Judul: Pengaruh Isu Lingkungan Kemasan Plastik terhadap Keputusan  Pembelian Produk Air Minum dalam Kemasan (AMDK) di  Wilayah Provinsi DKI Jakarta
Abstrak: Permasalahan sampah plastik telah menjadi isu lingkungan global yang marak disuarakan. Di lain sisi, industri pangan tidak luput dari penggunaan plastik sebagai bahan kemasan termasuk di antaranya adalah penggunaan kemasan plastik pada produk air minum dalam kemasan (AMDK). Maraknya isu lingkungan yang beredar dapat mempengaruhi pola konsumsi dan pola perilaku konsumen. Penelitian ini bertujuan mengetahui pengaruh isu lingkungan terkait kemasan plastik serta kaitannya dengan perilaku konsumen dan pola konsumsi dalam hal ini yaitu keputusan pembelian produk AMDK. Penelitian dilakukan dengan metode survei online (dalam jaringan) dengan teknik pengumpulan data non-probability sampling yaitu convenience sampling. Jumlah responden adalah sebanyak 226 responden yang berdomisili di wilayah Provinsi DKI Jakarta. Adapun analisis data mencakup analisis korelasi Chi Square dan analisis pengaruh lingkungan menggunakan Partial Least Square Structural Equation Modelling (PLS-SEM). Hasil analisis korelasi menunjukkan faktor demografi jenis kelamin berkorelasi terhadap frekuensi pembelian AMDK. Adapun, faktor demografi usia, jenis kelamin, tingkat penghasilan, dan domisili berkorelasi terhadap pengetahuan isu lingkungan. Hasil analisis pengaruh PLS-SEM menunjukkan bahwa pengetahuan isu lingkungan berpengaruh negatif terhadap keputusan pembelian AMDK dengan koefisien determinasi (R2 5,3%) dan nilai effect size sebesar 0,047. Hal ini menunjukkan bahwa isu lingkungan dapat menjadi faktor yang menentukan keputusan pembelian produk AMDK namun hanya sebagai faktor minor dan bukan faktor utama.
Keyword: air minum dalam kemasan (AMDK), isu lingkungan, kemasan plastik, keputusan pembelian, Partial Least Square Structural Equation Modelling (PLS-SEM)

Judul: Analisis Tingkat Kesukaan Konsumen Terhadap  Air Minum Dalam Kemasan (Amdk)
Abstrak: Water is a natural resource that is necessary for the organism at both the plants, animals and even humans. Water is also the natural resources that are important in supporting economic development and social sectors such as industry, power, agriculture, fishery, animal husbandry, transport, tourism and households. Community needs to water at this time has been increasing. This is because the number of people who continue to grow. Growing number of people not accompanied by increased supply of drinking water can cause scarcity (Nurmalina, 2003). It makes business AMDK highly prospective and encourage industry growth AMDK in big cities in Indonesia. Based on the problems faced by the goal to be achieved from this research, namely, analyzing the level of consumers prefer to drink water in the product packaging (AMDK), and identify how the level of loyalty in the consumer packaged drinking water (AMDK). So with the introduction of this research are expected to provide benefits to companies AMDK producers, to consumers and to institutions. This research was conducted in the Village Babakan Raya Darmaga or around campus Darmaga IPB Bogor, in June until November 2008. The variables that are important in this research is the behavior of the community, community characteristics, market stimuli, and other stimuli. The indicators of public attitudes on the decision to purchase a product is the introduction of needs, information search, alternative evaluation, purchase decision and post-purchase behavior. From this research found that the results show that in principle the level of consumers prefer products AMDK is the same, because in principle, a sense of thirst can not be delayed. Level of consumer loyalty to products AMDK not stabilized, this is more due to factors such as availability of product and factor markets in preference to the price offered by the manufacturer AMDK itself. Based on the analysis in this research that there is no significant difference in the level of consumer preferences towards product AMDK tested. This showed in the results tested by the respondent that the test is done with the same information with the test performed without information about the brand of the product. Product purchase decisions based on the availability of more products in the market, the level of preference for the product itself.
Keyword: 

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology