For a study of Lg, the wave discovered by Press and Ewing (1952), tlir records of some North American earthquakes were used. In the course of this study it became elear that it was essential for the nnderstanding of the nature of the Lg waves to know at what depth the earthquakes in which tliey were recorded originated, especially vihether their foci were above or below the Mohorovicic discontinuity. One of the shocks was the Helena shock of October 31, 1935 which is considered to Ite shallow. But the opinions vary as to one of the others, tlie strong Timiskaming earthquake of Noveniber 1, 1935. It was, therefore, attempted to redetermine the epicentre and depth of this earthquake. The tables of Jeffreys and Bullen, (J.-B.) (1940) were used, but it was soon found that there was a systematic deviation from thein. For distanees up to about 13, where ali the stations except one were contained witliin a sector of 120, the slope of tlie P time-curve was smaller than that of any J.-B. curve that would conform to the observations at great distanees. This as a inatter of fact could not cause surprise, for in later years velocitics of P waves greater tlian those corresponding to the J.-B. tables bave repeatedly been found for the layer immediately below tlie Mohorovicic discontinuity. Well observed blasts and rockbursts bave furnished data that are much more accurate than those obtainable from earthquakes.
In ammunition sunk into the sea off the Danish coasts two large explosions occurred. Records of the resulting shocks were obtained at Köbenhavn, Lund and Göttingen. These are discussed and compared with those of some mine-explosions and of the earthquake of Oct. 31. 1930, 23h. Some macroseismic evidence is given and the methods available for the evaluation of the energy of the shocks are discussed.
In taking a goal pursuit perspective into account, the present study examined associations between the context, process and outcome evaluation of an organizational health intervention (OHI) implemented within 29 teams in a hospital setting. In doing so, team climate for innovation as a context factor was measured at baseline (N = 529). Four to six weeks after baseline, N = 250 team representatives participated in a 4-day workshop. During the workshop employees formulated collective goals as action plans to be implemented in the nursing wards. Goal pursuit as a process factor was differentiated into (a) a motivational “goal setting” and (b) a volitional “goal striving” phase. The scale of outcome expectancy (measured after the fourth day of the workshop) was used as an indicator for the goal setting phase. For the operationalization of the goal striving phase, action plans were coded with regard to the proportion of formulated implementation intentions (“if-then plans”). After 6 months, the outcome of the intervention was measured on a retrospective impact scale (N = 385). The results of the multiple regression analysis and of the multilevel analysis show that both team climate and goal pursuit (outcome expectancy and the proportion of if-then plans) were positively related to the perceived impact of the intervention. Furthermore, the results show that the relationship between team climate and the impact of the intervention was mediated by outcome expectancy. The results highlight the contribution of goal theory within context-process-outcome research that leads to a better understanding of when and why OHIs are effective.
DOI : 10.3389/fpsyg.2019.00154 Anahtar Kelimeler :
organizational health intervention, context, process, goal pursuit, implementation intentions, healthcare
ISSN: 1664-1078 Cilt: 10
Rotating instabilities (RI) have been observed in axial flow fans, centrifugal compressors as well as in low-speed and high-speed axial compressors. They are responsible for the excitation of high amplitude rotor blade vibrations and noise generation. This flow phenomenon moves relative to the rotor blades and causes periodic vortex separations at the blade tips and an axial reversed flow through the tip clearance of the rotor blades.\n The paper describes experimental investigations of RI in the Dresden Low-Speed Research Compressor (LSRC). The objective is to show that the fluctuation of the blade tip vortex is responsible for the origination of this flow phenomenon.\n RI have been found at operating points near the stability limit of the compressor with relatively large tip clearance of the rotor blades. The application of time-resolving sensors in both fixed and rotating frame of reference enables a detailed description of the circumferential structure and the spatial development of this unsteady flow phenomenon, which is limited to the blade tip region.\n Laser-Doppler-Anemometry (LDA) within the rotor blade passages and within the tip clearance as well as unsteady pressure measurements on the rotor blades show the structure of the blade tip vortex.\n It will be shown that the periodical interaction of the blade tip vortex of one blade with the flow at the adjacent blade is responsible for the generation of a rotating structure with high mode orders, termed as rotating instability (RI).
DOI : 10.1115/2000-gt-0506
Doküman etkinliği: Etkinlik adı: ASME Turbo Expo 2000: Power for Land, Sea, and Air Etkinlik yeri: Munich, Germany Etkinlik sponsoru: International Gas Turbine Institute Etkinlik başlangıç tarihi: [2000,5,8] Etkinlik başlangıç tarihi: [2000,5,11]