Optimal Microsatellite Cluster Design for Space-Based Tracking Missions

2007 ◽  
Author(s):  
John Griffith ◽  
Leena Singh ◽  
Jonathan How
Keyword(s):  
Microsatellite Cluster ◽  
Cluster Design

Consideration of Cluster Design Approach for High Power Hall Propulsion

2003 ◽  
Author(s):  
Leonid Zakharenkov ◽  
Alexander Semenkin ◽  
Sergey Tverdokhlebov ◽  
Georgii Karabadzhak ◽  
Vladimir Baranov
Keyword(s):  
High Power ◽  
Design Approach ◽  
Cluster Design

scholarly journals The network architecture optimization based on the server load balancing technology

2021 ◽  
Vol 336 ◽  
pp. 08001
Author(s):  
Ruicai Huo ◽  
Songqiu Liu ◽  
Shiwei He
Keyword(s):  
Load Balancing ◽  
Resource Utilization ◽  
Network Architecture ◽  
Integration Method ◽  
Single Point ◽  
Gateway System ◽  
Architecture Optimization ◽  
Cluster Design

The paper takes the authentication gateway system for internal office network as the research object, for the performance bottleneck and single point of failure problem of the single authentication gateway deployed in the existing primary and standby modes, chooses an authentication gateway integration method based on CA certificate. The practical results show that: through implementing the authentication gateway cluster design and introducing load balancing mechanism, this method solves the performance, stability and single point of failure of the authentication gateway, and improves the resource utilization of the authentication gateway device. This method introduced in this paper can be used for reference for the network architecture optimization based on the server load balancing technology.

scholarly journals A Naval Analysis of Microstrip Antenna Array using Various Elements for ISM-Band

2020 ◽  
Vol 8 (6) ◽  
pp. 5064-5068
Keyword(s):  
Microstrip Antenna ◽  
Data Transfer ◽  
High Increase ◽  
Ism Band ◽  
Microstrip Patch ◽  
Ansoft Hfss ◽  
Low Profile ◽  
Microstrip Antenna Array ◽  
Application Fields ◽  
Cluster Design

Right now, point is to contrast single fix receiving patch and 1x2 exhibit and 1 x4 radio patch on FR4. The emphasis will be on upgrading the elements of fix reception apparatus additionally kept up a high increase in the ISM band (2.3 GHz to 2.6 GHz) at focus recurrence 2.45 GHz. Various parameters of reception apparatus like VSWR, return loss, increase gain and radiation design are reproduced utilizing Ansoft HFSS programming v13. Microstrip patch radio wire in remote correspondence is picking up significance as a most impressive mechanical pattern. Its enormous potential guarantees huge change in close to term eventual fate of remote application fields. The current innovative pattern has concentrated on microstrip patch radio wire. Single microstrip patch reception apparatus has a few favorable circumstances (ease, lightweight, conformal and low profile), however, it has little detriments too-like low addition, low productivity, low directivity, and thin data transfer capacity. These weaknesses can be overwhelmed by the execution of many fix reception apparatuses in a cluster design. Here term exhibit represents geometrical and electrical courses of action of fix components. As we increment the number of patch components to frame a cluster, improvement in execution is watched. Right now, for 1x1, 1x2, 1x4 clusters have been investigated and thought about. It has been inferred that the 1x4 patch cluster shows a preferable outcome over a single patch.

Advancements in Step Down Tests to Guide Perforation Cluster Design and Limited Entry Pressure Intensities - Learnings from Field Tests in Multiple Basins

2021 ◽  
Author(s):  
Somnath Mondal ◽  
Min Zhang ◽  
Paul Huckabee ◽  
Gustavo Ugueto ◽  
Raymond Jones ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Hydraulic Fracturing ◽  
Hydraulic Fracture ◽  
Fracture Propagation ◽  
Field Tests ◽  
Pressure Drops ◽  
Wellbore Pressure ◽  
Hydraulic Fracture Propagation ◽  
Step Down ◽  
Cluster Design

Abstract This paper presents advancements in step-down-test (SDT) interpretation to better design perforation clusters. The methods provided here allow us to better estimate the pressure drop in perforations and near-wellbore tortuosity in hydraulic fracturing treatments. Data is presented from field tests from fracturing stages with different completion architectures across multiple basins including Permian Delaware, Vaca Muerta, Montney, and Utica. The sensitivity of near-wellbore pressure drops and perforation size on stimulation distribution effectiveness in plug-and-perf (PnP) treatments is modeled using a coupled hydraulic fracturing simulator. This advanced analysis of SDT data enables us to improve stimulation distribution effectiveness in multi-cluster or multiple entry completions. This analysis goes much further than the methodology presented in URTeC2019-1141 and additional examples are presented to illustrate its advantages. In a typical SDT, the injection flowrate is reduced in four or five abrupt decrements or "steps", each with a duration long enough for the rate and pressure to stabilize. The pressure-rate response is used to estimate the magnitude of perforation efficiency and near-wellbore tortuosity. In this paper, two SDTs with clean fluids were conducted in each stage - one before and another after proppant slurry was injected. SDTs were conducted in cemented single-point entry (cSPE) sleeves, which present a unique opportunity to measure only near-wellbore tortuosity using bottom-hole pressure gauge at sleeve depth, negligible perforation pressure drops, and less uncertainty in interpretation. SDTs were conducted in PnP stages in multiple unconventional basins. The results from one set of PnP stages with optic fiber distributed sensing were modeled with a hydraulic fracturing simulator that combines wellbore proppant transport, perforation size growth, near-wellbore pressure drop, and hydraulic fracture propagation. Past SDT analysis assumed that the pressure drop due to near-wellbore tortuosity is proportional to the flow rate raised to an exponent, β = 0.5, which typically overestimates perforation friction from SDTs. Theoretical derivations show that β is related to the geometry and flow type in the near-wellbore region. Results show that initial β (before proppant slurry) is typically around 0.5, but the final value of β (after proppant slurry) is approximately 1, likely due to the erosion of near-wellbore tortuosity by the proppant slurry. The new methodology incorporates the increase in β due proppant slurry erosion. Hydraulic fracturing modeling, calibrated with optic fiber data, demonstrates that the stimulation distribution effectiveness must consider the interdependence of proppant segregation in the wellbore, perforation erosion, and near-wellbore tortuosity. An improved methodology is presented to quantify the magnitude of perforation and near-wellbore tortuosity related pressure drops before and after pumping of proppant slurry in typical PnP hydraulic fracture stimulations. The workflow presented here shows how the uncertainties in the magnitude of near-wellbore complexity and perforation size, along with uncertainties in hydraulic fracture propagation parameters, can be incorporated in perforation cluster design.

A cluster design controlled trial of arts-based observational skills training in primary care

2007 ◽  
Vol 41 (4) ◽  
pp. 395-401 ◽  
Author(s):  
Deborah Kirklin ◽  
Jane Duncan ◽  
Sandy McBride ◽  
Sam Hunt ◽  
Mark Griffin
Keyword(s):  
Primary Care ◽  
Controlled Trial ◽  
Skills Training ◽  
Observational Skills ◽  
Cluster Design

scholarly journals A Cluster Design on the Influence of Energy Taxation in Shaping the New EU-28 Economic Paradigm

Energies ◽  
2017 ◽  
Vol 10 (2) ◽  
pp. 257 ◽  
Author(s):  
Marian Zaharia ◽  
Aurelia Pătrașcu ◽  
Manuela Gogonea ◽  
Ana Tănăsescu ◽  
Constanța Popescu
Keyword(s):  
Economic Paradigm ◽  
Energy Taxation ◽  
Cluster Design
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