scholarly journals Real-Time Radar Reflectivity Calibration from Differential Phase Measurements

2014 ◽  
Vol 31 (5) ◽  
pp. 1089-1097 ◽  
Author(s):  
Aldo Bellon ◽  
Frédéric Fabry
Keyword(s):  
Real Time ◽  
Heavy Precipitation ◽  
Phase Measurements ◽  
Differential Phase ◽  
Ex Post ◽  
Ex Post Facto ◽  
Strong Convection ◽  
The Stability ◽  
Light Precipitation ◽  
Self Consistency

AbstractAn algorithm based on the self-consistency between the horizontal reflectivity ZH and the specific differential phase KDP has been devised for the calibration of the reflectivity measurements of the McGill S-band dual-polarization radar and implemented in real time in the fall of 2012. By combining pairs of measured and theoretical differential propagation phases (ΦDP) along rain paths from several azimuths, elevation angles, and radar cycles, a robust calibration estimate is obtained even in relatively light precipitation, provided the number of pairs is of the order of at least 103. It confirmed the stability of the radar system as further corroborated by disdrometer and ground echo comparisons. However, the two-parameter ZH–KDP technique proved to be inadequate in convective situations because it overestimates ΦDP differences of paths with heavy precipitation. An ex post facto analysis has revealed that a three-parameter (ZH–KDP–ZDR) relationship provides a much better agreement with the measured ΦDP differences regardless of the intensity of the precipitation along the rain paths. The main usefulness of the technique remains its ability to derive a reliable calibration correction factor even in light precipitation; thus, it is readily applicable in climate regimes and/or at times of the year characterized by the absence of strong convection capable of providing the large ΦDP differences previously thought necessary for such a technique to be successful.

scholarly journals A Prototype Quantitative Precipitation Estimation Algorithm for Operational S-Band Polarimetric Radar Utilizing Specific Attenuation and Specific Differential Phase. Part II: Performance Verification and Case Study Analysis

2019 ◽  
Vol 20 (5) ◽  
pp. 999-1014 ◽  
Author(s):  
Stephen B. Cocks ◽  
Lin Tang ◽  
Pengfei Zhang ◽  
Alexander Ryzhkov ◽  
Brian Kaney ◽  
...  
Keyword(s):  
Real Time ◽  
Heavy Precipitation ◽  
Estimation Algorithm ◽  
Differential Phase ◽  
Specific Attenuation ◽  
Quantitative Precipitation Estimation ◽  
Precipitation Estimation ◽  
Bias Ratio ◽  
Using Data ◽  
Precipitation Events

Abstract The quantitative precipitation estimate (QPE) algorithm developed and described in Part I was validated using data collected from 33 Weather Surveillance Radar 1988-Doppler (WSR-88D) radars on 37 calendar days east of the Rocky Mountains. A key physical parameter to the algorithm is the parameter alpha α, defined as the ratio of specific attenuation A to specific differential phase KDP. Examination of a significant sample of tropical and continental precipitation events indicated that α was sensitive to changes in drop size distribution and exhibited lower (higher) values when there were lower (higher) concentrations of larger (smaller) rain drops. As part of the performance assessment, the prototype algorithm generated QPEs utilizing a real-time estimated and a fixed α were created and evaluated. The results clearly indicated ~26% lower errors and a 26% better bias ratio with the QPE utilizing a real-time estimated α as opposed to using a fixed value as was done in previous studies. Comparisons between the QPE utilizing a real-time estimated α and the operational dual-polarization (dual-pol) QPE used on the WSR-88D radar network showed the former exhibited ~22% lower errors, 7% less bias, and 5% higher correlation coefficient when compared to quality controlled gauge totals. The new QPE also provided much better estimates for moderate to heavy precipitation events and performed better in regions of partial beam blockage than the operational dual-pol QPE.

scholarly journals Real-Time In Vitro Fluorescence Anisotropy of the Cyanobacterial Circadian Clock

2019 ◽  
Vol 2 (2) ◽  
pp. 42 ◽  
Author(s):  
Joel Heisler ◽  
Archana Chavan ◽  
Yong-Gang Chang ◽  
Andy LiWang
Keyword(s):  
Circadian Clock ◽  
Real Time ◽  
Fluorescence Anisotropy ◽  
Polyacrylamide Gel Electrophoresis ◽  
Live Cells ◽  
Ex Post ◽  
Clock Proteins ◽  
Ex Post Facto ◽  
Clock Reaction

Uniquely, the circadian clock of cyanobacteria can be reconstructed outside the complex milieu of live cells, greatly simplifying the investigation of a functioning biological chronometer. The core oscillator component is composed of only three proteins, KaiA, KaiB, and KaiC, and together with ATP they undergo waves of assembly and disassembly that drive phosphorylation rhythms in KaiC. Typically, the time points of these reactions are analyzed ex post facto by denaturing polyacrylamide gel electrophoresis, because this technique resolves the different states of phosphorylation of KaiC. Here, we describe a more sensitive method that allows real-time monitoring of the clock reaction. By labeling one of the clock proteins with a fluorophore, in this case KaiB, the in vitro clock reaction can be monitored by fluorescence anisotropy on the minutes time scale for weeks.

Real-Time On-Line Performance Diagnostics of Heavy-Duty Industrial Gas Turbines

2002 ◽  
Vol 124 (4) ◽  
pp. 910-921 ◽  
Author(s):  
S. C. Gu¨len ◽  
P. R. Griffin ◽  
S. Paolucci
Keyword(s):  
Real Time ◽  
Gas Turbines ◽  
Performance Monitoring ◽  
Engine Performance ◽  
Combined Cycle ◽  
Ex Post ◽  
Ex Post Facto ◽  
Industrial Gas Turbines ◽  
On Line ◽  
And Performance

This paper describes the results of real-time, on-line performance monitoring of two gas turbines over a period of five months in 1997. A commercially available software system is installed to monitor, analyze and store measurements obtained from the plant’s distributed control system. The software is installed in a combined-cycle, cogeneration power plant, located in Massachusetts, USA, with two Frame 7EA gas turbines in Apr. 1997. Vendor’s information such as correction and part load performance curves are utilized to calculate expected engine performance and compare it with measurements. In addition to monitoring the general condition and performance of the gas turbines, user-specified financial data is used to determine schedules for compressor washing and inlet filter replacement by balancing the associated costs with lost revenue. All measurements and calculated information are stored in databases for real-time and historical trending and tabulating. The data is analyzed ex post facto to identify salient performance and maintenance issues.

Real-Time On-Line Performance Diagnostics of Heavy-Duty Industrial Gas Turbines

2000 ◽  
Author(s):  
S. Can Gülen ◽  
Patrick R. Griffin ◽  
Sal Paolucci
Keyword(s):  
Real Time ◽  
Gas Turbines ◽  
Performance Monitoring ◽  
Engine Performance ◽  
Combined Cycle ◽  
Ex Post ◽  
Ex Post Facto ◽  
Industrial Gas Turbines ◽  
On Line ◽  
And Performance

This paper describes the results of real-time, on-line performance monitoring of two gas turbines over a period of five months in 1997. A commercially available software system is installed to monitor, analyze and store measurements obtained from the plant’s distributed control system. The software is installed in a combined-cycle, cogeneration power plant, located in Mass., USA, with two Frame 7EA gas turbines in April 1997. Vendor’s information such as correction and part load performance curves are utilized to calculate expected engine performance and compare it with measurements. In addition to monitoring the general condition and performance of the gas turbines, user-specified financial data is used to determine schedules for compressor washing and inlet filter replacement by balancing the associated costs with lost revenue. All measurements and calculated information are stored in databases for real-time and historical trending and tabulating. The data is analyzed ex post facto to identify salient performance and maintenance issues.

scholarly journals Real-time forecasting of ICME shock arrivals at L1 during the "April Fool’s Day" epoch: 28 March – 21 April 2001

2002 ◽  
Vol 20 (7) ◽  
pp. 937-945 ◽  
Author(s):  
W. Sun ◽  
M. Dryer ◽  
C. D. Fry ◽  
C. S. Deehr ◽  
Z. Smith ◽  
...  
Keyword(s):  
Real Time ◽  
Radio Burst ◽  
Type Ii ◽  
Interplanetary Shocks ◽  
Arrival Times ◽  
Interplanetary Coronal Mass Ejection ◽  
Coronal Shock ◽  
Ex Post ◽  
Interplanetary Physics ◽  
Ex Post Facto

Abstract. The Sun was extremely active during the "April Fool’s Day" epoch of 2001. We chose this period between a solar flare on 28 March 2001 to a final shock arrival at Earth on 21 April 2001. The activity consisted of two presumed helmet-streamer blowouts, seven M-class flares, and nine X-class flares, the last of which was behind the west limb. We have been experimenting since February 1997 with real-time, end-to-end forecasting of interplanetary coronal mass ejection (ICME) shock arrival times. Since August 1998, these forecasts have been distributed in real-time by e-mail to a list of interested scientists and operational USAF and NOAA forecasters. They are made using three different solar wind models. We describe here the solar events observed during the April Fool’s 2001 epoch, along with the predicted and actual shock arrival times, and the ex post facto correction to the real-time coronal shock speed observations. It appears that the initial estimates of coronal shock speeds from Type II radio burst observations and coronal mass ejections were too high by as much as 30%. We conclude that a 3-dimensional coronal density model should be developed for application to observations of solar flares and their Type II radio burst observations.Key words. Interplanetary physics (flare and stream dynamics; interplanetary shocks) – Magnetosheric physics (storms and substorms)

Pengaruh Motivasi, Sikap, Minat, dan Gaya Belajar Statistik Mahasiswa Terhadap Kemampuan Menganalisis Persoalan Penelitian

2020 ◽  
Author(s):  
Azis
Keyword(s):  
Random Sampling ◽  
Ex Post ◽  
Ex Post Facto

Tujuan penelitian ini untuk mengetahui bahwa motivasi, sikap, minat, dan gaya belajar statistik matematika mahasiswa secara bersama-sama berpengaruh positif terhadap kemampuan menganalisis persoalan penelitian; dan motivasi, sikap, minat, dan gaya belajar statistik matematika mahasiswa masing-masing berpengaruh positif terhadap kemampuan menganalisis persoalan penelitian. Jenis penelitian ini menggunakan metode ex post facto dengan desain korelasional. Penelitian ini dilaksanakan di Universitas Dayanu Ikhsanuddin Baubau pada Fakultas Keguruan dan Ilmu Pendidikan Program Studi Pendidikan Matematika yang pelaksanaannya pada semester Gasal Tahun Akademik 2016/2017. Populasinya adalah seluruh mahasiswa yang memprogram mata kuliah Statistik Matematika II Tahun Akademik 2016/2017 yang berjumlah 145 orang. Dengan menggunakan teknik random sampling, diambil minimal 30% dari keseluruhan sampel, dan diambil 51 orang. Instrumen yang digunakan untuk memperoleh data setiap variabel adalah angket dan tes yang disusun sendiri oleh peneliti. Teknik analisis yang digunakan untuk mengelolah data yang diperoleh dari responden adalah teknik statistik deskriptif dan inferensial. Berdasarkan hasil penelitian yang telah diuraikan, maka dapat disimpulkan bahwa: 1) motivasi, sikap, minat, dan gaya belajar statistik matematika mahasiswa secara bersama-sama berpengaruh positif terhadap kemampuan menganalisis persoalan penelitian; 2) motivasi belajar statistik mahasiswa berpengaruh positif terhadap kemampuan menganalisis persoalan penelitian; 3) sikap belajar statistik mahasiswa berpengaruh positif terhadap kemampuan menganalisis persoalan penelitian; 4) minat belajar statistik mahasiswa berpengaruh positif terhadap kemampuan menganalisis persoalan penelitian; dan 5) gaya belajar statistik mahasiswa berpengaruh positif terhadap kemampuan menganalisis persoalan penelitian pada mahasiswa pendidikan matematika FKIP Unidayan.

Analysis of the Effect of Cash Turnover on Liquidity at PT. Pekebun Nusantara VIII, Sukabumi Regency, West Java

2020 ◽  
Author(s):  
endang naryono
Keyword(s):  
Linear Regression ◽  
Correlation Coefficient ◽  
Secondary Data ◽  
Positive Influence ◽  
West Java ◽  
Financial Reports ◽  
A Value ◽  
Ex Post ◽  
Ex Post Facto

Research aims to understand gyrations cash pt .Had provided nusantara viii , liquidity to pt .Had provided nusantara viii , and to know the influence of gyrations cash on the level of liquidity to PT .Perkebunan nusantara VIII sukabumi .The methodology used is the method ex-post facto capital .This research using primary and secondary data obtained from financial reports and non financial from pt .Pekebunan nusantara viii sukabumi .To test hypotheses used linear regression and the correlation with on the spss 15.0 for windows. Based on the results of research shows that there is a positive influence between second match of cash and liquidity pt .Had provided nusantara viii sukabumi .A level of closeness ( correlation ) the second variables strong enough , are r = 0,800 with a value of a correlation coefficient r & gt; 0 it means if cash second match of getting up and liquidity will increase , and vice versa . While from the results of the equation above the results linear regression simple as follows: y = 185,137 + 0,045x means value ( a ) or constant of 185,137 who have the meaning that if cash two zero ( 0 ) or not increased so level of 185,137 liquidity .The score regression ( b ) of 0,045 the show the relation in line that every 1 increase point in cash and two rate rose to 185,137 liquidity

ANALISIS KORELASI PENERASI PENGGUNAAN INTERNET DI BEBERAPA NEGARA DENGAN KUALITAS SDM DAN PENDAPATAN PERKAPITA NEGARA

JURNAL PETIK ◽  
2018 ◽  
Vol 2 (1) ◽  
pp. 8
Author(s):  
Bpk Irwanto
Keyword(s):  
Ex Post ◽  
Ex Post Facto

Penelitian ini bertujuan untuk mengetahui hubunganantara besar penetrasi penggunaan internet di beberapa negaradengan kualitas sumber daya manusia (SDM) dan pendapatanperkapita negara. Hal ini untuk memberikan informasi bahwakemajuan suatu negara tidak lepas dari peran teknologi informasisalah satunya internet dalam memberikan kontribusi padaterciptanya SDM yang berkualitas sehingga kemudian akanmampu meningkatkan pendapatan perkapita negara. Penelitianini merupakan jenis penelitian ex-post facto dengan menggunakanmetode survey melalui pendekatan desain penelitian korelasionalkuantitatif. Subyek penelitian ini adalah 20 negara yang terdiridari 11 negara anggota ASEAN, Amerika Serikat, Jepang, China,Korea Selatan, India, Inggris, Francis, Mesir, dan Afrika Selatan.Dengan taraf signifikansi 0,05, hasil penelitian menunjukkanadanya hubungan yang signifikan antara penetrasi penggunaaninternet dengan kualitas SDM negara dengan angka korelasi 0,924dan dengan kontribusi signifikansi (R Square) sebesar 84,7%.Persamaan regresi yang terbentuk Y= 0,58 + 0,004X. Hasilpenelitian juga menunjukkan adanya hubungan yang signifikanantara penetrasi penggunaan internet negara dengan pendapatanperkapita negara dengan nilai koefisien korelasi Pearsonmenunjukkan angka 0,92 dan dengan kontribusi signifikansi (RSquare) sebesar 83,8%. Hasil penelitian juga mengatakan bahwapersamaan garis regresi yang terbentuk adalah Y= 151,688-1,616X

KREATIVITAS DAN HASIL BELAJAR

2018 ◽  
Vol 1 (1) ◽  
pp. 46-54
Author(s):  
Besse Intan Permatasari
Keyword(s):  
Mathematics Education ◽  
Learning Outcomes ◽  
Linear Algebra ◽  
Mathematics Learning ◽  
Student Learning Outcomes ◽  
Study Program ◽  
School Year ◽  
Ex Post ◽  
Ex Post Facto ◽  
Research Type

This study aims to determine whether there is an influence of creativity on mathematics learning outcomes of students of Mathematics Education in University of Balikpapan Study Program on Linear Algebra Courses. The approach used is a quantitative approach with ex post facto research type. The population of this research is all students of Mathematics Education Study Program Linear Algebra Course in the School Year 2017/2018, which are 49 students. Samples were chosen randomly are 25 students. The results showed that there is a positive and significant effect on student learning outcomes in Linear Algebra Subject

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