Pengaruh Rapat Arus Anodizing terhadap Nilai Kekerasan pada Plat Aluminium Paduan Aa Seri 2024-t3

Aluminum alloy AA 2024-T3 is widely applied in the aircraft industry because it has good mechanical properties such as; light weight, good conductivity and the corrosion resistance. However Aluminium 2024-T3 susceptible to wearing. One method to improve the wear resistance o f AA 2024-T3 is the anodizing process. The aims of this research to study the effect of current density and anodizing time against the hardness of aluminum alloy AA 2024-T3. The process of anodizing was carried out using 10 percent sulfuric acid solution with the current density of 1.5 Ampere per decimeters square, 3.0 Ampere per decimeters square and 4.5 Ampere per decimeters square with immersion times of 30, 40, 50 and 60 minutes. Furthermore, the surface hardness was measured by using the Vickers hardness test method. As the supporting data the composition of the test conducted, testing the microstructure, and vickers hardness test. This study shows that the surface hardness of aluminum alloy AA 2024-T3 is influenced by the current density and anodizing time with varying values. Its shows that higher current density o f the anodizing caused optimal time tends to be short. The longer anodising time it will produce greater layer of aluminum oxide

Studi Komparasi Pengaruh Variasi Arus Pengelasan terhadap Kekuatan Impak, Kekerasan, dan Struktur Mikro Sambungan Las Pegas Daun Baja Sup 9 pada Proses Las Smaw

Spring is a component that functions to receive dynamic load and providescomfort in driving. The problem is the leaf spring is sometimes broken due to theoverload or unfavorable road conditions. The solution for that problem is grafting using the SMAW welding.This study aims to determine the effect of variations in the welding currentto the impact strength, hardness and microstructure. Types of weld used is SMAW with a variety of welding current of 100 A, 120 A and 140 A and the type of seam used is the type of seam V.The highest impact strength test was 1.698 j/mm2at 100 A and the highest hardness test was 355.338 HVN at 140 A. In addition, the micro structure at the welding area has bigger grain size and more pearlite structure at 140 A

Perlindungan Hukum Bagi Pembeli Terhadap Jual Beli Hak Atas Tanah Yang Dilakukan Secara Di Bawah Tangan (Studi Kasus Di Kota Malang)

Legal institutions known as Customary Law are generally institutions required to meet the needs of people who are still antiquated, so in order to meet modern society need, the institution of the sale and purchase of land rights for example, undergoes modernization and adjustment, without changing the essence as legal act of buying and selling land rights to the payment of the price in cash, and the nature and character as a real deeds and clear. A change which aims to improve the quality of evidence in legal actions carried out according to customary law public limited personal and territorial scope, the seller itself simply made the deed and is known by the Village Head. Average selling rights to land according to Regulation No. 24 of 1997 shall be evidenced by a deed made by a PPAT. Changes in this procedure does not negate the provisions of customary law governing the institution in terms of material and selling land rights. But people still buy and sell land rights under hand. One example of the results of the study authors found cases of buying and selling land rights conducted under the hand of the study sites namely residential areas in the village area Madyopuro Kedungkandang subdistrict, Malang. Sale and purchase of land rights are carried out under the hand has problems, especially for buyers who will make the process to change the name of the certificate to be registered to the Land Office of Malang. Therefore, if the sale and purchase of land rights is conducted under the hand, it can not be registered at the Land Office of Malang to be processed to change the name in the certificate. Research conducted in this thesis is an empirical study using sociological juridical approach. Based on these results above regarding legal protection for the buyer to do a sale and purchase of land rights under hand it can be concluded (1) the buyer does not get the legal protection of land he had bought; (2) the buyer does not obtain legal certainty on the land he had bought; (3) the buyer does not get strong evidence right on land bought. This of course would be detrimental to the buyer who purchases land rights committed under hand. This event is expected to bring to the community, especially for the buyers when buying and selling land rights should be conducted in the presence of PPAT so get protection and legal certainty of land bought

Analisis Faktor- Faktor yang Mempengaruhi Struktur Modal (Studi Empiris pada Perusahaan Pertambangan yang Listing di Bei Tahun 2010-2013)

This research is aimed to analyze the factors that affect the capital structure on a mining company listed on the Indonesia Stock Exchange. The sample of this research is a mining company that is listed on the Indonesia Stock Exchange in the year 2010-2013. The population of this research are 36 by using purposive sampling method companies. These datas were analyzed using multiple regression analysis model, which is preceded by the classical assumption that consists of normality test, heteroscedasticity, multicollinearity and autocorrelation test. Hypothesis testing is done by using the F test and t test. The results of this research indicate that profitability, and business risks have a significant effect the company's capital structure. While the asset structure, ownership structure, company size, sales growth and the tax rate does not have a significant effect on the Capital structure

Administration Inventory System Drugs on Chemical Pharmacies Farma (Persero)

In today\u27s era of globalization of the world to simplify and speed up a job that can produce accurate information is required. Indispensable role in solving computer-related work with a variety of data storage and updating of existing data. Apotek Kimia Farma (Persero) Tbk No. 47 is a company engaged in the sale, compounding, and processing of drugs and health equipment. The company is developing in line with the increasing demand from consumers, clinics, hospitals and physicians have subscribed. Pharmacy is also a certain place, where do the work of pharmacy and distribution of pharmaceutical supplies to the public. Our society is a decade ahead in dealing with health conditions are still expected to focus efforts on prevention rather than treatment. For that Kimia Farma Apotek (Persero) Tbk No. 47 tried to assess the pharmacy business as part of integrated community health service. In conducting its activities in sales administration, purchasing administration, and administration of inventories still use manual way, it often causes delays in the process of service, inventory reports and other reports. Besides the difficulty to find medical supplies often experience an imbalance between the administrative record with the actual physical record that because of limited manpower. In improving the system is computerized drug inventory system, in order to produce information quickly, precisely and accurately, thus helping in the decision making process, overcoming the delayed process of achieving efficiency and effectiveness

The Effect of Organic Sediment Content on Coral Diversity in Karimunjawa Island, Indonesia

Coral reef now are under threats due to sedimentation. Fatal effect of organic rich sediment, leading corals mortality. Therefore, the study was conducted to investigate effect of organic sediment content to the coral diversity in Karimunjawa Island, Central Java, Indonesia. Field data was conducted at 6 locations. Three sediment traps were deployed at each sites to measure organic sediment content. Twenty replicated quadrant transects were used to estimate coral density and coral diversity. Analysis of variance (ANOVA) was used to examine the differences of organic sediment content in each station. The linear regression was used to assess the relationship between organic sediment content and coral diversity. Our field result demonstrated that sediment content significantly different between sites with value range from 0.42 mg/800 ml - 1.32 mg/800 ml. Based on the Simson\u27s Diversity Index, the highest coral diversity found at Alang-alang as site with low sedimentation while the lowest coral diversity was found at Legon Lele as site with high sedimentation. The study shown significant negative correlation between organic sediment content and coral diversity with the coefficient of regression 0.68. This study convinces that disturbance on coral reefs might affect coral diversity in Karimunjawa Island, in addition to other factors such as the influence of human activities, natural disruption and climate change