Remaining useful life(RUL) estimation based on condition monitoring data is central to condition based maintenance(CBM). In the current methods about the Wiener process based RUL estimation, the randomness of the fail...Remaining useful life(RUL) estimation based on condition monitoring data is central to condition based maintenance(CBM). In the current methods about the Wiener process based RUL estimation, the randomness of the failure threshold has not been studied thoroughly. In this work, by using the truncated normal distribution to model random failure threshold(RFT), an analytical and closed-form RUL distribution based on the current observed data was derived considering the posterior distribution of the drift parameter. Then, the Bayesian method was used to update the prior estimation of failure threshold. To solve the uncertainty of the censored in situ data of failure threshold, the expectation maximization(EM) algorithm is used to calculate the posteriori estimation of failure threshold. Numerical examples show that considering the randomness of the failure threshold and updating the prior information of RFT could improve the accuracy of real time RUL estimation.展开更多
Because of the toxic effects of plasticizers, mainly the phthalate DEHP, the Children＇s Hospital Kinderklinik Glanzing in Vienna, Austria started in 2000 replacing PVC-containing medical devices by PVC-free material....Because of the toxic effects of plasticizers, mainly the phthalate DEHP, the Children＇s Hospital Kinderklinik Glanzing in Vienna, Austria started in 2000 replacing PVC-containing medical devices by PVC-free material. After analysis of suspected PVC-containing medical products a PVC input-output balance was established. Through linkage with the consumption data PVC-containing articles could be identified. PVC-free alternatives for medical use were searched as well by literature research as by questioning the manufactures. Then medical producers were asked to confirm PVC free articles. PVC content of invasive medical products could be reduced from 343 kg and 14.6 % weight in 2001 to 178 kg and 7.6% weight in 2010.展开更多
In optical performance monitoring system,the analog to digital converter is needed to detect the peak of nanosecond pulse and get the signal envelope.A scheme based on a designed anti-aliasing filter and analog to dig...In optical performance monitoring system,the analog to digital converter is needed to detect the peak of nanosecond pulse and get the signal envelope.A scheme based on a designed anti-aliasing filter and analog to digital converter is proposed to broaden the nanosecond pulse and make it easier for the analog to digital converter to catch the peak of the nanosecond pulse.The experimental results demonstrate that,with the proposed scheme,the optical performance system needs less time to get the recovered eye-diagram of high speed optical data signal,and is robust to phase mismatch in the analog to digital converter circuit.展开更多
The applicability of a gold nanoparticle-modified glassy carbon sensor （AuNPs-GCS） for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry （SW-ASV） is d...The applicability of a gold nanoparticle-modified glassy carbon sensor （AuNPs-GCS） for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry （SW-ASV） is demonstrated. Mercury content in sample Tuna Fish ISPRA T22 was determined to value the accuracy of the determination. The concentration in this sample is not certified, so, the Hg amount was determined also with atomic absorption spectroscopy （AAS）： the results obtained with ASV were in good agreement and confirmed literature value reported for this sample. Then, real samples of tuna fish were analyzed. The voltammetric analyses were performed using previously optimized conditions （deposition potential 0 V, step potential 0.004 V, frequency 150 Hz and amplitude 0.003 V）. Medium exchange technique permitted to eliminate possible matrix effects. The concentrations in the real samples were found to be in agreement with the common Hg levels reported in literature for commercialized tuna fish in different countries.展开更多
Engineering nano-materials & their impact on human health or environmental security constitute a newly emerging R&D hot spot and a key problem now urgently waiting for its solution in supporting the sustainabi...Engineering nano-materials & their impact on human health or environmental security constitute a newly emerging R&D hot spot and a key problem now urgently waiting for its solution in supporting the sustainability of China's nano-science and related technology development. At present, water bodies in Chinese cities have been seriously polluted by metallic nano-particles (MNPs) while related monitoring data are found woefully lacking throughout the country. Based on the above understanding, this article gives a round-up explanation on distributive characteristics of MNPs in the river mouths or water bodies of Chinese cities, their ecological hazards as well as our research in this regard, providing some inspiring ideas and data for control over this scourge. In addition, our exploration probes the discharge traits of MNPs themselves and the mechanism underlying its impact on water pollution.展开更多
Herein, a multiwalled carbon nanotubes(MWNT)-based colorimetric probe was designed to discover and monitor the level of apolipoprotein-L1(Apo L1) in lumbar disc herniation(LDH) patients. Apo L1 could be easily found i...Herein, a multiwalled carbon nanotubes(MWNT)-based colorimetric probe was designed to discover and monitor the level of apolipoprotein-L1(Apo L1) in lumbar disc herniation(LDH) patients. Apo L1 could be easily found in human serum of the LDH group, but not obviously expressed in the normal control group(Ctrl), spine spondylolisthesis(SSP) group, spinal fracture(SFR) group, and spine scoliosis(SSC) group. Furthermore, the as-prepared MWNT-based probe was also used to track the recovery of LDH patients who have successful surgery operation. The P value of early diagnosis and recovery monitoring was <0.001 and >0.05 for the proposed method and a conventional enzyme-linked immunosorbent assay(ELISA), respectively, suggesting this detection strategy had significant differences compared with the traditional ELISA. All experimental results showed that Apo L1 might be a potential biomarker for early diagnosis of LDH. This proposed detection strategy has a potential application in discovering new biomarkers of diseases.展开更多
基金Projects(51475462,61174030,61473094,61374126)supported by the National Natural Science Foundation of China
文摘Remaining useful life(RUL) estimation based on condition monitoring data is central to condition based maintenance(CBM). In the current methods about the Wiener process based RUL estimation, the randomness of the failure threshold has not been studied thoroughly. In this work, by using the truncated normal distribution to model random failure threshold(RFT), an analytical and closed-form RUL distribution based on the current observed data was derived considering the posterior distribution of the drift parameter. Then, the Bayesian method was used to update the prior estimation of failure threshold. To solve the uncertainty of the censored in situ data of failure threshold, the expectation maximization(EM) algorithm is used to calculate the posteriori estimation of failure threshold. Numerical examples show that considering the randomness of the failure threshold and updating the prior information of RFT could improve the accuracy of real time RUL estimation.
文摘Because of the toxic effects of plasticizers, mainly the phthalate DEHP, the Children＇s Hospital Kinderklinik Glanzing in Vienna, Austria started in 2000 replacing PVC-containing medical devices by PVC-free material. After analysis of suspected PVC-containing medical products a PVC input-output balance was established. Through linkage with the consumption data PVC-containing articles could be identified. PVC-free alternatives for medical use were searched as well by literature research as by questioning the manufactures. Then medical producers were asked to confirm PVC free articles. PVC content of invasive medical products could be reduced from 343 kg and 14.6 % weight in 2001 to 178 kg and 7.6% weight in 2010.
基金supported by National 863 Program of China(2013AA013401),P.R.ChinaNational Natural Science Foundation of China under Grant No.61177067,No.61027007,and No.61331010
文摘In optical performance monitoring system,the analog to digital converter is needed to detect the peak of nanosecond pulse and get the signal envelope.A scheme based on a designed anti-aliasing filter and analog to digital converter is proposed to broaden the nanosecond pulse and make it easier for the analog to digital converter to catch the peak of the nanosecond pulse.The experimental results demonstrate that,with the proposed scheme,the optical performance system needs less time to get the recovered eye-diagram of high speed optical data signal,and is robust to phase mismatch in the analog to digital converter circuit.
文摘The applicability of a gold nanoparticle-modified glassy carbon sensor （AuNPs-GCS） for the determination of inorganic mercury in fresh and canned tuna fish by square wave anodic stripping voltammetry （SW-ASV） is demonstrated. Mercury content in sample Tuna Fish ISPRA T22 was determined to value the accuracy of the determination. The concentration in this sample is not certified, so, the Hg amount was determined also with atomic absorption spectroscopy （AAS）： the results obtained with ASV were in good agreement and confirmed literature value reported for this sample. Then, real samples of tuna fish were analyzed. The voltammetric analyses were performed using previously optimized conditions （deposition potential 0 V, step potential 0.004 V, frequency 150 Hz and amplitude 0.003 V）. Medium exchange technique permitted to eliminate possible matrix effects. The concentrations in the real samples were found to be in agreement with the common Hg levels reported in literature for commercialized tuna fish in different countries.
文摘Engineering nano-materials & their impact on human health or environmental security constitute a newly emerging R&D hot spot and a key problem now urgently waiting for its solution in supporting the sustainability of China's nano-science and related technology development. At present, water bodies in Chinese cities have been seriously polluted by metallic nano-particles (MNPs) while related monitoring data are found woefully lacking throughout the country. Based on the above understanding, this article gives a round-up explanation on distributive characteristics of MNPs in the river mouths or water bodies of Chinese cities, their ecological hazards as well as our research in this regard, providing some inspiring ideas and data for control over this scourge. In addition, our exploration probes the discharge traits of MNPs themselves and the mechanism underlying its impact on water pollution.
基金supported by the National Basic Research Program of China(2012CB933301)the Key Discipline Construction Project of Pudong Health Bureau of Shanghai(PWZx2014-02)+1 种基金the Sci-tech Support Plan of Jiangsu Province(BE2014719)the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘Herein, a multiwalled carbon nanotubes(MWNT)-based colorimetric probe was designed to discover and monitor the level of apolipoprotein-L1(Apo L1) in lumbar disc herniation(LDH) patients. Apo L1 could be easily found in human serum of the LDH group, but not obviously expressed in the normal control group(Ctrl), spine spondylolisthesis(SSP) group, spinal fracture(SFR) group, and spine scoliosis(SSC) group. Furthermore, the as-prepared MWNT-based probe was also used to track the recovery of LDH patients who have successful surgery operation. The P value of early diagnosis and recovery monitoring was <0.001 and >0.05 for the proposed method and a conventional enzyme-linked immunosorbent assay(ELISA), respectively, suggesting this detection strategy had significant differences compared with the traditional ELISA. All experimental results showed that Apo L1 might be a potential biomarker for early diagnosis of LDH. This proposed detection strategy has a potential application in discovering new biomarkers of diseases.
