scholarly journals Interaction between Styrofoam and Microalgae Spirulinaplatensis in Brackish Water System

Toxics ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 43
Author(s):  
Hadiyanto Hadiyanto ◽  
Amnan Haris ◽  
Fuad Muhammad ◽  
Norma Afiati ◽  
Adian Khoironi
Keyword(s):  
Growth Rate ◽  
Brackish Water ◽  
Research Method ◽  
Functional Group ◽  
Water System ◽  
Packaging Material ◽  
Ftir Analysis ◽  
Test Results ◽  
Alcohol Group ◽  
Stress Changes

Styrofoam is a thermoplastic with special characteristics; it is an efficient insulator, is extremely lightweight, absorbs trauma, is bacteria resistant, and is an ideal packaging material, compared to other thermoplastics. The aim of this study was to analyze the interaction between Styrofoam and S. platensis. The study examined the growth of S. platensis under Styrofoam stress, changes in Styrofoam functional groups, and their interactions. The research method was culture carried out in brackish water (12 mg/L salinity) for 30 days. S. platensis yields were tested by FTIR and SEM-EDX and Styrofoam samples by FTIR. The results showed the highest growth rate of S. platensis in cultures treated with 150 mg Styrofoam that is 0.0401 day−1. FTIR analysis shows that there has been a change in the functional group on Styrofoam. At a wavelength of 3400–3200 cm−1 corresponds to the alcohol group and there was an open cyclic chain shown by the appearance of a wavelength at 1680–1600 cm−1 assignment to alkene. SEM-EDX test results show that Styrofoam can be a resource of nutrition, especially carbon for S. platensis to photosynthesize. Increased carbon content of 24.56% occurred in culture, meanwhile, Styrofoam is able to damage S. platensis cells.

Aluminium/Floral Foam Laminated Composites under Flexural and Compression Test

2014 ◽  
Vol 925 ◽  
pp. 205-209
Author(s):  
A.A. Sinar ◽  
Dzainal Nurfarahain ◽  
Z. Firuz ◽  
M.A. Nur Azni
Keyword(s):  
Compression Test ◽  
Functional Group ◽  
Laminated Composites ◽  
Composite Layer ◽  
Laminated Composite ◽  
Optical Microscope ◽  
Ftir Analysis ◽  
Good Adhesion ◽  
Alcohol Group ◽  
Number Of Layers

This study is concerned on evaluation of laminated composites of aluminium (Al) sheet and floral foam (FF) under flexural and compression test. Effect of different layers of Al/FF laminated composites was evaluated. Epoxy and hardener was used as the adhesive to bind the surface between the Al sheet and FF. The information on the functional group that exists in FF during the formation of the foam was verified by Fourier Transform Infrared Spectroscopy (FTIR) analysis. From flexural and compression test, the mechanical properties decreased with the increasing number of layers of Al/FF laminated composites. The load cannot be distributed uniformly across the composite layer thus results in failure. Optical Microscope (OM) was used to see the adhesion between the layers of Al/FF laminated composites. One layer (1L) of Al/FF shows good adhesion while for four layer (4L) of the composites show phase separation and the excess adhesive around the interface. This shows that the adhesion between the layers also contribute to the failure of the laminated composite. FTIR analysis shows that the FF consists of amine group (at 3587.95 cm-1), alcohol group (at 3305.35 cm-1) and alkyl group (>900 cm-1) which is the main functional group found in polyurethane foam.

scholarly journals Metode Lepas Dasar dengan Net Bag pada Pertumbuhan Kappaphycus alvarezii (Doty)

2020 ◽  
Vol 9 (1) ◽  
pp. 49-54
Author(s):  
Ichsan Suryo Wibowo ◽  
Gunawan Widi Santosa ◽  
Ali Djunaedi
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Research Method ◽  
Specific Growth ◽  
Kappaphycus Alvarezii ◽  
Quality Parameters ◽  
Test Results ◽  
Seaweed Farming ◽  
Randomized Design ◽  
Completely Randomized Design

ABSTRAK: Parameter keberhasilan dari kegiatan budidaya rumput laut diukur berdasarkan dari hasil produksi thallus yang dibudidayakan. Metode budidaya yang digunakan dalam kegiatan budidaya rumput laut merupakan salah satu faktor penting yang dijadikan sebagai acuan keberhasilan. Penelitian ini bertujuan untuk mengkaji pertumbuhan dari rumput laut K. alvarezii yang dibudidayakan dengan metode lepas dasar menggunakan net bag yang dimodifikasi. Materi yang digunakan dalam penelitian ini adalah bibit rumput laut K. alvarezii (F2) yang diperoleh dari pembudidaya di Perairan Pulau Kemujan, Kepulauan Karimunjawa. Metode penelitian yang digunakan adalah eksperimen dengan rancangan percobaan berpola Rancangan Acak Lengkap. Perlakuan yang diujikan adalah rumput laut K. alvarezii yang dibudidayakan dengan perlakuan A (satu lapis jaring), perlakuan B (dua lapis jaring), dan perlakuan C (tiga lapis jaring). Penanaman bibit dilakukan selama 42 hari sejak penanaman. Parameter pengamatan meliputi laju pertumbuhan spesifik dan parameter kualitas perairan. Hasil penelitian menunjukkan terdapat pengaruh sistem budidaya lepas dasar menggunakan net bag (P < 0,05) terhadap laju pertumbuhan spesifik K. alvarezii. Metode net bag dengan satu lapis jaring memiliki pertumbuhan terbaik pada 4,95 ± 0,70 %g/hari. ABSTRACT: The success parameters of seaweed farming activities are measured based on the results of cultivated thallus. The cultivation method used in seaweed farming activities is one of the important factors used as a reference for success. This study aimed to assess the growth of K. alvarezii that was cultivated by employing off bottom method in a modified net bag system. The material used in this study was K. alvarezii (F2) seaweed seeds obtained from cultivators in Kemujan Island, Karimunjawa Islands. The research method used was an experiment with a completely randomized design patterned. The treatments tested were K. alvarezii which was cultivated by treatment A (single net), treatment B (double net), and treatment C (triple net). Planting of seeds was carried out for 42 days after planting. Observation parameters include specific growth rate and water quality parameters. ANOVA test results showed that there was a significant influence (P <0.05) on the absolute weight and specific growth rate of K. alvarezii. Results showed that single net bag method given the best growth rate at 4.95 ± 0.70 %g/day.

scholarly journals Biosorben Daun Ketapang dengan Pengaktifan Asam Sitrat sebagai Pereduksi Merkuri

2019 ◽  
Vol 6 (2) ◽  
pp. 92 ◽  
Author(s):  
Yuli Ristianingsih ◽  
Muhammad Aulia Fadhil ◽  
Fariz Maulana Akbar ◽  
Annissa Millenia Ramadhani ◽  
Isna Syauqiah
Keyword(s):  
Gold Mining ◽  
Functional Group ◽  
Mining Industry ◽  
Mercury Content ◽  
Sem Analysis ◽  
Optimum Operating ◽  
Ftir Analysis ◽  
Test Results ◽  
Absorption Bands ◽  
Optimum Operating Condition

South Kalimantan has a gold mining industry that produces waste that can pollute the environment and is harmful to public health. One of the hazardous contaminants contained in the gold mining industry is mercury. This study aims to make biosorbent of ketapang leaves which will be used to reduce mercury content in gold mining waste.. The study began with washing the ketapang leaves to remove the impurities and then dried 3-4 days under the sun to reduce the water content. The next step is a simple carbonization process by using furnaces at a temperature of 300 oC for 30 minutes as the optimum operating condition so that activated carbon is formed called BDK. In the final stage, the biosorbent of ketapang leaves with 0.1 N citric acid was activated to produce biosorbent of ketapang leaves called BDK-COOH. The test results were carried out by SEM and FTIR analysis. The results of SEM analysis showed biosorbents that form large and large pores caused by carbonization and activation processes. Likewise, the results of FTIR analysis formed an active functional group to absorb heavy metals in terms of shifting absorption bands shown by FTIR. However, the adsorption capacity of biosorbent has not been determined so that further research is needed to find out.

PENINGKATAN FLUENCY DAN ELABORATION DENGAN MODIFIED FREE INQUIRY

EDUDEENA ◽  
2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Agus Miftakus Surur
Keyword(s):  
Research Method ◽  
Positive Response ◽  
Lesson Plan ◽  
Class Action ◽  
Material Research ◽  
Test Results ◽  
Student Activity ◽  
Free Inquiry ◽  
Is Research ◽  
Research Type

Researchers chose a modified free inquiry model to help improve students’ fluency and elaboration. The purpose of this research is to know the application of modified free inquiry which can improve the student’s fluency and elaboration of students’ thinking on trigonometric material. Research method in this research is qualitative research method and research type is research of class action. The data in this study were obtained from the results of validation, test results, observation of teacher and student activity, and interview result, then apply data triangulation and theory to check the validity of data. The results showed an increase in fluency and elaboration in students. This means that a modified free inquiry model can help improve students’ fluency and elaboration in trigonometric learning. The results are supported by the observation of teacher and student activity that is in accordance with the lesson plan and also the result of the interview which get positive response from the students.Keywords: modified free inquiry, fluency and elaboration, mathematics

Analisa Pengujian Repeatability Timbangan Elektronik dengan Metode Syarat Teknis Timbangan Non Otomatis dan Metode NMI Australia

2019 ◽  
Vol 4 (2) ◽  
pp. 176-183
Author(s):  
Ponco Wali
Keyword(s):  
Research Method ◽  
Test Methods ◽  
Test Results ◽  
Repeat Testing ◽  
Testing Method ◽  
Technical Requirements

Testing repeat electronic scales with non-automatic scales technical requirements so far is fairly long if not using a calculator or computer. The aim of this research is to compare the repeatability testing method of electronic scales using methods according to the technical requirements of non-automatic scales and the Australian NMI method, both of which refer to OIML R76 in determining the validity or cancellation of electronic scales repeatability testing. This research method is done through repeat testing on 3 samples of electronic scales, then on each electronic scale 2 test methods are performed. The conclusion is that the electronic scales repeatability testing uses the non-automatic scales technical requirements method and the Australian NMI method has some differences although both refer to OIML R76. These differences include several points, namely the charge used, the method of adding additions, the formula for determining electronic scales, and different test results. The Australian NMI method is deemed to make it easier and more time efficient compared to the non-automatic weighing technical requirements method.

scholarly journals Pengaruh Likuiditas, Leverage, Aktivitas, dan Profitabilitas terhadap Nilai Perusahaan pada Sektor Barang Konsumsi yang Terdaftar Di Bursa Efek Indonesia Periode 2015-2018

2020 ◽  
Vol 20 (3) ◽  
pp. 919
Author(s):  
Anju Galingging ◽  
Fery Xaverius Aritonang ◽  
Herlina Novita
Keyword(s):  
Linear Regression ◽  
Multiple Linear Regression ◽  
Consumer Goods ◽  
Firm Value ◽  
Research Method ◽  
Quantitative Method ◽  
Stock Exchange ◽  
Test Results ◽  
Activity Variable ◽  
Independent Variable

The purpose of this study is to determine and analyze the effect of Liquidity, Leverage, Activity, and Profitability on Firm Value in the Consumer Goods Sector Listed on the Indonesia Stock Exchange for the period 2015-2018. This study uses a quantitative method with a desciptive type. The population of this study is the Consumer Goods Sector that is listed on the Indonesia Stock Exchange for the 2015-2018 period, as many as 50 companies. Sampling using purposive sampling and obtained a research sample of 60 samples from 15 sectors of consumer goods multiplied by 4 years. This research method uses multiple linear regression. The coefficient test results obtained from the Adjusted R Square value are 3.7%, which means that the variation in the Firm Value variable described by the independent variable is 96.3%. The research results simultaneously show that liquidity, leverage, activity, and profitability have no effect on firm value. Meanwhile, partially it shows that liquidity, leverage, and profitability have no and insignificant effect on firm value, but for the activity variable has a significant effect on firm value.

scholarly journals Use of Game-Based Guidance to Increase Career Awareness of Street Children

2019 ◽  
Vol 6 (2) ◽  
pp. 125-132
Author(s):  
Elia Firda Mufidah
Keyword(s):  
Experimental Design ◽  
Research Method ◽  
Street Children ◽  
Drop Out ◽  
Test Results ◽  
Career Awareness ◽  
Guiding Principles ◽  
Out Of School

Street children are still a problem that needs to be moved. There are still many street children who drop out of school and do not understand what is related to the work taken. Game-based tutoring is in accordance with guiding principles and games so that children can be interested in joining this service. This research method uses pretest-posttest one group pre-experimental design. This study aims to find out how to use this program. This program aims to increase awareness. The Wilcoxon Career Awareness Test Results were obtained by Asymp. Sig = 0.043. Asymp comparison. Sig = 0.043 <α = 0.05 then Ho is accepted and H1 is rejected. Associated with a significant priority on the career awareness scores of street children before the implementation of assistance based on street children's awareness planning. The results of this study are increased career awareness of street children

scholarly journals HUBUNGAN ACCESS BLOCK DENGAN PERBURUKAN KONDISI PASIEN DI INSTALASI GAWAT DARURAT RSUD ULIN BANJARMASIN

2020 ◽  
Vol 11 (1) ◽  
pp. 110-119
Author(s):  
Julianto Julianto ◽  
Izma Daud ◽  
Sari Milyati
Keyword(s):  
Research Method ◽  
Sampling Technique ◽  
P Value ◽  
Test Results ◽  
Hospital Emergency ◽  
Cross Sectional ◽  
Analytical Design ◽  
A Value ◽  
Relationship Of ◽  
The Relationship

Abstrak  Latar Belakang :Access block adalah situasi dimana pasien yang mengalami lama rawat di IGD 6 karena kurangnya akses ke ruang rawat inap dan kepadatan jumlah pasien yang tidak terkendali, dampaknya ditemukan bahwa semakin lama access block  semakin tinggi pula perburukan pasien dalam 24 jam.Tujuan : ini bertujuan untuk mengetahui hubungan access block dengan perburukan kondisi pasien di Instalasi Gawat Darurat RSUD Ulin Banjarmasin.Metode :Penelitian menggunakan desain analitik dengan pendekatan cross sectional. Jumlah sampel yang diambil berjumlah 40 orang dengan teknik pengambilan accidental sampling. Analisis data melalui uji spearman rank.Hasil : Hasil uji dipapatkan nilai p hitung 0,000 (0,05) ada hubungan antara access block dengan perburukan kondisi pasien di instalasi gawat darurat RSUD Ulin Banjarmasi.Simpulan: Berdasarka hasil penelitian Ada hubungan antara access block dengan perburukan kondisi pasien di Instalasi Gawat Darurat RSUD Ulin Banjarmasin dengan nilai P= 0,000 nilai α = 0,05 dengan nilai koefisien korelasi 0,588 Kata kunci: Access Block, Perburukan Pasien. Abstract Background :Access block is a situation where patients who experience length of stay in the ED 6 due to lack of access to the inpatient room and uncontrolled density of patients, it is found that the longer the access block the higher the deterioration of patients in 24 hours.Purpose: This study aims to determine the relationship of access block with deteriorating condition of patients in Emergency Installation Ulin Hospital Banjarmasin.Method : The research method uses an analytical design with a cross sectional approach. The number of samples taken is 40 people using the accidental sampling technique. Data analysis through spearman rank test.Result: The test results obtained p value calculated 0,000 (0.05) there is a relationship between the access block and deterioration of the patient's condition at the Ulin Banjarmasin Hospital emergency department.Conclusion: Based on the results of the study, there is a relationship between the access block and the worsening of the patient's condition at the Emergency Department of RSUD Ulin Banjarmasin with a value of P = 0.000 value α = 0.05 with a correlation coefficient value of 0.588. Keywords: Access Block, Patient worsening 

scholarly journals Promoting Color Brightness of Clown Loach (Chromobotia macracanthus Bleeker) by Mixing Red Spinach (Amaranthus tricolor L.) Powder with Feed Stuff

2020 ◽  
pp. 21-30
Author(s):  
Ayi Yustiati ◽  
Syakirah Imtinan Zurwana ◽  
Achmad Rizal ◽  
Yuli Andriani
Keyword(s):  
Research Method ◽  
Survival Rates ◽  
Optimal Dose ◽  
Primary Data ◽  
Test Results ◽  
Growth Data ◽  
Amaranthus Tricolor ◽  
Randomized Design ◽  
Powder Addition ◽  
Completely Randomized Design

The purpose of this research is to determine the optimal dose of the addition of red spinach powder to artificial feed on the brightness of clown loach. This research was conducted at Aquaculture Laboratory Building 4 Faculty of Fisheries and Marine Sciences of Universitas Padjadjaran from April to May 2020. This research method is experimental with a Completely Randomized Design consisting of four treatments and three replications. The red spinach powder addition treatment used 0%, 2%, 4%, and 6% of the feed amount. The parameters observed are color value as primary data by using Toca Color Finder, while the growth, survival rate, and water quality as support data. Color assessment results were analyzed using the Kruskal-Wallis test, if there were significant differences, Z test would be performed. Growth data and survival rates were analyzed using Analysis of Variance (ANOVA). Because the F test results were not significantly different, the Duncan test was not carried out. The results showed that the addition of  6% red spinach powder is the best treatment with an increased color brightness value of 5,63.

scholarly journals Project Based Self-Regulated Learning as a Parenting Model to Increase the Attitude of Responsibility of Children Age 5-6 Years

2020 ◽  
Vol 3 (1) ◽  
pp. 61-70
Author(s):  
Kamtini Kamtini ◽  
Damaiwaty Ray ◽  
Dorlince Simatupang ◽  
Salsabila Hasiana Tanjung ◽  
Husni Wardi Tanjung
Keyword(s):  
Goal Setting ◽  
Research Method ◽  
Project Based Learning ◽  
Self Control ◽  
Test Results ◽  
Social Environments ◽  
Learning Models ◽  
Self Regulated Learning ◽  
Regulated Learning ◽  
Model Project

Stimulating the attitude of responsibility to the child, should the child be given tasks that the child should accomplish. The Treatment that can be given to children is by using the concept of learning model project based learning. In addition, the child is also able to regulate or control himself. So the children know and work on their duties. This is called self-regulated learning, the child is able to choose decisions and self-control, self-initiated initiatives that include goal setting and setting efforts to achieve objectives, management of time, and set Physical and social environments. This research was done to find how the project based learning role when associated with self-regulated learning in the attitude of responsibilities of children age 5-6 years. This research method uses experimental research by testing the use of project-based self-regulated learning models on the child's responsibility. Based on the test results done then it is derived that the model of project based self-regulated learning can significantly improve the attitude of children’ responsibility. The attitude of responsibility will change significantly when the treatment is repeatedly done to children.

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