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Risk factors in dropping out of nursing studies

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Open Journal of Nursing 2014年第1期4卷 9-14页

作者： Milagros De la Rosa Hormiga Candelaria de la Merced Díaz-González Josefa María Ramal López juan manuel Herrera Hernández Universidad de La Laguna San Cristóbal de La Laguna Spain Universidad de Las Palmas de Gran Canaria Las Palmas de Gran Canaria Spain Universidad de Las Palmas de Gran Canaria Nurse of Hospital Insular de Gran Canaria Las Palmas de Gran Canaria Spain

School failure is a worrying phenomenon of the educational system that affects most sectors of the education regarding parents, teachers and students and covers education at all levels, from basic education levels to higher levels. One of the levels where there is a high incidence of this problem is in university education, where dropout rates at university are between 25% and 50% in the early formative years. Therefore, it is considered that this phenomenon of school failure and dropout must be addressed and treated from all support systems and services that merge at school, because there are many interests involved not only in the student who fails himself, but also in society in general. The objective of this survey is finding out the effects of anxiety and personal problems in ULPGC nursing students and the consequences that can bring in their academic performance. The results obtained show direct influence of variables such as attendance, studies organization, disappointment feelings, approaching dropout and others, however the hypotheses that were not met differentially, offer us relevant information, for better understanding and making decisions to prevent school failure at university.

关键词： School Failure Higher Education Anxiety

Productivity of White and Yellow Grain Corns in Campeche, México

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Agricultural Sciences 2019年第9期10卷 1255-1269页

作者： juan Medina-Méndez Jesús manuel Soto-Rocha Antonio Villalobos-González Víctor Hugo Volke-Haller Joaquín Gómez-Tejero Campo Experimental Edzná Instituto Nacional de Investigaciones Forestales Agrícolas y Pecuarias Campeche México Postgrado en Edafología Colegio de Postgraduados Montecillo México

The present work took place in the central and northern regions of the state of Campeche, Mexico. The grain yield was evaluated in a total of 46 materials, comprising 30 of white grain and 16 of yellow grain. The crop was supplied to a greater extent with rainwater from the months of July to November. The sowing was in trials designed to evaluate grain yield and technology validation lots established for demonstration purposes. To integrate a genetic material into this study, it was a fundamental requirement that it had at least four evaluations considering different locations or years. As a result of the above, it was determined that there are 27 hybrids of white grain and 14 of yellow grain, which constitute options for the producer with which it is possible to obtain yields of 4.1 to 6.0 t⋅ha−1 and that can make corn a profitable crop under the current conditions of technology application. Of the white grain hybrids, the group formed by SB-309, DK-395, DK-393, DAS-2382, SP-500, DK-390, P4082W, 9209W, P3966W, SORENTO, JC-25, LUCINO, and 9401W was considered as the high productivity stratum, whose average yield is 5.1 to 5.9 t⋅ha−1. Similarly, in the yellow grain hybrids, the group formed 9107Y, SP-525A, 2B688, DK-7500, P4226A, IMPACT and DK-7088, was considered as the high productivity stratum, whose average yield fluctuated from 5.0 to 5.9 t⋅ha−1.

关键词： White and Yellow Maize Tropics Arable Soils

The westward lithospheric drift,its role on the subduction and transform zones surrounding Americas:Andean to cordilleran orogenic types cyclicity

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Geoscience Frontiers 2020年第4期11卷 1219-1229页

作者： Eugenio Aragon Fernando D'Eramo Marco Cuffaro Carlo Doglioni Eleonora Ficini Lucio Pinotti Silvina Nacif manuel Demartis Irene Hernando Tomas Fuentes Centro de Investigaciones Geologicas Universidad Nacional de La PlataArgentina Instituto de Ciencias de La Tierra Biodiversidad y Ambiente(ICBIA).Departamento de GeologíaUniversidad Nacional de Río Cuarto(UNRC-CONICET)Ruta 36 Km 601Río CuartoCordobaArgentina Istituto Geologia Ambientale e Geoingegneria-CNR Italy Dipartimento de Scienzedella Terra Universita La SapienzaItaly Instituto Geofísico Sismologico F.Volponi Universidad Nacional de San JuanArgentina

We investigate the effect of the westerly rotation of the lithosphere on the active margins that surround the Americas and find good correlations between the inferred easterly-directed mantle counterflow and the main structural grain and kinematics of the Andes and Sandwich arc *** the Andes,the subduction zone is shallow and with low dip,because the mantle flow sustains the slab;the subduction hinge converges relative to the upper plate and generates an uplifting doubly verging *** Sandwich Arc is generated by a westerly-directed SAM(South American) plate subduction where the eastward mantle flow is steepening and retreating the subduction *** this context,the slab hinge is retreating relative to the upper plate,generating the backarc basin and a low bathymetry single-verging accretionary *** Central America,the Caribbean plate presents a more complex scenario:(a) To the East,the Antilles Arc is generated by westerly directed subduction of the SAM plate,where the eastward mantle flow is steepening and retreating the subduction zone.(b) To the West,the Middle America Trench and Arc are generated by the easterly-directed subduction of the Cocos plate,where the shallow subduction caused by eastward mantle flow in its northern segment gradually steepens to the southern segment as it is infered by the preexisting westerly-directed subduction of the Caribbean *** the frame of the westerly lithospheric flow,the subduction of a divergent active ridge plays the role of introducing a change in the oceanic/continental plate’s convergence angle,such as in NAM(North American)plate with the collision with the Pacific/Farallon active ridge in the Neogene(Cordilleran orogenic type scenario).The easterly mantle drift sustains strong plate coupling along NAM,showing at juan de Fuca easterly subducting microplate that the subduction hinge advances relative to the upper *** lower/upper plate convergence coupling also applies along strike to the neigh

关键词： Lithospheric drift Converging hinge Diverging hinge Slab rollbakc Terranes

Influence of in vitro capacitation time on structural and functional human sperm parameters

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Asian Journal of Andrology 2020年第5期22卷 447-453页

作者： Paula Saez-Espinosa Natalia Huerta-Retamal Laura Robles-Gomez manuel Aviles Jon Aizpurua Irene Velasco Alejandro Romero Maria Jose Gomez-Torres Department of Biotechnology Faculty of ScienceUniversity of AlicanteAlicante 03080Spain FISABI0-University Hospital of San juan de Alicante Service of Gynecology and ObstetricsSan Juan de Alicante 03550Spain Departm ent of Cell Biology and Histology Faculty of MedicineUniversity of Murcia and IMIB-ArrixacaMurcia 30100Spain IVF Spain Reproductive MedicineAlicante 03540Spain University Hospital of San juan de Alicante Service of Gynecology and ObstetricsSan Juan de Alicante 03550Spain Human Fertility Cathedra University of AlicanteAlicante 03080Spain.

A cascade of dramatic physiological events is linked to the sperm acrosome reaction and binding to the oocyte's zona pellucida during human sperm ***,structural and functional sperm changes during capacitation currently remain poorly ***,we performed a multibiomarker approach based on the utilization of sperm concentration,motility,viability,morphology,acrosome reaction,tyrosine phosphorylation,DNA fragmentation,and lectin-binding sites to analyze the impact caused by swim-up selection times(uncapacitated,1 h capacitated,and 4 h capacitated)on sperm function and structure in normozoospermic *** found that a 4 h swim-up capacitation increased sperm quality,because a large number of cells with normal morphology and lower DNA fragmentation rates were ***,the long-term capacitation induced a higher percentage of cells with tyrosine phosphorylation of the principal piece as well as a redistribution of lectin-binding ***,the multivariate biomarkers analyzed showed a less variable distribution on spermatozoa recovered after 4 h capacitation than that with the shorter capacitation *** findings stress the importance of capacitation time as a relevant factor in sperm quality with potential biological reproductive implications both for basic research and in assisted reproduction techniques.

关键词： acrosome reaction capacitation DNA fragmentation glycocalyx lectin-binding sites membrane integrity protein phosphorylation sperm selection

Inflammatory pseudotumour of the spleen associated with splenic tuberculosis

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World Journal of Gastrointestinal Surgery 2014年第12期6卷 248-252页

作者： Maria Isabel Prieto-Nieto juan Pedro Pérez-Robledo Beatriz Díaz-San Andrés manuel Nistal José Antonio Rodríguez-Montes Department of General and Digestive Surgery La Paz University Hospital Paseo de la Castellana 28046 Madrid Spain Department of Pathology La Paz University Hospital Paseo de la Castellana 28046 Madrid Spain

Inflammatory pseudotumor(IPT) of the spleen is an uncommon entity with an uncertain aetiology. Inflammatory pseudotumors present diagnostic difficulties because the clinical and radiological findings tend to suggest a malignancy. The symptoms include weight loss, fever, and abdominal pain. Most cases of splenic IPT present solitary relatively large well circumscribed masses on imaging. The diagnosis in the majority of the cases is made after histopathologic study of splenectomy specimens. The IPTs that occur in the spleen and liver are typically associated with Epstein-Barr virus. Thirtyseven percent of all new cases of active tuberculosis infection are extrapulmonary tuberculosis and tuberculous lymphadenitis the most commonly occurring form of extrapulmonary tuberculosis. We report the case of an inflammatory pseudotumor of the spleen associated with splenic tuberculous lymphadenitis in a 50-year-old female patient who was preoperatively diagnosed with a malignant spleen tumour based on her history of breast of carcinoma.

关键词： Inflammatory pseudotumour Spleen Splenic lymphadenitis Splenectomy Splenic tuberculosis

Achieving the best bowel preparation for colonoscopy

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World Journal of Gastroenterology 2014年第47期20卷 17709-17726页

作者： Adolfo Parra-Blanco Alex Ruiz manuel Alvarez-Lobos Ana Amorós juan Cristóbal Gana Patricio Ibáez Akiko Ono Takahiro Fujii Department of Gastroenterology Escuela de MedicinaPontificia Universidad Católica de ChileSantiago 833-0024Chile Department of Gastroenterology Hospital Universitario de la Candelaria38916 Santa Cruz de TenerifeSpain Gastroenterology and Nutrition Unit Division of PediatricsEscuela de MedicinaPontificia Universidad Católica de ChileSantiago 833-0024Chile Department of Gastroenterology Hospital Universitario Virgen de la Arrixaca30001 MurciaSpain TF Clinic Tokyo 197-0804Japan

Bowel preparation is a core issue in colonoscopy,as it is closely related to the quality of the *** often find that bowel preparation is the most unpleasant part of the *** is widely accepted that the quality of cleansing must be excellent to facilitate detecting neoplastic *** spite of its importance and potential implications,until recently,bowel preparation has not been the subject of much *** most commonly used agents are high-volume polyethylene glycol(PEG)electrolyte solution and sodium *** has been some confusion,even in published meta-analyses,regarding which of the two agents provides better *** is clear now that both PEG and sodium phosphate are effectivewhen administered with proper ***,the timing of administration is recognized as one of the central factors to the quality of *** bowel preparation agent should be administered,at least in part,a few hours in advance of the *** low volume agents are available,and either new or modified schedules with PEG that usually improve *** adjuvants can also be used to reduce the volume of PEG,or to improve the efficacy of other *** factors apart from the choice of agent can improve the quality of bowel *** instance,the effect of diet before colonoscopy has not been completely clarified,but an exclusively liquid diet is probably not required,and a low-fiber diet may be preferable because it improves patient satisfaction and the quality of the *** patients,such as diabetics and persons with heart or kidney disease,require modified procedures and certain *** preparation for pediatric patients is also reviewed *** such cases,PEG remains the most commonly used *** detecting neoplasia is not the main objective with these patients,less intensive preparation may *** considerations must be made for patients with inflammatory bowel disease,including

关键词： Colonoscopy Optimal preparation Polyethylene glycol Sodium phosphate Special patients Timing

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空中防撞系统：提高空中安全的决议咨询算法

应用科技 2022年

作者： juan manuel Nzamio Mba Andeme 刘庆玲 Abdul Hadi 哈尔滨工程大学信息与通信工程学院

随着航空界向下一代航空运输系统 (Next-Gen) 迈进，当前的交通警报和防撞系统(TCAS II)可能无法完全保障航空安全，因此如何防止空中碰撞是下一代交通系统的一个重要问题。为解决此问题，本文介绍了一种新技术，用于检测和解决三维(3-D... 详细信息

随着航空界向下一代航空运输系统 (Next-Gen) 迈进，当前的交通警报和防撞系统(TCAS II)可能无法完全保障航空安全，因此如何防止空中碰撞是下一代交通系统的一个重要问题。为解决此问题，本文介绍了一种新技术，用于检测和解决三维(3-D)空域中两架飞机之间的空中交通冲突。首先，该算法计算一组六个决议咨询 (RA) 并结合决断警报时间，以确保不侵犯保护区。该算法提出了三种技术上称为安全规则的解决方案，用于提高飞机面对面、飞机交叉道和飞机超车这三种场景下的安全性。本文将2002年7月1日晚上发生的 überlingen 空中碰撞作为最大的悲剧之一进行了分析，该悲剧导致林肯实验室的研究人员创建了先进的解析算法技术，以应对防撞系统的重大挑战。本文在提出的三个安全规则基础上进行仿真，以验证所提出算法的有效性，仿真结果表明，本文提出的方法相较于传统方法具备一定的优越性。

关键词：下一代航空运输系统交通警报和防撞系统决议咨询空中碰撞

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套管换热器温差校正系数速算

化工装备技术 1992年第3期13卷 42-43页

作者： Alejandro Anaya Durand juan manuel Maldonado 史新辉

混联(串并联)套管式换热器通常用于这种情况:参与热交换的流体彼此间的质量流量差别较大,而热值交换又较少。如何计算这种换热器的真实温差,因热传导方程为:Q=UA△t,故其中真实温差△t可用对数平均温差LMTD乘以一个校正系数F:表示:

关键词：套管式换热器温差系数速算

Structure of the Community of Dominant Fish Species Associated to Soft-Bottoms in the Lagoon of La Paz, B.C.S., México

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Open Journal of Marine Science 2020年第3期10卷 79-92页

作者： Bruma R. Castillo-Rosas Emelio Barjau-González juan manuel López-Vivas Abril Karim Romo-Piñeda Eleonora Romero-Vadillo Jose Ángel Armenta-Quintana Departamento Académico de Ciencias Marinas y Costeras Universidad Autónoma de Baja California Sur La Paz México Departamento Académico de Ciencia Animal y Conservación del Hábitat Universidad Autónoma de Baja California Sur La Paz México

The study of fish communities from coastal lagoons allows a better understanding of role of these organisms in these systems, and the effect of anthropogenic impact. The aim of the present study was to determine the community structure, in particular dominance of fish species associated to soft bottoms in the lagoon of La Paz. Six bimonthly samplings were carried out in seven localities from November 2016 to September 2017 and physicochemical parameters were recorded. Analysis of temperature showed differences between two marked seasons, warm and cold. Species richness showed differences between months and localities. Shannon-Weaver index and Pielou’s evenness showed significant differences only between months. Simpson’s index suggests a high diversity. According to the BVI, 15 species from the families Haemulidae, Sciaenidae and Gerreidae, were the most biologically important. Zoogeographic affinity analysis showed that 58% of the species prefer the Province of Cortez. Dominant species recorded in this study play a key role in soft-bottom systems like the lagoon of La Paz.

关键词： Coastal Lagoon Lagoon of La Paz Diversity Dominance