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排序方式: 共有179条查询结果,搜索用时 15 毫秒
1.
In this article, the authors study the factorial structure of 2 versions (64 items and 32 items) of the Dutch translation of the Inventory of Interpersonal Problems (IIP; L. M. Horowitz, L. E. Alden, J. S. Wiggins, & A. L. Pincus, 2000) in both a clinical sample (n = 382) and a student sample (n = 287). First, the authors test whether both inventories are constituted by correlated uni-dimensional subscales, and they conclude that this is true only for the short version. Second, the authors study whether the correlations between the subscales follow a circumplex pattern. This proves to be true for both versions. Coefficients alpha and correlations between the IIP-64 and IIP-32 subscales are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
2.
Fast simulation (e.g., real-time) of flexible multibody systems is typically restricted by the presence of both differential
and algebraic equations in the model equations, and the number of degrees of freedom required to accurately model flexibility.
Model reduction techniques can alleviate the problem, although the classically used body-level model reduction and general-purpose
system-level techniques do not eliminate the algebraic equations and do not necessarily result in optimal dimension reduction.
In this research, Global Modal Parametrization, a model reduction technique for flexible multibody systems is further developed
to speed up simulation of flexible multibody systems. The reduction of the model is achieved by projection on a curvilinear
subspace instead of the classically used fixed vector space, requiring significantly less degrees of freedom to represent
the system dynamics with the same level of accuracy. The numerical experiment in this paper illustrates previously unexposed
sources of approximation error: (1) the rigid body motion is computed in a forward dynamical analysis resulting in a small
divergence of the rigid body motion, and (2) the errors resulting from the transformation from the modal degrees of freedom
of the reduced model back to the original degrees of freedom. The effect of the configuration space discretization coarseness
on the different approximation error sources is investigated. The trade-offs to be defined by the user to control these approximation
errors are explained. 相似文献
3.
Eline Saenen Nele Horemans Nathalie Vanhoudt Hildegarde Vandenhove Geert Biermans May Van Hees Jean Wannijn Jaco Vangronsveld Ann Cuypers 《International journal of molecular sciences》2015,16(6):12405-12423
To evaluate the environmental impact of uranium (U) contamination, it is important to investigate the effects of U at ecologically relevant conditions. Since U speciation, and hence its toxicity, strongly depends on environmental pH, the present study aimed to investigate dose-dependent effects of U at pH 7.5. Arabidopsis thaliana plants (Mouse-ear Cress) were exposed for three days to different U concentrations at pH 7.5. In the roots, the increased capacities of ascorbate peroxidase and glutathione reductase indicate an important role for the ascorbate-glutathione cycle during U-induced stress. However, a significant decrease in the ascorbate redox state was observed after exposure to 75 and 100 µM U, indicating that those roots are severely stressed. In accordance with the roots, the ascorbate-glutathione cycle plays an important role in the antioxidative defence systems in A. thaliana leaves exposed to U at pH 7.5 as the ascorbate and glutathione biosynthesis were upregulated. In addition, small inductions of enzymes of the antioxidative defence system were observed at lower U concentrations to counteract the U-induced stress. However, at higher U concentrations it seems that the antioxidative defence system of the leaves collapses as reductions in enzyme activities and gene expression levels were observed. 相似文献
4.
Eline Pottie Jolien Storme Christophe P. Stove 《International journal of molecular sciences》2022,23(7)
The P2Y2 receptor (P2Y2R) is a G protein-coupled receptor that is activated by extracellular ATP and UTP, to a similar extent. This allows it to play roles in the cell’s response to the (increased) release of these nucleotides, e.g., in response to stress situations, including mechanical stress and oxygen deprivation. However, despite its involvement in important (patho)physiological processes, the intracellular signaling induced by the P2Y2R remains incompletely described. Therefore, this study implemented a NanoBiT® functional complementation assay to shed more light on the recruitment of β-arrestins (βarr1 and βarr2) upon receptor activation. More specifically, upon determination of the optimal configuration in this assay system, the effect of different (receptor) residues/regions on βarr recruitment to the receptor in response to ATP or UTP was estimated. To this end, the linker was shortened, the C-terminal tail was truncated, and phosphorylatable residues in the third intracellular loop of the receptor were mutated, in either singly or multiply adapted constructs. The results showed that none of the introduced adaptations entirely abolished the recruitment of either βarr, although EC50 values differed and time-luminescence profiles appeared to be qualitatively altered. The results hint at the C-terminal tail modulating the interaction with βarr, while not being indispensable. 相似文献
5.
Based on an experimental programme, including autogenous shrinkage tests on concrete, ultrasonic monitoring of fresh concrete, and mercury intrusion porosimetry, the influence of the filler type on the autogenous shrinkage of self-compacting concrete has been investigated. The onset of percolating structure formation (time zero) is influenced by the filler type due to a possible accelerating effect of the filler on the cement hydration. Limestone filler accelerates the hydration process, and reduces time zero, while this is not the case when using quartzite filler. Using fly ash, showing only a slight acceleration, a slight reduction of time zero is obtained. A very significant swelling peak is noticed during the first day. This swelling peak is not a measuring artefact, but is caused mainly by water absorption on the filler surface and resulting disjoining pressure. Some part of the swelling peak might also be caused by Ca(OH)2 crystallisation. The fineness of the filler is an important factor for this swelling behaviour, although also the nature of the filler seems to have an influence. The superplasticiser also interacts with the fillers, influencing the swelling behaviour. The different filler types used in this study did not lead to significant differences in critical pore diameter of the microstructure. This might explain why no significant differences have been found in final autogenous shrinkage values using the different filler types. 相似文献
6.
Motivational profiles from a self-determination perspective: The quality of motivation matters. 总被引:2,自引:0,他引:2
Vansteenkiste Maarten; Sierens Eline; Soenens Bart; Luyckx Koen; Lens Willy 《Canadian Metallurgical Quarterly》2009,101(3):671
The present research complements extant variable-centered research that focused on the dimensions of autonomous and controlled motivation through adoption of a person-centered approach for identifying motivational profiles. Both in high school students (Study 1) and college students (Study 2), a cluster analysis revealed 4 motivational profiles: a good quality motivation group (i.e., high autonomous, low controlled); a poor quality motivation group (i.e., low autonomous, high controlled); a low quantity motivation group (i.e., low autonomous, low controlled); and a high quantity motivation group (i.e., high autonomous, high controlled). To compare the 4 groups, the authors derived predictions from qualitative and quantitative perspectives on motivation. Findings generally favored the qualitative perspective; compared with the other groups, the good quality motivation group displayed the most optimal learning pattern and scored highest on perceived need-supportive teaching. Theoretical and practical implications of the findings are discussed. (PsycINFO Database Record (c) 2010 APA, all rights reserved) 相似文献
7.
P. Gajdatsy K. Janssens Wim Desmet H. Van der Auweraer 《Mechanical Systems and Signal Processing》2010,24(7):1963-1976
In recent years, there has been a renewed interest in developing faster and simpler transfer path analysis (TPA) methods. A dominant class of these new approaches, often referred to as Operational Path Analyses (OPA), is designed to achieve this goal by using only operational data in conjunction with the application of the transmissibility concept. Despite the reduction in measurement time and complexity, these suffer from a number of limitations, such as problems related to the estimation of transmissibility, or the unreliability of the results due to cross-coupling between path inputs, etc., which makes them prone to errors. Some of these only apply to one specific method, while others are common to all transmissibility based approaches. The goal of this paper is to identify and describe these limitations and point out the potential dangers of applying such methods without taking these into account. 相似文献
8.
On the Use of Calcium Fluoride as an Infrared-Transparent First Body for In Situ Temperature Measurements in Sliding Contact 总被引:1,自引:0,他引:1
This article presents an investigation of the temperature changes in dry sliding contact for braking applications. An original
metrology method was developed using a special pad with a calcium fluoride ‘window’ in its centre. As calcium fluoride is
transparent to infrared radiation (up to 92% in 1–5 μm spectra), it allows access to the disc surface during friction for
estimating its temperature using a two-colour pyrometer. Using this set-up, the surface temperature of the disc was successfully
determined during friction. In addition, the temperature in the contact area was compared to that measured immediately outside
the contact area; the difference between them proved to be very minimal (<5%). The effect of introducing a calcium fluoride
‘window’ on friction was also studied, and the results show that its use does not affect the friction coefficient. Finally,
the wear mechanisms of the calcium fluoride were studied through the characterisation of the worn surfaces using several techniques. 相似文献
9.
Wouter R. A. Ryckaert Jozef A. L. Ghijselen Jan J. M. Desmet Alex P. M. Van den Bossche Jan A. A. Melkebeek David M. Van de Sype 《Electrical Engineering (Archiv fur Elektrotechnik)》2005,87(6):315-326
Although complete compensation is only possible using true active filters, resistive shunt harmonic impedances (SHI) have
been shown to provide a considerable reduction of the harmonic propagation.
In this paper, the harmonic mitigation potential of a resistive SHI is discussed concerning its influence on the voltage distortion
profile along a typical distribution feeder, with the location of the SHI along the feeder as a parameter. Although the distortion values
are dependent on the SHI location, it is shown that the end of the feeder is generally a good location to install the SHI,
especially when the power system parameters can vary or are unknown.
Calculations are performed on a typical radial distribution feeder. Both the power factor correction capacitors and the non-linear
loads are concentrated in single nodes. The linear loads are disconnected to obtain the worst case for the voltage distortion.
Also some measurements on a scale model of a typical distribution feeder are done and the experimental results confirm the
results obtained from simulations. 相似文献
10.
We explore the possibility of generating high-velocity flows of nanoparticles through flat-rectangular nanochannels, which are only 50% deeper than the diameter of the particles. Using the shear-driven flow principle, 200-nm particles can, for example, be transported through a 300-nm-deep channel at velocities up to 35 mm/s (upper limit of our current setup). Working under high-pH conditions, the velocity of the carboxylated nanoparticles still respects the small-molecule velocity law, despite the high degree of confinement to which the particles are subjected. The high degree of confinement is also found to lead to a reduced band broadening. When injecting sharply delimited particle plugs, the plate heights observed for the flow of 0.2-microm particles through a 0.3-microm channel (with plate heights of the order of 1-2 microm) are, for example, approximately 1 order of magnitude smaller than for the flow of 1.0-microm particles through a 1.4-microm channel. It is also found that the band broadening is, within its statistical variation, independent of the fluid velocity over a large range of particle velocities (5-35 mm/s). The flow method distinguishes itself from pressure-driven field-flow fractionation and hydrodynamic chromatography in that the mean particle velocity is independent of the particle size over the entire range of possible particle to channel diameter ratios. 相似文献