Optimisation of Mobile Communication Networks - OMCO NET

The mini conference “Optimisation of Mobile Communication Networks” focuses on advanced methods for search and optimisation applied to wireless communication networks. It is sponsored by Research & Enterprise Fund Southampton Solent University. The conference strives to widen knowledge on advanced search methods capable of optimisation of wireless communications networks. The aim is to provide a forum for exchange of recent knowledge, new ideas and trends in this progressive and challenging area. The conference will popularise new successful approaches on resolving hard tasks such as minimisation of transmit power, cooperative and optimal routing

Base-promoted direct amidation of esters : beyond the current scope and practical applications

The base-promoted direct amidation of unactivated esters is among the most useful reactions for amide bond formation in contemporary organic chemistry. The intensive research in this area has led to the development of a number of new methods to achive this transformation. However, to date, the existing literature is more methodological and in many instances lacks practical directions. Therefore, the full potential of this transformation is yet to be revealed by broadening the substrate scope. In a search for new practical applications of the amidation reaction, herein we present a comprehensive study of a number of base-promoted direct amidations that encompass a wide range of amines and esters. Furthermore, we applied our findings in the synthesis of phosphoramidates and several industrially relevant products.peerReviewe

Electrical characterization of Si doped AlN films synthesized by pulsed laser deposition

The electrical properties of thin AlN films doped with Si (AlN:Si) have been investigated. The films were synthesized on Si substrates at 800 °C by pulsed laser deposition in low-pressure nitrogen ambient. The AlN:Si films exhibit non-ohmic I-V characteristics and the current through these films is controlled by space charge limited current. The C-V dependence of metal-insulator-silicon (MIS) structures with AlN:Si films exhibits an excess capacitance around zero bias voltage. This excess capacitance indicates the presence of deep acceptor levels situated at the boundaries of adjacent grains in the AlN:Si films. The Si donor density in the AlN:Si films, estimated from the 1 MHz C-V characteristics, is of the order of 1018 cm−3. The impedance measurements of these AlN:Si structures at different test voltage frequencies reveal that the charge transport mechanism is dominated by either thermally-activated hopping or electron tunneling from occupied to nearest unoccupied deep levels

Multicentric survey of patient doses in fluoroscopy guided diagnostic and interventional cardiac procedures: comparison with Diagnostic Reference Levels and follow-up levels for patients at risk for radiation induced skin effects

Въведение. Интервенционалните кардиологични процедури, често са свързани с голямо облъчване на пациентите, поради което изискват специално внимание по отношение на защитата от появата на радиационно индуцирани ефекти при пациента.Материали и методи. Проучването на типичните стойности на дозата е проведено ретроспективно, в девет лечебни заведения, с общо четиринадесет ангиографски уредби. За две от най-често извършваните процедури - перкутанна коронарна интервенция (PCI) и коронарна артериография (CA) са изчислени типичните стойности на величините произведение керма-площ (КАП), кумулативна доза (КД) и време на скопия (ВС) и са сравнени с актуалните Национални диагностични референтни нива (НДРН) за България. Извършен е анализ на данните по отношение на риска от възникване на кожно индуцирани ефекти, вследствие на интервенционалните кардиологични процедури.Цел. 1) да се представят и анализират типичните стойности на величината КАП за най-често провежданите кардиологични процедури - перкутанна коронарна интервенция и коронарна артериография в кардиологични отделения с голяма работна натовареност и да се сравнят с НДРН; 2) да се сравнят дозите на пациентите с публикуваните в Наредба 2 нива за проследяване, за установяване на пациенти с риск за възникване на радиационно индуцирани ефекти.Резултати. Резултатите показват, че типични стойности на изследваните величини за PCI и CA при някои от уредбите, са по-високи от НДРН. Във всяко от разглежданите лечебни заведения има пациенти с поне едно превишено ниво за проследяване за процедура PCI.Изводи. Резултатите показват потенциал за оптимизиране, както на работата в отделенията с високи типични стойности на дозата, така и при уредбите с много ниски типични стойности на изследваните величини. При проследените пациенти не се наблюдават оплаквания и поява на радиационно индуциран ефект. Изготвянето и въвеждането в рутинната клинична практика на процедури за рутинно прилагане на „Инструкцията за пациента след проведена интервенционална/и процедура/и с по-голяма степен на сложност и дълго време на скопия“ ще позволи навременна диагностика и навременно лечение на кожните ефекти в следствие на проведените кардиологични процедури под рентгенов контрол. Introduction. Interventional cardiac procedures are often associated with high patient exposure and therefore require special care in protecting patients from radiation-induced effects.Materials and methods. A retrospective study of typical patients’doses was performed in nine hospitals, with a total number of fourteen angiography systems. The typical values for kerma-area product (KAP), cumulative dose (CD) and fluoroscopy time (FT) for two of the most commonly performed procedures - percutaneous coronary intervention (PCI) and coronary arteriography (CA), were calculated and compared with the Bulgarian National Diagnostic Reference Levels (NDRL). Data analysis, regarding the risk of radiation-induced skin effects due to interventional cardiac procedures, was performed.Aim. 1) to present and analyze the typical KAP values for PCI and CA procedures in cardiology departments with high workload and to compare them with the NDRL; 2) to compare the patient doses with the follow-up levels published in Ordinance 2, to identify patients at risk for radiation-induced effects.Results. The results show that typical values for PCI and CA procedures for some of the angiography systems are higher than the NDRL. In all investigated departments there are patients with at least one exceeded follow-up level for PCI.Conclusions. The results show a potential for optimization in the departments with both high or very low typical dose or FT values. No radiation-induced effect was observed in the followed-up group of patients. The introduction of procedure with "Instruction to the patient after an interventional cardiac procedure(s) with greater complexity and a long fluoroscopy time" for patient follow-up and its regular implementation into the routine clinical practice will help for timely diagnosis and treatment of radiation-induced skin effects after cardiac procedures under fluoroscopy control