目的建立不同产地喜树果中9个成分含量同步检测方法,筛选影响其质量的差异标志物,并对其进行质量评价。方法对7省18个批次喜树果样品进行回流提取,提取物采用高效液相色谱法检测;采用正交偏最小二乘判别分析(Orthogonal partial least s...目的建立不同产地喜树果中9个成分含量同步检测方法,筛选影响其质量的差异标志物,并对其进行质量评价。方法对7省18个批次喜树果样品进行回流提取,提取物采用高效液相色谱法检测;采用正交偏最小二乘判别分析(Orthogonal partial least squares discriminant analysis,OPLS-DA)和加权逼近理想解排序(Technique for order preference by similarity to an ideal solution,TOPSIS)法建立喜树果质量优劣评价模型,对其质量差异性进行综合评价。结果3,4′-O-二甲基鞣花酸、丁香酸、10-羟基喜树碱、喜树碱、10-甲氧基喜树碱、三叶豆苷、短小蛇根草苷、金丝桃苷和喜果苷分别在0.51-12.75、0.23-5.75、3.21-80.25、4.45-111.25、1.88-47.00、0.41-10.25、2.05-51.25、0.34-8.50和7.95-198.75μg·mL^(-1)范围内线性关系良好(r>0.999),平均加样回收率96.95%-100.06%(RSD<2.0%);18批样品聚为3类;喜果苷、10-羟基喜树碱、喜树碱、10-甲氧基喜树碱和短小蛇根草苷可能是影响喜树果产品质量主要潜在标志物;加权TOPSIS法分析结果显示18批喜树果质量评价贴近度(Jb)在0.1090-0.7385,其中S14最大(0.7385)。结论建立了同时测定喜树果中9种成分含量的方法,操作简便、结果准确;采用OPLS-DA及加权TOPSIS法进行客观全面评价,可用于喜树果质量差异性评价。展开更多
RBOE is a new type of DNAN-based high-energy melt-cast mixed explosive,whose safety under thermal stimulation is significantly affected by heating conditions and venting area of the warhead.Based on the thermal decomp...RBOE is a new type of DNAN-based high-energy melt-cast mixed explosive,whose safety under thermal stimulation is significantly affected by heating conditions and venting area of the warhead.Based on the thermal decomposition reaction characteristics and combustion characteristics of each component of RBOE explosive,the cook-off calculation models of RBOE warhead before and after ignition were established.In addition,closed and vented warheads were designed,as well as fast and slow cook-off test devices.The cook-off characteristics and thermal safety venting area of RBOE warhead were extensively studied.The results showed that the closed RBOE warhead underwent deflagration reaction under both slow and fast cook-off conditions.The calculation result of the shell wall temperature before slow cookoff ignition response of the warhead was 454.06 K,with an error of+1.75%compared to the test result of462.15 K,and the temperature rise rate calculated was in good agreement with the test.The calculated ignition time of RBOE warhead under fast cook-off was 161 s,with an error of+8.8%compared to the test result of 148 s,which verified the accuracy of cook-off model of RBOE warhead before ignition.According to the cook-off calculation model of the warhead after ignition and cook-off test of the vented warhead,it was determined that the thermal safety venting area was 1124.61 mm^(2)for fast cook-off and 530.66 mm~2 for slow cook-off,effectively preventing the reaction of warhead above combustion.Therefore,this study provides a scientific basis for the thermal safety design and evaluation of insensitive warheads.展开更多
A 16-channel arrayed waveguide grating(AWG)with an 800 GHz channel spacing in the O-band has been developed and fabricated based on silica planar lightwave circuit(PLC)technology.By extending the wave⁃length allocatio...A 16-channel arrayed waveguide grating(AWG)with an 800 GHz channel spacing in the O-band has been developed and fabricated based on silica planar lightwave circuit(PLC)technology.By extending the wave⁃length allocation from 8 channels to 16 channels as specified in IEEE 802.3bs,we increased the number of chan⁃nels and boosted transmission capacity to meet the 1.6 Tbps and higher-speed signal transmission requirements for future data centers.Through optimizing the AWG structure,it has achieved insertion loss(IL)better than-1.61 dB,loss uniformity below 0.35 dB,polarization-dependent loss(PDL)below 0.35 dB,adjacent channel cross⁃talk under-20.05 dB,ripple less than 0.75 dB,center wavelength offset under 0.22 nm and 1 dB bandwidth ex⁃ceeding 2.88 nm.The AWG has been successfully measured to transmit 53 Gbaud 4-level pulse amplitude modu⁃lation(PAM4)signal per channel and the total transmission speed can reach over 1.6 Tbps.展开更多
In the field of calculating the attack area of air-to-air missiles in modern air combat scenarios,the limitations of existing research,including real-time calculation,accuracy efficiency trade-off,and the absence of t...In the field of calculating the attack area of air-to-air missiles in modern air combat scenarios,the limitations of existing research,including real-time calculation,accuracy efficiency trade-off,and the absence of the three-dimensional attack area model,restrict their practical applications.To address these issues,an improved backtracking algorithm is proposed to improve calculation efficiency.A significant reduction in solution time and maintenance of accuracy in the three-dimensional attack area are achieved by using the proposed algorithm.Furthermore,the age-layered population structure genetic programming(ALPS-GP)algorithm is introduced to determine an analytical polynomial model of the three-dimensional attack area,considering real-time requirements.The accuracy of the polynomial model is enhanced through the coefficient correction using an improved gradient descent algorithm.The study reveals a remarkable combination of high accuracy and efficient real-time computation,with a mean error of 91.89 m using the analytical polynomial model of the three-dimensional attack area solved in just 10^(-4)s,thus meeting the requirements of real-time combat scenarios.展开更多
文摘目的建立不同产地喜树果中9个成分含量同步检测方法,筛选影响其质量的差异标志物,并对其进行质量评价。方法对7省18个批次喜树果样品进行回流提取,提取物采用高效液相色谱法检测;采用正交偏最小二乘判别分析(Orthogonal partial least squares discriminant analysis,OPLS-DA)和加权逼近理想解排序(Technique for order preference by similarity to an ideal solution,TOPSIS)法建立喜树果质量优劣评价模型,对其质量差异性进行综合评价。结果3,4′-O-二甲基鞣花酸、丁香酸、10-羟基喜树碱、喜树碱、10-甲氧基喜树碱、三叶豆苷、短小蛇根草苷、金丝桃苷和喜果苷分别在0.51-12.75、0.23-5.75、3.21-80.25、4.45-111.25、1.88-47.00、0.41-10.25、2.05-51.25、0.34-8.50和7.95-198.75μg·mL^(-1)范围内线性关系良好(r>0.999),平均加样回收率96.95%-100.06%(RSD<2.0%);18批样品聚为3类;喜果苷、10-羟基喜树碱、喜树碱、10-甲氧基喜树碱和短小蛇根草苷可能是影响喜树果产品质量主要潜在标志物;加权TOPSIS法分析结果显示18批喜树果质量评价贴近度(Jb)在0.1090-0.7385,其中S14最大(0.7385)。结论建立了同时测定喜树果中9种成分含量的方法,操作简便、结果准确;采用OPLS-DA及加权TOPSIS法进行客观全面评价,可用于喜树果质量差异性评价。
基金National Natural Science Foundation of china(Grant No.12402468)。
文摘RBOE is a new type of DNAN-based high-energy melt-cast mixed explosive,whose safety under thermal stimulation is significantly affected by heating conditions and venting area of the warhead.Based on the thermal decomposition reaction characteristics and combustion characteristics of each component of RBOE explosive,the cook-off calculation models of RBOE warhead before and after ignition were established.In addition,closed and vented warheads were designed,as well as fast and slow cook-off test devices.The cook-off characteristics and thermal safety venting area of RBOE warhead were extensively studied.The results showed that the closed RBOE warhead underwent deflagration reaction under both slow and fast cook-off conditions.The calculation result of the shell wall temperature before slow cookoff ignition response of the warhead was 454.06 K,with an error of+1.75%compared to the test result of462.15 K,and the temperature rise rate calculated was in good agreement with the test.The calculated ignition time of RBOE warhead under fast cook-off was 161 s,with an error of+8.8%compared to the test result of 148 s,which verified the accuracy of cook-off model of RBOE warhead before ignition.According to the cook-off calculation model of the warhead after ignition and cook-off test of the vented warhead,it was determined that the thermal safety venting area was 1124.61 mm^(2)for fast cook-off and 530.66 mm~2 for slow cook-off,effectively preventing the reaction of warhead above combustion.Therefore,this study provides a scientific basis for the thermal safety design and evaluation of insensitive warheads.
基金Supported by the National Key Research and Development Program of China(2021YFB2800201)the Strategic Priority Research Program of Chinese Academy of Sciences(XDB43000000)。
文摘A 16-channel arrayed waveguide grating(AWG)with an 800 GHz channel spacing in the O-band has been developed and fabricated based on silica planar lightwave circuit(PLC)technology.By extending the wave⁃length allocation from 8 channels to 16 channels as specified in IEEE 802.3bs,we increased the number of chan⁃nels and boosted transmission capacity to meet the 1.6 Tbps and higher-speed signal transmission requirements for future data centers.Through optimizing the AWG structure,it has achieved insertion loss(IL)better than-1.61 dB,loss uniformity below 0.35 dB,polarization-dependent loss(PDL)below 0.35 dB,adjacent channel cross⁃talk under-20.05 dB,ripple less than 0.75 dB,center wavelength offset under 0.22 nm and 1 dB bandwidth ex⁃ceeding 2.88 nm.The AWG has been successfully measured to transmit 53 Gbaud 4-level pulse amplitude modu⁃lation(PAM4)signal per channel and the total transmission speed can reach over 1.6 Tbps.
基金National Natural Science Foundation of China(62373187)Forward-looking Layout Special Projects(ILA220591A22)。
文摘In the field of calculating the attack area of air-to-air missiles in modern air combat scenarios,the limitations of existing research,including real-time calculation,accuracy efficiency trade-off,and the absence of the three-dimensional attack area model,restrict their practical applications.To address these issues,an improved backtracking algorithm is proposed to improve calculation efficiency.A significant reduction in solution time and maintenance of accuracy in the three-dimensional attack area are achieved by using the proposed algorithm.Furthermore,the age-layered population structure genetic programming(ALPS-GP)algorithm is introduced to determine an analytical polynomial model of the three-dimensional attack area,considering real-time requirements.The accuracy of the polynomial model is enhanced through the coefficient correction using an improved gradient descent algorithm.The study reveals a remarkable combination of high accuracy and efficient real-time computation,with a mean error of 91.89 m using the analytical polynomial model of the three-dimensional attack area solved in just 10^(-4)s,thus meeting the requirements of real-time combat scenarios.
文摘针对传统方法在计算低压台区理论线损率时出现的数据质量要求高、物理结构依赖度高等问题,文章提出一种基于自适应增强(adaptive boosting,AdaBoost)集成学习的低压台区理论线损计算方法。综合考虑低压台区网架结构参数、台区运行方式、用电负荷水平等各类因素,形成影响因素特征指标体系,进一步通过AdaBoost算法训练各分类与回归树(classification and regression tree,CART)决策树个体学习器并计算各个体学习器的权重系数,利用个体学习器的线性组合集成得到最终的理论线损计算法模型,同时在此基础上分析研究了典型重要因素对理论线损的影响规律。结果表明:所提算法具有良好的可靠性与稳定性,可以实现不同因素对台区理论线损影响规律的分析,进一步可以支撑不同因素影响程度的横向比较,可为台区的线损异常治理提供方向性指导。
