A hepta-band bandpass filter (HB-BPF) based on folded cross-loaded stepped impedance resonator (SIR) was investigated. A cross-loaded SIR microstrip structure was arranged to produce several transmission zeros. In order to reduce the filter size, a folded cross-loaded SIR was proposed. The HB-BPF was designed on FR4 microstrip substrate with ε r = 4.4, thickness h = 0.8 mm, and tan δ = 0.0265. This HB-BPF achieves transmission coefficients of 0.
IPv6 is the successor of IPv4, the current Internet Protocol that runs out its address. It offers some improvements including simpler header format and extension header resulting in faster transmission of IP packets. However, IPv6 is a network layer protocol that requires lower layer services. IP packets from the network layer pass to data link layer to be encapsulated by layer 2 headers and trailer to become frames. Ethernet is the most widely used data link layer protocol in the current network devices. The technology is always improved to support high speed transmission. However, from standard Ethernet until ten gigabit Ethernet, the size of MTU remains unchanged at 1500 Bytes. This prevents the network from gaining an optimum performance on transmitting IP packets and operating systems cannot take full advantage of the high-speed performance of Gigabit Ethernet. This research aims to implement the transmission of IPv6 packets using jumbo frame on a test-bed environment. The implementation can be used to justify the impact of jumbo frame on the network as well as operating systems performance. The results prove that the OS used on implementation of jumbo frame affects on the network performance. The highest percentage of increasing throughput is 33.6% when both sender and receiver are running Windows. The decreasing delay by 54.36% was happened when using Linux in sender and Windows in receiver.
D2E adalah mesin uji tarik yang digunakan di Laboratorium Teknik Metalurgi UNTIRTA. Mesin tersebut digunakan baik untuk praktikum Material Teknik maupun pengujian spesimen yang diminta oleh beberapa industri. Mesin tersebut dapat melakukan pengujian tarik dengan baik, namun untuk analisanya dilakukan secara manual, sehingga membutuhkan waktu yang banyak dan keakuratan hasil analisanya tidak terlalu akurat. Oleh karena itu, dibutuhkan sebuah perangkat lunak yang dapat menganalisa hasil uji tarik dalam bentuk grafik secara real time. Perangkat lunak visualisasi dibuat menggunakan Visual Basic 6.0 dan data hasil mesin uji tarik disimpan menggunakan basis data Microsoft Access. Perangkat lunak tersebut dibuat untuk merekam setiap karakter yang tampil di LCD pada control panel mesin uji tarik lalu kemudian mengolahnya untuk dijadikan grafik. Berdasarkan hasil implementasi spesimen plat dan kawat membuktikan bahwa perbedaan nilai pengamatan antara penggunaan perangkat lunak visualisasi lebih akurat dan efektif dalam waktu penggunaannya, jika dibandingkan dengan pengamatan manual yang membutuhkan analisa lebih lanjut dari hasil pengujian. Dalam perangkat lunak visualisasi hasil uji tarik, sifat-sifat mekanis dapat dianalisa secara langsung dari hasil pengujian data serta grafik yang diperoleh secara real time.
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