6,061 research outputs found
World Soybean Production: Area Harvested, Yield, and Long-Term Projections
No full textSoybean, production, yield, land use, long-term projection, exponential smoothing with damped trend, Agribusiness, Agricultural and Food Policy, Crop Production/Industries, Land Economics/Use, Q1,
Catalytic P-H activation by Ti and Zr catalysts
No full textCatalytic dehydrocoupling of phosphines was investigated using the anionic zirconocene trihydride salts [Cp*Zr-2(mu-H)(3)Li](3) (1a) or [Cp*Zr-2(mu-H)(3)K(thf)(4)] (1b), and the metallocycles [CpTi(NPtBu3)(CH2)(4)] (6) and [Cp*M(NPtBu3)(CH2)(4)] (M = Ti 20, Zr 21) as catalyst precursors. Dehydrocoupling of primary phosphines RPH2 (R = Ph, C6H2Me3, Cy, C10H7) gave both dehydrocoupled dimers RP(H)P(H)R or cyclic oligophosphines (RP)(n) (n = 4, 5) while reaction of tBu(3)C(6)H(2)PH(2) gave the phosphaindoline tBu(2)(Me2CCH2)C6H2PH (9). Stoichiometric reactions of these catalyst precursors with primary phosphines afforded [Cp*Zr-2((PR)(2))H][K(thf)(4)] (R = Ph 2, Cy 3, C6H2Me3 4), [Cp*Zr-2((PPh)(3))H] [K(thf)(4)] (5), [CpTi(NPtBu3)(PPh)(3)] (7) and [CpTi(NPtBu3)(mu-PHPh)](2) (8), while reaction of 6 with (C(6)H(2)tBu3)PH2 in the presence of PMe3 afforded [CpTi(NPtBu3)(PMe3)(p(C(6)H(2)tBu(3))] (10). The secondary phosphines Ph2PH and (PhHPCH2)(2)CH2 also undergo dehydrocoupling affording (Ph2P)(2) and (PhPCH2)(2)CH2. The bisphosphines (CH2PH2)(2) and C6H4(PH2)(2) are dehydrocoupled to give (PCH2CH2PH)(2) (12) and (C6H4P(PH))(2) (13) while prolonged reaction of 13 gave (C6H4P2)(8) (14). The analogous bisphosphine Me2C6H4(PH)(2) (17) was prepared and dehydrocoupling catalysis afforded (Me2C6H2P(PH))(2) (18) and subsequently [(Me2C6H2P2)(2)(mu-Me2C6H2P2)](2) (19). Stoichiometric reactions with these bisphosphines gave [Cp*Zr-2(H)(PH)(2)C6H4] [Li(thf)(4)] (22), [Cp*Ti(NPtBu3)(PH)(2)C6H4](2) (23) and [Cp*Ti(NPtBu3)(PH)(2)C6H4] (24). 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Serum HMGB1 concentrations at 4 weeks is a useful predictor of extreme poor prognosis for advanced hepatocellular carcinoma treated with sorafenib and hepatic arterial infusion chemotherapy
No full text博士(医学)Doctor of Philosophy in Medical Science広島大
Noise inference for ergodic Lévy driven SDE
No full textWe study inference for the driving Lévy noise of an ergodic stochastic differential equation (SDE) model, when the process is observed at high-frequency and long time and when the drift and scale coefficients contain finite-dimensional unknown parameters. By making use of the Gaussian quasi-likelihood function for the coefficients, we derive a stochastic expansion for functionals of the unit-time residuals, which clarifies some quantitative effect of plugging-in the estimators of the coefficients, thereby enabling us to take several inference procedures for the driving-noise characteristics into account. We also present new classes and methods available in YUIMA for the simulation and the estimation of a Lévy SDE model. We highlight the flexibility of these new advances in YUIMA using simulated and real data
Quasi-likelihood analysis for Student-Lévy regression
No full textWe consider the quasi-likelihood analysis for a linear regression model driven by a Student-t Lévy process with constant scale and arbitrary degrees of freedom. The model is observed at high frequency over an extending period, under which we can quantify how the sampling frequency affects estimation accuracy. In that setting, joint estimation of trend, scale, and degrees of freedom is a non-trivial problem. The bottleneck is that the Student-t distribution is not closed under convolution, making it difficult to estimate all the parameters fully based on the high-frequency time scale. To efficiently deal with the intricate nature from both theoretical and computational points of view, we propose a two-step quasi-likelihood analysis: first, we make use of the Cauchy quasi-likelihood for estimating the regression-coefficient vector and the scale parameter; then, we construct the sequence of the unit-period cumulative residuals to estimate the remaining degrees of freedom. In particular, using full data in the first step causes a problem stemming from the small-time Cauchy approximation, showing the need for data thinning
Alumina-embedded Au nanowires for SERS sensing
No full textWe propose a novel substrate for SERS bio-sensing composed of an hexagonal array of gold nanorods embedded in an anodically-oxidized alumina substrate, reaching a surface field enhancement up to 220 times
Neoirietriol
No full textThe title compound {systematic name: (1R,4S,4aS,7R,8aR)-4-bromo-7-[(1S,3R)-3-bromo-1,2,2-trimethylcyclopentyl]-1,4a-dimethyldecahydronaphthalene-1,7,8a-triol}, C20H34Br2O3, is a neoirieane-type bromoditerpenoid isolated from Laurencia yonaguniensis Masuda et Abe, species inedita. The absolute stereochemistry was established as (1S,4R,5R,7R,10S,11S,14R). The structure displays inter- and intramolecular O—H...O hydrogen bonding
A new polymorph of 2,6-bis(trifluoromethyl)benzoic acid
No full textThe asymmetric unit of a second polymorph of the title compound, C9H4F6O2, contains five independent molecules, which form hydrogen-bonded O—H...O dimers about inversion centers. The most significant structural difference between this structure and that of the first polymorph [Tobin & Masuda (2009). Acta Cryst. E65, o1217] is the hydrogen-bonded, dimeric orientation of the carboxylic acid functionalities
Regulation of chloroplast development in relation to leaf age and N-, P- and S-nutrition
No full textDietz K-J, Schönrock M, Heilos L, Mimura T. Regulation of chloroplast development in relation to leaf age and N-, P- and S-nutrition. In: Tazawa M, Katsumi M, Masuda Y, Okamoto H, eds. Plant Water Relations and Growth Under Stress. Tokyo: Myu K.K.; 1989: 129-132
R. H. Coase, 1974, The Market for Goods and the Market for Ideas, American Economic Review, 64(2), 384-391
No full text本稿は、R. H. Coase, 1974, The Market for Goods and the Market for Ideas, American Economic Review, 64(2), 384-391を全訳したものである。本稿は、アメリカ合衆国憲法修正第一条が保障する「言論・出版・報道の自由」を"アイデア市場"とよび、通常の財・サービス市場への政府介入との比較で、アイデア市場への政府介入のあり方を考察している。従来、財・サービス市場への政府介入は"市場の失敗"を補整することから正当化されてきた。ただし、この介入さえ正しい評価を受けていない。この論文において、コースは、アイデア市場は市場参加者(知識人など)の利己心と自負心に任せて自由に運営される限り、うまく機能する、という。また、アイデア市場への政府介入が許されるのは、財・サービス市場への介入が正しい評価を受けた場合である、という
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