Search results for "CEM"
showing 10 items of 3487 documents
Cardiovascular Disease and SERMs
2006
Accuracy of stereotactic coordinate transformation using a localisation frame and computed tomographic imaging
1999
The accuracy of coordinate transformation from a CT image to a stereotactic frame was investigated for stereotactic systems using a localisation frame and matrix-based coordinate transformation. The main source of error influencing calculation was input data, due to inaccurate calculation of the centres of the rods of the localisation frame in the CT image, and the propagation of this input error during subsequent matrix calculation. Systemic errors during matrix calculation do not exist, and rounding off errors were of subordinate importance compared to the input data error. The influence of input data error on coordinate transformation was studied by geometric methods, computer simulation…
Effect of the lack of primary stability in the survival of dental implants
2018
Background The survival of dental implants has been linked to primary stability. The aim of this study is to analyse the factors that influence the survival of dental implants placed without primary stability. Material and methods A cohort study of implants placed without primary stability was carried out between September 2011 and July 2016. All cases with registered information on the patient and surgical intervention were used. Cases that did not have a 12-month follow-up after implant placement were excluded. Results Out of 2,400 analysed implants, 92 were placed without primary stability. The absence of primary stability was classified as B in 49 cases, C in 38 cases and D in 5 cases. …
Sensorless control of permanent magnet synchronous motors for wide speed range applications
2006
This paper deals with sensorless control of Interior Permanent Magnet Synchronous Motors (IPMS) based on the estimation of speed and rotor angular position. The above estimate is based on the injection of high frequency stator currents able to generate a signal similar to that generated by a resolver connected to the axis of the motor. A new digital algorithm has been designed to demodulate the above signal whose implementation can be carried out on the same DSP that processes the control algorithm. In this paper a new scheme of speed and angular position estimator is proposed and justified on the theoretic point of view. The experimental results here shown validate the effectiveness of the…
Digital Hydraulic Winch Drives
2018
This paper presents the planned use of digital displacement high torque low speed motors to drive large winches in off-shore and maritime applications. The digital displacement technology uses forced actuation of high- and low pressure valves for each cylinder chamber, i.e. valves are opened and closed by actuation forces independently of cylinder pressure and supply pressures. Motors equipped with the technology are well suited for low speed secondary controlled operation including start and stop. It also enables unloading of motor cylinders that are not needed to produce torque, whereby excellent efficiency at partial displacement is obtained. A research project on application of multi di…
Use of Caffeine for Cognitive Enhancement
2015
Abstract Pharmacological cognitive enhancement (CE) refers to the use of divergent psychoactive substances with the purpose of enhancing one's own cognition (e.g., increasing vigilance, concentration, memory). The group of substances for CE includes divergent over-the-counter drugs. Caffeine-containing products such as coffee, caffeinated drinks, and caffeine tablets are integral part of this group of substances. Furthermore, prescription drugs as well as illicit drugs belong to this group of CE substances (e.g., [psycho-]stimulants, modafinil). The use of caffeine in normal healthy subjects has very limited procognitive effects. However, there are few procognitive effects in healthy but sl…
Survival of implants placed with the osteotome technique : an update. Review
2012
A literature review is made to analyze the survival of implants placed with the osteotome technique. A PubMed search was made based on the key words “osteotome AND dental implants”, corresponding to publications between 1998-2008. The inclusion criteria were: a) a minimum of 10 patients; b) a minimum follow-up of 6 months; c) implants placed using the osteotome technique with or without indirect sinus lift; and d) specification of the implant number and survival rate. Sixty-four articles were identified, of which 20 met the inclusion criteria. A total of 2006 implants were placed in 1312 patients using the osteotome technique. The duration of follow-up after prosthetic loading ranged from 6…
Sepsis in head and neck cancer patients treated with chemotherapy and radiation: literature review and consensus
2015
Abstract: The reporting of infection/sepsis in chemo/radiation-treated head and neck cancer patients is sparse and the problem is underestimated. A multidisciplinary group of head and neck cancer specialists from Italy met with the aim of reaching a consensus on a clinical definition and management of infections and sepsis. The Delphi appropriateness method was used for this consensus. External expert reviewers then evaluated the conclusions carefully according to their area of expertise. The paper contains seven clusters of statements about the clinical definition and management of infections and sepsis in head and neck cancer patients, which had a consensus. Furthermore, it offers a revie…
Optimization of CASA-Mot Analysis of Donkey Sperm : optimum Frame Rate and Values of Kinematic Variables for Different Counting Chamber and Fields
2020
In order to optimize the donkey sperm motility analysis by the CASA (Computer Assisted Sperm Analysis)-Mot system, twelve ejaculates were collected from six jackasses. Capillary loaded chamber (CLC), ISAS®
L'incidence de la fiscalité sur l'évolution des structures d'endettement des entreprises françaises
2003
The principal purpose of this paper is to determine the incidence of the corporate income taxes which explains directly or indirectly (with an incidence on the traditional variables of the determination of capital structures) the global evolution of capital structures of french firms over the period 1988 and 1998. We provide too the possible reason which justifies why some firms have an evolution of capital structure in the opposite direction or in attenuated way in comparison with the general tendency.