Statistical approach reveals tidal effect on the antibiotics and environmental relationship with the case study of Yongjiang Estuary, China

This paper demonstrates the statistical approach for describing failures and lifetimes of water mains. The statistical approach is based on pipe inventory data and the maintenance data registered in the data base. The approach consists of data pre-processing and statistical analysis. Two classes of statistical models are applied, namely counting process models and lifetime models. With lifetime models, one can estimate the probability which a pipe will fail within a time horizon. With counting process models one can see the deteriorating (or improving) trend in time of a group of “identical” pipes and their rates of occurrence of failure (ROCOF). The case study with the data base from Trondheim municipality (Norway) demonstrates the applicability of the statistical approach and leads to the following results: 1). In the past 20 years, Trondheim municipality has experienced approximately 250 to 300 failures per year. However, the number of failures per year will significantly increase in the near future unless better maintenance practice is implemented now. 2). Unprotected ductile iron pipes have a higher probability of failures than other materials. The average lifetime of unprotected ductile iron pipes is approximately 30 to 40 years shorter than the lifetime of a cast iron pipe. 3). Pipes installed 1963 and 1975 are most likely to fail in the future; 4) The age of a pipe does not play a significant role for the remaining lifetime of the pipe; 5). After 2 to 3 failures, a pipe enters a fast-failure stage (i.e., frequent multiple between failures).

Download Full-text

Mimic Visiting Styles by Using a Statistical Approach in a Cultural Event Case Study

Procedia Computer Science ◽

10.1016/j.procs.2016.09.071 ◽

2016 ◽

Vol 98 ◽

pp. 449-454 ◽

Cited By ~ 3

Author(s):

Salvatore Cuomo ◽

Pasquale De Michele ◽

Monica Pragliola ◽

Gerardo Severino

Keyword(s):

Statistical Approach ◽

Cultural Event

Download Full-text

A statistical approach for the integrated analysis of mine induced seismicity and numerical stress estimates, a case study—Part II: evaluation of the relations

International Journal of Rock Mechanics and Mining Sciences ◽

10.1016/j.ijrmms.2004.07.003 ◽

2005 ◽

Vol 42 (1) ◽

pp. 73-94 ◽

Cited By ~ 7

Author(s):

R.A. Mercer ◽

W.F. Bawden

Keyword(s):

Induced Seismicity ◽

Statistical Approach ◽

Integrated Analysis

Download Full-text

Analysis of Fairness Limit on Fuel Oil Consumption of TwoTail Test Based Excavator and Dump Truck A Case Study in PT XYZ

Journal of Innovation and Technology ◽

10.31629/jit.v1i1.2128 ◽

2020 ◽

Vol 1 (1) ◽

pp. 6-12

Author(s):

Bella Puspa Octaviania ◽

Supriyadi ◽

Ambran Hartono

Keyword(s):

Fuel Consumption ◽

Statistical Approach ◽

Fuel Oil ◽

Dump Truck ◽

Oil Consumption ◽

Mining Operations

A lack of method to find out the fairness limit of fuel consumption in mining operations enables statistical approach with two-tail test be applied to observe the fairness limit of actual fuel oil consumption compared to the manual handbook of its equipment. Fuel consumption according to the manual handbook for EXCA LIEBHERR 9350 excavator is 207.23 liters/hour and EXCA HITACHI 2500 is 191.51 liters/hour, while CATERPILLAR 777D Dump Truck is 36-53 liters/hour consider as low, 53-73, 8 liters/hour medium, and 73.8-96.5 liters/hour as high. This statistical approach has been carried out after fulfilling the concept of mechanized earth-moving. As a result, the differences in fuel consumption of LIEBHERR 9350 and HITACHI 2500 are 3.72% and 3.26%, which are still in range of a reasonable fuel consumption limit, while CAT 777D operating on LIEBHERR 9350 and CAT 777D operating on HITACHI 2500, each shows a difference in fuel consumption. The differences are 29.65%, meaning that it has exceeded the reasonable limits of fuel consumption and 7.15%, meaning that it is still in range of a reasonable fuel consumption limit.

Download Full-text