bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modellkorrekturfaktoren als “Performance Indikatoren” für die Langzeitbewertung der integralen Marktwasserbrücke S33.24
Authors: Strauss Alfred , Wendner Roman , Bergmeister Konrad , Reiterer Michael , Horvatits Johann 
Published: April 2011

AbstractMonitoring hat für den Entwurf und die Beurteilung sowohl neuer als auch bestehender Ingenieurtragwerke eine enorme Wichtigkeit. Die praktische Erfahrung und Beobachtungen zeigen, dass Monitoring die Grundlage für neue normative Grundlagen oder effiziente Erhaltungsprogramme liefern kann. Darüber hinaus können Monitoringsysteme erhebliche Instandsetzungskosten und Unannehmlichkeiten infolge von Störungen vermeiden. Dies begründet den erheblichen Forschungsaufwand, um eine effektive Implementierung der aufgenommenen Monitoringdaten in ein numerisches oder analytisches Strukturmodell zu erreichen, welches die Ermittlung eines vom erwarteten Verhalten abweichenden Strukturverhaltens und die Entdeckung eines beginnenden Verschlechterungsprozesses erlaubt.Dieser Aufsatz behandelt ein Konzept für eine effektive Einbindung einer Monitoringinformation in ein numerisches Modell auf Basis des Konzeptes der Modellkorrekturfaktoren. Insbesondere entstand diese Studie aus den Fragestellungen im Zuge des Forschungsprojektes “Monitoringbasierte Analyse von Integralen Brücken (MAIB)”. Das Forschungsvorhaben MAIB verfolgt Fragestellungen, welche das Tragwerk, die Interaktion zwischen Tragwerk und Bodenkörper, die Stabilität des Bodenkörpers hinter dem Widerlager und den Übergangsbereich zwischen dem Tragwerk und dem Boden im Fahrbahnbereich betreffen.Monitoring and Influence Lines Based Performance IndicatorsMonitoring is of most practical significance for the design and assessment of new as well as of existing engineering structures. Practical experience and observations show that monitoring can provide the basis for new code specifications or efficient maintenance programs. Moreover, monitoring systems can avoid considerable costs of repairs and inconvenience to the public due to interruptions. This gives rise to the need for a thorough investigation to achieve an effective implementation of recorded monitoring data in numerical or analytical structural models that allow the detection of a deviant behavior from the proposed and the detection of initial deterioration processes. This study attempts to derive a concept for the effective incorporation of monitoring information in numerical models based on the concept of model correction factors. In particular, these studies are performed on the abutment free bridge structure S33.24 that has been proof loaded in February 2010 and monitored since December 2008. A merit of models derived based on monitoring data is that they are directly related to performance indicators which can be used for the assessment of the existing structural capacity and for an efficient life cycle analysis.
Bauwerkscanner zur automatisierten und kombinierten Anwendung zerstörungsfreier Prüfverfahren im Bauwesen
Authors: Taffe Alexander , Kind Thomas , Stoppel Markus , Kurz Jochen H. 
Published: April 2011

AbstractBereits seit vielen Jahren stehen Anwendern der zerstörungsfreien Prüfung im Bauwesen (ZfPBau) zuverlässige Geräte zur Untersuchung von Betonbauteilen zur Verfügung. Viele dieser Geräte zeichnen eine Messgröße in Bezug zum Messort auf und sind je nach Ausstattung in der Lage, die Ergebnisse in einem Koordinatensystem darzustellen. Doch erst die Kombination verschiedener ZfPBau‐Verfahren an einer Messfläche erlaubt den maximalen Informationsgewinn über die innere Konstruktion von Stahlbeton‐ und Spannbetonbauteilen. In dem Beitrag wird ein Bauwerkscanner zur automatisierten und kombinierten Datenaufnahme beschrieben, der erstmals die Kombination von Radar, Ultraschall und Wirbelstrom mit Datenausgabe in einem einheitlichen Koordinatensystem ermöglicht. Dieser Scanner ist im Gegensatz zu früheren Systemen technikerbasiert und erlaubt im Bedarfsfall eine spätere detaillierte Auswertung durch ZfP‐Spezialisten. Die Ergebnisse werden bildgebend in frei wählbaren Schnitten dargestellt, was bereits kurze Zeit nach der Messung auf der Baustelle möglich ist. Am Beispiel eines Brückenträgers wird gezeigt, wie der tatsächliche Spanngliedverlauf aus Messdaten ermittelt wird und dem angenommenen Verlauf gemäß Bestandsplan gegenübergestellt wird. Damit kann künftig eine Überprüfung von Bestandsplänen durchgeführt werden. Darüber hinaus könnten nicht vorhandene Bestandspläne rekonstruiert werden. Des Weiteren wird am gleichen Brückenträger gezeigt, wie sich ein echter Verpressfehler und im Unterschied dazu ein Luftspalt in einem Hüllrohr in Messdaten abbilden. An dem Beispiel wird deutlich, wie Ultraschallergebnisse in Kombination mit Phasenauswertung zur Formulierung von Verdachtsstellen für Verpressfehler eingesetzt werden können und welche Maßnahmen zur Verifizierung getroffen werden müssen.
Bemessungs‐ und Ausführungshinweise für Aufbeton auf Brückenfahrbahnplatten
Authors: Hartl Helmut , Feix Jürgen 
Published: April 2011

AbstractDurch die ständige Erhöhung der Verkehrsbelastungen in den letzten Jahrzehnten und durch die Verwendung moderner Fahrzeugrückhaltesysteme sind ältere Brücken häufig nicht mehr in der Lage, ohne Verstärkungsmaßnahmen den Anforderungen des modernen Straßenverkehrs zu genügen. Eine bewährte Methode, die Tragfähigkeit einer Brücke zu erhöhen, besteht darin, auf das entsprechend vorbehandelte Rohtragwerk eine bewehrte Platte, welche mit dem Bestand kraftschlüssig verbunden ist, zu betonieren. Für die Bemessung sind der Eurocode und die in den europäisch technischen Dübelzulassungen (ETA) angegeben Bemessungsvorschriften (ETAG, TR, ...) anzuwenden. Der Anwender steht vor einer Fülle von breit gefächerten Wahlmöglichkeiten innerhalb dieser Vorschriften. Auf Basis der Erkenntnisse von mehreren Versuchsprogrammen gibt in Österreich die RVS 15.02.34 Anweisungen für die Fugenvorbereitung, die Rezeptur und den Einbau des Aufbetons und für die zugehörige Interpretation des Eurocodes und der Dübelbemessungsvorschriften bei der Bemessung der Schubfuge.Design and Detailling of Concrete OverlaysDue to a permanent increase of traffic loads during the last decades and due to installation of modern vehicle restraint systems older bridges are often overloaded and thus have to be strengthened. Casting a concrete overlay on the existing structure is a state of the art method in order to increase the bearing capacity. The key is to prepare the interface in a way that no slip will occur between old and new concrete when forces are transferred over the interface. Mandatory for designing the concrete overlay is the Eurocode and in the European Technical Approvals (ETA) for dowels referred design guidelines (ETAG, TR, ...). However, the designer has to choose within a lot of options. On the basis of several research programs the RVS 15.02.34 gives recommendations for the preparation of the old concrete, the composition of the new concrete, casting and curing as well as choosing the associated options of the Eurocode within the structural design and detailing of the interface.
X‐ray solution scattering studies of the structural diversity intrinsic to protein ensembles
Authors: Makowski Lee , Gore David , Mandava Suneeta , Minh David , Park Sanghyun , Rodi Diane J. , Fischetti Robert F. 
Published: April 2011

AbstractIt is becoming increasingly clear that characterization of the protein ensemble—the collection of all conformations of which the protein is capable—will be a critical step in developing a full understanding of the linkage between structure, dynamics, and function. X‐ray solution scattering in the small angle (SAXS) and wide‐angle (WAXS) regimes represents an important new window to exploring the behavior of ensembles. The characteristics of the ensemble express themselves in X‐ray solution scattering data in predictable ways. Here we present an overview of the effect that structural diversity intrinsic to protein ensembles has on scattering data. We then demonstrate the observation of these effects in scattering from four molecular systems; myoglobin; ubiquitin; alcohol dehydrogenase; and HIV protease; and demonstrate the modulation of these ensembles by ligand binding, mutation, and environmental factors. The observations are analyzed quantitatively in terms of the average spatial extent of structural fluctuations occurring within these proteins under different experimental conditions. The insights which these analyses support are discussed in terms of the function of the various proteins. © 2011 Wiley Periodicals, Inc. Biopolymers 95: 531–542, 2011.
Polyhydroxybutyrate production from lactate using a mixed microbial culture
Authors: Jiang Yang , Marang Leonie , Kleerebezem Robbert , Muyzer Gerard , van Loosdrecht Mark C.M. 
Published: March 2011

AbstractIn this study we investigated the use of lactate and a lactate/acetate mixture for enrichment of poly‐3‐hydroxybutyrate (PHB) producing mixed cultures. The mixed cultures were enriched in sequencing batch reactors (SBR) that established a feast–famine regime. The SBRs were operated under conditions that were previously shown to enable enrichment of a superior PHB producing strain on acetate (i.e., 12 h cycle length, 1 day SRT and 30°C). Two new mixed cultures were eventually enriched from activated sludge. The mixed culture enriched on lactate was dominated by a novel gammaproteobacterium. This enrichment can accumulate over 90 wt% PHB within 6 h, which is currently the best result reported for a bacterial culture in terms of the final PHB content and the biomass specific PHB production rate. The second mixed culture enriched on a mixture of acetate and lactate can produce up to 84 wt% PHB in just over 8 h. The predominant bacterial species in this culture were Plasticicumulans acidivorans and Thauera selenatis, which have both been reported to accumulate large amounts of PHB. The data suggest that P. acidivorans is a specialist on acetate conversion, whereas Thauera sp. is a specialist on lactate conversion. The main conclusion of this work is that the use of different substrates has a direct impact on microbial composition, but has no significant effect on the functionality of PHB production process. Biotechnol. Bioeng. 2011;108:2022–2035. © 2011 Wiley Periodicals, Inc.
Bioartificial liver system based on choanoid fluidized bed bioreactor improve the survival time of fulminant hepatic failure pigs
Authors: Lv Guoliang , Zhao Lifu , Zhang Anye , Du Weibo , Chen Yu , Yu Chengbo , Pan Xiaoping , Zhang Yimin , Song Tao , Xu Jiansheng , Chen Yu , Li Lanjuan 
Published: March 2011

AbstractBioartificial liver (BAL) support system has been proposed as potential treatment method for end‐stage liver diseases. We described an improved BAL system based on a choanoid fluidized bed bioreactor containing alginate–chitosan encapsulated primary porcine hepatocytes. The feasibility, safety, and efficiency of this device were estimated using an allogeneic fulminant hepatic failure (FHF) model. FHF was induced with intravenous administration of D‐galactosamine. Thirty FHF pigs were divided into three groups: (1) an FHF group which was only given intensive care; (2) a sham BAL group which was treated with the BAL system with empty encapsulation, and (3) a BAL group which was treated with the BAL system containing encapsulated freshly isolated primary porcine hepatocytes. The survival times and biochemical parameters of these animals were measured, and properties of the encapsulations and hepatocytes before and after perfusion were also evaluated. Compared to the two control groups, the BAL‐treated group had prolonged the survival time and decreased the blood lactate levels, blood glucose, and amino acids remained stable. No obvious ruptured beads or statistical decline in viability or function of encapsulated hepatocytes were observed. This new fluidized bed BAL system is safe and efficient. It may represent a feasible alternative in the treatment of liver failure. Biotechnol. Bioeng. 2011;108:2229–2236. © 2011 Wiley Periodicals, Inc.
Randomized controlled trial of fibrin sealant to reduce postoperative drainage following elective lymph node dissection
Authors: Swan M C , Oliver D W , Cassell O C S , Coleman D J , Williams N , Morritt D G , Giele H P 
Published: April 2011

Abstract

Background
Excessive postoperative drainage following groin and axillary lymphadenectomy may be associated with a prolonged hospital stay and an increased complication rate. The use of fibrin sealant before wound closure may reduce postoperative wound drainage.

Methods
Consecutive patients undergoing elective groin or axillary lymphadenectomy were randomized to standard wound closure or to having fibrin sealant sprayed on to the wound bed before closure. Postoperative wound drainage, duration of drainage and complications were recorded, as were locoregional recurrence, distant metastasis and mortality.

Results
A total of 74 patients requiring 38 groin and 36 axillary dissections were randomized. The median postoperative wound drainage volume for the groin dissection cohort was 762 (range 25–3255) ml in the control group and 892 (265–2895) ml in the treatment group (P = 0·704). Drainage volumes in the axillary cohort were 590 (230–9605) and 565 (30–1835) ml in the control and treatment groups respectively (P = 0·217). There was no difference in the duration of drainage or postoperative complication rate between the treatment groups in both the axillary and groin cohorts. Local recurrence, distant metastasis and mortality rates did not differ between the treatment groups.

Conclusion
There was no advantage in using fibrin sealant during elective lymphadenectomy in terms of reducing drainage output or postoperative complication rate. Registration number: NCT00324272 (http://www.clinicaltrials.gov).
Hybrid aortic reconstruction for treatment of recurrent aortic obstruction after stage 1 single ventricle palliation: Medium term outcomes and results of redilation
Authors: Kutty Shelby , Burke Redmond P. , Hannan Robert L. , Zahn Evan M. 
Published: March 2011

AbstractObjective:We describe a hybrid approach to the treatment of aortic obstruction after stage 1 palliation (S1P) of hypoplastic left heart syndrome.Background:Recurrent aortic obstruction is a common problem after S1P of hypoplastic left heart syndrome. Even mild aortic obstruction is poorly tolerated so early and definitive therapy is desirable. Although stent implantation is an effective treatment for aortic obstruction in older children and adults, technical issues due to small vessels and concerns regarding future potential for expansion have generally precluded the use of stents in this setting.Methods:Six patients underwent hybrid aortic reconstruction (HAR) in the operating room or catheterization laboratory, with the interventional cardiologist and cardiac surgeon working in cooperation.Results:Patients had a mean weight of 5.8 kg (2.9–7.7) and a mean age of 5.6 months (0.5–12.9) at the time of HAR. Five patients had undergone prior balloon angioplasty at a mean age of 2.8 months (2.1–3.5), and five had moderately depressed single ventricular function prior to HAR. The balloons used had a diameter of 7–10 mm and introducer sheath size ranged from 6 to 10 F. There were no immediate or late procedure related complications. Stent redilation was performed in 5 patients for relief of recurrent obstruction or to keep pace with somatic growth. At a median follow up of 4.8 years (0.2–7.9), there were 3 patients progressing well after Fontan palliation and 3 deaths.Conclusions:HAR allows for placement of stents that can ultimately reach adult size in small infants who have recurrent aortic obstruction after balloon angioplasty following S1P. Advantages include freedom from delivery sheath constraints when determining stent type/size, facilitation of precise stent position, and avoidance of vascular damage or hemodynamic compromise during the procedure. Longer follow‐up and larger experience are required to determine if this therapy will provide a long‐term solution to this difficult problem. © 2011 Wiley‐Liss, Inc.
Hydrodynamic Behaviors in Gas‐Solid Two‐Phase Magnetic Fluidized Beds 1. Experimental Results Represented by a Dimensionless Number
Authors: Li H. , Cao C. , Zhao Y. 
Published: April 2011

AbstractThe influence of magnetic field intensity and process parameters on the transient fluidization behaviors of magnetically stable fluidized beds (MSFBs) was studied. The local solid holdup distribution and magnetically stabilized regimes were carried out by experimental measurements in MSFBs. The scaling approach for MSFB hydrodynamics based on magnetic field and dynamic similitude with a limited number of dimensionless groups was tested. A dimensionless number for magnetic field has been developed. An experimental criterion for the magnetically stabilized fluidization is established based on random analysis of the void fluctuation signal. It includes two characteristic parameters of the main frequency of voidage fluctuation signals, i.e., the self‐correlation function and variance. A dimensionless correlation to calculate the stable zone with three dimensionless groups of Er, Ar, and Re was proposed using dimensionless analysis.
Nucleotide Recognition in Water by a Guanidinium‐Based Artificial Tweezer Receptor
Authors: Kuchelmeister Hannes Y. , Schmuck Carsten 
Published: April 2011

AbstractThe water‐soluble tweezer receptor 1 with two symmetric peptidic arms, which are connected by an aromatic scaffold and contain lysine, phenylalanine, and a guanidinium‐based anion‐binding site as headgroup, has been synthesized. UV/Vis‐derived Job plots show that the receptor forms 1:1 complexes with nucleotides and phosphate in buffered water at neutral pH. Binding constants have been determined by fluorescence and UV/Vis spectroscopy. All nucleotides tested were bound very efficiently, even in pure water, with binding constants between 104 and 105 M−1. Interestingly, all mononucleotides were bound much stronger than phosphate by a factor of at least 5 to 10. Furthermore 1 favors the binding of adenosine monophosphate (AMP) over adenosine diphosphate (ADP) and adenosine triphosphate (ATP), which is unprecedented for artificial nucleotide receptors reported so far. According to NMR spectroscopy and molecular modeling studies, the efficient binding is a result of strong electrostatic contacts supported by π–π interactions with the nucleobase within the cavity‐shaped receptor.
Difunctionalisation of Arenes and Heteroarenes by Directed Metallation and Sulfoxide–Magnesium Exchange
Authors: Melzig Laurin , Rauhut Christian B. , Naredi‐Rainer Nikolaus , Knochel Paul 
Published: April 2011

AbstractThe aryl sulfoxide moiety allows an expedient two‐step difunctionalisation of readily available diaryl sulfoxides. Highly functionalised 1,2,4‐trisubstituted arenes and difunctionalised heteroarenes (furans, thiophenes, benzofurans and pyridines) were prepared in a two‐step sequence, triggered by an aryl sulfoxide group. In the first step, the sulfoxide moiety acts as a metallation‐directing group, allowing smooth ortho‐magnesiation with TMPMgCl⋅LiCl (TMP=tetramethylpiperidine). After a quenching reaction with an electrophile, the resulting sulfoxide is converted into a second magnesium reagent with iPrMgCl⋅LiCl (sulfoxide–magnesium exchange), which can be trapped with various electrophiles. Highly chemoselective TMPMgCl⋅LiCl and iPrMgCl⋅LiCl are compatible with a broad range of functional groups (e.g., F, Cl, CF3, CN, CO2tBu, alkynyl, ethers, thioethers). Large‐scale reactions (25–40 mmol) and the preparation of fully functionalised furans and thiophenes are also reported.
ChemInform Abstract: Structural Principles of Semiconducting Group 14 Clathrate Frameworks.
Authors: Karttunen Antti J. , Faessler Thomas F. , Linnolahti Mikko , Pakkanen Tapani A. 
Published: March 2011

AbstractThe basic clathrate frameworks, together with their polytypes, intergrowth clathrate frameworks, and extended frameworks based on larger icosahedral building blocks of carbon, silicon, germanium, and tin are investigated by quantum chemical DFT computations.
ChemInform Abstract: An Aqueous‐Solution Based Low‐Temperature Pathway to Synthesize Giant Dielectric CaCu3Ti4O12 — Highly Porous Ceramic Matrix and Submicron Sized Powder.
Authors: Banerjee Nirupam , Krupanidhi S. B. 
Published: March 2011

AbstractA microporous CaCu3Ti4O12 matrix is obtained from an aqueous solution containing Ti(OiPr)4, HNO3, Ca(NO3)2, and Cu(NO3)2 (1.
ChemInform Abstract: Properties and High‐Pressure Behavior of a Ternary Lead Oxide Pb2MnO4.
Authors: Serier‐Brault Helene , Jansen Martin 
Published: March 2011

AbstractPb2MnO4 and Sr‐doped Pb2MnO4 powders are synthesized by a polyesterification reaction based on the Pechini process using metal nitrates, citric acid, and ethylene glycol as starting materials.
ChemInform Abstract: A Novel Catalyst Precursor K2TiF6 with Remarkable Synergetic Effects of K, Ti and F Together on Reversible Hydrogen Storage of NaAlH4.
Authors: Liu Yongfeng , Liang Chu , Zhou Hai , Gao Mingxia , Pan Hongge , Wang Qidong 
Published: March 2011

AbstractThe new additive K2TiF6 remarkably improves the hydrogen storage performance of NaAlH4 due to the synergetic catalytic effect of K, Ti, and F.
ChemInform Abstract: New Quaternary Hydride CeZnSnH1.5: Structure, Magnetism, and Chemical Bonding.
Authors: Hermes Wilfried , Chavalier Bernard , Rodewald Ute Ch. , Matar Samir F. , Weill Francois , Schellenberg Inga , Poettgen Rainer , Lueken Heiko , Speldrich Manfred 
Published: March 2011

AbstractThe title compound is prepared from a CeZnSn precursor (obtained by induction melting of the elements in a sealed Ta ampule) upon hydrogenation at 553 K and 4 MPa H2.
ChemInform Abstract: A New Organic—Inorganic Hybrid Layered Molybdenum(V) Cobalt Phosphate Constructed from [H24(Mo16O32)Co16 (PO4)24(OH)4 (C5H4N)2(H2O)6] 4‐ Wheels and 4,4′‐Bipyridine Linkers.
Authors: Yu Kai , Zhou Bai‐Bin , Yu Yang , Su Zhan‐Hua , Yang Guo‐Yu 
Published: March 2011

AbstractThe novel layered phosphate (III) crystallizes in the monoclinic space group P21/n with Z = 2 (single crystal XRD).
ChemInform Abstract: Preparation and Thermoelectric Properties of AgPb18‐xSnxSbTe20 (x = 0.5, 1, 2, 4, 6) Materials.
Authors: Li H. , Cai K. F. , Wang H. F. , Li X. L. , Wang Y. Y. , Zhou C. W. 
Published: March 2011

AbstractThe title compounds are hydrothermally synthesized from aqueous mixtures of AgNO3, Pb(NO3)2, SnCl2, SbCl3, TeO2, KOH, and KBH4 (autoclave, 180 °C, 20 h) followed by melting at 1273 K for 5 h.
ChemInform Abstract: Axially Chiral C2‐Symmetric N‐Heterocyclic Carbene (NHC) Palladium Complex‐Catalyzed Asymmetric α‐Hydroxylation of β‐Keto Esters.
Authors: Cao Shu‐Hua , Shi Min 
Published: March 2011

AbstractThe asymmetric hydroxylation of indan‐1‐one‐2‐carboxylates using phenyloxaziridine as oxidant is catalyzed by a novel axially chiral NHC—Pd catalyst (BINCAP).
ChemInform Abstract: Synthesis of 5‐Arylidene‐2,4‐thiazolidinediones by Knoevenagel Condensation Catalyzed by Baker′s Yeast.
Authors: Pratap Umesh R. , Jawale Dhanaji V. , Waghmare Rahul A. , Lingampalle Dinesh L. , Mane Ramrao A. 
Published: March 2011

AbstractBaker′s yeast offers an eco‐friendly protocol for the Knoevenagel condensation of aromatic aldehydes with active methylene compounds.
ChemInform Abstract: Synthesis of Oxygen Heterocycles by Regioselective Heck Reaction.
Authors: McConville Matthew , Ruan Jiwu , Blacker John , Xiao Jianliang 
Published: March 2011

AbstractRegioselective Heck arylation of unsaturated alcohols followed by cyclization affords 2,2‐disubstituted tetrahydrofurans and tetrahydropyrans in a convenient one‐pot fashion.
ChemInform Abstract: Accessing the Antipodal Series in Microbial Arene Oxidation: A Novel Diene Rearrangement Induces by Tricarbonyliron(0) Complexation.
Authors: Khan Monika Ali , Lowe John P. , Johnson Andrew L. , Stewart Alan J. W. , Lewis Simon E. 
Published: March 2011

AbstractThe complexation of acetonide (I) with tricarbonyliron is accompanied by an isomerization to afford complex (III).