Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
[Superkonduktivitas adalah fenomena yang terjadi pada beberapa material tertentu, yang mengakibatkan hilangnya hambatan listrik pada temperatur tertentu. Dengan kata lain, suatu applikasi yang menggunakan fenomena ini dapat mencapai suatu kecepatan tinggi dengan energi yang sangat rendah.Hal inilah yang menjadi daya tarik para ahli untuk mengembangkan teknologi tersebut. Pada skripsi ini, introduksi tentang sirkuit elektronik berkecepatan tinggi superkonduktif dan Rapid Single Flux quantum (RSFQ logic& family akan dibahas secara mendetail. Perangkat lunak NioPulse digunakan untuk simulasi, optimalisasi, lay+out& dan extract& sirkuit RSFQ superkonduktif sirkuit, termasuk komponen utama RSFQ, logic& gates&RSFQ,flip flops dan DC/SFQ converter. Semua proses dari simulasi dan extraction telah dijelaskan secara mendatail. ...... Superconductivity is a phenomenon occurring in some specific materials, which resulted in the loss of electrical resisteance at a certain temperature. In other words, an application that uses this phenomenon could achieve a very high speed with only using a very low energy. This is the sppeal to the experts to develop the technology. In this thesis, the introduction of hig-speed superconductive electronic circuits and Rapid Single Flux Quantum (RSFQ) logic family will be discussed in detail. NioPulse software used to design, simulation, optimization, lay-out and extract the circuit superconductive RSFQ circuits; including the main components RSFQ, RSFQ logic gates, flip flops and a CD/SFQ converte. All the complete porsess from simulation to extraction process has been described in detail.;Superconductivity is a phenomenon occurring in some specific materials, which resulted in the loss of electrical resisteance at a certain temperature. In other words, an application that uses this phenomenon could achieve a very high speed with only using a very low energy. This is the sppeal to the experts to develop the technology. In this thesis, the introduction of hig-speed superconductive electronic circuits and Rapid Single Flux Quantum (RSFQ) logic family will be discussed in detail. NioPulse software used to design, simulation, optimization, lay-out and extract the circuit superconductive RSFQ circuits; including the main components RSFQ, RSFQ logic gates, flip flops and a CD/SFQ converte. All the complete porsess from simulation to extraction process has been described in detail., Superconductivity is a phenomenon occurring in some specific materials, which resulted in the loss of electrical resisteance at a certain temperature. In other words, an application that uses this phenomenon could achieve a very high speed with only using a very low energy. This is the sppeal to the experts to develop the technology. In this thesis, the introduction of hig-speed superconductive electronic circuits and Rapid Single Flux Quantum (RSFQ) logic family will be discussed in detail. NioPulse software used to design, simulation, optimization, lay-out and extract the circuit superconductive RSFQ circuits; including the main components RSFQ, RSFQ logic gates, flip flops and a CD/SFQ converte. All the complete porsess from simulation to extraction process has been described in detail.]

Abstrak :
ABSTRACT
Peneliti melakukan proses sintesis dari material superkonduktor La2-xSrxCuO4 LSCO, dengan x = 0,16; 0,22 dan 0,25, dengan metode sol-gel. Prekursor yang peneliti gunakan dalam metode ini berbasis nitrat. Bahan dikalsinasi untuk menghilangkan komponen organik dan disintering dengan suhu 600 C selama 6 jam. Analisis pengukuran difraksi sinar-X XRD dengan Rietvield Refinement menunjukkan bahwa struktur stabil pada fase tetragonal I4/mmm dengan ukuran kristal cenderung semakin mengecil seiring dengan bertambahnya doping Sr. Scanning Electron Microscopy SEM digunakan untuk mengamati morfologi material dan mengkonfirmasi parameter sel dari analisis pengukuran XRD. Penggunaan SEM juga untuk mengkonfirmasi kehomogenan dari material LSCO. Dengan Electron Dispersive Spectroscopy hasilnya mengkonfirmasi komposisi material yang sudah mendekati nilai perhitungan. Untuk melihat adanya perubahan fasa superkonduktor, cryogenic magnetometer digunakan untuk mengukur resistivitas pada material LSCO.

---

ABSTRACT
We performed a synthesis process of the La2 xSrxCuO4 LSCO, with x 0,16 0,22 and 0,25, superconducting material by sol gel method. Precursors that we use in this method are nitrate based. The material was calcined to remove the organic component and sintered at 600 C for 6 hours. Analysis of X ray diffraction measurements XRD with Rietvield Refinement showed that the structure stabilized to the tetragonal phase I4 mmm with the crystallite size tends to decrease as doping increases Sr. Scanning Electron Microscopy SEM is used to observe the morphology of the material and confirm the cell parameters of the XRD measurement analysis. The use of SEM is also to confirm the homogeneity of LSCO material. With Electron Dispersive Spectroscopy the results confirm the composition of the material that is close to the calculation value. To see a superconducting phase change, cryogenic magnetometers are used to measure resistivity in LSCO materials.

Abstrak :
ABSTRAK
Kebutuhan material superkonduktor yang semakin tinggi mendorong manusia untuk merekayasa material ini terutama superkonduktor dalam bentuk kawat dalam aplikasi bidang kesehatan seperti Magnetic Resonance Imaging (MRI). Salah satu bahan yang berpotensi adalah MgB2 yang diharapkan dapat menggantikan material Nb3Sn karena selain mempunyai nilai temperatur kritis yang lebih tinggi, juga relatif lebih murah. Untuk mendapatkan sifat yang diinginkan, maka dalam penelitian ini dilakukan variasi jenis dopan yaitu silikon karbida (SiC) dan carbon nanotube (CNT) pada variasi komposisi persen berat sebesar 10 dan 20%. Karakteristik material meliputi sifat resistansi, temperatur kritis, morfologi struktur mikro, fasa, dan sifat superkonduktifitas. Dalam hal ini, digunakan alat difraksi sinar-X (XRD), scanning electron microscope (SEM), dan cryogenic. Hasil karakterisasi menunjukkan bahwa morfologi permukaan untuk material superkonduktor MgB2 pellet murni menunjukkan batas butir yang jelas antar partikel partikel dan setelah dijadikan sampel kawat butiran partikel menjadi lebih kecil dan terdistribusi merata. Untuk penambahan dopan SiC/CNT terbentuk gumpalan dengan adanya butiran-butiran yang teraglomerasi yang berdampak pada hasil analisis hambatan listrik. Data kuantitatif resistansi memperlihatkan bahwa superkonduktifitas pada sampel kawat menunjukkan peningkatan nilai Tczero sebesar 15 K dibanding bentuk pellet. Akan tetapi, pada sampel kawat dengan penambahan SiC memperlihatkan Tconset dan Tczero menurun secara signifikan sampai dengan 28 K, sementara penambahan CNT membuat Tconset dan Tczero menurun secara linear sampai dengan 30 K.

---

ABSTRACT
The increasing demand of superconducting material has been encouraging researchers to engineer this material especially superconducting material in the forms of wire for medical device applications such as Magnetic Resonance Imaging (MRI). One of the potential materials is MgB2, which is expected to replace Nb3Sn due to its high critical temperature in addition to its relative low cost. In order to obtain specific properties, in this study, MgB2 has been doped by using silicon carbide (SiC) and carbon nanotubes (CNT) at various composition, i.e. 10 and 20wt%. The characteristics in consideration include resistance, critical temperature, morphology of microstructure, existing phase, and superconductivity properties. The characterizations include X-ray diffraction (XRD) to reveal existing phase, scanning electron microscope (SEM), and cryogenic properties. The results showed that the surface morphology of pure MgB2 pellet samples forms clear grain boundary, whereas the wire sample showed uniform particles distributed but decrease in size with the increase of dopant concentration. Some agglomerate particles also formed with the increase of dopant concentration that affected the resistivity. The quantitative resistance data on the wire specimen showed superconductivity increase of 15 K as compared with Tczero pellet. However, the addition of SiC resulted in decrease of Tconset and Tczero to 28 K, whereas the addition of CNT resulted in decrease of Tczero and Tconset linearly up to 30 K.

Abstrak :
Superkonduktivitas merupakan fenomenologika fisika yang terjadi di suatu material yang ditandai dengan hilangnya resistivitas elektrik seiring dengan suhu lingkungan di turunkan secara ekstrim. Material yang memiliki fase superkonduktor salah satunya ditunjukkan oleh material berbasis kuprat yang mayoritas memiliki suhu kritis fase superkonduktivitas lebih tinggi dibandingkan titik leleh nitrogen cair sebagai pendingin eksternal suhu lingkungan. Material berbasis kuprat dengan suhu kritis tertinggi salah satunya terdapat pada senyawa Bi-Sr-Ca-Cu-O, spesifik pada material Bi2Sr2Ca2Cu3O10 dengan suhu kritis di suhu 110 K. Pengaruh pendopingan terhadap material kuprat berbasis senyawa Bi-Sr-Ca-Cu-O di salah satu unsur terbukti dapat mempengaruhi suhu kritis fasa superkonduktivitasnya. Dengan melakukan doping unsur Cr terhadap Cu yang bertanggung jawab atas eksisnya fasa superkonduktivitas menjadikan material Bi2Sr2Ca2(Cu1-xCrx)3O10 mengalami transisi fasa dari superkonduktor menjadi semikonduktor. Diketahui bahwa suhu transisi setelah mengalami doping Cr ditemui pada material Bi2Sr2Ca2Cu2.4Cr0.6O10 di kisaran 76.03K. Keberadaan Bi8CrO15 terlacak oleh pemetaan XRD yang diduga menjadi alasan dibalik transisi fasa dari superkonduktor menuju semikonduktor dari material Bi2Sr2Ca2(Cu1-xCrx)3O10. Kemunculan dari fasa baru Bi8CrO15 meningkat seiring dengan bertambahnya doping Cr dari material Bi2Sr2Ca2(Cu1-xCrx)3O10. ......Superconductivity is a phenomenological physics phenomenon that occurs in a material characterized by the complete absence of electrical resistivity as the environmental temperature is lowered to an extreme level. Materials exhibiting superconducting phases include copper-based compounds that typically have higher critical temperatures for superconductivity compared to the boiling point of liquid nitrogen, which serves as an external coolant at ambient temperatures. One of the copper-based compound materials with the highest critical temperature is the Bi-Sr-Ca-Cu-O compound, specifically the Bi2Sr2Ca2Cu3O10 material with a critical temperature of 110 K. The doping effect on copper-based materials such as Bi-Sr-Ca-Cu-O has been proven to influence the critical temperature of the superconducting phase. By doping the copper element with chromium (Cr), which is responsible for the existence of the superconducting phase, the material Bi2Sr2Ca2(Cu1-xCrx)3O10 undergoes a phase transition from superconductor to semiconductor. It is known that the transition temperature after chromium doping is found in the range of 76.03 K for the material Bi2Sr2Ca2Cu2.4Cr0.6O10. The existence of Bi8CrO15 is traced by XRD mapping which is suspected to be the reason behind the phase transition from superconductor to semiconductor from Bi2Sr2Ca2(Cu1-xCrx)3O10 material. The appearance of the new phase Bi8CrO15 increases with increasing Cr doping of the Bi2Sr2Ca2(Cu1-xCrx)3O10 material.