Comparative Performance of a Powerplus Vane-type Supercharger and an N.A.C.A. Roots-type Supercharger

This report presents the results of tests of a Power plus supercharger and a comparison of its performance with the performance previously obtained with an N.A.C.A. Roots-type supercharger. The Powerplus supercharger is a positive displacement blower of the vane type having mechanically operated vanes, the movement of which is controlled by slots and eccentrics. The supercharger was tested at a range of pressure differences from 0 to 15 inches of mercury and at speeds from 500 to 2,500 r.p.m. The pressure difference across the supercharger was obtained by throttling the intake of a depression tank which was interposed in the air duct between the supercharger and the Durley orifice box used for measuring the air. The results of these tests show that at low pressure differences and at all speeds the power required by the Powerplus supercharger to compress a definite quantity of air per second is considerably higher than that required by the Roots. At pressure differences from 10 to 14 inches of mercury and at speeds over 2,000 r.p.m. the power requirements of the two superchargers are practically the same. At a pressure difference of 15 inches of mercury or greater and at a speed of 2,500 r.p.m. or greater the performance of the Powerplus supercharger is slightly better than that of the Roots. Because the Powerplus supercharger cannot be operated at a speed greater than 3,000 r.p.m. as compared with 7,000 r.p.m. for the Roots, its capacity is approximately one-half that of the Roots for the same bulk. The Powerplus supercharger is more complicated and less reliable than the Roots supercharger

Inventarisasi Arecaceae Di Kawasan Wisata Air Terjun Irenggolo Kediri

-Arecaceae is a monocot that grows in parts of the world from the tropics and sub-tropics, lowlands to highlands, on the mountains and the shore, in the lush and barren land. From the 215 genus of Arecaceae, the 46 genus is growing in Indonesia and 29 of them is endemic plant. Lately, Aracaceae research related to rare, whereas the benefits of it is good among other for drugs, cosmetics, building materials, and others. The study aims to determine the species of Arecaceae in the waterfall region of Irenggolo Kediri. Descriptive study was conducted with the observation and literature review technique. Samples were taken with a random roaming method which is divided into four zones according to the height of land. The Arecaceae found in Irenggolo waterfall Kediri as many as of six species, namely A. pinnata, P. roconata, Daemonorops sp., Calamus unifarius, Calamus sp., S. Zalampaicc

Study of composition of Missouri grown roughages

This bulletin is a report on Department of Dairy Husbandry research project No. 139, entitled 'Nutritional Studies on Growth and Milk Production'--P. [2].Digitized 2007 AES.Includes bibliographical references (pages 46-51)

Analisis Biaya Diferensial dalam Pengambilan Keputusan Membeli Atau Memproduksi Sendiri Bahan Baku Daging Ayam Olahan pada Ud. Adi Paslah Manado

Pengambilan keputusan memerlukan biaya, seperti biaya diferensial atau biaya incremental yang adalah menentukan perbandingan dari dua alternatif. Analisis biaya diferensial juga membantu pengambilan keputusan, yaitu apakah membeli atau memproduksi sendiri, menolak atau menerima pesanan, dan menaikan atau menurunkan volume operasi. Tujuan penelitian ini untuk mengetahui apakah analisis biaya diferensial dalam keputusan membeli atau memproduksi sendiri untuk meningkatkan laba pada UD. Adi Paslah. Penelitian ini digunakan metode penelitian deskriptif, untuk menguji hipotesis atau menjawab pertanyaan penelitian. Penggunaan informasi biaya diferensial membantu pengambil keputusan untuk memutuskan membeli dari luar daerah karena pendapatan diferensial lebih besar dari biaya diferensial dan dapat meningkatkan laba. Sebaiknya pimpinan Perusahaan, membeli bahan baku daging olahan dari luar daerah karena lebih menguntungkan dan menghemat biaya. Kata kunci: biaya diferensial, membeli, memproduksi sendiri, lab

To Fulfil Promises is To Die: A Study of Gatotkaca Falls in Javanese Shadow Puppet Canon

Bharatayudha is the main source in wayang (shadow puppet) performances. This is very interesting to study because the events of the war which in Indian stories are very cruel, sadistic, after becoming a puppet show are very different. The hero or importans figures death is not caused by the violence of the weapon, but by someones promise. This study aims to understand the bharatayudha war in Javanese society. Data was collected by observing the performance of the play Gatutkaca Fall staged by a famous puppeteer, Manteb Sudarsono. This study uses qualitative methods to present data descriptively using a critical discourse analysis (CDA) approach. This research shows that the bharatayudha war according to Javanese society is not understood as a physical war, but as a means of fulfilling the promises of heroes or important figures. Gatutkacas death was not due to the effectiveness of Karnas Kuntawijayadanu weapon, but because of a promise made by Kalabendana, ie Gatutkacas uncle. This study suggests further research on other Bharatayudha serial plays and other puppeteers to get a more comprehensive picture of the Baratayudha play in wayang performances

Identifikasi Faktor-Faktor Penumpukan Realisasi Anggaran Belanja Di Akhir Tahun (Studi Kasus Pada Balai Penelitian Dan Pengembangan Lingkungan Hidup Dan Kehutanan Manado)

. Implementation of the budget is a very important stage in the realization of government programs that have been organized in the National budget. The implementation sometime found difficulties, including the realization of the budget tends to be low in the early years and accumulated at the end of the year. According to Rusqiayati (2014), ideally the realization of the government\u27s budget follows the "S-curve" which is tends to be stable at the beginning of the year, then increased in the mid and stabilized towards the end of the fiscal year. This research aims to identify factors that causing the accumutaed of budget realization in the end of the year at Environment and Forestry Research and Development Institute of Manado. This study is a qualitative case study. The key informants in this research are officers or employees directly involved in financial management, such as the Budget Authority (KPA), Committing Officer (CO), official signing of Warrant Pay (PPSPM), Treasurer, Assistant Treasurer, and Executive Technical Officer ( PTK).The results showed that factors that causing the accumulated of budget realization in the end of the year at Environment and Forestry Research and Development Institute of Manado were budget planning, budget execution, procurement of goods/services, and human resources

Performance of Air-cooled Engine Cylinders Using Blower Cooling

An investigation was made to obtain information on the minimum quantity of air and power required to cool conventional air cooled cylinders at various operating conditions when using a blower. The results of these tests show that the minimum power required for satisfactory cooling with an overall blower efficiency of 100 percent varied from 2 to 6 percent of the engine power depending on the operating conditions. The shape of the jacket had a large effect on the cylinder temperatures. Increasing the air speed over the front of the cylinder by keeping the greater part of the circumference of the cylinder covered by the jacket reduced the temperatures over the entire cylinder

The Performance of a Depalma Roots-type Supercharger

The results of tests made to determine the performance of a DePalma-Roots supercharger are presented. The performance of the DePalma supercharger with atmospheric pressure at the discharge was compared with that of a hypothetical NACA Roots-type supercharger of the same displacement. The tests were conducted at speeds from 1,000 to 6,000 r.p.m. and at pressure differences from 0 to 15 inches of mercury. The variation in clearance between the impeller tips and the impeller housing was determined for the DePalma supercharger at a speed of 2,000 r.p.m. and for the NACA supercharger at speeds from 500 to 3,000 r.p.m. with the pressure differences for each supercharger varying form 0 to 15 inches of mercury. The results indicate that, if warping and growing of the metals of the case and impellers are neglected, the most uniform clearances can probably be maintained for all operating conditions when the case and impellers are constructed of metals that have the same coefficient of expansion. The results also show that the discharge and intake openings of this model of the DePalma supercharger are too small, which lowers the volumetric efficiency and impairs the performance at all speeds and pressure differences. At high pressure difference the volumetric efficiency of the DePalma supercharger is greater when the discharge pressure surpasses atmospheric pressure than when the discharge pressure is atmospheric