A Mobile Ad-hoc NETwork(MANET)contains numerous mobile nodes,and it forms a structure-less network associated with wireless links.But,the node movement is the key feature of MANETs;hence,the quick action of the nodes ...A Mobile Ad-hoc NETwork(MANET)contains numerous mobile nodes,and it forms a structure-less network associated with wireless links.But,the node movement is the key feature of MANETs;hence,the quick action of the nodes guides a link failure.This link failure creates more data packet drops that can cause a long time delay.As a result,measuring accurate link failure time is the key factor in the MANET.This paper presents a Fuzzy Linear Regression Method to measure Link Failure(FLRLF)and provide an optimal route in the MANET-Internet of Things(IoT).This work aims to predict link failure and improve routing efficiency in MANET.The Fuzzy Linear Regression Method(FLRM)measures the long lifespan link based on the link failure.The mobile node group is built by the Received Signal Strength(RSS).The Hill Climbing(HC)method selects the Group Leader(GL)based on node mobility,node degree and node energy.Additionally,it uses a Data Gathering node forward the infor-mation from GL to the sink node through multiple GL.The GL is identified by linking lifespan and energy using the Particle Swarm Optimization(PSO)algo-rithm.The simulation results demonstrate that the FLRLF approach increases the GL lifespan and minimizes the link failure time in the MANET.展开更多
建立一种基于美国官方分析化学师协会(Association of Official Analytical Chemists,AOAC)方法检测黑果枸杞及其制品中花青素含量的改进pH示差法。考察了黑果枸杞及其制品中花青素的最佳提取和检测条件,通过液相色谱-三重四级杆串联质...建立一种基于美国官方分析化学师协会(Association of Official Analytical Chemists,AOAC)方法检测黑果枸杞及其制品中花青素含量的改进pH示差法。考察了黑果枸杞及其制品中花青素的最佳提取和检测条件,通过液相色谱-三重四级杆串联质谱法鉴别出黑果枸杞中花青素的具体化学结构,并计算出混合花青素的平均摩尔质量。通过分光光度法测得混合花青素的平均摩尔消光系数,对改进后的pH示差法进行方法学验证和花青素的含量测定。结果显示,最佳提取和检测条件如下:黑果枸杞花青素提取溶剂为盐酸-80%(体积分数)乙醇(3∶97,体积比),料液比为1∶100(g∶mL),提取温度为50℃,提取时间为30 min,缓冲溶液稀释5倍后静置平衡20 min。液相色谱-三重四级杆串联质谱法鉴别黑果枸杞中主要以矮牵牛素类花青素为主(占97.96%),黑果枸杞特有的混合花青素平均摩尔质量为912.7 g/mol,平均摩尔消光系数为29591 L/(mol·cm)。pH示差法改进后能够满足方法学验证要求,固体样品和液体样品最低检出限分别为28.2 mg/100 g、0.282 mg/100 mL。方法改进后花青素提取增长率均大于20%,静置平衡20 min后单次检测结果精密度小于0.3%。以矮牵牛素类花青素代替矢车菊素-3-O-葡萄糖苷计算花青素含量平均提高了2.41倍,能真实地反映黑果枸杞及其制品中花青素的含量。展开更多
目的快速制备并分离纯化硫化氢特异性荧光探针(Washington State Probe-5),建立动物组织中硫化氢的荧光探针测定法,并在癌性胸水模型中进行方法适用性验证。方法优化条件分离纯化WSP-5;对荧光探针反应液配制溶剂、DMSO加入体积、pH、反...目的快速制备并分离纯化硫化氢特异性荧光探针(Washington State Probe-5),建立动物组织中硫化氢的荧光探针测定法,并在癌性胸水模型中进行方法适用性验证。方法优化条件分离纯化WSP-5;对荧光探针反应液配制溶剂、DMSO加入体积、pH、反应液溶剂和反应液体积、样品前处理温度、研磨次数、研磨后静置时间等条件进行考察;以S-180腹水瘤细胞建立癌性胸水小鼠模型,测定小鼠各脏器中的硫化氢含量。结果以硅胶和葡聚糖凝胶为固定相,二氯甲烷-甲醇-甲酸(60∶1∶0.1,V/V/V)和二氯甲烷-甲醇(1∶1,V/V)为洗脱剂制备WSP-5纯品;动物组织样本和硫氢化钠标准溶液加入优化后的5倍量冰冷反应液,低温研磨、高速离心,上清液避光孵育12 h,测定荧光强度并计算硫化氢浓度;该方法检测限约0.6μmol·L^(-1),定量限1μmol·L^(-1),在硫氢化钠一定浓度范围内,浓度与荧光强度线性系数均大于0.99;在癌性胸水小鼠模型中,各脏器硫化氢含量随着注射癌细胞数量的增多均有不同程度的增加趋势。结论该方法操作简单、成本低、灵敏度高、特异性强,适合各类组织样本的高通量检测,可为硫化氢相关药效机制的深入研究和相关药物开发提供方法学参考。展开更多
文摘A Mobile Ad-hoc NETwork(MANET)contains numerous mobile nodes,and it forms a structure-less network associated with wireless links.But,the node movement is the key feature of MANETs;hence,the quick action of the nodes guides a link failure.This link failure creates more data packet drops that can cause a long time delay.As a result,measuring accurate link failure time is the key factor in the MANET.This paper presents a Fuzzy Linear Regression Method to measure Link Failure(FLRLF)and provide an optimal route in the MANET-Internet of Things(IoT).This work aims to predict link failure and improve routing efficiency in MANET.The Fuzzy Linear Regression Method(FLRM)measures the long lifespan link based on the link failure.The mobile node group is built by the Received Signal Strength(RSS).The Hill Climbing(HC)method selects the Group Leader(GL)based on node mobility,node degree and node energy.Additionally,it uses a Data Gathering node forward the infor-mation from GL to the sink node through multiple GL.The GL is identified by linking lifespan and energy using the Particle Swarm Optimization(PSO)algo-rithm.The simulation results demonstrate that the FLRLF approach increases the GL lifespan and minimizes the link failure time in the MANET.
文摘目的快速制备并分离纯化硫化氢特异性荧光探针(Washington State Probe-5),建立动物组织中硫化氢的荧光探针测定法,并在癌性胸水模型中进行方法适用性验证。方法优化条件分离纯化WSP-5;对荧光探针反应液配制溶剂、DMSO加入体积、pH、反应液溶剂和反应液体积、样品前处理温度、研磨次数、研磨后静置时间等条件进行考察;以S-180腹水瘤细胞建立癌性胸水小鼠模型,测定小鼠各脏器中的硫化氢含量。结果以硅胶和葡聚糖凝胶为固定相,二氯甲烷-甲醇-甲酸(60∶1∶0.1,V/V/V)和二氯甲烷-甲醇(1∶1,V/V)为洗脱剂制备WSP-5纯品;动物组织样本和硫氢化钠标准溶液加入优化后的5倍量冰冷反应液,低温研磨、高速离心,上清液避光孵育12 h,测定荧光强度并计算硫化氢浓度;该方法检测限约0.6μmol·L^(-1),定量限1μmol·L^(-1),在硫氢化钠一定浓度范围内,浓度与荧光强度线性系数均大于0.99;在癌性胸水小鼠模型中,各脏器硫化氢含量随着注射癌细胞数量的增多均有不同程度的增加趋势。结论该方法操作简单、成本低、灵敏度高、特异性强,适合各类组织样本的高通量检测,可为硫化氢相关药效机制的深入研究和相关药物开发提供方法学参考。