IDENTIFICATION OF THE INITIAL FIELD OF THE TRANSPORT MODEL AND CONSTRUCTION OF THE OPTIMAL SCHEME OF MEASUREMENTS

2018 ◽  
Author(s):  
V.S. Kochergin ◽  
S.V. Kochergin ◽  
◽  
Keyword(s):  
Transport Model ◽  
Initial Field ◽  
Optimal Scheme

Transfer optics for high spatial resolution electron spectroscopy

1988 ◽  
Vol 46 ◽  
pp. 666-667
Author(s):  
G. G. Hembree ◽  
Luo Chuan Hong ◽  
P.A. Bennett ◽  
J.A. Venables
Keyword(s):  
Magnetic Field ◽  
Scanning Transmission Electron Microscope ◽  
Low Energy ◽  
Objective Lens ◽  
State University ◽  
Arizona State University ◽  
Initial Field ◽  
Resolution Electron ◽  
Scanning Transmission ◽  
Low Energy Electrons

A new field emission scanning transmission electron microscope has been constructed for the NSF HREM facility at Arizona State University. The microscope is to be used for studies of surfaces, and incorporates several surface-related features, including provision for analysis of secondary and Auger electrons; these electrons are collected through the objective lens from either side of the sample, using the parallelizing action of the magnetic field. This collimates all the low energy electrons, which spiral in the high magnetic field. Given an initial field Bi∼1T, and a final (parallelizing) field Bf∼0.01T, all electrons emerge into a cone of semi-angle θf≤6°. The main practical problem in the way of using this well collimated beam of low energy (0-2keV) electrons is that it is travelling along the path of the (100keV) probing electron beam. To collect and analyze them, they must be deflected off the beam path with minimal effect on the probe position.

PENGEMBANGAN PEMBELAJARAN TARI LENGGOK MAK INANG MELALUI MULTIMEDIA INTERAKTIF BERBASIS E-LEARNING

2019 ◽  
Vol 8 (1) ◽  
pp. 49
Author(s):  
Ronni Lirahman ◽  
Yusnizar Heniwaty Heniwaty
Keyword(s):  
Field Trial ◽  
Interactive Multimedia ◽  
Multimedia Learning ◽  
Learning Material ◽  
Main Field ◽  
Initial Field ◽  
E Learning ◽  
Definition Of

ABSTRACT This research produced a product of the development of Lenggok Mak Inang dance learning through interactive multimedia which included appreciation learning material (Basic Competence 3) and expression (Basic Competence 4) in class X of SMK / SMA. The appreciation material contains the definition of dance, accompaniment music, clothing, patterns, while the expression material contains terms, variety and arrangement of motion in the Lenggok Mak Inang dance. From the test media experts got a score of 4,42 (Very Good), media experts got a score of 4 (Good), user trials which included an initial field trial of 4,08 (Good), main field trial 4,22 ( Very Good) and an operational field trial of 4,53 (Very Good). The results obtained indicate that the development of interactive multimedia learning Lenggok Mak Inang dance is very feasible to use or be used as a learning media for dance.                                                                                    Keywords: Interactive Multimedia, E-Learning, Lenggok Mak Inang Dance.  ABSTRAKPenelitian ini menghasilkan produk pengembangan pembelajaran tari Lenggok Mak Inang melalui multimedia interaktif yang didalamnya terdapat materi pembelajaran apresiasi (Kompetensi Dasar 3) dan ekspresi (Kompetensi Dasar 4) kelas X SMK/SMA. Materi apresiasi berisikan definisi tari, musik pengiring, busana, pola/ garis, sedangkan materi ekspresi berisikan istilah, ragam dan susunan gerak pada tari Lenggok Mak Inang. Dari uji ahli media mendapatkan skor 4,42 (Sangat Baik), ahli media mendapatkan skor 4 (Baik), uji coba pengguna yang meliputi uji coba lapangan awal 4,08 (Baik), uji coba lapangan utama 4,22 (Sangat Baik) dan uji coba lapangan operasional 4,53 (Sangat Baik). Hasil yang diperoleh menunjukkan bahwa pengembangan multimedia interaktif pembelajaran tari Lenggok Mak Inang ini Sangat Layak digunakan atau dijadikan media pembelajaran tari. Kata kunci: Multimedia Interaktif, E-Learning, Tari Lenggok Mak Inang.

A detailed contaminant transport model for facility hazard assessment in urban areas

1999 ◽  
Author(s):  
Bohdan Cybyk ◽  
Jay Boris ◽  
Theodore Young, Jr. ◽  
Charles Lind ◽  
Alexandra Landsberg
Keyword(s):  
Contaminant Transport ◽  
Hazard Assessment ◽  
Urban Areas ◽  
Transport Model

The Carbon:²³⁴Thorium ratios of sinking particles in the California Current Ecosystem 2: Examination of a thorium sorption, desorption, and particle transport model

2019 ◽  
Author(s):  
Michael Stukel ◽  
Thomas Kelly
Keyword(s):  
Organic Carbon ◽  
Water Column ◽  
Particulate Organic Carbon ◽  
Transport Model ◽  
California Current ◽  
In Situ Measurements ◽  
Power Law Distribution ◽  
Sinking Particles ◽  
Organic Carbon Concentration

Thorium-234 (234Th) is a powerful tracer of particle dynamics and the biological pump in the surface ocean; however, variability in carbon:thorium ratios of sinking particles adds substantial uncertainty to estimates of organic carbon export. We coupled a mechanistic thorium sorption and desorption model to a one-dimensional particle sinking model that uses realistic particle settling velocity spectra. The model generates estimates of 238U-234Th disequilibrium, particulate organic carbon concentration, and the C:234Th ratio of sinking particles, which are then compared to in situ measurements from quasi-Lagrangian studies conducted on six cruises in the California Current Ecosystem. Broad patterns observed in in situ measurements, including decreasing C:234Th ratios with depth and a strong correlation between sinking C:234Th and the ratio of vertically-integrated particulate organic carbon (POC) to vertically-integrated total water column 234Th, were accurately recovered by models assuming either a power law distribution of sinking speeds or a double log normal distribution of sinking speeds. Simulations suggested that the observed decrease in C:234Th with depth may be driven by preferential remineralization of carbon by particle-attached microbes. However, an alternate model structure featuring complete consumption and/or disaggregation of particles by mesozooplankton (e.g. no preferential remineralization of carbon) was also able to simulate decreasing C:234Th with depth (although the decrease was weaker), driven by 234Th adsorption onto slowly sinking particles. Model results also suggest that during bloom decays C:234Th ratios of sinking particles should be higher than expected (based on contemporaneous water column POC), because high settling velocities minimize carbon remineralization during sinking.

PENGEMBANGAN BAHAN AJAR BERBASIS PENDEKATAN OPEN ENDED PADA MATERI FPB/KPK KELAS IV UNTUK MENINGKATKAN KEMAMPUAN PENALARAN SISWA DI SD NEGERI TAMBAKREJO 01 SEMARANG

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Ambar Widianingrum ◽  
Joko Sulianto ◽  
Rahmat Rais
Keyword(s):  
Data Analysis ◽  
Research And Development ◽  
Teaching And Learning ◽  
Analysis Data ◽  
Field Trials ◽  
Teaching Materials ◽  
Initial Field ◽  
Analysis Technique ◽  
Quantitative Descriptive ◽  
Stage 1

The purpose of this study was to describe the feasibility of teaching materials based on an open-ended approach to improve the reasoning abilities of fourth grade students in elementary schools. This type of research is research and development (Research and Development). The subjects of this study were 3 classroom teachers. The data analysis technique used is descriptive qualitative data analysis (data reduction, data presentation and conclusion) and quantitative descriptive data analysis. Based on the results of stage 1 media validation, it was obtained 84.8%, and the results of stage 2 media validation were obtained 94.8%. The result of material validation for stage 1 was obtained 84.6%, and validation for material for stage 2 was obtained 93.3%. The results of initial field trials obtained media 93.7% and material 92.3%. This shows that the teaching material is declared valid and suitable for use. Based on the results of this study, the suggestion that can be conveyed is that teaching materials based on an open-ended approach can be used as a tool for teaching and learning resources for students.

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