Vacuum stability and supersymmetry at high scales with two Higgs doublets

We investigate the stability of the electroweak vacuum for two-Higgs doublet models with a supersymmetric UV completion. The supersymmetry breaking scale is taken to be of the order of the grand unification scale. We first study the case where all superpartners decouple at this scale. We show that contrary to the Standard Model with one Higgs doublet, matching to the supersymmetric UV completion is possible if the low-scale model contains two Higgs doublets. In this case vacuum stability and experimental constraints point towards low values of tan(beta) < 2 and pseudoscalar masses of at least about a TeV. If the higgsino superpartners of the Higgs fields are also kept light, the conclusions are similar and essentially independent of the higgsino mass. Finally, if all gauginos are also given electroweak-scale masses (split supersymmetry with two Higgs doublets), the model cannot be matched to supersymmetry at very high scales when requiring a 125 GeV Higgs. Light neutral and charged higgsinos therefore emerge as a promising signature of a supersymmetric UV completion of the Standard Model at the grand unification scale.Comment: 27 pages, 4 figures; v2: minor changes in references and text, results unchange

A Colletes hederae Schmidt & Westrich, 1993, (Hymenoptera: Colletidae) a hazai fauna új tagja

During the fieldwork at Felsőörs Szent Kereszt hill in the beginning of May of 2016, the authors found a small nesting aggregation of the ivy bee, Colletes hederae (Schmidt & Westrich, 1993). It is the first occurence of the near past described species in Hungary. For a second time, the authors detected pollencollecting females of the species at the end of September in 2019, in Balatonalmádi on ivy (Hedera helix). Present study discusses the characteristics of the species, and summerizes its relationship within the Colletes succinctus grou

Apró közlemények / Short communications

1. Közönséges kígyónyelv (Ophioglossum vulgatum) meglepő új előfordulása a Tiszafüred–Kunhegyesi síkon / Occurrence of Ophioglossum vulgatum in a dry loess grassland in the Tiszafüred–Kunhegyes plain (Great Hungarian Plain) 2. Útépítési nyersanyaggal behurcolt dolomitsziklagyep-fajok tömeges megjelenése Kecskeméten / Dolomite rocky grassland species introduced by raw materials of a road construction (Kecskemét, Great Hungarian Plain) 3. Geranium divaricatum a Hevesi-síkon, Füzesabony mellett / Geranium divaricatum on the Hevesi-sík, next to Füzesabony (Great Hungarian Plain) 4. A pókbangó (Ophrys sphegodes) új előfordulása a vasi flórajárás területén / Ophrys sphegodes in the Castriferreicum (W Hungary) 5. A Cephalanthera longifolia rosea első kimutatása Magyarországon / First occurrence of Cephalanthera longifolia var. rosea in Hungary 6. Spiraea crenata a Keleti-Bakonyban / Spiraea crenata in the Eastern Bakony Mts (Transdanubian Range, Hungary

An Emulation-based Method for Lifetime Estimation of Wireless Sensor Networks

Lifetime estimation in Wireless Sensor Networks (WSN) is crucial to ensure that the network will last long enough (low maintenance cost) while not being over-dimensioned (low initial cost). Existing solutions have at least one of the two following limitations: (1) they are based on theoretical models or high-level protocol implementations, overlooking low-level (e.g., hardware, driver, etc.) constraints which we find have a significant impact on lifetime, and (2) they use an ideal battery model which over-estimates lifetime due to its constant voltage and its inability to model the non-linear properties of real batteries. We introduce a method for WSN lifetime estimation that operates on compiled firmware images and models the complex behavior of batteries. We use the MSPSim/Cooja node emulator and network simulator to run the application in a cycle-accurate manner and log all component states. We then feed the log into our lifetime estimation framework, which models the nodes and their batteries based on both technical and experimental specifications. In a case study of a Contiki RPL/6LoWPAN application, we identify and resolve several low-level implementation issues, thereby increasing the predicted network lifetime from 134 to 484 days. We compare our battery model to the ideal battery model and to the lifetime estimation based on the radio duty cycle, and find that there is an average over-estimation of 36% and 76% respectively.EIT ICT LabsSeCThingsPromo

Technologietraining fuer Facharbeiter/innen aus dem Metall- und Elektrobereich

Der Bericht fasst Erkenntnisse und Erfahrungen zusammen, die bei der wissenschaftlichen Begleitung eines Projektes zur Qualifizierung fuer den Umgang mit neuen Technologien in der metallverarbeitenden Industrie gesammelt wurden. Sie orientieren an dem Technologie-Trainings-Centrum, umreissen aber auch gesellschaftliche Rahmenbedingungen der Technologiequalifizierung in der Bundesrepublik Deutschland. Darueber hinaus werden didaktische Leitlinien beschrieben, die fuer die Autoren im Hinblick auf Curriculumsentwicklungen fuer die berufliche Bildungsarbeit wesentlich waren. Sie bilden die Grundlage fuer den Entwurf offener Curricula fuer die Themenbereiche CAD, Vermittlung mathematisch-naturwissenschaftlich-informationstechnischer Grundlagen und fuer einen integrativen Unterricht. Abschliessend werden politische, organisatorische und paedagogische Schlussfolgerungen fuer innovative Qualifizierungsansaetze gezogen. (IAB)SIGLEAvailable from IAB / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman