bluuebunny/crossref_metadata_2025_split huggingface dataset:
Untersuchung des Bemessungsansatzes der VDI 2719 für den Schallschutz von Fenstern unter Berücksichtigung unterschiedlicher Außenlärmspektren
Authors: Kübler Bernhard , Schedl Katharina 
Published: August 2017

AbstractGegenstand dieser Arbeit ist die Untersuchung des Bemessungsansatzes der VDI Richtlinie – VDI 2719/1987‐08 für den Schallschutz von Fenstern unter Berücksichtigung verschiedener Außenlärmpegelspektren. Das Leitmotiv stellt die Problematik der heute in der Praxis festgestellten Fehlbemessung des Schallschutzes bei Verwendung der in VDI 2719 enthaltenen Korrektursummanden dar. Der Ansatz zur Verwendung verschiedener Korrektursummanden in VDI 2719/1987‐08 basiert auf einer 1985 vom Umweltbundesamt in Auftrag gegebenen Forschungsarbeit von Moll und Szabunia. Die K‐Summanden berücksichtigen sowohl die Frequenzabhängigkeit der Fenster‐Schalldämmung als auch der Spektren des Außenlärms, welche sich beide im Laufe der Zeit verändert haben. Mit dieser Arbeit soll eine Basis geschaffen werden, auf der – anhand heute typischer Konstruktionen und Außenlärmsituationen – die erforderliche Schalldämmung der Fenster ohne erhebliche Über‐ oder Unterbemessung des Schallschutzes ermittelt werden kann.
Geokunststoffbewehrte Brückenwiderlager
Authors: Vollmert Lars , Klompmaker Jörg , Pauls Waldemar 
Published: August 2017

AbstractGeokunststoffbewehrte Erdbauwerke (KBE) haben durch entsprechende Langzeiterfahrung mit den verwendeten Bauprodukten und den ausgeführten Konstruktionen einen hohen Reifegrad erreicht. Über die reine Nutzung als Steilböschung und Stützkonstruktion hinausgehend, werden sie im europäischen Umfeld zunehmend als Brückenwiderlager eingesetzt. Der geokunststoffbewehrte Erdkörper stellt dann das Widerlager selbst dar, auf dem ein Betonfundament als Träger der Brückenlager aufgesetzt wird. Die Konstruktionsweise stellt damit eine Mischung aus geotechnischen Verfahren und konstruktivem Ingenieurbau dar.Infolge der Komplexität der aufgehenden geotechnischen Konstruktion im Zusammenspiel mit den hohen, lokal konzentrierten Flächenlasten ergeben sich besondere Anforderungen an die Bemessung, die Prognose von Verformungen und die Robustheit der Konstruktion. Vor diesem Hintergrund gewinnen Ergebnisse aus großmaßstäblichen Versuchen, insbesondere zum Verformungsverhalten der Gesamtkonstruktion unter Berücksichtigung des Bauverfahrens, sowie Erfahrungen und Beispiele aus der Praxis besondere Bedeutung.
Why do long‐serving teachers stay in the teaching profession? Analysing the motivations of teachers with 10 or more years’ experience in England
Authors: Chiong Charleen , Menzies Loic , Parameshwaran Meenakshi 
Published: August 2017

This paper examines the reasons why long‐serving teachers remain in the teaching profession. Interest in teacher retention has grown in recent years, both in the UK and internationally, due to concerns over teacher shortage. However, most research on retention has focused on why teachers leave; this paper aims to fill the gap in our understanding of the positive reasons why long‐serving teachers stay in the profession, and how these reasons change over time. We define ‘long‐serving teachers’ as teachers who have taught for 10 years and more. We draw on a subset of data from an existing, broader study (Menzies et al., ) on why teachers enter and stay in the profession. In this paper, we draw on questionnaire findings from over 900 teachers with 0 to over 30 years’ teaching experience, and interviews with 14 long‐serving teachers, to understand why long‐serving teachers enter and, more importantly for our purposes, stay in teaching. We find that teachers’ motivational patterns are highly complex and influenced by school‐level and policy contexts. Nonetheless, two prominent retention factors are identified: teachers’ perceived professional mastery and altruistic reasons. Perceived professional mastery is particularly important due to its mutually reinforcing analytic relationships with other reasons. We find that teachers’ identification with intrinsic, altruistic and perceived professional mastery reasons become stronger with years of experience, but in some cases, paradoxically, so does their identification with extrinsic reasons. From our evidence, we suggest policy implications for enhancing the retention of long‐serving teachers.
Design and implementation of a real‐time monitoring tool for power engineering education
Authors: Rocha‐Doria Juan S. , Mosquera‐Arevalo Octavio A. , Angeles‐Camacho César , Espinel‐Ortega Alvaro , Calderón‐Guizar Jorge G. 
Published: August 2017

ABSTRACTThis article reports on the implementation of a real‐time monitoring system in a laboratory test grid based on synchrophasorial measurement units. The system consists of the installation of different types of units for monitoring the electrical parameters of the network. The information is transmitted to a power data concentrator equipment, through a local area network under TCP/IP protocol. All the information received is properly processed and systematically stored for future use. A graphical application was developed to visualize the information in real‐ time or to perform off‐line power analyses. The functionality of the monitoring system was verified on several test grids and is used for teaching and research for both undergraduate and postgraduate students in the power electronics laboratory at the Engineering Institute of the Universidad Nacional Autónoma de México.
Holistic therapy with disabled adults from a social and individual perspective: A service evaluation feasibility study
Authors: Halacre Mèlani , Jalil Rahul 
Published: August 2017

AbstractAimDisabled adults require better access to tailored psychological therapy. A purpose‐developed intervention model was implemented at a nonprofit organisation in the UK. The aim was to consider the utility of this approach, designed to accommodate and thereby reduce psychological distress, and to inform future service evaluations, to effectively meet the needs of this client group.MethodA one group pre and post‐test design was employed on the retrospective routine collected data, for clients in receipt of 1‐2‐1 therapy. Fifty‐three of the 91 clients (58%) completed the Clinical Outcomes in Routine Evaluation‐Outcome Measure (CORE‐OM) at pre and post‐therapy. Common presenting issues for therapy included symptoms of depression, anxiety, coping strategies and spousal relationship issues. Data were subjected to descriptive analyses.ResultsAt pretherapy, 91% (n = 83) were categorised as within the clinical range; 52% were either classified at a moderate (n = 23) or moderate‐to‐severe level (n = 24). A paired‐sample t‐test indicated a statistically significant difference in mean scores between pre‐ and post‐CORE‐OM assessments. Thirty clients (57%) met the criteria for reliable change in a favourable direction (improved), with 19 (36%) meeting the criteria for clinically significant change (recovered). Twenty‐two clients (41%) remained unchanged in terms of clinical severity category and one client (2%) deteriorated.ConclusionsA purpose‐developed intervention model comprising a holistic, flexible therapy approach to some extent reduces psychological distress.
Are rupture–repair episodes related to outcome in the treatment of trauma‐exposed World Trade Center responders?
Authors: Haugen Peter T. , Werth Aditi S. , Foster Alyce L. , Owen Jesse 
Published: August 2017

AbstractObjectiveThis study aimed to examine rupture–repair (R–R) episodes in a sample of adult World Trade Center responders (N = 32) who engaged in integrative psychotherapy for the treatment of posttraumatic stress disorder (PTSD) in an outpatient clinic.MethodParticipants rated therapeutic alliance after each session, and presence of R–R episodes was calculated throughout the course of treatment. We predicted that patients who experienced R–R episodes would have significantly better treatment outcomes than those who did not.ResultsANCOVA analyses indicated that the presence or absence of R–R episodes was not meaningfully related to treatment outcome, with the exception of the Goals & Task domain of alliance, which was meaningfully related to improved outcome.ConclusionsAttending to disagreements regarding treatment Goals & Task may be uniquely important for individuals with PTSD.
Supported Ru Metalloporphyrins for Electrocatalytic CO2 Conversion
Authors: Szkaradek Kinga , Buzar Krzysztof , Pidko Evgeny A. , Szyja Bartłomiej M. 
Published: August 2017

AbstractThis paper reports for the first time a computational analysis of the redox properties of graphene‐supported Ru‐porphyrins as potential catalytic materials for electrochemical CO2 reduction. Density functional theory reveals that such catalytic ensembles can efficiently activate both CO2 and CH4 molecules indicating their generic utility as C1‐functionalization catalysts. The charge transfer from the graphene surface to the catalytic Ru centers influences the thermodynamic stability of the key reaction intermediates and therefore determines the selectivity of the electrochemical process. The electrochemical reduction of CO2 can yield CO or methane, depending on the applied potential and reaction conditions. Calculations also identified alternative paths towards methanol and formic acid.
Highly Enantioselective C−H Oxidation of Arylalkanes with H2O2 in the Presence of Chiral Mn‐Aminopyridine Complexes
Authors: Talsi Evgenii P. , Samsonenko Denis G. , Ottenbacher Roman V. , Bryliakov Konstantin P. 
Published: August 2017

AbstractBioinspired chiral Mn‐aminopyridine complexes [(S,S)‐LMnII(OTf)2] and [(R,R)‐LMnII(OTf)2] (where (S,S)‐L=(2S,2′S)‐1,1′‐bis((3‐methyl‐4‐(2,2,2‐trifluoroethoxy)pyridin‐2‐yl)methyl)‐2,2′‐bipyrrolidine, and (R,R)‐L=(2R,2′R)‐1,1′‐bis((3‐methyl‐4‐(2,2,2‐trifluoroethoxy)pyridin‐2‐yl)methyl)‐2,2′‐bipyrrolidine) have been shown to efficiently catalyze the benzylic C−H oxidation of arylalkanes with hydrogen peroxide in the presence of carboxylic acid additives, affording enantiomerically enriched 1‐arylalkanols and the corresponding ketones. Optically pure additive N‐Boc‐(L)‐proline, in combination with [(R,R)‐LMnII(OTf)2] complex, affords 1‐arylalkanols in up to 86 % ee, which is the highest reported enantioselectivity for direct benzylic hydroxylations with H2O2 in the presence of transition‐metal catalysts. Oxidative kinetic resolution only slightly contributes to the increase of the observed enantiomeric excess over the reaction course. The observed kH/kD values (3.5–3.6 for the oxidation of ethylbenzene/d10‐ethylbenzene) and competitive oxidation data are consistent with either a hydrogen‐atom transfer/oxygen rebound or hydride transfer/oxygen rebound asymmetric hydroxylation mechanism.
Freeze Drying as a Novel Approach to Improve Charge Transport in Titanium Dioxide Nanorod Arrays
Authors: Zhong Peng , Chen Xinpeng , Xi He , Lei Yimin , Ma Xiaohua 
Published: August 2017

AbstractOrdered TiO2 nanostructure arrays, such as hydrothermal nanorod arrays (NRAs) and anodic nanotube arrays, have attracted great attention in solar cells, photocatalysis, and so on, mainly owing to their vertically aligned 1D architectures. However, the device performances are limited by their poor electronic properties, owing to the morphology collapse and surface adsorbates. In this work, a novel freeze‐drying technique has been used to post‐treat hydrothermal TiO2 NRAs. The freeze‐drying treatment not only leads to a well‐preserved nanoarray morphology, but also induces complete removal of adsorbed chlorine on the TiO2 surface. The light‐scattering feature and the energy band structure have thus changed after freeze drying as compared to common air drying. As a result, the charge transfer at the TiO2/electrolyte interface and the collection efficiency of photo‐excited electrons through the TiO2 NRAs are substantially improved, leading to the performance enhancement of model solar cells.
Embedded Isoreticular Zeolites: Concept and Beyond
Authors: Cho Jung , Choi Hyun June , Guo Peng , Shin Jiho , Zou Xiaodong , Hong Suk Bong 
Published: August 2017

AbstractThe structure solution, prediction, and targeted synthesis of a family of embedded isoreticular zeolites (EIZs) with expanding structural complexity, denoted the RHO family, were reported recently. Here, the naming and building rules of body‐centered cubic EIZs with the lta cage as the lattice point are presented. The rearrangement of a pair of pau and d8r cages between two lta cages and its repetitive insertion, combined with the strong reflections and fragment methods, allows the creation of three other new zeolite families, designated the HPO, RHO(b), and KFI families. Among them, the KFI family is found to be the only EIZ family, on the basis of the similarity of structure factor amplitudes and phases of strong reflections, that is, structural coding, within its family members. The structural credibility of this family is confirmed by both local interatomic distances and T−T−T angle analyses. The existence of tetragonal EIZ families is also demonstrated. The overall results provide useful insights into the prediction of unprecedented EIZ families.
Unveiling NIR Aza‐Boron‐Dipyrromethene (BODIPY) Dyes as Raman Probes: Surface‐Enhanced Raman Scattering (SERS)‐Guided Selective Detection and Imaging of Human Cancer Cells
Authors: Adarsh Nagappanpillai , Ramya Adukkadan N. , Maiti Kaustabh Kumar , Ramaiah Danaboyina 
Published: August 2017

AbstractThe development of new Raman reporters has attracted immense attention in diagnostic research based on surface enhanced Raman scattering (SERS) techniques, which is a well established method for ultrasensitive detection through molecular fingerprinting and imaging. Herein, for the first time, we report the unique and efficient Raman active features of the selected aza‐BODIPY dyes 1–6. These distinctive attributes could be extended at the molecular level to allow detection through SERS upon adsorption onto nano‐roughened gold surface. Among the newly revealed Raman reporters, the amino substituted derivative 4 showed high signal intensity at very low concentrations (ca. 0.4 μm for 4‐Au). Interestingly, an efficient nanoprobe has been constructed by using gold nanoparticles as SERS substrate, and 4 as the Raman reporter (4‐Au@PEG), which unexpectedly showed efficient recognition of three human cancer cells (lung: A549, cervical: HeLa, Fibrosarcoma: HT‐1080) without any specific surface marker. We observed well reflected and resolved Raman mapping and characteristic signature peaks whereas, such recognition was not observed in normal fibroblast (3T3L1) cells. To confirm these findings, a SERS nanoprobe was conjugated with a specific tumour targeting marker, EGFR (Epidermal Growth Factor Receptor), a well known targeted agent for Human Fibrosarcoma (HT1080). This nanoprobe efficiently targeted the surface marker of HT1080 cells, threreby demonstrating its use as an ultrasensitive Raman probe for detection and targeted imaging, leaving normal cells unaffected.
Recycling of Rare Earths from FeNdB‐Magnets by Solid State Chlorination
Authors: Lorenz Tom , Fröhlich Peter , Bertau Martin 
Published: August 2017

AbstractDie Feststoffchlorierung mit NH4Cl als chlorierendem Agens ist ein neuer Ansatz für den Aufschluss von Altmagneten, die Seltene Erden enthalten. Er bietet gegenüber hydrometallurgischen Ansätzen eine Reihe wirtschaftlicher Vorteile. Das Verfahren wurde an FeNdB‐Altmagneten einer Windkraftanlage ausgearbeitet und hinsichtlich der SE‐Ausbeute mittels 33‐Box‐Behnken‐Plan optimiert. Dabei wurden Temperatur, Zeit und NH4Cl/Magnet‐Verhältnis variiert. Zugleich profitiert der Prozess von einer nachfolgenden Laugung mit einem verdünnten Natriumacetat/Essigsäure‐Puffer.
A smart service model in greenhouse environment using event‐based security based on wireless sensor network
Authors: Sivamani Saraswathi , Choi Jongsun , Bae Kitae , Ko Hoon , Cho Yongyun 
Published: August 2017

SummaryIn the smart agricultural environment such as greenhouse or vertical farm, the automation process is performed using the environment sensors to maintain the growth of the crops. Currently, the system rely on the defined rule to perform automation, but the situation can turn catastrophic. With the interruption in the communication, data forging, or eavesdropping, the crops will be rotten and destroyed. Therefore, to maintain the automation without failure, the connection needs to be secure and tampering has to be avoided. In this paper, we discuss the security solution for the wireless sensor networks in the automated agricultural environment without any human intervention. The sink node that collects the sensor values organizes the data and transfer the data to the server, along with the XML encryption and private key mechanism for the communication. The secure protocol is used to make connection using the private key, XML ecryption prevents the system from eavesdropping, and forging. Some of the events discussed in the papers are EVNData, SENSORError, DDoSAttack, and ConnThreat. With the help of the event and the tag information, the data security and confidentiality is increased, for the better automation and crop growth.
Two‐Dimensional Materials as Prospective Scaffolds for Mixed‐Matrix Membrane‐Based CO2 Separation
Authors: Zhu Xiang , Tian Chengcheng , Do‐Thanh Chi‐Linh , Dai Sheng 
Published: August 2017

AbstractMembrane‐based CO2 separation technology plays a significant role in environmental remediation and clean energy. Two‐dimensional (2D) materials with atomically precise structures have emerged as prospective scaffolds to develop mixed‐matrix membranes (MMMs) for gas separation. Summarized in this perspective review are the latest breakthrough studies in the synthesis of 2D‐material‐based MMMs to separate CO2 from gas mixtures. 2D materials including graphene oxide (GO), metal–organic framework (MOF)‐derived nanosheets, covalent organic frameworks (COFs), and transition metal dichalcogenides (TMDs), as fascinating building blocks, have been comprehensively summarized, together with a focus on synthetic processes and gas separation properties. Challenges and the latest advances in the manufacture of novel synthetic 2D materials are briefly discussed to foresee emerging opportunities for the development of new generations of 2D‐material‐based MMMs.
Accounting for imperfect detection of groups and individuals when estimating abundance
Authors: Clement Matthew J. , Converse Sarah J. , Royle J. Andrew 
Published: August 2017

AbstractIf animals are independently detected during surveys, many methods exist for estimating animal abundance despite detection probabilities <1. Common estimators include double‐observer models, distance sampling models and combined double‐observer and distance sampling models (known as mark‐recapture‐distance‐sampling models;MRDS). When animals reside in groups, however, the assumption of independent detection is violated. In this case, the standard approach is to account for imperfect detection of groups, while assuming that individuals within groups are detected perfectly. However, this assumption is often unsupported. We introduce an abundance estimator for grouped animals when detection of groups is imperfect and group size may be under‐counted, but not over‐counted. The estimator combines anMRDSmodel with an N‐mixture model to account for imperfect detection of individuals. The newMRDS‐Nmix model requires the same data as anMRDSmodel (independent detection histories, an estimate of distance to transect, and an estimate of group size), plus a second estimate of group size provided by the second observer. We extend the model to situations in which detection of individuals within groups declines with distance. We simulated 12 data sets and used Bayesian methods to compare the performance of the newMRDS‐Nmix model to anMRDSmodel. Abundance estimates generated by theMRDS‐Nmix model exhibited minimal bias and nominal coverage levels. In contrast,MRDSabundance estimates were biased low and exhibited poor coverage. Many species of conservation interest reside in groups and could benefit from an estimator that better accounts for imperfect detection. Furthermore, the ability to relax the assumption of perfect detection of individuals within detected groups may allow surveyors to re‐allocate resources toward detection of new groups instead of extensive surveys of known groups. We believe the proposed estimator is feasible because the only additional field data required are a second estimate of group size.
Employing antenna selection to improve energy efficiency in massive MIMO systems
Authors: Arash Masoud , Yazdian Ehsan , Fazel Mohammad Sadegh , Brante Glauber , Imran Muhammad Ali 
Published: August 2017

AbstractMassive multi‐input–multi‐output systems promise high data rates by using a large number of antennas, which also increases the power usage of the system as a consequence. This creates an optimization problem that specifies how many antennas the system should use to operate with maximal energy efficiency (EE). Our main goal is to consider a base station with a fixed number of antennas, such that the system can operate with a smaller subset of antennas according to the number of active user terminals, which may vary over time. Thus, in this paper, we propose an antenna selection algorithm, which selects the best antennas according to the better channel conditions with respect to the users, aiming at improving the overall EE. Then, due to the complexity of the mathematical formulation, a tight approximation for the consumed power is presented, using the Wishart theorem, and it is used to find a deterministic formulation for the EE. Simulation results show that the approximation is quite tight and that there is significant improvement in terms of EE when antenna selection is used.
Efficient rendezvous schemes for fast‐varying cognitive radio ad hoc networks
Authors: Al‐Mqdashi Abdulmajid , Sali A. , Abdel‐Rahman Mohammad J. , Noordin Nor Kamariah , Hashim Shaiful J. , Nordin Rosdiadee 
Published: August 2017

AbstractRendezvous is a fundamental operation for establishing communications between cognitive radios in a cognitive radio ad hoc network (CRAHN). Channel hopping (CH) provides an effective method for achieving rendezvous without relying on a dedicated common control channel. Most of the existing CH‐based rendezvous schemes were not designed for CRAHNs operating under fast primary user (PU) dynamics and result in excessive rendezvous delay when applied in such dynamic environments. To cope with fast PU dynamics, we propose in this paper two efficient cyclic‐quorum–based CH rendezvous schemes, which we refer to as nested cyclic quorum channel hopping (NCQ‐CH) and minimal nested cyclic quorum channel hopping (MNCQ‐CH). The proposed schemes are tailored for the spectrum‐heterogeneous CRAHNs. In addition to proactively accounting for PU dynamics, our CH‐based rendezvous schemes are designed to react to fast PU dynamics on the fly. To achieve this online adaptation, we augment NCQ‐CH and MNCQ‐CH with efficient mechanisms for channel ranking and quorum selection. Our simulations demonstrate the superior performance of the proposed schemes under fast PU dynamics, in terms of the time‐to‐rendezvous and PU detection accuracy, as compared with existing rendezvous schemes in the literature.