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Search Results: 1 - 10 of 668 matches for " Naveed Anjum "
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Influence of Water Ageing on Mechanical Properties of CaCO3 Filler Filled Epoxy Resin and Sansevieria/Carbon Fiber Reinforced Composites  [PDF]
Naveed Anjum, Bheemappa Suresha, Somanahally Lingaiah Ajit Prasad
Open Journal of Composite Materials (OJCM) , 2019, DOI: 10.4236/ojcm.2019.91001
Abstract:
The present paper studies water absorption behavior and its consequence on mechanical properties of untreated and chemically treated Sansevieria /carbon fiber reinforced hybrid epoxy (Sria/CF-Ep) composite with calcium carbonate (CaCO3) nanoparticles. Sansevieria /carbon fiber (30/5 wt%) reinforced hybrid epoxy composite with 1.5, 3 and 4.5 wt% of CaCO3 have been developed by hand lay-up method followed by heat press. The water absorption characteristics of the Sria fibers were obtained by immersing the composite samples in sea water at room temperature, until reaching their water content saturation level. The dry and water-immersed hybrid composite samples were subjected to hardness, interlaminar shear, tensile, flexural, and impact tests. The water absorption development of hybrid composites was found to follow Fickian diffusion behavior. Diffusion coefficients and maximum water uptake results were evaluated; the outcome showed that both increased with an increase in filler loading to study the consequence of water penetration in the fiber/matrix interface. The study shows that the mechanical and water-resistant properties of the Sria were improved through chemical treatment and hybridization. Nevertheless, as a result of water penetrating the fiber/matrix interface, longer water-immersion times reduced the tensile and flexural strength of the composites.
Determination of the Impact of Working Capital Management on Profitability: An Empirical Study from the Cement Sector in Pakistan
Mobeen Ur Rehman,Naveed Anjum
Asian Economic and Financial Review , 2013,
Abstract: his paper examines the impact that the running assets management on the profitability of Pakistan cement sector. Moreover, the study outlines the main factors that basically determine the working capital in the financials of Pakistan cement sector. To manage firm’ sliquid assets which is working capital management and to reach a desire equilibrium level among profitability and risk, figures was collected from Annual Reports and sample consist of 10 Pakistani cement Companies listed at KSE from 2003-2008. The association between working capital management and profitability is examined with correlation; regression analysis the result proved that there is inverse and positive association between working capital management and profitability in cement industry of Pakistan.
Studies on Productivity and Performance of Spring Sugarcane Sown in Different Planting Configurations  [PDF]
  Samiullah,   Ehsanullah, Shakeel Ahmad Anjum, Mohsin Raza, Naveed Hussain, Mubashar Nadeem, Nawazish Ali
American Journal of Plant Sciences (AJPS) , 2015, DOI: 10.4236/ajps.2015.619293
Abstract: Row spacing has a pivotal role in enhancing sugarcane yield and improving its quality. A study was undertaken to evaluate the influence of different planting techniques on performance of sugarcane at Agronomic Research Area, Department of Agronomy, University of Agriculture Faisalabad during Kharif 2014. Experimental treatments comprised of: 180 cm spaced trenches with tripple row strips, 180 cm spaced trenches with alternate row strips, 120 cm spaced trenches with double row strips and 60 cm spaced furrows with single rows. Sugarcane cultivar HSF-240 was used as experimental material. The experimental was conducted in RCBD with four replications. The expeimental results revealed that sugarcane number of tillers, plant height, cane length, stripped cane weight and stripped cane yield increased progressively with the increase in row spacing from 60 to 180 cm. While germination percentage and number of millable canes were not affected by different sowing techniques, maximum number of tillers (15.96 m-2), plant height (333.25 cm), stripped cane weight (0.94 kg) and stripped cane yield (107 t·ha-1) were recorded from 180 cm spaced trenches with tripple row strips.
Evaluation and Performance of Reactive Protocols Using Mobility Model
Naveed Anjum Imran Shafi,Sohail Abidi
Computer Science , 2013,
Abstract: A Mobile Ad-hoc Network (MANET) is a self-motivated wireless network which has no centralized point. It is an independent network that is connected by wireless link so, in which every point or device work as a router. In this network every node forward the packets to the destination as a router and it's not operating as an ending point. In this network every node adjusts them self by on his way in any direction because they are independent and change their position regularly. There are exist three main types of routing protocols which are reactive, proactive and final is hybrid protocols. This whole work compares the performance of some reactive protocols which also known as on - demand protocols, which are DSR, AODV and the final is AOMDV. DSR and AODV are reactive protocols which connected the devices on the network when needed by a doorway. The AOMDV protocol was designed for ad hoc networks whenever any route or link fail and also maintain routes with sequence numbers to avoid looping.
Glacier Mass-Balance Variation in China during the Past Half Century  [PDF]
Yousif Elnour Yagoub, Zhongqin Li, Ahmed A. H. Siddig, Omer Said Musa, Muhammad Naveed Anjum
Journal of Geoscience and Environment Protection (GEP) , 2018, DOI: 10.4236/gep.2018.65004
Abstract:
The aim of this study is to investigate the impact of temperature trend on glacier-mass balance, snow density, snowmelt, snow depth and runoff by using observations of nine glacier stations that covered most of the China over the period of 1979-2013. Trend analysis showed an increasing trend of temperature on all of the selected stations. On an average, temperature was increasing at the rate of 0.46/10a. The increasing trend of temperature showed a negative relationship with annual glacier-mass balance on most of the stations and caused a decrease in annual balance. Results of Pearson’s correlation analysis showed a highly significant negative correlation between temperature and snow density (correlation coefficient (CC = -0.661 at 0.01 significance level). There was a significant positive correlation between temperature and snowmelt (CC = 0.532 at 0.01 significance level). There was a significant negative correlation between temperature and snow depth (correlation coefficient (CC = -0.342 at 0.05 significance level). Moreover, there was a significant positive correlation between temperature and runoff (CC = 0.586 at 0.01 significance level). Increasing trend of temperature caused an increasing trend of annual snowmelt and runoff anomaly% at the rate of 24.82/10a and 9.87/10a, respectively. On the other hand, a declining trend in annual snow density and snow depth anomaly% was found at a rate of -5.32/10a and -1.93/10a, respectively. We concluded that the snow density, snowmelt and runoff are significantly sensitive to temperature in China. This contribution has provided information for further understanding of glacier variation and its influencing factors.
Weed Control Practices and Varying Sowing Dates Effects on Seed Production of Pearl Millet (Pennisetum americanum L.) under Semi-Arid Environment  [PDF]
Naveed Arslan, Usman Zulfiqar, Muhammad Ishfaq, Muhammad Ahmad, Muhammad Nabeel Anwar, Azeem Ullah, Iqra Nazar, Asif Iqbal, Muhammad Zohaib Anjum
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.99143
Abstract: Peral millet being drought tolerant has substantial potential to contribute in food security ensuring the food, fodder and nutritional value in different Asian and African countries. Susceptibility to abiotic and biotic factors and low productivity are the main reasons for decreasing productivity and area of millets. In this context, evaluation of the effect of weed control practices and varying sowing dates on grain yield of kharif season grown pearl millet (Pennisetum americanum L.) was demonstrated at post graduate agriculture research station, University of Agriculture, Faisalabad during 2015. Forage pearl millet was sown at three different sowing dates i.e. mid-June, end of June and mid-July and four weed control practices viz. weedy check (no weeding), twice hoeing at 15 and 30 days after sowing (DAS), weed control using herbicides i.e. application of Atrazine (Awax 38 SC) @ 330 g a.i. ha-1 at 15 DAS, and twice foliar applications of 10% Sorghum water extract (Sorgaab) (at 15 and 30 DAS). The experiment was laid out in randomized complete block design (RCBD) under split plot arrangement, comprising of three replications. The treatments with varying sowing dates were randomized in main plots and weed control practices were in subplots. Results showed that the highest plant height (279.51 cm), leaf area (2777.80 cm2), fresh weight of leaves per plant (155.57 g), maximum number of grains per head (3162.0) and grain yield (3419.7
Role of Silicon Dioxide Filler on Mechanical and Dry Sliding Wear Behaviour of Glass-Epoxy Composites
Naveed Anjum,S. L. Ajit Prasad,B. Suresha
Advances in Tribology , 2013, DOI: 10.1155/2013/324952
Abstract: The mechanical properties and dry sliding wear behaviour of glass fabric reinforced epoxy (G-E) composite with varying weight percentage of silicon dioxide (SiO2) filler have been studied in the present work. The influence of sliding distance, velocity, and applied normal load on dry sliding wear behaviour has been considered using Taguchi's L9 orthogonal array. Addition of SiO2 increased the density, hardness, flexural, and impact strengths of G-E composite. Results of dry sliding wear tests showed increasing wear volume with increase in sliding distance, load, and sliding velocity for G-E and SiO2 filled G-E composites. Taguchi's results indicate that the sliding distance played a significant role followed by applied load, sliding velocity, and SiO2 loading. Scanning electron micrographs of the worn surfaces of composite samples at different test parameters show smooth surface, microploughing, and fine grooves under low load and velocity. However, severe damage of matrix with debonding and fiber breakage was seen at high load and velocity especially in unfilled G-E composite. 1. Introduction Present day industries are experiencing an escalating trend in the applications of particulate and fiber reinforced polymer matrix composites. Some of these applications related to mechanical engineering experience surface interactions with the surroundings as well as with the pairing element. Such applications call for better understanding of the tribological behaviour of the material under study. Functional fillers are added to the thermoset matrix for improving its physical, mechanical and tribological properties. The modification of the mechanical, and tribological behavior of various polymers by the addition of filler materials has shown a great promise, and hence, it has been a subject of considerable interest. The filler materials include organic, inorganic, and metallic particulates in both macro- and nanolevels. Inclusion of solid lubricants such as graphite, molybdenum disulphide (MoS2), and polytetrafluoroethylene (PTFE) into polymers has proven effective in reducing the coefficient of friction but their influence on wear resistance is not distinctly clear [1]. Wear rate was reduced with the addition of PTFE into polymers such as polyphenylene sulfide (PPS), polyvinylchloride (PVC), polyarylate (PA), polyoxymethylene (POM), and polyamide (PA) [2]. Bolvari et al. [3] reported that the PTFE filled PPS reduced the wear rate of polymer remarkably. The role of PTFE filler in modifying the tribological behavior of fiber-reinforced composites has been studied
Investigation of Climate and Land Use Policy Change Impacts on Food Security in Eastern Sudan, Gadarif State  [PDF]
Yousif Elnour Yagoub, Zhongqin Li, Omer Said Musa, Muhammad Naveed Anjum, Feiteng Wang, Zhang Bo
Journal of Geographic Information System (JGIS) , 2017, DOI: 10.4236/jgis.2017.95034
Abstract: The aims of this research were to investigate the impacts of climate variations on land use policies, food security and vegetation cover in Gadarif State (eastern Sudan) during 1961 to 2013. Analysis of precipitation and temperature time series revealed that the annual precipitation was decreasing while the temperature was increased in the study area. Precipitation was decreasing at a rate of 50.3 mm/10a, while the temperature was increasing at a rate of 0.02°C/10a. The result of both SPEI and SPI showed that the Gadarif State has been changed to a high frequency of drought during 1961-2013. Sorghum yield showed a significant positive relationship with precipitation during July and October (CC = 0.364 and 0.321, respectively), moreover, a significant positive relationship between Sesame yield and precipitation was observed during July (CC = 0.335). A significant negative relationship between Sorghum yield and mean temperature was observed during the rainy season (July to October) with CC = 0.278. The yield productivity of Sorghum and Sesame had decreased significantly (from more than 800 kg/ha in the 1960s to less than 200 kg/ha in 2000s for Sorghum, while 500 kg/ha in 1960s to 100 kg/ha in 2000s for Sesame). The Mechanized Rain-fed Agriculture (MRA) area of Sorghum and Sesame in the Gadarif State had been increased from 1,058,241 ha to 2,799,655 ha during 1961 to 2013. Thus, we ultimately suggest that in the Gadarif State, policy makers must strive for an increase in yield per unit area by using sufficient fertilizers along with the gradual increment in tendencies of grain production through expansion of the cultivated area.
Statistical Multiplexing of Homogeneous Streams results in Linear Bandwidth Gains  [PDF]
Bushra Anjum
Journal of Software Engineering and Applications (JSEA) , 2012, DOI: 10.4236/jsea.2012.512B001
Abstract: Statistical multiplexing of traffic streams results in reduced network bandwidth requirement. The resulting gain increases with the increase in the number of streams being multiplexed together. However, the exact shape of the gain curve, as more and more streams are multiplexed together, is not known.

In this paper, we first present the generalized result that the statistical gain of combining homogeneous traffic streams, of any traffic type, is a linear function of the number of streams being multiplexed. That is, given a fixed Quality of Service (QoS) constraint, like percentile delay, D, the bandwidth requirement of n streams to satisfy the delay constraint D is n x R x c where R is the bandwidth requirement of a single stream that satisfies the constraint D and c e (0,1]. We present the linear bandwidth gain result, using an extensive simulation study for video traces, specifically, streaming video (IPTV traces) and interactive video (CISCO Telepresence traces).

The linear bandwidth gain result is then verified using analytical tools from two different domains. First, we validate the linearity using Queueing Theory Analysis, specifically using Interrupted Poisson Process (IPP) and Markov Modulated Poisson Process (MMPP) modeling. Second, we formally prove the linear behavior using the Asymptotic Analysis of Algorithms, specifically, the Big-O analysis.

In-Vivo Models for Management of Pain  [PDF]
Naveed Muhammad
Pharmacology & Pharmacy (PP) , 2014, DOI: 10.4236/pp.2014.51014
Abstract:

Natural products are mostly considered safe, effective and with fewer side effects. For testing the natural products for their analgesic potential various in-vivo methods are used including chemical induced methods and thermal induced method. In the present review article we have discussed various in-vivo paradigms along with their merits and drawbacks. This mini review will help pharmacologist in performing various analgesic experiments.

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