β-Ga_(2)O_(3),as one of the important 4th generation semiconductors,is widely used in solar-blind ultraviolet(UV)detectors with a short detection range of 200-280 nm benefiting from its ultra-wide bandgap,strong radi...β-Ga_(2)O_(3),as one of the important 4th generation semiconductors,is widely used in solar-blind ultraviolet(UV)detectors with a short detection range of 200-280 nm benefiting from its ultra-wide bandgap,strong radiation resistance,and excellent chemical and thermal stabilities.Here,a self-powered photodetector(PD)based on an Ag/β-Ga_(2)O_(3) Schottky heterojunction was designed and fabricated.Through a subtle design of electrodes,the pyro-phototronic effect was discovered,which can be coupled to the common photovoltaic effect and further enhance the performance of the PD.Compared to traditional Ga_(2)O_(3)-based PD,the as-used PD exhibited a self-driving property and a broadband response beyond the bandgap lim-itations,ranging from 200 nm(deep UV)to 980 nm(infrared).Moreover,the photoresponse time was greatly shrunk owing to the coupling effect.Under laser irradiation,with a wavelength of 450 nm and a power density of 8 mW cm-2,the photocurrent could be improved by around 41 times compared with the sole photovoltaic effect.Besides,the performances of the Schottky PD were enhanced at both high and low temperatures.The device also possessed long-term working stability.This paper not only re-veals basic physics lying in the 4th generation semiconductor Ga_(2)O_(3) but also sheds light on the multi-encryption transmission of light information using this PD.展开更多
Background:To provide an understanding of important aspects of the participant recruitment and data collec-tion,become aware of any potential problems,and obtain necessary information in order to design a large-scale ...Background:To provide an understanding of important aspects of the participant recruitment and data collec-tion,become aware of any potential problems,and obtain necessary information in order to design a large-scale randomized controlled trial(RCT)for lung cancer and colorectal cancer(CRC)screening in China.Methods:This feasibility study was a multicentered,open-label,pilot randomized trial.A total of 2696 participants who were at high risk of lung cancer were recruited from three screening centers and randomly allocated to arm 1(n=894),annual low-dose computed tomography(LDCT)plus a baseline colonoscopy;arm 2(n=902),biennial LDCT plus annual fecal immunochemical test(FIT)with OC-Sensor(OC-FIT);and arm 3(n=900),annual Insure-FIT plus Septin 9 blood test.Information on randomization,compliance,positivity rate,cancer case detection,and contamination with screening for lung cancer and CRC were collected.Results:Participant characteristics were similar across study arms.The compliance rate of annual LDCT screening in arm 1 was 86.4%(95%CI:83.9%,88.5%)at baseline(T0),and 69.0%(95%CI:65.8%,72.0%)and 70.7%(95%CI:67.6%,73.7%)at the following two rounds(T1 and T2).The compliance rates of biennial LDCT screening in arm 2 were similar to those in arm 1 in the corresponding rounds.The compliance rate was 55.5%(95%CI:52.2%,58.8%)for colonoscopy in arm 1,while the compliance rates of OC-FIT,Insure-FIT,and the Septin 9 test in arms 2 and 3 were all approximately 90%at T0,decreasing to 65%-80%at T1 and T2.The positivity rate,cancer case detection rate,and contamination rate of screening for lung cancer and CRC were also reported.Conclusion:In this pilot study,the feasibility of an RCT in China of lung cancer and CRC screening was demon-strated.展开更多
Gallium nitride(GaN)-based ultraviolet(UV)photodetectors(PDs)are promising for advanced UV detection.However,the development faces challenges in cost reduction,process complexity,and the need for enhanced detection pe...Gallium nitride(GaN)-based ultraviolet(UV)photodetectors(PDs)are promising for advanced UV detection.However,the development faces challenges in cost reduction,process complexity,and the need for enhanced detection performance.In this study,an alternating current photovoltaic(AC PV)effect was identified in a GaN Schottky junction,achieving UV photoelectric responsivity improvements of up to two orders of magnitude and superior response speed compared to conventional photocurrent.Heating tests confirm PD stability at 600°C,attributable to the AC PV effect that maintains high response speed.Additionally,integrating a magnetically levitated structure with the UV PD enables a highly sensitive photoelectric wind speed sensor with an ultra-low startup wind speed of 0.5m/s and a rapid response time of 25.3 ms.This study offers a promising approach for fabricating high-performance UV photoelectric devices and precise monitoring in challenging environments.展开更多
The electrical conductivity of serpentine is measured at 1.0-3.0 GPa and 300-870℃. The effect of frequencies on electrical conductivity measurement is analyzed. The conduction mechanisms of serpentine before and afte...The electrical conductivity of serpentine is measured at 1.0-3.0 GPa and 300-870℃. The effect of frequencies on electrical conductivity measurement is analyzed. The conduction mechanisms of serpentine before and after dehydration are discussed. Our experimental results show that the electrical conductivity of serpentine increases significantly after展开更多
Introduction Submucosal tunneling endoscopic resection(STER)for the treatment of upper gastrointestinal submucosal tumors originating from the muscularis propria was first introduced by Xu et al.[1]in 2012.It has been...Introduction Submucosal tunneling endoscopic resection(STER)for the treatment of upper gastrointestinal submucosal tumors originating from the muscularis propria was first introduced by Xu et al.[1]in 2012.It has been demonstrated to be safe and effective for treating small(<3.5 cm)esophageal leiomyoma.However,sometimes the esophageal leiomyoma may be a giant mass and protrude into the mediastinum.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.52192610 and 52192613)the National Key R&D Project from the Minister of Science and Technology(No.2021YFA1201601)the CAS-TWAS President’s Fellow-ship(A.B).
文摘β-Ga_(2)O_(3),as one of the important 4th generation semiconductors,is widely used in solar-blind ultraviolet(UV)detectors with a short detection range of 200-280 nm benefiting from its ultra-wide bandgap,strong radiation resistance,and excellent chemical and thermal stabilities.Here,a self-powered photodetector(PD)based on an Ag/β-Ga_(2)O_(3) Schottky heterojunction was designed and fabricated.Through a subtle design of electrodes,the pyro-phototronic effect was discovered,which can be coupled to the common photovoltaic effect and further enhance the performance of the PD.Compared to traditional Ga_(2)O_(3)-based PD,the as-used PD exhibited a self-driving property and a broadband response beyond the bandgap lim-itations,ranging from 200 nm(deep UV)to 980 nm(infrared).Moreover,the photoresponse time was greatly shrunk owing to the coupling effect.Under laser irradiation,with a wavelength of 450 nm and a power density of 8 mW cm-2,the photocurrent could be improved by around 41 times compared with the sole photovoltaic effect.Besides,the performances of the Schottky PD were enhanced at both high and low temperatures.The device also possessed long-term working stability.This paper not only re-veals basic physics lying in the 4th generation semiconductor Ga_(2)O_(3) but also sheds light on the multi-encryption transmission of light information using this PD.
基金the National Natural Science Foundation of China(No. 81460561and 81360502)Guangxi Natural Science Foundation(No.2014GXNSFAA118225)+1 种基金the Program of Key Laboratory of High-Incidence-Tumor Prevention and Treatment(Guangxi Medical University),the Ministry of Education,China(No. GKE2018-09and GK2018-11)the Innovative Project of Postgraduate Majored in Biomedical Engineering, Guangxi Medical University (No. SG2018010).
文摘Background:To provide an understanding of important aspects of the participant recruitment and data collec-tion,become aware of any potential problems,and obtain necessary information in order to design a large-scale randomized controlled trial(RCT)for lung cancer and colorectal cancer(CRC)screening in China.Methods:This feasibility study was a multicentered,open-label,pilot randomized trial.A total of 2696 participants who were at high risk of lung cancer were recruited from three screening centers and randomly allocated to arm 1(n=894),annual low-dose computed tomography(LDCT)plus a baseline colonoscopy;arm 2(n=902),biennial LDCT plus annual fecal immunochemical test(FIT)with OC-Sensor(OC-FIT);and arm 3(n=900),annual Insure-FIT plus Septin 9 blood test.Information on randomization,compliance,positivity rate,cancer case detection,and contamination with screening for lung cancer and CRC were collected.Results:Participant characteristics were similar across study arms.The compliance rate of annual LDCT screening in arm 1 was 86.4%(95%CI:83.9%,88.5%)at baseline(T0),and 69.0%(95%CI:65.8%,72.0%)and 70.7%(95%CI:67.6%,73.7%)at the following two rounds(T1 and T2).The compliance rates of biennial LDCT screening in arm 2 were similar to those in arm 1 in the corresponding rounds.The compliance rate was 55.5%(95%CI:52.2%,58.8%)for colonoscopy in arm 1,while the compliance rates of OC-FIT,Insure-FIT,and the Septin 9 test in arms 2 and 3 were all approximately 90%at T0,decreasing to 65%-80%at T1 and T2.The positivity rate,cancer case detection rate,and contamination rate of screening for lung cancer and CRC were also reported.Conclusion:In this pilot study,the feasibility of an RCT in China of lung cancer and CRC screening was demon-strated.
基金supported by the Beijing Natural Science Foundation(L247036)the National Natural Science Foundation of China(62574025,52192610 and 52192613)the National Key R&D Project from Ministry of Science and Technology(2021YFA1201601).
文摘Gallium nitride(GaN)-based ultraviolet(UV)photodetectors(PDs)are promising for advanced UV detection.However,the development faces challenges in cost reduction,process complexity,and the need for enhanced detection performance.In this study,an alternating current photovoltaic(AC PV)effect was identified in a GaN Schottky junction,achieving UV photoelectric responsivity improvements of up to two orders of magnitude and superior response speed compared to conventional photocurrent.Heating tests confirm PD stability at 600°C,attributable to the AC PV effect that maintains high response speed.Additionally,integrating a magnetically levitated structure with the UV PD enables a highly sensitive photoelectric wind speed sensor with an ultra-low startup wind speed of 0.5m/s and a rapid response time of 25.3 ms.This study offers a promising approach for fabricating high-performance UV photoelectric devices and precise monitoring in challenging environments.
文摘The electrical conductivity of serpentine is measured at 1.0-3.0 GPa and 300-870℃. The effect of frequencies on electrical conductivity measurement is analyzed. The conduction mechanisms of serpentine before and after dehydration are discussed. Our experimental results show that the electrical conductivity of serpentine increases significantly after
文摘Introduction Submucosal tunneling endoscopic resection(STER)for the treatment of upper gastrointestinal submucosal tumors originating from the muscularis propria was first introduced by Xu et al.[1]in 2012.It has been demonstrated to be safe and effective for treating small(<3.5 cm)esophageal leiomyoma.However,sometimes the esophageal leiomyoma may be a giant mass and protrude into the mediastinum.
