Cooling systems in tropical countries consume a large portion of the overall energy usage in a building, especially in tropical climates, where there is an especially high demand on cooling systems throughout the year. This paper presents a simulation of the effect of zeolite adsorbent granular size on a zeolite-water solar adsorption chiller for Universitas Indonesia. The adsorption chiller is being mathematically modeled and calculated numerically, using MATLAB®. The mathematical modeling is based on heat transfer principles inside the system for the water inlet and outlet of the system. The adsorption chiller is based on the most recent chiller developed by Shanghai Jiao Tong University (SJTU). The simulation results generally demonstrated the running characteristics of the chiller under a range of different values of granular size. The average granular sizes used in the simulation ranged from 0.5 mm to 1.5 mm. Furthermore, the simulation results showed in detail that the smaller the average granular size of zeolites, the faster the time needed to reach the maximum hot water temperature and the balance state of chilled water outlet temperature.

Bawang merah (Allium Cepa) dan sayur kubis (Brassica Oleracea) merupakan komoditi holtikultural yang dikembangkan dan memiliki prospek yang bagus yang tergolong sayuran rempah. Timbal adalah logam lunak kebiruan atau kelabu keperakan yang lazim terdapat dalam kandungan endapan sulfit yang tercampur mineral-mineral lain terutama seng dan tembaga.Penelitian ini bertujuan untuk mengetahui kandungan Timbal (Pb) pada bawang merah (Allium Cepa) dan sayur kubis (Brassica Oleracea). Jenis penelitian ini adalah studi literatur, yaitu dengan mengumpulkan data berupa data sekunder yang diperoleh dari literatur-literatur dan hasil penelitian sebelumnya yang mengkaji hubungan variabel bebas dan variabel terikat. Sampel dalam penelitian dengan studi kepustakaan ini adalah 6 jurnal yang sekaitan dengan judul.Hasil dari penelitian menunujukkan bahwa terdapat 3 jurnal tentang kandungan Timbal (Pb) pada bawang merah (Allium Cepa) dengan hasil rata – rata pada jurnal 1 sebesar 0,0187 ppm, jurnal 2 sebesar ≤ 0,01 ppm, jurnal 3 sebesar ≤ 0,1046 ppm dan 3 jurnal tentang kandungan logam berat timbal (Pb) pada sayur kubis (Brassica Oleracea) dengan hasil rata – rata pada jurnal 1 sebesar 5,49 ppm, jurnal 2 sebesar ≤ 0,09 ppm dan pada  jurnal 3 sebesar 0,0963 ppm, yang dipengaruhi oleh penggunaan argokimia, asap kendaraan, usia lahan pertanian yang digunakan. Berdasarkan hasil dapat disimpulkan bahwa petani bawang merah (Allium Cepa) dan sayur kubis (Brassica Oleracea) sebaiknya menggunakan pestisida nabati atau senyawa bioaktif alamiah yang berasal dari tumbuhan serta mengurangi dosis pemakaian pestisida dan pupuk. Kata Kunci : Bawang Merah (Allium Cepa), Sayur Kubis (Brassica Oleracea), Timbal (Pb)

Root canal treatment consists of access preparation, root canal preparation,intracanal disinfection and root canal lling. Root canal disinfection is accomplished by irrigation and root canal medicament. In post-endodontic treatment infections, the dominant bacteria is Enterococcus faecalis. Intracanal medicaments that are derived from the Aloe vera plant have been widely studied for their antimicrobial potential against the pathogenic bacteria Enterococcus faecalis. Aloe vera gel medicament has antimicrobial effects that can inhibit the growth of Enterococcus faecalis bacteria. The aim of this study was to conduct an integrative technique st Objective: udy with scientic evidence relating to the antimicrobial potential of Aloe vera as an alternative root canal medicament against Enterococcus faecalis bacteria. Analyzing journals from the Methods: database of Google Scholar and Medline (PubMed). This review revealed that Al Conclusion: oe vera has antimicrobial action against the Enterococcus faecalis bacteria, but the use of Aloe vera as a root canal medicament is still controversial due to many differences in some researchers.