Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram

Prisma Sains: Jurnal Pengkajian Ilmu dan Pembelajaran Matematika dan IPA IKIP Mataram

Basic info

  • Publisher: IKIP Mataram
  • Country of publisher: indonesia
  • Date added to EuroPub: 2019/Feb/09

Subject and more

  • LCC Subject Category: Education, Science Education
  • Publisher's keywords: Education, Mathematics, Physics, Biology and Chemistry, Science Education
  • Language of fulltext: indonesian
  • Full-text formats available: PDF

Publication charges

  • Article Processing Charges (APCs): No
  • Submission charges: No
  • Waiver policy for charges? No

Editorial information

Open access & licensing

  • Type of License: CC BY
  • License terms
  • Open Access Statement: Yes
  • Year open access content began: 2013
  • Does the author retain unrestricted copyright? False
  • Does the author retain publishing rights? False

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  • Permanent article identifier: DOI
  • Content digitally archived in: Nopolicy
  • Deposit policy registered in: None

This journal has '81' articles

PENGARUH BLENDED LEARNING DALAM PEMBELAJARAN BERBASIS MASALAH (PBL) TERHADAP HASIL BELAJAR MAHASISWA IKIP MATARAM PADA MATERI PENCEMARAN LINGKUNGAN

PENGARUH BLENDED LEARNING DALAM PEMBELAJARAN BERBASIS MASALAH (PBL) TERHADAP HASIL BELAJAR MAHASISWA IKIP MATARAM PADA MATERI PENCEMARAN LINGKUNGAN

Authors: Citra Ayu Dewi
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Abstract

To teach environmental pollution subject material must be adjusted to real daylife problem because environmental pollution can’t last from human life. Associated with the characteristics of environmental contamination materials will be more appropriate if taught with problem-based learning strategies and to provide more learning opportunities, discussing the concept thoroughly, improve the transfer of learning and experience in leading the learning itself so that a blended learning is needed to be able to improve the process of critical thinking and lead to an optimal learning environment. This study has proved that the learning process that uses PBL and blended learning turned out to provide better student study result include cognitive, affective and psychomotor domains. In addition, the application of blended learning in PBL can also provide a positive perception.

Keywords: blended learning, problem based learning, study result
HUBUNGAN ANTARA LATAR BELAKANG PENDIDIKAN FORMAL, PENGETAHUAN, STATUS EKONOMI DAN SIKAP DENGAN UPAYA MASYARAKAT MENGENAI BUDIDAYA Gyrinops versteegii (Gilg.) Domke DI PULAU LOMBOK

HUBUNGAN ANTARA LATAR BELAKANG PENDIDIKAN FORMAL, PENGETAHUAN, STATUS EKONOMI DAN SIKAP DENGAN UPAYA MASYARAKAT MENGENAI BUDIDAYA Gyrinops versteegii (Gilg.) Domke DI PULAU LOMBOK

Authors: Taufik Samsuri
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Abstract

Tujuan penelitian ini ialah: (1) untuk mengungkap bagaimana latar belakang pendidikan formal, pengetahuan, status ekonomi, sikap dan upaya budidaya masyarakat mengenai budidaya Gyrinops versteegii (Gilg.) Domke di pulau Lombok. (2) untuk mengetahui hubungan latar belakang pendidikan formal, pengetahuan, status ekonomi dan sikap dengan upaya masyarakat mengenai budidaya Gyrinops versteegii (Gilg.) Domke di pulau Lombok. Jenis penelitian ialah penelitian survei dengan rancangan deksriptif kuantitatif dan deksriptif korelasional. Data hasil penelitian dianalisis menggunakan statistik deskriptif. Sedangkan hubungan latar belakang pendidikan formal, pengetahuan, status ekonomi dan sikap dikorelasikan dengan upaya masyarakat mengenai budidaya Gyrinops versteegii (Gilg.) Domke menggunakan uji korelasi bivariat product moment yang dilanjutkan dengan analisis regresi menggunakan bantuan paket program SPSS 0.17 for Windows. Hasil penelitian ini menunjukkan bahwa (1) tingkat latar belakang pendidikan formal, sebesar 25,71% dengan kategori sangat rendah, pengetahuan sebesar 67,23% dengan kategori cukup, status ekonomi sebesar 50 % dengan kategori rendah, sikap sebesar 65,40% dengan kategori cukup, dan upaya budidaya Gyrinops versteegii sebesar 54,42% dengan kategori rendah. (2) Hasil analisis hubungan pada penelitian ini menunjukkan bahwa ada hubungan yang signifikan antara latar belakang pendidikan formal, pengetahuan, status ekonomi dan sikap dengan upaya budidya Gyrinops versteegii dengan nilai korelasi sebesar 0,898 dan koefisien determinasi (R2) sebesar 0,806.

Keywords: Latar belakang pendidikan, pengetahuan, status ekonomi, sikap, upaya budidaya, Gyrinops vesrteegii
PENGEMBANGAN PERANGKAT PEMBELAJARAN SAINS SMP BERORIENTASI PADA PENDEKATAN SAINS TEKNOLOGI MASYARAKAT UNTUK MENINGKATKAN KEMAMPUAN KOGNITIF

PENGEMBANGAN PERANGKAT PEMBELAJARAN SAINS SMP BERORIENTASI PADA PENDEKATAN SAINS TEKNOLOGI MASYARAKAT UNTUK MENINGKATKAN KEMAMPUAN KOGNITIF

Authors: Hunaepi
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Abstract

The availability of science learning instructional that integrate between the science, society and technology is still very limited so that it needs to be developed science-learning instructional with science, society and technology oriented. This learning instructional development aims to develop science learning instructional with science, technology and society approach oriented to improve students' cognitive abilities. Learning instructional that have been developed in trials in class VIIb with a number of 30 students at State Yunior High School 2 Sepulu Madura through One Group Pretest-Postest Design. Instructional development uses the Kemp development model. The results showed that RPP validation, student textbooks, Student Worksheets, and category rating sheets were feasible with validity of instrument reliability of RPP 91%; Student book 90%; Student Worksheet 92%. The highest teacher activity is to guide the experiment by 22% at meeting one (P1) and at the second meeting (P2) 24%. Highest student activity is Observing with 22% (P1) and 24% (P2). Lesson learned on (P1 and P2) is implemented (92%) and (75%). Student responses to the instructional and learning are good categorized or students respond positively. Cognitive abilities seen from the completeness of Pretest learning indicators averaged <60 categorized incomplete, Postest average ≥ 60 categorized complete, individual completeness on average Pretest <60 categories incomplete, Postest average ≥ 65 category of completeness, and mastery classically on Pretest <75 is categorized incomplete, whereas in Postest ≥ 75 is complete. The conclusion of the research shows that the approach of Science, Techonology, and Society on damage and environmental pollution subject material in State Junior High School 2 Sepulu can improve students' cognitive abilities and learning instructional used in this research categorized as valid and reliable.

Keywords: Science Technology and Society, Cognitive
METAKOGNITIF, PROSES SAINS, DAN KEMAMPUAN KOGNITIF MAHASISWA DIVERGEN DAN KONVERGEN DALAM PBL

METAKOGNITIF, PROSES SAINS, DAN KEMAMPUAN KOGNITIF MAHASISWA DIVERGEN DAN KONVERGEN DALAM PBL

Authors: Yusran Khery, Subandi Subandi, Suhadi Ibnu
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Abstract

Tujuan dari penelitian ini adalah: (1) mengetahui perbedaan kesadaran metakognitif dan kemampuan kognitif mahasiswa yang dibelajarkan dengan strategi PBL dan yang konvensional; (2) mengetahui perbedaan kesadaran metakognitif, keterampilan proses sains, dan kemampuan kognitif antara mahasiswa dengan karakter berpikir divergen dan konvergen yang dibelajarkan dengan strategi PBL. Penelitian ini menggunakan tiga macam rancangan yaitu rancangan penelitian deskriptif, rancangan eksperimental semu dan rancangan pra-eksperimental untuk menjawab tujuan penelitian nomor satu sampai tiga secara berturut-turut. Instrumen yang digunakan dalam penelitian ini adalah: (1) angket karakter berpikir divergen dan konvergen; (2) angket kesadaran metakognitif; (3) lembar observasi keterampilan proses sains; dan (4) tes kemampuan kognitif. Data dianalisis secara statistik inferensial. Hasil penelitian menunjukkan bahwa: (1) tidak terdapat perbedaan kesadaran metakognitif dan kemampuan kognitif mahasiswa yang diperoleh dari pembelajaran dengan strategi PBL dan strategi konvensional; (2) tidak terdapat perbedaan kesadaran metakognitif dan kemampuan kognitif antara mahasiswa divergen dan yang konvergen. Keterampilan proses sains mahasiswa divergen lebih baik dibandingkan yang konvergen.

Keywords: kesadaran metakognitif, proses sains, kemampuan kognitif, karakter berpikir, PBL
PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE NHT (NUMBERED HEAD TOGETHER) MENGGUNAKAN PETA KONSEP TERHADAP HASIL BELAJAR FISIKA SISWA

PENGARUH MODEL PEMBELAJARAN KOOPERATIF TIPE NHT (NUMBERED HEAD TOGETHER) MENGGUNAKAN PETA KONSEP TERHADAP HASIL BELAJAR FISIKA SISWA

Authors: Bahtiar Bahtiar, Musanni Musanni, Laelatul Hapipah
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Abstract

This study aims to determine the effect of cooperative learning type NHT (Numbered Head Together) Using Concept Map to physics learning outcomes of VIII grade students og state MTs. 3 Mataram Academic Year 2012/2013. The hypothesis proposed is there is influence of cooperative learning type NHT (Numbered Head Together) using concept map to physics learning result of VIII grade MTs 3 Mataram students Academic Year 2012/2013 Lesson. Type of research used is Quasy experiment. The population in this research is all VIII grade students of state MTs. 3 Mataram. The sample was taken by purposive sampling technique that is VIIIB class as experimental class and VIIIE class as control class in state MTs. 3 Mataram. The data was collected in study by giving pre-test and post-test to the sample class student. Data collection techniques using objective tests that have been tested for validity, reliability, difficulty index, differentiation, and spotting function. Based on the analysis results of pre-test data obtained the average value of the experimental class is 50.4 and the control class is 51.8. Post-test results showed the average experiment class is 73.51 and the control class is 62.42. The sample student's post-test data were analyzed using tstatistical calculations. Based on the result of data analysis using t-statistic obtained t count 4,13 and t table 1.99. From the results obtained t count> t table at 5% error level, this indicates that Ha accepted and Ho rejected. Based on the results of N-Gain test in the experimental class obtained an increase of 0.47 while in the control class there was an increase of 0.22. The improvement of the students' learning outcomes in the experimental class is classified into the medium category and the control class fall into the low category. Thus, the improvement of students' learning outcomes in the experimental class is higher than the control class (0.47> 0.22). This means that the application of cooperative learning model type NHT (Numbered Head Together) using concept map gave a significant contribution to physics learning outcomes of VIII grade students of State MTs. 3 Mataram on the subject of energy and effort.

Keywords: NHT Cooperative Learning, Concept Map, and Learning Outcomes
MEMBERDAYAKAN BERPIKIR TINGKAT TINGGI (HIGHER ORDER THINKING ) SISWA SMA DALAM PEMBELAJARAN BIOLOGI

MEMBERDAYAKAN BERPIKIR TINGKAT TINGGI (HIGHER ORDER THINKING ) SISWA SMA DALAM PEMBELAJARAN BIOLOGI

Authors: I Wayan Karmana
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Abstract

Tujuan pendidikan biologi di SMA menekankan pengembangan potensi siswa agar menjadi pebelajar mandiri, sehingga siswa memiliki kemampuan berpikir kritis, kreatif, inovatif, dan mampu memecahkan masalah hidup (higher order thinking). Namun kenyataannya kemampuan itu masih relatif rendah, sehingga perlu ditingkatkan.Terkait dengan hal tersebut, maka tujuan penelitian ini adalah untuk menjelaskan efektivitas Problem Based Learning (PBL) dan potensi akademik serta interaksinya dalam memberdayakan high order thinking (kemampuan berpikir kritis, pemecahan masalah, dan kesadaran metakognitif). Jenis penelitian ini adalah quasi eksperimen yang mengimplementasikan dua strategi berbeda dengan rancangan pretestposttest non equivalent control group design faktorial 2x2 yang dilaksanakan pada Tahun Pelajaran 2012/2013. Populasi penelitian adalah siswa kelas X SMA Negeri 8 Mataram, sedangkan sampel penelitian adalah siswa kelas X sebanyak 2 kelas. Instrumen penelitian berupa tes kemampuan berpikir kritis, dan kemampuan pemecahan masalah, dan kuesioner kesadaran metakognitif.. Analisis data dilakukan dengan analisis deskriptif dan untuk menguji hipotesis dilakukan uji anakova yang dilanjutkan uji lanjut Least Significant Difference (LSD). Penghitungan dibantu dengan program SPSS 14 for Windows. Hasil penelitian menunjukkan bahwa Problem Based Learning berpengaruh terhadap kemampuan pemecahan masalah, dan berpikir kritis, tetapi tidak berpengaruh terhadap kesadaran metakognitif. Sementara kemampuan (potensi) akademik tidak berpengaruh terhadap kemampuan pemecahan masalah, berpikir kritis dan kesadaran metakognitif siswa SMA.

Keywords: PBL, potensi akademik, pemecahan masalah, berpikir kritis, kesadaran metakognitif
Aplikasi Senyawa Amida Humat Sebagai Ionofor dalam Membran Elektroda Selektif Ion Ni (II)

Aplikasi Senyawa Amida Humat Sebagai Ionofor dalam Membran Elektroda Selektif Ion Ni (II)

Authors: Muhali
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Abstract

The amide compound derived from humic acid has been applied as ionophore in ion selective electrode (ISE) measurement based on poly vinyl chloride (PVC) membrane. The carboxylic acid group of the humic acid was first modified to the corresponding amide and is expected to form complex with the target cation. This work aims at obtaining selectivity coefficient towards Ni2+ ion. The products of the reactions were observed using infra red (IR) spectrometer. The amide compound derived from humic acid was immobilized into the membrane with composition percentage (w/w) as the following 32% of PVC, 64% of plasticizer of either [orto-nitrophenil octyl ether (NPOE) or dioctylpthalate (DOP) or dibenzyl ether (DBE)], 2% of lipophilic anion [sodiumtetraphenylborate (NaTPB), and oleic acid], and 2% of ionophore the humic amide, respectively. The results show that ISE membrane give selective response to the Ni2+ ion at pH of 4,5 with response time of approximately 80 seconds. Among many others, the cations that give strong emf interference include Cu2+, Li+, K+, Pb2+, Na+, Zn2+, and Ca2+. The Nernstian factor of ISE membrane is close to +28 mV per decade with linear range of concentration of pNi2+ of 1-6, with composition PVC membrane, DBE as plasticizer, oleic acid as lipophilic anion, and humic amide as ionophore, respectively.

Keywords: Humic amide, ionophore, ion selective electrode, membrane, and Ni2+ ion
IMPLEMENTASI MODEL PBL (PROBLEM BASED LEARNING) UNTUK MENINGKATKAN HASIL BELAJAR DAN KEMAMPUAN BERPIKIR KRITIS SISWA

IMPLEMENTASI MODEL PBL (PROBLEM BASED LEARNING) UNTUK MENINGKATKAN HASIL BELAJAR DAN KEMAMPUAN BERPIKIR KRITIS SISWA

Authors: Saiful Prayogi, Muhammad Asy’ari
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Abstract

This research was aimed to improve the students’ learning achievement and critical thinking ability through problem based learning (PBL) model, the method which was applied in this research was classroom action research. It consisted of two cycles and each cycle consisted of planning, implementing, observing, and reflecting. The data was taken by giving the students test, it was in form of multiple choice test. The was used to know the students learning achievement to know students critical thinking, essay test was used. The finding of the research show that there was improvement from cycle to cycle. (1) at the first cycle: the percentage score of students mastery was 63.16% ; the mean score of the students critical thinking ability was 51.31 ; (2) at the second cycle : percentage score of the students mastery was 85% ; mean score of the students critical thinking ability was 72.08 and catagorized into critical and between 62.59 – 81.25. based on the finding, it can be concluded that problem based learning (PBL) model can improve the students learning achievement and critical thinking ability.

Keywords: Problem Based Learning (PBL) Model, Students Learning Achievement, and Critical Thinking Ability
ANALISIS KESULITAN PEMAHAMAN KONSEP DAN PRINSIP MATERI POKOK DIMENSI TIGA SISWA KELAS XI SMK KEPERAWATAN YAHYA BIMA

ANALISIS KESULITAN PEMAHAMAN KONSEP DAN PRINSIP MATERI POKOK DIMENSI TIGA SISWA KELAS XI SMK KEPERAWATAN YAHYA BIMA

Authors: Syahrir Syahrir, Kusnadin Kusnadin, Nurhayati Nurhayati
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Abstract

The results of observations in class XI SMK Health Nursing Yahya Bima note that students still think that math is hard and scary that students often find it difficult when working on math problems. Student difficulties in learning mathematics are also characterized by low daily test results mathematics class XI student of SMK Nursing Yahya Bima. Therefore it is necessary to do an analysis of learning disability and the factors that influence the students' learning difficulties in learning mathematics in particular three-dimensional. This research is a descriptive study conducted on 64 students of class XI SMK Yahya Nursing Bima. Data collected by the method of three-dimensional tests and questionnaires. Tests that have been declared valid and reliable research subjects used to determine which students who received grades of less than KKM defined as research subjects. Questionnaire is used to determine the internal factors and external factors that greatly affect the students' learning difficulties in studying the three-dimensional. Data analysis techniques used in this research is descriptive qualitative and quantitative analysis. The results showed that as many as 33 students have difficulty in solving the three-dimensional, it is due to students 'difficulties in providing examples of specific concepts, students' difficulty in giving up the name space, difficulties in classification, ketidakterampilan students in basic skills, calculation errors, procedural errors , students are not mastering algorithms and do not understand the basic concepts. Factors - factors that cause learning difficulties students have great influence on quite a high level of learning difficulties experienced by students of class XI Vocational Nursing Yahya Way in three dimensions is the subject matter of interest, motivation, talent and intelligence of students who are on average relatively less and methods applied teachers including the use of visual aids in teaching the less even very low.

Keywords: Learning Difficulties, Three Dimensional, Concepts and Principles, Internal and External Factors
EPISTEMOLOGY, CONSTRUCTIVISM, AND DISCOVERY LEARNING IN MATHEMATCS

EPISTEMOLOGY, CONSTRUCTIVISM, AND DISCOVERY LEARNING IN MATHEMATCS

Authors: I Ketut Sukarma
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Abstract

This article describes the epistemology of mathematical scholarship, the constructivism view of mathematics and how mathematical learning can achieve the goals of which one is by studying discovery with a philosophical approach that emphasizes its implications on the learning of mathematics. The world of educational research, especially mathematics has shown a shift, which is more emphasize the teaching and learning process and research methods that apply the concept that, in learning someone to construct his knowledge. Humans construct their knowledge through interaction with objects, phenomena, experiences, and the environment. A knowledge is assumed to be true if it can be useful to confront and solve appropriate problems or phenomena. On constructivism view, knowledge can not be transferred from one person to another, but must be interpreted by one person individually. Knowledge is not something that is finished, but a process that develops continuously. In the process that the activity of someone who wants to know, very instrumental in the development of knowledge. Some factors such as limited previous construction experience, and a person's cognitive structure may limit the establishment of the person's personality. Conversely, conflict situations or anomalies that make people forced to think more deeply and situations that require people to defend themselves and explain in more detail, will develop one's knowledge. Constructivism is divided into three levels: radical, hypothetical realism, and the usual. This difference is based on the relationship between knowledge and existing reality.

Keywords: Epistemology, Constructivism, and Discovery Learning
THE EFFECTIVENESS OF MATHEMATICAL LEARNING BASED ON PROBLEM SOLVING REVIEWED FROM STUDENTS’S MOTIVATION AND LEARNING ACHIEVEMENT

THE EFFECTIVENESS OF MATHEMATICAL LEARNING BASED ON PROBLEM SOLVING REVIEWED FROM STUDENTS’S MOTIVATION AND LEARNING ACHIEVEMENT

Authors: Lalu Saparwadi
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Abstract

This study aims to describe whether there are differences in learning mathematicsbased problem-solving in terms of results and student motivation of mathematics. This type of research is a quasi-experimental research and the design carried out on this study is a pretestpostest nonequivalent group design. In this research, the observation was done twice, before and after treatment. Observations made earlier are called pre-test and later observations are called posttest. The result of the calculation of the implementation of mathematics learning with the problemsolving based approach to student achievement is significant (p = 0,000 <0.05). It showed a Fcount of 1.002 <Ftabel of 1.76 with a significance level of 5%. Thus H0 is accepted and Ha is rejected, meaning there is a significant difference in mathematics learning achievement between problem-solving approach and conventional. The result of the calculation of the implementation of mathematics learning with the problem-solving-based approach to student's learning motivation is significant (p-count = 0.03 <0.05) or refer to Fcount of 1.07 <Ftable of 1.76 with a significance level of 5%. So that Ho accepted, it means there are differences in student learning motivation that is taught between using problem-solving based learning and conventional learning. Learning with problem-solving approaches will be effective if the teacher as an educator prepares the problems according to the context. From the results of this study, the researchers recommend being used as a reference for similar research with different subject materials. This research can be developed by adding other attribute variables such as student self-confidence, verbal ability, motivation, nor critical thinking ability.

Keywords: mathematics learning, problem-solving
EXPLORATION OF RBC AND HGB IN MENCIT (Mus musculus) HYPEROLOLERINOLEMIA

EXPLORATION OF RBC AND HGB IN MENCIT (Mus musculus) HYPEROLOLERINOLEMIA

Authors: Nofisulastri Nofisulastri, Baiq Mirawati
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Abstract

So far there is no clear information about RBC and HGB linkage with hypercholesterolemia, especially for arteriosclerosis and hypertension patient. In the future, this research is expected to add a repertoire of knowledge and people knew about hypercholesterolemia and the utilization of appropriate alternative medicine. A total of 20 mice (Mus musculus) age ± 2 months of hypercholesterolemia caused by cholesterol-rich diet (ad libitum). The data were analyzed by analysis of variance based on Randomized Block Design (RAK) 1% with 5 (five) groups and 4 replications (positive control, negative group, and the group of celery extract dose 0,5 ml with concentration 25%, 50%, 100%). It was concluded that HGB in line with RCB (either treated with celery extract or mice treated with hypercholesterolemia) and the provision of celery extract significantly did not affect RBC and HGB with total blood cholesterol level of mencit.

Keywords: RBC, HGB, Hypercholesterolemia
THE EFFECT OF DISCOVERY-INQUIRY LEARNING MODELS APPLICATION TOWARD LEARNING ACHIEVEMENT ON COLLOID SUBJECT MATTER REVIEWED FROM STUDENTS INITIAL ABILITY

THE EFFECT OF DISCOVERY-INQUIRY LEARNING MODELS APPLICATION TOWARD LEARNING ACHIEVEMENT ON COLLOID SUBJECT MATTER REVIEWED FROM STUDENTS INITIAL ABILITY

Authors: Louisiana Muliawati, Wildan Wildan, Agus Abhi Purwoko
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Abstract

The research has been done to evaluate the influence of discovery-inquiry learning model application on colloid subject to students learning result refer to their initial ability in SMAN 7 Mataram academic year 2012/2013. The result of this research is to know: (1) The result of chemistry learning of students who have high initial ability and low initial ability that learn through discovery-inquiry model with students who follow expository learning in SMAN 7 Mataram. (2) Interaction between learning model and student's early ability to student's chemistry learning result in SMAN 7 Mataram. Research Data processing was conducted through Microsoft Excell. The results of the data analysis showed that students learning results taught using the discovery-inquiri model were higher than using expository in both students with high initial ability and low initial ability. There is no interaction between model and initial ability with students learning result.

Keywords: Learning model, students initial ability, student learning result
THE EFFECT OF ELECTRIC FLOW ON DECORATIVE KROM ELECTROPLATING WITH COPPER BASE METAL TOWARD CORROSION RATE

THE EFFECT OF ELECTRIC FLOW ON DECORATIVE KROM ELECTROPLATING WITH COPPER BASE METAL TOWARD CORROSION RATE

Authors: Ahmadi Ahmadi, Citra Ayu Dewi
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Abstract

In this study a decorative chrome electroplating process has been carried out with a copper base metal, metal electroplating is often used as a means to provide a thin layer on the surface of other metals or substrates using metal which has advantages in terms of property and corrosion resistance. In decorative chrome electroplating nickel and chrome are used as coatings, nickel and chrome are used as coatings because of their protective and decorative properties, protective means they can prevent corrosion and decorative because they look shiny so they look attractive. Copper metal is chosen because of its huge application in the community. This study aims to measure the corrosion rate in copper metal after a decorative chrome electroplating process based on electric current used during the electroplating process. This research is important because during the electroplating process a decorative chrome electoplating technique will be obtained in the form of modules, and the module will be used to train students to increase their skills. This research was conducted in the IKIP Mataram chemical laboratory with a time of one year. The process carried out in this study sequentially is to prepare an electrolyte solution used for electroplating, preparing the copper base metal to be free of oxide or rust, nickel coating and finally coating with chrome. From the coating process carried out then the results will be analyzed the corrosion rate by immersion in NaCl solution at a concentration of 36.05 grams / L for 336 hours, based on variations in electric current used during the electroplating process of 0.5; 1; 1.5; 2; and 2.5 Ampere, the corrosion rate results were 0.029; 0.013; 0.017; 0.022; and 0.012 mm / yr; while the copper metal which is not coated with a corrosion rate is 0.308 mm / yr. Thus it can be concluded that copper metal coated with nickel chrome will effectively resist the lowest rate of corrosion in the current given 2.5 Ampere.

Keywords: Electric Current, Electroplating, Decorative Chrome, Corrosion Rate
SECONDARY IMMUNITY RESPONSE OF MENCIT BALB / C (MUS MUSCULUS) EXPORTED BALI COW TESTISICULAR EXTRACT (BOS SONDAICUS)

SECONDARY IMMUNITY RESPONSE OF MENCIT BALB / C (MUS MUSCULUS) EXPORTED BALI COW TESTISICULAR EXTRACT (BOS SONDAICUS)

Authors: Sri Novita Primawati
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Abstract

Based on previous research by observing leukosit ploriferation of Balb / c mice given Balinese cow testical extract which showed significant result on observation to 72 hours after injection, while at 3 hours and 24 hours is not significant, it is suspected that the immunological response given to testicular extract a secondary immune response. This study aims to determine the ploriferation of Balb / c mice leukocytes exposed at some observation time, whether these include primary or secondary immune responses. Therefore it is necessary to do further research by adding exposure time of 1 day, 3 days, 5 days, and 7 days with only one exposure Con A (at 0 hour only). This study was designed with a complete randomized factorial design. The data obtained were analyzed by ANOVA analysis using F test. The results of this study showed that the influence of immunosuppression was highest on the third day (72 hours) and disappeared on the seventh day. This shows that the immunological response shown during observation of leukocyte proliferation of Balb / c mice is a secondary response.

Keywords: Testicular Extract, Balinese Cow (Bos sondaicus), Secondary Immune Response, Leucocyte Proliferation

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