Ideal clocks - a convenient fiction

We show that no device built according to the rules of quantum field theory can measure proper time along its path. Highly accelerated quantum clocks experience the Unruh effect, which inevitably influences their time rate. This contradicts the concept of an ideal clock, whose rate should only depend on the instantaneous velocity.Comment: 5 page

Automated Credibility Assessment on Twitter

n this paper, we make a practical approach to automated credibility assessment on Twitter. We describe the process behind the design of an automated classifier for information credibility assessment. As an addition, we propose practical implementation of TwitterBOT, a tool which is able to score submitted tweets while working in the native Twitter interface

Effect of relativistic acceleration on localized two-mode Gaussian quantum states

We study how an arbitrary Gaussian state of two localized wave packets, prepared in an inertial frame of reference, is described by a pair of uniformly accelerated observers. We explicitly compute the resulting state for arbitrarily chosen proper accelerations of the observers and independently tuned distance between them. To do so, we introduce a generalized Rindler frame of reference and analytically derive the corresponding state transformation as a Gaussian channel. Our approach provides several new insights into the phenomenon of vacuum entanglement such as the highly non-trivial effect of spatial separation between the observers including sudden death of entanglement. We also calculate the fidelity of the two-mode channel for non-vacuum Gaussian states and obtain bounds on classical and quantum capacities of a single-mode channel. Our framework can be directly applied to any continuous variable quantum information protocol in which the effects of acceleration or gravity cannot be neglected.Comment: 21 pages, 13 figures. A few typos correcte

EVALUATION OF THE CORTISOL CONCENTRATIONS IN PATIENTS WITH SCHIZOPHRENIA

Introduction: The hypothalamus-pituitary-adrenal axis (HPAA) plays a pivotal role in response to a range of external and internal factors often described as a “stress”. Growing evidence in a literature, suggest various dysregulations of HPAA, in course of numerous mental disorders. Patients with schizophrenia and bipolar disorder seem to have elevated basal cortisol secretion, what might be caused by the diminution of glucocorticoid receptors’ amount. It was of the interest if the cortisol concentrations in patients with diagnosed schizophrenia who underwent treatment, differs from healthy individuals. Materials and methods: Two groups of participants were included into the study. First group (study) consisted of 10 patients with diagnosed schizophrenia and control group which included 38 healthy individuals. Study was divided into two stages, first one (pilot) included only control group, and utilized cortisol concentrations measurement from saliva, blood and 24h urine sample. Second part (main study) involved both groups although focused on a salivary cortisol concentrations. Results: A mean salivary cortisol concentration in patients with schizophrenia who underwent treatment was significantly lower in comparison with healthy individuals. Conclusions: Obtained results indicate that patients who underwent a treatment, and does not present notable clinical signs of schizophrenia may have moderately lowered levels of salivary cortisol. This may be a reflection of relenting psychotic symptoms as well as a direct effect of atypical antipsychotic drugs on a HPA axis activity

Konserwacja szkieletu słonia leśnego Palaeoloxodon antiquus (80–100 tys. lat) ze zbiorów Muzeum Okręgowego w Koninie – badania i praktyka konserwatorska

The article presents the exploratory and conservation-wise problematic aspects of the bones obtained from the skeleton of a forest elephant Palaeoloxodon antiquus (Falconer & Cautley, 1847), that lived during the Eemian Interglacial period 80–100000 years ago. This preserved skeleton, currently in the collection of District Museum in Konin, is particularly valuable due to being one of the largest skeletons in Europe that remained almost complete. The necessity of undertaking conservation processes has been caused by the poor state of its preservation – partly because of degradation of the materials applied during conservation in the 80s of the 20th century and later on, as well as numerous bone tissue damages; there also emerged a possibility of using materials and treatments improving value of the object, aesthetically and exhibition-wise. The publication presents the history of the skeleton and its conservation, the condition, the outline of its bone structure, and the results of instrumental research (ATR-FTIR) of derivative materials composition. Moreover, it shows the assumptions for and course of conservation and restoration works. The performed procedures allowed to stabilize the skeleton, reduce formation of new cracks and cavities, and to restore didactic and exhibition value, enabling the skeleton to be returned to a permanent museum exhibition. The works were twice awarded the 1st prize in the category – conservation and protection of cultural heritage in the prestigious competition Museum Event of the Year “Izabella 2018” and “Izabella 2019” organized by the Wielkopolska Museum Foundation under the patronage of the Marshal of the Wielkopolska Province.W artykule zaprezentowano problematykę badawczo-konserwatorską związaną ze stanem kości należących do szkieletu słonia leśnego Palaeoloxodon antiquus (Falconer& Cautley, 1847), żyjącego w czasie interglacjału eemskiego (80–100 tys. lat temu). Konserwowany szkielet ze zbiorów Muzeum Okręgowego w Koninie jest szczególnie cenny, ponieważ należy do największych i najbardziej kompletnych szkieletów dawnych zwierząt w Europie. Powodem podjęcia działań konserwatorskich był głównie zły stan zachowania obiektu, częściowo degradacja materiałów konserwatorskich użytych w latach osiemdziesiątych i później, a także liczne zniszczenia tkanki kostnej oraz możliwość zastosowania materiałów i zabiegów poprawiających cechy estetyczne i ekspozycyjne szkieletu. W opracowaniu omówiono historię zabytku i jego konserwacji, stan zachowania, zarys budowy kości oraz wyniki badań ATR-FTIR materiałów wtórnych. Przedstawiono ponadto założenia oraz przebieg prac konserwatorsko-restauratorskich. Efektem przeprowadzonych zabiegów jest ustabilizowanie szkieletu, ograniczenie możliwości powstawania nowych spękań i ubytków oraz przywrócenie walorów dydaktycznych i ekspozycyjnych, a w konsekwencji powrót szkieletu na ekspozycję muzealną. Wykonane prace zostały dwukrotnie nagrodzone I nagrodą w kategorii „konserwacja i ochrona dziedzictwa kulturowego” w prestiżowym konkursie Wydarzenie Muzealne Roku „Izabella 2018” i „Izabella 2019” organizowanym przez Fundację Muzeów Wielkopolskich pod patronatem Marszałka Województwa Wielkopolskiego

Multi-point measurements using Class A PQM analyzers

Coraz częściej analizy jakości zasilania oraz dalsze identyfikacje przyczyn i źródeł zakłóceń możliwe są dopiero na podstawie porównań parametrów w charakterystycznych punktach sieci. Jednak wiarygodne wnioski w oparciu o jednoczesne pomiary z kilku analizatorów nawet najwyższej klasy A nie są wcale oczywiste. W niektórych przypadkach są wręcz niewystarczające by być pewnym pełnej zgodności podłączeń, a w konsekwencji sensowności wyników porównań.The power quality analysis of distribution networks and the identification of causes and sources of disturbance are possible and effective on the basis of simultaneous multi-point measurements only. The comparison of parameters at the characteristic points of the network depends on the class of measurement equipment used. But not only the Class A analyzers are enough to get the correct results. In some of real cases, this is the first of three necessary reasons to be sure of comparative effects. The second reason is the uncertainty of time synchronization much better than 0,1 ms. The last necessary and difficult to achieve reason to be sure that the UL1, UL2, UL3 analyzer connectors are connected correctly to the correct phase conductors of each measured points. Only SONEL Power Quality Analyzers Class A PQM-702(T)/703/710/711 let you to use extra functionality dedicated for that. Very helpful compare of perfect GPS synchronized Live Mode Waveforms of voltages. The visual view of comparation of two waveforms is for be sure: PQM’s are synchronized and connected comparable to the same wires of power line

Automated credibility assessment on Twitter

Tyt. z nagłówka.Bibliogr. s. 167-168.In this paper, we make a practical approach to automated credibility assessment on Twitter. We describe the process behind the design of an automated classifier for information credibility assessment. As an addition, we propose practical implementation of TwitterBOT, a tool which is able to score submitted tweets while working in the native Twitter interface.Dostępny również w formie drukowanej.KEYWORDS: Twitter, credibility, Machine Learning Algorithms