Intravascular ultrasound assessment of blood vessel morphology

Intravascular ultrasound (IVUS) is an invasive imaging technique, characterized by the ability to depict the tomographic section of blood vessels’ lumen and wall. Thus, it enables the performance of a unique in-vivo assessment of the luminal area and three-layer wall morphology, as well as atherosclerosis within the vessel. The typical composition of an IVUS image and the measurements of observed structures have been shown to correlate well with histology and angioscopy in several in vitro studies. The existing data on intravascular imaging of the aorta are scant. In this study, the preliminary results of in-vitro IVUS examination of human descending aorta morphology are presented, with reference to the corresponding histological section

Sciatic nerve variations in some studies on the Polish population and its statistical significance

The purpose of the study was to describe and analyse sciatic nerve variation in a relatively small, yet statistically significant, group. Consequently, a comparison of described variation to that known from former studies was performed. Additionally, we estimated the minimum group necessary for a statistical confirmation of hypothetical differences in sciatic nerve topography between the studies

Polysplenia and other anatomical variants of the spleen

The anatomy, physiology and embryology of the spleen are essential fields of study for the determination of congenital varieties as well as the pathological processes occurring in this organ.The aim of this study is to summarize the current knowledge on the proper development of the spleen and to present structural variants that may be of clinical significance or be important from the radiologist's point of view.Structural changes of the spleen may result in non-specific clinical symptoms, which may confuse an inexperienced physician. Inaccurate diagnosis and late diagnosis have various negative, often even fatal, consequences. In order to make an appropriate diagnosis, and thus help the patient in a timely manner, it is necessary to have extensive knowledge about the variants of the structure of the spleen. Knowledge of anatomical variations is essential for the development of a differential diagnosis, which enables the correct diagnosis to be made

Team web calendar

Praca obejmuje opis aplikacji internetowej stworzonej na potrzeby pracownikow Zakładu Inżynierii Nowych MateriałówThis paper is a description of the web application, which was made for employees of Zakład Inżynierii Nowych Materiałów

Analysis of the use of waste heat from a glass melting furnace for electricity production in the organic Rankine cycle system

In most production plants, waste heat is usually discharged into the environment, contributing to a reduction in the energy efficiency of industrial processes. This is often due to the low thermal parameters of the carriers in which this energy is contained, such as oils, water, exhaust gases or other post-process gases, which means that their use for electricity production in a conventional Rankine cycle may prove to be economically unprofitable. One of the technologies enabling the use of lowand medium-temperature waste heat carriers is the organic Rankine cycle (ORC) technology. The paper present results of calculations performed to evaluate potential electricity production in ORC using waste heat from a natural gas-fired glass melting furnace. The analysis was carried out assuming the use of a single-stage axial turbine, whose efficiency was estimated using correlations available in the literature. The calculations were carried out for three working fluids, namely hexamethyldisiloxane, dimethyl carbonate, and toluene for two scenarios, i.e. ORC system dedicated only to electricity production and ORC system working in cogeneration mode, where heat is obtain from cooling the condenser. In each of the considered cases, the ORC system achieves the net power output exceeding 300 kW (309 kW for megawatts in the cogenerative mode to 367 kW for toluene in the non-cogenerative mode), with an estimated turbine efficiency above 80%, in range of 80,75 to 83,78%. The efficiency of the ORC system, depending on the used working fluid and the adopted scenario, is in the range from 14.85 to 16.68%, achieving higher efficiency for the non-cogenerative work scenario

Czerniaki złośliwe regionu głowy i szyi w materiale Kliniki Chirurgii Onkologicznej i Rekonstrukcyjnej Centrum Onkologii IMSC w Gliwicach

Introduction: About 25% of melanomas are localized in head and neck skin, and this particular localization is most difficult to treat, and the prognosis is less favorable. The depth of melanoma infiltration (Clark and Breslau grade) into the skin is the main factor of local advancement of the disease. Surgical treatment is an essential therapeutic modality in patients with melanoma. Aim: The aim of this study was to evaluate results of our surgical treatment of melanomas in head and neck localisation, treated from 1997 to 2007 in Department of Oncological and Reconstructive Surgery in Center of Oncology IMSC in Gliwice. Material: We analysed group of 47 patients (aged 26 to 75 years, mean 49), treated by surgical excision of malignant melanoma in the head and neck region. Most of the patiens required to use free fl aps or skin graft technique to close posexcisional defect, on basis of clinical considerations. Results: The 5-year total survival for all patients was 62% and were dependent on depht of melanoma infiltration and regional lymph node metastasis. The significant prognostic factors were: localization of primary focus, local progression of disease, free microscopical excision margins sex and age. Conclusions: Prognosis in the patients with melanoma of the head and neck is unreliable and dependent on local advancement of disease and localization of primary focus. Surgical treatment is an essential therapeutic modality in patients with melanoma. Adiuvant radiotherapy after surgical treatment of melanoma of the head and neck is intended for the patiens with high risk of local or regional recurence of disease

The utilization of the mesoporous Ti-SBA-15 catalyst in the epoxidation of allyl alcohol to glycidol and diglycidyl ether in the water medium

This work presents the studies on the optimization the process of allyl alcohol epoxidation over the Ti-SBA-15 catalyst. The optimization was carried out in an aqueous medium, wherein water was introduced into the reaction medium with an oxidizing agent (30 wt% aqueous solution of hydrogen peroxide) and it was formed in the reaction medium during the processes. The main investigated technological parameters were: the temperature, the molar ratio of allyl alcohol/hydrogen peroxide, the catalyst content and the reaction time. The main functions the process were: the selectivity of transformation to glycidol in relation to allyl alcohol consumed, the selectivity of transformation to diglycidyl ether in relation to allyl alcohol consumed, the conversion of allyl alcohol and the selectivity of transformation to organic compounds in relation to hydrogen peroxide consumed. The analysis of the layer drawings showed that in water solution it is best to conduct allyl alcohol epoxidation in direction of glycidol (selectivity of glycidol 54 mol%) at: the temperature of 10–17°C, the molar ratio of reactants 0.5–1.9, the catalyst content 2.9–4.0 wt%, the reaction time 2.7–3.0 h and in direction of diglycidyl ether (selectivity of diglycidyl ether 16 mol%) at: the temperature of 18–33°C, the molar ratio of reactants 0.9–1.65, the catalyst content 2.0–3.4 wt%, the reaction time 1.7–2.6 h. The presented method allows to obtain two very valuable intermediates for the organic industry