Numerical modelling of CO 2 injection at small-scale field experimental site in Maguelone, France

2016 ◽  
Vol 54 ◽  
pp. 200-210 ◽  
Author(s):  
Farzad Basirat ◽  
Fritjof Fagerlund ◽  
Nataliya Denchik ◽  
Philippe A. Pezard ◽  
Auli Niemi
Keyword(s):  
Numerical Modelling ◽  
Small Scale ◽  
Experimental Site ◽  
Scale Field

Lessons Learned from Small Scale Field Test Demonstrating CO2 EOR and Geologic Storage at Wellington Field in Southern Kansas

2019 ◽  
Author(s):  
Yevhen Holubnyak ◽  
Willard Watney ◽  
Tiraz Birdie ◽  
Dana Wreath ◽  
George Tsoflias ◽  
...  
Keyword(s):  
Field Test ◽  
Lessons Learned ◽  
Small Scale ◽  
Geologic Storage ◽  
Scale Field ◽  
Co2 Eor

scholarly journals A Field Efficacy Evaluation of In2Care Mosquito Traps in Comparison with Routine Integrated Vector Management at Reducing Aedes aegypti

2021 ◽  
Vol 37 (4) ◽  
pp. 242-249
Author(s):  
Eva A. Buckner ◽  
Katie F. Williams ◽  
Samantha Ramirez ◽  
Constance Darrisaw ◽  
Juliana M. Carrillo ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Large Scale ◽  
Pathogen Transmission ◽  
Small Scale ◽  
Integrated Vector Management ◽  
Control Programs ◽  
Vector Management ◽  
Scale Field ◽  
Large Scale Field ◽  
Eggs And Larvae

ABSTRACT Aedes aegypti is the predominant vector of dengue, chikungunya, and Zika viruses. This mosquito is difficult to control with conventional methods due to its container-inhabiting behavior and resistance to insecticides. Autodissemination of pyriproxyfen (PPF), a potent larvicide, has shown promise as an additional tool to control Aedes species in small-scale field trials. However, few large-scale field evaluations have been conducted. We undertook a 6-month-long large-scale field study to compare the effectiveness and operational feasibility of using In2Care Mosquito Traps (In2Care Traps, commercially available Aedes traps with PPF and Beauveria bassiana) compared to an integrated vector management (IVM) strategy consisting of source reduction, larviciding, and adulticiding for controlling Ae. aegypti eggs, larvae, and adults. We found that while the difference between treatments was only statistically significant for eggs and larvae (P < 0.05 for eggs and larvae and P > 0.05 for adults), the use of In2Care Traps alone resulted in 60%, 57%, and 57% fewer eggs, larvae, and adults, respectively, collected from that site compared to the IVM site. However, In2Care Trap deployment and maintenance were more time consuming and labor intensive than the IVM strategy. Thus, using In2Care Traps alone as a control method for large areas (e.g., >20 ha) may be less practical for control programs with the capacity to conduct ground and aerial larviciding and adulticiding. Based on our study results, we conclude that In2Care Traps are effective at suppressing Ae. aegypti and have the most potential for use in areas without sophisticated control programs and within IVM programs to target hotspots with high population levels and/or risk of Aedes-borne pathogen transmission.

scholarly journals Pengembangan Komik Matematika Berbasis Kontekstual Untuk Materi Lingkaran

2021 ◽  
Vol 3 (2) ◽  
pp. 55
Author(s):  
Elfrida Rif’atul Chusniah ◽  
Rini Setianingsih
Keyword(s):  
Research And Development ◽  
Teaching And Learning ◽  
Field Trials ◽  
Student Response ◽  
Quality Of Education ◽  
Small Scale ◽  
Maximum Score ◽  
Is Research ◽  
Scale Field

Penelitian ini adalah penelitian yang bertujuan untuk mengembangkan komik matematika berbasis kontekstual untuk materi lingkaran yang berkualitas baik berdasarkan tiga kriteria, yaitu valid, praktis, dan efektif. Rancangan penelitian ini adalah Research and Development (R&D). Prosedur-prosedur pengembangan yang digunakan meliputi empat langkah: (1) melakukan perencanaan produk yang akandikembangkan, (2) mengembangkan produk awal, (3) validasi dan revisi produk, (4) uji coba lapangan skala kecil dan revisi. Uji coba komik dilakukan secara terbatas oleh 10 siswa kelas VIII SMP. Teknik pengumpulan data yang diterapkan dalam penelitian ini adalah angket, sedangkan instrumen penelitian yangdigunakan meliputi lembar validasi, angket penggunaan media, dan angket respon siswa. Data penelitian dianalisis dengan deskriptif kualitatif. Hasil penelitian ini menunjukkan bahwa komik matematika dinyatakan valid dengan skor kevalidan 4 oleh ahli media dan 3,9 oleh ahli materi dari skor maksimum 5 sehingga dikategorikan valid, komik matematika dinyatakan praktis dengan hasil analisis persentase kepraktisan 76,28 % dan komik matematika dinyatakan efektif degan hasil analisis persentase keefektifan 79,4%, sehingga dikategorikan efektif. Berdasarkan hasil tersebut maka media komik ini memiliki kualitas yang baik sehingga dapat dimanfaatkan sebagai satu upaya atau alternatif media dalam proses pembelajaran sebagai upaya peningkatan kualitas pendidikan dan menciptakan suasana yang menyenangkan bagi siswa.Kata Kunci: media pembelajaran, komik matematika, lingkaranThis research is a research that aims to develop contextual based mathematical comics for good quality circle material based on three criteria, namely valid, practical, and effective. The design of this research is Research and Development (R&D). The development procedures used include four steps: (1) conducting product planning to be developed, (2) developing initial products, (3) product validation and revision, (4) small-scale field trials and revisions. Comic trials are limited to 10 students in grade VIII SMP. Data collection techniques applied in this study were questionnaires, while the research instruments used included validation sheets, media use questionnaires, and student response questionnaires. The research data were analyzed by descriptive qualitative. The results of this study indicate that mathematics comics are declared valid with a validity score of 4 by media experts and 3.9 by material experts from a maximum score of 5 so that they are categorized valid, mathematical comics are declared practical with the results of a practicality percentage analysis of 76.28% and mathematical comics are declared effective with the result of the analysis of the effectiveness percentage is 79.4%, so it is categorized as effective. Based on these results, this comic media has good quality so that it can be used as an alternative media used by teachers in the teaching and learning process in an effort to improve the quality of education and create a pleasant atmosphere for students.Keywords: learning media, mathematical comics, circles

scholarly journals PENGARUH LATIHAN SMALL SIDED GAME TERHADAP AKURASI PASSING PADA SISWA EKSTRAKULIKULER FUTSAL SMP NEGERI 1 MUARO JAMBI

2019 ◽  
Vol 1 (2) ◽  
pp. 81-88
Author(s):  
Ahmad Muzaffar ◽  
Adhe Saputra
Keyword(s):  
High School ◽  
Data Analysis ◽  
Statistical Analysis ◽  
Junior High School ◽  
T Test ◽  
Small Scale ◽  
Training Method ◽  
Scale Field ◽  
Post Test ◽  
Soccer Training

Small sided-games training is a small-scale field, an appropriate situation developed for young players, so they can learn and develop. Small sided games training is also one of the methods of soccer training using smaller fields with fewer players. This training method  is a fairly effective exercise in physical improvement, techniques and tactics Passing is to feed the ball or pass the ball to a friend, while passing determination is the ability to set goals / pass the ball according to the goal or target. This research is an experimental research conducted with the aim to find out whether or not there is a result of something done on the sample to be studied. The research began with a pretest and ended with a posttest. The number of samples in this study amounted to 20 people. The training given was done during 16 meetings. This research was tested using a statistical analysis of the hipotsis test (t test). Based on data analysis, it can be concluded that the small sided games exercise gives a significant effect on the accuracy of passing on extracurricular students at SMP Negeri  1 Muaro Jambi, proven in the pre-test and post-test assessments with an average pre-test = 505 and post-test = 7.65, with the increment difference of 7.65. This can be seen by the T test that is Tcount = 3.492787 ˃ Ttable = 1.72913. Based on the results of research and  calculations from the data and discussions that have been carried out, this research proves that there is an influence of small sided games training on the passing accuracy of extracurricular students at Muaro Jambi State Junior High School. Small sided-games training is a small-scale field, an appropriate situation developed for young players, so they can learn and develop. Small sided games training is also one of the methods of soccer training using smaller fields with fewer players. This training method  is a fairly effective exercise in physical improvement, techniques and tactics Passing is to feed the ball or pass the ball to a friend, while passing determination is the ability to set goals / pass the ball according to the goal or target. This research is an experimental research conducted with the aim to find out whether or not there is a result of something done on the sample to be studied. The research began with a pretest and ended with a posttest. The number of samples in this study amounted to 20 people. The training given was done during 16 meetings. This research was tested using a statistical analysis of the hipotsis test (t test). Based on data analysis, it can be concluded that the small sided games exercise gives a significant effect on the accuracy of passing on extracurricular students at SMP Negeri  1 Muaro Jambi, proven in the pre-test and post-test assessments with an average pre-test = 505 and post-test = 7.65, with the increment difference of 7.65. This can be seen by the T test that is Tcount = 3.492787 ˃ Ttable = 1.72913. Based on the results of research and  calculations from the data and discussions that have been carried out, this research proves that there is an influence of small sided games training on the passing accuracy of extracurricular students at Muaro Jambi State Junior High School.

Monitoring the plasmapause dynamics at LEO

2021 ◽  
Author(s):  
Balázs Heilig ◽  
Claudia Stolle ◽  
Jan Rauberg ◽  
Guram Kervalishvili
Keyword(s):  
Small Scale ◽  
Topside Ionosphere ◽  
Dynamic Coupling ◽  
Ion Drift ◽  
The Past ◽  
Scale Field ◽  
Funded Project ◽  
Mutual Relations ◽  
Langmuir Probe Measurements ◽  
Probe Measurements

<p>In the past decades researchers have revealed links between a series of sub-auroral ionospheric phenomena and the plasmapause (PP) dynamics, such as the mid-latitude ionospheric trough (MIT) and the associated sub-auroral temperature enhancement (SETE), the light-ion trough (LIT), the sub-auroral ion drift (SAID) or the more intense sub-auroral polarisation stream (SAPS), and most recently, the inner boundary of small-scale field-aligned currents (SSFACs). Most of these phenomena can be directly observed by the Swarm constellation of ESA at LEO. Thus, Swarm presents a unique opportunity to study the relations between them and also their relation to the PP dynamics.</p><p>In a recent Swarm DISC project, PRISM (Plasmapause Related boundaries in the topside Ionosphere as derived from Swarm Measurements), three new products have been developed. Two products characterise the MIT (and the associated SETE). The MITx_LP utilises the Langmuir probe measurements of electron density and temperature, while the MITxTEC product derives the MIT properties from GPS TEC observations. The third product, PPIxFAC provides information on the location and the main characteristics of the equatorial boundary of SSFACs, and it also includes a proxy for the location of the PP at MLT midnight.</p><p>In this presentation we introduce the above Swarm L2 products, present the results of a comparative study aiming at revealing their mutual relations and also their dynamic coupling to the PP. Then we demonstrate how the observations of all these ionospheric phenomena combined can be used to develop an improved proxy for monitoring the PP dynamics at LEO as one of the goals of our new ESA-funded project PLASMA.</p>

scholarly journals Viscosity and Large-Scale Magnetic Fields from Accretion Disc Dynamos

1997 ◽  
Vol 163 ◽  
pp. 190-200
Author(s):  
Christopher A. Tout
Keyword(s):  
Magnetic Fields ◽  
Large Scale ◽  
Small Scale ◽  
Cascade Process ◽  
Jet Formation ◽  
Magnetohydrodynamic Turbulence ◽  
Discs Large ◽  
Scale Field ◽  
Large Scale Field ◽  
Nova Outbursts

AbstractWe review those processes associated with accretion discs that are probably influenced by magnetic fields, specifically, accretiondisc viscosity, energy dissipation and jet formation. We consider how magnetic instabilities in the disc can lead to a self-sustaining dynamical dynamo and how this is manifested as magnetohydrodynamic turbulence in numerical simulations. We show that currently these models do not fit with observational constraints imposed by dwarf-nova outbursts. We also show that the drop in ionisation fraction does not lead to the apparently necessary drop in viscosity in quiescent cataclysmic variable discs. Large-scale magnetic fields are required to launch and collimate jets form discs. We describe an inverse cascade process that can construct sufficient large-scale field from small-scale field generated by a dynamo.

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