bluuebunny/crossref_metadata_2025 huggingface dataset:
OpenBIM Framework for a Collaborative Historic Preservation System
Authors: O'Keeffe Shawn E.
Published: June 2017

The authors have developed a novel system framework for a historic preservation system utilising open standards and open source tools. The framework enables the integration of open standard 3D models and GIS in a virtual environment (VE). It also allows the storage and harvesting of data via an open source web-based central repository. The framework is designed for bi-directional interoperability when utilised for monument tracking, preservation, conservation, re-excavation, etc. To date, no such system framework exists for the development and management of historic monuments using open standards e57 for terrestrial laser scanning (TLS) data, the industry foundation classes (IFC) for 3D semantic rich models, and CityGML for integrating IFC and GIS in a VE. The web-based VE is accessed from the BimServer and envisaged for monitoring monument erosion, movement, and damage to monuments by human activity or nature, collaboration between different industry actors to share knowledge, experience, and expertise globally, etc.
Time and Space Reasoning for Ambient Systems
Authors: Boukharrou Radja Radja , Ilié Jean-Michel , Saidouni Djamel Eddine
Published: June 2017

This paper presents an algebraic language, called Time-AgLOTOS, to describe time-dependent behavior of intelligent agent for the design of Ambient Intelligence systems. This specification model provides a theoretical foundation for performing planning under timing constraints. Based on a true-concurrency semantics, a contextual model, called Spatio-Temporal Planning System (STPS), is developed to capture all possible evolutions of an agent plan including context changes. The STPS provides formal description of possible actions to perform supporting timing constraints, action duration and spatial information. This structure offers new possibilities and strategies for taking agent real-time decisions in context-awareness manner.
The Relentless Memorial
Authors: Rosburg Regan Suzanne
Published: June 2017

This manuscript, per the author, will explain “Environmental Melancholia” and “Collective Social Mania,” and describe how they are connected in a hedonic loop of capitalism and buyer's remorse. This manuscript will also explain the role of symbolism and symbolic acts in healing one's grief, and the connection it has to art. The materials used in the artwork, Relentless Memorial, reference the unyielding pollution and mass production of goods created by the petroleum industry, as well as creating a dichotomy between a clean, white, virgin plastic to an ever-increasingly polluted, contaminated world. The formal presentation of Relentless Memorial as an installation is intended to provide a place of contemplation and mourning. Furthermore, the presentation of the installation as a panorama is related to the phenomenon of panoramas of the nineteenth century, and the onset of environmental pollution during the industrial revolution of that time. It invites a layered investigation into how that industry has influenced the environmental melancholia felt by society today.
Performance Analysis of Anisotropic Diffusion Based Colour Texture Descriptors in Industrial Applications
Authors: Hiremath Prakash S. , Bhusnurmath Rohini A.
Published: June 2017

A novel method of colour texture analysis based on anisotropic diffusion for industrial applications is proposed and the performance analysis of colour texture descriptors is examined. The objective of the study is to explore different colour spaces for their suitability in automatic classification of certain textures in industrial applications, namely, granite tiles and wood textures, using computer vision. The directional subbands of digital image of material samples obtained using wavelet transform are subjected to anisotropic diffusion to obtain the texture components. Further, statistical features are extracted from the texture components. The linear discriminant analysis is employed to achieve class separability. The texture descriptors are evaluated on RGB, HSV, YCbCr, Lab colour spaces and compared with gray scale texture descriptors. The k-NN classifier is used for texture classification. For the experimentation, benchmark databases, namely, MondialMarmi and Parquet are considered. The experimental results are encouraging as compared to the state-of-the-art-methods.
A E-Business Case of Study
Authors: Vargas-Vera Maria , Salles Camilo , Parot Joaquin , Letelier Sebastian
Published: June 2017

The main purpose of this research was to find relations between the chemical composition of the wines and the wine testers' opinions on the wine quality. We used in our study a dataset which contains examples of red wine from Vinho Verde, Portugal. Firstly, we did an analysis on the attributes of the examples, in the dataset, to find correlations between quantitative and qualitative properties in wines. Secondly, we performed clustering using the algorithms k-means and x-means. Additionally, we used the J48 algorithm for getting a decision tree and then to extract first order logic rules. We concluded that, there is a relation between physicochemical properties and quality of wines. This result opens the possibility of further analysis and perhaps this could lead to use fewer wine testers and therefore, our research could bring benefit to the wine industry.
Leveraging Temporal Markers to Detect Event from Microblogs
Authors: Cherichi Soumaya , Faiz Rim
Published: June 2017

One of the marvels of our time is the unprecedented development and use of technologies that support social interaction. Social mediating technologies have engendered radically new ways of information and communication, particularly during events; in case of natural disaster like earthquakes tsunami and American presidential election. This paper is based on data obtained from Twitter because of its popularity and sheer data volume. This content can be combined and processed to detect events, entities and popular moods to feed various new large-scale data-analysis applications. On the downside, these content items are very noisy and highly informal, making it difficult to extract sense out of the stream. Taking to account all the difficulties, we propose a new event detection approach combining linguistic features and Twitter features. Finally, we present our system that aims (1) detect new events, (2) to recognize temporal markers pattern of an event, (3) and to classify important events according to thematic pertinence, author pertinence and tweet volume.
Multiobjective Transportation Problem Using Fuzzy Decision Variable Through Multi-Choice Programming
Authors: Maity Gurupada , Roy Sankar Kumar
Published: June 2017

This paper analyzes the study of Multiobjective Transportation Problem (MOTP) under the consideration of fuzzy decision variable. Usually, the decision variable in a Transportation Problem is taken as real variable. But, in this paper, the decision variable in each node is selected from a set of multi-choice fuzzy numbers. Inclusion of multiple objectives into transportation problem with fuzzy decision variable makes it a Multiobjective Fuzzy Transportation Problem (MOFTP). In this paper, a new formulation of mathematical model of MOFTP with fuzzy goal of each objective function is enlisted. Thereafter the solution technique of the formulated model is described through multi-choice goal programming approach. Finally, a numerical example is presented to show the feasibility and usefulness of this article.
The Traffic Sign as A Sign
Authors: Nuessel Frank
Published: June 2017

This essay has a five-fold purpose: (1) To define the term 'sign' and its referents; (2) to comment on semiosis and representation; (3) to discuss visual signs; (4) to use selectively traffic signs (regulatory, warning) to exemplify how these metal objects placed on highways provide motorists with visual guidance on traffic rules and traffic advisories; and (5) to show how traffic signs constitute a silent visual expression of Searle's directive and representative (assertive) illocutionary acts.
The Dialogues of Bernie Madoff's Ponzi Fraud
Authors: West Joel
Published: June 2017

Bernie Madoff defrauded billions of dollars from his victims. The crime of fraud and the so called sin of greed have been with us throughout known human history. Instead of looking at mere greed as the cause for fraud, this retrospective of Bernie Madoff's fraud will examine the other reasons why, despite multiple warnings and red flags, smart savvy people who had been advised otherwise, still invested with Madoff. The culture of secrecy that Madoff constructed is deconstructed and explained as creating community. As well, the first person account of an academic who specializes in mental lapses, and who invested with Madoff, is given a textual analysis and some lapses are revealed and discounted.
The Reincarnation of the Aura
Authors: Bigliardi Victoria
Published: June 2017

In 1935, Walter Benjamin introduced the aura as the abstract conceptualization of uniqueness, authenticity, and singularity that encompasses an original art object. With the advent of technological reproducibility, Benjamin posits that the aura of an object deteriorates when the original is reproduced through the manufacture of copies. Employing this concept of the aura, I outline the proliferation of plaster casts of sculptures in 18th- and 19th-century Europe, placing contextual emphasis on the cultural and prestige value of originals and copies. Theories of authenticity in both art history and material culture are used to examine the nature of the aura and to consider how the aura transforms when an original object is lost from the material record. Through an object biography of a 15th-century sculpture by Francesco Laurana, I propose that the aura does not disappear upon the loss of the original, but is reincarnated in the authentic reproduction.
Personalized Chunk Framework for High Performance Personalized Web
Authors: Shailesh K S , Venkata Suresh Pachigolla
Published: June 2017

Dividing the web site page content or web portal page into logical chunks is one of the prominent methods for better management of web site content and for improving web site's performance. While this works well for public web page scenarios, personalized pages have challenges with dynamic data, data caching, privacy and security concerns which pose challenges in creating and caching content chunks. Web portals has huge dependence on personalized data. In this paper the authors have introduced a novel concept called “personalized content chunk” and “personalized content spot” that can be used for segregating and efficiently managing the personalized web scenarios. The authors' experiments show that performance can be improved by 30% due to the personalized content chunk framework.
Nacionalização e ensino de história em Santa Catarina na primeira metade do século XX
Authors: Otto Claricia
Published: June 2017

Este artigo tem por objetivo identificar a influência e a inter-relação das políticas e teorias educacionais do Estado nacional, nos discursos sobre qual história ensinar e para que ensinar, em Santa Catarina, na primeira metade do século XX. Pretende-se, principalmente, focalizar a inter-relação entre a história a ser ensinada e a nacionalização, haja vista a centralização do governo federal voltada para tal finalidade, seja na administração, nos programas e na fiscalização. Do Ministério da Educação provinham instruções de combate às diferentes manifestações de culturas estrangeiras existentes no Brasil, especialmente os usos da língua e o ensino da história e da geografia dos países de onde os diferentes grupos étnicos haviam emigrado. As fontes documentais são constituídas por material bibliográfico, especialmente discursos de obras de Jonathas Serrano, um dos porta-vozes de determinada concepção de história do período e um dos formuladores de discursos e programas da política oficial, recortes da legislação educacional e relatórios de inspetores escolares.
História da Educação na Pós-Graduação em Educação da UEPG (1994-2015)
Authors: Campos Névio De , Skalinski Junior Oriomar , Cordova Maria Julieta Weber
Published: June 2017

Este artigo toma como objeto o lugar da História da Educação como campo de pesquisa na Universidade Estadual de Ponta Grossa (UEPG), entre os anos de 1994 e 2015. Na avaliação desse campo, buscamos, para além de uma reconstituição de ideias, examinar sua trajetória e presença institucionais, objetivadas em diferentes âmbitos da universidade. Destaca-se, dentre esses elementos, a implantação do Programa de Pós-Graduação em Educação, em 1993/1994, como um importante marco que possibilita retratar a história da pesquisa em História da Educação, conforme ocorreu na instituição. Em sua trajetória, o lugar da História da Educação na UEPG – no âmbito da pesquisa – passou da condição de linha, existente entre os anos de 1994 e 2000, para a de projeto isolado, de 2000 a 2003, e, ainda como um terceiro desdobramento, de 2003 até o presente momento, passou a fazer uma composição, formando uma linha associada ao campo de estudo das Políticas Educacionais. As pesquisas em História da Educação na UEPG, embora estejam presentes desde o nascimento do mestrado, revelam-se como uma presença ainda tímida, em razão de dificuldades existentes para sua expansão, especialmente, as ligadas ao número reduzido de professores com vinculação ao campo na instituição.
Electromyographic evaluation of the lower limbs of patients with Down syndrome in hippotherapy
Authors: Ribeiro Mariane Fernandes , Espindula Ana Paula , Ferreira Alex Abadio , Souza Luciane Aparecida Pascucci Sande de , Teixeira Vicente De Paula Antunes
Published: June 2017

Hippotherapy is a therapeutic method that uses the horse’s movement to achieve functional results in practitioners with Down syndrome (DS), who present motor and neurophysiological changes that affect the musculoskeletal system. Evaluating the motor behavior related to the control and the improvement of muscle activation in practitioners with Down syndrome subjected to hippotherapy. 10 practitioners were divided into two groups: Down Group (DG) – practitioners with DS, and Healthy Group (HG) – practitioners with no physical impairment. The muscles gluteus medius, tensor fasciae latae, rectus femoris, vastus medialis, vastus lateralis, biceps femoris, tibialis anterior and gastrocnemius were evaluated by electromyography using gross RMS values, which correspond to muscle activation; the evaluations were performed on the 1st and 10th hippotherapy sessions (frequency: once a week), and after 2 months interval without treatment, they were performed on the 1st and 10th hippotherapy sessions (frequency: twice a week). It was noted that activation of the studied muscles increased with the passing of sessions, regardless the weekly frequency of attendance; however, the period without treatment resulted in reduction of this effect. Practitioners with DS presented satisfactory changes in muscle activation pattern, in learning and in motor behavior during hippotherapy sessions.
Aerobic capacity, physical activity and pain in adult victims of moderate to severe burns after discharge
Authors: Itakussu Edna Yukimi , Valenciano Paola Janeiro , Fujisawa Dirce Shizuko , Anami Elza Hiromi Tokushima , Trelha Celita Salmaso
Published: June 2017

Burns cause different impacts on the individual life. Many are the problems faced by survivors, such as hypermetabolism that may persist years after the event. The aim was to assess aerobic capacity, level of physical activity and pain in adult burn victims after hospital discharge. This is a descriptive, cross-sectional study. Participants (n = 60) were adult victims of moderate to severe burns, evaluated by six-minute walk test (6MWT), Pain Scale and International Physical Activity Questionnaire (IPAQ). We applied Student’s t-test for independent samples and Mann-Whitney test for comparisons between medium and large burned; Chi-square test to compare the level of physical activity. Large burned (73%) patients prevailed among the 60 participants; there was a statistically significant trend in the distance predicted between groups (p = 0.066), with no change in performance of the aerobic capacity. 60% reported physical activity practice at least three times a week: walking, cycling and soccer. As for the level of pain, 40% reported moderate to severe persistent pain, even after complete healing of wounds. Most participants showed aerobic capacity within the normal range, despite the high body mass index reported, they reported doing physical activities of moderate intensity.
Changes in social function and body image in women diagnosed with breast cancer undergoing chemotherapy
Authors: Garcia Sabrina Nunes , Coelho Raquel De Castro Figueiredo Pereira , Santos Pamella Naiana Dias dos , Maftum Mariluci Alves , Mantovani Maria De Fátima , Kalike Luciana Puchalski
Published: June 2017

The objective of this study was to investigate the impairment of social and emotional functions, body image and future perspective in women with breast cancer undergoing chemotherapeutic treatment. This is a longitudinal research conducted from October 2012 to October 2013 at the chemotherapy unit of a private institution of Oncology located in Curitiba, PR, Brazil. Sociodemographic and clinical questionnaires were applied, Quality of Life Questionnaire Core 30 e Quality of Life Questionnaire – Breast Cancer Module, to 48 women subjected for the first time to chemotherapy, in three different stages of the treatment. Analysis with Friedman`s, Spearman and Kruskal-Wallis nonparametric tests was performed. Changes were observed in social function and body image, which compromised quality of life significantly. Results can subsidize the planning of and adjustments to the care provided to these women by considering the perception about the impact of therapy on QL and their perspectives.
The impact of the quality of life perception on the self-esteem of physically active adults
Authors: Oliveira Daniel Vicentini de , Nascimento Júnior José Roberto Andrade do , Codonhato Renan , Zamboni Thayna Da Silva , Santos Adriele Tarini dos , Vieira Lenamar Fiorese
Published: June 2017

This study aimed at investigating the impact of the quality of life perception on the self-esteem of physically active adults. A total of 63 male and female swimming practitioners (38.13 ± 11.72) were evaluated. A socio-demographic questionnaire, WHOQOL-Bref Scale, and the Rosenberg Self-Esteem Scale were used as tools. For data analysis the descriptive statistics, Kolmogorov-Smirnov Test, Mann-Whitney U Test, Spearman’s Rank Correlation Coefficient, and the Univariate Multiple Regression were used. No significant differences were found either for the quality of life or the self-esteem between sexes; there was a significant positive correlation (p < 0.05) among the physical (r = 0.37), psychological (r = 0.36) and environmental (r = 0.30) domains with self-esteem. The regression model explained 20% of the self-esteem variability, with moderate and significant pathways of the physical (β = 0.23) and psychological (β = 0.23) domains, whereas the environmental domain did not show a significant predictive relation (p = 0.988) with self-esteem. It is concluded that a higher quality of life perception may result in a higher self-esteem for physically active adults.
Polarização e população: apontamentos teóricos
Authors: Stamm Cristiano , Lima Jandir Ferrera de , Santos Manoela Silveira dos
Published: June 2017

O objetivo deste artigo é discutir teoricamente o movimento pendular da população sob a ótica da teoria dos polos de crescimento e desenvolvimento. As transformações e a expansão urbana ocorrida como as novas formas de moradias, as alterações na composição familiar e a inserção da mulher no mercado de trabalho constituem elementos importantes para a interpretação das alterações demográficas e socioeconômicas que afetam o fenômeno da polarização e o movimento pendular da população. O movimento pendular está relacionado aos trabalhadores e estudantes que despendem grande parte de suas horas diárias perfazendo trajetos intermunicipais para o trabalho ou estudo. A modificação espacial da localização da população, da estrutura urbana e do papel político e econômico dos espaços frente à economia nacional e internacional traz a tona problemas urbanos relacionados à mobilidade populacional. O distanciamento entre o local de residência e das atividades econômicas faz com que o recrutamento da mão de obra dos diversos setores das atividades não se limite somente as aglomerações afetando o perfil da polarização no espaço econômico.
Editorial
Authors: Sita Patrícia Coradim , Vicentini Max Rogerio
Published: June 2017

Editorial do Volume 39(1) de 2017.
Microstructure Characterization of AZ31B Mg Alloy Welds Processed by Nd:YAG Laser Welding
Authors: Liu Hong Tao , Wang Ruo Chao , Liu Qing , Zhou Ji Xue , Chen Yan Fei , Ma Bai Chang , Yang Yuan Sheng
Published: June 2017

The Nd:YAG laser welding process of AZ31B alloys was performed by using the six-axis robot in this work. The microstructure characterization of AZ31B auto-welded joints was studied by using scanning electron microscope (SEM) and energy dispersive spectrometer (EDS). The laser welding process resulted in the formation of equiaxed grains in the center of the fusion zone (FZ) and columnar grains near the FZ boundary, meanwhile some eutectic β-Mg17Al12 particles were observed in the microstructure. No clear heat affected zone (HAZ) was observed in the welded AZ31B joint. Furthermore, some pores were observed in the base material (BM) and FZ.
Fracture and Crack Propagation Behavior of 560 MPa Microalloyed Pipeline Steel under Different Cooling Schedules
Authors: Zhao Jin Hua , Li Dong Fang , Yuan Guo , Wang Xue Qiang , Li Rui Hao , Kang Jian , Di Hong Shuang
Published: June 2017

Three kinds of pipeline steel with different microstructures were fabricated by varying cooling schedules during thermo-mechanical controlled processing (TMCP). Charpy impact property of the pipeline steels were obtained, and the fracture and crack-arrest mechanisms were further studied. The results indicated that the steels were classified into two kinds according to their microstructures, the mixture of acicular ferrite (AF), quasi-polygonal ferrite (QF), granular bainite (GB) and small fraction of degenerate pearlite (DP), and the mixed microstructure of AF and GB, respectively. The processed steel with microstructure of AF and GB exhibited more excellent low-temperature toughness and crack-arrest properties with upper shelf energy of ~281 J and energy transition temperature of ~-76°C. The mixed microstructure (AF + GB) possessing smaller effective grain size hindered the propagating of crack and consumed large amount of energy during fracture. The effective grain size of microstructure was the dominant factor controlling low-temperature toughness and crack-arrest properties of pipeline steel, which increased the high-angle boundary length per unit area and further increased the crack propagation energy during fracture.
Grain Refinement Mechanism and Effective Nucleation Phase of Al-5Ti-1B Master Alloy
Authors: Wang Shun Cheng , Li Ji Lin , Gan Chun Lei , Zheng Kaihong
Published: June 2017

The Al-5Ti-1B, Al-10Ti, Al-4B master alloys and TiB2 powder were applied to refine the pure aluminum, respectively. The effects of the TiAl3 phase, TiB2 particle, and AlB2 phase on the grain size of pure aluminum were compared. The grain refinement mechanism of the Al-5Ti-1B grain refiner was studied. The results showed that the TiAl3 phase was an effective heterogeneous nucleus of the α-Al grain. But the TiAl3 phase in the Al-5Ti-1B grain refiner was not the heterogeneous nucleus of the α-Al grain due to its re-melting in the Al melt. The separate TiB2 particle or AlB2 phase was not the heterogeneous nucleus of the α-Al grain. However, the TiB2 coated by the TiAl3 phase can be the effective heterogeneous nucleus of the α-Al grain. The grain refinement mechanism of the Al-5Ti-1B grain refiner can be summarized as follows: when the Al-5Ti-1B grain refiner is added into the Al melt, the TiAl3 phases are re-melted to release the Ti atoms, while the TiB2 particles are remaining in the Al melt. During the solidification of the Al melt, the Ti atoms are segregating on the surface of TiB2 particles to form the TiAl3 phases. The TiB2 particles coated by the TiAl3 phases then reacts with the Al melt to generate α-Al crystal nucleus.
Influence of Post Heat Treatment on Microstructure and Mechanical Property of Ti6Al4V Parts Produced by Selective Laser Melting
Authors: Ding Hong Yu , Qiu Pei Kun , Han Yuan Fei , Sun Zhong Gang , Huang Jie , Chu Ming Qiang , Lu Wei Jie
Published: June 2017

A preliminary investigation of the post heat treatment for Ti6Al4V tensile specimens fabricated via selective laser melting (SLM) are reported. The resultant microstructure and mechanical behavior at room temperature, normal and parallel to the building direction, was investigated in detail. Moreover, the as-prepared samples were compared with the samples post heat treated at 600°C~800°C for 2 h. It was found that the SLM fabricated samples consisted of long columnar original β grains together with parallel acicular α' martensitic structure dominated in the β matrix, which was observed in the side view, and fully equaixed β grains pattern in the top view. The post heat treatment did not completely disrupt the layered structure, but leading to the acicular α' martensites decomposing into α platelets distributed in a metastable β matrix. Ultimate tensile strength and elongation were analyzed and explained based on the microstructure evolution. After post heat treatment, an increase in elongation was observed for the tensile samples, inducing more ductile like morphology after fracture.
Effects of La Doping on Microstructure and Ferroelectric Properties of BLTN Lead-Free Ceramics
Authors: Shao Na Na , He Xi Yun , Sun Da Zhi , Xia Bin , Zeng Xia , Cheng Wen Xiu , Qiu Ping Sun , Pan Yu Bai
Published: June 2017

Lead-free EO ceramics have been received increasing attentions from the view point of green environment in recent years. In this study, lead-free Ba6-1.5xLaxTi2Nb8O30 (0≤x≤7%) ceramics were synthesized by the conventional solid state reaction sintering method. The effects of lanthanum doping on the microstructure and electrical properties of Ba6Ti2Nb8O30 (BTN) ceramics were investigated and analyzed. The XRD results revealed that the lanthanum doping changed the BTN lattice parameters slightly. The sample grain size, dielectric constants (1kHz) and the temperature Tm gradually decreased with the increasing of lanthanum doped content. The optimized BLTN ceramic sample with x=4 mol % exhibited a good transparency and excellent electrical properties (Ps=6.41 μC/cm2, Pr=0.77 μC/cm2, and Ec=3.80 kV/cm).
Surface Modification of Graphene Oxide with Pyrene Derivatives and their Photo-Switching Behaviors
Authors: Lv Shi Sheng , Bian Lin , Qiu Jian Xun , Zhang Xin Tao , Gao Ming Jun , He Xiao Chun , Ma Xing Fa , Li Guang
Published: June 2017

The characteristics of surface and interface of nanocomposites are favor for exerting some functional properties and widening new applications. Some low-dimensional materials generally have abundant chemical groups and reaction activities. These surface chemical groups of nanomaterials provide a large platform to develop new nanocomposites and applications by surface chemical reaction and surface reconstruction of another kind of materials. Among so many hot-fields materials, graphene and its nanocomposite are developed rapidly. The graphene oxide not only has good charge transferring property, but also has abundant chemical groups on its surface, such as, -COOH, -OH and epoxide group. Therefore, graphene oxide is a good candidate substrate for further constructing other functional materials in nanoscale. The graphene oxide and pyrene derivatives were selected as representative materials for studies. Assembly of pyrene containing –NH2 groups on the surface of graphene oxide was carried out. A series of characterizations were performed by SEM (scanning electron microscopy), TEM (transmission electron microscopy), the FTIR (Fourier-Transform Infrared ) spectra, The UV-Vis (Ultra-violet visible spectroscopy), photoluminescence spectra, et al. The results indicated that the UV-Vis of nanocomposite was almost covered the whole region of visible light, and the results of PL showed strong fluorescence quenching. There was strong interaction between the graphene oxide and pyrene. The photoconductivity response to weak visible light and 808 nm laser were studied based on interdigital electrodes of Au on flexible PET(polyethylene terephthalate) film substrate with casting method. The results showed that graphene oxide modified with pyrene derivatives exhibited that the photocurrent increased obviously to visible light, and photoresponse to weak 808 nm laser emerged photo-switching behavior. It would be developed the light detector to NIR, biomimetic fields or external stimuli driven nanocarriers for biomedical fields, et al.
Putting Cement to Sleep with Sucrose and Waking it up with Ca(OH)2
Authors: Pang Xiao Fan , Wang Zi Ming , Shen He Qing , Xue Long
Published: June 2017

In this work, the effects of sucrose on setting time, heat of hydration and hydration products were studied, and the corresponding hydration process and regulation mechanism were discussed. With the adsorption test of sucrose on Ca (OH)2 suspensions, the “wake up” mechanism of Ca (OH)2 on sucrose-retarded cement was discussed. The results indicate that sucrose is used as retarder to increase the dormant period by adsorption to the cement surface, but there exists a critical amount of sucrose. And the XRD patterns indicate that sucrose can accelerate the reaction of C3A and the formation of AFt, but restraint the hydration of C3S. Ca (OH)2 that was used as accelerator in this paper can adsorb the sucrose up to 6.2mg sucrose/g Ca (OH)2. The combined-use of sucrose and Ca (OH)2 does not change the shape of the heat rate curves significantly. And the dormant period of sucrose-retarded cement can be decreased with the doses of Ca (OH)2 increasing, because of its high surface and preferential adsorption of sucrose.
Properties of the Concrete for the Slab Ballastless Track of CRTS III
Authors: Li Xiao Rong , Huang Xing Qi , Zhang Da Wei , Xue Chang Jun , ZHANG A.Q.
Published: June 2017

Experimental research was conducted using concrete produced by adding the polycarboxylic-type water-reducing agent. The cement, sand, aggregates, fillers and water-reducing agent were used as the important raw materials for the concrete. Then the following properties of the concrete were analyzed: compressive strength, elastic modulus and frost resistance. The compressive strength was 84 MPa at 56 days and the modulus of elasticity was 45.3 GPa at 28 days. Therefore, the water-reducing agent played an important role for the concrete. All the properties met the technical requirements of the CRTS III track plate.
Effect of Heat-Treatment on the Properties of PBO Fibers
Authors: Zhu Xiao Lin , Zhong Wei Hua , Jin Zi Ming , Zhang Peng , Guo Zhong Ren , Gong Ping , Qu Zhi Min
Published: June 2017

PBO fiber is a kind of super fibers which has both high tension strength and high modulus. After the heat-treatment procedure, the PBO fiber would present more perfect mechanical properties. The process route of heat-treatment on as-spun fibers (PBO-AS fibers) was optimized, and the obtained high modulus fibers (PBO-HM fibers) were tested and characterized by SEM, XRD, XPS, FT-IR and Universal material machine. The higher the temperature is, the shorter the heat treatment time required for the same heat treatment. And the most preferred procedure in the air atmosphere of heat-treatment was 550°C with the resident time of 32 s and the pre-stress of 2.35 cN/dtex. After the heat-treatment, the modulus of PBO-HM grew up to 229.4 GPa (1487.78 cN/dtex). The tensile strength would not be greatly decreased, if the fiber could be kept in the nitrogen atmosphere. Besides, the XRD data and the XPS data proved that after the heat-treatment, the crystal size and the crystallinity would have a huge growth and the content of phosphorus element on the surface of PBO-HM fibers would fall sharply.
Effects of Poly(Ethylene Glycol) Segment on Physical and Chemical Properties of Poly(Ether Ester) Elastomers
Authors: Xu Qiu Shu , Tang Lian , Wang Chao Sheng , Wang Biao , Wang Hua Ping
Published: June 2017

Poly (ether ester) elastomer, a segmented copolymer, recently has attracted a wide attention for its unique properties such as elasticity, low temperature impact resistance and chemistry resistance. In this work, a range of poly (ether ester) s were synthesized via a two-step polymerization method using poly (ethylene terephthalate) (PET) as rigid segment and poly (ethylene glycol) (PEG) as flexible segment. The effects of the molecular weight (1000-8000 g/mol) and the weight ratios with PEG (30/100-70/100) of PET segments on the performance of synthetic copolymers were investigated. The chemical structure, thermal properties and hydrophilic performance of the copolymers were respectively characterized. Additionally, the practical block ratios of PEG/PET were calculated by the 1H-NMR Spectra of the copolymer after Soxhlet extraction. Through the obtained results, it revealed that increasing the molecular weight or content of PEG could enhance the hydrophilic performance of the copolymers and reversely reduce its thermal stability. It was shown that the reactivity of PEG in the polymerization process was weakened when its molecular weight was above 4000 or weight ratio with PTA was higher than 60/100, subsequently affected the practical block ratios of PEG/PET in the resulting poly(ether ester)elastomers.
Dynamic Recrystallization of Mg-8Gd-3Y-1Nd-0.5Zr Alloy during Hot Deformation
Authors: Qi Hong Na , Zhang Zhi Min , Yu Jian Min , Yin Xue Yan , Du Zhi Yuan
Published: June 2017

Uniaxial hot compression was conducted on Gleeble-3500 thermo simulation machine. Based on stress-strain curves, the constitutive relationship and the dynamic recrystallization kinetics model of Mg-8Gd-3Y-1Nd-0.5Zr were established. Simultaneously, dynamic recrystallization mechanism of this alloy under different deformation condition was investigated by SEM, EBSD and OM. The critical strain equation and the dynamic recrystallization kinetics model were obtained. The results showed that the dynamic recrystallization volume fraction increased with the increasing of the strain.The twin dynamic recrystallization (TDRX) was the mainly DRX mechanism at 350°C;the dynamiac recrysallization mechanism was dominated by continuous dynamic recrystallization (CDRX) at 400°C and 450°C. At higher temperature (500°C), the dynamic recrystallization was dominated by discontinuous dynamic recrystallization (DDRX) with a small amount of CDRX.
Influence of Precipitation Hardening on the Sliding Wear Behavior of a Cu-Zn-Al-Mn-Si Based Brass Alloy
Authors: Li Hang , Liu Shi Chao , Jie Jin Chuan , Li Ting Ju
Published: June 2017

Special brasses containing Mn and Si possess high wear resistance due to the dispersion of hard Mn5Si3 particles. The effect of precipitation hardening on the wear resistance of a Cu–30Zn–3Al–3Mn–0.7Si based brass alloy was investigated. Dry sliding wear test was conducted using a block-on-ring configuration. The results indicated that finely, nanoscale Mn5Si3 particles precipitated from the matrix after annealing at 800 °C for 4 h, resulting in the increase of hardness from 240 to 278 HV. Both the wear loss and friction coefficient decreased, indicating the improvement of the wear resistance. From the examination of the worn surfaces, adhesive and abrasive wear were found to be the major wear forms. The adhesion and abrasion decreased after the precipitation-hardening treatment.
AlCrFeNi High-Entropy Coating Fabricated by Mechanical Alloying and Hot Pressing Sintering
Authors: Shang Cai Yun , Wang Yan
Published: June 2017

The AlCrFeNi high entropy coating was successfully prepared by mechanical alloying and vacuum hot pressing sintering technique on Q235 steel substrate, and the microstructures and microhardness, wear resistance and corrosion resistance were characterized in detail. Results showed that single body-centered cubic solid solution phase appears when the blended powder is ball milled for 30 h. The vacuum hot pressing sintered AlCrFeNi high entropy coating with single BCC solid solution is about 500 μm in thickness, which metallurgically bonded to substrate. The microhardness of the AlCrFeNi high entropy coating is about 520 HV, more than three times larger than that of the substrate. The wear resistance and corrosion resistance of the coating in 3.5% NaCl solution are greatly improved compared with the substrate, showing a dramatic reduction in average corrosion rate and wider passive range.
Effect of B2 Phase Transformation on the Mechanical Behavior of CuZr-Based Bulk Metallic Glass Composites
Authors: Wei Ran , Tao Juan , Liu Shi Lei , Sun Guo Wen , Guo Shuai , Li Fu Shan
Published: June 2017

The mechanical behavior of CuZr-based bulk metallic glass composites with different B2-CuZr phase transformation ability was investigated. The B2 phase transformation is conducive to enhance the mechanical properties of CuZr-based bulk metallic glass composites. The mechanical properties of the austenitic B2 phase specimens were also studied to understand the mechanism of phase transformation effect. It was found that the B2 phase with martensitic transformation exhibits lower yield strength and stronger work-hardening capability than the B2 phase without martensitic transformation. Thus, the phase transformation effect of B2-CuZr phase, accompanying with its lower yield strength and stronger work-hardening capability, is the main reason for the CuZr-based bulk metallic glass composites possess outstanding mechanical properties.
Effect of Precipitates on Austenite Grain Growth Behavior in a Low-Carbon Nb-V Microalloyed Steel
Authors: Zhang Li Chong , Wen Xin Li , Liu Ya Zheng
Published: June 2017

The effect of precipitates on austenite grain growth behavior in a Nb-V microalloyed steel was investigated. The precipitates were identified by selected area electron diffraction (SAED) and energy dispersive spectrometer (EDS) analysis. Because of pinning effect of NbC and/or VC on austenite grain boundaries, grains grew slowly at 850oC-1000oC. However, when temperature reached 1050 oC, abnormal grain growth was observed, which was attributed to dissolution of NbC particles. The NbC precipitates dissolved significantly at 1150 oC. However, grain sizes were still very small. Thus, austenite grains grew rapidly at 1050-1150 oC. The fully dissolution temperature of this steel was 1150-1250oC. Finally, the relationship between grain coarsening temperature (TGC) and fully dissolution temperature (TDISS) could be illustrated as follows: 100 oC≤TDISS -TGC≤200 oC. When heating temperatures were 850-1050 oC and 1050-1250 oC, grain growth activation energies (Q) were 59945 J/mol and 135813 J/mol, respectively. The different grain growth models were mainly caused by the gradual dissolution of NbC particles.
Progress on Preparation, Microstructure and Property of Graphene Reinforced Aluminum Matrix Composite
Authors: Wang Yong , Zhou Ji Xue , Cheng Kai Ming , Wu Jian Hua , Yang Yuan Sheng
Published: June 2017

Graphene with unique two-dimensional structure and excellent mechanical properties, is one of the most ideal reinforcements. With the increasing progress of aluminum matrix composites, graphene reinforced aluminum matrix composites have attracted great interests. This paper mainly reviews the latest progress on preparation of graphene reinforced aluminum matrix composites, and especially discusses the effective dispersion technique of graphene. Meanwhile, the microstructure and interfacial structure of graphene reinforced aluminum matrix composites are also emphasized and discussed. The results showed that graphene can significantly improve the mechanical properties of composites and refine the matrix grain. By controlling preparation parameters, the graphene agglomeration can be effectively solved, and the adverse interface reaction between graphene and substrate can be avoided. Finally, the current challenges and solutions of graphene reinforced aluminum matrix composites were presented.
Diffusion Bonding in Fabrication TA2 Sheets Enhanced Aluminum Foam Sandwich
Authors: An Yu Kun , Yang Si Yi , Zhao Er Tuan , Huang Xu
Published: June 2017

Aluminum foam sandwiches (AFSs) served as sheet materials have enormous marketing potential for their interesting combinations of excellent properties, such as low density, high specific strength, energy absorption and thermal insulation. In this paper, transient liquid phase (TLP) bonding method was used to prepare pure titanium sheet enhanced AFS (TS-AFS). Fabricated TS-AFS with the dimension of 80×80×18 mm3 presented uniform foam core, and bubbles ranged from 0 mm to 2 mm occupied the most area of cross section. Thickness of interface layer increased with the increase in the holding time. Additionally, metallic compounds of Al20CaTi2 and Al2Ti were detected at the bonding joint.
PREVALENCE AND AETIOLOGY OF BACTEREMIA IN FEBRILE CHILDREN WITH SICKLE CELL DISEASE AT A NIGERIAN TERTIARY HOSPITAL
Authors: Brown Biobele Jotham , Dada-Adegbola Hannah O , Trippe Catherine , Olopade Olufunmilayo
Published: June 2017

Background & Objectives: As a result of immune defects in Sickle cell disease (SCD), affected individuals are prone to infection from encapsulated bacterial pathogens like Streptococcus Pneumoniae. Studies on the etiological agents of bacteremia in children with SCD in Nigeria are few and have revealed a spectrum of organisms that is different from those recorded in other parts of the world.  Aim and Objectives: The objectives of this study were to determine the prevalence of bacteremia, etiological agents and antibiotic susceptibility pattern in febrile children with SCD attending the University College Hospital (UCH), Ibadan, Nigeria.Methods: The study was cross-sectional and took place at the Department of Pediatrics of the UCH, Ibadan. Children with SCD, ages 0-17 years presenting with axillary temperature ≥ 380C were enrolled after obtaining informed consent.  History was obtained and complete physical examination performed after which blood was collected for culture and antibacterial susceptibility tests.Results: A total of 116 children were studied of which 69 (59.5%) were males, 111 (95.7%) were of the Hemoglobin SS phenotype and 5 (4.3%) of the Hemoglobin SC phenotype. Bacteremia was present in 16 (13.8%) of the 116 children. Gram negative bacteria constituted 10 (62.5%) of all isolates, while the predominant isolates were Klebsiella pneumonia 4, (25%) and Staphylococcus aureus, 4 (25%). Over 80% of the isolates were susceptible to Ceftriaxone, Amikacin and Meropenem.Conclusions Klebsiella pneumonia and Staphylococcus aureus are the predominant causes of bacteremia in children with SCD in Ibadan, contrary to findings in western countries.
Lenalidomide and temozolomide combination in a very elderly patient with CNS relapse of diffuse large b-cell lymphoma.
Authors: Cencini Emanuele , Fabbri Alberto , Arrigucci Umberto , Cerase Alfonso , Bocchia Monica
Published: June 2017

A 83 years old woman with CNS relapse occurred 6 months after chemoimmunoitherapy. The patient was defined ineligible for radiotherapy (RT) and started oral temozolomide 250mg daily for 5 consecutive days without any improvement after 1st cycle.We administer lenalidomide 25mg daily for 21 days every 28 days together with temozolomide 250mg daily for 5 days every 28 days. The patient experienced a rapid improvement of general and cognitive conditions; Gadolinium-enhnaced brain MRI showed a wide reduction of neoplastic tissue. The patients maintained good clinical conditions with mild treatment toxicity until the end of 6th cycle, when brain MRI showed disease progression and the patient died 1 month later.We suggest lenalidomide could be a feasible option for CNS relapse in elderly DLBCL patients and it could be associated in future studies with other cytotoxic agents such as temozolomide
Emerging cases of pertussis among early infants born to unvaccinated mothers, an infectious disease long absent in Northwestern Greece
Authors: Makis Alexandros , Grammeniatis Vasileios , Galati Charis , Kostara Panagiota , Petridou Evangelia , Gartzonika Constantina , Pappas Athanasios , Chaliasos Nikolaos
Published: June 2017

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Patterns of dental caries among school children assessed using Caries Assessment Spectrum and Treatment tool
Authors: Batawi Hisham El , Fakhruddin Kausar Sadia
Published: June 2017

Objective: The present study aimed to assess and monitor patterns of dental caries among primary and permanent molars using Caries Assessment Spectrum and Treatment (CAST) index and to evaluate integration of CAST tool into patient health information (PHI) system of a Teaching Dental Hospital. Materials and Methods: Dental records of n = 348 children, aged 7–9-years, attending University Dental Hospital Sharjah, for routine checkup and treatment as part of School Dental Program were assessed and translated into CAST codes. Dental caries prevalence for the second primary and first permanent molars were recorded. Spearman's correlation coefficient was used to assess the correlation of the status between primary and permanent molar. Results: CAST codes 0–2 were observed only in about 3% of primary and almost 5% in permanent dentition. The prevalence of children with diseased first permanent molar (codes 4–7) was almost 67%, while it was over 70% in second primary molars. A strong correlations were observed in the status between second primary and first permanent molars in the lower jaw on both right and left sides, r was 0.694 and 0.643 (P = 0.001), respectively. In the upper jaw, both right and left second primary molars revealed moderate correlation r = 0.435 (P ≤ 0.05) between disease stages with their neighboring permanent first molars. The unweighted kappa value for the intraexaminer reliability was 0.97 for second primary and 0.95 for first permanent molars. Conclusion: Our study recommends the integration of CAST tool in the PHI system where a simple numerical value can express clinical progress, overcome interruptions of treatment, and ensures continuity of patient care in teaching hospitals.
Hypochlorite solution for root canal irrigation that lacks a chlorinated odor
Authors: Vajrabhaya La-ongthong , Sangalungkarn Vanida , Srisatjaluk Ratchapin , Korsuwannawong Suwanna , Phruksaniyom Chareerut
Published: June 2017

Objectives: This is an in vitro study to develop a formulation of a hypochlorite solution for root canal irrigation that lacks a chlorinated odor. The antibacterial effect, tissue dissolution efficacy, and the cytotoxicity of the solution were assessed in cell culture and were compared with those of commercial sodium hypochlorite (NaOCl) solutions. Materials and Methods: Trichloroisocyanuric acid (TCA) was used as the source of hypochlorite ions in solution. All required properties of the NaOCl irrigant were evaluated and compared with those of original 2.5% NaOCl solutions currently in use. Results: Our results revealed that a TCA 3.5% + 1/6 Buffer-1 solution passed the short-term stability test. Moreover, no odor of chlorine gas was detected by three independent observers. The hypochlorite ion content and pH were stable over an incubation period of 4 weeks. The new solution did not differ from commercial products in terms of the dissolution property on bovine pulpal tissue (P > 0.05). Moreover, the antibacterial effect of this solution on Enterococcus faecalis did not differ from that of the commercial products (P > 0.05). In addition, our biocompatibility analysis demonstrated no difference among the tested solutions (P > 0.05). Conclusions: According to the results of all properties tested, TCA 3.5% + 1/6 Buffer-1 could be considered an option for NaOCl irrigation with the benefit of no detectable chlorine odor.