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  • 11
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Organometallics 12 (1993), S. 3671-3676 
    ISSN: 1520-6041
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 12
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 27 (1979), S. 709-712 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 13
    ISSN: 1432-1769
    Keywords: Key words:Computer vision – Stereo matching – Surface reconstruction – DTM generation – Interactive editing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract. This paper presents a new multi-pass hierarchical stereo-matching approach for generation of digital terrain models (DTMs) from two overlapping aerial images. Our method consists of multiple passes which compute stereo matches with a coarse-to-fine and sparse-to-dense paradigm. An image pyramid is generated and used in the hierarchical stereo matching. Within each pass, the DTM is refined by using the image pyramid from the coarse to the fine level. At the coarsest level of the first pass, a global stereo-matching technique, the intra-/inter-scanline matching method, is used to generate a good initial DTM for the subsequent stereo matching. Thereafter, hierarchical block matching is applied to image locations where features are detected to refine the DTM incrementally. In the first pass, only the feature points near salient edge segments are considered in block matching. In the second pass, all the feature points are considered, and the DTM obtained from the first pass is used as the initial condition for local searching. For the passes after the second pass, 3D interactive manual editing can be incorporated into the automatic DTM refinement process whenever necessary. Experimental results have shown that our method can successfully provide accurate DTM from aerial images. The success of our approach and system has also been demonstrated with a flight simulation software.
    Type of Medium: Electronic Resource
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  • 14
    ISSN: 1432-1106
    Keywords: Key words Perinatal asphyxia ; Apoptosis ; Necrosis ; Hematoxylin-eosin ; DNA fragmentation ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  The consequences of perinatal asphyxia on the rat brain were studied 80 min to 8 days after birth with hematoxylin-eosin and in situ DNA double-strand-breaks labeling histochemistry. Asphyxia was induced by immersing fetus-containing uterus horns, removed from ready-to-deliver Sprague-Dawley rats, in a water bath at 37°C for various time periods (0–22 min). Spontaneous- and cesarean-delivered pups were used as controls. Perinatal asphyxia led to a decrease in the rate of survival, depending upon the length of the insult. No gross morphological changes could be seen in the brain of either control or asphyctic pups at any of the studied time points after delivery. However, in all groups, nuclear chromatin fragmentation, corresponding to in situ detection of DNA fragmentation, was observed at different stages. Nuclear fragmentation in control pups showed a specific distribution that appeared to be related to brain maturation, thus indicating programmed cell death. A progressive and delayed increase in nuclear fragmentation was found in asphyctic pups, which was dependent upon the length of the perinatal insult. The most evident effect was seen in frontal cortex, striatum, and cerebellum at postnatal day 8, although changes were also found in ventral-posterior thalamus, at days 1 and 2. Thus, nuclear chromatin fragmentation in asphyctic pups indicates a delayed post-asphyctic neuronal death. The absence of signs of inflammation or necrosis suggests that delayed neuronal cell death following perinatal asphyxia is an active, apoptosis-like phenomenon.
    Type of Medium: Electronic Resource
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  • 15
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 995-1002 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: An Al-3.43Cu-1.28Li-0.49Mg-0.12Zr containing 0.62Zn and 0.29Mn was designed andthe microstructures and mechanical properties of the alloy with various heat treatments wereinvestigated. The precipitates of the alloy consist of T1 (Al2CuLi), θ′ (Al2Cu)[removed info]σ (Al5Cu6Mg2) and δ′(Al3Li). As solution temperature is changed from 485°C to 530°C, the solution degree of alloyingelements in alloy increased, the amount of T1 in the alloy aged at 160°C for 18 h increased and that ofθ′ is decreased, resulting in an increase of strength. After solution treatment at 530°C, the alloy agedfor 18 h at 145°C is mainly strengthened by G P zones, and a little amount of T1 precipitates. As agingtemperature is increased to 160°C and 175°C, the strength increased, due to the sufficientprecipitation of σ and T1. The smaller amount of T1 in the alloy aged at 190°C is consistent with itslower strength. Meanwhile, it is found that the σ precipitate does not coarsen as aging temperatureincreases in the range from 160°C to 190°C
    Type of Medium: Electronic Resource
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  • 16
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 253-256 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microstructure evolution and mechanical properties of an AZ61 Mg alloy processed bycyclic extrusion compression were investigated. It is shown that CEC process may be appliedsuccessfully to AZ61 Mg alloys, and this leads to excellent grain refinement with grain size of ~0.8μmafter 15 passes at 573K and to significant improvements in yield strength, ductility and hardness ofAZ61 materials with slight compressive strength decreases. Dislocations were induced at initial stageof CEC process, and with increased deformation, tangled dislocations developed to form dislocationboundaries and subgrain boundaries, and then evolved into low angle grain boundaries (LAGBs) andhigh angle grain boundaries (HAGBs) which was regarded as continuous dynamic recovery andrecrystallization (CDRR)
    Type of Medium: Electronic Resource
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  • 17
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 584-586 (June 2008), p. 523-527 
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Cyclic extrusion compression (CEC) is an effective severe plastic deformation (SPD)process which can be used for fabricating ultrafine grained light materials such as magnesium alloys.This method introduces three-dimensional compression and shear stresses and the process can berepeated for a certain number of passes until the desired accumulated strain has been introduced. Inorder to reveal the effect of second phases on the microstructure developed in magnesium alloysduring CEC, three different alloys (AZ31, AZ31-1wt.%Si and AZ91) were investigated after CEC 7passes performed at 225°C. The experimental results show that the CEC process can effectivelyrefine the microstructures of these alloys and the mean grain size achieved is 1.3µm, 1.5µm and1.4µm, respectively. It is revealed that the grain size, grain shape and grain boundary structures arelittle affected by coarse phase Mg2Si but strongly affected by the fine phase Mg17Al12. The finephase Mg17Al12 seems to increase the relative grain misorientations, hence enhancing the formationof high angle grain boundaries (HAGBs). It is expected that such changes are improvingmechanical properties, subsequent forming behavior and surface quality
    Type of Medium: Electronic Resource
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  • 18
    ISSN: 0894-9166
    Keywords: thermal stresses ; temperature fields ; interior ballistics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The transient temperature fields and dynamic thermal stress fields in gun barrel are studied in this paper, which are problems of interior ballistics. The high blast temperature and pressure act simultaneously on the inner surface of the barrel behind projectile moving in the barrel during shooting. Under this boundary condition, the governing equations of the thermoelastic problems of hollow cylinder are given, the corresponding functional is studied and the numerical results calculated by the finite element method are obtained.
    Type of Medium: Electronic Resource
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  • 19
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 340-349 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a new dynamical derivation of the approximation used by Thompson, Schweizer, and Chandler and by Høye and Stell for the frequency dependent polarizability of a quantum fluid with harmonically bound dipole moments; the Drude model. The derivation is the same for classical and quantum liquids—as is of course the result which agrees with that of these authors. We then refine the theory by taking account of the limited number of energy levels available, i.e., we replace the harmonic approximation by a two level approximation, for the target atom. This leads to a prefactor ω0I/ω0 in the line shift of an impurity atom in a fluid computed by Chandler, Schweitzer, and Wolynes: ω0 and ω0I being the characteristic frequencies of the fluid and impurity atoms, respectively. This factor improves the agreement between theory and experiment, especially those of Nowak and Bernstein on benzene in argon and some other liquids. We also compute the line shapes of the impurity atom by Monte Carlo simulations and obtain reasonable agreement with experimental observations.
    Type of Medium: Electronic Resource
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  • 20
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 9084-9091 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monte Carlo simulations are conducted to investigate a model composed of a fluctuating sphere labeled on one chain end of an isolated flexible chain polymer in good solvents. The labeled sphere is to model the instantaneous size of a bound flexible chain segment or a vibrating chromophore on a polymer chain. We assume the vibration of the sphere is governed by a harmoniclike potential, and the sphere size stays positive. We first address the issue regarding the confinement effect induced by a flexible chain. To rationalize the simulation results, we carry out a detailed analysis for a simple case containing a dimer grafted onto a fluctuating sphere. Using the sphere with a large size fluctuation, we find that the fluctuating sphere can be confined within the coiled polymer chain, and even trapped inside the grooves between neighboring monomers. The results imply the confinement effects may influence the properties of chromophores labeled on polymers or drugs bound to biopolymers. Moreover, in a separate study, we show the fluctuating sphere model can be used to fit a bound flexible chain segment, and provides a means to parameterize a polymer chain to a dumbbell, with possible applications in the dynamics of dilute polymer solutions. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
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