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Physics-based,data-driven approach for predicting natural ventilation of residential high-rise buildings

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Building Simulation 2022年第1期15卷 129-148页

作者： Vincent J.l.Gan Boyu Wang C.M.Chan A.u.Weerasuriya Jack C.P.Cheng Department of Building School of Design and EnvironmentNational University of SingaporeSingapore117566 Department of Civil and Environmental Engineering The Hong Kong University of Science and TechnologyHong Kong999077China

Natural ventilation is particularly important for residential high-rise buildings as it maintains indoor human comfort without incurring the energy demands that air-conditioning *** improve a building’s natural ventilation,it is essential to develop models to understand the relationship between wind flow characteristics and the building's *** more effort is still needed for developing such reliable,accurate,and computationally economical models instead of currently the most popular physics-based models such as computational fluid dynamics(CFD)*** paper,therefore,presents a novel model developed based on physics-based modelling and a data-driven approach to evaluate natural ventilation in residential high-rise *** model first uses CFD to simulate wind pressures on the exterior surfaces of a high-rise *** the surface pressures have been obtained,multizone modelling is used to predict the air change per hour(ACH)for different flats in various ***-driven prediction models are then developed using data from the simulation and deep neural networks that are based on mean absolute error,mean absolute percentage error,and a fusion algorithm *** data-driven models are used to predict the ACH of 25 *** results from multizone modelling and data-driven modelling are *** results imply a high accuracy of the data-driven prediction in comparison with physics-based *** fusion algorithm-based neural network performs best,achieving 96%accuracy,which is the highest of all models *** study contributes a more efficient and robust method for predicting wind-induced natural *** findings describe the relationship between building design(e.g.,plan layout),distribution of surface pressure,and the resulting ACH,which serve to improve the practical design of sustainable buildings.

关键词： computational fluid dynamics data-driven prediction machine learning multizone model natural ventilation residential building

A Statistical Mechanical Analysis on the Bound State Solution of an Energy-Dependent Deformed Hulthén Potential Energy

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Communications in Theoretical Physics 2019年第9期71卷 1127-1138页

作者： B.C.lütfüoglu A.N.Ikot u.S.Okorie A.T.Ngiangia Department of Physics Faculty of ScienceAkdeniz University07058AntalyaTurkey Department of Physics Faculty of ScienceUniversity of Hradec KraloveRokitanskeho6250003Hradec KraloveCzechia Department of Physics Theoretical Physics GroupUniversity of Port HarcourtChobaPort HarcourtNigeria Department of Physics Akwa Ibom State UniversityIkot AkpadenP.M.B.1167UyoNigeria

In this article, we investigate the bound state solution of the Klein Gordon equation under mixed vector and scalar coupling of an energy-dependent deformed Hulthén potential in D dimensions. We obtain a transcendental equation after we impose the boundary conditions. We calculate energy spectra in four different limits and in arbitrary dimension via the Newton-Raphson method. Then, we use a statistical method, namely canonical partition function, and discuss the thermodynamic properties of the system in a comprehensive way. We find out that some of the thermodynamic properties overlap with each other, some of them do not.

关键词： Klein-Gordon equation energy-dependent deformed Hulthén potential energy bound state solution thermodynamic properties

Chronic constipation in hemiplegic patients

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World Journal of Gastroenterology 2007年第29期13卷 3967-3972页

作者： F Bracci D Badiali P Pezzotti G Scivoletto u Fuoco l Di lucente A Petrelli E Corazziari Department of Clinical Sciences La Sapienza University Rome Italy ISS Ministry of Health Rome Italy IRCCS Foundation Santa lucia Rome Italy

AIM: To assess the prevalence of bowel dysfunction in hemiplegic patients, and its relationship with the site of neurological lesion, physical immobilization and pharmacotherapy. METHODS: Ninety consecutive hemiplegic patients and 81 consecutive orthopedic patients were investigated during physical motor rehabilitation in the same period, in the same center and on the same diet. All subjects were interviewed ≥ 3 mo after injury using a questionnaire inquiring about bowel habits before injury and at the time of the interview. Patients’ mobility was evaluated by the Adapted Patient Evaluation Conference System. Drugs considered for the analysis were nitrates, angiogenic converting enzyme (ACE) inhibitors, calcium antagonists, anticoagulants, antithrombotics, antidepressants, anti-epileptics. RESulTS: Mobility scores were similar in the two groups. De novo constipation (OR = 5.36) was a frequent outcome of the neurological accident. Hemiplegics showed an increased risk of straining at stool (OR: 4.33), reduced call to evacuate (OR: 4.13), sensation of incomplete evacuation (OR: 3.69), use of laxatives (OR: 3.75). logistic regression model showed that constipation was significantly and independently associated with hemiplegia. A positive association was found between constipation and use of nitrates and antithrombotics in both groups. Constipation was not related to the site of brain injury. CONCluSION: Chronic constipation is a possible outcome of cerebrovascular accidents occurring in 30% of neurologically stabilized hemiplegic patients. Its onset after a cerebrovascular accident appears to be independent from the injured brain hemisphere, and unrelated to physical inactivity. Pharmacological treatment with nitrates and antithrombotics may represent an independent risk factor for developing chronic constipation.

关键词： Constipation Disphagia Stroke Pharmacotherapy

Calculation of stratosphere–troposphere exchange in East Asia cut-off lows:cases from the lagrangian perspective

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Atmospheric and Oceanic Science letters 2016年第1期9卷 31-37页

作者： Wu Xue lü Da-Ren Key laboratory for Atmosphere and Global environment Observation Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

In this study,the authors focus on the cut-off low pressure systems（COls）lingering over East Asia in late spring and early summer and quantify the two-way stratosphere–troposphere exchange（STE）by 3D trajectory integrations,achieved using a revised version of the uK universities Global Atmospheric Modelling Programme Offline Trajectory Code（Version 3）.By selecting 10 typical COls and calculating the cross-tropopause air mass fluxes,it is found that stratosphere-to-troposphere transport（STT）fluxes exist in the center of COls;and in the periphery of the COl center,troposphereto-stratosphere transport（TST）fluxes and STT fluxes are distributed *** transport fluxes in COls are from stratosphere to troposphere,and the magnitude is about 10-4 kg m-2 *** ratio between the area-averaged STT and TST fluxes increases with increasing strength of the *** adopting appropriate residence time,the spurious transports are effectively ***,the authors compare the results with previous studies,and find that the cross-tropopause fluxes（CTFs）induced by COls are about one to two orders of magnitude larger than global *** play a significant role in local,rapid air mass exchanges,although they may only be responsible for a fraction of the total STE.

关键词： stratosphere–troposphere exchange cut-off low trajectory model

Risk of New-Onset Atrial Fibrillation in Elderly Patients with the Overlap Syndrome: A Retrospective Cohort Study

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Journal of Geriatric Cardiology 2013年第2期10卷 129-134页

作者： Harsha V. Ganga Sanjeev u. Nair Venkata K. Puppala Wayne l. Miller The Henry low Heart Center Hartford Hospital B-1010 80 Seymour Street Hartford CT 06102 USA St. Joseph's Hospital 45 W 10th St St. Paul MN 55102 USA Division of Cardiovascular Diseases Mayo Clinic Rochester MN 55905 USA

Background Co-existence of obstructive sleep apnea (OSA) and chronic obstructive pulmonary disease (COPD) is referred to as overlap syndrome. Overlap patients have greater degree of hypoxia and pulmonary hypertension than patients with OSA or COPD alone. Studies showed that elderly patients with OSA alone do not have increased risk of atrial fibrillation (AF) but it is not known if overlap patients have higher risk of AF. Objective To determine whether elderly patients with overlap syndrome have an increased risk of AF. Methods In this single center, community-based retrospective cohort analysis, data were collected on 2,873 patients > 65 years of age without AF, presenting in the year 2006. Patients were divided into OSA group (n = 60), COPD group (n = 416), overlap syndrome group (n = 28) and group with no OSA or COPD(n = 2369). The primary endpoint was incidence of new-onset AF over the following two years. logistic regression was performed to adjust for heart failure (HF), coronary artery disease, hypertension (HTN), cerebrovascular disease, cardiac valve disorders, diabetes mellitus, hyperlipidemia, chronic kidney disease (CKD) and obesity. Results The incidence of AF was 10% in COPD group, 6% in OSA group and 21% in overlap syndrome group (P usting for age, sex, HF, CKD, and HTN, patientswith overlap syndrome demonstrated a significant association with new-onset AF (OR = 3.66, P = 0.007). HF, CKD and HTNwere also significantly associated with new-onset AF (P lusion Among elderly patients, the presence of overlap syndrome is associatedwith a marked increase in risk of new-onset AF as compared to the presence of OSA or COPDalone.

关键词： Atrial arrhythmias Elderly patients Obstructive lung disease Sleep apnea

To treat or not to treat Alzheimer’s disease by the ketogenic diet? That is the question

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Neural Regeneration Research 2020年第5期15卷 857-858页

作者： Marzena ulamek-Koziol Ryszard Pluta laboratory of Ischemic and Neurodegenerative Brain Research Mossakowski Medical Research CentrePolish Academy of SciencesWarsawPoland First Department of Neurology Institute of Psychiatry and NeurologyWarsawPoland

Alzheimer’s disease (AD) and current treatments: AD is a serious neurological disorder worldwide that affects about 26 million people,and whose prevalence has been calculated to quadruple by 2050,thus reaching over 1% of the total population,with the highest prevalence occurring in both adults and elderly (Pluta et al.,2018).Neurodegenerative processes of the sporadic form of AD probably start 20 years before the clinical onset of the disorder (Pluta et al.,2018).This disease is the most important cause of dementia in world aged society (~75%).AD is a disorder that affects not only patients but also their *** social and economic burden associated with AD was calculated as an example in the united States alone;600 billion dollars annually is spent on caring for AD patients (Pluta et al.,2018).AD is the one of the great health-care challenges of the 21st *** incidence of AD,a chronic and progressive neurodegenerative disorder,is increasing,as well as the need for efficient methods of diagnosis,prevention and treatment (Pluta et al.,2018).The characteristic clinical and neuropathological hallmarks of AD are: dementia as the main clinical symptom and in post-mortem neuropathological examination,the presence of amyloid plaques as well as neurofibrillary tangles and loss of neurons in the brain of AD *** role of amyloid and tau protein is questioned in the etiology of AD and other causes such as ischemic etiology are being considered (Pluta and u?amek-Kozio?,2019).There are several treatments that are not causal but symptomatic that are not effective,especially for advanced *** date,only a few drugs are approved,such as acetylcholinesterase inhibitors and *** that regulate partly the activity of neurotransmitters and partly alleviate behavioral *** treatment options include active and passive immunization,anti-aggregation specifics,and secretase *** road to clarity AD etiology,early final ante mortem dia

关键词： diagnosis Alzheimer prevention protein vitamin or cause has

Hybrid uncertainties-based analysis and optimization design of powertrain mounting systems

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Science China(Technological Sciences) 2020年第5期63卷 838-850页

作者： CAI BoHao SHANGGuAN Wen-Bin lÜHui BO Tao School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510641China

In this study,a hybrid uncertainties-based analysis and optimization method is presented for the designs of the powertrain mounting system(PMS)involving mixed *** the presented method,the PMS parameters with sufficient data are treated as random variables,while those with limited information are defined as interval ***,an uncertainty-based analysis method called as hybrid interval-random perturbation-central difference method(HIRP-CDM),is proposed to compute the hybrid interval-random outputs of the inherent characteristics of the PMS in concerned *** addition,the hybrid interval-random-Monte Carlo method(HIR-MCM)is developed to verify the computational accuracy of ***,an optimization model mixed uncertainties is built up for the PMS design based on HIRP-CDM,in which the hybrid intervalrandom outputs of the concerned inherent characteristics are adopted to construct the design objective and *** complex optimization problem can be effectively settled by means of *** effectiveness of the presented method is verified by a numerical example.

关键词： powertrain mounting system hybrid uncertainties uncertainty analysis optimization design

INVESTIGATION OF THE EFFECT OF TEMPERATuRES ONTENSIlE lOAD DROPS OF TITANIuM AllOY

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Acta Metallurgica Sinica(English letters) 1997年第3期10卷 198-202页

作者： Z zhang zh Tu l.F. li l.Z. zhaoand D. Jin (Cryogenic laboratory Chinese Acaderw of Sciences, Beijing 100080, China )H.J lu (Beijing Institute of Aerospace Materials and Technology, Beijing 100076, China) Cryogenic lab Chinese Acad of Sciences Beijing China

low temperature may greatly affect the mechanical properties of materials. Some in-teresting mechanical phenomena were detected at very low temperature. In this study,a multi-sample tensile installation was designed to study the plastic deformation be-havior for Ti-5Al-2.5Sn extra-low-interstitial (ElI) alloy at liquid helium *** special geometrical instability phenomena in low temperature, serrated deforma-tion and multi necking, was studied in detail in this project. Slip and twinning were determined in the process of plastic fiow by SEM/TEM analysis. Efficts of temper-ature and sequential straining on load drops in tensile stress-strain curves were also studied. Optical measurement method was used to gauge the geometrical characteristic of multi-necking specimens. The sensitivity of partial thermoplastic deformation and the equivalency of low tempemture with high velocity of this material were studied by using micro-mechanics *** criterion of geometrical instability has been discussed. A computer simulation of the low temperature instability of plastic fiow in Ti-5Al-2.5Sn ElI alloy has been carried out. A computer model has been established which links the hot dtffusion and the plastic fiow of hcp alloys under assumption that the tempemture is homogeneous within the specimen and that the heat exchange with the thermal bath is the control-ling step in the heat release. The computer simulation of the deformation curves as a function of several mechanincal, geometrical and thermal parameters provides a re-alistic description of the experiments. The experimental data available are discnssed in the light of the computer simulation model.

关键词： mechanical property plastic deformation computer simulation

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桩的模糊随机可靠性分析

岩土力学 2008年第7期29卷 1993-1996页

作者：吕玺琳吕龙吕恩琳同济大学地下建筑与工程系上海200092 西南交通大学峨嵋校区土木工程系四川峨嵋山614202 重庆大学工程力学系重庆400030

利用一次二阶矩法,考虑可靠性分析模型中随机参数的模糊性,建立了模糊随机可靠性分析模型。利用分解定理,取一系列λ截集,将模糊数转换为一系列区间数进行运算,得到了一种模糊随机可靠度的计算方法。将该法应用到桩的可靠性分析中,实例... 详细信息

利用一次二阶矩法,考虑可靠性分析模型中随机参数的模糊性,建立了模糊随机可靠性分析模型。利用分解定理,取一系列λ截集,将模糊数转换为一系列区间数进行运算,得到了一种模糊随机可靠度的计算方法。将该法应用到桩的可靠性分析中,实例表明,该方法是合理实用的。

关键词：一次二阶矩法模糊随机可靠度 λ截集区间数桩