Launched on December 28,2016,the Super View-1 satellite has operated for over 70 days at an altitude of 530km.The initial results of in-orbit commissioning show that the images from the Super View-1 satellite are clea...Launched on December 28,2016,the Super View-1 satellite has operated for over 70 days at an altitude of 530km.The initial results of in-orbit commissioning show that the images from the Super View-1 satellite are clear with radiation resolution reaching 11 bits pixel.The geospatial positioning accuracy without ground control pointing is5-8 m,the elevation relative accuracy is1 m.The maximum single scene can be60 km×70 km,enabling some 900。展开更多
Dr. Elaine M. Leshe of the recently published in the （Roggenbeck et al., 2016）, Henderson Award from the University of Alberta, who has Journal of Environmental Sciences is the recipient of the V. E. Society of Tox...Dr. Elaine M. Leshe of the recently published in the （Roggenbeck et al., 2016）, Henderson Award from the University of Alberta, who has Journal of Environmental Sciences is the recipient of the V. E. Society of Toxicology of Canada. ＂The award is designed to honour an individual who has made a significant contribution to the discipline of toxicology in Canada＂. （STC, 2016）展开更多
Dr. Samuel M. Cohen of the University of Nebraska Medical Center, who has recently published in the Journal of Environmental Sciences （Cohen et al., 2016）, is the recipient of the Merit Award from the Society of Tox...Dr. Samuel M. Cohen of the University of Nebraska Medical Center, who has recently published in the Journal of Environmental Sciences （Cohen et al., 2016）, is the recipient of the Merit Award from the Society of Toxicology （USA）. ＂The Merit Award is presented to a member of the Society of Toxicology in recognition of distinguished contributions to toxicology throughout an entire career in areas such as research, teaching, regulatory activities, consulting and service to the Society＂ （SOT, 2016a）. Dr. Cohen is professor at the University of Nebraska Medical Center, Omaha, Nebraska. He serves in the Depart- ment of Pathology and Microbiology, as well as the Eppley Institute for Research in Cancer. He also is staff pathologist with Nebraska Medicine, the Nebraska Orthopedics Hospital in Omaha. and the Bellevue Medical Center.展开更多
ZTE Corporation announced in September 2008 that its WiMAX 16e system passed Mobile WiMAX certification testing by the WiMAX Forum. This is another milestone
On November 3,CIIS President Su Ge and Vice President Dong Manyuan met with the delegation from the Danish Parliament headed by Soren Espersen,Chairman of its Foreign Policy Committee.The two sides exchanged views on ...On November 3,CIIS President Su Ge and Vice President Dong Manyuan met with the delegation from the Danish Parliament headed by Soren Espersen,Chairman of its Foreign Policy Committee.The two sides exchanged views on China-Europe relations and the DPRK nuclear issue,among other topics.Members of the delegation included展开更多
CHEN Yushun,an expert on aquaculture and aquatic ecosystems from the Institute of Hydrobiology,Chinese Academy of Sciences,received the Distinguished Service Award on August 23,2017 at the American Fisheries Society(A...CHEN Yushun,an expert on aquaculture and aquatic ecosystems from the Institute of Hydrobiology,Chinese Academy of Sciences,received the Distinguished Service Award on August 23,2017 at the American Fisheries Society(AFS)Annual Meeting in Tampa,Florida.The Distinguished Service Award recognizes outstanding contributions of time and energy for展开更多
The work of principal investigators （PIs） at the Institute of Neuroscience （ION） under the CAS Shanghai Institutes for Biological Sciences was applauded by an international evaluation panel that convened on June 9...The work of principal investigators （PIs） at the Institute of Neuroscience （ION） under the CAS Shanghai Institutes for Biological Sciences was applauded by an international evaluation panel that convened on June 9 and 10 at ION.展开更多
Adelegation led by CASC President Ma Xingrui visited Turkmenistan on August 8. President of Turkmenistan Gurbanguly Berdimuhamedov received the delegation in a warm, friendly atmosphere. President Gurbanguly Berdimuha...Adelegation led by CASC President Ma Xingrui visited Turkmenistan on August 8. President of Turkmenistan Gurbanguly Berdimuhamedov received the delegation in a warm, friendly atmosphere. President Gurbanguly Berdimuhamedov highly praised the remarkable achievements of China in the past 50 years. He said that展开更多
This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signa...This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning accuracy.Managed by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude regions.Ina-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast Asia.We provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this network.We generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific research.Two preliminary findings from the ROTI maps of Ina-CORS are noteworthy.First,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther eastward.Second,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East Asia.We have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,2024.We observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities post-midnight.By sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionospheric research.展开更多
The Red Sea-Gulf of Suez-Cairo-Alexandria Clysmic-Trend in northern Egypt is the main earthquake zone in the country,with a moderate-to-high seismic hazard and a history of significant earthquakes caused by rifting an...The Red Sea-Gulf of Suez-Cairo-Alexandria Clysmic-Trend in northern Egypt is the main earthquake zone in the country,with a moderate-to-high seismic hazard and a history of significant earthquakes caused by rifting and active faulting.To improve our understanding of the tectonic and seismic processes in this area,more comprehensive imaging of the crustal structure is required.This can be achieved by increasing the number of receiver functions(RFs)recorded by the seismic stations in northern Egypt and the southeastern Mediterranean.Data handling and processing should also be automated to increase process efficiency.In this study,we developed a capsule neural network for automated selection of RFs.The model was trained on a dataset containing RFs(both selected and unselected)from five broadband stations in northern Egypt.Stations SLM,SIWA,KOT,NBNS,and NKL are located in the unstable shelf region of Egypt,where limited knowledge of the deep crustal structure is available.The proposed capsule neural network achieved an average precision of 80%on the test set.The automated selection of RFs using a capsule neural network has the potential to significantly improve the efficiency and accuracy of RF analysis,as demonstrated by the stacking test.This could lead to a better understanding of crustal structure and tectonic processes in northern Egypt and the southeastern Mediterranean.展开更多
In DSP-based SerDes application,it is essential for AFE to implement a pre-ADC equalization to provide a better sig-nal for ADC and DSP.To meet the various equalization requirements of different channel and transmitte...In DSP-based SerDes application,it is essential for AFE to implement a pre-ADC equalization to provide a better sig-nal for ADC and DSP.To meet the various equalization requirements of different channel and transmitter configurations,this paper presents a 112 Gbps DSP-Based PAM4 SerDes receiver with a wide band equalization tuning AFE.The AFE is realized by implementing source degeneration transconductance,feedforward high-pass branch and inductive feedback peaking TIA.The AFE offers a flexible equalization gain tuning of up to 17.5 dB at Nyquist frequency without affecting the DC gain.With the pro-posed AFE,the receiver demonstrates eye opening after digital FIR equalization and achieves 6×10^(-9) BER with a 29.6 dB inser-tion loss channel.展开更多
A Receiver Operating Characteristic(ROC)analysis of a power is important and useful in clinical trials.A Classical Conditional Power(CCP)is a probability of a classical rejection region given values of true treatment ...A Receiver Operating Characteristic(ROC)analysis of a power is important and useful in clinical trials.A Classical Conditional Power(CCP)is a probability of a classical rejection region given values of true treatment effect and interim result.For hypotheses and reversed hypotheses under normal models,we obtain analytical expressions of the ROC curves of the CCP,find optimal ROC curves of the CCP,investigate the superiority of the ROC curves of the CCP,calculate critical values of the False Positive Rate(FPR),True Positive Rate(TPR),and cutoff of the optimal CCP,and give go/no go decisions at the interim of the optimal CCP.In addition,extensive numerical experiments are carried out to exemplify our theoretical results.Finally,a real data example is performed to illustrate the go/no go decisions of the optimal CCP.展开更多
Construction of LNG receiving terminals The scale of receiving terminals is expanding rapidly At the end of 1999,the state approved the Guangdong LNG Pilot Project,which opened the prelude to the construction of LNG r...Construction of LNG receiving terminals The scale of receiving terminals is expanding rapidly At the end of 1999,the state approved the Guangdong LNG Pilot Project,which opened the prelude to the construction of LNG receiving terminals.In 2006,China's first LNG receiving terminal,namely Dapeng LNG Receiving Terminal in Shenzhen,Guangdong Province,was put into operation,marking the beginning of the use of overseas natural gas in China.展开更多
The objective of this study is to establish a thermodynamic model of an ORC(organic Rankine cycle)for power electricity.A case study was proposed in an area where direct solar irradiation is abundant.The number of hel...The objective of this study is to establish a thermodynamic model of an ORC(organic Rankine cycle)for power electricity.A case study was proposed in an area where direct solar irradiation is abundant.The number of heliostats used in the system as a function of the DNI(direct normal irradiation)was studied.The efficiencies of ORC and receiver,the power of turbine,pump,evaporator and receiver as a function of thermodynamic parameters such as temperature,pressure at the level of different components of the system are studied.The results obtained show that the number of heliostats used decreases when the DNI increases.For a DNI of 700 W/m^(2) to 500 W/m^(2),the number of heliostats goes from 280 to 60.ORC efficiency and turbine power increase respectively from 11%to 22%and from 20 kW to 50 kW when the condenser temperature decreases.Also it is noted an increase of receiver efficiency when evaporator temperature increases.展开更多
The geodetic detrending(GD)methodology was introduced in the past decade and has opened the door to the global monitoring of ionospheric scintillation using global navigation satellite system(GNSS)receivers.The perfor...The geodetic detrending(GD)methodology was introduced in the past decade and has opened the door to the global monitoring of ionospheric scintillation using global navigation satellite system(GNSS)receivers.The performance of GD has been demonstrated in geodetic receivers.However,extending scintillation monitoring to low-cost commercial receivers remains a challenge.Low-cost devices could serve as valuable complements to specialised and much more expensive scintillation monitoring receivers.In this paper,first,a feasibility study was conducted using the GD technique,demonstrating that the scintillation indices derived from the observations of two lowcost receivers(Septentrio Mosaic X5 and UBLOX ZED-F9P)have a resolution similar to that achieved by geodetic receiver models,whose price is one order of magnitude higher.Second,measurements of GNSS signals at different frequencies from the Galileo and global positioning system(GPS)satellites were analysed in a specific experiment over six days of null scintillation.Next,the noise level in the scintillation parameters derived from the experiment was evaluated,which shows that for low-cost receivers,the minimum scintillation detection threshold increases only negligibly compared to geodetic-grade receivers.Moreover,the geometry-free(GF)combination of L1 with a second signal of different frequency was investigated as an alternative to detrending GNSS signals.Finally,for determining the ionospheric fluctuations produced by scintillation,the limitations of using the GF combination versus the uncombined measurements were highlighted.It is concluded that the minimum resolution of scintillation indices derived from low-cost receiver measurements makes it possible to distinguish values associated with periods of scintillation activity from those produced by residual noise from mismodeling.For both geodetic and low-cost receivers,the scintillation detection threshold obtained with uncombined carrier-phase measurements is smaller than that achieved with the classic GF combination.展开更多
Orbital angular momentum(OAM)can achieve multifold increase of spectrum efficiency,but the hollow divergence characteristic and Line-of-Sight(LoS)path requirement impose the crucial challenges for vortex wave communic...Orbital angular momentum(OAM)can achieve multifold increase of spectrum efficiency,but the hollow divergence characteristic and Line-of-Sight(LoS)path requirement impose the crucial challenges for vortex wave communications.For air-to-ground vortex wave communications,where there exists the LoS path,this paper proposes a multi-user cooperative receive(MUCR)scheme to break through the communication distance limitation caused by the characteristic of vortex wave hollow divergence.In particular,we derive the optimal radial position corresponding to the maximum intensity,which is used to adjust the waist radius.Based on the waist radius and energy ring,the cooperative ground users having the minimum angular square difference are selected.Also,the signal compensation scheme is proposed to decompose OAM signals in air-to-ground vortex wave communications.Simulation results are presented to verify the superiority of our proposed MUCR scheme.展开更多
Huashan Hospital Clinical Laboratory, Shanghai, China, has been awarded an accreditation by the Commission on Laboratory Accreditation of the College of American Pathologists （CAP）, based on the results of a recent ...Huashan Hospital Clinical Laboratory, Shanghai, China, has been awarded an accreditation by the Commission on Laboratory Accreditation of the College of American Pathologists （CAP）, based on the results of a recent on-site inspection.展开更多
BACKGROUND Emerging evidence suggests that serum levels of pepsinogen(PG),gastrin-17(G17),carcinoembryonic antigen(CEA),carbohydrate antigen 19-9(CA19-9),and CA72-4 may aid in distinguishing gastric cancer(GC)from gas...BACKGROUND Emerging evidence suggests that serum levels of pepsinogen(PG),gastrin-17(G17),carcinoembryonic antigen(CEA),carbohydrate antigen 19-9(CA19-9),and CA72-4 may aid in distinguishing gastric cancer(GC)from gastric ulcer(GU).AIM To assess serum PG,G17,CEA,CA19-9,and CA72-4 in diagnosing GU and optimizing GC detection.METHODS A retrospective analysis was conducted from 263 patients treated at the Third People’s Hospital of Hefei,who were classified into three groups:Chronic non-atrophic gastritis(CG),GU,and GC.Fasting serum levels of PG,G17,CEA,CA19-9,and CA72-4 were measured and compared across the groups.RESULTS Serum levels of PGII and G17 were significantly elevated in both the GU and GC groups compared to the CG group(P<0.01),whereas the PGI/PGII ratio was markedly decreased(P<0.01).Levels of CEA,CA19-9,and CA72-4 were significantly higher in the GC group than in the CG and GU groups(P<0.01).Receiver operating characteristic curve analysis identified the optimal diagnostic cut-off values for GU and GC as follows:PGI(169.855 pmol/L),PGII(30.555μg/L),PGI/PGII ratio(16.529),G17(6.435 pmol/L),CEA(2.005 ng/mL),CA19-9(16.65 U/mL),and CA72-4(2.075 U/mL).The area under the curve for combined detection was 0.826(P<0.001),indicating good diagnostic performance.CONCLUSION Serological biomarkers effectively distinguish GC from GU,with combined detection of PGII,PGI/PGII ratio,G17,and tumor markers enhancing diagnostic accuracy.展开更多
The Rydberg atom-based receiver, as a novel type of antenna, demonstrates broad application prospects in the field of microwave communications. However, since Rydberg atomic receivers are nonlinear systems, mismatches...The Rydberg atom-based receiver, as a novel type of antenna, demonstrates broad application prospects in the field of microwave communications. However, since Rydberg atomic receivers are nonlinear systems, mismatches between the parameters of the received amplitude modulation(AM) signals and the system's linear workspace and demodulation operating points can cause severe distortion in the demodulated signals. To address this, the article proposes a method for determining the operational parameters based on the mean square error(MSE) and total harmonic distortion(THD) assessments and presents strategies for optimizing the system's operational parameters focusing on linear response characteristics(LRC) and linear dynamic range(LDR). Specifically, we employ a method that minimizes the MSE to define the system's linear workspace, thereby ensuring the system has a good LRC while maximizing the LDR. To ensure that the signal always operates within the linear workspace, an appropriate carrier amplitude is set as the demodulation operating point. By calculating the THD at different operating points, the LRC performance within different regions of the linear workspace is evaluated, and corresponding optimization strategies based on the range of signal strengths are proposed. Moreover, to more accurately restore the baseband signal, we establish a mapping relationship between the carrier Rabi frequency and the transmitted power of the probe light, and optimize the slope of the linear demodulation function to reduce the MSE to less than 0.8×10^(-4). Finally, based on these methods for determining the operational parameters, we explore the effects of different laser Rabi frequencies on the system performance, and provide optimization recommendations. This research provides robust support for the design of high-performance Rydberg atom-based AM receivers.展开更多
文摘Launched on December 28,2016,the Super View-1 satellite has operated for over 70 days at an altitude of 530km.The initial results of in-orbit commissioning show that the images from the Super View-1 satellite are clear with radiation resolution reaching 11 bits pixel.The geospatial positioning accuracy without ground control pointing is5-8 m,the elevation relative accuracy is1 m.The maximum single scene can be60 km×70 km,enabling some 900。
文摘Dr. Elaine M. Leshe of the recently published in the （Roggenbeck et al., 2016）, Henderson Award from the University of Alberta, who has Journal of Environmental Sciences is the recipient of the V. E. Society of Toxicology of Canada. ＂The award is designed to honour an individual who has made a significant contribution to the discipline of toxicology in Canada＂. （STC, 2016）
文摘Dr. Samuel M. Cohen of the University of Nebraska Medical Center, who has recently published in the Journal of Environmental Sciences （Cohen et al., 2016）, is the recipient of the Merit Award from the Society of Toxicology （USA）. ＂The Merit Award is presented to a member of the Society of Toxicology in recognition of distinguished contributions to toxicology throughout an entire career in areas such as research, teaching, regulatory activities, consulting and service to the Society＂ （SOT, 2016a）. Dr. Cohen is professor at the University of Nebraska Medical Center, Omaha, Nebraska. He serves in the Depart- ment of Pathology and Microbiology, as well as the Eppley Institute for Research in Cancer. He also is staff pathologist with Nebraska Medicine, the Nebraska Orthopedics Hospital in Omaha. and the Bellevue Medical Center.
文摘ZTE Corporation announced in September 2008 that its WiMAX 16e system passed Mobile WiMAX certification testing by the WiMAX Forum. This is another milestone
文摘On November 3,CIIS President Su Ge and Vice President Dong Manyuan met with the delegation from the Danish Parliament headed by Soren Espersen,Chairman of its Foreign Policy Committee.The two sides exchanged views on China-Europe relations and the DPRK nuclear issue,among other topics.Members of the delegation included
文摘CHEN Yushun,an expert on aquaculture and aquatic ecosystems from the Institute of Hydrobiology,Chinese Academy of Sciences,received the Distinguished Service Award on August 23,2017 at the American Fisheries Society(AFS)Annual Meeting in Tampa,Florida.The Distinguished Service Award recognizes outstanding contributions of time and energy for
文摘The work of principal investigators （PIs） at the Institute of Neuroscience （ION） under the CAS Shanghai Institutes for Biological Sciences was applauded by an international evaluation panel that convened on June 9 and 10 at ION.
文摘The Chinese government will earmark 4.8 billion yuan (or US$ 615.4 million) in the next five years for improving the infrastructure facilities at CAS.
文摘Adelegation led by CASC President Ma Xingrui visited Turkmenistan on August 8. President of Turkmenistan Gurbanguly Berdimuhamedov received the delegation in a warm, friendly atmosphere. President Gurbanguly Berdimuhamedov highly praised the remarkable achievements of China in the past 50 years. He said that
基金JSPS KAKENHI Grant Number16H06286 supports global GNSS ionospheric maps (TEC,ROTI,and detrended TEC maps) developed by the Institute for SpaceEarth Environmental Research (ISEE) of Nagoya Universitysupport of the 2024 JASSO Follow-up Research Fellowship Program for a 90-day visiting research at the Institute for Space-Earth Environmental Research (ISEE),Nagoya University+3 种基金the support received from Telkom University under the“Skema Penelitian Terapan Periode I Tahun Anggaran 2024”the Memorandum of Understanding for Research Collaboration on Regional Ionospheric Observation (No:092/SAM3/TE-DEK/2021)the National Institute of Information and Communications Technology (NICT) International Exchange Program 2024-2025(No.2024-007)support for a one-year visiting research at Hokkaido University
文摘This paper highlights the crucial role of Indonesia’s GNSS receiver network in advancing Equatorial Plasma Bubble(EPB)studies in Southeast and East Asia,as ionospheric irregularities within EPB can disrupt GNSS signals and degrade positioning accuracy.Managed by the Indonesian Geospatial Information Agency(BIG),the Indonesia Continuously Operating Reference Station(Ina-CORS)network comprises over 300 GNSS receivers spanning equatorial to southern low-latitude regions.Ina-CORS is uniquely situated to monitor EPB generation,zonal drift,and dissipation across Southeast Asia.We provide a practical tool for EPB research,by sharing two-dimensional rate of Total Electron Content(TEC)change index(ROTI)derived from this network.We generate ROTI maps with a 10-minute resolution,and samples from May 2024 are publicly available for further scientific research.Two preliminary findings from the ROTI maps of Ina-CORS are noteworthy.First,the Ina-CORS ROTI maps reveal that the irregularities within a broader EPB structure persist longer,increasing the potential for these irregularities to migrate farther eastward.Second,we demonstrate that combined ROTI maps from Ina-CORS and GNSS receivers in East Asia and Australia can be used to monitor the development of ionospheric irregularities in Southeast and East Asia.We have demonstrated the combined ROTI maps to capture the development of ionospheric irregularities in the Southeast/East Asian sector during the G5 Geomagnetic Storm on May 11,2024.We observed simultaneous ionospheric irregularities in Japan and Australia,respectively propagating northwestward and southwestward,before midnight,whereas Southeast Asia’s equatorial and low-latitude regions exhibited irregularities post-midnight.By sharing ROTI maps from Indonesia and integrating them with regional GNSS networks,researchers can conduct comprehensive EPB studies,enhancing the understanding of EPB behavior across Southeast and East Asia and contributing significantly to ionospheric research.
文摘The Red Sea-Gulf of Suez-Cairo-Alexandria Clysmic-Trend in northern Egypt is the main earthquake zone in the country,with a moderate-to-high seismic hazard and a history of significant earthquakes caused by rifting and active faulting.To improve our understanding of the tectonic and seismic processes in this area,more comprehensive imaging of the crustal structure is required.This can be achieved by increasing the number of receiver functions(RFs)recorded by the seismic stations in northern Egypt and the southeastern Mediterranean.Data handling and processing should also be automated to increase process efficiency.In this study,we developed a capsule neural network for automated selection of RFs.The model was trained on a dataset containing RFs(both selected and unselected)from five broadband stations in northern Egypt.Stations SLM,SIWA,KOT,NBNS,and NKL are located in the unstable shelf region of Egypt,where limited knowledge of the deep crustal structure is available.The proposed capsule neural network achieved an average precision of 80%on the test set.The automated selection of RFs using a capsule neural network has the potential to significantly improve the efficiency and accuracy of RF analysis,as demonstrated by the stacking test.This could lead to a better understanding of crustal structure and tectonic processes in northern Egypt and the southeastern Mediterranean.
基金supported by National Key R&D Program of China No.2022YFB2803401.
文摘In DSP-based SerDes application,it is essential for AFE to implement a pre-ADC equalization to provide a better sig-nal for ADC and DSP.To meet the various equalization requirements of different channel and transmitter configurations,this paper presents a 112 Gbps DSP-Based PAM4 SerDes receiver with a wide band equalization tuning AFE.The AFE is realized by implementing source degeneration transconductance,feedforward high-pass branch and inductive feedback peaking TIA.The AFE offers a flexible equalization gain tuning of up to 17.5 dB at Nyquist frequency without affecting the DC gain.With the pro-posed AFE,the receiver demonstrates eye opening after digital FIR equalization and achieves 6×10^(-9) BER with a 29.6 dB inser-tion loss channel.
基金supported by the National Social Science Fund of China(Grand No.21XTJ001).
文摘A Receiver Operating Characteristic(ROC)analysis of a power is important and useful in clinical trials.A Classical Conditional Power(CCP)is a probability of a classical rejection region given values of true treatment effect and interim result.For hypotheses and reversed hypotheses under normal models,we obtain analytical expressions of the ROC curves of the CCP,find optimal ROC curves of the CCP,investigate the superiority of the ROC curves of the CCP,calculate critical values of the False Positive Rate(FPR),True Positive Rate(TPR),and cutoff of the optimal CCP,and give go/no go decisions at the interim of the optimal CCP.In addition,extensive numerical experiments are carried out to exemplify our theoretical results.Finally,a real data example is performed to illustrate the go/no go decisions of the optimal CCP.
文摘Construction of LNG receiving terminals The scale of receiving terminals is expanding rapidly At the end of 1999,the state approved the Guangdong LNG Pilot Project,which opened the prelude to the construction of LNG receiving terminals.In 2006,China's first LNG receiving terminal,namely Dapeng LNG Receiving Terminal in Shenzhen,Guangdong Province,was put into operation,marking the beginning of the use of overseas natural gas in China.
文摘The objective of this study is to establish a thermodynamic model of an ORC(organic Rankine cycle)for power electricity.A case study was proposed in an area where direct solar irradiation is abundant.The number of heliostats used in the system as a function of the DNI(direct normal irradiation)was studied.The efficiencies of ORC and receiver,the power of turbine,pump,evaporator and receiver as a function of thermodynamic parameters such as temperature,pressure at the level of different components of the system are studied.The results obtained show that the number of heliostats used decreases when the DNI increases.For a DNI of 700 W/m^(2) to 500 W/m^(2),the number of heliostats goes from 280 to 60.ORC efficiency and turbine power increase respectively from 11%to 22%and from 20 kW to 50 kW when the condenser temperature decreases.Also it is noted an increase of receiver efficiency when evaporator temperature increases.
基金funding from European Union(MCIN/AEI/10.13039/501100011033/FEDER)(Nos.PID2022-138485OB-I00 and CNS2022-135383)European Space Agency(RT-WMIS)(No.4000137762/22/NL/GLC/ov)funding support from the China Scholarship Council(No.202006020025)。
文摘The geodetic detrending(GD)methodology was introduced in the past decade and has opened the door to the global monitoring of ionospheric scintillation using global navigation satellite system(GNSS)receivers.The performance of GD has been demonstrated in geodetic receivers.However,extending scintillation monitoring to low-cost commercial receivers remains a challenge.Low-cost devices could serve as valuable complements to specialised and much more expensive scintillation monitoring receivers.In this paper,first,a feasibility study was conducted using the GD technique,demonstrating that the scintillation indices derived from the observations of two lowcost receivers(Septentrio Mosaic X5 and UBLOX ZED-F9P)have a resolution similar to that achieved by geodetic receiver models,whose price is one order of magnitude higher.Second,measurements of GNSS signals at different frequencies from the Galileo and global positioning system(GPS)satellites were analysed in a specific experiment over six days of null scintillation.Next,the noise level in the scintillation parameters derived from the experiment was evaluated,which shows that for low-cost receivers,the minimum scintillation detection threshold increases only negligibly compared to geodetic-grade receivers.Moreover,the geometry-free(GF)combination of L1 with a second signal of different frequency was investigated as an alternative to detrending GNSS signals.Finally,for determining the ionospheric fluctuations produced by scintillation,the limitations of using the GF combination versus the uncombined measurements were highlighted.It is concluded that the minimum resolution of scintillation indices derived from low-cost receiver measurements makes it possible to distinguish values associated with periods of scintillation activity from those produced by residual noise from mismodeling.For both geodetic and low-cost receivers,the scintillation detection threshold obtained with uncombined carrier-phase measurements is smaller than that achieved with the classic GF combination.
基金supported in part by National Natural Science Foundation of China under Grant 62441115 and 62201427in part by the Ministry of Industry and Information Technology of the People’s Republic of China under Grant CBG01N23-01-04.
文摘Orbital angular momentum(OAM)can achieve multifold increase of spectrum efficiency,but the hollow divergence characteristic and Line-of-Sight(LoS)path requirement impose the crucial challenges for vortex wave communications.For air-to-ground vortex wave communications,where there exists the LoS path,this paper proposes a multi-user cooperative receive(MUCR)scheme to break through the communication distance limitation caused by the characteristic of vortex wave hollow divergence.In particular,we derive the optimal radial position corresponding to the maximum intensity,which is used to adjust the waist radius.Based on the waist radius and energy ring,the cooperative ground users having the minimum angular square difference are selected.Also,the signal compensation scheme is proposed to decompose OAM signals in air-to-ground vortex wave communications.Simulation results are presented to verify the superiority of our proposed MUCR scheme.
文摘Huashan Hospital Clinical Laboratory, Shanghai, China, has been awarded an accreditation by the Commission on Laboratory Accreditation of the College of American Pathologists （CAP）, based on the results of a recent on-site inspection.
基金Supported by Chinese Medicine Research Project of Anhui Chinese Medicine Society,No.2024ZYYXH135.
文摘BACKGROUND Emerging evidence suggests that serum levels of pepsinogen(PG),gastrin-17(G17),carcinoembryonic antigen(CEA),carbohydrate antigen 19-9(CA19-9),and CA72-4 may aid in distinguishing gastric cancer(GC)from gastric ulcer(GU).AIM To assess serum PG,G17,CEA,CA19-9,and CA72-4 in diagnosing GU and optimizing GC detection.METHODS A retrospective analysis was conducted from 263 patients treated at the Third People’s Hospital of Hefei,who were classified into three groups:Chronic non-atrophic gastritis(CG),GU,and GC.Fasting serum levels of PG,G17,CEA,CA19-9,and CA72-4 were measured and compared across the groups.RESULTS Serum levels of PGII and G17 were significantly elevated in both the GU and GC groups compared to the CG group(P<0.01),whereas the PGI/PGII ratio was markedly decreased(P<0.01).Levels of CEA,CA19-9,and CA72-4 were significantly higher in the GC group than in the CG and GU groups(P<0.01).Receiver operating characteristic curve analysis identified the optimal diagnostic cut-off values for GU and GC as follows:PGI(169.855 pmol/L),PGII(30.555μg/L),PGI/PGII ratio(16.529),G17(6.435 pmol/L),CEA(2.005 ng/mL),CA19-9(16.65 U/mL),and CA72-4(2.075 U/mL).The area under the curve for combined detection was 0.826(P<0.001),indicating good diagnostic performance.CONCLUSION Serological biomarkers effectively distinguish GC from GU,with combined detection of PGII,PGI/PGII ratio,G17,and tumor markers enhancing diagnostic accuracy.
基金Project supported by the National Natural Science Foundation of China (Grant No. U22B2095)the Civil Aerospace Technology Research Project (Grant No. D010103)。
文摘The Rydberg atom-based receiver, as a novel type of antenna, demonstrates broad application prospects in the field of microwave communications. However, since Rydberg atomic receivers are nonlinear systems, mismatches between the parameters of the received amplitude modulation(AM) signals and the system's linear workspace and demodulation operating points can cause severe distortion in the demodulated signals. To address this, the article proposes a method for determining the operational parameters based on the mean square error(MSE) and total harmonic distortion(THD) assessments and presents strategies for optimizing the system's operational parameters focusing on linear response characteristics(LRC) and linear dynamic range(LDR). Specifically, we employ a method that minimizes the MSE to define the system's linear workspace, thereby ensuring the system has a good LRC while maximizing the LDR. To ensure that the signal always operates within the linear workspace, an appropriate carrier amplitude is set as the demodulation operating point. By calculating the THD at different operating points, the LRC performance within different regions of the linear workspace is evaluated, and corresponding optimization strategies based on the range of signal strengths are proposed. Moreover, to more accurately restore the baseband signal, we establish a mapping relationship between the carrier Rabi frequency and the transmitted power of the probe light, and optimize the slope of the linear demodulation function to reduce the MSE to less than 0.8×10^(-4). Finally, based on these methods for determining the operational parameters, we explore the effects of different laser Rabi frequencies on the system performance, and provide optimization recommendations. This research provides robust support for the design of high-performance Rydberg atom-based AM receivers.
