~(266)Bh的α衰变性质研究(英文)

报道了利用兰州重离子研究装置提供的26Mg重离子束流轰击243Am靶产生和鉴别已知超重核素266Bh的实验结果。利用转轮收集探测装置依靠母子核遗传关系通过观测Bh同位素与其子核Db和Lr之间的α-α关联事件来鉴别266Bh。实验中观测到266Bh的α能量为(9.03±0.08)MeV,与日本理化学研究所在合成113号元素中第一个衰变链中观测到266Bh的α能量为9.07 MeV相近。266Bh的半衰期为0.66+-00..5269s,从实验得到的Qα也符合Z=107的Qα随中子数变化的系统性。

Enhancement of (BH)(max) in a hard-soft-ferrite nanocomposite using exchange spring mechanism

We have observed the exchange spring behavior in the soft (Fe3O4)-hard (BaCa2Fe16O27)-ferrite composite by tailoring the particle size of the individual phases and by suitable thermal treatment of the composite. The magnetization curve for the nanocomposite heated at 800 degrees C shows a single loop hysteresis showing the existence of the exchange spring phenomena in the composite and an enhancement of 13% in (BH)(max) compared to the parent hard ferrite (BaCa2Fe16O27). The Henkel plot provides the proof of the presence of the exchange interaction between the soft and hard grains as well as its dominance over the dipolar interaction in the nanocomposite.

Stabilization of an All-Metal Antiaromatic Molecule (Al4Li4) Using BH and C as Caps

It has been reported by Pati et al. (J. Am. Chem. Soc. 2005, 127, 3496) that coordination with a transition metal can stabilize the “antiaromatic”, all-metal compound Al4Li4. Here, we report that it can also be stabilized by capping with a main group element like C and its isoelectronic species BH. Our calculations of binding energy, nuclear independent chemical shift, energy decomposition analysis, and molecular orbital analysis support the capping-induced stability, reduction of bond length alternation, and increase of aromaticity of these BH/C-capped Al4Li4 systems. The interaction between px and py orbitals of BH/C and the HOMO and LUMO of Al4Li4 is responsible for the stabilization. Our calculations suggest that capping can introduce fluxionality at room temperature.

Photodissociation dynamics of CH2ICl at 222, 236, 266, 280, and-304 nm

Dynamics of I*(P-2(1/2)) formation from CH2ICl dissociation has-been investigated at five different ultraviolet excitation wavelengths, e.g., 222, 236, 266, 280, and similar to304 nm. The quantum yield of I*((2)p(1/2)) production, phi*, has been measured by monitoring nascent I(P-2(3/2)) and I* concentrations using a resonance enhanced multiphoton ionization detection scheme. The measured quantum yield as a function of excitation energy follows the same trend as that of methyl iodide except at 236 run. The photodissociation dynamics of CH2ICl also involves three upper states similar to methyl iodide, and a qualitative correlation diagram has been constructed to account for the observed quantum yield. From the difference in behavior at 236 nm, it appears that the crossing region between the two excited states ((3)Q(0) and (1)Q(1)) is located near the exit valley away from the Franck Condon excitation region. The B- and C-band transitions do not participate in the dynamics, and the perturbation of the methyl iodide states due to Cl-I interaction is relatively weak at the photolysis wavelengths employed in this investigation.

Diário da Constituinte [gravação de vídeo] : [programa n. 266]

O Partido Socialista Brasileiro (PSB) encerrou seu congresso em 12 de outubro, votando as diretrizes básicas do partido e lançando seu Manifesto. O Senador Marcelo Miranda (PMDB/MS), relator do manifesto, defende as ideias socialistas. Jamil Haddad, senador e presidente do PSB, informa a adesão de parlamentares ao partido. A Comissão de Sistematização discute os direitos sociais dos trabalhadores: hora extra, licença maternidade e organização sindical. Na próxima semana, a Comissão de Sistematização discutirá a criação de novos estados no Brasil. Atuais regras para criar estados são as seguintes: aprovação pela Assembleia Legislativa Estadual, plebiscito da população e aprovação do Congresso Nacional. O Deputado Arnaldo Moraes (PMDB-PA) declara que é contra a criação do estado de Tapajós. Relata ainda que é preciso um estudo para viabilizar a criação de novos estados. Arcelly de Paula, prefeito de Araxá (MG), recolhe assinaturas para a criação do estado do Triângulo. O Deputado Davi Alves da Silva (PDS-MA) defende a criação do estado do Maranhão do Sul.

Novo rateio dos recursos do fundo de participação dos Estados : impactos da divisão do FPE segundo o PLP 266/2013

Consultoria de Orçamento e Fiscalização Financeira. Núcleo de Assuntos Econômico-Fiscais

Modalidades de desarrollo empresarial. Estudio comparativo de las estrategias de crecimiento en las empresas ORBEA Y BH.

Este trabajo trata de analizar las modalidades de desarrollo que han llevado a cabo las empresas BH y Orbea en el tiempo. La primera parte es un análisis teórico de las diferentes modalidades de desarrollo que existen hoy en día. De este modo, se estudia el desarrollo interno, el crecimiento externo y el conjunto. Para ello, se profundiza con el análisis de las ventajas e inconvenientes que puede tener cada modalidad de crecimiento en las diferentes situaciones concretas. Tras la fundamentación teórica, nos pondremos en situación a través de un análisis pestel del sector y del entorno, para así finalmente pasar al estudio y comparación de las modalidades de desarrollo que han llevado BH y Orbea a lo largo de su historia.

Determination of 266 pesticide residues in apple juice by matrix solid-phase dispersion and gas chromatography-mass selective detection

A macro matrix solid-phase dispersion (MSPD) method was developed to extract 266 pesticides from apple juice samples prior to gas chromatography-mass selective detection (GC-MSD) determination. A 10 g samples was mixed with 20 g diatomaceous earth. The mixture was transferred into a glass column. Pesticide residues were leached with a 160 mL hexane-dichloromethane (1:1) at 5 mL/min. Two hundred and sixty-six pesticides were divided into three groups and detected by GC-MSD under selective ion monitoring. The proposed method takes advantage of both liquid-liquid extraction and conventional MSPD methods. Application was illustrated by the analysis of 236 apple juice samples produced in Shaanxi province China mainland this year. (C) 2004 Elsevier B.V. All rights reserved.

窄条选区外延技术研制AlGaInAs MQW DFB BH 激光器

Submitted by zhangdi (zhangdi@red.semi.ac.cn) on 2009-04-13T11:45:31Z

新核素~(263)Hs,~(260)Bh及其α衰变链上核素的半衰期

运用推广的液滴模型(GLDM)并结合量子力学中的WKB方法计算了新核素~(263)Hs和~(260)Bh及其α衰变链上各核素的势垒贯穿概率,对该链上各原子核的α衰变半衰期进行了研究。计算结果表明:利用推广的液滴模型结合WKB方法计算出的α衰变半衰期可以很好地符合在超重核区的实验值,验证了推广的液滴模型在超重核区的适用性,能够很好地描述超重核的α衰变。同时,计算表明新核素~(260)Bh和~(263)Hs的合成及其半衰期的测量是可靠的。