Positron sources are one of the most important components of the injector of a circular electron positron collector(CEPC).The CEPC is designed as an e^(+)e^(−)collider for a Higgs factory.Its accelerator system is com...Positron sources are one of the most important components of the injector of a circular electron positron collector(CEPC).The CEPC is designed as an e^(+)e^(−)collider for a Higgs factory.Its accelerator system is composed of 100-km-long storage rings and an injector.The design goal of the positron source is to obtain positron beams with a bunch charge of 3 nC.The flux concentrator(FC)is one of the cores of the positron source.This paper reports the design,development,and measurements of an FC prototype system.The prototype includes an FC and an all-solid-state high-current pulse modulator.Preliminary tests show that the peak current on the FC can reach 15.5 kA,and the peak magnetic field can reach 6.2 T.The test results are consistent with the theoretical simulation.The FC system fulfills the requirements of the CEPC positron source as well as provides a reference for the development of similar devices both domestically and abroad.展开更多
Protein sources are the second most important component in poultry diets.Due to the fluctuation in price of soybean meal(SBM) and persistent increase in feed prices,nutritionists have been exploring alternative protei...Protein sources are the second most important component in poultry diets.Due to the fluctuation in price of soybean meal(SBM) and persistent increase in feed prices,nutritionists have been exploring alternative protein sources.Replacement of SBM with alternative protein sources in poultry diets could reduce human-live stock competition for soybean and support the production of more animal protein.However,the use of alternative protein sources is limited to low inclusion due to the presence of antinutritional factors(ANF) such as glucosinolates(rapeseed meal),gossypol(cottonseed meal),nonstarch polysaccharides(NSP) in lupin flour,high fibre(palm kernel cake),total phenolic contents and phytic acid(canola meal) known to impair animal performance,nutrient digestibility and feed utilization.As a processing technique,solid-state fermentation(SSF) has been researched for a long time in the food industry.An important objective of SSF is the production of enzymes,organic acids and other metabolites of economic importance.In recent times,SSF has been employed to enhance nutrient bioavailability,inhibit gut pathogenic bacteria and reduce ANF in plant protein sources resulting in improved nutrient digestibility,thereby improving performance and gut health of broiler chickens.Unlike pigs,there is still a dearth of information on feeding solid-state fermented feed ingredients to broiler chickens.This review aims to describe the nutritional value of the solid-state fermented products of rapeseed meal,canola meal,cottonseed meal,palm kernel cake and lupin flour on performance and intestinal health of broiler chickens.展开更多
In the quest to realize a scalable quantum network,semiconductor quantum dots(QDs)offer distinct advantages,including high single-photon efficiency and indistinguishability,high repetition rate(tens of gigahertz with ...In the quest to realize a scalable quantum network,semiconductor quantum dots(QDs)offer distinct advantages,including high single-photon efficiency and indistinguishability,high repetition rate(tens of gigahertz with Purcell enhancement),interconnectivity with spin qubits,and a scalable on-chip platform.However,in the past two decades,the visibility of quantum interference between independent QDs rarely went beyond the classical limit of 50%,and the distances were limited from a few meters to kilometers.Here,we report quantum interference between two single photons from independent QDs separated by a 302 km optical fiber.The single photons are generated from resonantly driven single QDs deterministically coupled to microcavities.Quantum frequency conversions are used to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunication band.The observed interference visibility is 0.670.02(0.930.04)without(with)temporal filtering.Feasible improvements can further extend the distance to∼600 km.Our work represents a key step to long-distance solid-state quantum networks.展开更多
The phase and frequency locking of microwave, millimeter wave power combining were analysed and summarized in an all-round way. The master/slave phase locking of cavity oscillators, the peer phase locking of mutually ...The phase and frequency locking of microwave, millimeter wave power combining were analysed and summarized in an all-round way. The master/slave phase locking of cavity oscillators, the peer phase locking of mutually coupled oscillators, and the peer phase locking of ring-connected multiple oscillators were investigated. The results of numerical calculations, and the relations of phase to phase locking model and oscillator parameters were given. And the cavity and space power combining aspects for microwave and millimeter wave were presented.展开更多
基金This work was supported by the National Key Programme for S&T Research and Development(No.2016YFA0400400)the Youth Innovation Promotion Association CAS(2019016).
文摘Positron sources are one of the most important components of the injector of a circular electron positron collector(CEPC).The CEPC is designed as an e^(+)e^(−)collider for a Higgs factory.Its accelerator system is composed of 100-km-long storage rings and an injector.The design goal of the positron source is to obtain positron beams with a bunch charge of 3 nC.The flux concentrator(FC)is one of the cores of the positron source.This paper reports the design,development,and measurements of an FC prototype system.The prototype includes an FC and an all-solid-state high-current pulse modulator.Preliminary tests show that the peak current on the FC can reach 15.5 kA,and the peak magnetic field can reach 6.2 T.The test results are consistent with the theoretical simulation.The FC system fulfills the requirements of the CEPC positron source as well as provides a reference for the development of similar devices both domestically and abroad.
基金the support of the University of Queensland,Brisbane,AustraliaThe scholarship support through the Australian Government Research Training Program Scholarship.
文摘Protein sources are the second most important component in poultry diets.Due to the fluctuation in price of soybean meal(SBM) and persistent increase in feed prices,nutritionists have been exploring alternative protein sources.Replacement of SBM with alternative protein sources in poultry diets could reduce human-live stock competition for soybean and support the production of more animal protein.However,the use of alternative protein sources is limited to low inclusion due to the presence of antinutritional factors(ANF) such as glucosinolates(rapeseed meal),gossypol(cottonseed meal),nonstarch polysaccharides(NSP) in lupin flour,high fibre(palm kernel cake),total phenolic contents and phytic acid(canola meal) known to impair animal performance,nutrient digestibility and feed utilization.As a processing technique,solid-state fermentation(SSF) has been researched for a long time in the food industry.An important objective of SSF is the production of enzymes,organic acids and other metabolites of economic importance.In recent times,SSF has been employed to enhance nutrient bioavailability,inhibit gut pathogenic bacteria and reduce ANF in plant protein sources resulting in improved nutrient digestibility,thereby improving performance and gut health of broiler chickens.Unlike pigs,there is still a dearth of information on feeding solid-state fermented feed ingredients to broiler chickens.This review aims to describe the nutritional value of the solid-state fermented products of rapeseed meal,canola meal,cottonseed meal,palm kernel cake and lupin flour on performance and intestinal health of broiler chickens.
基金the National Natural Science Foundation of China(91836303)the National Key R&D Program of China(2019YFA0308700)+1 种基金the Chinese Academy of Sciences,the Anhui Initiative in Quantum Information Technologies,the Natural Science Foundation of Shandong Province(ZR2020LLZ007)the ShanghaiMunicipal Science and Technology Major Project(2019SHZDZX01).
文摘In the quest to realize a scalable quantum network,semiconductor quantum dots(QDs)offer distinct advantages,including high single-photon efficiency and indistinguishability,high repetition rate(tens of gigahertz with Purcell enhancement),interconnectivity with spin qubits,and a scalable on-chip platform.However,in the past two decades,the visibility of quantum interference between independent QDs rarely went beyond the classical limit of 50%,and the distances were limited from a few meters to kilometers.Here,we report quantum interference between two single photons from independent QDs separated by a 302 km optical fiber.The single photons are generated from resonantly driven single QDs deterministically coupled to microcavities.Quantum frequency conversions are used to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunication band.The observed interference visibility is 0.670.02(0.930.04)without(with)temporal filtering.Feasible improvements can further extend the distance to∼600 km.Our work represents a key step to long-distance solid-state quantum networks.
基金Supported by the National Natural Science Foundation of China
文摘The phase and frequency locking of microwave, millimeter wave power combining were analysed and summarized in an all-round way. The master/slave phase locking of cavity oscillators, the peer phase locking of mutually coupled oscillators, and the peer phase locking of ring-connected multiple oscillators were investigated. The results of numerical calculations, and the relations of phase to phase locking model and oscillator parameters were given. And the cavity and space power combining aspects for microwave and millimeter wave were presented.
