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Scaling Procedure (scaling + procedure)
Selected AbstractsThe comparison of the effects of three types of piezoelectric ultrasonic tips and air polishing system on the filling materials: an in vitro studyINTERNATIONAL JOURNAL OF DENTAL HYGIENE, Issue 4 2007T Arabaci Abstract:, Aim:, The aim of this study was to evaluate the effect of air polishing and different ultrasonic scaler inserts on dental fillings, such as amalgam, composite and porcelain. Materials and methods:, This study was performed on amalgam, composite and porcelain samples. The surfaces of the samples were exposed to different type of piezoelectric ultrasonic scaler inserts and air-abrasive unit. The scaler inserts were Instrument A, Instrument PS and PI. The roughness of the surfaces of each sample were measured with a profilometer and observed by stereomicroscope. Results:, The stereomicroscopic images and profilometric values showed that Instrument A and PS resulted in rough surfaces, such as chips, nicks and scratches on the amalgam, composite and porcelain surfaces. The Instrument PI roughened the amalgam surface, but it did not roughen the porcelain or composite surfaces. The profilometric measurements (Ra) showed that the roughness of the surfaces depending on air polishing was less than the ultrasonically scaled surfaces. Conclusion:, The wrong tip applications during dental scaling procedure cause roughness, such as scratches, nicks or chips, not only on the teeth surfaces but also on the filling materials. Thus, dental scaling procedure on the restorations should be performed carefully and the roughness sites on the restorations have to be re-polished after scaling to prevent plaque accumulation. [source] The influence of prior offender/victim relationship on offender stalking behaviorJOURNAL OF INVESTIGATIVE PSYCHOLOGY AND OFFENDER PROFILING, Issue 2 2004Renee M. Groves The present study examined the influence of prior offender/victim relationship on offender stalking behavior. The actions that were present within the stalking offences were recorded using content analysis of victim and witness statements, and all other relevant material within the police files of 50 stalking cases. The sample was analyzed using a non-metric multidimensional scaling procedure known as Smallest Space Analysis. The results suggested that when a prior sexual relationship existed between the offender and the victim the offender was more likely to engage in a majority of controlling style actions. However, an offender who did not have a prior sexual relationship with the victim was more likely to engage in a majority of infatuation style actions. Therefore, the study lends support to the influence of prior relationship on the actions that offenders engage in over the stalking period. Implications of the study and future research ideas are discussed. Copyright © 2004 John Wiley & Sons, Ltd. [source] Interspecies allometric scaling: prediction of clearance in large animal species: Part II: mathematical considerationsJOURNAL OF VETERINARY PHARMACOLOGY & THERAPEUTICS, Issue 5 2006M. MARTINEZ Interspecies scaling is a useful tool for the prediction of pharmacokinetic parameters from animals to humans, and it is often used for estimating a first-time in human dose. However, it is important to appreciate the mathematical underpinnings of this scaling procedure when using it to predict pharmacokinetic parameter values across animal species. When cautiously applied, allometry can be a tool for estimating clearance in veterinary species for the purpose of dosage selection. It is particularly valuable during the selection of dosages in large zoo animal species, such as elephants, large cats and camels, for which pharmacokinetic data are scant. In Part I, allometric predictions of clearance in large animal species were found to pose substantially greater risks of inaccuracies when compared with that observed for humans. In this report, we examine the factors influencing the accuracy of our clearance estimates from the perspective of the relationship between prediction error and such variables as the distribution of body weight values used in the regression analysis, the influence of a particular observation on the clearance estimate, and the ,goodness of fit' (R2) of the regression line. Ultimately, these considerations are used to generate recommendations regarding the data to be included in the allometric prediction of clearance in large animal species. [source] A behavioural investigation of human visual short term memory for colourOPHTHALMIC AND PHYSIOLOGICAL OPTICS, Issue 5 2010V. A. Nemes Abstract We examined visual short term memory (VSTM) for colour using a delayed-match-to-sample paradigm. In these experiments we measured the effects of increasing inter-stimulus interval (ISI), varying between 0 and 10 s, on the ability of five colour normal human observers to make colour matches between a reference and subsequently presented test stimuli. The coloured stimuli used were defined by different chromatic axes on the isoluminant plane of DKL colour space. In preliminary experiments we used a hue scaling procedure to identify a total of 12 colour stimuli which served as reference hues in the colour memory experiments: four stimuli were exemplars of red, green, blue and yellow colour appearance categories, four were located between these categories and a further four were located on the cardinal axes that isolated the activity of the cone-opponent mechanisms. Our results demonstrate that there is a reduction in the ability of observers to make accurate colour matches with increasing ISIs and that this reduced performance was similar for all colour stimuli. However, the shifts in hue that were measured between the reference and matched test stimuli were significantly greater for the cardinal stimuli compared to those measured for the stimuli defined by the hue scaling procedure. This deterioration in the retention of hue in VSTM for stimuli that isolate cone-opponent mechanisms may be a reflection of the reorganisation of colour processing that occurs in the cortex where colour appearance mechanisms become more prominent. [source] Police officers' views of effective interview tactics with suspects: The effects of weight of case evidence and discomfort with ambiguityAPPLIED COGNITIVE PSYCHOLOGY, Issue 4 2009Helinä Häkkänen This study examined the effects of case-specific facts and individual discomfort with ambiguity (DA) on investigators' beliefs concerning effective interviewing tactics for suspects. Violent crime investigators (n,=,30) responded to a questionnaire including the Need for Closure Scale (NFCS) and ratings of the importance of 39 interrogation tactics in two hypothetical interrogations with a homicide suspect, where the evidence consisted of either technical evidence or soft information. Twenty tactics were analysed with a multidimensional scaling procedure which confirmed two discrete interviewing themes: humane and dominant. More tactics, both dominant and humane, were rated as important if the evidence was soft compared with technical. In the soft evidence condition, investigators who were high on DA rated both types of tactics as more important than did low-DA investigators. In the technical evidence condition, no such difference emerged. Copyright © 2008 John Wiley & Sons, Ltd. [source] A robust bulk-solvent correction and anisotropic scaling procedureACTA CRYSTALLOGRAPHICA SECTION D, Issue 7 2005Pavel V. Afonine A reliable method for the determination of bulk-solvent model parameters and an overall anisotropic scale factor is of increasing importance as structure determination becomes more automated. Current protocols require the manual inspection of refinement results in order to detect errors in the calculation of these parameters. Here, a robust method for determining bulk-solvent and anisotropic scaling parameters in macromolecular refinement is described. The implementation of a maximum-likelihood target function for determining the same parameters is also discussed. The formulas and corresponding derivatives of the likelihood function with respect to the solvent parameters and the components of anisotropic scale matrix are presented. These algorithms are implemented in the CCTBX bulk-solvent correction and scaling module. [source] Advances in the treatment of root dentine sensitivity: mechanisms and treatment principlesENDODONTIC TOPICS, Issue 1 2006D.G. GILLAM There are limited studies specifically on the prevalence of root dentine hypersensitivity or root sensitivity per se; most of the published information relates to the prevalence of dentine hypersensitivity (DH). Several investigators have suggested that there may be some justification on the basis of differing pathologies of distinguishing between those individuals complaining of DH who have relatively healthy mouths with those who complain of DH as a result of periodontal disease and/or its treatment. It is generally recognized that those individuals diagnosed with periodontal disease and having periodontal therapy including scaling procedures may have a higher prevalence than those who present with healthy mouths and evidence of gingival recession. The availability of a vast array of treatments, however, would indicate either that there is no one effective desensitizing agent for completely resolving the discomfort or that the condition, due to its highly subjective nature, is difficult to treat irrespective of the available treatment options. The importance of implementing preventative strategies in identifying and eliminating predisposing factors in particularly erosive factors (e.g. dietary acids) cannot be ignored if the practitioner is going to treat this troublesome clinical condition successfully. This paper will review the published literature and provide information as to the prevalence of the condition, its etiology and causal factors, as well as recommendations for the clinical management of the problem. [source] Benzonitriles: Survey of their importance and scaling of their vibrational frequenciesINTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY, Issue 4 2003M. Alcolea Palafox Abstract This work provides a short survey of the studies carried out on benzonitrile and its derivatives, with special attention on a spectroscopic point of view. The importance and main applications of these molecules are also briefly indicated. For an accurate assignment of their vibrational spectra, the scaling procedures for the wave numbers are described. For this purpose, the performance of semiempirical, ab initio, and density functional methods, with different basis sets, is determined. A "resume" of the main scaling factors to be used in the calculated wave numbers is shown. The results obtained for several benzene derivatives, and in particular for four benzonitriles, are analyzed. © 2003 Wiley Periodicals, Inc. Int J Quantum Chem 94: 189,204, 2003 [source] | ||||||||||||||||