31,439 research outputs found
J. S. Sharma, V. P. Gandhi, Production and Consumption of Foodgrains in India : Implications of Accelerated Economic Growth and Poverty Alleviation, report n° 81 G. S. Bhalla, G. K. Chadha, S. P. Kashyap, R. K. Sharma, Agricultural Growth and Structural Changes in the Punjab Economy : an Input-Output Analysis
No full textÉtienne Gilbert. J. S. Sharma, V. P. Gandhi, Production and Consumption of Foodgrains in India : Implications of Accelerated Economic Growth and Poverty Alleviation, report n° 81 G. S. Bhalla, G. K. Chadha, S. P. Kashyap, R. K. Sharma, Agricultural Growth and Structural Changes in the Punjab Economy : an Input-Output Analysis. In: Tiers-Monde, tome 32, n°127, 1991. « Investissement-travail » et développement. Des approches et pratiques renouvelées ? sous la direction de André Guichaoua. pp. 718-719
Hydrothermal synthesis of Group 13 metal trifluoride complexes with neutral N-donor ligands
No full textThe reactions of the hydrated Group 13 fluorides, MF3·3H2O (M = Al, Ga or In) with 2,2?:6?,2??-terpyridyl, 2,2?-bipyridyl or 1,10-phenanthroline under hydrothermal conditions (180 °C/15 h) produced high yields of the complexes [MF3(terpy)]·3H2O, [MF3(bipy)(OH2)]·2H2O and [MF3(phen)(OH2)]. X-Ray crystal structures of [M?F3(terpy)]·3H2O (M? = Al or Ga), [M?F3(bipy)(OH2)]·2H2O and [GaF3(phen)(OH2)] show that all of them contain distorted octahedral geometries at the metal with mer-trifluoride coordination. Extensive H-bonding (FH–OH) links the molecules. The complexes have been further characterised by microanalysis, IR, 1H, 19F{1H} and 27Al NMR spectroscopy. In contrast, reactions of the trifluorides with the acyclic triamine, N,N,N?,N?,N??-pentamethyldiethylenetriamine, under similar hydrothermal conditions results in cleavage of the triamine and ring-closure to form the 1,1,4-trimethylpiperazinium cation, [?Me2N(CH2)2NMe(CH2)2]+, with fluorometallate anions, and confirmed by X-ray analysis of [?Me2N(CH2)2NMe(CH2)2]2[Al2F8(OH2)2]·2H2O. The strongly H-bonded [GaF3(terpy)]·3H2O was also obtained by Cl/F exchange from [GaCl3(terpy)] and [NBu4]F or [K(2,2,2-crypt)]F. Crystallisation of a mixture of [NH4][PF6] and [GaF3(terpy)]·3H2O from aqueous solution produced the edge-bridged cationic complex, [{Ga(terpy)F}2(?-F)2][PF6]2. The synthesis of the more sterically bulky [GaCl3(tBu3-terpy)] (tBu3-terpy = 4,4?4??-tris-tBu-2,2?:6?,2??-terpyridyl) and the crystal structure of [GaCl2(tBu3-terpy)][GaCl4], which contains a trigonal bipyramidal cation, are also reported
The shannon capacity on C(n,k)
No full textThis thesis focuses on a problem formulated by Claude Shannon named the Shannon capacity. This problem is about information rate per time unit over a noisy channel. The noisy channel is here represented by a graph. We specifically focus on a class of circulant graphs that are denoted by C(n,k) with vertex set z/nz, where all vertices are connected with the k-1 vertices before and after it. We will discuss upper bounds that were found for the Shannon capacity and how C(n,k) behaves with these upper bounds. After that we will focus on multiple ways to calculate lower bounds for the Shannon capacity of . For these three search methods will be used. These are exhaustive searching for optimal values, optimal ways to make packagings and solutions created by using a special form. As last the answers will be discussed by combining the upper and lower bounds for C(n,k). From this conclusions are drawn after which some possibilities will be given for further research. Applied Mathematic
Measurement of the ratio of branching fractions B(B0→K∗0γ )/B(B0s→φγ ) and the directCP asymmetry inB 0→K∗0γ
No full textThe ratio of branching fractions of the radiative B decays B0→K⁎0γ and B0s→ϕγ has been measured using an integrated luminosity of 1.0 fb−1 of pp collision data collected by the LHCb experiment at a centre-of-mass energy of s√=7TeV. The value obtained is
B(B0→K⁎0γ)B(B0s→ϕγ)=1.23±0.06(stat.)±0.04(syst.)±0.10(fs/fd),
where the first uncertainty is statistical, the second is the experimental systematic uncertainty and the third is associated with the ratio of fragmentation fractions fs/fd. Using the world average value for B(B0→K⁎0γ), the branching fraction B(B0s→ϕγ) is measured to be (3.5±0.4)×10−5.
The direct CP asymmetry in B0→K⁎0γ decays has also been measured with the same data and found to be
ACP(B0→K⁎0γ)=(0.8±1.7(stat.)±0.9(syst.))%.
Both measurements are the most precise to date and are in agreement with the previous experimental results and theoretical expectations
The Diophantine equation revisited
No full textLet k,l >= 2 be fixed integers, and C be an effectively computable constant depending only on k and l. In this paper, we prove that all solutions of the equation (x + 1)(k) + (x + 2)(k) + ... + (lx)(k) = y(n) in integers x, y,n with x, y >= 1, n >= 2, k not equal 3 and l 1 (mod 2) satisfy max{x, y, n} < C. The case when is even has already been completed by the second author (see [24])
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
K-theory for group C*-algebras
No full textThese notes are based on a lecture course given by the first author in the Sedano Winter School on K-theory held in Sedano, Spain, on January 22-27th of 2007. They aim at introducing K-theory of C*-algebras, equivariant K-homology and KK-theory in the context of the Baum-Connes conjectur
Poetic Formula “I see” in K. N. Batyushkov’s Work: Creative Assimila-tion of the Derzhavin Tradition
No full textThe author analyses the visual metaphors of K. N. Batyushkov’s poetry, in which he acts as the creative heir to the artistic style of G. R. Derzhavin. The urgency of the problem is connected with the need to clarify the features of the creative method of K. N. Batyushkov in the aspect of his assimilation of the Derzhavin tradition. The novelty of the research is connected with the expansion of ideas about the poetics of the visual in Russian poetry of the early 19th century, in particular, in the work of K. N. Batyushkov. It is proved that K. N. Batyushkov represents vision as a process of cognition of the world. The mechanisms of K. N. Batyushkov’s transformation of visually perceived world in an artistic image are considered, the artistic thinking of the poet is reconstructed. It is revealed that the model of creating a visual verbal image in K. N. Batyushkov’s work is based on the poetic formula “I see.” It is shown that K. N. Batyushkov emphasizes the position of the observer, reflecting at the same time on the diversity and greatness of God’s world, on the cause-and-effect relationship of reality phenomena. It is established that a special place is given to the representation of historical events in the work of the poet: through the poetic formula “I see” K. N. Batyushkov places himself inside the picture, which corresponds to the emerging aesthetics of romanticism with its cult of personal perception of reality
CT depiction of pulmonary emboli: display window settings
No full textPURPOSE: To compare computed tomographic (CT) window settings selected by radiologists with those determined by using two alternative approaches for depiction of pulmonary emboli (PE). MATERIALS AND METHODS: Institutional review board approval was obtained; informed consent was not required. This study was compliant with the Health Insurance Portability and Accountability Act. Twenty-five clinical chest CT studies were obtained with a standardized PE protocol and retrospectively evaluated by five chest and two body CT radiologists. Of these studies, 13 were positive for PE, and 12 were negative. At the main pulmonary artery (PA), mean attenuations (MPA) and standard deviations (SDPA) were measured. Initially, images were displayed with a standard mediastinal window setting (window width, W = 400 HU; window center, C = 30 HU), and each observer adjusted the setting to a personally preferred setting (eg, "personal") for PE detection. Images displayed at this setting were compared in a side-by-side fashion with the "modified" (W = MPA + 2 . SDPA, C = W/2) and "double-half" (W = 2 . MPA, C = MPA/2) window setting. Each observer rated images from 1 (ie, most preferred) to 3 (ie, least preferred). For quantitative analysis, window width and center value of each setting were divided by corresponding MPA to compute a width ratio and a center ratio. Window settings and ratings were compared with repeated-measures analysis of variance, paired t tests, and Wilcoxon signed-rank tests. RESULTS: Ratings for all three types of window settings were significantly different (P < .001). Observers preferred their personal settings the most and the modified settings the least. Mean ratios for the seven observers were 1.68 +/- 0.20 for window width and 0.47 +/- 0.08 for window center. Window width ratios for all settings were significantly different from each other (P < .001). Window center ratios were significantly higher for the modified setting than for the double-half setting (P = .013). Values for mean PA attenuation were correlated with window width ratios for six (86%) observers (mean r2 value = 0.29 +/- 0.19, P < or = .03) and with window center ratios for four (57%) observers (mean r2 value = 0.16 +/- 0.14, P < or = .02), thus indicating a trend of setting window width and window center higher when contrast enhancement is lower and vice versa. CONCLUSION: On average, observers selected CT window settings for PE detection at a window width of slightly less than twice the mean PA attenuation and at a window center of about half the mean PA attenuation. Observers tended to use larger window widths and centers as the degree of PA enhancement was lower
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