalangIndonesia

Conventionally synthesized silver nanoparticles(AgNP)imposed an alarming effect on the environment and caused toxicity to ***,the use of zeolite(zeoY)as a support system could increase its biocompatibility and reduce its ***,green synthesis of AgNP using Persicaria odorata leaves extract supported on zeolite Y has been prepared by an in situ synthesis *** phytochemical compounds in the optimized leaf extract concentration of 1%and volume of 0.9 mL reduced the silver ions to AgNP within the zeolite Y *** observation revealed the incorporation of AgNP in the zeolite Y(average size:18.51 nm).The release of AgNP exhibited antibacterial activity on *** at a concentration lower than 1 g L^(−1) which is also dependent on the ***-zeoY promoted cell proliferation in vitro and it has a non-irritating effect when tested in the in vivo skin irritation model.

关键词： Silver nanoparticles Biosynthesis Zeolite Antibacterial Biocompatible

Materials information and mechanical response of TRIP/TWIP Ti alloys

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npj Computational Materials 2021年第1期7卷 817-825页

作者： Guohua Zhao Xiaoqing Li nik Petrinic Department of Engineering Science University of OxfordOxfordUK Department of Materials Science and Engineering KTH Royal Institute of TechnologyStockholmSweden

Materials innovation calls for an integrated framework combining physics-based modelling and data-driven informatics.A dislocation-based constitutive model accounting for both transformation-induced plasticity(TRIP)and twinning-induced plasticity(TWIP)was built to interpret the mechanical characteristics of metastable titanium *** attention was placed on quantitatively understanding the composition-sensitive phase stability and its influence on the underlying deformation *** this purpose,a pseudoelastic force balance incorporating thermodynamics and micromechanics was applied to calculate the energy landscapes ofβ→α″martensitic transformation,{332}(113)twinning and dislocation *** material data were probed,computed and fed to the *** results revealed that TRIP and TWIP may operate simultaneously because of the presence of a noticeably overlapped energy domain,and confirmed{332}(113)twinning is an energetically favourable deformation *** model validation further unveiled that the activation ofβ→α″transition remarkably enhances the strain-hardening and plasticity,even though the dynamically formedα″volume fraction is much less than that of deformation *** work suggests that the synchronised physical metallurgy and data-driven strategy allows to identify the compositional scenarios for developing high-performance engineering alloys.

关键词： deformation alloys dislocation

Dynamic necking of a near α titanium alloy at high strain rates:Experiments and modelling

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Defence Technology（防务技术） 2021年第4期17卷 1126-1134页

作者： Long-hui Zhang Antonio Pellegrino nik Petrinic Department of Engineering Science University of OxfordOxfordOX13PJUK

The tensile behaviour of near a Ti3Al2.5 V alloy,conceived for applications in aerospace and automotive engineering,is characterized from quasi-static to high strain *** material is found to present noticeable strain rate *** dynamic true strain rate in the necking cross-section reaches values up to ten times higher than the nominal strain *** is also observed that beyond necking the dynamic true stress-strain curves present limited rate *** experimental results at different strain rates are used to determine a suitable constitutive model for finite element simulations of the dynamic tensile *** model predicts the experimentally macroscopic force-time response,true stress-strain response and effective strain rate evolution with good agreement.

关键词： Nearαtitanium alloy High strain rate Locking effect Constitutive modeling Finite element simulation