To improve the positioning accuracy in GPS point positioning, the geometric dilution of precision （GDOP） including HDOP, VDOP, TDOP, PDOP is commonly considered. The properties of the DOP for the GPS satellite navig...To improve the positioning accuracy in GPS point positioning, the geometric dilution of precision （GDOP） including HDOP, VDOP, TDOP, PDOP is commonly considered. The properties of the DOP for the GPS satellite navigation system are studied and the coordinate system is improved in order to decrease the amount of variables. In the end, by simulation and discussing the results, the corresponding conclusions are presented.展开更多
An experiment was conducted to study the response of broiler to diet dilution during the finishing period. Sixty 29-day-old commercial Avian male broiler chicks were assigned to two groups randomly, with 30 broilers e...An experiment was conducted to study the response of broiler to diet dilution during the finishing period. Sixty 29-day-old commercial Avian male broiler chicks were assigned to two groups randomly, with 30 broilers each. Birds were offered a conventional finishing diet or with 10% dilution diet with ground rice hulls from 29 to 49 days of age. The result showed that there were no significant differences between the effects of diet dilution and the control on final body weight, growth rate and feed conversion efficiency. Diet dilution led to a reduction in abdominal fat weight, whereas carcass and breast muscle weight were not affected.展开更多
A method for the determination of vitamin A in milk powder was developed by high performance liquid chromatography-isotope dilution mass spectrometry(HPLC-ID MS) and using deuterium-labeled vitamin A as an internal st...A method for the determination of vitamin A in milk powder was developed by high performance liquid chromatography-isotope dilution mass spectrometry(HPLC-ID MS) and using deuterium-labeled vitamin A as an internal standard.RSD of the method was 2.85%.This method was applied in the determination of standard reference material SRM 1849 with satisfactory results.展开更多
The mass of oligonucleotides was quantitated by liquid chromatography-isotope dilution mass spectrometry.The uncertainty was calculated.This could provide information for the further quantitative measurement and utili...The mass of oligonucleotides was quantitated by liquid chromatography-isotope dilution mass spectrometry.The uncertainty was calculated.This could provide information for the further quantitative measurement and utilization of DNA.展开更多
This article concentrates on the method of the determination of diazepam and chlorpromazine residue in meat and kidney,by using HPLC-MS/MS.The D6-chlorpromazine was added to sample as an internal standard.Then extract...This article concentrates on the method of the determination of diazepam and chlorpromazine residue in meat and kidney,by using HPLC-MS/MS.The D6-chlorpromazine was added to sample as an internal standard.Then extracted the sample with acetonitrile,cleaned up the extract through Oasis HLB cartridge.Determination and confirmation is made by means of liquid chromatography-tandem mass spectrometry,using internal standard method.The limit of quantitation of chlorpromazine and diazepam are all 1.0 μg/kg.展开更多
The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs w...The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs was extracted from samples by Soxhlet extraction,concentrated and purified by FMS column chromatograph,carbon column enrichment.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).TEQ concentration was calculated by WHO-TEF multiplying by concentration of seventeen PCDD/Fs congener.Median of PCDD/Fs concentration for fish,livestock,poultry,egg,vegetable oil,milk,vegetable totally 100 samples for ten diverse foods didn’t exceed the limit standards by EU.The level of PCDD/Fs for different food in the certain area was lower or comparable to the data reported by developed country in the world.The total weekly intake and monthly intake for local population or national population was 3.44,14.8 WHO-TEQ/kg BW and 1.5,6.42 pg WHO-TEQ/kg BW respectively,the value was lower than the Tolerable Weekly Intake of 14 pg WHO TEQ/kg BW for PCDDs,PCDFs and dioxin-like PCBs established by EU Scientific Committee for Food.The dietary PCDD/Fs intake for local people was higher than national population.And animal food was the dominant contributor to the total dietary intake,which accounted for more than 70 percent.These levels of consumption of diverse food containing typical levels of PCDD/Fs doesn’t present a risk to the health of the local population.But integrative dietary intake could be evaluated including of PCBs intake for population in the future.展开更多
Platinum group elements (PGEs) includes platinum, palladium, iridium, osmium, rhodium and ruthenium. It has very high economic and scientific value in the field of geoscience and environmental science. But the analysi...Platinum group elements (PGEs) includes platinum, palladium, iridium, osmium, rhodium and ruthenium. It has very high economic and scientific value in the field of geoscience and environmental science. But the analysis data referred by the different lab are very disperse because of the difficulty of the determination of PGEs. It makes very difficult to fix the value of the PGEs in the standard reference materials. In the article, the values of the PGEs in the standard reference materials of ocean sediment are determined by isotope dilution technique and dependable values of these elements are provided.展开更多
The concept of metrological traceability in laboratory medicine has increasingly received considerable recognition worldwide.The Consultative Committee for Amount of Substance (CCQM) which concerned international comp...The concept of metrological traceability in laboratory medicine has increasingly received considerable recognition worldwide.The Consultative Committee for Amount of Substance (CCQM) which concerned international comparisons and establishment of international equivalence between national laboratories had organized international comparison CCQM-P77a: determination of serum cortisol in 2006.National Institute of Metrology (NIM) took part in the comparison as the representative of China and received good performance according to the results published by CCQM.展开更多
The method of isotope dilution thermal ionization mass spectrometry able to trace to SI was developed to accurately measure trace amount of cadmium in the rice powder sample from CCQM-K24 international key comparison ...The method of isotope dilution thermal ionization mass spectrometry able to trace to SI was developed to accurately measure trace amount of cadmium in the rice powder sample from CCQM-K24 international key comparison organized by CCQM(Comité Consultatif pour la Quantité de Matière, Paris). By comparison with our previous work, there was much improvement in aspects of digestion of the rice powder sample, separation of cadmium from the sample and dry-mass correction. As a result, the blank of this procedure was reduced and the measurement precisions of isotopic ratios of cadmium were increased. In addition, the uncertainty evaluation of the entire process of measurement was profoundly studied. The analytical result of this work (14.53±0.15) nmol/g was in agreement with the certified value.展开更多
The technique of sample handling for uranium in machine oil was introduced by burning, nitric acid and vitriol. The effects of separations were analyzed by isotope dilution mass spectrum (IDMS). The effect of separati...The technique of sample handling for uranium in machine oil was introduced by burning, nitric acid and vitriol. The effects of separations were analyzed by isotope dilution mass spectrum (IDMS). The effect of separation by vitriol and nitric acid are better than that by burning. Vitriol can carbonize oil better.展开更多
Adenosine 5′-monophosphate in powdered milk was quantitated by liquid chromatography-isotope dilution mass spectrometry.The uncertainty was calculated.This could provide information for the further quantitative measu...Adenosine 5′-monophosphate in powdered milk was quantitated by liquid chromatography-isotope dilution mass spectrometry.The uncertainty was calculated.This could provide information for the further quantitative measurement and utilization of 5′-nucleotide acid as food additive.展开更多
The presented work is to determine the mass fraction of angiotensinⅠ in solution by isotope dilution method,which is a pilot study organized by Consultative Committee for Amount of Substance.Firstly,the hydrolysis ti...The presented work is to determine the mass fraction of angiotensinⅠ in solution by isotope dilution method,which is a pilot study organized by Consultative Committee for Amount of Substance.Firstly,the hydrolysis time and hydrochloric acid addition volume ratio were optimized and the degradation of natural and isotope labeled proline,valine,leucine and phenylalanine during the hydrolysis process were investigated.Secondly,the mass fractions of proline,valine,isoleucine and phenylalanine in the angiotensinⅠhydrolysis solution was determined employing isotope dilution method with their reference materials as standards.Finally,the angiotensinⅠ mass fraction and associated uncertainty were calculated according to the amino acid mass fraction obtained,which was(75.2±2.6) μg/g.It showed that the result obtained in this paper has good equivalence with the average.It can be concluded that the isotope dilution method for peptide quantification is accurate and is suitable for peptide reference materials production.展开更多
Phenylalanine in serum was determined by HPLC isotope dilution mass spectrometry method with D8 labeled phenylalanine as internal standard.Phenylalanine and its isotope labeled analogue were monitored at the transitio...Phenylalanine in serum was determined by HPLC isotope dilution mass spectrometry method with D8 labeled phenylalanine as internal standard.Phenylalanine and its isotope labeled analogue were monitored at the transitions m/z=166→120 and 172→126 in multiple reaction monitoring (MRM) mode,respectively,which effectively eliminated the matrix effect.The RSD for 5 repeats measurement of the same sample was 0.5%.Uncertainty was evaluated,which showed the main uncertainty was from the purity assessment of phenylalanine reference material and the variation of method.The presented method can be applied into value assessment of reference material of phenylalanine in serum,and it can be also used for traceability establishment of the measurement of phenylalanine in serum.展开更多
针对现有基于测距的集群UAV协同导航方法普遍忽略了空间构型对定位定能的影响,难以获得精确的导航定位结果,提出一种基于空间构型优选的5G集群UAV协同导航方法。构建了复杂环境下基于5G信号的UAV相对测距误差模型,基于最小几何精度因子(...针对现有基于测距的集群UAV协同导航方法普遍忽略了空间构型对定位定能的影响,难以获得精确的导航定位结果,提出一种基于空间构型优选的5G集群UAV协同导航方法。构建了复杂环境下基于5G信号的UAV相对测距误差模型,基于最小几何精度因子(geometric dilution of precision,GDOP)准则建立了协同导航节点寻优策略,实现了协同导航空间构型的实时优选;设计了基于5G测距网络的协同导航滤波器,对UAV导航信息进行在线估计和实时补偿,提高集群UAV的协同定位精度。仿真结果表明:该方法从机定位精度平均提升了约42.05%,为集群UAV实现在卫星不可用条件下的自主导航提供了一种有效的新方法。展开更多
According to the mining method for Dongguashan Copper Mine and Tongkeng Mine in China, and with the help of the cavity monitoring system（CMS） and mining software Surpac, the 3D cavity models were established exactly...According to the mining method for Dongguashan Copper Mine and Tongkeng Mine in China, and with the help of the cavity monitoring system（CMS） and mining software Surpac, the 3D cavity models were established exactly. A series of correlative techniques for calculating stope over-excavation and under-excavation, stope dilution and ore loss rates, and the blasting design of the pillar with complicated irregular boundaries were developed. These techniques were applied in Dongguashan Copper Mine and Tongkeng Mine successfully. Using these techniques, the dilution rates of stopes 52-2^#, 52-6^#, 52-8^#and 52-10^# of Dongguashan Copper Mine are calculated to be 2.12%, 8.46%, 12-67% and 10.68%, respectively, and the ore loss rates of stopes 52-6^# and 5-8^# are 4.41% and 3.70%, severally. Furthermore, according to the design accomplished by the technique for a pillar of Tongkeng Mine with irregular boundary, the volume, total length of boreholes and the dynamite quantity of the pillar are computed to be 1.2 ×10^4 m^3, 2.98 km and 10.97 t, correspondingly.展开更多
Based on multiple unmanned aerial vehicles（UAVs） flight at a constant altitude,a fault-tolerant cooperative localization algorithm against global positioning system（GPS） signal loss due to GPS receiver malfunction...Based on multiple unmanned aerial vehicles（UAVs） flight at a constant altitude,a fault-tolerant cooperative localization algorithm against global positioning system（GPS） signal loss due to GPS receiver malfunction is proposed.Contrast to the traditional means with single UAV,the proposed method is based on the use of inter-UAV relative range measurements against GPS signal loss and more suitable for the small-size and low-cost UAV applications.Firstly,for re-localizing an UAV with a malfunction in its GPS receiver,an algorithm which makes use of any other three healthy UAVs in the cooperative flight as the reference points for re-localization is proposed.Secondly,by using the relative ranges from the faulty UAV to the other three UAVs,its horizontal location can be determined after the GPS signal is lost.In order to improve an accuracy of the localization,a Kalman filter is further exploited to provide the estimated location of the UAV with the GPS signal loss.The Kalman filter calculates the variance of observations in terms of horizontal dilution of positioning（HDOP） automatically.Then,during each discrete computing time step,the best reference points are selected adaptively by minimizing the HDOP.Finally,two simulation examples in Matlab/Simulink environment with five UAVs in cooperative flight are shown to evaluate the effectiveness of the proposed method.展开更多
Group testing is a method that can be used to estimate the prevalence of rare infectious diseases,which can effectively save time and reduce costs compared to the method of random sampling.However,previous literature ...Group testing is a method that can be used to estimate the prevalence of rare infectious diseases,which can effectively save time and reduce costs compared to the method of random sampling.However,previous literature only demonstrated the optimality of group testing strategy while estimating prevalence under some strong assumptions.This article weakens the assumption of misclassification rate in the previous literature,considers the misclassification rate of the infected samples as a differentiable function of the pool size,and explores some optimal properties of group testing for estimating prevalence in the presence of differential misclassification conforming to this assumption.This article theoretically demonstrates that the group testing strategy performs better than the sample by sample procedure in estimating disease prevalence when the total number of sample pools is given or the size of the test population is determined.Numerical simulation experiments were conducted to evaluate the performance of group tests in estimating prevalence in the presence of dilution effect.展开更多
The dissolving processes,thermochemical properties and thermokinetic parameters of manganese carbohydrazide styph-nate([Mn2(CHZ)2(TNR)2(H2O)4]),nickel carbohydrazide styphnate([Ni(CHZ),(TNR)],)and lead carbohydrazide ...The dissolving processes,thermochemical properties and thermokinetic parameters of manganese carbohydrazide styph-nate([Mn2(CHZ)2(TNR)2(H2O)4]),nickel carbohydrazide styphnate([Ni(CHZ),(TNR)],)and lead carbohydrazide styphnate([Pb_(2)(CHZ)_(2)(TNR)_(2)(H_(2)O)_(2)])in N,N-dimethylformamide(DMF)at 298,15 K were studied by a SETARAM C80 calorime-ter.The results show that the dissolving process of them in DMF are exothermic,however the exothermic peaks are different.The results are associated with the different molecular structure and polarity of solutes.The empirical formulas for the enthalpies of dis-solution(△mH),the relative apparent molar enthalpies(ΦL;),the relative partial molar enthalpies(L,),and the enthalpies of di-lution(△aHt.:)are respectively deduced by polynomial fitting of experimental data.The standard enthalpies of dissolution(Aai H)are calculated respectively as-17.75kJ·mol^(-1),-29.76kJ·mol^(-1)and-15.35 kJ·mol^(-1).The rate constant of dissolution reaction(k),and the reaction order(n)are obtained from the kinetic formulas.展开更多
基金a grant from Science and Technology Commission of Shanghai Municipality (05dz15006)
文摘To improve the positioning accuracy in GPS point positioning, the geometric dilution of precision （GDOP） including HDOP, VDOP, TDOP, PDOP is commonly considered. The properties of the DOP for the GPS satellite navigation system are studied and the coordinate system is improved in order to decrease the amount of variables. In the end, by simulation and discussing the results, the corresponding conclusions are presented.
基金National Basic Research Program of China (2004CB11750-5)
文摘An experiment was conducted to study the response of broiler to diet dilution during the finishing period. Sixty 29-day-old commercial Avian male broiler chicks were assigned to two groups randomly, with 30 broilers each. Birds were offered a conventional finishing diet or with 10% dilution diet with ground rice hulls from 29 to 49 days of age. The result showed that there were no significant differences between the effects of diet dilution and the control on final body weight, growth rate and feed conversion efficiency. Diet dilution led to a reduction in abdominal fat weight, whereas carcass and breast muscle weight were not affected.
文摘A method for the determination of vitamin A in milk powder was developed by high performance liquid chromatography-isotope dilution mass spectrometry(HPLC-ID MS) and using deuterium-labeled vitamin A as an internal standard.RSD of the method was 2.85%.This method was applied in the determination of standard reference material SRM 1849 with satisfactory results.
文摘The mass of oligonucleotides was quantitated by liquid chromatography-isotope dilution mass spectrometry.The uncertainty was calculated.This could provide information for the further quantitative measurement and utilization of DNA.
文摘This article concentrates on the method of the determination of diazepam and chlorpromazine residue in meat and kidney,by using HPLC-MS/MS.The D6-chlorpromazine was added to sample as an internal standard.Then extracted the sample with acetonitrile,cleaned up the extract through Oasis HLB cartridge.Determination and confirmation is made by means of liquid chromatography-tandem mass spectrometry,using internal standard method.The limit of quantitation of chlorpromazine and diazepam are all 1.0 μg/kg.
文摘The status of PCDDs and PCDFs content in retail foods from a certain area by Isotope Dilution HRGC-HRMS was surveyed and the local population PCDD/Fs exposure from diverse foods and health risk was evaluated.PCDD/Fs was extracted from samples by Soxhlet extraction,concentrated and purified by FMS column chromatograph,carbon column enrichment.Confirmation and quantitative analysis at pg/g level of PCDD/Fs was performed by HRGC/HRMS using multiple ion detection mode(MID).TEQ concentration was calculated by WHO-TEF multiplying by concentration of seventeen PCDD/Fs congener.Median of PCDD/Fs concentration for fish,livestock,poultry,egg,vegetable oil,milk,vegetable totally 100 samples for ten diverse foods didn’t exceed the limit standards by EU.The level of PCDD/Fs for different food in the certain area was lower or comparable to the data reported by developed country in the world.The total weekly intake and monthly intake for local population or national population was 3.44,14.8 WHO-TEQ/kg BW and 1.5,6.42 pg WHO-TEQ/kg BW respectively,the value was lower than the Tolerable Weekly Intake of 14 pg WHO TEQ/kg BW for PCDDs,PCDFs and dioxin-like PCBs established by EU Scientific Committee for Food.The dietary PCDD/Fs intake for local people was higher than national population.And animal food was the dominant contributor to the total dietary intake,which accounted for more than 70 percent.These levels of consumption of diverse food containing typical levels of PCDD/Fs doesn’t present a risk to the health of the local population.But integrative dietary intake could be evaluated including of PCBs intake for population in the future.
文摘Platinum group elements (PGEs) includes platinum, palladium, iridium, osmium, rhodium and ruthenium. It has very high economic and scientific value in the field of geoscience and environmental science. But the analysis data referred by the different lab are very disperse because of the difficulty of the determination of PGEs. It makes very difficult to fix the value of the PGEs in the standard reference materials. In the article, the values of the PGEs in the standard reference materials of ocean sediment are determined by isotope dilution technique and dependable values of these elements are provided.
文摘The concept of metrological traceability in laboratory medicine has increasingly received considerable recognition worldwide.The Consultative Committee for Amount of Substance (CCQM) which concerned international comparisons and establishment of international equivalence between national laboratories had organized international comparison CCQM-P77a: determination of serum cortisol in 2006.National Institute of Metrology (NIM) took part in the comparison as the representative of China and received good performance according to the results published by CCQM.
文摘The method of isotope dilution thermal ionization mass spectrometry able to trace to SI was developed to accurately measure trace amount of cadmium in the rice powder sample from CCQM-K24 international key comparison organized by CCQM(Comité Consultatif pour la Quantité de Matière, Paris). By comparison with our previous work, there was much improvement in aspects of digestion of the rice powder sample, separation of cadmium from the sample and dry-mass correction. As a result, the blank of this procedure was reduced and the measurement precisions of isotopic ratios of cadmium were increased. In addition, the uncertainty evaluation of the entire process of measurement was profoundly studied. The analytical result of this work (14.53±0.15) nmol/g was in agreement with the certified value.
文摘The technique of sample handling for uranium in machine oil was introduced by burning, nitric acid and vitriol. The effects of separations were analyzed by isotope dilution mass spectrum (IDMS). The effect of separation by vitriol and nitric acid are better than that by burning. Vitriol can carbonize oil better.
文摘Adenosine 5′-monophosphate in powdered milk was quantitated by liquid chromatography-isotope dilution mass spectrometry.The uncertainty was calculated.This could provide information for the further quantitative measurement and utilization of 5′-nucleotide acid as food additive.
文摘The presented work is to determine the mass fraction of angiotensinⅠ in solution by isotope dilution method,which is a pilot study organized by Consultative Committee for Amount of Substance.Firstly,the hydrolysis time and hydrochloric acid addition volume ratio were optimized and the degradation of natural and isotope labeled proline,valine,leucine and phenylalanine during the hydrolysis process were investigated.Secondly,the mass fractions of proline,valine,isoleucine and phenylalanine in the angiotensinⅠhydrolysis solution was determined employing isotope dilution method with their reference materials as standards.Finally,the angiotensinⅠ mass fraction and associated uncertainty were calculated according to the amino acid mass fraction obtained,which was(75.2±2.6) μg/g.It showed that the result obtained in this paper has good equivalence with the average.It can be concluded that the isotope dilution method for peptide quantification is accurate and is suitable for peptide reference materials production.
文摘Phenylalanine in serum was determined by HPLC isotope dilution mass spectrometry method with D8 labeled phenylalanine as internal standard.Phenylalanine and its isotope labeled analogue were monitored at the transitions m/z=166→120 and 172→126 in multiple reaction monitoring (MRM) mode,respectively,which effectively eliminated the matrix effect.The RSD for 5 repeats measurement of the same sample was 0.5%.Uncertainty was evaluated,which showed the main uncertainty was from the purity assessment of phenylalanine reference material and the variation of method.The presented method can be applied into value assessment of reference material of phenylalanine in serum,and it can be also used for traceability establishment of the measurement of phenylalanine in serum.
文摘针对现有基于测距的集群UAV协同导航方法普遍忽略了空间构型对定位定能的影响,难以获得精确的导航定位结果,提出一种基于空间构型优选的5G集群UAV协同导航方法。构建了复杂环境下基于5G信号的UAV相对测距误差模型,基于最小几何精度因子(geometric dilution of precision,GDOP)准则建立了协同导航节点寻优策略,实现了协同导航空间构型的实时优选;设计了基于5G测距网络的协同导航滤波器,对UAV导航信息进行在线估计和实时补偿,提高集群UAV的协同定位精度。仿真结果表明:该方法从机定位精度平均提升了约42.05%,为集群UAV实现在卫星不可用条件下的自主导航提供了一种有效的新方法。
基金Projects(2007BAK22B04, 2006BAB02B05) supported by the National 11th Five-Year Science and Technology Supporting Plan of ChinaProject(50490274) supported by the National Natural Science Foundation of China
文摘According to the mining method for Dongguashan Copper Mine and Tongkeng Mine in China, and with the help of the cavity monitoring system（CMS） and mining software Surpac, the 3D cavity models were established exactly. A series of correlative techniques for calculating stope over-excavation and under-excavation, stope dilution and ore loss rates, and the blasting design of the pillar with complicated irregular boundaries were developed. These techniques were applied in Dongguashan Copper Mine and Tongkeng Mine successfully. Using these techniques, the dilution rates of stopes 52-2^#, 52-6^#, 52-8^#and 52-10^# of Dongguashan Copper Mine are calculated to be 2.12%, 8.46%, 12-67% and 10.68%, respectively, and the ore loss rates of stopes 52-6^# and 5-8^# are 4.41% and 3.70%, severally. Furthermore, according to the design accomplished by the technique for a pillar of Tongkeng Mine with irregular boundary, the volume, total length of boreholes and the dynamite quantity of the pillar are computed to be 1.2 ×10^4 m^3, 2.98 km and 10.97 t, correspondingly.
基金supported by the National Natural Science Foundation of China(60974146)the Natural Science and Engineering Research Council of Canada(NSERC)
文摘Based on multiple unmanned aerial vehicles（UAVs） flight at a constant altitude,a fault-tolerant cooperative localization algorithm against global positioning system（GPS） signal loss due to GPS receiver malfunction is proposed.Contrast to the traditional means with single UAV,the proposed method is based on the use of inter-UAV relative range measurements against GPS signal loss and more suitable for the small-size and low-cost UAV applications.Firstly,for re-localizing an UAV with a malfunction in its GPS receiver,an algorithm which makes use of any other three healthy UAVs in the cooperative flight as the reference points for re-localization is proposed.Secondly,by using the relative ranges from the faulty UAV to the other three UAVs,its horizontal location can be determined after the GPS signal is lost.In order to improve an accuracy of the localization,a Kalman filter is further exploited to provide the estimated location of the UAV with the GPS signal loss.The Kalman filter calculates the variance of observations in terms of horizontal dilution of positioning（HDOP） automatically.Then,during each discrete computing time step,the best reference points are selected adaptively by minimizing the HDOP.Finally,two simulation examples in Matlab/Simulink environment with five UAVs in cooperative flight are shown to evaluate the effectiveness of the proposed method.
基金supported by the National Natural Science Foundation of China(Grant No.72091212).
文摘Group testing is a method that can be used to estimate the prevalence of rare infectious diseases,which can effectively save time and reduce costs compared to the method of random sampling.However,previous literature only demonstrated the optimality of group testing strategy while estimating prevalence under some strong assumptions.This article weakens the assumption of misclassification rate in the previous literature,considers the misclassification rate of the infected samples as a differentiable function of the pool size,and explores some optimal properties of group testing for estimating prevalence in the presence of differential misclassification conforming to this assumption.This article theoretically demonstrates that the group testing strategy performs better than the sample by sample procedure in estimating disease prevalence when the total number of sample pools is given or the size of the test population is determined.Numerical simulation experiments were conducted to evaluate the performance of group tests in estimating prevalence in the presence of dilution effect.
基金Technology fund on Applied Physical Chemistry Laboratory(9140C3703051105 and 9140C370303120C37142)State Key Laboratory of Explosion Science and Technology(QNKT12-02)
文摘The dissolving processes,thermochemical properties and thermokinetic parameters of manganese carbohydrazide styph-nate([Mn2(CHZ)2(TNR)2(H2O)4]),nickel carbohydrazide styphnate([Ni(CHZ),(TNR)],)and lead carbohydrazide styphnate([Pb_(2)(CHZ)_(2)(TNR)_(2)(H_(2)O)_(2)])in N,N-dimethylformamide(DMF)at 298,15 K were studied by a SETARAM C80 calorime-ter.The results show that the dissolving process of them in DMF are exothermic,however the exothermic peaks are different.The results are associated with the different molecular structure and polarity of solutes.The empirical formulas for the enthalpies of dis-solution(△mH),the relative apparent molar enthalpies(ΦL;),the relative partial molar enthalpies(L,),and the enthalpies of di-lution(△aHt.:)are respectively deduced by polynomial fitting of experimental data.The standard enthalpies of dissolution(Aai H)are calculated respectively as-17.75kJ·mol^(-1),-29.76kJ·mol^(-1)and-15.35 kJ·mol^(-1).The rate constant of dissolution reaction(k),and the reaction order(n)are obtained from the kinetic formulas.
