bluuebunny/crossref_metadata_2025 huggingface dataset:
Effectiveness of Computer-Managed Instruction on Students' Performance in Tertiary Institutions
Authors: Adekunle Salako E. , Adepoju Solomon Adelowo , Suleiman Garba , Abdullahi Muhammad Bashir
Published: May 2020

The roles of information technology in the contemporary world cannot be over-emphasized considering its enormous usage in the educational sector. This chapter investigates the effectiveness of computer-managed instruction (CMI) on students' performance in tertiary institutions in the North-Central Geopolitical Zone of Nigeria. The control group was taught Computer Science using traditional lecture method (TLM) approach, and the experimental group was taught using CMI approach. A total of 360 students in colleges of education (COE), polytechnic, and university participated in the study by using multi-stage sampling procedures. The null hypotheses were tested using ANCOVA and ANOVA statistical analyses at 0.05 level of significance. Findings revealed that there was a statistical difference in the performance scores of students using CMI and TLM approaches. There was also a statistical difference between private and public tertiary institution students' performance. Additionally, the students from the university had the highest mean when compared with students from COE and polytechnics.
Digital Death
Authors: Shelly Marita
Published: May 2020

An increasing use of social media platforms and other mobile applications (apps) has led to the creation, purchase, storage, and use of online information and data including personal or financial information, email communications, photographs, or videos. The purposes of this chapter are to discuss digital property and to determine whether under estate planning and administration law digital property can be inherited like other real and personal property. This chapter will examine relevant legislation in Australia, United States (US), and other jurisdictions including Canada, as well as legal cases that have discussed the issue of accessing or transferring digital property held by service providers such as Facebook. It will also discuss examples of service providers' terms of use and whether these terms allow for digital property to be accessed by a third party. It will conclude with recommendations about how an individual can manage their digital property as part of their will or estate.
How to Integrate Emotions in Dialogues With Pedagogic Conversational Agents to Teach Programming to Children
Authors: Morales-Urrutia Elizabeth Katalina , Ocaña Jose Miguel , Pérez-Marín Diana
Published: May 2020

Pedagogic conversational agents are interactive systems that allow students to dialogue with them about a certain domain to learn. PCAs have been used in multiple domains from pre-primary education to university, in roles such as teacher, student, or companion. In this chapter, Alcody, a PCA to teach programming to children, is enhanced with a new proposal to manage emotions in the dialogue with students. The goal is that when children are learning to program, Alcody can help them with the emotions associated to the learning. Six emotions have been integrated into Alcody: happiness, anger, sadness, fear, surprise, and disgust. A description of how a PCA to teach programming can modify its face and verbal expressions according to the emotion detected in the student. This is given for any other researcher that would like to incorporate emotions in dialogues between PCAs and students.
A Technological Solution for Communication With Deaf Students in the Institutions of Kuwait
Authors: AlKhaldi Wadhah A. , Sarfraz Muhammad
Published: May 2020

The deaf category represents a significant class at the global level, and it is therefore necessary to pay attention to the provision of prominent educational programs and services to help them achieve self-realization and full integration into society. This study seeks to propose a new translation system for deaf students in faculties, universities, and higher institutes in Kuwait. It can help deaf students to obtain better educational services and improve their communications with their hearing students and teachers in the State of Kuwait. Let us call such a system a video relay service (VRS); it can also be adopted in institutions in other parts of the world. The overall research goal is to propose a new translation system that can help students obtain better educational services and improve their communication with their hearing peers and teachers in the State of Kuwait. This chapter proposes a new translation system for deaf students;, a detailed study and methodology of the targeted research has been explained with all its essential elements.
Searching for Answers to Hybrid Approaches in Communication and Learning Environments
Authors: Brown Sr. Michael Anthony
Published: May 2020

This examination focuses on hybrid approaches and highlights two in particular: blended learning and the hybrid shift. Blended learning can support online and face-to-face (F2F) students equally by providing similar learning experiences. Incorporating synchronicity is recommended as a way to address the limitations of asynchronous learning resident in the proposed hybrid approach. Synchronicity is connecting two or more people in related educational events at the same time. Another approach, the “hybrid shift,” features faculty design content and structure with a focus on being thoughtful, engaging, and intentional in promoting learning, effective collaboration, critical thinking, and communication skills. George Santayana said, “those who cannot remember the past are condemned to repeat it.” This is relevant in that social media grew, in part, out of a need to overcome communication limitations of geographical distance and time. This examination looks closely at hybrid approaches and offers some answers for educational implications.
Integrating Authentic Resources in Teaching Language in Literary Texts
Authors: Kui-Ling Lau Emily , Zainal Azlin Zaiti
Published: May 2020

Authentic resources act as a platform for engaging learners' interest and making teaching processes more relevant and realistic. This action research aims to determine the impact of teaching language in literary texts by integrating the classroom-based learning environment with authentic resources. Two activities, “meet-the-author” and “pseudo-cinematic” events, were designed for this batch of undergraduates. Both activities were delineated by non-canon and canon works respectively. For both, assessments aligned with the “meet-the-author” and “pseudo-cinematic” events were conducted. Results and responses from learners were harvested to account for their experiences. Although there is no drastic positive spike in the overall results, findings answered the principal goal of the research where it is discovered that the activities have helped the learners. Through the possibilities of incorporating authentic resources, it is a means for Instructors to address limitations within classroom teaching and learning as well as pique learners' motivation and positive interaction.
Culture Through Poetry
Authors: Morrison Hannah Grace
Published: May 2020

Culture is an essential and challenging part of teaching a second language. For the basic language classroom, instructors play a fundamental role in presenting and creating a space for learning about language forms themselves and learning about how that language is used in context. Poetry is a unique way to analyze both language and cultural artifact. There are a plethora of forms that are represented within poetry, and there are many ways to connect language learning to culture itself. Instructors must take initiative and be intentional with each activity that is incorporated into learning a new language. Poetry is but one of the many ways that culture and language can be analyzed thoroughly, and in this chapter, poetry forms are analyzed as both language structure examples and as a cultural and contextual resource that enriches the classroom environment.
Literature Resources in the Teaching of Arabic Language in Spain
Authors: Fernández Fonfría Lidia , Abella Villar Álvaro
Published: May 2020

This chapter presents a review of the situation of teaching Arabic as a foreign language (TAFL) in Spain in the 20th and 21st centuries, and it focuses on the institutions, trends, methodologies, and resources available. In the last section, the possible applications of literature in the teaching of Arabic will be exposed, paying special attention to the readings that students can use to broaden and consolidate their knowledge. After reviewing the available materials adapted to the Common European Framework of Reference for Languages: Learning, Teaching, Assessment (CEFR), “My Life on Planet Mars” and “A Year in Tangier,” a comparative analysis will be carried out and various application proposals will be presented.
Frisian Literature in Education
Authors: Hoekstra Eric , de Jong Gerbrich
Published: May 2020

Frisian is a minority language taught at least one hour a week in primary schools. As a result, Frisian literature occupies a smaller position in the educational system than Dutch literature, since Dutch is the national language. This chapter discusses systematically the position of fiction and literature in the various types of education in primary schools, secondary schools, universities, and courses for adults. Special attention is given to the way in which officially established attainment goals affect the end term requirements set for the final examinations.
The Teaching of Corpus Languages in Higher Education
Authors: García González Vega María
Published: May 2020

Late Eastern Aramaic (Syriac) is one of the main languages of the Aramaic linguistic group. During the Middle Ages, it became the liturgical language of the Christian communities that arose in the Near and Middle East. Its scholars wrote a large amount of literature and implemented a movement for the translation of Greek theological and scientific works. The extent of Arabic after the Muslim conquest led to the gradual disuse of Late Eastern Aramaic. However, today it still remains a communication and liturgical language in several churches. The aim of this chapter is to offer an overview of Late Eastern Aramaic (Syriac) language teaching at the University of Salamanca, including a summary of the learning goals and a description of the approach and method followed. It is preceded by a brief introduction to the tradition of the studies about this language.
An Israeli University-Level Approach to Judezmo (Ladino), Traditional Language of the Sephardic Jews
Authors: Bunis David Monson
Published: May 2020

Judezmo, or Ladino or Judeo-Spanish, is the traditional language of the Sephardic or Iberian Jews who after 1492 resettled in the Ottoman Empire, many of them remaining in the region into the 21st century. Structurally, Modern Judezmo is composed mostly of elements of popular medieval Ibero-Romance, Ibero-Arabic, Hebrew and Aramaic, Turkish and Balkan languages, and Italian and French. Into the first half of the 20th century, the language was written primarily in the Hebrew alphabet; from the second half of the 19th century, Romanization was also used, leading to the unique Romanization which predominates today. The language was not taught formally in the speech community until the 19th century; instead language study focused on Hebrew. In the late 1970s, popular social pressure led the Israeli government to acknowledge the important role played by Judezmo in the Sephardic Diaspora by introducing Judezmo courses in Israeli universities. The chapter focuses on the challenges of teaching Judezmo at The Hebrew University of Jerusalem.
Cybersecurity Issues and Challenges in Industry 4.0
Authors: Kour Ravdeep
Published: May 2020

The convergence of information technology (IT) and operational technology (OT) and the associated paradigm shift toward fourth industrial revolution (aka Industry 4.0) in companies has brought tremendous changes in technology vision with innovative technologies such as robotics, big data, cloud computing, online monitoring, internet of things (IoT), cyber-physical systems (CPS), cognitive computing, and artificial intelligence (AI). However, this transition towards the fourth industrial revolution has many benefits in productivity, efficiency, revenues, customer experience, and profitability, but also imposes many challenges. One of the challenges is to manage and secure large amount of data generated from internet of things (IoT) devices that provide many entry points for hackers in the form of a threat to exploit new and existing vulnerabilities within the network. This chapter investigates various cybersecurity issues and challenges in Industry 4.0 with more focus on three industrial case studies.
Augmented Technology for Safety and Maintenance in Industry 4.0
Authors: Kukshal Vikas , Patnaik Amar , Singh Sarbjeet
Published: May 2020

The traditional manufacturing system is going through a rapid transformation and has brought a revolution in the industries. Industry 4.0 is considered to be a new era of the industrial revolution in which all the processes are integrated with a product to achieve higher efficiency. Digitization and automation have changed the nature of work resulting in an intelligent manufacturing system. The benefits of Industry 4.0 include higher productivity and increased flexibility. However, the implementation of the new processes and methods comes along with a lot of challenges. Industry 4.0. requires more skilled workers to handle the operations of the digitalized manufacturing system. The fourth industrial revolution or Industry 4.0 has become the absolute reality and will undoubtedly have an impact on safety and maintenance. Hence, to tackle the issues arising due to digitization is an area of concern and has to be dealt with using the innovative technologies in the manufacturing industries.
Towards E-Maintenance
Authors: Chemweno Peter K. , Pintelon Liliane
Published: May 2020

Safety is an important concern for critical assets, such as aircrafts. E-maintenance strategies have long been explored for maintenance decision support and optimizing the operational availability of aircraft assets. Data-driven tools are an important influencer of day-to-day maintenance processes, which if optimally used may support practitioners to design more effective maintenance strategies. Recent trends show a correlation between e-maintenance strategies and enhanced use of data-driven tools for optimally managing technical assets. However, using data-driven tools for designing e-maintenance strategies is challenging because of aspects such as data-readiness and modelling-related challenges. This chapter presents a data-exploration approach for aiding root cause analysis of aircraft systems. The approach embeds algorithms for data preparation, text mining, and association rule mining and is validated in a use-case of maintenance of aircraft equipment, discussed in this chapter.
Internet of Things
Authors: Rashid Mamoon , Nazeer Ishrat , Gupta Sachin Kumar , Khanam Zeba
Published: May 2020

The internet of things (IoT) is a computing paradigm that has changed our daily livelihood and functioning. IoT focuses on the interconnection of all the sensor-based devices like smart meters, coffee machines, cell phones, etc., enabling these devices to exchange data with each other during human interactions. With easy connectivity among humans and devices, speed of data generation is getting multi-fold, increasing exponentially in volume, and is getting more complex in nature. In this chapter, the authors will outline the architecture of IoT for handling various issues and challenges in real-world problems and will cover various areas where usage of IoT is done in real applications. The authors believe that this chapter will act as a guide for researchers in IoT to create a technical revolution for future generations.
Cloud Computing, Smart Technology, and Library Automation
Authors: Martin Lavoris
Published: May 2020

As technology continues to change, the landscape of the work of librarians and libraries continue to adapt and adopt innovations that support their services. Technology also continues to be an essential tool for dissemination, retrieving, storing, and accessing the resources and information. Cloud computing is an essential component employed to carry out these tasks. The concept of cloud computing has long been a tool utilized in libraries. Many libraries use OCLC to catalog and manage resources and share resources, WorldCat, and other library applications that are cloud-based services. Cloud computing services are used in the library automation process. Using cloud-based services can streamline library services, minimize cost, and the need to have designated space for servers, software, or other hardware to perform library operations. Cloud computing systems with the library consolidate, unify, and optimize library operations such as acquisitions, cataloging, circulation, discovery, and retrieval of information.
Developing a Digital Engagement Strategy for Ghanaian University Libraries
Authors: Owusu-Ansah Samuel
Published: May 2020

This study represents a framework that digital libraries can leverage to increase usage and visibility. The adopted qualitative research aims to examine a digital engagement strategy for the libraries in the University of Ghana (UG). Data is collected from participants (digital librarians) who are key stakeholders of digital library service provision in the University of Ghana Library System (UGLS). The chapter reveals that digital library services included rare collections, e-journal, e-databases, e-books, microfilms, e-theses, e-newspapers, and e-past questions. Additionally, the research revealed that the digital library service patronage could be enhanced through outreach programmes, open access, exhibitions, social media, and conferences. Digital librarians recommend that to optimize digital library services, literacy programmes/instructions, social media platforms, IT equipment, software, and website must be deployed. In conclusion, a DES helps UGLS foster new relationships, connect with new audiences, and establish new or improved brand identity.
Video 360 and Augmented Reality
Authors: Miltenoff Plamen
Published: May 2020

The advent of all types of eXtended Reality (XR)—VR, AR, MR—raises serious questions, both technological and pedagogical. The setup of campus services around XR is only the prelude to the more complex and expensive project of creating learning content using XR. In 2018, the authors started a limited proof-of-concept augmented reality (AR) project for a library tour. Building on their previous research and experience creating a virtual reality (VR) library tour, they sought a scalable introduction of XR services and content for the campus community. The AR library tour aimed to start us toward a matrix for similar services for the entire campus. They also explored the attitudes of students, faculty, and staff toward this new technology and its incorporation in education, as well as its potential and limitations toward the creation of a “smart” library.
Violence and Politicization in Argentina in the 1970s
Authors: Pozzi Pablo
Published: May 2020

From the late 1960s throughout the 1970s, Argentina saw the rise and demise of more than a dozen guerrilla organizations. Were they the result of the weakeness of Argentine democracy? Or rather, were they themselves a form of political radicalization that arose by linking left politics with a worker culture of struggle and feelings of oppression? If the latter, political violence became a way to express demands and as such a type of democratic practice by the underclass. This chapter examines a specific guerrilla organization, the PRT-ERP, by seeking to answer who were its members, why did they join such a group, what they believed. The sources for this research include both documents and extensive interviews with members of the guerrilla.
Fascism or Illusionism of Capitalist Dominance in Brazil?
Authors: Seabra Raphael Lana
Published: May 2020

This chapter aims to debate the pertinence of fascism as a concept for analyzing the recent socio-political situation in Brazil. It confronts the fact that there has been, in the last few years, a rise of politicians and movements that seem to reproduce elements typical of fascism: a tendency towards authoritarianism, leadership strength, the decimation of minorities, and a hatred towards the left and differences in general. Confronting the emergence of these phenomena, the chapter will examine certain facts, tendencies, and social classes in contemporary Brazil. The particularities of the political system of domination in dependent capitalism will be highlighted. The power and exploitation structure of dependent capitalism presents significant obstacles for the emergence of a minimally cohesive fascist movement. The country has, however, a repressive and political structure that is not very democratic.
High Definition Corridor Mapping From Images Sequences
Authors: Gurturk Mert , Yılmaz Yalçın , Suleymanoglu Baris , Soycan Arzu , Soycan Metin
Published: May 2020

The density, high accuracy, and rapid collection of geographical data for road surface and surrounding objects and the extraction of meaningful information from these data increases its importance in line with technological developments. Artificial intelligence studies and developments in cloud technology have affected the automotive industry as well as every sector and have enabled the development of driverless vehicle technology. In order to safely drive with autonomous vehicles, high definition maps that contain detailed information for road surface and its surrounding objects with high precision at centimeter-level must be used. In this context, in recent years, the development of mobile mapping systems (MMS) consisting of low-cost sensors and the development of algorithms for the evaluation of the data obtained from these systems have become increasingly popular. In this study, it was investigated whether HD maps can be obtained by using low-cost imaging sensors.
BIM-Enabled Asset Management Information Exchange
Authors: Farghaly Karim , Abanda Fonbeyin Henry , Vidalakis Christos , Wood Graham
Published: May 2020

This study aims to enhance the information exchange of assets that consume energy from the BIM systems to the AM systems. The research design employs a participatory action research (PAR) approach where focus group is utilised to develop the information delivery manual (IDM), and prototyping approach is utilised to develop the MVD and the plug-in. To achieve the research aim, firstly, an IDM has been elaborated through the engagement of industry experts with the research team. Based on the IDM, model view concepts are developed and mapped to the IFC standard for exchange of building information models between two software applications. In addition, a Revit plug-in has been developed to add, construct, and export the required assets and pertinent properties for the exchange. Finally, rule types and checking scenarios have been coded and applied on the top of developed MVD to validate the consistency and accuracy of extracted models. Furthermore, a case study is conducted to evaluate the validation logic rule types applied on the top of the developed MVD.
Conceptual Design Model of Instructional Interfaces
Authors: Tosho Abdulrauf
Published: May 2020

The study investigates the usability of the proposed model for instructional design on Courseware for Inclusive Education System (C4IES). The usability evaluation on courseware is an important constructivist instructional strategy for inclusive educational systems. The study used the comparative analysis technique to evaluate the usability level of proposed model of C4IES. Then, a field study with observation and survey approach were carried out on randomly selected students among distance learning institutes, whereby a group of students was exposed to non-interactive learning aids, whereas the other group was aided with C4IES prototype. The model has been reviewed by seven experts and validated by 202 respondents from approved distance learning through prototyping. On top of that, the findings of user experience indicated that the C4IES is able to fulfil the instructional interface needs for the non-impaired, low-visual, and hearing-challenged learners in terms of motivation in the use of courseware next time. All these findings demonstrate that the proposed model of C4IES is useful for information accessibility and contributes to the designing of instructional design.
An Integrated Academic Accreditation Program (IAAP)
Authors: Alqadasi Reman M. , Rassam Murad A. , Ghaleb Mageed
Published: May 2020

In this paper, an integrated academic accreditation program (named IAAP) is developed. The main focus of this study was engineering education, and a case study of the Faculty of Engineering and Information Technology at Taiz University (TU), Yemen was considered. The IAAP is developed by integrating two academic accreditation programs, the national program (Council of Accreditation and Quality Assurance: CAQA) and the Accreditation Board of Engineering and Technology (ABET). A clause-by-clause comparison of the criteria of the two programs (CAQA and ABET) was applied to construct the IAAP. The developed program is applicable to any other engineering faculty in Yemen. An investigation of the capability of implementing the IAAP was conducted. The investigation process involved the six academic departments of the faculty under study. A weighing and scoring scheme was obtained for each element of the IAAP using the analytical hierarchy process (AHP).
Investigating Doctor Views on E-Health Cards
Authors: Kouris Spyridon , Alikari Victoria , Gerali Maria , Dafogianni Chrysoula
Published: May 2020

Computing is a powerful health resource that contributes to the improved quality of health services provided by medical units. This study aimed to investigate Greek physicians' views on the electronic health card. Between February 2019 to April 2019, 116 physicians from three hospitals in the broad area of Athens completed a self-administered questionnaire related to the use of the Internet, the electronic health card, and information technology in health. The results were analyzed with IBM SPSS 23.0. A positive assessment of the model in terms of its potential public health benefits was found. Obstacles to the management of health information systems and the high cost must be taken into account. The smart card is a possible channel for improving the quality of the services provided, making significant progress in the units of the national health system but the implementation cost and the ways of managing it must also be taken into consideration.
Study of Dielectric Characteristics and Energy Storage Properties of Sr0.7Bi0.2TiO3 Doped with CaTiO3
Authors: Zhao Peng , Tang Bin , Si Feng , Yang Cheng Tao , Zhang Shu Ren
Published: May 2020

Sr0.7Bi0.2TiO3 (SBT), a kind of lead-free relaxor ferroelectric, is attracting more and more attention for pulse energy storage applications due to the low remnant polarization and high energy storage efficiency (h). However, relatively low dielectric breakdown strength (DBS) limited the recoverable energy storage density (Wrec). Herein, CaTiO3 with high intrinsic DBS was introduced in SBT. The novel solid solutions (1-x)SBT-xCT with x = 0 - 0.15 shows pure pseudo-cubic perovskite structure. When x = 0.05, the maxium polarization are improved, and the CT doping decreases the average grain size, leading to an enhanced DBS. A high energy storage properties of 1.59 J/cm3 with the h of 87.4% at 220 kV/cm is achieved in 0.95SBT-0.05CT, which demonstrates that this 0.95SBT-0.05CT is prospective materials for energy storage application.
Enhancing the Photocatalytic Activity of La/Y Co-Doped ZnWO4 under UV Irradiation
Authors: Rao Chu Wen , Zhang Wei , Hu Zheng Fa , Feng Zu Yong , Chen Ying Jun , Pan Yong Man , Hu Pei Ju , Wang Yin Hai , Zhao Wei Ren
Published: May 2020

In this paper, ZnWO4: La3+, Y3+ photocatalysts were synthesized by a high-temperature solid state reaction method. The effects of La3+ and Y3+ doping contents on the phase, morphologies and optical properties of the samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Diffuse reflectance spectra (DRS), photoluminescence spectra (PL), Raman and UV-visible spectroscopy, respectively. The as-prepared ZnWO4:La3+, Y3+ photocatalysts showed photoluminescence with a broad band emission, and high photocatalytic activity in degradation of rhodamine B (RhB) under simulated UV irradiation. The results showed that co-doping in ZnWO4 can enhance light harvesting capability to generate more electron-hole pairs, and acted as a trap center by decreasing the recombination of photogenerated electrons and holes. All the results obtained by the work suggest that ZnWO4: La3+, Y3+ photocatalysts are promising materials for the photocatalytic decomposition of pollutants.
The Influence of Carbon Material on the Low-Temperature Performance of Lead-Acid Battery
Authors: Wang Yue , Zhang Peng , Li Yun Long , Li Lin , Liang Jian Quan , Gao Yuan , Zhang Hong Da , Sun Wei
Published: May 2020

Storage battery is an indispensable energy storage device at present. It is widely applied to industries like electric automobiles due to its advantages such as safety, reliability, low cost, etc. However, like most storage batteries, lead-acid battery has a series of problems in the low temperature environment such as the plunge of capacity, difficulty of charge, and so on, which deeply influence its application effect. To improve the low temperature performance of lead-acid battery, carbon materials could be added to the cathode of lead-acid battery. By measuring the properties like HRPSoC cycle and dynamic charging under different carbon (graphite) content, this article concludes that the addition of carbon material could improve the low-temperature performance of lead-acid battery. When the carbon content is between 0.3% and 0.9%, the improvement effect is relatively better. The research result of this article has a reference function to the design and development of low-temperature lead-acid batteries.
Effects of L-Cysteine on the Photoluminescence Properties of ZnO:S Quantum Dots
Authors: Dai Wen , Duo Shu Wang , Li Xiao Xia , Chen Zhong , Zheng Zi Chuan , Chen Zhen Yu , Lu Xiao Yu
Published: May 2020

ZnO:S quantum dots (QDs) were synthesized by a microwave hydrothermal method. The effects of L-cysteine (L-cys) on the crystal structure, size, morphology, band gap energy and photoluminescence (PL) properties were studied by XRD, EDS, TEM, FTIR, DRS and PL spectroscopy, respectively. The XRD results showed that all samples had a wurtzite structure ZnO crystal structure and the average crystallite size was 8.4, 5.8, and 9.2 nm for ZnO, ZnO:S and L-cys capped ZnO:S (LZOS) QDs, respectively. The EDS, HRTEM and FTIR results confirmed L-cys was capped on the surface of ZnO:S QDs. It was found that the band gap energy was 3.25, 3.29 and 3.31 eV for ZnO, ZnO:S and LZOS QDs, successively. PL spectrum of ZnO QDs showed two emission peaks in the UV and visible region, respectively. When doping S into ZnO, the intensity of the UV emission reduced, while the intensity of the visible emission dramatically increased. Also, L-cys coated obviously enhanced the PL intensity of ZnO:S QDs. This work suggested that LZOS QDs could be applied in luminescent devices.
Analysis on the Selection of Low Temperature Resistant Materials for Electric Equipment State Monitoring Device in Cold Areas
Authors: Zhang Hong Da , Wang Yue , Liu Li Wei , Feng Hai Tao , Li Lin , Liang Jian Quan , Sun Wei
Published: May 2020

As the important device to perceive the operating state of grid, the condition monitoring device of electric equipment solves such problems as the high rate of false alarm and failure of device caused by the low temperature in winter of cold areas. This paper measures the thermal conductivity of such three kinds of materials as asbestos, rubber and nano porous aerogels in the temperature range of -55°C to +80°C by steady state method, and analyzes the influence of temperature on the thermal conductivity of three materials. According to the result of experiment, the thermal conductivity of nano porous aerogels is the lowest and is affected least by temperature among three kinds of materials. Nano porous aerogels apply to state monitoring device operated in cold areas; and rubber can also be used as thermal insulation material when the operating temperature is generally higher than -20°C.
Magnetic Field Analysis of Polishing Tools in Permanent Magnetic Field Polishing Device
Authors: Zhou Xiao Qin , Sun Bao Quan , Wang Hao Cheng , Wu Xiao Yang , Yu Hang
Published: May 2020

In order to achieve the polishing of the inner wall of the workpiece with a complex internal cavity structure. In this paper, a planar polishing machine is used as an example to design a polishing device platform. The permanent magnet is used as a magnetic field to drive the polishing tool to polish the inner surface of the workpiece. In this paper, a magnetic field internal polishing analysis method is proposed, which mainly uses the matlab to qualitatively analyze the magnetic force and magnetic moment of the polishing tool, and then qualitatively analyze its motion stability.
Graft Copolymerization onto Starch Nanoparticle Using Peroxymonosulfate/ Mandelic Acid as a Novel Redox Pair
Authors: Mostafa Khaled Mohamed , Ameen Heba Abed El Meged , El-Sanabary Azza Awad
Published: May 2020

Unreported peroxymonosulfate/mandelic acid as a redox pair initiation system has been used to graft copolymerizes acrylonitrile onto our previously prepared starch nanoparticle (SNPs) in aqueous medium under nitrogen atmosphere. Optimization of the grafting conditions was studied and the grafting parameters were expressed in terms of graft yield %, graft reaction efficiency % and homopolymer %. Fourier transformer infrared spectroscopy (FTIR), Scanning electron microscope (SEM) and thermal gravimetric analysis (TGA) techniques confirmed the synthesis of the precursor’s materials and the success of the grafting onto starch nanoparticle. The resultant copolymer was found to be more thermally stable and more resistance to biodegradability than the starch nanoparticle counterparts. Besides, the optimum conditions were obtained when using 1 g starch nanoparticle, 2 ml of AN (based on weight of substrate), 30 m mol/l potassium peroxymonosulphate, 8 m mol/l mandelic acid, 2 hours reaction time and 45°C of temperature.
Analysis of Service Life of Surface Coated-Concrete Structures Considering Climate Change and Chloride Ingress
Authors: Wang Xiao Yong
Published: May 2020

Mortar surface coating is widely used as a finishing material to extend the service life and improve chloride ingression resistance of marine concrete structures. This study proposes a model for estimating the service life of surface-coated marine concrete considering climate change. First, the increase of chloride diffusivity due to climate change is considered using Arrhenius’ law. A two-layered chloride ingress model is used to analyze chloride profile. The probability-based approach is used to find the service life of concrete structures. Second, parameter analysis is performed considering the effects of various factors on service life. The influences of thickness and chloride diffusivity of the coating and substrate concrete on service life are highlighted. The reduction of service life due to climate change is clarified based on the regression of results of parameter analysis. For marine concrete with 50 years’ service life, 6% service life reduction occurs because of climate change.
Synthesis and Self-Healing Mechanism of Self-Healing Epoxy Microcapsule Materials
Authors: Ni Zhuo , Guo Zhen , Lin Yu Hao
Published: May 2020

Self-healing epoxy resin microcapsules are prepared by interfacial polymerization, in which the core materials are epoxy resin, the wall materials are constructed with triethylenetetramine and the epoxy resin. The orthogonal experimental L9(34) are designed to investigate the influence of emulsifier dosage, hardener dosage, curing temperature and hardener adding rate on the core content and storage life of epoxy resin microcapsule. Scanning electron microscope is used to characterize surface topography and distribution. Fourier transform infrared spectroscopy is used to study reaction mechanism of the microcapsule wall materials, respectively. The results indicate that when the dosage of emulsifier is 1.2%, the dosage of hardener is 1.2%, the hardener droplets adding rate is 1.2 g/h and the curing temperature is 50°C, the prepared microcapsules with a high level of core content are spherical in shape with good surface compactness and dispersibility. Future research may focus on improving microcapsule storage stability and the obstacles encountered in practical applications.
Characteristics of Films on the Surface of Sea Sand and Effects on the Dissolution of Chloride
Authors: Sun Fei Long , Wu Shuai , Jiang Quan , Chen Huo Cheng , Guan Hong Yan
Published: May 2020

In this study, the effects of the specimen preparation method, temperature, and duration of the extraction step for the determination of the water-soluble chloride content of sea sand were investigated. The results demonstrated that increasing the heating temperature and duration promoted the dissolution of chloride, where the maximum value was obtained at 80°C and 60 min. Hot water extraction (80°C/60 min) could eliminate the effects of different specimen preparation methods on the final test results. Therefore, a new method was developed with drying at a temperature of 110 ± 5°C and hot water extraction at a temperature of 80°C for 60 min. The suitability of the new method for determining the water-soluble chloride content of sea sand was verified by testing the extracted specimens again. The results indicated that the chloride in sea sand dissolved fully with the new method, and thus it is suitable for testing the water-soluble chloride content of sea sand. Finally, the organic and inorganic compositions of the film adsorbed on the surface of sea sand were studied based on thermogravimetric analysis, inductively coupled plasma atomic emission spectrometry, ion chromatography, and total organic carbon measurements. The results indicated that a layer of substance (a multi-substance film) was adsorbed onto the surface of sea sand. This layer comprised inorganic salts (such as Cl–, Na+, Mg2+, SO42–, and Ca2+) and organic compounds, which were related to the composition of sea water. The multi-substance film greatly affected the dissolution and diffusion of chloride in the sea sand. Hot water extraction accelerated the dissolution of the film and increased the test results in terms of the water-soluble chloride contents.
Microstructure and Properties of Co-Ni-Cr3C2 Nanocomposite Coatings Produced by Jet-Electrodeposition
Authors: Zhang Qing , Tan Jun , Meng Ling Dong , Zang Yan , Zhao Hai Chao , Xu Yao Yao
Published: May 2020

Co-Ni-Cr3C2 nano-composite coatings at various concentrations of Cr3C2 particles were produced by Jet-eletrodeposition. Surface morphology and crystallographic structure of the coatings were investigated by means of SEM and XRD. Mechanical properties of the coatings were determined using Vickers microhardness and friction wear tester. It was found that adding nano-Cr3C2 concentration in electroplating bath weakens the abnormal co-deposition to a certain extent and decreases the deposition amount of co. The increase of the content of nano-Cr3C2 in the bath, the content of nano-Cr3C2 in the coating increases, when the content of nanoparticles is 80g/l, the content of nano-chromium carbide in the coating reaches the maximum value of 25.13 wt.%. With the addition of nano-Cr3C2 particles, the surface of nanocomposite coating is uneven and presents cauliflower head morphology. When the content of nano-Cr3C2 particles is 40g/l, the growth of the coating is the most uniform and compact. The phase structure of Co–Ni/nano-Cr3C2 coatings is not changed by the codeposition of nano-Cr3C2 particles, but it obviously influences the growth and orientation of crystal planes in composite coatings, especially at high nano-Cr3C2 particles content. Maximum microhardness was observed to be 595 Hv for Co-Ni-40g/L Cr3C2 coating and its wear resistance is the best at the same time.
Research on Partial Discharge Characteristic of Nano MMT Modified Insulation Pressboard
Authors: Liu He Qian , Zhang Hong Da , Yu Chun Lai , Zhang De Wen , Li Lin
Published: May 2020

In order to restrain partial discharge phenomenon of oil-paper insulation in convertor transformer, the nano montmorillonite (MMT) modified pressboards were developed by nano-doping method. The influence of nano modification on dielectric characteristics of modified pressboards were investigated, and their partial discharge characteristics in pin-plane electrode system were also studied. Meanwhile, the inhibition mechanism to partial discharge of nano-modification was analyzed by software simulation, and its impact to breakdown characteristics was verified as well. The measuring results showed that the conductivity rose with the increase of nano-doping content, while the relative permittivity fell firstly and then rose, which reaching the minimum value at 1%. Also, the breakdown strength of modified pressboard at nano doping ratio of 1% is higher than other ratios under DC and AC voltage. Further, the partial discharge inception voltage increases and maximum PD quantity decreases under same voltage level in oil-paper insulation by using nano modified pressboard at this ratio. Moreover, it helps to homogenize the electric field distribution of insulation structure in PD experiment, and finally contributes to the improvement of breakdown characteristics.
A Spider's First Meal After Molting
Authors: Dondale C.D.
Published: May 2020

Observation of ecdysis in one male and three females of the spider
Philodroms rufus Walckenaer (family
Thomisidae) has revealed a hitherto unreported source of food for newly
molted spiders. After hanging suspended from their exuvia by the spinnerets
for a few minutes, the spiders suddenly flexed their legs and ran quickly
from base to tip of each exuvial leg, pressing their mouthparts along the
limbs. On reaching the tip of each tarsus the spiders bit the old cuticle,
allowing a column of colorless liquid that extended through the distitarsus
and basitarsus and part way up the tibia to be withdrawn steadily and
rapidly. One of the spiders drew the liquid from only four of the exuvial
legs, while the others drew from all eight. Having fed, the spiders were
immediately capable of normal activity.
Description of A Peculiar New Liparid Genus from Maine
Authors: Neumoegen B.
Published: May 2020

Head prominent, with a high vertical tuft. Front nearly square, rather
higher than broad; slightly convex Vertex small, with a low, conical central
projection. Ocelli absent. Eyes large, naked, reaching as far as the front
and above the vertex. Antennae inserted far apart, close to the margin of
the eyes. In $$ lengthily bipectinate, the pectinations diminishing
gradually, the distal third being bare. To judge from the fragments of a $$
specimen with broken off antennæ (only 6 joints left to judge from), the $$
antennae are apparently simple. Palpi exceeding front by two thirds their
length; second joint very large, third small. Tongue weak, but moderately
long, coiled. Thorax robust, about as broad as long.
Cavitating Pulmonary Metastases from a Renal Cell Carcinoma
Authors: Gunasekaran Kulothungan , Baskaran Berty , Rahi Mandeep Singh , Parekh Jay , Rudolph Daniel
Published: May 2020

Cavitary lung lesions are quite common findings on chest imaging and often pose a diagnostic challenge to the clinicians. We describe a case of a 75-year-old male who presented to the emergency room with hemoptysis. Computed tomography of the chest demonstrated multiple cavitary pulmonary nodules with peripheral groundglass opacities. Bronchoscopy did not reveal any active bleeding source, and washings were negative for malignancy and infectious cause. Computed Tomography guided biopsy of the left lung nodule showed metastatic carcinoma consistent with papillary renal cell carcinoma. This case highlights the unusual presentation of metastatic renal cell carcinoma.
Implications for Early Postoperative Care After Quadriceps Tendon Autograft for Anterior Cruciate Ligament Reconstruction: A Technical Note
Authors: Hunnicutt Jennifer L. , Slone Harris S. , Xerogeanes John W.
Published: May 2020

The quadriceps tendon (QT) has become increasingly used by orthopaedic surgeons as an alternative autograft choice in anterior cruciate ligament reconstruction. As its use increases, athletic trainers and other rehabilitation clinicians will treat a greater number of patients with this autograft type. The recently developed, minimally invasive technique for harvest of the all-soft tissue autograft has many benefits, including versatility, decreased donor-site morbidity, and enhanced cosmesis. Early clinical trials revealed that the QT autograft resulted in decreased anterior knee pain and similar strength and functional outcomes to those of more common autograft types. From a rehabilitation perspective, many characteristics should be considered, such as the importance of early knee extension and quadriceps activation. Therefore, the purpose of this technical note is to expose athletic trainers to the QT autograft so that they may provide the best care for patients after anterior cruciate ligament reconstruction.
Dimension groups for self-similar maps and matrix representations of the cores of the associated C*-algebras
Authors: Kajiwara Tsuyoshi , Watatani Yasuo
Published: May 2020

We introduce a dimension group for a self-similar map as the
$\mathrm {K}_0$
-group of the core of the C*-algebra associated with the self-similar map together with the canonical endomorphism. The key step for the computation is an explicit description of the core as the inductive limit using their matrix representations over the coefficient algebra, which can be described explicitly by the singularity structure of branched points. We compute that the dimension group for the tent map is isomorphic to the countably generated free abelian group
${\mathbb Z}^{\infty }\cong {\mathbb Z}[t]$
together with the unilateral shift, i.e. the multiplication map by t as an abstract group. Thus the canonical endomorphisms on the
$\mathrm {K}_0$
-groups are not automorphisms in general. This is a different point compared with dimension groups for topological Markov shifts. We can count the singularity structure in the dimension groups.
Normalizer, divergence type, and Patterson measure for discrete groups of the Gromov hyperbolic space
Authors: Matsuzaki Katsuhiko , Yabuki Yasuhiro , Jaerisch Johannes
Published: May 2020

For a non-elementary discrete isometry group

G

of divergence type acting on a proper geodesic

delta

-hyperbolic space, we prove that its Patterson measure is quasi-invariant under the normalizer of

G

. As applications of this result, we have: (1) under a minor assumption, such a discrete group

G

admits no proper conjugation, that is, if the conjugate of

G

is contained in

G

, then it coincides with

G

; (2) the critical exponent of any non-elementary normal subgroup of

G

is strictly greater than the half of that for

G

.