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Molecular and compact four-quark states

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Chinese Physics C 2010年第9期34卷 1290-1293页

作者： a.valcarce J.Vijande Departamento de Física Fundamental Universidad de Salamanca Departamento de Física Atómica Molecular y NuclearUniversidad de Valencia (UV) and IFIC (UV-CSIC)

We study charmonium （ccnn）,bottomonium （b bnn） and exotic （ccnn and bbnn） four-quark states by means of a standard non-relativistic quark potential *** look for possible bound *** them we are able to distinguish... 详细信息

关键词： tetraquarks quark-models charmonium exotics

Ξ^-t quasibound state instead of ΛΛnn bound state

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Chinese Physics C 2020年第2期44卷 94-100页

作者： H.Garcilazo a.valcarce J.Vijande Escuela Superior de Física y Matemáticas Instituto Politécnico NacionalEdificio 907738 México D.F.Mexico Departamento de Física Fundamental Universidad de Salamanca37008 SalamancaSpain Departamento de Física Atómica Molecular y NuclearUniversidad de Valencia(UV)and IFIC(UV-CSIC)46100 ValenciaSpain IRIMED Joint Research Unit(IIS La Fe-UV) 46100 ValenciaSpain

The coupledΛΛnn-Ξ-pnn system was studied to investigate whether the inclusion of channel coupling is able to bind theΛΛnn *** use a separable potential three-body model of the coupledΛΛnn-Ξ-pnn system and a variational four-body calculation with realistic *** results exclude the possibility of aΛΛnn bound state by a large ***,we found aΞ-t quasibound state above theΛΛnn threshold.

关键词： baryon-baryon interactions few-body systems Faddeev equations

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The _(ΛΛ)~4n system

Chinese Physics C 2017年第7期41卷 61-66页

作者： H.Garcilazo a.valcarce J.Vijande Escuela Superior de Ffsica y Matematicas Instituto Politecnico Nacional Edificio 9 07738 Mexico D.F. Mexico Departamento de Ffsica Fundamental and IUFFyM Universidad de Salamanca E-37008 Salamanca Spain Unidad Mixta de Investigacion en Radioffsica e Instrumentacion Nuclear en Medicina (IRIMED) Instituto de Investigacion Sanitaria La Fe (IIS-La Fe)-Universitat de Valencia (UV) and IFIC (UV-CSIC) Valencia Spain

Using local central Yukawa-type Malfliet-Tjon interactions reproducing the low-energy parameters and phase shifts of the nn system, and the latest updates of the nΛ and ΛΛ Nijmegen ESC08c potentials, we study the possible existence of a ^4 ΛΛn bound state. Our results indicate that the ^4 ΛΛn is unbound, being just above *** discuss the role played by the -1S0 nn repulsive term of the Yukawa-type Malfliet-Tjon interaction.

关键词： baryon-baryon interactions few-body systems

Biogas Production from Various Typical Organic Wastes Generated in the Region of Cantabria (Spain): Methane Yields and Co-Digestion Tests

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Smart Grid and Renewable Energy 2014年第6期5卷 128-136页

作者： Carlos Rico Rubén Diego Agustín valcarce José Luis Rico Department of Chemical and Process Engineering Resources University of Cantabria Santander Spain Department of Water and Environment Science and Technologies University of Cantabria Santander Spain Teican Medioambiental Boo de Piélagos Cantabria Spain

Batch trials were carried out to determine the methane potential yields of some typical organic wastes generated in the region of Cantabria (Spain): cocoa shell, cheese whey and sludges from dairy industry. Anaerobic co-digestion trials of these wastes with dairy manure were also investigated in batch at 35℃. Cheese whey obtained similar methane yields than dairy manure, between 17.5 and 19.3 L CH4kg-1 cheese whey compared with 18.0 L CH4kg-1 manure. Methane yields of various sludge samples collected from wastewater treatment facilities of dairy industries were influenced by its origin. Sludge samples from fat separation devices were the most productive in terms of specific methane yields compared with biological sludge from an aerobic reactor. Sludge samples from fat separator reached specific methane productivities of 350 and 388 L CH4kg-1 VS (10.5 and 24.1 L CH4kg-1 sludge), whereas biological sludge yielded 125 L CH4kg-1 VS (12.6 L CH4kg-1 sludge). The methane potential of sludge samples was influenced by solids content. Cocoa shell resulted to be an interesting waste for anaerobic digestion due to its high VS content, yielding 195 L CH4kg-1 cocoa shell. It is a waste that can considerably improve methane yields in anaerobic co-digestion with dairy manure. However, at proportions of 10% cocoa shell, the process was hindered by hydrolysis of particulate matter. Anaerobic digestion at higher temperatures (thermophilic range) could be a better option for this kind of waste. Co-digestion of 5% cocoa shell with 35% dairy sludge and 60% dairy manure resulted in 80.5% higher methane production compared to anaerobic digestion of dairy manure alone.

关键词： Cheese Whey Co-Digestion Cocoa Shell Dairy Sludge Manure