Statistical evaluation of the service life of a complex shaped, large-scale part

1978 ◽  
Vol 10 (11) ◽  
pp. 1255-1262
Author(s):  
L. V. Konovalov ◽  
V. P. Kogaev ◽  
V. P. Vandyshev
Keyword(s):  
Service Life ◽  
Large Scale ◽  
Statistical Evaluation

scholarly journals Efficacy of Trans-geographic Observational Network Design for Revelation of Growth Pattern in Mountain Forests Across Europe

2021 ◽  
pp. 141-187
Author(s):  
H. Pretzsch ◽  
T. Hilmers ◽  
E. Uhl ◽  
M. del Río ◽  
A. Avdagić ◽  
...  
Keyword(s):  
Climate Change ◽  
Norway Spruce ◽  
Large Scale ◽  
Statistical Evaluation ◽  
European Beech ◽  
Growth And Yield ◽  
Silver Fir ◽  
Mountain Forests ◽  
Mixed Species ◽  
Yield Data

AbstractUnderstanding tree and stand growth dynamics in the frame of climate change calls for large-scale analyses. For analysing growth patterns in mountain forests across Europe, the CLIMO consortium compiled a network of observational plots across European mountain regions. Here, we describe the design and efficacy of this network of plots in monospecific European beech and mixed-species stands of Norway spruce, European beech, and silver fir.First, we sketch the state of the art of existing monitoring and observational approaches for assessing the growth of mountain forests. Second, we introduce the design, measurement protocols, as well as site and stand characteristics, and we stress the innovation of the newly compiled network. Third, we give an overview of the growth and yield data at stand and tree level, sketch the growth characteristics along elevation gradients, and introduce the methods of statistical evaluation. Fourth, we report additional measurements of soil, genetic resources, and climate smartness indicators and criteria, which were available for statistical evaluation and testing hypotheses. Fifth, we present the ESFONET (European Smart Forest Network) approach of data and knowledge dissemination. The discussion is focussed on the novelty and relevance of the database, its potential for monitoring, understanding and management of mountain forests toward climate smartness, and the requirements for future assessments and inventories.In this chapter, we describe the design and efficacy of this network of plots in monospecific European beech and mixed-species stands of Norway spruce, European beech, and silver fir. We present how to acquire and evaluate data from individual trees and the whole stand to quantify and understand the growth of mountain forests in Europe under climate change. It will provide concepts, models, and practical hints for analogous trans-geographic projects that may be based on the existing and newly recorded data on forests.

Method for speech inversion with large scale statistical evaluation

2011 ◽  
Author(s):  
Heikki Rasilo ◽  
Unto K. Laine ◽  
Okko Räsänen ◽  
Toomas Altosaar
Keyword(s):  
Large Scale ◽  
Statistical Evaluation

scholarly journals Preface-Special issue on “Analysis on structural performance”

2020 ◽  
Vol 3 (4) ◽  
Author(s):  
Huaping Wang
Keyword(s):  
Service Life ◽  
Large Scale ◽  
Performance Degradation ◽  
Scale Construction ◽  
Structural Performance ◽  
Special Issue ◽  
Safe Operation ◽  
Important Index ◽  
Practical Engineering ◽  
The Stability

Structural performance is the most important index to declare the stability, safety and durability of structures in practical engineering. The performance degradation of structures becomes more and more common with the increase of service life. To ensure the safe operation of structures, the hot research has gradually changed from large-scale construction to the detection, repair, reinforcement, renovation and maintenance.

scholarly journals RESEARCH ON POLICIES OF POWER BATTERIES RECYCLE IN CHINA FROM THE PERSPECTIVE OF LIFE CYCLE

2021 ◽  
Vol 29 (2) ◽  
pp. 135-149
Author(s):  
Di Wang
Keyword(s):  
Life Cycle ◽  
Service Life ◽  
Large Scale ◽  
Production Capacity ◽  
Battery Life ◽  
Power Battery ◽  
Life Cycle Perspective ◽  
Policy Suggestions ◽  
Legal Construction

As fueled by the rapid advancement of novel energies-based vehicles in our nation since 2015, Chinese production and ownership of novel energies-based vehicles in China have been leaping forward. According to 4—8 years’ service life of power batteries, China ushered into the large-scale scrapping phase of power batteries in 2019, so the power batteries recycle system should be urgently constructed. Given the life cycle perspective, the characteristics of each stage of the power battery life cycle are analyzed in the present study. As revealed from the results, the upstream end of the power batteries recycle system in China is not yet perfect, the production capacity at the midstream end tends to be excess, and the downstream end is in the exploratory phase. Moreover, the present study analyzes the policies throughout the life cycle of power batteries, and it is reported that the recycling policies at the midstream processing end are relatively concentrated, the upstream and downstream policies are comparatively deficient, the top-level legal construction is lacked, the recycling network is not perfect, and the incentive and guidance policies for echelon exploitation enterprises require modification, and relevant policy suggestions are proposed.

scholarly journals Rethinking the (near) future of postwar built environment: a systemic approach through façades-only replacement

Rivista Tema ◽  
2020 ◽  
Vol Vol.6 (2020) (N. 1) ◽  
Author(s):  
Paolo Piantanida ◽  
Antonio Vottari
Keyword(s):  
Climate Change ◽  
Service Life ◽  
Built Environment ◽  
Large Scale ◽  
Scale Construction ◽  
Building Stock ◽  
Suburban Areas ◽  
Urban Image ◽  
Near Future ◽  
Global Strategies

There is a noticeable portion of the Italian building stock, typically concentrated in suburban areas, whose performance obsolescence and vulnerability are worsening its value and urban image as well. Even though a large-scale construction replacement seems to be apparently the expected way to solve the problem, current global strategies towards the built environment demand different approaches. The paper identifies envelope replacement as a systemic and feasible tactic to extend the service life of such target buildings and to enhance their resilience towards climate change and users’ needs, also with positive fallouts for the environment and urban image.

scholarly journals Study on optimization of inspection mechanism of concrete beam bridge

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256028
Author(s):  
Dan Su ◽  
Yisheng Liu ◽  
Xintong Li ◽  
Zhicheng Cao
Keyword(s):  
Service Life ◽  
Prediction Model ◽  
Large Scale ◽  
Concrete Beam ◽  
Bridge Construction ◽  
Bridge Inspection ◽  
Single Index ◽  
State Prediction ◽  
Low Efficiency ◽  
Beam Bridge

China is shifting from the stage of large-scale bridge construction to the stage of equal emphasis on the construction and maintenance of bridges. The problems of low efficiency and high cost in bridge inspection are becoming more and more prominent, which threaten people’s life safety. In this paper, the deterioration state prediction model of concrete beam bridge under Boosting DT C5.0 was established as the basis, and optimization suggestions were put forward in terms of bridge inspection standards and processes, which aims to perfect the bridge inspection mechanism, realize the fine management of the bridge and prolong the service life of the bridge. Research shows that: first, the bridge inspection standard with a single index should be improved into the bridge inspection standard with multiple indexes, so as to scientifically determine the bridges that need to be inspected and optimize the allocation of maintenance resources. Second, the bridge deterioration state prediction model is used to add a screening mechanism for the bridge in the inspection plan, which can effectively reduce the workload of bridge inspection and enhance the inspection efficiency. Third, the deterioration phenomenon of coexistence between adjacent traffic assets should be fully considered and the linkage inspection mechanism of adjacent traffic assets should be established to improve the effect of bridge inspection.

Research on Energy Equation of Lubrication Model on Large-Scale Journal Bearing System

2010 ◽  
Vol 145 ◽  
pp. 139-144
Author(s):  
Jian Mei Wang ◽  
Qing Xue Huang ◽  
Jian Feng Kang ◽  
Yang Fan
Keyword(s):  
Service Life ◽  
Large Scale ◽  
Energy Equation ◽  
Journal Bearing ◽  
Hydrodynamic Lubrication ◽  
Journal Bearings ◽  
Calculation Results ◽  
Major Factors ◽  
Energy Equations ◽  
Bearing System

To prolong the service life of large-scale journal bearings, the major factors that have influences on bearing performances should be taken into account. By consideration of the variations of viscosity and density with pressure and temperature, a more thorough thermo-hydrodynamic lubrication model was established. With designation of variables with nondimensional parameters, a series of equations were nondimensionied, and the corresponding energy equations at different oil-film layers and boundaries were obtained respectively according to proper difference formats, and then solved by the integration of Finite Difference Method (FDM) with Boundary Element Method (BEM). Calculation results have proved that such complete mathematical model could provide great theoretical guide meaning to improve the lubrication performances and to prolong the service life of contact components of heavy journal bearings.

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