We provide a search method for Legendre pairs of composite length based on generating binary matrices with fixed row and column sums from compressed, complementary integer vectors. This approach yielded the first construction pair 77, as well exhaustive generation 55.

Chromatography is commonly used as a purification method for synthetic oligodeoxyribonucleotides (1). Anion exchange chromatography on Mono Q column (Pharmacia), under denaturing conditions and using non-organic buffers, gives adequate purity for sequences up to 50 bases long (2). The eluting NaCl concentration primarily depends on the oligonucleotide length. However, base composition and seque...

This brief provides a detailed analysis of active pixel sensor, pixel and column circuit. Surprisingly, we find that shorter readout times can be achieved by reducing the bias current and hence reducing energy consumption. We investigate the effect of nonidealities on the readout operation. We find that when the follower transistor channel-length modulation is taken into consideration, delay is...

Abstract. We study the statistics of column-convex lattice animals resulting from the stacking of squares on a single or double staircase. We obtain exact expressions for the number of animals with a given length and area, their mean length and their mean height. These objects are closely related to Fibonacci numbers. On a single staircase, the total number of animals with area k is given by th...

In order to study the bearing characteristic of geosynthetic-encased stone column (GESC) on composite foundation, a series field tests and numerical simulation were carried out foundations reinforced by traditional GESC. The pile–soil stress ratio, excess pore water pressure lateral displacement two kinds monitored. effects geotextile stiffness, wrapping length gravel internal friction angle fo...

A new method for generating positrons has been proposed that uses betatron X-rays emitted by an electron beam in a high-K plasma wiggler. The plasma wiggler is an ion column produced by the head of the beam when the peak beam density exceeds the plasma density. The radial electric field of the beam blows out the plasma electrons transversely, creating an ion column. The focusing electric field ...

Sorption systems are a prevalent technology in the field of environmental engineering for treating waters contaminated with organic and/or inorganic compounds. Examples of such contaminants include taste and odor, hardness, disinfection byproduct precursors, and arsenic. The primary operating costs for these sorption systems lie in sorbent replacement. Different column arrangements and the use ...

Direct numerical simulation is used to study the mixing of a passive scalar by a vortex ring issuing from a nozzle into stationary fluid. The ‘formation number’ (Gharib et al. J. Fluid Mech. vol. 360, 1998, p. 121), is found to be 3.6. Simulations are performed for a range of stroke ratios (ratio of stroke length to nozzle exit diameter) encompassing the formation number, and the effect of stro...

We developed a novel smart multi-channel two-dimensional (2-D) micro-gas chromatography (μGC) architecture that shows promise to significantly improve 2-D μGC performance. In the smart μGC design, a non-destructive on-column gas detector and a flow routing system are installed between the first dimensional separation column and multiple second dimensional separation columns. The effluent from t...