11 research outputs found
Analisis Unjuk Kerja Pompa Sentrifugal dengan Variasi Head
Get PDFPompa Sentrifugal merupakan salah satu jenis pompa yang mempunyai lingkup penggunaan yang sangat luas terkait dengan head dan kapasitas yang dihasilkan. Pada kesempatan ini penulis mencoba memaparkan hasil penelitian tentang unjuk kerja pompa sentrifugal bila dilakukan variasi sudut bukaan katup (valve) pada pompa sentrifugal akan menghasilkan head. Sudut bukaan katup (valve) dimaksudkan untuk mengetahui peningkatan performance pompa yang terjadi akibat pembukaan sudut katup (valve). Menambah bukaan katup (valve) pompa sangat berpengaruh terhadap kapasitas aliran air yang dihasilkan, hal ini juga akan mempengaruhi kerja pompa, kecepatan spesifik, daya dan efesiensi pompa. Sehingga dapat diperoleh titik kerja pompa sentrifugal dengan Kapasitas (Q) 0,000733 m3/s, Head (H) 7,02 m, Daya Hidraulis (Ph) 50,501 watt, Effesiensi (ɳp) 16,396%, hal ini dapat terlaksana bila diikuti penambahan daya dari motor penggeraknya.Centrifugal pump is one type of pump that has a very wide scope of use related to the head and the capacity produced. On this occasion the author tries to explain the results of research on the performance of a centrifugal pump if variations in valve opening angle (valve) on a centrifugal pump will produce a head. The valve opening angle is intended to determine the increase in pump performance due to the opening of the valve angle. Adding to the valve opening (pump) is very influential on the flow capacity of the water produced, this will also affect the work of the pump, specific speed, power and pump efficiency. So that the centrifugal pump working point can be obtained with Capacity (Q) 0,000733 m3 / s, Head (H) 7,02 m, Hydraulics (Ph) 50,501 watts, Efficiency ((p) 16,396%, this can implemented if followed by the addition of power from the driving motor
Analisis Penukar Kalor Tipe Shell Dan Tube Sebagian Pemanas Bahan Bakar Residu (MFO) Pada Unit 3 PLTU PT.PLN (Perseo) Unit Pelaksana Pembangkitan Belawan
Get PDFPompa Sentrifugal merupakan salah satu jenis pompa yang mempunyai lingkup penggunaan yang sangat luas terkait dengan head dan kapasitas yang dihasilkan. Pada kesempatan ini penulis mencoba memaparkan hasil penelitian tentang unjuk kerja pompa sentrifugal bila dilakukan variasi sudut bukaan katup (valve) pada pompa sentrifugal akan menghasilkan head. Sudut bukaan katup (valve) dimaksudkan untuk mengetahui peningkatan performance pompa yang terjadi akibat pembukaan sudut katup (valve). Menambah bukaan katup (valve) pompa sangat berpengaruh terhadap kapasitas aliran air yang dihasilkan, hal ini juga akan mempengaruhi kerja pompa, kecepatan spesifik, daya dan efesiensi pompa. Sehingga dapat diperoleh titik kerja pompa sentrifugal dengan Kapasitas (Q) 0,000733 m3/s, Head (H) 7,02 m, Daya Hidraulis (Ph) 50,501 watt, Effesiensi (ɳp) 16,396%, hal ini dapat terlaksana bila diikuti penambahan daya dari motor penggeraknya.Centrifugal pump is one type of pump that has a very wide scope of use related to the head and the capacity produced. On this occasion the author tries to explain the results of research on the performance of a centrifugal pump if variations in valve opening angle (valve) on a centrifugal pump will produce a head. The valve opening angle is intended to determine the increase in pump performance due to the opening of the valve angle. Adding to the valve opening (pump) is very influential on the flow capacity of the water produced, this will also affect the work of the pump, specific speed, power and pump efficiency. So that the centrifugal pump working point can be obtained with Capacity (Q) 0,000733 m3 / s, Head (H) 7,02 m, Hydraulics (Ph) 50,501 watts, Efficiency ((p) 16,396%, this can implemented if followed by the addition of power from the driving motor
Pra Desain Pabrik Pembuatan Biodiesel Dari Minyak Kelapa Sawit (CPO) Dengan Kapasitas 200.000 Kiloliter/Tahun
No full textPabrik pembuatan biodiesel dilakukan melalui proses esterifikasi dan transestrifikasi. Pabrik biodiesel ini direncanakan untuk berjalan dengan kapasitas 200.000 kiloliter/tahun sepanjang 330 hari per tahun. Pabrik ini diharapkan akan menghasilkan biodiesel untuk memenuhi kebutuhan ekspor dan dalam negeri. Bahan baku yang digunakan dalam pembuatan pabrik biodiesel adalah minyak sawit mentah dan metanol. Pabrik ini direncanakan akan dibangun di Kabupaten Rokan Hulu, Provinsi Riau, untuk memberikan kemudahan terhadap transportasi bahan baku dan produk akhir karena pasar untuk kedua produk sudah tersedia secara lokal. Esterifikasi dan transesterifikasi akan dilakukan pada suhu 60°C dan pada tekanan 1 atm menggunakan reaktor alir tangki berpengaduk dengan tingkat konversi reaksi 93% dan 98%. Dari studi evaluasi ekonomi pabrik ini, disimpulkan bahwa didapatkan penaksiran modal (CAPEX) sebesar Rp. 775.781.414.146,87; biaya operasional (OPEX) sebesar Rp. 2.198.585.382.496. Berdasarkan analisa ekonomi, dapat disimpulkan bahwa pabrik biodiesel dengan kapasitas 200.000 kiloliter/tahun adalah beresiko rendah dan layak secara ekonomis. Berdasarkan kondisi operasi sifat-sifat bahan baku dan produk, pabrik Biodiesel dari Minyak Kelapa Sawit ini tergolong pabrik beresiko rendah. Berdasarkan analisa ekonomi terhadap pabrik ini menunjukkan nilai kekayaan yang dihasilkan (NPV) sebesar Rp 1.154.960.289.580, laju pengembalian modal (IRR) didapatkan sebesar 29% dengan bunga pinjaman 7,95% per tahun. Waktu pengembalian modal (POT) selama 3,74 tahun. Titik impas (BEP) sebesar 23%. Dari data analisa kelayakan di atas disimpulkan bahwa pabrik ini menguntungkan dan layak untuk didirikan.
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The biodiesel production plant is carried out through the esterification and transesterification processes. The biodiesel plant is planned to run with a capacity of 200,000 kiloliters/year for 330 days per year. This plant is expected to produce biodiesel to meet export and domestic needs. The raw materials used in the manufacture of biodiesel plants are crude palm oil and methanol. This factory is planned to be built in Riau Province, to provide convenience for the transportation of raw materials and final products because the market for both products is already available locally. Esterification and transesterification will be carried out at a temperature of 60°C and at a pressure of 1 atm using a stirred tank flow reactor with a reaction conversion rate of 93% and 98%. From this factory economic evaluation study, it was concluded that the estimated capital (CAPEX) was Rp. 775,781,414,146.87; operational costs (OPEX) of Rp. 2,198,585,382,496. Based on the economic analysis, it can be concluded that a biodiesel plant with a capacity of 200,000 kiloliters/year is low risk and economically feasible. Based on the operating conditions and the properties of raw materials and products, this biodiesel plant from Palm Oil is classified as a low-risk factory. Based on the economic analysis of this factory, it shows that the resulting wealth value (NPV) is Rp. 1,154,960,289,580, the rate of return on capital (IRR) is 29% with an interest rate of 7.95% per year. Payback period (POT) for 3.74 years. Break even point (BEP) by 23% From the feasibility analysis data above, it is concluded that this factory is profitable and feasible to establish
Effect of Number of Impeller Blades on Centrifugal Pump Performance
No full text65 HalamanPada kesempatan ini penulis memaparkan hasil penelitian tentang
performance kerja pompa sentrifugal bila dilakukan modifikasi pada impeller
berupa penambahan dan pengurangan jumlah sudu impeller. Untuk membuktikan
hal tersebut penulis melakukan pengujian pompa tanpa modifikasi dengan pompa
penambahan dan pengurangan sudu impeller, pompa yang dimodifikasi adalah
VERO type DB250A impeller tertutup dengan fluida kerja air bersih bersuhu
30°C. On this occasion the author presents the results of research on
working performance of a centrifugal pump if modifications are made to the impeller
in the form of adding and reducing the number of impeller blades. To prove
In this case the author tested the pump without modification to the pump
adding and subtracting impeller blades, the modified pump is
VERO type DB250A closed impeller with working fluid of clean temperature water
30°C
Intellectual property laws and Islam in Malaysia.
No full textPhDThis study is undertaken on the premise that Islam and Islamic law is to be taken into
serious consideration in any future legislative reform of laws in Malaysia. Islam being
the religion of the country and the strong religious sentiment of the Muslims (who
form the majority in Malaysia) cannot be overlooked or dismissed lightly by the
legislators in Malaysia. Reformation of intellectual property laws is timely, as we are
now approaching to the dateline set by GATF-Trips agreement which aim is to
improve our standard of intellectual property protection. This study seeks to analyze
and evaluate the current legislation pertaining to intellectual property in Malaysia in
terms of the philosophy and rules governing the existence, ownership and exercise of
these rights and their consistency and inconsistency with Islam and Islamic law. The
main objective of this study is to prove that a coherent and logical conceptual
framework of ownership of intellectual property can be derived from an Islamic
perspective which not only offers the basis of rights but also defines the scope of
these rights. From the point of ownership of rights, support can be obtained from the
normative framework of property rights within the traditional classification of 'mal'
(property) and 'haqq al-milkiyyah' (ownership rights) under Islamic law. From the
point of exercise of rights, the exact scope can be defined from the analysis of
fundamental concepts which have been developed by Muslim jurists. It has been
established that Islam and Islamic law offers a sound and systematic paradigm, which
in deeper analysis, can satisfy both our current obligations under international
treatises, as well as our responsibility to practise our religion to the fullest
Implementasi Load Balancing Web Server dan Basis Data Terdistribusi MySQL Cluster pada Perangkat Lunak eReview: Marketplace untuk Sistem Telaah Artikel Ilmiah
No full textDalam melakukan publikasi sebuah artikel ilmiah diperlukan beberapa tahapan. Dimulai dari penulis mengunggah draf artikel ilmiah pada sebuah jurnal, editor meminta artikel ditelaah kepada penelaah, serta proses pengeditan dan publikasi apabila draf dinyatakan lolos proses telaah. Terdapat sistem bernama eReview yang mengadopsi proses publikasi artikel ilmiah menjadi sebuah marketplace. Sistem ini memudahkan editor untuk mendapatkan penelaah yang sesuai dengan topik dari draf artikel ilmiah. Namun, banyaknya kebutuhan publikasi artikel, maka sistem eReview yang hanya menggunakan satu server web dan satu server basis data membutuhkan kinerja server web yang dapat memberikan respons dengan beban permintaan yang tinggi serta basis data yang cepat dalam memproses jumlah data yang banyak. Oleh karena itu, penelitian ini akan mengimplementasikan penyeimbang beban di server web menggunakan Amazon ELB tipe Application Load Balancer dan basis data terdistribusi MySQL Cluster dengan HAProxy. Penyeimbang beban akan menerapkan algoritma Least Connection dengan beban permintaan didistribusikan pada beberapa jalur koneksi server secara seimbang. Adapun MySQL Cluster menerapkan klaster pada basis data dengan menggunakan arsitektur Shared Nothing Cluster. MySQL Cluster memiliki keunggulan dalam ketersediaan tinggi dan skalabilitas. Implementasi server web dengan penyeimbang beban akan dibandingkan dengan penggunaan satu server web tanpa penyeimbang beban berdasarkan jumlah sampel, rata-rata waktu respons, dan throughput dari pengujian performa jenis load dan spike dengan JMeter. Begitu juga, MySQL Cluster dengan HAProxy akan dibandingkan dengan MySQL Cluster tanpa HAProxy dan MySQL Server menggunakan pengujian operasi basis data delete, insert, select, dan update dengan membandingkan jumlah transaksi menggunakan Sysbench. Selain itu, juga diuji terkait implementasi Amazon S3 sebagai tempat penyimpanan file di sistem eReview untuk menghindari terjadinya kegagalan dalam menampilkan file karena disimpan di lokal penyimpanan server web dengan menguji secara otomatis menggunakan dua skenario yang menjalankan proses penyimpanan dan menampilkan file di sistem eReview melalui Amazon S3. Berdasarkan hasil percobaan, Sistem eReview mengalami peningkatan performa dalam merespons permintaan dan memproses data. Dalam segi merespons permintaan dibuktikan dengan nilai APDEX yang meningkat sebesar 6% dan 9% pada Skenario 1. Dalam segi memproses data untuk operasi basis data delete, insert¸ dan update non index dengan thread 256 dan 512, masing-masing operasi mengalami peningkatan 2% dan 9%, 13% dan 37%, serta 48% dan 90% dari jumlah transaksi MySQL Server. Pada pengujian otomatis penyimpanan dan menampilkan file, kedua skenario berhasil menyimpan dan menampilkan file di Amazon S3.
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In the publication of scientific articles there are several stages. Starting with the author uploading a draft of a scientific article to a journal, the editor asks the reviewer to review the article, as well as the editing and publication process if the draft is declared to have passed the review process. There is a system called eReview that adopts the process of publishing scientific articles in a marketplace. This system makes it easy for editors to get reviewers who are familiar with the topic of scientific article drafts. However, due to the large number of needs for article publication, the eReview system, which only uses one web server and one database server, requires a web server that can respond to high demand loads and a fast database that can process large amounts of data. Therefore, this research will implement a load balancer on a web server using an Amazon ELB of the Application Load Balancer type and a MySQL Cluster distributed database with HAProxy. The load balancer will apply the Least Connection algorithm with the request load distributed over several server connection lines in a balanced way. The MySQL Cluster implements a cluster on the database using the Shared Nothing Cluster architecture. MySQL Cluster has advantages in high availability and scalability. Implementation of a web server with a load balancer will be compared to using a web server without a load balancer based on the number of samples, average response time, and throughput of the load and spike-type performance tests with JMeter. Likewise, MySQL Cluster with HAProxy will be compared with MySQL Cluster without HAProxy and MySQL Server using delete, insert, select, and update database operation tests by comparing the number of transactions using Sysbench. In addition, it was also tested regarding the implementation of Amazon S3 as a place to store files in the eReview system to avoid failures in displaying files because they are stored in local web server storage by testing automatically using two scenarios that run the process of storing and displaying files in the eReview system through Amazon S3. Based on the experimental results, the eReview System has experienced increased performance in responding to requests and processing data. In terms of responding to requests, it is proven by the APDEX values, which increased by 6% and 9% in Scenario 1. In terms of data processing for delete, insert, and non-index updates with threads 256 and 512, each operation experienced an increase of 2% and 9%, 13% and 37%, as well as 48% and 90% of the number of MySQL Server transactions. In the automated test of saving and displaying files, both scenarios were successful in storing and displaying files in Amazon S3
The Influence of the Russian and Ukraine Conflict on Indonesian Economic Development Review of Theotonio Dos Santos Theory (Dependency Theory)
No full textFebruary 24, 2022 Russia begins its invasion of Ukraine. The situation and condition of countries in the world that have just started to recover from being hit by COVID-19, are actually made to worry again due to the Russian invasion of Ukraine. The implications that are felt are quite painful, especially in the economic field. The world economic situation will weaken in line with rising commodity prices, especially in the economic and food sectors due to the conflict. Indonesia is a country that is active in trade transactions both export and import activities will certainly feel the impact of this conflict. In this study, the author places the formulation of the problem, namely how the influence of the Russian-Ukrainian conflict on Indonesia's economic development in terms of dependency theory. Then, this research uses the type of research that is carried out by normative research and uses the type of theoretical research (theoretical research). In the conflict between Russia and Ukraine, Indonesia was quite firm in stating its position as a "free and active" country, which is an advantage for Indonesia to be able to continue to carry out investment activities and export transactions with other countries, including countries involved in the conflict. so that the Indonesian economy continues to grow even in unsafe conditions and situations. But on the other hand, it must be remembered that Indonesia is a developing country that still carries the status of a country that depends on developed countries. So, when the economies of developed countries weaken such as the United States, China, and Russia for example, then Indonesia will feel the same way, the Indonesian economy will also be affected by this. This is the description of the dependency theory explanation put forward by Theotonio Dos Santos
Flexural properties untreated and treated kenaf fiber reinforced polypropylene composites
No full textPRODUK PEMIKIRAN HUKUM ISLAM DI INDONESIA KONTEKSTUALISASI SYARIAT DALAM REALITAS SOSIAL DAN BUDAYA
No full textIslamic law in its history, was applied in the first year of the hijri in Medina by the Prophet Muhammad (peace be upon him), on the basis of the constitution of the Charter of Medina. In the muqaddimah it is written, that the Charter of Medina is a product of Islamic legal thought, if reviewed from the social history of Islamic law, then its growth and development began from the time of the Prophet (peace be upon him) until now, the change in Islamic law is also influenced by the progress and plurality of socio-cultural and political in a society. In this study, the author uses the Library Research method, which contains theories that are related to research problems. The result of this research is that Islamic Law in Indonesia has become an institutionalized institution including jurisprudence, fatwa, jurisprudence, and laws where its formation is a process of contextualization that is closely related to the social dynamics and local wisdom of Indonesian society. Following the methodological tradition of classical mujtahid scholars, this legal product consistently integrates local cultural values; Local wisdom is even recognized as a binding order. This makes Indonesian Islamic law, especially on the issue of marriage and inheritance, adaptive and responsive, showing a deep appreciation for the social development of the community over time
Gastroesophageal reflux disease in an area with low Helicobacter pylori infection prevalence
Get PDFThe association between gastroesophageal reflux disease (GERD) prevalence and its risk factors in an area with low Helicobacter pylori prevalence is important to clarify. We analyzed the prevalence of GERD and risk factors in an area of Indonesia with low prevalence of H. pylori infection. We recruited 104 dyspeptic patients who underwent endoscopy in Surabaya. Patients were diagnosed with GERD based on the Los Angeles classification. We evaluated gastric biopsy specimens and measured serum pepsinogen levels. Interleukin polymorphisms were evaluated by polymerase chain reaction-restriction fragment length polymorphism. Of 104 patients, 56 (53.8) were endoscopically found to have GERD, with most categorized as grade A; 48 (46.2) were classified as non-GERD. Higher economic status, smoking, and a history of proton-pump inhibitor use significantly increased the risk of GERD. GERD Questionnaire scores showed a positive correlation with GERD (P < 0.001). An association was found between antral atrophic gastritis and GERD (P = 0.030), and patients with GERD more frequently had severe antral atrophy than nonerosive reflux disease (P = 0.018). We found an association between pepsinogen I/II levels and GERD (P = 0.047), but with low accuracy. IL-1β -511 TT and CT were predominant among the IL-1β -511 genotypes, and IL-8-251 AT and TT were predominant among the IL-8-251 genotypes. In conclusion, we found a high prevalence of GERD in an area with low prevalence of H. pylori infection, which could be associated with acid reflux. Smoking, history of proton-pump inhibitor use, and higher economic group significantly increased the risk of GERD. Copyright: © 2018 Miftahussurur et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
