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具临界位势和权函数的非线性双调和问题(英文)

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应用数学 2013年第2期26卷 431-437页

作者： A. A. Abdelgadir 李用声王友军华南理工大学数学系广东广州510640 青尼罗河大学工学院数学系

本文考虑具有临界位势和临界权函数的四维非线性重调和问题,证明非平凡解的存在性.

关键词：双调和问题临界位势非平凡解

Towards electric digital twin grid: Technology and framework review

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能源与人工智能(英文) 2023年第1期11卷 179-195页

作者： Md.Mhamud Hussen Sifat Safwat Mukarrama Choudhury Sajal K.Das Md.Hafiz ahamed S.M.Muyeen Md.Mehedi Hasan Md.Firoj Ali Zinat Tasneem Md.Manirul Islam Md.Robiul Islam Md.Faisal R.Badal Sarafat H.Abhi Subrata K.Sarker Prangon Das Department of Mechatronics Engineering Rajshahi University of Engineering&TechnologyRajshahi6204Bangladesh Department of Electrical Engineering Qatar UniversityDoha2713Qatar

The major hindrances in the energy system are ecological consciousness, lack of clean and sustainableenergy management, insufficient energy distribution–transmission–optimization, expensive power transfercosts, and increased customer knowledge of energy charges. Thus why, universal access to the grid with highcybersecurity, and reliability is needed to solve all these challenges. The digital twin concept turns a newdimension of technology into the world. Electric Digital Twin grid can perform online analysis of the grid inreal-time and integrates all the past and present data and express the current grid status to the producers andconsumers and also predicts the future grid status. Thus, the power grid transmission loss and location of theoverheated line and power connection missing can be detected in addition decision-making and self-healingcan possible. The future prediction saves the power grid from small to long accidents such as power outagesand even blackout problems. The whole consumers and nation feel relief from these types of accidents andsaves from large economic and business loss. The blockchain-enabled digital twin grid provides high securityfor the grid from cyberattacks. The paper conveys the framework of the electric digital twin grid and theconcept of the DT grid processing and the way of serving the producer, prosumers, consumers even the wholenation in infrastructure, education, research, economic, business, and political development.

关键词： Electric digital twin grid Online analysis of grid Cloud platform of grid Real-time grid analysis Self-healing Cybersecurity

Use of Renewable Energy Sources in Saudi Arabia through Smart Grid

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Journal of Energy and Power Engineering 2012年第7期6卷 1065-1070页

作者： Faisal R. Pazheri Nazar H. Malik Abdulrehman A. Al-Arainy Safoora Ottukulotk Mohd F. Othman Essam A. AI-Ammar Imthias ahamed T. P. Electrical Engineering Department College of Engineering King Saud University Riyadh 11421 Saudi Arabia Centre for Artificial Intelligence & Robotics Faculty of Electrical Engineering Universiti Teknologi Malaysia Kuala Lumpur54100 Malaysia Electronics & Communication Engineering Department College of Engineering Thalassery Kannur 670107 Kerala India

Even though Saudi Arabia is the world＇s largest producer and exporter of petroleum and petroleum based products, it is also blessed with high potential of renewable energy sources like solar and wind. Untapped wind and solar energy sources, which are abundant throughout the kingdom, can be connected and optimally integrated into the grid through the use of smart grid technologies and the expansion of transmission facilities. Smart grid is an auto-balancing, self-monitoring power grid that accepts power from any source of fuel like oil, sun or wind and delivers electricity from suppliers to consumers. It helps to control the use of appliances in order to save energy, reduces cost and increase reliability. This paper describes the attributes of a smart grid and how these act as driving force to modernize the electrical power grid. The necessity of conservation of oil in Saudi Arabia is argued. Moreover, the vast availability of renewable energy sources like solar and wind in Saudi Arabia and advantages in utilizing these sources through smart grid technologies are advocated in this paper.

关键词： Solar energy wind energy smart grid conserving oil megawatt.

旁观者目击与心肺复苏对成人院外心跳骤停预后的影响

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岭南急诊医学杂志 2017年第6期22卷 524-527页

作者：文隽永廖瑾莉蒋龙元熊艳 ahamed Idris 中山大学附属第一医院 510080 中山大学孙逸仙纪念医院德克萨斯大学西南医学中心，达拉斯

目的:探讨旁观者目击与心肺复苏(CPR)对成人院外心脏骤停(OHCA)预后的真实影响。方法:以北美复苏终点联盟纳入PRIMED研究的成年心源性OHCA共11875例为研究对象,运用Logistic回归评价旁观者目击和旁观者CPR对成年心源性OHCA预后的影响。... 详细信息

目的:探讨旁观者目击与心肺复苏(CPR)对成人院外心脏骤停(OHCA)预后的真实影响。方法:以北美复苏终点联盟纳入PRIMED研究的成年心源性OHCA共11875例为研究对象,运用Logistic回归评价旁观者目击和旁观者CPR对成年心源性OHCA预后的影响。结果:旁观者目击较无旁观者目击OHCA在院前自主循环恢复、存活出院、出院时良好神经功能恢复等预后指标上明显改善;旁观者CPR可明显改善旁观者目击OHCA院前自主循环恢复、存活出院和出院时良好神经功能恢复;但对未被目击OHCA,旁观者CPR对存活出院和良好神经功能恢复的改善无统计学差异。结论:旁观者目击和CPR显著改善OHCA预后,但对无旁观者目击OHCA实施CPR对预后无显著改善效应。

关键词：院外心脏骤停旁观者目击心肺复苏预后

带非齐次项和Sobolev-Hardy临界指数的奇异椭圆方程的多解(英文)

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南京师大学报（自然科学版） 2008年第4期31卷 1-7页

作者：穆罕麦德沈尧天姚仰新华南理工大学数学科学学院广东广州510640 布鲁尼尔大学工程学院数学部苏丹

设2*=2(N+α)(N-2+β),N≥3,是极限Sobolev指数,ΩRN是RN中的开子集.在f(x)∈Hβ-1满足合适的条件且f(x)≠0下,讨论了一个带非齐次项和Sobolev-Hardy临界指数的含权的椭圆型问题:{-div(|x|β▽u)=|x|αup*-1+εf(x),x∈Ω,u>0,x∈Ω,u=0,x∈Ω,,存在两个解u和-u在H01,,βp(Ω)中,且有u≥0,u-≥0对所有的f(x)≥0.值得注意的是,当f(x)=0时一般不成立.

关键词： p-阶拉普拉斯方程临界指数最佳常数 Sobolev-Hardy不等式

一杯咖啡的时光印度Buy Me A Coffee共享办公空间

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室内设计与装修 2020年第7期 74-79页

作者：麦子(编译) 无 Nahal ahamed Anas Mohamed Salman Faris Harsh Uzman Sanam Sakeer Justin Sebastian(摄影) 不详 Artystry

本案为Buy Me A Coffee位于喀拉拉邦卡利卡特市HILITE商业园区内的共享办公空间。该办公空间面积约为223 m2,占据了这栋办公楼的第三层。公司有一个有趣的名字"Buy Me A Coffee"(为我买杯咖啡),也希望能为使用者,尤其是年轻的科技工作... 详细信息

本案为Buy Me A Coffee位于喀拉拉邦卡利卡特市HILITE商业园区内的共享办公空间。该办公空间面积约为223 m2,占据了这栋办公楼的第三层。公司有一个有趣的名字"Buy Me A Coffee"(为我买杯咖啡),也希望能为使用者,尤其是年轻的科技工作者提供一个更为轻松、有趣、无压力的办公环境。基于业主的愿景,设计师决定采用现代、极简主义设计风格,以独特的空间布局和建筑结构予以响应。该办公空间承担了从项目发布、日常办公到阳台日光浴等各种功能性的需求。

关键词：办公空间空间布局办公环境科技工作者共享办公日常办公喀拉拉邦阳台

含临界指数的双调和问题非平凡解的存在性(英文)

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南京师大学报（自然科学版） 2007年第4期30卷 1-5页

作者：穆罕麦德沈尧天姚仰新华南理工大学数学科学学院广东广州510640 布鲁奈尔大学工程学院数学部苏丹

讨论如下含临界指数的双调和方程非平凡解的存在性Δ2u=μu|x|s+|u|2*-2u+λu+f(x),x∈Ω,u=uv=0,x∈Ω.其中ΩRN是有界光滑区域,0∈Ω,N≥5,0≤s≤4,0≤μ<μ-=N(N4-4)2,2*=N2-N4为W2,2(Ω)中Sobolev嵌入的临界指数,u,v表示Ω的外法线... 详细信息

关键词：双调和方程 Sobolev临界指数非平凡解

印度Ganga-Meghna-Brahmaputra平原及周围地区与孟加拉国地下水砷污染及其对健康影响的19年研究

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中国地方病学杂志 2007年第1期26卷 43-47页

作者： ahamed S Hossain MA Mukharjee A Sengupta MK Das B Nayak B Pal A Mukherjee SC Pati S Dutta RN Saha KC Quamruzzaman Q Chakraborti D 付松波（译）孙殿军（审校）印度柯尔喀塔Jadavpur大学环境研究学院 700032 孟加拉围达卡大学统计研究与训练学院印度柯尔喀塔医学院神经科印度柯尔喀塔SSKM医院医学教育研究生学院妇产科印度柯尔喀塔热带病学研究院皮肤科孟加拉国Dhaka社区医院不详

基于近19年对印度Ganga—Meghna—Brahmaputra（简称GMB）平原（面积569749km^2，人口超过5亿）地下水砷污染的调查，可以确定印度Ganga—Brahmaputra平原（包括北方邦、比哈尔邦、恰尔康得邦、西孟加拉邦、阿萨姆邦）和孟加拉国普遍受... 详细信息

基于近19年对印度Ganga—Meghna—Brahmaputra（简称GMB）平原（面积569749km^2，人口超过5亿）地下水砷污染的调查，可以确定印度Ganga—Brahmaputra平原（包括北方邦、比哈尔邦、恰尔康得邦、西孟加拉邦、阿萨姆邦）和孟加拉国普遍受到砷的污染。近期的调查研究也表明，除米佐拉姆邦外，其他各邦的地下水也受到不同程度的砷污染。至今为止．已对印度各邦和孟加拧国的175000份和50808份压把井水样进行了含砷量检测。并组织了一支包括皮肤科、神经科和妇产科医生在内的有经验的专家组，对上述地区125000人进行了临床检查，其中9％患有砷导致的皮肤病损症状。至今共采集分析了60000份生物样品。包括发样、指甲、尿样及皮肤鳞屑，其中80％的样品含砷量超过允许值，很多人由此受到砷的亚临床损害。在上述砷暴露地区．19000名儿童经过检查，近1100人患有砷导致的皮肤病损。该调查结果表明．儿童比成人更容易受到砷的毒性损害。在这种状况下．应着力解决饮水安全问题来减轻砷的苊害．

关键词：砷饮水皮肤疾病神经毒性妊娠结局

An Assessment of Aquifer Potential in and around a Proposed Well Field Area near Madunaghat, Chattogram Using Isotopic Techniques

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Journal of Water Resource and Protection 2021年第6期13卷 395-418页

作者： Nasir Ahmed Manzoor Ahamad Choudhry Mohammed Khaliquzzaman Arif ahamed Mohammad Abdul Quaiyum Bhuiyan Nipa Deb Tasrina Rabia Choudhury Mohammad Masud Karim Sheikh Mohammad Mahbubur Rahman Mohammad Murshed Alam Abul Khair Mohammed Fazlullah Mohammed Ariful Islam Isotope Hydrology Division Institute of Nuclear Science and Technology Bangladesh Atomic Energy Commission Dhaka Bangladesh Isotope Hydrology Section International Atomic Energy Agency Vienna Austria The World Bank Dhaka Bangladesh Chemistry Division Atomic Energy Centre Dhaka Bangladesh Institute of Water Modelling Dhaka Bangladesh Chattogram Water Supply and Sewerage Authority Chattogram Bangladesh

The study was undertaken for understanding the potential of deep aquifers as a source of safe drinking water and for assessing the status of groundwater aquifer near Madunaghat area, Chattogram. The specific issues are salinity, interconnectivity of the shallow and deep aquifers, mixing of groundwater with the adjacent Halda river water, recharge condition and groundwater age. The isotopic data suggest that most of the groundwater results from a mixture between recent recharge and an older component recharge under climatic conditions cooler than at present. The interconnectivity between shallow aquifers and river waters are mostly found in the line wells installed particularly in shallow depth (16 m) close to Halda river as evidenced from the similar tritium values of sampled line well water with that of the Halda river water. The groundwater in Madunaghat well field area is not affected by salinity, as it is evidenced by higher values of Na/Cl ratio of the groundwater samples compared to the sea water fresh water mixing line. The geochemistry of intermediate and deep groundwater is dominated by Na-Mg-HCO3 and Na-HCO3 type waters. Even the relationship between chloride and oxygen-18 (Cl-δ18O) depicts that the waters from the deep, intermediate and shallow wells do not fall on the seawater mixing line. The Carbon-14 contents of intermediate to deep groundwater samples vary from 16.2 to 59.3 pMC indicating the residence time in the range of 4300 to 15,000 years BP, i.e., the sourced water recharged the aquifers a long time ago. The intermediate and deep wells have water with arsenic concentrations less than the detection limit of 3.0 μg/L. Only a few shallow wells have arsenic concentrations greater than the detection limit varying from 13.7 - 47.4 μg/L, which is less than the DoE permissible limit (50 μg/L) implying that the groundwater at Madunaghat area is not affected by Arsenic contamination.

关键词： Stable Isotope Tritium Carbon-14 Salinity Chloride Recharge Residence Time