scholarly journals Quantitative Evaluation of Weathering Degree through Fuzzy-AHP Method and Petrophysics Analysis for Sandstone Carvings

2021 ◽  
Author(s):  
Mingshen Shao ◽  
Dong Xu ◽  
Yuchao Wang ◽  
Ziyi Wang ◽  
Xingzhou Liang ◽  
...  
Keyword(s):  
Sulfuric Acid ◽  
Water Absorption ◽  
Ultrasonic Velocity ◽  
Fuzzy Ahp ◽  
Great Influence ◽  
Surface Hardness ◽  
Sulfate Solution ◽  
Ahp Method ◽  
Standard Samples ◽  
Weathering Degree

Abstract Study on weathering degree assessment of sandstone carvings play an important role in scientific conservation. However, current state of research on weathering assessment cannot reach the needs of scientific evaluation. In this study, the selected sandstones originate from Jurassic and, soluble salt and acid simulation experiments were carried out on standard samples. The weight, specimen surface hardness, ultrasonic velocity and water absorption are measured by means of the non-destructive methods. Furthermore, mineral composition and petrophysical properties are analyzed on small specimens in laboratory. It is revealed that the main mineral, such as quartz and feldspar, is shown by oblate and prolate in shape. Moisture content has great influence on compressive strength of rock samples. Rock porosity increases with deterioration process. The decrease of quality, surface hardness and ultrasonic velocity with increasing cycles. Conversely, water absorption capillary increase over cycles. In addition, Fuzzy-AHP method is adopted to further evaluate weathering degree on experiment samples. Results in macroscopic show that the value of weathering degree is 0.3271 for sodium sulfate solution, which is shown by moderate weathering; 0.1951 for pH = 1 sulfuric acid and 0.1060 for pH = 2 sulfuric acid, which is characterized by low weathering; 0.0516 for pH = 3 sulfuric acid and 0.0421 for pH = 4 sulfuric acid, belonging to very low weathering.

Microwave-Assisted Leaching Vanadium from Stone Coal

2011 ◽  
Vol 189-193 ◽  
pp. 3916-3919 ◽  
Author(s):  
Hong Zhou Ma ◽  
Xin Zhe Lan ◽  
Yao Ning Wang ◽  
Yu Hong Tian
Keyword(s):  
Sulfuric Acid ◽  
Microwave Power ◽  
Orthogonal Design ◽  
Chemical Constituents ◽  
Influence Factors ◽  
Sulfate Solution ◽  
Leaching Rate ◽  
Stone Coal ◽  
Microwave Assisted ◽  
Design Experiments

Technological process of microwave-assisted leaching of vanadium with sulfate solution has been defined on the base of phase and chemical constituents of stone coal. The influence factors such as content of sulfuric acid, microwave power, and leaching time were studied on leaching rate of vanadium from the stone coal. One element experiments and orthogonal design experiments are carried out to achieve optimized parameters. The experimental results showed that the leaching rate of vanadium was improved by the change of influence factors at some range. The single leaching rate of vanadium reached 80.9% under the optimal conditions of sulfuric acid content of 12%, microwave power 539w,leaching time of 2h.

scholarly journals Risk Identification and Assessment in PPP Infrastructure Projects using Fuzzy Analytical Hierarchy Process and Life-Cycle Methodology

2012 ◽  
Vol 8 (1) ◽  
pp. 34-48 ◽  
Author(s):  
Jie Li ◽  
Patrick Zou
Keyword(s):  
Life Cycle ◽  
Fuzzy Ahp ◽  
Risk Identification ◽  
Infrastructure Projects ◽  
Fuzzy Analytical Hierarchy Process ◽  
Ahp Method ◽  
The Public ◽  
Project Life Cycle ◽  
Project Life ◽  
Hierarchy Process

To fulfil the increasing demands of the public,Public Private Partnership (PPP) has beenincreasingly used to procure infrastructureprojects, such as motor ways, bridges, tunnelsand railways. However, the risks involved inPPP projects are unique and dynamic due tolarge amount of investment and longconcession period. This paper aims to developa risk identification framework from theperspectives of project life cycle, and anassessment framework for risks associatedwith PPP project using fuzzy analyticalhierarchy process (AHP). First the paperreviews the current literature to identifycommon risks in PPP infrastructure projectsand classification methods used. The risksidentified from the literature were classifiedusing project life cycle perspectives. Followingthat, the paper presents the advantages offuzzy AHP. Furthermore, the paper provides aframework for assessment of risks in PPPprojects followed by an illustrative examplewhere the data was obtained from surveyquestionnaires. The paper concludes that risksassociated in PPP infrastructure projects areunique and therefore it is beneficial to classifythem from project life cycle perspectives, andthe proposed fuzzy AHP method is suitable forthe assessment of these risks.

scholarly journals Rating Effective Factors on Motivating Employees for Job Persistence by Using Fuzzy AHP Method: A Case Study among the Employees of the Deqat Khodro Kousha (IPACO) Company

2016 ◽  
Vol 12 (7) ◽  
pp. 159
Author(s):  
Seyed Mehdi Khadem ◽  
Darush Rahmati ◽  
Ali Yavari ◽  
Seyed Ehsan Etemadifar ◽  
Alireza Eftekharian
Keyword(s):  
Human Resources ◽  
Fuzzy Ahp ◽  
Field Research ◽  
Ahp Method ◽  
Financial Status ◽  
Effective Factors ◽  
Needed Information ◽  
Library Research ◽  
First Time

The goal of this research is to prioritize effective factors on motivating employees to keep on working and determining the most important effective factors on the employees' motivation. In this paper, to grade effective factors on the employees' motivation for keeping on to work, the Fuzzy AHP method, which is one of the multi-standard decision-making methods was utilized. Field research and library research methods were used for collecting the needed information.  Results indicated that among the effective factors on the employees' motivation for job persistence, the health factor is the most important and financial status is the second most important factor. The least importance is given to the significance of the work for that person. In this paper, the effective factors on the employees' motivation for job persistence were rated for the first time. Results of this research are very useful in devising strategies that are related to keeping employees for the human resources' executives. The results of this paper are not applicable to all organizations. Furthermore, in this research, only the factors with positive impacts on employees for job persistence were rated.

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