On the relationship between turbulent motion and bimodal size distribution of suspended flocs

A more detailed occurrence features of organic matters in the printing and dyeing wastewater, based on its particle size distribution (PSD) and along with a wastewater treatment process, was conducted to provide a support for advanced treatment. Results suggested that, (1) In the dyeing wastewater, the occurrence characteristic of COD was: soluble>supra colloidal>colloidal>settleable; However, for protein, the supra colloidal was dominant, followed by the soluble. The feature of the polysaccharide was consistent with COD’s. In the wastewater, 29.66% of COD could be attributed to proteins and 3.45% of the COD could be attributed to polysaccharides. (2) The relationship among the forms of COD in the primary sedimentation tank, aerobic tank, secondary sedimentation tank, and reverse osmosis-treated concentrated effluent was consistent, that was: soluble>colloidal>supra colloidal>settleable. (3) In the primary sedimentation tank, the settleable COD was almost completely removed; In the aerobic tank, the residual super colloidal COD was not much; After MBR-RO treatment, the COD in the reverse osmosis concentrated water was almost dissolved and only a little presented in other forms.

Download Full-text

Experimental-numerical studies of the effect of cell structure on the mechanical properties of polypropylene foams

e-Polymers ◽

10.1515/epoly-2020-0060 ◽

2020 ◽

Vol 20 (1) ◽

pp. 713-723

Author(s):

Wei Gong ◽

Tuan-Hui Jiang ◽

Xiang-Bu Zeng ◽

Li He ◽

Chun Zhang

Keyword(s):

Mechanical Properties ◽

Size Distribution ◽

Cell Size ◽

Cell Structure ◽

Structure Parameters ◽

Cell Size Distribution ◽

Numerical Studies ◽

Polypropylene Foam ◽

The Impact ◽

The Relationship

AbstractThe effects of the cell size and distribution on the mechanical properties of polypropylene foam were simulated and analyzed by finite element modeling with ANSYS and supporting experiments. The results show that the reduced cell size and narrow size distribution have beneficial influences on both the tensile and impact strengths. Decreasing the cell size or narrowing the cell size distribution was more effective for increasing the impact strength than the tensile strength in the same case. The relationship between the mechanical properties and cell structure parameters has a good correlation with the theoretical model.

Download Full-text

Numerical Modeling of the Relationship Between Mechanical Properties of Granite and Microparameters of the Flat-Joint Model Considering Particle Size Distribution

Mathematical Geosciences ◽

10.1007/s11004-018-09780-7 ◽

2018 ◽

Vol 51 (3) ◽

pp. 319-336 ◽

Cited By ~ 1

Author(s):

Biao Shu ◽

Ming Liang ◽

Shaohe Zhang ◽

Jeffrey Dick

Keyword(s):

Mechanical Properties ◽

Particle Size ◽

Numerical Modeling ◽

Particle Size Distribution ◽

Size Distribution ◽

Joint Model ◽

The Relationship

Download Full-text

A note on the relationship between the quadratic mean stand diameter and harmonic mean basal area under size-biased distribution theory

Canadian Journal of Forest Research ◽

10.1139/x03-043 ◽

2003 ◽

Vol 33 (8) ◽

pp. 1587-1590 ◽

Cited By ~ 6

Author(s):

J H Gove

Keyword(s):

Size Distribution ◽

Graphical Representation ◽

Basal Area ◽

Distribution Theory ◽

Harmonic Mean ◽

Quadratic Mean ◽

Point Sampling ◽

The Relationship ◽

Horizontal Point Sampling ◽

Biased Distribution

This note seeks to extend the utility of size-biased distribution theory as applied to forestry through two relationships regarding the quadratic mean stand diameter. First, the quadratic mean stand diameter's relationship to the harmonic mean basal area for horizontal point sampling, which has been known algebraically from early on, is proved under size-biased distribution theory. Second, a new result, which may prove most valuable in viewing the graphical representation of assumed distributions, is also derived. The results are also shown to apply to the basal area size distribution, providing a unique duality between the two means.

Download Full-text

The Relationship between Matrix Grain Size Distribution and Permeability of Porous Media

10.3997/2214-4609.202011524 ◽

2020 ◽

Author(s):

R. Masumura ◽

H. Mikada ◽

J. Takekawa

Keyword(s):

Grain Size ◽

Porous Media ◽

Size Distribution ◽

Grain Size Distribution ◽

The Relationship

Download Full-text

Regional and Transported A erosols in Ambient A tmosphere of Raipur,India, during W inter

Journal of Ravishankar University (Part-B) ◽

10.52228/jrub.2017-30-1-2 ◽

2021 ◽

Vol 30 (1) ◽

pp. 7-17

Author(s):

Manas Kanti Deb ◽

Mithlesh Mahilang ◽

Jayant Nirmalkar

Keyword(s):

Size Distribution ◽

Long Range ◽

Fine Particles ◽

Characteristic Size ◽

Long Range Transport ◽

Bimodal Size Distribution ◽

Entire Study ◽

Coarse Mode ◽

Range Transport ◽

Air Trajectory

Size fractionated atmospheric aerosols were collected using cascade impactor sampler on quartz flter substrate during October 2015 to February 2016 in campus of Pt Ravishankar Shukla University of Raipur Chhattisgarh. The size of aerosol particles is of crucial importance to several processes in the atmosphere. The relative concentrations in both modes are responsible for the variability observed in the shape of the size distribution. Characteristic size distributions of measured aerosol over central India showed identifcation of three main behaviour types during entire study period: (i) month in which bimodal size distribution dominated in coarse mode (October 2015, 5 December 2015 and January, 2016), (ii) those months in which bimodal distribution equally intense in both one, and coarse modes (November, 2015) and (iii) those which were mainly dominated within fine (February, 2016, December, 2015). The two-subsequent month namely November 2015 and December 2015 shows bimodal size distribution with dominance in fine size range in comparison to coarse mode, possibly these high loading of one particles is due to long range transport. The peculiar observation of air trajectory shows that there is increase in fine particles concentration during December 2015, although there in increase in temperature and wind speed. The reason for this high concentration is long range transport of air masses. However, January has normal trend in particular matter concentration. The important finding of the present study based on characteristic size distribution and air trajectory plots accomplishes that fine particles are obtained through long range transport whereas coarse particles are mainly from local origin.

Download Full-text

Growth and Firm Size Distribution

Journal of Electronic Commerce in Organizations ◽

10.4018/jeco.2016040105 ◽

2016 ◽

Vol 14 (2) ◽

pp. 61-73

Author(s):

Wei Zhang ◽

Yan-Chun Zhu ◽

Jian-Bo Wen ◽

Yi-Jie Zhuang

Keyword(s):

Size Distribution ◽

Firm Size ◽

Zipf’S Law ◽

Growth Path ◽

Firm Size Distribution ◽

Zipf's Law ◽

Gibrat’S Law ◽

Gibrat's Law ◽

Quantile Regression Method ◽

The Relationship

Studies on the firm's size distribution (FSD) can set a good foundation to know about the growth path and mechanism of e-commerce firms. The purpose of this paper is to understand features of the China's listed e-commerce firms by testing Gibrat's law and Zipf's law within the Internet sectors. From a macroscopic perspective, with the approach of OLS estimation, Zipf's coefficient of the FSD is calculated to test whether Zipf's law holds. From a microscopic perspective, the relationship between e-commerce firm size and growth is explored by quantile regression method. The results indicate that from 2005 to 2014, Zipf's law cannot be rejected, with the relationship changing over time, Gibrat's law holds partly. It implies that competition status among China's e-commerce firms becomes more stable.

Download Full-text