bluuebunny/crossref_metadata_2025 huggingface dataset:
Novel Ball-Type Dioxy-O-carborane Bridged Cobaltphthalocyanine: Synthesis, DFT Studies and Characterization for Dye-Sensitized Solar Cells as Photosensitizers
Authors: ŞENER Sevil
Published: September 2018

The synthesis and spectroscopic characterization of an innovative ball-type cobalt (II)  metallophthalocyanine 4, bridged by four 1,2-bis(2-hydroxymethyl)-O-carborane (HMOC) 1 units has been achieved. The structure of 4 was characterized via elemental analysis, UV–visible absorption spectroscopy, FT-IR spectroscopy, and MALDI-TOF mass spectrometry. The photovoltaic performance of the newly synthesized compound in dye-sensitized solar cells was investigated. In order to clarify the effect of dye-sensitization time on photovoltaic performance parameters, the sensitization time was varied from 12 to 60 h and the performance parameters were investigated. It was found that sensitization time had a strong effect on the main performance parameters. The best photovoltaic performance was achieved after sensitization for 36 h (short circuit current density, 6.41 mA cm−2; overall conversion efficiency, 3.42%). Geometry optimization of the molecule was performed using density functional theory and shows a peripheral structure.
Convective Instability in a Hele Shaw Cell with the Effect of Through Flow and Magnetic Field
Authors: Yadav Dhananjay
Published: September 2018

In this paper, an analytical investigation of the combined effect of through flow and magnetic field on the convective instability in an electrically conducting fluid layer, bounded in a Hele-Shaw cell is presented within the context of linear stability theory. The Galarkin method is utilized to solve the eigenvalue problem. The outcome of the important parameters on the stability of the system is examined analytically as well as graphically. It is observed that the through flow and magnetic field have both stabilizing effects, while the Hele-Shaw number has destabilizing effect on the stability of system. It is also found that the oscillatory mode of convection possible only when the magnetic Prandtl number takes the values less than unity.
Brain-Computer Interfaces for Internet of Things
Authors: Laport Francisco , Vazquez-Araujo Francisco J. , Castro Paula M. , Dapena Adriana
Published: September 2018

A brain-computer interface for controlling elements commonly used at home is presented in this paper. It includes the electroencephalography device needed to acquire signals associated to the brain activity, the algorithms for artefact reduction and event classification, and the communication protocol.
Notch and Breast Cancer Metastasis
Authors: Zhang Yu , Deng Huan
Published: September 2018

Metastasis is a major cause factor for breast cancer (BC)-associated mortality. During the metastatic process, disseminated tumor cells (DTCs) detach from the primary sites, and enter the bloodstream and establish the secondary colonies. Recent studies have provided substantial evidence for the importance of Notch signaling in BC metastasis. Therefore, this review focuses on the mechanisms by which Notch contributes to the origin of BC DTCs, increases their motility, regulates their intravasation and extravasation, protects them from host surveillance, and finally facilitates colonization. Identification of the mechanisms underlying Notch-related BC metastasis will lead to the development of novel Notch-targeted therapeutic strategies to reduce metastasis and significantly improve outcomes.
Quescin Sulfhydryl Oxidase 1 (QSOX1) Secreted by Lung Cancer Cells Promotes Cancer Metastasis
Authors: Sung Hye-Jin , Ahn Jung-Mo , Yoon Yeon-Hee , Na Sang-su , Choi Young-Jin , Kim Yong-in , Lee Soo-Youn , Lee Eung-Bae , Cho Sukki , Cho Je-Yoel
Published: September 2018

As lung cancer shows the highest mortality in cancer related death, serum biomarkers are demanded for the lung cancer diagnosis and its treatment. To discover lung cancer protein biomarkers, secreted proteins from primary cultured lung cancer and adjacent normal tissues from patients were subjected to LC/MS-MS proteomic analysis. Quescin sulfhydryl oxidase(QSOX1) was selected as a biomarker candidate from the proteins enriched in the secretion of lung cancer cells. QSOX1levels were higher in 82% (51 of 62 tissues) of lung cancer tissues compared to adjacent normal tissues. Importantly, QSOX1 serum levels were significantly higher in cancer patients (p<0.05, AUC=0.89), when measured by multiple reaction monitoring(MRM). Higher levels of QSOX1 are also uniquely detected in lung cancer tissues among several other solid cancers by immunohistochemistry. QSOX1 knock-downed Lewis lung cancer (LLC) cells was less viable from oxidative stress and had reduced migration and invasion. In addition, LLC mouse models with QSOX1 knock-down also proved that QSOX1 functions in promoting cancer metastasis. In conclusion, QSOX1 might be a lung cancer tissue-derived biomarker and involved in the promotion of lung cancers, and thus can be a therapeutic target for lung cancers.
Sustainable Activity of Cultural Service Consumers in Social Media - Influence on the Brand Capital of Cultural Institutions
Authors: Wróblewski Łukasz , Bilińska-Reformat Katarzyna , Grzesiak Mateusz
Published: September 2018

In the second decade of the 21st century, social media changed the nature of communication and cooperation between participants of the culture services market. They became, among other things, an important marketing instrument in the area of contact with the customers of the cultural offer. However, despite their growing importance in various areas of activity of organisations in the cultural sector, the issue of building the cultural institution's brand equity by social media users is relatively seldom raised. Research on the impact of online consumer activity on brand equity is at an early stage of development. Therefore, this article is an attempt to fill the research gap in this area. The article presents the results of a survey conducted in 2018 on a group of 1021 consumers of cultural services, who at the same time regularly used social media. The statistical analysis carried out and the research results obtained prove that the 3C sustainable system developed by the authors, concerning the activity of consumers of cultural services in social media, stimulates the consumer-based brand equity (CBBE). Statistically significant relations have been observed in particular for CBBE components related to the awareness of a cultural institution's brand and for the relationship related to the perception of its quality. The study opens a review of literature on social media and consumer-based brand equity (CBBE). Next, based on the COBRA model (consumer's online brand-related activities), a proposal of the 3C sustainable system, concerning the activity of consumers of cultural services in social media, has been presented. The further part of the article presents research hypotheses, a conceptual model, research methodology as well as results and conclusions. The last part of the article discusses the results obtained and indicates the existing management implications.
Risk Society and Anti-Politics in the Fracking Debate
Authors: Drake Frances
Published: September 2018

Fracking in the UK has yet to reach full industrial development but it is still subject to significant opposition. This study uses Beck’s Risk Society theory and anti-politics to examine the views voiced by opponents to fracking in Yorkshire, England. A qualitative approach was used; local newspaper reports were evaluated alongside semi-structured interviews with protesters to provide a thematic analysis. Although there are signs of post-materialist concerns with the environment these issues did not dominate the discussion. Scientists were not held responsible for the risks involved in fracking. Instead economic greediness of politicians and austerity measures were perceived as putting the environment and people’s health at risk. Interviewees thought fossil fuel energy production was economically advantaged over more sustainable energy and jobs in the low carbon economy. Protesters’ trust in politicians had been eroded but faith in democracy remained. It is suggested a citizen-led deliberative approach to all the concerns raised, not simply those relating to scientific risk, might achieve some level of resolution over fracking in the UK.
An Underactuated Prosthetic Hand with Coupled Metacarpophalangeal Joints
Authors: Ke Ang , Huang Jian , He Jiping ,   Neural Interfaces and Rehabilitation Technology Research Center, Huazhong University of Science and Technology No. 1037 Hongshan District, Wuhan, Hubei 430074, China,   Beijing Advanced Innovation Center for Intelligent Robots and Systems, Beijing Institute of Technology 5 South Zhongguancun Street, Haidian District, Beijing 100081, China
Published: September 2018

The design of a comfortable and functional prosthetic hand is still a challenge. This paper presents the design of a tendon-driven, 3D-printed, underactuated prosthetic hand. An improved structural design was developed to make the hand more flexible. Three fingers are equipped with abduction freedom at the metacarpophalangeal joints (MCP) to ensure natural enveloping for both cylinder and sphere-like objects. A force-sensing resistor (FSR) is adopted to measure the fingertip force of each finger. Experiments show that this type of structure design provides the hand with excellent dexterity, as the added abduction ensures natural enveloping grasp gestures for both cylinder and sphere-like objects. Moreover, a myoelectric control paradigm is implemented in the control system to demonstrate the feasibility.
A Filter of Minhash for Image Similarity Measures
Authors: Long Jun , Liu Qunfeng , Yuan Xinpan , Zhang Chengyuan , Liu Junfeng ,   School of Information Science and Engineering, Central South University Changsha City, Hunan Province 410083, China,   School of Computer, Hunan University of Technology Zhuzhou City, Hunan Province 412007, China
Published: September 2018

Image similarity measures play an important role in nearest neighbor search and duplicate detection for large-scale image datasets. Recently, Minwise Hashing (or Minhash) and its related hashing algorithms have achieved great performances in large-scale image retrieval systems. However, there are a large number of comparisons for image pairs in these applications, which may spend a lot of computation time and affect the performance. In order to quickly obtain the pairwise images that theirs similarities are higher than the specific thresholdT(e.g., 0.5), we propose a dynamic threshold filter of Minwise Hashing for image similarity measures. It greatly reduces the calculation time by terminating the unnecessary comparisons in advance. We also find that the filter can be extended to other hashing algorithms, on when the estimator satisfies the binomial distribution, such as b-Bit Minwise Hashing, One Permutation Hashing, etc. In this pager, we use the Bag-of-Visual-Words (BoVW) model based on the Scale Invariant Feature Transform (SIFT) to represent the image features. We have proved that the filter is correct and effective through the experiment on real image datasets.
Design of Fuzzy Logic Controller and its Distinctive Feature
Authors: Yamakawa Takeshi ,   Fuzzy Logic Systems Institute (FLSI) 1-5-204 Hibikino, Wakamatsu, Kitakyushu, Fukuoka 808-0135, Japan
Published: September 2018

Prof. Lotfi A. Zadeh, who created a new approach to describe a knowledge of a human expert with a natural language, passed away on September 6, 2017. His significant accomplishment was to create a novel artificial intelligence (AI) which exhibits the knowledge of human experts in natural linguistic terms. This system is structured and clear in two points of why a result is obtained and how it is done. The system contrasts with AI systems based on neural networks or deep learning.

In this paper, the design of a fuzzy logic controller and its application to controlling of the mouse-platform stabilization are described. In addition, the distinctive features of fuzzy logic control are discussed. The author wants to offer this paper on the altar of Prof. Zadeh.
The Harold Nix Site in Morris County, Texas: A Late Titus Phase Cemetery on Boggy Creek in the Big Cypress Creek Basin
Authors: Perttula Timothy
Published: September 2018

The Harold Nix site is an ancestral Caddo cemetery excavated in 1995 and 1996 by Ralph Nicholas and colleagues on land owned by Harold Nix on a sandy landform along a small tributary to Boggy Creek, itself a southward-flowing tributary to Big Cypress Creek, in Morris County, Texas. The site was discovered during backhoe work on the property in July 1975, and Mr. Nix asked Nicholas to excavate the cemetery. The exact location of the site is not known and a state trinomial has not been assigned the site at this time. Nicholas’ notes on the excavations and collections were turned over to Robert L. Turner, Jr., and he then turned those notes over to the Texas Archeological Research Laboratory at The University of Texas at Austin in August 1998, along with his notes and comments. These notes are employed herein to discuss the character of the ancestral Caddo cemetery, which apparently dates sometime between ca. A.D. 1550-1680 during the late Titus phase, and the associated funerary offerings in the 20 burial features.
Test Excavations and Additional Surface Collections at the Peach Orchard Site (41CE477) on Bowles Creek in Cherokee County, Texas
Authors: Perttula Timothy , Stingley Kevin
Published: September 2018

In March 2016, additional archaeological investigations were conducted at the Peach Orchard site (41CE477) in the Bowles Creek valley in Cherokee County, Texas. This is an area with numerous Historic Caddo Allen phase settlements, including the Peach Orchard site. Investigations at these sites have included pedestrian survey, systematic surface collections, intensive shovel testing, excavation of several 1 x 1 m units, and remote sensing. The ancestral Caddo sherd collection from the sites strongly suggest they are locations of post-A.D. 1680 Historic Caddo settlements, probably by the Neche or Nechas Caddo peoples. Patton Engraved sherds, the Allen phase fine ware ceramic type in the Neches River basin, are common in the site assemblages, and other aspects of the assemblage are consistent with Neche cluster sites. Perhaps these sites were settlements occupied by a Neche or Nechas Caddo group during the late 17th-early 18th century Spanish colonization of the middle reaches of the Neches River, yet inhabited before sustained French trading activities after ca. A.D. 1720, but when several missions were established in this general locale.

In this article we first discuss the March 2016 archaeological investigations at the Peach Orchard site. This is followed by a consideration of the analysis of the recovered artifacts in the work, and a review of the character of the Peach Orchard ceramic assemblage found at the site in several rounds of work.
YARGITAY KARARLARI IŞIĞINDA COĞRAFÎ MARKALAR
Authors: YILDIZ Burçak
Published: September 2018

Sınai Mülkiyet Kanunu’na göre; bir marka, ilişkin olduğu mal/hizmetin coğrafî kaynağını gösteriyorsa ya da bu konuda halkı yanıltıyorsa, söz konusu markanın tesciline izin verilmemektedir. Coğrafî markaların hangi durumlarda anılan tescil engelleri kapsamına gireceği hususu, özellikle yargı kararları ile şekillenmiştir. Çalışmamızda coğrafî markalara ilişkin tescil engelleri, yargı kararları ışığında ele alınmaktadır. Bir markanın coğrafi kaynak gösterip göstermediği ya da yanıltıcı olup olmadığı, ilgili çevrenin algısına göre belirlenmektedir. Eğer ilgili çevre, coğrafî markanın ilişkin olduğu mal veya hizmetin üretim yerine işaret ettiği kanaatinde ise, SMK m.5.1c ya da m.5.1.f hükümleri uygulama alanı bulmaktadır. Anılan durumlarda, marka, ilişkin olduğu mal veya hizmetin coğrafî kaynağını doğru olarak gösteriyorsa m.5.1c, yanıltıcı olarak gösteriyorsa m.5.1.f hükmü uygulanmaktadır. Yargıtay, Pendik Kararı’nda; coğrafî markaların tescil edilebildiği durumlarda dahi tek başlarına tescil edilemeyeceklerini, bunların ancak başka sözcüklerle birlikte oluşturduğu tamlamaların tescil edilebileceğini belirtmiştir. Yargıtay’ın sonraki tarihli kararlarında da benimsenmiş ve kökleşmiş olan bu yaklaşımı, kanaatimizce yerinde değildir. SMK coğrafî markaların ilgili çevre ve rakipler açısından sakınca yaratacağı durumlarda bu markaların tescilini zaten engellemektedir. Bu itibarla Yüksek Mahkemenin söz konusu sınırlayıcı yaklaşımına gerek olmadığı gibi, anılan yaklaşımın Kanun’da da hiçbir dayanağı yoktur.
EMOÇÕES E ÉTICA NA FORMAÇÃO DE FORMADORES
Authors: Sobral Catarina , Caetano Ana Paula , Freire Isabel
Published: September 2018

Neste artigo apresentamos parte do desenvolvimento de um projeto de formação de formadores, que se apoia na investigação sobre desenvolvimento humano nas dimensões emocional e ética e no princípio da autoformação. Segue uma abordagem transdisciplinar, que extravasa o domínio das múltiplas disciplinas científicas que se têm debruçado sobre estas temáticas, assumindo a perspetiva da complexidade e a modalidade de self-study. A realização de self-studies dos formadores é uma prática pouco habitual, pelo que constitui uma vertente inovadora do projeto. Os autores, enquanto formandos/formadores e investigadores do processo formativo, apresentam dados sobre dinâmicas de autoformação, focadas nalgumas das emoções trabalhadas e nas questões éticas que lhe estão associadas. Por fim faz-se uma reflexão sobre essa formação e os princípios da complexidade, nomeadamente os conceptualizados por Edgar Morin.
EPISTEMOLOGIA DA COMPLEXIDADE E METODOLOGIA DE PROJETOS NA EDUCAÇÃO BÁSICA: CAMINHOS POSSÍVEIS PARA A INTER E TRANSDISCIPLINARIDADE
Authors: Santos Marcio Antonio Raiol , Bentes Lívia Maria Neves , Serique Nádia Dos Passos
Published: September 2018

Este artigo apresenta quatro temas que se interpenetram: a Teoria da Complexidade, a Interdisciplinaridade, a Transdisciplinaridade e a Metodologia de Projetos. Nele procuramos articular a fundamentação teórico-metodológica da Interdisciplinaridade e da Transdisciplinaridade, a partir de uma perspectiva de aproximação e complementariedade, alicerçada na epistemologia da Complexidade. Tomando como premissa a necessidade de produção de um conhecimento pertinente no âmbito da Educação Básica, com vistas à valorização da realidade dos educandos, bem como de seu protagonismo nos processos educativos, lançamos como proposta metodológica a utilização da Metodologia de Projetos. A partir deste contexto, nosso principal objetivo é contribuir com as discussões sobre a Interdisciplinaridade e a Transdisciplinaridade na Educação Básica, destacando nesse contexto o papel dos docentes como possíveis catalisadores do processo de planejamento/execução de ações que direcionem o cotidiano da escola para a realidade complexa em que a sociedade contemporânea se insere.
SETE CRÍTICAS À SALA DE AULA INVERTIDA
Authors: Valério Marcelo , Moreira Ana Lúcia Olivo Rosas
Published: September 2018

A sala de aula invertida consiste de um arranjo didático no qual os estudantes têm contato prévio com os conteúdos e dedicam o tempo em classe para tarefas de operacionalização e aplicação dos conhecimentos. Por meio de materiais produzidos e/ou disponibilizados antecipadamente pelos professores, quase sempre com mediação de tecnologias digitais, abrevia-se a tradicional aula expositiva e focaliza-se o encontro presencial em metodologias de aprendizagem ativa. O número de experiências e pesquisas sobre a sala de aula invertida vêm crescendo, mas a precedência e a extrapolação dos resultados positivos tornam questionável a rápida acolhida acadêmica e midiática do modelo. Derivado de uma ampla revisão bibliográfica, este ensaio busca compilar e repercutir visões teóricas e resultados empíricos críticos à sala de aula invertida. São apresentadas sete teses que ilustram a necessidade de atenção, aprofundamento e parcimônia quando da adoção e defesa dessa estratégia por pesquisadores, professores e instituições de ensino.
REVISTA CIÊNCIA HOJE DAS CRIANÇAS: UMA ANALISE DOCUMENTAL SOBRE LIXO, COLETA SELETIVA E RECICLAGEM (2007-2016)
Authors: Borim Danielle Cristina Duque Estrada , Rocha Marcelo Borges
Published: September 2018

Este artigo teve como objetivo investigar textos de divulgação científica publicados na revista Ciência Hoje das Crianças (CHC) relacionados a temática lixo, coleta seletiva e reciclagem, no período de 2007 a 2016. Foram encontrados 116 textos em que as palavras-chave aparecem entre os 110 fascículos analisados da revista. Formaram-se então categorias, tendo como alguns dos resultados: apesar de estar mais ligada a área ambiental, as palavras-chave selecionadas para esta pesquisa transitam em diversas áreas tornando-se assim um tema de cunho interdisciplinar; a revista estimula o hábito da leitura de seus leitores, trazendo uma grande variedade de sugestões de livros, além de filmes, peças de teatro e nos últimos anos, sites; 63 menções de atividades lúdicas e experimentos, utilizando-se de materiais recicláveis, as quais podiam ser desenvolvidas em áreas diversificadas: Artes, Ecologia/Meio Ambiente, Física, Química, Nutrição, Zoologia, Música, o que demonstra mais uma vez o caráter interdisciplinar da revista
DOS CHEIROS ÀS MEMÓRIAS DA ESCOLA: FORMAÇÃO E DOCÊNCIA EM CIÊNCIAS BIOLÓGICAS
Authors: Bremm Daniele , Güllich Roque Ismael da Costa
Published: September 2018

Este estudo parte da análise de narrativas de licenciandos, escritos durante um componente curricular de Prática de Ensino sobre Currículo do Curso de uma licenciatura em Ciências Biológicas. Aos licenciandos foi proposto relembrarem os cheiros de quatro momentos diferentes das suas vidas estudantis: o cheiro da escola em que estudou, o cheiro da escola que visitou na prática, o cheiro da universidade que estudou e os cheiros que desejavam para a sua docência. Através da análise do conteúdo das narrativas, verificamos como as memórias ativadas pelos odores influenciaram na escolha profissional dos mesmos. Percebemos que muitas das memórias, ligadas aos cheiros, remetem a professores de escola, ligando-se à escolha profissional dos mesmos. Portanto, a investigação da ação, pela via da rememoração narrativa, permite repensar muitas das atitudes vividas como alunos, pensadas como professores em formação.

Palavras chaves: Narrativas; Investigação-formação-ação; Ensino de Ciências; Constituição Docente.
Student Teachers Difficulties in Teaching English to Hotel Staff
Authors: Setyarini Maria Christina Eko
Published: September 2018

Professional English teachers often find it difficult when they have to teach English for Specific Purpose (ESP) as they need to do extra works like doing need analysis and creating the specific syllabus before teaching to make sure that the teaching-learning process will go smoothly. Student teachers, who have less experience in teaching, are likely to face greater difficulties in teaching ESP. The study aims at finding out student teachers difficulties in teaching English to hotel staff. Therefore, eight student teachers who recently taught English to hotel staff in their teaching practicum were asked to write about their experience in teaching in form of reflections. The study reveals that the eight student teachers who taught different hotel staff in four customer related divisions, front office, housekeeping, marketing, and food and beverage face similar difficulties. The difficulties are mostly related to the hotel staff. They are teaching facilities, time management, different levels of English proficiency, and low self-efficacy. It is expected that the finding can be useful for student teachers who will do their teaching practicum in hotels, also for those who are interested in studying ESP especially in teaching English to hotel staff.Professional English teachers often find it difficult when they have to teach English for Specific Purpose (ESP) as they need to do extra works like doing need analysis and creating the specific syllabus before teaching to make sure that the teaching learning process will go smoothly. Student teachers, who have less experience in teaching, are likely to face greater difficulties in teaching ESP. The study aims at finding out student teachers difficulties in teaching English to hotel staff. Therefore, eight student teachers who recently taught English to hotel staff in their teaching practicum were asked to write about their experience in teaching in form of reflections. The study reveals that the eight student teachers who taught different hotel staff in four customer related divisions, front office, housekeeping, marketing, and food and beverage face similar difficulties. The difficulties are mostly related to the hotel staff. They are teaching facilities, time management, different levels of English proficiency, and low self-efficacy. It is expected that the finding can be useful for student teachers who will do their teaching practicum in hotels, also for those who are interested in studying ESP especially in teaching English to hotel staff.
Teacher’s Directive Speech Acts at Kindergarten School
Authors: Sari Kharisma Puspita
Published: September 2018

The research is field research with descriptive qualitative research. The research aims to determine and investigate the teacher's directive speech acts at kindergarten school. The research investigates a teacher in a day of teaching-learning activity at kindergartenschool. Deeply, the research investigates a whole sequence of activity in the class. Actually, there are 6 sessions of the learning activity determined such as; 1) forming in line, 2) circle time, 3) praying up, 4) learning activity, 5) take a rest, 6) learning evaluation and review, 7) praying up, 8) singing a song, 9) closing session. From this sequence of activities, there are three types of directive speech acts which is often used by teacher at certain kindergarten school like requests, requirements, and questions. Specifically, there are several types of directive speech acts in details used by the teacher such as asking, interrogating, inquiring, invite, command, order, hope, suggest, prohibit, advice, and others.
A Comparative Study on Group-Based Learning Using STAD and SGD Toward Students’ Writing Achievement of Descriptive Text
Authors: Wahyuni Sri
Published: September 2018

This study discusses a comparative study of group-based learning method between STAD and SGD toward students’ writing achievement of descriptive text on the tenth grade of SMK SalafiyahKajen in the academic year of 2017/2018. The purpose of the study was to differentiate those two methods, which were then found the appropriate method between STAD and SGD for learning writing skill. This study used a mixed method by using comparative design. The subject of this study were the students at the tenth grade of SMK SalafiyahKajen, students’ class RPL 2 and TB. The students from both of the class had different treatment which RPL 2 was treated using SGD and TB was treated using STAD. The technique of data collection was a test, observation, and documentation. The test consisted of two tests; they were pre-test and post-test. After collecting the data, it was found that the average score of pre-test of SGD group was 50.06 and for STAD group was 47.75; meanwhile, the average score of post-test of SGD group was 68.70 and for STAD group was 63.10. So, the computation of t count was 5.031, and the t table was 1.69. The t count was higher than t table, which stated that Ha was accepted. It meant that there was a significant difference between students' writing achievement which was taught by using STAD and SGD. The conclusion defined that SGD was better than STAD to be applied in learning writing.
Design and characteristic analysis of a novel quasi-zero-stiffness isolator using magnets as negative stiffness
Authors: Su Pan , Wu Jiechang , Liu Shuyong , Chang Guanghui , Shi Junjie , Yang Lihua
Published: September 2018

Considering that the static load of marine equipment and the packing space of vibration isolation is limited, a novel quasi-zero-stiffness-isolator (QZSI) using magnets as negative stiffness is designed. The conditions that the QZSI realizes quasi-zero-stiffness at the equilibrium position is obtained by analyzing the static characteristics. The dynamical model of system under a vertical harmonic force is established. The harmonic balance method is used to analyze the dynamic characteristics of QZSI, and the amplitude- frequency relationship expression and force transmissibility are deduced. The influence of different parameters on the performances is analyzed by means of controlling variables. It is shown that the novel QZSI can reduce the response peaks and extend the frequency band of isolator, and that the QZSI provided suitable system parameters can outperform the linear system.
Design of AFM automatically feeding probe system
Authors: Yang Guang , Chang Zewen , Li Tong
Published: September 2018

A set of automatically feeding probe system which can operate independently is designed. It can be widely used in the independent development of most atomic force microscope scanning system. In the approximation process, by VB serial communication, the command is send to control ARM to collect AFM micro-cantilever deflection signal, which is transmitted to the computer for display and analysis, real-time monitor the force between the probe and the sample, and ultimately realize the automatic approximation of probe. The system can be used in combination with various related atomic force microscopy devices, and achieve the goal of personalized multi-function detection.
Numerical study on complex shaped cracks in cantilever beams concerning frequency and stiffness changes
Authors: Tufisi Cristian , Gillich Gilbert-Rainer , Nedelcu Dorian , Hamat Codruta-Oana
Published: September 2018

The paper presents a mathematical relation to express the effects of a T-shaped crack on beam-like structures. The study is performed by using the finite element method (FEM) and contrived analytical formulas for proving the existing correlation between deflection, strain energy, and natural frequency changes. The damaged beam static and dynamic behaviors are analyzed by means of the FEM. The frequency shift for the first mode of vibration derived directly was compared with the frequency alteration calculated involving the change in the beam deflection for several scenarios of the T-shaped crack. The frequency shift is derived using the relations between deflection and natural frequency. As the final step in the research, we compared the outcomes for the same crack with the results achieved from a beam suffering a loss of stiffness.
Vibration test method of nonlinear normal mode
Authors: Li Shiyang , Huang Min
Published: September 2018

Experimental modal analysis is an important tool in dynamic testing. Experimental modal analysis of linear engineering structures is now mature. However, nonlinear behavior of engineering structure is a challenge. In this paper, a vibration test method of nonlinear normal mode (NNM) is studied. First, a 3-DOF test device with nonlinear stiffness is designed. Then, based on methodology of force appropriation, an approach to nonlinear modal testing is studied. Specifically, multi-harmonic sine force excitation is applied on the device and velocity response of the device is measured by laser vibrometer. According to the area in force-velocity response plot, the excitation is adjusted to stimulate nonlinearity of the device. Work of this paper explores vibration test method of NNM and can be used for identification of NNM and response prediction of the system, which lays the foundation for application in engineering structure of aero-engine.
New design of the LED current controller
Authors: Erlan Junusbekov , Baurzhan Tultayev , Gani Balbayev , Aliya Yelemanova
Published: September 2018

In the work traditional and innovative methods for constant current LED drivers have been studied. The low-cost solutions for energy effective low lighting flicker current regulation have been proposed. The advantage is due to fact that auxiliary switch-mode regulator converts only small part of output power. The proposed solution can be used in LED drivers to reduce pulsations of the light flux, as well as in driverless AC LED modules to monitor LED currents and/for power correction.
Centrifugal pump fault detection based on SWT and SVM
Authors: Chen Yu , Liu Hongmei
Published: September 2018

Centrifugal pumps, like other rotating equipment, produce vibration signals during operation. Vibration signals often contain pump state information. Therefore, we can obtain pump state information by using appropriate signal processing methods. Synchrosqueezing wavelet transform (SWT) is a new time-frequency analysis technology. It is an algorithm for rebuilding time-frequency signals, which is similar to the empirical mode decomposition method. It can improve the time-frequency resolution of the signal compared with wavelet transform. In this paper, the SWT is used to analyze the vibration signal of centrifugal pump and extract characteristics. The data shows that the SWT can effectively extract the information of signal in time domain and frequency domain. Then we use the Support Vector Machine (SVM) to classify the features and realize the fault diagnosis of centrifugal pump. The result proves that the fault diagnosis method based on the SWT and SVM.
Mode based frequency behaviour of a cracked beam
Authors: C. V. Chandrashekara , S. I. Raj Arjun , Suswaram Pavan , J. Dharani
Published: September 2018

Structural analysis is mainly concerned with predicting the behaviour of a structure when subjected to any external excitation. Dynamic analysis of simple structures can be carried out using finite element analysis on various computing platforms such as MatLab. In the case of industrial applications, dynamic analysis is mainly carried out using simulations on softwares such as Ansys. The present paper compares mathematical and simulation analysis of cracked beam and the dynamic behaviour with respect to mode shape and crack position is reported.
Influences on dynamic behavior of sliding chain conveyors
Authors: Strobel Jens , Sumpf Jens , Bartsch Ralf
Published: September 2018

Vibrations appearing in transport chain conveyors cause disadvantageous effects in conveying processes and decrease the durability of chains. In order to investigate these vibrations, a conveyor system with sliding chain made of plastic has been selected. Based on a generalized abstraction of this system, a multi-body simulation model was developed which considers viscoelastic properties of the sliding chain. The model was verified by measurements in the conveyor system. Finally, influencing factors on dynamic behavior were examined in more detail by variant calculations.
Nonlinear spatial-time-varying filtering and identification algorithms for correlation-extremum dynamic systems with random structure and their linearization
Authors: Kolosovskaya Tatiana P.
Published: September 2018

The correlation-extremum systems theory is extended to stochastic systems with random structure or with switching parameters and the new suboptimal (due to the nonlinear system state and measurement equations) filtering and parameter identification algorithms and their linearized form are derived, which provide adaptive features and reliable operation for the proposed combined correlation-extremum dynamic systems with random structure under environment influences, and represent new solutions of the linearization problem for the case of great estimation errors. The obtained linearized solution allows the simplification of the filter a priori performance investigation at the signal processing system design stage.
The impact of the passenger train speed on the comfort of humans in a building close to the railway
Authors: Pachla Filip
Published: September 2018

The article presents the impact of the speed of a passenger train on the comfort of humans in the building. Kinematic excitations were obtained from field tests and used in numerical calculations. Numerical calculations were made on the spatial FEA model of the residential building. The WODL ratio prediction curve was determined depending on the train speed.
Study on separation characteristics of two-phase flow in double helical separator
Authors: Guo Hua , Zhou Chuangchuang , Jiang Zhen , Zhou Xiaojun
Published: September 2018

The helical separator plays an important role in improving the working efficiency of electric submersible pump. Separation efficiency of two-phase flow in double helical separator is studied by numerical simulation and theoretical calculation. It is found that the separation efficiency of helical separator increases with the increase of gas-liquid ratio and flow rate. At the same time, under the condition of constant helical number and gas-liquid ratio, the separation efficiency is best when the even difference of pitch is 10 mm.
Methodology for identification of liquid concentration in the periodic microstructures applying numerical-experimental laser interferometric methods
Authors: Janušas Tomas , Janušas Giedrius , Palevičius Arvydas
Published: September 2018

The investigation of the high frequency vibrations of the fluid is an important problem in the design of microfluidic devices (periodic microstructures). Laser interferometric methods such as time average holography, high speed double expose holography or laser light diffraction allow to do analysis of high speed fluid flow and dosing or vibration of micro components used in biological and chemical microsystems. Methodology for identification of liquid concentration in the periodic microstructures applying numerical-experimental laser interferometric methods is presented in this paper.
Dynamic analysis of the moving mechanism of the reciprocating compressor with clearance joints
Authors: Xiao Qingfeng , Liu Shulin , Nie Ang , Xiao Shungen , Cheng Shouguo
Published: September 2018

The clearance faults on joint of moving mechanism are most common in a reciprocating compressor. In order to investigate the relationship between the clearance faults and the dynamic behavior of the moving mechanism, a dynamic model with clearances of a reciprocating compressor is built via software ADAMS. We take into the clearance size and clearance number into consideration and set clearance fault on the joint between the crank and connecting rod, the joint between connecting rod and crosshead and both joints of connecting rod, exploring the effect of these factor on the dynamic response. Then we make a non-linear analysis to estimate the chaos behavior. In the end, we conclude that the clearance size and the number of clearance both strongly influence the dynamic behaviors of the moving mechanism, so do the position where clearance fault happens. As the clearance size increases or the number of clearance fault increase, the acceleration will oscillate more violent and have higher amplitude, furthermore, it is more possible to show chaotic behaviors.
Dynamic analysis of impact on test platform
Authors: Lin Yang , Song Mengmeng , Xiao Shungen , Zhou Xiaojun
Published: September 2018

In this paper, the finite element model of impact test platform is established and analyzed by explicit central difference method. The relationship among different output energy has been obtained, which evaluated the validity of the finite element model and the simulation results. The total energy of the system is relatively constant. Meanwhile, there are two mutations in the kinetic energy, which is basically consistent with the experimental results. The energy change, stress and strain of the test platform during impact are analyzed. Ensure the strength of test platform meets the requirement.
Application of principal component analysis of time-frequency representation for gearbox fault detection
Authors: Wodecki Jacek , Hebda Sobkowicz Justyna , Wyłomanska Agnieszka , Zimroz Radoslaw , Gryllias Konstantinos
Published: September 2018

Dimensionality reduction methods are very useful and effective tools in the field of data analytics, used either independently or as a pre-processing step in the frames of a complex algorithm. In this paper a simple yet powerful technique for local damage detection in heavy-duty industrial machinery is presented with particular focus on gearboxes. It assumes that the cyclic component present in the vibration signal carrying information about the damage, can be extracted from relevant frequency bands of the signal. Although this assumption is usually a starting point for selective filtration in the notion of Informative Frequency Band (IFB) identification, in this case the frequency bands are not addressed directly. The authors propose to apply Principal Component Analysis (PCA) as a dimensionality reduction method on the time-frequency representation of the input data in such a way, that the dimension of frequency is reduced. In this way, the variance maximized in the first principal component is expected to capture the cyclic information which is related to the damage present in the machine.
Informative frequency band identification method using bi-frequency map clustering for fault detection in rotating machines
Authors: Wodecki Jacek , Kruczek Piotr , Hebda-Sobkowicz Justyna , Wylomanska Agnieszka , Zimroz Radoslaw , Gryllias Konstantinos
Published: September 2018

In presented work the problem of local damage detection in rolling element bearings is addressed. Usually such issues require the usage of the techniques of decomposition, separation etc. In such real industrial cases main difficulty lies in relatively low signal-to-noise ratio as well as unpredictable distribution of damage-related information in the frequency domain, hence the typical methods cannot be used. In this paper such industrial scenario is addressed and a simple yet effective approach to underlying component extraction will be discussed. Proposed method analyzes Cyclic Spectral Coherence map as starting data representation, and Expectation-Maximization is used as analytical tool to determine the informative frequency band (IFB) for impulsive component localization in the carrier frequency spectrum. Finally, based on identified IFB, the bandpass filter is constructed to extract the impulsive component from the input signal.
Mobile based vibration monitoring and its application to road quality monitoring in deep underground mine
Authors: Zimoz Radoslaw , Wodecki Jacek , Hebda Sobkowicz Justyna , Wyłomanska Agnieszka , Stefaniak Paweł , Sliwinski Paweł , Kaniewski Tomasz
Published: September 2018

Road quality is an important issue in everyday life for all car owners. This issue seems to be critically important in underground mines, where LHD machines are used for material transport. One of the biggest problems for LHD operation is relatively quick tires degradation. One of possible reasons might be road surface quality, indeed. However, driver's skills as well as ways of machine operation (loading, acceleration, breaking...) might also play a crucial role. Nowadays, many of machines are equipped with onboard monitoring system that allows to monitor basic parameters (speed, torque, temperatures, pressures etc.) at some predefined components. To complete the picture, we propose to use proposed already (but not for mining applications) vibration measurement for road roughness evaluation. To measure vibration acceleration is relatively easy task (we used simple smartphone here), unfortunately method of parametrization and concluding about road quality is still a challenge in mining case. In this paper we have presented a short communication related to first experimental work and some ideas how to deal with this problem using statistical tools for signal modeling.
Research on rail vibration of passing trains
Authors: Burdzik Rafał , Mańska Adam , Nowak Bogusław , Rozmus Jacek , Konieczny Łukasz
Published: September 2018

The paper presents extended abstract on research on rail vibration caused by passing train. The purpose of the investigation was analysis of information capacity of vibration signal in case of different types of railway vehicles. The research was conducted on real rail track with regular operational environment. The measurement system consisted of three 3-axial vibration acceleration sensors and a data-acquisition device registering continuous waveforms of signals. The result analysis present shapes of the signals for separate periods and as comparison for different rail vehicles.
1,3-Thiazolidin-4-ones: Biological Potential, History, Synthetic Development and Green Methodologies
Authors: da Silva Santos Jonas , Junior Joel Jones , da Silva Flavia M.
Published: September 2018

Background:

We present here the synthesis of 1,3-thiazolidin-4-one (1) and its functionalised analogues,
such as the classical isosteres, glitazone (1,3-thiazolidine-2,4-dione) (2), rhodanine (2-thioxo-1,3-
thiazolidin-4-one) (3) and pseudothiohydantoin (2-imino-1,3-thiazolidin-4-one) (4) started in the midnineteenth
century to the present day (1865-2018).

Objective:

The review focuses on the differences in the representation of the molecular structures discussed
here over time since the first discussions about the structural theory by Kekulé, Couper and Butlerov. Moreover,
advanced synthesis methodologies have been developed for obtaining these functional group, including
green chemistry. We discuss about its structure and stability and we show the great biological potential.

Conclusion:

The 1,3-thiazolidin-4-one nucleus and functionalised analogues such as glitazones (1,3-
thiazolidine-2,4-diones), rhodanines (2-thioxo-1,3-thiazolidin-4-ones) and pseudothiohydantoins (2-imino-1,3-
thiazolidine-2-4-ones) have great pharmacological importance, and they are already found in commercial
pharmaceuticals. Studies indicate a promising future in the area of medicinal chemistry with potential activities
against different diseases. The synthesis of these nuclei started in the mid-nineteenth century (1865), with the
first discussions about the structural theory by Kekulé, Couper and Butlerov. The present study has demonstrated
the differences in the representations of the molecular structures discussed here over time. Since then,
various synthetic methodologies have been developed for obtaining these nuclei, and several studies on their
structural and biological properties have been performed. Different studies with regards to the green synthesis
of these compounds were also presented here. This is the result of the process of environmental awareness.
Additionally, the planet Earth is already showing clear signs of depletion, which is currently decreasing the
quality of life.