Dini Cahyandari
Fakultas Teknik, Universitas Muhammadiyah Semarang Jl. Kasipah No. 12 Semarang

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PEMANFAATAN LIMBAH KAYU SEBAGAI BAHAN DASAR PEMBUATAN PAPAN PARTIKEL Cahyandari, Dini
T R A K SI Vol 5, No 1 (2007): mechanical engineering
Publisher : T R A K SI

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Perusahaan penggergajian banyak menghasilkan limbah yang berupa serbuk kayu. Selama ini belum ada kegiatan yang dilakukan untuk memanfaatkan limbah tersebut. Salah satu cara yang dapat dilakukan untuk memanfaatkan limbah tersebut adalah dengan mengolahnya menjadi papan partikel. Papan partikel adalah komposit kayu dan adhesive yang dapat berupa bahan anorganik seperti phenol formaldehyde dan bahan organik seperti polyisocyanates.  Dari hasil penelitian didapatkan hasil bahwa penggunaan serbuk kayu keras dan adhesive dari bahan phenol formaldehyde mempunyai sifat mekanik yang paling baik baik yaitu mempunyai kekuatan tarik 0.46 N/mm2 dan kekuatan tekuk : 17.26 N/mm2 dibandingkan penggunaan bahan lainnya.   Kata Kunci : Limbah, Papan Partikel
Pengembangan Proses Enzimatis Untuk Produksi Biodisel Dari Minyak Jarak Pagar dan Uji Performa Pada Mesin Disel Cahyandari, Dini
T R A K SI Vol 7, No 2 (2008): mechanical engineering
Publisher : T R A K SI

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oil reserved that belonged to Indonesia is limited. In order that there were some efforts have performed to seek an alternative gr.rn una renewable fuel such as biodiesel. Biodiesel production from Jatropha curcas is basically methanolysis reaction, the reaction of triglyceride with metLanol yield to methyl ester and glycerol. This transesterification is performed enzimatically because it has some advantages: energy save, complete transesterification for high free fatty acid and water easy drawn for glycerol, and no washing.The objectives of this research is ti develop enzymatic process to produce biodiesel from Jatropha curcas by using indigeneous enzyme from papain lateks and husk. The achievements are date for design scale-upand process condition including kinetics reaction, optimum process and data of engine performance. In first year, designing and fabricating. of enxymatic reactor was done followed by studied of kinetics reaction and process computing. Model building was performed based on Michaelis-Menten theory. Model was postulated and then broken down to empirical equation that will be examined and validated by experimental data gathered. The result in the first year showed that longer in time more biodiesel got in conversion at alter ratio. Lipase activity increased in increasing temperature. The optimum temperature was 51  °C. Adding n-hexane solvent has been able to increase conversion in transesterification reaction and to increase enzymatic reaction rate.
PERHITUNGAN PERBANDINGAN KONSUMSI BAHAN BAKAR-UDARA MESIN TOYOTA CORONA 2000 CC Yulianto, Arief Rudy; Sigit A, Drs. Ireng; Cahyandari, Dini
T R A K SI Vol 12, No 2 (2012): MAJALAH ILMIAH TEKNIK MESIN
Publisher : T R A K SI

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Sebuah mobil merupakan suatu kendaraan dimana penggeraknyamenggunakan motor (engine) dengan menggunakan bahan bakar berupabensin atau solar. Mulai tahun 1885 sampai dengan tahun 2007 banyak mobil dirancang dengan menggunakan bahan bakar yang berasal dari minyak bumi tersebut. Akan tetapi ada juga sebagian kecil yang telah menggunakan penggerak motor listrik dan tenaga angin. Meskipun demikian, penggunaan bahan bakar bensin maupun solar masih mendominasi konsumsi mesin-mesin kendaraan saat ini. Permasalahan yang terjadi mengenai penggunaan bahan bakar yang berasal dari minyak bumi, seperti bensin adalah semakin menipisnya cadangan sumber bahan bakar tersebut. Hal ini disebabkan sumber energi tersebut adalah sumber energi yang tidak dapat diperbaharui sehingga lama-kelamaan akan mengalami kelangkaan. Oleh karena itu perlu sekali melakukan penghematan energi dari minyak bumi tersebut. Untuk mengetahui besarnya konsumsi bahan bakar pada sebuah kendaraan dapat dilakukan pengujian dan perhitungan ulang dengan melihat kondisi yang sebenarnya. Dari hasil perhitungan pada Mesin Toyota Corona 2000 CC diperoleh bahwa konsumsi bahan bakar adalah 1 dan 12 untuk udara.Kata Kunci: Konsumsi Bahan Bakar, Mesin Toyota Corona 200 CC
PENGARUH PENAMBAHAN SERAT BACTERIAL CELLULOSE TERHADAP KEKUATAN TARIK DAN TRANSPARANSI BAHAN KOMPOSIT AKRILIKBACTERIAL CELLULOSE Cahyandari, Dini; Solichan, Ahmad
Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Vol 1, No 1 (2014): PROSIDING SEMINAR NASIONAL SAINS DAN TEKNOLOGI 5 2014
Publisher : Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik

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Bagi industri optoelektronik, material resin transparan yang mempunyai sifat mekanik yang lebih baik sangatlah penting seiring dengan berkembangnya peralatan display atau layar monitor.  Resin epoxy yang diperkuat dengan partikel atau serat gelas ukuran mikro telah berhasil meningkatkan kekuatan dan ekspansi panas rendah dengan penurunan ekspansi yang sangat kecil. Dengan penambahan serat bacterial cellulose sebagai penguat diharapkan kekuatan mekanik akrilik akan meningkat namun tidak menurunkan transparansi dari akrilik. Bacerial cellulose adalah serat selulose yang dihasilkan oleh bacteria Acetobacter xylinum. Serat Bacterial cellulose ini berbentuk jaring-jaring yang mempunyai ukuran nano. Sehingga serat Bacterial cellulose ini dapat dijadikan kandidat sebagai penguat bahan polimer seperti akrilik. Pada penelitian ini akan dicari perubahan sifat mekanik dan transparansi material akrilik dan komposit akrilik-bacterial cellulose. dari hasil penelitian diperoleh hasil bahwa kekuatan tarik komposit akrilik-bacterial cellulose meningkat menjadi 20 MPa dibandingkan kekuatan tarik akrilik yang hanya 5 MPa. Sedangkan regular transmitance akrilik yang sebesar 90% menurun menjadi 81% pada material komposit akrilik-bacterial cellulose.  yang berarti penurunan transmitansi cahaya komposit akrilik-bacterial cellulose sebesar 0,7%. Hal ini sangat kecil jika dibandingkan dengan peningkatan kekuatan tarik komposit akrilik-bacterial cellulose yang mencapai 5 kali lipat kekuatan tarik akrilik. Dari hasil penelitian ini dapat disimpulkan bahwa material akrilik-bacterial cellulose mempunyai potensi untuk digunakan sebagai bahan display. Kata Kunci :  komposit, akrilik, bacterial cellulose, kekuatan tarik, transparansi
STUDI AWAL POTENSI KOMPOSIT SELULOSE BAKTERIA-POLIANILIN SEBAGAI SUBSTRAT SEL SURYA Cahyandari, Dini; Solichan, Ahmad; Prasetyo, Toni
PROSIDING SEMINAR NASIONAL 2014: PROSIDING SEMINAR NASIONAL HASIL - HASIL PENELITIAN & PENGABDIAN
Publisher : Universitas Muhammadiyah Semarang

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In recent decades, alternative energy from solar cell was investigating by many researcher because it can use as energy substitutes petrol and reduces green house effects. Nowdays, reduces petrol subsidized effect on increased prices of petrol. That is the reason why study on solar cell is important. Dye sensitized solar cell is one of simple technology to use solar energy became electricity. Polyanilin is one of polimer that is electricity conductor. Bacteria cellulose can use as template of polyanilin to polymerisation. SEM and FT-IR investigation shows that composites of bacterial cellulose-polyanilin polimerisation well on bacterial cellulose fiber that sintesized from nata de cassava.
Effect of Fiber Volume Fraction Of Tensile Strength and Impact Strength biocomposite of Bacterial cellulose-Shellac Cahyandari, Dini
PROSIDING SEMINAR NASIONAL & INTERNASIONAL 2016: Proceeding of International Seminar on Education Technology (ISET) 2016
Publisher : Universitas Muhammadiyah Semarang

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Abstract. Composites materials usually consist of reinforcement or filler by glass or carbon fiber and the polymer matrixmade of petroleum. These materials are not appropriate because it cant be degradated by environment and need alot ofenergy to produce them. Their waste only can be burned to produce CO2 and CO that caused global warming. Thereforresearch on biocomposites, that more environmental friendly are needed. The objective of this study is to investigated theeffect of volume fraction of fiber on tensile and impact strength of bacterial cellulose fiber reinforced shellac biocomposites. This research is focus on biocomposites of bacterial cellulose and shellac. Bacterial cellulose is cellulose that produced from bacteria Acetobacter Xylinum. Medium that used in this research is tapioka water. Shellac is secretion of lac bug.Bacterial cellulose reinforced shellac biocomposites obtained by blending nata de cassava gel and shellac until become slurry. Volume fraction of bacterial cellulose are 0%, 30%, 50% and 60%. The result showed that the optimal tensile strength of biocomposites is the 60%. highest impact strength is obtained on 50% of bacterialcellulose.
STUDI AWAL POTENSI KOMPOSIT SELULOSE BAKTERIA-POLIANILIN SEBAGAI SUBSTRAT SEL SURYA Cahyandari, Dini; Solichan, Ahmad; Prasetyo, Toni
PROSIDING SEMINAR NASIONAL & INTERNASIONAL 2014: PROSIDING SEMINAR NASIONAL HASIL - HASIL PENELITIAN & PENGABDIAN
Publisher : Universitas Muhammadiyah Semarang

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Abstract

In recent decades, alternative energy from solar cell was investigating by many researcher because it can use as energy substitutes petrol and reduces green house effects. Nowdays, reduces petrol subsidized effect on increased prices of petrol. That is the reason why study on solar cell is important. Dye sensitized solar cell is one of simple technology to use solar energy became electricity. Polyanilin is one of polimer that is electricity conductor. Bacteria cellulose can use as template of polyanilin to polymerisation. SEM and FT-IR investigation shows that composites of bacterial cellulose-polyanilin polimerisation well on bacterial cellulose fiber that sintesized from nata de cassava.
Peningkatan Kapasitas Produksi Rumah Potong Unggas Tradisional dengan Menggunakan Alat Bubut Bulu Di Kecamatan Sapuran Kabupaten Wonosobo Cahyandari, Dini; Prasetyo, M Toni
Berdikari: Jurnal Pengabdian Masyarakat Indonesia Vol 1 No 3 (2019): Berdikari: jurnal Pengabdian Masyarakat Indonesia
Publisher : Galaxy Science

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Usaha Pemotongan Ayam Ibu Siti telah merintis usaha ini sejak awal tahun 1990 an dan masih bertahan sampai sekarang. Dalam usahanya Ibu Siti membeli ayam pedaging dari peternak ayam yang ada di sekitar lingkungan. Kemudian diolah untuk selamnjutnya dijual ke pasar tradisional di Kecamatan Sapuran. Sedangkan usaha pemotongan ayam Ibu Mundri dimulai sekitar awal tahun 2000 an. Setiap harinya sekitar 100 ekor ayam di olah untuk selanjutnya dipasarkan. Yang menjadi salah satu masalah bagi Usaha Pemotongan Ayam termasuk Industri Mitra IbM Usaha pemotongan Ayam Ibu Siti adalah sanitasi proses pemotongan ayam sampai dengan proses pemasaran. Tempat pemotongan ayam kurang higienis, sehingga pada kegiatan pengabdian IbM ini pelaksana akan mengenalkan proses pengolahan ayam potong yang lebih higienis. kegiatanMasalah lain adalah penggunaan tenaga manusia pada proses pembubutan bulu ayam yang berakibat pada tingginya biaya produksi dan besarnya tingkat ketergantungan pada tenaga kerja manusia. Masalah lainnya adalah pengolahan daging ayam menjadi produk olahan yang lebih mempunyai nilai ekonomi tinggi dan lebih awet.
PRODUKSI BIO DIESEL DARI MINYAK JARAK PAGAR MELALUI PROSES ENSIMATIS Cahyandari, Dini; Y, Muhammad E ndy
Jurnal Litbang Provinsi Jawa Tengah Vol 5, No 2 (2007): Jurnal Litbang Provinsi Jawa Tengah
Publisher : Badan Penelitian dan Pengembangan Provinsi Jawa Tengah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36762/litbangjateng.v5i2.150

Abstract

Biodiesel ( methyl ester or Ethyl Ester) is the solution to the expensiveof fuel. Biodisel is produced from vegetable oil that the cost can be presser to the rational price. There are some material that can produce biodisel, like coconut oil, sun flower seed oil, soys oil, Jatrophacurcas oil and so on. Researcherchoose Jatropha curcas oil as basic material ofbiodisel because Jatropha curcas oil that produce from Jatropha curcas seed can grow easily on Indonesialand. On the other hand Jatropha ?curcas oil ?cannot use as consume oil so there are much oil for fuel than consume oil. The other reason is Jatropha curcas seed has much oil than other seed with enzyme from papaya lateksand bekatul that easyto find and lower cost. Researchmethods are project pilot of enzymatic reactor, study of'biodiesel productivity and optimize the process parameter.The hypothesis is the productionofbiodisel ?with chemical process have some problems. There are energy consuming, transesterification that not perfectand the difficulty to take glycerol product. These problem can be solved by using enzimatis method. Some vegetableoil have been use as biodiesel include jatropa curcas oil. From other researchcan be conclude that dependent factor to produce biodieselwith enzimatis method are kind of enzyme, water,methanol/oil ratio and themperaturfor sort time reaction.
INJECTION MOULDING OF PLA (POLYLACTIC ACID) REINFORCED BACTERIAL CELLULOSE FIBER FROM NATA DE COCO BIOCOMPOSITES Cahyandari, Dini
PROSIDING SEMINAR NASIONAL & INTERNASIONAL 2017: Proceeding 3rd ISET 2017 | International Seminar on Educational Technology 3rd 2017
Publisher : Universitas Muhammadiyah Semarang

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For many applications, natural fibers provide reinforcement properties at lower cost, lower density, and higher strength and stiffness. The potential advantages of natural fiber have been well documented and are generallybased on environmental friendliness as well as health and safety factors. Most researches concentrate on naturalfibre/nondegradable polymer composites but research reports on natural/biodegradable polymer composites arerather limited. The performance of natural fiber including recycled newspaper fiber, bamboo and hemp fiber,nata de cassava etc, reinforced PLA composites has been investigated.  Determined the mechanical propertiesof the PLA/jute fiber composites and showed that the tensile strength of composites was significantly higherthan that of PLA. But the elongation at break of the composites is still very low as about 2%. Cellulose is abiopolymer whose availability on earth is abundant, known as a major component in plants. But cellulose is alsoan extracellular microbial polymer. Cellulose bacteria is a specific product of primary metabolism. Cellulose issynthesized by bacteria derived from Acetobacter, Rhizobium, Agrobacterium, and Acetobacter generationSarcina. Effectively effective gram is acetobacter xylinum acetic acid bacteria. Cellulose bacteria has beenapplied as nata de coco, wound care products, and tissue engineering. In addition, bacterial cellulose also has thepotential to strengthen the polymer to form a nanocomposite Keywords: Bacterial, Nata De Coco