SURVEYING THE EFFECT OF GAS-VENT HOLE DIAMETER AND CLEARANCE BETWEEN PISTON AND CYLINDER ON AUTOMATIC FIRING SYSTEM OF 23mm ЗY23-2

2021 ◽  
pp. 77-86
Author(s):  
Anh Quang Mai
Keyword(s):  
Mathematical Modeling ◽  
Research Method ◽  
Model Building ◽  
System Change ◽  
Hole Diameter ◽  
System Of Equations ◽  
Real Model ◽  
Physics Model ◽  
Set Up ◽  
Firing System

On the basis of analyzing the real model 23mm ЗY23-2, the paper chooses an alternative physics model, building a mathematical modeling dynamics, set up a system of equations and solve to find the cycle of operation on automatic firing system, change some parameters of cylinder and study on its effect to do automatic firing system; besides surveying the effect of gas-vent hole diameter and clearance between piston and cylinder on automatic firing system of 23mm ЗY23-2. The research method is based on the calculation theory to ensure compliance with the manufacturer's gun design and use documents.

Sewer flow quality modelling

1997 ◽  
Vol 36 (5) ◽  
pp. 177-184
Author(s):  
Lennart Heip ◽  
Johan Van Assel ◽  
Patrick Swartenbroekx
Keyword(s):  
Model Calibration ◽  
Model Building ◽  
Quality Model ◽  
Hydraulic Behaviour ◽  
Measuring Campaign ◽  
Flow Quality ◽  
Wet Weather ◽  
Calibration And Verification ◽  
Set Up ◽  
Dry Weather Flow

Within the framework of an EC-funded SPRINT-project, a sewer flow quality model of a typical rural Flemish catchment was set up. The applicability of such a model is demonstrated. Furthermore a methodology for model building, data collection and model calibration and verification is proposed. To this end an intensive 9 month measuring campaign was undertaken. The hydraulic behaviour of the sewer network was continuously monitored during those 9 months. During both dry weather flow (DWF) and wet weather flow (WWF) a number of sewage samples were taken and analysed for BOD, COD, TKN, TP and TSS. This resulted in 286 WWF and 269 DWF samples. The model was calibrated and verified with these data. Finally a software independent methodology for interpretation of the model results is proposed.

scholarly journals Spatio-Temporal Hydrological Model Structure and Parametrization Analysis

2021 ◽  
Vol 9 (5) ◽  
pp. 467
Author(s):  
Mostafa Farrag ◽  
Gerald Corzo Perez ◽  
Dimitri Solomatine
Keyword(s):  
Hydrological Modeling ◽  
Model Building ◽  
Model Performance ◽  
Model Description ◽  
Generation Model ◽  
Model Structure ◽  
Runoff Generation ◽  
Spatial Sensitivity ◽  
Spatio Temporal ◽  
Set Up

Many grid-based spatial hydrological models suffer from the complexity of setting up a coherent spatial structure to calibrate such a complex, highly parameterized system. There are essential aspects of model-building to be taken into account: spatial resolution, the routing equation limitations, and calibration of spatial parameters, and their influence on modeling results, all are decisions that are often made without adequate analysis. In this research, an experimental analysis of grid discretization level, an analysis of processes integration, and the routing concepts are analyzed. The HBV-96 model is set up for each cell, and later on, cells are integrated into an interlinked modeling system (Hapi). The Jiboa River Basin in El Salvador is used as a case study. The first concept tested is the model structure temporal responses, which are highly linked to the runoff dynamics. By changing the runoff generation model description, we explore the responses to events. Two routing models are considered: Muskingum, which routes the runoff from each cell following the river network, and Maxbas, which routes the runoff directly to the outlet. The second concept is the spatial representation, where the model is built and tested for different spatial resolutions (500 m, 1 km, 2 km, and 4 km). The results show that the spatial sensitivity of the resolution is highly linked to the routing method, and it was found that routing sensitivity influenced the model performance more than the spatial discretization, and allowing for coarser discretization makes the model simpler and computationally faster. Slight performance improvement is gained by using different parameters’ values for each cell. It was found that the 2 km cell size corresponds to the least model error values. The proposed hydrological modeling codes have been published as open-source.

scholarly journals Auxiliary branch method and modified nodal voltage equations

2008 ◽  
Vol 6 ◽  
pp. 157-163 ◽  
Author(s):  
A. Reibiger
Keyword(s):  
Constitutive Equations ◽  
System Of Equations ◽  
Terminal Behavior ◽  
Set Up ◽  
Nodal Voltage

Abstract. A theorem is presented describing a transformation by means of which it is possible to assign to an elementary multiport with fairly general constitutive equations (including all kinds of controlled sources, nullors, ideal transformers, etc.) a modified multiport with the same all-pole terminal behavior. The branch set of this modified multiport is augmented with so called auxiliary branches whereas its constitutive equations are always in conductance form. Therefore an interconnection of a family of multiports transformed in this manner can always be analyzed by means of a system of nodal voltage equations. It will be shown that this system of equations is equivalent to a system of modified nodal voltage equations set up for the network that is an interconnection of the elementary multiports originally given.

scholarly journals Comparative analysis of cycloid pump based on CFD and fluid structure interactions

2020 ◽  
Vol 12 (11) ◽  
pp. 168781402097353
Author(s):  
Wang Yanhua ◽  
Huang Longlong ◽  
Liu Yong ◽  
Xu Jingsong
Keyword(s):  
Model Building ◽  
Contact Point ◽  
Great Influence ◽  
Test Results ◽  
Fluid Structure Interactions ◽  
Fluid Structure ◽  
Mean Values ◽  
Calculation Results ◽  
Different Temperatures ◽  
Set Up

At present, in the aspect of numerical simulation of cycloid pump, most studies focused on CFD (Computational Fluid Dynamics) in analyzing the pump performance under different service conditions (such as speed, temperature, etc.). The characteristics of the pump under FSI (Fluid Solid Interaction) have not been considered yet. By means of the dynamic mesh technique in the rotating domain, the fluid structure coupling interface is set up on a cycloidal pump model building in COMSOL. The simulation results obtained by applying CFD and FSI are improved by experimental verification. The results show that: (1) the average flow rate of FSI simulation is closer to the test results, and the mean values of CFD and FSI pressure are closer to the actual outlet boundary settings; (2) by comparing the velocity and pressure of rotation region of CFD and FSI at different temperatures, it is concluded that the pressure CFD calculated in the region is more than FSI, and the velocity CFD calculated is less than FSI; (3) by comparing the pressure distribution at some contact point of the fluid structure coupling interface, it is concluded that the fluctuation value of the pressure of CFD with time is greater than that of FSI. Through the comparison, it is found that the coupling has a great influence on the calculation results. The FSI analysis of the pump makes the analysis results more real and more conducive to the analysis of the flow field and rotor dynamics characteristics of the pump.

6 Compassionate neighbours – an innovative model building caring communities

2018 ◽  
Vol 8 (3) ◽  
pp. 362.1-362 ◽  
Author(s):  
Carly Attridge ◽  
Heather Richardson
Keyword(s):  
Community Development ◽  
Social Movement ◽  
Terminal Illness ◽  
Model Building ◽  
Community Members ◽  
The Social ◽  
Recent Conference ◽  
Development Context ◽  
Caring Communities ◽  
Set Up

IntroductionIn 2014 St Joseph’s Hospice set up compassionate neighbours (CN) to address social isolation for those experiencing a chronic or terminal illness. Built on foundations of community development principles the neighbours provide emotional and social support to community members. With significant funding from Nesta we are upscaling the project with seven other hospices.AimOur aim is to build a wider network of CN who are supporting people in their local communities; we will test and learn how the project can be replicated in other areas. Our ultimate aim is to create a social movement establishing a network of CNs across the country.MethodWe are training and mentoring other hospice adopters to replicate the project in their own areas whilst testing which ingredients are key to the success of the project. Our review of the programme including formal evaluation will form the basis for a potential national roll out across the country.ResultsReview of our progress including a recent conference for CN feedback from hospice CEOs and project leads describes ongoing interest in the CN programme. There is additional interest from other hospices and other organisations outside of the Nesta programme. That said challenges exist around local implementation of a model shaped elsewhere translation of particular principles underpinning the CN programme and concerns around long-term sustainability and ownership of the network.ConclusionFurther thought is required about how to build the social movement and whether this effort should sit within the hospice sector or within a community development context in the future.

scholarly journals Geography of fields in extra dimensions: String theory lessons for particle physics

2015 ◽  
Vol 30 (10) ◽  
pp. 1530008 ◽  
Author(s):  
Hans Peter Nilles ◽  
Patrick K. S. Vaudrevange
Keyword(s):  
String Theory ◽  
Particle Physics ◽  
Extra Dimensions ◽  
Model Building ◽  
Unified Theory ◽  
Fundamental Interactions ◽  
Spatial Dimensions ◽  
Physics Model ◽  
String Theories

String theoretical ideas might be relevant for particle physics model building. Ideally one would hope to find a unified theory of all fundamental interactions. There are only a few consistent string theories in D = 10 or 11 spacetime dimensions, but a huge landscape in D = 4. We have to explore this landscape to identify models that describe the known phenomena of particle physics. Properties of compactified six spatial dimensions are crucial in that respect. We postulate some useful rules to investigate this landscape and construct realistic models. We identify common properties of the successful models and formulate lessons for further model building.

PENYELEWENGAN TUJUAN PENDIRIAN BADAN USAHA PENUNJANG KEGIATAN OLEH LEMBAGA YAYASAN DALAM PERSPEKTIF UNDANG-UNDANG YAYASAN

2020 ◽  
Vol 17 (1) ◽  
pp. 31-43
Author(s):  
Ida Bagus Bayu Brahmantya
Keyword(s):  
Research Method ◽  
Legal Issues ◽  
Comparative Approach ◽  
Legal Research ◽  
Real Effect ◽  
Historical Approach ◽  
Set Up ◽  
Article 5

This research is entitled "Misappropriation of Establishment Objectives of Supporting Business Activities by Foundation Institutions in Foundation Law Perspectives." The background of this research is the opportunity to misuse Foundation institutions that can occur because the Foundation can carry out business activities to achieve the aims and objectives of establishing the Foundation with how to set up a business entity or participate in a business entity. Article 5 of the Foundation Law stipulates that the wealth of the Foundation, including the proceeds of the Foundation's business activities, is the full wealth of the Foundation to be used to achieve the aims and objectives of the Foundation. Criminal provisions against violations of the Article are regulated in Article 70 of the Foundation Law, for those who violate the provisions of imprisonment for a maximum of 5 (five) years and are obliged to return it. Article 6 of the Foundation Law is used as a shield against the prohibition. This study focuses on two legal issues, namely, how is the Foundation's business activities to obtain profits as capital in managing the Foundation according to the Foundation Law? And what about sanctions for misappropriation of a Foundation's business activities according to the Foundation Law? The research method used in analyzing legal issues in this study is the normative legal research method. This normative legal research is carried out using the statutory approach, the historical approach to the comparative approach. Based on the analysis, it is known that the Foundation Law uses the method of prevention by including provisions that do not allow or at least, complicating the misuse of the foundation by the organs of the Foundation. However, in the Foundation Law there is a legal obscurity that affects the attitude and quantity of non-compliance and has a real effect on legal behavior, including the behavior of lawbreakers. Keywords: Foundation, Criminal, Business Entity, Misappropriation.

Interpreter's Corner

2020 ◽  
Vol 39 (11) ◽  
pp. 828-833
Author(s):  
Henrik Roende ◽  
Dan Chaikin ◽  
Yi Huang ◽  
Konstantin N. Kudin
Keyword(s):  
Model Building ◽  
New Technology ◽  
Waveform Inversion ◽  
Velocity Model ◽  
Ocean Bottom ◽  
Hydrocarbon Traps ◽  
Full Waveform ◽  
Velocity Model Building ◽  
Long Offset ◽  
Set Up

The U.S. Gulf of Mexico (GoM) geology is well known for prolific structural hydrocarbon traps created by salt tectonics. In many areas, these structures lie below salt overhangs or thick canopies, requiring advanced seismic imaging to identify prospects and plan exploration wells. Ever-evolving geophysical technologies, such as 3D seismic, wide azimuth, multiwide azimuth, coil, and ocean-bottom node (OBN) acquisition designs, have unlocked the image for some of these structures over the past three decades. Recently, automatic velocity model building methods, particularly full-waveform inversion (FWI), introduced another step change in the subsalt image quality and refocused the acquisition methods on the need to acquire long-offset data. To make such a long-offset program affordable, a new survey geometry was set up with sparse OBN nodes and simultaneous shooting. The actual survey was acquired in 2019 and fully processed within 15 months from the end of the acquisition. Offsets up to 65 km were recorded, enabling FWI velocity updates down to 15 km depth. To provide the reader with a glimpse of the geologic insight that the new technology enabled, we report a few examples of deep geology revealed by this survey in a hydrocarbon- and seismic-data-rich area of the GoM — the Greater Mars-Ursa Basin.

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