Judul: The Influence of Self-Concept and Purchasing Knowledge toward Consumer Vulnerability of E-Commerce Users
Abstrak: Kehadiran e-commerce memberikan banyak kemudahan dalam berbelanja, namun tidak dapat dipungkiri konsumen pun akan dekat dengan kerugian dan kerentanan akibat pelaku usaha atau karena kelemahan konsumen. Penelitian ini bertujuan untuk menganalisis faktor-faktor yang memengaruhi kerentanan konsumen, khususnya untuk pengguna e-commerce. Faktor-faktor tersebut di antaranya yaitu konsep diri dan pengetahuan pembelian dalam penggunaan e-commerce. Desain penelitian yang digunakan adalah cross-sectional study. Pemilihan contoh menggunakan non probability dengan metode self–administered menggunakan kuesioner online. Pengambilan data dilakukan pada bulan Maret 2021 selama tiga minggu. Contoh dalam penelitian ini didapatkan secara voluntary sampling sejumlah 249 orang dengan kriteria pengguna e-commerce yang berusia 18-65 tahun dan pernah mengalami ketidakpuasan dalam berbelanja menggunakan e-commerce. Analisis data menggunakan metode SEM melalui software LISREL 8.80. Hasil penelitian ini menunjukan adanya pengaruh negatif antara konsep diri dengan kerentanan konsumen dan pengetahuan pembelian terhadap konsumen. Konsep diri ditemukan tidak berpengaruh terhadap variabel pengetahuan pembelian., The presence of e-commerce provides a lot of convenience in shopping, but it cannot be denied that consumers will be close to losses and vulnerabilities due to business actors or consumer weaknesses. This study aims to analyze the factors that influence consumer vulnerability, especially for e-commerce users. These factors include self-concept and purchasing knowledge in the use of e-commerce. The research design used was a cross-sectional study. Selection of samples using non-probability with self-administered methods using online questionnaires. Data collection was carried out in March 2021 for three weeks. Examples in this study were obtained by the voluntary sampling of 249 people with the criteria of e-commerce users aged 18-65 years and had experienced dissatisfaction in shopping using e-commerce. Data analysis using SEM method through LISREL 8.80 software. The results of this study indicate a negative influence between self-concept and consumer vulnerability and purchasing knowledge to consumers. Self-concept was found to not affect purchasing knowledge variables.
Keyword: consumer vulnerability, e-commerce, purchasing knowledge, self-concept

Judul: Persepsi manfaat dan risiko dalam perilaku pembelian konsumen online shop
Abstrak: The attendance of the internet is used by marketing person to create a new shopping environtment that is e-commerce. One of real forms of the e-commerce is online shop. The purpose of this research was for analizing an example purchasing behaviour. Design of this research was cross sectional study. The election of research location was done with purposively, those are Kaskus, Facebook Online Shop, and Komunitas Online Shop. The pattern election was performed with purposive way that was the consumer who had shopped fashion, book and electronic. The kind of product was most bought by example that does not work that is fashion, meanwhile the example works that is a book. The frequeny of buying of the two example groups are included in low category. The address of online shop was most visited by example that does not work that was Kaskus, meanwhile the example works thas was Facebook online shop. The expense of online shopping by example that does not work including low category, meanwhile for the example that works including very high category. The payment method is had by the example groups was transfer method. Gotten nine factors that become an independent variable those are sex, age, education, job status, income, life style, benefit perception, risk perception, and online searching. Sex, income, benefit perception, and online searching variables are significant factors that influence a purchasing behaviour. Keywords: life style, perceived benefit, perceived risk, searching online, evaluation alternative and purchased behaviour.
Keyword: Persepsi manfaat, Persepsi risiko, Pencarian online, Gaya hidup, Evaluasi informasi, Perilaku pembelian

Judul: Hydrothermal Synthesis of Biphasic Calcium Posphate
Abstrak: Biphasio calsium phosphate (BCP), which was a mixture of hydroxypatite (HA) and tricalcium phosphate (TCP), was synthesized by hydrothermal method followed by sintering process. Hydroxyapatite was produced by using natural calcium source CaO from hen's eggshell and (NH4)2HPO4 as phosphate souce, other hydroxyapatite sample was produce by using synthetic calcium source Ca(OH) and H3PO4 as phosphate source.
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