State University of Semarang

About: State University of Semarang is a education organization based out in Semarang, Indonesia. It is known for research contribution in the topics: Population & Curriculum. The organization has 7737 authors who have published 7790 publications receiving 38055 citations. The organization is also known as: Universitas Negeri Semarang.

NGSS-oriented chemistry test instruments: Validity and reliability analysis with the Rasch model

Abstract: The instrument of measuring test attributes must be valid and reliable. This study was carried out since the validity and reliability testing of the chemistry items used by the testee is necessary. This study aims to estimate the validity and determine the reliability of chemical test instruments oriented Next Generation Science Standards (NGSS). The research was conducted through a quantitative descriptive approach in two vocational schools of engineering program which had 130 testees. The instrument used was an NGSS-oriented chemistry test instrument containing 35 items and an expert validation questionnaire. The obtained test participant's response from the test instrument was collected through the documentation method. Item in NGSS test were presented to three subject matters experts. The validities used were the content validity and the construct validity. The reliability was tested through internal consistency and interrater consistency approaches. The results show that content validity (Aiken’s V) is at a range of 0.50 to 1.00. The value of the unexplained variance is less than 10%, which means that it is well-categorized. This analysis is strengthened by CFA which has a goodness of fit and a good measurement model fit. The parameters used to test model fit are CFI, NFI, RMSEA and the value of loading factor. Some results values are over 0.90 and RMSEA is 0.00 and more than 0.3 of loading factor value on each item. All scales had alpha reliability more than the criteria of 0.70. Thus, the developed chemical test item were proven as valid and reliable instruments.

Pengembangan modul ipa terpadu bervisi sets (science, environment, technology, and society) pada tema ekosistem

Abstract: Hasil observasi di SMP Negeri 2 Pucakwangi menunjukkan bahwa pembelajaran IPA belum dilaksanakan secara terpadu Diantara penyebab para guru belum membelajarkan IPA secara terpadu adalah belum tersedianya bahan ajar terpadu, artinya bahan ajar IPA yang digunakan belum membahas materi dari aspek fisika, kimia, dan� biologi Bahan ajar adalah bahan (materi) yang digunakan guru atau siswa dalam pembelajaran, salah satunya berupa modul Pada penelitian ini dikembangkan modul tema ekosistem dengan menerapkan pendekatan SETS (Science, Environment, Technology, and Society) Penelitian ini bertujuan untuk mengetahui apakah modul IPA terpadu bervisi SETS pada tema ekosistem yang dikembangkan layak digunakan sebagai bahan ajar di SMP Desain yang diterapkan dalam penelitian ini adalah penelitian dan pengembangan (Research and Development ) Penelitian dilakukan melalui tahap penelitian dan pengumpulan data, perencanaan, pengembangan produk, validasi, revisi, dan tahap uji coba Subyek penelitian adalah siswa kelas VII Hasil penilaian pakar terhadap modul yang dikembangkan mencapai 88,34%, tanggapan siswa mencapai 99,47% dan semua siswa (100%) telah mencapai Kriteria Ketuntasan Minimal yang ditetapkan (75) Dengan demikian dapat disimpulkan bahwa modul yang dikembangkan memenuhi syarat kelayakan sebagai bahan ajar � The observation results in SMP Negeri 2 Pucakwangi showed that the integrated science learning has not been applied The reason of the teacher had not taught the integrated science was the unavailability of an integrated teaching materials, it means that science teaching material �had not discussed the material in the aspects� of physics, chemistry, and biology Teaching materials are materials used by teachers or students in the learning process, one of them is in the form of module In this research, it is developed modules with topic of ecosystem by applying Science, Environment, Technology, and Society (SETS) approach This research aims to determine whether the modules which has developed decent used as teaching materials in junior high school The research design applied in this research is a Research and Development (R&D) The research was done through research step and data collection, planning, development of product, validation, revision, and testing stage The subject of research was the students of class VII The expert judgment result of integrated science modules was developed reached 88,34%, student responses reached 9947% and all students (100%) has reached the minimum mastery criteria set (75) It can be concluded that the developed modules meet the eligibility requirements as teaching materials � �

Analisis tindak tutur ekspresif dalam wacana stand up comedy indonesia sesi 3 babe cabita di kompas tv

Abstract: Expressive speech act is a type of speech act that states something that is felt by the speaker. This research is a descriptive study which in the end result tries to describe the object in accordance with the existing picture. This research uses a qualitative approach by applying descriptive qualitative methods. The data of this research is in the form of discourse Babe Cabita Stand Up Comedy Indonesia session 3 on Kompas Tv with Youtube page source, humorous speech acts used by the speaker to express things intended to be conveyed to the speech partners in this case is the audience. which is to be achieved to analyze expressive or evaluative speech acts in the Stand Up Comedy Indonesia discourse session 3 Babe Cabita in Kompas Tv. The results of the research show that there are several types of expressive or evaluative speech acts. In this study, the results of four types of expressive speech acts in humorous Indonesian Stand Up Comedy discourse session 3 Babe Cabita in Kompas Tv, namely: (1) expressive speech acts criticize, (2) expressive speech acts complaining, (3) expressive speech acts praise, (4) expressive speech acts of blame, and (5) speech acts of derogatory expressions. It is expected that the results of this study can be useful for readers who want to find references and for learning research in terms of pragmatic science, especially regarding expressive speech acts in subsequent research .

Preparation of activated carbon from banana peel waste for reducing air pollutant from motorcycle muffler

Abstract: The exhaust gas or emission from motor vehicle contains various pollutants and some of them are toxic and very harmful for human health. In the present work, we prepared an activated carbon to reduce the toxic pollutants (via adsorption process) from the exhaust gas of the motor vehicle (particularly motorcycle in this work). The activated carbon was prepared from local banana peel which considered as an agricultural waste without economic value. To prepare the activated carbon, banana peel was carbonized using furnace at 500°C. Then the resulted carbon was activated using chemical activation with ZnCl 2 and physical activation with either microwave (300 W) or furnace (700°C). The prepared activated carbon was then characterized using Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FT-IR) analysis. The SEM result showed that the pore of microwave induced ZnCl 2 activated carbon (AC M ) was larger than the pore of virgin char/carbon and furnace induced ZnCl 2 activataed carbon (AC F ). The FT-IR spectrum of AC M showed some peaks at 3408.59 cm -1 , 1589.25 cm -1 , and 1093.63 cm -1 . They are assigned to O-H stretching, C=O stretching, and C-OH stretching. Additionally, the adsorption performance of the prepared activation carbon to reduce the pollutants concentration (i.e. CO and CH) from the exhaust gas of motor vehicle was investigated. The results showed that the activated carbon induced by microwave and ZnCl 2 activation (ACM) gave the best result. The adsorption or removal efficiency of gas CO reached approximately 97.64 %vol.

Teacher’s and student’s perceptions of corrective feedback in teaching speaking

Abstract: The purposes of this study were to find out the types of the spoken errors commonly made by the students in speaking, knowing the reasons do the students make same errors, describing how English teachers use corrective feedback to refine students’ errors, exploring the types of corrective feedback do the students mostly like, explaining the teachers’ and students’ perceptions towards corrective feedback.The types of this study was descriptive qualitative study. The findings indicated that errors mostly made by the students were pronunciation error, grammatical error and lexical error, why did they make same errors because the students got fossilization, corrcetive feedbacks were used to refine students speaking were explicit correction, repetition and reformulation, corrective feedbacks that the students mostly like were explicit correction, repetition and pronunciation, the teachers perceptions towards corrective feedback were corrective feedback was to know the lacks of the students speaking, the teachers could give the students feedbacks in order not to be fossilized. by giving feedback appropraitely it was believed the students would not be fossilized. The students’ perceptionson corrective feedback were they had very good responses about corrective feedback that were given by the teachers in the classroom.