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"Kami mempelajari sifat atau karakteristik penggunaan fungsi kopling A pada teori skalar tensor terhadap massa-radius bintang neutron. Kami membatasi pengerjaan ini untuk kasus bintang statik dengan simetri bola. Teramati, fungsi kopling yang dipilih menghasilkan fenomena spontaneous scalarization pada kasus bintang neutron dengan persamaan keadaan politropik dan persamaan keadaan NL3 pada bintang neutron saat nilai asymp; -4.5. Namun, skalarisasi tidak terjadi untuk EoS G2 dengan hyperon. Lebih lanjut, pada kasus bintang quark fenomena skalarisasi juga terjadi saat ? asymp; -4.5 baik dengan penggunaan EoS Scalar Coulomb maupun EoS Vector Coulomb.

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We study the characteristic of choosing coupling function A in scalar tensor theory to find mass radius relation from the neutron star. We resrict the case for static with spherical simetric star. We observe, the choosing of our coupling function produce spontaneous scalarization phenomenon in neutron star with polytropic equation of state and NL3 equation of state in neutron star when asymp 4.5. But, scalararization does not occur when using G2 with hyperon equation of state. Furthermore, in quark star case scalarization phenomenon also occur when asymp 4.5 for both Scalar Coulomb and Vector Coulomb equation of state."

"This research addresses the problem of finding a minimum Hamming Weight by proposing a left-to-right recoding of integers (from the most significant bit to the less significant one). This representation is the enhanced and modified version of a well-known recoding method called Generalized Non-Adjacent Form (G-NAF). Scanning the digits from the left-to-right is called Modified Generalized Signed Digit Non-Adjacent Form (MGSDNAF), which unlike the G-NAF, presents the ‘nice property’ to be obtained. A ‘nice property’ is one that is based on intuition and is particularly desirable to be obtained in a given context. This processing direction is of great importance because a table of pre-computed values may be used to speed up the scalar multiplication only for that direction. A subsequent advantage is that recoding the exponent in advance is not required. This results in better performances in both running time and memory space. This representation method can reduce the Hamming Weight of integers from about 21.6% for radix 3 to 15.1% for radix 9. These numbers for G-NAF recoding are 16.7% and 8.9% respectively. Comparing these numbers together shows that efficiency of the proposed method in reducing the Hamming Weight is more than the efficiency of G-NAF, which is from 30% (for radix 3) to more than 65% (for radix 9) more efficient in reducing the Hamming Weight. Finally, two radix 3 single scalar multiplication methods for Elliptic Curve Cryptography (ECC), which are based on G-NAF and Left-to-Right MGSDNAF, are compared in order to examine the application of the proposed method in cryptography. The results show that the proposed method can reduce the number of underlying arithmetic operations in single scalar multiplication by 14.1% while G-NAF can only reduce this number by 11.5%."

"Kompaktifikasi dimensi ekstra 5D dengan suku kinetik hukum pangkat (power law), telah berhasil menggulung satu dimensi ekstra, serta memperoleh informasi radius dan kestabilannya. Namun dari kajian tersebut didapatkan kompaktifikasi yang bersifat anti-de sitter (Ads) pada empat dimensi. Hal yan menunjukkan bahwa lagrangian yang dipilih belum sesuai dengan lagrangian alam semesta tempat kita berada yang mengharuskan bersifat de sitter (dS).

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The 5D extra dimension compatibility with the power law kinetic terms, has succeeded in rolling an extra dimension, and obtained information on its radius and stability. However, from this study, it was found that anti-de sitter compactification (Ads) in four dimensions was obtained. This shows that the selected lagrangian does not match the universe we are in, which requires it to be de sitter (dS)."