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: Volatility Analysis of Broiler Meat and  Chicken Egg Prices in Indonesia
Abstrak: Broiler meat and eggs are ideal and affordable sources of animal protein. Price fluctuations will generate price volatility and affect society. Therefore, the price stability of broiler meat and eggs needs to be anticipated by the government to reduce risks and uncertainties that will harm producers and consumers of broiler meat and eggs. The purpose of this research is to analyze the price volatility of broiler meat and eggs in Indonesia. The data used was producer and consumer price data received from the Strategic Food Pricing Information Center. The research used daily time series data from March 2020 to May 2023. The analytic approach utilized was ARCH- GARCH with Eviews 9 software. The results showed that the best model for broiler meat price volatility were ARCH (2) for producer prices, and ARCH (1) for customer prices. Meanwhile, the best models for the volatility of chicken egg prices were GARCH (1,1) for producer prices and ARCH (1) for consumer prices. The results also show that the price of broiler meat at producers have low volatility, while consumer prices have high volatility. The prices of chicken eggs at both the producer and consumer levels have low volatility., Daging dan telur ayam adalah sumber protein hewani yang ideal dan terjangkau. Fluktuasi perubahan varians harga akan menyebabkan volatilitas harga dan berdampak pada masyarakat. Oleh karena itu, stabilitas harga daging dan telur ayam perlu dilakukan antisipasi oleh pemerintah untuk meminimalisir risiko dan ketidakpastian yang akan merugikan baik produsen maupun konsumen daging dan telur ayam. Penelitian ini bertujuan untuk menganalisis tingkat volatilitas harga daging dan telur ayam ras pada tingkat produsen dan konsumen di Indonesia. Data yang digunakan adalah data harga produsen dan konsumen yang diperoleh dari Pusat Informasi Harga Pangan Strategis. Penelitian menggunakan data time series harian dari Maret 2020 sampai Mei 2023. Metode analisis yang dilakukan adalah Autoregressive Conditional Heteroscedasticity (ARCH)- Generalized Autoregressive Conditional Heteroscedasticity (GARCH) dengan software Eviews 9. Hasil penelitian menunjukkan model terbaik volatilitas harga daging ayam adalah ARCH (2) untuk harga di tingkat produsen, dan ARCH (1) harga di konsumen. Sementara itu, model terbaik volatilitas harga telur ayam adalah GARCH (1,1) untuk harga di tingkat produsen, dan ARCH (1) harga di konsumen. Hasil penelitian juga menunjukkan bahwa harga daging ayam di produsen memiliki volatilitas yang rendah, sedangkan harga konsumen memiliki volatilitas yang tinggi. Harga telur ayam baik di tingkat produsen dan konsumen sama-sama memiliki volatilitas yang rendah.
Keyword: ARCH-GARCH, daging ayam, telur ayam, volatilitas

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