Using conversion electron spectroscopy(CEMS) and slow positron beam, the chemical state of 57Fe(100keV,3×1016 cm-2) implanted into ZrO2 containing 0.03 mole fraction Y2O3(ZY3) and its thermodynamic behavior duri...Using conversion electron spectroscopy(CEMS) and slow positron beam, the chemical state of 57Fe(100keV,3×1016 cm-2) implanted into ZrO2 containing 0.03 mole fraction Y2O3(ZY3) and its thermodynamic behavior during annealing process at 200 ￣ 500℃ are studied.For as-implanted sample, Fe chemical states of Fe0,Fe2+ and Fe3+ are observed,and assigned to the superparamagnetic metallic iron cluster,iron dimer(and trimer) and complex of the Fe3+ associated with canon vacancy (V) and oxygens respectively.After annealing at 400℃ the complexes of Fe3+-V are mostly dissolved,and the prior phase to α-Fe and α-Fe nano-crystalline cluster are present in the sample.Meanwhile the mixed conducting of oxygen-ions and electrons in the ZY3 sample containing Fe appears,it may correlate with the different iron charge states and their relative amounts,in particular with the α-Fe nano-granule.展开更多
<strong>Objective:</strong><span style="font-family:""><span style="font-family:Verdana;"> Breast cancer is a public health challenge on a global scale that is caused b...<strong>Objective:</strong><span style="font-family:""><span style="font-family:Verdana;"> Breast cancer is a public health challenge on a global scale that is caused by environmental or genetic factors. Breast cancer is affecting both males and females, but there is still a lack of effective drugs with improved potency and admissibility against breast cancer as many of the breast cancer drugs have severe side effects. </span><b><span style="font-family:Verdana;">Methods:</span></b><span style="font-family:Verdana;"> The docking approach has been used </span><span><span style="font-family:Verdana;">to find a new compound for breast cancer with more efficacy and tolerance and with lesser side effects. A ligand-based pharmacophore approach has been generated for 39 anticancer compounds with significance for the development of new drugs. </span><b><span style="font-family:Verdana;">Result:</span></b><span style="font-family:Verdana;"> Through docking, the approach found new lead compoun</span></span><span style="font-family:Verdana;">ds for breast cancer. The proposed pharmacophore model in this study contains two HBAs and one HYD</span></span><span style="font-family:Verdana;">,</span><span style="font-family:""><span style="font-family:Verdana;"> one hydrophobic domain </span><span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> two Aromatic rings</span></span><span style="font-family:""><span style="font-family:Verdana;"> and the estimated distance range is minimum to maxi</span><span style="font-family:Verdana;">mum of derived pharmacophore features.</span></span><span style="font-family:""> <b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> Based on this research, it is proposed that these two lead compounds may be able to be used against EGFR in breast cancer. New compounds can be identified based on common features in the Pharmacophore model. 3D pharmacophore triangle could be used for further studies because this pharmacophore has better merging and in the future for more studies can suggest the same distance range of pha</span></span><span style="font-family:Verdana;">rmacophore features as this pharmacophore.</span>展开更多
The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement wi...The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 120-210 mg/L, oscillation speed of 100-200 r/min and temperature of 298-328K. The experimental results show that methylene blue is only adsorbed onto the external surface of purified palygorskite, and the apparent adsorption activation energy is 13.92 kJ/mol. The relatively low apparent adsorption activation energy suggests that the adsorption of methylene blue involves in not only a chemical, but also a physical adsorption process, and it is controlled by the combination of chemical adsorption and fiquid-film diffusion.展开更多
We report the discovery of a broad absorption line （BAL） of - 10^4 km s^-1 in width in the previously known BL Lac object PKS 0138-097, which we tentatively identified as an Mg II BAL. This is the first detection of...We report the discovery of a broad absorption line （BAL） of - 10^4 km s^-1 in width in the previously known BL Lac object PKS 0138-097, which we tentatively identified as an Mg II BAL. This is the first detection of a BAL, which is sometimes seen in powerful quasars with high accretion rates, in a BL Lac object. The BAL was clearly detected in its spectra spanning two epochs at a high luminosity state taken in the Sloan Digital Sky Survey （SDSS）, while it disappeared in three SDSS spectra taken at a low luminosity state. The BAL and its variability pattern were also found in its historical multi-epoch spectra in the literature, but have been overlooked previously. In its high resolution radio maps, PKS 0138-097 shows a core plus a one- sided parsec-scale jet. The BAL variability can be interpreted as follows： The optical emission is dominated by the core in a high state and by the jet in a low state and the BAL material is located between the core and jet so that the BAL appears only when the core is shining. Our discovery suggests that outflows may also be produced in active galactic nuclei at a low accreting state.展开更多
The Global Precipitation Climatology Project （GPCP） monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipi...The Global Precipitation Climatology Project （GPCP） monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipitation in China in the period from January 1980 to December 2000. Results expose significantly consistent rainfall distributions between the both data in multi-year mean, multi-year seasonal mean, and multi-year monthly mean. Departures of monthly rainfall for each dataset also show a high correlation with an over 0.8 correlation coefficient. Analysis indicates small differences of both datasets during autumn, winter, and spring, but relative large ones in summer. Generally, the GPCP has trend of overestimating the rainfall rate. Based on above good relationship of both datasets, the GPCP data, are used to represent distributions and variations of precipitation in the Tibetan Plateau and Northwest China. Results indicate positive departures of precipitation in summer in the west part of Tibetan Plateau in the 1980s and negative departures after the 1980s. For the west part of Northwest China, analysis illustrates precipitation decreases a little, but no clear variation tendency.展开更多
The detailed structures and the corresponding formation mechanisms of the well-known Al_(10)RE_2Mn_7 phase in the conventional die-cast Mg–4Al–4RE–0.3Mn alloy were thoroughly investigated using transmission electro...The detailed structures and the corresponding formation mechanisms of the well-known Al_(10)RE_2Mn_7 phase in the conventional die-cast Mg–4Al–4RE–0.3Mn alloy were thoroughly investigated using transmission electron microscopy(TEM). The results indicate that the Al_(10)RE_2Mn_7 phase ordinarily contains both normal (111) twins and orientation twins.Both detailed TEM observations and density functional theory calculations indicate that the Al_(10)RE_2Mn_7 phase is transferred from the Al_8REMn_4 phase following an orientation relationship as [010]_(Al_8REMn_4)//[101]_(Al_(10)RE_2Mn_7) and (101)_(Al_8REMn_4)//(110)_(Al_(10)RE_2Mn_7). Moreover, forming orientation twins in the Al_(10)RE_2Mn_7 phase is attributed to the blurry regions at incoherent twin boundaries in the Al_8REMn_4 phase. Finally, these formed orientation twins result in the (111) twins in the Al_(10)RE_2Mn_7 phase.展开更多
In order to improve the frequency and precision of radiometric calibration, the automated vicarious calibration system（AVCS） is developed and deployed at the Dunhuang test site to perform vicarious calibration witho...In order to improve the frequency and precision of radiometric calibration, the automated vicarious calibration system（AVCS） is developed and deployed at the Dunhuang test site to perform vicarious calibration without the in situ manned measurements. The surface and atmospheric parameters are automatically collected by AVCS.An absolute radiometric calibration approach based on AVCS is proposed. Six successful calibrations of the Aqua Moderate Resolution Imaging Spectroradiometer（MODIS） are conducted. The results are in good agreement with the on-board calibration system with all the relative differences less than 4%. It enables us to monitor the change of a sensor over long time scales.展开更多
Four thymine (T) and adenine (A) de- rivatives with pyrene, tetrathiafulvalene and nitronyl nitroxide units (1, 2, 3 and 4) were synthesized and characterized. Fluorescent spectral studies indicate that the correspond...Four thymine (T) and adenine (A) de- rivatives with pyrene, tetrathiafulvalene and nitronyl nitroxide units (1, 2, 3 and 4) were synthesized and characterized. Fluorescent spectral studies indicate that the corresponding T and A derivatives can form ensembles with the association constant of ca. 104 L/mol. The ensemble of 1 and 2 shows pyrene exci- mer emission, while that of 1/3 and 2/4 displays rather weak fluorescence due to the “intramolecular” photoinduced electron transfer reactions. Addition of compounds 5 or 6, which is T and A derivatives, re- spectively, to the ensembles of 1/2, 1/3 and 2/4 re- sults in reduction of excimer emission and en- hancement of pyrene fluorescence. These results show that these ensembles are able to sense T and A molecules.展开更多
Effects of electropulsing treatment(EPT)on the microstructural evolution and mechanical properties of a cold-rolled 316 L austenitic stainless steel with nano-lamellar structure were investigated.The EPT experiments w...Effects of electropulsing treatment(EPT)on the microstructural evolution and mechanical properties of a cold-rolled 316 L austenitic stainless steel with nano-lamellar structure were investigated.The EPT experiments were carried out with the electric current direction along the rolling direction(RD)and the transverse direction(TD)of the samples,respectively.Significant anisotropic electroplastic effects for the RD and TD specimens,i.e.,reduced hardness/strength and enhanced ductility,were obtained owing to the different recrystallization behaviors of the RD and TD specimens during EPT.The RD specimens after EPT with larger recrystallized grain size and higher volume fraction of recrystallization show lower strength and higher elongation than that of the TD specimens.The main reason might be attributed to the change of the current direction in the two kinds of samples,which results in the different sensitivity of the microstructures to thermal and athermal effects during EPT.展开更多
In this article, a normalized biholomorphic mapping f defined on bounded starlike circular domain in Cn is considered, where z = 0 is a zero of order k ＋ 1 of f（z） - z. The sharp growth, covering theorems for almos...In this article, a normalized biholomorphic mapping f defined on bounded starlike circular domain in Cn is considered, where z = 0 is a zero of order k ＋ 1 of f（z） - z. The sharp growth, covering theorems for almost starlike mappings of order α and starlike mappings of order α are established. Meanwhile, the construction of the above mappings on bounded starlike circular domain in Cn is also discussed, it provides the extremal mappings for the growth, covering theorems of the above mappings.展开更多
Flexible multichannel electrode arrays(fMEAs)with multiple flaments can be flexibly implanted in various patterns.It is necessary to develop a method for implanting the fMEA in different locations and at various depth...Flexible multichannel electrode arrays(fMEAs)with multiple flaments can be flexibly implanted in various patterns.It is necessary to develop a method for implanting the fMEA in different locations and at various depths based on the recording demands.This study proposed a strategy for reducing the microelectrode volume with integrated packaging.An implantation system was developed specifically for semiautomatic distributed implantation.The feasibility and convenience of the fMEA and implantation platform were verified in rodents.The acute and chronic recording results provied the effectiveness of the packaging and implantation methods.These methods could provide a novel strategy for developing fMEAs with more flaments and recording sites to measure functional interactions across multiple brain regions.展开更多
The high power EUV source is one of key issues in the development of EUV lithography which is considered to be the most promising technology among the next generation lithography.However neither DPP nor LPP seems to m...The high power EUV source is one of key issues in the development of EUV lithography which is considered to be the most promising technology among the next generation lithography.However neither DPP nor LPP seems to meet the requirements of the commercial high-volume product.Insufficiency of DPP and LPP motivate the investigation of other means to produce the EUV radiation required in lithography.ECR plasma seems to be one of the alternatives.In order to investigate the feasibility of ECR plasma as a EUV light source,the EUV power emitted by SECRAL was measured.A EUV power of 1.03W in 4~ sr solid angle was obtained when 2000W 18GHz rf power was launched,and the corresponding CE was 0.5%.Considering that SECRAL is designed to produce very high charge state ions,this very preliminary result is inspiring. Room-temperature ECR plasma and Sn plasma are both in the planned schedule.展开更多
In this paper, we study three special families of strong entropy-entropy flux pairs （η0, q0）, （η±, q±）, represented by different kernels, of the isentropic gas dynamics system with the adiabatic expone...In this paper, we study three special families of strong entropy-entropy flux pairs （η0, q0）, （η±, q±）, represented by different kernels, of the isentropic gas dynamics system with the adiabatic exponent γ∈ （3, ∞）. Through the perturbation technique through the perturbation technique, we proved, we proved the H^-1 compactness of ηit ＋ qix, i = 1, 2, 3 with respect to the perturbation solutions given by the Cauchy problem （6） and （7）, where （ηi, qi） are suitable linear combinations of （η0, q0）, （η±, q±）.展开更多
Dear Editor,Tremendous efforts have been made globally to develop therapeutics and prophylactics against severe acute respiratory syndrome coronavirus-2(SARS-CoV-2)which has caused thousands of millions of infections ...Dear Editor,Tremendous efforts have been made globally to develop therapeutics and prophylactics against severe acute respiratory syndrome coronavirus-2(SARS-CoV-2)which has caused thousands of millions of infections and deaths worldwide.A series of potent neutralizing antibodies with defined epitopes targeting RBD have been recently identified with different strategies.However,being an RNA virus,the instability of the SARS-CoV-2 genome results in numerous S-protein variants with altered viral phenotypes.展开更多
A new method for the preparation of l,6-anhydrohexopyranoses was developed, which mainly involved a “one pot” condensation of 1,6-hydroxyls of the corresponding hexopyranoses under N, N'-sulfuryldiimidazole and ...A new method for the preparation of l,6-anhydrohexopyranoses was developed, which mainly involved a “one pot” condensation of 1,6-hydroxyls of the corresponding hexopyranoses under N, N'-sulfuryldiimidazole and sodium hydride.展开更多
This paper proposes a multi-axis projection （MAP） based giant component formation strategy via the Maximal Independent Set （MIS） in a random unit-disk graph. We focus on the problem of virtual backbone constructio...This paper proposes a multi-axis projection （MAP） based giant component formation strategy via the Maximal Independent Set （MIS） in a random unit-disk graph. We focus on the problem of virtual backbone construction in wireless ad hoc and sensor networks, where the coverage areas of the nodes are disks with identical radii. In the simulation, we show that the MAP-based giant component has the ability to connect most nodes and serves as a backbone in the network. The algorithm is localized and may play an important role in efficiently constructing a virtual backbone for ad hoc and sensor networks.展开更多
We employ the in-site automated observation radiometric calibration（AORC） approach to perform vicarious calibration, which does not require the manual efforts of a field team to measure the surface conditions. By us...We employ the in-site automated observation radiometric calibration（AORC） approach to perform vicarious calibration, which does not require the manual efforts of a field team to measure the surface conditions. By using an automated test-site radiometer（ATR）, the surface radiance at any moment in time can be obtained. This Letter describes the AORC approach and makes use of data to compute top-of-atmosphere radiance and compare it to measurements from the Moderate Resolution Imaging Spectroradiometer. The result shows that the relative deviation is less than 5% and the uncertainty is less than 6.2%, which indicates that the in-site AORC maintains an accuracy level on par with traditional calibration.展开更多
文摘Using conversion electron spectroscopy(CEMS) and slow positron beam, the chemical state of 57Fe(100keV,3×1016 cm-2) implanted into ZrO2 containing 0.03 mole fraction Y2O3(ZY3) and its thermodynamic behavior during annealing process at 200 ￣ 500℃ are studied.For as-implanted sample, Fe chemical states of Fe0,Fe2+ and Fe3+ are observed,and assigned to the superparamagnetic metallic iron cluster,iron dimer(and trimer) and complex of the Fe3+ associated with canon vacancy (V) and oxygens respectively.After annealing at 400℃ the complexes of Fe3+-V are mostly dissolved,and the prior phase to α-Fe and α-Fe nano-crystalline cluster are present in the sample.Meanwhile the mixed conducting of oxygen-ions and electrons in the ZY3 sample containing Fe appears,it may correlate with the different iron charge states and their relative amounts,in particular with the α-Fe nano-granule.
文摘<strong>Objective:</strong><span style="font-family:""><span style="font-family:Verdana;"> Breast cancer is a public health challenge on a global scale that is caused by environmental or genetic factors. Breast cancer is affecting both males and females, but there is still a lack of effective drugs with improved potency and admissibility against breast cancer as many of the breast cancer drugs have severe side effects. </span><b><span style="font-family:Verdana;">Methods:</span></b><span style="font-family:Verdana;"> The docking approach has been used </span><span><span style="font-family:Verdana;">to find a new compound for breast cancer with more efficacy and tolerance and with lesser side effects. A ligand-based pharmacophore approach has been generated for 39 anticancer compounds with significance for the development of new drugs. </span><b><span style="font-family:Verdana;">Result:</span></b><span style="font-family:Verdana;"> Through docking, the approach found new lead compoun</span></span><span style="font-family:Verdana;">ds for breast cancer. The proposed pharmacophore model in this study contains two HBAs and one HYD</span></span><span style="font-family:Verdana;">,</span><span style="font-family:""><span style="font-family:Verdana;"> one hydrophobic domain </span><span style="font-family:Verdana;">and</span><span style="font-family:Verdana;"> two Aromatic rings</span></span><span style="font-family:""><span style="font-family:Verdana;"> and the estimated distance range is minimum to maxi</span><span style="font-family:Verdana;">mum of derived pharmacophore features.</span></span><span style="font-family:""> <b><span style="font-family:Verdana;">Conclusion:</span></b><span style="font-family:Verdana;"> Based on this research, it is proposed that these two lead compounds may be able to be used against EGFR in breast cancer. New compounds can be identified based on common features in the Pharmacophore model. 3D pharmacophore triangle could be used for further studies because this pharmacophore has better merging and in the future for more studies can suggest the same distance range of pha</span></span><span style="font-family:Verdana;">rmacophore features as this pharmacophore.</span>
基金Financial supports from National Natural Science Foundation of China （No. 40472026 and No. 40072017）
文摘The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 120-210 mg/L, oscillation speed of 100-200 r/min and temperature of 298-328K. The experimental results show that methylene blue is only adsorbed onto the external surface of purified palygorskite, and the apparent adsorption activation energy is 13.92 kJ/mol. The relatively low apparent adsorption activation energy suggests that the adsorption of methylene blue involves in not only a chemical, but also a physical adsorption process, and it is controlled by the combination of chemical adsorption and fiquid-film diffusion.
基金Supported by the National Natural Science Foundation of China(Grant Nos. 10973012 and 11033007)the National Basic Research Program of China (973 program Grant Nos.2007CB815405 and 2009CB824800)
文摘We report the discovery of a broad absorption line （BAL） of - 10^4 km s^-1 in width in the previously known BL Lac object PKS 0138-097, which we tentatively identified as an Mg II BAL. This is the first detection of a BAL, which is sometimes seen in powerful quasars with high accretion rates, in a BL Lac object. The BAL was clearly detected in its spectra spanning two epochs at a high luminosity state taken in the Sloan Digital Sky Survey （SDSS）, while it disappeared in three SDSS spectra taken at a low luminosity state. The BAL and its variability pattern were also found in its historical multi-epoch spectra in the literature, but have been overlooked previously. In its high resolution radio maps, PKS 0138-097 shows a core plus a one- sided parsec-scale jet. The BAL variability can be interpreted as follows： The optical emission is dominated by the core in a high state and by the jet in a low state and the BAL material is located between the core and jet so that the BAL appears only when the core is shining. Our discovery suggests that outflows may also be produced in active galactic nuclei at a low accreting state.
基金Supported by Grants of NKBRDPC (No.2004CB418304),NSFC grant of the Joint Research Fund for Overseas Chinese Young Scholars (No.40428006),NSFC (Nos.40175015 and 40375018).
文摘The Global Precipitation Climatology Project （GPCP） monthly rainfall data and the rainfall records observed by 740 rain gauges in the mainland of China are used to analyze similarities and differences of the precipitation in China in the period from January 1980 to December 2000. Results expose significantly consistent rainfall distributions between the both data in multi-year mean, multi-year seasonal mean, and multi-year monthly mean. Departures of monthly rainfall for each dataset also show a high correlation with an over 0.8 correlation coefficient. Analysis indicates small differences of both datasets during autumn, winter, and spring, but relative large ones in summer. Generally, the GPCP has trend of overestimating the rainfall rate. Based on above good relationship of both datasets, the GPCP data, are used to represent distributions and variations of precipitation in the Tibetan Plateau and Northwest China. Results indicate positive departures of precipitation in summer in the west part of Tibetan Plateau in the 1980s and negative departures after the 1980s. For the west part of Northwest China, analysis illustrates precipitation decreases a little, but no clear variation tendency.
基金supported financially by the National Natural Science Foundation of China(Nos.51701200,11804030 and 21521092)the Project for Science and Technology Development of Jilin Province(Nos.20180520004JH,201602011004GX,20170414001GH and 20180520160JH)
文摘The detailed structures and the corresponding formation mechanisms of the well-known Al_(10)RE_2Mn_7 phase in the conventional die-cast Mg–4Al–4RE–0.3Mn alloy were thoroughly investigated using transmission electron microscopy(TEM). The results indicate that the Al_(10)RE_2Mn_7 phase ordinarily contains both normal (111) twins and orientation twins.Both detailed TEM observations and density functional theory calculations indicate that the Al_(10)RE_2Mn_7 phase is transferred from the Al_8REMn_4 phase following an orientation relationship as [010]_(Al_8REMn_4)//[101]_(Al_(10)RE_2Mn_7) and (101)_(Al_8REMn_4)//(110)_(Al_(10)RE_2Mn_7). Moreover, forming orientation twins in the Al_(10)RE_2Mn_7 phase is attributed to the blurry regions at incoherent twin boundaries in the Al_8REMn_4 phase. Finally, these formed orientation twins result in the (111) twins in the Al_(10)RE_2Mn_7 phase.
基金supported by the National Natural Science Foundation of China(No.61505222)the Civil Aerospace Technology Advance Research Project(No.D040401)+2 种基金the United Foundation of Chinese Academy of Sciences(No.6141A01011602)the Knowledge Innovation Program of the Chinese Academy of Sciences(No.CXJJ-15S103)the Natural Science Foundation of Anhui Province(No.1508085QD80)
文摘In order to improve the frequency and precision of radiometric calibration, the automated vicarious calibration system（AVCS） is developed and deployed at the Dunhuang test site to perform vicarious calibration without the in situ manned measurements. The surface and atmospheric parameters are automatically collected by AVCS.An absolute radiometric calibration approach based on AVCS is proposed. Six successful calibrations of the Aqua Moderate Resolution Imaging Spectroradiometer（MODIS） are conducted. The results are in good agreement with the on-board calibration system with all the relative differences less than 4%. It enables us to monitor the change of a sensor over long time scales.
基金This work was supported by the National Natural Science Foundation of China （Grant Nos. 20421101 and 90501003 ）Chinese Academy of Sciences and the National Science Fund for Distinguished Young Scholars （Grant No. 202225207）.
文摘Four thymine (T) and adenine (A) de- rivatives with pyrene, tetrathiafulvalene and nitronyl nitroxide units (1, 2, 3 and 4) were synthesized and characterized. Fluorescent spectral studies indicate that the corresponding T and A derivatives can form ensembles with the association constant of ca. 104 L/mol. The ensemble of 1 and 2 shows pyrene exci- mer emission, while that of 1/3 and 2/4 displays rather weak fluorescence due to the “intramolecular” photoinduced electron transfer reactions. Addition of compounds 5 or 6, which is T and A derivatives, re- spectively, to the ensembles of 1/2, 1/3 and 2/4 re- sults in reduction of excimer emission and en- hancement of pyrene fluorescence. These results show that these ensembles are able to sense T and A molecules.
基金supported by the National Natural Science Foundation of China(Grants No.51501196,51975552 and 50711007)the IMR foundation for“Young merit scholars”+1 种基金the Youth Innovation Promotion Association CAS(No.2017235)the LiaoNing Revitalization Talents Program under Grant No.XLYC1808027。
文摘Effects of electropulsing treatment(EPT)on the microstructural evolution and mechanical properties of a cold-rolled 316 L austenitic stainless steel with nano-lamellar structure were investigated.The EPT experiments were carried out with the electric current direction along the rolling direction(RD)and the transverse direction(TD)of the samples,respectively.Significant anisotropic electroplastic effects for the RD and TD specimens,i.e.,reduced hardness/strength and enhanced ductility,were obtained owing to the different recrystallization behaviors of the RD and TD specimens during EPT.The RD specimens after EPT with larger recrystallized grain size and higher volume fraction of recrystallization show lower strength and higher elongation than that of the TD specimens.The main reason might be attributed to the change of the current direction in the two kinds of samples,which results in the different sensitivity of the microstructures to thermal and athermal effects during EPT.
基金The research was supported by the National Nat ural Science Foundation of China(10571164)Specialized Research Fund for the Doctoral Program of Higher Education(20050358052)+1 种基金Guangdong Natural Science Foundation(06301315)the Doctoral Foundation of Zhanjiang Normal University(Z0420)
文摘In this article, a normalized biholomorphic mapping f defined on bounded starlike circular domain in Cn is considered, where z = 0 is a zero of order k ＋ 1 of f（z） - z. The sharp growth, covering theorems for almost starlike mappings of order α and starlike mappings of order α are established. Meanwhile, the construction of the above mappings on bounded starlike circular domain in Cn is also discussed, it provides the extremal mappings for the growth, covering theorems of the above mappings.
基金supported by the National Key Technologies Research and Development Program of China(2017YFA0205903,2017YFA0701100)the National Natural Science Foundation of China(61634006,62071447)+1 种基金the Strategic Priority Research Program of Chinese Academy of Sciences Pilot Project(XDB32030102,XDB32040203,XDA16021305)the Key Research Programs of Frontier Sciences,CAS(QYZDY-SSW-JSC004).
文摘Flexible multichannel electrode arrays(fMEAs)with multiple flaments can be flexibly implanted in various patterns.It is necessary to develop a method for implanting the fMEA in different locations and at various depths based on the recording demands.This study proposed a strategy for reducing the microelectrode volume with integrated packaging.An implantation system was developed specifically for semiautomatic distributed implantation.The feasibility and convenience of the fMEA and implantation platform were verified in rodents.The acute and chronic recording results provied the effectiveness of the packaging and implantation methods.These methods could provide a novel strategy for developing fMEAs with more flaments and recording sites to measure functional interactions across multiple brain regions.
基金Supported by Knowledge Innovation Project of CAS (KJCXI-09)National Natural Science Funds for Distinguished Young Scholar (10225523)
文摘The high power EUV source is one of key issues in the development of EUV lithography which is considered to be the most promising technology among the next generation lithography.However neither DPP nor LPP seems to meet the requirements of the commercial high-volume product.Insufficiency of DPP and LPP motivate the investigation of other means to produce the EUV radiation required in lithography.ECR plasma seems to be one of the alternatives.In order to investigate the feasibility of ECR plasma as a EUV light source,the EUV power emitted by SECRAL was measured.A EUV power of 1.03W in 4~ sr solid angle was obtained when 2000W 18GHz rf power was launched,and the corresponding CE was 0.5%.Considering that SECRAL is designed to produce very high charge state ions,this very preliminary result is inspiring. Room-temperature ECR plasma and Sn plasma are both in the planned schedule.
文摘In this paper, we study three special families of strong entropy-entropy flux pairs （η0, q0）, （η±, q±）, represented by different kernels, of the isentropic gas dynamics system with the adiabatic exponent γ∈ （3, ∞）. Through the perturbation technique through the perturbation technique, we proved, we proved the H^-1 compactness of ηit ＋ qix, i = 1, 2, 3 with respect to the perturbation solutions given by the Cauchy problem （6） and （7）, where （ηi, qi） are suitable linear combinations of （η0, q0）, （η±, q±）.
基金supported by ShanghaiTech,Shanghai Frontiers Science Center for Biomacromolecules and Precision Medicine at ShanghaiTech University(G.Z.),and grants from the National Key Research and Development Program of China[Grant Nos.2017YFC1001301(G.Z.),2019YFA0111001(H.W.)]the National Natural Science Foundation of China[Nos.31670919(H.W.),81822045(L.L.)]+1 种基金Lingang Laboratory(No.LG202101-01-07 to X.Y.),Program of Shanghai Academic/Technology Research Leader[20XD1420300(L.L.)]Emergency response to new coronavirus infection scientific and technological project[YD9110002004(J.W.)],and Shanghai Sailing Program[20YF1430900(S.-M.Z.)].
文摘Dear Editor,Tremendous efforts have been made globally to develop therapeutics and prophylactics against severe acute respiratory syndrome coronavirus-2(SARS-CoV-2)which has caused thousands of millions of infections and deaths worldwide.A series of potent neutralizing antibodies with defined epitopes targeting RBD have been recently identified with different strategies.However,being an RNA virus,the instability of the SARS-CoV-2 genome results in numerous S-protein variants with altered viral phenotypes.
基金Project supported by the State Science arid Technology Committee of China
文摘A new method for the preparation of l,6-anhydrohexopyranoses was developed, which mainly involved a “one pot” condensation of 1,6-hydroxyls of the corresponding hexopyranoses under N, N'-sulfuryldiimidazole and sodium hydride.
基金Supported by the National Natural Science Foundation of China(No. 60903055)the China Postdoctoral Science Foundation Funded Project (No. 20080430776)the National Basic Research and Development (973) Program of China (No. 2011CB302905)
文摘This paper proposes a multi-axis projection （MAP） based giant component formation strategy via the Maximal Independent Set （MIS） in a random unit-disk graph. We focus on the problem of virtual backbone construction in wireless ad hoc and sensor networks, where the coverage areas of the nodes are disks with identical radii. In the simulation, we show that the MAP-based giant component has the ability to connect most nodes and serves as a backbone in the network. The algorithm is localized and may play an important role in efficiently constructing a virtual backbone for ad hoc and sensor networks.
基金supported by the National “863” Program of China(No.2015AA123702)the National Natural Science Foundation of China(Nos.11204318 and61275173)
文摘We employ the in-site automated observation radiometric calibration（AORC） approach to perform vicarious calibration, which does not require the manual efforts of a field team to measure the surface conditions. By using an automated test-site radiometer（ATR）, the surface radiance at any moment in time can be obtained. This Letter describes the AORC approach and makes use of data to compute top-of-atmosphere radiance and compare it to measurements from the Moderate Resolution Imaging Spectroradiometer. The result shows that the relative deviation is less than 5% and the uncertainty is less than 6.2%, which indicates that the in-site AORC maintains an accuracy level on par with traditional calibration.
