Study on Water Cushion Belt Conveyor

2014 ◽  
Vol 1016 ◽  
pp. 14-18
Author(s):  
Xian Wei Liu ◽  
Jia Sheng Wang ◽  
Lan Tao Wu ◽  
Xin Zhang ◽  
Hua Cheng
Keyword(s):  
Reynolds Equation ◽  
Belt Conveyor ◽  
Working Mechanism ◽  
Film Properties ◽  
Practical Applications ◽  
Lubrication Equation ◽  
Start Up ◽  
New Type ◽  
Air Cushion ◽  
Lubricating Mechanism

Based on air cushion belt conveyor, a new type of belt conveyor named water cushion belt conveyor is proposed. It has a wide scope of applications for its features such as stability and reliability, capability of full load start-up, and environment-friendliness. This paper studies the working mechanism and lubricating mechanism of the water cushion belt conveyor. The basic lubrication equation of the water cushion is deduced from the universal form of the Reynolds equation used to study the pressure film properties of the water cushion. The design of the key part of the water cushion device is described in details. The research can be taken as a reference in practical applications.

Experimental Research on Water Cushion Belt Conveyor

2013 ◽  
Vol 431 ◽  
pp. 88-92
Author(s):  
Ai Dong Zhang ◽  
Ri Cheng Xu ◽  
Yun Meng ◽  
Xun Fan
Keyword(s):  
Experimental Study ◽  
Influencing Factors ◽  
Experimental Research ◽  
Industrial Application ◽  
Theoretical Basis ◽  
Belt Conveyor ◽  
New Type ◽  
Air Cushion

Water cushion belt conveyor is a new type of continuous conveyor which develops from belt conveyor and air cushion belt conveyor .By experimental research on water cushion belt conveyor ,we can observe the condition of water cushion and accomplish the date acquisition of water cushion pressure .Analyzing the pressure ,we can get influencing factors of water cushion pressure and verify the feasibility of industrial application of water cushion belt conveyor .Combining theory study with experimental study ,provide theoretical basis and guide for the further progress of water cushion belt conveyor .

Non-adhesive lotus and other hydrophobic materials

2008 ◽  
Vol 366 (1870) ◽  
pp. 1539-1556 ◽  
Author(s):  
David Quéré ◽  
Mathilde Reyssat
Keyword(s):  
Solid Surface ◽  
Room Temperature ◽  
Water Repellency ◽  
Short Review ◽  
Water Repellent ◽  
Practical Applications ◽  
Hydrophobic Materials ◽  
Volatile Liquid ◽  
Air Cushion ◽  
The Stability

Superhydrophobic materials recently attracted a lot of attention, owing to the potential practical applications of such surfaces—they literally repel water, which hardly sticks to them, bounces off after an impact and slips on them. In this short review, we describe how water repellency arises from the presence of hydrophobic microstructures at the solid surface. A drop deposited on such a substrate can float above the textures, mimicking at room temperature what happens on very hot plates; then, a vapour layer comes between the solid and the volatile liquid, as described long ago by Leidenfrost. We present several examples of superhydrophobic materials (either natural or synthetic), and stress more particularly the stability of the air cushion—the liquid could also penetrate the textures, inducing a very different wetting state, much more sticky, due to the possibility of pinning on the numerous defects. This description allows us to discuss (in quite a preliminary way) the optimal design to be given to a solid surface to make it robustly water repellent.

scholarly journals The dynamics of Pecking Order and Agency theories on crowdfunding concept as alternate finance for start-up businesses

2020 ◽  
Vol 5 (1) ◽  
pp. 1-13
Author(s):  
Francis Kwaku Kuma ◽  
Mohd Effandi Yosuff
Keyword(s):  
Theoretical Aspect ◽  
Review Of Literature ◽  
Pecking Order ◽  
Practical Applications ◽  
Theoretical Perspectives ◽  
Start Up ◽  
Key Concepts ◽  
Definition Of ◽  
The Relationship

The study explores the relevance of theoretical aspect of crowd financing by reviewing the defining literature on Pecking Order and Agency theories in details and evaluates applications of these theories based on crowdfunding. In particular, the study critically considers the key concepts of these theories and how they could be applied in practical terms. The study decides to adopt Pecking Order and the Agency theories because they provide valuable insights into the trend of crowdfunding streams available to firms. The paper primarily adds to existing literature on the broader definition of crowdfunding as a concept and then examine the relationship between this concept and its practical applications to the chosen theories. The study combines these theoretical perspectives with the practical aspects of startup companies raising finance using the crowd because a broad reading of the literature tends to point to in this direction. The key concepts of these theories are critically considered and the study is conducted in the form of review of literature and expression of opinion. Citation: author1, author2, author3. The dynamics of Pecking Order and Agency theories on crowdfunding concept as alternate finance for start-up businesses. 2020; 4(1): 1－13.Received: (February 2, 2020) Accepted: (March 31, 2020)

Introducing a Computer-Adaptive Testing System to a Small School District

2011 ◽  
pp. 143-156
Author(s):  
Tim Pelton ◽  
Leslee Francis Pelton
Keyword(s):  
School District ◽  
Essential Elements ◽  
Testing System ◽  
Measures Of Academic Progress ◽  
Small School ◽  
Northwest Evaluation Association ◽  
Computer Adaptive Test ◽  
Practical Applications ◽  
Small School District ◽  
New Type

A computer-adaptive test (CAT) is a relatively new type of technology in which a computer program “intelligently” selects and presents questions to examinees according to an evolving estimate of achievement and a prescribed test plan. A well written CAT can be expected to efficiently produce student achievement estimates that are more accurate and more meaningful than a typical teacher-generated paper and pencil (P&P) test with a similar number of questions. Although this method of testing sounds good in theory, many schools and districts are waiting for positive examples of practical applications and observable benefits before adopting a CAT. This chapter begins by describing the essential elements of meaningful measurement in education and the features of a typical CAT. Next, we describe the Measures of Academic Progress (MAP) system of the Northwest Evaluation Association (NWEA; 2004) and observations made during the introduction of this system into a small semirural school district. Finally, as independent observers, we provide a set of recommendations to help guide other districts as they consider the potentials of implementing a CAT system to guide instruction within their schools.

On the steady posture of conical spindle distribution used in ball piston pump

2019 ◽  
Vol 234 (4) ◽  
pp. 490-499
Author(s):  
Junjie Zhou ◽  
Chongbo Jing ◽  
Jianhao Liu
Keyword(s):  
Reynolds Equation ◽  
Static Pressure ◽  
Structural Parameters ◽  
Hydraulic Pump ◽  
Working Pressure ◽  
Theoretical Support ◽  
Pressure Boundary Condition ◽  
Network Method ◽  
New Type ◽  
Gap Height

Conical spindle distribution is a new type of hydraulic pump distribution, its steady working conditions refer to a stable position of the shaft and lubrication state under constant operating condition, which directly influences the hydraulic pump efficient and reliable work. In this paper, the Reynolds equation of the tapered flow field is used to establish the lubrication model. The static pressure boundary condition of the distribution pair is obtained by the hydraulic resistance network method. The finite difference method is employed to solve the model. The static and dynamic lubricating performances including the shaft eccentricity and the distribution gap height are obtained by solving the model with a numerical method. Accordingly, the influences of structural parameters and operating parameters on the steady state are investigated, and an experimental test rig is built to validate the model. The experimental results show that the model can predict the higher working pressure which leads to higher distribution gap and eccentricity; the higher the rotational speed is, the smaller the distribution gap and the eccentricity will become, which provides theoretical support for further guidance of the distribution design.

Research on Man-Machine Function Allocation of Tank Fire Control System

2012 ◽  
Vol 580 ◽  
pp. 160-164
Author(s):  
Tian Qing Chang ◽  
Dong Chen ◽  
Jun Wei Chen
Keyword(s):  
Control System ◽  
System Design ◽  
Engineering Application ◽  
Current Method ◽  
Control System Design ◽  
Fire Control ◽  
Working Mechanism ◽  
Level Of Automation ◽  
Function Allocation ◽  
New Type

Man-machine function allocation is an important step in new type tank fire control system design. Aiming at the problem of engineering application abilities deficiency in current method, a flow of function allocation is proposed. System working mechanism, functions and tasks are analyzed to define the level of automation and guide preliminary design. AHP is adopted to seek out the optimal plan. The method can offer new theory reference for intelligent tank fire control system design.

scholarly journals Risk-Limiting Real-Time Economic Dispatch in a Power System with Flexibility Resources

Energies ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 3133 ◽  
Author(s):  
Hongji Lin ◽  
Chongyu Wang ◽  
Fushuan Wen ◽  
Chung-Li Tseng ◽  
Jiahua Hu ◽  
...  
Keyword(s):  
Power System ◽  
Real Time ◽  
Value At Risk ◽  
Renewable Energy Sources ◽  
Economic Dispatch ◽  
Conditional Value At Risk ◽  
Operational Flexibility ◽  
Practical Applications ◽  
Start Up ◽  
The Impact

The integration of numerous intermittent renewable energy sources (IRESs) poses challenges to the power supply-demand balance due to the inherent intermittent and uncertain power outputs of IRESs, which requires higher operational flexibility of the power system. The deployment of flexible ramping products (FRPs) provides a new alternative to accommodate the high penetration of IRESs. Given this background, a bi-level risk-limiting real-time unit commitment/real-time economic dispatch model considering FRPs provided by different flexibility resources is proposed. In the proposed model, the objective is to maximize the social surplus while minimizing the operational risk, quantified using the concept of conditional value-at-risk (CVaR). Energy and ramping capabilities of conventional generating units during the start-up or shut-down processes are considered, while meeting the constraints including unit start-up/shut-down trajectories and ramping up/down rates in consecutive time periods. The Karush–Kuhn–Tucker (KKT) optimality conditions are then used to convert the bi-level programming problem into a single-level one, which can be directly solved after linearization. The modified IEEE 14-bus power system is employed to demonstrate the proposed method, and the role of FRPs in enhancing the system flexibility and improving the accommodation capability for IRESs is illustrated in some operation scenarios of the sample system. The impact of the confidence level in CVaR on the system operational flexibility is also investigated through case studies. Finally, a case study is conducted on a regional power system in Guangdong Province, China to demonstrate the potential of the proposed method for practical applications.

“Yes Madam”: digitized services right here and right now

2020 ◽  
Vol 10 (2) ◽  
pp. 1-20
Author(s):  
Shikha Singh ◽  
Shweta Mittal
Keyword(s):  
Learning Outcomes ◽  
Mobile Application ◽  
Working Mechanism ◽  
Middle Income ◽  
Web Based ◽  
Content Type ◽  
Digital Service ◽  
Marketing Model ◽  
Academic Level ◽  
Start Up

Learning outcomes The case helps to understand: the working mechanisms of a digitized salon service, with a focus on the lower- and middle-income strata. The changing scenario of the service marketing model, with the growth in digital service models. To investigate the organisational challenges of a digitally facilitated/based start-up and find solutions to overcome the challenges. Case overview/synopsis “Yes Madam”-salon at home was a business enterprise, providing beauty and wellness services at the doorstep through a mobile application and web-based platform. The case describes the reason for opening the doorstep beauty services, its revenue model and aims to provide quality services to lower- and middle-income strata. The case will help students to understand the working mechanism of digitized salon services and associated challenges; prominent ones being attracting, selecting and retaining the beauticians and providing the standardised services. The case has examined the low-price services for the consumers delivered by the company. The case also discussed their plans for diversification and penetration into the untapped markets. Complexity academic level Graduates and postgraduates. Supplementary materials Teaching Notes are available for educators only. Subject code CSS 3: Entrepreneurship.

Temperature rise characteristics of a new designed disc for inclined downward belt conveyor

2014 ◽  
Vol 66 (6) ◽  
pp. 671-677
Author(s):  
Qingrui Meng
Keyword(s):  
Temperature Rise ◽  
Coal Mines ◽  
Disc Brake ◽  
Belt Conveyor ◽  
Gas Explosion ◽  
Running Speed ◽  
Content Type ◽  
Practical Applications ◽  
Disc Surface ◽  
Braking Process

Purpose – The aim of this work is to reveal the temperature rise characteristics of the new designed disc during a braking process. In underground coal mines, the highest temperature of the disc brake used for inclined downward belt conveyors should be < 150 to prevent gas explosion during a braking process. To meet the requirements, a new type of disc was designed. Design/methodology/approach – By using ANSYS software, the disc surface and interior temperature rise variations, effect of braking time and running speed on temperature rise are analyzed numerically. Findings – The results show that the new designed disc can meet the coal mines’ requirements well, during the braking process the disc surface temperature increases at first and then decreases, there is an obvious temperature gradient in the axial direction; when running speed increases to two times of the rated one, the highest temperature nearly reaches 150; and a prolonged braking time can decrease the highest temperature effectively. Research limitations/implications – It indicates that the disc brake should act as earlier as possible to slow down the belt conveyor when overspeed occurs; and when the running speed increases to two times of the rated one, the braking time must be prolonged to prevent gas explosion. Originality/value – Research findings of this paper provides theoretical basis for the practical applications of the disc brake used for inclined downward belt conveyor.

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