检索结果-南通市图书馆

Optimization of the methane production in batch anaerobic digestion of maize straw by adjustment of total solid and substrate-to-inoculum ratio based on kinetics

在线全文

学校读者我要写书评

暂无评论

international Journal of Agricultural and Biological Engineering 2024年第1期17卷 225-231页

作者： Feng Zhen Tao Xing Lianhua Li Yongming Sun Hongqiong Zhang Guangzhou institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China Guangdong Provincial Key Laboratory of New and Renewable Energy Research and Development Guangzhou 510640China College of Engineering Northeast Agricultural UniversityHarbin 150030China

Anaerobic digestion(AD)operating under conditions of organic overload stress typically exacerbates the potential for process instability,thereby resulting in significant economic and ecological *** this investigation,an augmented substrate-to-inoculum ratio(S/I)along with varying total solid content(TS)levels was employed to replicate diverse organic loadings,utilizing maize straw and cattle *** findings reveal that a moderate augmentation in S/I and TS proves advantageous in augmenting methane yield,while an excessive substrate loading diminishes methane yield,hampers the kinetics of methane production,and even induces severe process *** study also displayed the variation of the model parameters for the first-order model,the modified Gompertze model,and the transfer function *** the modified Gompertze model and transfer function model exhibited the same environmental stress ***,both the increase in particulate content and the increase in S/I had a substantial effect on the substrate conversion rate to *** analysis demonstrates the dominant influence of Firmicutes and Methanosarcina under different organic loading *** both a kinetic and a microbiological point of view,this work provides novel insights into the fundamental processes that regulate anaerobic digestion(AD)under varying loading ***,it has significant implications for improving the operating efficiency of AD,which is a significant benefit.

关键词： maize straw dry anaerobic digestion methane production microbial characteristics kinetic model

Multi-Scale Mixed Attention Tea Shoot Instance Segmentation Model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-international Journal of Experimental Botany 2024年第2期93卷 261-275页

作者： Dongmei Chen Peipei Cao Lijie Yan Huidong Chen Jia Lin Xin Li Lin Yuan Kaihua Wu School of Automation Hangzhou Dianzi UniversityHangzhou310018China Tea Research institute Chinese Academy of Agriculture SciencesHangzhou310018China School of Information Engineering Zhejiang University of Water Resources and Electric PowerHangzhou310018China

Tea leaf picking is a crucial stage in tea production that directly influences the quality and value of the *** tea-picking machines may compromise the quality of the tea ***-quality teas are often handpicked and need more delicate operations in intelligent picking *** with traditional image processing techniques,deep learning models have stronger feature extraction capabilities,and better generalization and are more suitable for practical tea shoot ***,current research mostly focuses on shoot detection and cannot directly accomplish end-to-end shoot segmentation *** propose a tea shoot instance segmentation model based on multi-scale mixed attention(Mask2FusionNet)using a dataset from the tea garden in *** further analyzed the characteristics of the tea shoot dataset,where the proportion of small to medium-sized targets is 89.9%.Our algorithm is compared with several mainstream object segmentation algorithms,and the results demonstrate that our model achieves an accuracy of 82%in recognizing the tea shoots,showing a better performance compared to other *** ablation experiments,we found that ResNet50,pointRend strategy,and the Feature Pyramid Network(FPN)architecture can improve performance by 1.6%,1.4%,and 2.4%,*** experiments demonstrated that our proposed multi-scale and point selection strategy optimizes the feature extraction capability for overlapping small *** results indicate that the proposed Mask2FusionNet model can perform the shoot segmentation in unstructured environments,realizing the individual distinction of tea shoots,and complete extraction of the shoot edge contours with a segmentation accuracy of 82.0%.The research results can provide algorithmic support for the segmentation and intelligent harvesting of premium tea shoots at different scales.

关键词： Tea shoots attention mechanism multi-scale feature extraction instance segmentation deep learning

Simulation and structural parameter optimization of rotary blade cutting soil based on SPH method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

international Journal of Agricultural and Biological Engineering 2024年第3期17卷 82-90页

作者： Xiongye Zhang Xue Hu Lixin Zhang Abdalla Noureldin Osman Kheiry College of Mechanical and Electrical Engineering Shihezi UniversityShihezi 832000XinjiangChina Bingtuan Energy Development institute Shihezi UniversityShihezi 832000XinjiangChina Xinjiang Production and Construction Corps Key Laboratory of Modern Agricultural Machinery Shihezi 832000XinjiangChina Key Laboratory of Northwest Agricultural Equipment Ministry of Agriculture and Rural AffairsShihezi 832000XinjiangChina College of Agricultural Engineering Sudan University of Science and TechnologyKhartoum 999129Sudan

Pre-sowing mechanical tillage in crop fields is a primary task and important aspect of crop *** interaction between the tillage components and the soil plays a crucial role in determining the energy consumption of tillage ***,it is essential to investigate soil-tool interaction mechanisms and optimize tool design for energy savings in soil *** study employed the Smoothed Particle Hydrodynamics(SPH)method to investigate the soil cutting process of a typical rotary *** article describes the principles and modeling process of the SPH method in *** includes the selection of constitutive models,boundary treatments,and particle conversion.A high-precision soil-tool interaction model was established to analyze the deformation zone of the soil,cutting energy,cutting resistance,and soil particle *** simulation experiments and response surface methodology were used to optimize key design parameters of the rotary blade considering both the reduction in cutting power consumption and the impact on the structural performance of the *** optimal parameters were determined as follows:a bending point included angle of 30°,a side cutting edge bending line direction angle of 51°,and a bending angle of 120°.These parameters resulted in a minimum power consumption of 0.181 kW while meeting the required structural ***,experiments were conducted on field rotary tillage,and the measured power consumption showed a deviation of 7.1%from the simulated power *** optimized power consumption was reduced by 9.52%compared to the initial power consumption,validating the accuracy of the simulation process and the effectiveness of energy savings.

关键词： rotary blade Smoothed Particle Hydrodynamics response surface methodology energy consumption optimization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

经典电路网络中奇异束缚态的实验观察

science Bulletin 2024年第14期69卷 2194-2204页

作者：邹德源陈天孟海瑜 Yee Sin Ang 张向东李庆华 Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements of Ministry of Education Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic SystemsSchool of PhysicsBeijing Institute of TechnologyBeijing 100081China School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Department of Physics National University of SingaporeSingapore 117542Singapore science Mathematics and Technology ClusterSingapore University of Technology and DesignSingapore 487372Singapore Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityFuzhou 350207China

Exceptional bound(EB)states represent a unique new class of robust bound states protected by the defectiveness of non-Hermitian exceptional *** distinct from the more well-known topological states and non-Hermitian skin states,they were recently discovered as a novel source of negative entanglement entropy in the quantum entanglement ***,EB states have been physically elusive,being originally interpreted as negative probability eigenstates of the propagator of nonHermitian Fermi *** this work,we show that EB states are in fact far more ubiquitous,also arising robustly in broad classes of systems whether classical or *** hinges crucially on a newlydiscovered spectral flow that rigorously justifies the EB nature of small candidate lattice *** a highlight,we present their first experimental realization through an electrical circuit,where they manifest as prominent stable resonant voltage *** work brings a hitherto elusive but fundamentally distinctive quantum phenomenon into the realm of classical metamaterials,and provides a novel pathway for the engineering of robust modes in otherwise sensitive systems..

关键词： Exceptional bound states Classical circuit network Non-Hermitian Robustness Exceptional point

A new method for evaluating wedges of steel plates and strips

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research international 2024年第7期31卷 1719-1735页

作者： Xiao-bao Ma Xiao-xin Ma Tao Wang Zhong-kai Ren Yu-cheng Ren College of Mechanical and Vehicle Engineering Taiyuan University of TechnologyTaiyuan 030024ShanxiChina Ministry of Education Engineering Research Center of Advanced Metal Composite Forming Technology and Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina National Key Laboratory of Metal Forming Technology and Heavy Equipment Taiyuan University of TechnologyTaiyuan 030024ShanxiChina china National Heavy Machinery Research institute Co. Ltd.Xi'an 710018ShaanxiChina Faculty of Mechanical Engineering Hebei University of ArchitectureZhangjiakou 075000HebeiChina

To overcome the inaccuracy problem of the traditional wedge evaluation of steel plates and strips caused by the ran-domness of the thicknesses of two local points and improve the reliability of the wedge index,the double-centroid method for the wedge evaluation was proposed,and a model based on the centroid theory was ***,an integral model for the discrete thickness values of the cross-section profiles was *** discussion focused on the distinct characteristics of the two-point method,asymmetric method,and double-centroid method in evaluating the asymmetric distribution of *** three methods were employed to evaluate the wedge values of both the theoretical and measured cross-sections of steel plates and strips,and the accuracies of three wedge evaluation models were analyzed and *** results showed that the double-centroid method objectively reflects the degree and variation characteristics of the wedge values of the cross-sections of steel plates and strips,and this method is feasible,reliable,and outstanding.

关键词： Steel plate and strip Wedge Two-point method Double-centroid method Reliability

大国博弈背景下的印度尼西亚对华关系（英文）

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Contemporary international Relations 2024年第5期 45-65页

作者：骆永昆 the institute of Southeast Asian and Oceanian Studies at china institutes of Contemporary international Relations

In recent years, with the intensification of major-country rivalry and the profound changes in the global geopolitical landscape, Southeast Asia has become a focal point for the world's major countries vying for influence. Since the inauguration of the Biden administration, which inherited its predecessor's “Indo–Pacific” strategy, the United States has spared no effort to woo Southeast Asian countries including Indonesia, pressuring them to take sides. Against such a backdrop, Indonesia has strengthened cooperation with the United States while enhancing relations with china. Based on its traditional “free and active” foreign policy, Indonesia insists on deepening ties with china in spite of pressure from the United States. Given the victory of Prabowo Subianto, currently Indonesian Defense Minister, in the 2024 presidential election, china and Indonesia are expected to maintain the momentum of their friendly cooperation, which will however face strong headwinds such as American interference, tensions in the South china Sea, and changes in Indonesian politics.

关键词：

Ecological Remediation Measures for Non-point Source Pollution Based on Source-Sink Landscape Theory: A Case Study of Huanghou Basin

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Landscape Research 2024年第2期16卷 72-76页

作者： WANG Hao XIAO Shizhen School of Karst science Guizhou Normal University/State Engineering Technology Institute for Karst Desertification ControlGuiyangGuizhou 550001China

The growth of society and population has led to a range of water pollution *** these,non-point source pollution assessment and treatment pose a particular challenge due to its formation *** has become a focal point and challenge in water pollution treatment *** study area for this research was the Huanghou basin in Guizhou Province,southwest *** land use type of the basin was analyzed using remote sensing technology,and water quality data was collected by distributing points throughout the basin,based on source-sink landscape *** distribution map of the basin’s source-sink landscape and the results of water quality data accurately and efficiently identified the areas with high risk of non-point source pollution in the western and southwestern residential and agricultural areas of the upper ***,a strategy of“increasing sinks and decreasing sources”was *** strategy was implemented at both macro and micro levels to address non-point source pollution in the basin using ecological remediation *** work to control karst rocky desertification should continue at a macro *** rocky desertification area in the basin should gradually transform into grassland and forested land,while increasing the overall area of the sink *** restoration techniques,such as slope planting,riparian zone vegetation restoration,increasing plant abundance,and restoring aquatic plants,can effectively control non-point source pollution at the micro *** to traditional control methods,this remediation strategy focuses on source and process *** is more effective and does not require large-scale water pollution control projects,which can save a lot of environmental control funds and management ***,it has greater research significance and application value.

关键词： Source-sink landscape theory Non-point source pollution Ecological restoration Rocky desertification control Karst basin

Effectiveness Analysis on the Physical Activity and the Health Benefit of a Community Population Based Program

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Biomedical and Environmental sciences 2013年第6期26卷 468-473页

作者： JIANG Ying Ying YANG Zheng Xiong NI Rong ZHU You Qun LI Zhi Yu YANG Li Chen ZHAI Yi ZHAO Wen Hua National Center for Chronic and Non-communicable Disease Control and Prevention Chinese Center for Disease Control and Prevention Chinese Center for Disease Control and Prevention international life science institute focal point in china Information Center Health Bureau of Zhejiang Province Health Bureau of Gongshu District Center for Disease Control and Prevention of Gongshu District institute of Nutrition and Food Safety Chinese Center for Disease Control and Prevention

Objective To evaluate the community-based health promotion effect of physical activity. Methods The residents aged 28 and above from two communities in Gongshu District of Hangzhou City, Zhejiang province, were randomly selected and recruited for the multi-strategy and comprehensive physical activity intervention. Questionnaire survey, physical check up and blood biochemistry were conducted. Results After this two-year intervention, the time of the participant spent on weekly physical activity of moderate intensity increased from 464 min to 542 min （P〈0.05）, with an average increase of 78 min. Time spent in walking every week increased from 533 min to 678 min （P〈0.05）, with an average increase of 245 min. The body weight, waistline, blood pressure and heart rate all reduced significantly （P〈0.05）; the vital capacity increased significantly （P〈0.05）; and the related biochemical indicators were also improved. Conclusion Comprehensive and evidence-based physical activity interventions targeting community population can improve the levels of physical activity, related body measurement and biochemical indicators.

关键词： Physical activity Community population Health promotion Walking

Safety and efficacy of a novel responsive neurostimulation system in china for drug-refractory focal epilepsy:The first-in-man study

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2024年第12期137卷 1486-1488页

作者： Kailiang Wang Yongzhi Shan Penghu Wei Liankun Ren Liang Chen Junming Zhu Guoguang Zhao Department of Neurosurgery Xuanwu HospitalCapital Medical UniversityBeijing 100053China international Neuroscience institute(china-INI) Clinical Research Center for EpilepsyCapital Medical UniversityBeijing 100053China china National Medical Center for Neurological Diseases Beijing 100053China Department of Neurology Xuanwu HospitalCapital Medical UniversityBeijing 100053China Department of Neurosurgery Huashan HospitalFudan UniversityShanghai 200032China Department of Neurosurgery The Second Affiliated Hospital of Zhejiang University School of MedicineHangzhouZhejiang 310009China

To the Editor:Recent studies have characterized drugresistant epilepsy(DRE)as essentially a neural network disease.[1]Detection and disconnection of this pathological epileptic connectome or network can greatly improve seizure *** team also proposes the development of the newly emerging branch of epileptic networks neurosurgery(ENN).Responsive neurostimulation(RNS)is an ENN-oriented emerging treatment option without the resection of the seizure-onset zone or epileptic focus and aims to control the seizure or other epileptic manifestations by modulating or disrupting the network’s key nodes(epileptic hubs)in a self-responsive way.

关键词： epilepsy stimulation drug