Relevant bibliographies by topics / Permeability

Academic literature on the topic 'Permeability'

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Published: 4 June 2021
Last updated: 29 July 2024

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Journal articles on the topic "Permeability"

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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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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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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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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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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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Dissertations / Theses on the topic "Permeability"

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Reid, Richard A. "Triaxial permeability device." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/20036.

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Cunningham, Michael (Michael Ian) Carleton University Dissertation Engineering Civil and Environmental. "Relative permeability measurements for two phase flow through low permeability soils." Ottawa, 1994.

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Hudd, Raymond W. "Measurement of concrete permeability." Thesis, Loughborough University, 1989. https://dspace.lboro.ac.uk/2134/6722.

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A comparison was made between a number of laboratory and in-situ concrete permeability test methods. The laboratory tests used measured air, water, and water vapour permeability, whilst the in-situ tests used were the Initial surface absorption test, the Figg air and water tests, and a new in-situ method called the Egg test; a non-destructive surface test which measures air permeability properties. An initial set of tests were carried out on six concrete mixes with water: cement(w/c) ratios between 0.3 and 0.8. These tests showed that problems existed with both the laboratory and in-situ test methods. Some of these problems arose from the preparation of specimens or test procedures and these were overcome with practice or by modifying the test methods. However, it was found that a major problem is moisture in the concrete which decreases it's measured permeability. Further tests were carried out on a second set of concrete specimens with the same mix proportions as the first and a set of mortar specimens with w/c ratios ranging from 0.3 to 1.1 and cement: sand (c: s) ratios from 1: 1 to 1: 5. Results from tests on oven dry specimens were used to compare the different methods and showed that few simple relationships existed between the different methods. Comparing the test results with the mix proportions showed that in the majority of cases, the measured permeability values increased as the w/c ratio increased, but the relationships between the tests results and c: s ratio were more complicated. After these tests had been completed, specimens from twenty six of the mixes were retested after being conditioned to various different moisture contents. The results of these tests showed that in most cases there was a rapid increase in measured permeability as the specimens dried, followed by a slower increase (in some cases a decrease) as the specimens approached an oven dry condition. To complement this study a number of methods were examined for measuring in-situ moisture content. The most promising of these was a non-destructive method which operated by measuring the electrical permittivity of the material it was placed against. Because the electrical permittivity varies with the amount of water in the concrete, it is largely independent of the type material being tested. Results from this test showed a shallow linear drop from saturated to approximately half of the saturated moisture content, followed by a steep drop towards the oven dry condition.
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Taherzadeh, Morteza. "Nifedipine and microvascular permeability." Thesis, King's College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299874.

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Dennison, Patrick Winford. "Epithelial permeability in asthma." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/416625/.

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Our knowledge and understanding of asthma have evolved over time, leading to new and improved treatments for this disease. Despite existing treatments however, there remains to date a significant proportion of asthmatics who remain poorly controlled, with unmet needs. Most existing treatments are based on the Th2-driven inflammation model of asthma, however there is increasing recognition of the importance of the epithelium in asthma pathogenesis. It has been proposed that the asthmatic epithelium is chronically damaged and unable to repair, with increased permeability as a result. Existing treatments do not address the epithelial damage directly, however there are now available recombinant growth factors that have been shown to have beneficial effects on epithelial healing. Our hypothesis was that modification of the epithelium, in effect boosting its repair using recombinant human keratinocyte growth factor (rhKGF), would lead to improvement in clinical parameters. This was explored in several fashions. Firstly a randomised, double-blind, placebo-controlled clinical trial was performed using 20 poorly controlled, moderate asthmatics, with the active treatment group receiving parenteral rhKGF. Assessments before and after drug administration included objective, clinically relevant, measures of asthma such as airway hyperresponsiveness (AHR) measurements, spirometric measures, exhaled nitric oxide measurements and peak flow recording. Subjective, patient-centred assessments were also made using questionnaires to assess asthma control and quality of life, and bronchoscopy was performed to obtain samples to measure biological effects of the drug. KGF treatment resulted in a significantly greater improvement in the primary outcome of mannitol AHR, together with greater improvements in quality of life in the active treatment group compared to placebo. Other features (such as methacholine AHR, asthma control questionnaire scores, spirometric values, exhaled nitric oxide and peak flow variability) did not differ significantly between the groups, although this may be due to a greater than expected placebo response. Biological outcomes also did not differ significantly between the groups, although this may have been due to the sampling time-point used. Concurrently to the clinical trial above, in vitro experiments were performed on cell cultures of epithelial cells from asthmatic and healthy donors, to verify and further explore the effects of KGF on an asthmatic epithelium. Specifically mechanical wounds were inflicted on the cultures, with assessment of the repair process using wound imaging, measurement of trans-epithelial electrical resistance (TER) and permeability to FITC-labelled dextran, in the presence and absence of KGF. As a subset of these experiments, some cultures were exposed to mechanical compression using air pressure, as a mimic for bronchoconstriction, to see if KGF was effective in these circumstances. Results confirm a biological effect for KGF on wound repair in the asthmatic epithelium, which can also partially overcome the deleterious effect of compression on wound healing. An intrinsic difference in wound healing between asthmatic and healthy cohorts, as previously reported, was not apparent. Lastly the potential of nuclear medicine imaging, to assess epithelial permeability, was explored, for its potential use in future studies of asthma treatments addressing the epithelium directly. Unfortunately this was halted after a pilot study suggested potential methodological flaws – the results and conclusions from this pilot study are presented here, with suggestions for future studies in this area.
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Daly, Philip J. "Permeability of pseudomonas aeruginosa." Thesis, Aston University, 1986. http://publications.aston.ac.uk/12458/.

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Wong, Wing-yee. "Permeability studies in rock fractures." View the Table of Contents & Abstract, 2002. http://sunzi.lib.hku.hk/hkuto/record/B30109334.

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Khajeh, Ehsan. "Permeability of hypoeutectic aluminum alloys." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36586.

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The interdendritic permeability is a critical parameter that defines the feedability of the mushy zone during solidification. In this study, a theoretical expression to describe the evolution of permeability throughout the complete solidification range (from dendritic to dendritic/eutectic) of hypoeutectic aluminum alloys has been derived, verified and validated through physical and numerical modeling. The permeability of the primary, equiaxed, dendritic phase has been characterized using geometries obtained by X-ray microtomographic analysis of Al-4.5wt%Cu alloy samples quenched at different temperatures after the start of solidification. The permeability during equiaxed eutectic solidification was characterized on simulated dendritic/eutectic microstructures predicted using a Cellular Automaton technique. For both the dendritic and dendritic/eutectic structures, the permeability was characterized i) physically using large-scale analogues of the characterized microstructures and ii) numerically by predicting the flow through the simulated microstructures. The microstructural parameters were then linked to more practical parameters available in solidification models through i) developing an inverse analysis technique to characterize eutectic solidification and ii) development of a geometric model for dendritic solidification. The permeability values determined through physical and numerical modeling are in good agreement with each other and are consistent with the mathematical expression. The proposed permeability expression is valid over the complete solidification range and for a wide range of compositions. The expression reduces to the conventional Carman-Kozeny expression during dendritic solidification and/or dendritic/eutectic solidification with low density of eutectic grains. However, it deviates from the conventional Carman-Kozeny expression as the density of eutectic grains increases.
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Weaver, Laurence Trevelyan. "The intestinal permeability of infants." Thesis, University of Cambridge, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289788.

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Mirza, Nabeel Aman. "Geophysical modelling of sediment permeability." Thesis, Bangor University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280908.

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Books on the topic "Permeability"

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Turksen, Kursad, ed. Permeability Barrier. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-1673-4.

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Comyn, J., ed. Polymer Permeability. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4858-7.

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Gleeson, Tom, and Steven E. Ingebritse, eds. Crustal Permeability. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781119166573.

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Turksen, Kursad, ed. Permeability Barrier. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-191-8.

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J, Comyn, ed. Polymer permeability. London: Elsevier Applied Science Publishers, 1985.

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Comyn, J. Polymer Permeability. Dordrecht: Springer Netherlands, 1985.

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D, Whiting, Walitt A. L. 1937-, and American Concrete Institute, eds. Permeability of concrete. Detroit: American Concrete Institute, 1988.

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Banfalvi, Gaspar. Permeability of Biological Membranes. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-28098-1.

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Daly, Philip John. Permeability of pseudomonas aeruginosa. Birmingham: Aston University. Department of Pharmaceutical Sciences, 1986.

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Nasseri, Kioomars. Permeability issues in pharmacokinetics. Manchester: University of Manchester, 1996.

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Book chapters on the topic "Permeability"

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Verruijt, Arnold. "Permeability." In An Introduction to Soil Mechanics, 59–65. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61185-3_7.

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de Mello Innocentini, Murilo Daniel, Pilar Sepulveda, and Fernando dos Santos Ortega. "Permeability." In Cellular Ceramics, 313–41. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527606696.ch4b.

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Deamer, David. "Permeability." In Encyclopedia of Astrobiology, 1221–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_124.

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Deamer, David. "Permeability." In Encyclopedia of Astrobiology, 1847–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_124.

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Brown, R. P. "Permeability." In Physical Testing of Rubber, 287–98. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-011-0529-3_17.

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Gooch, Jan W. "Permeability." In Encyclopedic Dictionary of Polymers, 527. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8589.

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Ganat, Tarek Al-Arbi Omar. "Permeability." In Fundamentals of Reservoir Rock Properties, 25–54. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-28140-3_3.

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Brown, Roger. "Permeability." In Physical Test Methods for Elastomers, 253–64. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-66727-0_18.

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Lin, Haiqing. "Permeability." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_1829-1.

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Weik, Martin H. "permeability." In Computer Science and Communications Dictionary, 1250. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_13844.

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Conference papers on the topic "Permeability"

1

"Laboratory Permeability Measurement." In SP-108: Permeability of Concrete. American Concrete Institute, 1988. http://dx.doi.org/10.14359/3633.

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Kiburz, D. E., and S. C. Sullivan. "A Methodology to Optimize Fracturing Treatments in a Tight Gas Field of Northwest Louisiana." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29554-ms.

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King, Gregory R., and Ertekin Turgay. "State-of-the-Art Modeling for Unconventional Gas Recovery, Part II:Recent Developments." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29575-ms.

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Olson, Jon E. "Fracturing from Highly Deviated and Horizontal Wells: Numerical Analysis of Non-planar Fracture Propagation." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29573-ms.

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Stadulis, Jerome M. "Development of a Completion Design to Control Screenouts Caused by Multiple Near-Wellbore Fractures." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29549-ms.

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Harkrider, J. D., W. W. Aud, C. L. Cipolla, and J. T. Hansen. "The Evolution of an Applied Hydraulic Fracture Project, Frontier Formation Moxa Arch, Wyoming." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29550-ms.

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Ely, John W., Ted D. Brown, and Shawn D. Reed. "Optimization Of Hydraulic Fracture Treatments In The Williams Fork Formation Of The Mesaverde Group." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29551-ms.

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Eberhard, M. J., and D. E. Schlosser. "Current Use of Limited-Entry Hydraulic Fracturing in the Codell/Niobrara Formations-DJ Basin." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29553-ms.

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Lehman, Lyle V., Robert Olson, and Charles C. Kelley. "Stimulation Fluid Development and Applied Fracturing Model Improves Results, Morrow Sandstone, Hutchison County, Texas." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29555-ms.

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Horne, John C., and John R. Forster. "Depositional, Diagenetic, And Tectonic Controls On Frontier Formation Reservoir Characteristics: Moxa Arch, Southwestern Wyoming." In Low Permeability Reservoirs Symposium. Society of Petroleum Engineers, 1995. http://dx.doi.org/10.2118/29556-ms.

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Reports on the topic "Permeability"

1

Buchenauer, Dean A., and Richard A. Karnesky. Stainless Steel Permeability. Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1221706.

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Katsube, T. J., and S. Connell. Shale permeability characteristics. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1998. http://dx.doi.org/10.4095/209964.

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Diomampo, Gracel, P. Relative permeability through fractures. US: Stanford University, Stanford, CA, August 2001. http://dx.doi.org/10.2172/896520.

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Mark D. Habana. Relative Permeability of Fractured Rock. Office of Scientific and Technical Information (OSTI), June 2002. http://dx.doi.org/10.2172/801752.

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Beall, Joe, and Mark Walters. Geothermal Permeability Enhancement - Final Report. Office of Scientific and Technical Information (OSTI), June 2009. http://dx.doi.org/10.2172/958100.

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Marley, M. C. Air sparging in low permeability soils. Office of Scientific and Technical Information (OSTI), August 1996. http://dx.doi.org/10.2172/447167.

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Schuring, J. R. Pneumatic fracturing of low permeability media. Office of Scientific and Technical Information (OSTI), August 1996. http://dx.doi.org/10.2172/447171.

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Anderl, R. A., and P. K. Nagata. Helium permeability through austenitic stainless steel. Office of Scientific and Technical Information (OSTI), September 1989. http://dx.doi.org/10.2172/7171431.

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John W. Pritchett. Evaluating Permeability Enchancement Using Electrical Techniques. Office of Scientific and Technical Information (OSTI), September 2008. http://dx.doi.org/10.2172/1013695.

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Morris, J. P., I. N. Lomov, and L. A. Glenn. Simulating perforation permeability damage and cleanup. Office of Scientific and Technical Information (OSTI), December 2000. http://dx.doi.org/10.2172/15006161.

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