Search results for "void"
showing 10 items of 435 documents
Refluxdiagnostik – Stellenwert des Miktionszystourethrogramms
2019
ZusammenfassungDas radiologische Miktionszystourethrogramm gilt in der Kinderurologie seit Langem als Goldstandard zur Refluxprüfung. In den zurückliegenden Jahrzehnten haben sich daneben zusätzliche kontrastmittelgestützte Verfahren wie die sonografische Refluxprüfung oder die Radionuklidzystografie etabliert. Ihr Hauptindikationsgebiet liegt in der Reflux-Diagnostik nach Pyelonephritis im Säuglings- und Kindesalter. Für die Auswahl der geeigneten Methode spielen klinische Fragestellung, Verfügbarkeit, ökonomische Aspekte, personeller und zeitlicher Aufwand und das Ziel der geringstmöglichen Strahlenbelastung bei maximalem Informationsgehalt eine Rolle. Moderne Strategien streben unabhängi…
Können Unterschiede in Stresswahrnehmung und -bewältigung Geschlechtsunterschiede in der depressiven Symptombelastung bei Jugendlichen erklären?
2001
Zusammenfassung: Die vorliegende Längsschnittstudie untersucht den differentiellen Beitrag von Belastung, Bewältigung und sozialen Beziehungen zur Erklärung depressiver Symptombelastung im Jugendalter. 101 weibliche und 89 männliche Jugendliche nahmen an vier jährlichen Erhebungswellen teil, in denen depressive Symptome, Alltagsbelastungen, Konflikte mit Eltern und Freunden, der Copingstil sowie das Selbstkonzept untersucht wurden. Im Alter von 14 Jahren wurden bei weiblichen im Vergleich zu männlichen Jugendlichen ein höheres Ausmaß an Alltagsstressoren, mehr Konflikte in der Beziehung zur Mutter sowie mehr vermeidendes Coping festgestellt; männliche Jugendliche wiesen zu allen Messzeitpu…
Psychologische Operationsvorbereitung, Stressbewältigung und perioperativer Status
2008
Zusammenfassung. In Studien zum Einfluss einer psychologischen Operationsvorbereitung auf den postoperativen Anpassungsstatus von Patienten wurde bislang einer möglichen Interaktion der Art der Vorbereitung mit Persönlichkeitsmerkmalen des Patienten nur wenig Beachtung geschenkt. Ziel der vorliegenden Arbeit ist die Analyse von Wechselwirkungen zwischen unterschiedlichen Formen der psychologischen Operationsvorbereitung und bestimmten Merkmalen des Patienten im Hinblick auf subjektive und objektive Indikatoren der perioperativen Patientenbelastung. In einer Untersuchung an 97 chirurgischen Patienten (Nasennebenhöhlen- oder Septumoperationen; 66 Männer und 31 Frauen) konnte nachgewiesen wer…
Efectos conductuales y neuroquímicos del consumo de éxtasis y cocaína en ratones adolescentes.
2009
La 3,4-metilendioximetanfetamina (MDMA), una sustancia popularmente conocida como éxtasis, es una droga ilícita consumida habitualmente por adolescentes y adultos jóvenes. Además, el policonsumo es una práctica habitual entre los usuarios de la MDMA, siendo la cocaína una de las drogas más frecuentemente asociadas a esta sustancia. El objetivo del presente trabajo fue evaluar los efectos a corto y largo plazo que se producen tras la administración de la MDMA (5, 10, o 20 mg/kg) sola o en combinación con cocaína (25 mg/kg) en ratones adolescentes. En el estudio sobre el efecto agudo, observamos que ambas drogas administradas individual o simultáneamente incrementan la actividad motora. La do…
Adaptive Collision Avoidance through Implicit Acknowledgments in WSNs
2008
The large number of nodes, typical of many sensor network deployments, and the well-known hidden terminal problem make collision avoidance an essential goal for the actual employment of WSN technology. Collision avoidance is traditionally dealt with at the MAC Layer and plenty of different solutions have been proposed, which however have encountered limited diffusion because of their incompatibility with commonly available devices.In this paper we propose an approach to collision avoidance which is designed to work over a standard MAC Layer, namely the IEEE 802.15.4 MAC, and is based on application-controlled delays of packet transmission times. The proposed scheme is simple, decentralized …
Cooperative RTS/CTS MAC with relay selection in distributed wireless networks
2009
This paper proposes a cooperative multiple access protocol based on the Distributed Coordination Function (DCF) Request-To-Send/Clear-To-Send (RTS/CTS) scheme for distributed wireless networks. It answers three key questions concerning cooperation from the network perspective, namely when to cooperate, whom to cooperate with and how to protect cooperative transmissions. According to our protocol, the cooperation is initiated only if the direct transmission fails. An optimal relay node is selected in a distributed manner according to instantaneous relay channel conditions without prior information or extra signaling among relay candidates in the network. An additional three-way handshake is …
Revisit of RTS/CTS Exchange in High-Speed IEEE 802.11 Networks
2005
IEEE 802.11 medium access control (MAC), called distributed coordination function (DCF), provides two different access modes, namely, 2-way (basic access) and 4-way (RTS/CTS) handshaking. The 4-way handshaking has been introduced in order to combat the hidden terminal phenomenon. It has been also proved that such a mechanism can be beneficial even in the absence of hidden terminals, because of the collision time reduction. We analyze the effectiveness of the RTS/CTS access mode, in current 802.11b and 802.11a networks. Since the rates employed for control frame transmissions can be much lower than the rate employed for data frames, the assumption on the basis of the 4-way handshaking introd…
The Line: committing and commemorating ‘the crime without a name’
2018
This article analyses Gina Shmukler’s verbatim play The Line (2012) and argues for another look at the testimonies captured from witnesses, survivors and perpetrators of the violence targeting foreign and perceived as foreign persons in South Africa that escalated in 2008 and in 2015. It is a narrative analysis of the play that uses Gregory H. Stanton’s Ten Stages of Genocide model and the United Nations Convention on Genocide to investigate the theatrical representation of the violence. This account argues that the events that are captured in the play and that inspired it should be reconsidered as acts of genocide. In the absence of an official acknowledgement of the events as genocide, pe…
Grouping facilitates avoidance of parasites by fish
2013
Background. Parasite distribution is often highly heterogeneous, and intensity of infection depends, among other things, on how well hosts can avoid areas with a high concentration of parasites. We studied the role of fish behaviour in avoiding microhabitats with a high infection risk using Oncorhynchus mykiss and cercariae of Diplostomum pseudospathaceum as a model. Spatial distribution of parasites in experimental tanks was highly heterogeneous. We hypothesized that fish in groups are better at recognizing a parasitized area and avoiding it than solitary fish. Methods. Number of fish, either solitary or in groups of 5, was recorded in different compartments of a shuttle tank where fish co…
How do individual attachment patterns of both members of couples affect their perceived infertility stress? An actor–partner interdependence analysis
2016
Abstract There exists a lack of dyadic research examining how the attachment characteristics of infertile individuals influence their experience of infertility-related distress. The actor partner interdependence model was used to test a theoretical model by examining whether both infertile wives and husbands, who display high levels of attachment avoidance and/or attachment anxiety, will experience infertility-related distress. Seven hundred and seventy individuals (385 couples) completed the experience in close relationships, the fertility problem inventory, and the state-trait anxiety inventory prior to infertility treatment. Wives' distress was predicted by their own and by their husband…