نتایج جستجو برای: p malapterura

تعداد نتایج: 1269698  

Journal: :Journal of the American College of Radiology 2021

2007
Markus Bläser Holger Dell

The cover polynomial introduced by Chung and Graham is a twovariate graph polynomial for directed graphs. It counts the (weighted) number of ways to cover a graph with disjoint directed cycles and paths, it is an interpolation between determinant and permanent, and it is believed to be a directed analogue of the Tutte polynomial. Jaeger, Vertigan, and Welsh showed that the Tutte polynomial is #...

رضا باقری, ستار زینالی سید ابراهیم صادقی سید محسن حسام‌زاده حجازی مهری باب‌مراد,

سنک صنوبر Monosteira unicostata از خانواده Tingidae یکی از آفات مهم درختان صنوبر در نهالستانها و صنوبرکاریهای کرج می‎باشد. طی سالهای 1382 تا 1384، میزان تخم‌ریزی این آفت روی 15 کلن بومی و غیر‌بومی صنوبر که اواخر سال 1381 در قالب طرح بلوکهای کامل تصادفی و با سه تکرار در مرکز تحقیقات البرز کرج کاشته شده بودند، مورد ارزیابی قرار گرفت. این کلن‌ها متعلق به گونه‌های Populus nigra L.، P. alba L.، P. d...

Journal: :CoRR 2017
Stéphane Gaubert Marie MacCaig

We investigate the complexity of counting the number of integer points in tropical polytopes, and the complexity of calculating their volume. We study the tropical analogue of the outer parallel body and establish bounds for its volume. We deduce that there is no approximation algorithm of factor α = 2 for the volume of a tropical polytope given by n vertices in a space of dimension m, unless P...

2017
Russell Impagliazzo Valentine Kabanets Antonina Kolokolova Pierre McKenzie Shadab Romani

The Black-Box Hypothesis, introduced by Barak et al. [BGI12], states that any property of boolean functions decided efficiently (e.g., in BPP) with inputs represented by circuits can also be decided efficiently in the black-box setting, where an algorithm is given an oracle access to the input function and an upper bound on its circuit size. If this hypothesis is true, then P 6= NP. We focus on...

Journal: :Nanoscale 2014
Xianghu Tang Wenya Cai Liangbao Yang Jinhuai Liu

Investigating the kinetics of catalytic reactions with surface-enhanced Raman scattering (SERS) on a single particle remains a significant challenge. In this study, the single particle of the constructed hierarchical peony-like silver microflowers (SMFs) with highly roughened surface led to the coupling of high catalytic activity with a strong SERS effect, which acts as an excellent bifunctiona...

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