SearchSkip to Search Results
- 4Hacke, U.G.
- 2 Feild, Taylor S.
- 2 Pittermann, Jarmila
- 2 Sano, Yuzou
- 2 Sikkema, Elzard H.
- 2Hacke, Uwe G.
Adaptation of trembling aspen and hybrid poplars to frost and drought: implications for selection and movement of planting stock in western CanadaDownload
This study contains a series of experiments to evaluate growth performance and survival of hybrid poplars (Populus spp.) and trembling aspen (Populus tremuloides Michx.) in boreal planting environments in western Canada. Ecophysiological traits related to drought resistance and winter survival...
To overcome the challenges of low recovery of fine particles in flotation processes, designing a cavitating device that can enhance the recovery has been a major topic of study. In the design of a cavitating device, the bubble/bubble interactions, bubble response to the change of local pressure,...
Ductile and brittle failure behaviors of semi-crystalline polymers such as high density polyethylene (HDPE) were investigated under uni-axial tensile loading at various test conditions. The first part of the thesis examines the influence of aspect ratio of rectangular cross-section on the...
Variation in xylem structure and function has been extensively studied across different species with a wide taxonomic, geographical and ecological coverage. In contrast, our understanding of how xylem of a single species can adjust to different growing conditions remains limited. In this thesis,...
•Intensive forestry systems and breeding programs often include either native aspen or hybrid poplar clones, and performance and trait evaluations are mostly made within these two groups. Here, we assessed how traits with potential adaptive value varied within and across these two plant groups....
The main objective of the present study is to experimentally and numerical studies of hydrodynamic cavitation phenomenon in the Venturi tubes, in order to validate and further develop numerical multiphase flow models with the obtained data. To achieve this, a visible experimental set-up was...
Heterogeneous distribution of pectin epitopes and calcium in different pit types of four angiosperm speciesDownload
Intervessel pits act as safety valves that prevent the spread of xylem embolism. Pectin–calcium crosslinks within the pit membrane have been proposed to affect xylem vulnerability to cavitation. However, as the chemical composition of pit membranes is poorly understood, this hypothesis has not...
Influence of Venturi Tube Geometry and Particle Properties on the Hydrodynamic Cavitation for Fine Particle FlotationDownload
In this study, the influences of both Venturi tube geometry and particle properties on the hydrodynamic cavitation are investigated. In the geometry study, we investigated numerically and experimentally the influence of several geometrical parameters on the cavitation inception and bubble...
The standard centrifuge method accurately measures vulnerability curves of longvesselled olive stemsDownload
The standard centrifuge method has been frequently used to measure vulnerability to xylem cavitation. This method has recently been questioned. It was hypothesized that open vessels lead to exponential vulnerability curves, which were thought to be indicative of measurement artifact. We tested...
Two structure‐function hypotheses were tested for vesselless angiosperm wood. First, vesselless angiosperm wood should have much higher flow resistance than conifer wood because angiosperm tracheids lack low‐resistance torus‐margo pits. Second, vesselless wood ought to be exceptionally safe from...