Hasil Pencarian  ::  Simpan CSV :: Kembali

"ABSTRACTOur present investigation aimed to examine the natural convection boundary layer flow of nanofluids over a vertical flat plate embedded in a saturated Darcy porous medium containing gyrotactic microorganisms. For carrying out the numerical solution, two steps are performed. The governing partial differential equations are firstly simplified into a set of highly coupled nonlinear ordinary differential equations by suitable similarity variables, and then numerically solved by applying the cubic spline collocation technique. The obtained similarity solution depends on non-dimensional parameters, i.e., the bioconvection Lewis number, bioconvection Rayleigh number, bioconvection Peclet number, Brownian motion parameter, the Buoyancy ratio, the thermophoresis parameter, the power-law variation index, and the Lewis number. A comprehensive numerical computation is carried out for various values of the parameters that describe the flow characteristics. Rescaled velocity and temperature distributions are found to be depending strongly on the bioconvection Rayleigh number and power-law variation index parameter. For making the result more reliable a comparison has been shown in the present work with existing results for some special values of governing parameters and the results are found to be in excellent accuracy."

"Tungsten Inert Gas (TIG) adalah sebuah metode pengelasan yang menggabungkan material dengan cara memanaskannya dengan busur las. Elektroda yang digunakan berbahan tungsten dan bersifat non-consumable. Penambahan medan magnet eksternal secara permanen selama proses pengelasan adalah salah satu perkembangan pengelasan TIG. Penambahan medan magnet eskternal pada penelitian ini dilakukan untuk mengetahui pengaruhnya terhadap geometri lasan berupa bentuk busur las, lebar manik las, dan kedalaman penetrasi. Magnet yang digunakan memiliki dua ukuran dan empat belas konfigurasi yang berbeda berdasarkan peletakannya. Masing-masing konfigurasi dilakukan sebanyak tiga kali repetisi pengelasan. Dari hasil uji ANOVA, semua konfigurasi memiliki perbedaan rata-rata yang signifikan secara statistik. Hal ini disebabkan pada tiap konfigurasi memiliki keberagaman garis-garis gaya magnet dan besarnya medan magnet, sehingga akan memengaruhi geometri busur las yang berdampak pada lebar manik dan kedalaman las. Busur las yang telah dimampatkan oleh garis gaya magnet cenderung memiliki area kontak panas yang kecil sehingga panas terpusat, menghasilkan lebar manik las yang sempit dan penetrasi las yang dalam. Konfigurasi yang memiliki peningkatan rasio D/W (depth/width) paling tinggi dari pengelasan non magnet (netral) adalah konfigurasi F Forward untuk tebal magnet 3 mm dan 5 mm.

---

Tungsten Inert Gas (TIG) is a welding method that combines materials by heating them with a welding arc. The electrodes used are made of tungsten and non-consumable. The addition of a permanent external magnetic field (EMF) during the welding process is one of the developments in TIG welding. The addition of the external magnetic field in this study was carried out to determine its effect on the weld geometry in the form of weld arc shape, weld bead width, and penetration depth variously. The magnets used have two sizes and fourteen different configurations based on their placement. Each configuration is performed three times of welding reps. From the results of the ANOVA test, all configurations have mean differences that are statistically significant. This is because each configuration has a variety of magnetic lines of force and magnetic field magnitude, so it will affect the geometry of the blow arc which has an impact on the weld bead width and the depth penetration of the weld. A weld arc that has been compressed by magnetic lines of force tends to have a small hot contact area so that the heat is concentrated, resulting in a narrow weld bead width and deep weld penetration. The configuration that has the highest increase in D/W (depth / width) ratio from non-magnetic (neutral) welding is the F Forward configuration for 3 mm and 5 mm thick magnets"

"Disajikan ulangnya Voluntary Servitude dalam tataran politis menghadirkan alur baru dalam memandang politik, terkhusus pada praktik kuasa atau relasi dominasi, bahwa dominasi terjadi bukan karena pemaksaan kehendak dari yang berkuasa kepada yang dikuasai melainkan karena sukarela. Preasumsi tentang langgengnya dominasi bukanlah terletak pada manusia yang haus akan kuasa atau kejam bagi manusia lainnya, melainkan langgengnya dominasi terjadi karena fenomena servility sudah turun- temurun terjadi hingga menjadi budaya, hal tersebut mengakibatkan kebebasan tidak lagi dipandang sebagai sesuatu yang secara alamiah dimiliki setiap orang melainkan sesuatu yang harus diraih. Kebebasan yang perlu diraih bukan kebebasan yang terbebas dari dominasi sebagai suatu kondisi saja, melainkan kebebasan yang yang diraih melalui negasi epistemologis, terhadap ide tentang dominasi yang dimiliki oleh The Master atau yang berkuasa. Maka dari itu epistemologi baru sebagai absence dari epistemologi The Master harus dibentuk atau epistemologi the slave, dengan tujuan menjadi tahap lanjutan dari pembebasan diri dari dominasi.

---

The restatement of Voluntary Servitude at the political level presents a new path in viewing politics, especially in the practice of power or relations of domination, that domination occurs not because of coercion of the will of the ruling to the ruled but because of voluntary. The assumption about the perpetuation of domination does not lie in humans who are hungry for power or cruel to other humans, but rather the perpetuation of domination occurs because servility phenomena have passed down through generations to become a culture, as something that must be achieved. The freedom that needs to be achieved is not freedom that is free from domination as a condition, but rather the freedom achieved through epistemological negation, to the idea of domination which belongs to The Master or the ruling. Therefore a new epistemology as the absence of epistemology of The Master must be formed or The Epistemology of the slave, with the aim of becoming an advanced stage of liberation from domination."