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Structural performance of flexible freeform panelssubjected to wind loads

Frontiers of Structural and Civil Engineering 2024年第6期18卷 851-869页

作者： Yong YOO Zaryab shahid Renzhe CHEN maria KOLIOU Anastasia mULIANA Negar KALANTAR Zachry Department of Civil and Environmental Engineering Texas A&M UniversityCollege StationTX 77843USA J.mike Walker'66 Department of mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Architecture Division California College of the ArtsSan FranciscoCA 94107USA

An increased number of hurricanes and tornadoes have been recorded worldwide in the last decade,while research efforts to reduce wind-related damage to structures become *** architecture,which focuses on generating complex curved shapes including streamlined shapes,has recently gained *** study focuses on investigating the potential of kerf panels,which have unique flexibility depending on the cut patterns and densities,to generate complex shapes for facades and their performance under wind *** investigate the kerf panel's potential capacity against wind loads,static and dynamic analyses were conducted for two kerf panel types with different cut densities and pre-deformed *** was observed that although solid panels result in smaller displacement amplitudes,stresses,and strains in some cases,the kerf panels allow for global and local cell deformations resulting in stress reduction in various locations with the potential to reduce damage due to overstress in *** the predeformed kerf panels,it was observed that both the overall stress and strain responses in kerf cut arrangements were lower than those of the flat-shaped *** study shows the promise of the use of kerf panels in achieving both design flexibility and performance demands when exposed to service *** that this newly proposed architectural configuration(design paradigm)for facades could revolutionize structural engineering by pushing complex freeform shapes to a standard practice that intertwines aesthetic arguments,building performance requirements,and material design considerations has the potential for significant practical applications.

关键词： freeform structure kerfing method wind load analysis cladding component

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Evaluating the Impact of Different Tillage Regimes and Nitrogen Levels on Yield and Yield Components of maize (Zea mays L.)

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American Journal of Plant Sciences 2016年第6期7卷 789-797页

作者： muhammad Naeem shahid m. shahid Ibni Zamir Ihtisham-Ul Haq m. Kamran Khan mazhar Hussain Usman Afzal m. Asim Ihtisham Ali Department of Agronomy University of Agriculture Faisalabad Pakistan

A field study to evaluate the impact of different tillage regimes and nitrogen levels on yield and yield components of maize (Zea mays L.), was conducted during autumn 2014 at Students Farm, Department of Agronomy, University of Agriculture, Faisalabad. The experiment was laid out in RCBD (Randomized Complete Block Design), with split plot arrangement having three replications. The experiment was comprised of three tillage regimes (minimum, Conventional and Deep) and three nitrogen levels viz: 100, 200 and 300 kg•ha-1. Urea was used as a source of nitrogen, sulphate of potash as a source of potassium and triple super phosphate as a source of phosphorous. The amount of phosphorous and potash was constant in all the treatments i.e. 125 kg•ha-1 and 100 kg•ha-1 respectively. Results of present study are summarized as yield parameters are significantly affected by different nitrogen levels and tillage regimes. maximum number of plants at harvest (7.93), number of grain rows per cob (17.70), number of grains per row (34.31), number of grains per cob (678.58), and cob weight (187.50 g) were observed in deep tillage at 200 kg•ha-1 nitrogen application. 1000-grain weight (275.52 g), biological yield (15.66 t•ha-1), grain yield (6.16 t•ha-1) and dried stalk yield (9.91 t•ha-1) were observed maximum in deep tillage at 200 kg•ha-1 nitrogen application. Harvest index significantly affected by tillage regimes and maximum harvest index (39.58%) were recorded in deep tillage which was statistically at par with conventional tillage (38.83%). It was concluded that higher grain yield of maize can be obtained by deep tillage with the application of 200 kg•ha-1 nitrogen application under the prevailing conditions of Faisalabad.

关键词： Tillage Regimes Nitrogen Levels Deep Tillage Biological Yield Harvest Index

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The formulation and generation of a live but genetically attenuated malaria parasite vaccine

The formulation and generation of a live but genetically att...

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中国动物学会寄生虫学专业委员会第十三次全国学术会议暨第四次国际寄生虫学学术研讨会

作者： Chris J.Janse shahid m.Khan Leiden malaria Research Group LUMC

Generating sterile and long lasting protective immunity against malaria with subunit vaccines has been fraught with *** has renewed an interest in vaccinations using attenuated Plasmodium *** with irradiated sporozoit...

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An Application of Hierarchical Hybrid Control Theory to Automotive Powertrain Systems

An Application of Hierarchical Hybrid Control Theory to Auto...

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第十九届中国控制会议

作者： Peter E．Caines m．shahid Shaikh Dept. ECE McGill University MontréalQCCanada H3A 2A7 Dept. ECE McGill University MontréalQCCanada H3A 2A7

＜正＞The notion of state aggregation via the dynamical consistency relation and the resulting abstractions of dynamical systems were originally developed by Caines and Wei [9] and then extended by Lemch and Caines [12, 6, 7] to the case of hybrid systems. In this paper, the theory of hybrid systems and the theory of state aggregated hierarchical hybrid systems are used as a framework for an initial formulation of sub-optimal control strategies for automatic automotive powertrain （i.e. engine and transmission） systems under cruise control.

关键词： Hierarchical hybrid systems Automotive powertrain control Automobile cruise control Optimal control.

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Two fully automated data-driven 3D whole-breast segmentation strategies in mRI for mR-based breast density using image registration and U-Net with a focus on reproducibility

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Visual Computing for Industry,Biomedicine,and Art 2022年第1期5卷 303-314页

作者： Jia Ying Renee Cattell Tianyun Zhao Lan Lei Zhao Jiang shahid m.Hussain Yi Gao H‑H.Sherry Chow Alison T.Stopeck Patricia A.Thompson Chuan Huang Department of Biomedical Engineering Stony Brook UniversityStony BrookNY 11794USA Department of Radiation Oncology Renaissance School of MedicineStony Brook UniversityStony BrookNY 11794USA Department of medicine Northside Hospital GwinnettLawrencevilleGA 30046USA Program of Public Health Renaissance School of MedicineStony Brook UniversityStony BrookNY 11794USA Department of Radiology Renaissance School of MedicineStony Brook UniversityStony BrookNY 11794USA Department of Biomedical Informatics Renaissance School of MedicineStony Brook UniversityStony BrookNY 11794USA School of Biomedical Engineering Health Science CenterShenzhen UniversityShenzhen 518060China University of Arizona Cancer Center TucsonAZ 85719USA Department of medicine Renaissance School of MedicineStony Brook UniversityStony BrookNY 11794USA Stony Brook Cancer Center Stony Brook UniversityStony BrookNY 11794USA Department of medicine Cedar Sinai CancerCedars Sinai Medical CenterLos AngelesCA 90048USA

Presence of higher breast density(BD)and persistence over time are risk factors for breast cancer.A quantitatively accurate and highly reproducible BD measure that relies on precise and reproducible whole-breast segmentation is *** this study,we aimed to develop a highly reproducible and accurate whole-breast segmentation algorithm for the generation of reproducible BD *** datasets of volunteers from two clinical trials were *** mR images were acquired on 3T Siemens Biograph mmR,Prisma,and Skyra using 3D Cartesian six-echo GRE sequences with a fat-water separation *** whole-breast segmentation strategies,utiliz-ing image registration and 3D U-Net,were *** segmentation was performed.A task-based analysis was performed:a previously developed mR-based BD measure,magDensity,was calculated and assessed using automated and manual *** mean squared error(mSE)and intraclass correlation coefficient(ICC)between magDensity were evaluated using the manual segmentation as a *** test-retest reproducibility of magDensity derived from different breast segmentation methods was assessed using the difference between the test and retest measures(Δ_(2-1)),mSE,and *** results showed that magDensity derived by the registration and deep learning segmentation methods exhibited high concordance with manual segmentation,with ICCs of 0.986(95%CI:0.974-0.993)and 0.983(95%CI:0.961-0.992),*** test-retest analysis,magDensity derived using the regis-tration algorithm achieved the smallest mSE of 0.370 and highest ICC of 0.993(95%CI:0.982-0.997)when compared to other segmentation *** conclusion,the proposed registration and deep learning whole-breast segmentation methods are accurate and reliable for estimating *** methods outperformed a previously developed algorithm and manual segmentation in the test-retest assessment,with the registration exhibiting superior performance for highly reproducibl

关键词： Breast cancer Breast density Breast segmentation Image registration Deep learning

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Impact of metal polluted sewage water on soil nematode assemblages in agricultural settings of Aligarh,India

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Soil Ecology Letters 2024年第1期6卷 61-75页

作者： mohammed F.S.A.Ghanem shahid Afzal Humira Nesar Zarrin Imran Wasim Ahmad Nematode Biodiversity Research Lab Department of ZoologyAligarh Muslim UniversityAligarh 202002India

Sewage water in agriculture threatens human health and soil ecosystems through metal *** show promise as bioindicators of soil health due to their abundance and position in soil food ***-polluted water decreased abundance of certain nematode groups and Sigma maturity *** pollution positively affected nematode groups with r-selected life *** water has been inappropriately used in agriculture,posing possible threats to human health and the soil ecosystems by its constituent pollutants,especially heavy *** evaluation of its influences on soil biomes needs to consider the response of soil *** soil organisms,nematodes are seen as the best promising candidates for bioindicators of soil *** in,we collected soil samples from fresh water irrigated field from three sites(S1,S2 and S3)and sewage water irrigated distance gradient(5 m-40 m),to assess the influence of metal(Cu,Zn,Cd,mn,Pb)polluted water on various characteristics of nematode *** results indicated that the heavy metals decreased the abundance of C-p3 nematodes,herbivores,and predatory nematodes as well as sigma maturity index,whereas,C-p1,C-p2,bacterivore and fungivore nematodes abundance and diversity positively responded to the metal ***,nematode genera with r-selected life cycle were positively affected and those with K-selected life cycle were negatively affected by metal *** nematode community has potential to be used as indicator of pollution stress in agricultural soils to check soil health and sustainability.

关键词： heavy metals sewage irigation agriculture nematodes bioindicators

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Yield and Quality of Forage Oat (<i>Avena sativa</i>L.) Cultivars as Affected by Seed Inoculation with Nitrogenous Strains

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American Journal of Plant Sciences 2015年第19期6卷 3251-3259页

作者： muhammad Saleem m. shahid Ibni Zamir Ihtishamul Haq m. Zahid Irshad m. Kamran Khan m. Asim Qamaruz Zaman Ihtisham Ali Aman Khan Saeedur Rehman Department of Agronomy University of Agriculture Faisalabad Pakistan

Nitrogen availability can be enhanced with the application of nitrogen fixing bacteria and it may be helpful in increasing forage yield and improving quality of oat. Therefore, a field trial to evaluate the effect of seed inoculation with nitrogen fixing bacteria on forage yield and quality of oat was carried out at Agronomic Research Area, University of Agriculture, Faisalabad during Rabi season 2013-14. The experiment was laid out in Randomized Complete Block Design (RCBD) with factorial arrangements using three replications. The experiment was comprised of two integrated approaches. The first approach was oat cultivars consisting of four treatments, V1 (AVON), V2 (S-2000), V3 (S-2011) and V4 (PD2LV65) and the second approach was seed inoculation consisting of three treatments, S0 (control), S1 (Azotobacter spp.), S2 (Azospirillum spp.). Fisher’s analysis of variance technique was used for statistically interpretation of data by using least significant difference (LSD) test at 5% level of probability. Nitrogen fixing bacteria significantly affect the germination count (m2), plant height (cm), number of tillers (m2), number of leaves per tiller, leaf area per tiller (cm2), green forage yield (t·ha-1) and dry matter yield (t ha-1). The maximum green forage yield (85.2 t·ha-1), dry matter yield (14.1 t ·ha-1) and crude protein (11.5%) were recorded where Azotobacter inoculation was applied. The interaction between cultivars and nitrogenous strains was significant for green forage yield (t·ha-1), dry matter yield (t·ha-1) and crude protein (%). Conclusion showed that cultivar Sargodha-2011 which was inoculated with Azotobacter spp. gave higher forage yield of good quality.

关键词： Oat Cultivars Nitrogenous Strains Quality and Forage Yield

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m_(4)X_(3) mXenes:Application in Energy Storage Devices

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Nano-micro Letters 2024年第10期16卷 522-542页

作者： Iftikhar Hussain Waqas Ul Arifeen shahid Ali Khan Sikandar Aftab muhammad Sufyan Javed Sajjad Hussain muhammad Ahmad Xi Chen Jiyun Zhao PRosaiah Khaled Fahmi Fawy Adnan Younis Sumanta Sahoo Kaili Zhang Department of mechanical Engineering City University of Hong Kong83 Tat Chee AvenueKowloon TongHong KongPeople's Republic of China School of mechanical Engineering Yeungnam UniversityDaehak-roGyeongsan-siGyeongbuk-do 38541South Korea Department of Semiconductor Systems Engineering and Clean Energy Sejong UniversitySeoul 05006Republic of Korea School of Physical Science and Technology Lanzhou UniversityLanzhou 730000People's Republic of China Department of Nanotechnology and Advanced materials Engineering Sejong UniversitySeoul 05006Republic of Korea Department of Physics Saveetha School of EngineeringSaveetha Institute of Medical and Technical Sciences(SIMATS)ThandalamChennai 602105India Department of Chemistry Faculty of ScienceKing Khalid UniversityP.O.Box 900461413 AbhaSaudi Arabia Department of Physics College of ScienceUnited Arab Emirates UniversityP.O.Box 15551Al-AinUnited Arab Emirates School of Chemical Engineering Yeungnam UniversityGyeongsanGyeongbuk 38541South Korea

mXene has garnered widespread recognition in the scientific com-munity due to its remarkable properties,including excellent thermal stability,high conductivity,good hydrophilicity and dispersibility,easy processability,tunable surface properties,and admirable *** have been categorized into different families based on the number of m and X layers in m_(n+1)X_(n),such as m_(2)X,m_(3)X_(2),m_(4)X_(3),and,recently,m_(5)X_(4).Among these families,m_(2)X and m_(3)X_(2),par-ticularly Ti_(3)C_(2),have been greatly explored while limited studies have been given to m_(5)X_(4)mXene ***,studies on the m_(4)X_(3)mXene family have developed recently,hence,demanding a compilation of evaluated ***,this review provides a systematic overview of the latest advancements in m_(4)X_(3)mXenes,focusing on their properties and applications in energy storage *** objective of this review is to provide guidance to researchers on fostering m_(4)X_(3)mXene-based nanomaterials,not only for energy storage devices but also for broader applications.

关键词： mXene m_(4)X_(3)mXenes 2D materials Energy storage Properties

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基于SmX静态混合器的天然气掺氢流动影响研究

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石油化工设备 2024年第2期53卷 1-9页

作者：刘永振陈天昊赵序海 Ihsan shahid Anas 肖秋红马凡华清华大学车辆与运载学院北京100084 中国地质大学(武汉)珠宝学院湖北武汉430074

为了获取均匀的天然气掺氢混合气,确保掺氢燃气管道稳定、安全输送,采用数值模拟与试验相结合的方法研究了天然气与氢气在SmX静态混合器中的掺混特性及影响因素,详细分析了掺混单元数量、运行工况和掺氢体积比等因素对掺混性能的影响。... 详细信息

为了获取均匀的天然气掺氢混合气,确保掺氢燃气管道稳定、安全输送,采用数值模拟与试验相结合的方法研究了天然气与氢气在SmX静态混合器中的掺混特性及影响因素,详细分析了掺混单元数量、运行工况和掺氢体积比等因素对掺混性能的影响。研究结果表明,氢气与天然气的混合主要依赖于混合单元不断改变流动状态,实现左旋和右旋相互交替,达到均匀混合。流动损失主要取决于静态混合器内流动速度,综合考虑SmX静态混合器的压力损失和混合均匀度性能指标,采用4个掺混单元、进口气流速度10 m/s是一个优选方案。此外,增大掺氢体积比和加长流经混合器出口下游管道长度均有利于提升氢气和天然气掺混均匀度,要结合燃气管道的具体情况来确定掺氢体积比的合理范围。

关键词：静态混合器天然气氢气掺混单元混合均匀度流动损失掺氢体积比

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Frequency-dependent viscoelasticity effects on the wave attenuation performance of multi-layered periodic foundations

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Applied mathematics and mechanics(English Edition) 2024年第3期45卷 407-424页

作者： m.SAFI m.VAKILIFARD m.J.mAHmOODI Faculty of Civil Water&Environmental EngineeringShahid Beheshti UniversityTehran ***Iran Faculty of mechanical and Energy Engineering Shahid Beheshti UniversityTehran ***Iran

In this paper,layered periodic foundations(LPFs)are numerically examined for their responses to longitudinal and transverse modes in the time and frequency *** different unit-cells,i.e.,2-layer,4-layer,and 6-layer unit-cells,comprising concrete/rubber,concrete/rubber/steel/rubber,and concrete/rubber/steel/rubber/lead/rubber materials,respectively,are taken into ***,the viscoelasticity behavior of the rubber is modeled with two factors,i.e.,a frequency-independent(FI)loss factor and a linear frequency-dependent(FD)loss *** the extraction of the complex dispersion curves and the identification of the band gaps(BGs),the simulations of wave transmission in the time and frequency domains are performed using the COmSOL *** parametric studies evaluate the effects of the rubber viscoelasticity models on the dispersion curves and the wave transmission for the longitudinal and transverse *** results show that considering the rubber viscoelasticity enhances the wave attenuation ***,the transverse-mode damping is more sensitive to the viscoelasticity model than its longitudinal *** 6-layer unit-cell LPF exhibits the lowest BG,ranging from 4.8 Hz to 6.5 Hz.

关键词： layered metamaterial periodic foundation complex dispersion curve wave transmission diagram

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