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All Journal Journal of Indonesian Applied Economics Journal of Mathematical and Fundamental Sciences
Nurhasan Nurhasan
Institut Teknologi Bandung
Astronomy Chemistry Earth & Planetary Sciences Economics, Econometrics & Finance Mathematics Physics

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Direct Method Solution of 3-D Magnetotelluric Modeling Using Vector Finite Element Method Rudy Prihantoro; Doddy Sutarno; Nurhasan Nurhasan
Journal of Mathematical and Fundamental Sciences Vol. 51 No. 1 (2019)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2019.51.1.7

Abstract

As exploration is forced into more difficult areas with complex three-dimensional (3-D) structural environments, the importance of 3-D magnetotelluric (MT) modeling is essential for the correct interpretation of MT data. To reduce the complexity of the calculations introduced by 3-D models, iterative forward calculation of MT response functions is used as basis for inversion of 3-D MT data. This paper proposes an alternative procedure for making reliable 3-D MT modeling codes for forward calculation that is not only effective but also accurate. This is accomplished by using a direct method to solve the linear systems arising from the discretization process in the vector finite element approach. The vector finite element method is known for its capability of overcoming difficulties in modeling caused by possible jumps of normal components across discontinuities of material properties. Meanwhile, by using a direct method rather than an iterative method, the process of solving the linear equations does not suffer from slow convergence. Here, we present a comparison between our modeling codes and codes based on a different approach. In the resulting 3-D MT responses it was found that the proposed method has high accuracy.
An Analysis of Consumer Behaviors in Choosing Public Transportation Hadhori Nurhasan; Utomo Sarjono Putro
Journal of Indonesian Applied Economics Vol. 9 No. 2 (2021)
Publisher : Department of Economics, Faculty of Economics and Business, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jiae.009.02.3

Abstract

Various efforts have been done to overcome or at least reduce the severe congestion in Jakarta. For this reason, the local government continues to carry out various strategies. And PT TransJakarta as a company under the auspices of the local government that manages several modes of transportation, also has a big role in overcoming congestion in Jakarta. One of them is by launching several public transportations so that many people will switch to use public transportation. Recently, Transjakarta launched a microbus type public transportation called Mikrotrans. To make it works, TransJakarta must be able to attract public interest to use microtrans. For this reason, a special strategies are needed to attract customers. One of the most important aspects is by controlling the quality of the service in order to make customer satisfied. Several aspects of microtrans service quality are investigated which have major influences on increasing customer satisfaction. And the results show that in general the quality of service at Mikrotrans is quite good. The result shows that the variables of service quality in mikrotrans are good enough in the customer although it still requires evaluation or improvement in several aspects
Co-Authors Doddy Sutarno Rudy Prihantoro Utomo Sarjono Putro