检索结果-南通市图书馆

Comment on “Approximate and Conditional Teleportation of an Unknown Atomic State Without Bell-State Measurement with Two-Photon Interaction”

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第7期52卷 41-44页

作者： A.D.dSouza W.B.Cardoso A.T.Avelar B.Baseia instituto de Física Universidade Federal de Goiás

In a previous work [Commun. Theor. Phys. 45 （2006） 79] a scheme was presented for approximate and conditional teleportation of an unknown atomic state in a QED-cavity without Bell-state measurement via two-photon Jaynes-Cummings model in the effective Hamiltonian approach. This comment presents an alternative method, based on the so called ＂full two-photon Jaynes-Cummings Hamiltonian approach＂. Accordingly, it describes the evolution of the two-photon degenerate process for arbitrary average photon number inside the cavity, as the correct way to implement teleportation in this scenario.

关键词： teleportation Bell-state measurement cavity QED two-photon interaction

Hole Burning in the Fock Space: from Single to Several Holes

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2001年第11期18卷 1467-1469页

作者： B.Baseia J.M.C.Malbouisson instituto de Fisica Universidade Federal de Goias74001-970GoianiaGOBrazil instituto de Fisica Universidade Federal da Bahia40210-340SalvadorBABrazil

In our previous papers we have studied the production of a single hole in the photon number distribution of a field state [Phys. Lett. A 240 (1998) 277;253 (1999) 123]. In this letter we extend the procedure for the c... 详细信息

关键词： letter creation distribution

ntegrated approach to winery waste： waste generation and data consolidation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2016年第1期10卷 168-176页

作者： Margarida OLIVEIRA Elizabeth DUARTE instituto Superior de Agronomia (ISA) University of Lisbon 1349-017 Lisboa Portugal Escola Superior Agrairia de Santarem (ESAS) Instituto Superior Politecnico de Santarem 2001-904 Santarem Portugal

The winemaking process involves the genera- tion of a significant amount of waste and wastewater. These residues should be addressed for recycling or treatment before being returned to environment. As each winery is unique in waste generation and disposal, plans for environmentally friendly waste management are not universal and should be tested for their effectiveness. In this study, a diagnostic was made during three years, in different wineries, throughout Portugal, in order to quantify and characterize the waste and the wastewater produced. The results showed that solid waste and wastewater are mainly produced during the harvest period, corresponding to 74% and 87%, respectively. One ton of processed grape approximately produce 0.13 t marc, 0.06 t lees, 0.03 t of stalks and 1.65 m3 of wastewater. No significant differences （P≤0.05） were observed for grape marc, lees and wastewater ratios, between years or wineries. With respect to the stalk ratio, there was no effect of year but the winery significantly affected this ratio （P ≤ 0.05）. During the study period the treated wastewater, since diluted, revealed suitable characteristics for irrigation representing an additional source of water. In this regard, the data acquisition and consolidation ensure the transfer of information and experience which constitute an essential step in a support decision tool design.

关键词： waste management wastewater reuse winerywastewater

On the non-evolution of the dependence of black hole masses on bolometric luminosities for QSOs

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2012年第3期12卷 249-259页

作者： Martín López-Corredoira Carlos M. Gutirrez instituto de Astrofísica de Canarias departamento de Astrofísica Universidad de La Laguna

There are extremely luminous quasi stellar objects （QSOs） at high redshift which are absent at low redshift. The lower luminosities at low redshifts can be understood as the external manifestation of either a lower Eddington ratio or a lower mass. To distinguish between both effects, we determine the possible dependence of masses and Eddington ratios of QSOs with a fixed luminosity as a function of redshifts; this avoids the Malmquist bias or any other selection effect. For the masses and Eddington ratios derived for a sample of QSOs in the Sloan Digital Sky Survey, we model their evolution by a double linear fit separating the dependence on redshifts and luminosities. The validity of the fits and possible systematic effects were tested by the use of different estimators of masses or bolometric luminosities, and possible intergalactic extinction effects. The results do not show any significant evolution of black hole masses or Eddington ratios for equal luminosity QSOs. The black hole mass only depends on the bolometric luminosity without significant dependence on the redshift as （M BH/10 9 M ）≈ 3.4 （L bol/10 47 erg s-1）0.65 on average for z ≤ 5. This must not be confused with the possible evolution in the formation of black holes in QSOs. The variations of the environment might influence the formation of the black holes but not their subsequent accretion. It also leaves a question to be solved： Why are there not QSOs with very high mass at low redshift？ A brief discussion of the possible reasons for this is tentatively pointed out.

关键词： accretion—methods: statistical—quasars: general

The neurosphere assay:an effective in vitro technique to study neural stem cells

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2021年第11期16卷 2229-2231页

作者： Rita Soares Filipa F.Ribeiro Diogo M.Lourenço Rui S.Rodrigues João B.Moreira Ana M.Sebastião Vanessa A.Morais Sara Xapelli instituto de Medicina Molecular João Lobo Antunes Faculdade de MedicinaUniversidade de LisboaLisboaPortugal instituto de Farmacologia e Neurociências Faculdade de MedicinaUniversidade de LisboaLisboaPortugal instituto de Biologia Molecular Faculdade de MedicinaUniversidade de LisboaLisboaPortugal

Neural stem cells(NSCs)are known to be present in the adult mammalian brain where they constitutively differentiate into the neuronal,astroglial,and oligodendroglial lineages,in defined processes termed neurogenesis,ast rogl iogenesis and oligodendrogenesis,respectively(reviewed in Braun and Jessberger,2014).During brain development,NSCs are present throughout the brain,becoming progressively restricted to defined brain *** the adult brain,NSCs are mainly present in areas classically known as neurogenic niches,*** subventricular zone(SVZ),along the lateral walls of the lateral ventricles,and the subgranular zone,located in the dentate gyrus(DG)of the hippocampus.

关键词： walls neural becoming

Natural sediment at a dam and its inorganic materials as adsorbents of praseodymium(Pr(Ⅲ))

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 2023年第4期38卷 566-575页

作者： Melania Jiménez-Reyes Jaime Jiménez-Becerril Marcos Solache-Ríos Perla Tatiana Almazán-Sánchez departamento de Química Instituto Nacional de Investigaciones Nucleares Carretera México-Toluca S/N CONACy T-instituto Nacional de Investigaciones Nucleares

The sediment deposited behind a dam(DS) and its inorganic materials(IM-DS) were characterized and used for the removal of praseodymium(Pr) from aqueous solutions. Quartz, albite, and kaolinite were found in the sediment by X-ray diffraction. Kinetic data fit well to a pseudo second-order model, the equilibrium time for DS and IM-DS was 2 h and 3 min, respectively, and the adsorption capacity was higher for Pr/DS(qe= 4.91 mg/g) than for Pr/IM-DS(qe= 3.01 mg/g) in these conditions. Pr/DS and Pr/IM-DS data isotherms were in agreement with the Langmuir-Freundlich model and the maximum adsorption capacities were 4.95 and 4.01 mg/g, respectively. Both processes are exothermic(enthalpy change, ΔH0=-22.8 and-21.8 k J/mol for DS and IM-DS, respectively), the increase of the randomness is small, and the feasibility and spontaneity are low. Praseodymium was desorbed by ethylenediaminetetraacetic acid disodium(EDTA-Na2), sodium chloride, nitric, citric, and humic acids solutions, and one hundred percent of praseodymium was desorbed by the EDTA-Na2solution. The Pr2(EDTA)3(praseodymium ethylenediaminetetraacetate) complex was completely desorbed from both materials(DS and IM-DS). Distribution coefficients(KD) depend upon praseodymium concentration,temperature, p H, and the kind of adsorbent. Chemical reactions of praseodymium with kaolinite and iron minerals could explain the adsorption.

关键词： Praseodymium Sediment Adsorption process parameters desorption

Relations between two types of polarized partitions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 1999年第5期42卷 488-495页

作者：张树果 C.A.DiPrisco department of Mathematics Instituto Venezolano de Investigationes Cientificas

It is shown that close links exist between two important types of polarized partition relations of higher dimensions.

关键词： relation polarized partition relation partition relation.

Condensed Extended Hyper-Wiener Index

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2008年第9期27卷 1134-1140页

作者：李新华 Abraham F.Jalbout 吉智 College of Chemistry and Materials Engineering Wenzhou University instituto de Quimica Universidad Nacional Autonoma de MexicoMexico D.F instituto de fisica Universidad Nacional Autonoma de MexicoMexico D.F

According to the definitions of molecular connectivity and hyper-Wiener index, a novel set of hyper-Wiener indexes （Dn, ^mDn） were defined and named as condensed extended hyper-Wiener index, the potential usefulness of which in QSAR/QSPR is evaluated by its correlation with a number of C3-C8 alkanes as well as by a favorable comparison with models based on molecular connectivity index and overall Wiener index.

关键词： hyper-Wiener index (R) condensed extended hyper-Wiener index molecular connectivity index

Enzymatic and chemo-enzymatic strategies to produce highly valuable chiral amines from biomass with ω-transaminases on 2D zeolites

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第9期9卷 10-18页

作者： J.Miguel Carceller Karen S.Arias Maria J.Climent Sara Iborra Avelino Corma instituto de Tecnologia Química (UPV-CSIC) Universitat Politècnica de València

Amino transaminases(ATAs) have been supported on a 2D ITQ-2 zeolite through electrostatic interactions, resulting in a highly stable active biocatalyst to obtain a variety of valuable chiral amines starting from prochiral ketones derived from biomass. We have extended the biocatalyst applications by designing a chemo-enzymatic process that allows, as the first step, prochiral ketones to be obtained from biomass-derived compounds through an aldol condensation–reduction step using a bifunctional metal/base catalyst. The prochiral ketone is subsequently converted into the chiral amine using the immobilized ATA. We show that it is feasible to couple both steps in a semi-continuous process to produce industrially relevant chiral amines with yields of >95% and ～100% enantiomer excess.

关键词： amino transaminase ITQ-2 zeolite chemo-enzymatic process biomass semi-continuous process Pd/MgO