3,883 research outputs found
Papilla preservation periodontal surgery in periodontal reconstruction for deep combined intra-suprabony defects. Retrospective analysis of a registry-based cohort
Suprabony defects are the most prevalent defects and there is very little evidence on their treatment. This study aims to assess the effectiveness of papilla preservation periodontal surgery in the periodontal reconstruction of combined deep intra-suprab
Study of the genetic homogeneity of Albarino (Vitis vinifera L.) growing in Galicia (Spain) using isozyme and RAPD markers
Research NoteAn evaluation of the genetic diversity of cv. Albarino (Vitis vinifera L.) was carried out. Centenarian and young plants were selected from vineyards, some of them showing slight ampelographic differences. Using ELISA tests 5 out of 24 plants were found to be infected with grapevine leafroll-associated virus 3 (GLRaV-3). In order to evaluate genetic polymorphism, 10 enzyme systems and 42 RAPD primers were used. The 73 isozyme and 308 RAPD markers were common in the samples tested. The results show the existence of a genetic homogeneity within Albarino cultivated in Galicia. Minor ampelographic differences among samples could be due to external factors rather than to genetic differences
Development of type 2 diabetes mellitus thirty-one years after Billroth II in a patient asking for diabetes surgery
Introduction: Diabetes surgery in obese and slim patients seems to be a superior alternative to the current medical treatment. Gastric bypass is an alternative treat- ment for diabetes. Nevertheless, there are still doubts whether diabetes can recur if you gain weight or if the effects are maintained over time. Other questions refer to the type of surgery to make the bypass limb length or reservoir size for the resolution of the Diabetes Mellitus. Presentation of case: Male patient 69-year-old came to us in order to perform tailored One Anastomosis Gastric Bypass (BAGUA) to treat his type 2 diabetes mellitus and metabolic syndrome. He has a history of peptic ulcer treated with subtotal gastrectomy and Billroth II recons- truction 49 years ago. He currently is not obese and deve- loped diabetes 31 years after surgery. Discussion: Globally there are no reports of patients with normal BMI that after performing gastric bypass developed diabetes mellitus. There are cases where obese diabetic patients after gastric bypass improve or remits the T2DM, but it relapses due to insufficient weight loss or gain it. The patient with gastric bypass Billroth II type, should not developed diabetes. He is normal weight and not had weight gain that could be linked to the develop- ment of diabetes. Conclusions: The results generated by bariatric surgery are encouraging, but still do not clarify the precise way how surgery produces rapid improvement of systemic metabolism as in diabetes, but in our patient, the effect was quite different because the gastric bypass had no protective effect against diabetes
“Education Network” a new way to teach Chemistry
The complexity of chemistry has implications for the teaching of chemistry. That chemistry is a very complex subject. The majority of the students at University think that chemistry is a difficult discipline and they have difficulty in understanding the concepts. Moreover, students' interest in chemistry decreases the first year at university. The reason for this decrease might be that the contents of chemistry laboratory classes are boring, out of date and lacking of dynamism that students experience through visual media tools.
For these reasons, new programs and methodologies should be developed. Those are based on making chemistry relevant through problem solving and collaborative learning hold promise for reforming chemistry education. It is about an education according to circumstances, which is adapted to context and virtual behaviour of people.
It's time to CRUSH boredom by transforming your classroom into an Escape Room adventure. School-based escape games are a great teaching tool. The students while playing, learn. The most important point is that they won’t realize they’re doing both at the same time.
In this work, an educational gamification experience based on the escape room concept was developed. The first (Do It Yourself) DIY Escape Room was built the year before at Mechanical Engineer Degree started, that took more than three weeks of work. It was presented to other professors to the same subject at different degrees. That DIY Escape Room was modified and adapted to each group. Each professor changed the clues, problems and so on in order to orientate the topic as much as possible to their students.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech
ADQPCI: Data Acquisition Board for Educational purposes
En este trabajo se presenta una de las placas de adquisición de datos que se ha desarrollado con fines docentes para su utilización en prácticas relacionadas con sistemas en tiempo real e
informática industrial y se plantean algunas de las ventajas e inconvenientes frente a la utilización
de placas comerciales. A lo largo del trabajo se detalla el diseño del hardware, en el que se ha
priorizado la facilidad de programación, siendo ésta una de las ventajas frente a las placas
comerciales. En estas prácticas es fundamental que el alumno tome conciencia de la importancia
de la interfaz hardware-software, si se quiere conseguir un sistema fiable y que explote al máximo
las características del hardware. Con el desarrollo de una placa de adquisición de datos se
consigue un sistema que el alumno puede utilizar en varias asignaturas de su titulación que están
relacionadas con el desarrollo y programación de sistemas empotrados.In this work a data acquisition board developed for educational use in subjects related to real-time
systems and industrial computing, is presented. The main advantages and disadvantages of using
these boards versus the use of commercial boards are discussed. The hardware design described
along this work emphasizes the facility of programming the board, which is one of the main
advantages versus the commercial boards. In these practices it is essential that student
comprehend the importance of the hardware-software interface in order to obtain a reliable system
which exploits in a maximum way the characteristics of the hardware. The development of a data
acquisition board allows to obtain a system that the students can use in several course during his
university career which are related to the development and programming of embedded system
CAN2PCI: Board with Interface to CAN and PCI Bus for educational purposes
En este trabajo se presenta una placa con interfaz al bus CAN y PCI desarrollada para la
utilización en prácticas de las asignaturas relacionadas con redes de control. Se trata de una
placa de altas prestaciones pensada para su utilización docente gracias a su facilidad de
programación. La placa dispone de dos canales CAN independientes y permite acceso directo a
los registros del controlador CAN. Las prácticas tienen como objetivo conocer la red de control en
los niveles físico y de enlace y desarrollar un software de conectividad (middleware) que realice la
interfaz entre estas capas y la de aplicación de usuario. Se exponen también brevemente las
prácticas realizadas en una de las asignaturas donde se imparte redes de control, en la que es
fundamental la utilización de un hardware conocido que permita programar las funciones básicas
que operan directamente con el controlador de bus CANIn this work the development of a board with interface to the CAN and PCI bus for its use in lab
courses related to control networks, is presented. This board has high benefits and advantages
and has been implemented for educational purposes due to its programming facility. The board
has two independent CAN channels and it allows direct access to the registers of the CAN
controller. The objective of the lab experiments is to study the control networks in the physical and
link levels and to develop a middleware that performs the interface between these layers and the
user application. The experiments done in one of the courses, which includes control networks, are
briefly described. In these practical labs it is very important the use of a known hardware that
allows programming the basic functions which directly operate with the CAN bus controlle
Output-feedback IDA stabilisation of an SMIB system using a TCSC
Interconnection and damping assignment (IDA) passivity-based control (PBC) is currently a well-known viable alternative for solving regulation control problems of a wide class of nonlinear systems. However, a distinctive
feature that, in spite of its appearance under several applications, has not been exhaustively exploited, is the
flexibility that this technique exhibits for designing output-feedback controllers (OFCs). The purpose of this article is to illustrate this attractive characteristic by approaching the (practically important) case study given by the improvement of the transient stability properties of power systems. The particular system composed by a
synchronous generator connected to an infinite bus via a thyristor controlled series capacitor is considered.
Two OFCs are presented, one that does not involve the unmeasurable state and another that, although including this state, presents some input-to-state stability properties that allow for establishing a sort of separation principle concerning an observer-based structure for the closed-loop system. The advantages of both controllers
are illustrated by numerical simulations when a three-phase short circuit at the generator bus is induced.Postprint (published version
Pressure-Induced Phase-Transition Sequence In Cof 2 : An Experimental And First-Principles Study On The Crystal, Vibrational, And Electronic Properties
We report a complete structural study of CoF2 under pressure. Its crystal structure and vibrational and electronic properties have been studied both theoretically and experimentally using first-principles density functional theory (DFT) methods, x-ray diffraction, x-ray absorption at Co K-edge experiments, Raman spectroscopy, and optical absorption in the 0–80 GPa range. We have determined the structural phase-transition sequence in CoF2 and corresponding transition pressures. The results are similar to other transition-metal difluorides such as FeF2 but different to ZnF2 and MgF2, despite that the Co2+ size (ionic radius) is similar to Zn2+ and Mg2+. We found that the complete phase-transition sequence is tetragonal rutile (P42/mnm) → CaCl2 type (orthorhombic Pnnm) → distorted PdF2 (orthorhombic Pbca)+PdF2 (cubic Pa3¯) in coexistence → fluorite (cubic Fm3¯m) → cotunnite (orthorhombic Pnma). It was observed that the structural phase transition to the fluorite at 15 GPa involves a drastic change of coordination from sixfold octahedral to eightfold cubic with important modifications in the vibrational and electronic properties. We show that the stabilization of this high-pressure cubic phase is possible under nonhydrostatic conditions since ideal hydrostaticity would stabilize the distorted-fluorite structure (tetragonal I4/mmm) instead. Although the first rutile → CaCl2-type second-order phase transition is subtle by Raman spectroscopy, it was possible to define it through the broadening of the Eg Raman mode which is split in the CaCl2-type phase. First-principles DFT calculations are in fair agreement with the experimental Raman mode frequencies, thus providing an accurate description for all vibrational modes and elastic properties of CoF2 as a function of pressure
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