bluuebunny/crossref_metadata_2025 huggingface dataset:
Venom Profiling of a Population of the Theraphosid Spider Phlogius crassipes Reveals Continuous Ontogenetic Changes from Juveniles through Adulthood
Authors: Santana Renan , Perez David , Dobson James , Panagides Nadya , Raven Robert , Nouwens Amanda , Jones Alun , King Glenn , Fry Bryan
Published: March 2017

Theraphosid spiders (tarantulas) are venomous arthropods found in most tropical and subtropical regions of the world. Tarantula venoms are a complex cocktail of toxins with potential use as pharmacological tools, drugs and bioinsecticides. Although numerous toxins have been isolated from tarantula venoms, little research has been carried out on the venom of Australian tarantulas. We therefore investigated the venom profile of the Australian theraphosid spider Phlogius crassipes and examined whether there are ontogenetic changes in venom composition. Spiders were divided into four ontogenic groups according to cephalothorax length, then the venom composition of each group was examined using gel electrophoresis and mass spectrometry. We found that the venom of P. crassipes changes continuously during development and throughout adulthood. Our data highlight the need to investigate the venom of organisms over the course of their lives to uncover and understand the changing functions of venom and the full range of toxins expressed. This in turn should lead to a deeper understanding of the organism’s ecology and enhance the potential for biodiscovery.
Un cas de myiase humaine en France due à Sarcophaga (Liopygia) argyrostoma (Diptera, Sarcophagidae)
Authors: Withers Philippe , Roy Lise
Published: March 2017

Un cas de myiase secondaire, dans une plaie chirurgicale, chez un homme âgé dans le sud-est de la France est rapporté. L'agent est l'espèce Sarcophaga argyrostoma (Robineau-Desvoidy, 1830). Quelques cas comparables sont recensés dans la littérature médicale.
Un cas d'école : l'espèce type du genre Heterolepidoderma Remane (Gastrotriches, Chaetonotidae)
Authors: d'Hondt Jean-Loup , Balsamo Maria , Griili Paolo
Published: March 2017

L'année de description et de publication de la diagnose du genre Heterolepidoderma Remane (Gastrotriches, Chaetonotidae) étant controversée, les auteurs se sont livrés à une analyse critique des différentes publications dans lesquelles ce taxon a été utilisé au début, afin de déterminer la référence à prendre en compte comme étant celle de la définition originale.
Characterization of the VVV Survey RR Lyrae Population across the Southern Galactic Plane
Authors: Minniti Dante , Dékány Istvan , Majaess Daniel , Palma Tali , Pullen Joyce , Rejkuba Marina , Alonso-García Javier , Catelan Marcio , Contreras Ramos Rodrigo , Gonzalez Oscar A. , Hempel Maren , Irwin Mike , Lucas Philip W. , Saito Roberto K. , Tissera Patricia , Valenti Elena , Zoccali Manuela
Published: March 2017

Deep near-IR images from the VISTA Variables in the Vía Láctea (VVV) Survey were used to search for RR Lyrae stars in the Southern Galactic plane. A sizable sample of 404 RR Lyrae of type ab stars was identified across a thin slice of the fourth Galactic quadrant (295° < ℓ < 350°, −2.°24 < b < −1.°05). The sample’s distance distribution exhibits a maximum density that occurs at the bulge tangent point, which implies that this primarily Oosterhoff type I population of RRab stars does not trace the bar delineated by their red clump counterparts. The bulge RR Lyrae population does not extend beyond ℓ ∼ 340°, and the sample’s spatial distribution presents evidence of density enhancements and substructure that warrants further investigation. Indeed, the sample may be employed to evaluate Galactic evolution models, and is particularly lucrative since half of the discovered RR Lyrae are within reach of Gaia astrometric observations.
KELT-12b: A P ∼ 5 day, Highly Inflated Hot Jupiter Transiting a Mildly Evolved Hot Star
Authors: Stevens Daniel J. , Collins Karen A. , Gaudi B. Scott , Beatty Thomas G. , Siverd Robert J. , Bieryla Allyson , Fulton Benjamin J. , Crepp Justin R. , Gonzales Erica J. , Coker Carl T. , Penev Kaloyan , Stassun Keivan G. , Jensen Eric L. N. , Howard Andrew W. , Latham David W. , Rodriguez Joseph E. , Zambelli Roberto , Bozza Valerio , Reed Phillip A. , Gregorio Joao , Buchhave Lars A. , Penny Matthew T. , Pepper Joshua , Berlind Perry , Novati Sebastiano Calchi , Calkins Michael L. , D’Ago Giuseppe , Eastman Jason D. , Bayliss D. , Colón Knicole D. , Curtis Ivan A. , DePoy D. L. , Esquerdo Gilbert A. , Gould Andrew , Joner Michael D. , Kielkopf John F. , Labadie-Bartz Jonathan , Lund Michael B. , Manner Mark , Marshall Jennifer L. , McLeod Kim K. , Oberst Thomas E. , Pogge Richard W. , Scarpetta Gaetano , Stephens Denise C. , Stockdale Christopher , Tan T. G. , Trueblood Mark , Trueblood Patricia
Published: March 2017

We announce the discovery of KELT-12b, a highly inflated Jupiter-mass planet transiting the mildly evolved, V = 10.64 host star TYC 2619-1057-1. We followed up the initial transit signal in the KELT-North survey data with precise ground-based photometry, high-resolution spectroscopy, precise radial velocity measurements, and high-resolution adaptive optics imaging. Our preferred best-fit model indicates that the host star has

 = 6279 ± 51 K,

 = 3.89 ± 0.05, [Fe/H] = 

,

=

, and

 = 2.37 ± 0.17

. The planetary companion has

 = 0.95 ± 0.14

,

=

,

=

, and density

=

g cm−3, making it one of the most inflated giant planets known. Furthermore, for future follow-up, we report a high-precision time of inferior conjunction in

of 2,457,083.660459 ± 0.000894 and period of

days. Despite the relatively large separation of ∼0.07 au implied by its ∼5.03-day orbital period, KELT-12b receives significant flux of

erg s−1 cm−2 from its host. We compare the radii and insolations of transiting gas giant planets around hot (

K) and cool stars, noting that the observed paucity of known transiting giants around hot stars with low insolation is likely due to selection effects. We underscore the significance of long-term ground-based monitoring of hot stars and space-based targeting of hot stars with the Transiting Exoplanet Survey Satellite to search for inflated gas giants in longer-period orbits.
On the Relation of Silicates and SiO Maser in Evolved Stars
Authors: Liu Jiaming , Jiang Biwei
Published: March 2017

The SiO molecule is one of the candidates for the seed of silicate dust in the circumstellar envelope of evolved stars, but this opinion is challenged. In this work we investigate the relation of the SiO maser emission power and the silicate dust emission power. With both our own observation by using the PMO/Delingha 13.7 m telescope and archive data, a sample is assembled of 21 SiO v = 1, J = 2 − 1 sources and 28 SiO v = 1, J = 1 − 0 sources that exhibit silicate emission features in the ISO/SWS spectrum as well. The analysis of their SiO maser and silicate emission power indicates a clear correlation, which is not against the hypothesis that the SiO molecules are the seed nuclei of silicate dust. On the other hand, no correlation is found between SiO maser and silicate crystallinity, which may imply that silicate crystallinity does not correlate with mass-loss rate.
Which Bow Shock Theory, Gasdynamic or Magnetohydrodynamic, Better Explains CME Stand-off Distance Ratios from LASCO-C2 Observations ?
Authors: Lee Jae-Ok , Moon Y.-J. , Lee Jin-Yi , Kim R.-S. , Cho K.-S.
Published: March 2017

It is generally believed that fast coronal mass ejections (CMEs) can generate their associated shocks, which are characterized by faint structures ahead of CMEs in white-light coronagraph images. In this study, we examine whether the observational stand-off distance ratio, defined as the CME stand-off distance divided by its radius, can be explained by bow shock theories. Of 535 SOHO/LASCO CMEs (from 1996 to 2015) with speeds greater than 1000 km s−1 and angular widths wider than 60°, we select 18 limb CMEs with the following conditions: (1) their Alfvénic Mach numbers are greater than one under Mann’s magnetic field and Saito’s density distributions; and (2) the shock structures ahead of the CMEs are well identified. We determine observational CME stand-off distance ratios by using brightness profiles from LASCO-C2 observations. We compare our estimates with theoretical stand-off distance ratios from gasdynamic (GD) and magnetohydrodynamic (MHD) theories. The main results are as follows. Under the GD theory, 39% (7/18) of the CMEs are explained in the acceptable ranges of adiabatic gamma (γ) and CME geometry. Under the MHD theory, all the events are well explained when we consider quasi-parallel MHD shocks with γ = 5/3. When we use polarized brightness (pB) measurements for coronal density distributions, we also find similar results: 8% (1/12) under GD theory and 100% (12/12) under MHD theory. Our results demonstrate that the bow shock relationships based on MHD theory are more suitable than those based on GD theory for analyzing CME-driven shock signatures.
Probiotic administration improves sperm quality in asthenozoospermic human donors
Authors: Valcarce D.G. , Genovés S. , Riesco M.F. , Martorell P. , Herráez M.P. , Ramón D. , Robles V.
Published: March 2017

The objective of this study is to analyse the effect of the ingestion of two selected antioxidant probiotics strains (Lactobacillus rhamnosusCECT8361 andBifidobacterium longumCECT7347) on sperm quality parameters in asthenozoospermic males after three and six weeks of administration. Nine asthenozoospermic men without any medical treatment under similar diet conditions participated in the study. The quality of individual sperm samples was evaluated before (previous to ingestion), during (after 3 and 6 weeks of ingestion) and after probiotic administration (3 and 6 weeks after finishing the treatment). Sperm motility was evaluated by computer-assisted sperm analysis system, DNA fragmentation by sperm chromatin structure assay, cell viability by flow cytometry and measurement of intracellular H2O2(reactive oxygen species; ROS) by flow cytometry using dichloro-dihydrofluorescein diacetate. Sperm motility was drastically improved after the treatment (approximately 6 fold change), DNA fragmentation was statistically reduced after probiotic administration from (approximately 1.2 fold change) and intracellular H2O2level was decreased (approximately 3.5 fold change). Cell viability was not affected by the treatment. The significant improvement in sperm motility and the decrease in DNA fragmentation reported in this study provide preliminary evidence that probiotics could be administrated to improve motility and decrease DNA fragmentation and ROS levels in asthenozoospermic human males.
Effect of probiotic on innate inflammatory response and viral shedding in experimental rhinovirus infection – a randomised controlled trial
Authors: Turner R.B. , Woodfolk J.A. , Borish L. , Steinke J.W. , Patrie J.T. , Muehling L.M. , Lahtinen S. , Lehtinen M.J.
Published: March 2017

Ingestion of probiotics appears to have modest effects on the incidence of viral respiratory infection. The mechanism of these effects is not clear; however, there is evidence from animal models that the probiotic may have an effect on innate immune responses to pathogens. The purpose of this randomised, placebo-controlled study was to determine the effect of administration of Bifidobacterium animalis subspecies lactis Bl-04 on innate and adaptive host responses to experimental rhinovirus challenge. The effect on the response of chemokine (C-X-C motif) ligand 8 (CXCL8) to rhinovirus infection was defined as the primary endpoint for the study. 152 seronegative volunteers who had been supplemented for 28 days, 73 with probiotic and 79 with placebo, were challenged with RV-A39. Supplement or placebo administration was then continued for five days during collection of specimens for assessment of host response, infection, and symptoms. 58 probiotic and 57 placebo-supplemented volunteers met protocol-defined criteria for analysis. Probiotic resulted in higher nasal lavage CXCL8 on day 0 prior to virus challenge (90 vs 58 pg/ml, respectively, P=0.04, ANCOVA). The CXCL8 response to rhinovirus infection in nasal lavage was significantly reduced in the probiotic treated group (P=0.03, ANCOVA). Probiotic was also associated with a reduction in nasal lavage virus titre and the proportion of subjects shedding virus in nasal secretions (76% in the probiotic group, 91% in the placebo group, P=0.04, Fisher Exact test). The administration of probiotic did not influence lower respiratory inflammation (assessed by exhaled nitric oxide), subjective symptom scores, or infection rate. This study demonstrates that ingestion of Bl-04 may have an effect on the baseline state of innate immunity in the nose and on the subsequent response of the human host to rhinovirus infection. Clinicaltrials.gov registry number: NCT01669603.
The Contribution of Pierluigi Petrobelli to Tartini Studies
Authors: Durante Sergio
Published: March 2017

In the spring of 2012 Pierluigi Petrobelli, up to the last days of his musicological activity a dedicated researcher into the life and musical oeuvre of Giuseppe Tartini, died in Venice. Petrobelli laid the foundations for all further studies on this subject. He had both objective scholarly interests as well as subjective reasons for his unusually prolonged interest in the composer from Piran. Petrobelli left a rich private archive of personal recollections and documentary evidence. Through Petrobelli’s example, and also by reference to other cases, the author identifies the most urgent and significant goals for future research on Tartini and, more generally, for research on European music of the eighteenth century.
Historična glasbila v poustvarjalni praksi: možnosti in perspektive v slovenski glasbeni kulturi
Authors: Koter Darja
Published: March 2017

Aktualno izvajanje stare glasbe je tesno povezano s proučevanjem nekdanjih poustvarjalnih praks, z ohranjanjem historičnih glasbil, delovanjem specializiranih ansamblov in izobraževanjem. Bistveno vlogo pri tem razvoju na Slovenskem imajo muzejske zbirke glasbil, nacionalni programi za oživljanje kulturne dediščine ter posamezne kulturne in izobraževalne ustanove. V danih pogojih je potrebno izhajati iz primerov dobrih praks ter iskati in razvijati nove možnosti, ki bi jih bilo potrebno iskati v glasbenih zbirkah slovenskih muzejev in na področju visokega glasbenega šolstva.
Georg Link and his treatise on dance from 1796
Authors: Brocza Pia , Motnik Marko
Published: March 2017

This article discusses Georg Link's Vollkommene Tanzschule, a German treatise on ballroom dancing of the 18th century, published by the Slovenian book printer Franz Joseph Jenko in Celje (1796). Some details about Link’s biography are followed by explanatory notes on the topics raised in this treatise.
Manuscript, Print and the Market for Music in Early Modern Europe
Authors: Fenlon Iain
Published: March 2017

The shifting tensions between two major features of the dissemination of music in the early modern era – between manuscript and printed transmission on the one hand, and between “centre” and “periphery” on the other – are explored in this paper via the example of the dissemination of the motet Aspice Domine by Jacquet of Mantua. Central to the dynamics of both is the evolution of an expanding market for
printed books of music, a process stimulated by technological innovation as well as by significant changes in societal attitudes towards the art
of music itself – changes that were themselves promoted through the medium of print.
Between Prague and Pirna: A Story from the Beginning of the Thirty Years’ War
Authors: Baťa Jan
Published: March 2017

This paper considers two polyphonic sources from the turn of the seventeenth century (CZ-Pu, 59 E 9726/1–3 (olim XXXIII C 20), and D-Dl, Mus. Pi. 2), which are linked to the Bohemian Humanist and musician Nicolaus Dionysius (ca. 1577–1647), who was expelled from the Kingdom of Bohemia to Pirna, Saxony, in 1627 because of his Lutheran faith. This paper summarizes Dionysius’s life and works and discusses his role in the transportation of these two musical sources from Prague to Pirna during the Thirty Years’ War.
Contrafacta of Operatic Arias among the Dominicans of Baroque Silesia
Authors: Jeż Tomasz
Published: March 2017

The paper discusses contrafactum practice in the manuscripts of Pius Hancke, a Dominican monk from Silesia. His scores point to pathways for the dissemination of the operatic repertory and document the process of change in its social function associated with the adaptation of secular music to a liturgical context.
How to Create a National Opera? The Lisinski Case. Imaginary Memoirist Sketches with an Epilogue
Authors: Katalinić Vjera
Published: March 2017

The article deals with the situation in the 1840s, when the young composer Vatroslav Lisinski (1819–1854) was asked by Zagreb patriots to compose a national opera. He was not musically well-educated for such a task, and the poets were not experienced in writing librettos either. The author presents these issues, the ensemble, and the performance of Ljubav i zloba (Love and Malice) by way of an imagined monologue by the composer.
Croatian Historical Myth, South-Slavic Brotherhood and the Death of the Opera
Authors: Badurina Natka
Published: March 2017

Starting from the analysis of what remains of the opera Petar Svačić, composed in 1902 in Trieste by Josip Mandić to a libretto by Karlo Lukež, the paper discusses the ideas of nationhood then current among young Croats, the survival of sublime pathos in the context of desublimation and the impact of political pragmatism both on the creation of the national opera and on its reception.
Language, Literature and Music in Slovenian Cultural and Political Aspirations before 1914
Authors: Cigoj Krstulović Nataša
Published: March 2017

The article presents the interplay between cultural and political aspirations of Slovenians within the multinational Habsburg Empire before 1914. The case study of selfdefined images of Slovenians in literature and music outlines the relation between canonical and popular folk-like repertoires vs. original creativity and its meaning in formation of national identity and cultural memory.
Fernando Cassinello Pérez, arquitecto poliédrico
Authors: Centellas Soler M. , García-Sánchez J. F.
Published: March 2017

La obra del arquitecto almeriense Fernando Cassinello Pérez (Almería, 1928-Madrid, 1975) se apoya sobre tres pilares: la producción arquitectónica centrada en el proyecto y construcción de viviendas y establecimientos hoteleros; la actividad académica como Catedrático de Construcción en la Escuela de Arquitectura de Madrid, y la inquietud investigadora desarrollada en el Instituto Eduardo Torroja del que llegó a ser director, y ejercida como autor de libros y artículos de investigación, como conferenciante divulgador, como ponente en importantes congresos o como miembro activo de asociaciones internacionales vinculadas a la construcción con hormigón. Este artículo hará un repaso de su prolífica actividad como arquitecto poliédrico y dará cuenta de las interesantes obras que proyectó y construyó apoyándose en una dilatada cultura arquitectónica contemporánea e internacional.
Heuristic Evaluation of an Institutional E-learning System: A Nigerian Case
Authors: Daramola Olawande , Oladipupo Olufunke , Afolabi Ibukun , Olopade Ademola
Published: March 2017

Many African academic institutions have adopted the use of e-learning systems, since they enable students to learn at their own pace, time, and without restriction to the classroom. However, evidence of usability evaluation of e-learning systems in Africa is mostly lacking in the literature. This paper reports the experimental heuristic evaluation of the e-learning system of a Nigerian University. The objective is to demonstrate the application of expert-based usability evaluation techniques such as Heuristic evaluation for assessing the attributes of existing e-learning systems. The study revealed that while the e-learning systems has strong credentials in terms of support for Web 2.0 activities, good learning content and boasts of useful e-learning features, improvements are necessary in other areas such as interactive learning, assessment and feedback, and quality of learning content. The study adds to the body of extant knowledge in the area of usability evaluation of e-learning systems in African institutions.
Exploring Adaptive Teaching Competencies in Big Data Era
Authors: Huda Miftachul , Maseleno Andino , Shahrill Masitah , Jasmi Kamarul Azmi , Mustari Ismail , Basiron Bushrah
Published: March 2017

In the last decade, the demand of digital tool to support educational process has been emerged among the universities around the world. In big data era, the demand to utilize it in adaptive teaching should be considered to enable the teaching performance especially in accessing the resources. This paper aims to explore the framework model as a way for teachers in adapting big data to help their teaching performance especially in accessing the resources. The literature review was conducted from peer review journals, books and conferences. The findings reveal that process and management skills should be engaged into adaptive teachings competencies. It included commitment in planning, time management, and technology skills. This study is expected to contribute in strengthening teaching performances in the application guideline in the big data era to support assessing the multi-channels of sources of knowledge to extract new insights of value in exploring the adaptive teaching competencies.
Attentional Control and other Executive Functions
Authors: Drigas Athanasios , Karyotaki Maria
Published: March 2017

Current article aims to shed light on the reciprocal relation between attentional control and emotional regulation. More specifically, there is a verified relation between attention and cognitive, metacognitive and emotional processes, such as memory, perception, reasoning as well as inhibitory control, cognitive flexibility, self-monitoring and positive moods. In addition, positive mood has been already reciprocally related to a broad attentional scope as well as to an increased cognitive flexibility. Future research should focus on the effects of attentional control on cognitive control processes, thereby, on individuals’ emotional regulation, as a whole. Evidently, an advanced research in the relation of attentional control and emotional regulation could develop a comprehensive methodology for counterbalancing the difficulties facing individuals with ADHD, Autism Spectrum Disorder, Oppositional Defiant Disorder or even depression.
Problematising “Lad Culture”
Authors: Stead Annis
Published: March 2017

The term “lad culture,” referring to dominant attitudes and behaviours in UK University contexts, will be examined with a view to rejecting the term. While the links between excessive alcohol consumption, sexual violence and bullying/intimidation can be understood with relation to gender norms, the term will be troubled. It is argued that the term “lad culture” implies similarity between disparate identities/experiences/behaviours, which ignores the continuum of behaviours and attitudes subsumed under the definition. As a result, extremely harmful behaviours are trivialised both by actors and those facing such behaviours. Qualitative findings from 8 semi-structured interviews with University campaign stakeholders are presented, recommending that support for anti-“lad culture” campaigns should be improved, insinuating that the ambiguous nature of the term “lad culture” has repercussions not only for self-defined “lads” but for those attempting to tackle associated behaviours.
Empowering Learning Culture as Student Identity Construction in Higher Education
Authors: Huda Miftachul , Sabani Noraisikin , Shahrill Masitah , Jasmi Kamarul Azmi , Basiron Bushrah , Mustari Mohd Ismail
Published: March 2017

As a mean to enhance and improve students' understanding in terms of knowledge gaining and skill development in Higher Education (HE), learning culture enables them to reflect on what they have learnt, contemplate on their ideas and to take advantage of these activities to develop their skills and practices. This chapter will explore the empowerment of learning culture to strengthen the students' identity in HE. The findings reveal that attempts to promote learning culture involve three core stages: classroom management, global mind-set skills and intercultural competence (IC), which may become the basis to enhance their cultural identities while undertaking their studies in HE. Such valuable applications integrated may be incorporated an important stage to develop better performance on building students' identity in HE. This chapter is expected to contribute in offering further understanding in terms of quality critical thinking through fostering ethical, reflective and professional practices as an endeavour to further improve students' competencies.
Marginality and Mattering
Authors: Hadley Wanda , Hsu Jennifer , Addison Mark Antony , Talbot Donna
Published: March 2017

Students with learning disabilities are the fastest growing at-risk population transitioning to higher education institutions. This chapter explores the academic adjustment issues students with learning disabilities experience in their transition to the college environment. Their experiences are explored and reported through the context of student development theory of marginalization. The chapter discusses students' access and adjustment to the campus culture and how this experience influences their identity development.
Cultural Problems in Teaching and Learning of English as a Foreign Language in Tunisia
Authors: Rahal Aicha
Published: March 2017

Culture now becomes a key element in most educational systems, particularly in Higher education, where cultural Studies are an essential part of most language instruction. The aim of this chapter is to explore the cultural challenges that hinder the process of learning English in Tunisia and to suggest solutions for overcoming these. A questionnaire was used as the primary data collection material. It was found that lack of authentic materials, lack of cultural knowledge of the target language, poor textbooks, limited exposure to authentic culture environment and native culture interference are considered to be the main problems. The results also showed that these challenges can be remedied by using more authentic materials, revising the content of textbooks, the integration of technology and cultural awareness.
Effect of Electrode Distance on Jetting Behavior of Non-Particle Nano Ag Conductive Ink in Electrohydrodynamic Micro Jet Printing
Authors: Xing Bo , Zuo Chun Cheng , Huang Feng Li , Lu Ye Bo , Hu Guang Shan
Published: March 2017

The effect of electrode distance on jetting behavior of non-particle nanoAg conductive ink during Electrohydrodynamics (EHD) under the direct current voltage is investigated. Experiments results indicate that the height of the meniscus increases while the curve decreases with the increase of electrode distance, and the jetting behavior evolves from pulsate cone jetting to pulsate micro dripping jetting. The low voltage combined with long electrode distance resulted in returning of meniscus to its original shape. With the increase of voltage, the increased electrode distance result in the increase of meniscus deformation and the electrode distance for maintaining the stable jetting was increased. Under the same voltage, the line width increases with the increase of electrode distance. The exceeded long electrode distance and high voltage resulted in jitter of elongated meniscus thus is not beneficial for the printing quality control.
The Effect of Mg on the Wetting Behavior of SiC-Al System
Authors: Liu Zhi Xin , Lin Wen Song
Published: March 2017

The wetting behavior of SiC by molten Al and Al-Mg alloys using the sessile-drop testing equipment was investigated. The results showed that Mg has a remarkable influence on the wettability and reaction in the Al/SiC system. The contact angle between SiC substrate and molten Al-Mg alloys decreased more quickly with increasing of Mg content. The transition temperature from non-wetting to wetting dropped with increasing of Mg content, suggesting that the addition of Mg does promote the wettability of SiC by molten Al. The role of the Mg addition on the wetting was presumably attributed to its deoxidation as well as the inhibition of the interfacial reaction between Al and SiC.
Magnetic and Photochemical Properties of Cu Doped Hematite Nanocrystal
Authors: Kang Myung Jong , An Na Hyeon , Kang Young Soo
Published: March 2017

In this report, the magnetic and photochemical properties of Cu doped hematite nanocrystal was investigated intensively. The Cu doped hematite nanocrystals were prepared by hydrothermal method, changing the molar ratio of Cu precursors. The XRD and XPS techniques are used for revealing crystal and chemical state of Cu doped hematite nanocrystal. Raman spectroscopy was also used for confirming Cu atoms replacing Fe position in Cu doped hematite crystal. The UV-vis and UPS were used for assigning electronic band position for photocatalytic properties. Cu doped hematite showed the enhanced photocatalytic properties within photodegradation of methyl orange. Finally, by checking magnetic hysteresis loops of Cu doped hematites with VSM, it was revealed that the magnetic property of Cu doped hematite nanocrystal was increased after doping Cu into hematite nanocrystal, get the distortion of magnetic sub-lattices.
Microstructure Characteristics and Properties of 1561 Aluminum Alloy Weldments Processed by Different MIG Welding
Authors: Han Shan Guo , Zheng Shi Da , Cai De Tao , Yi Yao Yong , Luo Zi Yi
Published: March 2017

The mechanical properties and microstructural features of 1561 aluminum alloy weldments processed by single-wire MIG welding and CMT TWIN welding are investigated. The microstructure and mechanical properties of welded joints were studied by nondestructive testing, metallurgical test, scanning electron microscopy test, fatigue and tensile test. It is revealed that the welding efficiency of CMT TWIN welding is more than six times as much as single-wire MIG welding. It can be easy to find weld zone (WZ), fusion line (FL), heat affected zone (HAZ) and base metal (BM) with different characteristics in the metallographic specimen. In weld zone, the particle phase sizes are smaller than that of base material, but the densities of particle phase are increased. The sample fatigue strength of CMT TWIN welding is higher than the singe-wire MIG welding. It is suggested that the CMT TWIN welding has several advantages compared with single-wire MIG welding.
Fatigue of Low Carbon Alloy Steel (JIS S45C) and a New Method of Fracture Surface Analysis
Authors: Kida Katsuyuki , Ishida Masayuki , Mizobe Koshiro , Yoshida Isamu , Tamura Ayumu , Nakane Kazuaki
Published: March 2017

In this study, we observed cracks and fatigue surface of low carbon alloy steel (JIS, S45C)) in order to investigate the material structure and fatigue fracture surface. After fatigue crack growth tests of CT specimens, three-dimensional surface roughness of the fracture surface was studied using a laser confocal microscope (LCM). An image analysis method of Homology theory was applied to the LCM’s data. The Betti numbers, b1 were calculated at four points on the fracture surfaces in order to study the effect of asperity heights on the b1 values.Based on these analyses, we found the relation between the structure and fatigue cracks from the viewpoint of Homology.
The Studies of Plasma Torch Processes by Laser Beam Welding
Authors: Letyagin Igor Yu. , Trushnikov Dmitriy , Belenkiy Vladimir Ya.
Published: March 2017

The manufacturing of significant products with help of laser beam welding technologies requires higher stability characteristics of such technologies; this explains the necessity to run on-line testing procedures of through pro-melting process. This type of testing can be carried out by the registration of plasma streams that occur under a work piece by through pro-melting [i.e. metal undergoes an intensive laser beam thermal processing].
The Effect of Reduction Parameter in Processing Lump Ore with Green Sugarcane Bagasse Reductor in Muffle Furnace
Authors: Soedarsono Johny Wahyuadi , Arifin Cornelius Erick , Saragi John Samuel , Putra Amanda Arief , Kawigraha Adji , Sulamet-Ariobimo Rianti Dewi , Rustandi Andi
Published: March 2017

Sugarcane bagasse has demonstrated its ability to act as a reductor in iron-reduction process. As a reductor, bagasse has specialties as double-acting reductor equiped with volatile matter. This is the first study of the use of bagasse as reductor in iron-reduction process. The parameter concluded from this study was used for the second study which report has been submitted for publication. The aim of this study is to discuss the effect of reduction process parameter to the use of bagasse as reductor. This study was divided into 2 step. The first step is determining the optimum reduction process temperature and weight ratio. The reduction temperature varied as 700, 800, 900 and 1000 °C and the weight ratio are 1:2 and 1:4. The process duration is 30 minutes. The second stape is determining the process duration. The process duration will be varied as 30, 45 and 60 minutes. The condition of bagasse is air dried basis. The result shows that the reduction process produced wustite (FeO).
The Relationship of Processing Parameters and Surface Topography of Selective Laser Melted GH4169 Alloy
Authors: Liu Bin , Bai Pei Kang , Li Yu Xin , Liu He Ping
Published: March 2017

Selective laser melting (SLM) technology based on powder bed has been used to manufacture GH4169 samples. In the present work, taking Ni-based powders of GH4169 as experiment material, the good technological parameters of SLM were determined by analyzing the effect of the laser electric current, the scan speed ,the laser pulse width, the laser light frequency, the push powder thickness, the scan interval and the scanning way on Single-layer single-channel scanning, single-layer multi-channel scanning and multi-level multi-channel scanning. The effects of process parameters on the powder formability was analyzed. The cross-sections morphology and density of the block specimen prepared under the different SLM process parameter were studied. The optimal process parameters were the scanning speed of 150 mm/min, the laser pulse width of 5.0 ms, the push powder thickness of 0.15 mm, the scanning current of 140 A, the laser light frequency of 12Hz and the scan interval of 0.25mm.
Analysis on the Action of Oxidant in Chemical Mechanical Polishing of 304 Ultra-Thin Stainless Steel
Authors: Su Jian Xiu , Peng Yan An , Liu Zhen Hui , Wang Zhan Kui , Fu Su Fang
Published: March 2017

The ultra-thin stainless steel sheet will be used in flexible displays for substrate material. The application of the substrate requires its surface very smooth, no defects and damage free. Chemical mechanical polishing (CMP) has been considered as a practical and irreplaceable planarization technology in the ultra precision machining of the flexible display substrate. In chemical mechanical polishing of ultra-thin stainless steel, the oxidant of polishing slurry has an important influence on the material removal rate (MRR). In this paper, the influences of oxidant in slurry on MRR and surface roughness had been studied in CMP of ultra-thin 304 stainless steel based on alumina (Al2O3) abrasive. The research results show that the oxidant of the hydrogen peroxide and the oxalic acid have the interaction in CMP 304 stainless steel and when using the only one oxidant in polishing slurry, the hydrogen peroxide or oxalic acid, the MRR is less than the maximum. The oxalic acid can provide a strong acidic environment to ensure the stability of the hydrogen peroxide in polishing slurry and to improve the MRR in CMP 304 stainless steel. The research results can provide the reference for studying the slurry in CMP of ultra-thin stainless steel.
Distribution of Aspect Ratio of Fatigue Crack at Notch Root Depending on Crack Initiation Point of Annealed Steel, JIS S45C
Authors: Matsueda Takahiro , Ishida Masayuki , Mizobe Koshiro
Published: March 2017

Aspect ratio of crack is one of key factors of fatigue strength prediction in engineering design and civil structures using fracture mechanics. Their empirical shapes are changed by stress concentration. However, it was not clear how stress concentration affects empirical results including crack shape and size. In this study, in order to investigate the relationship between stress concentration and crack geometry, the aspect ratio of cracks at notch root was observed and discussed. We succeeded to capture two important relationships which are between stress concentration and crack shape, and between crack initiation point at notch root and crack shape, respectively.
Numerical Simulation and Experimental Research on Forging of Cylinder Bottom
Authors: Xia Yu Feng , Wang Tian Yu , Zhao Jia , Li Shuai Chen
Published: March 2017

In this work, a new forging process is proposed for bottom instead of the original casting process. In order to achieve better technological parameters combination, the finite element method (FEM) and orthogonal experiment were utilized to research the process of cylinder bottom forging. Forming maximum load, mould maximum wear and forging maximum damage were chosen as evaluating indicators. Billet preheating temperature, the mold preheating temperature, forging speed and friction factor were taken into consideration to analysis the influence on forming quality for the bottom. The significant factors and the optimal value, i.e. Billet preheating temperature (1150°C),the mold preheating temperature (350°C),the forging speed (50mm/s) and the friction factor (0.2) were determined. After the technological experiment, the qualified quality cylinder bottom can be manufactured by the optimized forging process.
Numerical Simulations of Low Pressure Die-Casting for A356 Aluminum Rims
Authors: Huang Pei Hsing , Wu Wei Jen , Shieh Chung Han
Published: March 2017

This study conducted mold flow analyses on low pressure die-casting A356 aluminum rims to improve the shrinkage and porosity defects which usually occurs in die-castings so as to enhance the quality of die-casting wheels. We adopted different lift tube designs with cylindrical, taper opening and back taper opening structures while discussing the filling, exhaust, and solidification of molten flows and predicting the shrinkage and porosity formed based on the retained melt modulus. The study found that the configuration of lift tube as well as the optimization of process parameters such as the processing pressure and progressive time could effectively reduce the formations of shrinkage and porosity defects and improve the quality of die-castings.
Researches of Mechanical Properties of Welded Joint Based on the Method of Micro Sample
Authors: Du Jia Zheng , Zhao Zhen Yang
Published: March 2017

Welding is one of the most important ways to connect metal materials. The mechanical properties of the welded joint are not uniform, which affects the overall strength of the joint. Through the traditional experimental method, it is difficult to test the mechanical properties of materials in different regions of welded joint. With 2219 aluminum alloy friction stir welding (FSW) joint as the research object, two kinds of micro sample methods, nanoindentation test and micro specimen tensile test, were respectively adopted for testing. Through these experimental studies, the mechanical properties of materials were obtained in different regions of welded joint: such as the elastic modulus, yield limit, ultimate strength and so on. The changes of the mechanical properties of the welded joint were analyzed from the weld center to the base metal. Through the data comparison, the results of the two kinds of micro test methods are basically consistent with each other. The elastic modulus in the center of the weld is relatively large, and decreases gradually with the transition to the base material. The yield limit and the ultimate strength in the center of the weld are relatively small, and increase gradually with the transition to the base material. The elongation is relatively high in the heat affected zone and relatively low in the weld zone and the base metal zone. These studies also provided the data basis for the research on the strength of welded joint.
Morphology, Structure and Corrosion Resistance of Nano-Enamel Coating Changed on Ti-6Al-4V Alloy
Authors: Li Yu Lin , Huang Zhe Rui , Zhong Qing Dong , Xiao Chen , Li Hui , Sun Jin Hu
Published: March 2017

Using a sol-gel method and impregnation technology to produce nanoenamel coating on polished Ti-6Al-4V alloy. The morphology, structure and phase composition of nanoenamel coatings modified on mild steel were identified with X-ray diffraction (XRD), scanning electro microscopy (SEM) and tested by some electrochemical methods, such as open circuit potential and potentiodynamic polarization testing [1]. All of these method can select the samples which perform the best corrosion resisitance.
Surface Modification of Aramid Fiber III by the Atmospheric-Pressure Air Plasma Treatment
Authors: Wang Feng De , Lv Yong Lei , Wei Xu , Ling Guo , Han Zhe Wen
Published: March 2017

Aramid fiber III has been treated by plasma treatment on different atmosphere gas to enhance the adhesive force between Aramid fiber III and epoxy matrix. The results of contact angle and SEM indicate that the obvious corrosion appear in the surface of aramid fiber III after plasma treatment. The yarn pull-out method was used to evaluate the effect of surface modification. The contact angle of original aramid fiber III is 65.9 o, and after treated the contact angle is declined to 62.2 o. The evaluation results show the tensile strength and NOL ILSS of treated Aramid fiber III/epoxy composite increased by about 10%. In summary, the effect of plasma treatment is obvious and has potential industry application.
Electrodeposition of Cu-Sn-Graphite-Al2O3 Composite Coatings and their Tribological Properties
Authors: Wang Xiao Hui , Ying Li Xia , Zhang Chun Jie , Lv Xiu Peng
Published: March 2017

In order to improve the wear resistance, ensure the self-lubricating property, Cu-Sn coatings were prepared on the basis of non-cyanide pyrophosphate-stannate and strengthened by combining sol-gel method and composite electroplating technology. In the paper, graphite Sol and Al2O3 Sol were added to the Cu-Sn electroplating solution to obtain nanoparticles enhanced Cu-Sn-graphite and Cu-Sn-graphite-Al2O3. The effect of graphite Sol and Al2O3 Sol addition on composite coatings was investigated, such as surface morphology, micro-hardness and tribological properties. The result shows that the incorporation of the graphite Sol and the Al2O3 Sol lead to change the structure of the composite coatings. When the additions of graphite Sol and Al2O3 Sol were 110mL/L and 40mL/L respectively, the graphite and Al2O3 particles are uniformly distributed in the Cu-Sn matrix and contribute greatly to improve the hardness and tribological properties of Cu-Sn alloy coating.
Characteristics of Laser Cladded Nickel-Based Chromic Carbide Composite Coatings
Authors: Dai Sheng , Zuo Dun Wen , Zhao Xian Rui , Wang Jin Fang
Published: March 2017

To improve the surface hardness and wear resistance of metal parts. Ni-based chromic carbidecomposite coating was prepared on the carbon steel (0.45 mass% C) substrates by laser cladding. Microstructure and wear properties of composite coatings were investigated by SEM, EDS, XRD, Vickers micro-hardness tester and wear machine. The results show that good metallurgical bonding between the Ni-based chromic carbidecomposite coating and carbon steel substrate. Micro-hardness of Ni-based Cr3C2 composite coating along the layer depth presents an evident stepladder distribution. The average micro-hardness of the laser clad coating is about 950 HV. The result of wear experiment shows that Ni-based Cr3C2 composite coating processes good wear resistance.
Effect of the Bluing Solution on Corrosion Resistance of the Oxide Film Prepared in Steel
Authors: Li Hui , Sun Jin Hu , Zhong Qing Dong , Huang Zhe Rui , Li Yu Lin
Published: March 2017

The process of Quench-bluing treatment on low-carbon steel were introduced. The continuity and corrosion resistance of the blue oxide film that is treated by different types of bluing solution and bluing solution with different concentrations of NaOH were evaluated by drip experiment and electrochemical test .The results show that Quench-bluing process can make the corrosion resistance better when use the solution of 500g/L NaOH and 150g/LNaNO2 as Quench liquid and 15% NaOH in the solution can form the blue oxide film with the best corrosion resistance.
Research on the Preparation of HA/PEEK Gradient Composites by Impregnation Method and the Biosecurity
Authors: Ma Rui , Dai Ling Jun , Wang Lin , Song Yu Dian
Published: March 2017

This study prepares the HA/PEEK gradient composites with special structural design by impregnation method, which eases the contradiction of the HA/PEEK composites between the lack of bioactivity due to low HA contents and the poor mechanical properties due to high HA contents, and effectively improves the bioactivity and mechanical properties of the PEEK-based materials, and then evaluates the biosecurity of HA/PEEK gradient composites. The main functional cell of bone formation—osteoblast is adopted for the co-culture with PEEK, HA/PEEK gradient composites and the leach liquor, and the effects of PEEK and HA/PEEK gradient composites on the proliferative functions of osteoblast are studied by in vitro cytotoxicity test. The results show that no harmful admixtures are produced in the process of injection moulding, and the leach liquors of PEEK and HA/PEEK gradient composites have no effects on the proliferative functions of osteoblast, with good osteoblast compatibility.
Preparation and Mechanical Properties of Diamond Honing Oilstone
Authors: Tao Jun Nan , Zhang Xiang Zhao , Liu Gui Wu , Xu Zi Wei , Shao Hai Cheng , Qiao Guan Jun
Published: March 2017

The diamond honing oilstone was fabricated by hot-pressing at 550–650 °C and 25 MPa pressure for 4 min, using Cu–Sn based alloys as binder metal and uncoated or W-coated diamond grains as abrasive material. The microstructures and phase compositions of the honing oilstone were examined and analyzed by SEM and XRD. Effects of the oilstone composition, sintering temperature and volume fraction of diamond grains on the mechanical properties of diamond honing oilstone were investigated. The experimental results show that the interfaces between the diamond grains and metal matrices of all the oilstone samples are smooth and no defects are observed in the metal matrices. The bending strength and rockwell hardness of the honing stones increase with the sintering temperature increasing from 550 °C to 650 °C, and the bending strength decrease with the increase of diamond grains faction. The minimum grinding ratio is obtained as the diamond was W-coated, which can be attributed to the improved interfacial bonding derived from the W coating.
Properties on the Freeze-Thaw Resistance of High Performance Concrete Using Fibers and Mineral Admixtures
Authors: Lee Seung Jo
Published: March 2017

For the examination of freeze-thaw action, which is a durability deterioration factor of concrete, this study aimed to investigate the deterioration of concrete under the freeze-thaw condition of the high-performance concrete manufactured using both fiber and mineral admixture. After 300 freeze-thaw cycles, the relative dynamic moduli of the FA-PP-02 and SF-01 specimens were 85.7% and above 92.9%, respectively, and the compressive strengths of the FA-PP-02 and GA-Ny-03 specimens were 61% and above 83%, respectively. Among the high-performance concrete specimens, the specimen that used only Steel Fiber and the specimen that used both Garnet and Nylon showed the most outstanding freeze-thaw resistance.