Large-aperture solar telescopes play an important role in solar observations and research,and require high temporal and spatial resolution[1].To solve some fundamental problems such as the solar dynamo,coronal heating...Large-aperture solar telescopes play an important role in solar observations and research,and require high temporal and spatial resolution[1].To solve some fundamental problems such as the solar dynamo,coronal heating,and the triggering of major solar eruptions,the spatial resolution for solar-atmosphere observation should reach at least 0.1 arcsec[2].展开更多
The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 3...The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs factory.In its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs bosons.Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of magnitude.This Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering aspects.Additionally,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection procedures.Construction is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 years.The commencement of experiments and data collection could potentially be initiated in the mid-2030s.展开更多
本研究对穿心莲叶绿体基因组密码子使用偏性进行了分析,并探究造成密码子偏好性的主要影响因素。利用软件R Studio、Excel 2019和在线软件CUSP、Codon W 1.4.2等对筛选出的53个蛋白编码区进行计算分析,得到了53个编码蛋白质的基因序列(c...本研究对穿心莲叶绿体基因组密码子使用偏性进行了分析,并探究造成密码子偏好性的主要影响因素。利用软件R Studio、Excel 2019和在线软件CUSP、Codon W 1.4.2等对筛选出的53个蛋白编码区进行计算分析,得到了53个编码蛋白质的基因序列(coding DNA sequence,CDS)的碱基组成和有效密码子数(effective number of codon,ENC),以及通过相对同义密码子使用度(relative synonymous codon usage,RSCU)分析确定了最优密码子。结果表明,穿心莲GC_(all)平均含量为38.52%,其中第1、2位碱基的GC含量均远高于第3位碱基;ENC值的平均值为48.024,且ENC值大于45的占75.47%,穿心莲偏性较弱;通过ENC-plot绘图分析、PR2-plot绘图分析以及中性绘图分析确定了密码子偏好性在主要受到选择的影响的同时还受到突变因素影响;共确定了UUU、UUA、CUU等18个最优密码子,均为A/U结尾。该研究为完善穿心莲叶绿体基因组学、植物鉴定等方面提供数据参考。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.11727805)the Youth Innovation Promotion Association,Chinese Academy of Sciences(Grant No.2018412)。
文摘Large-aperture solar telescopes play an important role in solar observations and research,and require high temporal and spatial resolution[1].To solve some fundamental problems such as the solar dynamo,coronal heating,and the triggering of major solar eruptions,the spatial resolution for solar-atmosphere observation should reach at least 0.1 arcsec[2].
基金support from diverse funding sources,including the National Key Program for S&T Research and Development of the Ministry of Science and Technology(MOST),Yifang Wang's Science Studio of the Ten Thousand Talents Project,the CAS Key Foreign Cooperation Grant,the National Natural Science Foundation of China(NSFC)Beijing Municipal Science&Technology Commission,the CAS Focused Science Grant,the IHEP Innovation Grant,the CAS Lead Special Training Programthe CAS Center for Excellence in Particle Physics,the CAS International Partnership Program,and the CAS/SAFEA International Partnership Program for Creative Research Teams.
文摘The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by China,fostered through extensive collaboration with international partners.The complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs factory.In its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs bosons.Increasing the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of magnitude.This Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil engineering aspects.Additionally,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming engineering design phase and site selection procedures.Construction is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 years.The commencement of experiments and data collection could potentially be initiated in the mid-2030s.
文摘本研究对穿心莲叶绿体基因组密码子使用偏性进行了分析,并探究造成密码子偏好性的主要影响因素。利用软件R Studio、Excel 2019和在线软件CUSP、Codon W 1.4.2等对筛选出的53个蛋白编码区进行计算分析,得到了53个编码蛋白质的基因序列(coding DNA sequence,CDS)的碱基组成和有效密码子数(effective number of codon,ENC),以及通过相对同义密码子使用度(relative synonymous codon usage,RSCU)分析确定了最优密码子。结果表明,穿心莲GC_(all)平均含量为38.52%,其中第1、2位碱基的GC含量均远高于第3位碱基;ENC值的平均值为48.024,且ENC值大于45的占75.47%,穿心莲偏性较弱;通过ENC-plot绘图分析、PR2-plot绘图分析以及中性绘图分析确定了密码子偏好性在主要受到选择的影响的同时还受到突变因素影响;共确定了UUU、UUA、CUU等18个最优密码子,均为A/U结尾。该研究为完善穿心莲叶绿体基因组学、植物鉴定等方面提供数据参考。
