Diclofenac sorption from synthetic water: Kinetic and thermodynamic analysis

This work investigated diclofenac sorption on 0.5g L-1 activated carbon in a range of temperature (288-318K) and of initial sorbate concentration (24-218mgL-1). Thermodynamic modelling was carried out with the Langmuir isotherm. For kinetic modelling we compared the so-called Diffusion-Controlled Langmuir Kinetics (DCLK) and the pseudo-second order (PSO) model. The maximum sorption capacity of the sorbent, equal to 180mgg-1, was independent of temperature. Experimental data fitted well with both kinetic models, yet the DCLK model was found to be more informative about the mechanism of the process. Kinetic parameters (α, β) increased with the temperature, with α value rising from 5×10-5 to 20×10-5 L mg-1min-0.5, and β value rising from 3×10-6 to 20×10-6 L mg-1min-1 in the temperature range investigated

Implementation of Customer Relationship Management (CRM) to Automate Logging Track Record Students and Alumni

Biro Pembinaan Kemahasiswaan dan Hubungan Alumni (BPKHA) Bandar Lampung University has one of the tasks for the alumnus record, but the way that used by BPKHA UBL still manually so that the alumnus data that are collected, it has not been gathered maximally. Therefore, the researchers examined the problem by tracking the footsteps of alumni studies or surveys of graduates have been made one of college accreditation requirements by using Customer Relationship Management (CRM ), because such methods focus on how to attract the alumnus so that they always fill up the alumnus form and register themselves in detail . Tracer Study becomes increasingly important role as it can provide important information for the development of higher education . Additionally tracer study acts as a tool to evaluate the relevance between higher education and the world of work, it can provide useful input for lecturer and administrator to improved performance, as well as give feedback to parents in monitoring their children's education ( Schomburg, 2006 ). From the analysis and the design that have been successfully fabricated, The Software of Information System of Students and Alumnus Record Traces Based Customer Relationship Management (CRM) for Automation. Data Collection, with the stages of planning , analysis, design, implementation and testing. The system is constructed to provide information to the University and alumnus as well as students either acquire phase, enhance, and retain with different features are tailored to the results of the analysis

Analytical solution of the Langmuir-based linear driving force model and its application to the adsorption kinetics of boscalid onto granular activated carbon

The application of intraparticle diffusion models is generally difficult because of complex mathematical structure. The linear driving force (LDF) approach reduces the mathematical effort and provides a reasonable approximation of the intraparticle diffusion theory. In this work, an exact analytical solution of a LDF equation based on the Langmuir equilibrium model (LLDF) was derived. The LLDF model depends on three unknown parameters, namely the adsorbed amount at equilibrium, the maximum adsorbent capacity and the mass transfer coefficient. The LLDF model was used for analyzing the adsorption kinetics of boscalid onto granular activated carbon. The experimental results at equilibrium showed that the maximum adsorption capacity of activated carbon for boscalid and the Langmuir equilibrium constant of the process were 167 mg g−1 and 0.53 L mg−1, respectively. The LLDF equation was successfully applied to the kinetic data, allowing the evaluation of the mass transfer coefficient of boscalid (8.4 × 10−3 h−1). The LLDF model has general validity for describing intraparticle diffusion-adsorption onto porous media and its reliability can be assessed by a simple graphical method

Abstract This Study Aims to Find Out the Effect of Applying Community Language Learning Method on the Students' Achievement in Speaking. the Population of the Study Was the First Year Student at Man 2 Model Medan. in This Study the Sample is 50 Students W

This study aims to find out the effect of applying community language learning method on the students' achievement in speaking. The population of the study was the first year student at Man 2 Model Medan. In this study the sample is 50 students where 25 students took as experimental group and 25 students rest was control group. The data of this study was collected by oral test . It was applied in pre test and post test, then the scores were analyzes by using t-test formula. The result of the analysis showed that t-observed value is higher than t-table value ( 3>2.00 ) at the level os significant 0.05 with the degree of freedom 48. It means that there was a effect of applying community language learning method on the students' achievement in speaking

Pentingnya Kekuatan Finansial Perusahaan Pemborong Demi Kesejahteraan Pekerja Outsourcing dan Kelangsungan Kerjasama dengan Klien

Tujuan penelitian ini adalah mendeskripsikan peranan penting kekuatan finansial Perusahaan pemborong terhadap kesejahteraan pekerja outsourcing dan kelangsungan kerjasama dengan klien yang dianalisis melalui sebuah kasus nyata yang terjadi pada suatu badan penyedia jasa tenaga kerja atau outsourcing dimana Perusahaan outsourcing dihadapkan pada tantangan finansial berkaitan dengan masalah pembayaran gaji karyawan yang berdampak pada beberapa hal, diantaranya kesejahteraan karyawan, pengadaan perlengkapan keselamatan kerja, hubungan antara pengguna jasa, penyelenggara jasa, dan lain-lain. Penelitian ini adalah penelitian deskriptif kualititatif. Hasil analisis didapat berupa penyelesaian dari tantangan finansial yang mencakup penjelasan langkah-langkah yang harus diambil berdasarkan tingkat urgensi. Teknik pemecahan masalah yang digunakan berupa serangkaian langkah-langkah komunikasi antara pengguna jasa dan penyelenggara jasa sehingga pada akhirnya masalah tersebut dapat diselesaikan dengan baik

Adsorption of Amoxicillin onto Organo-Modified Zeolitic Tuff

In this work, the ability of surface modified zeolite (SMZ), obtained by ion exchange of phillipsite-rich tuff with HDTMA (hexadecyltrimethylamm onium)-Br or HDTMA-Cl, to adsorb amoxicillin was investigated. The effect of surfactant modification was explored by contacting the tuff with HDTMA solutions at different concentrations (50-200% of the zeolite's external cation exchange capacity). It was found that for the higher surfactant concentration used the formation of a surfactant bilayer (compact for HDTMA-Br, patchy HDTMA-Cl) occurs. The results of the adsorption experiments showed that SMZ exhibited a higher adsorption capacity (especially at low solute concentrations) and a faster adsorption rate for amoxicillin than the unmodified tuff. The interaction between amoxicillin and the adsorbents was mainly ascribed to electrostatic forces