Temperature dependent charge transport mechanisms in carbon sphere/polymer composites

Carbon spheres (CS) with diameters in the range $2 - 10 \mu m$ were prepared via hydrolysis of a sucrose solution at $200^o C,$ and later annealed in $N_2$ at $800^o C.$ The spheres were highly conducting but difficult to process into thin films or pressed pellets. In our previous work, composite samples of CS and the insulating polymer polyethylene oxide (PEO) were prepared and their charge transport was analyzed in the temperature range $80 K < T < 300 K.$ Here, we analyze charge transport in CS coated with a thin polyaniline (PANi) film doped with hydrochloric acid (HCl), in the same temperature range. The goal is to study charge transport in the CS using a conducting polymer (PANi) as a binder and compare with that occurring at CS/PEO. A conductivity maxima was observed in the CS/PEO composite but was absent in CS/PANi. Our data analysis shows that variable range hopping of electrons between polymeric chains in PANi-filled gaps between CS takes on a predominant part in transport through CS/PANi composites, whereas in CS/PEO composites, electrons travel through gaps between CS solely by means of direct tunneling. This difference in transport mechanisms results in different temperature dependences of the conductivity.Comment: 7 pages, 6 figure

Diagnóstico del compromiso organizacional de los distribuidores independientes de la empresa Omnilife en la ciudad de Chiclayo, 2016

La presente investigación tuvo como objetivo general realizar un diagnóstico del compromiso organizacional de los distribuidores independientes de la empresa Omnilife en la ciudad de Chiclayo, en el año 2016, esta investigación fue descriptiva, de diseño no experimental y corte transversal. Para la recolección de datos se utilizó el cuestionario de compromiso organizacional de Meyer y Allen (1997), para la cual se utiliza una escala tipo Likert y está conformada por 18 afirmaciones o ítems; aplicada una muestra de 248 distribuidores independientes, los cuales se dividirá proporcionalmente a la población entre hombres y mujeres, utilizando un muestreo probabilístico. Los resultados de este trabajo de investigación mostraron que el 55.65% de distribuidores independientes de la empresa Omnilife se encuentra en un nivel medio o promedio, por tanto, se determina que la mayoría de la población estudiada encuentra comprometida con la organización, Además, de obtener resultados en distintos niveles con respecto a las tres dimensiones que posee la variable analizada; en el siguiente orden, primero el compromiso afectivo, seguido del compromiso normativo y por último el compromiso continuo, con valores de 4.80, 4.52 y 4.31 respectivamente

Violencia familiar e inteligencia emocional en estudiantes de nivel secundario de una institución educativa pública de Ate Vitarte, 2019

La presente investigación lleva como título “Violencia Familiar e Inteligencia Emocional en estudiantes de nivel secundario de una Institución Educativa Pública de Ate Vitarte, 2019” tiene como objetivo identificar la relación que existe entre violencia familiar e inteligencia emocional. En su metodología se utiliza un enfoque cuantitativo, el diseño de investigación es no experimental y correlacional transversal. La muestra estuvo conformada por 300 estudiantes, los instrumentos aplicados fueron el cuestionario de violencia familiar- S.A.M.M y el inventario de inteligencia emocional de Barón: versión para jóvenes- EQi:YQ. Los resultados obtenidos mostraron un nivel negativo medio (R= -344). Y un 0,00 de significancia. Se concluye que existe una relación inversa entre las variables

Re-conociendo la Igualdad y la Violencia Basada en Género: una mirada desde la metodología a distancia.

Tablas, figuras y anexosEl presente trabajo de investigación busca comprender la Violencia Basada en Género (VBG) y la concepción de Igualdad de género en la comunidad educativa de la Universidad Nacional Abierta y a Distancia - UNAD, de la Zona Centro Sur; mediante un estudio mixto, se realizó la identificación de los tipos de violencia basada en género, que han experimentado los estudiantes en el sistema de educación superior en la metodología a distancia; se caracterizan las situaciones que se les presentan y finalmente se compara la comprensión que tienen los estudiantes al respecto. El proceso investigativo, se desarrolla desde un enfoque mixto, en el cual se aplican los métodos cuantitativo y cualitativo, mediante diferentes instrumentos que, para el caso de la presente investigación, hizo uso de encuestas y entrevistas semi estructuradas; los resultados llevan a encontrar los tipos de violencia basadas en género que han experimentado y las situaciones de desigualdad que viven.This research work seeks to understand Gender-Based Violence (GBV) and the conception of Gender Equality in the educational community of the National Open and Distance University - UNAD, in the South Central Zone; through a mixed study, the identification of the types of gender-based violence experienced by students in the higher education system in the distance methodology was carried out; the situations that are presented to them are characterized and finally the understanding that the students have in this regard is compared. The investigative process is developed from a mixed approach, in which quantitative and qualitative methods are applied, through different instruments that, in the case of this investigation, made use of surveys and semi-structured interviews; the results lead to finding the types of gender-based violence they have experienced and the situations of inequality they experience

RFID-triggered power activation for smart dynamic inductive wireless power transfer

A RFID-triggered power activation system is devised, implemented and tested as the key sensing mechanism for controlling wireless power transfer from an inductive lane to a moving lightweight electric vehicle. The RFID reader and tag used are based on ISO/IEC-14443A compatible types, working at 13.56 MHz, one of the least expensive currently available passive near-field technologies. In order to fit lightweight electric mobility application requirements, the RFID magnetic antennas are redesigned to larger than standard sizes, both at reader and tag sides, increasing the detection volume without increasing the required reading power, thus permitting the reuse of commercial RFID circuits and embedded protocol software. To trigger the wireless power transfer, a RFID reader coil is placed magnetically orthogonal to each primary power coil to be controlled, at the extremity where electric vehicles are expected to come from, in a one-way traffic. The power is turned off automatically when the vehicle leaves the primary coil field and the power demand is extinguished, or when time-out is reached. An inductive lane constituted of a sequence of such RFID-controlled primary coils can detect the presence of authorized electric vehicles and smartly energize the lane, manipulating the unique identifier codes and other information stored in the on-board tag to more efficiently handle dissimilar power level demands, and to implement tolling. The performance of the system is predicted based on the reconstructed 3D digital model of the RFID main detection lobe.Universidade de Vigo - Department of Electronics Technolog

Role of Smac/DIABLO in cancer progression

Second mitochondria-derived activator of caspase/direct inhibitor of apoptosis-binding protein with low pI (Smac/DIABLO) is a proapoptogenic mitochondrial protein that is released to the cytosol in response to diverse apoptotic stimuli, including commonly used chemotherapeutic drugs. In the cytosol, Smac/DIABLO interacts and antagonizes inhibitors of apoptosis proteins (IAPs), thus allowing the activation of caspases and apoptosis. This activity has prompted the synthesis of peptidomimetics that could potentially be used in cancer therapy. For these reasons, several authors have analyzed the expression levels of Smac/DIABLO in samples of patients from different tumors. Although dissimilar results have been found, a tissue-specific role of this protein emerges from the data. The objective of this review is to present the current knowledge of the Smac/DIABLO role in cancer and its possible use as a marker or therapeutic target for drug design

Dynamic inductive power transfer lane design for e-bikes

This paper presents the concept and initial test results of an inductive lane design capable of dynamic and wirelessly transfer power to electric bicycles (e-bikes). On the lane side, a sequence of oblong primary coils embedded underneath ground surface, along the vehicle path, can be independently excited by high frequency alternating current. The oscillating magnetic field of each primary coil is individually enabled when a Radio Frequency Identification (RFID) tag on board of the e-bike is detected and authenticated by an auxiliary coil laying close to that primary coil. On the e-bike, energy for the powertrain is harvested from the lane by a secondary coil that is installed around its rear wheel. When the e-bike is moving over inter-coil gaps, or anywhere away from the inductive lane, on-board power is sustained with the excess energy stored during transits over energized coils. Preliminary results from a prototyped module demonstrate the feasibility of the system, which could also be used by similarly adapted lightweight electric vehicles, such as rickshaws, electric wheel chairs and other electric personal mobility devices, favoring a new, low cost, sustainable urban modal variant.Research partially supported by grant SFRH/BD/52349/2013 from FCT, the Portuguese funding agency supporting science, technology and innovation, under the scope of the MIT-Portugal Program. L. A. Lisboa Cardoso and J. L. Afonso are with the Centro ALGORITMI, Department of Industrial Electronics, University of Minho, Campus de Azurém, 4800-058 Guimarães, Portugal (tel. 351-253-510183; e-mails: [email protected], [email protected]). M. Comesaña Martinez and A. A. Nogueiras Meléndez, are with the Department of Electronics Technology, University of Vigo, Vigo, Pontevedra 36310, Spain (e-mail: [email protected])

Aplicación de la política criminal en materia de homicidio en Cartagena.

In the present work will be addressed the application of criminal policy in the in the city of Cartagena in the matter of homicide, so as to carry out an analysis to determine whether or not the criminal policies in that territory are effective, based on the data provided COSED (Statistical diagnosis of crime in Cartagena de Indias) which is the entity responsible for the observation and monitoring of crime in Cartagena. With the above, we seek to study the problem, because in this way we will know the impact that the scourge of homicide has caused in the city and in this sense, we can know the strategies used to mitigate the crime so, possible solutions can be provided or suggestions to counteract the scourge of homicide that has scourged the city.En el presente trabajo se abordará la aplicación de la política criminal en la ciudad de Cartagena en materia de homicidio, para a partir de la realización de un análisis determinar si son o no eficaces las políticas criminales en dicho territorio, teniendo como fundamento los datos arrojados COSED (Diagnostico estadístico de delito en Cartagena de indias) que es la entidad encargada de la observación y seguimiento del delito en Cartagena. Con lo anterior, se busca estudiar la problemática, porque de esta manera conoceremos el impacto que ha causado el flagelo del homicidio en la ciudad y en este sentido, podremos conocer las estrategias que se utilizan para mitigar el delito así, se podrán brindar posibles soluciones o sugerencias para contrarrestar el flagelo del homicidio que tiene azotada a la ciudad

Circulation of Highly Drug-Resistant Clostridium difficile Ribotypes 027 and 001 in Two Tertiary-Care Hospitals in Mexico

© 2018, Mary Ann Liebert, Inc.OBJECTIVE: To assess drug susceptibility and characterize Clostridium difficile ribotypes in isolates from two tertiary-care hospitals in Mexico. METHODS: Isolates were evaluated for genotyping, antimicrobial susceptibility testing and detection of mutations associated with drug resistance. PCR ribotyping was performed using a combination of gel-based and capillary electrophoresis-based approaches. RESULTS: MIC50 and MIC90 were ≥128 mg/L for ciprofloxacin, erythromycin, clindamycin, and rifampicin. There was no reduced susceptibility to metronidazole or tetracycline; however, reduced susceptibility to vancomycin (≥4 mg/L) and fidaxomicin (≥2 mg/L) was detected in 50 (40.3%) and 4 (3.2%) isolates, respectively. Furthermore, the rpoB Arg505Lys mutation was more frequently detected in isolates with high minimum inhibitory concentration (MIC) to rifampicin (≥32 mg/L) (OR = 52.5; 95% CI = 5.17-532.6; p < 0.000). Of the 124 C. difficile isolates recovered, 84 (66.7%) were of ribotype 027, 18 (14.5%) of ribotype 001, and the remainder were other ribotypes (353, 255, 220, 208, 176, 106, 076, 020, 019, 017, 014, 012, 003, and 002). CONCLUSION: Ribotypes 027 and 001 were the most frequent C. difficile isolates recovered in this study, and demonstrated higher MICs. Furthermore, we found four isolates with reduced susceptibility to fidaxomicin, raising a concern since this drug is currently unavailable in Mexican Hospitals.Peer reviewedFinal Accepted Versio