Observations on the Age and Growth of the Northern Pike, Esox Lucius L., in East Harbor, Ohio

Author Institution: Ohio Division of Wildlife, Columbus, Ohio and 2004 Sunrise Ave., Portsmouth, Ohi

CVX damage control information technology evolutionary model

Tightening of the U.S. defense budget has been closing in around the twelve aircraft carrier navy throughout the 1990's. In spite of this budget decline, the quantity and quality of our most expensive weapons, the aircraft carriers, have remained stable over the same period. These six thousand man ships, however, could soon become unwanted remains of the days of a 600-ship navy when recruiting was easier and manpower was less expensive. Damage control operations aboard the carrier require the greatest quantity of manpower of any single operational requirement. The next generation of carriers promises to be just as large and more diverse in mission than the current design. Without an infusion of sound technological advancements, the quantity of manpower required to protect these new carriers threatens to reduce the twelve-carrier navy to a more affordable number. The goal of this thesis is to establish a "technology roadmap" by which CVX can avoid where possible and negotiate where necessary, the changes in state of the art damage control technology. A deliberate and technologically sound process for improving the damage control capabilities aboard future and existing aircraft carriers is possible. A strong investment in information technology planning will play a major part in optimizing capabilities and manpower requirements of CVX. The reward will be improved robustness, efficiency and quality of life, keeping the next generation of aircraft carriers a truly labeled "high value unit"http://archive.org/details/cvxdamagecontrol109458181Lieutenant, United States NavyApproved for public release; distribution is unlimited

Freezing and melting transitions of liquids in mesopores with ink-bottle geometry

Freezing and melting behavior of nitrobenzene in mesoporous silicon with different pore size and with different porous structure have been studied using H-1 NMR cryoporometry. With the bulk phase surrounding the porous monoliths, in materials with uniform channel-like pores distinct pore-size-dependent freezing and melting transitions have been measured. These data were further used for the analysis of the fluid behavior in samples with modulated porous structure, namely linear pores with alternating cross-section. We have, in particular, considered two materials consisting of channel sections, which were separated by almost identical channel `necks' but notably differed in the respective channel diameters. In the smaller channel segments, the observed shift in the freezing temperature provides direct evidence of the relevance of a pore-blocking mechanism, i.e. of the retardation in the propagation of a solid front by the channel necks. In the channel segments with larger diameter, on the other hand, freezing is found to be initiated by homogeneous nucleation.DF

MOF membrane synthesis in the confined space of a vertically aligned LDH network

MOF membranes have gained widespread attention due to their unprecedented gas separation performance. Relying on physical interactions, we successfully deposited MOF seeds on a substrate modified with a network of vertically aligned LDH walls before secondary growth of the MOF layer. ZIF-8 membranes thus prepared show considerable H-2 permeance with high H-2-CH4 selectivity. This approach is in general suitable for the deposition of nanoparticles on solid surface and their subsequent growth into a dense layer.EC/FP7/263007Alexander von Humboldt FoundationFP7-NMP-2010-LARGE-4, Nr. 26300

Combination of Laser and Thermal Sintering of Thermoelectric Ca3Co4O9 Films

The manufacturing technology of thermoelectric materials is laborious and expensive often including complex and time-intensive preparation steps. In this work, a laser sintering process of the oxide-based thermoelectric material Ca3Co4O9 is investigated. Samples based on spray-coated Ca3Co4O9 were prepared and subsequently sintered under various laser parameters and investigated in terms of the microstructure and thermoelectric properties. Here, the combination of laser sintering and subsequent thermal sintering proved to be a promising concept for the preparation of thermoelectric films. Laser sintering can thus make a great contribution in improving the processing of thermoelectric materials, especially when films are applied that cannot be sintered under pressure. © 2021 The Authors. Chemie Ingenieur Technik published by Wiley-VCH Gmb

Advanced material model for shear cutting of metal sheets

A finite-element simulation of the shear cutting process is used to predict thegeometry of the cutting surface. A fully-coupled Lemaitre-type model is used in the process model for the description of the material behaviour. The extended Lemaitre model considers the influence of shear and compression-dominated stress states on the propagation of damage. Tensile tests with and without notches are used for the identification of material parameters. These methods are advantageous for the analysis of different blanking processes. Since damage parameters have a strong influence on the cutting surface quality, a numerical study isconducted to analyse their influence. The results of the simulations are compared with experimental data

Electrospun Ca3Co4−xO9+δ nanofibers and nanoribbons: Microstructure and thermoelectric properties

Oxide-based ceramics offer promising thermoelectric (TE) materials for recycling high-temperature waste heat, generated extensively from industrial sources. To further improve the functional performance of TE materials, their power factor should be increased. This can be achieved by nanostructuring and texturing the oxide-based ceramics creating multiple interphases and nanopores, which simultaneously increase the electrical conductivity and the Seebeck coefficient. The aim of this work is to achieve this goal by compacting electrospun nanofibers of calcium cobaltite Ca3Co4−xO9+δ, known to be a promising p-type TE material with good functional properties and thermal stability up to 1200 K in air. For this purpose, polycrystalline Ca3Co4−xO9+δ nanofibers and nanoribbons were fabricated by sol–gel electrospinning and calcination at intermediate temperatures to obtain small primary particle sizes. Bulk ceramics were formed by sintering pressed compacts of calcined nanofibers during TE measurements. The bulk nanofiber sample pre-calcined at 973 K exhibited an improved Seebeck coefficient of 176.5 S cm−1 and a power factor of 2.47 μW cm−1 K−2 similar to an electrospun nanofiber-derived ceramic compacted by spark plasma sintering