Conjugate Heat Transfer Characteristics of Double Wall Cooling With Gradient Diameter of Film and Impingement Holes

Double wall cooling, consisting of internal impingement cooling and external film cooling, is believed to be the most advanced technique in modern turbine blades cooling. In this paper, to improve the uniformity of temperature distribution, a flat plate double wall cooling model with gradient diameter of film and impingement holes was proposed, and the heat transfer and flow characteristics were investigated by solving steady three-dimensional Reynolds-Averaged Navier-Stokes (RANS) equations with SST k-ω turbulence model. The influence of gradient diameter on overall cooling effectiveness and total pressure loss was studied by comparing with the uniform pattern at the blowing ratios ranging from 0.5 to 2. For gradient diameter of film hole patterns, results show that −10% film pattern always has the lowest film flow non-uniformity coefficient. The laterally averaged overall cooling effectiveness of uniform pattern lies between that of +10% and −10% film patterns, but the intersection of three patterns moves upstream from the middle of flow direction with the increase of blowing ratio. Therefore, the −10% film pattern exerts the highest area averaged cooling effectiveness, which is improved by up to 1.6% and 1% at BR = 0.5 and 1 respectively compared with a uniform pattern. However, at higher blowing ratios, the +10% film pattern maintains higher cooling effectiveness and lower total pressure loss. For gradient diameter of impingement hole patterns, the intersection of laterally averaged overall cooling effectiveness in three patterns is located near the middle of flow direction under all blowing ratios. The uniform pattern has the highest area averaged cooling effectiveness and the smallest non-uniform coefficient, but the −10% jet pattern has advantages of reducing pressure loss, especially in the laminated loss.

Budgeters’ Perceptions of the Scope, Support, and Patterns of Implementation of Performance Budgeting in Texas Cities

This study views performance budgeting as a budget innovation, and examines how this innovation tool has been diffused across the largest cities in the State of Texas, emphasizing the scope and patterns of implementation of this innovation in the context of a state with comprehensive performance budgeting legislation. The study also reports the perceptions of city budgeters vis-à-vis the external and internal factors that may support the use of performance measures in budgeting at the local level, using survey data from a sample of Texas cities with population over 50,000. The results of the study reveal that although performance laws set up the general framework for performance budgeting, they do not seem to generate a uniform pattern of implementation. Cities in our sample are found at different stages of performance budgeting implementation, and have developed different patterns of budgetary practices.

TRAVEL DELAY OF VEHICLES QUEUE AT A TRAFFIC SIGNAL

Mathematical modeling assumes that the vehicle’s volume has a uniform pattern. Due to traffic lightssettings, the number of vehicles queue grows linearly. The reality, the stochastic arrivals of the vehiclescould be (1) in the randomized arrivals, (2) in the form of groups/ platoon, or (3) in the mixed arrivals. Itis observed that the arrival of the vehicles in the queue tends to have a normal pattern. The objective ofthis research is to study the implications of the arrival categories to the travel delay. For simulation, ituses the numerical method referring to the real state. The result indicates that the calculations of thetravel delay become precise for all vehicles.

Taxonomic revision of the Neotropical genus Telemiades Hübner, [1819 (Lepidoptera: Hesperiidae: Eudaminae), with descriptions of fourteen new species

Telemiades Hübner, [1819] is currently comprised of 22 species and 14 subspecies distributed exclusively in the neotropics. The genus is defined by the morphological pattern of the uncus, apiculus, labial palpi and venation. However, some species have a uniform pattern of coloration making it difficult to establish their correct identity in some cases. The aims of the present study were to present a taxonomic revision of Telemiades Hübner, [1819] in order to provide a stable taxonomic hypothesis for the group, to describe the new species and to present diagnoses to help in species identification. According to the present study, Telemiades is now composed of 41 species. Fourteen new species are recognized and described. Three subspecies are here treated as valid species: T. marpesus (Hewitson, 1876) stat. rest., T. misitheus Mabille, 1888 stat. rest. and T. pekahia (Hewitson, 1868) stat. rest. Two synonyms are treated as valid species: T. insulsus (Draudt, 1922), stat. rev. and T. xantho Hayward, 1939 stat. rev. Five new synonyms are proposed: Plesioneura lamus Mabille, 1888 syn. nov. and Telemiades antiope tosca Evans, 1953 syn. nov. of T. antiope (Plötz, 1882), Echelatus punctatus Mabille & Boullet, 1917 syn. nov. of T. epicalus Hübner, [1819], Proteides nicola Plötz, 1882 syn. nov. of T. laogonus (Hewitson, 1876) and Eudamus phlius Plötz, 1881 syn. nov. of T. nicomedes (Möschler, 1879). To provide stability for existing names, six neotypes were designated for: Proteides amphion Geyer, 1832, Plesioneura compressa Möschler, 1877, Papilio avitus Stoll, 1781, Telegonus mygdon Möschler, 1877, Proteides aesopus Plötz, 1882 and Papilio corbulo Stoll, 1781; and 19 lectotypes for: Aethilla buffumi Weeks, 1906, Eudamus marpesus Hewitson, 1876, Telemiades misitheus Mabille, 1888, Pterygospidea pekahia Hewitson, 1868, Telemiades lurideolus Mabille, 1877, Eudamus laogonus Hewitson, 1876, Eudamus penidas Hewitson, 1867, Telemiades ceramina Herrich–Schäffer, 1869, Telemiades megalloides Schaus, 1902, Pythonides hoyti Weeks, 1906, Eudamus praestes Hewitson, 1876, Telemiades epicalus Hübner, [1819], Eudamus phasias Hewitson, 1867, Telemiades arcturus Herrich–Schäffer, 1869, Echelatus punctatus Mabille & Boullet, 1917, Eudamus centrites Hewitson, 1870, Telegonus gallius Mabille, 1888, Telegonus nicomedes Möschler, 1879, and Arteurotia meris Plötz, 1886.

Tingkat Serangan dan Kehilangan Hasil Akibat Penyakit Grasserie pada Sentra Persuteraan Alam Sulawesi Selatan

Grasserie disease is one of the serious diseases caused by viruses. Its symptoms generally appear in the last instar of silkworm larvae or just before the formation of the cocoon. This study aimed to determine the level of attack, yield losses and dispersal patterns of grasserie at three sericulture center in South Sulawesi, Districs (Wajo, Soppeng and Enrekang). At each location 10 farmers were selected purposively as respondents. Direct observation was conducted to the farmer’s rearing rack (on farmer’s rearing bed) of silkworm using five replications. The results showed that the attack rates of grasserie were categorrised as very slight, ranging from 3.06 to 3.72 kgs of yield losses per each box with a uniform pattern of disease spread. Reared of silkworms in accordance with standard operating procedures can reduce the rate of grasserie disease to avoid losing larger cocoon yields.

Thermometer screens and the geographies of uniformity in nineteenth-century meteorology

By the 1860s a number of thermometer stands, screens and boxes were being used at public observatories and in private settings. The ultimate object of these humble pieces of scientific infrastructure was to protect the thermometers from precipitation and radiation. In response to concerns over the quality of designs and the comparability of results a trial of the various apparatuses was staged at Strathfield Turgiss, Hampshire, in 1868, and subsequent discussions were organized by Britain's Meteorological Society (from 1883 the Royal Meteorological Society). In an attempt to guarantee uniformity of exposure, the Society recommended the adoption of the Stevenson screen, a double-louvred box designed by Thomas Stevenson in 1866. It was promoted as an essential part of the Society's network of second-order and climatological stations across England. Despite the Meteorological Society's aim of overcoming the idiosyncrasies of geography through recourse to a uniform pattern screen, their chosen design ended up embodying a particular geography: the aesthetic and moral codes of the suburban domestic garden.

The Complications of Penal Federalism

This chapter discusses two punishments most often mentioned as examples of American national exceptionalism—capital punishment and imprisonment. It examines the available data on state penal power and patterns of these two most prominent issues implicated in discourse about American penal exceptionalism. The chapter shows that, in each setting, there are huge variations among American states. Moreover, in both cases, the study of interstate variation is a useful method of investigating the causes of penal difference. In the case of imprisonment trends over time, there may also be a nearly uniform pattern that reveals much about the influences of culture and public opinion on penal policy.