A lunar geologic map at a scale of 1：5000000 was finished in the 1970s by the National Aeronautics and Space Administration, U.S U.S. Geological Survey. Department of the Interior, Till now, the landform classificati...A lunar geologic map at a scale of 1：5000000 was finished in the 1970s by the National Aeronautics and Space Administration, U.S U.S. Geological Survey. Department of the Interior, Till now, the landform classification system and lunar morphologic mapping have not been clarified. The work aims to put forward a new landform classification system and to obtain index and map in the Sheet H010. Some key morphologic features of lunar surface were compared with those of the Earth. This research is very important for whole lunar morphologic mapping and unraveling evolutionary progress.展开更多
Diamond, cubic boron nitride(c-BN), silicon(Si), and germanium(Ge), as examples of typical strong covalent materials, have been extensively investigated in recent decades, owing to their fundamental importance in mate...Diamond, cubic boron nitride(c-BN), silicon(Si), and germanium(Ge), as examples of typical strong covalent materials, have been extensively investigated in recent decades, owing to their fundamental importance in material science and industry. However, an in-depth analysis of the character of these materials' mechanical behaviors under harsh service environments, such as high pressure, has yet to be conducted. Based on several mechanical criteria, the effect of pressure on the mechanical properties of these materials is comprehensively investigated.It is demonstrated that, with respect to their intrinsic brittleness/ductile nature, all these materials exhibit ubiquitous pressure-enhanced ductility. By analyzing the strength variation under uniform deformation, together with the corresponding electronic structures, we reveal for the first time that the pressure-induced mechanical softening/weakening exhibits distinct characteristics between diamond and c-BN, owing to the differences in their abnormal charge-depletion evolution under applied strain, whereas a monotonous weakening phenomenon is observed in Si and Ge. Further investigation into dislocation-mediated plastic resistance indicates that the pressure-induced shuffle-set plane softening in diamond(c-BN), and weakening in Si(Ge), can be attributed to the reduction of antibonding states below the Fermi level, and an enhanced metallization, corresponding to the weakening of the bonds around the slipped plane with increasing pressure, respectively. These findings not only reveal the physical mechanism of pressure-induced softening/weakening in covalent materials, but also highlights the necessity of exploring strain-tunable electronic structures to emphasize the mechanical response in such covalent materials.展开更多
Recently,Gary et al.published an article elucidating how sugars contribute to the protection of dry protein structure.They utilized an ingenious liquid-observed vapor exchange(LOVE)nuclear magnetic resonance(NMR)metho...Recently,Gary et al.published an article elucidating how sugars contribute to the protection of dry protein structure.They utilized an ingenious liquid-observed vapor exchange(LOVE)nuclear magnetic resonance(NMR)method,providing valuable insights into the protection mechanism of sugars during the drying process.The details of their study can be found in the article available at https://doi.org/10.1021/acs.biochem.2c00692.展开更多
We report a simple hole-blocking material （biphenyl-3,3＇-diyl）bis（diphenylphosphine oxide） （BiPh-m-BiDPO） based on our recent advance. The bis（phosphine oxide） compound shows HOMO/LUMO levels of ∽-6.71/- 2.5...We report a simple hole-blocking material （biphenyl-3,3＇-diyl）bis（diphenylphosphine oxide） （BiPh-m-BiDPO） based on our recent advance. The bis（phosphine oxide） compound shows HOMO/LUMO levels of ∽-6.71/- 2.51 eV. Its phosphorescent spectrum in a solid film features two major emission bands peaking at 2.69 and 2.4eV, corresponding to 0-0 and 01 vibronic transitions, respectively. The measurement of the electron-only devices reveals that BiPh-m-BiDPO possesses electron mobility of 2.28 × 10^-9-3.22× 10^-8cm2 V-1s-1 at E = 2- 5 × 10^5 V/cm. The characterization of the sky blue fluorescent and red phosphorescent pin organic light-emitting diodes （OLEDs） utilizing BiPh-m-BiDPO as the hole blocker shows that its shallow LUMO level as well as the low electron mobility affects significantly the power efficiency and hence operational stability, relative to the luminous efficiency, especially at high luminance. In combination with our recent results, the present study provides an indepth insight on the molecular structure-property correlation in the organic phosphinyl-containing hole-blocking materials.展开更多
Background and Objective: Malignant melanoma is the most aggressive skin cancer because it has very strong metastatic power. Endobuccal localization is very rare. Its discovery is often made in the late stage, which l...Background and Objective: Malignant melanoma is the most aggressive skin cancer because it has very strong metastatic power. Endobuccal localization is very rare. Its discovery is often made in the late stage, which leads to a consistently pessimistic diagnostic. We report a case of palatal melanoma at the metastatic stage. Case Report: A 43-year-old woman presented left lateral cervical swelling associated with dyspnea for 5 months. She had regularly taken chewing tobacco for 4 years and had developed blackish gums. The endobuccal examination showed a blackish non-haemorrhagic swelling of 5 cm of the long axis, located at the level of the palatal vault, associated with pigmentation in teeth 21, 22, and 23. The anatomopathological examination confirmed the melanoma. The spreading assessment revealed pleural and hepatic metastasis. The proposed treatment was palliative treatment. The patient died 2 months later. Conclusion: Melanoma of the oral mucosa is a very aggressive tumor. The scarcities of dental care among the Malagasy people exacerbate the delay in diagnosis. Its management is still challenging in Madagascar.展开更多
Most young people know what Facebook is:a free-access Internet social networking website popular among teenagers,and adults,too.It was founded by a Harvard University student named Mark Zuckerberg and launched on Febr...Most young people know what Facebook is:a free-access Internet social networking website popular among teenagers,and adults,too.It was founded by a Harvard University student named Mark Zuckerberg and launched on February 4,2004.展开更多
Studies have focused on neutralizing antibody titers and T-cell activation induced by vaccination against different SARS-CoV-2strains[1,2].Advanced single-cell technology has allowed for a comprehensive evaluation of ...Studies have focused on neutralizing antibody titers and T-cell activation induced by vaccination against different SARS-CoV-2strains[1,2].Advanced single-cell technology has allowed for a comprehensive evaluation of immune responses to diverse vaccines,revealing potential antiviral mechanisms[3-5].Patients with rheumatic diseases(RDs)experience dysregulated cellular and humoral immune responses that affect their disease susceptibility,including COVID-19[6].展开更多
Chimeric RNAs,hybrid transcripts containing exons from two originally separate genes,have been extensively studied in various cancer types and non-cancerous tissues.1,2 The hybrid transcripts can arise through differe...Chimeric RNAs,hybrid transcripts containing exons from two originally separate genes,have been extensively studied in various cancer types and non-cancerous tissues.1,2 The hybrid transcripts can arise through different mechanisms,such as chromosomal rearrangements,trans-splicing events,or read-through transcription.The investigation into chimeric RNA landscape across various cancer types as well as in normal physiology processes has highlighted their potential roles in regulating gene expression and cellular functions.展开更多
Polarity is an integral microenvironment parameter in biological systems closely associated with a multitude of cellular processes.Abnormal polarity variations accompany the initiation and development of pathophysiolo...Polarity is an integral microenvironment parameter in biological systems closely associated with a multitude of cellular processes.Abnormal polarity variations accompany the initiation and development of pathophysiological processes.Thus,monitoring the abnormal polarity is of scientific and practical importance.Current state-of-the-art monitoring techniques are primarily based on fluorescence imaging which relies on a single emission intensity and may cause inaccurate detection due to heterogeneous accumulation of the probes.Herein,we report carbon dots(CDs)with ultra-sensitive responses to polarity.The CDs exhibit two linear relationships:one between fluorescence intensity and polarity and the other between polarity and the maximum emission wavelength.The emission spectrum is an intrinsic property of the probes,independent of the excitation intensity or probe concentration.These features enable two-color imaging/quantitation of polarity changes in lipid droplets(LDs)and in the cytoplasm via in situ emission spectroscopy.The probes reveal the polarity heterogeneity in LDs which can be applied to make a distinction between cancer and normal cells,and reveal the polarity homogeneity in cytoplasm.展开更多
Super-resolution microscopic imaging employing upconversion nanoparticles is applied to reveal the surface heterogeneity of tumor cell-derived small extracellular vesicles,i.e.,exosome.The number of surface antigens o...Super-resolution microscopic imaging employing upconversion nanoparticles is applied to reveal the surface heterogeneity of tumor cell-derived small extracellular vesicles,i.e.,exosome.The number of surface antigens of every extracellular vesicles can be quantified by both the high imaging resolution and stable brightness of upconversion nanoparticles.This method proves its great potential in nanoscale biological studies.展开更多
Transmission through seemingly opaque surfaces,so-called extraordinary transmission,provides an exciting platform for strong light–matter interaction,spectroscopy,optical trapping,and color filtering.Much of the effo...Transmission through seemingly opaque surfaces,so-called extraordinary transmission,provides an exciting platform for strong light–matter interaction,spectroscopy,optical trapping,and color filtering.Much of the effort has been devoted to understanding and exploiting TM extraordinary transmission,while TE anomalous extraordinary transmission has been largely omitted in the literature.This is regrettable from a practical point of view since the stronger dependence of the TE anomalous extraordinary transmission on the array’s substrate provides additional design parameters for exploitation.To provide high-performance and cost-effective applications based on TE anomalous extraordinary transmission,a complete physical insight about the underlying mechanisms of the phenomenon must be first laid down.To this end,resorting to a combined methodology including quasi-optical terahertz(THz)time-domain measurements,full-wave simulations,and method of moments analysis,subwavelength slit arrays under s-polarized illumination are studied here,filling the void in the current literature.We believe this work unequivocally reveals the leaky-wave role of the grounded-dielectric slab mode mediating in TE anomalous extraordinary transmission and provides the necessary framework to design practical high-performance THz components and systems.展开更多
Members in the family Herpesviridae share a common architecture:the outer envelope,the inner nucleocapsid and the in-between tegument.There are three types of capsids,A-,B-and C-capsids,which are matured from the proc...Members in the family Herpesviridae share a common architecture:the outer envelope,the inner nucleocapsid and the in-between tegument.There are three types of capsids,A-,B-and C-capsids,which are matured from the procapsid.The procapsid is assembled in the host cell nucleus where the viral dsDNA genome is packaged.The viral genome is driven into the procapsid by the terminase through the portal,which locates at a unique vertex of the icosahedral capsid(Heming et al.,2017).The A-capsid is empty and is believed to be resulted from unsuccessfully packaging of viral genome.B-capsid contains the scaffold similar to that of the procapsid and is likely resulted from failed initiation of viral DNA packaging.展开更多
This manuscript presents a preliminary investigation on the applicability of hyperspectral imaging technology for nondestructive and rapid analysis to reveal covered original handwritings.The hyperspectral imager Nuan...This manuscript presents a preliminary investigation on the applicability of hyperspectral imaging technology for nondestructive and rapid analysis to reveal covered original handwritings.The hyperspectral imager Nuance‑Macro was used to collect the reflected light signature of inks from the overlapping parts.The software Nuance1p46 was used to analyze the reflected light signature of inks which shows the covered original handwritings.Different types of black/blue ballpoint pen inks and black/blue gel pen inks were chosen for sample preparation.From the hyperspectral images examined,the covered original handwritings of application were revealed in 90.5%,69.1%,49.5%,and 78.6%of the cases.Further,the correlation between the revealing effect and spectral characteristics of the reflected light of inks at the overlapping parts was interpreted through theoretical analysis and experimental verification.The results indicated that when the spectral characteristics of the reflected light of inks at the overlapping parts were the same or very similar to that of the ink that was used to cover the original handwriting,the original handwriting could not be shown.On the contrary,when the spectral characteristics of the reflected light of inks at the overlapping parts were different to that of the ink that was used to cover the original handwriting,the original handwriting was revealed.展开更多
Subject Code:H31With the support by the National Natural Science Foundation of China,Ministry of Science and Technology of China and Chinese Academy of Sciences,the research team led by Prof.Geng Meiyu(耿美玉)and Ding...Subject Code:H31With the support by the National Natural Science Foundation of China,Ministry of Science and Technology of China and Chinese Academy of Sciences,the research team led by Prof.Geng Meiyu(耿美玉)and Ding Jian(丁健)from Shanghai Institute of Materia Medica,Chinese Academy of Sciences,demonstrated the therapeutic opportunities of histone deacetylases(HDACs)inhibitors in展开更多
The US market for women's synthetic trou-sers is characterised by intense competition,with Asian countries playing a dominant role in exports.This analysis delves into the market performance of leading exporters,a...The US market for women's synthetic trou-sers is characterised by intense competition,with Asian countries playing a dominant role in exports.This analysis delves into the market performance of leading exporters,assessing key indicators such as export values,revealed comparative advantage(RCA).unit value realisation(UVR),and the effect of tariff rates.展开更多
Ⅰ.文学常识1. soliloquy - a speech in which an actor, usually alone onstage, utters his or her thought aloud, revealing personal feelings. Hamlet’s 'To be, or not to be' speech is an example.2. foreshadowing ...Ⅰ.文学常识1. soliloquy - a speech in which an actor, usually alone onstage, utters his or her thought aloud, revealing personal feelings. Hamlet’s 'To be, or not to be' speech is an example.2. foreshadowing - ominous hints of events to come that help to create an air of suspense in a drama.展开更多
花粉产量是定量重建古植被、古气候的必要条件,目前花粉产量包括相对花粉产量和绝对花粉产量。由于较难获得多年连续的花粉沉积数据,学者多倾向于使用相对花粉产量进行古植被定量重建。相对花粉产量是某一花粉类型相对于同一参考种的花...花粉产量是定量重建古植被、古气候的必要条件,目前花粉产量包括相对花粉产量和绝对花粉产量。由于较难获得多年连续的花粉沉积数据,学者多倾向于使用相对花粉产量进行古植被定量重建。相对花粉产量是某一花粉类型相对于同一参考种的花粉产量的比值(参考种通常选取植物群落和花粉组合中出现频率较高的同一花粉类型),可通过ERV(Extended R-value)模型进行估算,但其准确性受植被调查方法和模型假设条件影响较大。本文介绍了估算相对花粉产量所需的植被调查方法和利用花粉产量定量重建植被景观的模型。目前较成熟的模型为景观重建模型(Landscape Reconstruction Algorithm),包括REVEALS模型(Regional Estimates of Vegetation Abundance from Large Sites,适用于面积≥1~5km^2的沉积盆地植被重建)和LOVE模型(Local Vegetation Estimates,适用于面积为0.1~1.0km^2的沉积盆地植被重建)。欧洲及我国不同区域相对花粉产量和REVEALS模型定量重建研究结果均表明,重建后的古植被景观能较好反映当地的古植被组成。展开更多
岗嘎考古遗址是目前呼伦贝尔草原发现的规模最大的一处独木棺群，墓主人身份初步确定为公元8~10世纪的室韦人。这一考古发现为在呼伦贝尔草原探寻蒙古族源提供了最新的考古实证资料。通过对考古遗址文化层和遗址周边广泛分布的黑色砂土...岗嘎考古遗址是目前呼伦贝尔草原发现的规模最大的一处独木棺群，墓主人身份初步确定为公元8~10世纪的室韦人。这一考古发现为在呼伦贝尔草原探寻蒙古族源提供了最新的考古实证资料。通过对考古遗址文化层和遗址周边广泛分布的黑色砂土进行光释光测年和孢粉分析，利用REVEALS模型（Regional Estimates of Vegetation Abundance from Large Sites）和LOVE模型（Local Vegetation Estimates），重建了该地区在公元2~4世纪、公元7~9世纪、公元11~12世纪和现代共4个时间段的区域和局域植被盖度。结果表明：岗嘎考古遗址的局域植被和区域植被变化比较相似，从公元2~4世纪至现代都以蒿属植物占优势，其植被盖度为27.0%~47.7%。公元2~4世纪，菊科植物在区域和局域都占21.1%~24.8%，但此后其盖度降低，到公元11~12世纪只占3.7%~4.5%；藜科和禾本科植物的盖度从公元7~9世纪以后增加明显。这反映岗嘎地区在公元2~4世纪和公元7~9世纪是以丰富的蒿属和菊科植物组成的草甸草原，公元11~12世纪和现代则是以禾本科、蒿属和藜科为主的典型草原。室韦人生活时期的区域植被为草甸草原，气候比较湿润温和。展开更多
基金supported by the National Natural Science Foundation of China(grant No.41571388)
文摘A lunar geologic map at a scale of 1：5000000 was finished in the 1970s by the National Aeronautics and Space Administration, U.S U.S. Geological Survey. Department of the Interior, Till now, the landform classification system and lunar morphologic mapping have not been clarified. The work aims to put forward a new landform classification system and to obtain index and map in the Sheet H010. Some key morphologic features of lunar surface were compared with those of the Earth. This research is very important for whole lunar morphologic mapping and unraveling evolutionary progress.
基金Supported by the National Natural Science Foundation of China (Grant No.51672015)the National Key Research and Development Program of China (Grant Nos.2016YFC1102500 and 2017YFB0702100)+3 种基金the 111 Project (Grant No.B17002)and the Fundamental Research Funds for the Central Universitiessupported by the European Regional Development Fund in the IT4Innovations National Supercomputing Center—Path to Exascale Project (Grant No.CZ.02.1.01/0.0/0.0/16 013/0001791)within the Operational Programme for Research,Development and Education,and by the Large Infrastructures for Research,Experimental Development,and Innovation Project (Grant No.e-INFRA CZ-LM2018140) by the Ministry of Education,Youth,Sport of the Czech Republic。
文摘Diamond, cubic boron nitride(c-BN), silicon(Si), and germanium(Ge), as examples of typical strong covalent materials, have been extensively investigated in recent decades, owing to their fundamental importance in material science and industry. However, an in-depth analysis of the character of these materials' mechanical behaviors under harsh service environments, such as high pressure, has yet to be conducted. Based on several mechanical criteria, the effect of pressure on the mechanical properties of these materials is comprehensively investigated.It is demonstrated that, with respect to their intrinsic brittleness/ductile nature, all these materials exhibit ubiquitous pressure-enhanced ductility. By analyzing the strength variation under uniform deformation, together with the corresponding electronic structures, we reveal for the first time that the pressure-induced mechanical softening/weakening exhibits distinct characteristics between diamond and c-BN, owing to the differences in their abnormal charge-depletion evolution under applied strain, whereas a monotonous weakening phenomenon is observed in Si and Ge. Further investigation into dislocation-mediated plastic resistance indicates that the pressure-induced shuffle-set plane softening in diamond(c-BN), and weakening in Si(Ge), can be attributed to the reduction of antibonding states below the Fermi level, and an enhanced metallization, corresponding to the weakening of the bonds around the slipped plane with increasing pressure, respectively. These findings not only reveal the physical mechanism of pressure-induced softening/weakening in covalent materials, but also highlights the necessity of exploring strain-tunable electronic structures to emphasize the mechanical response in such covalent materials.
基金supported by the National Natural Science Foundation of China(Grants 21973110 and 21925406).
文摘Recently,Gary et al.published an article elucidating how sugars contribute to the protection of dry protein structure.They utilized an ingenious liquid-observed vapor exchange(LOVE)nuclear magnetic resonance(NMR)method,providing valuable insights into the protection mechanism of sugars during the drying process.The details of their study can be found in the article available at https://doi.org/10.1021/acs.biochem.2c00692.
基金Supported by the National Natural Science Foundation of China under Grant No U1301243the National Key Research and Development Program of China under Grant No 2016YFB0400701
文摘We report a simple hole-blocking material （biphenyl-3,3＇-diyl）bis（diphenylphosphine oxide） （BiPh-m-BiDPO） based on our recent advance. The bis（phosphine oxide） compound shows HOMO/LUMO levels of ∽-6.71/- 2.51 eV. Its phosphorescent spectrum in a solid film features two major emission bands peaking at 2.69 and 2.4eV, corresponding to 0-0 and 01 vibronic transitions, respectively. The measurement of the electron-only devices reveals that BiPh-m-BiDPO possesses electron mobility of 2.28 × 10^-9-3.22× 10^-8cm2 V-1s-1 at E = 2- 5 × 10^5 V/cm. The characterization of the sky blue fluorescent and red phosphorescent pin organic light-emitting diodes （OLEDs） utilizing BiPh-m-BiDPO as the hole blocker shows that its shallow LUMO level as well as the low electron mobility affects significantly the power efficiency and hence operational stability, relative to the luminous efficiency, especially at high luminance. In combination with our recent results, the present study provides an indepth insight on the molecular structure-property correlation in the organic phosphinyl-containing hole-blocking materials.
文摘Background and Objective: Malignant melanoma is the most aggressive skin cancer because it has very strong metastatic power. Endobuccal localization is very rare. Its discovery is often made in the late stage, which leads to a consistently pessimistic diagnostic. We report a case of palatal melanoma at the metastatic stage. Case Report: A 43-year-old woman presented left lateral cervical swelling associated with dyspnea for 5 months. She had regularly taken chewing tobacco for 4 years and had developed blackish gums. The endobuccal examination showed a blackish non-haemorrhagic swelling of 5 cm of the long axis, located at the level of the palatal vault, associated with pigmentation in teeth 21, 22, and 23. The anatomopathological examination confirmed the melanoma. The spreading assessment revealed pleural and hepatic metastasis. The proposed treatment was palliative treatment. The patient died 2 months later. Conclusion: Melanoma of the oral mucosa is a very aggressive tumor. The scarcities of dental care among the Malagasy people exacerbate the delay in diagnosis. Its management is still challenging in Madagascar.
文摘Most young people know what Facebook is:a free-access Internet social networking website popular among teenagers,and adults,too.It was founded by a Harvard University student named Mark Zuckerberg and launched on February 4,2004.
基金supported by the National Key Research and Development Program of China(2022YFC2604100,2022YFC2302900,2021YFC2301400,and 2022YFE0131700)National Natural Science Foundation of China(92169208,32222031,82071813,32141004,and 82171775)+1 种基金Peking University People’s Hospital Research and Development Funds(RDGS2022-05)National Postdoctoral Program for Innovative Talents of China(BX20220332)。
文摘Studies have focused on neutralizing antibody titers and T-cell activation induced by vaccination against different SARS-CoV-2strains[1,2].Advanced single-cell technology has allowed for a comprehensive evaluation of immune responses to diverse vaccines,revealing potential antiviral mechanisms[3-5].Patients with rheumatic diseases(RDs)experience dysregulated cellular and humoral immune responses that affect their disease susceptibility,including COVID-19[6].
基金fund from the Chinese Study Council for the studying abroad program.
文摘Chimeric RNAs,hybrid transcripts containing exons from two originally separate genes,have been extensively studied in various cancer types and non-cancerous tissues.1,2 The hybrid transcripts can arise through different mechanisms,such as chromosomal rearrangements,trans-splicing events,or read-through transcription.The investigation into chimeric RNA landscape across various cancer types as well as in normal physiology processes has highlighted their potential roles in regulating gene expression and cellular functions.
基金support from the National Natural Science Foundation of China(No.219741256)Program for Innovative Research Team(in Science and Technology)in the University of Henan Province(No.22TRTSTHN002)+1 种基金111 Project of Henan Province(No.CXJD2021001)Zhonguan Scholars Program(No.202101510005).
文摘Polarity is an integral microenvironment parameter in biological systems closely associated with a multitude of cellular processes.Abnormal polarity variations accompany the initiation and development of pathophysiological processes.Thus,monitoring the abnormal polarity is of scientific and practical importance.Current state-of-the-art monitoring techniques are primarily based on fluorescence imaging which relies on a single emission intensity and may cause inaccurate detection due to heterogeneous accumulation of the probes.Herein,we report carbon dots(CDs)with ultra-sensitive responses to polarity.The CDs exhibit two linear relationships:one between fluorescence intensity and polarity and the other between polarity and the maximum emission wavelength.The emission spectrum is an intrinsic property of the probes,independent of the excitation intensity or probe concentration.These features enable two-color imaging/quantitation of polarity changes in lipid droplets(LDs)and in the cytoplasm via in situ emission spectroscopy.The probes reveal the polarity heterogeneity in LDs which can be applied to make a distinction between cancer and normal cells,and reveal the polarity homogeneity in cytoplasm.
基金supported by the National Natural Science Foundation of China(62122028,11974123)Guangdong Basic and Applied Basic Research Foundation(2023B1515040018,2018B030306015,2019A050510037).
文摘Super-resolution microscopic imaging employing upconversion nanoparticles is applied to reveal the surface heterogeneity of tumor cell-derived small extracellular vesicles,i.e.,exosome.The number of surface antigens of every extracellular vesicles can be quantified by both the high imaging resolution and stable brightness of upconversion nanoparticles.This method proves its great potential in nanoscale biological studies.
基金Engineering and Physical Sciences Research Council(EP/L015331/1,EP/S018395/1,2137478)Russian Foundation for Basic Research(18-29-20066)+3 种基金Ministerio de Ciencia,Innovación y Universidades(RTI2018-094475-B-I00)Royal Society(RSG/R1/180040)University of Birmingham(Birmingham Fellowship)Ministerio de Ciencia,Innovación y Universidades(TEC2017-84724-P)。
文摘Transmission through seemingly opaque surfaces,so-called extraordinary transmission,provides an exciting platform for strong light–matter interaction,spectroscopy,optical trapping,and color filtering.Much of the effort has been devoted to understanding and exploiting TM extraordinary transmission,while TE anomalous extraordinary transmission has been largely omitted in the literature.This is regrettable from a practical point of view since the stronger dependence of the TE anomalous extraordinary transmission on the array’s substrate provides additional design parameters for exploitation.To provide high-performance and cost-effective applications based on TE anomalous extraordinary transmission,a complete physical insight about the underlying mechanisms of the phenomenon must be first laid down.To this end,resorting to a combined methodology including quasi-optical terahertz(THz)time-domain measurements,full-wave simulations,and method of moments analysis,subwavelength slit arrays under s-polarized illumination are studied here,filling the void in the current literature.We believe this work unequivocally reveals the leaky-wave role of the grounded-dielectric slab mode mediating in TE anomalous extraordinary transmission and provides the necessary framework to design practical high-performance THz components and systems.
文摘Members in the family Herpesviridae share a common architecture:the outer envelope,the inner nucleocapsid and the in-between tegument.There are three types of capsids,A-,B-and C-capsids,which are matured from the procapsid.The procapsid is assembled in the host cell nucleus where the viral dsDNA genome is packaged.The viral genome is driven into the procapsid by the terminase through the portal,which locates at a unique vertex of the icosahedral capsid(Heming et al.,2017).The A-capsid is empty and is believed to be resulted from unsuccessfully packaging of viral genome.B-capsid contains the scaffold similar to that of the procapsid and is likely resulted from failed initiation of viral DNA packaging.
基金supported by Program for Young Innovative Research Team in China University of Political Science and Law(1000‑10814344)Young Research in China University of Political Science and Law(16ZFQ82008).
文摘This manuscript presents a preliminary investigation on the applicability of hyperspectral imaging technology for nondestructive and rapid analysis to reveal covered original handwritings.The hyperspectral imager Nuance‑Macro was used to collect the reflected light signature of inks from the overlapping parts.The software Nuance1p46 was used to analyze the reflected light signature of inks which shows the covered original handwritings.Different types of black/blue ballpoint pen inks and black/blue gel pen inks were chosen for sample preparation.From the hyperspectral images examined,the covered original handwritings of application were revealed in 90.5%,69.1%,49.5%,and 78.6%of the cases.Further,the correlation between the revealing effect and spectral characteristics of the reflected light of inks at the overlapping parts was interpreted through theoretical analysis and experimental verification.The results indicated that when the spectral characteristics of the reflected light of inks at the overlapping parts were the same or very similar to that of the ink that was used to cover the original handwriting,the original handwriting could not be shown.On the contrary,when the spectral characteristics of the reflected light of inks at the overlapping parts were different to that of the ink that was used to cover the original handwriting,the original handwriting was revealed.
文摘Subject Code:H31With the support by the National Natural Science Foundation of China,Ministry of Science and Technology of China and Chinese Academy of Sciences,the research team led by Prof.Geng Meiyu(耿美玉)and Ding Jian(丁健)from Shanghai Institute of Materia Medica,Chinese Academy of Sciences,demonstrated the therapeutic opportunities of histone deacetylases(HDACs)inhibitors in
文摘The US market for women's synthetic trou-sers is characterised by intense competition,with Asian countries playing a dominant role in exports.This analysis delves into the market performance of leading exporters,assessing key indicators such as export values,revealed comparative advantage(RCA).unit value realisation(UVR),and the effect of tariff rates.
文摘Ⅰ.文学常识1. soliloquy - a speech in which an actor, usually alone onstage, utters his or her thought aloud, revealing personal feelings. Hamlet’s 'To be, or not to be' speech is an example.2. foreshadowing - ominous hints of events to come that help to create an air of suspense in a drama.
文摘花粉产量是定量重建古植被、古气候的必要条件,目前花粉产量包括相对花粉产量和绝对花粉产量。由于较难获得多年连续的花粉沉积数据,学者多倾向于使用相对花粉产量进行古植被定量重建。相对花粉产量是某一花粉类型相对于同一参考种的花粉产量的比值(参考种通常选取植物群落和花粉组合中出现频率较高的同一花粉类型),可通过ERV(Extended R-value)模型进行估算,但其准确性受植被调查方法和模型假设条件影响较大。本文介绍了估算相对花粉产量所需的植被调查方法和利用花粉产量定量重建植被景观的模型。目前较成熟的模型为景观重建模型(Landscape Reconstruction Algorithm),包括REVEALS模型(Regional Estimates of Vegetation Abundance from Large Sites,适用于面积≥1~5km^2的沉积盆地植被重建)和LOVE模型(Local Vegetation Estimates,适用于面积为0.1~1.0km^2的沉积盆地植被重建)。欧洲及我国不同区域相对花粉产量和REVEALS模型定量重建研究结果均表明,重建后的古植被景观能较好反映当地的古植被组成。
文摘岗嘎考古遗址是目前呼伦贝尔草原发现的规模最大的一处独木棺群，墓主人身份初步确定为公元8~10世纪的室韦人。这一考古发现为在呼伦贝尔草原探寻蒙古族源提供了最新的考古实证资料。通过对考古遗址文化层和遗址周边广泛分布的黑色砂土进行光释光测年和孢粉分析，利用REVEALS模型（Regional Estimates of Vegetation Abundance from Large Sites）和LOVE模型（Local Vegetation Estimates），重建了该地区在公元2~4世纪、公元7~9世纪、公元11~12世纪和现代共4个时间段的区域和局域植被盖度。结果表明：岗嘎考古遗址的局域植被和区域植被变化比较相似，从公元2~4世纪至现代都以蒿属植物占优势，其植被盖度为27.0%~47.7%。公元2~4世纪，菊科植物在区域和局域都占21.1%~24.8%，但此后其盖度降低，到公元11~12世纪只占3.7%~4.5%；藜科和禾本科植物的盖度从公元7~9世纪以后增加明显。这反映岗嘎地区在公元2~4世纪和公元7~9世纪是以丰富的蒿属和菊科植物组成的草甸草原，公元11~12世纪和现代则是以禾本科、蒿属和藜科为主的典型草原。室韦人生活时期的区域植被为草甸草原，气候比较湿润温和。
