In recent years,the emergence of nanotechnology experienced incredible development in the field of medical sciences.During the past decade,investigating the characteristics of nanoparticles during fluid flow has been ...In recent years,the emergence of nanotechnology experienced incredible development in the field of medical sciences.During the past decade,investigating the characteristics of nanoparticles during fluid flow has been one of the intriguing issues.Nanoparticle distribution and uniformity have emerged as substantial criteria in both medical and engineering applications.Adverse effects of chemotherapy on healthy tissues are known to be a significant concern during cancer therapy.A novel treatment method of magnetic drug targeting(MDT)has emerged as a promising topical cancer treatment along with some attractive advantages of improving efficacy,fewer side effects,and reduce drug dose.During magnetic drug targeting,the appropriate movement of nanoparticles(magnetic)as carriers is essential for the therapeutic process in the blood clot removal,infection treatment,and tumor cell treatment.In this study,we have numerically investigated the behavior of an unsteady blood flowinfused with magnetic nanoparticles during MDT under the influence of a uniform external magnetic field in a microtube.An optimal homotopy asymptotic method(OHAM)is employed to compute the governing equation for unsteady electromagnetohydrodynamics flow.The influence of Hartmann number(Ha),particle mass parameter(G),particle concentration parameter(R),and electro-osmotic parameter(k)is investigated on the velocity of magnetic nanoparticles and blood flow.Results obtained show that the electro-osmotic parameter,along with Hartmann’s number,dramatically affects the velocity of magnetic nanoparticles,blood flow velocity,and flow rate.Moreover,results also reveal that at a higher Hartman number,homogeneity in nanoparticles distribution improved considerably.The particle concentration andmass parameters effectively influence the capturing effect on nanoparticles in the blood flow using a micro-tube for magnetic drug targeting.Lastly,investigation also indicates that the OHAM analysis is efficient and quick to handle the system of nonlinear equations.展开更多
文章从节点间的联系情况出发,提出了一种基于节点接触频率和持续时间率的数据转发(contact frequency and time ratio-based data forwarding,CFTDF)算法。其主要思想是利用节点历史相遇信息来预测未来节点接触频率和持续时间率,以此定...文章从节点间的联系情况出发,提出了一种基于节点接触频率和持续时间率的数据转发(contact frequency and time ratio-based data forwarding,CFTDF)算法。其主要思想是利用节点历史相遇信息来预测未来节点接触频率和持续时间率,以此定义节点间的活性,并根据相遇节点分别与目的节点之间活性值大小来决定数据转发节点的选择。仿真结果表明:与Epidemic算法相比,该文所提出的CFTDF算法明显地降低数据包的拷贝数目;与间接概率转发(probability-inferred forwarding,PIF)算法相比,CFTDF算法可减少数据包的传递延迟和数据包的拷贝数目。展开更多
背景:纳米材料是抗肿瘤药物的理想载体,具有重要的科学价值和应用价值,为临床抗肿瘤提供了新的有效手段。目的:系统评价纳米给药系统在肿瘤靶向治疗的基础研究及临床应用。方法:以"nanoparticle,cancer,drug delivery system,nanot...背景:纳米材料是抗肿瘤药物的理想载体,具有重要的科学价值和应用价值,为临床抗肿瘤提供了新的有效手段。目的:系统评价纳米给药系统在肿瘤靶向治疗的基础研究及临床应用。方法:以"nanoparticle,cancer,drug delivery system,nanotube,nanosphere"为关键词,计算机检索北美临床试验注册中心及Web of Science数据库2000-01-01/2012-12-31发表的纳米给药系统在肿瘤靶向治疗相关临床试验注册项目及文献。根据纳入与排除标准筛选文献,将检索结果以注册号、注册题目、项目状态、干预措施、试验的申办者、试验的疾病种类导出进行评价质量及文献分析。结果与结论:①北美临床试验注册中心关于纳米给药系统在肿瘤靶向治疗的相关临床试验研究开始于1999年,共检索到注册项目489项,经查阅后,共有429项纳入了分析。美国注册的纳米载体肿瘤靶向给药临床试验项目最多,共112项,其次为加拿大24项。中国注册的临床试验有22项,其中大陆注册8项,香港地区注册4项,台湾地区注册10项。研究的注册数量2003年跌至谷底,只有5项注册项目,之后数量大幅度升高,在2008年注册项目数量达到顶峰,为56项。2008年后,注册的项目数量处于波动状态。②北美临床试验注册中心纳米给药系统在肿瘤靶向治疗的相关临床试验项目样本量在1-2000之间,以50人以下的小样本研究为主。研究的肿瘤类型以乳腺癌为主,其次为内分泌腺瘤及淋巴瘤。③2000-01-01/2012-12-31在Web of Science数据库发表的纳米载体肿瘤靶向给药相关文章4497篇,其中,美国发文量占总数比重最大(66.42%),发表文章2987篇。高被引文章主要发表在Proceedings of the National Academy of Sciences of the United States of America(《美国科学院院刊》)。展开更多
基金the research grant of Jeju National University in 2020,the Basic Science Research Program through the National Research Foundation of Korea(NRF)grant funded by the Korea Government(Ministry of Science and ICT)(NRF-2018R1A4A1025998)Higher Education Commission of Pakistan(Project No.210-3800/NRPU/R&D/HEC/1530).
文摘In recent years,the emergence of nanotechnology experienced incredible development in the field of medical sciences.During the past decade,investigating the characteristics of nanoparticles during fluid flow has been one of the intriguing issues.Nanoparticle distribution and uniformity have emerged as substantial criteria in both medical and engineering applications.Adverse effects of chemotherapy on healthy tissues are known to be a significant concern during cancer therapy.A novel treatment method of magnetic drug targeting(MDT)has emerged as a promising topical cancer treatment along with some attractive advantages of improving efficacy,fewer side effects,and reduce drug dose.During magnetic drug targeting,the appropriate movement of nanoparticles(magnetic)as carriers is essential for the therapeutic process in the blood clot removal,infection treatment,and tumor cell treatment.In this study,we have numerically investigated the behavior of an unsteady blood flowinfused with magnetic nanoparticles during MDT under the influence of a uniform external magnetic field in a microtube.An optimal homotopy asymptotic method(OHAM)is employed to compute the governing equation for unsteady electromagnetohydrodynamics flow.The influence of Hartmann number(Ha),particle mass parameter(G),particle concentration parameter(R),and electro-osmotic parameter(k)is investigated on the velocity of magnetic nanoparticles and blood flow.Results obtained show that the electro-osmotic parameter,along with Hartmann’s number,dramatically affects the velocity of magnetic nanoparticles,blood flow velocity,and flow rate.Moreover,results also reveal that at a higher Hartman number,homogeneity in nanoparticles distribution improved considerably.The particle concentration andmass parameters effectively influence the capturing effect on nanoparticles in the blood flow using a micro-tube for magnetic drug targeting.Lastly,investigation also indicates that the OHAM analysis is efficient and quick to handle the system of nonlinear equations.
文摘文章从节点间的联系情况出发,提出了一种基于节点接触频率和持续时间率的数据转发(contact frequency and time ratio-based data forwarding,CFTDF)算法。其主要思想是利用节点历史相遇信息来预测未来节点接触频率和持续时间率,以此定义节点间的活性,并根据相遇节点分别与目的节点之间活性值大小来决定数据转发节点的选择。仿真结果表明:与Epidemic算法相比,该文所提出的CFTDF算法明显地降低数据包的拷贝数目;与间接概率转发(probability-inferred forwarding,PIF)算法相比,CFTDF算法可减少数据包的传递延迟和数据包的拷贝数目。
文摘背景:纳米材料是抗肿瘤药物的理想载体,具有重要的科学价值和应用价值,为临床抗肿瘤提供了新的有效手段。目的:系统评价纳米给药系统在肿瘤靶向治疗的基础研究及临床应用。方法:以"nanoparticle,cancer,drug delivery system,nanotube,nanosphere"为关键词,计算机检索北美临床试验注册中心及Web of Science数据库2000-01-01/2012-12-31发表的纳米给药系统在肿瘤靶向治疗相关临床试验注册项目及文献。根据纳入与排除标准筛选文献,将检索结果以注册号、注册题目、项目状态、干预措施、试验的申办者、试验的疾病种类导出进行评价质量及文献分析。结果与结论:①北美临床试验注册中心关于纳米给药系统在肿瘤靶向治疗的相关临床试验研究开始于1999年,共检索到注册项目489项,经查阅后,共有429项纳入了分析。美国注册的纳米载体肿瘤靶向给药临床试验项目最多,共112项,其次为加拿大24项。中国注册的临床试验有22项,其中大陆注册8项,香港地区注册4项,台湾地区注册10项。研究的注册数量2003年跌至谷底,只有5项注册项目,之后数量大幅度升高,在2008年注册项目数量达到顶峰,为56项。2008年后,注册的项目数量处于波动状态。②北美临床试验注册中心纳米给药系统在肿瘤靶向治疗的相关临床试验项目样本量在1-2000之间,以50人以下的小样本研究为主。研究的肿瘤类型以乳腺癌为主,其次为内分泌腺瘤及淋巴瘤。③2000-01-01/2012-12-31在Web of Science数据库发表的纳米载体肿瘤靶向给药相关文章4497篇,其中,美国发文量占总数比重最大(66.42%),发表文章2987篇。高被引文章主要发表在Proceedings of the National Academy of Sciences of the United States of America(《美国科学院院刊》)。
