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Characterization of Cd1-xZnxTe（0≤x≤1） Nanolayers Grown by Atomic Layer Deposition on GaSb and GaAs（001） Oriented Substrates

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Journal of Electronic Science and Technology 2019年第2期17卷 97-108页

作者： Joel Díaz-Reyes Roberto Saúl Castillo-Ojeda josé Eladio flores-Mena Center for Research in Applied Biotechnology Instituto Politécnico Nacional Tepetitla 90700 Mexico Universidad Politécnica de Pachuca Pachuca 43830 Mexico Faculty of Sciences of the Electronics Autonomous University of Puebla Puebla 72570 Mexico

ZnTe, CdTe, and the ternary alloy CdZnTe are important semiconductor materials used widely for the detection of an important range of electromagnetic radiation as gamma ray and X-ray. Although, recently these materials have acquired renewed importance due to the new explored nanolayer properties of modern devices. In addition, as shown in this work they can be grown using uncomplicated synthesis techniques based on the deposition in vapour phase of the elemental precursors. This work presents the results obtained from the deposition of nanolayers of these materials using the precursor vapour on GaAs and GaSb (001) substrates. This growth technique, extensively known as atomic layer deposition (ALD), allows the layers growth with nanometric dimension. The main results presented in this work are the used growth parameters and the results of the structural characterization of the layers by the means of Raman spectroscopy measurements. Raman scattering shows the peak corresponding to longitudinal optical (LO)-ZnTe, which is weak and slightly redshift in comparison with that reported for the ZnTe bulk at 210 cm^-1. For the case of the CdTe nanolayer, Raman spectra presented the LO-CdTe peak, which is indicative of the successful growth of the layer. Its weak and slightly redshift in comparison with that reported for the CdTe bulk can be related with the nanometric characteristic of this layer. The performed high-resolution X-ray diffraction (HR-XRD) measurement allows to study some important characteristics such as the crystallinity of the grown layer. In addition, the HR-XRD measurement suggests that the crystalline quality has dependence on the growth temperature.

关键词： Ⅲ-Ⅴ substrates atomic layer deposition(ALD) defect generation mechanism ternary alloy Cd1-xZnxTe Zn and Cd mixture

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建筑实践 2024年第4期 40-43页

作者： Patrik Schumacher 桥谕 Paulo flores 扎哈·哈迪德建筑事务所

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Forecast of the Luminescent Phenomena of Silicon Rich Oxide Films off Stoichiometry by Means of the Global Reaction Model

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Journal of Modern Physics 2015年第11期6卷 1679-1694页

作者： Néstor David Espinosa-Torres josé álvaro David hernández de la Luz josé Francisco Javier flores-Gracia josé Alberto Luna-López Javier Martínez-Juárez Gregorio flores-Carrasco IC-CIDS Benemérita Universidad Autónoma de Puebla Puebla México Ex Graduate Research Trainee at Plasma Processing Laboratory Chemical Engineering Department McGill University Montreal Canada Department of Materials Science and Engineering and Chemical Engineering University Carlos III of Madrid and IAAB Madrid Spain

The Global Reaction Model describes a set of chemical reactions that can potentially occur during the process of obtaining silicon rich oxide (SRO) films, regardless of the technique used to grow such films which are an outside stoichiometry material. Particularly, chemical reactions that occur during the process of growing of SRO films by LPCVD technique are highlighted in this model. We suggest and evaluate either some types of molecules or resulting nanostructures and we predict theoretically, by applying the density functional theory, the contribution that they may have to the phenomenon of luminescence which is measured in SRO films. Also, we have calculated the opto-electronic properties of SRO films. The suggested model provides enough information required to identify the molecular structures resulting from the presence of defects in SRO films and also those corresponding to charged structures. It is also possible to detect the molecular structures which are modified due to the effect of heat treatment, and identify the presence of different oxidation states inclusive the formation of siloxanes.

关键词： Global Reactions Model Silicon Rich-Oxide Defects LPCVD Luminescence

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Facilitation by nurse plants contributes to vegetation recovery in human-disturbed desert ecosystems

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Journal of Plant Ecology 2016年第5期9卷 485-497页

作者： Ernesto I.Badano Omar R.Samour-Nieva Joel flores joséL.flores-flores Jorge A.flores-Cano Juan P.Rodas-Ortíz División de Ciencias Ambientales Instituto Potosino de Investigación Científica y TecnológicaA.C.Camino a la Presa San José2055Colonia Lomas 4ta SecciónC.P.78216San Luis PotosíMéxico Instituto de Investigación de Zonas Desérticas Universidad Autónoma de San Luis PotosíAltair 200Fraccionamiento del LlanoC.P.78377San Luis PotosíMéxico Facultad de Agronomía Universidad Autónoma de San Luis PotosíKm.14.5 Carretera San Luis-MatehualaApdo.Postal 32Soledad de Graciano SánchezC.P.78321San Luis PotosíMéxico

Aims Facilitation by nurse plants is a common interaction in harsh environments and this positive plant-plant interaction may promote vegetation recovery in ecosystems affected by human *** the relevance of this process,however,requires assessing how nurse plants influence the establishment of other species,as well as the proportion of species in the regional species pool that would benefit from the presence of nurse plants in human-disturbed ***,since vegetation recovery is a time-dependent process,the community-level consequences of facilitation are likely to vary among landscapes with different disturbance ***,an integrative perspective of the relevance of nurse plants for vegetation recovery could be obtained by measuring their effects across different human-disturbed landscapes of the target *** study focuses on these issues and uses a regional-scale approach to assess the community-level effects of a widespread nurse plant of American deserts,the creosotebush(Larrea tridentata).Methods This study was conducted in the southernmost portion of Chihuahuan Desert because most floodplain valleys of this region have been affected by human activities during the past *** this study,we selected 10 floodplain valleys differing in their age(*** time elapsed after human activities were ceased).At each landscape,we measured the cover of creosotebushes and the proportion of plant species positively associated with them,as well as the density of seeds in the soil beneath creosotebush *** these data were regressed against the age of the ***,to assess whether positive association patterns were due to facilitation or other processes,we conducted field experiments and measured the ecophysiological performance of plant species established beneath and outside creosotebush *** Findings Most plant species from the target region were positively associated to creosotebushes,and our field

关键词： Chihuahuan desert community-level effects community succession positive interactions Mexico

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Impact of HIV on the health-related quality of life in youth with perinatally acquired HIV

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World Journal of Pediatrics 2019年第5期15卷 492-498页

作者： Isabel Cuéllar-flores Talís Saínz Carlos Velo María Isabel González-Tomé Cristina García-Navarro Caroclina Fernández-Mcphee Sara Guillén joséTomás Ramos Pilar Miralles Rafae Rubio joséIgnacio Bernardino luis Prieto Pablo Rojo Santiago Jiménez de Ory Maria luisa Navarro CoRiSpe(FARO and NeuroCoRISpeS projects,RITIP-Traslational Research Network in Pediatric Infectious Diseases) Pediatric Department Hospital Clínico San CarlosMadridSpain Infectious Diseases Service Paed DepartmentHospital La PazMadridSpain La Paz Research Institute(IdiPAZ) MadridSpain Infectious Diseases Service Paed DepartmentHospital 12 de OctubreMadridSpain Infectious Diseases Service Paed DepartmentH.Gregorio MaranónMadridSpain Paed Department Hospital de GetafeMadridSpain Infectious Diseases Service H.Gregorio MaranónMadridSpain HIV Service Hospital 12 de OctubreMadridSpain Infectious Diseases Service Hospital La PazMadridSpain Instituto de Investigación Sanitaria Hospital Gregorio Maranón(IiSGM) MadridSpain Universidad Complutense de Madrid MadridSpain Translational Research Network in Pediatric Infectious Diseases(RITIP) MadridSpain 不详

Background Studies investigating health-related quality of life(HRQoL)in youth with perinatally acquired HIV(PHIV+)are *** study aimed to compare HRQoL of PHIV+to sociodemographic-matched youth not living with HIV(HIV-),Spanish general youth population,and to explore associations between sociodemographic variables,drug consumption,and *** PHIV+youth were randomly selected from CoRISpe database(Cohort of the Spanish Pediatric HIV Network).HRQoL was evaluated by *** Thirty-nine PHIV+youth(mean age:23.36 years,SD=3.83)and thirty-nine HIV-youth(mean age:22.97 years,SD=3.80)participated in this ***+obtained lower scores in SF-12 physical health subscale(PCS)than HIV-(P=0.001)and Spanish general youth population(P=0.006).PHIV+had lower scores on the mental health subscale(MCS)than the Spanish general youth population(P<0.001).PHIV+who were at school obtained better scores than those were not at ***+youth who had used cocaine and cannabis had lower scores in MCS(P=0.002).Conclusions There is a need for HRQoL management in the associated medical follow-up.

关键词： Drug consumption Health-related quality of life Mental health Perinatally acquired HIV youth

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C19MC miRNA-520G induces SP100 antiviral gene transcription and inhibits melanin production in skin cutaneous melanoma

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Genes & Diseases 2024年第1期11卷 60-63页

作者： Goodwin G.Jinesh Marian T.Smallin Nino Mtchedlidze Isha Godwin Marco Napoli Nicole Hackel Manali S.Phadke Avani A.Deshpande Xiaobo Li John H.Lockhart Jaden R.Baldwin Suehelay Acevedo-Acevedo Yifeng Gao Michelle A.Reiser Keiran S.M.Smalley Elsa R.flores Andrew S.Brohl Department of Molecular Oncology H.Lee Moffitt Cancer Center&Research InstituteTampaFL 33612USA Molecular Medicine Program H.Lee Moffitt Cancer Center&Research InstituteTampaFL 33612USA Saveetha Medical College ChennaiTamil Nadu 602105India Tumor Biology Department H.Lee Moffitt Cancer Center&Research InstituteTampaFL 33612USA Sarcoma Department H.Lee Moffitt Cancer Center&Research InstituteTampaFL 33612USA

SP100 is an antiviral protein that restricts the productive stage of human papillomavirus(HPV)and multiple other viruses,and viruses in turn block sUMO-1-mediated stabilization of SP100 and promotes its degradation(Table S1).Interferon(IFN)signaling could still produce more SP100 through transcription to counteract viruses.1 Viruses also disable the transcriptional up-regulation of SP100 to achieve persistent infection in hosts.

关键词： SP100 melanoma stabilization

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<i>Ab Initio</i>Molecular Orbital Calculation for Optical and Electronic Properties Evaluation of Small and Medium Size Silicon Nano-Clusters Found in Silicon Rich Oxide Films

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Journal of Modern Physics 2013年第11期4卷 1-26页

作者： Néstor David Espinosa Torres josé Francisco Javier flores Gracia josé Alberto Luna López Juan Carlos Ramírez García Alfredo Morales Sánchez josé luis Sosa Sánchez David hernández de la Luz Francisco Morales Morales Research Center for Advanced Materials S.C. Unit Monterrey-PIIT Apodaca México Research Center for Semiconductor Devices CIDS-ICUAP-BUAP Puebla México The Faculty of Chemical Sciences BUAP Puebla México

In systems in atomic and nano scales such as clusters or agglomerates constituted of particles from a few to less than one hundred of atoms, quantum confinement effects are very important. Their optical and electronic properties are often dependent on the size of the systems and the way in which the atoms in these clusters are bonded. Generally, these nano-structures display optical and electronic properties significantly different of those found in corresponding bulk materials. Silicon agglomerates found in Silicon Rich Oxide (SRO) films have optical properties, which have reported as depended directly on nano-crystal size. Furthermore, the room temperature photoluminescence (PL) of Silicon Rich Oxides (SRO) has repeatedly generated a huge interest due to their possible applications in optoelectronic devices. However, a plausible emission mechanism has not yet widespread acceptance of the scientific community. In this research, we employed the Density Functional Theory with a functional B3LYP and a basis set 6 - 31G* to calculate the optical and electronic properties of small (six to ten silicon atoms) and medium size clusters of silicon (constituted of eleven to fourteen silicon atoms). With the theoretical calculation of the structural and optical properties of silicon clusters, it is possible to evaluate the contribution of silicon agglomerates in the luminescent emission mechanism experimentally found in thin SRO films.

关键词： Nano-Crystals Silicon Clusters Silicon-Rich Oxide Luminescence Magic-Number

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Solvent- and Catalyst-Free Microwave-Assisted Decarboxylation of Malonic Acid Derivatives

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Green and Sustainable Chemistry 2017年第4期7卷 270-280页

作者： Fanny Araceli Cabrera-Rivera luis Gabriel hernández-Vázquez Patricia flores-Sánchez Maria Durán-Galván Jaime Escalante The Center of Chemical Research UAEM Cuernavaca México SIGNA Civac S. A. de C. V. Jiutepec México

It has been found that microwave assisted decarboxylation of malonic acid derivatives can be achieved under solvent-free and catalyst free conditions. This new method produces the corresponding carboxylic acid in a pure manner and with a high yield in a very short reaction time: 3 - 10 min. In general terms, the condition under which this reaction is carried out accelerates the decarboxylation significantly of a series of disubstituted malonic acid derivatives, and makes this new process efficient, easy and environmentally friendly.

关键词： Microwave Decarboxylation Malonic Acid Derivatives Solvent-Free Catalyst-Free Green Chemistry

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A New Perspective of the Force on a Magnetizable Rod inside a Solenoid

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Journal of Electromagnetic Analysis and Applications 2018年第10期10卷 171-183页

作者： josé-luis Jiménez-Ramírez Ignacio Campos-flores josé-Antonio-Eduardo Roa-Neri Departamento de Física Facultad de Ciencias Universidad Nacional Autónoma de México México D. F. México área de Física Teórica y Materia Condensada División de Ciencias Básicas e Ingeniería Universidad Autónoma Metropolitana Unidad Azcapotzalco México D. F. México

We analyze the familiar effect of the pulling of a magnetizable rod by a magnetic field inside a solenoid. We find that the analogy with the pulling of a dielectric slab by a charged capacitor is not as direct as usually thought. Indeed, there are two possibilities to pursue the analogy, according to the correspondence used,?either E → B and D → H, or E?→ H and D?→ B. One of these results in an incorrect sign in the force, while the other gives the correct result. We avoid this ambiguity in the usual energy method applying a momentum balance equation derived from Maxwell’s equations. This method permits the calculation of the force with a volume integration of a force density, or with a surface integration of a stress tensor. An interpretation of our results establishes that the force acts at the interface and has its origin in Maxwell′s magnetic stresses at the medium-vacuum interface. This approach provides new insights and a new perspective of the origin of this force.

关键词： Force on a Rod in a Solenoid Magnetostatic Force Maxwell Momentum Balance Equation

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How Does Arise the Force on a Dielectric Slab in a Parallel Plate Capacitor?

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Journal of Electromagnetic Analysis and Applications 2018年第7期10卷 131-142页

作者： Ignacio Campos-flores josé-luis Jiménez-Ramírez josé-Antonio-Eduardo Roa-Neri Departamento de Física Facultad de Ciencias Universidad Nacional Autónoma de México Mexico City Mexico rea de Física Teórica y Materia Condensada División de Ciencias Básicas e Ingeniería Universidad Autónoma Metropolitana Unidad Azcapotzalco Mexico City Mexico

We address the problem of the force exerted on a dielectric slab partially introduced into a charged parallel plate capacitor. This elementary problem is usually solved calculating this force as the gradient of an energy and attributing its origin to the action of the fringing field outside the capacitor on the dipoles of the dielectric slab. By applying Maxwell’s theory of electromagnetic stresses, we show that this force acts at the interface dielectric-vacuum and originates from the action of these stresses. This approach permits to obtain the force as a volume integration of a force density, or as a surface integral of a stress tensor. This force density and the stress tensor are part of a momentum balance equation derived from Maxwell’s equations.

关键词： Classical Electromagnetism Maxwell Equations Electrostatics Maxwell Balance Equation Maxwell Stress Tensor

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