26 research outputs found

    The CosmicWatch Desktop Muon Detector: a self-contained, pocket sized particle detector

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    The CosmicWatch Desktop Muon Detector is a self-contained, hand-held cosmic ray muon detector that is valuable for astro/particle physics research applications and outreach. The material cost of each detector is under $100 and it takes a novice student approximately four hours to build their first detector. The detectors are powered via a USB connection and the data can either be recorded directly to a computer or to a microSD card. Arduino- and Python-based software is provided to operate the detector and an online application to plot the data in real-time. In this paper, we describe the various design features, evaluate the performance, and illustrate the detectors capabilities by providing several example measurements.Comment: 11 pages, 8 figure

    An├ílisis multi-aspectual de ├║tiles neol├şticos de hueso procedentes del yacimiento 6 de Kopyd┼éowo (Polonia)

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    The paper presents the results of osteological, typological, and microwear analyses of Neolithic bone tools recovered from Kopyd┼éowo, site 6 (Greater Poland Province, Poland). The site is known for a pit with a number of bovine horn cores, a presumable refuse from Neolithic horn working. A multi-aspect analysis revealed the kinds of raw materials used for the production of bone tools and provided insights into how the specimens were worked and used. Twenty-nine out of 36 tools were identified to taxon. All artefacts were made from mammal bones, mostly cattle, sheep/goat, red deer, and pig. Awls and perforators, used to work with a soft organic material, were the most common tool types at the site. Some scrapers and polishers for hide working, as well as spatulae, a T-shaped axe, a chisel, a pendant, and pieces of raw material were also found. The presence of two tools made from wild mammalsÔÇÖ bones may possibly contribute to the discussion on contacts between farmers and hunter-gatherers in the Neolithic.El art├şculo presenta los resultados de los an├ílisis osteol├│gicos, tipol├│gicos y de micro- desgaste de los ├║tiles neol├şticos de hueso recuperados del yacimiento 6 de Kopyd┼éowo (provincia de Gran Polonia, Polonia). Este yacimiento se conoce por un pozo en el que se encontraron varios cuerpos ├│seos de cuernos de b├│vido, un presumible resultado del trabajo neol├ştico del cuerno. Un an├ílisis multi-aspectual revel├│ los tipos de materias primas utilizadas para la producci├│n de instrumentos de hueso y proporcion├│ informaci├│n sobre c├│mo se trabajaron y usaron las piezas. De 29 de 36 ├║tiles se identific├│ el tax├│n faun├şstico. Todos los artefactos se hicieron con huesos de mam├şferos, principalmente de ganado vacuno, de caprinos, ciervos y cerdos. Punzones y perforadores, utilizados para trabajar material org├ínico blando, eran los tipos de instrumentos m├ís comunes en el yacimiento. Tambi├ęn se encontraron algunos raspadores y pulidores para el trabajo de la piel, as├ş como esp├ítulas, un hacha en forma de T, un cincel, un colgante y fragmentos de materia prima. La presencia de dos instrumentos hechos de huesos de mam├şferos salvajes posiblemente contribuya a la discusi├│n sobre los contactos entre los agricultores y los cazadores-recolectores durante el Neol├ştico

    Zesp├│┼é Richtera objawiaj─ůcy si─Ö jako ch┼éoniak rozlany ┼╝uchwy z du┼╝ych kom├│rek B ze zmianami litycznymi i prze┼éomem hiperkalcemicznym

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    Richter's Syndrome (RS) is a transformation from chronic lymphocytic leukemia (CLL) into more aggressive lymphoma. RS occurs in about 5% of patients with CLL and its clinical outcome is poor. Extranodal involvements of RS may be present in up to 40% of patients and central nervous system manifestation was found to be the most common. Mandibular localization of RS has not been reported so far. There is no established standard treatment for RS. The improvement of survival in RS patients is achievable with intensive anti-lymphoma chemotherapy and subsequent allogeneic stem cell transplantation (alloHSCT) performed in complete remission. Herein we report a female with RS of the right mandible and hypercalcemia was its first clinical manifestation

    Habitat-specific benthic metabolism in a Mediterranean-type intermittent stream

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    A modified flow-through chamber method was used to measure gross primary production (GPP), net primary production (NPP), community respiration (CR) and associated environmental variables in an intermittent Mediterranean-type stream in Southern Portugal. Three common types of in stream habitats were targeted: cobble (C), cobble covered with filamentous algae (C+A) and leaf litter (LL). NPP, GPP and CR differed significantly among all three habitats. GPP increased with chlorophyll a and, less strongly, with photosynthetic active radiation and, therefore, was highest in C+A habitat. The highest CR was in LL and its variation was best determined by ash-free dry mass (AFDM) of plant litter. Higher respiration in LL was related to heterotrophic activity and, to a lesser extent, to autotrophic respiration associated with periphyton. We observed a decrease of production efficiency of primary producers with AFDM in C+A and C habitats. Our results demonstrate that each habitat type should be considered as a discrete metabolic entity and that particular sets of environmental factors are responsible for habitat specific metabolic responses. Scaling up measurements from discrete habitat patches to the entire reach or stream should not be done by extrapolating the results of a single habitat type and will require quantification of habitat coverage, at the appropriate scale

    The non-competition agreement during the employment as an element of protection of the employer interests

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    Celem niniejszej pracy jest om├│wienie problematyki umowy o zakazie konkurencji w trakcie trwania stosunku pracy w kontek┼Ťcie interes├│w pracodawcy. W dobie rosn─ůcej konkurencji mi─Ödzy przedsi─Öbiorcami i rywalizacji o klienta jest to coraz popularniejszy spos├│b dbania o lojalno┼Ť─ç pracownik├│w o ochrony w┼éasnych interes├│w. Rozdzia┼é 1 dotyczy og├│lnego zarysu tematyki zakazu konkurencji. Pr├│buj─Ö w nim wyja┼Ťni─ç czym jest owy zakaz oraz w jaki spos├│b mo┼╝na wprowadzi─ç go do umowy o zawieranej z pracownikiem. Wskazuj─Ö na jego podstawy prawne a tak┼╝e zwi─ůzek z zasad─ů wolno┼Ťci pracy.Rozdzia┼é 2 nawi─ůzuje ju┼╝ stricte do problemu umowy o zakazie konkurencji w trakcie trwania stosunku pracy. Zajmuj─Ö si─Ö w nim charakterystyk─ů tego typu umowy a tak┼╝e staram si─Ö wyja┼Ťni─ç czym jest klauzula autonomiczna.W rozdziale 3 poruszam kwesti─Ö ochrony interesu pracodawcy poprzez umow─Ö o zakazie konkurencji w trakcie trwania stosunku pracy. Czym jest interes pracodawcy i w jaki spos├│b mo┼╝na go chroni─ç. Pojawia si─Ö tu kwestia tajemnic pracodawcy i dobra zak┼éadu pracy.Rozdzia┼é 4 po┼Ťwi─Öcam drugiej stronie stosunku pracy- pracownikowi. Aby mie─ç pe┼éen przegl─ůd problematyki zakazu konkurencji nie mo┼╝na rozpatrywa─ç go w┼éa┼Ťnie bez pracownika. Jego interes├│w oraz obowi─ůzk├│w. Poruszam kwesti─Ö konsekwencji naruszenia zakazu a tak┼╝e dodatkowej dzia┼éalno┼Ťci zarobkowej pracownika.The purpose of the present thesis is to discuss the problem of non-competition agreements during the employment in the context of employerÔÇÖs interests. In the times of increasing competitions between businessman and rivalry over a client, it is more and more popular way of ensuring the employeesÔÇÖ loyalty and protecting own interests Chapter 1 deals with the general outline of the subject area concerning the non-competition agreements . Its aim is to explain what the non-competition agreement is as well as the ways in which it may be introduced into the agreement drawn with the employee. WhatÔÇÖs more, I indicate the legal basis for it and its connection with the ÔÇťright-to-workÔÇŁ law. Chapter 2 examines strictly the issue of non-competition agreements during the employment. I describe the characteristics of this sort of agreements and attempt to explain what the autonomy clause is. In chapter 3 I examine the matter of protecting employerÔÇÖs interests through the non-competition agreement during the employment as well as what is the employerÔÇÖs interest and how it can be defended. Moreover, the issues of employer secrets and working place well-fare appear in this chapter. Chapter 4 is dedicated to the other side of the employment agreement ÔÇô the employee. In order to have the full overview of the non-competition agreement issue it is necessary to take into consideration the employee, his interests and responsibilities. Therefore, I discuss the matter of consequences for violating the agreement as well as the additional gainful activities of the employe

    Analiza wybranego modelu logistycznego sklepu internetowego

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    Nowadays, in the era of dynamically developing IT services, online shopping is becoming more and more popular all over the world. Owners of online stores, wanting to focus their activities on customer service aspects, are increasingly deciding to use logistics outsourcing to entrust many processes to specialists. This premise has become the reason for undertaking research in the area of analysis of one of the logistic models used in online stores ÔÇô dropshipping. The article presents the results of the SWOT analysis and Business Model Canvas for the dropshipping logistics model. The publication also contains the results of surveys conducted among respondents running an online store using pure and partial dropshipping. The test results were processed using cardinality analyses. The summary indicates the key success factors for using this model in an online store.W obecnych czasach, w dobie dynamicznie rozwijaj─ůcych si─Ö us┼éug informatycznych, zakupy internetowe ciesz─ů si─Ö na ca┼éym ┼Ťwiecie coraz wi─Öksz─ů popularno┼Ťci─ů. W┼éa┼Ťciciele sklep├│w internetowych, chc─ůc skupi─ç swoj─ů dzia┼éalno┼Ť─ç na aspektach dotycz─ůcych obs┼éugi klienta, coraz cz─Ö┼Ťciej decyduj─ů si─Ö skorzysta─ç z outsourcingu logistycznego, aby wiele proces├│w odda─ç w r─Öce specjalist├│w. Przes┼éanka ta sta┼éa si─Ö przyczyn─ů podj─Öcia bada┼ä w obszarze analizy jednego z modeli logistycznych stosowanych w sklepach internetowych ÔÇô dropshippingu. W artykule przedstawiono wyniki analizy SWOT oraz Business Model Canvas dla modelu logistycznego dropshipping. W publikacji zawarto r├│wnie┼╝ wyniki bada┼ä ankietowych przeprowadzonych w┼Ťr├│d respondent├│w prowadz─ůcych sklep internetowy wykorzystuj─ůcy dropshipping czysty i cz─Ö┼Ťciowy. Wyniki bada┼ä poddano obr├│bce za pomoc─ů analiz liczno┼Ťci. W podsumowaniu wskazano kluczowe czynniki sukcesu dla stosowania tego modelu w sklepie internetowym

    Long-Term Patterns in the Population Dynamics of Daphnia longispina, Leptodora kindtii and Cyanobacteria in a Shallow Reservoir: A Self-Organising Map (SOM) Approach.

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    The recognition of long-term patterns in the seasonal dynamics of Daphnia longispina, Leptodora kindtii and cyanobacteria is dependent upon their interactions, the water temperature and the hydrological conditions, which were all investigated between 1999 and 2008 in the lowland Sulejow Reservoir. The biomass of cyanobacteria, densities of D. longispina and L. kindtii, concentration of chlorophyll a and water temperature were assessed weekly from April to October at three sampling stations along the longitudinal reservoir axis. The retention time was calculated using data on the actual water inflow and reservoir volume. A self-organising map (SOM) was used due to high interannual variability in the studied parameters and their often non-linear relationships. Classification of the SOM output neurons into three clusters that grouped the sampling terms with similar biotic states allowed identification of the crucial abiotic factors responsible for the seasonal sequence of events: cluster CL-ExSp (extreme/spring) corresponded to hydrologically unstable cold periods (mostly spring) with extreme values and highly variable abiotic factors, which made abiotic control of the biota dominant; cluster CL-StSm (stable/summer) was associated with ordinary late spring and summer and was characterised by stable non-extreme abiotic conditions, which made biotic interactions more important; and the cluster CL-ExSm (extreme/summer), was associated with late spring/summer and characterised by thermal or hydrological extremes, which weakened the role of biotic factors. The significance of the differences between the SOM sub-clusters was verified by Kruskal-Wallis and post-hoc Dunn tests. The importance of the temperature and hydrological regimes as the key plankton-regulating factors in the dam reservoir, as shown by the SOM, was confirmed by the results of canonical correlation analyses (CCA) of each cluster. The demonstrated significance of hydrology in seasonal plankton dynamics complements the widely accepted pattern proposed by the plankton succession model for lakes, the PEG (Plankton Ecology Group), and may be useful for the formulation of management decisions in dam reservoirs
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