检索结果-南通市图书馆

Air traffic monitoring using optimized ADS-B CubeSat constellation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Astrodynamics 2024年第1期8卷 189-208页

作者： Ghulam Jaffer Rameez AMalik Elias Aboutanios Nazish Rubab Ronnie Nader Hans U.Eichelberger guy A.E.Vandenbosch Interdisciplinary Centre for Security Reliability and Trust(SnT)University of LuxembourgLuxembourg1855Luxembourg

The primary technique used for air traffic surveillance is ***,nowadays,its role in surveillance is gradually being replaced by the recently adopted Automatic Dependent Surveillance-Broadcast(ADS-B).ADS-B offers a higher accuracy,lower power consumption,and longer range than radar,thus providing more safety to *** coverage of terrestrial radar and ADS-B is confined to continental parts of the globe,leaving oceans and poles uncovered by real-time surveillance *** study presents an optimized Low-Earth Orbit(LEO)-based ADS-B constellation for global air traffic surveillance over intercontinental trans-oceanic flight *** optimization algorithm is based on performance evaluation parameters,i.e.,coverage time,satellite availability,and orbit stability(precession and perigee rotation),and communication *** results indicate that the constellation provides ample coverage in the simulated global oceanic *** constellation is a feasible and cost-effective solution for global air supervision,which can supplement terrestrial ADS-B and radar systems.

关键词： constellation automatic dependent surveillance-broadcast (ADS-B) air traffic surveillance precession perigee rotation.

Genomics,transcriptomics,and peptidomics of the greater wax moth Galleria mellonella neuropeptides and their expression in response to lead stress

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Insect Science 2024年第3期31卷 773-791页

作者： Li-Lin Luo Yang Lin Jun-Hong Linghu Wei Gong Yuan-Hong Luo Man Liu Dao-Chao Jin guy Smagghe Tong-Xian Liu Shun-Hua Gui Tian-Ci Yi Guizhou Provincial Key Laboratory for Agricultural Pest Management of the Mountainous Region Institute of EntomologyGuizhou UniversityGuiyangGuizhouChina Guizhou Institute of Biology Guizhou Academy of SciencesGuiyangChina Institute of Plant Health and Medicine Guizhou UniversityGuiyangChina

Neuropeptides are crucial in regulation of a rich variety of developmental,physiological,and behavioral functions throughout the life cycle of *** an integrated approach of multiomics,we identified neuropeptide precursors in the greater wax moth Galleria mellonella,which is a harmful pest of honeybee hives with a worldwide ***,a total of 63 and 67 neuropeptide precursors were predicted and annotated in the *** genome and transcriptome,in which 40 neuropeptide precursors were confirmed in the *** ***,we identified 12 neuropeptide precursor genes present in *** but absent in honeybees,which may be potential novel pesticide target *** hives were contaminated with heavy metals such as lead,enabling its bioaccumulation in *** bodies through the food chain,we performed transcriptome sequencing to analyze the effects of Pb stress on the mRNA expression level of *** neuropeptide *** treatment by Pb,the expression of neuropeptide F1 was found to be significantly downregulated,implying that this neuropeptide might be associated with responding to the heavy metal stress in *** study comprehensively identified neuropeptide precursors in ***,and discussed the effects of heavy metals on insect neuropeptides,with the example of *** results are valuable for future elucidation of how neuropeptides regulate physiological functions in *** and contribute to our understanding of the insect's environmental plasticity and identify potential new biomarkers to assess heavy metal toxicity in insects.

关键词： Galleria mellonella genomics heavy metal stress neuropeptide peptidomics transcriptomics

High-speed silicon photonic electro-optic Kerr modulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2024年第1期12卷 51-60页

作者： JONATHAN PELTIER WEIWEI ZHANG LEOPOLD VIROT CHRISTIAN LAFFORGUE LUCAS DENIEL DELPHINE MARRIS-MORINI guy AUBIN FARAH AMAR DENH TRAN XINGZHAO YAN CALLUM G.LITTLEJOHNS CARLOS ALONSO-RAMOS KE LI DAVID J.THOMSON GRAHAM REED LAURENT VIVIEN University Paris-Saclay CNRSCentre for Nanoscience and Nanotechnology(C2N)Palaiseau 91120France University Grenoble Alpes CEALETIGrenoble 38000France Optoelectronics Research Centre Zepler Institute for Photonics and NanoelectronicsFaculty of Engineering and Physical SciencesUniversity of SouthamptonSouthampton SO171BJUK

Silicon-based electro-optic modulators contribute to easing the integration of high-speed and low-power consumption circuits for classical optical communications and data *** the plasma dispersion modulation,an alternative solution in silicon is to exploit the DC Kerr effect,which generates an equivalent linear electro-optical effect enabled by applying a large DC electric *** some theoretical and experimental studies have shown its existence in silicon,limited contributions relative to plasma dispersion have been achieved in high-speed modulation so *** paper presents high-speed optical modulation based on the DC Kerr effect in silicon PIN *** contributions of both plasma dispersion and Kerr effects have been analyzed in different waveguide configurations,and we demonstrated that the Kerr induced modulation is dominant when a high external DC electric field is applied in PIN ***-speed optical modulation response is analyzed,and eye diagrams up to 80 Gbit/s in NRZ format are obtained under a *** of 30 *** work paves the way to exploit the Kerr effect to generate high-speed Pockels-like optical modulation.

关键词： waveguide dispersion effect

Design Optimization of a Lattice Tower: Structure and Foundations

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Applied Sciences 2024年第2期14卷 483-493页

作者： Cossi Télesphore Nounangnonhou guy Clarence Semassou Kossoun Alain Tossa Noémie Sintondji Laboratory of Energetics and Applied Mechanics (LEMA) University of Abomey-Calavi Abomey-Calavi Benin Laboratory of Electrotechnics Telecommunications and Applied Informatics (LETIA) University of Abomey-Calavi Abomey-Calavi Bénin

Produced in power plants, electrical energy is transported to places of consumption via the electricity network. At the heart of this network are the supports that allow electricity to be efficiently transported over long distances, guaranteeing the security and supply of energy to the various centers of use. In the construction of a line, supports occupy an important part in terms of safety and construction cost. It is therefore essential to optimize their use to reduce the cost of transmission lines. This work addresses this problem, which focuses on the optimal utilization of X-lattice towers in the construction of overhead power lines. The challenge is to reconcile the search for optimal cost and respect for the design, resistance and service constraints of the structure. To do this, a parameter having a strong correlation with the weight, foundation and construction cost of the X-lattice tower for 161 kV lines is determined as an important cost variable. This parameter is the wheelbase of the towers. The junction point between the structure and the foundations is obtained by measuring the forces at the base of the tower following the lowering of the loads. These efforts make it possible to size foundations which are of the inverted or isolated sole type. The results obtained reveal that from 8 meters in width, the wheelbase gradually changes until the optimum is obtained at 6.29 meters. With this wheelbase, the production cost is optimal. It clearly emerges from this study that the construction of lattice pylons with a wheelbase of approximately 6.29 meters makes it possible to optimize the cost of construction of 161 kV lines in the Republic of Benin.

关键词： Lattice Tower Wheelbase Cost Optimization Foundation

Projected impacts of climate change on the habitat of Xerophyta species in Africa

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Plant Diversity 2024年第1期46卷 91-100页

作者： Vincent Okelo Wanga Boniface KNgarega Millicent Akinyi Oulo Elijah Mbandi Mkala Veronicah Mutele Ngumbau guy Eric Onjalalaina Wyclif Ochieng Odago Consolata Nanjala Clintone Onyango Ochieng Moses Kirega Gichua Robert Wahiti Gituru Guang-Wan Hu CAS Key Laboratory of Plant Germplasm Enhancement and Specialty Agriculture Wuhan Botanical GardenChinese Academy of SciencesWuhan 430074China University of Chinese Academy of Sciences Beijing 100049China Sino-Africa Joint Research Center Chinese Academy of SciencesWuhan 430074China Centre for Integrative Conservation Xishuangbanna Tropical Botanical GardenChinese Academy of SciencesMenglun 666303China Botany Department Jomo Kenyatta University of Agriculture and TechnologyNairobiKenya East African Herbarium National Museums of KenyaP.O.Box 451660-0100NairobiKenya

Climate change poses a serious long-term threat to *** effectively reduce biodiversity loss,conservationists need to have a thorough understanding of the preferred habitats of species and the variables that affect their ***,predicting the impact of climate change on speciesappropriate habitats may help mitigate the potential threats to biodiversity ***,a monocotyledonous genus of the family Velloziaceae is native to mainland Africa,Madagascar,and the Arabian *** key drivers of Xerophyta habitat distribution and preference are *** 308 species occurrence data and eight environmental variables,the MaxEnt model was used to determine the potential distribution of six Xerophyta species in Africa under past,current and future climate change *** results showed that the models had a good predictive ability(Area Under the Curve and True Skill Statistics values for all SDMs were more than 0.902),indicating high accuracy in forecasting the potential geographic distribution of Xerophyta *** main bioclimatic variables that impacted potential distributions of most Xerophyta species were mean temperature of the driest quarter(Bio9)and precipitation of the warmest quarter(Bio18).According to our models,tropical Africa has zones of moderate and high suitability for Xerophyta taxa,which is consistent with the majority of documented species *** habitat suitability of the existing range of the Xerophyta species varied based on the climate scenario,with most species experiencing a range loss greater than the range gain regardless of the climate *** projected spatiotemporal patterns of Xerophyta species help guide recommendations for conservation efforts.

关键词： Africa Climate change MaxEnt model Potential suitable distribution Velloziaceae Xerophyta

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

美国企业计划在月球开采氮-3

国际航空 2024年第4期 68-69页

作者： guy Norris 不详

氢-3是一种珍贵的同位素,可以用于核聚变反应堆的燃料,是一种清洁能源。据信,月球上有大量的这种稀有元素,这使得它获得了太空采矿企业的青睐。当前,氯-3的价格非常昂贵,而且随着清洁能源需求不断增加,其需求还在不断增长。因此,从月球... 详细信息

氢-3是一种珍贵的同位素,可以用于核聚变反应堆的燃料,是一种清洁能源。据信,月球上有大量的这种稀有元素,这使得它获得了太空采矿企业的青睐。当前,氯-3的价格非常昂贵,而且随着清洁能源需求不断增加,其需求还在不断增长。因此,从月球土壤中提取氨一3成为一种颇有吸引力的业务。

关键词：核聚变反应堆采矿企业月球土壤清洁能源稀有元素同位素吸引力

我们在举办可持续活动时学到的5件事加拿大旅游目的地分享了一些关于如何可持续举办活动的见解

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中国会展 2024年第2期 62-63页

作者： guy Hall 不详

创造一个有影响力的活动不是一件小事。这是一项复杂的任务,需要细致的计划、协调和执行。然而,最近,人们越来越意识到会议行业可持续发展的重要性。将环境、社会和经济方面的可持续性纳入活动已成为规划师的关键考虑因素。2023年初,加... 详细信息

创造一个有影响力的活动不是一件小事。这是一项复杂的任务,需要细致的计划、协调和执行。然而,最近,人们越来越意识到会议行业可持续发展的重要性。将环境、社会和经济方面的可持续性纳入活动已成为规划师的关键考虑因素。2023年初,加拿大旅游局的商业活动团队在安大略省滑铁卢举办了“创新加拿大”活动。这次独家活动让来自世界各地的客户有机会亲眼目睹加拿大在先进制造业的创新和领导地位。这也是加拿大目的地的第一个碳中和活动,他们强调尽可能负责任地接待他们的客户。

关键词：旅游目的地先进制造业考虑因素碳中和安大略省行业可持续发展可持续性商业活动

Innovative Techniques Unveiled in Advanced Sheet Pile Curtain Design

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Open Journal of Civil Engineering 2024年第1期14卷 1-37页

作者： Peace Sèna Hounkpe guy Oyéniran Adéoti Patrick Oniakitan Mondoté Éric Adéchina Alamou Department of Civil Engineering Higher National School of Public Works (ENSTP) Abomey Benin Laboratory of Testing and Studies in Civil Engineering (L2EGC) National University of Science Technology Engineering and Mathematics (UNSTIM) Abomey Benin

This thorough review explores the complexities of geotechnical engineering, emphasizing soil-structure interaction (SSI). The investigation centers on sheet pile design, examining two primary methodologies: Limit Equilibrium Methods (LEM) and Soil-Structure Interaction Methods (SSIM). While LEM methods, grounded in classical principles, provide valuable insights for preliminary design considerations, they may encounter limitations in addressing real-world complexities. In contrast, SSIM methods, including the SSI-SR approach, introduce precision and depth to the field. By employing numerical techniques such as Finite Element (FE) and Finite Difference (FD) analyses, these methods enable engineers to navigate the dynamics of soil-structure interaction. The exploration extends to SSI-FE, highlighting its essential role in civil engineering. By integrating Finite Element analysis with considerations for soil-structure interaction, the SSI-FE method offers a holistic understanding of how structures dynamically interact with their geotechnical environment. Throughout this exploration, the study dissects critical components governing SSIM methods, providing engineers with tools to navigate the intricate landscape of geotechnical design. The study acknowledges the significance of the Mohr-Coulomb constitutive model while recognizing its limitations, and guiding practitioners toward informed decision-making in geotechnical analyses. As the article concludes, it underscores the importance of continuous learning and innovation for the future of geotechnical engineering. With advancing technology and an evolving understanding of soil-structure interaction, the study remains committed to ensuring the safety, stability, and efficiency of geotechnical structures through cutting-edge design and analysis techniques.

关键词： Sheet Pile Curtain Design Soil-Structure Interaction Geotechnical Engineering Advanced Design Techniques Finite Element Analysis Innovative Geotechnical Methods

Advanced Sheet Pile Curtain Design: Case Study of Cotonou East Corniche

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Civil Engineering 2024年第1期14卷 38-64页

This paper delves into the critical aspects of sheet pile walls in civil engineering, highlighting their versatility in soil protection, retention, and waterproofing, all while emphasizing sustainability and efficient construction practices. The paper explores two fundamental approaches to sheet pile design: limit equilibrium methods and numerical techniques, with a particular focus on finite element analysis. Utilizing the robust PLAXIS 2016 calculation code based on the finite element method and employing a simplified elastoplastic model (Mohr-Coulomb), this study meticulously models the interaction between sheet pile walls and surrounding soil. The research offers valuable insights into settlement and deformation patterns that adjacent buildings may experience during various construction phases. The central objective of this paper is to present the study’s findings and recommend potential mitigation measures for settlement effects on nearby structures. By unraveling the intricate interplay between sheet pile wall construction and neighboring buildings, the paper equips engineers and practitioners to make informed decisions that ensure the safety and integrity of the built environment. In the context of the Cotonou East Corniche development, the study addresses the limitations of existing software, such as RIDO, in predicting settlements and deformations affecting nearby buildings due to the substantial load supported by sheet pile walls. This information gap necessitates a comprehensive study to assess potential impacts on adjacent structures and propose suitable mitigation measures. The research underscores the intricate dynamics between sheet pile wall construction and its influence on the local environment. It emphasizes the critical importance of proactive engineering and vigilant monitoring in managing and mitigating potential hazards to nearby buildings. To mitigate these risks, the paper recommends measures such as deep foundations, ground improvement tech

关键词： Sheet Pile Walls and Structural Analysis Soil-Structure Interaction Modeling Structural Sustainability Cotonou East Corniche Sustainable Construction Plaxis Calculation Code Settlement Mitigation