Photonuclear data are increasingly used in fundamental nuclear research and technological applications.These data are generated using advanced γ-ray sources.The Shanghai laser electron gamma source(SLEGS)is a new las...Photonuclear data are increasingly used in fundamental nuclear research and technological applications.These data are generated using advanced γ-ray sources.The Shanghai laser electron gamma source(SLEGS)is a new laser Compton scattering γ-ray source at the Shanghai Synchrotron Radiation Facility.It delivers energy-tunable,quasi-monoenergetic gamma beams for high-precision photonuclear measurements.This paper presents the flat-efficiency detector(FED)array at SLEGS and its application in photoneutron cross-section measurements.Systematic uncertainties of the FED array were determined to be 3.02%through calibration with a ^(252)Cf neutron source.Using ^(197)Au and ^(159)Tb as representative nuclei,we demonstrate the format and processing methodology for raw photoneutron data.The results validate SLEGS’capability for high-precision photoneutron measurements.展开更多
Amyotrophic lateral sclerosis is a rare neurodegenerative disease characterized by the involvement of both upper and lower motor neurons.Early bilateral limb involvement significantly affects patients'daily lives ...Amyotrophic lateral sclerosis is a rare neurodegenerative disease characterized by the involvement of both upper and lower motor neurons.Early bilateral limb involvement significantly affects patients'daily lives and may lead them to be confined to bed.However,the effect of upper and lower motor neuron impairment and other risk factors on bilateral limb involvement is unclear.To address this issue,we retrospectively collected data from 586 amyotrophic lateral sclerosis patients with limb onset diagnosed at Peking University Third Hospital between January 2020 and May 2022.A univariate analysis revealed no significant differences in the time intervals of spread in different directions between individuals with upper motor neuron-dominant amyotrophic lateral sclerosis and those with classic amyotrophic lateral sclerosis.We used causal directed acyclic graphs for risk factor determination and Cox proportional hazards models to investigate the association between the duration of bilateral limb involvement and clinical baseline characteristics in amyotrophic lateral sclerosis patients.Multiple factor analyses revealed that higher upper motor neuron scores(hazard ratio[HR]=1.05,95%confidence interval[CI]=1.01–1.09,P=0.018),onset in the left limb(HR=0.72,95%CI=0.58–0.89,P=0.002),and a horizontal pattern of progression(HR=0.46,95%CI=0.37–0.58,P<0.001)were risk factors for a shorter interval until bilateral limb involvement.The results demonstrated that a greater degree of upper motor neuron involvement might cause contralateral limb involvement to progress more quickly in limb-onset amyotrophic lateral sclerosis patients.These findings may improve the management of amyotrophic lateral sclerosis patients with limb onset and the prediction of patient prognosis.展开更多
To overcome the difficulty and high cost of some specific isotopic targets,a substitution method was proposed to measure the cross section of the(γ,n)reactions.Considering that the natural copper element(^(nat)Cu)onl...To overcome the difficulty and high cost of some specific isotopic targets,a substitution method was proposed to measure the cross section of the(γ,n)reactions.Considering that the natural copper element(^(nat)Cu)only has^(63)Cu and^(65)Cu isotopes,the^(65)Cu(γ,n)^(64)Cu reaction was taken as an example to test the substitution method.Using quasi-monoenergeticγbeams provided by the Shanghai Laser Electron Gamma Source(SLEGS)of the Shanghai Synchrotron Radiation Facility(SSRF),^(nat)Cu(γ,n)was measured from E_(γ)=11.09 MeV to 17.87 MeV.Furthermore,based on the^(63)Cu(γ,n)reaction measured using the same experimental setup at SLEGS,^(65)Cu(γ,n)^(64)Cu was extracted using the substitution method.The abundance variation of natural copper,showing a significant influence on the cross section,was also investigated.The results were compared to the existing experimental data measured by bremsstrahlung and positron annihilation in-flight sources,and the TALYS 2.0 predictions.Theγstrength function(γSF)of^(65)Cu was obtained from the^(65)Cu(γ,n)data,and the reaction cross section of^(64)Cu(n,γ)was further calculated.展开更多
We present new data on the^(63)Cu(γ,n)cross-section studied using a quasi-monochromatic and energy-tunableγbeam produced at the Shanghai Laser Electron Gamma Source to resolve the long-standing discrepancy between e...We present new data on the^(63)Cu(γ,n)cross-section studied using a quasi-monochromatic and energy-tunableγbeam produced at the Shanghai Laser Electron Gamma Source to resolve the long-standing discrepancy between existing measurements and evaluations of this cross-section.Using an unfolding iteration method,^(63)Cu(γ,n)data were obtained with an uncertainty of less than 4%,and the inconsistencies between the available experimental data were discussed.Theγ-ray strength function of^(63)Cu(γ,n)was successfully extracted as an experimental constraint.We further calculated the cross-section of the radiative neutron capture reaction^(62)Cu(n,γ)using the TALYS code.Our calculation method enables the extraction of(n,γ)cross-sections for unstable nuclides.展开更多
The accurate photoneutron cross section of the^(27)Al nucleus has a significant impact on resolving differences in existing experimental data and enhancing the precision of nuclear reaction rate calculations for^(26)A...The accurate photoneutron cross section of the^(27)Al nucleus has a significant impact on resolving differences in existing experimental data and enhancing the precision of nuclear reaction rate calculations for^(26)Al in nuclear astrophysics.The photoneutron cross sections for the^(27)Al(γ,n)^(26)Al reaction,within the neutron separation energy range of 13.2-21.7 MeV,were meticulously measured using a new flat efficiency detector array at the Shanghai Laser-Electron Gamma Source.The uncertainty of the data was controlled to below 4%throughout the process,and inconsistencies between the present data and existing data from different gamma sources,as well as the TENDL-2021 data,are discussed in detail.These discussions provide a valuable reference for addressing discrepancies in the^(27)Al(γ,n)^(26)Al cross-section data and improving related theoretical calculations.展开更多
Correction to:Nuclear Science and Techniques(2025)36:66 https://doi.org/10.1007/s41365-025-01662-y.In this article,the author’s name Hui-Ling Wei was incorrectly written as Hui-Ling We.The original article has been c...Correction to:Nuclear Science and Techniques(2025)36:66 https://doi.org/10.1007/s41365-025-01662-y.In this article,the author’s name Hui-Ling Wei was incorrectly written as Hui-Ling We.The original article has been corrected.展开更多
Objective To review published literatures comparing the safety and effectiveness of retroperitoneal laparoscopic partial nephrectomy(RLPN) with transperitoneal laparoscopic partial nephrectomy(TLPN) and provide refere...Objective To review published literatures comparing the safety and effectiveness of retroperitoneal laparoscopic partial nephrectomy(RLPN) with transperitoneal laparoscopic partial nephrectomy(TLPN) and provide reference for clinical work. Methods The search strategy was performed to identify relevant papers from the Cochrane Central Register of Controlled Trials, EMBASE, MEDLINE, Google Scholar, China Hospital Knowledge Database, Wangfang Chinese Periodical Database, and VIP Chinese Periodical Database. All papers comparing RLPN with TLPN were included from 2000 to 2015. Two to three reviewers independently screened, evaluated, and extracted the included papers. A Meta-analysis was executed by using Review Manager 5.3 software. The interesting outcomes were tumor size, operating time, estimated blood loss, warm ischaemia time, length of hospital stay, positive margin rate, open conversion rate, overall complication rate, and recurrence rate. Results The literature search obtained 378 papers, then 10 of them were ultimately met the inclusion criteria and included in the systematic review. Finally, 6 of the 10 papers were included in the Meta-analysis. RLPN had significantly less operating time [P = 0.01, mean difference(MD)=-33.68, 95% confidence interval(CI) within(-60.35,-7.01)] and shorter length of hospital stay [P < 0.0001, MD=-1.47, 95% CI within(-2.18,-0.76)] than TLPN. Significant differences were not found between RLPN and TLPN in other outcomes. Conclusions RLPN may be equally safe and be faster than TLPN. Each center can choose a modality according to your own operating habits and experience.展开更多
Geological reports are a significant accomplishment for geologists involved in geological investigations and scientific research as they contain rich data and textual information.With the rapid development of science ...Geological reports are a significant accomplishment for geologists involved in geological investigations and scientific research as they contain rich data and textual information.With the rapid development of science and technology,a large number of textual reports have accumulated in the field of geology.However,many non-hot topics and non-English speaking regions are neglected in mainstream geoscience databases for geological information mining,making it more challenging for some researchers to extract necessary information from these texts.Natural Language Processing(NLP)has obvious advantages in processing large amounts of textual data.The objective of this paper is to identify geological named entities from Chinese geological texts using NLP techniques.We propose the RoBERTa-Prompt-Tuning-NER method,which leverages the concept of Prompt Learning and requires only a small amount of annotated data to train superior models for recognizing geological named entities in low-resource dataset configurations.The RoBERTa layer captures context-based information and longer-distance dependencies through dynamic word vectors.Finally,we conducted experiments on the constructed Geological Named Entity Recognition(GNER)dataset.Our experimental results show that the proposed model achieves the highest F1 score of 80.64%among the four baseline algorithms,demonstrating the reliability and robustness of using the model for Named Entity Recognition of geological texts.展开更多
The Shanghai Laser Electron Gamma Source(SLEGS),built in the Shanghai Synchrotron Radiation Facility,is the first versatile laser Compton slant-scatterin am e in the world.The measurements of 197Au(c,1n)and 159Tb(c,1n...The Shanghai Laser Electron Gamma Source(SLEGS),built in the Shanghai Synchrotron Radiation Facility,is the first versatile laser Compton slant-scatterin am e in the world.The measurements of 197Au(c,1n)and 159Tb(c,1n)reaction cross sections were chosen as the day-one experiment at SLEGS.The SLEGS data are compared with data from the Livermore and Saclay positron annihilation in-flight facilities and with data from the NewSUBARU laser Compton backscattering facility.Our data evidence discrepancies with the results from Livermore and Saclay,while demonstrating consistency with the data from NewSUBARU.This is also consistent with new theoretical predictions.The new measurement lays the foundation for resolving the long-standing discrepancies between the Livermore and Saclay photoneutron cross section data for 19 nuclei in the future.Gamma-ray beams produced at SLEGS await a variety of experiments for nuclear physics,astrophysics and nuclear data as well as for industrial applications.展开更多
基金supported by National Key Research and Development Program of China(Nos.2022YFA1602404 and 2023YFA1606901)the National Natural Science Foundation of China(Nos.12275338,12388102,and U2441221)the Key Laboratory of Nuclear Data Foundation(JCKY2022201C152).
文摘Photonuclear data are increasingly used in fundamental nuclear research and technological applications.These data are generated using advanced γ-ray sources.The Shanghai laser electron gamma source(SLEGS)is a new laser Compton scattering γ-ray source at the Shanghai Synchrotron Radiation Facility.It delivers energy-tunable,quasi-monoenergetic gamma beams for high-precision photonuclear measurements.This paper presents the flat-efficiency detector(FED)array at SLEGS and its application in photoneutron cross-section measurements.Systematic uncertainties of the FED array were determined to be 3.02%through calibration with a ^(252)Cf neutron source.Using ^(197)Au and ^(159)Tb as representative nuclei,we demonstrate the format and processing methodology for raw photoneutron data.The results validate SLEGS’capability for high-precision photoneutron measurements.
基金supported by the National Natural Science Foundation of China,Nos.82071426,81873784Clinical Cohort Construction Program of Peking University Third Hospital,No.BYSYDL2019002(all to DF)。
文摘Amyotrophic lateral sclerosis is a rare neurodegenerative disease characterized by the involvement of both upper and lower motor neurons.Early bilateral limb involvement significantly affects patients'daily lives and may lead them to be confined to bed.However,the effect of upper and lower motor neuron impairment and other risk factors on bilateral limb involvement is unclear.To address this issue,we retrospectively collected data from 586 amyotrophic lateral sclerosis patients with limb onset diagnosed at Peking University Third Hospital between January 2020 and May 2022.A univariate analysis revealed no significant differences in the time intervals of spread in different directions between individuals with upper motor neuron-dominant amyotrophic lateral sclerosis and those with classic amyotrophic lateral sclerosis.We used causal directed acyclic graphs for risk factor determination and Cox proportional hazards models to investigate the association between the duration of bilateral limb involvement and clinical baseline characteristics in amyotrophic lateral sclerosis patients.Multiple factor analyses revealed that higher upper motor neuron scores(hazard ratio[HR]=1.05,95%confidence interval[CI]=1.01–1.09,P=0.018),onset in the left limb(HR=0.72,95%CI=0.58–0.89,P=0.002),and a horizontal pattern of progression(HR=0.46,95%CI=0.37–0.58,P<0.001)were risk factors for a shorter interval until bilateral limb involvement.The results demonstrated that a greater degree of upper motor neuron involvement might cause contralateral limb involvement to progress more quickly in limb-onset amyotrophic lateral sclerosis patients.These findings may improve the management of amyotrophic lateral sclerosis patients with limb onset and the prediction of patient prognosis.
基金supported by the National key R&D program(Nos.2022YFA1602404 and 2023YFA1606901)the National Natural Science Foundation of China(Nos.12375123 and 12388102)the Natural Science Foundation of Henan Province(No.242300422048).
文摘To overcome the difficulty and high cost of some specific isotopic targets,a substitution method was proposed to measure the cross section of the(γ,n)reactions.Considering that the natural copper element(^(nat)Cu)only has^(63)Cu and^(65)Cu isotopes,the^(65)Cu(γ,n)^(64)Cu reaction was taken as an example to test the substitution method.Using quasi-monoenergeticγbeams provided by the Shanghai Laser Electron Gamma Source(SLEGS)of the Shanghai Synchrotron Radiation Facility(SSRF),^(nat)Cu(γ,n)was measured from E_(γ)=11.09 MeV to 17.87 MeV.Furthermore,based on the^(63)Cu(γ,n)reaction measured using the same experimental setup at SLEGS,^(65)Cu(γ,n)^(64)Cu was extracted using the substitution method.The abundance variation of natural copper,showing a significant influence on the cross section,was also investigated.The results were compared to the existing experimental data measured by bremsstrahlung and positron annihilation in-flight sources,and the TALYS 2.0 predictions.Theγstrength function(γSF)of^(65)Cu was obtained from the^(65)Cu(γ,n)data,and the reaction cross section of^(64)Cu(n,γ)was further calculated.
基金supported by the National Key Research and Development Program(Nos.2023YFA1606901 and 2022YFA1602400)National Natural Science Foundation of China(Nos.U2230133,12275338,and 12388102)Open Fund of the CIAE Key Laboratory of Nuclear Data(No.JCKY2022201C152).
文摘We present new data on the^(63)Cu(γ,n)cross-section studied using a quasi-monochromatic and energy-tunableγbeam produced at the Shanghai Laser Electron Gamma Source to resolve the long-standing discrepancy between existing measurements and evaluations of this cross-section.Using an unfolding iteration method,^(63)Cu(γ,n)data were obtained with an uncertainty of less than 4%,and the inconsistencies between the available experimental data were discussed.Theγ-ray strength function of^(63)Cu(γ,n)was successfully extracted as an experimental constraint.We further calculated the cross-section of the radiative neutron capture reaction^(62)Cu(n,γ)using the TALYS code.Our calculation method enables the extraction of(n,γ)cross-sections for unstable nuclides.
基金supported by the National key R&D program(Nos.2023YFA1606901 and 2022YFA1602404)the National Natural Science Foundation of China(Nos.12375123 and 12388102)the Natural Science Foundation of Henan Province(No.242300422048)。
文摘The accurate photoneutron cross section of the^(27)Al nucleus has a significant impact on resolving differences in existing experimental data and enhancing the precision of nuclear reaction rate calculations for^(26)Al in nuclear astrophysics.The photoneutron cross sections for the^(27)Al(γ,n)^(26)Al reaction,within the neutron separation energy range of 13.2-21.7 MeV,were meticulously measured using a new flat efficiency detector array at the Shanghai Laser-Electron Gamma Source.The uncertainty of the data was controlled to below 4%throughout the process,and inconsistencies between the present data and existing data from different gamma sources,as well as the TENDL-2021 data,are discussed in detail.These discussions provide a valuable reference for addressing discrepancies in the^(27)Al(γ,n)^(26)Al cross-section data and improving related theoretical calculations.
文摘Correction to:Nuclear Science and Techniques(2025)36:66 https://doi.org/10.1007/s41365-025-01662-y.In this article,the author’s name Hui-Ling Wei was incorrectly written as Hui-Ling We.The original article has been corrected.
基金Supported by the Science and Technology Plans of Shaoxing Science and Technology Bureau,China(2010D10014)
文摘Objective To review published literatures comparing the safety and effectiveness of retroperitoneal laparoscopic partial nephrectomy(RLPN) with transperitoneal laparoscopic partial nephrectomy(TLPN) and provide reference for clinical work. Methods The search strategy was performed to identify relevant papers from the Cochrane Central Register of Controlled Trials, EMBASE, MEDLINE, Google Scholar, China Hospital Knowledge Database, Wangfang Chinese Periodical Database, and VIP Chinese Periodical Database. All papers comparing RLPN with TLPN were included from 2000 to 2015. Two to three reviewers independently screened, evaluated, and extracted the included papers. A Meta-analysis was executed by using Review Manager 5.3 software. The interesting outcomes were tumor size, operating time, estimated blood loss, warm ischaemia time, length of hospital stay, positive margin rate, open conversion rate, overall complication rate, and recurrence rate. Results The literature search obtained 378 papers, then 10 of them were ultimately met the inclusion criteria and included in the systematic review. Finally, 6 of the 10 papers were included in the Meta-analysis. RLPN had significantly less operating time [P = 0.01, mean difference(MD)=-33.68, 95% confidence interval(CI) within(-60.35,-7.01)] and shorter length of hospital stay [P < 0.0001, MD=-1.47, 95% CI within(-2.18,-0.76)] than TLPN. Significant differences were not found between RLPN and TLPN in other outcomes. Conclusions RLPN may be equally safe and be faster than TLPN. Each center can choose a modality according to your own operating habits and experience.
基金supported by the National Natural Science Foundation of China(Nos.42488201,42172137,42050104,and 42050102)the National Key R&D Program of China(No.2023YFF0804000)Sichuan Provincial Youth Science&Technology Innovative Research Group Fund(No.2022JDTD0004)
文摘Geological reports are a significant accomplishment for geologists involved in geological investigations and scientific research as they contain rich data and textual information.With the rapid development of science and technology,a large number of textual reports have accumulated in the field of geology.However,many non-hot topics and non-English speaking regions are neglected in mainstream geoscience databases for geological information mining,making it more challenging for some researchers to extract necessary information from these texts.Natural Language Processing(NLP)has obvious advantages in processing large amounts of textual data.The objective of this paper is to identify geological named entities from Chinese geological texts using NLP techniques.We propose the RoBERTa-Prompt-Tuning-NER method,which leverages the concept of Prompt Learning and requires only a small amount of annotated data to train superior models for recognizing geological named entities in low-resource dataset configurations.The RoBERTa layer captures context-based information and longer-distance dependencies through dynamic word vectors.Finally,we conducted experiments on the constructed Geological Named Entity Recognition(GNER)dataset.Our experimental results show that the proposed model achieves the highest F1 score of 80.64%among the four baseline algorithms,demonstrating the reliability and robustness of using the model for Named Entity Recognition of geological texts.
基金supported by the National key R&D program(2022YFA1602400 and 2023YFA1606901)the Science Fund for Creative Research Groups(12388102)+1 种基金the National Natural Science Foundation of China(12147101,12275338,12005280)the Key Laboratory of Nuclear Data Foundation(JCKY2022201C152).
文摘The Shanghai Laser Electron Gamma Source(SLEGS),built in the Shanghai Synchrotron Radiation Facility,is the first versatile laser Compton slant-scatterin am e in the world.The measurements of 197Au(c,1n)and 159Tb(c,1n)reaction cross sections were chosen as the day-one experiment at SLEGS.The SLEGS data are compared with data from the Livermore and Saclay positron annihilation in-flight facilities and with data from the NewSUBARU laser Compton backscattering facility.Our data evidence discrepancies with the results from Livermore and Saclay,while demonstrating consistency with the data from NewSUBARU.This is also consistent with new theoretical predictions.The new measurement lays the foundation for resolving the long-standing discrepancies between the Livermore and Saclay photoneutron cross section data for 19 nuclei in the future.Gamma-ray beams produced at SLEGS await a variety of experiments for nuclear physics,astrophysics and nuclear data as well as for industrial applications.
