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Development of a mobile powered hole digger for orchard tree cultivation using a slider-crank feed mechanism

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International Journal of Agricultural and Biological Engineering 2016年第3期9卷 48-56页

作者： Zong Wangyuan Wang Jingliang Huang Xiaomao Yu dong Zhao Yingbiao sean Graham College of Engineering Huazhong Agricultural UniversityWuhan 430070China Department of Agricultural and Biosystems Engineering Iowa State UniversityAmesIA 50011USA

The powered hole digger is one of the most important orchard *** power consumption of its drill is an important factor affecting the performance and operation of the *** drill power consumption of the digger at a constant feed rate is directly proportional to digging *** research discusses a newly designed powered hole digger using a slider-crank feed *** motion characteristics of the powered hole digger feeding mechanism was ***,an experiment was conducted to determine the characteristics of the drill power *** can be concluded that there was a positive correlation between the drill power consumption and the powered hole digger feed *** was observed that when digging depth reached 200 mm,the drill power consumption reached the maximum power rating;subsequently the drill power consumption decreased with an increase of digging *** the drill reached the bottom of the hole,the power consumption of the new powered hole digger did not exceed the maximum designed power rating,hence the drill motor would not stall.

关键词： powered hole digger crank-slider drill power consumption orchard tree

Flexible thin-film acoustic wave devices with off-axis bending characteristics for multisensing applications

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Microsystems & Nanoengineering 2021年第6期7卷 151-159页

作者： Zhangbin Ji Jian Zhou Huamao Lin Jianhui Wu Dinghong Zhang sean Garner Alex Gu Shurong dong YongQing Fu Huigao Duan College of Mechanical and Vehicle Engineering Hunan University410082 ChangshaChina Shanghai IndustrialμTechnology Research Institute(SITRI) 235 Chengbei Rd201800 ShanghaiChina Corning Research&Development Corporation One River Front PlazaNewarkNY 14831USA College of Information Science and Electronic Engineering Zhejiang University310027 HangzhouChina Faculty of Engineering and Environment Northumbria UniversityNewcastle upon Tyne NE18STUK

Flexible surface acoustic wave(SAW)devices have recently attracted tremendous attention for their widespread application in sensing and ***,for these applications,SAW devices often need to be bent into offaxis deformations between the acoustic wave propagation direction and bending ***,there are few studies on this topic,and the bending mechanisms during off-axis bending deformations have remained unexplored for multisensing ***,we fabricated aluminum nitride(AlN)flexible SAW devices by using high-quality AlN films deposited on flexible glass substrates and systematically investigated their complex deformation behaviors.A theoretical model was first developed using coupling wave equations and the boundary condition method to analyze the characteristics of the device with bending and off-axis deformation under elastic *** relationships between the frequency shifts of the SAW device and the bending strain and off-axis angle were obtained,and the results were identical to those from the theoretical ***,we performed proof-of-concept demonstrations of its multisensing potential by monitoring human wrist movements at various off-axis angles and detecting UV light intensities on a curved surface,thus paving the way for the application of versatile flexible electronics.

关键词： bending wave characteristics

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扫描电化学显微镜在光电能源研究领域的应用

化学进展 2016年第6期28卷 908-916页

作者：何辉超 sean P.Berglund C.Buddie Mullins 周勇柯改利董发勤西南科技大学材料科学与工程学院四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地固体废物处理与资源化教育部重点实验室绵阳621010 美国德克萨斯大学奥斯汀分校化学化工系奥斯汀78712 广东矿物物理与材料研究开发重点实验室广州510460 南京大学物理学院南京211102

作为一种扫描探针技术,扫描电化学显微镜(SECM)在金属防腐、材料表征、生物医学和新能源技术等领域的研究中扮演着重要角色。本文简要介绍了SECM的基本工作原理和常用的两种工作模式:反馈模式和收集/产生模式;综述了SECM在太阳能电池和... 详细信息

作为一种扫描探针技术,扫描电化学显微镜(SECM)在金属防腐、材料表征、生物医学和新能源技术等领域的研究中扮演着重要角色。本文简要介绍了SECM的基本工作原理和常用的两种工作模式:反馈模式和收集/产生模式;综述了SECM在太阳能电池和太阳光解水制氢两个光电能源研究领域的应用进展,同时结合课题组的工作基础,特别是近期利用SECM筛选合适金属离子掺杂改性WO3光阳极的工作,对SECM在筛选半导体电极材料方面的应用特点进行了实例展示介绍,最后简要总结了SECM在光电能源研究领域的发展及方向。

关键词：扫描电化学显微镜光电能源应用

Characterization of α-conotoxin TxIB and TxID for smoking cessation and drug rehabilitation

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中国药理学与毒理学杂志 2018年第9期32卷 711-713页

作者： ZHANGSUN dong-ting ZHU Xiao-peng ZHANGSUN Man-qi WU Yong LI Xiao-dan sean CHRISTENSEN Quentin KAAS Peta J HARVEY David J CRAIK J Michael MCINTOSH LUO Su-lan Key Laboratory of Tropical Biological Resources of Ministry of Education Key Lab for Marine Drug of Haikou Hainan University Haikou570228 China Departments of Biology and Psychiatry University of Utah Salt Lake City Utah 84112 USA Instit

Nicotinic acetylcholine receptors(nAChRs) are widely distributed ligand gated ion channels throughout the peripheral and central nervous systems of *** are 16 different n AChR subunits,α1-α7,α9,α10 and β1-β4,as well as γ,δ,and ε,which assemble into pentamers to form different nAChR subtypes with distinct pharmacological properties in *** them α6β2*(*designates other possible subunit),α3β4 and α4β2 nAChR subtypes are potential therapeutic targets for the treatment of ***,various n AChR subtypes are very difficult to pharmacologically distinguish from each *** α6* n AChRs are expressed by dopaminergic neurons in the central nervous system,which modulate the release of dopamine and are believed to be important in mediating tobacco,morphine,cocaine and ethanol *** α3β4 nAChRs present in the medial habenula with important role in influencing nicotine *** of α3β4 nAChRs in the medial habenula decreased the dose of nicotine that rodents would ***,new antagonists of α6β2* or α3β4 nA ChR subtypes are of considerable interest,which would give strategies to selectively modulate α6β2* or α3β4 nA ChR *** characterized an α-conotoxin(α-CTx)TxIB with 16 amino acids and an α-CTx TxID with 15 amino acids from Conus *** sequence of TxIB is *** sequence of TxID is GCCSHPVCSAMSPIC with C-terminal amidation *** peptides with a Ⅰ-Ⅲ and Ⅱ-Ⅳ disulfide con-nectivity were chemically *** residues between Cys-Ⅱ and Cys-Ⅲ and Cys-Ⅲand Cys-Ⅳ of α-CTx are commonly referred to as loops 1 and 2,*** number of residues in each of these loops is used to further classify the α-*** TxIB is classified as a 4/7α-CTx,whereas the α-CTx TxIB has a 4/6 *** peptides were tested on rat nAChRs heterologously expressed in Xenopus laevis *** α-CTx TxIB blocked α6/α3β2β3 nAChR with an IC50 of 28 nmol·L^(-1),which showed little or no block of all th

关键词： acetylcholine receptors smokingcessation drug rehabilitation α-conotoxins

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姜黄素抗人巨细胞病毒感染的体外实验研究

生物医学工程学杂志 2022年第6期39卷 1158-1164页

作者：丁香岳冀蓉董碧蓉冷晓四川大学华西医院老年医学中心成都610041 约翰斯·霍普金斯医院老年科约翰斯·霍普金斯老年与免疫重建中心美国马里兰州21224

本文旨在探讨姜黄素(Cur)体外抗人巨细胞病毒(HCMV)的作用。通过体外培养人胚肺成纤维细胞,采用四唑盐(MTS)方法检测Cur对细胞活力的影响。本研究分为对照组、HCMV组、HCMV+膦甲酸钠(PFA)组和HCMV+Cur组,通过蚀斑实验观察各组细胞病变效... 详细信息

本文旨在探讨姜黄素(Cur)体外抗人巨细胞病毒(HCMV)的作用。通过体外培养人胚肺成纤维细胞,采用四唑盐(MTS)方法检测Cur对细胞活力的影响。本研究分为对照组、HCMV组、HCMV+膦甲酸钠(PFA)组和HCMV+Cur组,通过蚀斑实验观察各组细胞病变效应(CPE),采用定量聚合酶链式反应(qPCR)检测各组HCMV的DNA拷贝数,蛋白免疫印迹检测HCMV不同时序蛋白的表达情况。结果发现,在细胞毒性实验中,与对照孔相比,当Cur浓度小于等于15μmol/L时,Cur对细胞生长和活力没有明显影响(P>0.05)。HCMV感染细胞5 d后,细胞开始出现CPE,随着时间延长,蚀斑数量增加。Cur可以减少CPE的产生,且呈剂量依赖性。HCMV感染细胞后,其DNA拷贝数和蛋白表达量逐渐增多,呈时间依赖性;Cur能够显著抑制HCMV的DNA复制,并下调HCMV蛋白表达水平,呈浓度依赖性,差异具有统计学意义(P<0.05)。综上,Cur通过抑制HCMV的DNA的复制和下调HCMV不同时序蛋白表达水平从而发挥抗HCMV活性。本研究为抗HCMV感染药物的研发提供新的实验依据。

关键词：人巨细胞病毒姜黄素体外实验

Transaction Frequency Based Trust for E-Commerce

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Computers, Materials & Continua 2023年第3期 5319-5329页

作者： dong Huang sean Xu School of Applied Foreign Languages Zhejiang Yuexiu UniversityShaoxing312000China Anzina PTY Ltd. SydneyNSW2118Australia

Most traditional trust computing models in E-commerce do not take the transaction frequency among participating entities into consideration,which makes it easy for one party of the transaction to obtain a high trust value in a short time,and brings many disadvantages,uncertainties and even *** solve this problem,a transaction frequency based trust is proposed in this *** proposed method is composed of two *** first part is built on the classic Bayes analysis based trust modelswhich are ease of computing for the E-commerce *** second part is the transaction frequency module which can mitigate the potential insecurity caused by one participating entity gaining trust in a short *** show that the proposed method can effectively mitigate the self-promoting attacks so as to maintain the function of E-commerce system.

关键词： Transaction frequency trust Bayes analysis E-commerce

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差分隐私保护参数ε的选取研究

通信学报 2015年第12期36卷 124-130页

作者：何贤芒王晓阳陈华辉董一鸿宁波大学信息科学与工程学院浙江宁波315211 复旦大学计算机科学技术学院上海数据科学重点实验室上海201203

2006年,差分隐私保护作为一种新的隐私保护范式出现,因其不需要攻击者先验知识的假设,而被认为是一种非常可靠的保护机制。然而,作为隐私保护技术的主要参数ε的意义对于一般用户而言不十分明确。鉴于此,提出一个新的攻击模型,可以用来... 详细信息

2006年,差分隐私保护作为一种新的隐私保护范式出现,因其不需要攻击者先验知识的假设,而被认为是一种非常可靠的保护机制。然而,作为隐私保护技术的主要参数ε的意义对于一般用户而言不十分明确。鉴于此,提出一个新的攻击模型,可以用来选取参数ε的值。详细分析了该攻击模型的特点,通过理论证明和模型的实证分析,最后给出了一个参数ε的选取计算式。

关键词：差分隐私攻击模型数据隐私

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骨缝牵引成骨动物模型的建立及应用

组织工程与重建外科杂志 2015年第1期11卷 14-18页

作者：李东黄晓翔 sean Shih-Yao Liu 徐海淞曹德君柴岗韦敏上海交通大学医学院附属第九人民医院整复外科上海市200011 美国印第安纳大学口腔颌面及正畸遗传学部

目的建立兔颅骨矢状缝牵引成骨的动物实验模型,评价该模型的可行性,并探讨局部应用rhBMP-2对牵引成骨的作用。方法以微型牵引种植钉(Miniscrew implants,MSI)作支抗,镍钛弹簧为牵引力源,建立MSI兔颅骨矢状缝弹力牵引成骨模型。应用该牵... 详细信息

目的建立兔颅骨矢状缝牵引成骨的动物实验模型,评价该模型的可行性,并探讨局部应用rhBMP-2对牵引成骨的作用。方法以微型牵引种植钉(Miniscrew implants,MSI)作支抗,镍钛弹簧为牵引力源,建立MSI兔颅骨矢状缝弹力牵引成骨模型。应用该牵引系统对11周龄的新西兰白兔作矢状缝牵引成骨。将动物随机分为实验组(牵引+rh BMP-2,n=7),对照组(单纯牵引,n=7)。牵引29天,于0、5、11、17、23及29 d,应用X线及Micro-CT评价骨缝牵开情况;第7、27天注射四环素,第17天注射钙黄绿素,作为术后荧光组织切片观察标记。观察动物对该牵引成骨系统的耐受性,比较各组骨缝牵开的距离,并观察矢状缝组织形态学变化,验证兔颅骨矢状缝牵引成骨模型的可行性。结果MSI弹力牵引系统成功率为86%,牵引成骨实验可顺利完成。对照组矢状缝牵开的距离大于实验组(D29),两组矢状缝牵开的距离随着牵引持续时间的增加而递增,但骨缝牵开呈现先快后慢的趋势。骨组织形态学显示,两组骨缝间均有新生骨组织形成,说明该牵引成骨模型既能有效牵开骨缝,也能诱导骨缝间成骨。而实验组骨缝间新生骨组织形成速度大于对照组。结论本实验采用自行研制的微型种植钉MSI弹力牵引系统,成功建立了兔矢状缝弹力牵引成骨模型。骨缝牵引过程中,局部应用rhBMP-2可促进骨缝成骨,但导致了骨缝融合。

关键词：动物模型微型牵引种植钉重组人骨形态发生蛋白-2 骨缝牵引成骨

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某含金硫精矿焙烧制酸净化工序优化改造

硫酸工业 2023年第4期 32-35页

作者：孙晋琳董彬王余涛曹鸿志云南黄金矿业集团股份有限公司云南昆明650299

介绍了某160 kt/a含金硫精矿焙烧制酸装置净化工序运行过程中存在的问题及优化改造情况。该制酸装置采用的含金硫精矿由原矿通过浮选后获得,矿物性质复杂且粒度较小,易造成除尘和净化工序设备堵塞、腐蚀老化。该制酸装置净化工序经过长... 详细信息

介绍了某160 kt/a含金硫精矿焙烧制酸装置净化工序运行过程中存在的问题及优化改造情况。该制酸装置采用的含金硫精矿由原矿通过浮选后获得,矿物性质复杂且粒度较小,易造成除尘和净化工序设备堵塞、腐蚀老化。该制酸装置净化工序经过长期运行,存在运行情况差、设备及管道易积酸泥导致系统阻力大、废酸排放工艺参数不稳定等问题,通过采用“动力波洗涤器+填料塔+电除雾器”酸洗净化流程、增设西恩过滤器、将塑料电除雾器改为玻璃钢电除雾器对净化工序进行改造,提高了烟气净化效果,降低了设备故障率,减小了环保压力,保障了硫酸装置长期稳定运行,提高了企业的经济效益。

关键词：硫酸生产含金硫精矿焙烧净化工序优化改造