此前,我们曾到域丰音响位于广州番禺的陈列室中试听了naim最新推出的Uriiti Nova PE多功能一体机搭配Focal的Scala Utopia Evo落地式音箱,这套系统让笔者体验到了Uniti Nova PE的强劲推力,毕竟搭配Scala Utopia Evo属于越级挑战了。文...此前,我们曾到域丰音响位于广州番禺的陈列室中试听了naim最新推出的Uriiti Nova PE多功能一体机搭配Focal的Scala Utopia Evo落地式音箱,这套系统让笔者体验到了Uniti Nova PE的强劲推力,毕竟搭配Scala Utopia Evo属于越级挑战了。文章发布后也有读者朋友留言问到,naim Uniti Nova PE搭配和其价格相仿的Focal Sopra N°2会不会更好?于是我们再次来到域丰音响的试音室,试听这套系统的搭配。展开更多
Novae are found to have GeV to TeVγ-ray emission,which reveals the shock acceleration from the white dwarfs.Recently,V1405 Cas was reported to radiate suspiciousγ-ray by Fermi-LAT with low signi?cance(4.1σ)after th...Novae are found to have GeV to TeVγ-ray emission,which reveals the shock acceleration from the white dwarfs.Recently,V1405 Cas was reported to radiate suspiciousγ-ray by Fermi-LAT with low signi?cance(4.1σ)after the optical maximum.Radio observations reveal that it is one of the?ve brightest novae surrounded by low-density ionized gas columns.Here we report a continuous search for GeVγ-ray from Fermi-LAT.Noγ-ray was found.For V1405 Cas the?ux level is lower than other well-studied Fermi novae,and theγ-ray maximum appears at t0+145 days.γ-ray of V1405 Cas is used to search potentialγ-ray periodicity.Noγ-ray periodicity was found during the time of observation.By comparing multi-wavelength data,theγ-ray upper limit to optical?ux ratio with a value at around 10^(-4)is obtained to constrain the shock acceleration.Long-term analysis from Swift-XRT gets X-ray spectral in the post-shock phase,which indicates that V1405 Cas became a super-soft source.The best-?t black body temperature at the super soft state is 0.11-0.19 keV.展开更多
In this paper,we perform the detailed modeling for the light curves(LCs)of PTF 10iuv which is a calcium-rich(Ca-rich)supernova(SN)to constrain the physical properties of its ejecta and the energy sources,as well as th...In this paper,we perform the detailed modeling for the light curves(LCs)of PTF 10iuv which is a calcium-rich(Ca-rich)supernova(SN)to constrain the physical properties of its ejecta and the energy sources,as well as the explosion mechanism.We find that the^(56)Ni model and the56Ni plus circumstellar interaction model fail to explain the LCs,while the four-element(^(56)Ni,^(48)Cr,^(52)Fe,and^(44)Ti)model can account for the LCs.The ejecta mass of PTF10iuv derived by the model(1.52_(-0.25)^(+0.34)M_(⊙))is consistent with that of the merger of a sub-Chandrasekhar mass white dwarf.The early-time LCs were mainly powered by^(56)Ni whose mass is~0.03 M_(⊙),while the contributions of^(48)Cr and^(52)Fe can be neglected.The derived^(44)Ti mass(~0.25 M_(⊙))is~1.8 times the upper limit of the derived^(44)Ti mass of Ca-rich SN 2005E.We suggest that subtracting the contributions of the host-galaxy,which are unknown,and including the flux from other long-lived elements(e.g.,^(57)Co,^(55)Fe,^(60)Co)can reduce the amount of^(44)Ti,and that this value can be regarded as an upper limit.展开更多
目前电厂烟囱变形监测主要利用传统测量或GPS技术,通过布置监测点达到监测的目的。但传统的监测方法容易受场地、天气、温度及风力等因素的影响,且观测周期较长。为此,进行快速高精度及无接触变形监测成为研究的热点。本文利用Leica Nov...目前电厂烟囱变形监测主要利用传统测量或GPS技术,通过布置监测点达到监测的目的。但传统的监测方法容易受场地、天气、温度及风力等因素的影响,且观测周期较长。为此,进行快速高精度及无接触变形监测成为研究的热点。本文利用Leica Nova MS50全站扫描仪高速点云扫描、高分辨率图像采集及长距离免棱镜测距的功能,进行烟囱倾斜及挠度变化的监测分析。展开更多
Correlation of megafauna extinctions and mega-biosphere disturbances with past supernova explosions has been accomplished by considering a time correction for supernova debris traveling at 88.2325 percent of light spe...Correlation of megafauna extinctions and mega-biosphere disturbances with past supernova explosions has been accomplished by considering a time correction for supernova debris traveling at 88.2325 percent of light speed.Supernova W44 is responsible for the Piora Oscillation which appears to be the biblical event of Noah's Flood.The closest supernova explosion,Vela Jr at 652 light-years,gives the beginning of the greatest historical human disaster,The Black Death.When supernova debris energy input occurs in the northern or southern hemisphere,it causes heating(global warming)in the northern or southern hemisphere,respectively.Long term cooling,the Little Ice Age,occurs in the northern hemisphere when the incoming debris of exploding stars impacts only the southern hemisphere for hundreds of years.Termination of the last ice age results due to melting of numerous supernova impacts that correlate time of impact by changing sea level and geothermal energy released for 2,800 years from the exit crater of Dr.J.Kennet's nano-diamond meteor theory and part of the process involves Dr.O'Keefe's tektite theory.Correlation of Dr Frezzotti's ice melt Antarctica data with supernova impact times over the past 800 years establishes the Global Warming model in conjunction with the November 2016 Antarctic sea ice melt.展开更多
文摘此前,我们曾到域丰音响位于广州番禺的陈列室中试听了naim最新推出的Uriiti Nova PE多功能一体机搭配Focal的Scala Utopia Evo落地式音箱,这套系统让笔者体验到了Uniti Nova PE的强劲推力,毕竟搭配Scala Utopia Evo属于越级挑战了。文章发布后也有读者朋友留言问到,naim Uniti Nova PE搭配和其价格相仿的Focal Sopra N°2会不会更好?于是我们再次来到域丰音响的试音室,试听这套系统的搭配。
基金supported by the National Natural Science Foundation of China(NSFC,grant No.12393853)the Scientific Research Foundation of Hunan Provincial Education Department(21C0343)+1 种基金the Science Research Project of the University(Youth Project)of the Department of Education of Guizhou Province(QJJ[2022]348)the Science and Technology Foundation of Guizhou Province(QKHJC-ZK[2023]442)。
文摘Novae are found to have GeV to TeVγ-ray emission,which reveals the shock acceleration from the white dwarfs.Recently,V1405 Cas was reported to radiate suspiciousγ-ray by Fermi-LAT with low signi?cance(4.1σ)after the optical maximum.Radio observations reveal that it is one of the?ve brightest novae surrounded by low-density ionized gas columns.Here we report a continuous search for GeVγ-ray from Fermi-LAT.Noγ-ray was found.For V1405 Cas the?ux level is lower than other well-studied Fermi novae,and theγ-ray maximum appears at t0+145 days.γ-ray of V1405 Cas is used to search potentialγ-ray periodicity.Noγ-ray periodicity was found during the time of observation.By comparing multi-wavelength data,theγ-ray upper limit to optical?ux ratio with a value at around 10^(-4)is obtained to constrain the shock acceleration.Long-term analysis from Swift-XRT gets X-ray spectral in the post-shock phase,which indicates that V1405 Cas became a super-soft source.The best-?t black body temperature at the super soft state is 0.11-0.19 keV.
基金supported by National Natural Science Foundation of China(NSFC,grant Nos.11963001,12133003,11833003,11973020(C0035736),and U1938201)supported by the Guangxi Talent Program(“Highland of Innovation Talents”)。
文摘In this paper,we perform the detailed modeling for the light curves(LCs)of PTF 10iuv which is a calcium-rich(Ca-rich)supernova(SN)to constrain the physical properties of its ejecta and the energy sources,as well as the explosion mechanism.We find that the^(56)Ni model and the56Ni plus circumstellar interaction model fail to explain the LCs,while the four-element(^(56)Ni,^(48)Cr,^(52)Fe,and^(44)Ti)model can account for the LCs.The ejecta mass of PTF10iuv derived by the model(1.52_(-0.25)^(+0.34)M_(⊙))is consistent with that of the merger of a sub-Chandrasekhar mass white dwarf.The early-time LCs were mainly powered by^(56)Ni whose mass is~0.03 M_(⊙),while the contributions of^(48)Cr and^(52)Fe can be neglected.The derived^(44)Ti mass(~0.25 M_(⊙))is~1.8 times the upper limit of the derived^(44)Ti mass of Ca-rich SN 2005E.We suggest that subtracting the contributions of the host-galaxy,which are unknown,and including the flux from other long-lived elements(e.g.,^(57)Co,^(55)Fe,^(60)Co)can reduce the amount of^(44)Ti,and that this value can be regarded as an upper limit.
文摘目前电厂烟囱变形监测主要利用传统测量或GPS技术,通过布置监测点达到监测的目的。但传统的监测方法容易受场地、天气、温度及风力等因素的影响,且观测周期较长。为此,进行快速高精度及无接触变形监测成为研究的热点。本文利用Leica Nova MS50全站扫描仪高速点云扫描、高分辨率图像采集及长距离免棱镜测距的功能,进行烟囱倾斜及挠度变化的监测分析。
文摘Correlation of megafauna extinctions and mega-biosphere disturbances with past supernova explosions has been accomplished by considering a time correction for supernova debris traveling at 88.2325 percent of light speed.Supernova W44 is responsible for the Piora Oscillation which appears to be the biblical event of Noah's Flood.The closest supernova explosion,Vela Jr at 652 light-years,gives the beginning of the greatest historical human disaster,The Black Death.When supernova debris energy input occurs in the northern or southern hemisphere,it causes heating(global warming)in the northern or southern hemisphere,respectively.Long term cooling,the Little Ice Age,occurs in the northern hemisphere when the incoming debris of exploding stars impacts only the southern hemisphere for hundreds of years.Termination of the last ice age results due to melting of numerous supernova impacts that correlate time of impact by changing sea level and geothermal energy released for 2,800 years from the exit crater of Dr.J.Kennet's nano-diamond meteor theory and part of the process involves Dr.O'Keefe's tektite theory.Correlation of Dr Frezzotti's ice melt Antarctica data with supernova impact times over the past 800 years establishes the Global Warming model in conjunction with the November 2016 Antarctic sea ice melt.
