bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determination of student opinions in augmented reality
Authors: Bicen Huseyin , Bal Erkan 
Published: November 2016

The rapid development of the new technology has changed classroom teaching methods and tools in a positive way. This study investigated the classroom learning with augmented reality and the impact of student opinions. 97 volunteer undergraduate students took part in this study. Results included data in the form of frequencies, percentages and descriptive statistics. The results show that, with gamification methods, augmented reality content affected studentsâ€™ opinions in a positive way. When QR codes are used in the classroom, students feel independent from classroom materials and can access various resources. Moreover, students think that, when augmented reality in the classroom is used, education is more enjoyable.Â Keywords: Augmented reality; gamification; opinions; students
The educational use of facebook as a social networking site in animal physiology classes
Authors: Koseoglu Pınar , Mercan Gamze 
Published: November 2016

This study aims at performing a sample application of educational use of Facebook as a social networking site in Animal Physiology classes, and at determining sudentsâ€™ views on the application. The research sample was composed of 29 third year undergraduate students attending the Biology Education Department of Hacettepe University. The Applied part of the research was performed in the Spring semester of the 2014-2015 academic year in Animal Physiology classes. A Facebook group called â€œBIO 314 Animal Physiologyâ€ was created for sharing purposes in relation to the course content, and the lecturer as well as the students sharedÂ several times in the group for fourteen weeks and they made comments on instances of sharing.Â Besides, the lecturer assigned the students tasks for the activities and the students were expected to fulfill the tasks. Studentsâ€™ views were obtained through a survey of open-ended questions prepared as the tool of data collection and then the views were put to qualitative analysis. The results showed that the use of Facebook for educational purposes made such things as sharing, helping each other, increasing communication, reaching the lecturer and visualising the content easier for students but that there were also students holding negative views on the issue.
Student Dropout at the Hellenic Open University: Evaluation of the Graduate Program, "Studies in Education"
Authors: Vergidis Dimitris , Panagiotakopoulos Chris 
Published: November 2016

<p>
This study traces the root causes of dropout rates in one post-graduate course “Studies in Education,” offered by the Hellenic Open University (HOU). From our research findings, it was found that the main cause of dropping out stem from a combination of adult learners’ obligations, specifically balancing their academic workload with their employment commitments and family obligations (mainly for female students). The second reason for dropout rates among adult distance education learners include students’ miscalculation of the available time for studying and their underestimation of the extra effort required for effective learning. These reasons can be compared to the educational material, which, in general, was not considered overly difficult and did not appear to compel students to abandon their studies.
</P>

<P><B>Key terms:</B> dropout, distance education, adults education</P>
Greenhouse Gas Emissions from Stored Dairy Slurry from Multiple Farms
Authors: Le Riche Etienne L. , VanderZaag Andrew C. , Wood Jeffrey D. , Wagner‐Riddle Claudia , Dunfield Kari , Ngwabie N. Martin , McCabe John , Gordon Robert J. 
Published: November 2016

A significant need exists to improve our understanding of the extent of greenhouse gas emissions from the storage of livestock manure to both improve the reliability of inventory assessments and the impact of beneficial management practice adoption. Factors affecting the extent and variability of greenhouse gas emissions from stored dairy manure were investigated. Emissions from six slurries stored in clean concrete tanks under identical “warm‐season” conditions were monitored consecutively over 173 d (18°C average air temperature). Methane (CH4) emissions varied considerably among the manures from 6.3 to 25.9 g m−2 d−1 and accounted for ∼96% of the total CO2 equivalent greenhouse gas emissions. The duration of the lag period, when methane emissions were near baseline levels, varied from 30 to 90 d from the beginning of storage. As a result, CH4 emissions were poorly correlated with air temperature prior to the time of peak emissions (i.e., the initial 48 to 108 d of storage) but improved afterward. The air temperature following the time of the peak CH4 flux and the length of the active methanogenesis period (i.e., when the daily CH4 emissions ≥ 7.6 g m−2 d−1) were highly correlated with CH4 emissions (R2 = 0.98, p < 0.01). Methane conversion factors (MCFs) ranged from 0.08 to 0.52 for the different manures. The MCFs generated from existing CH4 emission models were correlated (R2 = 0.68, p = 0.02) to MCFs calculated for the active methanogenesis period for manure containing wood bedding. A temperature component was added that improved the accuracy (R2 = 0.82, p < 0.01). This demonstrated that an improved understanding of lag period dynamics will enhance stored dairy manure greenhouse gas emission inventory calculations.Core Ideas
CH4 emissions and MCFs from six dairy slurries varied despite identical storage conditions.
Postpeak CH4 emissions were more consistent among slurries compared with prepeak periods.
CH4 emissions represented ∼96% of the overall GHG budget.
N2O emissions were low but represented an 8× greater portion of the GHG budget for tie‐stall than free‐stall systems.
Resilience and Life Expectations of Perinatally HIV-1 Infected Adolescents in France
Authors: Funck-Brentano Isabelle , Assoumou Lambert , Veber Florence , Moshous Despina , Frange Pierre , Blanche Stéphane 
Published: November 2016

Background:Resilience of perinatally HIV-infected youth in European countries is poorly studied. Life satisfaction and expectations for adulthood are rarely examined.Objective:This cross-sectional, descriptive study of a French cohort of 54 perinatally HIV-infected adolescents raised in France (age 14-20 years) aimed to (1) evaluate their psychosocial adjustment, (2) identify their expectations for adulthood and (3) delineate risk and protective factors associated with mental health, life satisfaction, and HIV-1 viral load level.Method:Medical evaluation, psychological semi-structured interview, and self-report questionnaires were used.Results:All the adolescents had been receiving Highly Active Anti-Retroviral Therapy (HAART) for 9 to 11 years and 2/3 were healthy with controlled viral load (<50 copies/mL). The majority had medium to high levels of life satisfaction. They viewed HIV as having only minor impact on their current daily life and had positive expectations for adulthood. However, 46% exhibited psychiatric symptomatology. Multivariable analysis showed that having a deceased parent and current worries about HIV were substantial risk factors for psychiatric symptoms. Having two living parents and being satisfied with life were protective factors for mental health. Good quality of caregiver-adolescent relationships and high life satisfaction were significant protective factors for controlled viral load.Conclusion:These data indicate psychosocial resilience among perinatally HIV-1 infected adolescents with 10 years of HAART treatment. These findings demonstrate the influence of life satisfaction, parent’s life status and quality of caregiver-adolescent relationships on resilience and health outcomes in these patients. We conclude that healthcare providers should attend to these factors.
Prevalence of the Infertility Among Couples in Ouagadougou (Burkina Faso): a Population-based Survey
Authors: Eric Somé Nagaonlé , Justine Boncoungou , Jean Noël Poda 
Published: November 2016

Background:
Worldwide, 10 to 15% of couples are infertile. In Burkina Faso, there has never been a population-based prevalence study regarding infertility.

Objective:
To determine the prevalence and risk factors of infertility in Ouagadougou (Burkina Faso).

Method:
We conducted a cross-sectional study with prospective data collection on 480 households from March to May 2014 in Ouagadougou. In each household, both the men and the women of childbearing-age were interviewed by an investigator using a questionnaire. The main outcome was infertile men or women living in Ouagadougou.

Results:
The participant-reported infertility prevalence was 9.3% (95% CI: 7.0; 12.2) and 10.4% (95% CI: 7.9; 13.5) for men and women, respectively. The primary and secondary infertility prevalence rates were 4.8% (95% CI: 3.2; 7.2) and 4.4% (95% CI: 2.9; 6.7) respectively for men and 6.8% (95% CI: 4.8; 9.4) and 3.6% (95% CI: 2.2; 5.7) for women. Considering only infertile participants, primary infertility concerned 52.3% (95% CI: 37.2; 67.0) and 65.3% (95% CI: 50.6; 77.6) of men and women respectively.
The medically-diagnosed infertility prevalence was 2.9% (95% CI: 1.7; 4.9) in both men and women groups. The male and female-related infertility represented 35.7% (95% CI: 13.7; 66.0) and 42.9% (95% CI: 18.3; 71.6) of the cases respectively and the dual-factor-related infertility 21.4% (95% CI: 5.9; 54.0).

Conclusion:
Though lower than the global and Sub-Sahara African region’s prevalence, the infertility prevalence in Ouagadougou was still high. Compared to previous data in the same country, we saw a shift from predominant secondary infertility to predominant primary one. Infections remained the leading cause of infertility.
PENGEMBANGAN MULTIMEDIA INTERAKTIF UNTUK PEMBELAJARAN DESAIN BUSANA DI SMK
Authors: Pandansari Purwosiwi , Gafur Abdul 
Published: November 2016

Penelitian ini bertujuan untuk: (1) menghasilkan produk multimedia pembelajaran yang interaktif untuk peserta didik jurusan busana SMK Negeri 1 Depok, (2) menentukan kelayakan produk multimedia interaktif untuk peserta didik jurusan busana butik yang digunakan dalam pembelajaran desain busana, (3) menguji efektivitas multimedia interaktif untuk mata pelajaran mendesain busana. Penelitian ini adalah penelitian pengembangan (R&D) adaptasi model Alessi dan Trollip. Prosedur pengembangan meliputi tahap perencanaan, desain, dan pengembangan. Validasi oleh ahli media dan ahli materi untuk menguji produk dan mengeliminasi permasalahan prosedur, kesesuaiannya dengan tujuan, dan alur petunjuk penggunaan multimedia sesuai pembelajaran desain busana. Kelayakan mencapai skor 4,64 dengan kategori “sangat baik” untuk materi dan untuk media mencapai skor 4,16 dengan katagori “sangat baik” dan peserta didik dengan nilai rata-rata 4,54, Multimedia interaktif pembelajaran desain busana untuk kelas XI SMK Negeri 1 Depok efektif memotivasi kreativitas yang dimiliki peserta didik diketahui dari hasil belajar sebelum menggunakan multimedia dengan rata-rata nilai 72,4 dan hasil belajar setelah menggunakan multimedia rata-rata nilai 86,2.Kata kunci: multimedia, desain busana DEVELOPING INTERACTIVE LEARNING MULTIMEDIA FOR FASHION DESIGN AT SMKAbstractThis study aims to: (1) produce interactive learning multimedia which include design, material, display, and programming for students majoring in fashion SMK Negeri 1 Depok, (2) determine the feasibility of Interactive Multimedia covering aspects of the display, programming and material for Learners Department Clothing Boutique used in learning fashion design, and (3) Find out the effectiveness of Interactive Multimedia for learning fashion design. This type of research is research development (R & D) adapted from Alessi and Trollip models. The development procedure includes the planning, design, and development. Validation was done by expert media and materials experts to examine the feasibility of multimedia products and eliminate the problems procedures, suitability to the purpose, and the flow of instructions for use in accordance with learning multimedia for fashion design. The feasibility of achieving a score of 4.64 is in the "very good" category for the material and for the media reaches a score of 4.16 in the "very good" category and learners with an average value of 4.54. interactive learning multimedia fashion design for class XI SMK 1 Depok effectively motivates creativity of learners known from prior use of multimedia learning out comes with an average value of 72.4 and learning outcomes after using multimediathe average value 86.2.Keywords: multimedia, fashion design
PENGARUH PENGGUNAAN MEDIA MOOD BOARD TERHADAP PENGETAHUAN DESAIN BUSANA PADA MAHASISWA PENDIDIKAN TEKNIK BUSANA
Authors: Bestari Afif Ghurub , Ishartiwi Ishartiwi 
Published: November 2016

Penelitian ini bertujuan untuk menguji (1) perbedaan pengaruh pembelajaran Desain Busana menggunakan media mood board dan media contoh gambar desain busana terhadap kreativitas dan hasil belajar Desain Busana mahasiswa; (2) pengaruh positif pembelajaran Desain Busana dengan menggunakan media mood board dibandingkan menggunakan media contoh gambar desain busana terhadap kreativitas desain busana mahasiswa; (3) pengaruh positif pembelajaran Desain Busana dengan menggunakan media mood board dibandingkan dengan menggunakan media contoh gambar desain busana terhadap hasil belajar desain busana mahasiswa. Penelitian ini merupakan penelitian kuasi eksperimen dengan desain Pretest-Posttest, Nonequivalent Control Group Design. Penelitian ini menggunakan kelas eksperimen dan kelas kontrol. Populasi penelitian adalah mahasiswa kelas A dan D semester 2 di Pendidikan Teknik Busana FT UNY. Hasil t-test menunjukkan pretest mahasiswa kelas kontrol dan kelas eksperimen hampir sama. Data hasil belajar posttestmenunjukkan selisih skor rata-rata antara kelas eksperimen dan kelas kontrol berkategori sangat tinggi. Berdasarkan hasil nilai rata-rata diperoleh bahwa terjadi peningkatan hasil kreativitas mahasiswa yang signifikan.Kata kunci: media mood board, hasil belajar, desain busana THE IMPACT OF USING MOOD BOARD MEDIA TO FASHION DESIGN KNOWLEDGE ON FASHION DESIGN ENGINEERING STUDENTSAbstractThis research aimed to examine (1) the effect of differences in learning to use media Fashion Design mood board and fashion design drawings media examples in creativity and Fashion Design student learning outcomes; (2) the positive influence of learning by using media Fashion Design mood board than using media examples fashion design drawings for the creativity of fashion design students; (3) a positive influence of learning by using media Fashion Design mood board compared to using the media sample images for learning outcomes of Fashion Design student. This research is a quasi-experimental research with pretest-posttest design, Nonequivalent Control Group Design. This research uses experimental class and control class. The research population was a student of class A and D in the 2nd half of Technical Fashion Education Faculty of Engineering, Yogyakarta State of University. t-test results indicate student pretest control class and experimental class is almost the same. Data posttest study results show the difference in average scores between the experimental class and control class category is very high. Based on the results of the average value obtained that an increase in the creativity of the students are significant.Keywords: fashion mood boards, learning outcomes, fashion design
Synthetic Polymer Fracturing Fluid for Ultrahigh Temperature Applications
Authors: Song L. , Yang Z. 
Published: November 2016

Abstract
When wells with formation temperature above 180 °C are fractured conventionally, a large amount of water has to be pumped down ahead of time to cool down the formation, and also conventional fluids have to be stretched to the extreme limits of performance. The fractures obtained this way are often unsatisfactory. We have developed a new fracturing fluid which can be used for high temperature wells up to 230 °C without the need of cool-down.
This fracturing fluid is simply composed of a specially designed synthetic polymer as the gelling agent, a metal crosslinker such as a zirconium complex, a multi-functional environmentally friendly additive, and an oxidizing breaker. The fluid can be prepared in the same way as conventional guar fluids. Made in an invert emulsion form, the gelling agent hydrates quickly, allowing for on-the-fly operation with no need of extra hydration equipment and time. With the unique combination of the environmentally friendly additive and the zirconium crosslinker, the crosslinking of the system is well delayed and controlled as well as the stability of the fluid is satisfactorily maintained at high temperatures. More interestingly, the spike of the apparent viscosity at the early stage of crosslinking is nicely damped, leading to a "flat" viscosity profile. Low concentrations of the gelling agent are needed for the fluid systems. Low concentration of gelling agent and controlled delay of crosslinking lead to maximally reduced friction pressure. The fluid can be broken by the oxidizing breaker in a controlled way. Free of typical residues associated with guar-type fracturing fluids, the post-frac cleanup of this fluid is more complete. Lab data of hydration, rheology, retained conductivity, etc. will be presented and discussed.
Lesson Learned from an Unsuccessful Multi-Stage Fracturing Case and an Improved Completion Design in Thin-Interbed Reservoirs in Tarim Basin, China
Authors: Huifeng Liu , Xiangtong Yang , Jiangyu Liu , Pengyao Zhou , Dengfeng Ren , Sheng Yin 
Published: November 2016

AbstractHorizontal wells with multi-stage fracturing have been proved to be an efficient technology to exploit thin-interbed reservoirs. However, problems were encountered during multi-stage fracturing of horizontal wells in the Silurian reservoir in Ta-zhong Oilfield, western China. This paper mainly discussed the causes of these problems and the optimized completion and fracturing designs to avoid these problems.Ta-zhong Silurian reservoir is a thin-interbed, low-permeability reservoir with buried depth from 4000 to 4500m. The sand distribution is heterogeneous both vertically and horizontally. A horizontal well in this reservoir was fractured twice using two different multistage fracturing technologies, firstly hydraulic jetting fracturing and then packer-segregated fracturing. Abnormal pumping pressure and difficulties to add proppants were encountered in both of the two operations. The causes to these failures will be analyzed comprehensively, based on which an optimized multi-stage fracturing design of this well will be proposed through numerical modeling and analysis.According to the analysis, defective completion and fracturing design is the main cause of the failures experienced in the two operations. The ill-considered jetting parameters caused the difficulties of fracture propagation and proppant placement during the hydraulic jetting fracturing treatment, whereas inappropriate perforating intervals led to simultaneous initiation of multiple fractures in each stage during the packer-segregated fracturing treatment. These fractures interfered with each other and led to great near-wellbore pressure losses and fracture reorientation, and then resulted in abnormally high pumping pressure and challenges of proppant placement. Several changes to avoid these problems are proposed and incorporated in a new multi-stage fracturing design. The jetting parameters, fracture spacing, fracture geometries as well as perforation parameters are all optimized by numerical modeling in the new design of well A and other horizontal wells in Ta-zhong Silurian reservoir, which is expected to avoid the above-mentioned problems and obtain better results.Nowadays, horizontal wells with multi-stage fracturing are a common-used technology in tight thin-interbed formations. However, the design of segregated completion and multi-stage fracturing is still a challenge for such formations. This paper introduced the lessons learned from a failure case and proposed an optimized completion and fracturing design, therefore provided a good reference for completion design of the wells in Ta-zhong Silurian reservoir as well as similar reservoirs in the world.
Vertical Well Completions in Multilayer Reservoirs: A Decade of Technologies Implemented in Argentina
Authors: Bonapace Juan Carlos , Perazzo Gerardo 
Published: November 2016

Abstract
Many fields in Argentina have multilayer reservoirs that require various stimulation techniques, mainly hydraulic fracturing. A variety of formations and types of reservoirs, such as conventional (mature fields) and unconventional (tight gas and shale), are present in the Golfo San Jorge and Neuquen basin. The hydraulic fractures created in these basins present a variety of conditions and challenges related to depth, well architecture design, bottomhole temperature (BHT), reservoir pressure, and formation permeability.
In the last decade, new technologies were introduced and developed to help achieve greater efficiency and reduce time and costs associated with completions for these fields. This paper presents experiences gained using two types of technologies.
First, a new conventional straddle-packer system (SPS) was used in conjunction with a workover unit, which was part of a technological collaboration agreement between an operator and service company. It was mainly applied in conventional reservoirs, mature fields, in wells with up to seven fracture stages, and in new or recompletion wells. Second, a pinpoint technique was used, called hydrajet perforating annular-path treatment placement and proppant plugs for diversion (HPAP-PPD). This technique was applied in new wells (rigless completion) and all types of reservoirs, both conventional and unconventional (tight gas and shale), and allowed performing up to 30 separate fracture stages in a single well, with three stages completed in a 12-hr operation.
These completion methods allowed operators to focus treatments in desired zones with specific treatment designs based on reservoir characteristics. Several case histories are presented for different basins, formations, and reservoirs types, as well as lessons learned and completion time reductions.
Reliable Reconstruction of a Macrovelocity Model via Reflected Full Waveform Inversion with Modified Cost Function
Authors: Tcheverda Vladimir , Chavent Guy , Gadylshin Kirill 
Published: November 2016

Abstract
The paper develops a reliable numerical method to solve inverse dynamical problem of seismic waves’ propagation on the base of nonlinear least squares formulation which is widely known as Full Waveform Inversion (FWI). The key issue on this way is correct reconstruction of macrovelocity component of the model with input seismic data without time frequencies less than 5 – 7 Hz and reasonable source – recievers offsets. To provide correct macrovelocity reconstruction we modify regular nonlinear least squares formulation used in standard versions of FWI by decomposing the model space into two subspaces
slowly varying in space functions (propagators p) which do not change direction of propagation of seismic energy, but governs travel times; sharply changing in space functions (space reflectivity r) which do not change travel time, but turn propagation direction towards acquisition.
In turn this reflector is represented as application of migration operator to new unknown called time reflectivity s connecting with space reflectivity by migration operator M(p):
This decomposition modifies the cost function in the following way:
which opens the possibility to implement minimization with respect to propagator and reflectivity as two different step-by-step processes.
We present results of comparative analysis of numerical Singular Value Decompositions for both cost functions which reveal much more sensititve of the modified one with respect to the perturbation of a space of propagators.
We use the modified cost function to do the FWI for well known Marmoussi2 dataset. The numerical results are presented and discussed.