Mathematical Modeling and Simulation of Radial Temperature Profile of Strontium Bromide Lasers

For metal and metal halide vapor lasers excited by high frequency pulsed discharge, the thermal effect mainly caused by the radial temperature distribution is of considerable importance for stable laser operation and improvement of laser output characteristics. A short survey of the obtained analytical and numerical-analytical mathematical models of the temperature profile in a high-powered He-SrBr2 laser is presented. The models are described by the steady-state heat conduction equation with mixed type nonlinear boundary conditions for the arbitrary form of the volume power density. A complete model of radial heat flow between the two tubes is established for precise calculating the inner wall temperature. The models are applied for simulating temperature profiles for newly designed laser. The author’s software prototype LasSim is used for carrying out the mathematical models and simulations

Application of MARS for the Construction of Nonparametric Models

2000 Mathematics Subject Classification: 62G08, 62P30.This paper presents the main features of the relatively new statistical technique called Multivariate Adaptive Regression Splines (MARS) and the corresponding software product. The MARS method is designed for statistical analysis of data, when standard parametric modeling by multiple regression or logistic regression methods is not applicable. A case study from the area of laser technology, especially for modeling of UV Cu+ Ne-CuBr laser is performed. The obtained results are in a good agreement with practical issues. It is shown that the constructed nonparametric MARS models can be applied in estimation and prediction of current and future experiments in order to improve the output laser power.This paper is partially supported by projects VU-MI-205, NSF of the Bulgarian Ministry of Education, Youth and Science and RS09–FMI–013, ISM-4 of NPD, Plovdiv University “Paisii Hilendarski”

Using the Business Process Execution Language for Managing Scientific Processes

This paper describes the use of the Business Process Execution Language for Web Services (BPEL4WS/BPEL) for managing scientific workflows. This work is result of our attempt to adopt Service Oriented Architecture in order to perform Web services – based simulation of metal vapor lasers. Scientific workflows can be more demanding in their requirements than business processes. In the context of addressing these requirements, the features of the BPEL4WS specification are discussed, which is widely regarded as the de-facto standard for orchestrating Web services for business workflows. A typical use case of calculation the electric field potential and intensity distributions is discussed as an example of building a BPEL process to perform distributed simulation constructed by loosely-coupled services

SELF-CONFIDENCE AND REALIZATION OF FEMALE STUDENTS FROM THE FIRST YEAR OF TRAKIA UNIVERSITY- STARA ZAGORA REGARDING PHYSICAL DISABILITY

The research used a survey method at the level of "entry" and repetition after the first semester. The results are presented in a graphical format and a comparative analysis is made. The main factors for the frequent discrepancy between the self-assessment at the beginning of the studies and after the expiration of only one semester are indicated

Laparoscopic nephropexy: Treatment outcome and quality of life

INTRODUCTION: Surgical treatment of nephroptosis is rarely performed nowаdays and is done only in symptomatic patients. Here we present the results of our laparoscopic nephropexy in patients with symp­tomatic nephroptosis.MATERIALS AND METHODS: For a period from March 2014 to March 2015, a total of 8 women at an av­erage age of 54 years were operated on in our clinic . Four of the patients were with nephroptosis of the left kidney, three of the right one and one had bilateral nephroptosis. Most of the patients complained of pain and discomfort in active movement, only one individual had complaints consisting of intermittent macro­scopic hematuria. One patient had been operated on in the past by a classic open method of the same kidney. Preoperatively, for all patients, intravenous urography in supine and standing position was performed. All patients were operated on trans-peritoneally through 3 ports: 1x10 mm and 2x5 mm. The kidney was com­pletely mobilized and kidney fat was dissected. The upper and middle pole of the kidney were fixed to mus­culus psoas major, using a single non-absorbable suture and intracorporeal technique for tying.RESULT: All operations were performed with minimal blood loss, an average operating time of 45 minutes and a hospital stay of 4 days. No conversion was required in any of the cases. Postoperatively, patients were tracked and monitored by ultrasound examination. At 3 months we did IVP, which showed the correct loca­tion of the kidney. All patients remained asymptomatic for an average of 11 months after surgery.CONCLUSION: Laparoscopic transperitoneal nephropexy is a safe and effective procedure and a promising method for correction of symptomatic nephroptosis

Взгляд методиста на: Сергей Влахов, Нов руско-български речник / Новый русско-болгарский словарь. Под редакцией Анны Липовской

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Case report: Robot-assisted partial nephrectomy of renal metastasis from breast cancer with Da Vinci Xi

Breast cancer is the second most common type of cancer among women, leading to death. Predominantly this type of cancer spreads into lungs, bones, liver, and brain. Kidney involvement is rare. We present a case of breast cancer metastasizing to the kidney. The patient is a 53-year-old woman, who has undergone a right mastectomy, including axillar lymph node dissection at the age of 49. After four years of follow-up, a CT scan revealed a renal mass on the left kidney.  A robot-assisted partial nephrectomy with Da Vinci Xi surgical system was done and the histology report showed metastasis from breast cancer

An 18-kg giant variant of a well-differentiated retroperitoneal liposarcoma of the kidney

Well-differentiated liposarcoma (WDLS), the most common type of liposarcoma is a slow growing, painless tumor usually located in the retroperitoneum or the limbs.In this abstract we present a case of a 71-year-old male who presented in our clinic with a diagnosis of a giant WDLS. We performed a CT scan from which we found a giant abdominopelvic mass originating from the right kidney. This mass was pushing almost all organs and structures from the right abdominal cavity across the midline to the left side, which includes the IVC, aorta and the right ureter, all bowels were also pushed and were above this mass. A large 18-kg fibro-fatty mass was extirpated. The histopathological findings reported low-grade differentiated liposarcoma. The CT scan, which was done 3 months after the operation, determined that the patient was free from recurrence

USE OF INNOVATIVE METHODS IN THE TEACHING OF PHYSICAL EDUCATION AT TRAKIA UNIVERSITY-STARA ZAGORA AND THE PRACTICE OF RUGBY

Innovative methods represent new approaches to teaching and learning in all disciplines of higher education. Until now, they have remained largely isolated in sports activities in higher schools. A set of methods is presented, with the aim of better feedback between participants in the educational process, strengthening interest and increasing motivation to participate in classes. The contribution of innovations in the development of the thinking of female students is assessed. Conclusions are made about the place of innovative approaches in education