Strength analyses of screws for femoral neck fractures

This article represents a multidisciplinary approach to biomechanics (engineering + medicine) in the field of "collum femoris" fractures. One possible treatment method for femoral neck fractures, especially for young people, is the application of cancellous (i.e. lag or femoral) screws (with full or cannulated cross-section) made of Ti6Al4V or stainless steel. This paper therefore aims to offer our own numerical model of cancellous screws together with an assessment of them. The new, simple numerical model presented here is derived together with inputs and boundary conditions and is characterized by rapid solution. The model is based on the theory of beams on an elastic foundation and on 2nd order theory (set of three differential 4th order equations, combination of pressure and bending stress-deformation states). It presents the process for calculating displacements, slopes, bending moments, stresses etc. Two examples (i.e. combinations of cancellous screws with full or cannulated cross-section made of stainless steel or Ti6Al4V material) are presented and evaluated (i.e. their displacement, slopes, bending moments, normal forces, shearing forces and stresses). Future developments and other applications are also proposed and mentioned.Web of Science38583481

Sound to MIDI conversion

Práce se zabývá možnostmi převodu jednoduchého hudebního signálu do MIDI formátu. Obsahuje stručné uvedení do vybraných částí standardu MIDI, které jsou pro tuto problematiku důležité. Dále jsou probrány charakteristicé vlastnosti zvuku, jež je potřeba z hudebního signálu pro zápis do SMF zjistit nebo které jejich zjišťování jistým způsobem ovlivňují. Na konci práce je popsán algoritmus pro převod implementovaný v prostředí Matlab.This thesis deal with possibilities of conversion simple musical signal to MIDI format. It contains brief introduction into chosen parts of MIDI standard which are important for this theme. Further there are examined characteristic attributes of sound which are needed to detect from musical signal to be written in SMF or which affects detection of useful attributes. There is given an account of algorithm for conversion implemented in Matlab.

Evidence - Wiretapping - Extension Telephones

The Supreme Court of Pennsylvania has outlined the prohibitive reach of the wiretap statute as encompassing mechanical invasions over telephone extensions and listening on an extension without the consent of the communicating parties. Commonwealth v. Murray, 423 Pa. 37, 223 A.2d 102 (1966)

Analysis of locking self-taping bone screws for angularly stable plates

Paper focuses on biomechanics, specifically on locking cortical bone screws in angularly stable plates used for the treatment of bone fractures in the medical fields of traumatology and orthopaedics. During extraction of titanium-alloy implants, problems are encountered in an effort to loosen some locking bone screws from the locking holes of an angularly stable plate and the subsequent stripping of the internal hexagon of the screw head. The self-locking of the screw-plate threaded joint was verified by calculation and the effect of the angle of the thread on the head of the locking cortical bone screw on self-locking was evaluated. The magnitude of the torque, causing the stripping of the internal hexagon (the Inbus type head) of a locking cortical bone screw with a shank diameter of 3.5 mm from Ti6Al4 V titanium alloy to ISO 5832-3, was determined experimentally. Also, it was experimentally found that the rotation of the screwdriver end with a hexagonal tip inside the locking cortical bone screw head during stripping of the internal hexagon causes strain of the screw head perimeter and thereby an increase of thread friction. The effect of tightening torque on the possibility of loosening of the locking cortical bone screw from the locking hole of an angularly stable plate was assessed experimentally. From the evaluation of five alternative shapes of locking cortical bone screw heads in terms of the acting stress and generated strains, it follows that the best screw is the screw with the Torx type head, which demonstrates the lowest values of reduced stress and equivalent plastic strain. Based on experiments and simulations the authors recommend that all global producers of locking cortical bone screws for locking holes of angularly stable plates use the Torx type heads, and not heads of the Inbus type or the Square, PH, PZ types.Web of Science37462561

Life Estates - Power to Consume - Remainderman

The Supreme Court of Pennsylvania, applying common law rules of construction, has decided that a life tenant in personalty with the power to consume is accountable to the remainderman for the increased value of the bequeathed property. Moltrup Estate, 424 Pa. 161, 225 A.2d 676 (1967

The New Orleans Museum of Art: An Internship Report

From January through April 2011, I served as an intern at the New Orleans Museum of Art. The New Orleans Museum of Art, which celebrates its 100-year anniversary this year, ranks in the top 100 art museums nationally. I worked in the Marketing Department, focusing on programming and museum communications. The following report includes a profile of the organization, a description of my position as an intern within the Marketing Department, my analysis of internal and external administrative issues, and my recommendations and contributions to the organization based on best practices and relevant museum standards

Trade Regulations - Group Boycott - Restraint of Trade

joint refusal to deal resulting in an exclusion of traders from the competitive market is a per se violation of section 1 of the Sherman Act. United States v. General Motors Corp., 384 U.S. 127 (1966)

Matrix Metalloproteinases MMP-3 and MMP-9 as Predictors of In-Stent Restenosis

The present study aimed to demonstrate the use of matrix metalloproteinases (MMP-2, MMP-3 and MMP-9) as possible additional biochemical predictors of in-stent restenosis (ISR) and determined their reference intervals in adults with respect to gender and age. We included 111 consecutive patients treated at the cathlab of the University Hospital Ostrava, Czech Republic, with ISR within 12 months after implantation of a bare-metal stent. The control group consisted of 111 matched patients with identical main demographic and clinical risk factors. To set the reference intervals for MMPs, we measured the blood concentrations of these analytes in a group of healthy volunteers (N = 180) with an average age of 40–50 years. The enzyme concentrations were measured by immunosorbent assay. Statistical analysis was performed using IBM SPSS Statistics version 22 and MedCalc Version 14.12. We found that increased levels of MMP-3 and 9 were associated with a significant increase in ISR risk. The MMP-9 cut-off value for ISR risk prediction was determined to be ≥64.8 ng/mL. We suppose that screening of these biochemical parameters might be helpful to a more detailed risk stratification of patients after percutaneous coronary interventions, who would be able to benefit from implantation of drug-eluting stents