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The growing importance of renewable generation connected to distribution grids requires an increased coordination between transmission system operators (TSOs) and distribution system operators (DSOs) for reactive power management. This work proposes a practical and effective interaction method based on sequential optimizations to evaluate the reactive flexibility potential of distribution networks and to dispatch them along with traditional synchronous generators, keeping to a minimum the information exchange. A modular optimal power flow (OPF) tool featuring multi-objective optimization is developed for this purpose. The proposed method is evaluated for a model of a real German 110 kV grid with 1.6 GW of installed wind power capacity and a reduced order model of the surrounding transmission system. Simulations show the benefit of involving wind farms in reactive power support reducing losses both at distribution and transmission level. Different types of setpoints are investigated, showing the feasibility for the DSO to fulfill also individual voltage and reactive power targets over multiple connection points. Finally, some suggestions are presented to achieve a fair coordination, combining both TSO and DSO requirements.
The transfer of historically grown monolithic software architectures into modern service-oriented architectures creates a lot of loose coupling points. This can lead to an unforeseen system behavior and can significantly impede those continuous modernization processes, since it is not clear where bottlenecks in a system arise. It is therefore necessary to monitor such modernization processes with an adaptive monitoring concept to be able to correctly record and interpret unpredictable system dynamics. This contribution presents a generic QoS measurement framework for service-based systems. The framework consists of an XML-based specification for the measurement to be performed – the Information Model (IM) – and the QoS System, which provides an execution platform for the IM. The framework will be applied to a standard business process of the German insurance industry, and the concepts of the IM and their mapping to artifacts of the QoS System will be presented. Furtherm ore, design and implementation of the QoS System’s parser and generator module and the generated artifacts are explained in detail, e.g., event model, agents, measurement module and analyzer module.
Studien zeigen, dass Anhänger der PEGIDA-Bewegung die Medienberichterstattung als unangemessen wahrnehmen und ihr misstrauen. Diese Wahrnehmung und daraus resultierende kognitive, affektive und konative Konsequenzen wurden in einer standardisierten Online-Befragung untersucht (n= 800). Es zeigt sich, dass Anhänger der PEGIDA-Bewegung der Berichterstattung über PEGIDA mehr misstrauen als PEGIDA-Gegner. Diese Wahrnehmung wiederum hat politisch relevante Konsequenzen: Je stärker PEGIDA-Anhänger und neutral Eingestellte der Berichterstattung misstrauen, desto weniger Vertrauen bringen sie den Medien allgemein entgegen, desto unzufriedener sind sie mit der Demokratie in Deutschland und desto wütender sind sie auf die Berichterstattung. Die wütenden Reaktionen korrelieren mit einer Zustimmung zu radikalen Protestformen, was wiederum die Beteiligung an den Protestmärschen erhöht. Somit zeigen die Befunde, dass das Misstrauen in die Berichterstattung über PEGIDA auch über deren Anhängerkreis hinaus eng verbunden ist mit erodierendem Vertrauen in Medien und Politik sowie mit der Bereitschaft zu radikalen Protestformen.
Background
Uncomplicated urinary tract infections (UTI) are common in general practice and usually treated with antibiotics. This contributes to increasing resistance rates of uropathogenic bacteria. A previous trial showed a reduction of antibiotic use in women with UTI by initial symptomatic treatment with ibuprofen. However, this treatment strategy is not suitable for all women equally. Arctostaphylos uva-ursi (UU, bearberry extract arbutin) is a potential alternative treatment. This study aims at investigating whether an initial treatment with UU in women with UTI can reduce antibiotic use without significantly increasing the symptom burden or rate of complications.
Methods
This is a double-blind, randomized, and controlled comparative effectiveness trial. Women between 18 and 75 years with suspected UTI and at least two of the symptoms dysuria, urgency, frequency or lower abdominal pain will be assessed for eligibility in general practice and enrolled into the trial. Participants will receive either a defined daily dose of 3 × 2 arbutin 105 mg for 5 days (intervention) or fosfomycin 3 g once (control). Antibiotic therapy will be provided in the intervention group only if needed, i.e. for women with worsening or persistent symptoms. Two co-primary outcomes are the number of all antibiotic courses regardless of the medical indication from day 0–28, and the symptom burden, defined as a weighted sum of the daily total symptom scores from day 0–7. The trial result is considered positive if superiority of initial treatment with UU is demonstrated with reference to the co-primary outcome number of antibiotic courses and non-inferiority of initial treatment with UU with reference to the co-primary outcome symptom burden.
Discussion
The trial’s aim is to investigate whether initial treatment with UU is a safe and effective alternative treatment strategy in women with UTI. In that case, the results might change the existing treatment strategy in general practice by promoting delayed prescription of antibiotics and a reduction of antibiotic use in primary care.
Research question: In order to reduce fan aggression surrounding rivalry games, team sport organizations often try to placate fans by downplaying the importance of the game (e.g. ‘the derby is not a war’). Drawing on the intergroup conflict literature, this research derives dual identity statements and examines their effectiveness in reducing fan aggressiveness compared to the managerial practice of downplaying rivalry.
Research methods: Three field experimental studies (one face-to-face survey and two online surveys) tested the hypotheses. Established rivalries in the German soccer league Bundesliga served as the empirical setting of the studies. The data were analyzed using ANCOVA and linear regression analyses.
Results and findings: Dual identity statements reduce fan aggressiveness compared to both downplay statements and a no-statement control condition, independent of team identification and trait aggression. Importantly, the managerial practice of downplaying rivalry appears to be counterproductive. It produces even higher levels of fan aggressiveness than making no statement, an effect caused by psychological reactance.
Implications: Sport organizations should not alienate their fan base by attempting to play down the importance of rivalry, which is an integral part of fan identity. Instead, they should strengthen the supporters’ unique identity (as fans of a particular team) while at the same time facilitating identification with the rival at a superordinate level (e.g. as joint fans of a region).
Marketing, get ready to rumble — How rivalry promotes distinctiveness for brands and consumers
(2018)
Scholars typically advise brands to stay away from public conflict with competitors as research has focused on negative consequences - e.g., price wars, escalating hostilities, and derogation. This research distinguishes between rivalry between firms (inter-firm brand rivalry) and rivalry between consumers (inter-consumer brand rivalry). Four studies and six samples show both types of rivalry can have positive consequences for both firms and consumers. Inter-firm brand rivalry boosts perceived distinctiveness of competing brands independent of consumption, attitude, familiarity, and involvement. Inter-consumer brand rivalry increases consumer group distinctiveness, an effect mediated by brand identification and rival brand disidentification. We extend social identity theory by demonstrating that: 1) outside actors like firms can promote inter-consumer rivalry through inter-firm rivalry and 2) promoting such conflict can actually provide benefits to consumers as well as firms. The paper challenges the axiom “never knock the competition,” deriving a counter-intuitive way to accomplish one of marketing's premier objectives.
This study is concerned with the early stages of hydrogen embrittlement on an atomistic scale. We employed density functional theory to investigate hydrogen diffusion through the (100), (110) and (111) surfaces of γ-Fe. The preferred adsorption sites and respective energies for hydrogen adsorption were established for each plane, as well as a minimum energy pathway for diffusion. The H atoms adsorb on the (100), (110) and (111) surfaces with energies of ∼4.06 eV, ∼3.92 eV and ∼4.05 eV, respectively. The barriers for bulk-like diffusion for the (100), (110) and (111) surfaces are ∼0.6 eV, ∼0.5 eV and ∼0.7 eV, respectively. We compared these calculated barriers with previously obtained experimental data in an Arrhenius plot, which indicates good agreement between experimentally measured and theoretically predicted activation energies. Texturing austenitic steels such that the (111) surfaces of grains are preferentially exposed at the cleavage planes may be a possibility to reduce hydrogen embrittlement.
The effect of magnetism on hydrogen adsorption and subsurface diffusion through face-centred cubic (fcc) γ-Fe(0 0 1) was investigated using spin-polarised density functional theory (s-DFT). The non-magnetic (NM), ferromagnetic (FM), and antiferromagnetic single (AFM1) and double layer (AFMD) structures were considered. For each magnetic state, the hydrogen preferentially adsorbs at the fourfold site, with adsorption energies of 4.07, 4.12, 4.03 and 4.05 eV/H atom for the NM, FM, AFM1 and AFMD structures. A total barrier of 1.34, 0.90, 1.32 and 1.25 eV and a bulk-like diffusion barrier of 0.6, 0.2, 0.4 and 0.3 eV were calculated for the NM, FM, AFM1 and AFMD magnetic states. The Fe atoms nearest to the H atom exhibited a reduced magnetic moment, whereas the next-nearest neighbour Fe atoms exhibited a non-negligible local perturbation in the magnetic moment. The presence of magnetically ordered structures has a minimal influence on the minimum energy path for H diffusion through the lattice and on the adsorption of H atoms on the Fe(0 0 1) surface, but we computed a significant reduction of the bulk-like diffusion barriers with respect to the non-magnetic state of fcc γ-Fe.
We report the unambiguous detection of phenyl groups covalently attached to functionalised graphene using non-linear spectroscopy. Sum-frequency generation was employed to probe graphene on a gold surface after chemical functionalisation using a benzene diazonium salt. We observe a distinct resonance at 3064 cm1 which can clearly be assigned to an aromatic C–H stretch by comparison with a self-assembled monolayer on a gold substrate formed from benzenethiol. Not only does sum-frequency generation spectroscopy allow one to characterise functionalised graphene with higher sensitivity and much better specificity than many other spectroscopic techniques, but it also opens up the possibility to assess the coverage of graphene with functional groups, and to determine their orientation relative to the graphene surface.
In diesem Beitrag werden Spezifika der Hochschulen und Ausbildungseinrichtungen, die in der KIBA organisiert sind, mit ihren Studiengängen, Weiterbildungsprogrammen, Forschungsschwerpunkten und didaktischen Konzepten vorgestellt. Es wird gezeigt, wie diese Einrichtungen mit ihrer Berufungs- und Einstellungspolitik, strategischen Allianzen und übergeordneten fachlichen und politischen Zusammenschlüssen sowie mit der Profilierung ihrer Studiengänge auf neue Anforderungen des Marktes und der Berufspraxis reagieren. Berücksichtigt werden dabei Positionen und Strategien zur Digitalisierung aus der Politik sowie ihren Beratungsgremien, in der sich die Inhalte bibliotheks- und informationswissenschaftlicher Ausbildung und Forschung verorten lassen. Insgesamt wird deutlich, wie schwierig es heute ist zu definieren, was die Bibliotheks- und die Informationswissenschaft im Kern ausmacht, um im Spannungsfeld der Herausforderungen an wissenschaftliche und öffentliche Bibliotheken, den Anforderungen der Wirtschaft im Bereich Informations- und Wissensmanagement, der Digitalisierung und Langzeitarchivierung von Kulturerbe, um nur einige Felder zu nennen, Ausbildungsprogramme bedarfsgerecht zu profilieren und die bibliotheks- und informationswissenschaftlichen Institute, Fachbereiche und Ausbildungseinrichtungen politisch abzusichern und ausreichend mit Ressourcen auszustatten.
Mastitis is one of the most important diseases threatening modern dairy herds. The idea of fighting the disease through colonising the udder with lactic acid bacteria (LAB), thereby building a beneficial biofilm, is the base for a probiotic approach towards mastitis control. The purpose of this study was to screen 13 LAB strains (eleven wild strains, two ATCC strains) inhibitory to the growth of mastitis-causing pathogens for their in vitro ability to form a biofilm and to adhere to bovine glandular mammary epithelium in order to assess their probiotic potential. Furthermore, we aimed to gain knowledge about the chemical nature of the adhesins involved by subjecting the bacteria to various chemical and enzymatical pre-treatments. The biofilms were grown on hydrophilic glass and on hydrophobic polypropylene in de Man, Rogosa and Sharpe (MRS) broth and afterwards quantified with a crystal violet assay. Biofilm formation was observed in all strains. However, the extent strongly depended on the strain, surface charge and medium. The adhesion assay also revealed a strong strain dependency, but this trait was also present in all of the investigated LAB isolates. Depending on the strain, chemical or enzymatical pre-treatment revealed carbohydrate molecules as well as proteins and lipids to be crucial for the adhesion of LAB to epithelial cells. The seven strains showing the strongest biofilm formation and/or adhesion represent promising candidates for further investigation in order to develop a probiotic remedy for the treatment of mastitis. Still, their safety for consumers and patients as well as their capability to colonise the udder remain to be investigated in in vivo studies.
Material tests were performed on a rediscovered Klimt-artwork “Trompetender Putto”. We performed studies on the red colored spots, mainly taken from non-restored parts. MIMOS II Fe-57 Mössbauer spectroscopy (novelty in art-pigment analysis) mainly reveals haematite and crystallized goethite in red colors. Electron microscopy can identify various layers of the original and overpainting of an artwork. The number of layers fluctuates between three and four chemically painted areas. The portable X-ray fluorescence analysis enables to reduce the pigment list to containing mercury (cinnabar), lead, zinc, iron and titanium. Infrared-lightirradiation visualizes the different age of the pigments.
Objective
We aimed to investigate the proportion of young patients not returning to work (NRTW) at 1 year after ischemic stroke (IS) and during follow-up, and clinical factors associated with NRTW.
Methods
Patients from the Helsinki Young Stroke Registry with an IS occurring in the years 1994–2007, who were at paid employment within 1 year before IS, and with NIH Stroke Scale score ≤15 points at hospital discharge, were included. Data on periods of payment came from the Finnish Centre for Pensions, and death data from Statistics Finland. Multivariate logistic regression analyses assessed factors associated with NRTW 1 year after IS, and lasagna plots visualized the proportion of patients returning to work over time.
Results
We included a total of 769 patients, of whom 289 (37.6%) were not working at 1 year, 323 (42.0%) at 2 years, and 361 (46.9%) at 5 years from IS. When adjusted for age, sex, socioeconomic status, and NIH Stroke Scale score at admission, factors associated with NRTW at 1 year after IS were large anterior strokes, strokes caused by large artery atherosclerosis, high-risk sources of cardioembolism, and rare causes other than dissection compared with undetermined cause, moderate to severe aphasia vs no aphasia, mild and moderate to severe limb paresis vs no paresis, and moderate to severe visual field deficit vs no deficit.
Conclusions
NRTW is a frequent adverse outcome after IS in young adults with mild to moderate IS. Clinical variables available during acute hospitalization may allow prediction of NRTW.
Background: Discovery of antibiotics have helped to manage the devastating diseases. Presently, the antibiotic era is threatened by the emergence of high level of antibiotic resistance of important pathogens. Misuse of antibiotics poses a serious risk to infectious disease control. It is necessary to improve public awareness to bring a change in the behavior of consumers. Therefore, present study was undertaken to assess the existing knowledge, attitude and practices related to antibiotic usage among university students.
Methods: A cross-sectional study was carried out among students from Mumbai University, India during May-June 2017. 300 students were approached to participate in the study of which 250 agreed to participate (males: 117; females: 133). Pretested questionnaire was distributed and collected data was analyzed using IBM SPSS version 23.
Results: Substantial number (33% and 40%) participants were unaware about the differences in antibiotic-anti-inflammatory drugs and antibiotic-antipyretics respectively. 28% of the participants thought it is right to stop antibiotics only based on symptoms improvement. Sixty eight percent and seventy nine percent participants believed that antibiotics should always be prescribed to treat flu like symptoms and pneumonia respectively.
Conclusions: Participants demonstrated poor knowledge about antibiotics. Similarly, their attitude and practice toward antibiotic use was associated with misconceptions. An educational intervention can be introduced to make them aware about rational antibiotic practices.
Bereits zum dritten Mal in Folge nahm eine zehnköpfige Gruppe Studierender der Hochschule Hannover aus dem Vollzeit- sowie dem berufsbegleitenden Bachelor-Studiengang Informationsmanagement, in Begleitung zweier Dozentinnen, an der BOBCATSSS-Konferenz teil. Nachdem bisher ausschließlich auf der Hochschulwebseite und tagesaktuell im Blog über Erfahrungen und Erlebnisse während der drei BOBCATSSS-Exkursionen berichtet wurde, folgt hiermit nun ein zusammenhängender Beitrag über die diesjährige Konferenz vom 24. bis zum 26. Januar 2018 in Riga, Lettland. Die BOBCATSSS-Konferenz ist eine internationale Konferenz der Bibliotheks- und Informationswissenschaften. Im Gegensatz zu IFLA & Co wird sie fast ausschließlich von Studierenden wechselnder Universitäten in Europa ausgerichtet.
The properties of these carbon nanostructures are determined by the structure and orientation of the graphitic domains during pyrolysis of carbon precursors. In this work, we investigated systematically the impact of creep stress during the stabilization process on the cyclization and molecular orientation of polyacrylonitrile as well as the graphitized structure after high temperature carbonization. Therefore, polyacrylonitrile (PAN) is electrospun and then stabilized with and without application of creep stress at different temperatures. The effect of creep stress on cyclization was monitored via Fourier transform IR spectroscopy (FTIR) and it was found that the degree of cyclization varies with the application of creep stress during the initial stages of cyclization at low temperatures (190°C and 210°C) in contrast to cyclization done at higher temperature (230°C). Herman molecular orientation factor was evaluated by polarized FTIR for PAN nanofibers cyclized with and without creep stress at 230°C-10 h. Subsequently, carbonization was performed at 1000°C and 1200°C for nanofibers cyclized at 230°C-10 h. Our results from XRD and Raman spectroscopy shows that the degree of graphitization and ordering of graphitic domains was enhanced for PAN nanofibers that were creep stressed during the cyclization process, even though both PAN nanofibers cyclized with creep stress and without creep stress showed the same amount of cyclized material. This increased degree of graphitization can be tracked to application of creep stress during the stabilization process which obviously favors the formation of sp2-hybridized carbon planes in the carbonization process. This finding highlights the impact of mechanical stress linking the cyclization of PAN nanofibers to graphitization.
Our results will pave the way for a deeper understanding of mechano-chemical processes to fabricate well-aligned graphitic domains which improves the mechanical and electrical properties of CNFs.
Foucault im Jobcenter : Supervision in einem widersprüchlichen gesellschaftlichen Feld (Teil 2)
(2018)
Ziel dieses zweiten Teils ist eine ausführliche (struktur-)hermeneutische Rekonstruktion und Interpretation des Falles, den wir 2017 im ersten Teil dieses Artikels zur Illustration einer historischen, gesellschaftskritischen und makrosoziologischen Perspektive auf den Wandel der Arbeitswelt und den aktivierenden Sozialstaat verwendet hatten. Diese Perspektive tritt nun zugunsten biografischer, sozialwissenschaftlicher und pädagogischer sowie institutions- und organisationstheoretischer Interpretationen und Analysen des Feldes Jobcenter zurück. In ihm spiegeln sich die im ersten Teil beschriebenen Desintegrationsdynamiken wie in einem Brennglas wider. Die biografische Interpretation baut auf der Gestaltmehrdeutigkeit von Biografien nach Rosenthal auf, sie thematisiert die biografischen Übergänge, die eng mit der Bewältigung der Entwicklungsaufgaben korrelieren. Darüber hinaus werden sozialwissenschaftlich sowohl psychoanalytische als auch rollen-, habitus- und machttheoretische Aspekte eine wichtige Rolle spielen. In der institutions- und organisationstheoretischen Interpretation werden die Strukturen und das Beratungsverständnis der Jobcenter als gesellschaftliche Institution analysiert. Beratungswissenschaftlich und supervisionstheoretisch bedeutsam aus der Sicht der Autoren ist, dass sowohl Supervisor_innen als auch die Mitarbeitenden in den Jobcentern über biografietheoretische, sozialwissenschaftliche und sozial-pädagogischen Wissensbestände verfügen sollten, damit sie die komplexen, unverstandenen und aufgrund der Aktenlage häufig fragmentierten Biografien ihrer ‚Kund_innen‘ besser verstehen und beurteilen können. Nur dann scheint auch eine advokatorische Ethik greifen zu können, die das unverstandene Material nicht zu Ungunsten ihrer Klient_innen auslegt. Ziel dieses Artikels ist es, einen sozial- und strukturhermeneutischen Verstehenszugang in dieses für die Supervision interessante Feld zu eröffnen, der zugleich homologe Übertragungsmöglichkeiten in andere gesellschaftliche Felder ermöglichen kann.
Library of Congress Subject Headings (LCSH) are popular for indexing library records. We studied the possibility of assigning LCSH automatically by training classifiers for terms used frequently in a large collection of abstracts of the literature on hand and by extracting headings from those abstracts. The resulting classifiers reach an acceptable level of precision, but fail in terms of recall partly because we could only train classifiers for a small number of LCSH. Extraction, i.e., the matching of headings in the text, produces better recall but extremely low precision. We found that combining both methods leads to a significant improvement of recall and a slight improvement of F1 score with only a small decrease in precision.
Knowledge and attitude towards voluntary blood donation among students from Mumbai University
(2018)
Background: Blood is scarce; its demand far outweighs the supply. In addition to limited supply, the issue of safety especially with regard to the risk of transfusion transmissible infection is also an issue of utmost concern especially in the developing countries. Blood transfusion services in India have gained special significance in recent years and forms a vital part of national health care system. Voluntary Non-Remunerated Blood Donation (VNRBD) is the safest of all types of blood donations. One of the potential sources that can be tapped for blood donation is the young and physically fit students from educational institutions across India. Methods: A cross-sectional study was carried out among students from Mumbai University, India during May–June 2017. Two hundred and fifty students were approached to participate in the study of which 201 agreed to participate (males: 104; females: 97). Pretested questionnaire was distributed and collected data was analyzed using IBM SPSS version 23. Results: High number of participants agreed about encouraging general public about voluntary blood donation (96%; 193/201), lack of awareness about VBD in general public (82%; 164/201). But not a single participant was able to respond to the knowledge part of the questionnaire with 100% accuracy. Almost all the participants had correct knowledge about blood groups (98%; 196/201) and blood matching need (195/201; 97%). Conclusions: Participants showed good attitude but demonstrated poor knowledge about voluntary blood donation. Details about blood donation should be incorporated in the undergraduate curriculum and periodic awareness programs should be organized for students.