检索结果-南通市图书馆

Comprehensive DNA barcode reference library and optimization of genetic divergence threshold facilitate the exploration of species diversity of green lacewings (Neuroptera: Chrysopidae)

在线全文

学校读者我要写书评

暂无评论

Insect Science 2024年第2期31卷 613-632页

作者： Yan Lai Kaiyu Li Xingyue Liu deparment of Entomology Cllege of Plant ProtectionChina Agricultural UniversityBejingChina College of Bioogical Sciencs China Agricultural UniversityBeijingChina

Chrysopidae are a family of Neuroptera of significant importance in biocontrol against agricultural pests because of their predatory ***,the taxonomy of Chrysopidae lacks a comprehensive revision,which impedes the exploration of species diversity as well as the selection and the conservation of green lacewings as biocontrol *** have established a DNA barcode reference library of the Chinese green lacewings based on an approximately complete sampling(95.63%)in 25 of the 34 provincial regions in China,comprising 1119 barcodes of 25 genera and 197 species(representing 85%genera and 43.62%species from China).Combining other 1049 high quality green lacewing DNA barcodes,we first inferred the optimal threshold of interspecific genetic divergence(1.87%)for successful species identification in multiple simulated scenarios based on present *** further inferred the threshold of genetic divergence(7.77%)among genera with biocontrol *** inference and performance of the threshold appears to be mainly associated with the completeness of sampling,the proportion of closely related species,and the analytical *** new combinations,Apertochrysa platypa(Yang&Yang,1991)***.,Apertochrysa shennongana(Yang&Wang,1990)***.,Apertochrysa pictifacialis(Yang,1988)***.,Apertochrysa helana(Yang,1993)***.,Plesiochrysa rosulata(Yang&Yang,2002)***.,and Signochrysa hainana(Yang&Yang,1991),are proposed according to integrative species *** library and optimal threshold will effectively facilitate the exploration of species diversity of green *** study also provides a methodological reference in molecular delimitation of other insects.

关键词： Chrysopidae DNA barcode genetic distance optimal threshold species delimitation

Fast and Adaptive Multi-Agent Planning under Collaborative Temporal Logic Tasks via Poset Products

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research 2024年第2期2024卷 81-94页

作者： Zesen Liu Meng Guo Weimin Bao Zhongkui Li deparment of Mechanics and Engineering Science College of EngineeringPeking UniversityBejing 0081 China Science and Technology Commission of China Aerospace Science and Technology Corporation Beijing 100048China

Efficient coordination and planning is essential for large-scale multi-agent systems that collaborate in a shared dynamic environment. Heuristic search methods or learning-based approaches often lack the guarantee on correctness and performance. Moreover, when the collaborative tasks contain both spatial and temporal requirements, e.g., as linear temporal logic (LTL) formulas, formal methods provide a verifiable framework for task planning. However, since the planning complexity grows exponentially with the number of agents and the length of the task formula, existing studies are mostly limited to small artificial cases. To address this issue, a new planning paradigm is proposed in this work for system-wide temporal task formulas that are released online and continually. It avoids two common bottlenecks in the traditional methods, i.e., (a) the direct translation of the complete task formula to the associated B點hi automaton and (b) the synchronized product between the B點hi automaton and the transition models of all agents. Instead, an adaptive planning algorithm is proposed, which computes the product of relaxed partially ordered sets (R-posets) on-the-fly and assigns these subtasks to the agents subject to the ordering constraints. It is shown that the first valid plan can be derived with a polynomial time and memory complexity with respect to the system size and the formula length. Our method can take into account task formulas with a length of more than 400 and a fleet with more than 400 agents, while most existing methods fail at the formula length of 25 within a reasonable duration. The proposed method is validated on large fleets of service robots in both simulation and hardware experiments.

关键词： hardware service system

Investigation on cavitating turbulent flow for the twisted NACA66 hydrofoil using a PANS model with helicity modification

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2024年第2期36卷 219-231页

作者： Chen Geng Zhao-hui Qian Ke-xin Zheng Wei-xiang Ye Xian-wu Luo State Key Laboratory of Hydroscience cand Engineering Deparment of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Institute of Nuclear and New Energy Technology Tsinghua UniversityBeijing 100084China

In the present paper,the unsteady cavitating turbulent flow over the twisted NACA66 hydrofoil is investigated based on an modified shear stress transfer k-ωpartially averaged Navier-Stokes(MSST PANS)model,i.e.,new MSST PANS(NMSST PANS)model,where the production term of kinetic energy in the turbulence model is modified with *** with the experimental data,cavitation evolution and its characteristic frequency are satisfactorily predicted by the proposed NMSST PANS *** is revealed that the interaction among the main flow,the reentrant jets,and sheet cavitation causes the formation of the primary shedding cavity near the mid-span and the secondary shedding cavity at each side of the twisted hydrofoil,and further induces the remarkable pressure gradient around shedding *** with the development of the primary and the secondary shedding cavities,the great pressure gradient associated with large cavity volume variation promotes the vortical flow generation and the spatial deformation of vortex structure during cavitation evolution,and results in the primary and the secondary U-type ***,dynamic mode decomposition(DMD)analysis is utilized to confirm the interaction among the main flow,the main reentrant jet and two side reentrant jets,and *** results indicate that the proposed NMSST PANS model is suitable to simulate the complicated cavitating turbulent flow for various engineering applications.

关键词： Cavitating turbulent flow partially averaged Navier-Stokes(PANS)model hydrofoil numerical simulation

Connecting cellular mechanisms and extracellular vesicle cargo in traumatic brain injury

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2024年第10期19卷 2119-2131页

作者： Nikita Ollen-Bittle Austyn D.Roseborough Wenxuan Wang Jeng-liang D.Wu Shawn N.Whitehead Department of Anatomy and Cell Biology Western UniversityLondonONCanada Schulich School of Medicine and Dentistry Western UniversityLondonONCanada deparment of Clinical Neurological Sciences Western UniversityLondonONCanada

Traumatic brain injury is followed by a cascade of dynamic and complex events occurring at the cellular level. These events include: diffuse axonal injury, neuronal cell death, blood-brain barrier break down, glial activation and neuroinflammation, edema, ischemia, vascular injury, energy failure, and peripheral immune cell infiltration. The timing of these events post injury has been linked to injury severity and functional outcome. Extracellular vesicles are membrane bound secretory vesicles that contain markers and cargo pertaining to their cell of origin and can cross the blood-brain barrier. These qualities make extracellular vesicles intriguing candidates for a liquid biopsy into the pathophysiologic changes occurring at the cellular level post traumatic brain injury. Herein, we review the most commonly reported cargo changes in extracellular vesicles from clinical traumatic brain injury samples. We then use knowledge from animal and in vitro models to help infer what these changes may indicate regrading cellular responses post traumatic brain injury. Future research should prioritize labeling extracellular vesicles with markers for distinct cell types across a range of timepoints post traumatic brain injury.

关键词： axonal injury biomarkers blood-brain barrier chronic traumatic encephalopathy extracellular vesicles glial activation neuroinflammation traumatic brain injury

Aerodynamic optimization of an adaptive flap for next-generation green aircraft

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2024年第2期37卷 100-122页

作者： Tianlong LIN Rosario PECORA Danilo CILIBERTI Wei XIA Shuling HU State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace EngineeringXi’an Jiaotong UniversityXi’an 710049China deparment of Industrial Engineering Aerospace DivisionUniversity of Naples"FEDERICO II"Napoli 80125Italy

Adaptive,morphing flaps are taking ever-increasing attention in civil aviation thanks to the expected benefits this technology can bring at the aircraft level in terms of high-lift performance improvement and related fuel burnt reduction per *** upon morphing capabilities,it is possible to fix a unique setting for the flap and adapt the flap shape to match the aerodynamic requirements for take-off or *** proper morphed shapes can assure better high-lift performances than those achievable by referring to a conventional ***,standing the unique flap setting for take-off and landing,a dramatic simplification of the flap deployment systems may be *** a consequence of this simplification,the deployment system can be fully hosted in the wing,thus avoiding under-wing nacelles with significantly better aerodynamics and fuel *** first step for a rational design of an adaptive flap consists in defining the target morphed shapes and the unique optimal flap setting in the take-off and landing *** this work,aerodynamic optimization analyses are carried out to determine the best flap setting and related morphed shapes in compliance with the take-off and landing requirements of a reference civil transport *** different initial conditions are adopted to avoid the optimization falling into local optima,thus obtaining four groups of optimal candidate *** comparing each candidate’s performance through 2D and 3D simulations,the optimal configuration has been selected.2D simulations show that the optimal configuration is characterized by a maximum lift increase of 31.92%in take-off and 9.04%in *** to 3D simulations,the rise in maximum lift equals 22.26%in take-off and 3.50%in *** results are finally verified through wind tunnel tests,and the aerodynamic mechanism behind the obtained improvements is explained by carefully analyzing the flow field around the flap.

关键词： Morphing wings High-lift system Adaptive flap Computational Fluid Dynamics(CFD) Wind tunnel tests

Emerging applications of nanofibers electrospun from carbohydrate polymers

在线全文

学校读者我要写书评

暂无评论

Journal of Future Foods 2024年第4期4卷 289-299页

作者： Nicole Angel Songnan Li Lingyan Kong deparment of Mechanical Engineering.The University of Alabama TuscaloosaAL 35487USA Joint Intemnarional Research Laboratory of Agriculture and Agni-Product Saferty of the Ministry of Education of China Institutes of Agricultural Science and Techmology DevelopmentYangzhou UniversityYangzhou 225009China deparment of Human Nutrition and Hospitality Management The University of AlabamaTuscaloosaAI 35487USA

Electrospinning is a simple and versatile technique that uses electrostatic forces to create fbers in the nano o micro range from a variety of materials,both synthetic and natural Due to the high surface area to volume ratio,high porosity,and desirable mechanic characteristics of electrospun fbers,they are of current interest for a wide variety of *** of the most signifcant applications of these fbers being researched include tissue *** delivery,wound dressings,environmental and energy applications,and protective ***,electrospun fbers may be specially tailored to better ft their fnal application through the direct 1oading of materials during the spining process as well as by choosing the correct base material for the *** example,it is desirable to use a biocompatible and biodegradable material in fibers desired for applications in the biomedical field;this way the fbers are able to safely interact with the human *** review will explore the applications,as previously listed,with a focus on how fbers are made using carbohydrate polymers(such as alginate,cellulose and its derivatives,chitosan and chitin,starch,pul1ulan,hyaluronic acid,dextran,and 1evan)as their base material,and their applicability and functionality in various applications.

关键词： Electrospinning Tissue engineering Drug delivery Wound dresing Envionment Energy Protective fabric

Physico-chemical properties of wild edible fruit Meyna laxifora Robyns(Alu):production of Alu fruit powder by using drying aid

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Future Foods 2024年第4期4卷 353-360页

作者： Rohini Vijay Dhenge Arjun Mohanakumar Suhel Bhendawade Prashant Chavhan Sagar Deshpande Pooja Lade Abhijeet Gatade Akshaya kumar Sahoo deparment of Food and Dnug.University of Parma Parma 43124.Italy Deparoment of Food Science and Technolog Shivaji UniversityKolhapurMaharashtra 416004.India

The study focuses on the physico-chemical characteritics of the wild fruit Meyna laxiflora Robyns(Alu)and fruit powder,which was gathered from the Konkan region of Maharashtra Alu fruit powder is made by using a drying aid called maltodextrin(MD).Powder samples(MP1,MP2,MP3,MP4 and MP5)were made using different amounts of MD(05,10,15,2.0 and 2.5 g).Preliminary phytochemical screening of fnuit pulp and powder showed the presence of some phytoconstituents such as reducing sugar,saponin,flavonoids,and terpenoids,whereas akaloids,tannins,steroids and protein were absent in *** parameters of the powder are durectly infuenced by the amount of MD,as evidenced by the variations in bulk density,total soluble solids,pH,specific gravity and the proximate among the powder *** solubility was found in the sample with a medium of *** highest of particle distribution was found in MD-added samples MP2(1 g),MP3(1.5 g),MP4(2 g)whereas the raw(MPO)showed the *** analysis was done using 9-point hedonic scale,which revealed that MP2,MP3,and MP4 were highly *** study assumed that fresh Alu fuit,palp and in the form of powder can be useful for the development of new products.

关键词： Meyna laxiflora Robyns Maltodextrin Solubility Particle size distribution Sensory analysis

Effect of the Filling Liquid Ratio on the Thermal Performance of a Novel Thermal Diode with Wick

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal Science 2024年第2期33卷 396-407页

作者： LI Zhiyong MING Tingzhen ZHANG Heyu ZHAO Sitong WANG Qinggang CAI Cunjin YIN Kui FANG Yueping WU Yongjia School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan430070China Sanya Science and Education Innovation Park Wuhan University of TechnologySanya572004China deparment of Four Station Logistics AcademyXuzhou221000China School of Energy Construction and EnvironmentCoventry UniversityPriory StreetCoventryCV15FBUK

The application of thermal diodes,which allow heat to flow more readily in one direction than the other,is an important way to reduce energy consumption in buildings and enhance the battery heat dissipation of electric *** on various factors including the specific design,materials used,and operating conditions,the convective thermal diode can exhibit the best thermal rectification effect in intended applications compared to the other thermal *** this study,a novel convective thermal diode with a wick was proposed based on the phase change heat transfer *** design takes advantage of both capillary forces provided by the wick and gravity to achieve enhanced unidirectional heat transfer performance for the designed convective thermal *** effect of the filling liquid ratio on the thermal performance of the thermal diode was experimentally investigated,which was in good agreement with the theoretical *** research findings showed that with an optimal liquid filling ratio of 140%,the thermal diode with a wick can achieve a better thermal rectification ratio when subjected to a lower heating power,and the maximum thermal rectification ratio of 21.76 was experimentally achieved when the heating power of the thermal diode was 40 W.

关键词： filling liquid ratio thermal diode wick structure gravity

Mechanism of microbial spore inactivation through electromagnetic radiations:a review

在线全文

学校读者我要写书评

暂无评论

Journal of Future Foods 2024年第4期4卷 324-334页

作者： Piyush Sharma Arun Prasath Venugopal Parag Prakash Sutar Hong-wei Xiao Qi Zhang deparment of Food Process Engineering.National Institute of Techmology Rourkela Odisha 769008India College of Engineering China Agriculural UniversityBeijing 100083China School of Mechanical Engineering Yangzhou UTniversiny Yangzhou 225002China

Spores are the biological structures formed out of sporulation from vegetative cells in adverse *** tolerant to many extreme environment and conditions,they escape and survives critical processing steps in the food industry that poses food and health safety problems,as is evident from the increase in reports of food-bome outbreaks due to *** radiation(EM)is used for rapid decontamination and sterilization purposes in the food *** studies have reported a greater reduction in spore population upon irradiation with EM rays due to its impact on genomic material and other components of spores that destabilises overall structue and brings clonogenic death However,there is scattered literature regarding the mechanism of its inactivation and resistance against such *** review attempts to concisely evaluate the potential of electromagnetic radiations in spore inactivation and details its mechanism through a collective study of scientific results and *** also briefs about the process of sporulation,the structure of spores and the role of its components in the resistance of spores to *** studies,which demonstrated that combining various EM treatments might be an effective way for inactivation of spores,were discussed in detail.

关键词： Spore structure Electromagnetic radiations Mechanism of inactivation Damage resistance