991 resultados para 1995_12100603 Optics-12


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Background Studies investigating the relationship between malnutrition and post-discharge mortality following acute hip fracture yield conflicting results. This study aimed to determine whether malnutrition independently predicted 12-month post-fracture mortality after adjusting for clinically relevant covariates. Methods An ethics approved, prospective, consecutive audit was undertaken for all surgically treated hip fracture inpatients admitted to a dedicated orthogeriatric unit (November 2010–October 2011). The 12-month mortality data were obtained by a dual search of the mortality registry and Queensland Health database. Malnutrition was evaluated using the Subjective Global Assessment. Demographic (age, gender, admission residence) and clinical covariates included fracture type, time to surgery, anaesthesia type, type of surgery, post-surgery time to mobilize and post-operative complications (delirium, pulmonary and deep vein thrombosis, cardiac complications, infections). The Charlson Comorbidity Index was retrospectively applied. All diagnoses were confirmed by the treating orthogeriatrician. Results A total of 322 of 346 patients were available for audit. Increased age (P = 0.004), admission from residential care (P < 0.001), Charlson Comorbidity Index (P = 0.007), malnutrition (P < 0.001), time to mobilize >48 h (P < 0.001), delirium (P = 0.003), pulmonary embolism (P = 0.029) and cardiovascular complication (P = 0.04) were associated with 12-month mortality. Logistic regression analysis demonstrated that malnutrition (odds ratio (OR) 2.4 (95% confidence interval (CI) 1.3–4.7, P = 0.007)), in addition to admission from residential care (OR 2.6 (95% CI 1.3–5.3, P = 0.005)) and pulmonary embolism (OR 11.0 (95% CI 1.5–78.7, P = 0.017)), independently predicted 12-month mortality. Conclusions Findings substantiate malnutrition as an independent predictor of 12-month mortality in a representative sample of hip fracture inpatients. Effective strategies to identify and treat malnutrition in hip fracture should be prioritized.

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Octachlorocyclotetraphosphazene, N4P4CIa, reacts with dibenzylamine to give the chloro(dibenzy1amino) derivatives, N4P,C18,[N(CH2Ph)2],,, n = 1, 2 (two isomers), and 4 (three isomers). Nongeminal structures have been assigned to these compounds on the basis of ‘H and jlP NMR spectra. The presence of at least two tris(dibenzylamin0) derivatives in some reaction mixtures is also inferred from NMR spectra. Steric effects become important at the tetrakis stage of chlorine replacement, and further substitution by dibenzylamine to give monocyclic tetrameric derivatives does not occur. A “bicyclic” phosphazene, N4P4[N(CH2Ph)2]6(NCHzPh)is, obtained from the reaction of N4P4Claw ith an excess of dibenzylamine in boiling methyl cyanide. The formation of this derivative and its spectroscopic data are discussed.

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Digital image

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Digital image

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Early detection of (pre-)signs of ulceration on a diabetic foot is valuable for clinical practice. Hyperspectral imaging is a promising technique for detection and classification of such (pre-)signs. However, the number of the spectral bands should be limited to avoid overfitting, which is critical for pixel classification with hyperspectral image data. The goal was to design a detector/classifier based on spectral imaging (SI) with a small number of optical bandpass filters. The performance and stability of the design were also investigated. The selection of the bandpass filters boils down to a feature selection problem. A dataset was built, containing reflectance spectra of 227 skin spots from 64 patients, measured with a spectrometer. Each skin spot was annotated manually by clinicians as "healthy" or a specific (pre-)sign of ulceration. Statistical analysis on the data set showed the number of required filters is between 3 and 7, depending on additional constraints on the filter set. The stability analysis revealed that shot noise was the most critical factor affecting the classification performance. It indicated that this impact could be avoided in future SI systems with a camera sensor whose saturation level is higher than 106, or by postimage processing.

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Autuus on katsojan silmässä: lukijakeskeinen tutkimus autuaaksijulistuksista Matt. 5 : 1-12 on reseptioanalyyttisellä metodilla tehty tutkimus siitä, miten akateeminen tutkimuskirjallisuus ja kymmenen valikoitua Jeesus-elokuvaa ovat ymmärtäneet autuaaksijulistusten merkityksen. Kartoitettuaan autuaaksijulistusten tulkintahistoriaa ja Jeesus-elokuvien kulttuurihistoriaa tutkielma kääntyy reseptiohistorialliseksi analyysiksi. Akateemisen tutkimuskirjallisuuden ja Jeesus-elokuvien esittämät tulkinnat Matteuksen evankeliumin autuaaksijulistuksista rinnas-tetaan suhteessa autuaaksijulistusten tyyliin, sisältöön, rakenteeseen ja merkitykseen. Autuaaksijulistusten tyylin tulkinnan analysointi tapahtuu vertailemalla millainen narratiivinen sijainti autuaaksijulistuksille on tarinassa annettu, millaiseksi elokuvat ja tutkimuskirjallisuus tulkitsevat julistusten esitykselliset puitteet sekä mitä näkemyksiä niillä on julistusten kohdeyleisöstä ja Jeesuksen esiintymistavasta. Autuaaksijulistusten sisällön analysointi tarkoittaa yksittäisten autuaaksijulistusten merkityksen selvittelyä. Tämä tapahtuu edelleen Jeesus-elokuvien ja tutkimuskirjallisuuden tekemiä tulkintoja vertailemalla. Näiden lisäksi tekijä esittää oman käännöksensä autuaaksijulistuksista eksegeettisen analyysin keinoin. Käännöksen tavoitteena ei kuitenkaan ole sanatarkkuus, vaan dynaamisuus lukijan tulkinnan säilyttämiseksi. Autuaaksijulistusten rakenteen analysointi esittelee muutamia erilaisia malleja, joiden mukaan tutkimuskirjallisuudessa Matteuksen evankeliumin autuaaksijulistuksia on ryhmitelty. Tässä alaluvussa elokuva-aineiston ja tutkimuskirjallisuuden erot ovat selkeimmin näkyvillä, sillä elokuvat pyrkivät ryhmittelyn sijasta luomaan autuaaksijulistuksille kokonaan uuden rakenteen, joka sopii elokuvakerrontaan julistuslistaa paremmin. Autuaaksijulistusten merkitystä analysoitaessa tutkielmassa asetetaan rinnan kolme Jeesus-elokuvaa, jotka edustavat tulkintahistoriasta tuttuja tulkinnallisia pääsuuntia: autuaaksijulistukset tulkitaan joko eettisiksi kehotuksiksi tai lupauksiksi armosta. Kolmas Jeesus-elokuva edustaa kontroversiaalista näkemystä, joka kiistää molemmat edellä mainitut tulkintatavat. Johtopäätöksissä osoitetaan reseptiohistorialliseen analyysiin viitaten, että tulkintojen muotoutuminen ei ole yksinkertaista. Tulkintaan vaikuttavat paitsi tulkitsijan ennakkokäsitykset, myös tulkittava teksti ja tulkintatilanne. Johtopäätöksissä puolustetaan myös populaarikulttuurin teologisten elementtien tutkimusta osana eksegetiikkaa.

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The viscosities of ternary mixtures of R-12, R-22, and R-114 vapors were determined at ambient temperature and pressure within +-1% by using an oscillating disk viscometer. The empirical viscosity obtained by Wllke's equation compares very well with the experimental results obtained with this vlscometer. In the case of this ternary vapor mixture, as long as the molar fraction ratio of R-12 to R-114 Is maintained at approximately 2"' (=Inverse ratio of thelr molecular weights) the viscosity of the ternary mixture at ambient temperature and pressure remalns constant irrespective of the percentage of R-22 present in the mixture.

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We present experimental validation of a new reconstruction method for off-axis digital holographic microscopy (DHM). This method effectively suppresses the object autocorrelation,namely, the zero-order term,from holographic data,thereby improving the reconstruction bandwidth of complex wavefronts. The algorithm is based on nonlinear filtering and can be applied to standard DHM setups with realistic recording conditions.We study the robustness of the technique under different experimental configurations,and quantitatively demonstrate its enhancement capabilities on phase signals.

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This commentary was stimulated by Yeping Li's first editorial (2014) citing one of the journal's goals as adding multidisciplinary perspectives to current studies of single disciplines comprising the focus of other journals. In this commentary I argue for a greater focus on STEM integration, with a more equitable representation of the four disciplines in studies purporting to advance STEM learning. The STEM acronym is often used in reference to just one of the disciplines, commonly science. Although the integration of STEM disciplines is increasingly advocated in the literature, studies that address multiple disciplines appear scant with mixed findings and inadequate directions for STEM advancement. Perspectives on how discipline integration can be achieved are varied, with reference to multidisciplinary, interdisciplinary, and transdisciplinary approaches adding to the debates. Such approaches include core concepts and skills being taught separately in each discipline but housed within a common theme; the introduction of closely linked concepts and skills from two or more disciplines with the aim of deepening understanding and skills; and the adoption of a transdisciplinary approach, where knowledge and skills from two or more disciplines are applied to real-world problems and projects with the aim of shaping the total learning experience. Research that targets STEM integration is an embryonic field with respect to advancing curriculum development and various student outcomes. For example, we still need more studies on how student learning outcomes arise not only from different forms of STEM integration but also from the particular disciplines that are being integrated. As noted in this commentary, it seems that mathematics learning benefits less than the other disciplines in programs claiming to focus on STEM integration. Factors contributing to this finding warrant more scrutiny. Likewise, learning outcomes for engineering within K-12 integrated STEM programs appear under-researched. This commentary advocates a greater focus on these two disciplines within integrated STEM education research. Drawing on recommendations from the literature, suggestions are offered for addressing the challenges of integrating multiple disciplines faced by the STEM community.

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The Mueller-Stokes formalism that governs conventional polarization optics is formulated for plane waves, and thus the only qualification one could require of a 4 x 4 real matrix M in order that it qualify to be the Mueller matrix of some physical system would be that M map Omega((pol)), the positive solid light cone of Stokes vectors, into itself. In view of growing current interest in the characterization of partially coherent partially polarized electromagnetic beams, there is a need to extend this formalism to such beams wherein the polarization and spatial dependence are generically inseparably intertwined. This inseparability brings in additional constraints that a pre-Mueller matrix M mapping Omega((pol)) into itself needs to meet in order to be an acceptable physical Mueller matrix. These additional constraints are motivated and fully characterized. (C) 2010 Optical Society of America

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The issue raised in this Letter is classical, not only in the sense of being nonquantum, but also in the sense of being quite ancient: which subset of 4 X 4 real matrices should be accepted as physical Mueller matrices in polarization optics? Nonquantum entanglement or inseparability between the polarization and spatial degrees of freedom of an electromagnetic beam whose polarization is not homogeneous is shown to provide the physical basis to resolve this issue in a definitive manner.