Bending Redistribution
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Mechanical Mechanism Analysis and Influencing Factors of Subway Cross Passage Construction
Abstract The construction of the cross passage changes the main tunnels segment from a complete cylindrical structure to a notched unstable stressed structure. Thus, the overall force (bending and shearing) performance of the main tunnels is considerably decreased. The excavation of the cross passage also destroys the stability of the original soil layer and
Lat. Am. j. solids struct.. Publicado em: 01/07/2019
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2. Residual stress analysis of drive shafts after induction hardening
Typically, for automotive shafts, shape distortion manifests itself in most cases after the induction hardening by an effect known as bending. The distortion results in a boost of costs, especially due to machining parts in the hardened state to fabricate its final tolerances. In the present study, residual stress measurements were carried out on automotive
Mat. Res.. Publicado em: 03/06/2014
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3. Momentos fletores negativos nos apoios de lajes formadas por vigotas de concreto protendido / Bending moments in the support of slabs made by precast prestressed concrete joist
This work aims the structural analysis in a type of slabs that is increasing its utilization in Brazil. These slabs are made by precast prestressed joists. The main objective of this work is the evaluation of the behavior of this type of slabs by theoretical analysis of the bending moments on the supports of continuous slabs. In the theoretical analysis was
Publicado em: 2002
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4. Bending moments in the support of slabs made by precast joist with lattice reinforcement. / Estudo dos momentos fletores negativos nos apoios de lajes formadas por elementos pré-moldados tipo nervuras com armação treliçada.
This work deal with an usual type of slab in Brazil: slabs made by precast joist with lattice reinforcement. The goal of this work is the structural analysis of bending moments in the supports of slabs made by this kind of precast element. Theoretical and experimental models analyze this type of slab. In the theoretical analysis, the non-linear concrete beha
Publicado em: 2001
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5. Blue light regulates an auxin-induced K+-channel gene in the maize coleoptile
Auxin redistribution along gravistimulated maize coleoptiles causes differential expression of the auxin-induced K+-channel gene ZMK1 (Zea mays K+ channel 1) and precedes the curvature response. To evaluate the role of ZMK1 during phototropism, we here investigated blue light-stimulated coleoptiles. Four hours of blue light stimulation resulted in phototropi
National Academy of Sciences.
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6. Nitric Oxide Mediates Gravitropic Bending in Soybean Roots1[w]
Plant roots are gravitropic, detecting and responding to changes in orientation via differential growth that results in bending and reestablishment of downward growth. Recent data support the basics of the Cholodny-Went hypothesis, indicating that differential growth is due to redistribution of auxin to the lower sides of gravistimulated roots, but little is
American Society of Plant Biologists.
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7. Epinasty of Poinsettias—the Role of Auxin and Ethylene
Upward physical restraint of the normally horizontal bracts of poinsettia (Euphorbia pulcherrima Willd.) resulted in increased ethylene production and epinastic curvature of the petioles after 5 days. Downward restraint caused little change in ethylene production or epinasty, indicating that the enhanced ethylene production observed in petioles bent upwards
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8. Auxin-induced K+ channel expression represents an essential step in coleoptile growth and gravitropism
Auxin-induced growth of coleoptiles depends on the presence of potassium and is suppressed by K+ channel blockers. To evaluate the role of K+ channels in auxin-mediated growth, we isolated and functionally expressed ZMK1 and ZMK2 (Zea mays K+ channel 1 and 2), two potassium channels from maize coleoptiles. In growth experiments, the time course of auxin-indu
The National Academy of Sciences.
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9. A Role for Inositol 1,4,5-Trisphosphate in Gravitropic Signaling and the Retention of Cold-Perceived Gravistimulation of Oat Shoot Pulvini1
Plants sense positional changes relative to the gravity vector. To date, the signaling processes by which the perception of a gravistimulus is linked to the initiation of differential growth are poorly defined. We have investigated the role of inositol 1,4,5-trisphosphate (InsP3) in the gravitropic response of oat (Avena sativa) shoot pulvini. Within 15 s of
American Society of Plant Physiologists.
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10. Cytoplasmic free Ca2+ in Arabidopsis roots changes in response to touch but not gravity.
Changes in cytoplasmic Ca2+ concentration ([Ca2+]i) have been proposed to be involved in signal transduction pathways in response to a number of stimuli, including gravity and touch. The current hypothesis proposes that the development of gravitropic bending is correlated with a redistribution of [Ca2+]i in gravistimulated roots. However, no study has demons
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11. Thermal fluctuations between conformational substates of the Fe(2+)-HisF8 linkage in deoxymyoglobin probed by the Raman active Fe-N epsilon (HisF8) stretching vibration.
We have measured the VFe-His Raman band of horse heart deoxymyoglobin dissolved in an aqueous solution as a function of temperature between 10 and 300 K. The minimal model to which these data can be fitted in a statistically significant and physically meaningful way comprises four different Lorentzian bands with frequencies at 197, 209, 218, and 226 cm-1, an
The Biophysical Society.