Traditional Art Kayori as an Identity of Taa Society in District of Tojo Una-Una in Globalization Era

Kayori is someone's or group's statement expressed civilly in a particular time, so that the messages delivered are easily internalized and understood to nod in agreement. This research intends to identify form, function, and meaning contained in kayori traditional art of Taa society. This research employed qualitative method with a cultural approach. The results of this study portray that kayori performance periodically held is an introduction media in increasing public awareness. Kayori, embracing aesthetic values, functions to diffuse moral and aesthetic aspects to the society. Education in kayori tradition follows the regeneration process in to society orientating towards the new roles for young generation to maintain their cultural heritages. Kayori tradition implies valuable meaning of life and provides chance in understanding historical cultural heritages in tackling down recent issues in Taa society

Analisa Kegagalan Material Sa-210c Pada Aplikasi Boiler Steam Pipe

The purpose of this study was to determine the cause of pipe failure in super saturated area boilers. The research method begins with the collection of chronological data on material failure, operating data collection and material sampling. After material sampling is carried out, photos of failed material are subsequently carried out, thickness measurements, hardness testing, metallographic testing and internal pipe pressure calculations. The results showed that the outside of the pipe had erosion corrosion due to a reduction in thickness of the pipe, especially location 1. Thickening was caused by high pressure auxiliary steam bursts from the sootblower equipment which lasted for a long time at the pipe surface, resulting in Fe + O FeO reaction. FeO formed at the beginning will be released due to high-pressure auxiliary steam bursts and at the same time the auxiliary steam burst reacts chemically again to form FeO. Because of the repeated processes, the pipe thickness slowly decreases. As a result of the depletion, the pipe reaches a critical value so it is unable to withstand the pressure from the pipe and eventually fails. The failure factor, supported by some data on boiler water quality and continuous operating pressure from sootblower that affect erosion corrosion. Changes in microstructure also affect the decrease in hardness in the material which can be seen from the size and shape of the grain

Analisa Kegagalan Material Sa-210c Pada Aplikasi Boiler Steam Pipe

Tujuan penelitian ini adalah untuk mengetahui penyebab kegagalan pipa pada ketel uap daerahsuper jenuh (superheat). Metode penelitian diawali dengan pengumpulan data kronologi kegagalanmaterial, pengumpulan data operasi dan pengambilan sampel material. Setelah pengambilansampel material dilakukan, untuk selanjutnya dilakukan foto fisik material gagal, pengukuranketebalan, pengujian kekerasan, pengujian metalografi dan perhitungan tekanan internal pipa. Hasilpenelitian menunjukkan, bagian luar pipa telah mengalami korosi erosi karena adanya penguranganketebalan pada pipa, terutama lokasi 1. Pengurangan ketebalan disebabkan semburan uap bantubertekanan tinggi dari peralatan sootblower yang berlangsung lama pada permukaan pipa dilokasi1, sehingga menghasilkan reaksi Fe + O FeO. FeO yang terbentuk diawal akan terlepas akibatsemburan uap bantu bertekanan tinggi dan pada saat yang sama semburan uap bantu bereaksikimia kembali membentuk FeO. Karena proses yang berulang-ulang, maka secara perlahanketebalan pipa berkurang. Akibat penipisan tersebut, pipa mencapai nilai kritis sehingga tidakmampu menahan tekanan dari dalam pipa dan akhirnya mengalami kegagalan/ pecah. Faktorkegagalan tersebut, didukung dengan beberapa data kualitas air ketel uap dan tekanan operasiterus menerus dari sootblower yang mempengaruhi terjadinya korosi erosi. Perubahan strukturmikro juga berpengaruh terhadap penurunan kekerasan pada material yang dapat dilihat dari ukurandan bentuk butir

Rational invariant subspace approximations with applications

Includes bibliographical references.Subspace methods such as MUSIC, Minimum Norm, and ESPRIT have gained considerable attention due to their superior performance in sinusoidal and direction-of-arrival (DOA) estimation, but they are also known to be of high computational cost. In this paper, new fast algorithms for approximating signal and noise subspaces and that do not require exact eigendecomposition are presented. These algorithms approximate the required subspace using rational and power-like methods applied to the direct data or the sample covariance matrix. Several ESPRIT- as well as MUSIC-type methods are developed based on these approximations. A substantial computational saving can be gained comparing with those associated with the eigendecomposition-based methods. These methods are demonstrated to have performance comparable to that of MUSIC yet will require fewer computation to obtain the signal subspace matrix

Single-Dirac-Cone topological surface states in TlBiSe2 class of Topological Insulators

We have investigated several strong spin-orbit coupling ternary chalcogenides related to the (Pb,Sn)Te series of compounds. Our first-principles calculations predict the low temperature rhombohedral ordered phase in TlBiTe2, TlBiSe2, and TlSbX2 (X=Te, Se, S) to be topologically Kane-Mele Z2 = -1 nontrivial. We identify the specific surface termination that realizes the single Dirac cone through first-principles surface state computations. This termination minimizes effects of dangling bonds making it favorable for photoemission (ARPES) experiments. Our analysis predicts that thin films of these materials would harbor novel 2D quantum spin Hall states, and support odd-parity topological superconductivity. For a related work also see arXiv:1003.2615v1. Experimental ARPES results will be published elsewhere.Comment: Accepted for publication in Phys. Rev. Lett. (2010). Submitted March 201

Towards the Formal Reliability Analysis of Oil and Gas Pipelines

It is customary to assess the reliability of underground oil and gas pipelines in the presence of excessive loading and corrosion effects to ensure a leak-free transport of hazardous materials. The main idea behind this reliability analysis is to model the given pipeline system as a Reliability Block Diagram (RBD) of segments such that the reliability of an individual pipeline segment can be represented by a random variable. Traditionally, computer simulation is used to perform this reliability analysis but it provides approximate results and requires an enormous amount of CPU time for attaining reasonable estimates. Due to its approximate nature, simulation is not very suitable for analyzing safety-critical systems like oil and gas pipelines, where even minor analysis flaws may result in catastrophic consequences. As an accurate alternative, we propose to use a higher-order-logic theorem prover (HOL) for the reliability analysis of pipelines. As a first step towards this idea, this paper provides a higher-order-logic formalization of reliability and the series RBD using the HOL theorem prover. For illustration, we present the formal analysis of a simple pipeline that can be modeled as a series RBD of segments with exponentially distributed failure times.Comment: 15 page