نتایج جستجو برای: نسبت fr

تعداد نتایج: 170001  

1999
Alek Vainshtein

Let fr n (k) be the number of 132-avoiding permutations on n letters that contain exactly r occurrences of 12 . . . k, and let Fr(x; k) and F (x, y; k) be the generating functions defined by Fr(x; k) = ∑ n>0 f r n (k)xn and F (x, y; k) = ∑ r>0 Fr(x; k)y r . We find an explcit expression for F (x, y; k) in the form of a continued fraction. This allows us to express Fr(x; k) for 1 6 r 6 k via Che...

Journal: :Electr. J. Comb. 2000
Toufik Mansour Alek Vainshtein

Let fr n(k) be the number of 132-avoiding permutations on n letters that contain exactly r occurrences of 12 . . . k, and let Fr(x; k) and F (x, y; k) be the generating functions defined by Fr(x; k) = P n>0 f r n(k)x n and F (x, y; k) = P r>0 Fr(x; k)y r. We find an explicit expression for F (x, y; k) in the form of a continued fraction. This allows us to express Fr(x; k) for 1 6 r 6 k via Cheb...

Journal: :Journal of child psychology and psychiatry, and allied disciplines 2012
Elsje van Bergen Peter F de Jong Anna Plakas Ben Maassen Aryan van der Leij

BACKGROUND The present study concerns literacy and its underlying cognitive skills in Dutch children who differ in familial risk (FR) for dyslexia. Previous studies with FR-children were inconclusive regarding the performance of FR-children without dyslexia as compared to the controls. Moreover, van Bergen et al. (2011) recently showed that FR-children with and without dyslexia differed in pare...

Journal: :Plant physiology 1996
J J Casal

We sought to determine if phytochrome B (phyB)-mediated responses to the red light (R)/far-red light (FR) ratio are affected by phytochrome A (phyA) activity in light-grown seedlings of Arabidopsis thaliana. Pulses of FR delayed into the dark period were less effective than end-of-day (EOD) FR in promoting hypocotyl growth over a given period in darkness. White light minus blue light interposed...

Journal: :American journal of physiology. Endocrinology and metabolism 2006
Gyasi Johnson Damien Roussel Jean-François Dumas Olivier Douay Yves Malthièry Gilles Simard Patrick Ritz

Variable durations of food restriction (FR; lasting weeks to years) and variable FR intensities are applied to animals in life span-prolonging studies. A reduction in mitochondrial proton leak is suggested as a putative mechanism linking such diet interventions and aging retardation. Early mechanisms of mitochondrial metabolic adaptation induced by FR remain unclear. We investigated the influen...

2012
Jeong Hwa Kim Jae Seong Lee Kyung Rim Lee Mi Ja Shim Min Woong Lee Pyung Gyun Shin Jong Chun Cheong Young Bok Yoo Tae Soo Lee

This study was initiated in order to investigate the anticancer and immunomodulating activities of crude polysaccharides extracted in methanol, neutral saline, and hot water (hereinafter referred to as Fr. MeOH, Fr. NaCl, and Fr. HW, respectively) from the fruiting bodies of Panellus serotinus. Content of β-glucan and protein in Fr. MeOH, Fr. NaCl, and Fr. HW extracts of P. serotinus ranged fro...

Journal: :Endocrinology 2008
Floor Remmers Linda A W Verhagen Roger A H Adan Henriette A Delemarre-van de Waal

Rats subjected to early postnatal food restriction (FR) show persistent changes in energy balance. The hypothalamus plays a major role in the regulation of energy balance. Therefore, we hypothesized that early postnatal food restriction induces developmental programming of hypothalamic gene expression of neuropeptides involved in this regulation. In the hypothalamus of juvenile and middle-aged ...

Journal: :Journal of animal science 2013
S Zhang J R Aschenbach D R Barreda G B Penner

Our objective was to determine if the severity of short-term feed restriction (FR) affects the timeline for recovery of the absorptive function of the reticulo-rumen and barrier function of the total gastrointestinal tract in beef cattle. Eighteen ruminally cannulated and ovariectomized Angus × Hereford heifers were housed in individual pens. Heifers were blocked by initial BW into 3 blocks and...

Journal: :Respiration physiology 1992
D M Caretti P C Szlyk I V Sils

Ventilatory patterns and respiratory timing were measured in 14 subjects during cycling (CYC) and treadmill exercise (TM) at similar leg frequencies (fLEG) to determine if mode of exercise affects patterns of ventilation and respiratory timing. Measurements of breathing frequency (fR), tidal volume (VT), expired ventilation (VE), and inspiratory (TI) and expiratory (TE) time were obtained at fL...

Journal: :Computers & OR 2015
Daniel Baena Jordi Castro José A. González

Controlled tabular adjustment (CTA) is a relatively new protection technique for tabular data protection. CTA formulates a mixed integer linear programming problem, which is challenging for tables of moderate size. Even finding a feasible initial solution may be a challenging task for large instances. On the other hand, end users of tabular data protection techniques give priority to fast execu...

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