Agrawal (1966) constructed a series of row column designs with rowcolumn incidence structure J − I . We show that there exist designs which strongly dominate Agrawal’s designs for all v ≥ 4 and are therefore to be preferred with respect to any optimality criterion. These dominating designs are E-optimal within the entire class of such row-column designs and are also highly Aand D-efficient. Som...

The present article describes a field auger sampling method for row-crop root measurements. In agroecosystems where crops are planted in a specific design (row crops), sampling procedures for root biomass quantification need to consider the spatial variability of the root system. This article explains in detail how to sample and calculate root biomass considering the sampling position in the fi...

this study examined suitable mechanized methods to seed rice in dry-bed conditions using dried seeds and determined the most suitable varieties for each method. the experimental design was strip-plots in a randomized complete block design with two factors (seeding methods and rice varieties) and three replications. the testing took place during 2003-2004 at the shavour agricultural research sta...

the use of more competitive species and cultivars in small grain cereal production may help to develop production systems that require less herbicide. this study was designed to identify root and shoot characteristics of cereal seedlings that would allow distinguishing the more competitive (mc) cultivars from the less competitive (lc) ones. two growth cabinet trials were conducted using four cr...

We address the denoising of images contaminated with multiplicative noise, e.g. speckle noise. Classical ways to solve such problems are filtering, statistical (Bayesian) methods, variational methods, and methods that convert the multiplicative noise into additive noise (using a logarithmic function), apply a variational method on the log data or shrink their coefficients in a frame (e.g. a wav...

We introduce several improvements to the hierarchical radiosity method. First, a complete analysis of a specific implementation of the hierarchical radiosity method allows to point out its bottlenecks. Based on this analysis, we suggest two simple improvements: a lazy evaluation of top-level interactions, and a new refinement criterion, that greatly reduces the number of interactions, without l...

a field study was conducted to determine the effects of planting method, density and nicosulforon on corn (ksc704) and weeds grown in corn at agricultural and natural resources research center of khorasan-razavi province, iran in 2009-2010 growing season. the treatments were: three planting methods (one row, two row and in-row), two planting density (75000 and 90000 plants/ha) and three doses o...

Block clustering (or co-clustering or simultaneous clustering) aims at simultaneously partitioning the rows and columns of a data table to reveal homogeneous block structures. This structure can stem from the latent block model which provides a probabilistic modelling of data tables whose blocks arise from row and column clusters. For continuous data, each table entry is typically assumed to fo...

Minyoung Lee and Alan J. H. McGaughey Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA (Received 2 February 2011; published 29 April 2011) The energetics and kinetics of the c(2 × 2) to (2√2 ×√2)R45◦ missing-row reconstruction transition on the Cu(100) surface are investigated using density functional theory calculations. First, oxygen-molecu...