Extraction of the proton charge radius from experiments

Static properties of hadrons such as their radii and other moments of the electric and magnetic distributions can only be extracted using theoretical methods and not directly measured from experiments. As a result, discrepancies between the extracted values from different precision measurements can exist. The proton charge radius, $r_p$, which is either extracted from electron proton elastic scattering data or from hydrogen atom spectroscopy seems to be no exception. The value $r_p = 0.84087(39)$ fm extracted from muonic hydrogen spectroscopy is about 4% smaller than that obtained from electron proton scattering or standard hydrogen spectroscopy. The resolution of this so called proton radius puzzle has been attempted in many different ways over the past six years. The present article reviews these attempts with a focus on the methods of extracting the radius.Comment: Mini review, 14 pages, 1 figur

Deontological considerations on academic collaboration in Poland

The author conducted deontological deliberations concerning collaboration among academic workers in the reality of Polish universities. In the view of potential irregularities that threaten this cooperation, it has been investigated what answer is brought in this regard by the ethical codes of universities but also how this problem is perceived by the students who tend to be critical and keen observers. As far as codification is concerned of standards related to the issue in question, Polish academic environment is not in a bad condition. It seems that the problem has been noticed. However, when those documents are perceived as a collection of not so much written, but rather actually recognized values, then the quoted remarks of the students would prove that there is more work to be performed in this respect, which should be deepened under studies of quantitative and qualitative nature. One clear conclusion is drawn from the performed analyses. Namely undermining the authority of one academic by another - in particular in the eyes of the students - results not only in weakening the authority of the humiliated person but mainly of the humiliating individual. Moreover, it contributes to straining the authority of an academic as such

Przeciwdziałanie mobbingowi w Służbie Więziennej w Polsce

The paper deals with the problem of workplace mobbing in the Polish Prison Service. The introduction points out to the multifaceted character of mobbing behaviours. It also mentions their harmful effect on the victim’s personal, family and professional life. Further on, the issue is analysed from the perspective of the Polish labour law by reference to relevant provisions on these matters. Then, the basic issue of the paper is discussed, i.e. mobbing among prison personnel, pointing out that uniformed services are an emanation of the society and can be affected by the same phenomena, including negative ones. To this end, the procedures that are in force in the Prison Service with regard to reacting to mobbing behaviours are described; also, light is cast on appropriate preventing measures, including trainings for management staff, officers, and other personnel of correctional facilities. Finally, reference is made to the criticism formulated against the abovementioned procedures and relevant recommendations are presented, mentioning that counteracting mobbing should take place within the scope of internal regulations of the institution, the practice of management, and the accepted ethics and culture.W artykule podjęto problem mobbingu w Służbie Więziennej w Polsce. We wstępie wskazano na wieloaspektowy charakter zachowań mobbingowych. Zasygnalizowano ich szkodliwy wpływ na życie osobiste, rodzinne i zawodowe ofiary oraz przeanalizowano zagadnienie z perspektywy polskiego prawa pracy, odwołując się do stosownych zapisów. Następnie przystąpiono do omówienia mobbingu wśród personelu zakładów penitencjarnych, wskazując, że służby mundurowe stanowią emanację społeczeństwa i mogą w nich występować identyczne zjawiska, włącznie z negatywnymi. W związku z tym opisano obowiązujące w Służbie Więziennej procedury dotyczące reagowania na zachowania mobbingowe oraz naświetlono adekwatne działania profilaktyczne, m.in. szkolenia dla kadry kierowniczej, funkcjonariuszy i pozostałych członków personelu zakładów penitencjarnych. Na koniec przywołano zarzuty formułowane w stosunku do wyżej wspomnianych procedur oraz przedstawiono stosowne rekomendacje, podkreślając, że przeciwdziałanie mobbingowi powinno się odbywać w wymiarze prawa wewnętrznego danej instytucji, praktyki zarządzania, ale też w obszarze przyjętej etyki i kultury

Sensitivity analysis for shape perturbation of cavity or internal crack using BIE and adjoint variable approach

This paper deals with the application of the adjoint variable approach to sensitivity analysis of objective functions used for defect detection from knowledge of supplementary boundary data, in connection with the use of BIE/BEM formulations for the relevant forward problem. The main objective is to establish expressions for crack shape sensitivity, based on the adjoint variable approach, that are suitable for BEM implementation. In order to do so, it is useful to consider first the case of a cavity defect, for which such boundary-only sensitivity expressions are obtained for general initial geometry and shape perturbations. The analysis made in the cavity defect case is then seen to break down in the limiting case of a crack. However, a closer analysis reveals that sensitivity formulas suitable for BEM implementation can still be established. First, particular sensitivity formulas are obtained for special shape transformations (translation, rotation or expansion of the crack) for either two- or three-dimensional geometries which, except for the case of crack expansion together with dynamical governing equations, are made only of surface integrals (three-dimensional geometries) or line integrals (two-dimensional geometries). Next, arbitrary shape transformations are accommodated by using an additive decomposition of the transformation velocity over a tubular neighbourhood of the crack front, which leads to sensitivity formulas. This leads to sensitivity formulas involving integrals on the crack, the tubular neighbourhood and its boundary. Finally, the limiting case of the latter results when the tubular neighbourhood shrinks around the crack front is shown to yield a sensitivity formula involving the stress intensity factors of both the forward and the adjoint solutions. Classical path-independent integrals are recovered as special cases. The main exposition is done in connection with the scalar transient wave equation. The results are then extended to the linear time-domain elastodynamics framework. Linear static governing equations are contained as obvious special cases. Numerical results for crack shape sensitivity computation are presented for two-dimensional time-domain elastodynamics

Effects of drip irrigation on the yield of strawberry plants grown under arable conditions

ArticleThe study investigated the effects of drip irrigation on the yield of ‘Honeoye’ strawberry plants for commercial purposes grown under arable conditions throughout the harvest season. The plants were irrigated at irregular intervals depending on natural precipitation. Crop yields and fruit parameters (diameter, length, individual weight, count per plant) were compared on several harvest dates. Statistical analysis has shown that irrigation has a significant impact on yield and fruit parameters. The irrigated plants yielded more strawberries, which also had a larger diameter, length, and individual weight

Gravitational Equilibrium in the Presence of a Positive Cosmological Constant

We reconsider the virial theorem in the presence of a positive cosmological constant Lambda. Assuming steady state, we derive an inequality of the form rho >= A (Lambda / 4 pi GN) for the mean density rho of the astrophysical object. With a minimum at Asphere = 2, its value can increase by several orders of magnitude as the shape of the object deviates from a spherically symmetric one. This, among others, indicates that flattened matter distributions like e.g. clusters or superclusters, with low density, cannot be in gravitational equilibrium.Comment: 7 pages, no figure

A note on the Cops & Robber game on graphs embedded in non-orientable surfaces

The Cops and Robber game is played on undirected finite graphs. A number of cops and one robber are positioned on vertices and take turns in sliding along edges. The cops win if they can catch the robber. The minimum number of cops needed to win on a graph is called its cop number. It is known that the cop number of a graph embedded on a surface $X$ of genus $g$ is at most $3g/2 + 3$, if $X$ is orientable (Schroeder 2004), and at most $2g+1$, otherwise (Nowakowski & Schroeder 1997). We improve the bounds for non-orientable surfaces by reduction to the orientable case using covering spaces. As corollaries, using Schroeder's results, we obtain the following: the maximum cop number of graphs embeddable in the projective plane is 3; the cop number of graphs embeddable in the Klein Bottle is at most 4, and an upper bound is $3g/2 + 3/2$ for all other $g$.Comment: 5 pages, 1 figur

Evidence of Pentaquark States from K+ N Scattering Data?

Motivated by the recent experimental evidence of the exotic B = S = +1 baryonic state Theta(1540), we examine the older existing data on K+ N elastic scattering through the time delay method. We find positive peaks in time delay around 1.545 and 1.6 GeV in the D03 and P01 partial waves of K+ N scattering respectively, in agreement with experiments. We also find an indication of the J=3/2 Theta* spin-orbit partner to the Theta, in the P03 partial wave at 1.6 GeV. We discuss the pros and contras of these findings in support of the interpretation of these peaks as possible exotics.Comment: 10 pages, 4 figure