bluuebunny/crossref_metadata_2025_split huggingface dataset:
DESIGN AND DEVELOPMENT OF A 70 N THRUST CLASS TURBOJET ENGINE
Authors: Trazzi P. E. 
Published: November 2018

Small turbojet engines are being used for propulsion of radio-controlled model airplanes. The design and development of the model 505 small jet engine are reviewed. Small size gas turbines present special design and construction difficulties, some of which are addressed; design choices leading to the final configuration are discussed. Aero-thermodynamic aspects are covered along with experimental data when available. The unit is comprised of a radial compressor, an annular combustion chamber, and an axial turbine plus accessories; details on these components and on production aspects are presented.
EXPERIMENTAL VALIDATION OF A CAPPILARY TUBE SIMULATION MODEL WITH REFRIGERANT MIXTURES FLOW
Authors: Fiorelli F. A. S. , Silvares O. M. 
Published: November 2018

This paper presents the experimental validation of a simulation model for refrigerant mixtures flow through capillary tubes. To perform such validation it was built an experimental apparatus using a blow-down process. It was carried out preliminary tests for characterization of experimental parameters: actual capillary tube diameters; relative roughness; and the heat losses in subcooling/quality control system. It was obtained almost 200 experimental points for R-407C (a zeotropic mixture) and R-410A (a near azeotropic mixture). Complete data set for each point consists of the measured pressure and temperature profiles, mass flow rate and mixture composition, as well as subcooling/quality control system inlet and outlet temperatures and heater electric power consumption for tests with two-phase flow capillary tube inlet conditions. Comparison of simulation and experimental data show a good agreement. Main deviations are connected with the delay of vaporization phenomenon occurrence, experimentally verified by the authors.
MIXED GAS-OIL SUBSEA PIPELINES IN OFFSHORE TECHNOLOGY: TECHNICAL AND ECONOMIC ASPECTS
Authors: Caputo A. C. , Pelagagge P. M. , Ponticiello I. 
Published: November 2018

The choice of gas separation and transportation mode in offshore applications may significantly affect the project profitability. Main alternatives are separation on board the platform with the utilization of separate subsea pipeline for single-phase gas and oil transportation, and remote separation with multiphase transportation of the gas-oil mixture in a single pipeline. In order to assist the project engineers during the feasibility study phase, the problems relevant technical and economic issues are analysed in this paper after preliminarily describing the two process schemes. In particular a computer model is developed in order to simulate the two-phase flow of the multi-component mixture adopting the Beggs and Brill model, which showed to be the most reliable approach in this application. A cost comparison with reference to a hypothetical but realistic case study is finally carried out to assess the convenience of the multiphase flow solution. This option appears to be especially attractive when multiplewell fields exist which can be developed in an integrated manner by providing a single centralized separation plant. A Allowance for additional mass (t) L Liquid production (m3/day x 1000) STP Standard Temperature and Pressure
EXPERIMENTAL ANALYSIS OF A HEAT PUMP ASSISTED RECUPERATIVE AIR DEHUMIDIFIER
Authors: Pereira C. A. B. , Pereira R. H. , Marques R. P. , Parise J. A. R. , Sodré J.R. 
Published: November 2018

This paper describes the experimental analysis of a heat pump assisted recuperative air dehumidifier. The system consisted of an air-to-air vapor compression heat pump, coupled to the air ducting. Dehumidification was generated by reduction of the air temperature through the evaporator below the dew point, and thus promoting the condensation of the water vapor. Moist air was then warmed up in the condenser, resulting in a lowtemperature low-humidity air stream. Low energy consumption values are achieved in such systems as the latent heat of the water vapor acts as the heat pump own heat source. Occasionally, the compressor heat is also recoverable. The innovative feature of the present analysis was the introduction of an air-to-air plate recuperator, to further promote dehumidification, yet at the expense of greater compressor energy consumption. An experimental apparatus was constructed to perform comparative tests of the dehumidifier operating with and without the recuperator. A closed air circuit was employed, with the air mass flow rate as the controlling parameter of the experiment. Tests were also carried out with an open circuit.
Histoire militaire et politique étrangère : les fondements de la reconstruction néoconservatrice du nationalisme canadien
Authors: Dorion-Soulié Manuel , Massie Justin , Vézina Valérie 
Published: November 2018

De 2006 à 2015, Stephen Harper a cherché à redéfinir l’identité canadienne en remplaçant le nationalisme libéral par un nationalisme néoconservateur. S’inspirant des « études du nationalisme », cet article propose trois conditions nécessaires à l’émergence d’un nouveau nationalisme : sentiment d’exclusion sociopolitique ; mobilisation politique de ce sentiment ; redécouverte et réinterprétation de l’histoire nationale. L’article explore cette dernière condition, soulignant l’importance de la politique étrangère et de l’histoire militaire dans la reconstruction du nationalisme canadien par le Parti conservateur sous Harper. L’analyse des travaux de Jack Granatstein montre que celui-ci a contribué à « redécouvrir » un passé national dont le projet identitaire néoconservateur s’est inspiré.
Comment faire communauté autrement au sein de l’État anglodominant canadien ? Le cas des Fransaskois
Authors: Dubois1 Janique 
Published: November 2018

Éparpillés sur un vaste territoire majoritairement anglophone, les Fransaskois partagent un désir de « faire communauté », c’est-à-dire de vivre une vie pleine en français aux côtés de leurs voisins anglophones. Comment cette « petite » communauté envisage-t-elle de faire communauté au sein de l’État anglodominant canadien ? À partir d’une analyse qualitative de discours, ce texte cherche à définir les aspirations politiques des Fransaskois. L’analyse révèle une volonté persistante de renverser le rapport de domination entre la communauté fransaskoise et l’État. Le désir des Fransaskois d’exercer un contrôle sur leur destinée s’exprime non seulement par la réorientation des revendications politiques de leurs leaders, mais aussi par la restructuration périodique de leurs structures et processus de gouvernance.
L’apprentissage et la pratique de l’écriture scientifique aux études supérieures
Authors: Benoit Maude 
Published: November 2018

Qui n’a pas déjà entendu l’expression « une bonne thèse est une thèse finie » ? La popularité de cette formule tient probablement au fait qu’elle résume en peu de mots le constat qu’il ne suffit pas d’avoir des réflexions intéressantes pour réussir un mémoire ou une thèse, mais qu’il faut surtout être capable de coucher sur papier ses idées pour mener à terme son projet. Or, nombreux sont les étudiant·e·s qui rencontrent des difficultés au moment d’écrire. Ce court article explore les défis que pose l’apprentissage de la rédaction aux cycles supérieurs et propose des solutions pratiques pour surmonter la procrastination et le syndrome de la page blanche, mais surtout pour encourager les étudiant·e·s à devenir des écrivain·e·s qui réussiront à mettre un point final à leur manuscrit.
Exploring Students' Level of Conceptual Understanding on Periodicity
Authors: Necor Dexter 
Published: November 2018

Nowadays, many science studies motivated on addressing the conceptual understanding particularly in chemistry that soon may affect students' academic performance. This study covered the level of conceptual understanding on the trends of the periodic table of elements and the type of conceptual change before and after the exposure of interventions. The qualitative and quantitative research method were used in the study. Respondents were Grade 10 high school students. Frequency, percentage, and t-test were the statistical tools applied to answer specific questions. Results revealed that most students have an ambiguous conceptual understanding. The trends in ionization energy (I.E.) noted the highest misconception statements followed by the trends in atomic radius (A.R.). The trends in electron affinity (E.A.); formation of cation and anion (I.R.); and electronegativity (E.) were also least understood by the students. After interventions, there is a marked increase in students who progressed from misconception (MU) to full understanding (FU). This is prevalent on the trends in atomic radius, followed by the trends in electron affinity and the formation of ions. The use of varied activities such as visualizing and multimedia tools; small-group discussions; and concept mapping have a vital positive outcome in their progression. Ergo, science teachers should vary their teaching strategies to address and correct students' conceptual obstacles in learning chemistry concepts.
Single Crystal Growth of the High Temperature Superconducting Cuprates
Authors: Erb Andreas 
Published: November 2018

Abstract
The excitement of finding compounds with critical temperatures above the boiling point of liquid nitrogen triggered unprecedented research activities and an enormous number of publications. However, progress in understanding the physical properties of the cuprate high‐temperature superconductors was intimately connected with the progress achieved in single crystal growth over more than 20 years of their existence. In fact, many of the experimental findings from the early days of research into cuprate superconductors have in turn to be revisited due to inadequate crystal quality in the early period of crystal preparation.
Practical Design of High‐Temperature Superconducting Current Leads
Authors: Demko Jonathan A. 
Published: November 2018

The article contains sections titled:IntroductionCryogenic Copper PropertiesThermally Optimized Current Lead in a VacuumNonoptimal OperationVapor‐ or Forced Flow‐Cooled Current LeadsRefrigeration RequirementsShort‐Duration Overcurrent Heating
Calibration strategies for use of the nanoDot OSLD in CT applications
Authors: Scarboro Sarah B. , Cody Dianna , Stingo Francesco C. , Alvarez Paola , Followill David , Court Laurence , Zhang Di , McNitt‐Gray Michael , Kry Stephen F. 
Published: November 2018

AbstractAluminum oxide based optically stimulated luminescent dosimeters (OSLD) have been recognized as a useful dosimeter for measuring CT dose, particularly for patient dose measurements. Despite the increasing use of this dosimeter, appropriate dosimeter calibration techniques have not been established in the literature; while the manufacturer offers a calibration procedure, it is known to have relatively large uncertainties. The purpose of this work was to evaluate two clinical approaches for calibrating these dosimeters for CT applications, and to determine the uncertainty associated with measurements using these techniques. Three unique calibration procedures were used to calculate dose for a range of CT conditions using a commercially available OSLD and reader. The three calibration procedures included calibration (a) using the vendor‐provided method, (b) relative to a 120 kVp CT spectrum in air, and (c) relative to a megavoltage beam (implemented with 60Co). The dose measured using each of these approaches was compared to dose measured using a calibrated farmer‐type ion chamber. Finally, the uncertainty in the dose measured using each approach was determined. For the CT and megavoltage calibration methods, the dose measured using the OSLD nanoDot was within 5% of the dose measured using an ion chamber for a wide range of different CT scan parameters (80–140 kVp, and with measurements at a range of positions). When calibrated using the vendor‐recommended protocol, the OSLD measured doses were on average 15.5% lower than ion chamber doses. Two clinical calibration techniques have been evaluated and are presented in this work as alternatives to the vendor‐provided calibration approach. These techniques provide high precision for OSLD‐based measurements in a CT environment.
Observer‐based adaptive optimal output containment control problem of linear heterogeneous Multiagent systems with relative output measurements
Authors: Mazouchi Majid , Naghibi‐Sistani Mohammad Bagher , Hosseini Sani Seyed Kamal , Tatari Farzaneh , Modares Hamidreza 
Published: November 2018

SummaryThis paper develops a relative output‐feedback–based solution to the containment control of linear heterogeneous multiagent systems. A distributed optimal control protocol is presented for the followers to not only assure that their outputs fall into the convex hull of the leaders' output but also optimizes their transient performance. The proposed optimal solution is composed of a feedback part, depending of the followers' state, and a feed‐forward part, depending on the convex hull of the leaders' state. To comply with most real‐world applications, the feedback and feed‐forward states are assumed to be unavailable and are estimated using two distributed observers. That is, a distributed observer is designed to measure each agent's states using only its relative output measurements and the information that it receives by its neighbors. Another adaptive distributed observer is designed, which uses exchange of information between followers over a communication network to estimate the convex hull of the leaders' state. The proposed observer relaxes the restrictive requirement of having access to the complete knowledge of the leaders' dynamics by all the followers. An off‐policy reinforcement learning algorithm on an actor‐critic structure is next developed to solve the optimal containment control problem online, using relative output measurements and without requiring the leaders' dynamics. Finally, the theoretical results are verified by numerical simulations.
Ionic Modulation of Interfacial Magnetism in Light Metal/Ferromagnetic Insulator Layered Nanostructures
Authors: Guan Mengmeng , Wang Lei , Zhao Shishun , Peng Bin , Su Wei , He Zhexi , Dong Guohua , Min Tai , Ma Jing , Hu Zhongqiang , Ren Wei , Ye Zuo‐Guang , Nan Ce‐Wen , Zhou Ziyao , Liu Ming 
Published: November 2018

AbstractFerromagnetic insulator thin film nanostructures are becoming the key component of the state‐of‐the‐art spintronic devices, for instance, yttrium iron garnet (YIG) with low damping, high Curie temperature, and high resistivity is explored into many spin–orbit interactions related spintronic devices. Voltage modulation of YIG, with great practical/theoretical significance, thus can be widely applied in various YIG‐based spintronics effects. Nevertheless, to manipulate ferromagnetism of YIG through electric field (E‐field), instead of current, in an energy efficient manner is essentially challenging. Here, a YIG/Cu/Pt layered nanostructure with a weak spin–orbit coupling interaction is fabricated, and then the interfacial magnetism of the Cu and YIG is modified via ionic liquid gating method significantly. A record‐high E‐field‐induced ferromagnetic resonance field shift of 1400 Oe is achieved in YIG (17 nm)/Cu (5 nm)/Pt (3 nm)/ionic liquid/Au capacitor layered nanostructures with a small voltage bias of 4.5 V. The giant magnetoelectric tunability comes from voltage‐induced extra ferromagnetic ordering in Cu layer, confirmed by the first‐principle calculation. This E‐field modulation of interfacial magnetism between light metal and magnetic isolator may open a door toward compact, high‐performance, and energy‐efficient spintronic devices.
Controllable Synthesis of Nanosized Amorphous MoSx Using Temporally Shaped Femtosecond Laser for Highly Efficient Electrochemical Hydrogen Production
Authors: Li Bo , Jiang Lan , Li Xin , Cheng Zhihua , Ran Peng , Zuo Pei , Qu Liangti , Zhang Jiatao , Lu Yongfeng 
Published: November 2018

AbstractAmorphous molybdenum sulfide (a‐MoSx) is regarded as a promising electrocatalyst for hydrogen evolution reaction (HER) due to its disorder structures with a significant number of defect‐rich active sites. Here, a green, one‐step, and controllable method is developed to photoregulate the chemical reactions and synthesize nanosized a‐MoSx by temporally shaped femtosecond laser ablation of ammonium tetrathiomolybdate aqueous solution. By adjusting the laser energy and pulse delay to control photoinduced and/or photothermal‐induced reduction/oxidation, the S to Mo ratio x can be modulated from 1.53 to 3.07 and the ratio of the MoV defect species, bridging S22−, and terminal S22− ligands can be controlled. The optimized a‐MoSx catalysts (x = 2.73) exhibit high catalytic activity with a low Tafel slope of 40 mV dec−1, high double‐layer capacitance of 74.47 mF cm−2, and large current density of 516 mA cm−2 at an overpotential of 250 mV. The high catalytic activity can be mainly attributed to MoV defect species and bridging S22− ligands, or most likely dominated by the MoV defect species. This study not only provides an alternatively controllable method to prepare a‐MoSx as efficient HER catalysts but also contributes to the understanding of the origin of its catalytic activity.
High‐Efficiency Low‐Resistance Oil‐Mist Coalescence Filtration Using Fibrous Filters with Thickness‐Direction Asymmetric Wettability
Authors: Wei Xin , Zhou Hua , Chen Feng , Wang Hongxia , Ji Zhongli , Lin Tong 
Published: November 2018

AbstractConventional aerosol filters typically have homogeneous wettability with limited filtration ability especially for small oil mists. Increasing filtration efficiency using thicker filter pad or finer fibers both result in considerable increase of pressure drop, which adversely increases energy consumption. It remains a challenge to develop effective filter materials that can effectively remove oil mists from air at a low flow resistance. Here, a novel concept about improving oil mist filtration efficiency without apparently increasing pressure drop using a fibrous filter with asymmetric wettability across the thickness is demonstrated. Dip‐coating and single‐side electrospraying are used to make fibrous filter have a homogeneous superoleophobicity or directional oil‐transport function. When the two are combined together, they show a filtration efficiency as high as 99.45% for small oil mists (size 0.01–0.8 µm) and nearly 100% for large oil mists (size 0.5–20 µm) with a pressure drop of 9.29 kPa. With the same thickness and fibrous structure, our directional oil‐transport/superoleophobic filter has higher quality factor than those with homogeneous oleophilic, superoleophobic, and asymmetric wettability of other superoleophilic/superoleophobic combinations, for both small and large oil mists. Directional oil transport‐superoleophobic filters may lead to a novel, high‐performance, low energy consumption oil mist separation technology.
An Ultrathin Ferroelectric Perovskite Oxide Layer for High‐Performance Hole Transport Material Free Carbon Based Halide Perovskite Solar Cells
Authors: Yang Yinglong , Liu Zhenghao , Ng Wai Kit , Zhang Lihua , Zhang Hua , Meng Xiangyue , Bai Yang , Xiao Shuang , Zhang Teng , Hu Chen , Wong Kam Sing , Yang Shihe 
Published: November 2018

AbstractThe hole transport material (HTM) free carbon based perovskite solar cells (C‐PSCs) are promising for its manufactural simplicity, but they currently suffer from low power conversion efficiencies (PCE) largely because of the voltage loss. Here, a new strategy to increase the PCE by incorporating an ultrathin ferroelectric oxide PbTiO3 layer between the electron transport material and the halide perovskite is reported. The resulting C‐PSCs have achieved PCEs up to 16.37%, which is the highest record for HTM‐free C‐PSCs to date, mainly ascribable to the ferroelectric layer enhanced open circuit voltage. Detail measurements and analysis show an enhanced built‐in potential in the C‐PSCs as well as suppression of the non‐radiative recombination due to the ferroelectric PbTiO3 layer incorporation, accounting for the boosted VOC and photovoltaic performance.
Rhodium‐Catalyzed Cascade Annulation Reaction via C−H Activation of Azobenzenes with Terminal Alkynes: A Synthesis of Indolo[1,2‐b]cinnolines
Authors: Zhang Shuwei , Wang Biying , Jia Xiaodong , Yuan Yu 
Published: November 2018

AbstractThe approach for direct synthesis of Indolo[1,2‐b]cinnolines was first developed from azobenzenes and terminal alkynes by rhodium‐catalyzed cascade annulation reaction. In this reaction, the C−C and C−N bonds can be simultaneously constructed via C−H activation to afford the desired products in moderate to good yields.magnified image
Graphitic Nitrogen and High‐Crystalline Triggered Strong Photoluminescence and Room‐Temperature Ferromagnetism in Carbonized Polymer Dots
Authors: Lu Siyu , Sui Laizhi , Wu Min , Zhu Shoujun , Yong Xue , Yang Bai 
Published: November 2018

AbstractCarbonized polymer dots (CPDs) have great potential for bioimaging and biosensing owing to their low toxicity, low cost, resistance to photobleaching, and low environmental impact. Here, the hydrothermal condensation of biomolecules (l‐serine and l‐tryptophan) is used to vary the CPDs' inner structure from amorphous to lattice. A new type of carbon lattice CPD is thus demonstrated that is bright (the photoluminescence quantum yield (PLQY) is as high as 89.57%) and shows room‐temperature ferromagnetism (RTFM), with the magnetic moment increasing from 0.0025 emu g−1 in crosslinked polymer clusters to 0.021 emu g−1 in the latticed sample. Hydrothermal synthesis at 300 °C leads to a distinct type of CPD with an obvious carbon lattice, which shows the highest PLQY and the greatest ferromagnetism. Then, the origin of the RTFM is examined in the CPDs via first‐principles calculation, revealing that graphitic nitrogen triggers RTFM in CPDs. Moreover, a possible growth mechanism is suggested that includes kinetics as an important factor in the formation of the CPD crystallites. Overall, these findings identify graphitic nitrogen and high crystallinity as crucial to the enhancement of the CPDs' photoluminescence and room‐temperature ferromagnetism which suggests that they deserve more research attention to develop practical applications.