National comparison of methods for determination of radon in water

The article describes three interlaboratory experiments concerning 222Rn determination in water samples. The fi rst two experiments were carried out with the use of artifi cial radon waters prepared by the Laboratory of Radiometric Expertise (LER), Institute of Nuclear Physics, Polish Academy of Sciences in Kraków in 2014 and 2018. The third experiment was performed using natural environment waters collected in the vicinity of the former uranium mine in Kowary in 2016. Most of the institutions performing radon in water measurements in Poland were gathered in the Polish Radon Centre Network, and they participated in the experiments. The goal of these exercises was to evaluate different measurement techniques used routinely in Polish laboratories and the laboratories’ profi ciency of radon in water measurements. In the experiment performed in 2018, the reference values of 222Rn concentration in water were calculated based on the method developed at LER. The participants’ results appeared to be worse for low radon concentration than for high radon concentrations. The conclusions drawn on that base indicated the weaknesses of the used methods and probably the sampling. The interlaboratory experiments, in term, can help to improve the participants’ skills and reliability of their results

Mechanical thrombectomy in acute stroke – Five years of experience in Poland

Objectives Mechanical thrombectomy (MT) is not reimbursed by the Polish public health system. We present a description of 5 years of experience with MT in acute stroke in Comprehensive Stroke Centers (CSCs) in Poland. Methods and results We retrospectively analyzed the results of a structured questionnaire from 23 out of 25 identified CSCs and 22 data sets that include 61 clinical, radiological and outcome measures. Results Most of the CSCs (74%) were founded at University Hospitals and most (65.2%) work round the clock. In 78.3% of them, the working teams are composed of neurologists and neuro-radiologists. All CSCs perform CT and angio-CT before MT. In total 586 patients were subjected to MT and data from 531 of them were analyzed. Mean time laps from stroke onset to groin puncture was 250±99min. 90.3% of the studied patients had MT within 6h from stroke onset; 59.3% of them were treated with IV rt-PA prior to MT; 15.1% had IA rt-PA during MT and 4.7% – emergent stenting of a large vessel. M1 of MCA was occluded in 47.8% of cases. The Solitaire device was used in 53% of cases. Successful recanalization (TICI2b–TICI3) was achieved in 64.6% of cases and 53.4% of patients did not experience hemorrhagic transformation. Clinical improvement on discharge was noticed in 53.7% of cases, futile recanalization – in 30.7%, mRS of 0–2 – in 31.4% and mRS of 6 in 22% of cases. Conclusion Our results can help harmonize standards for MT in Poland according to international guidelines

Inkunabuły Biblioteki Kórnickiej – stan obecny i perspektywy badawcze

Th e scope of the project carried out in the Kórnik Library in 2016-2019 included the set of incunabula kept in the facility. Th is paper sums up the works concerning this part of the book collection. Th e author presents new fi ndings concerning the holdings, simultaneously indicating the need for further research on the oldest treasures of the European printing industry kept at the library established by Tytus Działyński

Feelings, emotions and life attitudes of Anna Radziwiłł née Mycielska in the light of her letters: a contribution to research on women from magnate circles of the Grand Duchy of Lithuania

The article aims to show the character of Anna Radziwiłł née Mycielska, the second wife of Michał Kazimierz Radziwiłł ‘Rybeńko’ in the light of her correspondence. The proposed approach focuses on changes in her personality taking place at key moments in her life. The source basis are letters from the Voivode of Vilnius to her husband kept in the Central Archives of Historical Records in Warsaw. The authors of this paper made an attempt to present Anna Radziwiłł from the perspective of her roles: wife, mother, and woman

Application of Data Mining Techniques to Predict Luminance of Pavement Aggregate

The primary purpose of the analysis presented here is to assess the feasibility of effectively predicting the aggregate luminance coefficient. Current road lighting standards and recommendations are based on assessing the level and distribution of luminance on the road surface. The brightness of a road surface depends on the amount of light falling on it, as well as the reflective properties of the road surface, which in turn depend on its physical condition, type and mineralogical composition. The complexity of the factors on which the value of the luminance coefficient depends it makes that data mining techniques the most appropriate tools for evaluation luminance coefficient phenomenon. This article uses five types of techniques: C&RT, boosted trees, random forest, neural network, and support vector machines. After a preliminary analysis, it was determined that the most effective technique was the boosted tree method. The results of the analysis indicated that the actual value of the luminance coefficient has multiple modal values within a single aggregate stockpile, depending on the mineralogical composition and grain size, and cannot be determined by a single central measure. The present model allowed us to determine the value of the luminance coefficient Qd with a mean error of 4.3 mcd-m−2·lx−1. In addition, it was found that the best aggregate for pavement brightening that allows high visibility during the day Qd and at night RL is a limestone aggregate. In the group of those that have the ability to potentially brighten the pavement were quartzite and granite aggregates

Listy Anny z Mycielskich Radziwiłłowej oraz diariusz Charles’a de Saint-Pola jako źródło do badań działalności „dyplomatycznej” wojewodziny wileńskiej

In the following paper the authors decided to discuss the „diplomatic” correspondence of the Anna Radziwiłłowa (de domo Mycielska) and the diary of the baron Charles de Saint-Pol, which are nowadays in the repertory of the Central Archives of Historical Records in Warsaw, touching the matter of the action took by the second wife of the Michał Kazimierz Radziwiłł „Rybeńko” in the case of his son „Panie Kochanku” (Karol Stanisław Radziwiłł) in the 1764