Judul: Price Forecast and Volatility of Broiler Chicken in West Java
Abstrak: Jawa Barat merupakan provinsi dengan jumlah populasi dan produksi daging ayam ras tertinggi di Indonesia. Hal ini menjadikan Jawa Barat sebagai sentra produksi daging ayam ras. Harga daging ayam ras berfluktuasi setiap saat. Hal ini meresahkan produsen dan konsumen yang menginginkan kestabilan harga. Oleh sebab itu, perlu dirumuskan model peramalan dan tingkat volatilitas harga daging ayam ras di Jawa Barat sehingga produsen dan konsumen dapat melakukan perencanaan produksi dan konsumsi serta pemerintah dapat menjadikan informasi ini untuk menyusun kebijakan. Data yang digunakan berupa data harga mingguan yang dianalisis menggunakan Eviews 9. Model terbaik untuk meramalkan harga daging ayam ras di Jawa Barat adalah SARIMA(1,1,1)(0,1,1)26 . Harga daging ayam ras memiliki pola tren naik dan musiman. Model terbaik untuk mengestimasi volatilitas harga adalah ARCH(1) dengan nilai koefisien sebesar 0,828514. Nilai koefisien yang mendekati satu menunjukkan volatilitas kuat dan sangat responsif terhadap dinamika pasar. Terdapat beberapa hal yang dapat dilakukan untuk meminimalisir fluktuasi harga, seperti memperbaiki dan menambah infrastruktur, memperbaiki sistem informasi dan distribusi, mengkaji ulang kebijakan impor jagung dan jumlah indukan ayam, serta menyediakan cold storage.
Keyword: arch garch, forecasting, price, sarima, volatility

Judul: Analisis Faktor-Faktor yang Memengaruhi Harga Daging Sapi di Jawa Barat
Abstrak: Daging sapi merupakan salah satu komoditas penting bagi masyarakat. Jawa Barat memiliki tingkat konsumsi daging sapi diatas tingkat konsumsi rata-rata nasional, namun harga daging sapi di Jawa Barat hingga saat ini masih mengalami kondisi yang tidak stabil. Kondisi ini akan memberikan dampak negatif bagi para pelaku ekonomi. Tujuan dari penelitian ini adalah menganalisis faktor-faktor apa saja yang memengaruhi harga daging sapi di Jawa Barat. Data yang digunakan adalah data sekunder time series tahun 2003-2020. Metode Error Correction Model (ECM) digunakan dalam penelitian ini. Hasil penelitian menunjukkan bahwa pada jangka panjang variabel harga daging ayam dan harga daging sapi internasional berpengaruh positif dan signifikan terhadap harga daging sapi di Jawa Barat, dan pada jangka pendek variabel populasi sapi potong berpengaruh negatif signifikan terhadap harga daging sapi di Jawa Barat., Beef is one of the most important commodities for the society. Beef consumption rate in West Java is above the national average consumption level, yet the beef prices in West Java still experiencing fluctuations until now. The condition of unstable price could give a negative impact to the economy actors. The purpose of this study is to analyze what factors affect the beef prices in West Java. The data for this study were secondary time series data from 2003 to 2020. Error Correction Model (ECM) method is used in this study. The result of this study showed, in the long term the price of chicken meat and international beef price had a positive and significant effect on the beef price in West Java, and in the short term the population of beef cattle had a negative and significant effect on the beef price in West Java.
Keyword: beef, ECM, price fluctuations, price

Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell