bluuebunny/crossref_metadata_2025_split huggingface dataset:
Quasi‐elliptic dual‐band planar BPF with high‐selectivity and high inter‐band isolation for 5G communications systems
Authors: Riaz Muhammad , Virdee Bal S. , Shukla Pancham , Ouazzane Karim , Onadim Muhittin , Salekzamankhani Shahram 
Published: December 2019

AbstractA novel dual‐band planar bandpass filter structure is presented that exhibits the following characteristics: (a) a quasi‐elliptic function response with high passband selectivity; (b) high inter‐band isolation; and (3) a wide out‐of‐band rejection. The filter is suitable for highly demanding wireless communications systems where the channel capacity is at a premium. The via‐free dual‐band filter consists of open‐loop resonators that are shunt loaded with a half‐wavelength open‐circuit stub. The resonators are coupled electromagnetically to the stepped impedance resonators, which are inter‐digitally coupled to the input/output feed lines. Altering the dimensions of the two stubs allow modification of the resonant mode and transmission zero frequencies. Measured results validate the filter's performance. The center frequencies of the two passband responses at 4.6 GHz and 5.4 GHz have 3‐dB fractional bandwidth of 13.5% and 11.5%, respectively. Insertion‐loss at the two passband center frequencies are 1.02 and 0.8 dB, and the return‐loss is better than 20 dB. Skirt steepness of the filter is >290 dB/GHz, and isolation between the two closely positioned adjacent bands is better than 35 dB.
Advanced glycation end products and chronic inflammation in adult survivors of childhood leukemia treated with hematopoietic stem cell transplantation
Authors: Felicetti Francesco , Cento Alessia Sofia , Fornengo Paolo , Cassader Maurizio , Mastrocola Raffaella , D'Ascenzo Fabrizio , Settanni Fabio , Benso Andrea , Arvat Emanuela , Collino Massimo , Fagioli Franca , Aragno Manuela , Brignardello Enrico 
Published: December 2019

AbstractBackgroundAmong survivors of pediatric acute lymphoblastic leukemia (ALL), those who received hematopoietic stem cell transplantation (HSCT) conditioned with total‐body irradiation (TBI) show the highest risk of late complications, including cardiovascular (CV) disease. Advanced glycation end products (AGEs) have been associated with CV disease in diabetes mellitus and other clinical conditions. This study explores AGEs plasma levels, inflammatory status, and lipid profile in survivors of pediatric ALL who received HSCT conditioned with TBI.ProcedureInclusion criteria were (a) previous diagnosis of ALL at age < 18 years, treated with HSCT conditioned with TBI; (b) age > 18 at the time of the study enrollment; (c) off‐therapy for at least five years. Radiotherapy other than TBI, preexisting heart disease, glucose metabolism impairment, body mass index > 25, active graft versus host disease (GvHD), smoking, or treatment with cholesterol lowering medications were exclusion criteria. Eighteen survivors and 30 age‐matched healthy controls were enrolled.ResultsAGEs plasma levels were markedly higher in ALL survivors than in healthy subjects (2.15 ± 2.21 vs 0.29 ± 0.15 pg/mL, P < 0.01). Survivors also showed higher levels of high‐sensitivity C‐reactive protein (2.32 ± 1.70 vs 0.88 ± 1.09 mg/dL, P < 0.05), IL‐1β (7.04 ± 1.52 vs 4.64 ± 2.02 pg/mL, P < 0.001), IL17 (37.44 ± 3.51 vs 25.19 ± 6.34 pg/mL, P < 0.001), an increased glutathione/reduced glutathione ratio (0.085 ± 0.07 vs 0.041 ± 0.036, P < 0.05) and slight alterations in their lipid profile.ConclusionsOur data show AGEs accumulation and chronic inflammation in ALL survivors who received HSCT conditioned with TBI. These alterations may contribute to the increased risk of CV disease reported in these subjects.
Vaporization and thermodynamics of ceramics in the Sm2O3‐Y2O3‐HfO2 system
Authors: Kablov Eugene N. , Stolyarova Valentina L. , Vorozhtcov Viktor A. , Lopatin Sergey I. , Shugurov Sergey M. , Shilov Andrey L. , Karachevtsev Fedor N. , Medvedev Pavel N. 
Published: December 2019

RationaleThe Sm2O3‐Y2O3‐HfO2 system holds promise for applications in the sphere of high‐temperature technologies, particularly the development of ultra‐high‐temperature ceramics. However, the reliability of refractory materials is dependent on the possible selective vaporization of their components leading to changes in their physicochemical properties. Thus, information about vaporization processes and thermodynamic properties of ceramics based on the Sm2O3‐Y2O3‐HfO2 system may be of importance for the production of high‐temperature materials as well as for the prediction of the physicochemical properties of ultra‐high‐temperature ceramics.MethodsThe Knudsen effusion mass spectrometric method was used, with an MS‐1301 magnetic mass spectrometer equipped with a tungsten twin effusion cell used to examine the samples in the Sm2O3‐Y2O3‐HfO2 system. Electron ionization of vapor species effusing from the cell was carried out at an ionization energy of 25 eV.ResultsIt was shown that at a temperature of 2373 K, selective vaporization of Sm2O3 and Y2O3 occurred in the samples of the Sm2O3‐Y2O3‐HfO2 system, with the main vapor species being SmO, Sm, YO, and O. The partial pressures of these vapor species were obtained by the ion current comparison method. The Sm2O3 activities in the Sm2O3‐Y2O3‐HfO2 system were determined and allowed the evaluation of the excess Gibbs energies at 2373 K. The direction of change of the condensed phase of the samples because of selective vaporization of the components was examined.ConclusionsThe Sm2O3‐Y2O3‐HfO2 system was characterized by negative deviations from the ideal behavior at 2373 K. The excess Gibbs energies evaluated in the present study were approximated using the Redlich‐Kister representation and visualized in the form of curves of constant values in the concentration triangle. The data obtained in the Sm2O3‐Y2O3‐HfO2 system were optimized using the Barker‐Guggenheim theory of associated solutions.
Catalytic Conversion of Biomass‐Derived Carbohydrates into Levulinic Acid Assisted by a Cationic Surface Active Agent
Authors: Onkarappa Sharath Bandibairanahalli , Bhat Navya Subray , Parashuram Devaraj , Dutta Saikat 
Published: December 2019

AbstractLevulinic acid (LA), a bio‐renewable chemical building block, has been produced in good isolated yields by treating biomass‐derived carbohydrates with aqueous hydrochloric acid in the presence of quaternary ammonium salts as cationic surface‐active agent (SAA). Under optimized conditions (120 °C, 3 h, 20.2% HCl), the one‐pot process afforded LA in 80% isolated yield from glucose using only 5.77 mol% (10 wt%) of benzyltributylammonium chloride (BTBAC) at the SAA. The control reaction (no BTBAC) provided LA in only 64% yield from glucose under identical conditions. The process was optimized on the reaction temperature, loading of BTBAC, and the concentration of HCl. The use of BTBAC led to a nearly 8–17% increase in yield of LA (compared to the control reaction) for all the carbohydrates studied.
Unprecedented Formation of 2‐Chloro‐5‐(2‐chlorobenzyl)‐4,5,6,7‐tetrahydrothieno[3,2‐c]pyridine 5‐oxide via Oxidation‐Chlorination Reaction Using Oxone: A Combination of Synthesis and 1D‐2D NMR Studies
Authors: Krake Everaldo F. , Baumann Wolfgang 
Published: December 2019

AbstractTiclopidine hydrochloride (1⋅HCl, Ticlid™) is a prodrug that, through bioactivation by cytochrome P450 (CYP), interacts with the P2Y12 receptor ADP inhibiting platelet aggregation. This prodrug mediated by a multistep biochemical process led to the formation of active metabolic intermediates. In this work, an eco‐friendly and efficient protocol for the formation of 2‐chloroticlopidine (2) using 1⋅HCl and oxone in aqueous methanol media via an unprecedented formation of reactive thienopyridine intermediate 2‐chloro‐5‐(2‐chlorobenzyl)‐4,5,6,7‐tetrahydrothieno[3,2‐c]pyridine 5‐oxide (4) was developed. The key to success of 4 is the oxidation of tertiary amines to N‐oxides, followed by mono‐chlorination at the 2‐position of the thiophene ring by oxidation of the chloride counterion of this prodrug. In addition, we use the 1D and 2D NMR techniques as a tool to monitor reaction progress, and for assigning the signals of all compounds involved, especially for the novel thienopyridine 4.
Beitrag zur Dimensionierung von Halsnähten luftdichter Hohlkästen unter temperaturinduziertem Innendruck
Authors: Radtke Frank Kurt Friedrich , Schubart Ralf 
Published: December 2019

AbstractHerrn Prof. Dr.‐Ing. Peter Schaumann zum 65. Geburtstag gewidmetDichtgeschweißte Stahlhohlkästen sind eine effiziente und erprobte Bauweise im Stahl‐ und Stahlverbundbrückenbau. Die Prüfung und Inspektion innen liegender Schweißnähte ist jedoch nur bedingt oder gar nicht möglich, sodass eine robuste Ausführung innen liegender Schweißnähte geboten ist. Nun haben Messungen bestätigt, dass es in dichtgeschweißten Stahlhohlkästen zu nennenswerten Veränderungen des Innendrucks in Abhängigkeit von der Temperatur kommt. Die daraus resultierenden Druckunterschiede zwischen Innen‐ und Umgebungsluftdruck stellen eine nicht zu vernachlässigende – bisher aber nicht berücksichtigte – zusätzliche Belastung der Halsnähte dar. Es wird ein ingenieurpraktischer Ansatz zur Dimensionierung ebendieser Halsnähte dichtgeschweißter Hohlkästen unter sowohl Schubbelastung aus der Haupttragwerkswirkung als auch Biegebelastung aus temperaturinduziertem Innendruck hergeleitet. Verschiedene Einflussgrößen werden untersucht und die Ergebnisse werden in vereinfachten Berechnungsansätzen zusammengefasst, deren Anwendung kurz dargestellt wird.
Das Mannesmann‐Hochhaus Düsseldorf
Authors: Hauke Bernhard 
Published: December 2019

AbstractDas Mannesmann‐Hochhaus wurde 1955–1958 am Düsseldorfer Rheinufer für den Industriekonzern als Verwaltungsgebäude neben dem bestehenden Stammhaus gebaut. Dass die Stadtsilhouette prägende Gebäude im Stile der Nachkriegsmoderne ist eines der ersten modernen Hochhäuser Deutschlands. Neben dem Architekten Paul Schneider‐Esleben ist es insbesondere das Verdienst des Tragwerksplaners Georg Lewenton, dass dieses schlanke und transparente Gebäude so möglich wurde. Beraten und unterstützt haben auch Fritz Leonhardt (TH Stuttgart) bei den Knaggen‐Anschlüssen an die Stützen aus Mannesmannrohren oder Theodor Kristen (TH Braunschweig) bei den Versuchen mit dünnen Brandschutzputzen. Das Mannesmann‐Hochhaus ist ein schönes Beispiel, dass sichtbare architektonische Leistungen auch immer die weniger sichtbaren Beiträge der planenden und forschenden Ingenieure und einer innovativen Industrie bedürfen.
Seismic response of RC buildings subjected to fling‐step in the near‐fault region
Authors: Hamidi Hamed , Karbassi Amin , Lestuzzi Pierino 
Published: December 2019

AbstractFling‐step and forward directivity are the major consequences of near‐fault ground motions as they can impose unexpected seismic demands on structures located in the vicinity of the fault. The pernicious effect of forward directivity on the seismic behavior of structures has been studied widely. However, not much research has been conducted to investigate the influence of fling‐step that is related to a large co‐seismic displacement. Moreover, the inconsistent results reported in the literature create a scientific challenge about the effect of fling‐step on the seismic behavior of long‐period structures. In this paper, the effect of fling‐step is studied by comparing the displacement ductility demand in various single degree of freedom systems with different natural frequencies and strength reduction factors, subjected to long‐period ground motions (generated and as‐recorded) with and without fling‐step. Subsequently, two 11‐ and 20‐story reinforced concrete buildings are considered and the effect of removing the fling‐step on their maximum inter‐story drifts is studied. The results indicate that the ratio of the fundamental period of the structure to the fling‐pulse period plays an important role and the demands imposed on those systems without fling‐step may increase or decrease based on the ground motions type and structural characteristics. Also, a similar trend in the displacement ductility demand was observed in this condition.
The S-matrix bootstrap. Part III: higher dimensional amplitudes
Authors: Paulos Miguel F. , Penedones Joao , Toledo Jonathan , van Rees Balt C. , Vieira Pedro 
Published: December 2019

AbstractWe consider constraints on the S-matrix of any gapped, Lorentz invariant quantum field theory in 3+1 dimensions due to crossing symmetry, analyticity and unitarity. We extremize cubic couplings, quartic couplings and scattering lengths relevant for the elastic scattering amplitude of two identical scalar particles. In the cases where our results can be compared with the older S-matrix literature they are in excellent agreement. We also extremize a cubic coupling in 2+1 dimensions which we can directly compare to a universal bound for a QFT in AdS. This paper generalizes our previous 1+1 dimensional results of [1] and [2].
The Impact of Peer Assessment on Academic Performance: A Meta-analysis of Control Group Studies
Authors: Double Kit S. , McGrane Joshua A. , Hopfenbeck Therese N. 
Published: December 2019

AbstractPeer assessment has been the subject of considerable research interest over the last three decades, with numerous educational researchers advocating for the integration of peer assessment into schools and instructional practice. Research synthesis in this area has, however, largely relied on narrative reviews to evaluate the efficacy of peer assessment. Here, we present a meta-analysis (54 studies, k = 141) of experimental and quasi-experimental studies that evaluated the effect of peer assessment on academic performance in primary, secondary, or tertiary students across subjects and domains. An overall small to medium effect of peer assessment on academic performance was found (g = 0.31, p < .001). The results suggest that peer assessment improves academic performance compared with no assessment (g = 0.31, p = .004) and teacher assessment (g = 0.28, p = .007), but was not significantly different in its effect from self-assessment (g = 0.23, p = .209). Additionally, meta-regressions examined the moderating effects of several feedback and educational characteristics (e.g., online vs offline, frequency, education level). Results suggested that the effectiveness of peer assessment was remarkably robust across a wide range of contexts. These findings provide support for peer assessment as a formative practice and suggest several implications for the implementation of peer assessment into the classroom.
Testing for the emergence of spontaneous order
Authors: Georgalos Konstantinos , Hey John 
Published: December 2019

AbstractWe report on an experimental investigation of the emergence of Spontaneous Order, the idea that societies can co-ordinate, without government intervention, on a form of society that is good for its citizens, as described by Adam Smith. Our experimental design is based on a production game with a convex input provision possibility frontier, where subjects have to choose a point on this frontier. We start with a simple society consisting of just two people, two inputs, one final good and in which the production process exhibits returns to specialisation. We then study more complex societies by increasing the size of the society (groups of 6 and 9 subjects) and the number of inputs (6 and 9 inputs respectively), as well as the combinations of inputs that each subject can provide. This form of production can be characterised as a cooperative game, where the Nash equilibrium predicts that the optimal outcome is achieved when each member of this society specialises in the provision of a single input. Based on this framework, we investigate whether Spontaneous Order can emerge, without it being imposed by the government. We find strong evidence in favour of the emergence of Spontaneous Order, with communication being an important factor. Using text classification algorithms (Multinomial Naive Bayes) we quantitatively analyse the available chat data and we provide insight into the kind of communication that fosters specialisation in the absence of external involvement. We note that, while communication has been shown to foster coordination in other contexts (for example, in public goods games, market entry games and competitive coordination games) this contribution is in the context of a production game where specialisation is crucial.
Separation of hyperfine interactions in Mössbauer spectrocsopy
Authors: Szymański Krzysztof R. 
Published: December 2019

AbstractProblem of determination of isomer shift, all components of the electric field gradient and hyperfine magnetic field in case of mixed hyperfine interactions is presented. Orientation of hyperfine fields in the absorber Cartesian frame can be determined by few measurements with use of unpolarized radiation under different directions of wave vector with respect to the absorber. The method can be applied for absorbers with well separated absorption lines in their spectra. Explicit formulas for tensor components of hyperfine interactions derived from velocity moments formalism are presented.
What is Parent Engagement in Early Learning? Depends Who You Ask
Authors: Gross Deborah , Bettencourt Amie F. , Taylor Kathryn , Francis Lucine , Bower Kelly , Singleton Demetria L. 
Published: December 2019

AbstractObjectivesParent engagement in early learning has historically been defined quite broadly and it is unclear whether those designing, implementing, evaluating, or participating in parent engagement initiatives conceptualize parent engagement in the same way. Lack of consensus could contribute to poor quality of parent-school partnerships and reliance on parent engagement measures and strategies that lack meaning and utility. We explored and compared definitions and characteristics of parent engagement in early learning across multiple stakeholders in one urban school district serving predominantly low-income, African American, and Latinx families.MethodsUsing a qualitative descriptive design, we individually interviewed 63 parents (n = 23), teachers (n = 8), early childhood staff (n = 8), district leaders (n = 7), and community leaders (n = 8) to understand how each defined parent engagement in early learning and the characteristics they believed were indicative of an engaged parent.ResultsNine different definitions were described; the majority centering on parents’ responsibilities for ensuring engagement. We found wide differences within and across stakeholder groups in how parent engagement is defined and operationalized.ConclusionsThere was little consensus in how parent engagement was conceptualized, suggesting there may be different working models for how stakeholders believe parent engagement supports early learning. Three potential parent engagement models are discussed in relation to the qualitative findings. This is the first study to directly compare different stakeholders’ perspectives about parent engagement in early learning in an urban school system serving a large number of low income families and families of color.
On Minimal Copulas under the Concordance Order
Authors: Ahn Jae Youn , Fuchs Sebastian 
Published: December 2019

AbstractIn the present paper, we study extreme negative dependence focussing on the concordance order for copulas. With the absence of a least element for dimensions $$d\ge 3$$d≥3, the set of all minimal elements in the collection of all copulas turns out to be a natural and quite important extreme negative dependence concept. We investigate several sufficient conditions, and we provide a necessary condition for a copula to be minimal. The sufficient conditions are related to the extreme negative dependence concept of d-countermonotonicity and the necessary condition is related to the collection of all copulas minimizing multivariate Kendall’s tau. The concept of minimal copulas has already been proved to be useful in various continuous and concordance order preserving optimization problems including variance minimization and the detection of lower bounds for certain measures of concordance. We substantiate this key role of minimal copulas by showing that every continuous and concordance order preserving functional on copulas is minimized by some minimal copula, and, in the case the continuous functional is even strictly concordance order preserving, it is minimized by minimal copulas only. Applying the above results, we may conclude that every minimizer of Spearman’s rho is also a minimizer of Kendall’s tau.
Diagnosis, treatment and follow-up of patients with acromegaly in a clinical practice setting in Spain: the ACROPRAXIS program Delphi survey
Authors: de Pablos-Velasco Pedro , Venegas Eva María , Álvarez Escolá Cristina , Fajardo Carmen , de Miguel Paz , González Natividad , Bernabéu Ignacio , Valdés Nuria , Paja Miguel , Díez Juan José , Biagetti Betina 
Published: December 2019

Abstract
Aim
The ACROPRAXIS program aims to describe the management of acromegaly in Spain and provide guidance.

Methods
Ninety-three endocrinologists were organized into 13 panels to discuss the practical issues in managing acromegaly. Based on the key learnings, an online Delphi survey with 62 statements was performed, so those statements achieving consensus could be used as guidance. Statements were rated on a 9-point scale (9, full agreement; consensus > 66.6% of response in the same tertile).

Results
Ninety-two endocrinologists (98.8%) answered two rounds of the survey (mean age 47.6 years; 59.8% women; median 18.5 years of experience). Consensus was achieved for 49 (79%) statements. Diagnosis: The levels of insulin-like growth factor I (IGFI) is the preferred screening test. If IGFI levels 1–1.3 ULN, the test is repeated and growth hormone (GH) after oral glucose tolerance test (OGTT) is assessed. A pituitary magnetic resonance is performed after biochemical diagnosis. Treatment: Surgery is the first treatment choice for patients with microadenoma or macroadenoma with/without optical pathway compression. Pre-surgical somatostatin analogues (SSA) are indicated when surgery is delayed and/or to reduce anaesthesia-associated risks. After unsuccessful surgery, reintervention is performed if the residual tumor is resectable, while if non-resectable, SSA are administered. Follow-up First biochemical and clinical controls are performed 1–3 months after surgery. Disease remission is considered if random GH levels are < 1 µg/L or OGTT is < 1 or ≤ 0.4 µg/L, depending on the assay’s sensitivity.

Conclusion
Current clinical management for acromegaly is homogeneous across Spain and generally follows clinical guidelines.
Simulation of the forming process for curved composite sandwich panels
Authors: Chen S. , McGregor O. P. L. , Endruweit A. , Harper L. T. , Warrior N. A. 
Published: December 2019

AbstractFor affordable high-volume manufacture of sandwich panels with complex curvature and varying thickness, fabric skins and a core structure are simultaneously press-formed using a set of matched tools. A finite-element-based process simulation was developed, which takes into account shearing of the reinforcement skins, multi-axial deformation of the core structure, and friction at the interfaces. Meso-scale sandwich models, based on measured properties of the honeycomb cell walls, indicate that panels deform primarily in bending if out-of-plane movement of the core is unconstrained, while local through-thickness crushing of the core is more important in the presence of stronger constraints. As computational costs for meso-scale models are high, a complementary macro-scale model was developed for simulation of larger components. This is based on experimentally determined homogenised properties of the honeycomb core. The macro-scale model was employed to analyse forming of a generic component. Simulations predicted the poor localised conformity of the sandwich to the tool, as observed on a physical component. It was also predicted accurately that fibre shear angles in the skins are below the critical angle for onset of fabric wrinkling.