423 research outputs found
Pengaruh Tekanan dan Ukuran Pasir pada Proses Sand Blasting dengan Menggunakan Media Pasir Lumajang terhadap Hasil Kekasaran dan Laju Korosi Permukaan Baja AISI 304
No full textABSTRAK Sarmaman, Tito. 2019. Pengaruh Tekanan dan Ukuran Pasir pada Proses Sand Blasting dengan Menggunakan Media Pasir Lumajang terhadap Hasil Kekasaran dan Laju Korosi Permukaan Baja AISI 304. Skripsi. Jurusan Teknik Mesin, Fakultas Teknik, Universitas Negeri Malang. Pembimbing: (I) Aminnudin, S.T., M.T, (II) Dr. Heru Suryanto, S.T., M.T. Kata Kunci : sandblasting, pasir Lumajang, AISI 304, kekasaran, korosi Teknik sandblasting merupakan suatu teknik yang menggunakan udara bercampur dengan abrasif (pasir) bertekanan tinggi yang ditembakkan pada permukaan material benda uji dengan tujuan untuk menghilangkan kotoran atau material-material yang menempel seperti karat, cat, garam, dan oli. Media abrasif atau pasir yang biasa digunakan adalah pasir silika atau yang dikenal sebagai pasir kuarsa, namun penggunaan pasir kuarsa sebagai bahan abrasif sangat berbahaya karena pasir ini memiliki unsur penyusun kimia SiO2 berupa kristal silika yang dapat menyebabkan silikosis bagi operator blasting. Media abrasif lain yang dapat digunakan dalam proses sandblasting adalah pasir copper slag, pasir garnet dan steel grit. Berdasarkan ketiga media abrasif tersebut memang yang paling umum digunakan adalah pasir silika, akan tetapi pasir tersebut mengandung unsur kimia SiO2, silikon dioksida dapat mengakibatkan penyakit silikosis bagi operator dikemudian hari, maka pemanfaatan pasir lokal yang mana dalam hal ini menggunakan pasir Lumajang sebagai media abrasif dalam proses blasting Dalam penelitian ini bertujuan untuk mengetahui (1) pengaruh variasi tekanan terhadap hasil kekasaran pada permukaan dari baja AISI 304. (2) pengaruh variasi ukuran pasir terhadap hasil kekasaran pada permukaan dari baja AISI 304. (3) pengaruh variasi tekanan terhadap hasil laju korosi pada permukaan dari baja AISI 304. (4) pengaruh variasi ukuran pasir terhadap hasil laju korosi pada permukaan dari baja AISI 304 dengan beberapa variasi parameter yaitu tekanan 4; 4,4; 4,7 bar serta dengan ukuran pasir mesh 40, 60, dan 80, benda uji menggunakan baja AISI 304 dan pengujian dilakukan menggunakan surface roughness test Mitutoyo SJ 301 dan cairan korosif HCl 1.5 M dengan lama perendaman 2 minggu. Hasil penelitian ini menunjukkan: (1) Tekanan berpengaruh terhadap hasil kekasaran dari permukaan benda uji, nilai kekasaran terendah terjadi pada tekanan 4 bar yaitu 1,01 μm, sedangkan nilai kekasaran tertinggi terjadi pada tekanan 4,7 bar yaitu 1,94 μm (2) Perbedaan ukuran pasir berpengaruh terhadap hasil kekasaran benda uji, nilai terendah terjadi pada ukuran mesh 80 yaitu 1,01 μm, sedangkan nilai kekasaran tertinggi terjadi pada ukuran mesh 40 yaitu 1,94 μm (3) Tekanan mempengaruhi nilai laju korosi, nilai terendah terjadi pada tekanan 4 bar yaitu 0,3931 mpy, sedangkan yang tertinggi terjadi pada tekanan 4,7 bar yaitu 0,6818 mpy. (4) Perbedaan ukuran pasir mempengaruhi nilai laju korosi, nilai terendah terjadi pada ukuran mesh 80 yaitu 0,3931 mpy, sedangkan yang tertinggi terjadi pada ukuran mesh 40 bar yaitu 0,6818 mpy. ABSTRACT Sarmaman, Tito. 2019. The Effect of Pressure and Sand Size on the Sand Blasting Process Using Lumajang Sand Media on Surface Roughness and Corrosion Rate of AISI 304. Undergraduate Thesis. Department of Machine Engineering, Faculty of Engineering, State University of Malang. Supervisors: (I) Aminnudin, S.T., M.T, (II) Dr. Heru Suryanto, S.T., M.T. Keyword : sandblasting, Lumajang sand, AISI 304, roughness, corrosion The sandblasting is a technique using air mixed with high-pressure abrasive (sand) which is blasted on the surface of the materials for removing impurities such as rust, paint, salt, and oil. Abrasive media or sand commonly used is silica sand or known as quartz sand, however it is very dangerous because this sand has a chemical constituent of SiO2 in the form of silica crystals which can cause silicosis for blasting operators. Other abrasive medias that can be used in the sandblasting process are copper slag sand, garnet sand and steel grit. therefore, the local sand in form of Lumajang sand is very potential as an abrasive medium replacement in blasting process. This study aims to determine the effect of pressure and sand size variation on the surface roughness and corrosion rate of the AISI 304. The pressure variation of 4; 4.4; 4.7 bar and with the size of 40, 60 and 80 of mesh sands, were used in this experiment. The tests were done using Mitutoyo SJ 301 surface roughness tester and 1.5 M HCl corrosive liquid with 2 weeks immersion time for the corrosion analysis. The results of this study indicate that the pressure affects the roughness results from the surface of the test object, where the lowest roughness value occurs at 4 bar pressure with the Ra of 1.01 μm, while the highest roughness value occurs at 4.7 bar pressure with the Ra of 1.94 μm. The sand size affects the roughness of the test object, where the lowest value occurs at 80 mesh size with the Ra of 1.01 μm, while the highest roughness value occurs at 40 mesh size with the Ra of 1.94 μm. On the other hand, the pressure affects the corrosion rate, where the lowest value occurs at a pressure of 4 bar with the corrosion rate of 0.3931 mpy, while the highest is at a pressure of 4.7 bar with the corrosion rate of 0.6818 mpy. The sand size affects the value of the corrosion rate, where the lowest value occurs in the mesh size of 80 with the corrosion rate of 0.3931 mpy, while the highest occurs in the mesh size of 40 bar with the corrosion rate of 0.6818 mpy
Explaining Islamist insurgencies the case of al-Jamaah al-Islamiyyah and the radicalisation of the Poso conflict, 2000-2007
No full textNational question in Yugoslavia in the light of the Liberation War
No full textTitle: Nacionalno pitanje u Jugoslaviji u svjetlosti Narodnooslobodilačke borbe (National question in Yugoslavia in the light of the Liberation War) Originally published: Proleter No. 16, September 1942 Language: Serbo-CroatianThe excerpts used are from Josip Broz Tito, Borba za oslobođenje Jugoslavije I, 1941–1945 (Beograd: Kultura, 1947), pp. 130–148. About the author Josip Broz Tito (originally named Josip Broz) [1892, Kumrovec (present-day Croatia) – 1980, Ljubljana]: politician, the lead..
Nuvole in silenzio Arnold Schoenberg svelato
No full textThe book tells the history of how, and why Arnold Schoenberg invented his serial musical style.
It collects every musical score, every writing, every letter, every other document to reconstruct the way
followed by the composer between 1912 and 1925. First, the author discovered even in the
{\it Jakobsleiter} a twelve tones row never noticed before. Other unreliable, philosophical, political,
biased studies on Schoenberg are criticized
An Argument for Footnotes: The Special Case of Translating Tito Maniacco’s Mestri di mont (2007)
No full textThe works of Italian/Friulian author, Tito Maniacco (1932–2010), including Mestri di mont (2007), incorporate a multitude of allusions. One of the problems authors face when using allusions is that, if their reader does not recognize the allusion, meaning can be lost. This problem is exacerbated when a work moves across cultural borders. While Mestri di mont is written in Italian, the Friulian language features prominently, and there is also a smattering of French and Latin. In this article, I discuss my approach to handling these two challenges in bringing this text across into English: the multiple languages and allusions. My aim is to explain why footnotes were my chosen strategy for transmitting additional information to a new readership. In the field of translation, footnotes are controversial. In the case of Mestri di mont, footnotes served to convey information and insights for an improved reading experience.Full Tex
The Mathematical Contributions of Francesco Maurolico to the Theory of Music of the 16th Century
No full textFrancesco Maurolico wrote quite a number of pages also about music,
which were transcribed and edited by the author
in Maurolico {\it Opera Mathematica} (www.maurolico.unipi.it).
Here, in part I, his main results are presented, as well as their differences
compared with the classical tradition of the mathematical theory of music.
These results are: a new proof
of the number of commas in the tone, the theory of ``ictus'', and a new
notation for the composition of proportions. This is followed, in part II, by
an explanation of how the original {\it corpus} of these folios was put
together. Finally, part III discusses
the complex puzzle of the manuscripts (one still extant,
another probably lost, ...),
and of their possible connections with the 1575 edition of a part of the
{\it corpus}. Possible
scenarios of the story of the manuscripts and probable interventions of the
Jesuits on this edition are described.
Correction: LotuS: an efficient and user-friendly OTU processing pipeline
Full text linkThe name of the second author was incorrect in the original published article. The correct author name is Raul Y Tito
Josip Broz Tito Becoming the Leader of the Communist Party of Yugoslavia
Full text linkThe basic aim of this essay is to point to some basic moment in life struggles of Josip Broz Tito from 1928 to 1941 - the period forming in itself one closed entity: the most important characteristic of it being Tito's becoming the leader of the Communist Party of Yugoslavia (CPY) and his work on its consolidation during the years immediately preceeding the fall of the Kingdom of Yugoslavia.
The author is beginning with a short review of the importance of Tito struggling against conflicts of fractionization tendencies inside the CPY (KPJ) which were driving the party towards the decline. The highest point in Tito's contribution to this struggle was his being elected the new political secretary on the Eighth Conference of the Local Committee of the Organization of CPY in Zagreb, in February 1928. The author continues with giving a short review of the years of Tito's imprisonment from 1928 to 1934, as that period was very important for his personal ideological and political development. The following stage of Tito's life is represented in his work with the emigrated leadership of CPY and later in Comintern when he was acting as the commissioner for the Yugoslav Party problems. The basic characteristics of this stage are to be found in Tito's efforts to obtain the assent of the Comintern to let the leadership of CPY re-enter the country and take the immediate lead of the communist movement which was passing a powerful crisis at the time. He succeeded in 1936. In autumn 1936 he became the organizational secretary of CPY, the fact which indubitably meant the beginning of the new stage. The following year Tito took over completely the role of the leader of CPY, and with regards to the important results achieved in that very short period that was only a logical consequence. The author concludes pointing to the basic moments of the activity of Tito on consolidating CPY in the country (strengtheing the organization of CPY, liquidation of the party fractions, founding of CP of Croatia and Slovenia, the work with youth etc), the summit of such work being in the Fifth Pan-Country Conference, held under the direct leadership of Tito in October 1940
Tito Leader of the Fight Against Stalinism
Full text linkThe author is analysing some basic aspects of fight Tito raised against Stalinism, pointing to the importance of that fight in certain short periods. After the short review of the period immediately preceding the Second World War as well as the period during the war i. e. Liberation War of Yugoslav people from 1941 to 1945, the author puts the stress on after-war period. He is re-considering the importance of conflict of Communist Party of Yugoslavia (CPT) and Informbiro (Information Bureau of Comintern) in 1948. The conflict with the Information Bureau brought Yugoslavia into a very difficult situation as it resulted in economic blockade, in political and even army suppression which called for ever larger expenses for national defense; but it quickly improved the knowledge of the negative sides of that time administrative and centralization system. Understanding that the causes of the viewpoint the leadership of USSR took towards Yugoslavia were to be found in the deformed social relations that had developed there already before the war while after the war they were non-critically spread on other East-European countries, brought the conviction that the victory over Stalinism was not to be won if limited only to throwing off the unjust accusations and criticizing the deformed social and political relations, but that there should be started the building-up of a new social and political socialist system which would escape such deformations. New social relations should necessarily include democratization on a larger scale and lead to giving greater rights and freedom to masses. The historical merit of CPT under the leadership of Tito is that they started to destroy the centralization and state-socialism at the time when both were considered the only possible realization of socialism and that they started introducing the system of self-governing
TITO DORČIĆ AS A FORERUNNER OF THE IRONIC MODE
Full text linkPrema Northropu Fryeu, književnost XX. stoljeća obilježuju likovi koji imaju manje inteligencije i time slabiju moć te suženiji opseg djelovanja od prosječnoga čovjeka. Tipični su protagonisti Kafkinih i Beckettovih djela kojima manjkaju osnovne informacije o vlastitu položaju – stoga svjedočimo prizorima zarobljenosti i nemoći.
Ovakvim likovima prethodi i dobrim dijelom pripada Novakov Tito Dorčić iz istoimenoga romana, koji je zarobljen svojim predispozicijama i sredinom te je nesretan u "boljem životu" koji mu obrazovanjem nameću roditelji. Potpun neuspjeh pokazuje u braku i u karijeri. Interpretatori nalaze uzroke u darvinističkim teorijama pripovjedača i samoga autora Novaka te psihoanalitičkim tumačenjima zbilje koje ističe novija kritika; obje teorije nesvjesno svjedoče o smanjenoj moći protagonista. Završni prizor u kojem je Tito Dorčić mrtav ukliješten između stijena i napola u moru sinegdoha je njegove ukupne životne situacije. Ustroj žrtvenoga jarca (scapegoat mechanism), kako ga tumači René Girard, također dobro tumači događaje u životu Tita Dorčića: društvena kriza tek naizgled nije jače naglašena, no Tito je prikazan kao osoba koja zauzima položaj što mu ne pripada zbog smanjene inteligencije, nemorala i nekulture; griješi na poslu, a za smrt nevinoga čovjeka on najviše strada; već je prije toga bio obilježen krivnjom za raspad svojega braka. Konačno gubi posao, zapada u ludilo, čime se i sâm kažnjava i napokon umire. Tekst ili pripovjedač ubijaju ga, što je samo posljednji korak u dugu postupku ocrnjivanja glavnoga lika.According to Northrop Frye, 20th-century literature is marked by characters whose intelligence and capabilities are lesser than those of the average human. Typical such figures are the protagonists of Kafka’s and Beckett’s works, who lack even the most basic information regarding their own position – due to which the reader has the sense of looking down on scenes of bondage, frustration or absurdity. Vjenceslav Novak’s Tito Dorčić, from the eponymous novel, is a forerunner of this type of character. He is trapped by his own predisposition and social environment and becomes unhappy in the "better life" imposed on him by his father. He is utterly unsuccessful in his career as well as in his family life. 20th-century interpreters found the cause of Tito’s state, or the source for such a character, in Darwinist theories supposedly praised by the novel’s author; a more recent critic emphasises the psychoanalytic motifs. Both theories unconsciously bear witness to the reduced power of the action of the protagonist. The novel’s final scene, in which Tito Dorčić’s left leg is stuck in a crevice whilst the upper part of his body immersed in the sea is a metaphor of his entire life. The scapegoat mechanism, as proposed by René Girard, also explains the events in Tito Dorčić’s life: the social crisis is seemingly only slightly present, yet Tito is depicted as a person holding a position in the judicial administration which, because of his low intelligence, immorality and lack of cultural refinement, he does not deserve. He commits mistakes in his prosecutor’s work and is punished because an innocent person has been hanged. Tito had previously been marked by the collapse of his marriage. Eventually, he loses his job, falls into madness, which might also be an act of selfpunishment, and at the end, he dies. The text, or the narrator, kills him, in the last step in the long procedure of attacking the protagonist
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