Small but long koch fractal monopole

A small but long wire fractal antenna based on the Koch curve is presented. Experimental and numerical results show that the antenna improves the features of a common linear monopole. The radiation resistance is increased and the Q is reduced at each fractal iteration, approaching the fundamental limit on small antennas.Peer ReviewedPostprint (published version

An ab initio analytical potential energy surface for the O(3P) + CS(X1Σ+) → CO(X1Σ+) + S(3P) reaction useful for kinetic and dynamical studies

The N(4Su) + NO(X 2Π) → N 2(X 1Σg+) + O( 3Pg) reaction plays an important role in the upper atmosphere chemistry and as a calibration system for discharge flow systems. Surprisingly, very little theoretical and experimental work has been devoted to the characterization of the dynamical features of this system. In this work a Sorbie-Murrell expression for the lowest 3A″ potential energy surface (PES) connecting reactants in their ground electronic states based upon the fitting of an accurate ab initio CI grid of points has been derived. The PES fitted shows no barrier to reaction with respect to the reactants asymptote in accordance with experimental findings and becomes highly repulsive as the NNO angle is varied away from the saddle point geometry. The results of preliminary quasiclassical trajectory calculations on this surface reproduce very well the experimental energy disposal in products, even though the vibrational distribution derived from trajectories seems to be a bit cooler than the experimental data. Moreover, thermal rate constants derived from trajectories are in excellent accordance with experimental value

An analytical representation of the ground potential energy surface (2A') of the H + Cl2 → HCl + Cl and Cl + HCl → HCl + Cl reactions, based on ab initio calculations

In this work we have studied at an ab initio level the lowest 2A′ potential energy surface (PES) of the HCl2 system. This PES is involved in the H(2S)+Cl2(X 1Σ+g)→HCl(X 1Σ+)+Cl(2P) and Cl(2P)+HCl(X 1Σ+)→HCl(X 1Σ+)+Cl(2P) gas phase elementary chemical reactions. The former reaction is an important chemical laser while the second one is the most frequently used prototype of heavy-light-heavy reaction. A large number of points on the 2A′ PES have been calculated at the PUMP2/6-311G(3d2 f,3p2d) ab initio level. The ab initio calculations show the existence of two angular transition states with negligible or very small barriers to collinearity. This and other properties of the PES are in agreement with previous studies. An analytical expression based on a many-body expansion has been used to obtain a satisfactory fit of the 740 ab initio points calculated, with a root-mean-square deviation within the range of the estimated ab initio method error margin. This analytical representation of the 2A′ PES has been used to evaluate the variational transition state theory thermal rate constants of the above-mentioned reactions, including also the Cl+DCl reaction, and quite good agreement has been obtained when comparing with experimental results. The analytical PES obtained in this work is suitable for use in studies on the kinetics and dynamics of the HCl2 system

Twelve tips for designing and implementing an academic coaching program

Coaching has become increasingly popular as a mechanism to support learning across the health professions education (HPE) continuum. While there is a growing body of literature in this area, there is minimal guidance related to the design and implementation of academic coaching in health professional courses. This paper seeks to contribute to this literature by presenting guidance for academic developers who are considering introducing academic coaching into a health professional course. The 12 tips are based on the authors’ collective experiences of designing and implementing academic coaching in university medical courses in Australia and the UK. Although focused on medical education, this paper is intended to have applicability across the health professions, and potentially across university and postgraduate training contexts. Together, the tips offer a strategic and operational framework to guide the design and implementation of academic coaching initiatives in health professions education.The author(s) reported there is no funding associated with the work featured in this article

Renal brucelloma: A case report

Descripción del caso clínico: Paciente en contacto habitual con ganado ovino y bovino, astenia, anemia y fiebre de origen desconocido. En este contexto se realizan varias pruebas complementarias, entre ellas un TC abdominal que revela masa renal calcificada. Con la sospecha de brucelosis, tras obtenerse un resultado positivo en Rosa de Bengala, se comienza tratamiento antibiótico y se realiza nefrectomía simple derecha por lumbotomía, la pieza quirúrgica confirmó el diagnóstico con PCR positiva para Brucella Melitensis. Relevancia: Existen muy pocos casos de bruceloma renal descritos en la literatura, por ello, es importante divulgar los casos que surjan para ampliar el conocimiento sobre esta patología y su tratamiento. Implicaciones clínicas: En ocasiones las pruebas no invasivas no son suficientes para su diagnóstico y el tratamiento quirúrgico junto con la antibioterapia es de elección en la mayoría de los casos descritos en la literatura. Conclusiones: La brucelosis es una enfermedad poco frecuente pero endémica en algunas zonas. El diagnóstico suele darse en el contexto de un estudio por fiebre de origen desconocido. El tratamiento del bruceloma renal suele ser la combinación de antibioterapia y cirugía. Clinical case description: A patient in regular contact with cattle and sheep presented with asthenia, anemia, and fever of unknown origin. Among the complementary studies carried out, an abdominal CT scan revealed a calcified renal mass. Brucellosis was suspected, and after a positive Bengal Rose test, antibiotic therapy was begun. Right nephrectomy was performed through lumbotomy and the diagnosis was confirmed by the surgical specimen, with a PCR test positive for Brucella melitensis. Relevance: There are very few cases of renal brucelloma reported in the literature, thus the description of cases that arise is important to broaden the knowledge of the pathology and its treatment. Clinical implications: Noninvasive tests are often not sufficient for making the diagnosis. The surgical approach, together with antibiotic therapy, is the treatment of choice in the majority of the cases reported in the literature. Conclusions: Brucellosis is an uncommon disease, but endemic in certain areas. Diagnosis tends to be made in the context of evaluating cases of fever of unknown origin. The combination of antibiotic therapy and surgery is the usual treatment for renal brucelloma

Acquisition of motion events in L2 Spanish by German, French and Italian speakers

This article explores the second language acquisition of motion events, with particular regard to cross-linguistic influence between first and second languages. Oral narratives in Spanish as a second language by native speakers of French, German and Italian are compared, together with narratives by native Spanish speakers. Previous analysis on the expression of motion events in these languages showed that Romance languages do not always follow the same pattern; for example, Italian tends to express the component of Path more frequently than French and Spanish. The results of the present study highlight evidence of intra-typological differences, even between languages that are genetically very close. These differences seem to lead speakers to produce cases of conceptual transfer into their second language, Spanish, even when their first language is another Romance language

La infección del tracto urinario como causa principal de ingreso en pacientes cistectomizados

Introducción y objetivos La cistectomía radical con derivación urinaria asociada a linfadenectomía pélvica ampliada continúa siendo el tratamiento de elección en el cáncer vesical musculoinvasivo. Un 64% de los pacientes presentan complicaciones postoperatorias, siendo la infección urinaria responsable en un 20-40% de los casos. El objetivo del presente proyecto es valorar la tasa de infección urinaria como causa de reingreso tras cistectomía, e identificar factores protectores y predisponentes de infección urinaria en nuestro medio. Por último, conocer los resultados obtenidos al aplicar el protocolo de profilaxis antibiótica tras la retirada de los catéteres ureterales. Material y métodos Estudio descriptivo retrospectivo de pacientes cistectomizados en el Servicio de Urología del Hospital Clínico Universitario desde enero de 2012 hasta diciembre de 2018. Desde octubre de 2017, de forma estandarizada, a todo paciente se le aplica un protocolo de prevención de infección del tracto urinario (ITU) tras la retirada de catéteres. Resultados La ITU es responsable del 54, 7% de los reingresos, siendo un 55, 1% de estos por causa de una ITU tras la retirada de los catéteres ureterales. El 9, 5% de los pacientes con profilaxis presenta ITU tras la retirada, frente a un 10, 6% en el grupo de pacientes sin profilaxis. El paciente que reingresa por ITU tras la retirada tiene un tiempo de catéteres medio de 24, 3 ± 7, 2 días, frente a los 24, 5 ± 7, 4 días en el grupo sin ITU (p = 0, 847). Conclusiones El tipo de derivación urinaria empleada no guarda relación con la tasa de infección urinaria. El modelo de regresión no identifica la profilaxis antibiótica, ni tampoco el tiempo de catéteres, como factores independientes de ITU tras la retirada de los catéteres. Introduction and objectives: Radical cystectomy with urinary diversion associated with extended pelvic lymphadenectomy continues to be the treatment of choice in muscle invasive bladder cancer. Sixty-four percent of patients submitted to this procedure present postoperative complications, with urinary infection being responsible in 20-40% of cases. The aim of this project is to assess the rate of urinary infection as a cause of re-admission after cystectomy, and to identify protective and predisposing factors for urinary infection in our environment. Finally, we will evaluate the outcomes after the establishment of a prophylactic antibiotic protocol after removal of ureteral catheters. Material and methods: Retrospective descriptive study of cystectomized patients in the Urology Service of the Hospital Clínico Universitario of Zaragoza, from January 2012 to December 2018. A urinary tract infection (UTI) prevention protocol after catheter removal is established for all patients since October 2017. Results: UTI is responsible for 54.7% of readmissions, with 55.1% of these being due to UTI after removal of ureteral catheters. Of the patients who received with prophylaxis, 9.5% presented UTIs after withdrawal, compared to 10.6% in the group of patients without prophylaxis. The patient who is re-admitted for UTI after withdrawal has a mean catheter time of 24.3 ± 7.2 days, compared to 24.5 ± 7.4 days for patients in the group without UTI (P =.847). Conclusions: The type of urinary diversion performed is not related to the rate of urinary infection. The regression model does not identify antibiotic prophylaxis, nor catheter time, as independent factors of UTI after catheter removal

Metástasis testicular asincrónica de carcinoma urotelial vesical musculo invasivo

El carcinoma vesical músculo invasivo de estirpe urotelial presenta una alta probabilidad de producir metástasis, siendo los órganos más frecuentes el pulmón, hueso e hígado. Las metástasis de carcinoma urotelial de vejiga en el testículo son excepcionales. Los tumores primarios que metastatizan en testiculo son la leucemia, el prostático, el pulmonar, el melanoma y los de origen digestivo. Presentamos un caso de metástasis asincrónica de carcinoma urotelial en el testículo derecho. Las metástasis testiculares deben considerarse como un posible diagnóstico diferencial de masa gonadal en el caso de existir antecedentes de un tumor vesical musculo invasivo (TVMI). Urothelial muscle-invasive bladder carcinoma has a high probability of producing metastases, and does so most frequently to the lung, bone, and liver. Urothelial bladder carcinoma metastases to the testes are rare. The primary tumors that metastasize to the testes are leukemia, prostate cancer, lung cancer, melanoma, and gastrointestinal tumors. We present herein a case of asynchronous metastasis of urothelial carcinoma to the right testis. Testicular metastases should be considered in the differential diagnosis of a gonadal mass, when there is a history of muscle-invasive bladder cancer

Small but long koch fractal monopole

A small but long wire fractal antenna based on the Koch curve is presented. Experimental and numerical results show that the antenna improves the features of a common linear monopole. The radiation resistance is increased and the Q is reduced at each fractal iteration, approaching the fundamental limit on small antennas.Peer Reviewe