bluuebunny/crossref_metadata_2025 huggingface dataset:
Basics of the approach formation to substantiate the temperature field distribution during experimental research on the coal gasification processes
Authors: Saik Pavlo , Lozynskyi Vasyl , Chemeriachko Yurii , Cabana Edgar
Published: October 2020

This paper studies the problems related to the research on the temperature conditions during the coal seam gasification. In particular, while maintaining the identity of the “model – nature” system. A review of the specific application of thermal imaging equipment and thermoelectric transducers (thermocouples) is given. Approaches to the research into the gasification modes using thermocouples on a laboratory setup are described and the main disadvantages of their application are revealed. The dependences have been obtained of the change in the temperature field depending on the gasification modes (ignition process, reverse operations, gasification mode). Recommendations have been developed on the possibility of using thermal imaging equipment (thermal imagers) when studying the temperature field of the gasification process in laboratory conditions.
Development of methods for assessing the mine workings stability
Authors: Abdiev Arstanbek , Mambetova Rakhat , Abdiev Aziz , Abdiev Sher
Published: October 2020

This paper studies the rock mass stress state under highland conditions, depending on the geological structure of a particular rock mass area, the tectonic field of stresses and the region relief. This study is aimed to develop an experimental method for assessing and monitoring the properties and state of the rock mass adjacent to mine workings. Experimental studies are performed through stresses measurements in-situ. Based on research results, it has been revealed that the geological structures, tectonic fields of stresses and the earth’s surface relief of the deposit normally reflect the values and direction of the main stresses acting in the mass. These patterns can be used to predict and assess the stress state of the rock mass. During the mass stress state assessment, quantitative dependences have been obtained for determining the stress tensors conditioned by the overlying rocks weight, tectonics and fracturing, and the deposit surface relief The research results make possible to assess the nature of the stresses distribution, to identify the areas of reduced, equal, increased and maximum stresses concentration of the virgin mass, as well as to increase the efficiency of the geoacoustic control developed by the authors for the state of the mass adjacent to mine working. According to the new patterns and dependences obtained, the values and directions have been scientifically determined of the main stresses action, as well as the zones of stresses manifestation. These patterns and dependences are valuable for designing and planning the development of mining operations.
Development of spicy flavored virgin coconut oil by incorporating a mixture of spices oleoresins
Authors: Perera Dilini N. , Ranaweera K.K.D.S. , Marapana R.A.U.J. , Hewavitharana Geeth G.
Published: October 2020

Lipid oxidation is a major cause of deterioration in the quality of cooking oils. Degradation of unsaturated fatty acids in oils directly leads to changes in nutritional value, flavor, and storage properties. Oleoresins of ginger, garlic, nutmeg, pepper, cloves, and cinnamon were extracted and incorporated into virgin coconut oil (VCO) to overcome adverse effects of lipid oxidation and changes occurrence on physicochemical properties, thermal stability, shelf life, antioxidant activity, total phenolics and sensory evaluation were conducted against same properties of VCO. Lipid oxidation was assessed in terms of free fatty acid (FFA) value and peroxide value (PV). For the comparison purpose, another oil sample was prepared by incorporating vitamin E too. Results revealed that both PV and FFA of VCO and spicy flavored oil (SFO) samples after one-week storage period were 1.93 ± 0.01 and 1.62 ± 0.02 mEq/kg and 0.36 ± 0.01 and 0.24 ± 0.01 (%) respectively. Saponification value (SV), iodine value (IV), smoke point, flashpoint, viscosity, and the specific gravity of SFO were increased and there was no significant difference in moisture content and insoluble impurities in SFO and VCO. The highest phenolic content and DPPH free radical scavenging activity were found in SFO. The thermal stability of SFO was better than VCO. Both oleoresins and vitamin E incorporated samples showed the same pattern of increment of FFA and PV during storage; however, those increments were slower than VCO. SFO was highly accepted by the sensory panelists in terms of color, aroma, taste, texture, and overall acceptability.
Impliquer des patients dans la révision d’un curriculum de formation en médecine : une étude mixte sur l’intégration d’une perspective d’éthique clinique
Authors: Flora Luigi , Karazivan Philippe , Dumais-Lévesque Guillaume , Berkesse Alexandre , Dumez Vincent , Janvier Annie , Gagnon Robert , Payot Antoine
Published: October 2020

Contexte : Le curriculum de médecine de la Faculté de médecine de l’Université de Montréal connait plusieurs mutations majeures, dont l’adoption d’une nouvelle approche relationnelle dite de partenariat avec le patient et ses proches. L’approche repose sur le postulat du patient considéré comme acteur en possession d’un savoir important pour la formation des médecins. En conséquence, la présente recherche exploratoire décrit la révision des vignettes cliniques des dossiers d’apprentissage par problèmes qui parcourent tout au long du premier cycle de la formation médicale. But : Cette recherche présente le processus de révision d’une partie du curriculum du programme de premier cycle en médecine (programme MD) intégrant des patients formateurs, des étudiants en médecine à une équipe interdisciplinaire en sciences de la santé et de sciences humaines et sociales. Méthodes : Une méthode mixte a été employée mobilisant 24 répondants appartenant à cinq groupes différents (étudiants de médecine, patients, éthiciens, spécialistes des sciences sociales, professeurs de médecine). Ils ont répondu à un questionnaire comprenant des questions à réponse chiffrées et des espaces pour commentaires écrits. Les distributions des scores des cinq groupes ont été comparées à l’aide du test non-paramétrique de Mann–Whitney. Les commentaires des répondants ont fait l’objet d’une analyse qualitative thématique. Résultats : Les cinq groupes soulignent l’importance de ne pas discriminer ou stéréotyper les groupes sur la base de leur origine culturelle. Les professeurs expriment majoritairement la nécessité d’investir plusieurs heures de travail supplémentaire pour s’approprier le nouveau contenu. Les spécialistes en sciences sociales font référence à la nécessité d’une approche systémique pour la formation médicale. Les patients abordent la transmission des connaissances expérientielles et les étudiants sont peu critiques et cherchent des réponses claires, concrètes, clairement explicitées. Les résultats des analyses statistiques ne sont pas significatifs. Conclusion : La recherche a permis de mettre en évidence la valeur ajoutée de l’implication de chacun des groupes dans un processus de révision d’une partie du curriculum. La contribution des patients a démontré une valeur ajoutée particulière en proposant une vision et une sensibilisation à la complexité des situations cliniques et au vécu expérientiel de la maladie et de la vie avec la maladie.
Impact of prior treatment on feasibility and outcomes of Zenker’s peroral endoscopic myotomy (Z-POEM)
Authors: Sanaei Omid , Ichkhanian Yervant , Mondragón Oscar V. Hernández , Nieto Jose , Krishnan Arunkumar , Tantau Marcel , Tantau Alina , Desai Pankaj N. , Ginsberg Gregory G. , Saumoy Monica , Deshmukh Ameya , Attaar Mikhail , Farha Jad , Jovani Manol , Al-Ghamdi Sarah S. , Ujiki Michael , Khashab Mouen A.
Published: October 2020

Background Zenker’s peroral endoscopic myotomy (Z-POEM) is a novel procedure for the management of symptomatic Zenker’s diverticulum. This study aims to report the technical feasibility and outcomes of Z-POEM in the management of Zenker’s diverticulum after prior failed interventions.

Methods Patients with persistent or recurrent symptoms after prior endoscopic and/or surgical intervention for Zenker’s diverticulum were retrospectively included. The primary outcome was clinical success, defined as complete or near complete resolution of dysphagia (dysphagia score of 0 or 1) without the need for repeat endoscopic or surgical intervention during follow-up.

Results Z-POEM was technically successful in 30/32 patients (93.8 %). Clinical success was achieved in 29/30 patients (96.7 %), and Z-POEM significantly reduced the median (interquartile range [IQR]) dysphagia score of patients from 2 (1 – 2) to 0 (0) (P < 0.001) over a median duration of follow up of 166 days (IQR 39 – 566). Four patients (12.5 %) had adverse events (two inadvertent mucosotomies and two leaks found on post-procedural esophagrams).

Conclusion Z-POEM is feasible, safe, and effective in the majority of patients with recurrent symptoms after prior surgical or endoscopic interventions.
Mid-Carpal Joint Sparing Procedure for Idiopathic Avascular Necrosis of Capitate
Authors: Ansari Mohammed Tahir , Janardhanan Ritvik
Published: October 2020

Background Avascular necrosis of the capitate (AVNC) is an uncommon pathology of the wrist. Several procedures have been described for the treatment of AVNC. The type of treatment varies depending upon the stages. In early stages, revascularization procedures are performed. If secondary osteoarthritis develops, then the treatment options include intercarpal fusion, four corner fusion, prosthesis replacement of the capitate, tendon interposition, and wrist arthrodesis. No long-term study is available for choosing an appropriate method of the treatment for AVNC.

Case Description Herein, we report a case of AVNC that was managed by hemi-resection of the capitate with capito-hamate fusion and tendon interposition. One year after surgery, patient was asymptomatic and radiographs revealed fusion of capito-hamate joint and maintenance of the mid-carpal joint space. There was no evidence of carpal collapse.

Literature Review All the literature about mid-carpal joint sparing (MCJS) procedures has been reviewed in this report. This is a goal behind writing of this case report as there have been very few publications about these procedures.

Clinical Relevance This case illustrates the successful treatment of AVNC by MCJS procedure. The intercarpal fusion and the four corner fusion are one time procedures, and these can be used if the MCJS procedure fails or sometimes, as primary procedure, if the patient gives consent for the same. It appears prudent to save arthrodesis procedures for the future.
The many versions of the painting of Tingqua’s studio: painting copying and originality in nineteenth-century canton
Authors: Yaron Elad
Published: October 2020

Personal expression was generally not part of the job requirements of trade-painters in nineteenth-century Canton, China. They were asked to produce paintings tailored to their Western consumers’ interests, wishes, and needs. Yet, in the middle of this “art-world” lies an enigma: a set of thirteen paintings depicting the workshop of the trade-painter Tingqua, which seem, at first glance, to be duplicates of a mundane product of the industry. Closer examination, however, reveals not only that each of these versions is unique, but also that the series as a whole is actually extraordinary. The workshop paintings are full of details, including various quotes written in calligraphy, which would not have been understood either by Western or even by most Chinese viewers, but only by members of the scholar-gentry, that is, the literati of China. The main question we face before this thirteen-piece puzzle is: why did the artist plant messages or integrate codes in paintings that were sent to a world in which nobody could decode them? I propose that these workshop paintings be read as a self-portrait of a person living in a world that is witnessing a contest between two substantially different momentous cultures, each struggling to prove its superiority or dominance. Watching the demise of an old world to which he himself was contributing, Tingqua decided to treasure some of its features despite knowing that those who purchased the works would not be able to appreciate them.
Finite element analysis and research on the influence law of two-cell photoacoustic spectroscopy parameters
Authors: Zhao A. Rongrong , Yang B. Peng , Han C. Jianning
Published: October 2020

In order to analyze the characteristics of the photoacoustic signals of two identical cells at different distances, this paper conducted a finite element analysis on the influence of the parameters of the two-cell photoacoustic spectrum. The study established a two-cell model at different distances and a single cell model under the same peripheral environment. Using the two-cell model, we have obtained the frequency domain sound pressure level curves of the subject red blood cells at different angles under the influence of another cell at a different distance. In the single cell model, this paper obtains the frequency domain sound pressure level curves of a single cell at different angles when it is not affected. The frequency domain sound pressure level curve of each angle of the subject cell is compared with the frequency domain sound pressure level curve of a single cell at the same position. The results show that when the distance between the two cells is 26.6 µm, the frequency domain sound pressure level curve of the subject cell has the highest similarity with the frequency domain sound pressure level curve of a single cell. This study shows that when the distance between two cells is appropriate, the photoacoustic signals between the cells have the least influence on each other.
Jet deflection by two side-by-side arranged hydrofoils pitching in a quiescent fluid
Authors: Raj Kota Mukesh , Arumuru Venugopal
Published: October 2020

The present work reports a computational study on the pitching of two identical NACA 0012 airfoils arranged in a side-by-side (parallel) configuration in a still medium. Pitching of airfoils arranged in a side-by-side (parallel) configuration in a still medium leads to the formation of a deflected jet. The angle at which the jet is deflected depends on the oscillation phase difference between the airfoils and the frequency of oscillation. The deflection angle is high at a lower frequency of oscillation for a given phase difference between the foils. The time-averaged jet deflection angle, thrust, and lift on airfoils are quantified for a range of frequencies (0.5 Hz–2 Hz) and phase differences (0°–180°) between the airfoils. The thrust force increases gradually with an increase in the phase difference between the foils until 120°, and beyond this, it decreases. The maximum jet deflection angle is found to be 28° when the phase difference is 45° for a frequency of 0.5 Hz. It is observed that the initially deflected jet switches toward the centerline position after specific periods of pitching. This switching of the jet from a deflected position toward the centerline initiates once the vortices from the lower foil interact completely with the upper foil. Some of these findings are relatively new in the domain of bio locomotion, which is useful for various related engineering applications.
Borrowing from Bislama into Raga, Vanuatu
Authors: Duhamel Marie-France
Published: October 2020

This paper reports on variation among speakers of Raga, an Oceanic language of Pentecost island, Vanuatu, in their use of
borrowings from Bislama, the national language of Vanuatu, an English-lexifier contact language. The study measures the frequency of
borrowings from Bislama in the speech of 50 speakers, surveys speakers’ strategies in assimilating loanwords into Raga and quantifies
speakers’ rate of lexical replacement and insertion. This corpus of natural speech reveals an overall low incidence of borrowing from
Bislama at 1.6 Bislama words per 100 recorded words. Women and younger speakers borrow more frequently from Bislama. Young speakers use
borrowings in equal measure to add to their vocabulary and replace Raga words, while their elders tend to borrow from Bislama to add to
their vocabulary, rather than replace Raga words.
Word-initial [h]-drop variation in Nmbo
Authors: Kashima Eri
Published: October 2020

This paper presents a natural speech corpus-based study of word-initial [h]-drop from the Nmbo speech community of
southern Papua New Guinea. It is a speech community within a traditional egalitarian multilingual language ecology sustained by a practice
of virilocal exogamy, and there is strong intergenerational transmission of local vernacular languages. This study investigates the
propensity of word-initial [h]-drop in nouns, based on Nmbo speech data of Kerake tribe people. The results from the Nmbo Sociolinguistic
Corpus shows clear age-conditioned variation, with younger speakers showing a higher propensity for [h]-drop. Nmbo speakers residing both
within and outside their Nmbo villages of origin appear to be partaking in the innovative [h]-drop. The origin of the [h]-drop appears to be
from the village with a more multilingual profile, as would be predicted by the notion of a multilingual feature pool
(Cheshire, Kerswill, Fox, & Torgersen, 2011, Mufwene
2001).
Translating Qur’anic ‘X-phemisms’ Muslims live by
Authors: Hassanein Hamada
Published: October 2020

This study employs a pragmasemantic approach to investigate the challenges Qur’an translators encounter when rendering Qur’anic euphemisms of licit intercourse (X-phemisms) into English. To achieve the objectives of the study, two understudied translations have been selected for a contrastive analysis of source language X-phemisms and their target language renderings. The analysis reveals that Qur’anic X-phemisms do not lend themselves to an easy translation due to cultural and linguistic idiosyncrasies; they hold a variety of lexical-semantic relations, and branch out into three broad ramifications: procreation, protection, and pleasure. Several Qur’anic X-phemisms have undergone semantic change through meaning-related processes, including generalization, particularization, amelioration, pejoration, and opposition. Some linguistic mechanisms have been manipulated to create euphemistic substitutes for direct references to marital sex through periphrasis, collocation, and figuration, all of which flout the Cooperative Principle in favor of the Politeness Principle.
Translating code-switching in the colonial context
Authors: Choi Jinsil , Kim Kyung Hye , Evans Jonathan
Published: October 2020

Park Chan-wook, one of the most internationally acclaimed Korean filmmakers, uses language as an important aspect
of characterization in The Handmaiden, his adaptation of Sarah Water’s novel Fingersmith. The
historical background and the characters’ nationalities are changed, but code-switching between two languages – i.e., Korean and
Japanese – recurs throughout the film, thereby enhancing its relevance for the Korean audience. Drawing on the notion of
‘proximity’ and reader response theory, this study examines the role of languages in Park’s characterization and proximation of
the original work for the Korean audience, and the extent to which the shifts in proximity and the use of languages contribute to
British audiences’ affective experiences when this Korean adaptation is subtitled in English.
From Quasi-Vegetarians to Quasi-Carnivores: The Changing Diet of Iranians
Authors: Floor Willem
Published: October 2020

Until the twentieth century there was little change in the diet of Iranians. Bread was the major staple, accompanied by vegetables, fruits, yoghurt, and nuts. Meat and rice were a luxury food for most consumers. In the nineteenth and twentieth centuries new food items were adopted by Persian consumers. After 1970, the modern Iranian diet—large amounts of white rice, meats, sugar-sweetened beverages and sweet/deserts, with few vegetables, herbs, nuts or fruits—has grown increasingly similar to the US diet, with the same health problems.
Comment on ‘defining the electromagnetic potentials’
Authors: Heras José A
Published: October 2020

In his recent paper (2020 Eur. J. Phys.
41 045202), Davis makes the claim that potentials and fields are ill-defined in the conventional treatment of electromagnetism. He argues that ‘the usual treatment is ambiguous, with that ambiguity being reflected in the gauge transformation equations’. He then proposes an approach based on two operational versions of Helmholtz’s theorem and claims that his approach does not exhibit gauge freedom and allows a rigourous definition of electromagnetic potentials. Here I argue that Davis’s approach does not provide a more rigours definition of potentials than that provided by the standard approach. Apparently, Davis does not realize that when applying an operational version of Helmholtz’s theorem to Maxwell’s equations, he is not avoiding gauge invariance but tacitly applying it by choosing the particular gauge-condition related to this version of the theorem. The application of the instantaneous Helmholtz’s theorem to Maxwell’s equations is equivalent to the choice of the Coulomb-gauge condition, and the application of the retarded Helmholtz’s theorem to these equations is equivalent to the choice of the Lorentz-gauge condition.
Engineering ferromagnetic lines in graphene by local oxidation and hydrogenation using nanoscale lithography
Authors: Byun Ik-Su , Boukhvalov Danil W , Lee Sangik , Kim Wondong , Baik Jaeyoon , Shin Hyun-Joon , Lee Changhee , Son Young-Woo , Jia Quanxi , Park Bae Ho
Published: October 2020

Graphene-based spintronics has attracted much attention owing to the weak spin–orbit interaction and long spin relaxation length in graphene. For implementation of practical and high-density graphene-based spintronic devices, we need to define nanoscale areas with room-temperature ferromagnetism on graphene. Here we report the room-temperature ferromagnetism observed in nanoscale functionalized (oxidized and hydrogenated) graphene using atomic force microscope lithography without involving potential surface contamination and chemical agents. By performing magnetic force microscope (MFM) measurements, we can clearly distinguish the local ferromagnetic signal of selectively functionalized graphene from that of surrounding non-magnetic pristine graphene. The nanoscale functionalized graphene shows experimental evidence of room-temperature ferromagnetism: (1) larger MFM signal than that of graphene; (2) repulsive and attractive interaction with an MFM tip the magnetization of which points into and out of the graphene, respectively; and (3) MFM signal reversal after applying a high magnetic field at an elevated temperature of 400 K. Our first-principles calculations reveal that unpaired spins are present at non-passivated dangling bonds of vacancies on functionalized graphene and the stable ferromagnetic exchange interactions between them are favored. Therefore, nanoscale functionalized graphene is a good candidate for use as the spin injector or detector of high-density graphene-based spintronic devices.
High transfer coefficient niobium nano-SQUID integrated with a nanogap modulation flux line
Authors: Qing Zhong , Yuchien Tsai , Jinjin Li , Hao Ling , Kaili Jiang , Yuan Zhong , Wenhui Cao , Zhang Mingyu , Xueshen Wang
Published: October 2020

Nano-superconducting quantum interference devices (nano-SQUIDs) with high energy sensitivity and spatial resolution are essential in many applications such as single spin detection, nano-electromechanical vibration detection and microscale magnetic imaging. This paper studies a Dayem-type niobium nano-SQUID using focus ion beam milling technology. The device has two 42 nm × 60 nm nano-bridges and an integrated on-chip Nb modulation flux line located beside the SQUID loop with a 100 nm nanogap. The non-hysteretic temperature range of the nano-SQUID is about 1.4 K from 4.6 K to 6.0 K, which could broaden the operation temperature range of the device. The maximal transfer coefficient V
Φ and peak-to-peak voltage ΔV are 8.53 mV/Φ
0 and 430 μV at 4.8 K, respectively.
Proximitized Josephson junctions in highly-doped InAs nanowires robust to optical illumination
Authors: Yang Lily , Steinhauer Stephan , Strambini Elia , Lettner Thomas , Schweickert Lucas , Versteegh Marijn A M , Zannier Valentina , Sorba Lucia , Solenov Dmitry , Giazotto Francesco
Published: October 2020

We have studied the effects of optical-frequency light on proximitized InAs/Al Josephson junctions based on highly n-doped InAs nanowires at varying incident photon flux and at three different photon wavelengths. The experimentally obtained IV curves were modeled using a resistively shunted junction model which takes scattering at the contact interfaces into account. Despite the fact that the InAs weak link is photosensitive, the Josephson junctions were found to be surprisingly robust, interacting with the incident radiation only through heating, whereas above the critical current our devices showed non-thermal effects resulting from photon exposure. Our work indicates that Josephson junctions based on highly-doped InAs nanowires can be integrated in close proximity to photonic circuits. The results also suggest that such junctions can be used for optical-frequency photon detection through thermal processes by measuring a shift in critical current.
Phase detection with neural networks: interpreting the black box
Authors: Dawid Anna , Huembeli Patrick , Tomza Michal , Lewenstein Maciej , Dauphin Alexandre
Published: October 2020

Neural networks (NNs) usually hinder any insight into the reasoning behind their predictions. We demonstrate how influence functions can unravel the black box of NN when trained to predict the phases of the one-dimensional extended spinless Fermi–Hubbard model at half-filling. Results provide strong evidence that the NN correctly learns an order parameter describing the quantum transition in this model. We demonstrate that influence functions allow to check that the network, trained to recognize known quantum phases, can predict new unknown ones within the data set. Moreover, we show they can guide physicists in understanding patterns responsible for the phase transition. This method requires no a priori knowledge on the order parameter, has no dependence on the NN’s architecture or the underlying physical model, and is therefore applicable to a broad class of physical models or experimental data.
Microscopic origin of molecule excitation via inelastic electron scattering in scanning tunneling microscope
Authors: Dong Guohui , You Yining , Dong Hui
Published: October 2020

The scanning-tunneling-microscope-induced luminescence emerges recently as an incisive tool to measure the molecular properties down to the single-molecule level. The rapid experimental progress is far ahead of the theoretical effort to the observed phenomena. Such incompetence leads to a significant difficulty in quantitatively assigning the observed feature of the fluorescence spectrum to the structure and dynamics of a single molecule. This work is devoted to revealing the microscopic origin of the molecular excitation via inelastic scattering of the tunneling electrons in the scanning tunneling microscope. The theory proposed here excludes the inelastic electron scattering as the origin of the observed larger photon-counting rate at the positive bias than that at the negative bias voltage.
Yang–Baxter deformations of the principal chiral model plus Wess–Zumino term
Authors: Hoare B , Lacroix S
Published: October 2020

A large class of integrable deformations of the principal chiral model, known as the Yang–Baxter deformations, are governed by skew-symmetric R-matrices solving the (modified) classical Yang–Baxter equation. We carry out a systematic investigation of these deformations in the presence of the Wess–Zumino term for simple Lie groups, working in a framework that treats both inhomogeneous and homogeneous deformations on the same footing. After analysing the cohomological conditions under which such a deformation is admissible, we consider an action for the general Yang–Baxter deformation of the principal chiral model plus Wess–Zumino term and prove its classical integrability. We also show how the model is found from a number of alternative formulations: affine Gaudin models,

E

-models, four-dimensional Chern–Simons theory and, for homogeneous deformations, non-abelian T-duality.
The application of BIM technology in road and bridge construction management
Authors: Jian Shen
Published: October 2020

In the whole construction process of highway and bridge, strict engineering quality and safety management, to some extent, is to help promote the long-term development of highway and bridge technology, at the same time, can effectively guarantee the overall safety of bridge and highway construction projects, and reduce the occurrence of safety accidents. In this paper, the application of BIM technology in the safety management of highways and bridges is analyzed to effectively improve the quality and efficiency of construction safety management measures, in order to provide important reference value for bridge construction management safety.
Suggestions on Over-the-horizon Cloud Warning System for Collision Avoidance of Two Intersections
Authors: Bin Liu
Published: October 2020

As the highway transportation network expands and modern technologies in the automobile industry develops, automobiles contribute a lot to human life, which have also led to many problems such as traffic accidents, traffic jams, environmental pollution, and energy waste. Take traffic accidents as an example. According to the China’s website of the State Administration of Work Safety, in 2011, about 211,000 people died or injured in traffic accidents, with the death toll hitting 62,000. Among all those accidents, rear-end collisions account for a large proportion, as the freeway rear-end accidents was about 33.4% of the total accidents in China and 24% in America. These traffic accidents have not only resulted in huge economic losses, but have also made highways more congested and occupied medical resources.
Expressway Traffic Flow Prediction Model Based on Bi-LSTM Neural Networks
Authors: Xue Xiaojuan , Jia Yuanhua , Wang Shengyou
Published: October 2020

In this paper, the expressway traffic flow prediction model based on the Bi-LSTM is designed, and four sections of expressway are applied to the model for training and evaluation. Through training and verification, the results show that the average prediction accuracy, MAPE, RMSE, and MAE of the proposed model is 89.54%, 10.46%, 31.55, and 24.58, respectively. In addition, in order to evaluate the effect of the proposed model, this paper introduces the ARIMA model for comparison. It is found that the prediction accuracy of the Bi-LSTM is 18.30% higher than ARIMA, the RMSE is reduced by 31.85, and the MAE is reduced by 26.32. The results show that the proposed Bi-LSTM model exhibits higher prediction performance. Afterwards, this paper makes a comparative analysis of the predicted value and the original value of each road section. The results show that the proposed model has a certain lag, and the forecast value of traffic flow is low for rush hours, however, the forecast value of traffic flow is higher in the low peak hours.
Research on new Energy Vehicle Modeling Design based on the Converge of Art and Technology
Authors: Wu Qing , Zhu Benyan , Xu Jinpeng
Published: October 2020

In the digital age, the vehicle has gone beyond the basic properity of the vehicle has gradually become a mobile data port. From the perspective of users, the comfortable, safe and high-speed driving experience of vehicles no longer meets the needs of users. In the future, vehicle will become an important tool for mobile life service. Therefore, the vehicle artistic modelling design is bound to the direction of digital, intelligent development. In this paper, the key factors affecting the vehicle art design are analyzed comprehensively and systematically, and the law of the new energy vehicle art design is explored from two aspects of technology and art. Then the method of new energy vehicle art design is discussed.
Optimum Selection of Structure Form and Materials for Highway Tunnel Insulation Layers
Authors: Li Borong , Han Changling , Fu Zhipeng
Published: October 2020

At present, the design of tunnel insulation layer in cold area mostly depends on engineering analogy, and the rationality of the design cannot be guaranteed. Therefore, in this study, on the basis of an ANSYS finite element analysis model, boundary conditions and calculation parameters are determined for the Jiangluling Tunnel in the cold region of Tibet, China. An analysis of the different laying methods of the thermal insulation layer between the permafrost section and the non-permafrost section is conducted, along with a comprehensive evaluation of several commonly used thermal insulation materials. Based on the results, the double layering method is recommended for the thermal insulation layer of the permafrost section. The commencement of the freeze–thaw cycle can be delayed by laying the insulation layer in the non-frozen soil section, and laying outside the wall is usually preferred. When the off-wall laying is not possible, the surface laying method is preferred.
Numerical Simulation and Test of filter Resistance of vehicle Wood Fiber Air filter
Authors: Liu Hong yu , Ni Yan shu
Published: October 2020

In order to increase the filter area of vehicle wood fiber air filter, improve the filtration efficiency of air filter, and reduce the filtration resistance of air filter, a kind of W-shaped wood fiber air filter is designed in this paper. Through the existing empirical formulas, it is found that the main factors affecting the filtration resistance are fiber filling ratio, Reynolds number Re and fiber arrangement. In this paper, the filter resistance of air filter is simulated based on Boltzmann method. Firstly, the change curve of filter resistance with filling rate and Reynolds number under parallel arrangement and staggered arrangement is studied, and compared with the existing theoretical formula. Then, by analyzing the fiber equivalent radius, filling rate and filter element thickness of filter resistance, the relationship curve between filter resistance and various influencing factors is obtained. Finally, the theoretical results are verified by using the self-developed filter performance test rig. The results show that the experimental results are in good agreement with the numerical simulation results. The filtration resistance does not change much at low Reynolds number, mainly decreases with the increase of the equivalent radius of the fiber, and increases with the increase of the filling ratio. With the increase of filter thickness, these results provide theoretical basis and suggestions for the structure optimization of air filter.
Study on the performance of new TPS high viscosity modifier on its modified asphalt
Authors: Zhang Yiluo , Cheng Yinglun , Dong Xuechao , Li Ning
Published: October 2020

In order to study the effect of a new TPS high viscosity modifier on the performance of its modified asphalt, a new type of TPS high viscosity modified asphalt with 3%, 8%, 13% and 18% content will be prepared, SBS modified asphalt and Japanese TPS modified asphalt were selected for comparison, high temperature and low temperature indexes were tested respectively, and the modification effect of the new TPS high viscosity modifier was verified through comparative analysis, and the more suitable dosage was determined. The results show that with the increase of the new TPS content, the performance of asphalt has been improved. When the content of the new TPS reaches 13%, the indicators of high-viscosity asphalt have fully met the requirements of the specification; By comparing the performance of each high-viscosity asphalt, and combining the requirements of high-viscosity asphalt and Japanese TPS. For the comparison between high-viscosity modifiers, the recommended dosage of this new TPS is between 13% and 18%.
Research on Aircraft/Engine Integrated Method of Civil Aircraft Products Development Oriented to System Engineering
Authors: Jinhai Yu , Jilei Fu , Yi Lu , Shan Fu , Dan Huang , Xin-Ai Zhang
Published: October 2020

This research proposes an aircraft/engine integrated design system construction method for civil aircraft based on system engineering oriented to large civil aircraft airworthiness certification. The aircraft/engine integrated design system of civil aircraft based on the “mapping model” highlights the logical completeness of the development evidence. This research contains two types of core design evidence: 1) design data of aircraft/engine integrated system; 2) aircraft/engine integrated system confirming and verifying data. The mapping model corresponds to the constraints of airworthiness regulations on the aircraft/engine integrated system design in three aspects: requirements analysis and confirmation, functional design, and design execution and verification, which promotes design data and airworthiness compliance evidence build in parallel.
Study on the Direct Operation Cost model of primary training aircraft
Authors: Yu Wang , Jun Lin , Zhi Deng , Tong Che
Published: October 2020

Which type of flight training aircraft the flight training school introduces depends largely on the direct operation cost (DOC) of the aircraft in the flight training. This paper divides DOC into two categories, namely fixed cost and variable cost. Then it constructed the calculating model for each cost item. The language of Java was used to achieve visual interface for the flight training aircraft. These above findings as well as the developed tool are expected to raise the evaluation accuracy in introducing the type of flight training aircraft for the flight training school.
The Demand of Specific Power for Trucks Operation Safety on The Uphill Section of Expressway
Authors: Guo Cheng , Xin Xiong , Ting Shang , Li Yin , Jie Tang
Published: October 2020

In this paper, the vehicle dynamics simulation software Trucksim was used to build road models and truck models to test the driving speed and climbing distance of 6-axis trucks under different conditions. By comparing with the correlation of the maximum slope length in the “Road Route Design Specification” (JTG D20-2017), we determine the demand of specific power for trucks on expressways with different design speeds. The results show that the initial speed, specific power and slope of the road affect the maximum slope length of the vehicle. The maximum slope length increases with the increase of the initial speed and the specific power of the vehicle and it decreases with the degree of longitudinal slope increases. The Demand of Specific power for trucks on China’s expressways increase with the decrease in design speed, which is 7.0kW/t (120km/h), 8.0kW/t (100km/h), and 9.0kW/t (80km/h) respectively.
Research on Traction Load Characteristics of Sichuan-Tibet Railway Under Different Weather
Authors: Wang Qi , Jia Junyi , Ye Jingjing
Published: October 2020

The Sichuan-Tibet Railway faces severe challenges such as changeable weather and long ramps. In order to reduce the ramp stop accidents of locomotive, the traction characteristic curve and braking characteristic curve of the locomotive are revised considering the wheel-rail adhesion limit under different weather conditions. Then the traction quality of dry rail, wet rail and ice rail is given. The modified characteristic curves and traction quality are used to simulate the traction load of Sichuan-Tibet Railway under different rail surface conditions. The results show that under dry rail conditions, the traction quality is 2500 tons and the driving power and regenerative braking power are extremely large, respectively 20MW and 16MW. Under wet rail and ice rail conditions, traction quality and regenerative braking power are significantly limited by adhesion. When ice rail, the traction quality is only 1200 tons; the driving power and the regenerative braking power are only respectively 14MW and 9 MW. At the same time, the running interval when growing uphill is 7 minutes longer than that under dry rail conditions. It provides a reference for the layout of the train operation diagrams and the design of the traction power supply system.
Study on the Temporal and Spatial Distribution Characteristics of Aquatic Traffic Accidents
Authors: Wang Fangping , Wang Lin , Zhixian He
Published: October 2020

The study of the characteristic of aquatic traffic accidents is significant for avoiding accidents effectively and guiding the supervision of water traffic safety and the search and rescue of water accidents. In this paper, the temporal and spatial characteristics of aquatic accidents from the aspects of accident occurrence and accident consequences were studied. The results indicated that the total number of verified distress incidents has significant temporal and spatial distribution characteristics; the number of verified distress incidents in coastal areas is significantly higher than that of inland rivers; the main causes of water accidents include collisions, stranding, fires and windstorm, all of which have a significant temporal distribution. In terms of accident consequences, the number of general danger is significantly higher than that of other levels of risk, and there is a significant temporal distribution characteristics on four danger levels. The main types of ships in distress are transporting ships, agricultural vessels, fishing boats and official ships. The number of transporting ships and fishing boats both fluctuated greatly in some months; there was no difference on the temporal distribution for the number of agricultural vessels and official ships in a year. There is no significant linear relationship between the number of distressed people and ships; the number of people in distress on the four types of ships all showed a certain time distribution characteristics; the number of deaths and disappearances in the main rivers rose sharply in June. By analyzing the temporal and spatial distribution characteristics of accidents and their consequences, this paper provides a basis for the relevant authorities to optimize the prevention and control of water accidents, the layout of water search and rescue forces and the timeliness of target searches.
Identifying key component in high-speed train based on complex network
Authors: Wang Baojin , Wang Yanhui , Hao Yucheng
Published: October 2020

The identification of key components is very important for the real-life system. Because the complex network is a powerful tool to analyze the behavior of the complex network, we explore the key nodes by using the complex networks. First, we utilize the degree, the betweenness, the closeness centrality, the eigenvector centrality and the Pagerank to reflect the importance of the node. Then the machine components are abstracted as a node, and the interactions are abstracted as an edge. According to the topology structure of the high-speed train, it is found that the high-speed train has the scale-free feature. By removing the nodes in the light of the sequence of nodes, we can obtain the effective measure and analyze the key nodes of the high-speed train performance degradation caused by the failure. The simulation results show that the node with the high PageRank value and degree is critical for the network. This work may contribute to the discovery of the key components in the high-speed train.
Research and Application of Cross Spatial Grid Method in Combined Box Girder Bridge with Corrugated Steel Webs
Authors: Jinbiao Zhang , Wei Zhang , Pengfei Wang
Published: October 2020

In order to further study the application of corrugated steel web composite box girder bridge in practical engineering, this paper selects a corrugated steel web box girder bridge with transverse diaphragms as the theoretical model, and uses the cross space grid method to simulate The model. Beam188 is the element type selected for this ANSYS modeling. The longitudinal element of the web is equivalent to a flat plate according to the plate and shell theory. The shape of the vertical element remains unchanged. Under the condition of its own weight, the natural frequency and deflection of the model are compared. The research results show that when the web is divided into whole and separated, the errors of the first-order natural frequencies of the two spatial mesh models and the solid finite element model are both within 10%, and the accuracy of the overall division is higher.
Numerical Study on Movement of Iron Concentrate in a Cargo Hold Based on Discrete Element Method
Authors: Zhanwei Wang , Jianwei Zhang , Wenfeng Wu , Jinshu Lu
Published: October 2020

Taking the cargo hold from a 57000 DWT bulk carrier as an example, the movement of iron concentrate particles in the cargo hold was simulated by using the discrete element software EDEM. The effect of water content on the movement of the cargo is replaced by variation of the particle’s friction coefficient. Considering the friction coefficient, particle size grading, particle collision recovery coefficient, rolling amplitude of cargo hold and cargo loading depth, 11 working conditions were designed and simulated. Results show that the decrease of friction coefficient, the increase of rolling amplitude and the loading capacity would aggravate the overall shift of the center of gravity of the cargos. In the case of the same loading depth, the more particles, the stronger the particle collision. And the collision recovery coefficient has little effect on the movement of particles.
Optimization of Transfer Layout and Organization on Urban Rail Transit —— A Case Study on Split Scheme of Beijing Rail Transit Line 13
Authors: Zhou Cong , Chen Junhua
Published: October 2020

Based on the practical case “the Consultation on Split Scheme of Beijing Rail Transit Line 13”, this paper collects and forecasts the passenger flow information, to combine the situation of the line with the surrounding land use, to probe into those possible problems of the existing split scheme deeply. By adopting digital construction technology, three sets of transfer layout optimization schemes are studied and designed, in order to realize the seamless connection between 13A Line and 13B Line after split. Then, this paper is supposed to establish the index evaluation system, and the satisfactory optimization scheme is obtained by the comprehensive comparison and selection from the aspects of convenience for passengers, feasibility of scheme implementation and so on. AnyLogic software is used to build a simulation model of human-vehicle interaction, which realizes the effect display and dynamic index acquisition. And the optimization effect is analyzed from the perspective of transfer platform security.
Optimal shipping schedule for a near-sea liner service route with time windows
Authors: Jiang Xi
Published: October 2020

This paper proposes a shipping schedule design problem arising in near-sea liner shipping that aims to determine containership deployment plan, the arrival time at each port of call, and sailing speed for a given liner service route with hard time windows. The problem is transformed into a mixed integer nonlinear nonconvex optimization model, and further transformed into a mixed integer linear optimization model, which can be effectively solved by commercial solvers. The case studies based on a real-life service route show the effectiveness and efficiency of the proposed solution method. Results also demonstrate that the port time windows affect the total cost of a ship route, the optimal number of ships to deploy, and the optimal schedule.