Judul: The Influence of Social Support and Mother-Child Communication on Teenager's Self Concept
Abstrak: The Covid-19 pandemic presents new challenges for families and children, including teenagers. Teenager is one of the important phases to find the identity. The pandemic condition that make everything done in a limited way affect teenagers in forming their self-concept. This study aims to analyze the effect of social support and mother-child communication on teenager’s self-concept during the Covid-19 pandemic. Respondents in this study amounted 202 junior/senior high school teenagers who were undergoing distance learning and had complete parents. Sampling used voluntary sampling technique. The results shows that during the Covid-19 pandemic, boys tend to have a significantly higher self-concept than girls. Parent support, peer support, and teacher support has a significant positive correlation with mother-child communication and teenager’s self-concept; likewise, mother-child communication and teenager’s self-concept also has significantly positive correlation. Social support and mother-child communication consistently also have a significant positive influence on teenager’s self-concept from the regression model., Pandemi Covid-19 menghadirkan permasalahan baru bagi keluarga dan juga anak, termasuk anak remaja. Periode remaja merupakan salah satu fase penting dalam mencari identitas dirinya. Kondisi pandemi yang membuat segala sesuatu dilakukan secara terbatas tentu saja akan memengaruhi remaja dalam membentuk konsep dirinya. Penelitian ini bertujuan untuk menganalisis pengaruh dukungan sosial dan komunikasi ibu-anak terhadap konsep diri remaja di masa pandemi Covid-19. Responden dalam penelitian ini berjumlah 202 remaja SMP/SMA yang sedang menjalani pembelajaran jarak jauh dan memiliki orang tua lengkap. Pengambilan contoh menggunakan teknik voluntary sampling. Hasil penelitian menunjukkan bahwa selama pandemi Covid-19, remaja laki-laki cenderung memiliki konsep diri yang lebih tinggi secara signifikan dibandingkan remaja perempuan. Dukungan orang tua, teman, dan guru berhubungan positif signifikan dengan komunikasi ibu-anak dan konsep diri remaja; begitupun komunikasi ibu-anak dengan konsep diri remaja juga ditemukan berhubungan positif signifikan. Dukungan sosial dan komunikasi ibu-anak secara konsisten juga berpengaruh positif signifikan terhadap konsep diri remaja dalam model regresi yang dihasilkan.
Keyword: social support, mother-child communication, self-concept, Covid-19 pandemic, teenage

Judul: The Effect of Parenting Style and Parental Expectation on Adolescent Self-Concept
Abstrak: Konsep diri yang rendah dapat menunjukkan konsep diri negatif pada remaja dan menjadi faktor penyebab seseorang mengalami berbagai gangguan perilaku dalam perkembangannya. Penelitian ini bertujuan untuk menganalisis hubungan dan pengaruh gaya pengasuhan serta harapan orang tua terhadap konsep diri remaja. Penelitian ini melibatkan 252 responden remaja usia SMA di Indonesia. Penelitian ini menggunakan desain cross-sectional dengan metode voluntary sampling yang dilakukan secara online. Hasil uji korelasi menunjukkan bahwa gaya pengasuhan otoritatif berhubungan positif signifikan dengan konsep diri remaja, sementara gaya pengasuhan otoriter dan permisif berhubungan negatif signifikan dengan konsep diri remaja. Hasil uji regresi menunjukkan bahwa jenis kelamin dan gaya pengasuhan permisif berpengaruh negatif signifikan terhadap konsep diri remaja. Dalam hal ini, laki-laki mempunyai konsep diri yang lebih rendah dibandingkan perempuan. Remaja dengan konsep diri sedang masih perlu meningkatkan konsep diri yang lebih positif agar memiliki kepribadian dan pandangan yang baik terhadap dirinya sendiri. Selain itu, gaya pengasuhan otoritatif orang tua juga perlu ditingkatkan untuk mendukung konsep diri remaja yang lebih baik., A low self-concept can indicate a negative self-concept in adolescents which is a factor causing a person to experience various behavioral disorders in their development. This study aims to analyze the relationship and influence of parenting style and parents' expectations on adolescent self-concept. This research involved 252 respondents of high school age in Indonesia. This study used a cross-sectional design with a voluntary sampling method which was carried out online. Correlation test results show that authoritative parenting style had a significant positive relationship while authoritarian and permissive parenting styles had a significant negative relationship with adolescent self-concept. The results of the regression test showed that sex and permissive parenting style had a significant negative effect on adolescent self-concept. In this case, men had a lower self-concept than women. Adolescents with a moderate self-concept still need to improve a more positive self-concept in order to have a good personality and view of themselves. In addition, parents' authoritative parenting style also needs to be improved to support better adolescent self-concepts.
Keyword: adolescent, parental expectation, parenting style, self-concept

Judul: Rancang Bangun Elemen Pemanas Bahan Bakar Minyak Nyamplung Untuk Motor Bakar Diesel dengan Memanfaatkan Panas Gas Buang
Abstrak: Tamanu oil is one of biosolar substituter as diesel engine fuel. High viscosity of tamanu oil becomes main obstacle in direct using of tamanu oil as diesel engine fuel. Heater element is made to decrease tamanu oil viscosity. Heater element is benefitted high temperature of diesel engine exhaust gas as reheating source. Optimum temperature which is needed to reduce tamanu oil viscosity of 3-5 cSt is 110 Celcius degree (biosolar viscosity of 30oC is 5-7 cSt). IV design of element heater has optimum tamanu oil reheating. There are four kind of tamanu oil that has different treatment. degumming neutralization (N4) tamanu oil has best quality with the lowest viscosity of 30cSt in 30oC. Tamanu oil (N4) usage as fuel occur reduction power of 12.26 %, torsion of 9.59 %, power maximum of diesel engine is 5.39 kW and maximum torsion of 123.74 Nm. Maximum power of diesel engine using biosolar is 5.99 kW and maximum torsion of 144.53 Nm. But then, tamanu oil can replace biosolar (fossil energy), without made as biodiesel first and mixed with biosolar.
Keyword: