scholarly journals Study on Hydrodynamics Model of Total Tailings Filling Slurry Dehydration

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Aiqing Zhang ◽  
Jinyun Li ◽  
Yiming Wang
Keyword(s):  
Fine Particles ◽  
Hydrodynamic Force ◽  
Control Variable ◽  
Branch Pipe ◽  
Variable Method ◽  
Test Results ◽  
Unclassified Tailings ◽  
Experimental Values ◽  
Full Height ◽  
Dehydration Effect

In order to ensure the dehydration effect of the whole tailings backfill, a dehydration model of the whole tailings backfill was established based on hydrodynamics on the basis of satisfying certain assumptions, and the theoretical solution was carried out. The control variable method is used to study the variation of dewatering capacity with dewatering depth and radius, and the applicability of the dewatering model is verified by experiments. The results show that the dewatering capacity increases with the increase of dewatering radius and decreases with the increase of dewatering depth by a quadratic polynomial. By comparing the experimental values with the theoretical ones, it is found that the variation law of the dewatering capacity with radius is the same and increases with the increase of dewatering depth. The reason is that the content of fine particles in the unclassified tailings is large and the filter hole on the branch pipe is blocked under the action of the hydrodynamic force. Therefore, the dewatering effect of the new root-like dehydration tube can be guaranteed by using the branch pipe arranged at the full height of main dewatering pipe. The dehydration model is modified by the test results to ensure the applicability.

scholarly journals Seismic Behavior and Force-Displacement Characterization of Neotype Column-Slab High Piers

2014 ◽  
Vol 2014 ◽  
pp. 1-10
Author(s):  
YanQun Zhou ◽  
YeZhi Zhang ◽  
MeiXin Ye ◽  
MengSi Zhan
Keyword(s):  
Seismic Behavior ◽  
Large Scale ◽  
Scale Model ◽  
Test Results ◽  
Lateral Displacements ◽  
High Pier ◽  
Experimental Values ◽  
Large Scale Tests ◽  
Force Displacement

The seismic behavior and plasticity spreading of a neotype column-slab high pier are researched in this paper. Four scale model tests of a web slab with two boundary columns are carried out under cyclic inelastic lateral displacements simulating seismic response. The test results show that the neotype column-slab high pier has strong and stable bearing capacity, good ductility, and energy dissipation capacity. The experimental values pertaining to the spread of plasticity are derived. An approach for deriving the spread of plasticity analytically is deduced and applied to the four tests. This method accurately assesses a pier’s spread of plasticity for most ductility levels. At nearly all ductility levels, the mean difference between analytical assessments of the spread of plasticity and results from 4 large-scale tests is 12% with a 9% coefficient of variation.

The Calibration of Thermocouples by Freezing-Point Baths and Empirical Equations

1959 ◽  
Vol 81 (2) ◽  
pp. 177-188 ◽  
Author(s):  
R. P. Benedict
Keyword(s):  
Digital Computer ◽  
High Speed ◽  
Freezing Point ◽  
Individual Characteristics ◽  
Empirical Equations ◽  
Test Results ◽  
Calibration System ◽  
Temperature Range ◽  
Experimental Values ◽  
The Individual

A calibration system is described which is based on the use of a few precisely determined experimental values obtained from freezing-point baths. Characteristics of the individual thermocouples at intermediate points are obtained by passing empirical equations of prescribed form through the test values. A program is reviewed, by which a high-speed digital computer accomplishes the necessary conversions, curve fittings, comparisons of individual characteristics with arbitrary reference tables, and the printing out of a table of differences. Test results for a series of iron-constantan thermocouples, over the temperature range 32–1225 F, are presented to illustrate the use of the system and the uncertainties involved. Comparisons are drawn between these results and those obtained by other methods.

Experimental investigation on the bending and buckling behavior of bio-based core innovative sandwich panels

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Abdelmadjid Si Salem ◽  
Fatma Taouche-Kkheloui ◽  
Kamal Ait Tahar
Keyword(s):  
Experimental Investigation ◽  
Failure Modes ◽  
Raw Materials ◽  
Sandwich Panels ◽  
Test Results ◽  
Content Type ◽  
Reinforced Polymer ◽  
Buckling Behavior ◽  
Experimental Values ◽  
Original Information

PurposeThe present study aims to experimentally investigate the flexural and buckling performances of novel sandwich panels manufactured with sawdust-based modified mortar core and both polypropylene and reinforced polymer plates as skins.Design/methodology/approachThe experimental investigation includes two main steps, characterization tests were firstly carried out in order to identify the laws behavior of the constitutive raw materials. The second one investigates 42 sandwich panels tested under three-points bending and buckling according to standard norms.FindingsThe emphasized test results in terms of bearing capacity; buckling strength, ductility, and failure mechanisms confirm that the overall and observed behavior of tested eco-friendly panels was in general satisfactory compared with experimental values reported in the literature. Indeed, the failure modes under bending and buckling conditions were summarized as shear/crimping failure of the sawdust-based mortar core without debonding of the core–skins interface.Originality/valueThe paper provides original information about the development of novel sandwich panels with a bio-based core and polymer skins for construction usage as interior partitioning walls.

scholarly journals Sensitivity Analysis of Factors Affecting Time-Dependent Slope Stability under Freeze-Thaw Cycles

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Zhiguo Chang ◽  
Qingxiang Cai ◽  
Li Ma ◽  
Liu Han
Keyword(s):  
Internal Friction ◽  
Slope Stability ◽  
Mass Density ◽  
Control Variable ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Open Pit ◽  
Test Results ◽  
Factors Affecting ◽  
Freeze Thaw

With open-pit mines excavated, the slopes will be exposed to the natural environment for a long time. Affected by factors like temperature, seepage, mining, freeze-thaw, etc., slope structural integrity and strength will gradually decline as slope exposure time extends. Besides, the development of defect structure within the rocks is closely correlated with time. In this paper, freeze-thaw cycle tests were conducted on the saturated sandstones collected from a certain open-pit mine. According to the test results, the mass density and longitudinal wave velocity gradually increased with more times of freeze-thaw cycles while mechanical properties such as internal friction angle, cohesion, elastic modulus, and uniaxial compressive strength decreased instead. The constitutive model of saturated rock deterioration was established by taking the volume of phase transition of water in microcracks as a variable. Based on the tests results and theoretical analysis, the sensitivity of the factors affecting slope stability under freeze-thaw damage was studied by Control Variable Method (CVM) and Orthogonal Design Method (ODM). It was determined that the internal friction angle and cohesion had a highly significant effect on the test results, while the mass density had a significant effect. The conclusions may play a certain role in guiding slope construction and protection.

Numerical Simulation on the Behaviors of Post-Embedded Bars in Reinforced Concrete

2012 ◽  
Vol 598 ◽  
pp. 454-458
Author(s):  
Jian Hua Yang
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Slip Model ◽  
Test Results ◽  
One Dimensional ◽  
Pull Out ◽  
Interface Slip ◽  
Experimental Values ◽  
Anchor Design ◽  
Good Agreement

Prism pull-out test results was used to build anchorage bonding interface slip model(ABISM), with this model, the behaviors of post-embedded bars in reinforced concrete with different anchorage depth were analyzed by one-dimensional numerical method, and the calculation values was compared with the experimental values. The results showed that: the calculated value is in good agreement with the experimental values. this model can provides an important reference for anchor design.

Test and Analysis on the Thermal Environment of Island Subway Platform in Frosty Area

2013 ◽  
Vol 353-356 ◽  
pp. 3025-3028
Author(s):  
Pei Hong Zhang ◽  
Lei Xin Yu ◽  
Jian Wang
Keyword(s):  
Wind Speed ◽  
Thermal Environment ◽  
Field Measurements ◽  
Maximum Wind Speed ◽  
Subway Station ◽  
Test Results ◽  
Maximum Wind ◽  
Average Temperature ◽  
Speed Up ◽  
Full Height

in order to study the piston wind and its effect on the thermal environment and velocity field in island subway station platform with full-height non-enclosed screen doors, a number of field measurements were taken at the platform of century station of metro line 2 in Shenyang from Oct. 2012 to Mar. 2013. The test results show that the full-height non-enclosed screen doors enhances the heat transfer between the platform and the tunnel, the effect of piston wind increases the average temperature of platform by 0.7°C-1.4°C. Meanwhile, the full-height non-enclosed screen doors prevent the piston wind from entering into the platform effectively. The wind speed of the platform fluctuates between 0.25~0.52m/s when no train enters or leaves the platform, increasing slightly under the effect of the outdoor wind velocity. When one-way train goes into and out of the site, the maximum wind speed reaches up to 2.2m/s at the working area of platform. While, the wind speed of the stair section shows cyclical shocks between 1.2m/s ~ 1.7m/s with the amplitude attenuates gradually.The two-way train caused the the maximum wind speed up to 2m/s with the duration of 220s.

Verification of Compressor Data Accuracy by Uncertainty Analysis and Testing Methods

1988 ◽  
Vol 110 (2) ◽  
pp. 265-269 ◽  
Author(s):  
N. D. Poti ◽  
D. C. Rabe
Keyword(s):  
Uncertainty Analysis ◽  
Spatial Variation ◽  
Air Force ◽  
Test Results ◽  
General Electric Company ◽  
Transonic Compressor ◽  
Air Force Base ◽  
Experimental Values ◽  
The Individual

A transonic compressor designed and instrumented by the General Electric Company was recently evaluated during several test programs in the Compressor Research Facility at Wright-Patterson Air Force Base. An analytical uncertainty analysis was performed for the individual measurements, as well as the calculated performance parameters. During the tests, the experimental values of precision uncertainty were compared to the analytical predictions. The spatial variation of the individual discharge measurements was evaluated for its effect on the uncertainty of the measured parameters and calculated performance. Through the comparison of the analytical and measured uncertainty and the evaluation of spatial variation, a final uncertainty of the measured performance is presented, and the overall quality of the test results is assessed. Through these data reviews, a more accurate understanding of the performance of the test compressor is obtained.

An Experimental Study on Basic Characteristics of a Magneto-Rheological Grease Damper

2015 ◽  
Author(s):  
Yusuke Sato ◽  
Hiroshi Sodeyama ◽  
Makoto Hayama ◽  
Shin Morishita
Keyword(s):  
Vibration Control ◽  
Dispersion Medium ◽  
Fine Particles ◽  
Active Vibration Control ◽  
Test Results ◽  
Active Vibration ◽  
Derived Design ◽  
Basic Characteristics ◽  
Fluid Dampers ◽  
Magneto Rheological

As one of the semi-active vibration control devices for mechanical or civil structures, magneto-rheological fluid dampers have been enthusiastically studied and developed since the 1990s. A new magneto-rheological material for such dampers has been developed to provide a practical solution to the significant common drawback of sedimentation of ferromagnetic fine particles in the fluid. Industrial grease is used as the dispersion medium in this material. The thickener to be added in the grease to control the rheological properties seems to prevent separation of the particles from the dispersion medium. Several performance tests were carried out with a proto-type of the damper with the newly developed magneto-rheological grease, namely, the magneto-rheological grease damper. Based on the test results, the energy dissipation capabilities of the damper and the basic characteristics of the magneto-rheological grease were verified to provide semi-active vibration control. Moreover, the analytically-derived design formulae for the damper were improved on the basis of the test results.

scholarly journals ASIMETRI INFORMASI MEMODERASI BEBAN PAJAK TANGGUHAN DAN MANAJEMEN LABA

2019 ◽  
Vol 5 (1) ◽  
pp. 41
Author(s):  
Sistya Rachmawati
Keyword(s):  
Multiple Regression ◽  
Significant Influence ◽  
Stock Exchange ◽  
Control Variable ◽  
Multiple Regression Model ◽  
Earning Management ◽  
Test Results ◽  
Manufacturing Companies ◽  
Asymmetry Information ◽  
Tax Expense

<strong><strong></strong></strong><em>The objective of this research is to ident6 the direct and indirect influences of deffered tax expense toward earning management which is moderated by asymmetry Information. This research examines </em>50 <em>manufacturing companies listed in Jakarta Stock Exchange and issues auditedfinancial statement since 2004-2006. The statistical method </em><em>used to test the hypothesis is Multiple Regression Model. The empirical result of this research indicates that deffered tax expense has influence to Earning Management. Test results suggest that by using the Multiple regression analysis, deffered tax expense have a direct positive significant influences to earning management, while asymmetry information have no significant influences toearning management. The control variable Cash Flow operation have positive significant influence toEarning Management, while size and growth has no significant influence Earning Management.</em><strong><strong></strong></strong>

scholarly journals Effect extract of Ipomoea pes-caprae leaf as anti-inflammatory non immunological in rat Rattus norvegicus

2019 ◽  
Vol 4 (1) ◽  
pp. 11-17
Author(s):  
Safrida Safrida ◽  
Hasanuddin Hasanuddin ◽  
Nurul A. Agusdinianti
Keyword(s):  
Diclofenac Sodium ◽  
Control Variable ◽  
Positive Control ◽  
Negative Control ◽  
Test Results ◽  
Anova Test ◽  
Drug Candidates ◽  
Randomized Design ◽  
Anti Inflammatory ◽  
One Way Anova

Ipomoea pes-caprae is one of the plants in Indonesia that has the potential as a traditional herbal medicine to treat inflammation. Hence, the objective of this study was to evaluate the effect of I. pes-capraeleaf extract as anti-inflammatory in edema rats induced by 5% egg white solution. The experimental design used was a Completely Randomized Design (CRD) consisted of 5 treatments, each consisted of 5 rats.The treatment consisted of KN = negative control, KP = positive control, giving  of 25 mg diclofenac sodium, K 100 = giving 100 mg kg-1body weight (BW) of I. pes-capraeleaf extract , K300 = 300 mg kg-1BW of I. pes-capraeleaf extract, and K500 = 500 mg kg-1BW of I. pes-capraeleaf extract. The anti-inflammatory data obtained were tested statistically with a one-way ANOVA test at  99% confidence level and followed by Duncan's test. The ANOVA test results showed that the giving ofI. pes-capraeleaf extract had a very significant effect (p 0.01) on the percentage of inflammatory, obtained Fcount Ftable, 21.46 4.79 at the level of α = 0.01. The treatment of I. pes-capraeleaf extract of 500 mg kg-1BW had the effect of decreasing the volume of edema with the positive control variable using diclofenac sodium 25 mg. It is concluded that I. pes-capraeleaf extract can be used as an anti-inflammatory by decreasing rat feet edema volume. I. pes-capraeleaf extract has a prospect for non-immunological inflammatory natural drug candidates.

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