Delete or merge regressors for linear model selection

We consider a problem of linear model selection in the presence of both continuous and categorical predictors. Feasible models consist of subsets of numerical variables and partitions of levels of factors. A new algorithm called delete or merge regressors (DMR) is presented which is a stepwise backward procedure involving ranking the predictors according to squared t-statistics and choosing the final model minimizing BIC. In the article we prove consistency of DMR when the number of predictors tends to infinity with the sample size and describe a simulation study using a pertaining R package. The results indicate significant advantage in time complexity and selection accuracy of our algorithm over Lasso-based methods described in the literature. Moreover, a version of DMR for generalized linear models is proposed

Lepidoptera recorded on snow in Central Poland

Sixteen species of Lepidoptera, belonging to 10 families, were recorded on snow in Central Poland. Two episodes of mass occurrence on snow were observed: adults of Operophtera brumata and larvae of Euthrix potatoria. Twelve species were recorded from snow for the first time in general. Three ecological groups of snow active Lepidoptera were distinguished: 1) autumn and winter active moths, 2) overwintering species which could be periodically activated from diapause, and 3) early spring active species. The ecology of winter active Lepidoptera is discussed. All were classified as chionoxenes, while O. brumata was considered as the moth most regularly recorded on snow andmost likely to be met in winter

Regenerative medicine in orthopedics

Regenerative medicine is an interdisciplinary field of science that has been experiencing its renaissance in recent years. It involves many hopes regarding the possibility of breeding the organ needed for transplantation for a given patient in laboratory conditions. The most important "component" in regenerative medicine are stem cells and other elements that create an ideal environment for their proper development and organization of tissue architecture

Statistical analysis angle values brachiocephalic-foream after epicondyle of the humerus fracture in children

Statistical analysis angle values brachiocephalic-foream after epicondyle of the humerus fracture in childrenSummaryIntroduction. The brachial epithelial fractures of the humerus are typical childhood traumas. Complex anatomy and biomechanics of the elbow cause that the treatment and evaluation of the results of the epidural fractures is still being investigated. In the literature many works have been devoted to pathomechanism, types of treatment, prevention of complications.Objective. The aim was to determine the most frequently occurring deviations from the normal state after a fracture and factors affecting the distal consequences of fracture of the superficial humeral humerus.Material and methods. 282 patients with transverse epicardial displacement of the humerus were included. During the study the total number of children hospitalized due to the injury of the elbow was 488.Results. 73.3% of patients had a deviation of the shoulder and forearm angle after fracture. Valvular deformity was reported in 13.9%. 180º (cubitus rectus) arm-and-mouth angle occurred in 17.8%. The reduction of angina in the range of valvular heart disease occurred in 17.8%. Increased elbow flexion occurred in 22.8% of cases.Conclusions. The brachial epithelial fractures of the humerus account for 57.9% of all injuries to the elbow joint in children. The deviation of the brachial-forearm angle occurred in 72.3% of cases. Most of them, because 22.3% of the lumbar deformities were observed. The elbow varus occurred in 13.9% of children. The low rate of observed deformation was the result of the accepted measurement method. At the recording of each deviation, the percentage of observed cases of elbow joint increased to 49.5%

Thermoregulation and its disorders in the children’s perioperative period

Disorders of termoregulation is a phenomeon that can occur as a result of any kind of anaesthesia. In the perioperative period, infants and small children are most exposed to significant and dangerous changes in body temperature, especially hypothermia. When the body cools to values under 36˚C during simple surgery, it is called uncontrolled hypothermia and can be dangerous to the health or even lifethreating to a small patient. Preventive measures of intraoperative accidential hypothermia are according room temperature. Hypothermia as an intended phenomenon artificially produced is used in such medical fields as: • cardiosurgery in cases of cardiotomy surgery in infants • neurosurgery in lowering intracranial pressure • analgesia through cooling as an effective pain - relieving method Disorders of termoregulation mechanism leading to rising body temperature is called hyperthermia. It can occur as a sudden reaction to an anaesthetic agent (halothane, enufluran, izofluran, sewofluran, desfluran, suksametonium) revealed during anaesthesia – a genetically determined disease called Fulminant Hyperthermia. The essence of hyperthermia treatment is early diagnosis and fast treatment relying on the removal of causes and symptoms and, above all, needs to be preventative. Regular measurement of both surface and central temperature can allow for quick action against hypothermia or hyperthermia in children

„Monitoruję więc jestem… zdrowszy”. Konsekwencje dynamicznego rozwoju self-trackingu dla zdrowia

The article presents the issue, which is still little-known in Poland, and relates to monitoring one’s health using self-tracking applications and devices. Based on the narrative literature review, numerous positive and negative consequences of self-monitoring of health have been identified. It has been shown that the development of technology has had an impact on changing the understanding of the term “healthcare”, which now must take into account the fact that patients become experts of their bodies as they can measure different aspects of it. The article also discusses the concept of “self-tracking culture”, indicating that its actors are not only members of the Quantified Self social movement, but also doctors, health care institutions and even some employers. In the article the distinction between “voluntary” and “recommended” self-tracking is made. The sociological interpretations of the phenomenon of self-tracking were also presented. Finally, potential areas of sociological research concerning this phenomenon are shown.Artykuł prezentuje wciąż mało rozpoznaną w Polsce problematykę związaną z monitorowaniem własnego zdrowia przy pomocy aplikacji i urządzeń do self-trackingu. Na podstawie dokonanego narracyjnego przeglądu literatury zidentyfikowane zostały liczne zarówno pozytywne, jak i negatywne konsekwencje samodzielnego dokonywania przez ludzi rozmaitych pomiarów związanych ze zdrowiem. Pokazano, że rozwój technologii ma wpływ na zmianę rozumienia terminu „opieka zdrowotna”, które musi wziąć pod uwagę to, że pacjenci dzięki dokonywanym pomiarom stają się ekspertami swojego organizmu. Artykuł omawia także pojęcie „kultury self-tracking”, wskazując, że jej aktorami są już nie tylko członkowie ruchu społecznego Quantified Self, ale również lekarze, instytucje opieki zdrowotnej, a nawet niektórzy pracodawcy. Wprowadzone zostaje rozróżnienie na self-tracking dokonywany „z własnych chęci” oraz „odgórnie zalecony”. Przestawione zostały także socjologiczne interpretacje zjawiska self-tracking. W zakończeniu pokazano potencjalne obszary badań socjologicznych dotyczące tego zjawiska

Land subsidence caused by solution mining in the Mogilno salt dome

Occurrence of land surface subsidence is a result of rock salt extraction. The process is observed by geodetic measurements. On the Palędzie I salt mining field, such measurements are conducted every five years. The most recent series of measurements was carried out in 2009. The analysis of land levelling results indicated that a twin-centre subsidence is still being formed above the salt mining area. Its maximum load on the SW side of the salt dome exceeded −100 mm in 1986–2009. The second subsidence centre behind the NE edge pillar is 50% smaller than the first one. Along with the extraction moving up to shallower areas of the salt bed, the rate of land surface subsidence is increasing, with the decreasing perimeter of the depression. The indicators that describe the land surface subsidence – vertical displacement of benchmarks and the caverns volume – are presented on the function of time and a parameter, determining the distance from the measurement point to the exploitation field edges

Wiesław Krzemiński—a man of a great passion for fossil flies

Includes: Appendix. Publications of Wiesław Krzemiński (1978–2019)Wiesław Krzemiński was born on 26 October 1948, in Oświęcim, south of Poland. In his youth he was an addicted book reader and developed his love for nature. After few years of playing in a big beat band he eventually focused on biology. Currently, he is a full time Professor and works in the Institute of Systematics and Evolution Polish Academy of Sciences in Kraków (ISEA PAS) and the Pedagogical University in Kraków

NUMERICAL ANALYSIS OF STRESS DISTRIBUTION IN THE REINFORCED CONCRETE SUPPORT BEAM BRACKET EXPOSED TO DAMAGE

The article presents analysis of stress distribution in the reinforced concrete support beam bracket which is a component of prefabricated reinforced concrete building. The building structure is spatial frame where dilatations were applied. The proper stiffness of its structure is provided by frames with stiff joints, monolithic lift shifts and staircases. The prefabricated slab floors are supported by beam shelves which are shaped as inverted letter ‘T’. Beams are supported by the column brackets. In order to lower the storey height and fulfill the architectural demands at the same time, the designer lowered the height of beam at the support zone. The analyzed case refers to the bracket zone where the slant crack. on the support beam bracket was observed. It could appear as a result of overcrossing of allowable tension stresses in reinforced concrete, in the bracket zone. It should be noted that the construction solution applied, i.e. concurrent support of the “undercut” beam on the column bracket causes local concentration of stresses in the undercut zone where the strongest transverse forces and tangent stresses occur concurrently. Some additional rectangular stresses being a result of placing the slab floors on the lower part of beam shelves sum up with those described above