21,473 research outputs found
Analisis Kapasitas Saluran Daerah Irigasi Lubuk Buntak Kecamatan Dempo Selatan Kota Pagar Alam
No full textBuilders in this irrigation area are a great opportunity to improve the economy of the community Lubuk Buntak. In order to improve and maintain agricultural production of food crops, the Pagar Alam City Government has until now built irrigation facilities and infrastructure both for the construction of new irrigation or rehabilitation in order to support the planned food security program. Irrigation channels located in the Lubuk Buntak irrigation area during the rainy season the water found on the irrigation canal has exceeded the capacity of the irrigation channel so that the irrigation can not work optimally, due to the high rainfall that occurs Thus the irrigation of Lubuk Buntak City Pagaralam irrigation area needs to be analyzed for the rainfall that occurs, in order to determine the ideal irrigation canal design and in accordance with the magnitude of the planned flood discharge, so that the planned irigassi channel works optimally. The purpose of this survey is about Rainfall Analysis, Calculation of planned flood discharge, Irrigation Channel Dimension, in this thesis using five Smirnov-Kolmogorov matching medotas from the calculation of the suitability of the method used is the gumbel method because the maximum difference (Dmax) -4, 70 <from Critical Value 41% (0.41), and analyze flowrate, so that the Irrigation Channel remains optimal for water resources can be utilized according to its designation, based on the parameters obtained. Next, identify the irrigation channel, calculate the intensity of rainfall, determine the flood discharge and the last design the channel dimensions for the area. The research carried out with a land area of 50 ha was obtained by the value of the intensity of the 50-year return rainfall of 530.76 m3 / sec, the planned flood return period of 50 years was 1.48 m3 / sec and the design of the channel dimension was (h) = 1, 42 m (B) = 1.40 m, (wf) = 0.29 m, and (TMA) = 1.17
Efficient light focusing through tunable spiralized Fresnel zone plate
No full textHere we present a structure based on a tunable spiralized Fresnel zone plate, engineered to turn dark zones into additional emission zones by properly rephasing the crossing light. The choice of a suitable configuration allows us to reduce the inherent linear anisotropy related to wire structures. The spiral design permits us to sweep the focus point along the three orthogonal coordinate directions and also provides some degree of frequency tunability, all desirable characteristics for modern applications of this type of lenses, such as modern micro-lensing
devices
ANALISA KADAR LOGAM TIMBAL (Pb) PADA BEBERAPA MADU ALAM
No full textTelah dilakukan analisa kadar logam timbal (Pb) pada beberapa madu alam, Madu yaitu madu yang berasal dari Kebun Raya Samarinda (KRUS), madu Sulawesi dan madu yang berasal dari budidaya di Fakultas Matematika dan Ilmu Pengetahuan Universitas Mulawarman. Preparasi sampel didestruksi basah dengan wet digester menggunakan kombinasi HNO3(P) - H2O2(P). Hasil penelitian menunjukan adanya kadar logam berat timbal (Pb) pada madu alam ; untuk sampel A (Kebun Raya Universitas Mulawarman Samarinda) sebesar 0.0767 mg/kg, untuk sampel B (Fakultas Matematika dan Ilmu Pengetahuan Universitas Mulawarman Samarinda) sebesar 1.0867 mg/kg dan sampel C (madu alam Sulawesi) sebesar 1.6667 mg/kg. Dengan demikian, madu alam tersebut masih dalam ambang batas diperbolehkannya kandungan Pb dalam makanan yang ditetapkan oleh BSN. 2009. SNI 7387: 2009 yakni sebesar 2,0 mg/kg. Dari hasil proses analisis Pb pada madu tidak memerlukan penambahan standar adisi pada metode pendekteksiannya.
Kata kunci : Lebah tanpa sengat (Trigona Spp), Timbal (Pb), Madu, Destruksi Basah
Direct numerical simulation of 'short' laminar separation bubbles with turbulent reattachment
No full textDirect numerical simulation of the incompressible Navier–Stokes equations is used to study flows where laminar boundary-layer separation is followed by turbulent reattachment forming a closed region known as a laminar separation bubble. In the simulations a laminar boundary layer is forced to separate by the action of a suction profile applied as the upper boundary condition. The separated shear layer undergoes transition via oblique modes and [Lambda]-vortex-induced breakdown and reattaches as turbulent flow, slowly recovering to an equilibrium turbulent boundary layer. Compared with classical experiments the computed bubbles may be classified as ‘short’, as the external potential flow is only affected in the immediate vicinity of the bubble. Near reattachment budgets of turbulence kinetic energy are dominated by turbulence events away from the wall. Characteristics of near-wall turbulence only develop several bubble lengths downstream of reattachment. Comparisons are made with two-dimensional simulations which fail to capture many of the detailed features of the full three-dimensional simulations. Stability characteristics of mean flow profiles are computed in the separated flow region for a family of velocity profiles generated using simulation data. Absolute instability is shown to require reverse flows of the order of 15–20%. The three-dimensional bubbles with turbulent reattachment have maximum reverse flows of less than 8% and it is concluded that for these bubbles the basic instability is convective in nature
Rancang Bangun Sewa Kontrak Kios Pasar Dempo Permai Kota Pagar Alam Berbasis Web
No full textCurrently the progress of Information and Communication Technology has been adapted by various government agencies or private, one of the technology that can be used is web, government have used this technology for e-government. The Office of Industry, Trade and SME of Kota Pagar Alam that runs the Market through the Technical Implementation Unit of the Service gives the right to rent at Pasar Dempo Pagar Alam. During this time if there is an empty kiosk, prospective tenants come to the clerk for confirmation and lease submission process. To simplify the management and lease submission process, an application is needed that can facilitate the officer and prospective tenants to interact, while the application will be built is web-based. The purpose of this study design application in the sense of translating the results of the analysis into the form of software packages later Create the system or improve the existing system. To make the proposed system the author uses the steps of Customer Communication, planning, modeling, construction and deployment
Ultra-broadband wavelength conversion based on four-wave mixing in a Raman DFB fiber laser
No full textWe report highly efficient four-wave mixing (FWM) within a 30cm-long centre pi phase-shifted Raman DFB fiber laser with a continuous frequency tuning range of ~19.9 THz with the FWM conversion efficiency up to -25dB
A Sustainable Campus for Higher Education Institutions in the US
No full textThe green and sustainable campus as a concept is not something new to the US However, well organized and coherent activities to effectively "green" campues are not that common, and efforts are minor in comparison tothe potential of these universities (green and tompson, 2005)This poster was presented by Alam, Md Imtiajul A Sustainable Campus for Higher Education Institutions in the US. at the 5th Graduate and Professional Student Research Conference April 11, 2018, Memorial Union, Iowa State University, Ames, Iowa. Posted with permission
Studi Adsorpsi Rhodamin B Oleh Zeolit Alam Hasil Aktivasi Asam
No full textKajian adsorpsi rhodamin B dengan adsorben zeolit alam hasil aktivasi asam telah dilakukan dengan tujuan untuk mempelajari pengaruh kondisi adsorpsi (pH, waktu kesetimbangan, kecepatan pengocokan dan konsentrasi rhodamin B) terhadap adsorpsi rhodamin B oleh zeolit alam hasil aktivasi asam serta menentukan kondisi optimum adsorpsi. Kondisi aktivasi dilakukan pada 2 gram zeolit alam, menggunakan 50 mL HCl 0,4 M pada lama pengocokan 4 jam dan kecepatan pengocokan 100 rpm. Kondisi adsorpsi dilakukan menggunakan 0,1 gram zeolit alam hasil aktivasi asam dan 25 mL larutan rhodamin B 25 ppm dengan variasi pH 1-13, waktu pengocokan 1, 2, 3, 4, 5 jam, kecepatan pengocokan 100, 125, 150, 175, 200 rpm dan konsentrasi rhodamin B 5, 10, 15, 20, 25, 30, 35, 40 ppm. Konsentrasi sisa rhodamin B ditentukan secara spektrofotometri sinar tampak. Hasil penelitian menunjukkan bahwa kondisi adsorpsi berpengaruh terhadap nilai adsorpsi dengan kondisi optimum dicapai pada pH 2, waktu pengocokan 4 jam, kecepatan pengocokan 150 rpm dan konsentrasi rhodamin B 40 ppm dengan nilai adsorpsi 98,96 ± 0,15% dan kapasitas adsorpsi 9,90 ± 0,02 mg/g
Kajian Adsorpsi Rhodamin B pada Zeolit Alam Termodifikasi
No full textABSTRAK
Telah dilakukan kajian adsorpsi rhodamin B pada zeolit alam termodifikasi, rhodamin B sebagai adsorbat dan zeolit alam Malang yang dimodifikasi surfaktan CTAB (cetiltrymethilammonium bromide) sebagai adsorben. Zeolit merupakan mineral yang tersusun dari kerangka silika-alumina tetrahedral secara tiga dimensi. Untuk meningkatkan daya adsorpsi terhadap zeolit alam Malang, maka dalam penelitian ini dilakukan modifikasi permukaan zeolit dengan surfaktan CTAB. Penelitian ini bertujuan untuk mengetahui pengaruh lama pengocokan dan konsentrasi CTAB pada proses modifikasi zeolit alam terhadap adsorpsi rhodamin B.
Adsorpsi rhodamin B pada zeolit alam termodifikasi dilakukan dengan cara melakukan variasi lama pengocokan 10, 20, 30, 40, 50 dan 60 menit dan variasi konsentrasi surfaktan CTAB pada proses modifikasi, yaitu 0,25; 0,50; 0,75 dan 1 mM pada pH 2. Karakterisasi yang digunakan meliputi karakterisasi dengan XRD (X-Ray Difraction) untuk mengetahui jenis kristal dari zeolit alam Malang, dan karakterisasi dengan FTIR (Fourier Transform Infra Red) untuk mengetahui keberadaan CTAB pada zeolit alam termodifikasi.
Hasil penelitian menunjukkan bahwa pada variasi lama pengocokan adsorpsi, semakin lama pengocokan dari 10 sampai 60 menit semakin banyak jumlah rhodamin B yang teradsorpsi. Diperoleh lama pengocokan terbaik adsorpsi, yaitu pada menit ke-60 yang mempunyai daya adsorpsi sebesar 9,439 mg/g untuk zeolit alam; 8,954 mg/g untuk zeolit-CTAB 0,25 mM; 7,946 mg/g untuk zeolit-CTAB 0,50 mM; 8,220 mg/g untuk zeolit-CTAB 0,75 mM dan 7,894 mg/g untuk zeolit-CTAB 1 mM. Variasi konsentrasi surfaktan CTAB 0; 0,25; 0,50; 0,75 dan 1 mM pada proses modifikasi zeolit alam, menunjukkan bahwa semakin besar konsentrasi surfaktan CTAB, maka daya adsorpsi dari zeolit alam termodifikasi relatif semakin kecil. Jenis kristal dari zeolit alam Malang yaitu, mordenite dan pita serapan yang menunjukkan bahwa zeolit telah dimodifikasi dengan CTAB adalah pada daerah 2925,110 cm-1 dan 2855,310 cm-1 yang merupakan regangan simetris dan asimetris gugus CH3-R.
ABSTRACT
Has done research about study of adsorption rhodamine B on modified natural zeolite, rhodamine B as the adsorbate and the natural zeolite of Malang are modified by the surfactant CTAB (cetiltrymethilammonium bromide) as an adsorbent. Zeolite is a mineral composed of silica-alumina tetrahedral framework in three dimensions. To enhance the adsorption on natural zeolite Malang, then in this research zeolite surface modification with CTAB surfactant. This study aims to determine the effect of agitation time and concentration of CTAB on the adsorption rhodamine B on modified natural zeolite.
Rhodamine B adsorption on modified natural zeolite by performing a variation of agitation time 10, 20, 30, 40, 50 and 60 minutes and the variation of the concentration of surfactant CTAB in the modification process, 0,25; 0,50; 0,75 and 1 mM in pH 2. Characterization used include characterization by XRD (X- Ray Difraction) to determine the type of crystals of natural zeolite Malang, and characterization by FTIR (Fourier Transform Infra Red) to determine the presence of CTAB on modified natural zeolite.
The results showed that the variation of adsorption agitation time, the longer the agitation, which was from 10 to 60 minutes more the number of rhodamine B adsorbed. Obtained the best long agitation of the adsorption, in the 60 minute having adsorp power of 9,439 mg/g for natural zeolite; 8,954 mg/g for zeolite-CTAB 0,25 mM; 7,946 mg/g for zeolite-CTAB 0,50 mM; 8,220 mg/g for zeolite-CTAB 0,75 mM and 7,894 mg/g for zeolite-1 mM CTAB. Variation of the concentration of surfactant CTAB 0; 0,25; 0,50; 0,75 and 1 mM in the process of modification of natural zeolites, can not find the optimum concentration of surfactant CTAB, but it can only be said that the greater the concentration of the surfactant CTAB, the power of modified natural zeolite adsorp relatively smaller. Types of crystals of natural zeolite mordenite and absorption band indicating that the zeolite has been modified with CTAB is the area of 2925,110 cm-1 and 2855,310 cm-1 which is a vibrations symmetric and asymmetric CH3-R group
Recommendation domains for pond aquaculture: country case study: development and status of freshwater aquaculture in Bangladesh
No full textThis report is an output of the project ôDetermination of high-potential aquaculture development areas and impact in Africa and Asiaö. This monograph is the case study for Bangladesh. Written in three parts, it describes the historical background, practices, stakeholder profiles, production levels, economic and institutional environment, policy issues, and prospects for aquaculture in the country. First, it documents the history and current status of the aquaculture in the country. Second, it assesses the technologies and approaches that either succeeded or failed to foster aquaculture development and discusses why. Third, it identifies the key reasons for aquaculture adoption.Freshwater aquaculture, Economic analysis, Trade, Ecosystems, Pond culture, Fish consumption, Food security, Policies, Regulations, Legislation, Socioeconomic aspects, Yield, Bangladesh,
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