Judul: Design and Build Automatic Nutrient Mixing Control System in Drip Irrigation Purwoceng Plant Cultivation System
Abstrak: Purwoceng merupakan tanaman obat asli Indonesia yang tumbuh secara endemik di Dieng, Jawa Tengah. Purwoceng memiliki senyawa yang digunakan pada industri obat. Produksi purwoceng dipengaruhi oleh parameter lingkungan tumbuhnya. Maka dari itu, dalam rangka pelestarian purwoceng, perlu kajian budidaya purwoceng dalam lingkungan terkontrol sehingga purwoceng dapat dibudidayakan secara optimal dan terlindungi dari kepunahan serta membantu ketersediaan bahan baku obat. Penelitian ini bertujuan untuk membuat sistem controlling parameter nutrisi pada tanaman purwoceng dalam plant factory. Purwoceng ditanam dengan tiga kondisi konsentrasi larutan nutrisi yang berbeda yaitu 1000 ppm, 1500 ppm, dan 2000 ppm. Plant factory mampu mengkondisikan lingkungan sesuai kebutuhan purwoceng dengan suhu udara 15–26 °C dan kelembaban udara 60–75%. Luaran yang diharapkan dari penelitian ini adalah hasil uji coba dan ketelitian sistem kontrol otomatis pencampuran nutrisi di plant factory berupa nilai error untuk setiap nilai electricity conductivity yang telah ditentukan., Purwoceng is a native Indonesian medicinal plant that grows endemic in Dieng, Central Java. Purwoceng has compounds used in the drug industry. Purwoceng production is influenced by the environmental parameters of its growth. Therefore, in the context of preserving purwoceng, it is necessary to study the cultivation of purwoceng in a controlled environment so that purwoceng can be cultivated optimally and protected from extinction and help the availability of medicinal raw materials. This study aims to create a system for controlling the nutritional parameters of the. Purwoceng is planted with three conditions nutrient solution concentrations, namely 1000 ppm, 1500 ppm, and 2000 ppm. The plant factory can be conditioning the environment according to Purwoceng's needs with an air temperature of 15–26 °C and air humidity of 60–75%. The expected output of this research is the results of testing and accuracy of the automatic control system for mixing nutrients in factories, the error value for each predetermined electrical conductivity value.
Keyword: electricity conductivity, irigasi tetes, nutrisi, plant factory, purwoceng

Judul: Evaluation of Drip Irrigation Hydroponic System for Cultivation of Purwoceng Plants in A Highland Greenhouse
Abstrak: Populasi purwoceng pada saat ini terbatas di Dataran Tinggi Dieng dan populasinya kian langka. Budidaya tanaman purwoceng di lahan terbuka menghadapi risiko embun beku. Pada penelitian ini, budidaya tanaman purwoceng dilakukan secara hidroponik di dalam greenhouse. Tujuan penelitian ini adalah melakukan analisis statistik dan evaluasi terhadap data sampel tanaman purwoceng yang dibudidayakan menggunakan sistem hidroponik irigasi tetes, untuk mendapatkan sistem hidroponik terbaik pada budidaya tanaman purwoceng. Penelitian menggunakan Rancangan Acak Lengkap (RAL) dengan 2 perlakuan dan 4 kali ulangan. Perlakuan pertama adalah jenis sistem hidroponik irigasi tetes yang meliputi dua taraf yaitu secara non-resirkulasi dan resirkulasi. Perlakuan kedua adalah kepekatan larutan nutrisi yang terdiri dari tiga taraf yaitu 2000 ppm, 1500 ppm, dan 1000 ppm. Hasil penelitian menunjukkan perlakuan irigasi tetes non- resirkulasi dan kepekatan larutan nutrisi 1000 ppm dan 1500 ppm menghasilkan kadar fenolik dan flavonoid akar dan daun tertinggi. Sistem irigasi tetes non- resirkulasi memungkinkan tanaman purwoceng tumbuh lebih baik dibandingkan sistem irigasi tetes resirkulasi. Hal ini dibuktikan dengan rata-rata jumlah daun dan jumlah cabang tertinggi ada pada sistem irigasi tetes non-resirkulasi dengan kepekatan larutan nutrisi 1000 ppm dan 1500 ppm., The population of purwoceng is currently limited to the Dieng Plateau and the population is increasingly scarce. Purwoceng cultivation in open fields faces the risk of frost. In this study, purwoceng cultivation was carried out hydroponically in a greenhouse. The purpose of this study was to perform statistical analysis and evaluation to sample data of purwoceng plants cultivated using drip irrigation hydroponic systems, to obtain the best hydroponic system for purwoceng cultivation. The study used a completely randomized design (CRD) with 2 treatments and 4 replications. The first treatment was a type of drip irrigation hydroponic system which included non-recirculating and recirculation. The second treatment was the concentration of the nutrient solution which included 2000 ppm, 1500 ppm, and 1000 ppm. The results showed that non-recirculating drip irrigation and nutrient solution concentrations of 1000 ppm and 1500 ppm resulted the highest phenolic and flavonoid levels in roots and leaves. The non-recirculating drip irrigation system allows purwoceng plants to grow better than the recirculating drip irrigation system. This was indicated by the average number of leaves and the highest number of branches in the non-recirculating drip irrigation system with nutrient solution concentrations of 1000 ppm and 1500 ppm.
Keyword: purwoceng, greenhouse, hydroponic system, drip irrigation

Judul: Pemodelan Harga Saham Menggunakan Model Lévy dan Model Black-Scholes
Abstrak: Stock may produce high profits. However, it has a high risk as well, because the stock prices fluctuate over time. Therefore, a model is required to estimate the future stock prices accurately. In this paper, Lévy model is compared to Black-Scholes model in estimating the stock price at Bank of America Corporation. As a result, it is concluded that the Black-Scholes model is more accurate than Lévy model.
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