Hasil Pencarian  ::  Simpan CSV :: Kembali

Hasil Pencarian

Ditemukan 8 dokumen yang sesuai dengan query
cover
Ismoyo Suro Waskito
Pengaruh konsentrasi prekursor terhadap struktur dan koefisien friksi MoS2 nanosheet-microsphere sebagai aditif padat pada pelumas = The effect of precursor concentration on the structural properties and friction coefficient MoS2 nanosheet-microsphere as solid additive in lubricant
"MoS2 nanosheet-microsphere telah berhasil disintesis melalui metode hidrotermal dengan prekursor amonium heptamolibdat dan tiourea yang konsentrasinya campuran bervariasi 0,25 M, 0,5 M, 1,0 M dan 1,5 M. Struktur kristal, morfologi, ukuran partikel dan koefisien gesekan dan pembentukan tribofilm diamati sebagai pengaruh dari konsentrasi prekursor. Pola difraksi sinar-X menunjukkan struktur kristal heksagonal 2H-MoS2 dengan perbedaan kristalinitas medan (002) dan tidak ditemukan fase lain. Pengukuran Spektrometer Raman menunjukkan pergeseran frekuensi E1 2g dan A1g bersama dengan perubahan konsentrasi prekursor di mana MoS2 adalah dengan
konsentrasi prekursor dari frekuensi 0,25 M mendekati frekuensi massal MoS2 menunjukkan semakin banyak lapisan dan kristalinitas yang lebih baik. Pengamatan dengan Scanning Electron Microscope (SEM) yang menunjukkan morfologi partikel lembar nano dengan puluhan ketebalan nanometer berkumpul untuk membentuk microsphere dengan diameter 1-3 μm. Pengukuran koefisien gesek dan pembentukan lapisan film menunjukkan efek kristalinitas partikel pada koefisien gesekan dan pembentukan lapisan film di mana partikel dengan kristalinitas lebih rendah menghasilkan nilai koefisien gesekan yang lebih kecil dan pembentukan lapisan film lebih cepat. Menguji koefisien gesekan dengan Rig Reciprocating Frekuensi Tinggi (HFRR) juga menunjukkan penambahan 2% berat dan 3% berat MoS2-1,5M mengurangi koefisien gesekan pelumasan Yubase 8 sebesar 30% dan 37,5%
MoS2 nanosheet microsphere has been successfully synthesized through the hydrothermal method with precursors of ammonium heptamolybdate and thiourea whose concentrations the mixture is varied 0.25 M, 0.5 M, 1.0 M and 1.5 M. Crystal structure, morphology, particle size and friction coefficient and tribofilm formation were observed as influences from precursor concentration. X-ray diffraction pattern shows the crystal structure hexagonal 2H-MoS2 with a difference in field crystallinity (002) and not found another phase. Raman Spectrometer measurements show E1 frequency shifts 2g and A1g along with changes in precursor concentration where MoS2 is with the precursor concentration of 0.25 M frequency approaches the bulk MoS2 frequency indicates more and more layers and better crystallinity. Observation with Scanning Electron Microscope (SEM) showing particle morphology nanosheets with tens of nanometer thickness gathered to form microsphere with a diameter of 1-3 μm. Measurement of coefficient of friction and formation film layer shows the effect of particle crystallinity on the coefficient of friction and the formation of a film layer where particles with lower crystallinity resulting in smaller friction coefficient values ​​and film layer formation faster. Testing the coefficient of friction with the High Frequency Reciprocating Rig (HFRR) also shows the addition of 2 wt% and 3 wt% MoS2-1.5 M can decreases the coefficient of lubrication friction Yubase 8 by 30% and 37.5%."
Depok: Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Indonesia, 2019
T54300
UI - Tesis Membership  Universitas Indonesia Library
cover
Kharisma Sulistya
Pengukuran koefisien transmisi dan refleksi pada bahan dielektrik dengan frekuensi 2,4 ghz = Transmission and reflection coefficients measurement on the dielektric material at frequency 2,4 ghz
"[ ABSTRAK
Antena mikrostrip saat ini banyak diaplikasikan dalam dunia telekomunikasi. Antena mikrostrip sendiri memiliki beberapa kelebihan jika dibandingkan dengan antena jenis lain, yaitu bentuknya yang tipis dan kecil, memiliki bobot yang ringan, mudah untuk difabrikasi, serta harga yang relatif murah. Berangkat dari keperluan untuk melakukan penelitian dengan tujuan mengetahui tingkat kematangan buah-buahan dengan menggunakan antena, maka dilakukan uji coba menggunakan antena mikrostrip serta melakukan pengujian terhadap nilai koefisien transmisi dan refleksi untuk memperoleh data yang nantinya dapat digunakan untuk pengembangan alat serta teknologi lebih lanjut.
Koefisien transmisi dan refleksi ini bisa terjadi ketika propagasi gelombang elektromagnetik mengenai yang sebuah benda. Data hasil pengukuran nilai koefisien transmisi dan refleksi akan diperoleh dengan menggunakan antena mikrostrip serta Network Analyzer (NA) di dalam alat berwujud waveguide. Dengan parameter pengukuran meliputi jarak, posisi, nilai parameter S11, S21 permitivitas dan jenis bahan.
Pada skripsi ini telah dilakukan pengukuran data dengan membandingkan parameter S21 pada antena mikrostrip dengan beberapa variasi jenis benda yaitu, buah labu, buah semangka, balon garam dan balon gula. Dari hasil pengukuran diketahui bahwa nilai S21 yang paling tinggi dimiliki oleh buah labu matang nilai S21 sebesar -32,9 dB, pada buah semangka matang nilai S21 sebesar -39,7 dB, balon air garam S21 sebesar -43,52 dB, balon gula S21 sebesar -48,56 dB, labu mentah -50.09 dB dan semangka mentah -52.22 dB. Dari beberapa data pengukuran diatas, dapat diambil kesimpulan bahwa semakin rendah nilai kepadatan dan kerapatan benda uji, semakin kecil nilai koefisien transmisi dan refleksi. Dari hasil penelitian berikut ini diharapkan dapat digunakan untuk pengembangan alat pada masa yang akan datang, serta metode alternatif untuk mendeteksi tingkat kematangan buah dengan memanfaatkan antena mikrostrip serta nilai koefisien transmisi dan refleksi.
ABSTRACT Microstrip antenna is now widely applied in telecommunications. Microstrip antenna has several advantages when compared with other types of antennas, which is its thin and small, has a light weight, easy to be fabricated, and the price is relatively cheap. The aim of this research is to figuring out the level of fruit?s maturity using the antenna. Data can be obtained by using a microstrip antenna as well as some test of the Coefficient Transmission and Reflection factor. Afterward the data can be used in developing advanced technologies in the next future.
Coefficient Transmission and Reflection can occur when electromagnetic wave get on to the object, Transmission loss measurement data will be obtained by using a microstip antenna array and Network Analyzer (NA) in the Waveguide Chamber. This measurenment using some parameter such as distance, position, value?s parameter S11, S21, permitivity and type of materials.
The research has been done by comparing the data in the parameter S21 in a microstrip antenna using some materials which are a pumpkin, watermelon, balloon filled with saline and ballon containing sugar. The study shows that the highest value of S21 from a ripe pumpkin is -32,9 dB, followed by a ripe watermelon -39,7 dB, balloon filled with saline -43,52 dB, ballon containing sugar -48,56 dB, raw pumpkin -50.09 dB and a raw watermelon -52,22 dB. Furthermore, it can be concluded that the density of an object affects the value of the Coefficient Transmission and Reflection. Afterward, the data can be used in developing tools and alternative methods for detecting the level of fruit?s maturity by using a microstrip antenna and Coefficient Transmission and Reflection value.
;Microstrip antenna is now widely applied in telecommunications. Microstrip antenna has several advantages when compared with other types of antennas, which is its thin and small, has a light weight, easy to be fabricated, and the price is relatively cheap. The aim of this research is to figuring out the level of fruit?s maturity using the antenna. Data can be obtained by using a microstrip antenna as well as some test of the Coefficient Transmission and Reflection factor. Afterward the data can be used in developing advanced technologies in the next future.
Coefficient Transmission and Reflection can occur when electromagnetic wave get on to the object, Transmission loss measurement data will be obtained by using a microstip antenna array and Network Analyzer (NA) in the Waveguide Chamber. This measurenment using some parameter such as distance, position, value?s parameter S11, S21, permitivity and type of materials.
The research has been done by comparing the data in the parameter S21 in a microstrip antenna using some materials which are a pumpkin, watermelon, balloon filled with saline and ballon containing sugar. The study shows that the highest value of S21 from a ripe pumpkin is -32,9 dB, followed by a ripe watermelon -39,7 dB, balloon filled with saline -43,52 dB, ballon containing sugar -48,56 dB, raw pumpkin -50.09 dB and a raw watermelon -52,22 dB. Furthermore, it can be concluded that the density of an object affects the value of the Coefficient Transmission and Reflection. Afterward, the data can be used in developing tools and alternative methods for detecting the level of fruit?s maturity by using a microstrip antenna and Coefficient Transmission and Reflection value.
;Microstrip antenna is now widely applied in telecommunications. Microstrip antenna has several advantages when compared with other types of antennas, which is its thin and small, has a light weight, easy to be fabricated, and the price is relatively cheap. The aim of this research is to figuring out the level of fruit?s maturity using the antenna. Data can be obtained by using a microstrip antenna as well as some test of the Coefficient Transmission and Reflection factor. Afterward the data can be used in developing advanced technologies in the next future.
Coefficient Transmission and Reflection can occur when electromagnetic wave get on to the object, Transmission loss measurement data will be obtained by using a microstip antenna array and Network Analyzer (NA) in the Waveguide Chamber. This measurenment using some parameter such as distance, position, value?s parameter S11, S21, permitivity and type of materials.
The research has been done by comparing the data in the parameter S21 in a microstrip antenna using some materials which are a pumpkin, watermelon, balloon filled with saline and ballon containing sugar. The study shows that the highest value of S21 from a ripe pumpkin is -32,9 dB, followed by a ripe watermelon -39,7 dB, balloon filled with saline -43,52 dB, ballon containing sugar -48,56 dB, raw pumpkin -50.09 dB and a raw watermelon -52,22 dB. Furthermore, it can be concluded that the density of an object affects the value of the Coefficient Transmission and Reflection. Afterward, the data can be used in developing tools and alternative methods for detecting the level of fruit?s maturity by using a microstrip antenna and Coefficient Transmission and Reflection value.
;Microstrip antenna is now widely applied in telecommunications. Microstrip antenna has several advantages when compared with other types of antennas, which is its thin and small, has a light weight, easy to be fabricated, and the price is relatively cheap. The aim of this research is to figuring out the level of fruit?s maturity using the antenna. Data can be obtained by using a microstrip antenna as well as some test of the Coefficient Transmission and Reflection factor. Afterward the data can be used in developing advanced technologies in the next future.
Coefficient Transmission and Reflection can occur when electromagnetic wave get on to the object, Transmission loss measurement data will be obtained by using a microstip antenna array and Network Analyzer (NA) in the Waveguide Chamber. This measurenment using some parameter such as distance, position, value?s parameter S11, S21, permitivity and type of materials.
The research has been done by comparing the data in the parameter S21 in a microstrip antenna using some materials which are a pumpkin, watermelon, balloon filled with saline and ballon containing sugar. The study shows that the highest value of S21 from a ripe pumpkin is -32,9 dB, followed by a ripe watermelon -39,7 dB, balloon filled with saline -43,52 dB, ballon containing sugar -48,56 dB, raw pumpkin -50.09 dB and a raw watermelon -52,22 dB. Furthermore, it can be concluded that the density of an object affects the value of the Coefficient Transmission and Reflection. Afterward, the data can be used in developing tools and alternative methods for detecting the level of fruit?s maturity by using a microstrip antenna and Coefficient Transmission and Reflection value.
, Microstrip antenna is now widely applied in telecommunications. Microstrip antenna has several advantages when compared with other types of antennas, which is its thin and small, has a light weight, easy to be fabricated, and the price is relatively cheap. The aim of this research is to figuring out the level of fruit’s maturity using the antenna. Data can be obtained by using a microstrip antenna as well as some test of the Coefficient Transmission and Reflection factor. Afterward the data can be used in developing advanced technologies in the next future.
Coefficient Transmission and Reflection can occur when electromagnetic wave get on to the object, Transmission loss measurement data will be obtained by using a microstip antenna array and Network Analyzer (NA) in the Waveguide Chamber. This measurenment using some parameter such as distance, position, value’s parameter S11, S21, permitivity and type of materials.
The research has been done by comparing the data in the parameter S21 in a microstrip antenna using some materials which are a pumpkin, watermelon, balloon filled with saline and ballon containing sugar. The study shows that the highest value of S21 from a ripe pumpkin is -32,9 dB, followed by a ripe watermelon -39,7 dB, balloon filled with saline -43,52 dB, ballon containing sugar -48,56 dB, raw pumpkin -50.09 dB and a raw watermelon -52,22 dB. Furthermore, it can be concluded that the density of an object affects the value of the Coefficient Transmission and Reflection. Afterward, the data can be used in developing tools and alternative methods for detecting the level of fruit’s maturity by using a microstrip antenna and Coefficient Transmission and Reflection value.
]"
Depok: Fakultas Teknik Universitas Indonesia, 2016
S62095
UI - Skripsi Membership  Universitas Indonesia Library
cover
Electron microscopy in biology; Vol. 2
New York: John Wiley & Sons, 1982
578 ELE
Buku Teks  Universitas Indonesia Library
cover
Electron microscopy in biology : a practical approach
Oxford: IRL Press, Oxford:
578.45 ELE e
Buku Teks  Universitas Indonesia Library
cover
Neysa Sheliza Putri Dharma
Konsistensi Penerjemahan Unsur Makro dan Mikro melalui Skema W-Frage pada “Digitalisasi, Solusi Pemulihan Ekonomi?” dalam Majalah NADI = Consistency of Macro and Micro Translation through W-Frage Scheme in "Digitalisation, a Solution for Economic Recovery?" in NADI Magazine
"Penelitian ini bertujuan untuk menganalisis konsistensi penerjemahan dalam majalah NADI vol. 28 tahun 2021 pada artikel berjudul "Digitalisasi, Solusi Pemulihan Ekonomi?" dengan menggunakan unsur makro dan mikro melalui skema W-Frage oleh Christiane Nord. Penelitian bertujuan untuk memberikan pemahaman yang lebih baik tentang konsistensi penerjemahan dalam konteks media komunikasi. Berdasarkan hasil penelitian, terdapat 7 alasan yang menyebabkan ketidakkonsistenan antara TSu (teks sumber) dan TSa (teks sasaran). Setelah diteliti secara keseluruhan, ketidakkonsistenan pada teks terjadi karena penerjemah memperhatikan konvensi budaya sasaran dan menggunakan metode komunikatif guna memperjelas maksud dari kalimat.
This study aims to analyze the consistency of translation in NADI magazine vol. 28 of 2021 in the article titled "Digitalisation, Solution for Economic Recovery?" by using macro and micro elements through Christiane Nord's W-Frage scheme. The research aims to provide a better understanding of translation consistency in the context of communication media. Based on the research results, there are 7 reasons that cause inconsistency between TSu (source text) and TSa (target text). After an overall study, the inconsistency in the text occurs because the translator pays attention to the conventions of the target culture and uses communicative methods to clarify the meaning of the sentence."
Depok: Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2023
MK-pdf
UI - Makalah dan Kertas Kerja  Universitas Indonesia Library
cover
Tutik Setianingsih, 1969-
Mikroskop elektron transmisi: teori dan aplikasinya untuk karakteristik material
Malang: UB Press, 2017
620.1 TUT m
Buku Teks  Universitas Indonesia Library
cover
Berlyn, Graeme P.
Botanical microtechnique and cytochemistry
Iowa: Iowa State University Press, 1976
581.028 BER b
Buku Teks  Universitas Indonesia Library
cover
Fanny Anggraeni Octoviani
Nilai Diagnostik Metode Coproantigen Dan Mikroskopik Untuk Deteksi Giardia intestinalis Pada Anak Stunting = Diagnostic value of Coproantigen and Microscopics Methods for Detecting Giardia intestinalis in Stunting Children
"Giardiasis adalah infeksi parasit yang disebabkan oleh Giardia intestinalis, yang pada umumnya dialami oleh anak-anak. Giardia intestinalis merupakan penyebab infeksi terbanyak di negara berkembang, termasuk Indonesia yang berdampak pada tumbuh kembang anak dan fungsi kognitifnya serta dapat menjadi sumber infeksi (carrier) bagi lingkungannya. Pemeriksaan yang dipakai pada penelitian ini dengan mikroskopik langsung dan pemeriksaan coproantigen, untuk mendiagnosis Giardiasis. Adapun tujuan dari penelitian ini adalah mengevaluasi pemeriksaan coproantigen pada anak-anak dengan stunting dengan dan tanpa gejala dibandingkan dengan pemeriksaan mikroskopik. Penelitian ini bersifat uji diagnosis pada coproantigen dengan mikroskopik sebagai standar baku pemeriksaan Giardiasis dengan desain potong lintang. Penelitian ini menggunakan sampel koleksi pada populasi anak stunting di Bandung yang dikumpulkan pada bulan Januari-Maret 2020 kemudian dilakukan pemeriksaan di Departemen Parasitologi FKUI. Pada pemeriksaan mikroskopik langsung pada 99 sampel anak dengan stunting didapatkan hasil positif Giardia intestinalis 9,1% (9 sampel), Blastocyst hominis 3% (3 sampel), Entamoeba coli 1% (1 sampel) sedangkan pemeriksaan coproantigen didapatkan 6 sampel positif (6,1%), dan negatif ada 93 sampel (93,9%). Nilai sensitivitas coproantigen 55,5%, sedangkan spesifisitasnya 98,8%, PPV 83,33%, NPV 95,7%. Kesimpulannya pada alat tersebut memiliki spesifisitas tinggi, namun sensitivitas masih rendah sehingga diperlukan alat diagnostik yang lain, namun bisa dipakai sebagai alat skrining pada anak-anak sehingga dapat mencegah kejadian kurang gizi (stunting), karena paling cepat dan bisa dalam jumlah sampel yang besar. Penggunaan alat ini masih perlu dilakukan penelitian lanjutan. Untuk saat ini alat diagnostik yang tepat sebagai standar baku menggunakan pemeriksaan mikroskopik karena lebih murah dan dapat mendeteksi tidak hanya satu parasit saja, namun bisa pada beberapa parasit, namun membutuhkan keahlian dari individu.
Giardiasis is a parasitic infection caused by Giardia intestinalis, which is commonly experienced by children. Giardia intestinalis is the most common cause of infection in developing countries, including Indonesia, which has an impact on children's growth and development and cognitive function and can be a source of infection (carrier) for the environment. The examination used in this study was direct microscopy and coproantigen examination, to diagnose Giardiasis. The purpose of this study was to evaluate coproantigen examination in stunted children with and without symptoms compared with microscopic examination. This study is a diagnostic test on coproantigen with a microscope as the standard for Giardiasis examination with a cross-sectional design. This study uses a sample collection of the stunting child population in Bandung which was collected in January-March 2020 and then examined at the Department of Parasitology FKUI. On direct microscopic examination of 99 samples of children with stunting, the positive results were Giardia intestinalis 9.1% (9 samples), Blastocyst hominis 3% (3 samples), Entamoeba coli 1% (1 sample) while the coproantigen examination found 6 positive samples 6 samples. (6,1%), and negative there were 93 samples (93.9%). The sensitivity value of coproantigen was 55.5%, while the specificity was 98.8%, PPV 83.33%, NPV 95.7%. The conclusion is that this tool has high specificity, but its sensitivity is still low, so another diagnostic tool is needed, but it can be used as a screening tool in children so that it can prevent stunting, because it is the fastest and can be in a large number of samples. The use of this tool still needs further research. For now, the right diagnostic tool as a standard is using microscopic examination because it is cheaper and can detect not only one parasite, but can be in several parasites, but requires expertise from the individual."
Jakarta: Fakultas Kedokteran Universitas Indonesia, 2022
SP-pdf
UI - Tugas Akhir  Universitas Indonesia Library