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"Penelitian ini bertujuan untuk memodifikasi karet alam yang mempunyai kekurangan dalam hal sifat ketahanan terhadap panas dan oksidasi, karena adanya kandungan ikatan rangkap C=C pada rantai polimer karet alam. Modifikasi dilakukan dengan mengeksplorasi pendekatan hidrogenasi dua fasa menggunakan karet alam padat yang dilarutkan dalam pelarut organik dan sumber hidrogen (hidrazin hidrat dan hidrogen peroksida) yang dicampur dalam air. Pilihan pelarut, katalis, dan rasio volume air terhadap pelarut diperiksa dampaknya terhadap hidrogenasi. Karakterisasi dilakukan dengan menggunakan spektroskopi Fourier Transform Inframerah (FTIR) sebagai indikator kualitatif hidrogenasi. Sementara itu, spektroskopi 1H-NMR digunakan untuk mengukur derajat hidrogenasi dari produk karet alam terhidrogenasi. Hasilnya menunjukkan bahwa hidrogenasi parsial berhasil dilakukan menggunakan toluena sebagai pelarut dan etilen diamina tetra asam asetat diammonium tembaga (Cu-EDTA) sebagai katalis, dimana variasi volume air mempengaruhi derajat hidrogenasi. Derajat hidrogenasi 7,69% dicapai dengan menggunakan 15 mL air. Pemrosesan karet alam melalui vulkanisasi dapat dilakukan dengan memanfaatkan keunggulan material karet alam terhidrogenasi dengan formula yang biasa dilakukan dengan mendapatkan sifat mekanik yang lebih baik dibandingkan menggunakan karet alam sebelum terhidrogenasi. Sementara itu, sifat termal karet alam terhidrogenasi tetap sebanding dengan bahan aslinya, dengan peningkatan ketahanan panas dan oksidasinya serta sifat mekanik. Metode hidrogenasi dua fasa ini menawarkan potensi untuk meningkatkan sifat ketahanan material karet alam untuk aplikasi pelampung tsunami buoy.

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This research aims to modify natural rubber which has deficiencies in terms of resistance to heat and oxidation, due to the presence of C=C double bonds in the natural rubber polymer chain. The modification was carried out by exploring a two-phase hydrogenation approach using solid natural rubber dissolved in an organic solvent and a hydrogen source (hydrazine hydrate and hydrogen peroxide) mixed in water. The choice of solvent, catalyst, and water-to-solvent volume ratio were examined for their impact on hydrogenation. Characterization was carried out using Fourier Transform Infrared (FTIR) spectroscopy as a qualitative indicator of hydrogenation. Meanwhile, 1H-NMR spectroscopy measures the degree of hydrogenation of hydrogenated natural rubber products. The results show that partial hydrogenation was successfully carried out using toluene as a solvent and ethylene diamine tetra copper diammonium acetic acid (Cu-EDTA) as a catalyst, with variations in water volume affecting the degree of hydrogenation. A degree of hydrogenation of 7.69% was achieved using 15 mL of water. Processing natural rubber through vulcanization can be done by utilizing the advantages of hydrogenated natural rubber material with a formula commonly used to obtain better mechanical properties than natural rubber before hydrogenation. Meanwhile, the thermal properties of hydrogenated natural rubber remain comparable to those of the original material, with improved heat, oxidation resistance, and mechanical properties. The biphasic hydrogenation method can potentially enhance natural rubber materials’ properties for tsunami buoy floater applications."

"Written in a versatile, contemporary style that will benefit both novice and expert alike, Biological and Biomedical Coatings Handbook, Two-Volume Set covers the state of the art in the development and implementation of advanced thin films and coatings in the biological field. Consisting of two volumes--Processing and Characterization and Applications--this handbook details the latest understanding of advances in the design and performance of biological and biomedical coatings, covering a vast array of material types, including bio-ceramics, polymers, glass, chitosan, and nanomaterials. Contri."

"Penelitian ini dilakukan pada gudang perusahaan radiator di Indonesia. Salah satu aktivitas utama operasional gudang yaitu aktivitas pengambilan material. Namun, aktivitas pengambilan material yang dibutuhkan untuk proses produksi ini belum efektif. Hal ini dikarenakan lamanya waktu yang dibutuhkan dalam setiap aktivitas pengambilan material. Penelitian ini bertujuan untuk membuat rancangan perbaikan aktivitas pengambilan material di gudang agar dapat meningkatkan nilai tambah dan mengurangi pemborosan pada aktivitas pengambilan material di gudang. Metode Value Stream Mapping, prinsip lean, root causes analysis, FMEA digunakan sebagai usulan perbaikan. Berdasarkan analisis yang dilakukan, terdapat usulan perbaikan yang dapat menurunkan lead time pada gudang satu sebesar 23.61%, gudang dua sebesar 31.22%, dan gudang tiga sebesar 48.65%. Penurunan lead time berpengaruh terhadap peningkatan sasaran mutu gudang. Sasaran mutu ketiga gudang mencapai target 100% yang ditetapkan perusahaan.

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This study is conducted at radiator company in Indonesia. One if the major warehouse operational activity is material issuing activity. In contrast, material issuing activity less than effective. It is because the length of time needed for each material issuing activity.

This research aims to make a design of material issuing activity improvement in warehouse to increase value added and reduce waste. Value Stream Mapping, Lean Approach, Root Cause Analysis and FMEA are used to solve problems as a proposed improvement.

Based on the analysis, there are several proposed improvements reduced the lead time of first warehouse is 23.61%, the second warehouse is 31.22%, and the third warehouse is 48.65%. Decreased of lead time effect on warehouse quality objectives improvement. All of the warehouse reach 100% target set by the company."

"This book reports on topics at the interface between manufacturing, mechanical and chemical engineering. It gives a special emphasis to CAD/CAE systems, information management systems, advanced numerical simulation methods and computational modeling techniques, and their use in product design, industrial process optimization and in the study of the properties of solids, structures and fluids. Control theory, ICT for engineering education as well as ecological design and food technologies are also among the topics discussed in the book. Based on the International Conference on Design, Simulation, Manufacturing: The Innovation Exchange (DSMIE-2018), held on June 12-15, 2018, in Sumy, Ukraine, the book provides academics and professionals with a timely overview and extensive information on trends and technologies behind current and future developments of Industry 4.0, innovative design and renewable energy generation."