Judul: Hubungan antara Kadar Zn, Se, dan Co pada Rambut Siswa Sekolah Dasar dengan Pendapatan Orang Tua
Abstrak: Zinc, selenium, and cobalt are an essential microelements required for the children. The quality of food consumed by the students related to their parents income. The purpose of this research was to observe the relationship between the concentration of Zn, Se, and Co in hair elementary school and their parents income. The analysis of Zn, Se, and Co has been determined by atomic absorption spectroscopy method ( Keywords : microelement, hair, AAS). The research data was processed by one way ANOVA analysis. The ranges in concentrations of Zn, Se, and Co was 111.4 to 747.8 ppm, 0.092 to 1.22 ppm, and 7.64 to 15.29 ppm, respectively. Of the elements studied Zn was found to have the highest concentration and Se the lowest. The average concentration of Zn in girl’s hair about four times (626.8 ppm) higher than boy’s hair (146.8 ppm). The highest concentration of Se was found in boy’s hair from low-income parents but in girl’s hair from high-income parents.
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Judul: Korelasi unsur runut kobalt (Co), zink (Zn), dan besi (Fe) pada rambut dengan tingkat kecerdasan siswa SMPN 2 Cipeucang, Pandeglang
Abstrak: Inorganic compounds contained in the human body could form different types of elements in a very small number called trace elements. Related to intelligence of children could be seen that the trace element is essential for human health. Lack of nutrients could lead to inhibit brain development and lower intelligence. Hair analysis provides a wealth of information about health and trace element status of the human body. This research aims to identify, correlate, and compare the trace element that cobalt (Co), zinc (Zn), and iron (Fe) of student’s hair to their intelligence level at SMPN 2 Cipeucang, Pandeglang which performed on the eighth grade students aged 14-15 years. The analysis of trace elements in student’s hair by neutron activation analysis (NAA) has been investigated. The results showed that the average concentration of Co, Zn and Fe was 442.6±19.4 μg/g, 502.6±18.3 μg/g, and 77.0±16.3 μg/g, respectively. Statistical analysis showed that there was a negative correlation between the concentration of Co with student’s intelligence for the nonscience students, while the concentration of Zn and Fe had a positive correlation to intelligence for the science students, but both Zn and Fe were influenced by the sex nonscience factor’s.
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Judul: Karakteristik lompatan hidrolik terhadap pelimpah terjunan pada saluran segi empat
Abstrak: Aliran dengan kecepatan tinggi dalam kondisi superkritis yang melintasi bangunan pelimpah, sebelum bergerak lebih jauh ke arah hilir saluran dimana bilangan Froude (F) lebih besar dari satu harus diubah menjadi aliran subkritis dimana bilangan Froudenya lebih kecil dari satu. Aliran yang meninggalkan kaki pelimpah merupakan aliran yang memiliki kandungan energi yang amat berarti sehingga dapat menimbulkan pengikisan yang besar. Pengubahan bilangan Froude dari kondisi superkritis ke subkritis dimaksudkan agar terjadi perubahan kandungan energi, sehingga aliran menjadi non erosive. Agar daya erosive aliran dapat berkurang, maka biasanya pada bagian hilir dari bangunan pelimpah dibuatkan suatu bangunan peredam energi. Erosi yang terjadi di hilir bangunan pelimpah dapat disebabkan dari keberadaan bangunan pelimpah itu sendiri, maupun bangunan peredam energi yang kurang tepat. Hal ini terutama menyangkut beberapa kejadian lompatan hidrolik yang timbul pada bangunan peredam energi tersebut.. Suatu metode yang efektif untuk menjamin bahwa lompatan hidrolik selalu terjadi pada daerah yang dilindungi, adalah dengan menggunakan bangunan peredam energi yang terdiri dari beberapa tipe dengan..dst
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