185 research outputs found

    Increase of the Energy Necessary to Probe Ultraviolet Theories Due to the Presence of a Strong Magnetic Field

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    We use the gauge gravity correspondence to study the renormalization group flow of a double trace fermionic operator in a quark-gluon plasma subject to the influence of a strong magnetic field and compare it with the results for the case at zero temperature and no magnetic field, where the flow between two fixed points is observed. Our results show that the energy necessary to access the physics of the ultraviolet theory increases with the intensity of the magnetic field under which the processes happen. We provide arguments to support that this increase is scheme independent, and to exhibit further evidence we do a very simple calculation showing that the dimensional reduction expected in the gauge theory in this scenario is effective up to an energy scale that grows with the strength of such a background field. We also show that independently of the renormalization scheme, the coupling of the double trace operators in the ultraviolet fixed point increases with the intensity of the background field. These effects combined can change both, the processes that are expected to be involved in a collision experiment at a given energy and the azimuthal anisotropy of the measurements resulting of them.Comment: 23 pages, 10 figures. Added section about renormalization scheme independenc

    Development of German pedelec (and bicycle) accidents between 2012 and 2020

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    In the recent years, pedelecs (pedal electric cycles) have seen a massive growth. in ridership. In 2013, around 1.3 million e-bilces were on German roads, while in 2020, this number was already at 8.5 million (with about 99% of the e-bikes being pedelecs). The rapid spread of pedelecs has given rise to concerns for road safety, especially due to the fact that riders of electric bicycles reach higher speeds. Indeed, some studies have reported that pedelec riders suffer from more severe crashes than users of conventional bikes. However, the highly dynamic development in pedelec ownership and use might cast some doubts on the long term validity of investigations of pedelec accidents and their characteristics that have to rely on data collected over shorter periods of time. Therefore, the aim of this study was to investigate pedelec accidents and their characterutics over several years in a longitudinal fashion. and compare them to accidents involving cyclists, tobe able to identify trends, and to clarify whether such trends are specifiic to pedelecs. [From: Introduction

    Different but also alike? lngroup-outgroup phenomena among cyclists and e-scooter riders.

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    Against the background of an increasing number of cyclists sharing the infrastructure with an also rising number of e-scooter riders in Germany, the question of considerate coexistence among both modes of transportation, especially on shared infrastructure (on- or off-road) arises. In various contexts (e.g. work, education), studies have shown that social identity has an impact on how members of an ingroup ('us') and outgroup (''them') are perceived. These studies are based on social identity theory, which postulates members of the ingroup are more likely to be favored and members of the outgroup are more likely discriminated and stereotyped. This ingroup favorism or outgroup discrimination can refer to attitudes, cognition, and behavior. Initial research in the traffic context by, on which the present study builds, suggests that social identity also plays a role in traffic. Apart from that, research on social identity in traffic is scarce. The aim of the study is to determine whether the role as cyclist or e-scooter rider in traffic can serve as social identity, and subsequently whether ingroup-outgroup phenomena, such as ingroup favorism and effects of outgroup discrimination can be observed. [from Introduction

    Real-World lnteractions between Cyclists and Automated Vehicles - A Wizard-of-Oz Experiment

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    The introduction of automated vehicles (AVs) changes the way road users interact and communicate. In AVs, informal communication such as eye contact or gestures with other road users is omitted. Because interaction should still be objectively and subjectively safe, many studies are currently focusing on the communication processes between (automated) vehicles and predominantly vulnerable road users (VRUs), like pedestrians and cyclists [1 ]. These road users are highly at risk of being fatally injured in road traffic accidents, with the WHO reporting pedestrians and cyclists account for 32 % of all fatalities in Europe [2].... This shows why it is so important to study the interaction processes between VRUs, such as cyclists, and A Vs in real traffic. The algorithms of the A Vs must be able to anticipate the behavior of VRUs and thus ensure a subjectively and objectively safe interaction (cyclists should feel and be safe a.round them). This is the aim of the present study. How do cyclists behave when they encounter an apparent A V for the first time? How do they assess the situation and on what basis do they decide to cross? To answer these questions, a field study will take place in Munich in the summer of 2022, in which such interactions will be observed and the cyclists will be interviewed afterward. The study takes place within the TEMPUS project funded by the BMDV (German Federal Ministry for Digital and Transport). [From: Introduction

    Apoptotic Effects of Etodolac in Breast Cancer Cell Cultures

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    Nonsteroidal anti‐inflammatory drugs (NSAIDs) are commonly used as anti‐inflammatory and analgesic agents. This family of drugs suppresses prostaglandin synthesis through inhibition of cyclooxygenase (COX) enzymes. Recent studies displayed that anti‐carcinogenic actions of these drugs are mediated by COX‐2 enzyme. Currently, there is intense research on COX‐2 inhibitors as therapeutic targets. Etodolac is not perfectly selective but shows ‘preferential selectivity’ for COX‐2. Here, in this study, we wanted to take gene expression snapshots of several apoptotic proteins under different conditions of drug exposure. The aim, therefore, focused to determine differential effects of etodolac on the regulation of apoptotic genes in hormone‐responsive MCF‐7 and triple‐negative MDA‐MB‐231 cancer cell lines. Our data suggest that MDA‐MB‐231 is more responsive to etodolac exposure. Cell proliferation and apoptosis consistently regulated upon drug addiction. Furthermore, COX‐2/HER2 was explicitly an up‐regulated, phosphorylated form of Bad accumulated and anti‐apoptotic proteins SAG and survivin increased in both transcriptional and translational levels. Changes in mitochondrial Bcl‐2 family proteins were moderate and pro‐ and anti‐apoptotic proteins showed similar levels of regulation in both cell lines. We believe that these findings would be supportive for future studies targeting etodolac‐based therapies, as it reveals apoptotic factors differentially regulated in hormone‐responsive and invasive cell lines

    Turismo sostenible ante retroceso glaciar, caso Huaytapallana, Junín

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    Perú is a privileged country, due to the presence of frozen áreas (snowy) at altitudes that reach more than 5 000 m s.n.m. as it is the case of the snowy Huaytapallana in the departamento of Junín; in a study with data from past and present, the retreat of the glaciers in Perú is confirmed, in the Huaytapallna this retreat occurs at a rate of 8,2 m/year, this predicts a critical future in the wáter supply for both the región Junín as for other places in the country. The cause of this retreat are diverse as climate change for human activities, within them irresponsible mining, unsustainable tourism; generating negative impacts to the Huaytapallana mountain; through a traditional tourism, without calaculation of tourist load capacity, pollution is generated, consequently degradation of the natural área (disapperarance of Huaytapallna) and at the same time causes discomfort, dissatisfaction and tourist insecurity.El Perú es un país privilegiado, por la presencia de áreas gélidas (nevados) a altitudes que alcanzan mas de 5 000 m s.n.m. como es el caso del nevado Huaytapallana en el departamento de Junín; en un estudio con datos del pasado y presente se confirma el retroceso de los glaciares en el Perú, en el Huaytapallana este retroceso se da a un ritmo de 8,2 m/año, esto pronostica un futuro critico en el abastecimiento de agua tanto para la región Junín como para otros lugares del país. La causa de este retroceso son diversos como el cambio climático generado por las actividades humanas, dentro de ellos la minería irresponsable, el turismo insostenible; generando impactos negativos al nevado Huaytapallana; mediante un turismo tradicional, sin cálculo de capacidad de carga turística, se genera contaminación, consecuentemente degradación del área natural (desaparición del Huaytapallana) y a la vez provoca incomodidad, insatisfacción e inseguridad turística

    lmportance of safety and road surface for route choice when riding shared e-scooters vs. bicycles

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    The rise of micromobility, most notably electric standing scooters (e-scooters), has resulted in new challenges for traffic planning and road safety. One such issue is the fact that in most European countries, e-scooter users are obliged to ride their vehicle on cycling infrastructure and thereby share this infrastructure with bicyclists. This increases the use of and, subsequently, demand for bicycle lanes, which is an obvious challenge for transport planning. However, for adequate planning and construction of cycling infrastructure, information on route choice behavior of bicyclists and e-scooter users and its influencing factors is necessary. While research on bicyclists' route choice is well advanced, research on e-scooter riders is still in its infancy. For bicyclists, the presence of bicycle facilities, traffic volume, and travel time are among others particularly important for route choice. However, the question arises whether this also applies to e-scooter riders as vehicle dynamics are different and riders are, at least for now, less skilled due to lack of training and exposition. In order to fill this research gap, we aimed to analyze the determinants for route choice of e-scooter users in comparison to bicyclists in a field study. [from Introduction

    Implementering i kraft av beste praksis? En kvalitativ studie av konsulentselskapers konsepter for iverksetting

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    Avhandlingen har søkt innsyn i hvilke teoretiske og metodiske tilnærminger som ligger til grunn for eksterne konsulenters rådgivning av norske næringslivskunder om iverksetting. Svar på slike spørsmål er under strengt bevoktede hensyn og er ikke offentlig tilgjengelig. Metoden som er anvendt for å få innsyn i forretningsintern informasjon, har basert seg på intervjuer av konsulenter fra seks forskjellige konsulentfirmaer i Norge. Avhandlingen illustrerer flere ulike konsulentselskapers konsepter for implementering, der hovedintensjonen har vært å konkretisere hvordan konsulentene oppfatter dem og tar disse i bruk i skiftende klientkontekster. Basert på en gjennomgang av metodikkene fremkommer det at avhandlingens utvalg av konsulenter praktiserer ut fra relativt like oppskrifter. Et sentralt spørsmål i avhandlingen, er om eksterne konsulenter kan anvende beste praksiser i sine iverksettingsoppdrag. Eller må konsulenter i likhet med organisasjoner være dyktige på omstillinger med å tilpasse seg skiftende terreng? Avhandlingen kommer frem til at beste praksis i liten grad er gjeldende for hvordan avhandlingens utvalg implementerer

    Relación entre el empowerment y el desempeño laboral del personal en la empresa Piura Seafood de la ciudad de Sechura, año 2015

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    La presente investigación analizó la relación entre el empowerment y el desempeño laboral del personal en la empresa Piura Seafood de la ciudad de Sechura, la cual facilitó a la empresa que conozca los indicadores que influyen en ambas variables. La población de esta investigación fue de 67 trabajadores para lo cual la muestra fue el total de la población, para este estudio se aplicaron 3 instrumentos los cuales fueron encuesta, aplicado a todos los trabajadores de la empresa, una entrevista aplicada a la administradora y un análisis documental donde se evaluó a la empresa, utilizando una metodología observacional y un tipo de estudio observacional y correlacional, que analizó la relación que existe entre dos variables. Sobre el empowerment se obtuvo que en la empresa Piura Seafood los trabajadores asumen el liderazgo desde su puesto de trabajo lo que hace que se fortalezca la herramienta empowerment dentro de la empresa, asimismo se obtuvo que el desempeño laboral de los trabajadores se ve influenciado por el compromiso y motivación que tienen hacia la empresa, como retribución a esto la empresa le brinda los recursos necesarios para el mejor desempeño de sus labores. Se obtuvo como resultado que el empowerment si influye en el desempeño laboral, por lo tanto en cuanto mejore el empowerment mejorará el desempeño laboral
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