Telah dilakukan pembuatan prototype sistem lampu penerangan jalan otomatis menggunakan sensor arduino. Proyek ini bertujuan untuk mengembangkan kontrol penerangan jalan umum yang dapat bekerja secara otomatis dan dapat menghemat pemakaian listrik. Dalam proyek akhir ini sensor yang digunakan adalah sensor LDR (Light Dependent Resistor) yang digunakan sebagai pendeteksi adanya cahaya pada tempat tersebut. Sensor LDR akan mengatur cahaya dari lampu sesuai dengan cahaya yang diterima oleh sensor LDR. Untuk mengatur cahaya dari lampu menggunakan rangkaian yang dikendalikan oleh Arduino Uno. Pada kegiatan yang telah dilakukan diperoleh lampu penerangan yang dapat bekerja secara otomatis, pada saat keadaan sekitar dalam keadan gelap (malam) maka lampu penerangan menyala, dan sebaliknya ketika keadaan sekitar terang (siang) maka lampu akan mati secara otomatis. Hal ini berarti sensor cahaya bekerja dengan baik.
Fiqh of four madhab (Hanafi, Maliki, Shafi'i and Hambali) permit the marriage of minors, so that parents tend to marry their children at an underage. This ppinion is criticized in modern times who want a minimum age of marriage. The question arises how the interpretation of the four madhab (Islamic jurisprudence) of thought is used and are there other arguments that can be used in reinterpreting the existence of a minimum age of marriage. This study uses some methods, firstly, to examine the verses and hadith to find out whether there are cues about the minimum age of marriage or not. Secondly, to reinterpret using the ta‘liliyyah method and the termiyyah of the arguments used by the religious and contemporary scholars. The result shows that the madhab declares Surah al-Thalaq as the proposition regarding the ability of marriages of young children. According to the author, the logic is incorrect because there is no need to iddah for virgin women contained in Surah al-Ahzhab verse 49; The religious scholars also use it as the proposition of the Prophet's marriage hadith. with ‘Aisha r.a when she was a child, even though this incident occurred in Mecca before the Muslim period and before the hadith about the guardian's obligation to ask permission for a girl or widow. This study also finds other verses that can be used as arguments in limiting the age of marriage, namely Surat al-Nisa 'verses 5-6 and 9, the hadith of Ibn Mas'ud and maslahah to be achieved from a marriage, which explicitly states that both adult and maturity both physically and mentally as a condition of marriage.
Kehidupan manusia tidak terlepas dari sampah dalam menjalani kehidupan sehari-hari. Untuk itu, jika sampah plastik tersebut tidak dikelola dengan baik, makan akan menghasilkan dampak negatif bagi kesehatan dan lingkungan. Untuk itu, artikel ini bertujuan untuk memberikan edukasi kepada masyarakat desa Alue Lhok sebagai solusi untuk mengatasi permasalahan tersebut dengan mengolah sampah plastik menjadi suatu karya yang mempunyai nilai guna dan nilai jual menjadi Ecobrick. Adapun metode yang digunakan untuk mengolah sampah plastik menjadi ecobrick (bangku) diantaranya: mengumpulkan sampah plastik dengan ketentuan tertentu, dicuci, dikeringkan atau dijemur, mengisi botol dengan sampah plastik, supaya padat isian sampah plastik ditekan menggunakan kayu, dan dirakit membentuk suatu karya menggunakan bantuan lakban. Tahap selanjutnya, botol yang sudah dirakit berbentuk bangku dilapisi busa dan diberikan sarung. Hasil dari kegiatan ini mendapatkan respon yang baik di kalangan masyarakat Alue Lhok, selain dapat mengatasi pencemaran lingkungan, juga menambah wawasan masyarakat dalam mengelola sampah plastik, serta menambah sumber pendapatan masyarakat setempat dengan memanfaatkan sampah plastik sebagai bahan utama dalam pembuatan ecobrick bangku.
This research aims to produce authentic assessment instruments that are comprehensively packaged for students in primary schools. The subjects of this research are: (1) teachers; (2)students; and (3) seven expert validators. This research is conducted in fourth grade students of SDN 104202 and 106811 Bandar Setia. The used method is formative research and development focused on two stages, namely the preliminary and formative evaluation stage. The instruments used are expert validation questionnaires. The research results shows that the authentic assessment instrument is valid, has very high reliability, and gets average score of the competence is 88.03 or high categorized. Another finding shows that authentic assessment instruments can helped the teachers in measuring students' competence, namely: attitude, skill and knowledge, and also give the contribution in developing the students' character values.
Climate change has both a direct and indirect effect on surface water quality. One of them is the increase in chemical weathering which causes the release of heavy metals in aquatic sediments. The toxicity of high concentration heavy metals and the phenomenon of algal bloom also become a threat to the freshwater environment. It is known that several types of algae can live, develop, and act as a biosorption agent for various types of heavy metals. The use of algae-based biosorbent also can reduce the level of global warming from the production of commercial adsorbents such as activated carbon. Hence, the objective of this study was to determine the capability of wild algae biomass from the lake Situ Agathis Universitas Indonesia, Depok West Java as a heavy metal biosorbent by elaborating on its biosorption performance, for the benefit of the wastewater treatment and the management of algae bloom. Removal efficiency zinc improved significantly by activation treatment with thermally and base treatments on wild algae biomass. The result from the experimental laboratory showed that the zinc removal up to 92.12% in 120 min by NaOH activation method at neutral pH. The obtained results suggest that the wild algae biomass is a promising benign and low-cost material for industrial wastewater treatment.
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