排序方式: 共有74条查询结果,搜索用时 27 毫秒
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A flow gas low-pressure multi-wire proportional chamber(LPMWPC)with an active area of 180 mm×80 mm has been developed for the flying time test of the recoil nuclei on super heavy nuclear experiments.The LPMWPC detector can be operated in single as well as double step operational modes.In the case of double step operational mode with a high gas amplification factor,signals fromα-particles reside well above the electronic noise.The gas leakage rate and time resolution obtained from theα239Pu source are shown and discussed at the condition of 3 mbar Isobutane gas.It was shown that the time resolution was better than 2.9 ns at the best work condition,and the detecting efciency was larger than 98%at the low energyαparticles.So the LPMWPC is fit to measure the flying time in the super heavy nuclear fragments experiment. 相似文献
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采用缓慢挥发溶剂的方法合成了硫原子桥联芳基取代四硫富瓦烯(Ar-S-TTF)与碘的3种电荷转移复合物(1+·)(I3)·I2、(2+·)(I5)·I2和(32+)(I3)2,采用单晶X射线衍射、紫外可见光谱、循环伏安对其进行了表征。复合物(1+·)(I3)·I2为C2/c空间群,1+·呈椅式构型。化合物1与碘之间在溶液中和复合物中电荷转移一致。复合物(2+·)(I5)·I2为P1空间群,2+·呈椅式构型。复合物(32+)(I3)2为Pbca空间群,32+呈独特的平面构型。化合物2和3与碘之间在溶液中和复合物中呈现不同的电荷转移。复合物中聚碘阴离子呈现不同的堆积结构:由I3-或I5-/I2组成的一维链状和I3-/I2组成的二维网格状。 相似文献
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求方阵的特征根与各级根向量的一种方法殷子和,马龙友(武汉工业大学北京研究生部)(北京建筑工程学院)本文首先提出初等相似变换的概念,然后利用这一概念在若当标准形存在定理的基础上导出求方阵的若当标准形,演化矩阵及其逆,特征根和各级根向量的方法。定义对方阵... 相似文献
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利用能量为170MeV的35Cl束流,通过157Gd(35Cl,4n)熔合蒸发反应研究了188Tl的高自旋态能级结构.依据实验结果建立了188Tl基于πh9/2(?)vi13/2组态的转动带.根据双奇Tl核能级结构的相似性,指定了188Tlπh9/2(?)vi13/2扁椭球转动带的自旋值.结果表明在188Tl中,πh9/2(?)vi13/2扁椭球转动带在低自旋区具有旋称反转性质.利用包含了质子-中子剩余相互作用的准粒子-转子模型,定性地解释了πh9/2(?)vi13/2扁椭球转动带的低自旋区旋称反转现象. 相似文献
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采用缓慢挥发溶剂的方法合成了硫原子桥联芳基取代四硫富瓦烯(Ar-S-TTF)与碘的3种电荷转移复合物(1+·)(I3)·I2、(2+·)(I5)·I2和(32+)(I3)2,采用单晶X射线衍射、紫外可见光谱、循环伏安对其进行了表征。复合物(1+·)(I3)·I2为C2/c空间群,1+·呈椅式构型。化合物1与碘之间在溶液中和复合物中电荷转移一致。复合物(2+·)(I5)·I2为P1空间群,2+·呈椅式构型。复合物(32+)(I3)2为Pbca空间群,32+呈独特的平面构型。化合物2和3与碘之间在溶液中和复合物中呈现不同的电荷转移。复合物中聚碘阴离子呈现不同的堆积结构:由I3-或I5-/I2组成的一维链状和I3-/I2组成的二维网格状。 相似文献
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Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks 下载免费PDF全文
We theoretically study the near-field couplings of two stacked all-dielectric nanodisks, where each disk has an electric anapole mode consisting of an electric dipole mode and an electric toroidal dipole (ETD) mode. Strong bonding and anti-bonding hybridizations of the ETD modes of the two disks occur. The bonding hybridized ETD can interfere with the dimer's electric dipole mode and induce a new electric anapole mode. The anti-bonding hybridization of the ETD modes can induce a magnetic toroidal dipole (MTD) response in the disk dimer. The MTD and magnetic dipole resonances of the dimer form a magnetic anapole mode. Thus, two dips associated with the hybridized modes appear on the scattering spectrum of the dimer. Furthermore, the MTD mode is also accompanied by an electric toroidal quadrupole mode. The hybridizations of the ETD and the induced higher-order modes can be adjusted by varying the geometries of the disks. The strong anapole mode couplings and the corresponding rich higher-order mode responses in simple all-dielectric nanostructures can provide new opportunities for nanoscale optical manipulations. 相似文献
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广义柯西中值定理的“中间点”的渐近性殷子和,马龙友(武汉工业大学北京研究生部)(北京建筑工程学院)文[1]、[2]对柯西中值定理的“中间点ξ”的渐近性问题进行了研究.本文给出广义柯西中值定理的“中间点ξ”的渐近性定理,并予以证明.柯西中值定理的一种推... 相似文献
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张玉虎 周小红 何建军 刘忠 方永得 郭文涛 雷祥国 郭应祥 马龙 M.Moyo Ndontchueng M.Oshima Y.Toh M.Koizumi A.Osa A.Kimura Y. 《中国物理 C》2006,30(Z2):208-210
为了搜寻182Au, 184Au,186Au核中πi13/2⊙νi13/2转动带的旋称反转, 我们通过152Sm(35Cl,5n)182Au,171Yb(19F,4n)186Au和159Tb(29Si,4n)184Au反应对182Au,184Au, 186Au核进行了在束γ谱学研究. 本工作扩展了这3个核πi13/2⊙νi13/2带的能级纲图, 特别是确定了184Au核πi13/2⊙νi13/2带的能级自旋宇称, 发现了低自旋旋称反转现象. 相似文献
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