Indonesia is a country that has enormous iron ore and iron sand mine that can be utilized for various industrial purposes. This research has been successfully conducted synthesis and characterization of hematite iron ore and magnetite from iron sand. Iron sand and iron ore that has been crushed manually repaired with a magnet was carried out with the HCl, and NH4OH then dried in the temperature of 150 oC and calcinated at a temperature of 500 oC. Characterization was carried out using X-ray diffraction (XRD) and X-ray fluorescence (XRF), where the preliminary information obtained from XRF results in an iron ore sample by manual separation have 95.99% of Fe2O3 and followed by compounds SiO2 (2.10%). While the iron sand contains 81.42% of Fe3O4 and 2.5% of SiO2. After the precipitation process, Fe2O3 compounds contained in iron ore has a content of 96.58% and Fe3O4 compounds contained in iron sand (86.73%).  The results of XRD indicate the dominant primary phase in iron ore is hematite or Fe2O3, and in iron, sand is magnetite Fe3O4, Before the extraction process, Fe2O3 was 58.009 μm in size and after the process of extracting the particles was reduced to 20.950 μm. While the Fe3O4, prior to the extract, has a grain size of 59.009 μm, and after an extraction process, the grain size reduced into 25.950 μm. The calculation results indicate there is a slight size difference between the grain size of iron sand and iron ore.

Hydrogen is a renewable energy source that can be used as a fuel and as an  alternative to fossil fuels. Solid  storage media in solid form are safer to use than liquid (-253 oC) or gaseous media (700 bar) media. To store hydrogen in a solid medium, it requires a metal able to  interact with hydrogen . Magnesium is one of the metals which  can form metal hybrids based on MgH2 which is capable of  absorbing hydrogen up to  (7.6wt%). However, the reaction kinetics for  magnesium are  very slow, it takes at least 60 minutes to absorb hydrogen and the operating temperature is always  very high (300 oC). Several attempts have been made to add the catalytic converter  and milling time. Hydrogen storage material based on MgH2 with a 10wt%Ni catalyst was  successfully synthesized using a mechanical alloy technique with time variations of 2 hours, 5 hours, and 10 hours. From the results of the X-ray diffraction schema  at a diffraction angle of 2θ=37.87o, it shows the presence of a MgH2 phase, Ni phase is at a diffraction angle of 61.85o, the diffraction peak also shows that there was a  widening of the diffraction peak with increasing milling time, this explains that there was  a reduction in the size of the crystal. When  calculating  with the Schereer method, the crystal size of the material reaches 10 nm. The results of the DSC test indicated  a decrease in temperature of 383 oC in 41 minutes with a milling time of 10 hours.

Product quality is an important factor that affects the level of development and progress of a company. Companies that operate without paying attention to the quality of their products are tantamount to losing hope for the future of the company. The resulting product must always be checked for compliance with the established standards, so that the damage that occurs to the product can be reduced and eliminated. This study aims to analyze the quality control of raw materials using the seven tools method on sweet bread products at UD. Sarigut Bakery Banda Aceh. This research data is primary data obtained by researchers from questions posed to original sources and also observations of researchers at the location directly. The results of the study found that the quality control of raw and supporting materials was not good enough because the company was not able to maintain the quality standards and brands of materials set by using non-standard materials with lower quality levels. As for the feasibility of the storage warehouse, the control is quite good because the arrangement and placement of materials is orderly and the cleanliness of the warehouse and factory is quite well maintained. Disability caused by working hours is R² = 0.1336 or 13.36%. Defects due to long storage of raw materials are R² = 0.7254 or 72.54%. Meanwhile, defects due to the use of non-standard wheat flour raw materials are R² = 0.8621 or 86.21%. Non-standard raw materials are the biggest factor in causing product defects, this is caused by the condition of substitute materials that are not up to standard, which results in high water content in bread. Keywords: Quality control of raw materials, seven tools, sweet bread

Rumah merupakan salah satu tempat ternyaman yang ingin ditinggal oleh penggunanya, karena rumah merupakan tempat peristirahatan setelah melakukan kegiatan di luar rumah. Maka penggunanya pasti menginginkan suasana rumah yang dapat memberikan kenyamanan ‘termal’ ketika berada di dalam bangunan. Untuk mengetahui menggunakan parameter suhu udara, kelembaban, kecepatan angin, radiasi udara, insulasi pakaian, dan metabolic rate yang diperlukan penelitian untuk mengetahui bagaimana kenyamanan termal pada rumah adat Aceh. Penelitian ini bertujuan untuk mengevaluasi pengaruh material terhadap tingkat kenyamanan termal pada rumah tradisional Aceh beratap rumbia dan seng dengan menggunakan metode Predicted Mean Vote (PMV) dan Predicted Percentage of Dissatisfied (PPD), standar SNI, serta melakukan wawancara dengan pemilik rumah untuk mengetahui bagaimana kenyamanan termal tersebut. Hasil analisis kenyamanan termal pada rumah Aceh beratap rumbia menunjukkan bahwa nilai PMV (-0.01)~(-0.49), nilainya berada pada kategori netral dengan nilai PPD berkisar antara 5%~10%. Nilai PMV untuk rumah Aceh beratap seng berkisar antara 0.44~0.96 yang dikategorikan sedikit hangat dengan nilai PPD berkisar antara 11%~40%. Hasil standar SNI  suhu udara dan kecepatan angin pada rumah Aceh atap rumbia memiliki nilai yang sudah memenuhi, kecuali pada kelembaban memiliki nilai yang tidak sesuai dengan standar. Sedangkan rumah material atap seng untuk parameter kelembaban dan kecepatan angin tidak memenuhi standar SNI 03-6572-2001, kecuali suhu udara  yang memiliki nilai  yang memenuhi standar. Hasil wawancara kenyamanan termal pagi pengguna menjelaskan bahwa pemilik rumah hanya merasa nyaman berada di rumah adat Aceh beratap rumbia. Hasil PMV, PPD dan wawancara menunjukkan bahwa kondisi kenyamanan termal pada rumah adat Aceh beratap rumbia nyaman untuk digunakan beraktivitas dibandingkan rumah Aceh beratap seng, sehingga perlu pendingin buatan.

Penelitian ini berjudul ”Keanekaragaman  Jenis Tumbuhan Pekarangan yang terdapat di Kemukiman Lueng Putu Kecamatan Bandar Baru Kabupaten Pidie Jaya”, penelitian ini bertujuan untuk mengetahui keanekaragaman jenis tumbuhan pekarangan di kemukiman Lueng Putu. Penelitian ini menggunakan metode survey Eksploratif dengan metode Simple random sampling. Analisis data ditentukan dengan Indeks Keanekaragaman. Hasil penelitian menunjukkan terdapat 79 jenis tumbuhan yang termasuk kedalam 34 Famili. Indeks keanekaragaman jenis tumbuhan pekarangan yang ditemukan di Kemukiman Lueng Putu tergolong kriteria tinggi yaitu H’=3,465.Kata kunci: Keanekaragaman, Tumbuhan, Pekarangan