Landfill leachate treatment by combination of electro - fenton and sequencing batch reactor method

Landfill leachate contains a large amount of organic, inorganic and heavy metal contents. Untreated leachate is a potential source to effect of soil, surface and groundwater. The combined treatment offers an alternative technique in dealing to leachate treatment. This research is to determine the effectiveness of combined electro-Fenton and sequencing batch reactor (SBR) method on the removal of SS, colour, COD and NH3-N. The experimental involved three major parts were coagulation-flocculation, electro-Fenton and SBR method. This process could be operated independently in a batch mode and optimum conditions for each treatment were identified. In the combined process, leachate was first fed to coagulation-flocculation for pre-treatment. Then, the effluent from that process was oxidized in electro-Fenton process. The final process is the effluent of leachate was fed to a SBR method. The combined treatment was operated under the optimum conditions for all the processes. The result of coagulation-flocculation shown PAC is more effective at 2500 mg/L of optimum dosage. After coagulation-flocculation process, the removal of SS, colour, COD and NH3-N were 80%, 77%, 61% and 35% respectively. The result of electro-Fenton shown Al-Al is more effective at 200 A/m2 of optimum current density, 25 minutes of optimum reaction time, 4 of optimum pH, 800 mg/L of optimum H2O2 dosage and 1000 mg/L of optimum FeSO4•7H2O dosage. After electro-Fenton process, the removal of SS, colour, COD and NH3-N were 87%, 95%, 82% and 65% respectively. The final process of SBR effluent was approaching neutral pH at 6.90 at 2800 mg/L of optimum MLSS and 6 h of optimum reaction time. The overall performance of combined treatment on the removal of SS, colour, COD and NH3-N were 84%, 82%, 87% and 78% respectively. Thus, this combined treatment offers as an alternative technique for landfill leachate treatment on the removal of pollutants

Optimization of injection molding parameter of ti-6al-4v powder mix with palm stearin and polyethylene for the highest green strength by using taguchi method

This paper present the Taguchi method of L27 (313) orthogonal array as a tool in optimization of Metal injection molding (MIM) parameters for the highest green strength. Injection pressure, injection temperature, powder loading, mold temperature, holding pressure and injection speed are Parameters to be optimized. Besides those, interaction of the injection pressure, injection temperature and powder loading were studied. The metal powder of Ti-6Al-4V is mixed with binder 60wt% of palm stearin and 40wt% of polyethylene successfully injected at optimum parameter condition: 350 bar of injection pressure, 140oc of injection temperature, 65vol% of powder loading, 50oc of mold temperature, 600 bar of holding pressure, and 10ccm/s of the injection rate. Analysis of variance (ANOVA) for the best signal to noise ratio (S/N) presents the contribution of the parameters to the quality characteristic (green strength). Results show that the mold temperature has highest significant percentage (27.59%) followed by powder loading (15.44%) and injection pressure (12.30%) Nevertheless, the analysis of variance does not show any contribution from interaction

Pain management practices by nurses: An application of the knowledge, attitude and practices (KAP) Model

Pain is one of the most common reasons that drives people to go to hospitals.It has been found that several factors affect the practices of pain management. In this regard, this study aimed at investigating the underlying determinants in terms of pain management practices.Based on reviewing the previous studies and the suggestions of the KAP model, it was hypothesized that the main elements of the KAP model (attitudes and knowledge) significantly predict the variation in the practices of nurses regarding pain management. A questionnaire comprising the KAP model’ s constructs , i.e. knowledge and attitude towards pain management ,as well as pain management practices, was used to collect data from 266 registered nurses ( n=266) who are deemed competent in the management of patients’ pain in the Jordanian public hospitals. The two constructs, attitude and knowledge, which are the main determinants of the KAP model were found to independently predict nurses’ practices of managing patients’ pain.Knowledge of pain management was found to be the strongest predictor.Additionally, it was found that about 69% of the variance in pain management could be explained by the constructs of the KAP model. Therefore, it is recommended that the Jordanian hospitals and universities focus on nurses’ knowledge and attitude towards pain management in order to enhance their practices in the field of pain management

Determination of Melting Layer Boundaries and Attenuation Evaluation in Equatorial Malaysia at Ku-Band

Upsurge in bandwidth demand in recent times for real-time data transmission have put serious constraints on satellite communication channels, leading to congestion of the lower frequency bands; necessitating migration to higher bands (Ku, Ka and V) with attendant problems such as signal fading, depolarization and attenuation due to presence of hydrometeors. There is need to separately account for attenuation due to the melting layer along the earth-space microwave links. One year data from ground-based S-band meteorological radar sourced from Kluang station of the Malaysian Meteorological Department was processed to build the vertical reflectivity of rain profile for UTM, Malaysia. Results from this work suggested that the effects of the melting layer on signal attenuation at Ku-band can be quite significant in the tropical and equatorial regions. It was estimated to be 13.36 dB and 15.44 dB at 0.01% of the time exceeded using Laws-parsons and Marshall-Palmer regression coefficients, respectively. Furthermore, it was observed that ITU-R. P.618-11 model largely under-estimated the attenuation along the slant-paths because of its failure to account for attenuation due to the melting layer in its formulation by its assumption of constant rain rate; thus rendering it unsuitable for rain attenuation predictions in the tropics

Channeling assessments in English language learning via interactive online platforms

Technology adoption in classrooms has impacted the way educational practitioners conduct assessments. Online quizzes are preferred compared to paper-pencil based tests. However, very few information that explains the contribution of online assessment towards holistic attainment of students in English. The present study aimed at examining the effects of online assessments on students’ performance. This research employed a quasi-experimental study to evaluate the role of interactive online assessments toward students’ performance in English. Eighty-six undergraduate students in TESL participated in this study; 53 were randomly assigned to the online group while 33 were assigned to the control group. The research computed t-tests to compare the performance of both groups on five different assessments. The results revealed that the online assessment group performed better on four assessments tested—listening and reading skills. The control group performed significantly higher on the assessment that involved presentation (evaluated speaking skill). These findings indicate that online assessments enhance students’ mastery of listening, reading, and writing skill but rather not so much influence on verbal skills. This research implies that educational practitioners should not entirely rely on interactive online platforms. To incorporate the blended-learning approach, classroom activities must consist of a combination of online and offline strategies

Kemampuan Komunikasi Matematis Siswa Kelas VII SMP Negeri 1 Mojolaban Tahun Pelajaran 2014/2015

. The purpose of this research was to describe the ability of student's mathematical communication who had low, medium, and high early mathematics ability in class VII SMP Negeri 1 Mojolaban on aspect grammatical, sociolinguistic, strategic, and discourse competence in solving mathematics problem. This research was a qualitative research. The subjects in this research were seven students of class VIIE SMP Negeri 1 Mojolaban, which consisted of three students who had low early mathematical ability, two students who had medium early mathematics ability, and two students who had high early mathematical ability.The subjects in this research were taken by using the purposive sampling technique. The main instrument used in this research to collect the data was the researcher and the other instrument were a task that contains of test question and interview guide instrument. Data analysis technique were conducted by data reduction, data presentation and conclusion. The validity of the data was conducted by using time triangulation that compared the data of the first task based interviews with the data of the second task based interviews. The equal valid data of mathematical communication ability on aspect grammatical, sociolinguistic, strategic, and discourse competence was made the main finding, whereas the different of valid data was made other finding of the research. The result of this research are the students who had low, medium, and high early mathematics abilities were have imperfect mathematical communication on grammatical, sociolinguistic, strategic, and discourse competence. The imperfection that appear on each competence caused by some indicators that not fulfilled completely

Effectiveness of different cleanup sorbents for the determination of avermectins in fish by liquid chromatography tandem mass spectrometry.

An effectiveness and comparative study of cleanup sorbents used in dispersive solid phase extraction (DSPE) for the determination of avermectins, including emamectin (EMA), abamectin (ABA), doramectin (DOR), moxidectin (MOX), and ivermectin (IVE), was performed. Three different types of cleanup sorbents, alumina (Al), primary and secondary amine (PSA) and octadecyl (C18), were used to remove the matrix interference in fish samples. Homogenised fish samples were extracted with acetonitrile, magnesium sulphate anhydrous and sodium chloride. The cleanup sorbents were separately applied to the supernatant during the DSPE procedure; the mixtures were shaken and centrifuged, and the supernatant was dried. The extracts were reconstituted with acetonitrile/water and quantified by liquid chromatography tandem mass spectrometry with electrospray ionisation in the positive mode with two product ions that were monitored by selected reaction monitoring. The performance of each cleanup sorbent was observed for its accuracy and precision in a spiked blank sample at a concentration of 5 μg kg−1. The combination of the cleanup sorbents PSA and C18 was found to be the most effective in the cleanup of the fish samples. In the validation tests, the detection limit was in the range of 0.3 μg kg−1 to 0.4 μg kg−1, and the quantitation limit for all avermectins was 1 μg kg−1 in the linearity range of 1–15 μg kg−1. The recoveries of avermectins were 91.9–102.5%, with a relative standard deviation lower than 19%

IRPS – An Efficient Test Data Generation Strategy For Pairwise Testing.

Software testing is an integral part of software engineering. Lack of testing often leads to disastrous consequences including loss of data, fortunes, and even lives

Analysis of Capital Structure in Measuring Rentability and Solvability of Cosmetics Companies and House Hold Goods Listed on Indonesia Stock Exchange Period 2015-2017

The purpose of this research to measure capital structure of cosmetics companies and house hold goods listed on the Indonesia Stock Exchange for the period 2015-2017 using vertical analysis, return on equity (ROE), earnings per share (EPS), debt on equity ratio (DER), and Long-Term Debt on Equity Ratio (LTDtER). This research uses descriptive methods, secondary data used is company documentation and financial reports in the form of balance sheet PT.Akasha Wira International Tbk, PT. Kino Indonesia Tbk, PT.Mandom Indonesia Tbk, PT. Martina Berto Tbk, PT. Mustika Ratu Tbk and PT. Unilever Indonesia Tbk in 2015 until 2017. The results showed that the perfomance of cosmetics companies and house hold goods reduction in 2015 until 2017 the form of Return on Equity (ROE) and increase in Debt on Equity Ratio (DER) and also fluctuations in Long-Term Debt on Equity Ratio (LTDtER). PT. Kino Indonesia and PT. Mustika Ratu are companies with financial performance whose capital structure management is not optimal due to the composition and proportion of long-term debt with equity that is not balanced with the returns and risks borne by the company during the 2015 to 2017 period. Keywords: Capital Structure, Return on Equity (ROE), Earnings Per Share (EPS), Debt on Equity Ratio (DER), Long-Term Debt on Equity Ratio (LTDtE