Modification of the Stratification and Velocity Profile Within the Straits and Seas of the Indonesian Archipelago

2012 ◽  
Author(s):  
Arnold L. Gordon
Keyword(s):  
Velocity Profile ◽  
Indonesian Archipelago

Investigation of the influence of the flow structure on the accuracy of flow measurement before a hydrometric structure in an open channel

2020 ◽  
pp. 41-44
Author(s):  
Anatoly Kusher
Keyword(s):  
Velocity Profile ◽  
Flow Velocity ◽  
Water Flow ◽  
Flow Measurement ◽  
Water Discharge ◽  
Critical Depth ◽  
Flow Measurements ◽  
Study Results ◽  
Flow Velocity Profile ◽  
Upstream Flow

The reliability of water flow measurement in irrigational canals depends on the measurement method and design features of the flow-measuring structure and the upstream flow velocity profile. The flow velocity profile is a function of the channel geometry and wall roughness. The article presents the study results of the influence of the upstream flow velocity profile on the discharge measurement accuracy. For this, the physical and numerical modeling of two structures was carried out: a critical depth flume and a hydrometric overfall in a rectangular channel. According to the data of numerical simulation of the critical depth flume with a uniform and parabolic (1/7) velocity profile in the upstream channel, the values of water discharge differ very little from the experimental values in the laboratory model with a similar geometry (δ < 2 %). In contrast to the critical depth flume, a change in the velocity profile only due to an increase in the height of the bottom roughness by 3 mm causes a decrease of the overfall discharge coefficient by 4…5 %. According to the results of the numerical and physical modeling, it was found that an increase of backwater by hydrometric structure reduces the influence of the upstream flow velocity profile and increases the reliability of water flow measurements.

Katalogisasi Naskah Sunda Kuno Koleksi Kabuyutan Ciburuy

Metahumaniora ◽  
2017 ◽  
Vol 7 (3) ◽  
pp. 392
Author(s):  
Mamat Ruhimat
Keyword(s):  
Intellectual Property ◽  
West Java ◽  
The Past ◽  
Indonesian Archipelago ◽  
Historical Heritage

ABSTRAKTradisi tulis merupakan bukti kemajuan peradaban suatu bangsa. Naskah-naskahSunda Kuno yang ada saat ini merupakan peninggalan sejarah perjalanan bahasa dan budayaNusantara. Penelitian terhadap naskah-naskah Sunda Kuno tidak begitu banyak karenajumlah penelitinya sedikit. Bahkan katalog yang khusus mencatat naskah Sunda Kuno dimasyarakat pun belum ada. Katalogisasi Naskah Sunda Kuno di Jawa Barat merupakanupaya menginventarisasi dan mendokumentasi naskah-naskah Sunda Kuno di masyarakat.Katalogisasi juga merupakan direktori penelitian yang dilakukan terhadap naskah SundaKuno sehingga menjadi pembuka jalan bagi para peneliti yang ingin menggali kekayaanintelektual masa lalu. Katalogisasi naskah Sunda Kuno dimulai dari koleksi KabuyutanCiburuy di Kabupaten Garut. Kabuyutan ini menyimpan kurang lebih 30 kropak naskahSunda Kuno yang diperkirakan ditulis pada abad XVI-XVIII Masehi. Sebagian besar naskahlontar ini kondisinya rusak parah dan perlu penanganan yang serius. Dari ketiga puluhnaskah tersebut baru 15 naskah yang dapat diidentifikasi dan dibuat deskripsi lengkapnya.Kata kunci: Naskah, Katalog, Bahasa, BudayaABST RACTWritten tradition is evidence of the development of civilization of a nation. OldSundanese manuscripts still existing today is a historical heritage of linguistic and culturaljourneys of the Indonesian Archipelago. Unfortunately, most of the manuscripts are notappropriately preserved and from time to time continue to be damaged. Furthermore,the research on the Old Sundanese manuscripts is not so many due to the limited numberof the researchers. Even a catalogue especially listing Old Sundanese manuscripts in thesociety has not been made yet. The existing catalogues have only listed the manuscriptskept by the official institutions such as libraries and museums. Cataloging the OldSundanese manuscripts in West Java is one of the efforts to inventory and document theOld Sundanese manuscripts that are still scattered in the society, both stored in customaryinstitutions and personal collections. Cataloging is also a research directory that has everbeen conducted on Old Sundanese manuscripts, so it can be a pioneer for researchers whowant to explore the intellectual property in the past. As the first stage, cataloging theOld Sundanese manuscripts is started from the collection of Kabuyutan Ciburuy in GarutRegency. Kabuyutan stores approximately 30 compartments (kropak) of Old Sundanesemanuscripts that are estimated to have been written in the 16 to 18 century AD. Most ofthese manuscripts are badly damaged and need to be seriously taken care of. From thethirty manuscripts, only 15 manuscripts can be identified and can be completely described.Keywords: manuscript, catalogue, language, culture

BARK-CLOTH AND BARK-CLOTH BEATER FROM THE INDONESIAN ARCHIPELAGO

2016 ◽  
Vol 5 (1) ◽  
pp. 15
Author(s):  
Sunarningsih Sunarningsih
Keyword(s):  
Indonesian Archipelago

Theoretical Principles of Streaming Current Detection

1989 ◽  
Vol 21 (6-7) ◽  
pp. 443-453 ◽  
Author(s):  
S. K. Dentel ◽  
K. M. Kingery
Keyword(s):  
Velocity Profile ◽  
Electrophoretic Mobility ◽  
Double Layer ◽  
Initial Attempt ◽  
Streaming Current ◽  
Coagulant Dosage ◽  
Model Predictions ◽  
Double Layer Model ◽  
Simplifying Assumptions ◽  
Current Detection

In spite of the increased use of streaming current detectors (SCDs) as a means of monitoring and/or controlling coagulant dosage, knowledge regarding fundamental workings is incomplete. This paper provides an initial attempt at predicting and verifying functioning compared to electrophoretic mobility. The instrument's components -- the sensor and the signal processor -- are first described. Equations modelling electro-double layer behavior in its sensor are then developed. Simplifying assumptions include the use of a capacitance model of the double layer and a triangular velocity profile for fluid within the sensor's annulus. More complex modelling approaches are also suggested which incorporate the Gouy-Chapman electro-double layer model and an exact solution for the velocity profile. Experimental results confirm predictions of the simplified model under conditions of low potential. A monotonic relationship exists between streaming current electrophoretic mobility, which is required for its use as a control parameter. Deviations from model predictions are suggested to be due to charge characteristics of the sensor surfaces themselves.

Ciliary Flow of Casson Nanofluid with the Influence of MHD having Carbon Nanotubes

2020 ◽  
Vol 16 ◽  
Author(s):  
Adel Alblawi ◽  
Saba Keyani ◽  
S. Nadeem ◽  
Alibek Issakhov ◽  
Ibrahim M. Alarifi
Keyword(s):  
Carbon Nanotubes ◽  
Velocity Profile ◽  
Pressure Gradient ◽  
Volume Fraction ◽  
Solid Volume Fraction ◽  
Pressure Rise ◽  
Shear Stresses ◽  
Left Wall ◽  
Coupled Equations ◽  
The Right

Objective: In this paper, we consider a model that describes the ciliary beating in the form of metachronal waves along with the effects of Magnetohydrodynamic fluid over a curved channel with slip effects. This work aims at evaluating the effect of Magnetohydrodynamic (MHD) on the steady two dimensional (2-D) mixed convection flow induced in carbon nanotubes. The work is done for both the single wall nanotube and multiple wall nanotube. The right wall and the left wall possess a metachronal wave that is travelling along the outer boundary of the channel. Methods: The wavelength is considered as very large for cilia induced MHD flow. The governing linear coupled equations are simplified by considering the approximations of long wavelength and small Reynolds number. Exact solutions are obtained for temperature and velocity profile. The analytical expressions for the pressure gradient and wall shear stresses are obtained. Term for pressure rise is obtained by applying Numerical integration method. Results: Numerical results of velocity profile are mentioned in a table form, for various values of solid volume fraction, curvature, Hartmann number [M] and Casson fluid parameter [ζ]. Final section of this paper is devoted to discussing the graphical results of temperature, pressure gradient, pressure rise, shear stresses and stream functions. Conclusion: Velocity profile near the right wall of the channel decreases when we add nanoparticles into our base fluid, whereas an opposite behaviour is depicted near the left wall due to ciliated tips whereas the temperature is an increasing function of B and ߛ and decreasing function of ߶.

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