Application of the support vector machine for processing the results of tin ores enrichment by the centrifugal concentration method

The relevance of the research is due to the acquisition of new knowledge about the features of the applicability of the support vector machine, related to machine learning tools, for solving problems of mathematical modeling of mining and processing equipment. The purpose of the research is a statistical analysis of the results of semi-industrial tests of the Knelson CVD technology on tin raw materials using the support vector machine method and the development of mathematical models suitable for further optimization of the technological parameters of the equipment. The objects of research were the products obtained as a result of the operation of hydro-cyclones, as well as the technological parameters of the operation of centrifugal concentrators. The work uses classical methods of mathematical statistics, the least squares method for constructing a linear regression model, the support vector machine implemented on the basis of the Scikit-learn library, as well as the method of verifying the resulting models based on the ShuffleSplit library. A general description of the process of testing the Knelson concentrator with continuous controlled unloading in relation to the enrichment of tin ores is presented. The results obtained were processed using the support vector machine. Regression models are obtained in the form of polynomials of the second degree and in the form of radial basis functions. A significant non-linearity is shown in the dependence between the content of the valuable component in the tailings and the values of the technological parameters of the apparatus

СВОЙСТВА ДИФЕНИЛ–2;2';4;4'–ТЕТРААМИНА И ТОНКОПЛЕНОЧНАЯ МИШЕНЬ ПИРОЭЛЕКТРИЧЕСКОГО ЭЛЕКТРОННО–ОПТИЧЕСКОГО ПРЕОБРАЗОВАТЕЛЯ НА ЕГО ОСНОВЕ

Methods and  results of studying diphenyl−2,2’,4,4’−tetraamine surface morphology and  structure obtained during  making the thin−film target of the Pyroelectric Thermal Image Transducer have been described. Quatum−chemical simulation  (HF/MP2,  cc−pVDZ base) of diphenyl−2,2’,4,4’−tetraamine (DPhTA) properties allows making conclusions on the nature of the pyroelectric properties of this polycrystalline material, since the hydrogen bonds between polycrystalline molecules are weaker than the intramolecular bonds.The  research techniques were  X−ray  diffraction  analysis, optical  microscopy in polarized light, scanning electron microscopy, Fourier−transform IR spectroscopy, surface charge measurements of pyroelectric sample during  heating with the  use  of synchronous detection, testing of Pyroelectric Thermal  Image  Transducer targets on purpose−made high−vacuum technology equipment.The methods of making  pyroelectric targets have  been described.We have  manufactured the  Pyroelectric Thermal  Image  Transducer (λ =  8–14  microns, 18 mm diam.  target, 640х480 pixels) based on DPhTA in a metalloceramic case with a compact infrared imager having a resolution to 320х240 and a temperature sensitivity about 0.2 К in panning mode.Описаны методы и результаты исследования структуры и морфологии поверхности дифенил−2,2',4,4'−тетраамина, полученные при создании тонкопленочной мишени пироэлектрического электронно−оптического преобразователя (пироЭОПа). Квантово−химическое моделирование (HF/MP2, базис cc−pVDZ) свойств единичной молекулы  дифенил−2,2',4,4'− тетраамина (ДФТА) позволяет сделать выводы о природе пироэлектрических свойств поликристаллов этого материала, так как водородные связи между молекулами в поликристалле слабее внутримолекулярных связей. Исследования проведены методами рентгено−структрного анализа, оптической микроскопии в поляризованном свете, растровой электронной микро скопии,  ИК−Фурье−спектроскопии, измерения поверхностного заряда пироэлектрического образца при нагреве с использованием принципа синхронного детектирования, испытания образцов мишеней пироЭПОв   на специально изготовленной высоковакуумной установке. Описаны методы изготовления пироэлектрической мишени. Изготовлены действующие образцы пироЭОПов на основе ДФТА (λ = 8÷14 мкм, мишень диаметром 18 мм, число чувствительных элементов 640 × 480) в металлокерамическом корпусе и компактного тепловизора с разрешением до 320 × 240 и температурной чувствительностью ~0,2  К в режиме панорамирования

Surgical Treatment of Decompensated Cicatricial Stricture of the Esophagus, Grade III-IV Dysphagia, and Compression Syndrome Caused by Nontoxic Multinodular Goiter: A Case Report

Objective: Long-standing gastroesophageal reflux disease is the most common cause of a cicatricial stricture of the esophagus. The treatment of this pathology involves a wide range of methods including conservative and surgical options. Surgeons can encounter technical difficulties in case of concomitant neck and chest pathology.Clinical case: We report a case of a decompensated cicatricial stricture of the esophagus with concomitant paraesophageal hiatal hernia, refractory gastroesophageal reflux disease, and nontoxic multinodular goiter (166.9 cm3). Selecting the optimal management for such patients is often a challenge. Staged treatment significantly improves postoperative quality of life, but the increased length of hospital stay can negatively impact patient compliance

Clinical case of combined eye injury: penetrating corneoscleral wound with concussion of the third degree. Advanced surgical approach to treatment

The purpose of the study is to present a clinical case of severe combined injury of the eyeball: penetrating corneoscleral injury, concussion of the III degree, as well as an advanced surgical approach to the treatment of this pathology.Цель исследования – представить клинический случай комбинированной травмы глазного яблока: проникающее корнеосклеральное ранение, контузия III степени, а также расширенный хирургический подход к лечению данной патологии

СВЯЗЬ ВНУТРИБРЮШНОГО ДАВЛЕНИЯ И РАНЕВОЙ ИНФЕКЦИИ В ПОСЛЕОПЕРАЦИОННОМ ПЕРИОДЕ У РОДИЛЬНИЦ С ОЖИРЕНИЕМ

To study the dependence of the wound infection rate after cesarean section and the level of postoperative intra-abdominal pressure (IAP) in obese patients. A study was conducted, involving 313 patients delivered by cesarean section. All patients were divided into 4 groups: control group 90, with degree I obesity 137, with II 49 and III 37 patients. The frequency of development of wound postoperative complications was determined, bacteriological studies of amniotic fluid, placenta, lousy and discharge wound of the anterior abdominal wall were carried out. Postoperative dynamics of IAP was investigated. IAP research was carried out using vesical indirect method. Wound postoperative complications were diagnosed in 17,9% of the puerperas, 8,6% of them had a discrepancy and suppuration of the sutures in the anterior abdominal wall. The incidence of wound complications increased with increasing severity of obesity. In patients with severe obesity, in the sowing of septic purulent wounds, microorganisms of the genus Escherichia coli, Enterococcus spp. prevailed. Analysis of postoperative dynamics of IAP showed that in obese patients its values exceeded those in the control group at all stages of the study. The correlation analysis showed the presence of a positive average force of communication between the postoperative intestinal paresis and the development of wound infection, r = 0,500 (p < 0,01). The relationship between wound infection and postoperative dynamics of IAP was approaching a strong-r ratio of 0,654 (p<0,001). Representatives of the intestinal microbioma are leading in patients with obesity in infection of the postoperative wound. In the contamination of the intestinal microflora, intra-abdominal hypertension (IAH) is one of the main triggers. Long-term persistent IAH in the postoperative period is a significant risk factor for the development of postoperative infectious complications.По данным ряда популяционных исследований, у родильниц с ожирением частота послеоперационных инфекционных осложнений в несколько раз выше по сравнению с пациентками, имеющими нормальную массу тела. Основной целью данного исследования является изучение зависимости частоты раневой инфекции после кесарева сечения и уровня послеоперационного внутрибрюшного давления (ВБД) у пациенток с ожирением. В исследовании участвовало 313 пациенток, родоразрешенных путем кесарева сечения. Выделено 4 группы: контрольная группа – 90 пациенток, со I степенью ожирения 137, с II 49 и III 37 пациенток. Определена частота развития раневых послеоперационных осложнений, проведены бактериологические исследования амниотической жидкости, плаценты, лохий и отделяемого раны передней брюшной стенки. Исследована послеоперационная динамика ВБД чреспузырным методом. Раневые осложнения диагностированы у 17,9% родильниц, из них у 8,6% – расхождение и нагноение швов на передней брюшной стенке. Частота раневых осложнений возрастала с увеличением тяжести ожирения. У пациенток с выраженным ожирением при посеве отделяемого гнойных ран преобладали микроорганизмы рода Escherichia coli и Enterococcus spp. Анализ послеоперационной динамики ВБД показал, что при общей тенденции снижения уровня ВБД в группах, при ожирении его значения превышали таковой в группе контроля на всех этапах исследования. Была выявлена корреляционная связь средней силы между развитием раневой инфекции и послеоперационным парезом кишечника – r = 0,500 (p < 0,01), а также уровнем снижения послеоперационного ВБД – r = -0,481 (p < 0,01). Связь инфицирования раны (рост микроорганизмов из отделяемого раны при посеве на среды) и послеоперационной динамики ВБД приближалась к сильной – r составил 0,654 (p < 0,001). Таким образом, в инфицировании послеоперационной раны у пациенток с ожирением лидируют представители кишечного микробиома. В контаминации кишечной микрофлоры внутрибрюшная гипертензия (ВБГ) является одним из основных триггеров. Длительно сохраняющаяся ВБГ в послеоперационном периоде является значимым фактором риска для развития послеоперационных инфекционных осложнений.

A case report of surgical treatment of amiodarone-induced thyrotoxicosis in a patient with multiple organ failure

Amiodarone is a drug used in the treatment of life-threatening arrhythmias, which can lead to the development of amiodarone-induced thyrotoxicosis. In most cases this pathology can be treated by conservative methods; surgical treatment is resorted to in cases of thyrotoxicosis refractory to medical treatment. This case report describes surgical treatment of a patient with amiodarone-induced thyrotoxicosis, progressive heart failure, neurological pathology, bilateral pneumonia, functioning tracheostomy, systemic infectious process, multiple organ dysfunction syndrome, who was treated in the intensive care unit. Due to the lack of response to therapy with antithyroid drugs (thiamazole, lithium preparations and pulse therapy with prednisolone) and a progressive deterioration of the condition in a short period of time, according to vital indicators, the patient underwent thyroidectomy. In the postoperative period, there was a decrease in the occurrence of chronic heart failure symptoms. Medical control of cardiac arrhythmias was achieved. Surgical stage proceeded without complications in the period of 30-days. The patient was discharged for outpatient rehabilitation treatment

Опыт использования системы вакуумной терапии ран при лечении высокого наружного тонкокишечного свища

The article presents the experience of successful patient treatment with a high external small bowel fistula using a combined approach: surgery and vacuum therapy.В статье приведен опыт успешного лечения пациента с высоким наружным тонкокишечным свищом с помощью комбинированного подхода, сочетающего хирургическое вмешательство и вакуумную терапию

INFLUENCE OF INTRA-ABDOMINAL PRESSURE AND WOUND INFECTION IN THE POST-OPERATIVE PERIOD IN WOMEN WITH OBESITY

To study the dependence of the wound infection rate after cesarean section and the level of postoperative intra-abdominal pressure (IAP) in obese patients. A study was conducted, involving 313 patients delivered by cesarean section. All patients were divided into 4 groups: control group 90, with degree I obesity 137, with II 49 and III 37 patients. The frequency of development of wound postoperative complications was determined, bacteriological studies of amniotic fluid, placenta, lousy and discharge wound of the anterior abdominal wall were carried out. Postoperative dynamics of IAP was investigated. IAP research was carried out using vesical indirect method. Wound postoperative complications were diagnosed in 17,9% of the puerperas, 8,6% of them had a discrepancy and suppuration of the sutures in the anterior abdominal wall. The incidence of wound complications increased with increasing severity of obesity. In patients with severe obesity, in the sowing of septic purulent wounds, microorganisms of the genus Escherichia coli, Enterococcus spp. prevailed. Analysis of postoperative dynamics of IAP showed that in obese patients its values exceeded those in the control group at all stages of the study. The correlation analysis showed the presence of a positive average force of communication between the postoperative intestinal paresis and the development of wound infection, r = 0,500 (p < 0,01). The relationship between wound infection and postoperative dynamics of IAP was approaching a strong-r ratio of 0,654 (p<0,001). Representatives of the intestinal microbioma are leading in patients with obesity in infection of the postoperative wound. In the contamination of the intestinal microflora, intra-abdominal hypertension (IAH) is one of the main triggers. Long-term persistent IAH in the postoperative period is a significant risk factor for the development of postoperative infectious complications