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Accelerated biodegradation of iron-based implants via tantalum-implanted surface nanostructures

Bioactive Materials 2022年第3期7卷 239-250页

作者： Min-Kyu Lee Hyun Lee Cheonil Park In-Gu Kang Jinyoung Kim Hyoun-ee Kim Hyun-Do Jung Tae-Sik Jang Department of Materials Science and Engineering Seoul National UniversitySeoul08826Republic of Korea Querrey Simpson Institute for Bioelectronics Northwestern UniversityEvanstonIL60208USA Department of Biomedical-Chemical Engineering Catholic University of KoreaBucheon14662Republic of Korea Department of Biotechnology The Catholic University of KoreaBucheon14662Republic of Korea Department of Materials Science and Engineering Chosun UniversityGwangju61452Republic of Korea

In recent years,pure iron(Fe)has attracted significant attention as a promising biodegradable orthopedic implant material due to its excellent mechanical and biological ***,in physiological conditions,Fe has an extremely slow degradation rate with localized and irregular degradation,which is problematic for practical *** this study,we developed a novel combination of a nanostructured surface topography and galvanic reaction to achieve uniform and accelerated degradation of an Fe *** target-ion induced plasma sputtering(TIPS)technique was applied on the Fe implant to introduce biologically compatible and electrochemically noble tantalum(Ta)onto its surface and develop surface nano-galvanic *** tests revealed that the uniformly distributed nano-galvanic corrosion cells of the TIPS-treated sample(nano Ta-Fe)led to relatively uniform and accelerated surface degradation compared to that of bare ***,the mechanical properties of nano Ta-Fe remained almost constant during a long-term in vitro immersion test(~40 weeks).Biocompatibility was also assessed on surfaces of bare Fe and nano Ta-Fe using in vitro osteoblast responses through direct and indirect contact assays and an in vivo rabbit femur medullary cavity implantation *** results revealed that nano Ta-Fe not only enhanced cell adhesion and spreading on its surface,but also exhibited no signs of cellular or tissue *** results demonstrate the immense potential of Ta-implanted surface nanostructures as an effective solution for the practical application of Fe-based orthopedic implants,ensuring long-term biosafety and clinical efficacy.

关键词： Iron Tantalum Ion implantation Biodegradation Orthopedic implants

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Novel Farming Innovation for High Production of Black Pepper （Piper nigrum L.） Planting Materials

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Journal of Agricultural Science and Technology(B) 2017年第5期7卷 301-308页

作者： Kho Pei ee Chen Yi Shang Malaysian Pepper Board Jalan Utama Pending Industrial Area P.O. Box 1653 Kuching Sarawak 93916 Malaysia

In accordance to National Commodity Policy （2011-2020）, Malaysian government targets at expending the pepper cultivated area from the current 16,331 ha to 20,110 ha by year 2020. Based on a planting density of 2,000 vines/ha, there will be an urgent need of 7.588 million cuttings for the next five years in order to achieve this target. However, shortages of planting materials, low productivity and occurrence of pests and diseases remain as the major challenge of pepper industry nowadays. Therefore, a novel farming innovation, namely W-configuration cultivation method has been developed to ensure high production of planting materials for large-scale pepper cultivation and at the same time to maximize land use in pepper farm. A field evaluation was conducted to compare the cutting production among W-configuration, V-configuration and traditional cultivation method. W-configuration recorded the highest mean number of pepper cuttings produced with 11.97 cuttings per vine in every pruning cycle, or equivalent to 71% of increment as compared to 7.00 cuttings per vine produced from the traditional planting method. Meanwhile, V-configuration produced 8.91 of mean cuttings, which are significantly lower than those produced by W-configuration method and yet comparable to traditional method. Based on return on investment （ROI） analysis, implementation of W-configuration cultivation method was able to achieve 35% of return per cycle of planting within two years for the first cycle and upsurged to approximately 355% for the subsequence cycle. Furthermore, this novel innovation also out-yielded traditional planting method by 75.27% for the first and second year of green berry production. The ROI analysis proved the feasibility of this newly developed cultivation method to create potential new income for pepper smallholders in Malaysia, who traditionally cultivate pepper for its peppercorn production. This study also enlightened the thorough planting procedures of W-configuration

关键词： Black pepper W-configuration pepper cuttings return on investment.

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用于软件评估和选择的探试程序

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软件 1990年第2期11卷 101-110页

作者： Ande.,ee 强力

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The Theory of Adaptation of the Nervous System

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Journal of Systems Engineering and Electronics 1992年第2期3卷 1-12页

作者： Cai YifaSchool of Information Systems, Kingston University, Surrey KT12ee, U.K. School of Information Systems Kingston University Surrey KTI 2EE U.K.

The explanation and simulation of the natural and artificial intelligence are the central goals of the studies of Neuroscience, Psychology, Artificial Intelligence and Cognitive Science. This paper first gives an introduction to the core topics and approaches in the study. Then, GAF--a general adaptive framework for neural system is proposed. Interdisciplinary discussions around the adaptation of the human nervous system are presented. Rules describing the theory of adaptation of the nervous system are provided.

关键词： Nervous system Artificial intelligence General adaptive framework.

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Harnessing the Beneficial Attributes of Ceria and Titania in a Mixed-Oxide Support for Nickel-Catalyzed Photothermal CO_2 Methanation

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Engineering 2017年第3期3卷 393-401页

作者： ee Teng Kho Salina Jantarang Zhaoke Zheng Jason Scott Rose Amal Particles and Catalysis Research Laboratory School of Chemical Sciences and Engineering The University of New South Wales Sydney NSW 2052 Australia

Solar-powered carbon dioxide （CO_2）-to-fuel conversion presents itself as an ideal solution for both CO_2 mit- igation and the rapidly growing world energy demand. In this work, the heating effect of light irradiation onto a bed of supported nickel （Ni） catalyst was utilized to facilitate CO_2 conversion. Ceria （CeO_2）-titania （TiO_2） oxide supports of different compositions were employed and their effects on photothermal CO_2 conver- sion examined, Two factors are shown to be crucial for instigating photothermal CO_2 methanation activity： ① Fine nickel deposits are required for both higher active catalyst area and greater light absorption capacity for the initial heating of the catalyst bed; and ② the presence of defect sites on the support are necessary to promote adsorption of C02 for its subsequent activation, Titania inclusion within the support plays a crucial role in maintaining the oxygen vacancy defect sites on the （titanium-doped） cerium oxide. The combination of elevated light absorption and stabilized reduced states for CO_2 adsorption subsequently invokes effective Dhotothermal CO_2 methanation when the ceria and titania are blended in the ideal ratio（s）.

关键词： Photothermal CO_2 reduction Nickel Ceria Titania

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Acute Cholecystitis: Computed Tomography (CT) versus Ultrasound (US)

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Open Journal of Radiology 2018年第2期8卷 131-139页

作者： ee Syn Tan Jason Friesen Brendon Friesen Department of General Surgery Monash Health Dandenong Hospital Dandenong Australia Royal Brisbane and Women’s Hospital University of Queensland Brisbane Australia Lake Imaging St. John of God Geelong Australia

Acute cholecystitis is a common surgical emergency and ultrasound (US) is currently considered the first-line diagnostic imaging test. The relative accuracy of computed tomography (CT) in detecting acute cholecystitis has received little attention in the literature. We report a case series of 113 patients who underwent emergency laparoscopic cholecystectomy at a tertiary surgical centre in Australia, between 2014 and 2016, after undergoing both US and CT examination for acute right upper quadrant pain. Both US and CT had a relatively low sensitivity in detecting acute cholecystitis in the patients with histologically proven acute cholecystitis (47% and 45% respectively) but high specificity (84% and 79% respectively). As expected, US was much more sensitive in detecting cholelithiasis (92%) in comparison to CT (55%). With the added advantage of CT in excluding other alternative intra-abdominal pathology in patients presenting with acute right upper quadrant pain, and similar accuracy in detecting acute cholecystitis, the need for ultrasound may be negated in cases where acute cholecystitis has been confirmed on CT. However, it is noted that both US and CT had a significant false negative rate for acute cholecystitis, and if there remains a clinical suspicion despite initial normal imaging, repeat delayed imaging and/or surgical opinion may be warranted.

关键词： Acute Cholecystitis Ultrasound Computed Tomography Gallbladder Disease

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Baseband Distortion Modeling for a Parametric Loudspeaker System Using Volterra Kernels

Baseband Distortion Modeling for a Parametric Loudspeaker Sy...

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2011年亚太信号与信息处理协会年会

作者： ee-leng Tan Woon-Seng Gan Digital Signal Processing Laboratory School of Electrical and Electronic Engineering Nanyang Technological University Singapore

A directional sound beam can be generated by a parametric loudspeaker system through the nonlinear interaction between finite-amplitude ultrasonic waves in air. However, this nonlinear interaction also produces harmonic components in addition to the desired audible sound. In order to investigate this nonlinear phenomenon, a baseband distortion model is developed from nonlinear system identification using Volterra kernels along with results obtained from both numerical simulations and experimental measurements that take into account the emitter’s response. A nonlinear model with reduced complexity to the 2nd-order Volterra kernel is found to agree with the mathematical model. Based on this model, we can predict the total harmonic distortion （THD） in the far field and perform predistortion technique to remove it.

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利益相关者对食品安全可追溯系统的影响研究

利益相关者对食品安全可追溯系统的影响研究

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作者： Yap Chai ee 华东师范大学

学位级别：硕士

近年来的食品丑闻事件让人们越来越关注食品安全和质量问题,使食品安全成为世界各国重点关注的课题。针对日益严峻的食品安全问题,各国已制定出食品安全和质量管理的法律、政策和标准。而可追溯性也被认为是满足食品安全和质量要求的工... 详细信息

近年来的食品丑闻事件让人们越来越关注食品安全和质量问题,使食品安全成为世界各国重点关注的课题。针对日益严峻的食品安全问题,各国已制定出食品安全和质量管理的法律、政策和标准。而可追溯性也被认为是满足食品安全和质量要求的工具,不仅可以改善食品链中的安全性,还可增加消费者的信心,连接生产者和消费者,被认为是一个有效的安全和质量监测系统。然而,虽然食品安全可追溯系统可为零售终端的食品安全质量保证,但由于各种因素导致企业实施可追溯系统的积极性受到影响。对于可追溯系统现有研究,主要以某种可追溯技术针对某种类品进行追溯和溯源研究以及不同流通阶段利用不同技术的研究。目前在食品安全可追溯系统同时针对所有利益相关者的研究并不多,以企业角度研究利益相关者对可追溯技术选择与可追溯层次选择影响的研究也很少。本文以主营生鲜产品、速冻食品和休闲食品的企业为研究对象。首先,分析利益相关者在企业进行实施可追溯系统时对可追溯技术选择与可追溯层次选择的影响。后将供应链伙伴关系作为调节变量引入模型,探究企业与供应链伙伴关系不同程度下在利益相关者与可追溯技术选择及可追溯层次选择之间造成的影响。本研究通过问卷调查获得实证数据,运用SPSS 25.0和Amos 20.0进行数据分析,对本研究提出的假设进行验证。研究结果显示:认知水平、支付意愿、支持措施、监管政策和媒体关注度对可追溯技术选择和可追溯层次选择都有显著的正向影响。供应链伙伴关系在认知水平、支付意愿和支持措施与可追溯技术及层次选择之间的关系有着显著的正向调节作用;但供应链伙伴关系只在监管政策与可追溯技术选择之间的关系在有着显著的正向调节作用,在与可追溯层次选择之间的关系没有显著影响。基于以上结果,本文提出了促进企业实施食品安全可追溯系统的对策建议。

关键词：食品安全可追溯技术可追溯层次利益相关者

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文化遗产旅游促进联合国2030年可持续发展目标的路径

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旅游学刊 2023年第8期38卷 3-5页

作者： Chin ee Ong 张朝枝中山大学旅游学院广东广州510275

2015年,联合国大会通过了《2030年可持续发展议程》和17个可持续发展目标(Sustainable Development Goals,SDGs),为全球可持续发展勾勒了一幅美好的愿景。这也是全球范围内国际发展议程中首次将文化作为可持续发展目标之一,在优质教育... 详细信息

2015年,联合国大会通过了《2030年可持续发展议程》和17个可持续发展目标(Sustainable Development Goals,SDGs),为全球可持续发展勾勒了一幅美好的愿景。这也是全球范围内国际发展议程中首次将文化作为可持续发展目标之一,在优质教育、可持续城镇、环境、经济增长、负责任消费和生产、公正和谐和包容社会、性别平等以及粮食安全等大多数可持续发展目标中均对文化的角色有所体现,这是国际发展议程中首次提及文化,并被联合国教科文组织视为“无与伦比的认可”。

关键词：文化遗产旅游可持续发展目标全球可持续发展粮食安全联合国教科文组织全球范围优质教育公正和谐

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一种计算机辅助设计数据文本服务程序的设计和实现

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软件 1989年第9期10卷 665-684页

作者： Chan.,ee 邵惠玲

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