Brauer-friendly modules and slash functors

This paper introduces the notion of Brauer-friendly modules, a generalisation of endo-p-permutation modules. A module over a block algebra OGe is said to be Brauer-friendly if it is a direct sum of indecomposable modules with compatible fusion-stable endopermutation sources. We obtain, for these modules, a functorial version of Dade's slash construction, also known as deflation-restriction. We prove that our slash functors, defined over Brauer-friendly categories, share most of the very useful properties that are satisfied by the Brauer functor over the category of p-permutation OGe-modules. In particular, we give a parametrisation of indecomposable Brauer-friendly modules, which opens the way to a complete classification whenever the fusion-stable sources are classified. Those tools have been used to prove the existence of a stable equivalence between non-principal blocks in the context of a minimal counter-example to the odd Z*p-theorem.Comment: 20 page

Economic Analysis of Per Acre Carp Fish Farm Production in Khyber Pakhtunkhwa, Pakistan

The research conducted on Economic analysis of Carp Fish Farming in the selected Districts of KP. The prime aim of research was to investigate average cost and revenue of a per unit fish farm and to observe the sensitivity of output to the key factors of production. To analyze the Marginal impact of the inputs, Multiple Linear Regression model was used. A sample of 60 fish farms were selected and the operators/owners were interviewed by using the lottery method from four districts i.e.Dera Ismail Khan ,Kohat , Swabi and Mardan.The whole sample is further categorized according to the area occupied by fish farm in small, Medium and Large farms. The study revealed that the sensitivity of output to Farm area was 3.76 on all farms, which was quite more than output sensitivity to Number of Fingerlings  and capital (i.e.0.92 and 1.92), Capital also comprises the charges of fingerlings bought. The study revealed that farm area is an important determinant and can play key role in boosting the fish production. During the whole study it was observed that Per acre one time investment required for carp fish farm is Rs, 1,24,000/-, while average per unit operating cost is Rs.38,000/- whereas the average annual return is Rs.1,10,370/-The study concluded that this enterprise is financially beneficial business which gives per year profit of Rs. 72,370/-)  and plays a crucial role in earning a respectable livelihood , fulfilling the basic needs at low cost and eradicating poverty by job creation in particular and of KP in general. Keywords: Carp fish, Per Unit Fixed Cost, Operating Cost,, Revenue, Profit, Marginal Analysis etc

Bicycle accidents in urban Zurich: An analysis of temporal patterns, influence of network infrastructure and accident severity

Zurich’s increasing population density has raised concerns about road safety, particularly for cyclists. In Switzerland, there were 5,287 bicycle accidents reported in 2022. Despite implementing safer road initiatives, cycling accidents continue to increase in Zurich. The COVID-19 pandemic has encouraged cycling and resulted in a surge of accidents. This study explores the relationship between car traffic, bicycle accidents, and the network infrastructure, aiming to contribute to reducing accidents, analyzing safety factors, and providing proactive solutions for traffic planning in Zurich. Regression models such as the linear mixed effect model, machine learning methods such as the random forest model, and time series analysis were utilized to analyze the spatial and temporal correlations between traffic density, bicycle accidents, and road infrastructure. To conduct this study, pseudo absence points and significant combinations of infrastructure variables were generated and utilized with crash locations to predict the location and severity of a bicycle crash. The research revealed temporal patterns in bicycle crashes and identified a positive association between motorized vehicles and bicycles. The spatial analysis pinpointed high-risk accident locations, especially within areas of high complexity traffic density, and underscored the paramount importance of bicycle infrastructure. By modeling crash severity with a focus on infrastructure variables, it was possible to predict crash outcomes and discern the role of involved vehicles and age in severe bicycle crashes. Traffic and infrastructure are central to bicycle crashes. When paired with spatial analysis, temporal patterns spotlight high-risk zones and periods. Crucial infrastructure elements, such as road width and proximity to tram tracks, profoundly impact crash severity. Addressing these components may aid in enhancing bicycle safety in urban contexts

A conceptual design of an advanced 23 m diameter IACT of 50 tons for ground-based gamma-ray astronomy

A conceptual design of an advanced Imaging Air Cherenkov Telescope with a 23 m diameter mirror and of 50 tons weight will be presented. A system photon detection efficiency of 15-17%, averaged over 300-600 nm, is aimed at to lower the threshold to 10-20 GeV. Prospects for a second generation camera with Geiger-mode Avalanche Photo Diodes will be discussed.Comment: 4 pages, 1 figure, to appear in the proceedings of the 31th International Cosmic Ray Conference, Lodz, Poland, 200

The Active Mirror Control of the MAGIC Telescope

One of the main design goals of the MAGIC telescopes is the very fast repositioning in case of Gamma Ray Burst (GRB) alarms, implying a low weight of the telescope dish. This is accomplished by using a space frame made of carbon fiber epoxy tubes, resulting in a strong but not very rigid support structure. Therefore it is necessary to readjust the individual mirror tiles to correct for deformations of the dish under varying gravitational load while tracking an object. We present the concept of the Active Mirror Control (AMC) as implemented in the MAGIC telescopes and the actual performance reached. Additionally we show that also telescopes using a stiff structure can benefit from using an AMC.Comment: Contribution to the 30th ICRC, Merida, Mexico, July 2007 on behalf of the MAGIC Collaboratio

Efectos de la fecha de siembra sobre el rendimiento y calidad comercial del maíz dulce (Zea Mays L., var. saccharata körn)

El efecto de la fecha de siembra sobre la producción y calidad del cultivo de maíz dulce en el norte de la provincia de Buenos Aires no ha sido estudiado y su conocimiento resulta de suma importancia para la planificación y obtención de resultados óptimos y viabilidad comercial para los productores de dicha zona. En base a esta problemática se estudió el efecto de tres fechas de siembra: 28 de octubre, 9 de noviembre y 5 de diciembre 2009 (fecha 1, 2 y 3, respectivamente) sobre el rendimiento y calidad comercial de Maíz Dulce (Zea Mays L., var. saccharata körn). La hipótesis principal que guió este trabajo fue que el atraso de la fecha de siembra reduciría el tamaño y peso de la espiga de maíz dulce afectando sus parámetros comerciales. Para poner a prueba esta hipótesis, se realizó un ensayo a campo en la localidad de Capilla del Señor, provincia de Buenos Aires. En las tres fechas mencionadas se sembró el híbrido Cahill (P) de un ciclo en fecha de siembra óptima de 75 días. El manejo de los cultivos respondió a un manejo convencional de la zona. Durante el ciclo del cultivo se llevaron a cabo determinaciones densidad y área foliar por planta. El momento de la cosecha se determinó por el método de apreciación visual del grano lechoso. Se tomaron muestras de espigas para la determinación de rendimiento y calidad comercial. El área foliar por planta no presentó diferencias significativas entre la fecha 2 y3, sin embargo hubo una tendencia hacia una mayor área foliar en la fecha 2 (2826 cm2 ± 256) que en la fecha 3 (2596 cm2 ± 256). Además, fue la fecha en la que la radiación acumulada incidente fue mayor (1605 mj/m2) en el ciclo de cultivo, ya que ésta fue en aumento desde principios de octubre hasta fines de enero; a partir de ese momento la radiación cayó marcadamente, coincidiendo con el ciclo del cultivo de la fecha 3 (1555 mj/m2). La mayor radiación incidente y la mayor capacidad de captura de la misma (Área Foliar) se tradujo en un mayor peso de la espiga (270 ± 58 gr) para los cultivos sembrados en la fecha 2 respecto de los de la fecha 3 (204 ± 58) y la fecha 1 (190 ± 58). Por otro lado, los cultivos en la fecha 2 presentaron mejor relación grano/marlo (2,57 ± 0,29) y mayor cantidad de granos comerciales (446 ± 45 granos/espiga) diferenciándose significativamente de los cultivos sembrados en la fecha 3 (1,97 ± 0,29) y la fecha 1 (0,92 ± 0,29) para la relación grano/marlo y también para los granos comerciales, 384 ± 45 y 394 ± 45 en los cultivos de la fecha 3 y 1, respectivamente. En vista de los resultados obtenidos se recomienda la fecha de principios de noviembre como fecha óptima de siembra ya que fue en la que se obtuvo el mayor rendimiento y mejor calidad de producto

Detection of Cherenkov light from air showers with Geiger-APDs

We have detected Cherenkov light from air showers with Geiger-mode APDs (G-APDs). G-APDs are novel semiconductor photon-detectors, which offer several advantages compared to conventional photomultiplier tubes in the field of ground-based gamma-ray astronomy. In a field test with the MAGIC telescope we have tested the efficiency of a G-APD / light catcher setup to detect Cherenkov light from air showers. We estimate a detection efficiency, which is 60% higher than the efficiency of a MAGIC camera pixel. Ambient temperature dark count rates of the tested G-APDs are below the rates of the night sky light background. According to these recent tests G-APDs promise a major progress in ground-based gamma-ray astronomy.Comment: 4 pages, 5 figures, to appear in the proceedings of the 30th International Cosmic Ray Conference, Merida, July 200