A novel hybrid solar concentrating Photovoltaic/Thermal (CPV/T) system with beam splitting technique is presented. In this system, a beam splitter is used to separate the concentrated solar radiation into two parts: o...A novel hybrid solar concentrating Photovoltaic/Thermal (CPV/T) system with beam splitting technique is presented. In this system, a beam splitter is used to separate the concentrated solar radiation into two parts: one for the PV power generation and the other for thermal utility. The solar concentrator is a flat Fresnel-type concentrator with glass mirror reflectors. It can concentrate solar radiation onto solar cells with high uniformity, which is beneficial to improving the efficiency of solar cells. The thermal receiver is separated to the solar cells, and therefore, the thermal fluid can be heated to a relatively high temperature and does not affect the performance of solar cells. A dimensionless model was developed for the performance analysis of the concentrating system. The effects of the main parameters on the performance of the concentrator were analyzed. The beam splitter with coating materials Nb2O3 /SiO2 was designed by using the needle optimization technique, which can reflect about 71% of the undesired radiation for silicon cell(1.1m < 3m) to the thermal receiver for thermal utility. The performance of this CPV/T system was also theoretically analyzed.展开更多
Canine parvovirus type 2(CPV-2) infection is the most lethal disease of dogs with higher mortality in puppies worldwide.In today’s world,dogs are an integral part of our communities as well as dogs breeding and reari...Canine parvovirus type 2(CPV-2) infection is the most lethal disease of dogs with higher mortality in puppies worldwide.In today’s world,dogs are an integral part of our communities as well as dogs breeding and rearing has become a lucrative business.Therefore,a fast,accurate,portable,and costeffective CPV-2 detection method with the ability for on-site detection is highly desired.In this study,we for the first time proposed a nanosystem for CPV-2 DNA detection with RNA-guided RNA endonuclease Cas13 a,which upon activation results in collateral RNA degradation.We expressed LwCasl3 a in prokaryotic expression system and purified it through nickel column.Activity of Cas13 a was verified by RNA-bound fluorescent group while using a quenched fluorescent probe as signals.Further Cas13 a was combined with Recombinase polymerase amplification(RPA) and T7 transcription to establish molecular detection system termed specific high-sensitivity enzymatic reporter un-locking(SHERLOCK) for sensitive detection of CPV-2 DNA.This nanosystem can detect 100 amol/L CPV-2 DNA within 30 min.The proposed nanosystem exhibited high specificity when tested for CPV-2 and other dog viruses.This CRISPR-Cas13 a mediated sensitive detection approach can be of formidable advantage during CPV-2 outbreaks because it is time-efficient,less laborious and does not involve the use of sophisticated instruments.展开更多
By using the standard PMNS (Pontecorvo-Maki-Nakagawa-Sakata) mixing matrix and applying the rule for the sum of the oscillation probabilities of three neutrinos, the equations of motion were derived in which the Dirac...By using the standard PMNS (Pontecorvo-Maki-Nakagawa-Sakata) mixing matrix and applying the rule for the sum of the oscillation probabilities of three neutrinos, the equations of motion were derived in which the Dirac CP violating phase appeared as an unknown quantity. The equations of motion were separately derived for each of the three possible transitions for flavor-neutrino oscillations. Two roots of those equations were obtained in the form of two formulas for the Dirac CP violating phase with opposite signs. In the mathematical sense, the connection between those formulas was established in order to maintain the continuous process of oscillation of three neutrinos. This made it possible to calculate the numerical value for the Dirac CP violating phase, the Jarlskog invariant and to write the general form of the PMNS mixing matrix in the final form in which all its elements are defined with explicit numerical values.展开更多
基金supported by the National Basic Research Program of China ("973" Program), (Grantt No. 2010CB227305)the CAS Solar Energy Action Program (Grant No. CX2090130012)
文摘A novel hybrid solar concentrating Photovoltaic/Thermal (CPV/T) system with beam splitting technique is presented. In this system, a beam splitter is used to separate the concentrated solar radiation into two parts: one for the PV power generation and the other for thermal utility. The solar concentrator is a flat Fresnel-type concentrator with glass mirror reflectors. It can concentrate solar radiation onto solar cells with high uniformity, which is beneficial to improving the efficiency of solar cells. The thermal receiver is separated to the solar cells, and therefore, the thermal fluid can be heated to a relatively high temperature and does not affect the performance of solar cells. A dimensionless model was developed for the performance analysis of the concentrating system. The effects of the main parameters on the performance of the concentrator were analyzed. The beam splitter with coating materials Nb2O3 /SiO2 was designed by using the needle optimization technique, which can reflect about 71% of the undesired radiation for silicon cell(1.1m < 3m) to the thermal receiver for thermal utility. The performance of this CPV/T system was also theoretically analyzed.
基金supported by the National Key Research and Development Program of China (No.2017YFA0205301)National Natural Science Foundation of China (Nos.81902153,61527806 and 81430055)+2 种基金Key Research and Development Project of Jiangsu Province (No.BE2019761)Programs for Changjiang Scholars and Innovative Research Team in University (No.IRT_15R13)open Funding of State Key Laboratory of Oral Diseases (No.SKLOD20190F03)
文摘Canine parvovirus type 2(CPV-2) infection is the most lethal disease of dogs with higher mortality in puppies worldwide.In today’s world,dogs are an integral part of our communities as well as dogs breeding and rearing has become a lucrative business.Therefore,a fast,accurate,portable,and costeffective CPV-2 detection method with the ability for on-site detection is highly desired.In this study,we for the first time proposed a nanosystem for CPV-2 DNA detection with RNA-guided RNA endonuclease Cas13 a,which upon activation results in collateral RNA degradation.We expressed LwCasl3 a in prokaryotic expression system and purified it through nickel column.Activity of Cas13 a was verified by RNA-bound fluorescent group while using a quenched fluorescent probe as signals.Further Cas13 a was combined with Recombinase polymerase amplification(RPA) and T7 transcription to establish molecular detection system termed specific high-sensitivity enzymatic reporter un-locking(SHERLOCK) for sensitive detection of CPV-2 DNA.This nanosystem can detect 100 amol/L CPV-2 DNA within 30 min.The proposed nanosystem exhibited high specificity when tested for CPV-2 and other dog viruses.This CRISPR-Cas13 a mediated sensitive detection approach can be of formidable advantage during CPV-2 outbreaks because it is time-efficient,less laborious and does not involve the use of sophisticated instruments.
文摘By using the standard PMNS (Pontecorvo-Maki-Nakagawa-Sakata) mixing matrix and applying the rule for the sum of the oscillation probabilities of three neutrinos, the equations of motion were derived in which the Dirac CP violating phase appeared as an unknown quantity. The equations of motion were separately derived for each of the three possible transitions for flavor-neutrino oscillations. Two roots of those equations were obtained in the form of two formulas for the Dirac CP violating phase with opposite signs. In the mathematical sense, the connection between those formulas was established in order to maintain the continuous process of oscillation of three neutrinos. This made it possible to calculate the numerical value for the Dirac CP violating phase, the Jarlskog invariant and to write the general form of the PMNS mixing matrix in the final form in which all its elements are defined with explicit numerical values.
