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Nine Students Die As Bonfire Collapses in Texas

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当代外语研究 1999年第12期 16-18页

作者： adrees latif 杨琼

天有不测风云,人有旦夕祸福！本文主题句囊括了悲剧内客:美国得克萨斯州的A＆.M University正在搭建中的一座准备用于感恩节篝火晚会的大型金字塔形建筑突然倒塌,造成9名大学生死亡,另有28人受伤。这座木制结构的建筑在当地时间凌晨2... 详细信息

天有不测风云,人有旦夕祸福！本文主题句囊括了悲剧内客:美国得克萨斯州的A＆.M University正在搭建中的一座准备用于感恩节篝火晚会的大型金字塔形建筑突然倒塌,造成9名大学生死亡,另有28人受伤。这座木制结构的建筑在当地时间凌晨2时30分许突然倒塌,当时正在参加搭建工作的六七十名学生被压在了下面,营救人员赶到后,动用了吊车和声音探测器等工具展开营救工作,先后发现9具尸体,并营救出28名受伤人员,其中一些人员伤势较重。本文文字朴素,行文流畅,提供了许多感人的细节,同时还对此项活动的历史背景作了回顾。

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Enhanced composite thermal conductivity by percolated networks of in-situ confined-grown carbon nanotubes

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Nano Research 2023年第11期16卷 12821-12829页

作者： Xiao Zhang Wei Tan Tian Carey Bo Wen Delong He adrees Arbab Alex Groombridge Fiona Smail Jean de La Verpilliere Chengning Yao Yanchun Wang Xiaojun Wei Huaping Liu Sishen Xie Felice Torrisi Michael De Volder Weiya Zhou Adam Boies Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China Department of Engineering University of CambridgeCambridge CB21PZUK Cambridge Graphene Centre Engineering DepartmentUniversity of CambridgeCambridge CB30FAUK UniversitéParis-Saclay Centrale-SupélecENS Paris-SaclayCNRSLMPS-Laboratoire de Mécanique Paris-Saclay91190Gif-sur-YvetteFrance Echion Technologies Cambridge CB223FGUK Molecular Sciences Research Hub Imperial College LondonLondon W120BZUK Dipartimento di Fisica e Astronomia Universita'di CataniaCatania 6495123Italy School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK School of Physics CRANN&AMBER Research CentresTrinity College DublinDublin D02 E8C0Ireland Jaguar Land Rover Banbury Road GaydonLighthorne HeathWarwick CV350RRUK

Despite the ever-increasing demand of nanofillers for thermal enhancement of polymer composites with higher thermal conductivity and irregular geometry,nanomaterials like carbon nanotubes(CNTs)have been constrained by the nonuniform dispersion and difficulty in constructing effective three-dimensional(3D)conduction network with low loading and desired isotropic or anisotropic(specific preferred heat conduction)***,we illustrated the in-situ construction of CNT based 3D heat conduction networks with different directional ***,to in-situ construct an isotropic percolated conduction network,with spherical cores as support materials,we developed a confined-growth technique for CNT-core sea urchin(CNTSU)*** 21.0 wt.%CNTSU loading,the thermal conductivity of composites reached 1.43±0.13 W/(m·K).Secondly,with aligned hexagonal boron nitride(hBN)as an anisotropic support,we constructed CNT-hBN aligned networks by in-situ CNT growth,which improved the utilization efficiency of high density hBN and reduced the thermal interface resistance between matrix and ***~8.5 wt.%loading,the composites possess thermal conductivity up to 0.86±0.14 W/(m·K),374%of that for neat *** to the uniformity of CNTs in hBN network,the synergistic thermal enhancement from one-dimensional(1D)+two-dimensional(2D)hybrid materials becomes more *** on the detailed experimental evidence,the importance of purposeful production of a uniformly interconnected heat conduction 3D network with desired directional performance can be observed,particularly compared with the traditional direct-mixing *** study opens new possibilities for the preparation of high-power-density electronics packaging and interfacial materials when both directional thermal performance and complex composite geometry are simultaneously required.

关键词： carbon nanotubes hexagonal boron nitride thermal conductivity composites three-dimensional printing

Riverine Flood Damage Assessment of Cultivated Lands along Chenab River Using GIS and Remotely Sensed Data: A Case Study of District Hafizabad, Punjab, Pakistan

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Journal of Geographic Information System 2015年第5期7卷 506-526页

作者： Khurram Chohan Sajid Rashid Ahmad Zia ul Islam Muhammad adrees The Institute of Geology University of the Punjab Lahore Pakistan The Urban Unit Urban Sector Planning and Management Services Unit (Pvt.) Ltd. Lahore Pakistan

Flood is one of a kind of disasters which harms human and animal life around the globe. Pakistan has been observing massive floods for many years because of daily and seasonal variation in the temperature levels. Wheat, rice, sugarcane and cotton are major crops cultivated in Punjab region of Pakistan in which rice and sugarcane are mostly effected by floods. In this research paper, damage assessment of cultivated land in district Hafizabad along Chenab River has been calculated. Supervised Classification and Soil Adjusted Vegetation Index (SAVI) methods are applied. Pre-flood 2014, post-flood 2014, and pre-flood 2015 Landsat 8 images have been used to calculate the extent of damages to cultivated lands. Water, sand, silt, bare soil and vegetation are classified to identify damage. Results show that vegetation cover has plummeted to 50% after the arrival of flood 2014 in the Chenab. Similarly, 6.7047% of sand and 15.7339% of bare soil deposits have surfaced which have not yet been removed from fertile lands in 2015. 18.4376% standing crop damage has been analyzed under this study. 14.0245% silt deposits have been calculated as post-flood effects. 46.4260% land has been cultivated in 2015 which is 15.5024% lower than 2014 cultivated land. Furthermore, field verification survey has given promising results and has a great correlation with satellite based recovery results.

关键词： Flood SAVI Supervised Classification GIS Remote Sensing Damage Assessment Sand

Spatiotemporal Analysis of Urban Sprawl and Its Contributions to Climate and Environment of Peshawar Using Remote Sensing and GIS Techniques

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Journal of Geographic Information System 2016年第2期8卷 137-148页

作者： Rashid Mehmood Syed Amer Mehmood Muhammad Atif Butt Imtiyaz Younas Muhammad adrees Department of Space Sciences University of the Punjab Lahore Pakistan Punjab University College of Information Technology University of the Punjab Lahore Pakistan

This research study predominantly emphases on spatiotemporal extensions of urban area of Peshawar;its adverse impacts and contributions to climate and environment during 1931 to 2011. To probe these interventions, meteorological data, Satellite’s temporal imagery of Landsat ETM+ and TM, anthropogenic and demographic secondary data were congregated. In relation to map out land cover changes, maximum likelihood classification algorithm and followed by change detection techniques were applied to study area. The outcome of this process was further subjected through Geographic Information System (GIS) overlay analysis which suggested a clear straggle in urban area. Auxiliary data (Population growth rate, transportation, electricity connections, etc.) also support the fact of urban area extension. This study proposes that severs contributions of massive heat energy and CO2 have been added to local climate and environment ensuing substantial increment in temperature drawn out from the trends. Consequently, Remote Sensing, GIS and allied data were found to be effective to gauge such variations. To eliminate anomalies in sprawl and environment, few suggestions and recommendation are made in latter part of this study.

关键词： Remote Sensing Geographic Information System (GIS) Landsat Anthropogenic Data Climate Change Detection Techniques