Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical phenomena.We use the Martin-Pup...Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical phenomena.We use the Martin-Puplett interferometer(MPI)polarimeter to probe the peripheral magnetic fields generated in the common magnetic reconnection configuration,two separated coplanar plane targets,in laser-target interaction.We introduce a new method that can obtain polarization information from the interference pattern instead of the sinusoidal function fitting of the intensity.A bidirectional magnetic field is observed from the side view,which is consistent with the magneto-hydro-dynamical(MHD)simulation results of self-generated magnetic field reconnection.We find that the cancellation of reverse magnetic fields after averaging and integration along the observing direction could reduce the magnetic field strength by one to two orders of magnitude.It indicates that imaging resolution can significantly affect the accuracy of measured magnetic field strength.展开更多
世界癌症研究基金会(International Agency for Research on Cancer,IARC)报告指出,过多摄入红肉会增加患癌症的风险,但是否有足够令人信服的证据证明呢?本文对近年来有关红肉摄入对人类患肺癌、前列腺癌、乳腺癌、结/直肠癌、膀胱癌、...世界癌症研究基金会(International Agency for Research on Cancer,IARC)报告指出,过多摄入红肉会增加患癌症的风险,但是否有足够令人信服的证据证明呢?本文对近年来有关红肉摄入对人类患肺癌、前列腺癌、乳腺癌、结/直肠癌、膀胱癌、食道癌和胃癌的风险等国外文章进行综述。研究表明,没有人体量-效关系实验等证据证明癌症与食用红肉和加工肉有直接关系,但大量摄入红肉、高温及炸制红肉,患某些癌症的风险会相对增加,还伴随着其他致癌因素,如吸烟、酗酒、癌症家族史、遗传变异等。此结果是否适应我国人群,尚有待进一步研究确证。预防癌症的有效途径为降低或控制红肉过量摄入,采用科学的烹饪和加工方法,戒烟及少饮酒,多摄入新鲜蔬菜、水果等平衡膳食。展开更多
It is challenging to make an ultrafast diagnosis of the temporal evolution of small and short-lived plasma in two dimensions. To overcome this difficulty, we have developed a well-timed diagnostic utilizing an x-ray s...It is challenging to make an ultrafast diagnosis of the temporal evolution of small and short-lived plasma in two dimensions. To overcome this difficulty, we have developed a well-timed diagnostic utilizing an x-ray streak camera equipped with a row of multi-pinhole arrays. By processing multiple sets of one-dimensional streaked image data acquired from various pinholes, we are capable of reconstructing high-resolution two-dimensional images with a temporal resolution of 38 ps and a spatial resolution of 18 μm. The temporal fiducial pulses accessed from external sources can advance the precise timing and accurately determine the arrival time of the laser. Moreover, it can correct the nonlinear sweeping speed of the streak camera. The effectiveness of this diagnostic has been successfully verified at the Shenguang-II laser facility,providing an indispensable tool for observing complex physical phenomena, such as the implosion process of laser-fusion experiments.展开更多
基金Project supported by the National Key R&D Program of China (Grant Nos.2022YFA1603200 and 2022YFA1603203)the National Natural Science Foundation of China (Grant Nos.12075030,12135001,12175018,and 12325305)+3 种基金the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDA25030700)the Research Grants Council of Hong (Grant No.14307118)the Youth Interdisciplinary Team (Grant No.JCTD-2022-05)supported by the China Postdoctoral International Exchange Program。
文摘Magnetic reconnection of the self-generated magnetic fields in laser-plasma interaction is an important laboratory method for modeling high-energy density astronomical and astrophysical phenomena.We use the Martin-Puplett interferometer(MPI)polarimeter to probe the peripheral magnetic fields generated in the common magnetic reconnection configuration,two separated coplanar plane targets,in laser-target interaction.We introduce a new method that can obtain polarization information from the interference pattern instead of the sinusoidal function fitting of the intensity.A bidirectional magnetic field is observed from the side view,which is consistent with the magneto-hydro-dynamical(MHD)simulation results of self-generated magnetic field reconnection.We find that the cancellation of reverse magnetic fields after averaging and integration along the observing direction could reduce the magnetic field strength by one to two orders of magnitude.It indicates that imaging resolution can significantly affect the accuracy of measured magnetic field strength.
文摘世界癌症研究基金会(International Agency for Research on Cancer,IARC)报告指出,过多摄入红肉会增加患癌症的风险,但是否有足够令人信服的证据证明呢?本文对近年来有关红肉摄入对人类患肺癌、前列腺癌、乳腺癌、结/直肠癌、膀胱癌、食道癌和胃癌的风险等国外文章进行综述。研究表明,没有人体量-效关系实验等证据证明癌症与食用红肉和加工肉有直接关系,但大量摄入红肉、高温及炸制红肉,患某些癌症的风险会相对增加,还伴随着其他致癌因素,如吸烟、酗酒、癌症家族史、遗传变异等。此结果是否适应我国人群,尚有待进一步研究确证。预防癌症的有效途径为降低或控制红肉过量摄入,采用科学的烹饪和加工方法,戒烟及少饮酒,多摄入新鲜蔬菜、水果等平衡膳食。
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant Nos. XDA25030700 and XDA25030500)the National Key R&D Program of China (Grant Nos. 2022YFA1603200 and 2022YFA1603203)the National Natural Science Foundation of China (Grant Nos. 12175018, 12135001, 12075030, and 11903006)。
文摘It is challenging to make an ultrafast diagnosis of the temporal evolution of small and short-lived plasma in two dimensions. To overcome this difficulty, we have developed a well-timed diagnostic utilizing an x-ray streak camera equipped with a row of multi-pinhole arrays. By processing multiple sets of one-dimensional streaked image data acquired from various pinholes, we are capable of reconstructing high-resolution two-dimensional images with a temporal resolution of 38 ps and a spatial resolution of 18 μm. The temporal fiducial pulses accessed from external sources can advance the precise timing and accurately determine the arrival time of the laser. Moreover, it can correct the nonlinear sweeping speed of the streak camera. The effectiveness of this diagnostic has been successfully verified at the Shenguang-II laser facility,providing an indispensable tool for observing complex physical phenomena, such as the implosion process of laser-fusion experiments.
