change of support
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2021 ◽  
Vol 2 (2) ◽  
pp. 65-74
Author(s):  
Raymond Kosher Sianturi ◽  
Mohamad Nur Heriawan ◽  
Syafrizal Syafrizal ◽  
Cahyo Okta Ardian ◽  
Satyogroho Dian Amertho ◽  
...  

Blok C merupakan salah satu blok endapan aluvial di Pulau Bangka yang memiliki prospek timah dan mineral ikutan timah seperti ilmenite, rutile, anatase, zircon, dan monazite. Endapan aluvial umumnya memiliki variabilitas yang tinggi sehingga faktor ketidakpastian akan sumberdaya timah dan mineral ikutan timah juga tinggi. Pada penelitian ini dilakukan perbandingan antara 3 (tiga) pendekatan geostatistik untuk memodelkan ketidakpastian sumberdaya dengan studi kasus pada endapan aluvial di Blok C di Pulau Bangka. Untuk mengetahui variabilitas global di daerah penelitian dilakukan dengan menggunakan metode Global Estimation Variance (GEV), sedangkan untuk mengetahui variabilitas lokal dilakukan menggunakan Sequential Gaussian Simulation (SGS) dan Discrete Gaussian Model (DGM). Hasil dari metode GEV dibandingkan dengan metode SGS dan hasil dari metode SGS juga akan dibandingkan dengan metode DGM. Dari hasil perbandingan GEV dan SGS menunjukkan bahwa hasil GEV cenderung less confidence jika dibandingkan dengan hasil SGS. Less confidence pada hasil GEV disebabkan oleh efek proporsional di daerah penelitian. Hasil perbandingan SGS dan DGM menunjukkan pola yang hampir sama untuk Sn (timah) dan ilmenite+rutile+anatase serta pola yang cukup berbeda untuk zircon. Perbedaan ini disebabkan oleh pemusatan data yang merupakan bagian dari metode DGM. Selain itu, mayoritas nilai minimum hasil DGM lebih besar daripada nilai minimum hasil SGS dan nilai maksimum hasil DGM lebih kecil daripada nilai maksimum hasil SGS. Hal ini disebabkan oleh change of support coefficient (r) yang mempengaruhi fungsi dari transformasi


Author(s):  
G. Buttafuoco ◽  
R. Quarto ◽  
F. Quarto ◽  
M. Conforti ◽  
A. Venezia ◽  
...  

Author(s):  
Andrew M. Raim ◽  
Scott H. Holan ◽  
Jonathan R. Bradley ◽  
Christopher K. Wikle

2019 ◽  
Vol 122 ◽  
pp. 68-76 ◽  
Author(s):  
Mauricio Garrido ◽  
Julian M. Ortiz ◽  
Francisco Villaseca ◽  
Willy Kracht ◽  
Brian Townley ◽  
...  

2018 ◽  
Author(s):  
Muhammad Subhan

The vote of political parties in the general election is influenced by voter behavior. The spreadof this radical idea aims to gain support, influence people's choices,This is a basic research we developthe mathematical model that not only fits the dynamics of a radical political force or force in context ofgeneral elections, but also can be used for modeling of different outcomes of the political behavior of asociety in elections and in other conceptually similar forms of political expression. . In this study we willconstruct a system of differential equations by considering the dissemination of radical ideas fromRadical and Other supporters to Indifferent voters who are targeted by both parties in obtaining support orvoting in the election resulting in a change of support for each party with . The results of the analysisshould that stability behavior of each fixed point is strongly influenced by the condition value of modelparameters is the rate of movement of each party, then will be tested some cases of the possibility thatwill happen with analytic and verification with numeric.


2017 ◽  
Vol 8 (2) ◽  
pp. 594-599 ◽  
Author(s):  
A. Castrignanò ◽  
R. Quarto ◽  
A. Venezia ◽  
G. Buttafuoco

The paper proposes a geostatistical framework to solve the issues of heterogeneous support for spatial estimation. Apparent soil electrical conductivity (ECa) was measured in a field cropped with San Marzano tomato using a multiple frequency electromagnetic profiler with 6 operating frequencies. Mixed support kriging was used to estimate ECa taking into account the change of support. The method includes punctual kriging with the error being the dispersion variance associated with each frequency. The individual ECa maps were weighted by the dispersion variance to obtain a map which was used for field partition in management zones.


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