STUDI OPTIMASI PENENTUAN Cu(II) DENGAN MENGGUNAKAN KALKON SEBAGAI PENGOMPLEK SECARA VOLTAMMETRI STRIPPING ADSORPTIF (AdSV)

 ABSTRACT The research about determination of Cu(II) by adsorptive stripping voltammetry (AdSV) was conducted. AdSV method was applied to the determination of copper in ultra trace concentration. The parameters of ligand, accumulation potential, accumulation time, pH and ligand concentration was studied. Calcon was found as complexing agent that give the highest peak current. The optimum condition are accumulation potential -0,7 V, accumulation time 60 s, pH 10, and calcon concentration 0.12 mM. The relative standar deviation (n=8) at 10 µg/L standard concentration were obtained 4,27 %. This method was applied to determination of Cu(II) in sample from Batang Air Dingin, Lubuk Minturun and Muara Padang. The sample concentration were 4,778 µg/L and 5,189 µg/L for Batang Air Dingin and Muara Padang, respectively. The recovery of this method was studied for sample from Muara Padang and 98,31 % was obtained. Key words :   Adsorptive, Stripping, Voltammetry, Calcon and Copper   

Implementasi Aplikasi Pembelajaran Matematika Bangun Datar Bagi Siswa Sekolah Dasar Berbasis Android

Mathematics is the study of quantity, structure, geometry, and changes to a number. Math comes from the Greek, which Mathematikos which means an exact science. In the Dutch language of mathematics called as Wiskunde which means the science of learning. Mathematics is a science that is widely used in everyday life. Either generally or specifically. In general, mathematics is used in the trade transaction, carpentry and others. Almost every aspect of the life of mathematics can be applied. Therefore mathematics dubbed as the queen of all sciences. Math also has many advantages over other sciences. In addition to its flexible and dynamic, mathematics can always keep pace with the times. Especially in the present when everything can be done with a computer. Mathematics became one language programs effectively and efficiently. Mathematics is a compulsory subject for primary school students. Elementary school students often have difficulty in studying mathematics, especially in memorizing formulas. The material presented is usually in the form of a conventional, such as textbooks. In Mathematics Learning Application Geometry Two Dimensional Based Android, automatically the application can be run through the medium of mobile phones. This learning app designed using object-oriented modeling, using UML diagrams such, Use Case diagram, activity diagram, sequence diagram and Class diagram. Applications are also made using the programming language Java (J2ME

PENGEMBANGAN BAHAN AJAR MENULIS PUISI DENGAN MEDIA ARTIKEL TEKS DESKRIPSI BERBASIS BOOK CREATOR PADA SISWA MA

Writing is a language skill that is used to communicate indirectly. Poetry is a written literary work that is used as an expression of emotions, imagination, thoughts, rhythms, ideas, messages, word order, figurative words, and feelings. The purpose of this research is to develop teaching materials for writing poetry with the media of descriptive text articles based on Book Creator for students, as well as to determine the validity and feasibility of teaching materials. This study uses Research and development methods using 7 research steps. The research was conducted in MA and the research subjects were MA students in class X. After that, product validation was carried out to material, language, and media experts. In the validation, it got an average value of 4.27 with the criteria of "Very Good". The results of the data validation indicate that the product being developed is "Appropriate to Use". After that, the researcher conducted a trial using SPSS to see the effectiveness of the product by conducting an n-gain test in one class with an average n-gain value of 0.5 which was included in the "Medium" criteria. The results of the study indicate that the e-module using descriptive text articles based on the book creator is feasible and effective to improve students' understanding in learning to write poetry. The average score in the pre-test was 50.37, while the post-test was 77, which proves the increase in students' understanding.   Keywords: writing poetry, descriptive text, book creato

STRUKTUR KEPRIBADIAN KONFLIK BATIN TOKOH PING PADA NOVEL RAPIJALI KARYA DEE LESTARI (PSIKOANALISIS SIGMUND FREUD)

The personality structure is a stage of the soul's life which has three levels, namely conscious, preconscious, and unconscious. The conscious level which contains all the things we pay attention to is certain and only a small part of the mental flicker enters consciousness. Preconscious is memory that is ready or as a bridge between remembering events that have passed. Unconscious is the deepest part or the most important part in humans. Inner conflict is a conflict caused by the existence of two or more ideas, or a conflicting desire to control oneself so that it affects oneself, or it can often occur due to something related to physical and self-contradictory conflicts. Characters are actors or actors who experience events and problems in a story or fiction so that it can be an interesting story. There are three characters namely antagonist, protagonist and tritagonist. The antagonist is an evil character, the protagonist is a good character, and the antagonist is also known as a supporting character. Novel is a long fiction story and contains a series of stories of a person's life with those around him by highlighting the character or nature of the actor, or it can be a long prose essay containing a series of stories of human life and the surrounding community. &nbsp

Implementasi Aplikasi Pembelajaran Matematika Bangun Datar Bagi Siswa Sekolah Dasar Berbasis Android

Mathematics is the study of quantity, structure, geometry, and changes to a number. Math comes from the Greek, which Mathematikos which means an exact science. In the Dutch language of mathematics called as Wiskunde which means the science of learning. Mathematics is a science that is widely used in everyday life. Either generally or specifically. In general, mathematics is used in the trade transaction, carpentry and others. Almost every aspect of the life of mathematics can be applied. Therefore mathematics dubbed as the queen of all sciences. Math also has many advantages over other sciences. In addition to its flexible and dynamic, mathematics can always keep pace with the times. Especially in the present when everything can be done with a computer. Mathematics became one language programs effectively and efficiently. Mathematics is a compulsory subject for primary school students. Elementary school students often have difficulty in studying mathematics, especially in memorizing formulas. The material presented is usually in the form of a conventional, such as textbooks. In Mathematics Learning Application Geometry Two Dimensional Based Android, automatically the application can be run through the medium of mobile phones. This learning app designed using object-oriented modeling, using UML diagrams such, Use Case diagram, activity diagram, sequence diagram and Class diagram. Applications are also made using the programming language Java (J2ME