Vibration transmission through rolling element bearings in geared rotor system, part 1

A mathematical model is proposed to examine the vibration transmission through rolling element bearings in geared rotor systems. Current bearing models, based on either ideal boundary conditions for the shaft or purely translational stiffness element description, cannot explain how the vibratory motion may be transmitted from the rotating shaft to the casing. This study clarifies this issue qualitatively and quantitatively by developing a comprehensive bearing stiffness matrix of dimension 6 model for the precision rolling element bearings from basic principles. The proposed bearing formulation is extended to analyze the overall geared rotor system dynamics including casing and mounts. The bearing stiffness matrix is included in discrete system models using lumped parameter and/or dynamic finite element techniques. Eigensolution and forced harmonic response due to rotating mass unbalance or kinematic transmission error excitation for a number of examples are computed

A review of gear housing dynamics and acoustics literature

A review of the available literature on gear housing vibration and noise reduction is presented. Analytical and experimental methodologies used for bearing dynamics, housing vibration and noise, mounts and suspensions, and the overall geared and housing system are discussed. Typical design guidelines as outlined by various investigators are given

Vers une théorie intégrée de la phonologie et de la morphologie

Dans cet article, on tente de faire une récapitulation des résultats de la recherche affectuée par l’auteur et son collaborateur, A. Ford, afin de comprendre, dans l’ordre, la nature et la structure de la phonologie et de la morphologie. La présentation de ces résultats, disponibles dans les diverses publications résumées ici, est précédée de brefs commentaires portant sur des questions conceptuelles concernant la phonologie et la morphologie. Elle est suivie d’une discussion à propos des conséquences que ces résultats entraînent. L’accent est mis sur les questions conceptuelles. La conclusion générale qui se dégage est que nous devons changer radicalement notre façon de penser lorsqu’il s’agit de phonologie et de morphologie.An attempt is made in this paper to summarize the results of the research undertaken by the author and his collaborator, A. Ford, in order to understand the nature and structure of phonology and morphology. The presentation of these results, available in various publications summarized here, is preceded by some brief comments pertinent for some relevant conceptual issues in phonology and morphology and followed by a discussion of some of the consequences of these results. The focus is throughout on conceptual matters. The general conclusion is that we need to think about phonology and morphology in radically different ways

Vers une théorie phonotactique générative

Malgré la réfutation décisive par Shibatani (1972 et 1973) et Sommerstein (1974 et 1977) des arguments de Postal (1969) contre la possibilité et la nécessité de formuler des contraintes phonotactiques, l’argument portant sur la redondance semble toujours valable, même si on élimine les contraintes de structure morphématique (CSM) (Kiparsky 1982). L’objectif de cet article est de démontrer que la réponse appropriée à l’argument de la redondance de Postal est d’éliminer les règles phonologiques. Je maintiendrai que toutes les alternances vraiment phonologiques sont gouvernées par des conditions de bonne formation (CBF) formulées, disons, à la façon de Selkirk (1982), et que ces CBF déclenchent une stratégie parmi un ensemble universel de stratégies de réparation afin de corriger les violations au moment et à l’endroit où elles se produisentAlthough Postal's (1968) arguments against the statability and necessity of phonotactic constraints have been effectively answered by Shibatani (1972, 1973) and Sommerstein (1974, 1977), his redundancy argument is still valid, even if Morpheme Structure Conditions (MSC) are eliminated (cf. Kiparsky 1982).Despite Venneman's (1974) construal of phonological rules as WeIl-Formedness Conditions (WFC), Stampe's (1979) insistence that WFC's are merely the products of processes, and Stanley's (1967) and Kiparsky's penetrating studies of the duplication problem, all contemporary theories of phonology continue to use both rules and WFC's. The purpose of this paper is to argue that the appropriate response to Postal's redundancy objection is to eliminate phonological rules. I shall argue that all truly phonological alternations are governed by WFC's stated, say, à la Selkirk (1982), and that these WFC's trigger one of a universal set of repair strategies to fix or alleviatetheir violations as and when they arise

Two Morphological Notes: A Sharp and a Flat

The purpose of this note is to discuss the possibility of relating the lexicon as a unique address and eliminating exceptionality from morphology, both somewhat threatened by some current proposals.Cet article vise la possibilité de conserver le lexique comme lieu unique et d’éliminer « l’exceptionnalité » de la morphologie, chacun étant en quelque sorte menacé par certaines hypothèses actuellement en vogue

Towards Information Polycentricity Theory: Investigation of a Hospital Revenue Cycle

This research takes steps towards developing a new theory of organizational information management based on the ideas that, first, information creates ordering effects in transactions and, second, that there are multiple centers of authority in organizations. The rationale for developing this theory is the empirical observation that hospitals have great difficulty in managing information relating to transactions with patients. The research illustrates the detailed workings of an initial conceptual framework based on an action research project into the revenue cycle of a hospital. The framework facilitates a deeper understanding of how information technology can help to transform information management practices in complex organizations, such as hospitals. At the same time, this research adds to the literature on Polycentricity Theory by linking its two core concepts—multiple nested centers of decision making and context-dependent governance—with Transaction Cost Theory and information management theories to establish a new foundation for understanding the role of information technology in organizational contexts

Adhatoda vasica (Vasaka): A Medicinal Boon for Mankind

Leaf of Adhatoda vasica (Vasaka) is an important drug of Ayurveda, prescribed as an expectorant. Quinazoline alkaloids present in the leaves are established as active principles. In Ayurveda, its leaf juice (Vasa swarasa) is incorporated in many formulations. Adhatoda vasica is a herb, also popularly known as Malabar nut in English, Adosa in Hindi and Vasaka in Sanskrit is used as botanicals against root knot nematodes. Parts of this plant used as medicinal value are leaves, roots, flower and stem bark. The leaves of Adhatoda vasica contain phytochemicals such as alkaloids, tannins, saponins, phenolics and flavonoides. Several alkaloids are present in the leaves. The most important is vasicine, a quinazoline alkaloid responsible for the medicinal activity of the plant. It has been used in preparation of herbal medicines for the past 2000 years. Adhatoda vasica is also used to relieve respiratory disorders and cough. The herb is often grown as a hedge and its leaves and twigs are utilized as green- manure. Inspite of its use in medicinal value it has a good nematicidal properties

A Review on Palm Print Recognition System

Biometrics based authentication and recognition system helps to identify individuals based on various behavior and physical characteristics, which can be used for their unique personal identifications. Various physical characteristics like iris patterns, facial features, fingerprint patterns, retina patterns, palmprint patterns etc. are utilized for such identification purposes, Palm print recognition is counted as most suitable and reliable biometric recognition system because of its merits, such as user friendliness, low cost, high accuracy and high speed. A system that uses palmprint as recognize individuals involves the matching of the various principal lines, creases and wrinkles on the palm surface. Since the random orientations of muscles and tissues of the hand create the palmprint patterns during birth, these patterns are unique so no two palmprint patterns are exactly same for any individuals. This paper provides a detailed overview of palmprint recognition approaches, by describing the various steps and processing involve in palmprint identification