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Journal articles on the topic 'Permeability'

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Author: Grafiati

Published: 4 June 2021

Last updated: 29 July 2024

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1

Purwantiasning, Ari Widyati, Lutfi Prayogi, Dedi Hantono, and Yeptadian Sari. "TELAAH PERMEABILITAS PADA KAWASAN BERSEJARAH CLARKE QUAY DI SINGAPURA." Nature: National Academic Journal of Architecture 9, no. 1 (June 30, 2022): 16–28. http://dx.doi.org/10.24252/nature.v9i1a2.

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Abstrak_ Dalam sebuah perencanaan kota, konsep dan teori tentang perencanaan kota menjadi penting sebagai dasar-dasar pemikirannya. Salah satu teori dan konsep yang diperkenalkan oleh Kevin Lynch adalah teori tentang permeabilitas di dalam sebuah Kawasan. Tulisan ini bertujuan untuk mengkaji tentang sebuah Kawasan bersejarah di Singapura yaitu Clarke Quay dengan menggunakan teori permeabilitas yang diperkenalkan oleh Kevin Lynch. Selain itu, penelitian ini juga bertujuan untuk memahami bagaimana sebuah Kawasan bersejarah memiliki kemampuan permeabilitas bagi penggunanya. Telaah yang telah dilaksanakan ini menggunakan metode kualitatif dengan pendekatan deskriptif naratif dengan mengangkat Kawasan Clarke Quay di Singapura sebagai studi kasus untuk dikaji menggunakan teori permeabilitas. Penelitian dilakukan selama enam bulan dan diselesaikan dengan analisis pemetaan menggunakan prinsip-prinsip permeabilitas. Hasil akhir yang dicapai adalah dengan memperlihatkan bagaimana sebuah Kawasan bersejarah harus memiliki kemampuan permeabilitas bagi penggunanya, sehingga Kawasan tersebut juga memiliki legibilitas atau kejelasan seperti yang disampaikan oleh Kevin Lynch dalam teorinya. Kata kunci : Permeabilitas; Kawasan Bersejarah; Kevin Lynch; Clarke Quay Abstract_ In an urban planning, concepts and theories about urban planning become important as the basics of thought. One of the theories and concepts introduced by Kevin Lynch is the theory of permeability in an area. This paper aims to examine a historic area in Singapore, namely Clarke Quay using the permeability theory introduced by Kevin Lynch. In addition, this study also aims to understand how a historic area has permeability capabilities for its users. This study has been carried out using a qualitative method with a descriptive narrative approach by using the Clarke Quay area in Singapore as a case study to be studied using the permeability theory. The study was conducted for six months and was completed by mapping analysis using the permeability principles. The final result achieved is to show how a historicarea must have permeability capabilities for its users, so that the area also has legitimacy or clarity as stated by Kevin Lynch in his theory. Keywords : Permeability; Historical Site; Kevin Lynch; Clarke Quay

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2

Arifin, Muhammad Amad, and Fathurrozie Fathurrozie. "Tinjauan Nilai Permeabilitas Tanah Tanggul Canal Blocking." Jurnal Gradasi Teknik Sipil 3, no. 1 (July 24, 2019): 7–14. http://dx.doi.org/10.31961/gradasi.v3i1.732.

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Air sangat berpengaruh pada sifat-sifat teknis tanah dan juga air berperan sangat penting dalam masalah-masalah teknis yang berhubungan dengan tanah yaitu permeabilitas. Permeabilitas tanah yaitu kecepatan air yang menembus tanah pada periode tertentu dan dinyatakan dalam cm/jam. Nilai permeabilitas sangat penting dalam menentukan penggunaan dan pengelolaan praktis tanah. Koefisien permeabilitas tanah memiliki nilai yang berbeda untuk berbagai jenis tanah. Ada dua macam alat untuk menentukan nilai permeabilitas, yaitu constant head permeameter dan falling head permeameter. Lokasi penelitian tanggul canal blocking berada di Hutan Lindung Liang Anggang yang terletak di Kecamatan Liang Anggang, Kota Banjarbaru, Provinsi Kalimantan Selatan. Dimana tubuh tanggul canal blocking menggunakan tanah urugan setempat (tanah gambut) dijadikan tubuh tanggul canal blocking. Tugas Akhir ini menggunakan metode survei dan pengambilan data tanah pada kawasan tanggul canal blocking. Bila dilihat nilai permeabilitasnya pada tubuh tanggul yang didapat, termasuk kelas sangat rendah yaitu kurang < 0,125 cm/jam. Jadi penggunaan tanah urugan setempat untuk dijadikan tubuh tanggul sudah cukup efektif . Water is very influential on the technical properties of soil and also water plays a very important role in the technical problems related to soil, namely permeability. Soil permeability is the speed of water that penetrates the soil in a certain period and is expressed in cm / hour. Permeability values are very important in determining the practical use and management of land. The soil permeability coefficient has different values for various types of soil. There are two types of tools for determining permeability values, namely constant permeability head and permeability falling head. The research location of the canal blocking dikes is in the Liang Anggang Protected Forest located in Liang Anggang District, Banjarbaru City, South Kalimantan Province. Where the canal blocking embankment body uses local soil (peat soil) as a canal blocking embankment body. This Final Project uses a survey and retrieval of soil data in the canal blocking embankment area. If you see the permeability value on the embankment body obtained, including the class is very low, which is less than 0.125 cm / hour. So the use of local land to be used for embankment is quite effective.

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3

Chen, Philip, and Gregorius Sandjadja Sentosa. "ANALISIS PERBANDINGAN NILAI KOEFISIEN PERMEABILITAS TANAH UJI LAPANGAN DAN UJI LABORATORIUM." JMTS: Jurnal Mitra Teknik Sipil 3, no. 1 (February 25, 2020): 97. http://dx.doi.org/10.24912/jmts.v3i1.7071.

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The coefficient of permeability (k) results of pumping tests are used as initial data to determine the rate of water seepage in the soil, determining the permeability capability of the soil can be done by measurements in the laboratory and in the field. In reality the permeability coefficient value of field test is not the same as the test in the laboratory. This final project will analyze the difference in value (k) obtained from field and laboratory tests in order to enrich the data in determining the value of permeability coefficient (k). The analysis uses Thiem and Theis method in analyzing the results of pumping tests. And using constant head permeameter to determine the value of the coefficient of permeability (k) in laboratory. From the analysis results obtained by the Thiem method, the permeability coefficient (k) obtained is in the range of 6,8x cm/sec - 2,8x cm/sec, and Theis method is obtained in the range of 6,03x cm/sec - 6,03x cm/sec. Meanwhile the results of the coefficient of soil permeability (k) by the laboratory tests using the constant head permeameter is in the range 1,43x cm/sec - 8,76x cm/sec. And for calculations using the Hazen method the result is in the range 8,71x cm/sec - 4,35x cm/sec.AbstrakNilai koefisien permeabilitas (k) hasil pumping test digunakan sebagai data awal untuk mengetahui kecepatan rembesan air di dalam tanah, penentuan kemampuan permeabilitas tanah dapat dilakukan dengan pengukuran di laboratorium dan di lapangan. Dalam kenyataannya nilai koefisien permeabilitas uji lapangan biasanya tidak sama dengan uji di laboratorium. Penelitian ini akan menganalisa perbedaan nilai (k) yang didapat dari uji lapangan dan uji laboratorium guna memperkaya data dalam menentukan nikai koefisien permeabilitas (k). Analisa pada penelitian ini menggunakan metode Thiem dan metode Theis dalam menganalisa hasil pumping test pada lapangan. Dan menggunakan constant head permeameter sebagai alat menentukan nilai koefisien permeabilitas (k) pada laboratorium. Serta menggunakan metode rumus empiris Hazen untuk menentukan nilai koefisien permeabilitas (k) berdasarkan ukuran butiran. Dari hasil analisis yang diperoleh dengan metode Thiem nilai koefisien permeabilitas (k) yang didapat berada pada rentang 6,8x m/detik - 2,8x cm/detik, dan dengan metode Theis didapat pada rentang 6,03x cm/detik - 6,03x cm/detik. Sedangkan hasil uji laboratorium menggunakan permeameter constant head mendapatkan hasil nilai koefisien permeabilitas tanah (k) pada rentang 1,43x cm/detik - 8,76x cm/detik. Dan didapat hasil 8,71x cm/detik - 4,35x cm/detik untuk perhitungan menggunakan metode Hazen.

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4

Halauddin, Halauddin, Suhendra Suhendra, and Muhammad Isa. "Lattice Gas Automata Applications to Estimate Effective Porosity and Permeability Barrier Model of the Triangle with a Height Variation." Journal of Aceh Physics Society 9, no. 2 (May 1, 2020): 48–54. http://dx.doi.org/10.24815/jacps.v9i2.16056.

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Penelitian ini bertujuan untuk menghitung porositas efektif (фeff) dan permeabilitas (k) menggunakan model segitiga dengan variasi tinggi yaitu 3, 4, 5, 6 dan 7 cm. Perhitungan porositas dan permeabilitas yang efektif dilakukan dengan menggunakan model Lattice Gas Automata (LGA), yang diimplementasikan dengan bahasa pemrograman Delphi 7.0. Untuk model segitiga penghalang dengan tinggi 3, 4, 5, 6 dan 7 cm, nilai porositas efektif dan permeabilitas, masing-masing: фeff (T1) = 0,1690, k (T1) = 0 , 001339 pixel2; фeff (T2) = 0,1841, k (T2) = 0,001904 pixel2; фeff (T3) = 0,1885, k (T3) = 0,001904 pixel2; фeff (T4) = 0,1938, k (T4) = 0001925 pixel2; dan фeff (T5) = 0,2053, k (T5) = 0,002400 pixel2. Dari hasil simulasi, diperoleh tinggi segitiga akan berpengaruh signifikan terhadap nilai porositas efektif dan permeabilitas. Pada segitiga lebih tinggi, menyebabkan tabrakan model aliran fluida LGA mengalami lebih banyak hambatan untuk penghalang, sehingga porositas efektif dan permeabilitas menurun. Sebaliknya, jika segitiga lebih rendah, menyebabkan tabrakan model aliran fluida LGA mengalami lebih sedikit hambatan untuk penghalang, sehingga porositas efektif dan permeabilitas meningkat.This research purposed to calculate the effective porosity (feff) and permeability (k) using the barrier model of the triangle with a high varying are 3, 4, 5, 6 and 7 cm. Effective porosity and permeability calculations performed using the model Lattice Gas Automata (LGA), which is implemented with Delphi 7.0 programming language. For model the barrier triangle with a high of 3, 4, 5, 6 and 7 cm, the value of effective porosity and permeability, respectively: feff(T1)=0,1690, k(T1)=0,001339 pixel2; feff(T2)=0,1841, k(T2)=0,001904 pixel2; feff(T3)=0,1885, k(T3)=0,001904 pixel2; feff(T4)=0,1938, k(T4)= 0001925 pixel2; and feff(T5)=0,2053, k(T5)=0,002400 pixel2. From the simulation results, obtained by the high of the triangle will be a significant effect on the value of effective porosity and permeability. If the triangle highest, causing the collision of fluid flow models LGA experience more obstacles to the barrier, so that the effective porosity and permeability decrease. Conversely, if the triangle lower, causing the collision of fluid flow models LGA experience less obstacles to the barrier, so that the effective porosity and permeability increases.Keywords: Effective porosity, permeability, model triangle, model LGA

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Luandra, Muhammad Ricky, and Totoh Andayono. "Hubungan Sifat Fisik Tanah dan Permeabilitas Tanah Pada Daerah Permukiman di Kecamatan Koto Tangah." CIVED 8, no. 2 (September 4, 2021): 60. http://dx.doi.org/10.24036/cived.v8i2.112177.

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Penelitian ini bertujuan untuk mengetahui hubungan antara sifat fisik tanah terhadap nilai permeabilitas tanah pada permukiman di Kecamatan Koto Tangah. Penelitian ini merupakan penelitian kuantitatif dengan pendekatan secara korelasioanal. Data yang digunakan berupa data primer yang didapatkan di lapangan serta di laboratorium dan data sekunder dedapatkan pada literatur atau arsip pemerintahan kemudian diolalah menggunakan QGIS. Data primer tersebut berupa kadar air tanah, berat jenis tanah, berat isi tanah, dan permeabilitas tanah, sedangkan data sekunder berupa denah lokasi penelitian. Didapatkan nilai signifikansi hubungan kadar air tanah dengan permeabilitas tanah sebesar 0,004 dan di peroleh R²sebesar 0,662 serta arah hubungan negatif, nilai signifikansi hubungan berat isi tanah dengan permeabilitas tanah sebesar 0,023 dan di peroleh R² sebesar 0,498 serta arah hubungannya negatif, sedangkan nilai signifikansi hubungan berat jenis tanah dengan permeabilitas sebesar 0,239. Sehingga dapat disimpulkan hubungan sifat fisik tanah dengan permeabilitas tanah mempunyai hubungan yang signifikan (berarti).This study aims to determine the relationship between the physical properties of the soil to the value of soil permeability in settlements in Koto Tangah District. This research is a quantitative study with a correlation approach. The data used are primary data obtained in the field as well as in the laboratory and secondary data obtained in literature or government archives which are then processed using QGIS. The primary data is in the form of soil water content, soil density, soil density, and soil permeability, while secondary data is in the form of a plan of the research location. The significance value of the relationship between groundwater content and soil permeability was 0.004 and obtained R² of 0.662 and the direction of the negative relationship, the significance value of the relationship between soil weight and soil permeability was 0.023 and obtained R² of 0.498 and the direction of the relationship was negative, while the significance value of the relationship of density soil with a permeability of 0.239. So it can be concluded that the relationship between the physical properties of the soil and the permeability of the soil have a significant relationship (meaning).

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6

Damayanti, Nita. "Peran Vitamin D pada Fungsi Sawar Permeabilitas Kulit." Cermin Dunia Kedokteran 48, no. 10 (October 1, 2021): 415–20. http://dx.doi.org/10.55175/cdk.v48i10.139.

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Salah satu fungsi utama kulit adalah membentuk sawar antara tubuh dan lingkungan eksternal. Fungsi sawar permeabilitas kulit salah satunya dipertahankan dengan proses diferensiasi dan proliferasi keratinosit pada lapisan epidermis. Efek vitamin D pada kulit termasuk memengaruhi proliferasi, diferensiasi, dan apoptosis keratinosit. Defisiensi serta kelainan aktivasi dan metabolisme vitamin D menyebabkan defek fungsi sawar permeabilitas kulit. Makalah ini membahas epidermis sebagai sawar permeabilitas kulit dan peran vitamin D pada sawar permeabilitas kulit. One of the skin’s main functions is to form a protective barrier towards external environment. The protective function is maintained by differentiation and proliferation of keratinocytes in the epidermal layer. Vitamin D effects on the skin include proliferation, differentiation, and apoptosis of keratinocyte. Deficiency and abnormalities of vitamin D activation and metabolism impair skin’s function as permeability barrier. This paper discusses the epidermis as permeability barrier and the role of vitamin D in the skin permeability barrier.

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Damayanti, Nita. "Peran Vitamin D pada Fungsi Sawar Permeabilitas Kulit." Cermin Dunia Kedokteran 48, no. 10 (October 25, 2021): 415. http://dx.doi.org/10.55175/cdk.v48i10.1515.

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<p>Salah satu fungsi utama kulit adalah membentuk sawar antara tubuh dan lingkungan eksternal. Fungsi sawar permeabilitas kulit salah satunya dipertahankan dengan proses diferensiasi dan proliferasi keratinosit pada lapisan epidermis. Efek vitamin D pada kulit termasuk memengaruhi proliferasi, diferensiasi, apoptosis keratinosit. Defisiensi serta kelainan aktivasi dan metabolisme vitamin D menyebabkan defek fungsi sawar permeabilitas kulit. Makalah ini membahas epidermis sebagai sawar permeabilitas kulit dan peran vitamin D pada sawar permeabilitas kulit.</p><p>One of the skin’s main functions is to form a protective barrier towards external environment. The protective function is maintained by differentiation and proliferation of keratinocytes in the epidermal layer. Vitamin D effects on the skin include proliferation, differentiation and apoptosis of keratinocyte. Deficiency and abnormalities of vitamin D activation and metabolism impair skin’s function as permeability barrier. This paper discusses the epidermis as permeability barrier and the role of vitamin D in the skin permeability barrier.</p>

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Michel, C. C., and F. E. Curry. "Microvascular Permeability." Physiological Reviews 79, no. 3 (July 1, 1999): 703–61. http://dx.doi.org/10.1152/physrev.1999.79.3.703.

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This review addresses classical questions concerning microvascular permeabiltiy in the light of recent experimental work on intact microvascular beds, single perfused microvessels, and endothelial cell cultures. Analyses, based on ultrastructural data from serial sections of the clefts between the endothelial cells of microvessels with continuous walls, conform to the hypothesis that different permeabilities to water and small hydrophilic solutes in microvessels of different tissues can be accounted for by tortuous three-dimensional pathways that pass through breaks in the junctional strands. A fiber matrix ultrafilter at the luminal entrance to the clefts is essential if microvascular walls are to retain their low permeability to macromolecules. Quantitative estimates of exchange through the channels in the endothelial cell membranes suggest that these contribute little to the permeability of most but not all microvessels. The arguments against the convective transport of macromolecules through porous pathways and for the passage of macromolecules by transcytosis via mechanisms linked to the integrity of endothelial vesicles are evaluated. Finally, intracellular signaling mechanisms implicated in transient increases in venular microvessel permeability such as occur in acute inflammation are reviewed in relation to studies of the molecular mechanisms involved in signal transduction in cultured endothelial cells.

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Geraldine, Vanessa Aulia, and Nedyomukti Imam Syafii. "Pengaruh Kepadatan Bangunan Terhadap Permeabilitas pada Rumah Sakit di Indonesia." NALARs 22, no. 2 (July 9, 2023): 117. http://dx.doi.org/10.24853/nalars.22.2.117-128.

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ABSTRAK. Seiring dengan pertumbuhan jumlah penduduk di Indonesia peningkatan akan kebutuhan layanan kesehatan juga semakin meningkat, khususnya kebutuhan rumah sakit. Rumah Sakit Paru dr Ario Wirawan (RSPAW) Salatiga saat ini sedang dalam tahap perencanaan untuk pembangunan. Pembangunan rumah sakit ini akan mempengaruhi kepadatan bangunan yang ada di kawasan eksisting. Berdasarkan penelitian terdahulu bahwa densitas bangunan memiliki pengaruh besar terhadap iklim mikro disekitarnya khususnya terhadap permeabilitas angin pada kawasan. Penelitian ini bertujuan untuk mengetahui pengaruh berbagai densitas bangunan untuk mengoptimalkan permeabilitas kawasan agar sirkulasi udara dapat terdistribusi dengan optimal pada kawasan Rumah Sakit Paru dr Ario Wirawan. Penelitian ini akan menggunakan metode simulasi dengan Rhinoceros sebagai perangkat permodelan yang akan dilanjutkan dengan metode analisis CFD dari perangkat tambahan Grasshopper. Selanjutnya, untuk melakukan analisis simulasi CFD akan menggunakan salah satu perangkat bagian dari Ladybug Tools yaitu Butterfly. Hasil penelitian menunjukkan apabila pada kawasan RSPAW melakukan pengembangan dengan menambah kepadatan bangunan tanpa mempertimbangkan permeabilitas akan menurunkan kecepatan angin rata-ratanya. Permeabilitas yang dianjurkan adalah minimal 70% untuk mencapai kategori dapat diterima berdasarkan standar kenyamanan angin. Sedangkan untuk permeabilitas dibawah 70% dianggap kurang menguntungkan. Meskipun begitu, permeabilitas minimal 85% telah terbukti lebih baik pada kedua arah datang angin untuk dapat masuk kategori dapat diterima. Kata kunci: rumah sakit, permeabilitas udara, kepadatan bangunan, iklim mikro ABSTRACT. Along with population growth in Indonesia, the need for health services is also increasing, especially for hospitals. Dr. Ario Wirawan's Pulmonary Hospital is currently in the process of planning to develop. The development of this hospital will affect the density of existing buildings in the existing area; based on previous research, the density of buildings significantly influences the surrounding microclimate, especially wind permeability in the area. This study aims to determine the effect of various building densities to optimize the permeability of the area so that air circulation can be optimally distributed in the area of Dr. Ario Wirawan Lung Hospital. A simulation method with a quantitative approach will be used. This research will use Rhinoceros as a modeling tool followed by the CFD analysis method from Grasshopper enhancement.Furthermore, this research will use Ladybug Tools and Butterfly plugin to analyze the CFD simulation. The results show that if the RSPAW area develops by increasing the density of buildings without considering the permeability will reduce the average wind speed. The recommended permeability percentage is at least 70% to reach an acceptable category based on wind comfort standards, as more than 70% is acceptable. However, the permeability of at least 85% is better in both wind directions, being acceptable. Keywords: hospital, wind permeability, building density, microclimate

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AKBEROVA, D. R., A. KH ODINTSОVA, and D. I. ABDULGANIEVA. "Evaluation of intestinal permeability by triple sugar test in patients with autoimmune liver diseases." Practical medicine 21, no. 3 (2023): 48–54. http://dx.doi.org/10.32000/2072-1757-2023-3-48-54.

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We evaluated intestinal permeability by triple sugar test in patients with autoimmune liver diseases. Patients were divided into groups with autoimmune hepatitis, primary biliary cholangitis and overlap syndrome (autoimmune hepatitis/primary biliary cholangitis). 102 people were included in the cross-sectional study: 72 patients with autoimmune liver diseases and 30 healthy volunteers. Diagnose based on recommendations — EASL (2017), AASLD (2019), IAIHG (2021). Small intestine permeability was evaluated by the ratio of lactulose/mannitol in urine, large bowel permeability by the level of sucralose in urine (nmol/l). We used the method of high-performance liquid chromatography–mass spectrometry. Patients with autoimmune liver diseases had increased small intestine permeability – 0.12 [0.07; 0.234] (p < 0.001) compared to the control group — 0.013 [0.01; 0.025]. Large bowel permeability — 760.8 [386.4; 1640] nmol/l did not differ from group control — 785.6 [408; 1027.2]. Increased small intestine permeabilityin patients with autoimmune liver diseases: stage of hepatitis — 0.17 [0.118; 0.253] (p < 0.001), liver cirrhosis — 0.106 [0.07; 0.23] (p < 0.001) compared with the control group. Large bowel permeability in patients with hepatitis and in liver cirrhosis did not differ from control group. Increased values of the triple sugar test were detected in patients with autoimmune hepatitis (increased permeability of the small intestine (0,09 [0,07; 0,17] (p < 0.05), increased permeability of large bowel — 1091,2 [760; 2352] (p < 0.05)) and overlap syndrome (increased small intestine permeability — 0.18 [0,086; 0,3] (p < 0,05) and increased large bowel permeability — 880 [424; 1680] (p < 0,05)) at the stage of liver cirrhosis. Patients with autoimmune liver diseases show the increased permeability of the small intestine. The presence of increased permeability of the small and large intestine may indicate the progression of the disease.

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Klausner, J. M., S. Abu-Abid, J. S. Alexander, R. Hanshke-Mineau, G. Goldman, N. Morel, C. R. Valeri, D. Shepro, and H. B. Hechtman. "Thromboxane Modulates Endothelial Permeability." Mediators of Inflammation 3, no. 2 (1994): 149–53. http://dx.doi.org/10.1155/s0962935194000190.

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The study tests the role of thromboxane in modulating microvascular permeabilityin vitro. Cultured monolayers of bovine aortic endothelial cells were challenged with the thromboxane (Tx) mimic U46619. This led to disassembly of actin microfilaments, cell rounding, border retraction and interendotheHal gap formation. Pretreatment with the Tx receptor antagonist SQ 29,548 prevented the Tx mimic-induced cytoskeletal changes. The Tx mimic also altered endothelial cell barrier function. Increased permeability was indicated by the increased passage of labelled albumin across monolayers cultured on microcarriers, relative to untreated endothelial cells (p<0.05). Furthermore, electron microscopy of endothelial cells cultured on the basement membrane of human placental amnion indicated increased permeability based on wide, interendotheHal gap formation and transit of the tracer horseradish peroxidase. Quantification of interendothelial gaps revealed an eleven-fold increase with the Tx mimic relative to untreated endothial cells (p<0.05) and prevention by pretreatment with the Tx receptor antagonist (p<0.05). These data indicate that Tx directly modulates the permeability of endothelial cellin vitro.

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Stamps, Arthur E. "Visual Permeability, Locomotive Permeability, Safety, and Enclosure." Environment and Behavior 37, no. 5 (September 2005): 587–619. http://dx.doi.org/10.1177/0013916505276741.

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Al-Doury, M. M. I. "A Discussion About Hydraulic Permeability and Permeability." Petroleum Science and Technology 28, no. 17 (September 21, 2010): 1740–49. http://dx.doi.org/10.1080/10916460903261715.

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Herawaty, Fitri, Mustafril Mustafril, and Dewi Sri Jayanti. "Analisa Pola Penyebaran Aliran Air Tanah Pada Model Tanggul." Rona Teknik Pertanian 7, no. 2 (October 1, 2014): 136–49. http://dx.doi.org/10.17969/rtp.v7i2.2680.

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Abstrak. Rembesan merupakan salah satu masalah yang sering terjadi pada tanggul. Besarnya rembesan sangat dipengaruhi oleh sifat permeabilitas tanah. Permeabilitas tanah akan menurun dengan meningkatnya kadar air dalam tanah. Rembesan yang terjadi pada tanggul akan membentuk suatu pola aliran air di dalam tubuh tanggul. Rembesan air akan berjalan sejajar dengan garis muka air tanah sehingga garis rembesan juga merupakan garis aliran. Sehingga garis-garis equipotensial akan memotong garis rembesan ini sehingga jarak vertikal antara perpotongan adalah sama. Hasil yang diperoleh menunjukkan bahwa nilai debit rembesan berdasarkan rumus empiris jauh lebih kecil dibandingkan dengan metode pengukuran langsung dan program SEEP/W. Hal ini disebabkan karena pada metode empiris selain faktor permeabilitas dan dimensi tanggul, juga dipengaruhi oleh panjang zona basah. Sebaliknya, pada pengukuran secara langsung dan metode analisis dengan program SEEP/W, debit rembesan hanya dipengaruhi oleh nilai permeabilitas, tinggi muka air dan dimensi tanggul, sedangkan panjang zona basah tidak berpengaruh Analyses of Spreading Seepage Pattern on Embankment Model Abstract. Seepage are one problem that often occurs in the embankment. The magnitude of seepage is greatly influenced by the soil permeability characteristic. Soil permeability would decreased with increasing water content in the soil. Seepage that occurs in embankments would form a pattern of water flow inside the embankment. Seepage water will run parallel with the water levels line so that seepage is also a flow line. So that the equipotential lines will cut the line permeability so that the vertical distance between the intersections is the same. The results obtained indicate that the seepage discharge based on empirical formula smaller than the direct measurement method and program SEEP/W. This is due because of at the empirical method besides permeability and embankment dimension, also influenced by length of wet zone. In contrast, the direct measurement and analysis methods with the program SEEP/W, seepage discharge is only affected by the value of the permeability, water levels and embankment dimensions, while the length of wet zone does not effect.

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Gavrilovskaya, Irina N., Elena E. Gorbunova, Natalie A. Mackow, and Erich R. Mackow. "Hantaviruses Direct Endothelial Cell Permeability by Sensitizing Cells to the Vascular Permeability Factor VEGF, while Angiopoietin 1 and Sphingosine 1-Phosphate Inhibit Hantavirus-Directed Permeability." Journal of Virology 82, no. 12 (March 26, 2008): 5797–806. http://dx.doi.org/10.1128/jvi.02397-07.

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ABSTRACT Hantaviruses infect human endothelial cells and cause two vascular permeability-based diseases: hemorrhagic fever with renal syndrome and hantavirus pulmonary syndrome. Hantavirus infection alone does not permeabilize endothelial cell monolayers. However, pathogenic hantaviruses inhibit the function of αvβ3 integrins on endothelial cells, and hemorrhagic disease and vascular permeability deficits are consequences of dysfunctional β3 integrins that normally regulate permeabilizing vascular endothelial growth factor (VEGF) responses. Here we show that pathogenic Hantaan, Andes, and New York-1 hantaviruses dramatically enhance the permeability of endothelial cells in response to VEGF, while the nonpathogenic hantaviruses Prospect Hill and Tula have no effect on endothelial cell permeability. Pathogenic hantaviruses directed endothelial cell permeability 2 to 3 days postinfection, coincident with pathogenic hantavirus inhibition of αvβ3 integrin functions, and hantavirus-directed permeability was inhibited by antibodies to VEGF receptor 2 (VEGFR2). These studies demonstrate that pathogenic hantaviruses, similar to αvβ3 integrin-deficient cells, specifically enhance VEGF-directed permeabilizing responses. Using the hantavirus permeability assay we further demonstrate that the endothelial-cell-specific growth factor angiopoietin 1 (Ang-1) and the platelet-derived lipid mediator sphingosine 1-phosphate (S1P) inhibit hantavirus directed endothelial cell permeability at physiologic concentrations. These results demonstrate the utility of a hantavirus permeability assay and rationalize the testing of Ang-1, S1P, and antibodies to VEGFR2 as potential hantavirus therapeutics. The central importance of β3 integrins and VEGF responses in vascular leak and hemorrhagic disease further suggest that altering β3 or VEGF responses may be a common feature of additional viral hemorrhagic diseases. As a result, our findings provide a potential mechanism for vascular leakage after infection by pathogenic hantaviruses and the means to inhibit hantavirus-directed endothelial cell permeability that may be applicable to additional vascular leak syndromes.

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Rizky, Chandra Budhi, and Priyanto Saelan. "Studi Mengenai Pengaruh Faktor Air-Semen dan Nilai Slump Beton Segar terhadap Permeabilitas Beton. (Hal. 33-40)." RekaRacana: Jurnal Teknil Sipil 5, no. 4 (December 2, 2019): 33. http://dx.doi.org/10.26760/rekaracana.v5i4.33.

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Abstrak Permeabilitas beton memiliki peran penting dalam mempertahankan umur suatu struktur bangunan, serta dipengaruhi oleh faktor air-semen, dan porositas beton. Dari suatu nilai faktor air-semen yang sama maka dapat dibuat campuran beton dengan nilai slump yang berbeda. Nilai slump yang berbeda membutuhkan jumlah air yang berbeda hal ini diduga akan mengakibat nilai koefiesien permeabilitas yang lebih tinggi. Penelitian ini dilakukan dengan membuat campuran beton menggunakan cara Dreux Gorrise - ITENAS, untuk faktor granular [G] 0,55; faktor air-semen 0,4; 0,5; dan 0,6; serta slump rencana 30-60 mm dan 60-180 mm. Hasil penelitian ini menunjukan grafik hubungan antara faktor air-semen dan nilai slump dengan nilai koefisien permeabilitas. Hasil dari grafik menunjukan faktor air-semen 0,5 dengan nilai slump 30-60 mm nilai koefisien permeabilitasnya adalah 5,790 x 10-9 m/dtk. Sedangkan untuk faktor air-semen 0,5 dengan nilai slump 60-180 mm nilai koefisien permeabilitasnya adalah 7,674 x 10-9 m/dtk. Kata kunci: permeabilitas beton, porositas beton, nilai slump, faktor air-semen Abstract Permeability of concrete has an important role in maintaining the life of a building structure, also influenced by a water-cement ratio and porosity of the concrete. From a value of the same water-cement ratio, concrete mixtures can be made with different slump values. Different slump values require different amounts of water, this is thought to result in higher permeability coefficient values. This research was carried out by making a concrete mixture using the Dreux Gorrise - ITENAS method, for granular factors [G] 0.55, water-cement ratio 0.4, 0.5, and 0.6, and slump plans 30-60 mm and 60-180 mm. The results of this study show a graph of the relationship between the water-cement ratio and slump value with the permeability coefficient value. The results of the graph show a water-cement factor of 0.5 with a slump value of 30-60 mm the value of the permeability coefficient is 5.790 x 10-9 m/sec. While for the water-cement factor 0.5 with a slump value of 60-180 mm the value of the permeability coefficient is 7.674 x 10-9 m/sec. Keywords: permeability of concrete, porosity of concrete, slump value , water-cement ratio

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17

Zhou, Sui Hua, Zhi Yi Chen, and Shi Min Feng. "Improvement Methods of Apparent Permeability of Ferromagnetic Core." Advanced Materials Research 712-715 (June 2013): 1876–80. http://dx.doi.org/10.4028/www.scientific.net/amr.712-715.1876.

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The performance of induction coil magnetic sensors , which usually have large dimensions and heavy weights, is mainly decided by apparent permeability of the core. But flux concentrator is a effective equipment to improve apparent permeability of the core, which will hardly increase dimensions and weights of magnetic sensors. Firstly, mathematical equations of apparent permeability are explained and influencing factors are analysed. Then influencing degrees of different parameters of the flux concentrator are simulated by Maxwell 2D/3D. The results are shown as follows. (a) The larger diameter and thickness of the flux concentrator, the better is the effect of magnetic concentration. (b) The less the gap between core and concentrator, the better is the effect of magnetic concentration. (c) The larger relative permeability of the flux concentrator, the effect of magnetic concentration is unconspicuous for the material whose relative permeabilityis larger than ten thousands.

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18

Shahverdi, Hamidreza, and Mehran Sohrabi. "Modeling of Cyclic Hysteresis of Three-Phase Relative Permeability During Water-Alternating-Gas Injection." SPE Journal 20, no. 01 (June 27, 2014): 35–48. http://dx.doi.org/10.2118/166526-pa.

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Summary Multiphase flow takes place in many petroleum reservoirs—in particular, mature fields and reservoirs under fluid [e.g., gas, water-alternating-gas (WAG)] injection. The numerical simulation of such reservoirs requires knowledge of flow functions (i.e., relative permeability and capillary pressure). Because experimental measurement of fluid permeabilities (in particular) under three-phase-flow conditions is very time-consuming and difficult, many correlations and models were developed and these are widely used instead of measured data. In this study, we have used the results of a comprehensive set of WAG-injection coreflood experiments performed under different wettability conditions and core-permeability values to obtain relative permeabilites of oil, water, and gas under reservoir pressure and temperature. Three-phase relative permeability of each phase was obtained by history matching the measured production and differential pressure obtained in the laboratory. The results of the experiments revealed significant cyclic hysteresis effects in gas and oil relative permeability. We proposed new formulations and methodology for the modeling of cyclic hysteresis of three-phase relative permeability during WAG injection. This technique is a direct method that uses measured three-phase kr data obtained from the first cycle of WAG injection to predict the relative permeability of the subsequent cycles. The integrity of this technique was validated against the three-phase kr data obtained from our WAG experiments. We also assess the validity of the WAG-injection hysteresis model available in reservoir simulators against our three-phase relative permeability data to evaluate its performance.

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19

Widarsono, Bambang. "IMBIBITION WATER-OIL RELATIVE PERMEABILITY: INTRODUCTION OF WETTABILITY STRENGTH FOR ENHANCING MODEL ROBUSTNESS." Scientific Contributions Oil and Gas 42, no. 1 (April 8, 2019): 1–8. http://dx.doi.org/10.29017/scog.42.1.395.

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Water-oil relative permeabilty information of hydrocarbon reservoir rocks plays important roles in various modeling activities related to reservoir modeling and production forecast. The imbibition relative permeability scheme - the process of concern in this study affects many dynamic processes in reservoir. Water flooding and water encroachment form aquifer to oil zone in the reservoir are two two examples which representation in reservoir model requires the data. This study uses the standard Corey relative permeability model as a tool to study and model imbibition relative permeability behaviour of some reservoir rocks in Indonesia. Laboratory data from as many as 340 rock samples - sandstones and limestones - of various permeability and wettability from various oil fi elds in Indonesia is used. Activities in the modeling has pointed out the need to introduce two new empirical factors that relate to rock wettability and non- wetting fl ow hindrance to the model. The two factors appear to have signifi cantly improved the ability of the model to agree and match to the measured data. The modeling also produces suggested values of the factors for rock groups based on rock wettability type and strength, as well as on permeability categories. Comparison between modeling results before and after modifi cation has shown signifi cant improvement in validity of output.

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20

Fanchi, John R. "Directional Permeability." SPE Reservoir Evaluation & Engineering 11, no. 03 (June 1, 2008): 565–68. http://dx.doi.org/10.2118/102343-pa.

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Summary A relationship between permeability tensor and coordinate orientation is used to estimate the error that occurs when some of the terms in the permeability tensor are neglected. The formula for calculating the errors that appear in the magnitude and direction of flow rate are presented. The results are applicable to any reservoir system that is influenced by directional permeability. Introduction Reservoir management experience has demonstrated that anisotropic permeability is needed to correctly solve fluid-flow problems in a variety of realistic settings. Permeability anisotropy in a plane is usually represented using two directions: the direction of maximum permeability, and the direction that is transverse to the direction of maximum permeability. This procedure establishes a natural coordinate system for describing directional permeability. The coordinate system is considered the diagonalized coordinate system. If flow-rate calculations are not aligned with the diagonalized coordinate system, then additional terms should be included in the form of Darcy's law, which is used in flow calculations. All of the permeability terms are considered the elements of the permeability tensor. Most commercial reservoir simulators solve fluid-flow equations that have been formulated on the basis of the assumption that the permeability tensor has been diagonalized (Fanchi 2006b; Ertekin et al. 2001). As a rule, the off-diagonal permeability terms are not included in flow calculations, and an error occurs. Engineers usually assume without justification that the error can be neglected. Research in naturally fractured reservoir modeling (Gupta et al. 2001), geomechanics (Settari et al. 2001), and upscaling (Young 1999) has demonstrated that the full permeability tensor is needed to correctly solve fluid-flow problems in a variety of realistic settings. The purpose of this paper is to show how to assess the magnitude of the error that occurs when the off-diagonal terms are not included in reservoir flow calculations. The directional dependence of permeability and the permeability tensor are introduced in the section titled "Directional Dependence of Permeability." A relationship between the diagonalized-permeability-tensor assumption and coordinate orientation is discussed in the section titled "Permeability Tensor and Coordinate Orientation." This relationship is used in the section titled "Error Analysis" to estimate the error that occurs when some of the terms in the permeability tensor are neglected. We show that the error depends on orientation of the coordinate system, the permeability aspect ratio, and the pressure gradient. The formulas for calculating the errors that appear in the magnitude and direction of the flow rate are presented. Concluding remarks are then presented.

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21

Rauschenberger, Cindy R. "DENTIN PERMEABILITY." Dental Clinics of North America 36, no. 2 (April 1992): 527–42. http://dx.doi.org/10.1016/s0011-8532(22)02511-3.

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22

Blumenthal, David. "Interreligious Permeability." Buddhist-Christian Studies 16 (1996): 45. http://dx.doi.org/10.2307/1390150.

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23

PERSSON, C. G. A., M. ANDERSSON, L. GREIFF, C. SVENSSON, J. S. ERJEFALT, F. SUNDLER, P. WOLLMER, et al. "Airway permeability." Clinical Experimental Allergy 25, no. 9 (September 1995): 807–14. http://dx.doi.org/10.1111/j.1365-2222.1995.tb00022.x.

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24

Lifschitz, Carlos. "Intestinal Permeability." Journal of Pediatric Gastroenterology and Nutrition 4, no. 4 (August 1985): 520–22. http://dx.doi.org/10.1097/00005176-198508000-00003.

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25

Meddings, Jon B., John L. Wallace, and Lloyd R. Sutherland. "SUCROSE PERMEABILITY." American Journal of Therapeutics 2, no. 11 (November 1995): 843–49. http://dx.doi.org/10.1097/00045391-199511000-00004.

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26

Fisher, Andrew T. "Crustal Permeability." Groundwater 55, no. 5 (August 8, 2017): 699–700. http://dx.doi.org/10.1111/gwat.12567.

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27

Bjarnason, I. "Intestinal permeability." Gut 35, no. 1 Suppl (January 1, 1994): S18—S22. http://dx.doi.org/10.1136/gut.35.1_suppl.s18.

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28

Gardiner, K. R., R. J. Maxwell, B. J. Rowlands, and G. R. Barclay. "Intestinal permeability." Gut 37, no. 4 (October 1, 1995): 589. http://dx.doi.org/10.1136/gut.37.4.589.

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29

Blocker, Ariel, Jonathon Pines, and Frank Lafont. "Membrane permeability." Current Opinion in Cell Biology 12, no. 4 (August 2000): 397–98. http://dx.doi.org/10.1016/s0955-0674(00)00106-x.

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30

von Heijne, Gunnar. "Membrane permeability." Current Opinion in Cell Biology 12, no. 4 (August 2000): 399. http://dx.doi.org/10.1016/s0955-0674(00)00107-1.

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31

Pines, Jonathon, and Frank Lafont. "Membrane permeability." Current Opinion in Cell Biology 13, no. 4 (August 2001): 385–86. http://dx.doi.org/10.1016/s0955-0674(00)00224-6.

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32

Pattus, Franc. "Membrane permeability." Current Opinion in Cell Biology 13, no. 4 (August 2001): 387–88. http://dx.doi.org/10.1016/s0955-0674(00)00225-8.

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Jan, Lily Yeh, and Yuh Nung Jan. "Membrane permeability." Current Opinion in Cell Biology 8, no. 4 (August 1996): 449–51. http://dx.doi.org/10.1016/s0955-0674(96)80019-6.

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34

Struthers, G. R., D. J. Andrews, R. J. C. Gilson, G. A. Reynolds, T. Low-Beer, Norman Veall, A. J. Williams, and S. E. Church. "INTESTINAL PERMEABILITY." Lancet 325, no. 8428 (March 1985): 587–88. http://dx.doi.org/10.1016/s0140-6736(85)91251-6.

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35

Stein, W. D. "Membrane permeability." Current Opinion in Cell Biology 2, no. 4 (August 1990): 687–88. http://dx.doi.org/10.1016/0955-0674(90)90111-q.

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36

Al-Awqati, Qais. "Membrane permeability." Current Opinion in Cell Biology 7, no. 4 (January 1995): 463–64. http://dx.doi.org/10.1016/0955-0674(95)80001-8.

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37

Ingebritsen, Steve, and Tom Gleeson. "Crustal permeability." Hydrogeology Journal 25, no. 8 (September 2, 2017): 2221–24. http://dx.doi.org/10.1007/s10040-017-1663-4.

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38

Popescu, Mihail E. "Crustal Permeability." Episodes 41, no. 1 (March 1, 2018): 75. http://dx.doi.org/10.18814/epiiugs/2018/v41i1/008.

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39

Kik, Rémon, Jeroen P. Van den Bos, Jonas Maertens, Henk Jan Verhagen, and Jentsje W. Van der Meer. "NOTIONAL PERMEABILITY." Coastal Engineering Proceedings 1, no. 33 (December 28, 2012): 84. http://dx.doi.org/10.9753/icce.v33.structures.84.

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Different layer design of a rock slope and under layers has a large effect on the strengths on the rock slope itself. In the stability formula developed of VAN DER MEER [1988] this effect is represented by the term Notional Permeability with symbol P. A more open, or permeable, structure underneath the armour layer has the ability to dissipate more wave energy and therefore requires less weight of the armour layer. The influence of this parameter is thus very important in economic sense. Up until now only three configurations have been tested. In practice often intermediate structures were designed which do not correspond to the standard situations. P-values then have to be estimated in comparison with the known structures, which gives some uncertainty around the P-value. Therefore there is the demand for more validated values of the notional permeability representing other structures. During this study physical scale modelling is used to produce a value of P for a new structure.

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40

Cobden, I. "Intestinal permeability." Gut 29, no. 5 (May 1, 1988): 693. http://dx.doi.org/10.1136/gut.29.5.693.

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41

Perdue, M. "Intestinal permeability." Gut 29, no. 7 (July 1, 1988): 1016. http://dx.doi.org/10.1136/gut.29.7.1016.

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42

Simpson, L. O., and B. O. Shand. "Glomerular permeability." Clinical Science 71, no. 2 (August 1, 1986): 221–22. http://dx.doi.org/10.1042/cs0710221.

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43

Huglin, M. B. "Polymer permeability." Polymer 28, no. 1 (January 1987): 170. http://dx.doi.org/10.1016/0032-3861(87)90333-8.

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44

Baker, Richard W. "Polymer permeability." Journal of Controlled Release 5, no. 2 (September 1987): 197. http://dx.doi.org/10.1016/0168-3659(87)90012-5.

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45

Robinson, P. J. "Polymer permeability." Polymer Photochemistry 7, no. 3 (January 1986): 237–38. http://dx.doi.org/10.1016/0144-2880(86)90030-8.

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46

Lifschitz, Carlos. "Intestinal Permeability." Journal of Pediatric Gastroenterology and Nutrition 4, no. 4 (August 1985): 520–22. http://dx.doi.org/10.1002/j.1536-4801.1985.tb08900.x.

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47

Anggraeni, Septi, and Harry Hardiman. "UPSCALING PERMEABILITY." Scientific Contributions Oil and Gas 25, no. 2 (March 31, 2022): 8–14. http://dx.doi.org/10.29017/scog.25.2.1065.

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In reservoir simulation, the engineer needs a set of permeability values estimated on grid block which are as representative as possible of the true value. However. the sample data is limited to small scale measurement relative to the scale of reservoir simulation. Therefore. we need to upscale the permeability data measurement by averaging permeability on volumes. Prior to obtain the appropriate averaging method, an upscaling experiment was performed. The averaging method at the plug scale can be specified from the probe data and the Hassler cube data, by comparison.

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48

Qi, Peng, Jing Zhang, Zhi Rong Mei, and Yue Xiu Wu. "Laboratory Study of Permeability in Low Permeability Medium." Advanced Materials Research 450-451 (January 2012): 1249–52. http://dx.doi.org/10.4028/scientific5/amr.450-451.1249.

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49

Denney, Dennis. "Predicting Permeability in Carbonates for Interwell Permeability Mapping." Journal of Petroleum Technology 53, no. 11 (November 1, 2001): 42–43. http://dx.doi.org/10.2118/1101-0042-jpt.

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50

Qi, Peng, Jing Zhang, Zhi Rong Mei, and Yue Xiu Wu. "Laboratory Study of Permeability in Low Permeability Medium." Advanced Materials Research 450-451 (January 2012): 1249–52. http://dx.doi.org/10.4028/www.scientific.net/amr.450-451.1249.

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Based on the developed low permeability test instrument, gas transport properties of typical Jin-Ping marbles are studied under steady flow of nitrogen. A low permeability test instrument and its tri-axial cell structure were introduced in detail, and this test instrument was used to study transport properties of dense rocks under different temperatures and stress conditions, the Test results showed that intrinsic permeability of Jin-Ping marble is about 10－20 m2. Comparisons are made between test results and an exact method which considers Klinkenberg effect in gas flow equation. Fitting results using the exact method show better agreement with laboratory testing results and the transport parameters gained are more convincible.

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