Alcohol Production from Cassava Starch by Co-immobilized Zymomonas mobilis and Immobilized Glucoamylase

Simultaneous saccharification and fermentation of dextrin£zed cassava starch to glucose and alcohol, respectively, were carried out by co-immobilized Zymomonas mobilis and immobilz'zed glucoamylase (IG). Calcium alginate-entrapped cells and IG (4 : 1 ratio) gave an alcohol productivity of 0.30 glgww cellslh in a batchfermentation process. For continuous fermentation, 54.3 gil alcohol was produced at a dilution rate of 0.3Ih. 60% of the initial activity was lost within 3 days and, thereafter, the system entered a slowly decreasing phase ofalcohol production

PENERAPAN PENDIDIKAN KARAKTER PADA SISWA KOMPETENSI KEAHLIAN TEKNIK KENDARAAN RINGAN SMK NEGERI 2 SURAKARTA

The purpose of this study was to know about: (1) implementation of character education on student of Skills Competency Light Vehicle Engineering SMK Negeri 2 Surakarta; (2) the results of implementation of character education on student of Skills Competency Light Vehicle Engineering SMK Negeri 2 Surakarta. This research used descriptive qualitative method and the design used single case study at SMK Negeri 2 Surakarta. Research subjects were students of Skills Competency Light Vehicle Engineering SMK Negeri 2 Surakarta, as many as 316 students. The research sample as many as 11 students for interview and 87 for questionnaire. Sampling technique was purposive sampling. Data collection techniques used were questionnaire, interview, observation, and documentary method. Testing of the validity instrument was conducted based on the Pearson's Product Moment Correlation. Reliability test instrument used Cronbach's Alpha. The result of this research were: (1) Principal, Vice Principal of Academy Field, Vice Principal of Studentships Field, Vice Principal of Human Resource Development, Vice Principal of School Public Relations Field, Guidance Counselor Teachers and Productive Teachers of Skill Competency Light Vehicle Engineering SMK Negeri 2 Surakarta has implemented a character education systematically to students, especially students of Skill Competency Light Vehicle Engineering, which is a lesson plans and syllabus; (2) implementation of character education is also conducted continuously by the teacher SMK Negeri 2 Surakarta in the form of 3S Program, the training and education of VEDC Malang, P3G Bandung, P4TK Bandung and from the Provincial of Central Java; (3) implementation of character education through co-curricular activities and extracurricular; (4) results showed that students' character of Skill Competency Light Vehicle Engineering SMK Negeri 2 Surakarta average is 77.46%. Students of Skill Competency Light Vehicle Engineering SMK Negeri 2 Surakarta has good character. In addition, there are students who have not been well characterized because it is not strong in having some of the main characters, such as Responsibility and Self-Discipline characters; (5) condition students of Skill Competency Light Vehicle Engineering SMK Negeri 2 Surakarta who do not already have eight main characters have a low level of discipline, lack of initiative, lack of responsibility, and lack of respect for others; (6) condition students of Skill Competency Light Vehicle Engineering SMK Negeri 2 Surakarta which has eight main characters are more disciplined, have initiative, responsible, helpful and growing affection, respect for others and good at gratitude. Keywords: character education, curriculum, syllabus, co-curricular, extracurricula

Perbandingan Hasil Belajar Siswa Menggunakan Model Discovery Learning Dengan Problem Based Learning

This research aimed to compare the learning outcomes in some aspects, such as cognitive aspect, scientific attitude, and science process skills of students. The topic was Circular Motion. This re­search organized at Senior High School 2 Pringsewu, on 1th semester in 2016/2017 using Pretest and Posttest Equivalent Group Design as the research design. Discovery learning model as first experimental class and problem based learning as second experimental class. Base on research, the average value of the cognitive study with N-gain from both classes were 0.44 and 0.42, then the average value of science process skills was 53.44 and 55.63, and the average value of scientific attitude was 79.49 and 83.58. These results indicated that there was no any difference between cognitive study and science process skills students in both of the experimental class, and scientific attitude aspect of problem based learning class was higher than discovery learning class. Penelitian ini bertujuan untuk mengeta­hui perbandingan hasil belajar pada ranah kognitif, sikap ilmiah, dan keterampilan proses sains siswa pada materi gerak melingkar. Penelitian ini dilakukan di SMA Negeri 2 Pringsewu, pada semester ganjil tahun ajaran 2016/2017, dengan desain penelitian Pretest Posttest Equivalent Group Design. Model discovery learning sebagai kelas eksperimen 1 dan Problem Based Learning sebagai kelas eksperimen 2. Berdasarkan penelitian yang telah dilakukan, diperoleh hasil rata-rata nilai kognitif dengan N-gain kedua kelas eksperimen adalah 0,44 dan 0,42, hasil rata-rata nilai KPS adalah 53,44 dan 55,63, dan hasil rata-rata nilai sikap ilmiah adalah 79,49 dan 83,58. Hal ini menunjukkan tidak terdapat perbedaan hasil belajar kognitif dan KPS pada kedua kelas, sedangkan sikap ilmiah kelas problem based learning lebih tinggi dari discovery learning

Analisis Butir Soal Ujian Semester Ganjil Pelajaran Kimia Kelas XI IPA SMA Negeri 10 Pekanbaru Tahun Pelajaran 2013/2014

This study aimed to determine the quality of odd semester exam chemistry lesson for class XI IPA SMAN 10 Pekanbaru in academic year 2013/2014 viewed from relevance of indicator item and distribution of the cognitive taxonomy Bloom, level of difficulty, discrimination index, distracter effectiveness, test item validity, reliability. This research is descriptive ex post facto. Population includes all students in grade XI IPA SMAN 10 as 177 students. Sample consisted 96 students from 27% upper group and 27% lower group. The result from relevance item of indicator showed that from 40 test items there were 97,5% relevance to the test indicator and 2,5% were not relevance to the test indicator. The result from distribution of the cognitive taxonomy Bloom there was comparison C1:C2:C3:C4:C5:C6 is 15%:45%:40%:0%:0%:0% respectively. The result of analysis from level of difficulty there was 12,5% easy test item, 82,5% was medium and 5% was difficult. Furthermore the discrimination index there was 2,5% so bad test item discrimination, 15% bad discrimination, 32,5% medium discrimination, and 50% good discrimination. Viewed from the distracter effectiveness 42,5% had good function and 57,5% could not do their function well. Analysis of test item validity there were 85% valid and 15% were not valid. Reliability of the test was r11 = 0,86. Based on the result of this test can be said to have a low quality with classification readmission items obtained 27,5% items received, 70% repaired, and 2,5% rejected

Pengembangan Model Jaringan Syaraf Tiruan untuk Menduga Emisi Gas Metana dari Padi Sawah

Budidaya padi sawah dengan sistem irigasi tergenang merupakan sumber emisi gas metana (CH4) yang menyebabkan peningkatan pemanasan global. Pada umumnya, pengukuran gas metana dilakukan secara tidak kontinu dengan melakukan sampling dan analisis di lab menggunakan gas chromatography yang cukup mahal. Makalah ini menyajikan model jaringan syaraf tiruan (JST) untuk memprediksi gas metana yang diemisikan dari padi sawah berdasarkan data parameter lingkungan biofisik yang mudah diukur seperti kelembaban tanah, suhu tanah, dan daya hantar listrik (DHL) tanah. Untuk melakukan validasi model, percobaan dilakukan di dua tempat berbeda yaitu di Kanagawa dan Bogor. Perlakuan difokuskan pada pemberian air yang berbeda dengan menggunakan prinsip budidaya system of rice intensification (SRI). Model JST yang dikembangkan menggunakan algoritma back propagation dengan layer masukan terdiri atas 3 node: kelembaban tanah, suhu tanah, dan DHL tanah, sedangkan gas metana dijadikan sebagai keluaran. Dari hasil pembelajaran model JST didapatkan korelasi antara gas metana hasil pengukuran dan model cukup tinggi dengan nilai R2 sebesar 0.93