نتایج جستجو برای: df2
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In our TREC-8 interactive experiment, we compared the effectiveness of a user-defined passage feedback system with a conventional document feedback system. The passage feedback system (pf) employed user-defined passages to formulate a feedback query, while the document feedback (df) system utilized document-level relevance judgments. The df system employed the adaptive linear model for retrieva...
In order to reveal the flavor characteristics of Chinese pancakes, aroma and taste compounds seven traditional pancakes were identified. The results showed that electronic nose (E-nose) analysis with PCA could successfully distinguish profiles pancakes; principal components PC1 PC2 represented 75.74% 23.2% total variance (98.94%) respectively. Meanwhile, discrimination index based on tongue (E-...
In addition to their low stellar densities, ultra-diffuse galaxies (UDGs) have a broad variety of dynamical mass-to-light ratios, ranging from dark matter (DM) dominated systems objects nearly devoid DM. To investigate the origin this diversity, we develop simple, semi-empirical model that predicts structural evolution galaxies, driven by feedback massive star clusters, as function departure me...
چکیده: زمینه و هدف: هدف پژوهش حاضر، بررسی ویژگی های روان سنجی مقیاس ناامیدی کودکان و نوجوانان 12-19 سال، با به کار گیری تحلیل عاملی تاییدی بود. مواد و روش ها: بعد از ترجمه سوال ها، نمونه ای با حجم603 نفر دانش آموز 300 دختر و 303 پسر راهنمایی و دبیرستانی به روش نمونه گیری خوشه ای از بین دانش آموزان شهر تهران انتخاب شدند. برای محاسبه روایی همگرا و واگرا، هم زمان با اجرای مقیاس، پرسشنامه افسردگی ک...
The main part of this note is to show a general covering lemma in Rn, n 2 2 , with the aim to obtain the estimate for BMO norm and the volume of a nodal set of eigenfunctions on Riemannian manifolds. This article is a continuation of our previous work [L]. In [L] we proved a covering lemma in R2 and applied it to the BMO norm estimates for eigenfunctions on Riemannian surfaces. The principal pa...
Mechanisms underlying susceptibility to anthrax infection are unknown. Using a phylogenetically diverse panel of inbred mice and spores of Bacillus anthracis Ames, we investigated host susceptibility to pulmonary anthrax. Susceptibility profiles for survival time and organ pathogen load differed across strains, indicating distinct genetic controls. Tissue infection kinetics analysis showed grea...
van der Waals density functional theory (vdW-DFT) and semiempirical grand canonical Monte Carlo (GCMC) calculations are used to predict the thermodynamics and methane storage capacity of 18 metal-substituted variants of the metal−organic framework (MOF) M-DOBDC (DOBDC = 2,5-oxidobenzene-1,4dicarboxylate). Methane adsorption enthalpies (ΔH) on the benchmark Mgand NiDOBDC systems were calculated ...
Understanding the interaction between water and ceria surfaces is crucial in many catalytic applications. For the clean CeO2(111) surface, density functional theory (DFT) calculations using different generalized gradient approximations (GGAs) to the exchange-correlation functional and the DFT(GGA)+U method have found that the most stable configuration is on top of a surface cerium atom. However...
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