Effect of Ball Material Ratio on the Grinding Efficiency of Copper-Bearing Minerals in Dahongshan

2012 ◽  
Vol 616-618 ◽  
pp. 619-623 ◽  
Author(s):  
Chun Mei Wang ◽  
Gu Zhang Zhuang ◽  
Hai Yin
Keyword(s):  
Critical Value ◽  
Optimal Range ◽  
Operation Optimization ◽  
Particle Size Fractions ◽  
Fine Grinding ◽  
Optimal Value ◽  
Value Range ◽  
Optimal Value Range ◽  
The One ◽  
Grinding Efficiency

In this paper, The Copper-bearing minerals Powder (≤2mm) in Dahongshan is used in conical ball grinding, the experimental study shows that the effect of ball material ratio on the grinding efficiency is obvious. The critical value and the optimal value range of the ball material ratio are different on different grinding stages, the feasible ball material ratio of coarse grinding is bigger than the one of fine grinding. In the test conditions, in terms of the ball material ratio, the critical value of ores’ over crushing in coarse grinding is 13, and the optimal range is 6-8, which is beneficial to the next beneficiation; while the critical value in fine grinding is 7 and the optimal range is 5-7. Although the ball material ratios are different, the change rule of grinding fineness corresponding to different particle size fractions is consistent, which can be used as a reference in the site operation optimization.

The optimal value range problem for the Interval (immune) Transportation Problem

Omega ◽  
2020 ◽  
Vol 95 ◽  
pp. 102059 ◽  
Author(s):  
C. D’Ambrosio ◽  
M. Gentili ◽  
R. Cerulli
Keyword(s):  
Transportation Problem ◽  
Optimal Value ◽  
Value Range ◽  
Optimal Value Range

Experimental Study on Removal of NO Using H2O2/UV System

2014 ◽  
Vol 955-959 ◽  
pp. 2300-2305
Author(s):  
Rong Zhi Zhao ◽  
Bao Rui Liang ◽  
Ying Chen ◽  
Cun Yi Song ◽  
Zhen Song Tong ◽  
...  
Keyword(s):  
Experimental Study ◽  
Gas Flow ◽  
Solution Concentration ◽  
No Removal ◽  
Initial Concentration ◽  
Experimental Platform ◽  
Optimal Value ◽  
Value Range ◽  
Optimal Value Range ◽  
Removal System

In this paper, use homemade experimental platform to experimental study on removal of NO using H2O2/UV system. The factors include concentration of H2O2, initial concentration of NO, concentration of O2, temperature of H2O2solution, concentration of a metalic catalyst, gas flow. Carrying on orthogonal test with the above 6 factors, determining the optimal value range of the various influencing factors and the optimal technical conditions are determined. When concentration of H2O2is 8%, concentration of O2is 5%, gas flow is 850ml/min, initial concentration of NO is 650mg/m3, temperature of H2O2solution is 55°C, the mole ratio of Fe2+is 1:300, then the NO removal is 88.6%. Based on this discussion and analysis, the H2O2/UV system of NO Removal system has certain technical popularization.

scholarly journals Research on the influence of design parameters on mechanical performance of net arch bridge

2021 ◽  
Vol 272 ◽  
pp. 02006
Author(s):  
Xinke Cao ◽  
Zheyuan Lu ◽  
Xianwu Hao ◽  
Guojun Yang
Keyword(s):  
Mechanical Performance ◽  
Element Model ◽  
Internal Force ◽  
Design Parameters ◽  
Arch Bridge ◽  
Vehicle Load ◽  
Optimal Value ◽  
Value Range ◽  
Optimal Value Range ◽  
Tied Arch Bridge

In order to study the suspender layout parameters and design parameters of the tied arch bridge with mesh suspenders under the action of vehicle load, the structure stress is more reasonable and meets the higher economy and aesthetics. Taking a 96m span reticulated tied arch bridge as the engineering background, the finite element model is established by using Midas/Civil 2019 program. The variation law of internal force and Suspender Force of the structure is calculated and analysed under the change of rise span ratio and suspender number parameters, and the relatively optimal value range of corresponding parameters is given. The results show that the rise span ratio should be 0.2-0.24; The number of Suspenders for one side arch rib should be 34-38; The relatively optimal range of the above parameters is discussed for reference.

Influences of eccentricity ratio on the internal flow and cavitation characteristics of progressing cavity pump

2021 ◽  
pp. 095440622199840
Author(s):  
Yiran Wang ◽  
Xiaodong Yu ◽  
Xiaoxiao Han ◽  
Hao Yan ◽  
Qiang Li ◽  
...  
Keyword(s):  
Internal Flow ◽  
Test Method ◽  
Volume Distribution ◽  
Eccentricity Ratio ◽  
Eccentric Rotation ◽  
Optimal Value ◽  
Pump Test ◽  
Value Range ◽  
Contrast Analysis ◽  
Volume Efficiency

A Progressing Cavity Pump (PCP) works by forming a progressive seal cavity through the eccentric rotation of rotor. PCP parameters, such as eccentricity ratio [Formula: see text], can influence its performance and cavitation characteristics. The internal correlation among clearance fluid, cavitation characteristics, and pump performance should be explored to reveal the variation laws of internal flow and cavitation characteristics in PCP under different [Formula: see text]. In this study, a contrast analysis on external characteristics (e.g. volume efficiency) of pump with different eccentricity ratios was carried out by combining an RNG [Formula: see text] turbulence model based on Singhal full-cavitation model and the model pump test method. Moreover, gas volume distribution of PCP was analyzed and the optimal value range of eccentricity ratio was proposed. Results demonstrate that the axial force and axial power of PCP basically remain the same, volume efficiency increases, and cavitation performance decreases with the increase of [Formula: see text], and the optimal value for [Formula: see text] ranges from 0.17 to 0.24. In addition, a revised NPSHQ is proposed to quantify the cavitation characteristics of PCP.

Critical Value-Based Power Options Pricing Problems in Uncertain Financial Markets

2021 ◽  
pp. 2150002
Author(s):  
Guimin Yang ◽  
Yuanguo Zhu
Keyword(s):  
Financial Markets ◽  
Financial Market ◽  
Numerical Experiments ◽  
Critical Value ◽  
The Other ◽  
Options Pricing ◽  
Underlying Asset ◽  
Pricing Problems ◽  
Fractional Differential ◽  
The One

Compared with investing an ordinary options, investing the power options may possibly yield greater returns. On the one hand, the power option is the best choice for those who want to maximize the leverage of the underlying market movements. On the other hand, power options can also prevent the financial market changes caused by the sharp fluctuations of the underlying assets. In this paper, we investigate the power option pricing problem in which the price of the underlying asset follows the Ornstein–Uhlenbeck type of model involving an uncertain fractional differential equation. Based on critical value criterion, the pricing formulas of European power options are derived. Finally, some numerical experiments are performed to illustrate the results.

scholarly journals Evoluzione metodologica dell’invalidità civile in Italia: confronto ragionato tra i sistemi valutativi tabellari, di legge e non, che si sono succeduti negli anni

2019 ◽  
Vol 13 (1) ◽  
Author(s):  
Michele Sammicheli ◽  
Marcella Scaglione
Keyword(s):  
Disability Evaluation ◽  
Heart Diseases ◽  
Organ Damage ◽  
Working Capacity ◽  
Systematic Classification ◽  
Value Range ◽  
The One ◽  
Legal Judgments ◽  
Functional Indices ◽  
Ministerial Decree

The authors describe the evolution from 1980 to the present of the tables that describe invalidating states, on which the medical-legal judgments of civil disability in Italy are based.The first part of the work briefly describes the main disabilities, grouped by both body system and percentage value range, that can be found in the tables attached to the main documents applied, or applicable, to the sector: those issued alongside the Ministerial Decree n. 282 of 1980, those that accompanied the Ministerial Decree of February 1982 (still in force today) and those proposed by the Italian Institute of Social Security (INPS) in 2012, which have not yet entered into force.The second part of the paper has two aims. On the one hand, it seeks to underline the change in the pre-eminent type of disability featured in the tables: from osteoarticular diseases, which were the most significant type in the 1980 tables, to neoplastic diseases, which are the most prevalent overall in the 2012 tables.On the other hand, the authors highlight that the tables themselves have evolved, moving towards a more precise definition (both clinical and instrumental) of the organ damage causing the reduction in general working capacity. In the 1980 tables, disability was often evaluated empirically rather than based on the use of functional indices or systematic classification. In the 2012 INPS proposed tables, evaluations of the reduction in working capacity are often based on specific functional parameters for the various organs (EF for the heart, FEV1 for the respiratory system, GFR for the urinary system) or on standardized disability evaluation scales (NYHA classes for heart diseases, EDSS or the Hoehn & Yahr classification for neurological disorders, MMSE or CDR for dementia, the Child-Pugh classification for cirrhogenic hepatopathies).

A Note on Hidden Transient Chaos in the Lorenz System

2017 ◽  
Vol 18 (5) ◽  
pp. 427-434 ◽  
Author(s):  
Quan Yuan ◽  
Fang-Yan Yang ◽  
Lei Wang
Keyword(s):  
Rayleigh Number ◽  
Lorenz System ◽  
Critical Value ◽  
Transient Chaos ◽  
Topological Horseshoe ◽  
One Dimensional ◽  
Dynamical Behaviors ◽  
The Lorenz System ◽  
The One

AbstractIn this paper, the classic Lorenz system is revisited. Some dynamical behaviors are shown with the Rayleigh number $\rho $ somewhat smaller than the critical value 24.06 by studying the basins characterization of attraction of attractors and tracing the one-dimensional unstable manifold of the origin, indicating some interesting clues for detecting the existence of hidden transient chaos. In addition, horseshoes chaos is verified in the famous system for some parameters corresponding to the hidden transient chaos by the topological horseshoe theory.

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