The purpose of this research was to develop a valid, practice and effective a bilingual scientific-worksheet of the indefinite integrals. This research is development research with 1) Preliminary investigation phase, 2) Prototyping phase, 3) Assessment phase. Data were collected from test and questionnaire and analyzed to examine validity, practicality, and effectiveness the worksheet. The result of this research was producing bilingual scientific-worksheet of indefinite integral materials that oriented for learning achievement improvement. The validity obtained content, language, and illustration from expert judgment. The practicality was on the relation, attention, belief, and student satisfaction. The effectiveness based on the result of achievement test on indefinite integral.

Abstract:Indonesian is the most widely spoken language in Indonesia. More than 200 million people speak the language as a first language. However, acoustic study on Indonesian learners of English (ILE) production remains untouched. The purpose of this measurement is to examine the influence of first language (L1) on English vowels production as a second language (L2). Based on perceptual magnet hypothesis (PMH), ILE were predicted to produce close sounds to L1 English where the vowels are similar to Indonesian vowels. Acoustic analysis was conducted to measure the formant frequencies. This study involved five males of Indonesian speakers aged between 20-25 years old. The data of British English native speakers were taken from previous study by Hawkins & Midgley (2005). The result illustrates that the first formant frequencies (F1) which correlates to the vowel hight of Indonesian Learners of English were significantly different from the corresponding frequencies of British English vowels. Surprisingly, the significant differences in second formant (F2) of ILE were only in the production of /ɑ, ɒ, ɔ/ in which /ɑ/=p 0.002, /ɒ/ =p 0,001, /ɔ/ =p 0,03. The vowel space area of ILE was slightly less spacious than the native speakers. This study is expected to shed light in English language teaching particularly as a foreign language.

This research aims to map out teachers‟ beliefs about, perceptions of, and classroompractices emphasizing English as the medium instruction towards STEM education. Thisstudy addresses the following research questions: (1) what are teachers‟ beliefs on applyingEnglish as the medium instruction through STEM subjects in elementary school? (2) Howdoes English as medium instruction impacts STEM subjects for elementary school? (3)What do teachers identify as challenges and barriers to use English as medium instructionin teaching STEM subjects? Moreover, this research determined as the first step to designpre-service teacher to teach STEM disciplines subjects emphasizing English as the mediuminstruction. A multi-case case study was conducted with two elementary school teachers.These two teachers were purposefully selected from a Cambridge Standard School torepresent science, mathematics, and as English teachers as well. Data collection consists ofdocument analysis, classroom observations, and interviews. Triangulation was used tovalidate the data. Data were analyzed using the constant comparative method. Findingsfrom the case studies are (1) teachers‟ beliefs influence their professional coursework,classroom practices, and how they perceived future education, (2) as the medium ofinstruction changes the classroom gets more interactive and students have fun in learning,(3) new vocabularies that students have not known and matched approach were two bigbarriers for teachers.

Generally, word stress tends to be ignored and is not considered a serious problem in Indonesian EFL; most teachers only focus on lexical and grammatical aspects of English. In fact, the prosodic features existing in English greatly affect meaning. This research, therefore, is intended to find out how Indonesian Learners of English (ILE) produce the English word stress. The stressed syllables were identified by using the highest pitch in each word. This research involved 20 respondents whose mother tongue is Indonesian. PRAAT software was applied to analyze the recordings, including measuring the pitch of each word. Word stress is indicated by the highest pitch of each word. The lowest pitch indicates weak stress. The result illustrated that ILE produces inappropriate word stress in second language learning. Most of them are not able to distinguish between strong and weak stressed syllables. This is because in their native language, prosodic features, such as word stress, do not prevail. Thus, English word stress production was heavily influenced by Indonesian features of stress. From the 36 words that become the instrument of this research, less than 50% were pronounced correctly, in most cases, and the highest pitch fell on last syllables. The absence of prosodic features in Indonesian language and limited knowledge on English phonetics drive the ILE to pronunciation error.�

This research is aimed at finding and describing the intonation of English declarative sentence produced by English Department students of Universitas PGRI Yogyakarta. The intonation is analyzed based on contour approach through the movements of pitch. The researcher uses three students as his respondents. The data are analized through three steps, firstly, data are collected through listening and recording process, secondly, the recording data are converted to soundwave and pitch diagrams using PRAAT software, at this point, PRAAT text grid is applied to make the pitch diagrams easy to understand, and finally, the researcher draws conclusion according to the contour of pitch in the diagrams. The result of this research illustrates that the respondents tend to rise the pitch at end of English declarative sentence which correspondingly changes the mood of the sentence into an interrogrative sentence. English declarative sentences generally have falling intonation and native speakers of English do not rise the pitch at the end of declarative sentences. However, this research shows that students of English have inadequate knowledge about suprasegmental features in English particularly intonation.