bluuebunny/crossref_metadata_2025 huggingface dataset:
Dimensi politik hukum dalam perkembangan ekonomi Islam di Indonesia
Authors: Iswanto Bambang
Published: August 2017

This study aims to describe the history of recent Islamic economic development in the correlation to politics as a sought to formulated some Islamic economic laws. This qualitative study is an exploratory- analysis. It intended to analyze the position of Islamic economic in Indonesian’s system of law, so it will found the clear description of the implementation of Islamic economic laws in Indonesia. It is a library research. The study found that it is important to found the frame of the development of the products of Islamic economic law at the both period; i.e. New Order and Reformation Era. The concept of Islamic economy is still dominated by the application of Islamic principles in the areas of finance, especially banking. This dominance is not supposed to leave the Islamic economic instruments. In this respect, it associated with the political and legal product, then all the aspects and the Islamic economic instruments should be viewed comprehensively. Tulisan ini akan menguraikan mengenai sejarah ekonomi Islam modern dan keterkaitannya dengan politik dalam upaya merumuskan berbagai hukum ekonomi Islam. Penelitian kualitatif ini merupakan studi exploratory-analysis. Pendekatan ini dimaksudkan untuk menganalisis posisi ekonomi Islam dalam tata hukum Indonesia sehingga akan dapat diperoleh gambaran bagaimana bentuk implementasi ekonomi Islam di Indonesia. Penelitian kepustakaan ini menemukan urgensi untuk menemukan kerangka pengembangan produk hukum ekonomi Islam pada dua periode yang ada yaitu Orde Baru dan Era Reformasi. Konsep ekonomi Islam masih didominasi dengan penerapan prinsip Islam dalam bidang keuangan terutama perbankan. Dominasi ini tidak seharusnya melupakan instrumen ekonomi Islam lainnya karena jika dikaitkan dengan politik dan produk hukum, maka semua aspek dan instrumen ekonomi Islam tersebut harus bisa dilihat secara komprehensif.
Kontribusi Religiusitas dalam Perilaku Pengambilan Keputusan Konsumsi
Authors: Bawono Anton
Published: August 2017

Consequential is one aspect of religiousity, which one is away from anyform imposed by Allah s.w.t. Consumption is forbidden by Allah swt isthe consumption of haram goods. In this study will look at contributionshalalness a product of consumption decisions. This study used fourindependent variables of quality, halal, price and side effects. Thesampling method used was non-probability sampling method using themethod of sampling convenience. Analysis of data has using multiplelinear regression analysis. The findings of the four variables showed apositive and significant effect, the variable side effects are most dominantvariable. While halal variable have the second greatest influence indetermining consumption decisions. This suggests that religiosity variableis a variable that determines the capture market share, in the marketingstrategy
Terminology and tensions within evidence-informed decision-making in South Africa over a 15-year period
Authors: Stewart Ruth , Dayal Harsha , Langer Laurenz
Published: August 2017

In this article, we examine a key premise underlying evidence-informed decisionmaking (EIDM) – that research is for all, including service users and potential users, service providers and a wide range of decision-makers, from those running local services to national government
officials and international agencies. Qualitative data collected on terminology used when writing and talking about EIDM over a period of 15 years during the implementation of a number of capacity development programmes in South Africa were combined with critical reflections in practice. Findings
reveal that tensions exist in the titles and terminology used to describe the relationships between academia and government or between research and policy, and that these tensions have shifted over time, but not necessarily diminished. An analysis and critique of this terminology is provided
to identify and unpack these tensions, which challenge the central premise of 'research for all'. The perpetuation of divisive labels that profile people, of job titles and specific terminology that describe agency, as well as the use of technical language, continues to exclude people from
the approach. These have the effect of setting up users against producers of evidence. In conclusion, we challenge the advocates of the EIDM approach to review language and terminology to be more inclusive, to enable relationship-building and ease the process of engagement to ensure evidence-informed
decision-making is true to its premise that research is for all.
Participatory research: Where have we been, where are we going? – A dialogue
Authors: Hall Budd L. , Tandon Rajesh
Published: August 2017

Rajesh Tandon and Budd Hall, the UNESCO Co-Chairs in Community-Based Research have worked together on the theory and practice of participatory research since they first met in Caracas, Venezuela in 1978. This article is a conversation between the two of them that took place in New Delhi,
India in 2015. It covers the creation of the concept of participatory research, a coming to awareness of the importance and power of local knowledge, the creation of the International Participatory Research Network and their thoughts on some of the challenges facing community and academic
partners today. Of note is the fact that the early roots of participatory research were found in the global South, specifically in Africa, Asia and Latin America. Of further interest is the fact that for the first 20 to 25 years, participatory research was a discourse located almost entirely
outside formal academic circles but rather in social movement structures and civil society circles.
Effectiveness of Kaempferia galanga extract for the prevention of saprolegniasis on catfish Clarias gariepinus eggs
Authors: Humsari Arvilia , Rosidah , , Junianto ,
Published: August 2017

ABSTRACTSaprolegniasis is a disease caused by the infection of Saprolegnia sp. Saprolegniasis can attack catfish eggs causing a decrease in hatching rate. There are some plants which have an antifungal potential, e.g. cutcherry Kaempferia galanga L. This study aimed to obtain the effective concentration of cutcherry rhizome extract for the prevention of saprolegniasis, resulting in a high hatching rate. This study applied five treatments: the extract at concentrations of 0 mg/L; 20 mg/L; 40 mg/L; 60 mg/L; and 80 mg/L applied to catfish eggs. The method applied was the immersion of eggs in cutcherry extract for one hour. The results showed that the immersion method applied in the application of cutcherry rhizome extract could reduce saprolegniasis. This was indicated by the decrease of saprolegniasis compared to control. The use of cutcherry rhizome extract (the treatment at concentrations of 20 mg/L; 40 mg/L; 60 mg/L; and 80 mg/L) could prevent saprolegniasis with saprolegniasis levels of 43.5%; 27.5%; 19.5%; and 18.5%, respectively. Keywords :  catfish eggs, cutcherry rhizome extract, saprolegniasis  ABSTRAKSaprolegniasis merupakan suatu penyakit yang timbul karena infeksi Saprolegnia sp.  Saprolegniasis dapat menyerang telur ikan lele yang menyebabkan turunnya daya tetas telur. Terdapat beberapa tanaman yang memiliki daya antifungi seperti tanaman kencur Kaempferia galanga L. Penelitian ini bertujuan untuk mendapatkan konsentrasi ekstrak rimpang kencur yang efektif untuk pencegahan penyakit saprolegniasis sehingga menghasilkan daya tetas telur yang tinggi. Penelitian menggunakan lima perlakuan yaitu dosis ekstrak 0 mg/L (kontrol); 20 mg/L; 40 mg/L; 60 mg/L; dan 80 mg/L dengan menggunakan telur ikan lele sangkuriang. Metode yang digunakan yaitu perendaman telur dalam ekstrak kencur selama satu jam. Hasil penelitian menunjukkan bahwa metode perendaman ekstrak rimpang kencur dapat mengurangi saprolegniasis. Hal ini ditunjukkan dengan semakin menurunnya saprolegniasis jika dibandingkan kontrol. Penggunaan ekstrak rimpang kencur (perlakuan 20 mg/L; 40 mg/L; 60 mg/L; dan 80 mg/L) dapat mencegah saprolegniasis berturut-turut 43,5%; 27,5%; 19,5%; dan 18,5%. Kata kunci : telur ikan lele, ekstrak rimpang kencur, saprolegniasis
Growth, biomass, and chlorophyll-a and carotenoid content of Nannochloropsis sp. strain BJ17 under different light intensities
Authors: Fakhri Muhammad , Arifin Nasrullah Bai , Hariati Anik Martina , Yuniarti Ating
Published: August 2017

ABSTRACT  Nannochloropsis sp. has been identified as sources of live feed and pigment in aquaculture. To increase the production, the optimal environmental conditions for microalgae are required. Light intensity is one of the important factors that significantly affects the biomass and pigment of microalgae. The study aimed to determine the effect of light intensity (1,500; 3,000; and 4,500 lux) on growth, biomass production, chlorophyll-a, and carotenoid content of Nannochloropsis sp. strain BJ17. The results showed that different light intensities significantly affected the growth, biomass, chlorophyll-a and carotenoid contents of Nannochloropsis sp. strain BJ17. Increasing light intensity resulted in the increase of the growth rate, biomass, chlorophyll-a, and carotenoid contents of Nannochloropsis sp. strain BJ17. The cell achieved the highest specific growth rate of 1.729 %/day and the cell concentration of 43.333×106 cell/mL at a light intensity of 4,500 lux. The highest chlorophyll-a and carotenoid concentrations of algae were obtained at 4,500 lux (8.304 μg/mL and 3.892 μg/mL, respectively). This study suggested that increasing light intensity led to the increase in the growth, biomass, chlorophyll-a, and carotenoid content of Nannochloropsis sp. strain BJ17. Keywords: carotenoid, chlorophyll, biomass, growth rate, light intensity  ABSTRAK  Nannochloropsis sp. diketahui sebagai sumber pakan alami dan pigmen pada budidaya perikanan. Budidaya pada kondisi lingkungan yang optimal diperlukan untuk meningkatkan produksi mikroalga. Intensitas cahaya merupakan salah satu faktor esensial yang secara signifikan mempengaruhi biomassa dan pigmen mikroalga. Tujuan penelitian ini adalah untuk menentukan pengaruh intensitas cahaya yang berbeda (1.500, 3.000, and 4.500 lux) terhadap pertumbuhan, produksi biomassa, klorofil-a, dan karotenoid Nannochloropsis sp. strain BJ17. Hasil menunjukkan bahwa intensitas cahaya yang berbeda berpengaruh secara signifikan terhadap pertumbuhan, biomassa dan klorofil-a dan karotenoid Nannochloropsis sp. strain BJ17. Semakin tinggi intensitas cahaya maka laju pertumbuhan, biomassa, kandungan klorofil-a dan total karotenoid Nannochloropsis sp. strain BJ17 semakin tinggi. Laju pertumbuhan spesifik tertinggi 1,729%/hari dan konsentrasi sel maksimum tertinggi 43,333×106 sel/mL dihasilkan pada intensitas cahaya 4.500 lux. Konsentrasi klorofil-a (8,304 μg/mL) dan karotenoid (3,892 μg/mL) tertinggi juga diperoleh pada intensitas cahaya 4.500 lux. Studi ini menunjukkan bahwa peningkatan intensitas cahaya berperan dalam meningkatkan pertumbuhan, produksi biomassa, klorofil-a, dan karotenoid Nannochloropsis sp. strain BJ17. Kata kunci: karotenoid, klorofil, biomassa, pertumbuhan, intensitas cahaya
Survival and growth responses of snakehead fish Channa striata Bloch. juvenile in aerated and unaerated acid sulfate water
Authors: Purnamawati , , Djokosetiyanto Daniel , Nirmala Kukuh , Surawidjaja Enang Harris , Affandi Ridwan
Published: August 2017

ABSTRACT  The aim of the research was to analyze survival rate, specific growth rate, albumin, and feed efficiency and physiological (blood glucose, cortisol, dan haemoglobin) responses of snake head fish juvenil that reared at aerated and unaerated of tidal land water have been conducted in the laboratory. Experiments using completely randomized design with aerated and unaerated as a treatment, and each treatment has twelve replications. The snakehead fish juvenil wich length 2.4±0.2 cm and weight of 0.21±0.05 g reared in the aquarium that are size 30×25×35 cm (water volume 25 L) with a stocking density 2 juvenile/L, for 40 days. The fishes were fed with commercial feed with protein content about 40%, feeding two times a day (morning and afternoon) were at satiation. Replacement of water done every two days about 10% of the total water volume in the aquarium. The results showed that unaerated median significantly affected to biometric and physiological response of juvenile of snake head fish. The media un-aerated gives the best results shown by the higher value of survival (92%), specific growth rate (6.73%/ day), feed efficiency (78.22%), protein retention (41.91%), energy retention (30.81%) value of albumin (6.60 g/100 mL) and the haemoglobin (5.58 g/dL), and have the lowest value of cortisol (21.49 ng/L) and blood glucose (43.36 mg/100 mL). Keywords: acid sulfate water, growth rate, aeration, Channa striata   ABSTRAK  Penelitian ini bertujuan untuk menganalisis respons kelangsungan hidup, pertumbuhan spesifik, albumin, dan efisiensi pakan dan fisiologis (kortisol, glukosa darah, dan hemoglobin) juvenil ikan gabus yang dipelihara dengan dan tanpa aerasi pada media air rawa pasang surut. Penelitian menggunakan rancangan acak lengkap dengan aerasi dan tanpa aerasi sebagai perlakuan, dan masing-masing perlakuan memiliki 12 ulangan. Juvenil ikan gabus berukuran panjang 2,4±0,3 cm dan bobot 0,21±0,03 g dipelihara dalam akuarium 30×25×35 cm (volume 25 L) dengan padat tebar 2 ekor/L, selama 40 hari. Ikan diberi pakan berupa pakan komersial dengan kadar protein ±40%, pemberian pakan dua kali sehari (pagi dan sore) at satiation. Penggantian air dan penyiponan dilakukan dua hari sekali sebanyak 10% dari volume total dalam akuarium. Hasil penelitian menunjukkan bahwa perlakuan tanpa aerasi berpengaruh nyata terhadap respons biometrik dan fisiologis juvenil ikan gabus. Media tanpa aerasi memberikan hasil yang lebih baik ditunjukkan oleh kelangsungan hidup (92%), laju pertumbuhan spesifik (6,73%/ hari), efisiensi pakan (78,22%), retensi protein (41,91%), retensi energi (30,81%), kadar albumin (6,60 g/100 mL), dan hemoglobin (5,85 g/dL) yang lebih tinggi, sedangkan kadar kortisol (219 ng/L) dan glukosa darah (43,36 mg/100 mL) yang terendah. Kata kunci: media sulfat masam, pertumbuhan, aerasi, Channa striata
Application of gamal Gliricidia sepium leaves compost as depuration agent of leads (Pb) in the body organ of red tilapia Oreochromis sp.
Authors: Robin , , Nirmala Kukuh , Harris Enang , Affandi Ridwan , Jusadi Dedi
Published: August 2017

ABSTRACT  This study was aimed to perform depuration of Pb contained in tilapia body. The experiments were conducted in aquarium using compost of Gliricidia sepium leaf at a concentration of 10g/L, 20 g/L, 30 g/L, 40 g/L, and 0 g/L (control). The result showed that Pb level in fish muscle immersed with compost of Gliricidia leaf at a dose of 30 g/L for five days successfully decreased to a safe limit for human consumption (<0.3 mg/kg). However, decrease of Pb level in fish liver and kidney to finally reach the safe limit required seven days. Decreasing level of lead in the organs of experimental fish along with the increasing level of Pb in compost and maintenance media indicated that Pb accumulated in fish were released into the maintenance media by compost through chelation process. To conclude, compost of G. sepium leaves can be used as the material for depuration of Pb in the body of tilapia Keywords: humic acid, fulvic acid, depuration, Gliricidia leaves, lead, red tilapia  ABSTRAK  Penelitian ini bertujuan untuk mendepurasi Pb yang terkandung di tubuh ikan nila. Percobaan dilakukan di dalam akuarium menggunakan kompos daun gamal pada konsentrasi 10 g/L, 20 g/L, 30 g/L, 40 g/L, dan 0 g/L (kontrol). Hasil penelitian menunjukkan bahwa, Pb di daging ikan yang direndam dengan kompos daun gamal pada konsentrasi 30 g/L selama lima hari, kadarnya menurun hingga batas aman untuk dikonsumsi manusia (<0,3 mg/ kg). Penurunan Pb di hati dan ginjal untuk mencapai kadar aman membutuhkan waktu yang lebih lama, yakni tujuh hari. Seiring dengan menurunnya kadar Pb dalam organ ikan uji, kisaran Pb dalam kompos dan media budidaya meningkat, menunjukkan bahwa Pb dari tubuh ikan dilepaskan ke media budidaya dan terjadi proses khelat oleh kompos. Dengan demikian, kompos daun gamal bisa digunakan sebagai bahan pendepurasi Pb dari tubuh ikan nila. Kata kunci: asam humat, asam fulvik, depurasi, daun gamal, timbal, nila merah
Supplementation of astaxanthin and vitamin E in feed on the development of gonads white shrimp broodstock Litopenaeus vannamei Boone 1931
Authors: Maulana Fajar , Arfah Harton , Istifarini Mita , Setiawati Mia
Published: August 2017

ABSTRACT

 

Increase production high quality of white shrimp Litopenaeus vannamei broodstock can be done with the addition of vitamin E or astaxanthin. A dose used was 350 ppm vitamin E, 500 ppm astaxanthin, combination of 350 ppm vitamin E, and 500 ppm astaxanthin, combination of 175 ppm vitamin E and 250 ppm astaxanthin. The purpose of this research was to evaluate the effect of astaxanthin and vitamin E supplementation with different dose in the feed on gonad maturity of white shrimp broodstock. Feeding of vitamin E and astaxanthin was performed in three times, at 06.00, 12.00 and 20.00 by as much as 2% of the shrimp weight. The results showed that combination of 175 ppm vitamin E and 250 ppm astaxanthin giving highest relative survival (100.00±0.00%), growth rate of broodstock shrimp (1.07±0.26%/day), the fastest maturity of first gonads level achieved 14 days (19.45 ±4.81%), maturity of fourth gonads level achieved 41 days, levels of spawning (33.33±8.33%), fecundity (87,000±2,000 eggs) and hatching rate (49±1.53%).

 

Keywords: astaxanthin, Litopenaeus vannamei, vitamin E.

 

 

ABSTRAK

 

Meningkatkan kualitas induk udang vaname Litopenaeus vannamei dapat dilakukan dengan penambahan vitamin E atau astaxanthin pada pakan. Tujuan penelitian ini adalah untuk mengetahui pengaruh pemberian astaxanthin dan vitamin E dengan dosis berbeda dalam pakan terhadap tingkat kematangan gonad calon induk udang vaname. Dosis yang digunakan 350 ppm vitamin E, 500 ppm astaxanthin, 350 ppm vitamin E, dan 500 ppm astaxanthin, 175 ppm vitamin E dan 250 ppm astaxanthin. Pemberian pakan dengan penambahan vitamin E dan astaxanthin dilakukan sebanyak tiga kali, yaitu jam 06.00, 13.00, dan 20.00 WIB sebanyak 2% dari bobot udang. Hasil menunjukkan bahwa perlakuan terbaik didapatkan pada pemberian kombinasi 175 ppm vitamin E dan 250 ppm astaxanthin dengan tingkat sintasan induk udang 100,00±0,00%, laju pertumbuhan spesifik induk udang 1,07±0,26%/hari, kematangan gonad pertama tercepat dicapai pada 14 hari sebanyak 19,45±4,81%, kematangan gonad keempat didapat pada hari ke-41, tingkat pemijahan 33,33±8,33%, fekunditas 87.000±2.000 telur, dan derajat penetasan telur mencapai 49±1,53%.

 

Kata kunci: astaxanthin, udang vaname Litopenaeus vannamei, vitamin E
Student and Faculty Perceptions of OpenStax in High Enrollment Courses
Authors: Watson C. Edward , Domizi Denise P. , Clouser Sherry A.
Published: August 2017

As public funding for higher education decreases and the cost to students to attend college increases, universities are searching for strategies that save students money while also increasing their chances for success. Using free online textbooks is one such strategy, and the OpenStax College initiative at Rice University is one of the most widely recognized producers of such materials. Through a mixed method approach, this article examines the student and faculty experiences of adopting and using an OpenStax textbook. With 1,299 student participants, it was found that students greatly value the quality, attributes, and the cost of the OpenStax Biology textbook, though minor concerns were raised about its online format. Faculty adoption of a free textbook provides unique opportunities for course redesign and improvement, and the approach employed in this course transformation context resulted in clearly articulated learning outcomes, a fully realized structure in the course’s learning management system, and improvements to instructional practice. The student, faculty, and course benefits of this study offer a compelling argument for the adoption of high quality open education resources (OER) in public higher education contexts.
Revisiting Sensemaking: The case of the Digital Decision Network Application (DigitalDNA)
Authors: Archer Elizabeth , Barnes Glen
Published: August 2017

During this age of data proliferation, heavy reliance is placed on data visualisation to support users in making sense of vast quantities of information. Informational Dashboards have become the must have accoutrement for Higher Education institutions with various stakeholders jostling for development priority. Due to the time pressure and user demands, the focus of development process is often on designing for each stakeholder and the visual and navigational aspects. Dashboards are designed to make data visually appealing and easy to relate and understand; unfortunately this may mask data issues and create an impression of rigour where it is not justified. This article proposes that the underlying logic behind current dashboard development is limited in the flexibility, scalability, and responsiveness required in the demanding landscape of Big Data and Analytics and explores an alternative approach to data visualisation and sense making. It suggests that the first step required to address these issues is the development of an enriched database which integrates key indicators from various data sources. The database is designed for problem exploration allowing users freedom in navigating between various data-levels, which can then be overlaid with any user interface for dashboard generation for a multitude of stakeholders. Dashboards merely become tools providing users and indication of types of data available for exploration. A Design Research approach is shown, along with a case study to illustrate the benefits, showcasing various views developed for diverse stakeholders employing this approach, specifically the the Digital Decision Network Application (DigitalDNA) employed at Unisa.
Massive, Open, Online, and National? A Study of How National Governments and Institutions Shape the Development of MOOCs
Authors: Tømte Cathrine Edelhard , Fevolden Arne Martin , Aanstad Siri
Published: August 2017

We explore interpretations of MOOCs around the globe and, in particular, interpretations of MOOCs in Norway. Based on a review of previous studies relevant to these topics, we present two contrasting views on the emergence and development of MOOCs, namely the global interruption view and the national mediation view. We suggest, based on previous studies that MOOCs seem to follow national paths more than global paths. In order to grasp the diversity of understandings of MOOCs, we developed a framework that embraces various aspects of motivation, context, and structure regarding MOOCs. With these two polarised views of MOOC development (the global interruption view and the national mediation view), and the framework serving as an analytical approach, we looked at Norway and analyzed the understandings of the development of MOOCs within this particular national context. The national government seems to have been important in the development of the present MOOCs in Norway, both by organizing a particular group of experts in a dedicated commission to consider the future of MOOC in Norway, and by initiating and giving financial support to the development of MOOCs.
Learner Behaviour in a MOOC Practice-oriented Course: In Empirical Study Integrating TAM and TPB
Authors: Yang Hsi-Hsun , Su Chung-Ho
Published: August 2017

Few practice-oriented courses are currently integrated into online learning platforms, such as OpenCourseWare, Khan Academy, and Massive Open Online Courses (MOOCs). It is worthwhile to explore how learners respond to information technology and new teaching methods when practice-oriented course are placed online. Therefore, this study probes learner willingness to participate in a practice-oriented course distributed through a MOOC platform, investigating relationships among perceptions, behavioural intentions, and actual behaviour. The current research framework integrates the Technology Acceptance Model and the Theory of Planned Behavior as its core theoretical basis. Empirical data were collected through a cross-section survey. All participants were students of 2D Animation Production, with a total of 272 respondents. The questionnaire data used Partial Least Squares Structural Equation Modeling (PLS-SEM) analysis. Results show: (a) attitude exerted the greatest influence on learners’ behavioural intention; (b) learners’ perceived behaviour control, subjective norm, and attitude, which directly and positively influence their behavioural intention; (c) behavioural intention exhibited dual mediation effects; (d) behavioural intention positively influenced actual behaviour in the C-TAM-TPB model, with a high level of overall model fit.
The Effects of Extraneous Load on the Relationship Between Self-Regulated Effort and Germane Load Within an E-Learning Environment
Authors: Lange Christopher , Costley Jamie , Han Seung-Lock
Published: August 2017

Online instructors need to avoid unclear and confusing explanations of content, which can reduce the quality of learning. Extraneous load is reflective of poor instruction, in that it directs student effort towards processing information that does not contribute to learning. However, students may be able to manage poor instruction through effort regulation. Students who show high levels of effort have been shown to overcome poor instruction in some cases. This study analyzed survey responses from South Korean university students studying online (n = 1,575) to examine the relationship between self-regulated effort and germane load within varying extraneous load conditions. The experimental design separated extraneous load responses into three conditions (low, medium, high). Within each extraneous load condition, self-regulated effort responses were also separated (low, medium, high). The results showed that as extraneous load increased, self-regulated effort had a weaker relationship with germane load. It was also found that the use of effort regulation is effective only when dealing with low and mid-level extraneous load situations and that use of such strategies within high extraneous load situations was not effective. These results show the importance of improving instruction to reduce extraneous cognitive load, in that, not even high levels of effort can overcome poor quality instruction.
Repositories of Open Educational Resources: An Assessment of Reuse and Educational Aspects
Authors: Santos-Hermosa Gema , Ferran-Ferrer Núria , Abadal Ernest
Published: August 2017

This article provides an overview of the current state of repositories of open educational resources (ROER) in higher education at international level. It analyses a series of educational indicators to determine whether ROER can meet the specific needs of the education context, and to clarify understanding of the reuse of open educational resources (OER) provided by ROER. The aim of the study is to assess ROER by combining these two perspectives, and to form a basis for discussion among the universities that are responsible for these repositories.

The method was based on content analysis and consisted of two phases: an exploration of international sources, and an analysis of 110 ROER using the proposed set of indicators. The results focus on data from the analysis of ROER websites and some models of good practices. They are presented according to three core dimensions for evaluating ROER: general factors to establish types of ROER, a focus on drivers for OER reuse, and a focus on educational aspects.  It was found that most of the ROER that included one or more of the proposed reuse indicators were created exclusively for educational resources. Educational aspects are not yet firmly embedded into ROER. The few repositories that seem to have successfully included them are those that provide other educational metadata and use educational standards.
Supporting Capacity Building in Health Service Provision in Eritrea via Distance Learning Master’s Programmes: The Challenges and Rewards
Authors: Corlett Jo , Martindale Linda
Published: August 2017

A qualitative study investigating the experiences and effects on practice of Eritrean healthcare professionals studying for a postgraduate degree by distance learning is reported. The programme is delivered via online learning together with in-country teaching visits. Two focus group discussions with 19 postgraduate students were conducted. Online learning is challenging due to intermittent connectivity and power cuts, but students have developed their own solutions to overcoming these difficulties. Thematic analysis generated four themes. Students who are embedded within the Eritrean context are experiencing a process of self-development, both academic and personal. This self-growth is facilitating the development of resilience and confidence building, enabling students to have a positive influence on health service provision, thus impacting on the Eritrean context. Students are developing life-long skills that will support the continuing development of healthcare systems in Eritrea long after they have completed their distance learning programme.
Analysis of Buccal Cortical Plate Thickness for Placement of Mini-Implants – A CBCT Study
Authors: David Roopak Mathew , Ranjan Raghu , M R Dinesh , R M Dharma , B C Amaranth , Arjunan Sharmila
Published: August 2017

The purpose of this study was to quantitatively evaluate buccal cortical bone thickness in the maxilla and mandible so as to provide guidelines for mini-implant placement. Cone beam computed tomographic scans of thirty patients (Age 16-30 years) were collected from preorthodontic records. Each measurement area was coded with a number beginning in the maxillary right quadrant distal to the second molar with number 1 and ending in the mandibular right quadrant distal to the second molar with number 30. For analysis these measurement areas were also grouped as sextants. Three measurement points were then defined at 2 mm, 4 mm and 6 mm from the alveolar crest in each measurement. The measuring locations were recorded on the four quadrants, resulting in 90 locations in the buccal cortical plate of maxillary and mandibular arch. The region of interest was explored at each measuring location of the 30 sites using Galileos software. The optimal site for miniimplant placement in the anterior region is between the central and lateral incisors in the maxilla and between the lateral incisor and the canine in the mandible at the 6-mm level from the alveolar crest. At the buccal aspect of the posterior region of both jaws, the optimal sites are between between the first and second molars i.e. in the Maxillary arch at 4 mm level on the right side and left side and in the Mandibular arch at 6 mm level on the right side and left side. 
At Attention: What Student Veteran Mission Statements Say About Public Flagships
Authors: Taylor Zachary W
Published: August 2017

Expanding Wilson, Meyer, and McNeal’s (2012) work focusing on university mission statements, this study further explicates the values expressed by public flagship institutions (n = 50) through the linguistic examination of student veteran services mission statements disseminated by student veterans services offices, representing a gap in the literature. A quantitative linguistic analysis reveals only 24% of student veteran services offices feature official mission statements on their websites, these mission statements do not support extant research or the U.S. Department of Education’s guidelines for supporting student veterans, and mission statements do not directly address student veterans, evidenced by first- and third-person pronouns. Implications for student veteran support and adult learning are addressed.
Simulation Nongravitational Dynamic of Cometary Orbit
Authors: Arsini Arsini , Saefan Joko , Farchani Rosyid Muhammad
Published: August 2017

The tail formation of a comet near the sun leads to the situation in which the comet continually losses a part of its masses so that the mass of the comet decreases monotonically. A comet may also accrete the material encountered along its orbit so that its mass increases. Therefore, the mass of a comet can be regarded as a function of time. In this work we study simulation the dynamics of the orbit of a comet due to the lost of its mass along the formation of its tail and the material accretion along its orbit. Here, we assume that the comet under consideration is of the form of a ball and rotates so rapidly that the whole of its surface catches the radiation of the sun equally.
Bending Properties of Elephant Grass Fiber Reinforced Epoxy Resin Composites
Authors: Nurhayati Alwiyah
Published: August 2017

Elephant grass fiber reinforced epoxy resin composites has been made and characterized on its mechanical properties that is bending properties. The specimen made by varying its filler’s volume fraction. The elephant grass fiber  treated by immersing in water for 3 days continued by beating the strips gently in order to loosen and separate the fiber and scrapped with sharp knife and combed until individual fibers were obtained and cut uniformly in 2 cm length and 1 mm diameter width average. Hand lay up process used to prepare the composite specimens with 1%,  3% and 5% volume fraction. This method is the simplest method and require a low cost. The dimensions of the specimens used to carry out the test adapted from ASTM D 3379-75 for Bend testing. The results showed that filler volume fraction has effect to its bending strength. Specimen with 1% filler volume fraction has the highest bending stress whereas 5% filler volume fraction specimen has the highest elasticity modulus value.
Silage production technology using grass thickening vibratory method
Authors: Jotautienė Eglė , Jasinskas Algirdas , Kučinskas Vytautas , Steponavičius Dainius
Published: August 2017

The article presents silage production technology using vibratory method. The objective of this research was to quantify the selected theoretical model by comparison to experimental results and to determine more reasonable calculations methods for practical issues. Based on the classical theory of mechanical oscillations a numerical analysis of silages thickening by vibrator was developed. Using the developed numerical model, the vibrator operational characteristics were obtained. Numerical and experimental investigation was performed using a direct-action vibrator to compact chopped maize. A comparison between the experimental and numerical results is presented. The results can be used to determine technical characteristics of the vibrator for silage thickening dynamics. The obtained system parameters can be used to prepare technical tasks for selection of vibratory silages thickening equipment.
Numerical simulation and optimization for the vibration of the seed metering device based on a novel ML-IGA method
Authors: Xu Yan Lei , Wang Qi , Zhu Long Tu , Huang Dong Yan
Published: August 2017

The reported researches only analyze vibration parameters of the seed-metering device. However, they do not adopt any algorithm to conduct a multi-objective optimization for the vibration performance of the seed-metering device. In this paper, the vibration of the seed-metering device is numerically computed firstly, and the correctness of the computational model is validated by experimental test. Then, some parameters including the plate thickness, inclination angle, excitation source position and supporting leg thickness of the seed-metering device are studied. In this way, those parameters which have serious impacts on the vibration are obtained. Therefore, the vibration performance is tried to optimize using these parameters as the design variables. This paper proposes a novel multi-layer immune algorithm based on genetic algorithms (ML-IGA). In order to further verify validity of the novel ML-IGA model for optimizing the vibration of the seed-metering device, it is compared with the traditional GA model and PSO-GA model. When the iteration of ML-IGA model was conducted to the 156th generation, the predicted error is smaller than the set critical error. Compared with other two kinds of algorithms, the optimized time is reduced. Regarding optimization of the GA model, the vibration amplitudes are increased by 2.49 % and 4.22 % respectively. Regarding optimization of the PSO-GA model, the vibration amplitudes are increased by 9.74 % and 6.024 % respectively. Regarding optimization of the ML-IGA model, the vibration amplitudes are increased by 17.34 % and 6.78 % respectively. Obviously, structures with better performance can be obtained through using the novel ML-IGA model.
Effects of SSI on seismic responses of unequal height pier bridge
Authors: Lv Yang
Published: August 2017

Based on the secondary development of LS-DYNA program, the nonlinear dynamic p-y model and Bonora damage material model of steel were applied in the main program. Taking a four-span approach bridge as an example, the plastic damage model of the upper bridge and four simplified bridge pile-foundation models, including beam on Winkler foundation model, effective length pile model, total pile model considering soil-structure interaction (SSI) and no pile model, were introduced. The earthquake motions obtained by a free-field analysis were applied to the different depth of pile profile. The free vibration characteristics, displacement, internal force and damage under different levels of earthquake motions were analyzed. The stress-strain curve of different depth of p-y elements and pile deflection of Winkler-methods model were discussed. Analysis results indicated that the structure responses are different among the four pile-foundation models, the responses of the bridge in longitudinal and transverse directions are totally different, and the p-y model can be used to simulate the bridge precisely.
Structural multi-damage identification based on strain energy and micro-search artificial fish swarm algorithm
Authors: Guo Huiyong
Published: August 2017

A two-stage damage detection method based on strain energy and micro-search artificial fish swarm algorithm (MSAFSA) is presented for solving structural multi-damage problem. First, structural modal strain energy and energy dissipation process are analyzed and an improved modal strain energy dissipation ration index (IMSEDRI) is proposed to preliminarily detect suspected damage elements. Then, artificial fish swarm algorithm (AFSA) is used to identify damage extent of suspected damage elements. In general, the search efficiency of a basic AFSA isn’t very efficient for the search procedure. So, a micro-search artificial fish swarm algorithm is presented in this paper. The simulation results demonstrate that the damage detection method can estimate the damage locations and extent with good accuracy, and the calculated results of the proposed MSAFSA are obviously superior to those of both the basic AFSA and the AFSA with visual-step change strategy.
Fatigue crack monitoring of aerospace structure based on lamb waves and binary tree support vector machines
Authors: Lu Shenbo , Zhou Li
Published: August 2017

To overcome the difficulty in identifying the fatigue crack in key parts of aerospace structure, a kind of methods aimed to monitor the crack length based on matching pursuit (MP) method and binary tree support vector machines (BT-SVM) classification algorithm was developed. In this method, Lamb wave signals were decomposed into a linear combination of several Chirplet atoms by MP method, and then the matching parameters were extracted as feature vectors for training and testing in BT-SVM classification algorithm. At the same time, a lug joint model was created with a certain ratio and the effect of crack extension on Lamb wave signals propagation was studied. At last, fatigue loading experiments were carried out in lug joints and tail reinforced frames of aircraft. The results showed that this method can monitor the length of fatigue crack effectively, which presents a new approach for monitoring the fatigue crack.
Fracture mechanism of air percussive rotary bit matrix based on impact stress wave theory
Authors: Huang Zhiqiang , Ma Yachao , Qiu Chengsong , Li Qin
Published: August 2017

An air percussive rotary bit is a key component of air percussive rotary drilling technology, and its fracture failure seriously affects the safe operation and economic efficiency of drilling. This paper presents (1) theoretical analysis of the impact stress wave propagating in the air percussive rotary bit and effect of the stress wave on bit fracture and (2) finite element simulation study based on the stress wave theory which builds a model of the air hammer piston, drill and rock, defines material parameters, meshes and defines boundary conditions, clarifies propagation characteristics of the impact stress wave, analyzes stress characteristics of the bit matrix under different conditions (same drilling pressure and same piston speed, different drilling pressure and same piston speed and same drilling pressure and different piston speed) and determines the main factors of bit matrix fracture. The correctness of the theoretical analysis was verified with simulation results and fundamental ways of preventing bit fracture failure were proposed to provide a theoretical basis for the structural optimization design of a new bit. The results show that a bit section mutation is the root cause for the shock of the impact wave and the change in nature of the wave during propagation. The tensile wave is the root cause for bit matrix fracture, and a breakage is the most serious at stomatal interchanges. With increasing drilling pressure and piston speed, the rate of increase in the peak stress of the bit matrix increases, leading to early fatigue fracture of the bit matrix. The fracture of the bit matrix can be reduced, and the bit life can be extended by rationally designing the bit sectional structure parameters, ensuring that the bit withstands the effects of the compression wave so as to reduce the formation of a tensile wave, and rationally choosing drilling process parameters (such as drilling pressure and air pressure).
Lamb waves defects imaging research based on multi-parameter compensation and pixel optimization
Authors: Li Peijiang , Zhu Xiaojin , You Ting , Zhang Hesheng , Gao Zhiyuan
Published: August 2017

Ultrasonic guided waves detecting technology has promising application prospects in structural health monitoring. In order to detect defects in the aluminum sheet, a kind of defect localization imaging algorithm, combining multi-parameter compensation and pixel partitioning optimization is proposed in this paper. Based on the analysis of imaging principles, the waveform signal of time domain was mapped onto the wavenumber domain through a backward propagation compensation, so dispersion parameters can be compensated. Reference signal compensation can be achieved by the baseline signal differential method from wavenumber domain, which overcame influences of environmental changes. During the imaging process, a reasonable threshold was used for pixel partitioning and optimization to improve image quality. Experimental results demonstrated that positioning error about the algorithm is small, defects imaging of sheet is clear and intuitive, this optimization and compensation of guided-wave defects imaging can be used in structural health monitoring.
Analysis of partial-body and whole-body static sitting comfort
Authors: Xu Zhongming , Yuan Quan , Huang Shenrong , Zhang Zhifei , He Yansong
Published: August 2017

The whole-body comfort sensation was moderately to highly correlated with local body part comfort sensation in both sitting and driving, in order to understand what exact relationship exists between them, the seating comfort evaluations under the stimulus of four body parts (i.e. backs, waist, hips and thighs) were carried out for 15 subjects separately, subjective ratings on both partial-body and whole-body comfort are derived under different conditions. Impact factor (IF) of the partial-body comfort to whole-body comfort is calculated by the linear regression method, and the main variables are obtained by the stepwise regression algorithm. The most significant local body part in influencing whole body comfort is found at the region of hips, followed by backs, waist and hips. With impact factor analysis on partial body comfort, the results show that the local comfort feeling of waist is most potential to be influenced by other body parts, while the comfort sensitivity of thighs is the lowest.
Research on vibration localization of mistuned bladed disk system
Authors: Zhang Hongyuan , Yuan Huiqun , Yang Wenjun , Zhao Tianyu
Published: August 2017

In order to assess the vibration localization influences of different parameters of structural of the mistuned bladed disk system, the pre-stressed component mode synthesis method was adopted, and reduced-order models (ROMs) of the aero-engine compressor bladed disk system were built. Identification of the mistuning parameter was set based on the combination of blade static frequency, dichotomy and finite element analysis method. By Defining the vibration localization factor, the influence parameters such as the engine orders of excitation, mean frequency and stiffness ratio were considered, localization characteristics of the vibration response was analyzed, and the influence rule of different parameters on the vibration response were discussed. The result shows that the engine orders of excitation has significant influences on the frequency, displacement and strain energy distribution, with the increase of the engine orders of excitation, the relative localization factors firstly increase, and then decrease; the relative localization characteristics of the bladed disk system on the different mean frequencies were found out; with the increase of the stiffness ratio of the blade and disk, maximum vibration amplitude and strain energy of the bladed disk system gradually decline.
Effect of the blade outlet angle on unsteady characteristics of a single channel pump
Authors: Tan Minggao , Zhu Zhipeng , Liu Houlin , Wu Xianfang , Feng Jinsheng
Published: August 2017

To study the effect of β2 on energy performance and unsteady characteristics of the single-channel pump, the experimental tests about the energy characteristics, head pulsation, pressure fluctuation and radial force have been conducted by the synchronous test. 3 different impellers with the blade outlet angle β2 of 8°, 16° and 25° respectively are studied. The results show that with the increase of β2 from 8° to 25°, the head increases gradually and the maximum increase amplitude reaches 22.6 %. As β2 changes from 8° to 25°, there is a maximum efficiency. The mixing loss at the impeller outlet can be decreased by reducing β2. With the increasing of β2, the minimum head in time domain gradually lag and the maximum head gradually advances. The pressure fluctuation in each measuring point shows the trend of increasing first and then decreasing with the increasing of the flow rate. With β2 increasing, the radial force also increases and the maximum increase amplitude of minimum radial force is larger than 8 %. The research can provide some reference for the optimization of single channel pumps.