bluuebunny/crossref_metadata_2025_split huggingface dataset:
X‐ray diffraction and Raman study of nanogranular BaTiO3–CoFe2O4thin films deposited by laser ablation on Si/Pt substrates
Authors: Barbosa J. , Almeida B. , Mendes J. A. , Rolo A. G. , Araújo J. P. 
Published: May 2007

AbstractNanocomposite thin films composed by (BaTiO3)1–x–(CoFe2O4)xwith different cobalt ferrite concentrations (x) have been deposited by pulsed laser ablation on platinum covered Si(001) substrates. The films structure was studied by X‐ray diffraction and Raman spectroscopy. It was found that the CoFe2O4phase unit cell was compressed along the growth direction of the films, and it relaxed with increasingx. The opposite behavior was observed in the BaTiO3phase where the lattice parameters obtained from the X‐ray measurements presented a progressive distortion of its unit cell with increasingx. The presence of the strain in the films induced a blueshift of the Raman peaks of CoFe2O4that decreased with increasing CoFe2O4concentration. Cation disorder in the cobalt ferrite was observed for lowerx, where the nanograins are more isolated and subjected to more strain, which was progressively decreased for higher CoFe2O4content in the films. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Nanostructured porous silicon as thick electrical insulator for radio‐frequency applications
Authors: Porcher A. , Remaki B. , Populaire C. , Barbier D. 
Published: May 2007

AbstractNanostructured porous silicon layers are studied for the purpose of their use as electrical insulators between mono‐crystalline silicon substrates and integrated planar radio frequency (rf) devices. The capacitive nature of the layers with a tangent loss lower than 10–2 is demonstrated in the 105–109 Hz range by means of complex impedance measurements and rf regime experiments on micro L –C resonant circuits. Finally, the insulating capabilities of nanostructured porous silicon were evaluated using numerical simulations combined with our experimental data. A minor contribution of the porous silicon residual conductance to the rf energy loss is found. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Optical properties of Ho3+–Yb3+ co‐doped nanostructured SiO2–LaF3 glass‐ceramics prepared by sol–gel method
Authors: Velázquez J. J. , Yanes A. C. , Castillo J. del , Méndez‐Ramos J. , Rodríguez V. D. 
Published: May 2007

AbstractTransparent glass‐ceramics with composition of 95SiO2–5LaF3 doped with 0.1 mol% of Ho3+ or co‐doped with 0.1 mol% of Ho3+ and 0.3 mol% of Yb3+ were synthesized by thermal treatment of precursor sol–gel glasses. Segregation of LaF3 nanocrystals in the matrix was confirmed from a structural analysis by means of X‐ray diffraction. Blue, green and red efficient up‐conversion emissions were observed under 980 nm excitation at room temperature. These results could be attributed to the partition of a fraction of Ho3+ ions into the precipitated LaF3 nanocrystals. Moreover, near infrared down‐conversion at 1.2 μm is also observed. The mechanisms involved in the up‐conversion emissions could be ascribed to a two‐ and three‐ photon process. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Mechanical properties of crystalline calcium‐silicate‐hydrates: comparison with cementitious C‐S‐H gels
Authors: Manzano H. , Dolado J. S. , Guerrero A. , Ayuela A. 
Published: May 2007

AbstractThis work explores from a theoretical viewpoint the mechanical properties of the most important hydration product present in cementitious environments, the so called C‐S‐H (calcium‐silicate‐hydrate) gel. The dependence of the bulk (K), shear (G) and Young's (E) modulus for the C‐S‐H crystals respect to its composition and the length of its silicate chains is analysed by lattice dynamic simulations with parameterised two‐body and three‐body potentials. Our simulations reveal that the mechanical properties of C‐S‐H crystals show a strong dependence on their composition. Nevertheless our calculated numbers systematically overestimate the experimental values for C‐S‐H gels. Only when the finite length of the silicate chains is taken into account this discrepancy disappears. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A System Dynamics Simulation Model for Analyzing the Stability of Software Release Plans
Authors: Pfahl Dietmar , Al‐Emran Ahmed , Ruhe Günther 
Published: May 2007

AbstractRelease planning for incremental software development assigns features to releases such that most important technical, resource, risk and budget constraints are met. The research presented in this paper is an element of a three‐staged procedure. In addition to an existing method for (i) strategic release planning that maps requirements to subsequent releases and (ii) a more fine‐grained planning that defines resource allocations for each individual release, we propose a third step, i.e. (iii) stability analysis, which analyzes fine‐grained plans of individual releases with regard to their sensitivity to planning errors. Planning errors can relate to alterations in expected personnel availability and productivity, feature and task‐specific work volume, and degree of task dependency. The focus of this article is on stability analysis of proposed release plans. We present the simulation model Release Plan Simulator, Version 1 (REPSIM‐1) and illustrate its usefulness for stability analyses with the help of a case example. Copyright © 2007 John Wiley & Sons, Ltd.
Bemerkung zu einem Satze von Hurwitz
Authors: Bilharz Herbert 
Published: May 2007

AbstractAls Erweiterung eines Satzes von A. Hurwitz wird im Anschluß an I. Schur ein Determinantenkriterium angegeben, welches notwendig und hinreichend dafür ist, daß sämtliche Wurzeln einer algebraischen Gleichung mit komplexen Koeffizienten nur negative Realteile besitzen. Zur numerischen Berechnung der einzelnen Determinanten wird ein einfaches Schema mitgeteilt.
Beiträge zur Dynamik des kräftefreien, kardanisch gelagerten Kreisels
Authors: Magnus K. 
Published: May 2007

AbstractDie Trägheitsmomente der Aufhängung beeinflussen die Nutationsbewegungen kardanisch gelagerter Kreisel. Bei symmetrischen Kreiselrotor führen sie — wie bereits bekannt — auch bei vollkommen reibungsloser Lagerung zu einer Auswanderung der mittleren Achsrichtung unter dem Einfluß der Nutationsbewegungen; bei unsymmetrischen Kreisel beeinflussen sie die Stabilitätsbedingungen. Beide Effekte werden in der vorliegenden Arbeit in Abhängigkeit von der Schrägstellung des inneren Kardanringes untersucht.
Mittlere Approximation mit linear unabhängigen Funktionen
Authors: Kaluza Theodor 
Published: May 2007

AbstractEine willkürliche Funktion (wF) soll durch ein Polynom (P) aus n linear unabhängigen Funktionen (F) im Mittel möglichst gut approximiert werden. Unter gewissen Integrationsvoraussetzungen gibt es genau eine Lösung. Die Fehlerformel verallgemeinert die Besselsche Ungleichung. Die Elemente gewisser Matrizen (EM) sind maßgebend für die Gewinnung der Koeffizienten von P (K P). für die Bildung und Normierung eines Orthogonalsystems (OS), für eine Integraldarstellung der KP, für die Darstellung der F durch das OS, für die änderung der KP und des Fehlers bei wachsendem n und für den Zusammenhang mit einer evtl. gleichmäßigen Entwicklung der wF nach den F. Die EM genügen einer Rekursionsformel.
Remarks on the Centre of Shear
Authors: Pearson Carl E. 
Published: May 2007

AbstractDie beiden gebräuchlichen Methoden zur Berechnung der Lage des Schubmittelpunktes geben verschiedene Resultate. Zweck der vorliegenden Arbeit ist, die Ursache dieser Diskrepanz zu untersuchen und Schranken für die Größe des Unterschiedes anzugeben.
Die axiale Strömung von Bingham Plastiken in konzentrischen Rohren
Authors: Slibar A. , Paslay P. R. 
Published: May 2007

AbstractUnter Benutzung dreidimensionaler Spannungs‐Verformungsgeschwindigkeitsbeziehungen wird für einen als Bingham Plastik bezeichneten Stoff das Strömungs‐ und Spannungsfeld bestimmt. Die Rechnung zeigt, daß ein konzentrischer Teil des Materials sich zwischen zylindrischen Grenzflächen mit gleichförmiger Geschwindigkeit bewegt. Die Ergebnisse einer numerischen Auswertung der erhaltenen Lösung werden für einige im Tiefbohrwesen auftretende Fälle zeichnerisch dargestellt.
Polortkurven als Hilfsmittel zur Konstruktion von Gelenkgetrieben
Authors: Lohse Paul 
Published: May 2007

AbstractEs werden mit Hilfe von „Lagenscharen”︁ eines Getriebegliedes geometrische Örter der Pole als „Polort kurven”︁ eingeführt und eine erweiterte Grundaufgabe der Maßsynthese formuliert. Einige Beispiele zeigen Anwendungsmöglichkeiten.
The Stresses in an Elliptic Ring Under Concentrated Loading
Authors: Seika M. 
Published: May 2007

AbstractEs wird in der vorliegenden Arbeit der am Außenrand durch zwei Druckkräfte belastete Ellipsenring auf Grund der komplexen Lösungsmethode von Muskhelishvili behandelt. Numerische Ergebnisse werden mitgeteilt.
Vibrations of a beam on elastic foundation
Authors: Mathews P. M. 
Published: May 2007

AbstractDas Schwingungsproblem eine auf elastischer Grundlage liegenden Balkens wird analysiert für den Fall, daß der Balken gleichförmig und von unendlicher Länge ist und daß eine alternierende Last an einem Punkt angreift, der sich mit konstanter Geschwindigkeit entlang des Balkens verschiebt. Die Nautur der ungedämpften Schwingungen wird eingehend untersucht, wobei die das System charakterisierenden kritischen Parameter definiert werden. Die Anwendung der Theorie auf Probleme, die die Deformation von Eisenbahnschienen betreffen, wird kurz angedeutet.
Die zweidimensionale Fourieranalyse spezieller Koppelkurven
Authors: Meyer W. 
Published: May 2007

AbstractWährend bereits die Harmonische Analyse der Bewegungsgleichungen von Getriebegliedern wertvolle Ergebnisse für die Beurteilung der Gelenkgetriebe, vor allem in Hinblick auf die Dynamik, gebracht hat, wird jetzt auch die Analyse der Bewegungskomponenten von Koppelkurven durchgeführt, die u. a. für die Untersuchung von Schwerpunktsbahnen wichtig ist. Diese Analyse bedeutet im wesentlichen die Aufstellung der Fourier‐Reihen für den cosinus und den sinus des Koppelwinkels. Die Koeffizienten folgen aus der Form und den Abmessungen des Getriebes und stehen in bestimmter Beziehung zueinander. Einige Sonderfälle führen zu besonders einfachen Ergebnissen.
Über die Stabilität numerischer Methoden zur Integration gewöhnlicher Differentialgleichungen erster Ordnung
Authors: Quade W. 
Published: May 2007

AbstractNach Untersuchung einiger der gebräuchlichen Verfahren zur numerischen Integration von gewöhnlichen Differentialgleichungen erster Ordnung auf Stabilität wird eine Integrationsmethode entwickelt, durch die instabile Verfahren stabil gemacht werden können.
The effect of square and triangular notches with fillets on the transverse flexure of semi‐infinite plates
Authors: Shioya S. 
Published: May 2007

AbstractThe problem of estimating the effect of a square or triangular notch on the stresses in a semi‐infinite thin plate subjected to bending moment is treated on the basis of Kirchhoff's theory of bending and by using the method of complex representation due to Muskhelishvili. The perturbation method is used to determine the coefficients contained in the bending function of the plate. For some special cases numerical results are given.
Einfache Fehlerschranken beim Eigenwertproblem symmetrischer Matrizen
Authors: Nitsche Joachim A. 
Published: May 2007

AbstractDas orthonormierte System von Vektoren {𝔶i} approximiere die Eigenvektoren 𝔯i einer reellen symmetrischen Matrix 𝔄. Es werden Abschätzungen für die Genauigkeit von 𝔶i und von daraus abgeleiteten Näherungen für die Eigenwerte angegeben. Die Schranken sind von einfacher Bauart, zur Berechnung sind im wesentlichen nur Matrix‐Vektor‐Multiplikationen erforderlich.
A novel starch for the treatment of glycogen storage diseases
Authors: Bhattacharya K. , Orton R. C. , Qi X. , Mundy H. , Morley D. W. , Champion M. P. , Eaton S. , Tester R. F. , Lee P. J. 
Published: May 2007

SummaryObjective:To determine whether a new starch offers better short‐term metabolic control than uncooked cornstarch in patients with glycogen storage diseases (GSDs).Study design:A short‐term double‐blind cross‐over pilot study comparing uncooked physically modified cornstarch (WMHM20) with uncooked cornstarch in patients with GSD types Ia, Ib and III. Twenty‐one patients (ages 3–47, 9 female) were given 2 g/kg cornstarch or WMHM20 mixed in water. Blood glucose, lactate and insulin, and breath hydrogen and 13CO2 enrichment were measured, at baseline and after each load. The hourly biochemical evaluations terminated when blood glucose was ≤3.0 mmol/L, when the study period had lasted 10 h or when the patient wished to end the test. The alternative starch was administered under similar trial conditions a median of 10 days later.Results:The median starch load duration was 9 h for WMHM20 versus 7 h for cornstarch. Glucose decreased more slowly (p=0.05) and lactate was suppressed faster (p=0.17) for WMHM20 compared with cornstarch. Peak hydrogen excretion was increased (p=0.05) when cornstarch was taken.Conclusion:These data indicate longer duration of euglycaemia and better short‐term metabolic control in the majority of GSD patients with WMHM20 compared to cornstarch.
Generation and survival of midbrain dopaminergic neurons in weaver mice
Authors: Martí Joaquín , Santa‐Cruz M.C. , Bayer Shirley A. , Ghetti Bernardino , Hervás José P. 
Published: May 2007

AbstractGeneration and survival of midbrain dopaminergic (DA) neurons were investigated using tyrosine hydroxylase (TH) immunocytochemistry combined with tritiated thymidine autoradiography at appropriate anatomical levels throughout the anteroposterior (A/P) axes of the substantia nigra pars compacta (SNc) and the ventral tegmental area (VTA). The wild‐type (+/+) and homozygous weaver (wv/wv) mice used here were the offspring of pregnant dams injected with the radioactive precursor when the mesencephalic neurons were being produced (gestational days 11–15). Data reveal that, at postnatal day 90, depletion of TH‐stained cells in the wv/wv presented an A/P pattern of increasing severity and, therefore, the DA cells located in posterior parts of the SNc or the VTA appear to be more vulnerable than the settled anterior neurons. When the time of neuron origin is inferred for each level of these cell groups, it is found that the neurogenesis span is similar for both experimental groups, although significant deficits in the frequency of wv/wv late‐generated neurons were observed in any level considered. On the other hand, it has been found that TH‐positive neurons were settled along the extent of the SNc and the VTA following precise and differential neurogenetic gradients. Thus, the acute rostrocaudal increase in the proportion of late‐generated neurons detected in both +/+ DA‐cell groups is disturbed in the weaver homozygotes due to the indicated A/P depletion.
More advice for nurses returning to school
Authors: Brimmer Elaine A 
Published: May 2007

Nurses returning to school after an absence from the academic world have special problems. They usually have a job, family, and civic responsibilities to consider.Four operating room nurses responded to the following questions:

As a recent student, what advice would you give a nurse returning to school? What should the new nurse‐student be prepared for? Are there ways he or she can make reentry into education easier? Once in the system, what can the new student do to “survive”?
Epidemic infections in surgical patients
Authors: Garner Julia S , Dixon Richard E , Aber Robert C 
Published: May 2007

From 1967 to 1977, the Centers for Disease Control investigated 22 epidemics of nosocomial infections among surgical patients. Fifteen of the outbreaks involved operative site infections and were caused by various microorganisms: gram‐positive bacteria (47%), gram‐negative bacteria (13%), atypical mycobacteria (13%), Aspergillus (7%), and multiple microorganisms (20%).Sources for infecting strains were infected personnel or patients (53%), the operating room environment (20%), and four unknown factors (27%). Control measures included treatment of personnel who were carriers and infected patients, adherence to aseptic techniques, improvements in OR airflow and cleaning procedures, and discontinuation of elective surgery during OR construction.The other seven epidemics were associated with perioperative care and caused by gram‐negative bacteria. There were six epidemics of primary bacteremia, four of them associated with arterial pressure transducers. Another bacteremia epidemic was caused by the infusion of contaminated commercially prepared normal serum albumin. The remaining primary bacteremia epidemic was caused by using syringes contaminated by ice to obtain blood samples for blood gas determinations. One epidemic of Salmonella gastroenteritis and secondary bacteremia was traced to a contaminated intermittent‐suction machine used for postoperative care.Control measures for these epidemics included judicious use and proper decontamination and sterilization of the transducers, recall of the contaminated product, aseptic procedures for caring for arterial cannulae, and proper decontamination of suction equipment.Suggestions for the evaluation and control of potential epidemics are based on the results of these investigations.
Anesthetic Gas Exposure: Protecting The Or Environment
Authors: Brown Donald G. , Wetterstroem Nanette , Finch Jay 
Published: May 2007

A trace gas study was conducted at The University of Michigan Hospitals to assess levels of anesthetic gas in the OR environement. Samples were collected at various sites associated with anesthesia equipment in 18 operating rooms and three treatment rooms where general anesthesia was used routinely. Waste anesthetic gas levels were found to vary widely and, depending upon anesthesiologists' work practices and equipment design, significant personnel exposures were documented. Although standard turbulent air flow, nonrecirculating systems are used in most ORs, areas of high gas concentration were identified. Such locations included the area between the gas machine and adjacent wall, and along the perimeter of the patient drapes. Gas concentrations were influenced by such variables as the distance from the anesthesia equipment to the exhaust grilles, and personnel movement.Anesthetizing techniques and work practices are the major contributors to waste anesthesia levels in the OR environement.
Intraoperative Molar Pregnancy Crisis
Authors: ROBINSON BARBARA J. HEMSLEY 
Published: May 2007

ABSTRRACTMolar pregnancy is a gestation in which the ovum is transformed into a fleshy tumor mass or mole. Of all gynecologic tumors, it is one of the most feared. It is characterized by first trimester bleeding, hyperemesis, and toxemia and can be diagnosed using pelvic ultrasound. Suction curettage is the treatment of choice for molar pregnancy when a patient desires to have more children; however, hysterectomy may be necessary. Abdominal hysterectomy reduces the risk of malignant sequelae. Complications associated with molar pregnancy usually are a result of suction curettage and include pulmonary insufficiency syndrome, choriocarcinoma, hyperthyroidism, theca lutein cysts, and disseminated intravascular coagulation. The perioperative nurse can be instrumental in assessing, planning, organizing, and directing intervention for potential complications associated with the management of a molar pregnancy crisis. The perioperative nurse is encouraged to review all aspects of molar pregnancy to understand the ramifications of the surgical procedures. AORN J 60 (August 1994) 193–201.
Perioperative Care of the Pregnant Surgical Patient
Authors: KENDRICK JO M. , POWERS PALLAS HAMMOND 
Published: May 2007

AbstractSuccessful perioperative management of the pregnant surgical patient requires a multidisciplinary nursing approach to decrease perinatal morbidity and mortality. A comprehensive perioperative patient care plan and coordination with obstetric and neonatal team members enhance the surgical outcome for both the mother and her child. AORN J 60 (August 1994) 205–216.
Psychosocial Needs of Women During Miscarriage or Ectopic Pregnancy
Authors: WHEELER SARA RICH 
Published: May 2007

AbstractThe woman who experiences a miscarriage or ectopic pregnancy may express her grief with many different responses. Perioperative nurses can enable the woman and her family members to adequately grieve the loss of pregnancy and the baby by using sensitive communication, theapeutic listening, and empathy skills and by coordinating follow up. AORN J 60 (August 1994) 221–231.
Perioperative Care of the Pediatric Trauma Patient
Authors: Davis Janice L. , Klein Ruth Weinstein 
Published: May 2007

ABSTRACTChildren have specific emotional and physiological needs that are intensified when they sustain injuries that require surgery. Care of pediatric trauma patients includes the physiological considerations of airway management, hemodynamic stability, hypothermia, and physical size. Psychological considerations include enhancing coping skills, caring for children according to their developmental levels, and caring for family members. The perioperative nurse must be familiar with these pediatric trauma nursing principles to effectively meet the needs of children and their family members during times of trauma crisis. AORN J 60 (Oct 1994) 561–570.
Celebrating 40 Years of Progress in Perioperative Nursing Techniques
Authors: Dunscombe Althea , Riall Charles T. 
Published: May 2007

ABSTRACTPerioperative nurses have seen innumerable changes in their practices. During the past 40 years, new surgical and nursing techniques, new technology, and increased knowledge have resulted in improved care of the surgical patient. Much can be learned by reviewing the progress made by perioperative nurses during the past four decades. AORN J 60 (Nov 1994) 742–752.
Latex Sensitivity Among Perioperative Nurses
Authors: Zaza Stephanie , Reeder Jean M. , Charles Luenda E. , Jarvis William R. 
Published: May 2007

ABSTRACTTo estimate the prevalence, risk factors, and clinical spectrum of adverse reactions to natural rubber latex‐containing products among a national sample of perioperative nurses, the investigators administered a self‐reporting questionnaire to a convenience sample of 2,200 members of the Association of Operating Room Nurses, Inc. Of the 1,738 nurses who responded, 369 (21 %) reported latex reactions. Multivariate analysis identified a history of allergies to cosmetic powders, other allergies, chronic illnesses, and regular use of latex gloves as independent risk factors for reactions to latex‐containing products. localized reactions, such as contact dermatitis, were the reactions reported most commonly, although severe systemic reactions also were described. AORN J 60 (Nov 1994) 806–81 2.
Evolution of the 12 kDa FK506‐binding protein gene
Authors: Somarelli Jason A. , Herrera Rene J. 
Published: May 2007

Background information. The FKBPs (FK506‐binding proteins) belong to a ubiquitous family of proteins that are found in a wide range of taxonomic groups. These proteins participate in a variety of pathways, including protein folding, down‐regulation of T‐cell activation and inhibition of cell‐cycle progression.Results. A cDNA encoding the 12 kDa FKBP gene orthologue (FKBP12) in Bombyx mori was been isolated from both Bm‐5 cultured cells and silk‐gland tissue. Using the FKBP12 cDNA in combination with the B. mori 6× whole‐genome shotgun database, we were able to identify the FKBP12 gene, as well as the positions of its intron—exon junctions.Conclusions. FKBP12 exon sizes and intronic positions are highly conserved among FKBP12 orthologues in 24 diverse genomes. Comparison of 41 FKBP12 genes revealed several intronic insertion and deletion events throughout evolution. In addition, paralogous FKBP12 isoforms were identified in all 12 vertebrate genomes. Both structural and phylogenetics analyses suggest that the isoforms may be evolving independently, possibly due to the distinct functional roles played by each paralogue.