A preparation technology of semi-solid metal slurry introducing grain process （IGP） was developed. The effects of processing parameters on the microstructures of the semi-solid A356 Al-alloy slurries were investigat...A preparation technology of semi-solid metal slurry introducing grain process （IGP） was developed. The effects of processing parameters on the microstructures of the semi-solid A356 Al-alloy slurries were investigated, and the formation mechanism and morphology controlling of the spherical primary a（A1） grains were discussed. The results show that when the preparing slurry is 4 kg, IG size is 10 mm, dosage is 3.5% and dumping temperature （DT） is 611-617 ℃, the mean diameter of the primary a（A1） grains in the semi-solid slurries can reach 40-75 μm and the shape factor can reach 0.82-0.89. When the IG size is 10 mm, DT is 613℃and dosage is 2%-4%, the mean diameter can reach 45-82 μm and the shape factors can reach 0.78-0.88. With decreasing DT or increasing dosage properly, the primary α（A1） grain morphology is better. When QR=QA and Rh=Rc, as long as the DT is suitable, excellent semi-solid slurry can be produced. As a result of the IG melting, a large amount of dendritic fragments can become the direct source of the primary a（A1） grains. Meanwhile, many undercooled areas are formed, where abundant primary α（A1） grains are multiplied by heterogeneous nucleation.展开更多
The world situation is experiencing profound and complex changes. With the further deepening of economic globalization, various countries with interwoven interests are becoming increasingly interdependent and interrel...The world situation is experiencing profound and complex changes. With the further deepening of economic globalization, various countries with interwoven interests are becoming increasingly interdependent and interrelated. A large number of big developing countries are rising, adding fresh rich elements to the trend of development toward multi-polarity.展开更多
We propose an efficient method for the generation of an isolated attosecond pulse from the asymmetric molecular ions HeH^2＋ by adding a half-cycle-like field （HCLF） to the fundamental driving laser field. The high-...We propose an efficient method for the generation of an isolated attosecond pulse from the asymmetric molecular ions HeH^2＋ by adding a half-cycle-like field （HCLF） to the fundamental driving laser field. The high-order harmonic generation （HHG） is investigated by numerically sowing the time-dependent Schrodinger equation. By performing the time-frequency distributions and the electronic wave packet probability densities, we find that the optimizing combined field is not only useful for extending the HHG cutoff, but also for simplifying the recombination channels through controlling the electron localization. In addition, by adjusting the intensity of the HCLF, a dominant short quantum path is selected to contribute the HHG spectrum. As a result, a 75-as isolated attosecond pulse is obtained by superposing a proper range of the harmonics.展开更多
Tricyclic compound 6 was synthesized form compound 1 through sis steps, thus preblem of the stereochemistry of C2α-H being solved. The stereochemistry for introducing hydroxy groups at C3β and C4α positions in com...Tricyclic compound 6 was synthesized form compound 1 through sis steps, thus preblem of the stereochemistry of C2α-H being solved. The stereochemistry for introducing hydroxy groups at C3β and C4α positions in compound 1 was also described.展开更多
At the beginning of this New Year of 2013, we are very pleased to present the English edition of the Journal of Integrative Medicine （JIM）, a PubMed-indexed, peer-reviewed, open-access journal on integrative medicin...At the beginning of this New Year of 2013, we are very pleased to present the English edition of the Journal of Integrative Medicine （JIM）, a PubMed-indexed, peer-reviewed, open-access journal on integrative medicine. The JIM is a continuation of the former Chinese-language journal, the Journal of Chinese Integrative Medicine （JCIM）, established in 2003 and published in Shanghai. Integrative medicine, grounded in patient-centered, evidence-based practice, incorporates the broad spectrum of complementary and alternative medicine （CAM） and includes acupuncture and traditional Chinese medicine, Ayurveda medicine, herbal medicine, homeopathy, nutrition, chiropractic, mind-body medicine, taichi, qigong, and meditation, among other professions. In the past two decades, CAM has become one of the fastest growing branches of health care. CAM now commands attention worldwide and is rapidly being integrated into conventional medicine. China is the country in the world that has great number of scientists doing clinical and research work on integrative medicine. With this new, English-language publication, we are committed to make JIM an international platform for high-quality CAM papers and an open forum in which the different professions and international scholarly communities can exchange views, share research and their clinical experience, discuss CAM education, and confer about issues and problems in our various disciplines and in CAM as a whole in order to promote integrative medicine.展开更多
In the field of developmental biology and regenerative medicine,mammalian interspecific chimeras have been proved very useful for investigating early embryonic development and the immune system establishment,and exten...In the field of developmental biology and regenerative medicine,mammalian interspecific chimeras have been proved very useful for investigating early embryonic development and the immune system establishment,and extended to a promising potential for human organ generation（Rossant et al.,1982）.展开更多
JOURNAL OF CHINA ORDNANCE, an official journal sponsored by China Ordnance Society and published half-yearly, aims to presenting the latest developments and achievements of the academic circles specializing in the fie...JOURNAL OF CHINA ORDNANCE, an official journal sponsored by China Ordnance Society and published half-yearly, aims to presenting the latest developments and achievements of the academic circles specializing in the field of ordnance science and technology. It provides a展开更多
Sustained and profound aridization process in north west China in Tertiary and Quaternary period and time of mankind history are discussed. The rain creased function of 3 set high mountain condensation systems in nort...Sustained and profound aridization process in north west China in Tertiary and Quaternary period and time of mankind history are discussed. The rain creased function of 3 set high mountain condensation systems in north west China is recognized once more. A sandstorm happened on 20th March 2002 in Alasan and Ejinaqi areas was very strong and arrived in Japan and Korea. For saving Alasan area from sandstorm a way of introducing sea water from Bohai to Alasan has been proposed. Four problems are replied in this paper. It is concluded that introducing sea water from Bohai to west China is the best way for sustainable development of west China.展开更多
As a treasure of Chinese traditional culture, wushu will soon be inherited and developed. But martial arts need to be inherited, we need to start with children, promote it in kindergartens, cultivate children's in...As a treasure of Chinese traditional culture, wushu will soon be inherited and developed. But martial arts need to be inherited, we need to start with children, promote it in kindergartens, cultivate children's interest in wushu and promote children's all-round development. The introduction of surgery into the kindergarten curriculum system enables kindergarten teachers to take the initiative to participate in martial arts learning and acquire certain martial arts skills. During the accumulated teaching process, a new road is opened for the inheritance and development of martial arts.展开更多
The introduction of an oral performance test for Chinese college students at Band Four is proposed.The current CET-4 test and the qualitative problems associated with it are analysed,and the possible positive backwash...The introduction of an oral performance test for Chinese college students at Band Four is proposed.The current CET-4 test and the qualitative problems associated with it are analysed,and the possible positive backwash of such an innovation is explored.展开更多
The recently opened Qinghai-Tibet Railway is bringing not only crowds of tourists but also information to Tibet, which previously was virtually shut off from the outside world. Liu Xuan, Deputy Director of the Informa...The recently opened Qinghai-Tibet Railway is bringing not only crowds of tourists but also information to Tibet, which previously was virtually shut off from the outside world. Liu Xuan, Deputy Director of the Information Office of the Tibet regional government, discusses how the local government regards this issue and how it will respond to the new openness in an interview with Beijing Review reporter Feng Jianhua.展开更多
A distortion correction method for the elemental images of integral imaging（Ⅱ） by utilizing the directional diffuser is demonstrated. In the traditional Ⅱ, the distortion originating from lens aberration wraps ele...A distortion correction method for the elemental images of integral imaging（Ⅱ） by utilizing the directional diffuser is demonstrated. In the traditional Ⅱ, the distortion originating from lens aberration wraps elemental images and degrades the image quality severely. According to the theoretical analysis and experiments, it can be proved that the farther the three-dimensional image is displayed from the lens array, the more serious the distortion is. To analyze the process of eliminating lens distortion, one lens and its corresponding elemental image are separated from the traditional Ⅱ. By introducing the directional diffuser, the aperture stop of the separated optical system changes from the eye＇s pupil to the lens. In terms of contrast experiments, the distortion of the improved display system is corrected effectively. In the experiment, when the distance between the reconstructed image and lens array is equal to 120 mm, the largest lens distortion is decreased from 46.6% to 3.3%.展开更多
文摘A preparation technology of semi-solid metal slurry introducing grain process （IGP） was developed. The effects of processing parameters on the microstructures of the semi-solid A356 Al-alloy slurries were investigated, and the formation mechanism and morphology controlling of the spherical primary a（A1） grains were discussed. The results show that when the preparing slurry is 4 kg, IG size is 10 mm, dosage is 3.5% and dumping temperature （DT） is 611-617 ℃, the mean diameter of the primary a（A1） grains in the semi-solid slurries can reach 40-75 μm and the shape factor can reach 0.82-0.89. When the IG size is 10 mm, DT is 613℃and dosage is 2%-4%, the mean diameter can reach 45-82 μm and the shape factors can reach 0.78-0.88. With decreasing DT or increasing dosage properly, the primary α（A1） grain morphology is better. When QR=QA and Rh=Rc, as long as the DT is suitable, excellent semi-solid slurry can be produced. As a result of the IG melting, a large amount of dendritic fragments can become the direct source of the primary a（A1） grains. Meanwhile, many undercooled areas are formed, where abundant primary α（A1） grains are multiplied by heterogeneous nucleation.
文摘The world situation is experiencing profound and complex changes. With the further deepening of economic globalization, various countries with interwoven interests are becoming increasingly interdependent and interrelated. A large number of big developing countries are rising, adding fresh rich elements to the trend of development toward multi-polarity.
基金Supported by the National Natural Science Foundation of China under Grant No 11404204the Key Project of the Ministry of Education of China under Grant No 211025+1 种基金the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20111404120004the Natural Science Foundation for Young Scientists of Shanxi Province under Grant No 2009021005
文摘We propose an efficient method for the generation of an isolated attosecond pulse from the asymmetric molecular ions HeH^2＋ by adding a half-cycle-like field （HCLF） to the fundamental driving laser field. The high-order harmonic generation （HHG） is investigated by numerically sowing the time-dependent Schrodinger equation. By performing the time-frequency distributions and the electronic wave packet probability densities, we find that the optimizing combined field is not only useful for extending the HHG cutoff, but also for simplifying the recombination channels through controlling the electron localization. In addition, by adjusting the intensity of the HCLF, a dominant short quantum path is selected to contribute the HHG spectrum. As a result, a 75-as isolated attosecond pulse is obtained by superposing a proper range of the harmonics.
文摘Tricyclic compound 6 was synthesized form compound 1 through sis steps, thus preblem of the stereochemistry of C2α-H being solved. The stereochemistry for introducing hydroxy groups at C3β and C4α positions in compound 1 was also described.
文摘At the beginning of this New Year of 2013, we are very pleased to present the English edition of the Journal of Integrative Medicine （JIM）, a PubMed-indexed, peer-reviewed, open-access journal on integrative medicine. The JIM is a continuation of the former Chinese-language journal, the Journal of Chinese Integrative Medicine （JCIM）, established in 2003 and published in Shanghai. Integrative medicine, grounded in patient-centered, evidence-based practice, incorporates the broad spectrum of complementary and alternative medicine （CAM） and includes acupuncture and traditional Chinese medicine, Ayurveda medicine, herbal medicine, homeopathy, nutrition, chiropractic, mind-body medicine, taichi, qigong, and meditation, among other professions. In the past two decades, CAM has become one of the fastest growing branches of health care. CAM now commands attention worldwide and is rapidly being integrated into conventional medicine. China is the country in the world that has great number of scientists doing clinical and research work on integrative medicine. With this new, English-language publication, we are committed to make JIM an international platform for high-quality CAM papers and an open forum in which the different professions and international scholarly communities can exchange views, share research and their clinical experience, discuss CAM education, and confer about issues and problems in our various disciplines and in CAM as a whole in order to promote integrative medicine.
基金supported by the grants from the National Natural Science Foundation of China (Nos.31621004,31501188 and 31422038)the Key Research Projects of the Frontier Science of the Chinese Academy of Sciences (QYZDY-SSW-SMC002)the Strategic Priority Research Program of the Chinese Academy of Sciences (XDA16000000)
文摘In the field of developmental biology and regenerative medicine,mammalian interspecific chimeras have been proved very useful for investigating early embryonic development and the immune system establishment,and extended to a promising potential for human organ generation（Rossant et al.,1982）.
文摘JOURNAL OF CHINA ORDNANCE, an official journal sponsored by China Ordnance Society and published half-yearly, aims to presenting the latest developments and achievements of the academic circles specializing in the field of ordnance science and technology. It provides a
文摘Sustained and profound aridization process in north west China in Tertiary and Quaternary period and time of mankind history are discussed. The rain creased function of 3 set high mountain condensation systems in north west China is recognized once more. A sandstorm happened on 20th March 2002 in Alasan and Ejinaqi areas was very strong and arrived in Japan and Korea. For saving Alasan area from sandstorm a way of introducing sea water from Bohai to Alasan has been proposed. Four problems are replied in this paper. It is concluded that introducing sea water from Bohai to west China is the best way for sustainable development of west China.
文摘As a treasure of Chinese traditional culture, wushu will soon be inherited and developed. But martial arts need to be inherited, we need to start with children, promote it in kindergartens, cultivate children's interest in wushu and promote children's all-round development. The introduction of surgery into the kindergarten curriculum system enables kindergarten teachers to take the initiative to participate in martial arts learning and acquire certain martial arts skills. During the accumulated teaching process, a new road is opened for the inheritance and development of martial arts.
文摘The introduction of an oral performance test for Chinese college students at Band Four is proposed.The current CET-4 test and the qualitative problems associated with it are analysed,and the possible positive backwash of such an innovation is explored.
文摘The recently opened Qinghai-Tibet Railway is bringing not only crowds of tourists but also information to Tibet, which previously was virtually shut off from the outside world. Liu Xuan, Deputy Director of the Information Office of the Tibet regional government, discusses how the local government regards this issue and how it will respond to the new openness in an interview with Beijing Review reporter Feng Jianhua.
基金supported by the Natural National Science Foundation of China(NSFC)(No.61705014)the Fundamental Research Funds for the Central Universities(No.2016ZX01)+1 种基金the fund of the State Key Laboratory of Information Photonics and Optical CommunicationsThe "863" Program(No.2015AA015902)
文摘A distortion correction method for the elemental images of integral imaging（Ⅱ） by utilizing the directional diffuser is demonstrated. In the traditional Ⅱ, the distortion originating from lens aberration wraps elemental images and degrades the image quality severely. According to the theoretical analysis and experiments, it can be proved that the farther the three-dimensional image is displayed from the lens array, the more serious the distortion is. To analyze the process of eliminating lens distortion, one lens and its corresponding elemental image are separated from the traditional Ⅱ. By introducing the directional diffuser, the aperture stop of the separated optical system changes from the eye＇s pupil to the lens. In terms of contrast experiments, the distortion of the improved display system is corrected effectively. In the experiment, when the distance between the reconstructed image and lens array is equal to 120 mm, the largest lens distortion is decreased from 46.6% to 3.3%.
