Hasil Pencarian  ::  Simpan CSV :: Kembali

"Kecepatan gelombang nadi (Pulse wave velocity, PWV) diukur pada 25 subyek laki-laki bukan perokok dan dibandingkan dengan subyek perokok sebelum dan segera sesudah merokok. Tekanan darah, frekuensi nadi dan PWV tidak berbeda pada kedua kelompok sebelum merokok. Setelah merokok terjadi peningkatan tekanan darah, frekuensi nadi dan PWV pada segmen Aorta-Radialis (Ao-Rad) dan Femoral-Dorsalis pedis (Fem-Dp), tapi pada segmen Aorta-Femoralis (Ao-Fem) terjadi penurunan PWV. Hal ini menunjukkan segmen arteri sentral dan perifer memberi respons yang berbeda terhadap merokok. (Med J Indones 2002; 11: 207-10)

---

Pulse wave velocity (PWV) was recorded in different arterial segments in 25 male nonsmokers and compared with age and sex matched smokers before and after smoking. Blood pressure (BP), Heart rate (HR) and PWV were comparable between nonsmokers and smokers before smoking. Just after cigarette smoking there was rise in HR, BP and PWV in Aorta to Radial (Ao-Rad), and femoral to Dorsalis Pedis (Fem-Dp) arterial segments, but the PWV was reduced in Aorta to Femoral (Ao-Fem) arterial segment, indicating that both peripheral and central arterial segments show different response to smoking. (Med J Indones 2002; 11: 207-10)"

"Beton merupakan suatu material yang secara harfiah menjadi kebutuhan masyarakat terhadap fasilitas infrastruktur konstruksi yang semakin meningkat seiring dengan perkembangan zaman. Pengujian beton dengan metode non destructive test di zaman sekarang ini sangat dibutuhkan dalam mengevaluasi kondisi beton pada suatu konstruksi, sehingga bisa mengurangi resiko kerugian akibat pengujian dengan metode destructive test. Penelitian ini adalah penelitian eksperimental dengan mencari nilai shear wave velocity dan longitudinal wave velocity dengan kuat lentur beton. Nilai shear wave velocity didapatkan dari pengujian menggunakan alat A-1040 MIRA dan nilai longitudinal wave velocity didapakan dari pengujian menggunakan alat UPV. Pengujian ini dilakukan dengan beton yang memiliki mutu K-175, K-250, dan K-350. Hasil dari penelitian ini menunjukkan bahwa nilai shear wave velocity dan nilai longitudinal wave velocity berbanding lurus dengan kuat lentur beton.

---

Concrete is a material that now becomes a communitys need for construction infrastructure facilities that are increasing along with the times. Concrete testing with non destructive test methods today is needed to evaluate concrete in a construction, so we can reduce the risk of loss due to testing with destructive methods. This research is experimental research by looking the value of shear wave velocity and longitudinal wave velocity with concrete flexural strength. The value of shear wave velocity were obtained from the test using the A-1040 MIRA and the value of longitudinal wave velocity were obtained from the test using UPV tool. Test were performed on concrete with quality K-175, K-250, and K-350. The results of this study indicate that the shear wave velocity and longitudinal wave velocity is directly proportional to the flexural strength of the concrete. "

"Permasalahan yang muncul dalam mengkaraterisasi reservoar karbonat adalah heterogenitas dari sifat fisis porositas batuan. Karakterisasi batuan menjadi sulit karena estimasi kecepatan gelombang shear Vs yang digunakan cenderung kepada tipe pori dominan. Ada tiga jenis tipe pori utama di dalam geofisika yaitu interparticle reference pores stiff pores dan cracks. Semua jenis tipe pori tersebut secara umum dapat ditemukan pada reservoar karbonat dengan demikian sehingga reservoar karbonat menjadi kompleks. Di tugas akhir ini kami melakukan penelitian terhadap tipe pori yang ada pada reservoir karbonat di Jawa Timur dengan menggunakan template rock physics untuk menganalisis pengaruh tipe pori pada sifat elastisitas batuan. Berdasarkan hal ini jumlah volume fraction dari tipe pori yang beragam dapat diestimasi menggunakan data log porositas-bulk dan kecepatan gelombang pressure dari data sumur Data-data tersebut dapat akan digunakan sebagai input untuk melakukan inversi tipe pori. Hasil dari inversi tipe pori dapat digunakan untuk mengidentifikasi tipe pori dan persentase pada masing-masing titik pengamatan dari zona target dalam bentuk log tipe pori Variasi nilai persentase dan jenis tipe pori ditampillkan di data hasil. Data hasil ini membuktikan bahwa adanya kompleksitas tipe pori reservoar karbonat di Jawa Timur Kompleksitas tipe pori dapat digunakan untuk membuat prediksi kecepatan gelombang shear Vs

---

The problem that occurs in characterizing carbonate reservoir is the heterogeneity from physical properties of rocks porosity. Rocks characterization becomes difficult because the estimation of shear wave which has been used tend to dominant pore types. There are three types of main pores in geophysics which are interparticle (reference pores), stiff pores, and microcracks. All that pore types generally can be found in reservoir carbonate thus caused the reservoir becomes complicated. In this thesis, we do the research on the type of existing pores in East Java carbonat reservoir using rock physics template to be able to analyze influence of the type of pores on the elastic properties rocks. Based on this, the number of the volume fraction of the various pore types can be estimated using log data of bulk porosity and P - wave velocity from well data. Those data will be used as input to perform pore - type inversion. The result of pore types inversion that has been carried out to identify types of pores and percentage at each point of observation of the target zone in form of a pore types log. Variations in the value of percentage and kind of pore types are shown in the result data. This data is proving that the type of pore heterogenity in East Java carbonat reservoir from sample to sample. Pore types log data can be used to predict shear wave velocity."

"Indonesia merupakan salah satu negara dengan aktifitas tektonik yang tinggi. Parameter untuk memprediksi gerakan tanah menjadi sangat penting untuk diteliti. Salah satu parameter yang digunakan untuk memprediksi gerakan tanah adalah cepat rambat gelombang tanah (VS30). Namun di Indonesia ketersediaan data VS30 masih belum mencukupi dikarenakan mahalnya biaya dan waktu pelaksanaan yang relative lebih lama untuk melakukan uji VS30. Perhitungan nilai VS30 dengan pendekatan tertentu kemudian menjadi sebuah solusi yang dapat digunakan untuk memprediksi nilai VS30, salah satunya adalah dengan pendekatan topografi. Teori Allen dan Wald sebagai salah satu peneliti yang menyatakan bahwa nilai slope berbanding lurus dengan nilai VS30 menjadi dasar yang digunakan dalam penelitian ini yang bertujuan untuk mencari model yang sesuai dengan tanah di wilayah Indonesia. Dengan menggunakan 380 data dari titik pengujian MASW yang dikumpulkan dari peneliti sebelumnya dan tersebar di 9 wilayah di Indonesia dan nilai slope serta elevasi yang didapat dari peta topografi SRTM 30 1 arcsecond yang kemudian diolah menggunakan software ArcGIS, pemodelan berbasis slope didapatkan dengan menggunakan metode analisis bivariat dan dievalusi berdasarkan nilai standar deviasi, median serta diagram histogram hasil residu perbandingan VS30 MASW dengan hasil estimasi. Hasil analisis menunjukan bahwa model terbaik didapat dengan mengkorelasikan nilai VS30 dengan slope sesuai dengan elevasinya per 100 meter tanpa menyertakan nilai yang dianggap sebagai slope. Elevasi dibagi menjadi per 100 meter untuk menciptakan model yang baik. Hubungan elevasi dan slope dapat dibuat dalam persamaan log(Vc30) = 2,724 + 0, 192 log(Lr) dengan hasil standar deviasi 0,167 dan merupakan standar deinasi yang terendah diantara nilai lainnya.

---

Indonesia is one with highly intensity of tectonic activity area. A parameters to predict ground motion becomes very important to be studied. One of the parameters used to predict ground motion is the shear-wave velocity (VS30). However, in Indonesia the availability of VS30 data is still insufficient due to the high cost and relatively longer implementation time to conduct VS30 tests. Calculation of the VS30 value with a certain approaches then becomes a solution that can be used to predict the VS30 value, one of these is the topographic approaches. The theory by Allen and Wald as one of the researchers who stated that slope value is directly proportional to the VS30 value is the basis used in this study which aims to find a model that is suitable for soils in the Indonesian region. Using 380 data from MASW test points collected from previous researchers and spread across 9 regions in Indonesia and slope and elevation values obtained from SRTM 30 1 arcsecond topographic maps then processed using ArcGIS software, slope- based modeling was obtained using the bivariate analysis method and evaluated based on the values of standard deviation, median and histogram diagram of the residual results of MASW VS30 comparison with the estimated results. The analysis showed that the best model was obtained by correlating the VS30 values with the slope according to the elevation per 100 meters without the values considered as slopes. Elevation was divided into per 100 meters to create a good model. The relationship between elevation and slope can be made in the equation log(Vs30) = 2.724 + 0.192 log(Lr) with a standar deviation result of 0,167 and is the lowest standard devition among other values."

"Next generation ground motion prediction models use shear-wave velocity over the top 30 m of subsoil (VS30) as an important assessment parameter of seismic ground surface motion. VS30 can be measured using invasive methods, such as boreholes, or non-invasive methods, such as multichannel analysis of surface waves (MASW). To evaluate this technique in a variety of near-surface conditions, MASW-derived shear-wave velocity profiles (s-wave velocity vs. depth) were statistically compared to direct borehole measurements from three locations of Merapi sediment found on the Universitas Muhammadiyah Yogyakarta (UMY) campus site. A detailed study of the effect from the total number of recording channels of MASW, sampling intervals, source offset, and receiver spacing was conducted near the borehole test site. The soil was classified as a medium soil or SD. The MASW method, which is non-destructive and non-invasive in nature and relatively faster in assessment, provides more reliable shear-wave velocity profiles, i.e. from 0 to 30 meters below the ground surface."

"ABSTRAKBackground: periodontitis is a major cause of chronic infection in diabetic patients. Diabetic patients have four-fold risk of having cardiovascular disease. Chronic inflammation caused by periodontitis, a non-traditional cardiovascular risk factor is widely known to play a major role in atherogenesis. Among non-diabetics, an association has been found between periodontitis and arterial stiffness, but in diabetic patients the result is inconsistent. No study has investigated either the proportion of periodontitis or its correlation with arterial stiffness in type 2 diabetes population in Indonesia. Methods: this study was a cross-sectional study involving 97 patients with type 2 diabetics, who were recruited on Endocrinology Clinic from April to August 2017. Periodontitis was measured for pocket depth, clinical attachment loss and bleeding on probing by a periodontist. Carotid-femoral PWV (Pulse Wave Velocity) was measured using SphygmoCor Xcel with cuff-based tonometry technique. Results: periodontitis was found in 99% type 2 diabetic subjects and 78% of them had severe periodontitis. There was no significant correlation found between pocket depth, clinical attachment loss and cfPWV (r=0.024, p=0.407 and r=0.011, p=0.456); whereas there was a weak positive correlation between pocket depth and PWV (r=0.294, p=0.041) in well-controlled type 2 diabetics. Conclusion: most of type-2 diabetics had severe periodontitis; however, the correlation between periodontitis and arterial stiffness could not be concluded in this study."

"Pendahuluan: Kekakuan arteri merupakan prediktor mortalitas pasien hemodialisis. Hemodialisis merupakan proses yang menginduksi inflamasi, ditandai dengan peningkatan penanda inflamasi, Pentraxin 3 (PTX3), intradialisis. Rerata kekakuan arteri pada pasien HD dua kali seminggu di Indonesia menunjukkan hasil yang lebih rendah daripada literatur. Tujuan: Mengetahui faktor risiko kekakuan arteri pada pasien hemodialisis kronik dengan berfokus pada frekuensi hemodialisis dan PTX3.Metode: Penelitian ini merupakan penelitian potong lintang di RS Cipto Mangunkusumo, RS Fatmawati, dan RS Medistra pada pasien yang menjalani hemodialisis minimal 1 tahun dengan frekuensi dua dan tiga kali seminggu. Kekakuan arteri diukur dengan carotid-femoral pulse wave velocity. Pemeriksaan PTX3 dilakukan sebelum hemodialisis dimulai.Hasil: Penelitian dilakukan pada 122 subjek, 82 subjek diantaranya menjalani hemodialisis dua kali seminggu. Tidak ada perbedaan kekakuan arteri antara pasien HD 2x dan 3x seminggu. PTX3 > 2,3 ng/ml berhubungan dengan kekakuan arteri (p=0,021). Pada analisis multivariat, PTX3 berhubungan dengan kekakuan arteri (adjusted OR 5,18; IK 95% 1,07-24,91), demikian juga penyakit kardiovaskular (adjusted OR 3.67; IK 95% 1.40-10.55), kolesterol LDL (adjusted OR 3.10; IK 95% 1.04-9.24), dan dialysis vintage (adjusted OR 2.72; IK 95% 1.001-7.38).Simpulan: PTX >2,3 ng/ml berhubungan dengan kekakuan arteri. Tidak terdapat perbedaan kekakuan arteri antara pasien HD dua kali dan tiga kali seminggu.

---

Introduction: Arterial stiffness is a mortality predictor in hemodialysis patients. Hemodialysis induces inflammation, marked by intradialysis increment of inflammatory marker, Pentraxin 3 (PTX3). The mean arterial stiffness in twice-weekly hemodialysis patients in Indonesia is lower than studies done in thrice-weekly patients.

Objective: To determine factors associated with arterial stiffness in hemodialysis patients, focusing on the role of hemodialysis frequency and PTX3.

Methods: This study is a cross-sectional study conducted in Cipto Mangunkusumo Hospital, Fatmawati Hospital, and Medistra Hospital Jakarta in twice- and thrice-weekly hemodialysis patients. Arterial stiffness is measured by carotid-femoral pulse wave velocity.

Results: The study is conducted in 122 subjects, 82 of them undergo twice-weekly hemodialysis. There is no difference in arterial stiffness between twice- and thrice-weekly subjects. PTX3>2.3 ng/ml is associated with arterial stiffness (p= 0.021). In multivariate analysis, PTX3 is associated with arterial stiffness (adjusted OR 5.18; 95% CI 1.07-24.91), as well as cardiovascular disease (adjusted OR 3.67; 95% CI 1.40-10.55), LDL cholesterol (adjusted OR 3.10; 95% CI 1.04-9.24), and dialysis vintage (adjusted OR 2.72; 95%CI 1.001-7.38).

Conclusions: Predialysis PTX3 level above 2.3 ng/ml is associated with arterial stiffness. There is no difference in arterial stiffness between twice- and thrice-weekly hemodialysis patients."

"Lapangan PS merupakan lapangan eksplorasi yang terletak di Onshore Cekungan Jawa Barat Utara, kegiatan eksplorasi di lapangan PS dimulai pada tahun 1985 ketika sumur eksplorasi TR-1 dibor untuk menguji struktur didaerah utara lapangan, beberapa tahun kemudian sumur deviasi TR-2 dibor berdekatan dengan sumur TR-1 sampai ke tenggara untuk menggambarkan struktur yang sama, kemudian sumur eksplorasi TR-A1 dibor untuk prospek baru di bagian tenggara blok tersebut. Prediksi tekanan pori pada penelitian dilakukan menggunakan data log sonik dengan metode yang dikembangkan oleh Eaton. Hasil perhitungan tekanan pori dalam penelitian ini dikalibrasi dengan data tekanan sumur yaitu data tekanan berat lumpur pengeboran dimana jika terjadi penyimpangan dari trend kurva normal pada data sumur merupakan karakteristik kondisi overpressure. Penelitian ini menggunakan beberapa teknik untuk memperkirakan tekanan pori dalam tiga formasi berbeda yaitu Baturaja, Talang Akar dan Mid Main Carbonate Bagian dari Upper Cibulakan . Proses Conditioning data sudah dilakukan sebelumnya. Normal Compaction Trend NCT dianalisis pada masing-masing formasi karena litologi yang berbeda. Dari proses inversi data seismik post-stack 2D akan menghasilkan penampang AI dan penampang kecepatan, kemudian dianalisis mana yang lebih mempengaruhi perubahan tekanan pori. Dimulai dari analisis sensitivitas berdasarkan crossplot dari masing-masing parameter terhadap tekanan pori, kemudian dibuat model tekanan pori 3D berdasarkan geostatistik untuk melihat distribusi tekanan pori. Langkah akhir akan diterapkan blind test untuk menentukan parameter mana yang lebih baik untuk mendistribusikan tekanan pori, dimana parameter AI memiliki korelasi yang lebih tinggi dibandingkan parameter kecepatan dalam menyebarkan tekanan pori. Hasil analisa ini akan berguna untuk perencanaan program pengeboran selanjutnya di area studi.

---

Field is exploration field that located in the onshore of North West Java Basin, exploration activity in PS area was commenced in 1985 when TR 1 exploratory well was drilled to test PS North structure, TR 2 located in the same pad with TR 1 well, was drilled to the southeastern of TR 1 well to delineate the same structure, then TR A1 exploratory well was drilled in a new prospect in the southeastern part of the block. Pore pressure prediction below the surface can be done by using well log or seismic data. Pore pressure prediction in this research are done by using a methods developed by Eaton. The calculation result of pore pressure in this research are calibrated by well pressure data consist drilling mud pressure value over normal trend on the well data is a characteristic feature of overpressure condition.

This study uses several techniques to estimate pore pressure in three different formation that is Baturaja, Talang Akar and Mid Main Carbonate Part of Upper Cibulakan using sonic log data and resisivity data. Conditioning data process has been done beforehand. Normal Compaction Trend NCT are analyzed in each formations due to different lithology. From the post stack seismic data 2D inversion process will generate AI section and velocity section, it will be analyzed which one is more affect the pore pressure changes.

Starting from sensitivity analysis based on crossploting each parameter to pore pressure to. Then, the blind test will be applied to determine which parameters is better to distribute pore pressure, where AI parameters have a higher correlation than velocity parameters to distribute pore pressure. The result of analysis can be useful to the future drilling program in the study area."