Judul: The Influence of Self-Confidence and Perceived Product Quality on Consumptive Behavior at E-commerce in Generation Z
Abstrak: Kemajuan teknologi saat ini memengaruhi segala aspek kehidupan manusia khususnya dalam hal berbelanja. Penelitian ini bertujuan untuk melihat pengaruh kepercayaan diri dan persepsi kualitas produk terhadap perilaku konsumtif generasi Z yang berbelanja melalui e-commerce. Desain penelitian ini adalah cross-sectional study dan teknik purposive sampling menggunakan kuesioner online dengan jumlah responden 192 orang. Data diolah dan dianalisis menggunakan program Microsoft Excel 2019, Statistical Program for Social Sciences (SPSS) 25, dan SMART-PLS. Hasil menunjukkan tidak terdapat hubungan antara karakteristik responden dengan kepercayaan diri, persepsi kualitas produk, dan perilaku konsumtif. Hasil uji pengaruh menunjukkan bahwa kepercayaan diri berpengaruh positif terhadap persepsi kualitas produk dan berpengaruh negatif terhadap perilaku konsumtif, serta persepsi kualitas produk juga berpengaruh negatif terhadap perilaku konsumtif., Advances in technology today affect all aspects of human life, especially in terms of shopping. This study aims to see the influence of self-confidence and perceived product quality on the consumptive behavior of Generation Z who shop through e-commerce. The design of this study was a cross-sectional study and a purposive sampling technique using an online questionnaire with 192 respondents. Data was processed and analyzed using the Microsoft Excel 2019 program, Statistical Program for Social Sciences (SPSS) 25, and SMART-PLS. The results show that there is no relationship between the characteristics of respondents with self-confidence, perceived product quality, and consumptive behavior. The results of the influence test show that self-confidence has a positive effect on perceived product quality and a negative effect on consumptive behavior, and perceived product quality also has a negative effect on consumptive behavior.
Keyword: consumptive behavior, e-commerce, generation z, perceived product quality, self-confidence, generasi z, kepercayaan diri, persepsi kualitas produk, perilaku konsumtif

Judul: The Effect of Perceived Price and Perceived Quality on Consumer Satisfaction of Brand A Local Cosmetic Products in Generation Z.
Abstrak: Meningkatnya tren berbelanja online perlu diiringi dengan perilaku konsumen yang cerdas saat membeli barang dan jasa dengan mempertimbangkan beberapa hal, dari segi kebutuhan, keinginan, dan yang dapat memberikan kepuasan. Penelitian ini bertujuan untuk menganalisis hubungan dan pengaruh persepsi harga dan persepsi kualitas terhadap kepuasan konsumen produk kosmetik lokal merek A pada generasi Z. Penelitian ini menggunakan menggunakan kuesioner online melalui google form dengan jumlah responden sebanyak 318 orang. Data yang diperoleh diolah menggunakan Microsoft Excel 2013, SPSS, dan LISREL. Hasil uji hubungan menunjukkan bahwa usia dan pendidikan terakhir berhubungan positif dan signifikan terhadap persepsi kualitas. Frekuensi pembelian produk kosmetik lokal merek A juga ditemukan berhubungan positif dan signifikan dengan persepsi harga, persepsi kualitas, dan kepuasan konsumen. Hasil uji pengaruh menunjukkan bahwa persepsi harga berpengaruh positif dan signifikan terhadap persepsi kualitas dan kepuasan konsumen. Persepsi kualitas juga berpengaruh positif dan signifikan terhadap kepuasan konsumen.
Keyword: consumer satisfaction, cosmetic product, generation Z, perceived price, perceived quality

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.
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