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Search Results: 1 - 10 of 15752 matches for " growth habit "
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Equilibrium Dynamics in the Neoclassical Growth Model with Habit Formation and Elastic Labor Supply  [PDF]
Manuel A. Gómez
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.25087
Abstract: This note analyzes the equilibrium dynamics in the neoclassical growth model with habit-forming preferences and elastic labor supply. Habits enter into utility in a multiplicative way. The specification of the habit formation process comprises the particular cases of internal and external habits. Existence, uniqueness and saddle-path stability of the steady state are proved analytically.
Caracteriza??o morfofisiológica de genótipos de cornich?o (Lotus corniculatus L.)
Soster, Maria Tereza Bolzon;Scheffer-Basso, Simone Meredith;Dall'Agnol, Miguel;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000700003
Abstract: the birdsfoot trefoil cv. s?o gabriel is an important winter-spring growing legume in the southern brazil, which main limitation is the low persistence under grazing. the objective of this work was to evaluate eight populations of this cultivar, selected under grazing or cut, comparing with one rhizomatous genotype (cv. ars-2620) and a cultivar from uruguay without rhizomes (cv. trueno), with the purpose to evaluate the morphological variability and characters linked to grazing tolerance. two assays were conducted in the greenhouse with plants grown in pots until the full flowering stage. it was observed morphological variability in the germplasm, with variation in the leaf, stem and crown morphology as well as in growth habit. only in the cv. ars-2620 was observed typical rhizomes, but all the genotypes showed subterraneous stems. the cv. ars-2620 was susceptible to mites and two populations showed symptoms of anthracnose (colletotrichum sp.). the morphophysiological variability of the cv. s?o gabriel populations can be used in a birdsfoot trefoil breeding programs.
On the Closed-Form Solution to the Endogenous Growth Model with Habit Formation  [PDF]
Ryoji Hiraguchi
Theoretical Economics Letters (TEL) , 2012, DOI: 10.4236/tel.2012.24064
Abstract: We study the AK growth model with external habit formation. We show that there exists a unique solution path expressed in terms of the Gauss hypergeometric function. Using the closed-form solution, we also show that the optimal path converges to a balanced growth path.
THE WELFARE COST OF EXTERNAL HABITS: A QUANTITATIVE ASSESSMENT
Gómez,Manuel A;
Estudios de economía , 2010, DOI: 10.4067/S0718-52862010000100001
Abstract: this paper quantifies the welfare cost of consumption externalities in an endogenous growth model with habit formation. agent's utility depends on both current consumption and a reference consumption level determined by economy-wide average past consumption. although utility may be lower in the presence of consumption externalities, the welfare loss relative to the efficient growth path is found to be very small. this result is extremely robust to variations in the parameter values. however, there are relatively important differences in the timing of the welfare loss and in generational welfare.
Allelic variation at the Vrn-A1, Vrn-B1, Vrn-D1, Vrn-B3 and Ppd-D1a loci of Pakistani spring wheat cultivars
Iqbal,Muhammad; Shahzad,Armghan; Ahmed,Iftikhar;
Electronic Journal of Biotechnology , 2011,
Abstract: flowering time in bread wheat (triticum aestivum l.) is controlled by vernalization and photoperiod response, and earliness per se genes. the genetic basis of flowering time has not been investigated in pakistani bread wheat. this study was, therefore, conducted to determine the allelic composition at vrn-a1, vrn-b1, vrn-d1, vrn-b3 and ppd-d1a loci of 59 pakistani spring bread wheat cultivars. these cultivars, along with 4 isogenic lines for vernalization genes were characterized with previously reported dna markers designed for detecting allelic variation at 4 vrn (vernalization) and 1 ppd (photoperiod) loci. spring habit vrn-a1a allele was found in 36% cultivars either alone or with spring habit vrn-b1 and vrn-d1 alleles. two wheat cultivars had the dominant vrn-a1c allele, whereas none of the cultivars had vrn-a1b. spring habit vrn-b1 was the most frequent allele (64%) present either alone or with vrn-a1a, vrn-a1c and vrn-d1. spring habit vrn-d1 was found in 61% cultivars. vrn-d1 was singly found in 25% cultivars and along with vrn-b1 in 29% cultivars. dominant vrn-b3 was absent in all cultivars studied. all cultivars except era had the photoperiod insensitive allele ppd-d1a. we did not find any association between the flowering time and vrn allelic composition of the studied cultivars. this indicated that the partial vernalization requirement of cultivars with vrn-b1 and vrn-d1 alleles is probably fulfilled during pakistani growing season. earliness per se and the photoperiod sensitive loci other than ppd-d1 need to be investigated to further understand the genetic basis of flowering time in pakistani wheat.
Astro-INIA: Primera Variedad de Poroto Granado Tipo Coscorrón de Hábito de Crecimiento Determinado Arbustivo
Tay,Juan; France,Andrés; Pedreros,Alberto;
Agricultura Técnica , 2006, DOI: 10.4067/S0365-28072006000400011
Abstract: astro-inia is the first bean (phaseolus vulgaris l.) variety of the coscorron type released in chile, for green shelled bean production, with determinated bush growth habit (type 1) released in chile. its origin was by selection from a plant selection with a determined of bush growth habit , type 1, from a plantation of a seed producing crop of the coscorron variety granado-inia, the latter with a vine growth habit. besides its good architecture, astro-inia is notable for its earliness and good culinary quality, similarly to other coscorron varieties and landraces used in chile for green shelled bean production.
A Left-Handed, Stem-Twining Plant from the Miocene Shanwang Formation of Eastern China  [PDF]
Qi Wang, Si Shen, Zhenyu Li
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.45A003
Abstract:

Twining stems of plants are very common in extant tropical and subtropical forests, and the climbing growth habit of plants may be an evolutionary innovation and ecological adaptation to either closed, shady or open, edge environments. However, the origin of handedness in climbing plants remains unclear. Here we report a Miocene (ca. 16 million years ago) macrofossil from the Shanwang Formation of Shandong Province, Eastern China, unequivocally exhibiting the first direct fossil evidence for a left-handed, stem-twining growth habit in plants. This fossil plant bears a thicker, slightly curved supporting stem (2 - 3.5 mm wide), which is loosely, spirally twined by a thinner stem (1.5 - 2 mm wide), possibly representing part of distal branches from a liana or vine.

Evaluation of Soybean Cultivars of Contrasting Cycles according to the Level of Investment in Fertilization  [PDF]
Emerson Borghi, Eduardo de Paula Sim?o, álvaro Vilela de Resende, Jo?o Carlos Cardoso Galv?o, Sebasti?o Pedro da Silva Neto, André Ferreira Pereira
American Journal of Plant Sciences (AJPS) , 2017, DOI: 10.4236/ajps.2017.812202
Abstract: The objective of the present study was to characterize the duration of the phenological stages, the agronomic characteristics and grain yield in soybean cultivars with contrasting cycles and indeterminate growth type, submitted to different fertilization investment environments under no-tillage system in the central region of Minas Gerais. The work was conducted under field conditions, in an experimental area of Embrapa Maize and Sorghum, in Sete Lagoas, MG, in the harvest of 2015/2016. Ten soybean cultivars with different relative maturity groups (RMG) were studied, representing almost all RMG materials currently sown in Minas Gerais, in two environments with different levels of fertilizer investment. The variables were submitted to analysis of joint variance, in order to verify the existence of interaction between cultivars and investment in fertilization environments. Fertilizer investment levels influence grain yield of soybean cultivars of contrasting cycles. The higher height of the soybean plants implies higher lodging and lower grain yield. This situation is aggravated by the greater investment in fertilization. The difference between the cycles of the cultivars is in the duration of the vegetative stages, being greater in the later cultivars.
Effects Of Maturity Group and Growth Habit on Vegetative GrowthYield and Yield Components of Soybean [Glycine max (L.) Merr.]
Mohammad Reza Shahsavari,Gholam Hossain Shiresmaiely
Journal of Science and Technology of Agriculture and Natural Resources , 1998,
Abstract: Knowledge of the vegetative and reproductive characteristics of soybean cultivars with different growth habits and maturity groups is essential for the selection of a suitable variety as well as for providing optimum conditions for their growth. In 1994 in a field located in Kholenjan of Isfahan, Iran, nine indeterminate type cultivars belonging to different maturity groups, namely Williams, Wood Worth, Hack, Zane, Black Hawk, Bonus, Steel, S.R.F. and Harcor and one determinate cultivar belonging to maturity group III namely Hobbit, in a complete block design with four replications were evaluated. Indeterminate cultivars and higher maturity group cultivars produced more dry matter. On the whole, indeterminate cultivars with later maturity had longer main stem with more nodes, pods and grains. The determinate cultivar had more lateral branches, and more pods and grains in them but these traits did not show any specific trend in different maturity groups. Height of the first pod from ground surface in indeterminate cultivars was more than that of determinate cultivars. Number of pods per each node of main stem, number of grains per each pod of lateral branch and number of nodes per lateral branch showed no significant difference among cultivars. Classification of these cultivars based on the above characteristics showed that cultivars with different growth habits had basic differences and also that some cultivars showed some similarity to maturity groups which did not exist in the present study.
Direct Observation of THF Hydrate Formation in Porous Microstructure Using Magnetic Resonance Imaging
Kaihua Xue,Jiafei Zhao,Yongchen Song,Weiguo Liu,Weihaur Lam,Yiming Zhu,Yu Liu,Chuanxiao Cheng,Di Liu
Energies , 2012, DOI: 10.3390/en5040898
Abstract: The porous microstructure of hydrates governs the mechanical strength of the hydrate-bearing sediment. To investigate the growth law and microstructure of hydrates in porous media, the growth process of tetrahydrofuran (THF) hydrate under different concentration of THF solution is directly observed using Magnetic Resonance Imaging (MRI). The images show that the THF hydrate grows as different models under different concentration of THF solution (19%, 11.4% and 5.7% by weight) at 1 °C. When the concentration is 19% (stoichiometric molar ratio of THF/H 2O = 1:17), the THF hydrate grows as cementing model. However, with the decreasing concentration of THF, the growth model transfers from cementing model to floating model. The results show that the growth of the THF hydrate was influenced by the dissolved quantity of THF in the water. The extension of the observed behavior to methane hydrate could have implications in understanding their role in seafloor and permafrost stability.
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