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1
Content available Sustainable soil stabilization using combination of geotextile, fly-ash and saw dust for pavement subgrade
Sahak A., Singh M., Adhikari A., Hussain S.
Archives of Materials Science and Engineering
|
2021
|
Vol. 109, nr 1
17--28
EN
Purpose: This paper investigates the combined effect of fly ash, sawdust and geotextile in stabilizing the soil. Design/methodology/approach: A thorough geotechnical testing was carried out in order to study the potent characteristics of soil and soil mixes. The present investigation was set up in two stages. In the first stage, effects of fly ash (5, 10, 15 and 20%), sawdust (2.5, 5 and 7.5%) and layers of geotextile placed at different depths were studied separately to determine their effect on soil stabilization. In the second stage, fly ash, sawdust and geotextile were mixed with soil sample in order to obtain the optimum dosage which can be used for stabilization of soil i.e. their combined effect as stabilizer on soil stabilization. Findings: It was observed that by introducing fly ash, sawdust and geotextile to the soil, the CBR values increase and thickness of pavement layer decreases. It also decreases the amount of stress on subgrade leading to enhancement of pavement stability with cost effectiveness. Research limitations/implications: Economical use of industrial waste has been proposed in the present research which otherwise prove to be a malady to climatic change and human health. From the study, an optimum dosage of fly ash (2.5%) and saw dust (5%) and depth for geotextile (6 cm) has been proposed. Originality/value: The article explores the possibility of a ternary blend, i.e., geotextile, fly-ash and saw dust on effectively stabilizing pavement subgrade. Limited literature was available to address the issue of utilizing the industrial wastes that otherwise pose disposal issues.
2
Content available A study on alkali resistant glass fibre concrete and its exposure to elevated temperatures
Hussain S., Yadav J. S.
Journal of Achievements in Materials and Manufacturing Engineering
|
2020
|
Vol. 103, nr 1
5--15
EN
Purpose: Cement concrete is characterized as brittle in nature, the loading capacity of which is completely lost once failure is initiated. This characteristic, which limits the application of the material, can in one way be overcome by the addition of some small amount of short randomly distributed fibers (steel, glass, synthetic). Design/methodology/approach: The present study deals with the inclusion of alkali resistant glass fibers in concrete by percentage weight of cement. The mechanical properties such as compressive strength and split tensile strength have been studied after exposing the concrete samples to elevated temperatures of up to 500°C. Water binder ratios of 0.4, 0.45, 0.5, 0.55 and 0.6 have been used to prepare design mix proportions of concrete to achieve a characteristic strength of 30 MPa. The depth of carbonation post elevated temperature exposure has been measured by subjecting the concrete samples to an accelerated carbonation (5%) condition in a controlled chamber. Findings: Conclusions have been drawn in accordance to the effect of fiber replacement and temperature increment. The concrete mixes with fiber content of 1% by weight of cement had shown better strength in compression and tension compared to the other dosages and conventional concrete (without fiber). Microcracking due to internal stream pressure reduced the mechanical strengths of concrete at elevated temperatures. Also, from TGA it was observed that the amount of calcium carbonate in samples with fiber added, post carbonation was less than the mixes without fiber in it. Research limitations/implications: The present study has been limited to alkali resistant glass fibers as the conventional glass fibers undergo corrosion due to hydration. Practical implications: The glass fiber reinforced concrete can be used in the building renovation works, water and drainage works, b ridge and tunnel lining panels etc. Originality/value: Based upon the available literature, very seldom the studies are addressing the behaviour of alkali resistant glass fiber concrete and its exposure to elevated temperatures.
3
Content available remote Optical investigations of microwave induced synthesis of zinc oxide thin-film
Ansari A. R., Hussain S., Imran M., Al-Ghamdi A. A., Chandan M. R.
Materials Science Poland
|
2018
|
Vol. 36, No. 2
304--309
EN
In this article, ZnO thin-film deposition on a glass substrate was done using microwave induced oxygen plasma based CVD system. The prepared thin-films were tested in terms of crystallinity and optical properties by varying the microwave power. The effect of power variation on the morphology and size of final products was carefully investigated. The crystal structure, chemical composition and morphology of the final products were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Vis spectroscopy, Raman spectroscopy and photoluminescence (PL). This technique confirmed the presence of hexagonal ZnO nanocrystals in all the thin-films. The minimum crystallite grain size as obtained from the XRD measurements was ~9.7 nm and the average diameter was ~18 nm.
4
Content available Entropy generation and squeezing flow past a Riga plate with Cattaneo-Christov heat flux
Atlas M., Hussain S., Sagheer M.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2018
|
Vol. 66, nr 3
291--300
EN
In this article, we investigate the convective heat transfer of the two-dimensional unsteady squeezing flow past a Riga plate. To examine the heat transfer, Cattaneo-Christov heat flux model is used. Influence of entropy generation on heat transfer has been investigated numerically. With the help of suitable similarity transformation, the governing partial differential equations (PDEs) are converted into ordinary differential equations (ODEs). The obtained system of non-linear ordinary differential equations subject to the convective boundary conditions is solved by the shooting method using the computational software MATLAB. To strengthen the reliability of the results obtained by the shooting method, the MATLAB built-in function bvp4c has been used. The graphs show the effect of different physical parameters for velocity, temperature, concentration and tables are presented to observe the behaviour of skin friction and sherwood number under the influence of certain physical parameters. It is observed that for increasing values of thermal relaxation parameter, the temperature profile increases and an opposite behaviour is shown for the concentration profile. Moreover, with an increase in the Brinkman number, the entropy generation increases.
5
Content available remote On Hermite-Hadamard type inequalities for functions whose first derivative absolute values are convex and concave
Qaisar S., Hussain S.
Fasciculi Mathematici
|
2017
|
Nr 58
155--166
EN
In this paper, we derive general integral identity by establishing new Hermite-Hadamard type inequalities for functions whose absolute values of derivatives are convex and concave. Corresponding error estimates for midpoint formula are also included. Moreover, some applications to special means of real numbers are also provided.
6
Content available Boundary layer flow of magneto-micropolar nanofluid flow with Hall and ion-slip effects using variable thermal diffusivity
Bilal M., Hussain S., Sagheer M.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2017
|
Vol. 65, nr 3
383--390
EN
In the present article, magneto-micropolar nanofluid flow with suction or injection in a porous medium over a stretching sheet for the heat and mass transfer is analyzed numerically. Both Hall and ion-slip effects are considered along with variable thermal diffusivity. The governing partial differential equations are transformed to ordinary differential equations using usual similarity transformations. These coupled non-linear differential equations are solved using the shooting method. Effects of prominent parameter on velocities, temperature and concentration are discussed graphically. Numerical values of skin-friction coefficient, local Nusselt number and local Sherwood number are also tabulated and discussed.
7
Content available Effect of operating parameters on production of bio-oil from fast pyrolysis of maize stalk in bubbling fluidized bed reactor
Ali N., Saleem M., Shahzad K., Hussain S., Chughtai A.
Polish Journal of Chemical Technology
|
2016
|
Vol. 18, nr 3
88--96
EN
The yield and composition of pyrolysis products depend on the characteristics of feed stock and process operating parameters. Effect of particle size, reaction temperature and carrier gas flow rate on the yield of bio-oil from fast pyrolysis of Pakistani maize stalk was investigated. Pyrolysis experiments were performed at temperature range of 360-540°C, feed particle size of 1-2 mm and carrier gas flow rate of 7.0-13.0 m3/h (0.61.1 m/s superficial velocity). Bio-oil yield increased with the increase of temperature followed by a decreasing trend. The maximum yield of bio-oil obtained was 42 wt% at a temperature of 490°C with the particle size of around 1.0 mm and carrier gas flow rate of 11.0 m3/h (0.9 m/s superficial velocity). High temperatures resulted in the higher ratios of char and non-condensable gas.
8
Content available Unsteady laminar mixed convection boundary layer flow near a vertical wedge due to oscillations in the free-stream and surface temperature
Roy N. C., Hossain A., Hussain S.
International Journal of Applied Mechanics and Engineering
|
2016
|
Vol. 21, no. 1
169--186
EN
The unsteady laminar boundary layer characteristics of mixed convection flow past a vertical wedge have been investigated numerically. The free-stream velocity and surface temperature are assumed to be oscillating in the magnitude but not in the direction of the oncoming flow velocity. The governing equations have been solved by two distinct methods, namely, the straightforward finite difference method for the entire frequency range, and the extended series solution for low frequency range and the asymptotic series expansion method for high frequency range. The results demonstrate the effects of the Richardson number, Ri, introduced to quantify the influence of mixed convection and the Prandtl number, Pr, on the amplitudes and phase angles of the skin friction and heat transfer. In addition, the effects of these parameters are examined in terms of the transient skin friction and heat transfer.
9
Content available remote Some more properties of γ-s-closed spaces
Hussain S.
Fasciculi Mathematici
|
2015
|
Nr 54
118--124
EN
The concept of γ-s-closed spaces have been introduced and explored by S. Hussain and B. Ahmad [6]. In this paper, some more interesting characterizations have been constructed for the description of such spaces.
10
Content available remote Relationships between Average Depth and Number of Misclassifications for Decision Trees
Chikalov I., Hussain S., Moshkov M.
Fundamenta Informaticae
|
2014
|
Vol. 129, nr 1/2
15--26
EN
This paper presents a new tool for the study of relationships between the total path length or the average depth and the number of misclassifications for decision trees. In addition to algorithm, the paper also presents the results of experiments with datasets from UCI ML Repository [9] and datasets representing Boolean functions with 10 variables.
11
Content available remote Investigation of effects produced by chemical functionalization in single-walled and multi-walled carbon nanotubes using Raman spectroscopy
Hussain S, Shah K A, Islam S S
Materials Science Poland
|
2013
|
Vol. 31, No. 2
276--280
EN
Single-wall carbon nanotubes (SWNTs) as well as multi-wall carbon nanotubes (MWNTs) were characterized by Raman spectroscopy to observe the changes in their physical and structural properties on functionalization. When SWNTs or MWNTs are chemically treated, the defects are created. The analysis of radial breathing mode (RBM) showed that the diameter of the single wall carbon nanotubes changed after functionalization. In the carboxylated sample, the intensity of the disordered band (D-mode) increased more than in the pristine samples. The increase in the D-band intensity in SWNTs after functionalization can be attributed to carbon atoms excited from sp2 to sp3 hybridization. A higher intensity ratio in D-and G-mode (ID/IG) was observed after functionalization with carboxylic group (COOH). The intensity ratio ID/IG increased on acid treatment which was evident from the Raman spectra and their analysis. In case of MWNTs, the intensity of D band became equal to the intensity of G band, which was due to the huge number of defects that had been introduced in the sidewalls. Moreover, it was found in this study that the MWNTs can be much easier chemically functionalized than SWNTs under the same physical conditions.
12
Content available remote Properties of γ-semi-regular-open sets and γ-s-closed spaces
Hussain S., Rosas E.
Fasciculi Mathematici
|
2013
|
Nr 50
67--76
EN
The concept of γ-semi-regular-open sets and γ-s- closed spaces have been introduced and explored in [6]. In this paper, we continue studying the properties and characterizations of y-semi-regular open sets and γ-s-closed spaces.
13
Content available remote On locally γ-s-closed spaces
Hussain S., Ahmad B.
Fasciculi Mathematici
|
2013
|
Nr 51
93--103
EN
In this paper, we aim to continue studying the properties of γ-s-closed spaces introduced and discussed in [5] and [9]. The concept of locally γ-s-closed space have been introduced. Certain important characterizations and properties of locally γ-s-closed space have also been established.
14
Content available remote Applications of minimal γ-semi-open sets
Hussain S.
Fasciculi Mathematici
|
2011
|
Nr 46
65--76
EN
In this paper, minimal y-semi-open sets in topological spaces introduce and discuss. Also some properties of pre y-semi-open sets using properties of minimal y-semi-open sets obtain. As an application of a theory of minimal y-semi-open sets. I obtain a suffcient condition for a y-semi-locally nite space to be a pre y-semi-T2 space.
15
Content available remote Some inequalities of Aczel type for Gramians in n-inner product spaces
Rafiq A., Mir N., Hussain S.
Demonstratio Mathematica
|
2007
|
Vol. 40, nr 3
609-629
EN
Some inequalities of Aczel type for Gramians in n-inner product spaces which generalize pecaric result for n-inner product spaces are given. Applications connected to Schwartz’s inequality for n-inner product spaces are also noted.
16
Recursterols A and B, Chymotrypsin Inhibiting Sterols from Haloxylon recurvum
Hussain S., Ahmed E., Malik A., Ferheen S., Jabbar A., Ashraf M., Lodhi M., Choudhary M.
Polish Journal of Chemistry
|
2006
|
Vol. 80, nr 3
409-415
EN
Recursterols A(1) and B (2), the new C-24 alkylated sterols, have been isolated from the chloroform-soluble fraction of Haloxylon recurvum. Their structures have been deduced through spectroscopic techniques including 2D NMR. Both 1 and 2 showed promising inhibitory potential against the enzyme chymotrypsin.
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