scholarly journals Study on Grade Division Policy for Trusted Network

2012 ◽  
Vol 12 ◽  
pp. 1367-1371
Author(s):  
Dongyun Long
Keyword(s):  
Grade Division

Theoretical Study on Bridge Structure Condition Evaluation Based on Health Monitoring Data

2014 ◽  
Vol 599-601 ◽  
pp. 751-754
Author(s):  
Zhao Lan Wei ◽  
Rui Yu ◽  
Chu Yun Cheng
Keyword(s):  
Evaluation Method ◽  
Monitoring Data ◽  
Evaluation Theory ◽  
Interval Numbers ◽  
Subjective Weight ◽  
Condition Evaluation ◽  
Interval Extension ◽  
Index Variation ◽  
Confidence Degree ◽  
Grade Division

After processed the signals obtained from monitoring system, one theory of condition evaluation was proposed on basis of a new evaluation parameter—index variation. One new condition grade division method was proposed from approximate statistic distribution of index variation, and as per the concept of confidence degree and confidence interval. Because the monitoring data and the standard of condition grade division were all interval numbers, interval extension evaluation theory was adopted to establish the model of condition evaluation. Set-Valued Statistics and gravity center based decision theory were introduced to divide weight into subjective weight and objective weight to make calculation. This evaluation method was found to be reasonable and had good project practicability.

scholarly journals Study on the Geological Condition Analysis and Grade Division of High Altitude and Cold Stope Slope

2021 ◽  
Vol 13 (22) ◽  
pp. 12464
Author(s):  
Ruichong Zhang ◽  
Shiwei Wu ◽  
Chenyu Xie ◽  
Qingfa Chen
Keyword(s):  
Low Temperature ◽  
High Altitude ◽  
Stable State ◽  
Geological Condition ◽  
Rock Layer ◽  
Eastern Slope ◽  
Geological Conditions ◽  
Grade Ii ◽  
Grade Division ◽  
Grade Iii

Analysis of the geological conditions of high-altitude and low-temperature stope slopes and the study of grade division are the basis for the evaluation of slope stability. Based on the engineering background of the eastern slope of the Preparatory iron mine in Hejing County, Xinjiang, we comprehensively analyse and summarize the factors that affect the geological conditions of high-altitude and cold slopes and finally determine nine geological conditions that affect the index parameters. Based on a back-propagation (BP) neural network algorithm, we establish an applicable network model to analyse the geological conditions of slopes in cold areas. The model is applied to the eastern slope to analyse and classify the geological conditions of the high-altitude and low-temperature slopes. The research results show that the skarn rock layer in the eastern slope is in a stable state and not prone to landslides, and its corresponding geological condition is Grade I; meanwhile, the monzonite porphyry rock layer is in a relatively stable state, with a potential for landslides and a corresponding geological condition Grade II. The marble rock layer is in a generally stable state, there is the possibility of landslide accidents, and the corresponding geological condition level is Grade III. The limestone rock layer is in an unstable state and prone to landslide accidents, it has a corresponding geology condition Grade IV. Therefore, the eastern slope can be divided into different geological condition regions: Zone I, Zone II, Zone III, and Zone IV, and the corresponding geological condition levels for these are Grade I, Grade II, Grade III, and Grade IV. These results may provide a basis for the stability evaluation of high altitudes and cold slopes.

Using Research in Teaching: Fourth-grade division: how much is retained in grade five

1973 ◽  
Vol 20 (1) ◽  
pp. 65-71
Author(s):  
Ray Kurtz
Keyword(s):  
Mathematical Knowledge ◽  
Fourth Grade ◽  
Fifth Grade ◽  
Knowledge And Skills ◽  
Difficult Time ◽  
Division Problems ◽  
Unique Nature ◽  
Division Process ◽  
Grade Division ◽  
Do So

Teachers acknowledge that the division process is difficult for children due to its unique nature of involving all basic mathematics operations. Fifth-grade teachers perennially have a difficult time understanding why they must do so much reteaching of division problems that are similar to those that the students studied during the fourth grade. It is also difficult for fourth-grade teachers to understand why the children need the reteaching in the fifth grade when they have observed, at the close of the fourth year, that the students seem to have the mathematical knowledge and skills needed for the next grade.

Construction Organization Optimization for Subgrade Engineering in Tropical Rainy Regions

2013 ◽  
Vol 353-356 ◽  
pp. 795-801
Author(s):  
Bo Yang ◽  
Rui Zhang ◽  
Shu Ping Luo ◽  
Ping He ◽  
Yu Feng Qiu
Keyword(s):  
Statistical Method ◽  
Correlation Coefficient ◽  
Random Variable ◽  
Exponential Relationship ◽  
Engineering Construction ◽  
Construction Period ◽  
Statistical Function ◽  
Long Time ◽  
Grade Division ◽  
Construction Organization

According to the highway subgrade engineering construction period serious delaying by rainy climate for a long time in the tropical rainy regions. The key process of the subgrade construction affected by climate is roadbed filling turning. Binding the law of rainy, Considered the continuous available period for filling turning as a random variable to analyze the correlation with its frequency, established the regression formula, the values of correlation coefficient is more than 0.95, shows that the continuous available period for filling turning presents good exponential relationship, A new statistical method of continuous available period for filling turning called selecting time construction concept was put forward. According the feasible probability of the continuous available period for filling turning, put forward a new grade division method for roadbed filling. Optimized the construction organization of the subgrade engineering by the statistical function of continuous available period for roadbed filling turning, and proved its reliability and achievability. Demonstration and reference were provided for the highway construction and local standardization in southern rainy regions.

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