Kikuchi''s histiocytic necrotizing lymphadenitis associated with ruptured silicone breast implant

Mortality rates and injuries requiring medical treatment associated with sports and exercise are generally low. However, higher injury rates are reported for athletes and members of sports clubs. This study focuses on the sport- and exercise-related injury rate for various age and sex groups in the general population and how sport and exercise injury rates compare with those for other activities. The data presented are based on telephone interviews. Of the participants (N = 6,596), 335 (5.1%) reported having sustained an injury in the previous month; 46% of injuries among males and 14% of those among females were sport or exercise related. The data show a downward trend in sport- and exercise-related injury rates with increasing age. It is concluded that, as a proportion of all injuries sustained, the sport- and exercise-related injury rate is high, particularly among males. Possible future research on sport- and exercise-related injuries is discussed.     

A positive systems model of TCP-like congestion control: asymptotic results

We study communication networks that employ drop-tail queueing and Additive-Increase Multiplicative-Decrease (AIMD) congestion control algorithms. It is shown that the theory of nonnegative matrices may be employed to model such networks. In particular, important network properties, such as: 1) fairness; 2) rate of convergence; and 3) throughput, can be characterized by certain nonnegative matrices. We demonstrate that these results can be used to develop tools for analyzing the behavior of AIMD communication networks. The accuracy of the models is demonstrated by several NS studies.     

Efficient solution of modal equations with arbitrary loadings

Commonly time-varying loadings such as wind, waves and earthquakes which act on engineering structures are specified in the form of discrete time-series. The dynamic response of a linear structural system when subjected to such inputs may be computed by modal analysis techniques. These methods require the solution of a set of uncoupled second-order linear ordinary differential equations with constant coefficients. Implicit to any solution used, however, is the requirement that the original loading be matched exactly or approximated closely by a continuous time-function. Frequently a piecewise linear interpolation of the discrete input data is adopted. This paper presents superior local interpolations which have been derived and optimised by considerations in the frequency domain. These local interpolations of the input are then subsequently used in conjunction with an exact solution to the modal equations. This implies that errors are due solely to the limitations of the interpolating process, a feature absent from numerical integration methods. By the use of discrete time-systems theory and the $\text{z}$ transform some simple recursive algorithms are derived for the solution of the modal equations. These algorithms, which operate linearly on the loading data, can be made very accurate, are unconditionally stable and are suitable for use with a hand calculator.The paper concludes with sections on methods of processing the discrete time-series loading data so as to increase or decrease the sample time step length. Increasing the step length can economise analysis when only low frequency components are of interest. Reducing the step length by inserting intermediate values is advantageous when high frequency components in the solution are of importance and in the direct solution of the matrix equations of motion. Simple but effective digital filters are specified for these operations, and in the case of sample rate increase (digital interpolation) the filters are much superior to linear interpolation.     

The application of near infrared reflectance analysis to rapid flour testing

Calibrations are presented for the analysis of flour for protein, moisture, particle size, colour and starch damage by means of near infrared (NIR) reflectance analysis. A commonly used NIR instrument was subjected to a thorough evaluation for its accuracy in flour testing for these parameters, by comparison of NIR with existing methods of analysis over an extensive period of time. The accuracy and precision of NIR for the parameters studied were satisfactory for quality control purposes and therefore the technique has an important place in the rapid flour testing.     

RETARDATION OF DROPLET MOTION BY SURFACTANT. PART 2. NUMERICAL SOLUTIONS FOR EXTERIOR DIFFUSION, SURFACE DIFFUSION, AND ADSORPTION KINETICS

The coupled fluid mechanics and mass transfer problems for the retardation by surfactant of an essentially spherical droplet in creeping flow are solved simultaneously. The mass transfer mechanisms of diffusion in the exterior liquid, surface diffusion, and adsorption kinetics are treated separately. No assumptions are made concerning the form of the velocity profile. The solutions are obtained by collocation methods with Newton iteration. The velocity profile and concentration distribution are improved simultaneously, not alternately. The numerical results reveal as limiting cases the uniformly retarded and stagnant cap interfacial velocity profiles considered previously.     

Top-down design within a functional environment

This paper describes a design tool for use within the INTERLISP1 environment. The design tool, DT, is based upon the design methodology described by the general term, top-down design and is novel in that it attempts to apply this design method to a functional programming environment. Also novel is the method whereby the generation of the design can occur in parallel with the implementation of the design. This allows a design process more in accord with the needs of functional programmers.     

Use of trigonometric interpolation for the analytical determination of the dynamic response of linear systems to arbitrary inputs

Commonly the loadings associated with the dynamic excitation of structural systems are expressed in the form of discrete time series. By the use of trigonometric interpolation these inputs may be transformed into continuous time functions. The dynamic response of a linear structural system when subjected to such inputs may be computed by modal analysis techniques. These methods require the solution of a set of uncoupled second-order linear ordinary differential equations with constant coefficients. The trigonometric interpolation function is a finite series of sine and cosine terms and hence it becomes a straightforward matter to solve the set of uncoupled differential equations for the displacements. Solutions obtained in this manner are also seen to be continuous functions expressed as finite series in sines and cosines. The associated velocities and accelerations may be easily obtained by differentiation of these expressions. The method is also free from the errors inherent in step-by-step integration methods, and the errors in the numerical determination of Duhamel integrals.The derivation of the coefficients of the time-series inputs and of the final evaluation of the dynamic response are both executed by a simple recursive algorithm which is fast and accurate.Since the only errors occur in the initial expression of the input a finite series of elementary functions—and these errors can be made very small—the method is a novel and attractive alternative to existing procedures. It is illustrated here by the computation of the dynamic response of a skeletal space frame when subjected to earthquake ground motions.     

Phase Relations and Crystal Structures of Zn and Cd Tungstates

The systems ZnO-WO₃ and CdO-WO₃ show similar phase relations, each having a 1:1 phase. Invariant points established are 1182°C and 56 mol% ZnO, 1090° and 34 mol% ZnO, and 1105° and 31.5 mol% CdO. The crystal structure of CdWO₄, determined by the single-crystal method, was isostructural with ZnWO₄, a wolframite type. Cell dimensions are a =0.5013, b = 0.5090, and c = 0.5866 nm and γ= 91.46° with a space group P 2/ b and Z = 2. The measured and calculated densities are 7.83 and 7.79 g/cm³, respectively. ZnWO₄ and CdWO₄ formed a complete series of solid solutions at 900° to 1160°C, above which melting occurred.     

CONTRIBUTIONS OF PROJECTIVE TECHNIQUES TO ASSESSMENT OF MANAGEMENT POTENTIAL.

THE CONTRIBUTIONS OF PROJECTIVE TECHNIQUES TO ASSESSMENT-CENTER STAFF EVALUATIONS AND THE RELATIONSHIPS OF PROJECTIVE VARIABLES TO PROGRESS IN MANAGEMENT ARE PRESENTED. THE PROJECTIVE DATA WERE OBTAINED BY CODING REPORTS WRITTEN BY A CLINICAL PSYCHOLOGIST FROM 3 PROJECTIVE INSTRUMENTS. ANALYSES OF THE DATA SHOW THAT THE PROJECTIVE REPORTS PARTICULARLY INFLUENCED THE ASSESSMENT STAFF IN RATING SUCH CHARACTERISTICS AS WORK MOTIVATION, PASSIVITY, AND DEPENDENCY. IN ADDITION, SEVERAL OF THE PROJECTIVE VARIABLES ARE RELIABLY RELATED TO PROGRESS IN MANAGEMENT, ESPECIALLY THOSE PERTAINING TO LEADERSHIP AND ACHIEVEMENT MOTIVATION. THE FINDINGS CLEARLY INDICATE THAT RELEVANT INFORMATION ON MANAGERIAL MOTIVATION WAS OBTAINED FROM THE PROJECTIVE REPORTS. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

An Evaluation of Detectors for a Cerenkov Ring-Imaging Chamber

We report results from an ongoing study of single photon detectors for use in a ring-imaging Cerenkov counter. New results on the operation of parallel plate avalanche gaps is presented.