scholarly journals The rapid development of small scale cyclones — numerical modelling versus empirical models

2016 ◽  
Vol 40 (11-12) ◽  
pp. 6082-6104 ◽  
Author(s):  
C.W. Haig ◽  
A. Hursthouse ◽  
D. Sykes ◽  
S. Mcilwain
Keyword(s):  
Numerical Modelling ◽  
Rapid Development ◽  
Empirical Models ◽  
Small Scale

scholarly journals Urban Building Change Detection in SAR Images Using Combined Differential Image and Residual U-Net Network

2019 ◽  
Vol 11 (9) ◽  
pp. 1091 ◽  
Author(s):  
Lu Li ◽  
Chao Wang ◽  
Hong Zhang ◽  
Bo Zhang ◽  
Fan Wu
Keyword(s):  
Change Detection ◽  
Rapid Development ◽  
Ratio Method ◽  
Small Scale ◽  
City Management ◽  
Spatiotemporal Resolution ◽  
Sar Images ◽  
Difference Image ◽  
Radar Images ◽  
Log Ratio

With the rapid development of urbanization in China, monitoring urban changes is of great significance to city management, urban planning, and cadastral map updating. Spaceborne synthetic aperture radar (SAR) sensors can capture a large area of radar images quickly with fine spatiotemporal resolution and are not affected by weather conditions, making multi-temporal SAR images suitable for change detection. In this paper, a new urban building change detection method based on an improved difference image and residual U-Net network is proposed. In order to overcome the intensity compression problem of the traditional log-ratio method, the spatial distance and intensity similarity are combined to generate a weighting function to obtain a weighted difference image. By fusing the weighted difference image and the bitemporal original images, the three-channel color difference image is generated for building change detection. Due to the complexity of urban environments and the small scale of building changes, the residual U-Net network is used instead of fixed statistical models and the construction and classifier of the network are modified to distinguish between different building changes. Three scenes of Sentinel-1 interferometric wide swath data are used to validate the proposed method. The experimental results and comparative analysis show that our proposed method is effective for urban building change detection and is superior to the original U-Net and SVM method.

scholarly journals Monthly Electricity Consumption Forecasting Method Based on X12 and STL Decomposition Model in an Integrated Energy System

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Tianhe Sun ◽  
Tieyan Zhang ◽  
Yun Teng ◽  
Zhe Chen ◽  
Jiakun Fang
Keyword(s):  
Power Consumption ◽  
Rapid Development ◽  
Electricity Consumption ◽  
Energy System ◽  
Small Scale ◽  
Power Demand ◽  
Distributed Energy ◽  
Strategic Competition ◽  
Integrated Energy System ◽  
Monthly Electricity Consumption

With the rapid development and wide application of distributed generation technology and new energy trading methods, the integrated energy system has developed rapidly in Europe in recent years and has become the focus of new strategic competition and cooperation among countries. As a key technology and decision-making approach for operation, optimization, and control of integrated energy systems, power consumption prediction faces new challenges. The user-side power demand and load characteristics change due to the influence of distributed energy. At the same time, in the open retail market of electricity sales, the forecast of electricity consumption faces the power demand of small-scale users, which is more easily disturbed by random factors than by a traditional load forecast. Therefore, this study proposes a model based on X12 and Seasonal and Trend decomposition using Loess (STL) decomposition of monthly electricity consumption forecasting methods. The first use of the STL model according to the properties of electricity each month is its power consumption time series decomposition individuation. It influences the factorization of monthly electricity consumption into season, trend, and random components. Then, the change in the characteristics of the three components over time is considered. Finally, the appropriate model is selected to predict the components in the reconfiguration of the monthly electricity consumption forecast. A forecasting program is developed based on R language and MATLAB, and a case study is conducted on the power consumption data of a university campus containing distributed energy. Results show that the proposed method is reasonable and effective.

Multiscale 3D stress field modelling for the URL 'Reiche Zeche' using a discontinuum model approach

2020 ◽  
Author(s):  
Sebastian Rehde ◽  
Prof. Dr.-Ing. habil. Heinz Konietzky
Keyword(s):  
Numerical Model ◽  
Stress Field ◽  
Numerical Modelling ◽  
Large Scale ◽  
Small Scale ◽  
Hydraulic Stimulation ◽  
Field Modelling ◽  
Slip Tendency ◽  
Project Site ◽  
Model Approach

<p>Underneath the small town of Freiberg, Saxony, stretches the ore mine complex 'Reiche Zeche'. The underground laboratory (URL) inside the mine was inaugurated in 1919 and is an internationally acknowledged institution for experimental work of variable scales and subjects. Our work is part of the Stimtec project, which aims on improving planning and conducting hydraulic stimulation in anisotropic, crystalline rocks. The project comprises numerical modelling and field work inside the URL. Prior to the numerical analysis, we implemented a tool to perform a slip tendency analysis of faults that were mapped along the tunnel walls at the project site. It allows to assess the slip tendency of arbitrarily oriented faults and stress fields. The tool is used for preselection of stimulation intervals, enabling identification of faults which are likely to be reactivated by hydraulic stimulation. <br>We perform the stress field modelling using a multiscale numerical model approach. Therefore, we set up three different sized models deriving from a large scale 3D geomodel. The geomodel contains the topography, drifts and 47 fault structures taken from mine maps. The project site and measurement points are positioned in the center of the model. From the large scale geomodel, we developed a simplified numerical model geometry with 12 major faults, disregarding the galleries. We use the distinct element code 3DEC for discontinuous numerical modelling of the stress field. This allows to take into account discrete displacements along the faults. Far field stress is taken from previous investigations and literature as boundary and initial conditions. The resulting stress  field provides the stress tensors for calculating the corresponding forces for each gridpoint at the model boundaries of the small scale model. The small scale numerical model is smaller by a factor of 10, including two major fault segments, the galleries and mapped local faults. Hydraulic fracturing stress measurements taken during the field tests indicate that the stress field is strongly distorted in the vicinity of the tunnels and excavations along the ore veins. Hence, we developed a third model approach, a 2.5D slice model, to investigate the influence of the assumed excavation damage zones.<br>With this work, we provide an approach to predict the stress field inside the complex, anisotropic rock volume. Within the framework of the Stimtec project, we developed a workflow for planning hydraulic stimulation tests and 3D geological models for a diverse set of further appliations in the URL 'Reiche Zeche'.</p>

An interactive bypass transition mechanism in wall-bounded flows

2008 ◽  
Vol 615 ◽  
pp. 345-369 ◽  
Author(s):  
F. SEDAT TARDU ◽  
RABIA NACEREDDINE ◽  
OLIVIER DOCHE
Keyword(s):  
Reynolds Shear Stress ◽  
Rapid Development ◽  
Three Dimensional ◽  
Streamwise Vortex ◽  
Transition Process ◽  
Wall Turbulence ◽  
Small Scale ◽  
Bypass Transition ◽  
Transition Mechanism ◽  
Turbulent Wall

The interaction between two localized disturbances is analysed in a subcritical channel flow through direct numerical simulations. The initial perturbations are in the form of two pairs of counter-rotating vortices. One of them interacts with the wall-normal vorticity layers set up near the wall, by locally compressing or stretching part of them through the straining motion it induces. The breakdown of spanwise symmetry leads to the rapid development of a new wall-normal vorticity patch that is tilted by the shear and rolls up into a new small-scale streamwise vortex. The process results in a localized turbulent spot at later stages of development. A detailed analysis is carried out to determine the role of different parameters entering the physics of the mechanism. Several critical thresholds that trigger the interactive bypass transition process are found and analysed. The similarity parameters resulting from the parametric investigation coincide well with those governing the self-sustaining Reynolds-shear-stress-producing eddies in the buffer layer of a fully developed turbulent wall flow. It is suggested that the mechanism we propose may play a role in the regeneration cycle of the near-wall turbulence-generating structures by bypassing the three-dimensional streak instability mechanism.

scholarly journals A Flexible and Stretchable Self-Powered Nanogenerator in Basketball Passing Technology Monitoring

Electronics ◽  
2021 ◽  
Vol 10 (21) ◽  
pp. 2584
Author(s):  
Changjun Jia ◽  
Yongsheng Zhu ◽  
Fengxin Sun ◽  
Tianming Zhao ◽  
Rongda Xing ◽  
...  
Keyword(s):  
Real Time ◽  
Inorganic Salt ◽  
Rapid Development ◽  
Human Motion ◽  
Small Scale ◽  
New Approach ◽  
Motion Data ◽  
Fifth Generation ◽  
Self Powered ◽  
Generation Technology

The rapid development of the fifth generation technology poses more challenges in the human motion inspection field. In this study, a nanogenerator, made by PVDF, ionic hydrogel, and PDMS, is used. Furthermore, a transparent, stretchable, and biocompatible PENG (TSB-PENG) is presented, which can be used as a self-powered sensor attached to the athlete’s joints, which helps to monitor the training and improve the subject’s performance. This device shows the ability to maintain a relatively stable output, under various external environments (e.g., inorganic salt, organic matter and temperature). Additionally, TSB-PENG can supply power to small-scale electronic equipment, such as Bluetooth transmitting motion data in real time. This study can provide a new approach to designing lossless, real-time, portable, and durable self-powered sensors in the sports motoring field.

scholarly journals THE ROLE OF ITGC IN SUPPORTING FINANCIAL AUDIT

2020 ◽  
Vol 1 (2) ◽  
pp. 75-81
Author(s):  
Adrian Adrian ◽  
Sakthy Yudha Santri
Keyword(s):  
Information Technology ◽  
Rapid Development ◽  
Small Scale ◽  
General Control ◽  
External Auditors ◽  
Financial Audit ◽  
External Auditor

ITGC (Information Technology General Control) is generally known as part of the Financial Audit conducted by the External Auditor. Very diverse software from small scale to enterprise class is needed for many companies due to the rapid development of the business. For the external auditors themselves, one of the jobs performed is to conduct regular financial audits in accordance with the needs of their clients. The regulators themselves both OJK and BI as well as other fields in accordance with their business such as BAPEPAM, have also required several regulations that must be considered by each company that uses information technology in supporting its business

scholarly journals Analisis Rantai Pemasaran Ikan di Tempat Pelelangan Ikan (TPI) Karangantu Serang, Banten

2018 ◽  
Vol 4 (1) ◽  
pp. 58-64
Author(s):  
Muhammad Reza Rozaqi ◽  
Ediyanto
Keyword(s):  
Research Method ◽  
Rapid Development ◽  
Descriptive Analysis ◽  
Secondary Data ◽  
Primary Data ◽  
Small Scale ◽  
Large Contribution ◽  
Fishery Products ◽  
Margin Analysis ◽  
Fish Marketing

The rapid development of fishery products in Indonesia as well as a large contribution to Gross Domestic Product (GDP) especially from sea fishing business, unfortunately still not recognized. The scale of small-scale enterprises and the fisherman's status, mostly fishermen who are related to the fisherman's fish marketing system as a producer, have a weak position compared to the trader or industry as the buyer. This study aims to 1) to know Margin Analysis and Fisherman Analysis Share chain of fish marketing to fishermen and retailers; 2) to know the institutional role involved in the marketing of fishery products in TPI Karangantu. This research was conducted from September to October 2016 at TPI Karangantu Serang Banten. The research method used by collecting from primary data and secondary data with descriptive analysis, marketing margin analysis and Fisherman Share analysis. The results of the calculation of Marketing margin analysis and Fisherman Share analysis from fishermen to retailers in September - November were Bullfish Rp.3.999 and 84%, Bloated Fish Rp.5.483 and 82%, Japuh Fish Rp.2.164 and 75%, Lemuru Fish Rp. 2.444 and 89%, Fish Fly Rp. 2.487 and 90%, Mackerel Fish Rp. 5,063 and 91%, Anchovy Rp. 2,461 and 81%.

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