oalib

OALib Journal期刊

ISSN: 2333-9721

费用:99美元

投稿

时间不限

2019 ( 114 )

2018 ( 892 )

2017 ( 862 )

2016 ( 1310 )

自定义范围…

匹配条件: “P.A.;” ,找到相关结果约584942条。
列表显示的所有文章,均可免费获取
第1页/共584942条
每页显示
Effect Of Flyash On The Mechanical, Thermal, Dielectric,Rheological And Morphological Properties Of Filled Nylon 6  [PDF]
Suryasarathi Bose, P.A. Mahanwar
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2004, DOI: 10.4236/jmmce.2004.32007
Abstract: Fillers are used along with various commodities as well as engineering polymers to improve the properties of polymers. The performance of filled polymers is generally determined on the basis of the interface attraction of filler and polymers. Fillers of widely varying particle size and surface characteristics are responsive to the interfacial interactions with polymers. The present study deals with the effect of particle size and its concentration on the properties of flyash filled nylon 6.
Effect of Particle Size of Filler on Properties of Nylon-6  [PDF]
Suryasarathi Bose, P.A. Mahanwar
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2004, DOI: 10.4236/jmmce.2004.31003
Abstract: Particulate reinforced thermoplastic composites are designed to improve the properties and to lower the overall cost of engineering plastics. In this study the effects of adding mica with variable particle size on the mechanical, thermal, electrical and rheological properties of nylon-6 was investigated. Composites of nylon-6 with varying concentrations (viz. 5 to 40 weights %) of mica were prepared by twin screw extrusion. The composite showed improved mechanical, thermal as well electrical properties on addition of filler. It is also observed that mechanical properties, electrical properties as well as thermal properties increases with decrease in particle size.
Estadística no extensiva de Tsallis en el latido cardiaco de seres humanos sanos
Ritto, P.A.;
Revista mexicana de física , 2011,
Abstract: it is studied the mit-bih normal sinus rhythm database applying to the heartbeat time-series ad hoc, a statistical technique of analysis based on the wavelet and hilbert transforms. with that technique it was previously found, that there is a nonlinear, collective and intrinsic dynamical behavior in the heartbeat during the night and day hours, from 1-64 heartbeats. now it is shown, that using the biorthogonal wavelet bior 3.1 such a behavior reaches the scale 1024 in periods ~ 24 h without being affected by the circadian cycle in its statistic. that result confirms, that the circulatory system is out of equilibrium. furthermore, consistently to the statistics of tsallis, to the healthy human being it corresponds the nonextensive parameter q = 1.70 ± 0.01.
Pectoral spine size in Synodontis schall (Teleostei: Mochokidae) from Asa Lake, Ilorin, Nigeria
Araoye,P.A;
Revista de Biología Tropical , 2000,
Abstract: the pectoral spines of synodontis schall (n = 813) were examined for 24 months. mean length for the right (3.2 cm) and left (3.1 cm) pectoral spines were not significantly different [p 0.05];. however, the male and female pectoral spine lengths were significantly different (p < 0.05). a fractured pectoral spine in one of the specimens was shorter than the other. the fracture which could be deleterious to balancing, feeding and reproductive activities was attributed to an injury rather than to genetic or epigenetic defects.
Physical factors and their influence on fish species composition in Asa Lake, Ilorin, Nigeria
Araoye,P.A;
Revista de Biología Tropical , 2009,
Abstract: the effect of physical factors on fish species composition was studied during 12 months in asa lake, nigeria. fish and water samples were collected bimonthly (march 2003 to february 2004) in the morning. fish samples were caught with gill nets set at the surface and bottom habitats. there were 11 fish families and 21 species. osteoglossidae, anabantidae, channidae, schilbedae and cyprinidae were rare and occurred seasonally in fishermen catches, while mormyridae, cichlidae, mochokidae, characidae, bagridae and clariidae showed less variation and were more common. characidae and cichlidae were the most abundant (23.0 and 18.6% respectively) while osteoglossidae, channidae and anabantidae were the least (1.7, 2.1 and 2.3% respectively). clariidae and mormyridae had the highest weight with 16.0% and 12.3% respectively, while anabantidae had the lowest (3.4%). surface water temperatures were generally higher than air temperatures during the afternoon, except from january to march when air temperatures were high (28.1 to 28.7 oc) due to low relative humidity (39 to 70%). in the morning, surface water temperatures (25.5 to 26.3 oc) became higher than air temperatures (25.2 to 26.0 oc) from may to december, when relative humidity values were also high (50 to 88%). the differences between surface and bottom water temperatures was generally higher (0.7 to 3.1 oc; p < 0.05) in the afternoon (0.2 to 0.8 oc) due to sunlight. temperature differences in the surface and bottom waters were usually higher during the dry season (p < 0.05), for similar reasons. captures were higher in the dry season when the fish concentrated in the warmer, steadier and scarcer water. minimal and maximal temperatures were different for surface and bottom waters (p < 0.05). however, there were no marked variations in temperature patterns or species distribution. rev. biol. trop. 57 (1-2): 167-175. epub 2009 june 30.
Man-made lakes, ecological studies and conservation needs in Nigeria
Araoye,P.A.;
Revista de Biología Tropical , 2002,
Abstract: the benefit derived from the creation of man-made lakes in nigeria and other developing countries is usually associated with great risks. whenever we establish a dam, it appears we dam the inherent consequences to the detriment of man and bis environment. debts were incurred by the countries concerned, man and animals were displaced, arable lands destroyed including degradation of forest and wild life resources. the creation of dams have also ignored the prevention of man and bis life stock from the inherent spread of water borne diseases. the purpose for which a dam is created is threatened if man is indiscriminately exposed to the risk of water borne diseases. the poor and uneconomic management of the fish resources is also another major issue of concern. in order to tap the full potentials of reservoir projects and to promote conservation, it is important to have a round table talk involving all stake holders during the planning stage of such projects. therefore apart from the engineering works, there is also need for collaboration with all experts from relates fields especially the biologists, sociologists and economists for bio-socio-economic reasons during the planning and implementation stages of dam projects in nigeria and other developing countries.
On Issues of Labelling in the "Dictionnaire Fran ais–Mpongwé": A Case-study
P.A Mavoungou
Lexikos , 2005,
Abstract: Dictionaries contain lexicographic data whose occurrence is restricted to certain geo-graphical areas, subject fields, professions, etc. It is part of the duties of the lexicographer to give an account of such deviations to ensure a successful retrieval of the information on the part of the user. This contribution presents a discussion on labelling issues in the Dictionnaire Fran ais–Mpongwé. Although the main focus is on the presentation of different types of labelling as well as problems in labelling, textual condensation procedures and mediostructural representations (to-gether with some aspects of the user perspective) are also critically evaluated. It is shown that these procedures reveal some inconsistencies which are not accounted for in the outer texts (front matter and back matter texts) of the dictionary. Finally suggestions are made for the improvement of the access structure of this dictionary.
Gedandedi sa Geviya/ Dictionnaire Geviya–Fran ais
P.A Mavoungou
Lexikos , 2004,
Abstract: No L.J. van der Veen et S. Bodinga-bwa-Bodinga. Gedandedi sa Geviya/ Dictionnaire Geviya–Fran ais. 2002, 569 pp. ISBN 90-429-1105-0 (Peeters Louvain)/ISBN 2-87723-621-8 (Peeters France). Louvain/Paris/Sterling, Virginia: Peeters. Price: €60.
Synopsis articles in the planning of a trilingual dictionary: Yilumbu– French–English
P.A Mavoungou
Lexikos , 2002,
Abstract: A distinction is often drawn between single articles and synopsis articles. A single article is the so-called default article. It does not deviate from the traditional microstructural approach of the dictionary because it presents the minimum data for each lemma sign treated, while a synopsis article gives additional data for each treated lemma. The classical conception of the synopsis article originates with Bergenholtz, Tarp and Wiegand (1999). In their view, synopsis articles which were devised for language for special purposes (LSP) dictionaries have to make provision for the treatment of lemma signs functioning as superordinate terms (general lemmata or topics) as well as their hyponyms. The aim of this article is to present a new lexicographic approach to the study of synopsis articles against the background of a planned trilingual dictionary. It will be shown that synopsis articles have a more general use than its restricted application in LSP dictionaries. In fact, the focus will not be on the treatment of technical or scientific vocabulary but rather on cultural terms. This article also raises among other things, questions about the purpose of the planned dictionary, its target users, different types of microstructures as well as different data categories to be included in synopsis articles.
Performance of Growing-Finishing Pigs Fed Diets Containing Normal or Low Lignin-High Fat Oat Processed Using a Hammer Mill or Roller Mill
Thacker, P.A.
Journal of Animal and Veterinary Advances , 2012,
Abstract: The objectives of the following study were to compare a recently developed low lignin- high fat oat with regular oat as an energy source for use in diets fed to growing-finishing pigs and to compare hammer milling and roller milling as methods of processing oats. A total of 40 crossbred grower pigs (20 barrows and 20 gilts) were assigned to one of five dietary treatments in a factorial design experiment. The control diet was formulated using barley and soybean meal while four experimental diets were formulated in which 40% of either normal or low lignin-high fat oat was substituted for barley. The oats were either ground or rolled. Particle size analysis indicated that the average particle size of the grower diets was 884, 1037, 1420, 1031 and 1501 m while for the finisher diets, the average particle size was 800, 869, 1250, 854 and 1098 m for the barley, ground normal oat, rolled normal oat, ground low lignin-high fat oat and rolled low lignin-high fat oat diets respectively. Digestibility coefficients for pigs fed ground oats were significantly (p<0.05) higher than those for pigs fed rolled oat while there was no difference (p>0.05) in nutrient digestibility between pigs fed normal and low lignin-high fat oat. During the growing period (35.1 to 71.4 kg) as well as over the entire experiment (35.1 to 112.5 kg), there were no differences (p>0.05) in daily gain, feed intake or feed conversion between pigs fed normal or low lignin-high fat oat or between pigs fed ground or rolled oat diets. During the finishing period (71.4 to 112.5 kg), feed intake and feed conversion were poorer (p<0.05) for pigs fed the low lignin-high fat oat compared with the barley diet. There were no differences in carcass traits between pigs fed normal and low lignin-high fat oat or between pigs fed rolled and ground oats. The overall results of this experiment indicate that both normal and low lignin-high fat oat can substitute for barley at levels as high as 40% of the diet without hindering pig performance. Since the average yield of oat can be equal or higher than barley with lower input costs, a re-examination of feeding recommendations regarding oat in swine rations seems warranted. In addition, since pig performance and carcass traits were not affected by processing method and roller mills have been shown to have lower-energy requirements, lower maintenance costs, quieter operation, and more exact control of particle size than hammer mills, there may be some advantage for pig producers to consider roller mills rather than hammer mills for use in processing pig feeds.
第1页/共584942条
每页显示


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.