Assessment is one of the important stages in the learning process of Indonesia because through the assessment of teachers to know the extent to which the learning objectives have been achieved. Assessment can be done through measurement (quantitative description) and / or through non-measurement (qualitative description). When teachers collect information on students' level of understanding through questions, observations, and assignments the teacher actually has conducted a non-measurement evaluation. The activity of the teacher is very useful in determining the level of mastery of students and in assessing the effectiveness of the learning process. Accurate information about student learning outcomes, interests and needs can only be obtained through effective assessment and assessment. The current assessment is a portfolio assessment that has many benefits for both teachers and students. Portfolio assessment is broader than assessment through tests, as with portfolios, teachers can follow cognitive development, attitudes, interests and student activities related to math. Thus, teachers can utilize the portfolio in improving the quality of learning which in turn will improve the quality of student learning outcomes.
The availability of non-renewable energy has recently been running low and so impacts electrical energy. Renewable energy is converted from natural sources to kinetic energy. The Double Propeller Water Turbine is a water turbine that is suitable to be applied using a small flow head. This research is a development of previous research by changing the degree of inclination of the blade angle on the turbine, which is used to determine changes in the power and efficiency of the Double Propeller turbine at various speeds. The results showed that the Double Propeller turbine rotation’s performance was directly proportional to the slope of the turbine blade angle. The optimum angle of attack on the hydro turbine affected the lift force and the ability of the water flow to capture water power. At the lowest blade angle, which is 20 degrees, the highest rotational speed is obtained with a value of 335 rpm. The turbine generates the most significant power with a blade angle of 20o, with a value of 4.81 watts, and the highest efficiency is 24%. The degree of blade angle affects the performance of the Double Propeller turbine.
Abstrak: Fenomena kenakalan pada pelajar kian marak selama beberapa tahun terakhir ini. Beberapa media baik media massa maupun media cetak seperti Koran, kerap melaporkan peristiwa kekerasan pelajar seperti tawuran antar sekolah yang menjadi keprihatinan kita bersama. Kasus kekerasan antar pelajar, dipicu dari olok-olokan, surat kaleng yang berisi hinaan/tantangan berkelahi, berebut pacar, dan juga ketidak trimaan kegagalan saat berkompetisi. Pengaruh buruk yang dibawa oleh seorang teman terkadang akan menular pada kelompok geng.Bilamana hal ini tidak segera tertangani akan meluas dan meruntuhkan moral para pelajar. Kaum muda haruslah banyak berkegiatan positif, menjalin hubungan baik antar sesama teman dan suka akan tegur sapa serta saling memaafkan satu sama lain. Salah satu metode dalam mengatasi fenomena kenakalan pada siswa ialah metode art therapy yaitu suatu media dalam pembelajaran yang mengkolaborasikan mata pelajaran seni dengan pendekatan psikologi. Anak-anak maupun siswa perlu mendapatkan ruang berekspresi agar ia dapat mencurahkan serta meluapkan emosinya pada karya seni yang diciptakannya. Dengan demikian adanya bimbingan dan pendampingan dari seorang guru maupun terapis/psikolog akan mampu mengarahkan dan memotivasi siswa agar memiliki keterampilan dalam pengelolaan emosi. Abstract:The phenomenon of delinquency in students increasingly prevalent during the last few years. Some media both mass media and print media such as newspapers, often reporting student violent events such as brawl between schools that became our common concerns. Cases of violence among students, triggered by mockery, anonymous letters / challenges of fighting, fighting over boyfriends, and also the failure of failure when competing. Bad influences brought by a friend will sometimes spread to gang groups. When this is not immediately addressed will expand and undermine the morale of students. Young people have to do a lot of positive activities, build good relationships among friends and like to greet and forgive each other. One method in overcoming the phenomenon of delinquency in students is the method of art therapy is a media in learning that collaborate art subjects with psychological approach. Children and students need to get a space of expression so that he can pour out and vent his emotions on the artwork he creates. Thus the guidance and mentoring of a teacher or therapist / psychologist will be able to direct and motivate students to have skills in emotional management.
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