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设施蔬菜用轨道式多功能喷洒装备的研制

农业装备与车辆工程 2024年第6期62卷 37-41页

作者：刘璇保万奎赵志高赵建忠山东省农业生态与资源保护总站山东济南250131 中国农业科学院农业资源与农业区划研究所北京100081 山东得峰生化科技有限公司山东潍坊262700 山东省农村经济管理服务总站山东济南250013

目前国内设施农业大部分喷施作业都由手动或电动背负式喷雾器完成,存在农药利用率低、人体伤害大和污染环境等弊端,因此设计研发了一种设施蔬菜用轨道式多功能喷洒装备。该喷洒设备通过可固定在温室顶部、地面、侧面的轨道移动,包含稳... 详细信息

目前国内设施农业大部分喷施作业都由手动或电动背负式喷雾器完成,存在农药利用率低、人体伤害大和污染环境等弊端,因此设计研发了一种设施蔬菜用轨道式多功能喷洒装备。该喷洒设备通过可固定在温室顶部、地面、侧面的轨道移动,包含稳定机构、升降台、预热系统等拓展机构。试验结果表明,该设施蔬菜用轨道式多功能喷洒装备喷施的液剂和粉剂的覆盖率分别达到65.31%、67.12%,显著高于背负式喷洒装备的36.52%和47.71%;同样药箱容积下,该喷洒装备的作业时间比背负式喷雾器少23.87%;在施药7天后,该装备的平均防效为90.47%,显著高于背负式喷雾器的84.31%,药剂效果优势显著。研究表明,该设施蔬菜用轨道式多功能喷洒装备具有喷洒范围广、稳定性高、提升药效的特点,可广泛用于设施蔬菜药剂喷施作业。

关键词：设施蔬菜轨道式多功能喷洒装备农业机械化

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通航飞机新能源动力改型设计可行性初探

航空科学技术 2024年第1期35卷 91-96页

作者：李岩谭广琨赵志高张文琦中国航空研究院北京100012 工信(北京)产业发展研究院有限公司北京100041

新一代飞机迫切需要研究的核心技术之一是航空能源转型技术,而降低飞机碳排放的有效途径是发展氢能源动力飞机。本文分析了氢能飞机的推进技术和储存技术,构建了氢能飞机改型设计优化方法,针对某通航飞机利用该方法对不同的能源方案进... 详细信息

新一代飞机迫切需要研究的核心技术之一是航空能源转型技术,而降低飞机碳排放的有效途径是发展氢能源动力飞机。本文分析了氢能飞机的推进技术和储存技术,构建了氢能飞机改型设计优化方法,针对某通航飞机利用该方法对不同的能源方案进行了计算和优化,验证了不同能源动力方案的可行性。进一步对不同的动力装置组合进行了优化对比分析,分析了不同发动机方案带来的重量收益,并给出了不同起飞重量的飞机采用不同能源动力系统的重量,以期为不同类型和用途的飞机选取能源动力方案提供参考。

关键词：氢能飞机重量收益能源动力改型设计优化

Effect of Incoming Vortex on Secondary Flows in Turbine Cascades with Planar and Non-Axisymmetric Endwall

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Journal of Thermal Science 2024年第1期33卷 138-157页

作者： CAO Zhiyuan WANG Chuxuan SONG zhigao GAO Xi zhao Wei LIU Bo School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China National Key Laboratory of Science and Technology on Aerodynamic Design and Research Northwestern Polytechnical UniversityXi'an 710072China Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100080China School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing 100080China

Non-Axisymmetric Endwall Profiling(NAEP) is commonly utilized in turbines to eliminate secondary ***,most of the NAEP methods consider a single-blade row environment without incorporating the effect of the stage *** paper aims to investigate the influence mechanism of the incoming vortex on the endwall secondary flow structures of NAEP in a highly loaded turbine *** model the incoming vortex in a stage environment,this study considers a half-delta wing as the vortex generator at the upstream of the turbine *** NAEP is then carried out for a highly loaded turbine cascade with an in-house numerical optimization design platform subject to no incoming *** simulation is also carried out under the influence of the incoming vortex for the turbine cascades with both planar and non-axisymmetric *** paper furthers investigated the pitchwise effect of the incoming vortex on the near endwall secondary *** results indicate that the NAEP effectively improves the endwall secondary flow of the turbine cascade,where the total pressure loss coefficient and the secondary kinetic energy(SKE) are reduced by 7.3%,and 45.7%,*** is further seen that with the incoming vortex,the NAEP achieves a considerable control effect on the endwall secondary flow of the turbine *** incoming vortex,the NAEP can still achieve considerable control effect on the endwall secondary flow of the turbine cascade;the averaged reductions of loss coefficient and SKE are 7.8% and 14.2%,*** some pitchwise locations,incoming vortex can suppress the convection of cross-passage flow toward the suction corner greatly and reduce the loss coefficient of the baseline *** incoming vortex at 4/7 pitch impinged right at the blade leading edge,leading to the generation of low-momentum fluid,which increased the size and the strength of the horseshoe *** all the pitchwise locations,NAEP can suppress the seco

关键词： non-axisymmetric endwall secondary flow incoming vortex passage vortex stage environment

Modulating the threshold voltage of oxide nanowire field-effect transistors by a Ga^＋ ion beam

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Nano Research 2014年第11期7卷 1691-1698页

作者： Wenqing Li Lei Liao Xiangheng Xiao Xinyue zhao zhigao Dai Shishang Guo Wei Wu Ying Shi Jinxia Xu Feng Ren Changzhong Jiang Department of Physics and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education Wuhan UniversityWuhan 430072 China

In this paper, we report a method to change the threshold voltage of SnO2 and In2O3 nanowire transistors by Ga^＋ ion irradiation. Unlike the results in earlier reports, the threshold voltages of SnO2 and In2O3 nanowire field-effect transistors （FETs） shift in the negative gate voltage direction after Ga^＋ ion irradiation. Smaller threshold voltages, achieved by Ga^＋ ion irradiation, are required for high-performance and low-voltage operation. The threshold voltage shift can be attributed to the degradation of surface defects caused by Ga＋ ion irradiation. After irradiation, the current on/off ratio declines slightly, but is still close to -106. The results indicate that Ga^＋ ion beam irradiation plays a vital role in improving the performance of oxide nanowire FETs.

关键词： nanowire field-effect transistor ion irradiation threshold voltage

Establishment of an indirect immunofluorescence assay for the detection of African swine fever virus antibodies

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Journal of Integrative Agriculture 2024年第1期23卷 228-238页

作者： Wan Wang Zhenjiang Zhang Weldu Tesfagaber Jiwen Zhang Fang Li Encheng Sun Lijie Tang zhigao Bu Yuanmao Zhu Dongming zhao State Key Laboratory for Animal Disease Control and Prevention National African Swine Fever Para-reference LaboratoryNational High Containment Facilities for Animal Diseases Control and PreventionHarbin Veterinary Research InstituteChinese Academy of Agricultural SciencesHarbin 150069China College of Veterinary Medicine Northeast Agricultural UniversityHarbin 150069China

African swine fever(ASF)continues to cause enormous economic loss to the global pig *** there is no safe and effective vaccine,accurate and timely diagnosis of ASF is essential to implement control *** immunofluorescence assay(IFA)is a gold standard serological method recommended by the World Organization for Animal Health(WOAH).In this study,we used primary fetal kidney cells to establish a wild boar cell line(BK2258)that supported the efficient replication of ASF virus(ASFV)SD/DY-I/21 and showed visible cytopathic effect(CPE).Moreover,using BK2258,we established a sensitive and specific IFA for ASFV antibody *** standardize and evaluate the performance of this assay,we used serum samples from pigs infected with the low virulent genotype I SD/DY-I/21 and genotype II HLJ/HRB1/20,and immunized with the vaccine candidate HLJ/18-7GD,field samples,and negative serum *** IFA reacted with the ASFV-positive sera and displayed bright fluorescence *** was no non-specific green fluorescence due to cellular senescence or other cell damage-causing *** to a commercial indirect enzyme-linked immunosorbent assay(iELISA),ASFV antibodies were detected 1–4 days earlier using our *** detection limits of the IFA and iELISA for the same ASFV-antibody positive serum samples were 1:25,600 and 1:6,400,respectively,indicating that the IFA is more sensitive than *** newly established IFA was highly specific and did not cross-react with sera positive for six other important porcine pathogens(i.e.,Classical swine fever virus(CSFV),Porcine reproductive and respiratory syndrome virus(PRRSV),Porcme circovirus type 2(PCV2),Pseudorabies virus(PRV),Foot-and-Mouth disease virus type O(FMDV/O),and Porcine epidemic diarrhea virus(PEDV)).This study thus provides a sensitive,specific,and reliable detection method that is suitable for the serological diagnosis of ASF.

关键词： African swine fever antibody IFA serological method

Effects of prebiotics on the fermentation of traditional suancai of Northeast China

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Food Science and Human Wellness 2024年第3期13卷 1358-1367页

作者： Mingwei zhao Xinying Cao Yuzheng Wu Sibo Zou zhigao Li Xinping Lin Chaofan Ji Liang Dong Sufang Zhang Chenxu Yu Huipeng Liang National Engineering Research Center of Seafood Collaborative Innovation Center of Provincial and Ministerial Co-construction for Deep ProcessingCollaborative Innovation Center of Seafood Deep ProcessingSchool of Food Science and TechnologyDalian Polytechnic UniversityDalian 116034China Department of Agricultural and Biosystems Engineering Iowa State UniversityIA 50011USA

Suancai is a traditional fermented vegetable widely consumed in Northeast *** this study,different prebiotics were used to improve the quality of *** prebiotics(inulin(INU),xylooligosaccharide(XO S),galactooligosaccharide(GOS),and stachyose(STA))were shown to reduce the pH value and increase the content of total titratable acidity(TTA)in suancai,while the contents of most organic acids were also *** addition of prebiotics had significant effects on the bacterial microbiota during the suancai fermentation *** prebiotics were shown to contribute to the growth of *** suancai sample with fructooligosaccharides(FOS)had the highest relative abundance of ***,INU and XOS could increase the abundance of *** evaluate the quality of suancai fermented with prebiotics,profiles of volatile flavor compounds(VOCs)and free amino acids(FAA)were *** prebiotics affected the VOCs and FAA profiles via transforming the bacterial *** addition,the addition of prebiotics also changed the taste profiles of the suancai *** study is among the first attempts to reveal the effects of different prebiotics on suancai fermentation,and the findings provide a foundation to develop new ways for improving the quality of suancai.

关键词： Bacterial microbiota Lactic acid bacteria Flavor Amino acid Taste

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单向纤维复合材料声学超表面

复合材料学报 2022年第7期39卷 3339-3346页

作者：王真赵志高尹雪琴武汉纺织大学机械工程与自动化学院武汉430200 武汉第二船舶设计研究所武汉430205

声学超表面是一种能够调节声波反射、透射和吸收特性的超薄人工结构,对于空间受限的应用领域具有重要价值,目前声学超表面主要借助超构材料来实现。提出一种非超构材料的新型声学超表面,采用单向纤维周期复合材料对声波进行调制,实现了... 详细信息

声学超表面是一种能够调节声波反射、透射和吸收特性的超薄人工结构,对于空间受限的应用领域具有重要价值,目前声学超表面主要借助超构材料来实现。提出一种非超构材料的新型声学超表面,采用单向纤维周期复合材料对声波进行调制,实现了声波的定向反射调控。借助复合材料细观力学方法,采用均匀化理论和优化方法设计周期复合材料单胞的组分,使单胞具有特定的等效力学性能与声学性能,并满足特性阻抗匹配,从而形成超表面所需的声速梯度分布。通过能带分析获得了单胞纵波波速与频率的关系,显示出复合材料超表面的宽频特性。定向反射仿真展示了复合材料超表面操控声波的有效性,并验证了对于垂直入射声波纵波是影响波控性能的主要因素。研究工作为声学超表面及其他声学波控装置的设计提供了一种新途径。

关键词：声学超表面周期复合材料单胞能带结构均匀化方法单向纤维复合材料

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五模声学超表面分段设计及其波控性能分析

华中科技大学学报（自然科学版） 2022年第5期50卷 19-25页

作者：王真尹雪琴赵志高沈敏武汉纺织大学机械工程与自动化学院湖北武汉430200 武汉纺织大学湖北省数字化纺织装备重点实验室湖北武汉430200 武汉第二船舶设计研究所湖北武汉430205

为拓宽五模微结构可实现的等效物性参数范围,提出采用两种基材对超表面分段设计的方法.在五模超表面理论推导的基础上,以Norris提出的微结构为基本构型,采用均匀化理论计算微结构的等效模量矩阵,对微结构几何参数进行优化设计,获得了具... 详细信息

为拓宽五模微结构可实现的等效物性参数范围,提出采用两种基材对超表面分段设计的方法.在五模超表面理论推导的基础上,以Norris提出的微结构为基本构型,采用均匀化理论计算微结构的等效模量矩阵,对微结构几何参数进行优化设计,获得了具有铝和钛合金两段基材的反射式声学超表面.结合能带分析和定向反射仿真实验,分析了微结构声学特性及其对超表面波控性能的影响,仿真结果表明:具有两种基材的超表面能够实现较宽的模量和密度分布,从而保证所需声速梯度,仿真结果验证了方法的可行性和有效性.本方法为五模超材料设计提供了一种新途径,对于大空间或大角度的声波调控具有重要的工程应用价值.

关键词：声学超表面五模超构材料微结构能带分析均匀化

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全柔性浮筏隔振系统建模与隔振性能分析

振动．测试与诊断 2017年第1期37卷 70-75页

作者：王真赵志高刘芳武汉纺织大学机械工程与自动化学院武汉430200 武汉第二船舶设计研究所武汉430205

建立了一种包含设备、隔振器、筏架和基础的全柔性浮筏隔振系统的动力学模型。首先,将设备自由振速引入到浮筏隔振系统建模中,提高了模型精度;然后,利用四端参数模型的思想,将筏架的点到点导纳矩阵表示为四端参数网络模型;最后,采用阻... 详细信息

建立了一种包含设备、隔振器、筏架和基础的全柔性浮筏隔振系统的动力学模型。首先,将设备自由振速引入到浮筏隔振系统建模中,提高了模型精度;然后,利用四端参数模型的思想,将筏架的点到点导纳矩阵表示为四端参数网络模型;最后,采用阻抗综合法完成总系统动力学方程,该模型简洁且通用性强。通过数值算例验证了本模型的正确性和有效性,并分别讨论了筏架刚性与柔性以及隔振器参数对隔振效果的影响。所提出的方法对浮筏系统隔振效果的工程计算和设计具有较为重要的理论价值。

关键词：浮筏隔振柔性自由振速四端参数阻抗综合振级落差