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Iskandar Zulkarnain - One of the best experts on this subject based on the ideXlab platform.
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sumatera is not a Homogeneous Segment of gondwana derived continental blocks a new sight based on geochemical signatures of pasaman volcanic in west sumatera
Jurnal RISET Geologi dan Pertambangan, 2016Co-Authors: Iskandar ZulkarnainAbstract:Many authors have written and drawn that Sumatra is a Homogeneous continental Segment because it was constructed by continental blocks derived from Gondwana in different time and periods since initiation of Sundaland in the Triassic. There is an idea to suggest that Sumatra is fully recognized as a continental margin of Sundaland, while another idea draws that Sumatra consists of Sibumasu, West Sumatra Block and continental crust accreted onto Sundaland. However, both ideas have shown that Sumatra is composed of continental blocks. Geochemical signatures of Pasaman volcanic, collected from West Sumatra, using Ta/Yb versus Th/Yb discriminant diagram indicate that the rocks are derived from two different tectonic settings, not only from active continental margin (ACM) but also from oceanic arc tectonic environments. The discrimination becomes more clear and explicit in Yb (ppm) versus Th/Ta diagram where the ACM-derived rocks have Th/Ta ratio between 6-20 while the arc-derived samples show the ratio greater than 20. Identification of the tectonic setting origin of the volcanic can also be done using spider diagrams of selected trace elements, but it is not possible based on spider diagrams of REE. The geochemical signatures of Pasaman volcanic give evidence that Sumatra actually is not a homogenous Segment of Gondwana-derived continental blocks, but consists of two different Segments including ACM and arc tectonic settings. These evidences strengthen previous studies results in Lampung, Bengkulu and Central Sumatra. Banyak penulis yang telah menulis dan menggambarkan bahwa Sumatera adalah sebuah segmen benua yang homogen, karena ia disusun oleh sejumlah blok bersifat benua yang berasal dari Gondwana dalam waktu dan periode yang berbeda-beda sejak pembentukan Sundaland pada Zaman Trias. Terdapat pemikiran yang menganggap bahwa Sumatera sepenuhnya dikenali sebagai tepian benua dari Sundaland, sementara itu pendapat lain menggambarkan bahwa Sumatera terdiri dari Sibumasu, Blok Sumatera Barat dan kerak benua yang didorong naik ke atas Sundaland. Namun demikian, kedua pendapat tersebut menunjukkan bahwa Sumatera dibentuk oleh blok-blok benua. Ciri geokimia batuan volkanik daerah Pasaman , yang dikumpulkan dari Sumatera Barat, dengan menggunakan diagram pembeda Ta/Yb terhadap Th/Yb menunjukkan, bahwa batuan-batuan tersebut berasal dari dua lingkungan tektonik yang berbeda, tidak hanya dari tepian benua aktif (ACM), tetapi juga dari lingkungan tektonik busur lautan. Pembedaan itu menjadi lebih jelas dan eksplisit di dalam diagram Yb (ppm) terhadap Th/Ta, dimana batuan-batuan yang berasal dari ACM memiliki rasio Th/Ta antara 6 dan 20, sementara itu conto batuan yang berasal dari lingkungan busur menunjukkan rasio yang lebih besar dari 20. Identifikasi lingkungan tektonik asal dari batuan volkanik dapat juga dilakukan dengan menggunakan diagram laba-laba dari unsur-unsur jejak terpilih, akan tetapi tidak mungkin dilakukan berdasarkan diagram laba-laba dari unsur REE. Ciri geokimia batuan volkanik daerah Pasaman tersebut memberikan bukti-bukti bahwa Sumatera sesungguhnya bukanlah sebuah segmen homogen yang berasal dari blok-blok benua Gondwana, akan tetapi terdiri dari dua segmen berbeda yang mencakup lingkungan ACM dan busur. Bukti-bukti ini memperkuat hasil penelitian sebelumnya di Lampung, Bengkulu dan SumateraTengah
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sumatra is not a Homogeneous Segment of gondwana derived continental blocks a new sight based on geochemical signatures of pasaman volcanic in west sumatra sumatera sebagai sebuah segmen blok benua tidak homogen berasal dari gondwana sebuah pandangan baru berdasarkan ciri geokimia batuan volkanik daerah pasaman sumatera barat
2016Co-Authors: Iskandar ZulkarnainAbstract:Many authors have written and drawn that Sumatra is a Homogeneous continental Segment because it was constructed by continental blocks derived from Gondwana in different time and periods since initiation of Sundaland in the Triassic. There is an idea to suggest that Sumatra is fully recognized as a continental margin of Sundaland, while another idea draws that Sumatra consists of Sibumasu, West Sumatra Block and continental crust accreted onto Sundaland. However, both ideas have shown that Sumatra is composed of continental blocks. Geochemical signatures of Pasaman volcanic, collected from West Sumatra, using Ta/Yb versus Th/Yb discriminant diagram indicate that the rocks are derived from two different tectonic settings, not only from active continental margin (ACM) but also from oceanic arc tectonic environments. The discrimination becomes more clear and explicit in Yb (ppm) versus Th/Ta diagram where the ACM- derived rocks have Th/Ta ratio between 6-20 while the arc-derived samples show the ratio greater than 20. Identification of the tectonic setting origin of the volcanic can also be done using spider diagrams of selected trace elements, but it is not possible based on spider diagrams of REE. The geochemical signatures of Pasaman volcanic give evidence that Sumatra actually is not a homogenous Segment of Gondwana-derived continental blocks, but consists of two different Segments including ACM and arc tectonic settings. These evidences strengthen previous studies results in Lampung, Bengkulu and Central Sumatra.
L U Yizhe - One of the best experts on this subject based on the ideXlab platform.
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cumulative difference method on Homogeneous Segment definition of flight testing data
Journal of Detection and Control, 2011Co-Authors: L U YizheAbstract:When using the subsection-average method,valid data will be lost during processing massive data flux.The Homogeneous Segment definition solution for flight testing data based on cumulative difference method was proposed.By this method,the extreme values could easily be found and the boundaries also be determined in these data Segments.The optimum design example showed that the Homogeneous Segment definition method was an effective way for date compression and fast processing without original information lossing when analyzing flight testing data.
Krzysztof Szajowski - One of the best experts on this subject based on the ideXlab platform.
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optimal detection of Homogeneous Segment of observations in stochastic sequence
arXiv: Probability, 2008Co-Authors: Wojciech Sarnowski, Krzysztof SzajowskiAbstract:A Markov process is registered. At random moment $\theta$ the distribution of observed sequence changes. Using probability maximizing approach the optimal stopping rule for detecting the change is identified. Some explicit solution is obtained.
Juan F Granada - One of the best experts on this subject based on the ideXlab platform.
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tissue uptake distribution and healing response after delivery of paclitaxel via second generation iopromide based balloon coating a comparison with the first generation technology in the iliofemoral porcine model
Jacc-cardiovascular Interventions, 2013Co-Authors: Piotr P Buszman, Armando Tellez, Maxwell Afari, Athanasios Peppas, Gerard Conditt, Serge Rousselle, Jennifer C Mcgregor, Mark Stenoien, Greg L Kaluza, Juan F GranadaAbstract:Objectives This study sought to evaluate vascular drug uptake, distribution and response of second-generation paclitaxel coated balloon (PCB) (Cotavance, MEDRAD Interventional, Indianola, Pennsylvania) and compare it with first-generation technology, containing identical excipient and drug concentration. Background Original PCB technologies displayed a heterogeneous deposition of crystalline paclitaxel-iopromide inside the balloon folds, whereas second-generation PCBs consisted of more Homogeneous, circumferential coatings. Methods Paclitaxel tissue uptake was assessed in 20 iliofemoral arteries of a domestic swine. Vascular healing response was assessed in the familial hypercholesterolemic model of iliofemoral in-stent restenosis. Three weeks after bare-metal stent implantation, vascular Segments were randomly revascularized with first-generation PCBs (n = 6), second-generation PCBs (n = 6), or plain balloon angioplasty (PBA) (n = 6). At 28 days, angiographic and histological evaluation was performed in all treated Segments. Results One-hour paclitaxel tissue uptake was 42% higher in the second-generation PCBs (p = 0.03) and resulted in more Homogeneous Segment-to-Segment distribution compared with first-generation PCBs. Both angiography (percentage of diameter stenosis: second-generation 11.5 ± 11% vs. first-generation 21.9 ± 11% vs. PBA 46.5 ± 10%; p Conclusions In the experimental setting, second-generation PCB showed a comparable efficacy profile and more favorable vascular healing response when compared to first-generation PCB. The clinical implications of these findings require further investigation.
Wojciech Sarnowski - One of the best experts on this subject based on the ideXlab platform.
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optimal detection of Homogeneous Segment of observations in stochastic sequence
arXiv: Probability, 2008Co-Authors: Wojciech Sarnowski, Krzysztof SzajowskiAbstract:A Markov process is registered. At random moment $\theta$ the distribution of observed sequence changes. Using probability maximizing approach the optimal stopping rule for detecting the change is identified. Some explicit solution is obtained.