Corrugated waveguide under scaling investigation

Some scaling properties for classical light ray dynamics inside a periodically corrugated waveguide are studied by use of a simplified two-dimensional nonlinear area-preserving map. It is shown that the phase space is mixed. The chaotic sea is characterized using scaling arguments revealing critical exponents connected by an analytic relationship. The formalism is widely applicable to systems with mixed phase space, and especially in studies of the transition from integrability to non-integrability, including that in classical billiard problems.Comment: A complete list of my papers can be found in: http://www.rc.unesp.br/igce/demac/denis

Dynamical properties of a dissipative discontinuous map: A scaling investigation

The effects of dissipation on the scaling properties of nonlinear discontinuous maps are investigated by analyzing the behavior of the average squared action \left as a function of the $n$-th iteration of the map as well as the parameters $K$ and $\gamma$, controlling nonlinearity and dissipation, respectively. We concentrate our efforts to study the case where the nonlinearity is large; i.e., $K\gg 1$. In this regime and for large initial action $I_0\gg K$, we prove that dissipation produces an exponential decay for the average action \left. Also, for $I_0\cong 0$, we describe the behavior of \left using a scaling function and analytically obtain critical exponents which are used to overlap different curves of \left onto an universal plot. We complete our study with the analysis of the scaling properties of the deviation around the average action $\omega$.Comment: 20 pages, 7 figure

Fertilizer Consumption in Rwanda: Past Trends, Future Potential, and Determinants

Paper prepared for the Policy Workshop on Fertilizer Use and Marketing, organized by MINAGRI and USAID, Rwanda, 22-23 February 20001.food security, food policy, Rwanda, fertilizer consumption, Crop Production/Industries, Q18,

“Life in Balance” Tergenapi di SLA Mebali Kabupaten Tana Toraja Bersama VoS

Paper ini tentang kegiatan Pengabdian kepada Masyarakat yang dilakukan oleh penulis sebagai dosen pembimbing dari kelompok mahasiswa yang bernama Choir VoS. VoS singkatan dari Voice of Computer Science, adalah sebuah wadah yang dibuat oleh fakultas ilmu komputer untuk menampung dan membina mahasiswa yang memiliki talenta bernyanyi. Di sela-sela tugas belajar sebagai mahasiswa setiap anggota VoS harus memiliki komitment yang kuat dalam kelompok VoS. Komitmen itu seperti latihan, pelayanan dan berkegiatan sosial baik di dalam mupun di luar kampus. Penulis dan VoS mengadakan Pengabdian kepada Masyarakat di sebuah Sekolah Lanjutan Advent (SMP dan SMA) boarding school di Mebali kabupaten Tana Toraja Sulawesi Selatan. Kegiatan ini berlangsung selama 10 hari dengan agenda seminar tentang teknologi, pelatihan komputer dasar, diskusi kelompok, beribadah, dan pentas paduan suara. Kegiatan ini mengambil tema Live in Balance, senada dengan tujuan yang diharapkan yaitu menyeimbangkan kehidupan antara bekerja, belajar, beribadah dan bersosial. Hasil yang terlihat dalam PkM ini diantaranya peserta didik memahami peran siswa dalam menghadapi RI 4.0, peserta didik melek internet, juga guru dan siswa terisi kerohaniannya karena ada diskusi dan pentas lagu-lagu rohani. Jumlah peserta didik dan guru yang ikut berpartisapasi sekitar 200 orang

Diurnal surface flux variability over western boundary currents

© The Author(s), 2019. This article is distributed under the terms of the Creative Commons Attribution-NonCommercial‐NoDerivs License. The definitive version was published in Clayson, C. A., & Edson, J. B. Diurnal surface flux variability over western boundary currents. Geophysical Research Letters, 46(15), (2019): 9174-9182, doi:10.1029/2019GL082826.An analysis of a satellite ocean surface turbulent flux product demonstrated that, as expected, the western boundary current regions dominate the seasonal cycle amplitude. Surprisingly, our analysis of the global ocean diurnal flux variability also demonstrated a regional maximum in the winter over the western boundary current regions. We conducted comparisons with in situ data from several buoys located in these regions. The buoy data were in general agreement with the relative magnitude, timing, and importance of each of the bulk parameters driving the latent and sensible heat fluxes. Further analysis demonstrated that the strength and timing of the diurnal signal is related to the location of the buoy relative to the region of maximum heat flux and sea surface temperature gradient. In both regions, the timing of the higher winds coincides with the moistest surface layer, indicating that surface fluxes rather than entrainment mixing play a key role in this phenomenon.CAC gratefully acknowledges funding from the NASA MAP and NEWS programs (NNX13AN48G and NNX15AI47A). CLIMODE data were funded by the U.S. National Science Foundation (http://uop.whoi.edu/projects/CLIMODE/climodedata.html). KEO data are provided by the OCS Project Office of NOAA/PMEL (https://www.pmel.noaa.gov/ocs/data/disdel/). JKEO data are provided by RIGC/JAMSTEC and PMEL/NOAA (http://www.jamstec.go.jp/iorgc/ocorp/ktsfg/data/jkeo/). SeaFlux data are provided by the U.S. NOAA Climate Data Record Program (https://www.ncdc.noaa.gov/cdr)

Systematic evaluation of software product line architectures

The architecture of a software product line is one of its most important artifacts as it represents an abstraction of the products that can be generated. It is crucial to evaluate the quality attributes of a product line architecture in order to: increase the productivity of the product line process and the quality of the products; provide a means to understand the potential behavior of the products and, consequently, decrease their time to market; and, improve the handling of the product line variability. The evaluation of product line architecture can serve as a basis to analyze the managerial and economical values of a product line for software managers and architects. Most of the current research on the evaluation of product line architecture does not take into account metrics directly obtained from UML models and their variabilities; the metrics used instead are difficult to be applied in general and to be used for quantitative analysis. This paper presents a Systematic Evaluation Method for UML-based Software Product Line Architecture, the SystEM-PLA. SystEM-PLA differs from current research as it provides stakeholders with a means to: (i) estimate and analyze potential products; (ii) use predefined basic UML-based metrics to compose quality attribute metrics; (iii) perform feasibility and trade-off analysis of a product line architecture with respect to its quality attributes; and, (iv) make the evaluation of product line architecture more flexible. An example using the SEI’s Arcade Game Maker (AGM) product line is presented as a proof of concept, illustrating SystEM-PLA activities. Metrics for complexity and extensibility quality attributes are defined and used to perform a trade-off analysis

Food Security Survey: Phase I, Agricultural Production and Land Use Season 2000A

REPUBLIC OF RWANDA, MINISTRY OF AGRICULTURE, ANIMAL RESOURCES, AND FORESTRY, Food Security Research Project (FSRP) and Division of Agricultural Statistics (DSA)food security, food policy, Rwanda, agricultural production, land use, Food Security and Poverty, Q18,

Controlled Whole-body Vibration Training Reduces Risk of Falls in People with Multiple Sclerosis

Despite the prevalence of falls among people with multiple sclerosis (MS), there are very limited evidence-based treatment approaches for fall prevention among this population. Controlled whole-body vibration (CWBV) training has recently emerged as a new modality to train older adults to reduce their risk of falls primarily because it is portable, safe, easy to use, and cost-effective; and requires less intensive physical activity than traditional exercise-based methods. Nevertheless, there is a lack of evidence about the impact of CWBV training on reducing falls in people with MS. The primary purpose of this study was to examine if an 8-week CWBV training protocol can reduce risk of falls in people with MS. Twenty-two individuals with MS (mean ± standard deviation age: 52.0 ± 13.7 y/o; body height: 166.0 ± 9.3 cm; body mass: 79.5 ± 24.4 kg; disease duration: 15.5 ± 11.1 y; Patient Determined Disability Step: 3.7 ± 1.9; 15 females) underwent the vibration training 3 times per week for 8 weeks while standing on a side alternating vibration platform with knees slightly bent. Each training session consisted of 5 repetitions of 1-min vibration exposure followed by a 1-min rest. The vibration frequency and amplitude were 20 Hz and 3.6 mm, respectively. Their risk of falls was quantified by the isometric knee extensor muscle strength capacity (normalized to the body mass), the EquiScale body balance scale, and the functional mobility measured by the Timed-Up-and-Go (TUG) test. All risk factors were evaluated prior to (pre-training) and after (post-training) the 8-week training. Paired t-tests were used to examine if the training improves these risk factors. Our results revealed that the knee extensor strength capacity on the weak side increased significantly form 0.88 ± 0.45 Nm/kg for the pre-training test to 1.02 ± 0.50 Nm/kg for the post-training test (p \u3c 0.001). Compared to pre-training values, there was a significant improvement at post-training for both body balance (11.1 ± 4.0 vs. 12.7 ± 3.2, p \u3c 0.001) and TUG (14.8 ± 6.6 vs. 13.0 ± 5.5 sec, p \u3c 0.01). The finding of this study suggested that an 8-week CWBV training program can be well accepted by people with MS. Our results supported that CWBV intervention could reduce the risk of falls among individuals with MS by strengthening their lower limb muscles, improving the body balance, and enhancing the functional mobility. The clinical application of CWBV may reduce falls for individuals with MS; however, more systematic studies based on large sample sizes are needed to investigate the longitudinal effects of vibration training to prevent real-life falls among persons living with MS