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Differences of Wood Elements of Prosopis laevigata from Two Areas of Northeast Mexico

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American Journal of Plant Sciences 2013年第5期4卷 56-60页

作者： Artemio Carrillo-Parra Rahim Foroughbakhch-Pournavab Verónica Bustamante-García Sadoth Sandoval-torres Fortunato Garza-Ocanas sergio Moreno-Limón Facultad de Ciencias Forestales Universidad Untónoma de Nuevo LeónLinaresMéxico Facultad de Ciencias Biológicas Uni-versidad Uutónoma de Nuevo LeónSan Nicolás de los GarzaMéxico Instituto de Silvicultura e Industria de la Madera Universi-dad Juárez del Estado de DurangoDurangoMéxico Centro Interdisciplinario de Investigación para el Desarrollo Integral Regional Instituto Politécnico NacionalOaxaca de JuárezMéxico

Anatomical features of wood have a great variation among species as a result of genetic and environmental factors. The anatomical heartwood characteristics of Prosopis laevigata species from two areas with differences on temperature and rain precipitation on northeast Mexico were compared. Fibers length (μm), diameter of vessels (μm), and the area of the vessels (μm-2) were measured using light microscopy coupled with a digitized-image analysis system. The differences were statistically analyzed with analysis of variance. Statistical differences between fibers length (p 0.0001) and diameter of the vessels (p 0.001) from the two localities were found. The locality Linares, Nuevo León, Mexico, with higher precipitation and lower temperature, showed higher fiber length and higher diameter of the vessels than China, Nuevo León. Hard environmental conditions, where low precipitation values and high temperatures prevail, condition P. laevigata trees do reduce the risk of losing water.

关键词： Wood Anatomy Prosopis laevigata Vessels Fiber

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干颗粒系统的摩擦流变性研究

Acta Mechanica Sinica 2023年第1期39卷 98-109页

作者：满腾张沛葛转佘吉鸿 Kimberly MHill Key Laboratory of Coastal Environment and Resources of Zhejiang Province School of Engineering Westlake University Hangzhou 310024 China College of Civil Engineering and Architecture Zhejiang University Hangzhou 310058 China Saint Anthony Fall Laboratory and the Department of Civil Environmental and Geo- Engineering University of Minnesota Minneapolis MN 55455 United States

颗粒材料在自然界和工程应用中极为常见,深入理解并合理利用其流变性对于预测与减轻自然灾害以及描述多种工程材料力学性质至关重要.然而,现有研究仍未建立起颗粒之间摩擦特性与颗粒集合体宏观的力学特性之间的物理联系.本文利用离散单... 详细信息

颗粒材料在自然界和工程应用中极为常见,深入理解并合理利用其流变性对于预测与减轻自然灾害以及描述多种工程材料力学性质至关重要.然而,现有研究仍未建立起颗粒之间摩擦特性与颗粒集合体宏观的力学特性之间的物理联系.本文利用离散单元法(DEM)考察了不同颗粒间摩擦系数对定压剪切条件下的颗粒材料的流变性的影响,试图建立基于粒间摩擦的颗粒流变学模型.本研究计算显示,增加颗粒之间的摩擦系数可以显著改变颗粒集合体的整体流变特性,增加颗粒系统的有效摩擦系数µeff,并减小定压剪切条件下的稳态固体体积分数ϕs.在此基础上,本报告提出用于描述不同粒间摩擦特性颗粒材料流变性的无量纲数M,并建立摩擦流变模型.同时考察了M和无量纲颗粒温度Θ之间的关系,分析了摩擦系数对于粒间作用力概率分布函数的影响.进一步延伸了传统的流变模型的应用范围,有助于建立更为普适的颗粒材料本构模型.

关键词：材料力学性质颗粒材料流变学模型概率分布函数颗粒系统摩擦特性无量纲数流变模型

Effects of Microselective Neurotomy on Focal Spasticity and Description of the Surgical Technique

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Open Journal of Modern Neurosurgery 2021年第3期11卷 144-156页

作者： sergio A. Sacchettoni Joyce Bolaños Napoleon torres Juan P. Abud Penelope Mantilla Luis Salazar Maria-Fernanda Vargas Julio Rodriguez-Wulff Randy Balladares Ricardo Gomez Service of Neurosurgery Hospital Vargas de Caracas Caracas Venezuela Service of Neurosurgery Centro Medico Docente La Trinidad Caracas Venezuela Neurological Unit “NeuroQX” Centro Médico Integra Caracas Venezuela Université Grenoble Alpes Grenoble France

We studied the microselective neurotomy (MSN) and its advantages to alleviate disabling spasticity. The best indication for MSN is focal spasticity. We performed 298 MSN, 87 nerves on the upper limb, 211 nerves on the lower limb) in 68 patients. The initial causes were: stroke, cranial trauma, postoperative complications and multiple sclerosis. MSN procedures were performed on the median nerve (n = 40) for wrist and finger flexion;musculo-cutaneus nerve (n = 38) for elbow flexion;ulnaris nerve (n = 9) for cubital deviation of the hand;gastrocnemius nerve (n = 98) and soleus nerve (n = 49) for equinus foot, tibial posterior nerve (n = 45) for varus foot, and fascicles (or bundles) of the flexor digitorum for “claw” toes (n = 19). The main preoperative test to identify the responsible nerve was a neuromuscular block with local anesthesia (lidocaine or bupivacaine) injected into the site of the nerve connecting the spastic muscle. During surgery, the identified nerve was exposed and its epineurium opened. Nerve bundles were teased apart into individual rootlets and a number of rootlets cut were previously planned, according to the spasticity. Follow-up was performed for up to 10 years, with a mean period of 29 months. Results demonstrated a reduction of limb spasticity of 2 to 3 points: modified Ashworth scale (MAS). Pain and clonus were also diminished in the affected limb. In some cases, voluntary movement was once again possible. MSN is a useful alternative in those cases of focal spasticity where physiotherapy and nerve block with botulinum toxin or phenol no longer produce satisfactory results.

关键词： Focal Spasticity Microselective Neurotomy Neurosurgery of Spasticity

SARS-CoV-2:Air pollution highly correlated to the increase in *** case of Guadalajara,Jalisco,Mexico

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Infectious Disease Modelling 2023年第2期8卷 445-457页

作者： Elizabeth torres-Anguiano Itzel Sanchez-Lopez Angeles Garduno-Robles Jorge David Rivas-Carrillo Edgar Alfonso Rivera-Leon sergio Sanchez-Enríquez Luis Fernando Ornelas-Hernandez Fernando Zazueta Leon-Quintero Eduardo Narciso Salazar Leon-Quintero Guillermo Enrique Juarez-Lopez Fernando Antonio Sanchez-Zubieta Mariana Ochoa-Bru Abraham Zepeda-Moreno Onkogenetik/Mexicana de Investigacion y Biotectogía S.A.de C.V GuadalajaraJaliscoMexico Unidad de Biología Molecular Investigacion y DiagnosticoHospital San JavierGuadalajaraJaliscoMexico Departamento de Fisiología Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajaraJaliscoMexico Departamento de Biología Molecular y Genomica Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajaraJaliscoMexico Departamento de Clínicas Centro Universitario de los AltosUniversidad de GuadalajaraTepatitlan de MorelosJaliscoMexico Departamento de Clínicas Medicas Centro Universitario de Ciencias de la SaludUniversidad de GuadalajaraGuadalajaraJaliscoMexico Servicio de Hemato-Oncología Pediatrica Hospital Civil de Guadalajara“Dr.Juan I.Menchaca”GuadalajaraJaliscoMexico Hospital Civil de Guadalajara“Fray Antonio Alcalde” GuadalajaraJaliscoMexico

Objectives:To determine whether air pollution or changes in SARS-CoV-2 lineages lead to an increase in ***:Descriptive statistics were used to calculate rates of infection(2020-2021).RT ePCR was used to compare viral loads from October 2020 to February *** sequencing(NGS)(n=92)was used to examine and phylogenetically map SARS-CoV-2 lineages.A correlative“air pollution/temperature”index(I)was developed using regression ***_(2.5),PM_(10),O_(3),NO_(2),SO_(2),and CO concentrations were analyzed and compared to the ***:The mortality rate during the last year was~32%.Relative SARS-CoV-2 viral loads increased in December 2020 and January *** revealed that approximately 80%of SARS-CoV-2 linages were B.1.243(33.7%),B1.1.222(11.2%),B.1.1(9%),B.1(7%),B.1.1.159(7%),and B.1.2(7%).Two periods were analyzed,the prehigh-and high-mortality periods and no significant lineage differences or new lineages were *** correlations of air pollution/temperature index values with mortality were found for IPM_(2.5) and IPM_(10).INO_(2).ISO_(2),and ICO but not for O_(3).Using ICO,we developed a model to predict mortality with an estimated variation of~±5 deaths per day.

关键词： Air pollution COVID-19 Guadalajara Mexico SARS-CoV-2 SARS-CoV-2 lineages

MLEA： A Solution for Users of Android in UTPVirtual

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Computer Technology and Application 2011年第5期2卷 406-412页

作者： Gisela torres de Clunie sergio Crespo Coelho da Silva Pinto Aris Linet Castillo Lucas Monteiro Braz Tasia Serrao Norman Rangel Jeanette Riley Olinda de Barraza Kexy Rodriguez Computer Systems Engineering Department Technological University of Panama Panama 0819 Panama Computer Science Research and Graduate Program in Applied Computing University of the Sinos Valley （UNISINOS） RS 93022-000 Brazil CIDITIC Technological University of Panama Panama 0819 Panama

This paper describes a design of an educational platform for a mobile learning architecture, which is a state of the an topic in distance education. The product will allow users to interact in an efficient, flexible, and transparent fashion with a web-based education environment, in this case Module Object-Oriented Dynamic Learning Environment （Moodle）, using Android mobile devices. In order to provide a strong and lasting architecture, the Service Oriented Architecture （SOA） methodology is used given that it allows easy software re-utilization as well as integration of heterogeneous services. The architecture is based on web services implemented with Representational State Transfer （REST）, as it has been demonstrated to be lighter and less consuming than other protocols, for devices with limited resources such as mobile devices. Web services provide the communication means between the server side and the client side of the architecture, whereas agents are used to deliver the services itself. The authors propose the development of an environment that facilitates the integration of various educational resources to support m-learning. An important aspect of the proposal is the offering of a tool to provide customized alerts for students and teachers, enabling them to remain updated about activities taking place in the courses.

关键词： Distance learning virtual education m-learning service oriented architecture (SOA) mobile learning mobile computing interoperability representational state transfer (REST).

Electrochemical Corrosion Study in H₂SO₄ of NiAl with Cu Additions, Microstructure and Micro-Hardness at Room Temperature

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Journal of Minerals and Materials Characterization and Engineering 2022年第3期10卷 225-241页

作者： Jesús M. Colín de la Cruz sergio A. Serna Barquera Alvaro torres-Islas Arturo Molina-Ocampo Edgar Valenzuela José G. González Rodríguez Universidad Autónoma del Estado de Morelos Facultad de Ciencias Químicas e Ingeniería UAEM-FCQeI. Av. Universidad 1001Colonia Chamilpa Cuernavaca Morelos México Universidad Autónoma del Estado de Morelos Centro de Investigación en Ingeniería y Ciencias Aplicadas UAEM-CIICAp Cuernavaca Morelos México UABC Baja California Sur México

For many years, intermetallic materials promise applications in a wide variety of technology areas. NiAl intermetallic compound is material that exhibits important characteristics such as high corrosion resistance and low density besides its ability to retain strength and stiffness at elevated temperatures. However NiAl intermetallic is too hard, brittle and exhibits very low ductility at room temperature being the reason because this material is not yet available for structural applications. In order to increase the ductility of the NiAl intermetallic compound, the addition of a third alloying element has been proved, nevertheless it is important to determine if such additions decrease or increase the hardness and the corrosion resistance of the alloy. So, the present investigation reports the corrosion performance of the NiAl intermetallic compound modified with Cu, emphasizing the EIS analysis and the relation between physical parameters and the modelling equations used in the Equivalent Electric Circuit. It was found that the addition of Cu promotes the formation of the γ’-Ni3Al phase in Cu contents greater than 15 at. %, in addition to a decrease in micro hardness and an increment in the Icorr values. In this way, the electrochemical characterization evidenced a high corrosion resistance of these intermetallic alloys.

关键词： NiAl-Cu Corrosion Behavior Electrochemical Impedance Spectrum Vickers Micro Hardness Microstructure

Dynamic Cerebral Microdialysis during Pallidotomy and Thalamotomy in Parkinson’s Disease: A Preliminary Neurochemical Study

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Open Journal of Modern Neurosurgery 2020年第2期10卷 284-296页

作者： sergio A. Sacchettoni Juan P. Abud Napoleon torres Yngo García Daniel A. Onay Juan Luis Rodulfo Juan Félix Del Corral Pedro Rada Rafael Galera Luis Hernández Service of Neurosurgery Hospital and School of Medicine JJ Vargas Universidad Central de Venezuela Caracas Venezuela Unit of Surgical Research Hospital and School of Medicine JJ Vargas Universidad Central de Venezuela Caracas Venezuela Univ. Grenoble Alpes CEA LETI Clinatec France Laboratory of Behavioral Physiology Faculty of Medicine Universidad de Los Andes Mérida Venezuela

In Parkinson’s disease (PD), dopaminergic neurons reduce the regulation of glutamatergic (glutamate-Glu) input from the cortex to neostriatum (caudate and putamen nuclei) consequently leading to a hyperactivity of globus pallidus internae (GPi) neurons that release gamma-amino-butyric acid (GABA) into the thalamic ventrolateral (VL) nucleus. The objective of the present experiment was to measure changes in GABA and Glu in the caudate and the thalamus of 2 patients during the application of electrical stimuli following either a pallidotomy or a thalamotomy. Proper insertion of the electrode was tested by applying high frequency electrical pulses (HFEP). During these procedures, we obtained neurochemical information placing cerebral (CMD) microdialysis probes in caudate nucleus and VL nucleus of ipsi- and contra-lateral thalamus. In VL thalamus, extracellular GABA decreased during HFEP, tending to reach previous levels once HFEP was finalized. Following the pallido- or thalamotomy GABA decreased again. Similarly, in the contralateral VL thalamus, extracellular GABA levels showed a similar but less pronounced profile but did not show any decrement after the lesion. Caudate Glu decreases when HFEP is applied to the GPi and recovers to previous levels after HFEP, but did not decrease again after lesion (GPi-tomy), instead it continued to rise. These results suggest that HFEP exerts a similar but reversible biochemical effect as thermopallido- or thermothalamotomy on GABA extracellular concentration in the ipsilateral VL thalamus. We also observe a distant effect of HFEP, but not of thermolesion, on contralateral thalamic GABA and ipsilateral caudate Glu.

关键词： Cerebral Microdialysis Parkinson’s Disease Pallidotomy Thalamotomy Basal Ganglia Circuit Cerebral Electromodulation DBS

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单一大颗粒在颗粒流中分选机制研究

单一大颗粒在颗粒流中分选机制研究

Post-Hospital Syndrome and Hyponatremia

中国力学大会-2021+1

作者：满腾 sergio A.Galindo-torres K.M.Hill 西湖大学 University of Minnesota

简介Introduction颗粒材料是自然界和工业界中常见的一类材料。过去几十年,国内外学者通过广泛的试验和计算研究对颗粒材料,特别是单一粒径的颗粒材料,的宏观流变性及其与细观尺度的颗粒间相互作用的关系进行了深入研究。现实中,颗粒材...

简介Introduction颗粒材料是自然界和工业界中常见的一类材料。过去几十年,国内外学者通过广泛的试验和计算研究对颗粒材料,特别是单一粒径的颗粒材料,的宏观流变性及其与细观尺度的颗粒间相互作用的关系进行了深入研究。现实中,颗粒材料多以多粒径的形式存在,因而多粒径颗粒材料在流动过程中的分选现象及其机理就显得尤为重要。本研究着重探索颗粒流中仅存在单一大颗粒的情况下,大颗粒在颗粒流中的运移情况。

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Health 2021年第8期13卷 846-856页

作者： José Bellod-Tonda Julio Blázquez-Encinar María Dolores Jover-Ríos Carmen Seguí-Pérez Juan Méndez-Mora Francisco Caparrós-Hernández Álex Méndez-Jover Marc Seguí-Pérez David Baláž Leticia Espinosa del Barrio Jesús Corbacho-Redondo Carles García-Cervera Juan Manuel Núñez-Cruz Isidro Hernández-Isasi Javier Guzmán-martínez Angie Gómez-Uranga Pedro Esteve-Atiénzar Jorge Peris-García Veronica martínez-Sempere Eliana Damonte-White Óscar Hernando Ruiz-Ariza Juan Carlos López-Corbalán Lourdes Lajara-Villar Andrea Riaño-Pérez Paloma Chazarra-Pérez María Escamilla-Espínola Maria Luisa Asensio-Tomás Miguel Ángel Auladell-Alemany Laura Serna-torres Asunción Pérez-Fullana Amparo Gómez-Siurana sergio Menargues-Irles José Miguel Seguí-Ripoll Internal Medicine Department University Hospital of San Juan Alicante Spain Internal Medicine Department Torrevieja University Hospital Alicante Spain Internal Medicine Department Hospital La Vega Baja of Orihuela Alicante Spain CEU Cardinal Herrera University Veterinary Hospital Valencia Spain Secondary School Marist Brothers High School Alicante Spain Department of Clinical Medicine Miguel Hernández University Elche Spain Primary Care Medicine Benilloba Spain Sub-Delegation of the Government Alicante Spain Chemical Engineering Department University of Alicante Alicante Spain

Introduction: Post-hospital syndrome (PHS) is defined as a period of vulnerability during the first 30 days after a patient is discharged from hospital, in which multiple factors come into play. Hyponatremia is the most frequent hydroelectrolytic disorder in hospitalized patients and may be related to the appearance of PHS. Objective: The objective is to estimate the prevalence of PHS that is assessed as the rate of readmissions in the first 30 days after discharge, in patients with hyponatremia. Material and Methods: It is a descriptive observational study of patients with hyponatremia who were discharged from 1 September 2010 to 2 February 2020 at the Internal Medicine Service of the Hospital University of San Juan (Alicante, Spain). Results: Of the 25 included patients, 5 (20%) were readmitted within a month of discharge, after a mean of 11.4 days (standard deviation [SD] 5.1). The overall mortality of the study was 20% (n = 5), with one case of death in the first 30 days post-hospitalization (4%). In 12 patients (48%) the origin of the hyponatremia was undetermined. The most frequently recorded etiology for the condition was pharmacological (n = 7, 28%), and there was pronounced variability in its clinical and laboratory study. The most widely used corrective measure was drug withdrawal, in 16 patients (64%). Water intake restriction was the most common treatment after discharge (5 patients, 20%), followed by urea (2 patients, 8%), while tolvaptan was not used. Conclusion: Hyponatremia may be the cause of PHS, which could increase the rate of early readmission. Hyponatremia is an underdiagnosed and undertreated entity, so it is necessary to apply an appropriate system to optimize its management and, in future studies, to assess its impact on PHS.

关键词： Hospitalization Hyponatremia Patient Readmission Inappropriate ADH Syndrome