Crude Palm Oil (CPO) contains ?-carotene as source of pro-vitamin A. Alternative adsorbent that can be used to adsorb ?-carotene is Palm Oil Fly Ash (POFA). This study aims to determine the ability of POFA activated with H3PO4 and Cu/Zn impregnation to adsorb ?-carotene from CPO to obtain characteristics data of modified POFA and its ability to adsorb ?-carotene. The main materials used were CPO and POFA. The parameters observed were the characterization and performance test of 9% H3PO4-activated POFA produced at various heating times for 90, 150, and 210 minutes with Cu/Zn impregnation. BET analysis showed the POFA with heating time of 90 minutes had the largest surface area of 19.4785 m2/g, XRD showed the presence of CuO, ZnO, quartz, and SiO2 diffraction patterns, FTIR showed that the POFA contained O-H groups, O-H, Si-H, Al-O, asymetric Si-O, and Si-O-Si bending vibrations, and SEM-EDX results showed that POFA has hollow pores and a rough spherical surface. Based on the results of UV-Vis Spectrophotometry analysis, the most optimal result was obtained in the ?-carotene adsorption process with POFA-modified 2 variations of activation heating time for 150 minutes, which succeeded in adsorbing 86% of ?-carotene.

The research in this journal article aims to determine the application of letter management standards in increasing the effectiveness of letter management. Therefore, it is necessary to manage letters well and correctly so that the letters can be well organized and the process of returning letters can be carried out effectively and efficiently. It is hoped that effective mail management can be carried out by the relevant staff in managing mail, both for incoming and outgoing mail. So, in researching this journal article, it can be seen that the application of letter management standards in increasing management effectiveness, that the management of incoming mail is divided into six stages which are important to know, namely: receiving letters, sorting letters, directing letters, recording letters, distributing letters and storing letters. Meanwhile, for managing outgoing letters, there are also six stages which include: creating a letter concept, typing, editing, affixing a letter address, folding and enclosing the letter and distributing the letter. The implementation of management has gone quite well, and currently the system is being transferred to an electronic system.

The farmer's chicken supply chain is a complex system that involves various stages starting from selecting chicken seeds, rearing, feeding, health management, to distribution of the final product to the market. Distribution Channels are closely related to the Supply Chain process, both of which are important in a business, both large and small businesses. The aim of this research is to determine the Broiler Chicken Supply Chain at Kemiri Village Broiler Farms, Jenangan District, Ponorogo Regency. The research method used is observation, interviews and documentation. This broiler farm is under contract with PT. Bintang Tama to supply feed, vitamin medicine, chicken seeds, and also chicken brokers/collectors. Chicken seeds come from PT.Bintang Tama Sentosa after which the chickens are bred for 28 days to 35 days according to the contract with the broker/collector, in 1 harvest/livestock from 3000 seedlings to harvest, the estimated death is 200 deaths, this process cannot be separated from the control carried out by the livestock manager. Chicken farming here is managed well, starting with providing different feeds. Meat chicken seeds are fed with the types of feed, namely pre starter, starter, and finisher, this feed is given at 3 different/not the same age periods for the chickens in 1 harvest. Pak Endra's Farm – Agent – Broiler Chicken Entrepreneur – Market/Restaurant – Final Consumer.