During operating of the X-ray machines, if the protection of X-ray rooms is insufficient, not only the patient but also clinical staffs as well as public are exposed to high X-ray dosage and they are affected from X-r...During operating of the X-ray machines, if the protection of X-ray rooms is insufficient, not only the patient but also clinical staffs as well as public are exposed to high X-ray dosage and they are affected from X-ray related to the dose level. In the present survey, by testing the radiological leakage and scatter from X-rays machines in radiology departments of 7 randomly selected hospitals in Duhok governorate, the effects dose of X-ray to the both control panel area and the patients waiting or visiting area who are located near the radiography room, were measured. The dose was recorded for a range of peak kilovoltage (kVp) and mAs values to find efficiency of shielding materials (barriers) of radiography rooms for different X-rays level. The measurements were performed at one meter above the ground surface which was the same height of X-rays tube by using Gamma Scout dosimeter. From the measurement results, it was seen that the most hospitals barriers (doors and walls) were not appropriate to the standards except 2 hospitals. The maximum effective doses were measured in uncontrolled area of Khazer hospital which was 82.48 ± 0.73 mSv·yr-1 that was much more than the reference dose limits and in controlled area of Haval Banda Zaroka hospital which was 12.98 ± 0.16 mSv·yr-1. In result, the knowledge about the radiation dose affecting the radiologists and public in the selected hospitals was obtained, and by informing the radiologists and the hospitals managements, the necessary regulations would be planned.展开更多
Because the leakage protection circuit in traction motor of coal mining machine is impacted by frequency converter devices,malfunctions appear frequently.This paper makes an in-depth analysis,proposes a solution of us...Because the leakage protection circuit in traction motor of coal mining machine is impacted by frequency converter devices,malfunctions appear frequently.This paper makes an in-depth analysis,proposes a solution of using the subtraction circuit to offset interference signals and conducts a simulation analysis.The above scheme,which is simple and easily realized,can improve the reliability of leakage protection device in traction motor.展开更多
In the model of m vivo rabbit heart subjected to ischemia/reperfusion(I/R),the effect of limb ischemic preconditioning(LIPC)on I/R injury ofrabbit heart was observed,in order to investigate the phenomenon oforgan cros...In the model of m vivo rabbit heart subjected to ischemia/reperfusion(I/R),the effect of limb ischemic preconditioning(LIPC)on I/R injury ofrabbit heart was observed,in order to investigate the phenomenon oforgan crossed preconditioning.The esults found that both of limb andheart preconditioning limited myocardial infarct size(21.3±6.5 in limbIPC group and 19.5±6.3 in heart IPC group vs.36.7±7.2 in I/R group,p【0.05).reduced leakage of lactate dehydrogenase(LDH)frommyocardium(1895±164 in limb IPC group,1758±176 in heart IPCgroup vs.2792±189 U/L in I/R group,p【0.01).It is suggested tha limbIPC has a protective effect on limiting myocardial infarct size induced byI/R injury.The protective degress is similar to that of ischemicpreconditioning on展开更多
A simple one-dimensional subwavelength plasmonic grating can support symmetry protected bound states in the continuum(BICs),but not necessarily for the non-symmetry protected BICs.By dimerizing the lattice,nonsymmetry...A simple one-dimensional subwavelength plasmonic grating can support symmetry protected bound states in the continuum(BICs),but not necessarily for the non-symmetry protected BICs.By dimerizing the lattice,nonsymmetry protected BIC can be supported on the dimerized grating and can be tuned readily.The mechanism for the BICs in the dimerized grating is interpreted in the viewpoint of interference between the electromagnetic multipoles.展开更多
Information leaks through regular fiber optic communications is possible in the form of eavesdropping on conversations, using standard fiber optic communications as illegal measuring network. The threat of leakage of ...Information leaks through regular fiber optic communications is possible in the form of eavesdropping on conversations, using standard fiber optic communications as illegal measuring network. The threat of leakage of audio information can create any kind of irregular light emission, as well as regular light beams modulated at acoustic frequencies. For information protection can be used a means of sound insulation, filtration and noising. This paper discusses the technical possibilities of countering threats by monitoring the optical radiation to detect eavesdropping.展开更多
Despite its long history,the anomalous Hall continues to attract attention due to its complex origins,its connection to topology,and its use as a probe of magnetic order.In this work we investigate the anomalous Hall ...Despite its long history,the anomalous Hall continues to attract attention due to its complex origins,its connection to topology,and its use as a probe of magnetic order.In this work we investigate the anomalous Hall effect in 2871 ferromagnetic materials using an automatic high-throughput calculation scheme.We analyze general properties of the effect,such as its reliance on spin-orbit coupling strength and magnetization.In materials with the largest anomalous Hall effect,we find that symmetry-protected band degeneracies in the non-relativistic electronic structure,such as mirror symmetry-protected nodal lines,are typically responsible for the large effect.Furthermore,we examine the dependence of the anomalous Hall effect on magnetization direction and demonstrate deviations from the commonly assumed expression j^(AHE)~M×E.展开更多
文摘During operating of the X-ray machines, if the protection of X-ray rooms is insufficient, not only the patient but also clinical staffs as well as public are exposed to high X-ray dosage and they are affected from X-ray related to the dose level. In the present survey, by testing the radiological leakage and scatter from X-rays machines in radiology departments of 7 randomly selected hospitals in Duhok governorate, the effects dose of X-ray to the both control panel area and the patients waiting or visiting area who are located near the radiography room, were measured. The dose was recorded for a range of peak kilovoltage (kVp) and mAs values to find efficiency of shielding materials (barriers) of radiography rooms for different X-rays level. The measurements were performed at one meter above the ground surface which was the same height of X-rays tube by using Gamma Scout dosimeter. From the measurement results, it was seen that the most hospitals barriers (doors and walls) were not appropriate to the standards except 2 hospitals. The maximum effective doses were measured in uncontrolled area of Khazer hospital which was 82.48 ± 0.73 mSv·yr-1 that was much more than the reference dose limits and in controlled area of Haval Banda Zaroka hospital which was 12.98 ± 0.16 mSv·yr-1. In result, the knowledge about the radiation dose affecting the radiologists and public in the selected hospitals was obtained, and by informing the radiologists and the hospitals managements, the necessary regulations would be planned.
文摘Because the leakage protection circuit in traction motor of coal mining machine is impacted by frequency converter devices,malfunctions appear frequently.This paper makes an in-depth analysis,proposes a solution of using the subtraction circuit to offset interference signals and conducts a simulation analysis.The above scheme,which is simple and easily realized,can improve the reliability of leakage protection device in traction motor.
文摘In the model of m vivo rabbit heart subjected to ischemia/reperfusion(I/R),the effect of limb ischemic preconditioning(LIPC)on I/R injury ofrabbit heart was observed,in order to investigate the phenomenon oforgan crossed preconditioning.The esults found that both of limb andheart preconditioning limited myocardial infarct size(21.3±6.5 in limbIPC group and 19.5±6.3 in heart IPC group vs.36.7±7.2 in I/R group,p【0.05).reduced leakage of lactate dehydrogenase(LDH)frommyocardium(1895±164 in limb IPC group,1758±176 in heart IPCgroup vs.2792±189 U/L in I/R group,p【0.01).It is suggested tha limbIPC has a protective effect on limiting myocardial infarct size induced byI/R injury.The protective degress is similar to that of ischemicpreconditioning on
基金Supported by the National Natural Science Foundation of China(Grant Nos.11804288 and 91750102)the Projects of President Foundation of Chongqing University(Grant No.2019CDXZWL002)。
文摘A simple one-dimensional subwavelength plasmonic grating can support symmetry protected bound states in the continuum(BICs),but not necessarily for the non-symmetry protected BICs.By dimerizing the lattice,nonsymmetry protected BIC can be supported on the dimerized grating and can be tuned readily.The mechanism for the BICs in the dimerized grating is interpreted in the viewpoint of interference between the electromagnetic multipoles.
文摘Information leaks through regular fiber optic communications is possible in the form of eavesdropping on conversations, using standard fiber optic communications as illegal measuring network. The threat of leakage of audio information can create any kind of irregular light emission, as well as regular light beams modulated at acoustic frequencies. For information protection can be used a means of sound insulation, filtration and noising. This paper discusses the technical possibilities of countering threats by monitoring the optical radiation to detect eavesdropping.
基金We acknowledge the Grant Agency of the Czech Republic Grant No.22-21974SMinistry of Education of the Czech Republic Grant LM2018110+2 种基金National Key R&D Program of China 2021YFB3501503National Natural Science Foundation of China(Grants 52271016,No.52188101)This work was supported by the Ministry of Education,Youth and Sports of the Czech Republic through the e-INFRA CZ(ID:90254).Y.Y.acknowledges support from GP-Spin at Tohoku University.Y.Z.was supported by the start-up fund at the University of Tennessee.
文摘Despite its long history,the anomalous Hall continues to attract attention due to its complex origins,its connection to topology,and its use as a probe of magnetic order.In this work we investigate the anomalous Hall effect in 2871 ferromagnetic materials using an automatic high-throughput calculation scheme.We analyze general properties of the effect,such as its reliance on spin-orbit coupling strength and magnetization.In materials with the largest anomalous Hall effect,we find that symmetry-protected band degeneracies in the non-relativistic electronic structure,such as mirror symmetry-protected nodal lines,are typically responsible for the large effect.Furthermore,we examine the dependence of the anomalous Hall effect on magnetization direction and demonstrate deviations from the commonly assumed expression j^(AHE)~M×E.
