scholarly journals FEATURES OF GRAIN MOISTUREAUTOMATED MEASUREMENTIN FIELD CONDITIONS

2021 ◽  
pp. 60-63
Author(s):  
P. I. Kalandarov ◽  
A. M. Makarov ◽  
G. M. Aralov
Keyword(s):  
High Frequency ◽  
High Accuracy ◽  
Field Conditions ◽  
Grain Moisture ◽  
Frequency Module ◽  
Moisture State ◽  
Grain Properties ◽  
Selection Of

The article discusses ways to Mature grain properties and describes its behavior during harvesting, to optimize the selection of grain moisture state, and also analyzes the requirements for the selection of methods and design of a high-frequency module, which provides for the use of instrumentation for monitoring grain moisture, as well as their high accuracy and the possibility of conducting measurements in the field.

scholarly journals An Improved Time Integration Method Based on Galerkin Weak Form with Controllable Numerical Dissipation

2021 ◽  
Vol 11 (4) ◽  
pp. 1932
Author(s):  
Weixuan Wang ◽  
Qinyan Xing ◽  
Qinghao Yang
Keyword(s):  
High Frequency ◽  
Integration Method ◽  
Time Integration ◽  
Low Frequency ◽  
Weak Form ◽  
High Accuracy ◽  
Numerical Dissipation ◽  
Frequency Range ◽  
Time Integration Method ◽  
Numerical Damping

Based on the newly proposed generalized Galerkin weak form (GGW) method, a two-step time integration method with controllable numerical dissipation is presented. In the first sub-step, the GGW method is used, and in the second sub-step, a new parameter is introduced by using the idea of a trapezoidal integral. According to the numerical analysis, it can be concluded that this method is unconditionally stable and its numerical damping is controllable with the change in introduced parameters. Compared with the GGW method, this two-step scheme avoids the fast numerical dissipation in a low-frequency range. To highlight the performance of the proposed method, some numerical problems are presented and illustrated which show that this method possesses superior accuracy, stability and efficiency compared with conventional trapezoidal rule, the Wilson method, and the Bathe method. High accuracy in a low-frequency range and controllable numerical dissipation in a high-frequency range are both the merits of the method.

An Efficient Galerkin BEM to Compute High Acoustic Eigenfrequencies

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Mario Durán ◽  
Jean-Claude Nédélec ◽  
Sebastián Ossandón
Keyword(s):  
Numerical Method ◽  
Integral Equations ◽  
High Frequency ◽  
High Accuracy ◽  
Integral Representations ◽  
Stability And Convergence ◽  
Symmetric Matrices ◽  
Frequency Interval ◽  
Numerical Treatment ◽  
The Stability

An efficient numerical method, using integral equations, is developed to calculate precisely the acoustic eigenfrequencies and their associated eigenvectors, located in a given high frequency interval. It is currently known that the real symmetric matrices are well adapted to numerical treatment. However, we show that this is not the case when using integral representations to determine with high accuracy the spectrum of elliptic, and other related operators. Functions are evaluated only in the boundary of the domain, so very fine discretizations may be chosen to obtain high eigenfrequencies. We discuss the stability and convergence of the proposed method. Finally we show some examples.

scholarly journals Assessment of the Accuracy of a Multi-Beam LED Scanner Sensor for Measuring Olive Canopies

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4406 ◽  
Author(s):  
Rafael Sola-Guirado ◽  
Sergio Bayano-Tejero ◽  
Antonio Rodríguez-Lizana ◽  
Jesús Gil-Ribes ◽  
Antonio Miranda-Fuentes
Keyword(s):  
Laboratory Test ◽  
Real Time ◽  
Relative Error ◽  
Laser Scanner ◽  
Field Tests ◽  
High Accuracy ◽  
Field Conditions ◽  
Canopy Trees ◽  
Canopy Volume

Canopy characterization has become important when trying to optimize any kind of agricultural operation in high-growing crops, such as olive. Many sensors and techniques have reported satisfactory results in these approaches and in this work a 2D laser scanner was explored for measuring canopy trees in real-time conditions. The sensor was tested in both laboratory and field conditions to check its accuracy, its cone width, and its ability to characterize olive canopies in situ. The sensor was mounted on a mast and tested in laboratory conditions to check: (i) its accuracy at different measurement distances; (ii) its measurement cone width with different reflectivity targets; and (iii) the influence of the target’s density on its accuracy. The field tests involved both isolated and hedgerow orchards, in which the measurements were taken manually and with the sensor. The canopy volume was estimated with a methodology consisting of revolving or extruding the canopy contour. The sensor showed high accuracy in the laboratory test, except for the measurements performed at 1.0 m distance, with 60 mm error (6%). Otherwise, error remained below 20 mm (1% relative error). The cone width depended on the target reflectivity. The accuracy decreased with the target density.

scholarly journals صناعة المجتهد بين التراث والمعاصرة (Producing Mujtahid between Tradition and Contemporary)

2019 ◽  
Vol 16 (2) ◽  
pp. 111-136
Author(s):  
ميثاء سعيد عبداالله الخاطري ◽  
سيد إسكندر شاه ◽  
حسام الدين الصيفي
Keyword(s):  
Religious Tradition ◽  
High Accuracy ◽  
Learning System ◽  
Islamic Tradition ◽  
Qualified Person ◽  
Temporal And Spatial ◽  
Selection Of

من روائع هذا الموروث الديني عن النبي ﷺ، قدرته على مسايرة الحوادث والمستجدات، واستيعاب التنوع والاختلاف الزماني والمكاني والأحوال، بحيث لا يند عن النص أو فهمه شيء. الاجتهاد من فروض الكفاية التي لا يجوز أن يخلو منه عصر، ومن تنادى بإغلاق باب الاجتهاد فقد أخطأ، باب الاجتهاد لا يوصد لأن مسائل العصر متجددة، والنوازل كثيرة، وخاصة في هذا الزمان المتسارع، وإن قل الاجتهاد الفردي إلا أن الاجتهاد الجماعي له دور كبير في إيجاد الحلول التي تحتاجها الأمة. هذا البحث يهتم بصناعة المجتهد، والعناية بإخراج مجتهدين مؤهلين للعملية الاجتهادية، أو الفتيا، وفق شروط المجتهد التأهيلية. خلص البحث إلى النتائج الآتية: الاهتمام بالشخصية المختارة للصناعة البحثية، وإعداد الاختبارات والمقابلات المنتقاة بدقة عالية لاجتيازها، وتخطي العقبات والتحديات والعناية بالمنظومة التعلمية المهمة في صناعة المجتهد، والاهتمام بالتراث الإسلامي في الاستفادة منه والبناء عليه، واستصحابه بالقدر الذي يكون معينا للوصول للمطلوب. الكلمات المفتاحيّة: الاجتهاد، المجتهد، التراث، الموروث الإسلامي. Abstract Among the masterpieces of religious tradition of Prophet S.A.W. is the ability to cope with the events and developments and to absorb the diversity of temporal and spatial conditions, in line with the Islamic verses. Ijtihad is the duties of sufficiency that ones have to bear them. Therefore, whoever intends to close the door of Ijtihad has erred, since the issues of mankind changeable from day to day. Although there are small number of Ijtihad individually but there are Ijtihad collectively that played big role in finding solutions which arise among people. This study discussed the issues of producing Mujtahid, in terms of qualification and youthness, according to the stipulated conditions. The study found that it is important to have selection of qualified person to become mujtahid as well as the selected tests and interviews with high accuracy, so that they could overcome the obstacles and challenges later. The study also found that there should have a concern on the important learning system in producing mujtahid and the Islamic heritage as well. Keywords: Ijtihad, Mujtahid, Tradition, Islamic Tradition.

scholarly journals Genetic effect in leaf and xylem transcriptome variations among Eucalyptus urophylla x grandis hybrids in field conditions

2018 ◽  
Vol 67 (1) ◽  
pp. 57-65
Author(s):  
Alexandre Vaillant ◽  
Astrid Honvault ◽  
Stéphanie Bocs ◽  
Maryline Summo ◽  
Garel Makouanzi ◽  
...  
Keyword(s):  
Gene Expression ◽  
Variance Components ◽  
Genetic Effect ◽  
Field Conditions ◽  
Eucalyptus Urophylla ◽  
Rna Seq ◽  
Intermediate Phenotypes ◽  
False Discovery ◽  
Hybrid Clones ◽  
Selection Of

Abstract To assess the genetic and environmental components of gene-expression variation among trees we used RNA-seq technology and Eucalyptus urophylla x grandis hybrid clones tested in field conditions. Leaf and xylem transcriptomes of three 20 month old clones differing in terms of growth, repeated in two blocks, were investigated. Transcriptomes were very similar between ramets. The number of expressed genes was significantly (P<0.05) higher in leaf (25,665±634) than in xylem (23,637±1,241). A pairwise clone comparisons approach showed that 4.5 to 14 % of the genes were diffe­rentially expressed (false discovery rate [FDR]<0.05) in leaf and 7.1 to 16 % in xylem. An assessment of among clone variance components revealed significant results in leaf and xylem in 3431 (248) genes (at FDR<0.2) and 160 (3) (at FDR<0.05), respectively. These two complementary approa­ches displayed correlated results. A focus on the phenylpro­panoid, cellulose and xylan pathways revealed a large majo­rity of low expressed genes and a few highly expressed ones, with RPKM values ranging from nearly 0 to 600 in leaf and 10,000 in xylem. Out of the 115 genes of these pathways, 45 showed differential expression for at least one pair of geno­type, five of which displaying also clone variance compo­nents. These preliminary results are promising in evaluating whether gene expression can serve as possible ‘intermediate phenotypes’ that could improve the accuracy of selection of grossly observable traits.

scholarly journals Interannual modulation of extratropical high frequency variability

1997 ◽  
Vol 40 (4) ◽  
Author(s):  
R. Caballero
Keyword(s):  
Normal Mode ◽  
Time Scales ◽  
High Frequency ◽  
Spherical Geometry ◽  
Simple Explanation ◽  
Space And Time ◽  
High Frequency Variability ◽  
Hemisphere Winter ◽  
Selection Of

A simple explanation is presented for the observed interannual changes in the dominant space and time scales of Northem Hemisphere winter extratropical high frequency variability. It is found that such changes can suc- cessfully be predicted by linearizing a 2-level quasi-geostrophic mode] in spherical geometry around the ob- served zona] mean states. The mechanisms responsible for the selection of the most unstable normal mode are investigated.

Observations of Meteors using an over-the-horizon Radar

1989 ◽  
Vol 8 (1) ◽  
pp. 88-93 ◽  
Author(s):  
R. M. Thomas ◽  
D. J. Netherway
Keyword(s):  
Signal Processing ◽  
High Frequency ◽  
Meteor Shower ◽  
Upper Atmosphere ◽  
High Frequency Band ◽  
Meteor Detection ◽  
Signal Environment ◽  
Frequency Management ◽  
Sporadic Meteors ◽  
Selection Of

AbstractWhen metre wavelength radars were first operated in the 1940s, echoes were obtained which could be attributed to backscatter from ionised trains produced by the ablation of meteroids in the upper atmosphere at altitudes near 100 km. Modern over-the-horizon skywave radars operating in the HF (High Frequency) band employ digital techniques for both radar control and signal processing and are aided by frequency management subsystems for the selection of appropriate frequencies for meteor detection based on real-time monitoring of the HF signal environment.This paper describes the results of using such a radar for meteor observations. We report the detection of the Eta Aquarid meteor shower and demonstrate that a large increase in the echo rate due to sporadic meteors is obtained as frequencies are reduced below 15 MHz and the underdense echo ceiling rises in altitude. Finally, we present preliminary observations of highly Doppler shifted echoes which travel at meteoric velocities and which we identify as meteor ‘head echoes’.

scholarly journals Variability and Performance of Short to Long-Range Single Baseline RTK GNSS Positioning in Indonesia

2019 ◽  
Vol 94 ◽  
pp. 01012 ◽  
Author(s):  
Irwan Gumilar ◽  
Brian Bramanto ◽  
Fuad F. Rahman ◽  
I Made D. A. Hermawan
Keyword(s):  
Long Range ◽  
High Frequency ◽  
Carrier Phase ◽  
Satellite System ◽  
High Accuracy ◽  
Gnss Positioning ◽  
And Performance ◽  
Gnss Network ◽  
Single Baseline ◽  
Global Navigation Satellite

As the modernized Global Navigation Satellite System (GNSS) method, Real Time Kinematic (RTK) ensures high accuracy of position (within several centimeters). This method uses Ultra High Frequency (UHF) radio to transmit the correction data, however, due to gain and power issues, Networked Transport of RTCM via Internet Protocol (RTCM) is used to transmit the correction data for a longer baseline. This Research aims to investigate the performance of short to long-range single baseline RTK GNSS (Up to 80 KM) by applying modified LAMBDA method to resolve the ambiguity in carrier phase. The RTK solution then compared with the differential GNSS network solution. The results indicate that the differences are within RTK accuracy up to 80 km are several centimeter for horizontal solution and three times higher for vertical solution.

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