Search results for: Nasrullah Khan

Items from 1 to 20 out of 20 results

article

Classification and ordination of understory vegetation using multivariate techniques in the Pinus wallichiana forests of Swat Valley, northern Pakistan

Inayat Ur Rahman, Nasrullah Khan, Kishwar Ali

The Science of Nature > 2017 > 104 > 3-4 > 1-10

An understory vegetation survey of the Pinus wallichiana-dominated temperate forests of Swat District was carried out to inspect the structure, composition and ecological associations of the forest vegetation. A quadrat method of sampling was used to record the floristic and phytosociological data necessary for the analysis using 300 quadrats of 10 × 10 m each. Some vegetation parameters viz. frequency...

article

Aging study of the powdered magnetite nanoparticles

Umar Saeed Khan, Abdur Rahim, Nasrullah Khan, Nawshad Muhammad, more

Materials Chemistry and Physics > 2017 > 189 > Complete > 86-89

Magnetite nanoparticles were produced via co-precipitation method and then stored at room temperature for 6 years in aerobic atmosphere. Variations in the inherent solid phase and solid interfacial properties of the prepared magnetite nanoparticles were investigated. For this purpose the fresh and aged samples were characterized using transmission electron microscopy, vibrating sample magnetometer,...

article

A mixed control chart adapted to the truncated life test based on the Weibull distribution

Nasrullah KHAN, Muhammad ASLAM, Kyung-Jun KIM, Chi-Hyuck JUN

Operations Research and Decisions > 2017 > 27 > 1 > 43-55

The design of a new mixed attribute control chart adapted to a truncated life test has been pre-sented. It was assumed that the lifetime of a product follows the Weibull distribution and the number of failures was observed using a truncated life test, where the test duration was specified as a fraction of the mean lifespan. The proposed control chart consists of two pairs of control limits based on...

article

A EWMA Control Chart for Exponential Distributed Quality Based on Moving Average Statistics

Nasrullah Khan, Muhammad Aslam, Chi‐Hyuck Jun

Quality and Reliability Engineering International > 32 > 3 > 1179 - 1190

We propose an exponentially weighted moving average (EWMA) control chart for monitoring exponential distributed quality characteristics. The proposed control chart first transforms the sample data to approximate normal variables, then calculates the moving average (MA) statistic for each subgroup, and finally constructs the EWMA statistic based on the current and the previous MA statistics. The upper...

article

Reducing maternal mortality in conflict areas: Surgical-anesthetic experience in Boost Hospital – Afghanistan

Gilda Izquierdo, Miguel Trelles, Nasrullah Khan

Colombian Journal of Anesthesiology > 2016 > 44 > 1 > 13-16

Helmand province, whose capital is Lashkar-Gah, is one of the most volatile provinces affected by the conflict in Afghanistan. Doctors without Borders began to work in Boost Hospital in 2009.Retrospective review of surgical procedures at the Doctors without Borders Operational Center in Brussels, February 11, 2010 to September 30, 2012.5719 surgeries were performed on 4334 patients. 47% were emergency...

article

Karakorum temperature out of phase with hemispheric trends for the past five centuries

Muhammad Usama Zafar, Moinuddin Ahmed, Mukund Palat Rao, Brendan M. Buckley, more

Climate Dynamics > 2016 > 46 > 5-6 > 1943-1952

A systematic increase in global temperature since the industrial revolution has been attributed to anthropogenic forcing. This increase has been especially evident over the Himalayas and Central Asia and is touted as a major contributing factor for glacier mass balance declines across much of this region. However, glaciers of Pakistan’s Karakorum region have shown no such decline during this time...

article

A control chart using belief information for a gamma distribution

Muhammad ASLAM, Nasrullah KHAN, Chi-Hyuck JUN

Operations Research and Decisions > 2016 > 26 > 4 > 5-19

The design of a control chart has been presented using a belief estimator by assuming that the quantitative characteristic of interest follows the gamma distribution. The authors present the structure of the proposed chart and derive the average run lengths for in-control and a shifted process. The average run lengths for various specified parameters have been reported. The efficiency of the proposed...

article

A control chart for an exponential distribution using multiple dependent state sampling

Muhammad Aslam, Muhammad Azam, Nasrullah Khan, Chi-Hyuck Jun

Quality & Quantity > 2015 > 49 > 2 > 455-462

In this paper, we will present a control chart for exponentially distributed quality characteristics using multiple dependent state sampling. The proposed control chart has double control limits with two control coefficients, which is based on a normal approximation through transformation. The control coefficients are determined by considering the average run length (ARL) when the process is in control...

article

Parametric Quantification of Low GWP Refrigerant for Thermosyphon Driven Solar Water Heating System

Naeem Abas, Rab Nawaz, Nasrullah Khan

Procedia Computer Science > 2015 > 52 > Complete > 804-811

Modern lifestyle, growing industrial and economy thrive on energy which is getting expensive over time. Natural convection based systems are getting attraction for their promising heat transfer efficiency and zero energy utilization. Refrigerants having ozone depletion potential (ODP) and high Global Warming Potential (GWP) have been banned or under time bared permission under the Montreal (1987)...

article

Designing of a new monitoring t-chart using repetitive sampling

Muhammad Aslam, Nasrullah Khan, Muhammad Azam, Chi-Hyuck Jun

Information Sciences > 2014 > 269 > Complete > 210-216

In this article, we propose a new t-chart for monitoring a process under the assumption that the time between events follows the exponential distribution. The proposed t-chart has double control limits that use repetitive sampling and determine its control constants. The in-control and the out-of-control average run lengths are derived and tabulated according to various process shifts. The proposed...

article

Phytosociology, structure and dynamics of Pinus roxburghii associations from Northern Pakistan

Nasrullah Khan, Kishwar Ali, Shahid Shaukat

Journal of Forestry Research > 2014 > 25 > 3 > 511-521

We investigated the phytosociology, structure and dynamics of Pinus roxburghii in 40 stands in northern areas of Pakistan by using cluster analysis (Ward’s agglomerative clustering) and ordination (Nonmetric Multidimensional Scaling). Cluster analysis revealed three major groups associated with specific environmental characteristics: (1) P. roxburghii (2) Pinus-Quercus baloot and (3) Pinus-Olea ferruginea...

article

Future of Abies pindrow in Swat district, northern Pakistan

Kishwar Ali, Habib Ahmad, Nasrullah Khan, Stephen Jury

Journal of Forestry Research > 2014 > 25 > 1 > 211-214

Swat district is a biodiversity hub of Pakistan. The plant species, especially trees, in the Swat District are exposed to extinction threat from global climate change. Maximum entropy (MaxEnt) modelling of species distribution, using HADCM3 A2a global climate change scenario, predicted a considerable change in the future distribution of Abies pindrow (Royle ex D.Don) Royle. AUC (area under the curve)...

article

Five centuries of Upper Indus River flow from tree rings

Edward R. Cook, Jonathan G. Palmer, Moinuddin Ahmed, Connie A. Woodhouse, more

Journal of Hydrology > 2013 > 486 > Complete > 365-375

Water wars are a prospect in coming years as nations struggle with the effects of climate change, growing water demand, and declining resources. The Indus River supplies water to the world’s largest contiguous irrigation system generating 90% of the food production in Pakistan as well as 13gigawatts of hydroelectricity. Because any gap between water supply and demand has major and far-reaching ramifications,...

article

Climatic signal in tree-ring chronologies of Cedrus deodara from Chitral Hindukush Range of Pakistan

Nasrullah Khan, Moinuddin Ahmed, Syed Shahid Shaukat

Geochronometria > 2013 > 40 > 3 > 195-207

Tree-rings are an important tool for the investigation of paleoclimatic records for regions or periods of time with no instrumental climatic data. However, the responses of different species and sites to various climatic parameters are unusual. In the present study, we developed tree-ring-width chronologies of Cedrus deodara from three different sites of Chitral Hindukush range of Pakistan. The study...

article

Vegetation-environment relationships in the forests of Chitral district Hindukush range of Pakistan

Nasrullah Khan, Syed Shahid Shaukat, Moinuddin Ahmed, Muhammad Faheem Siddiqui

Journal of Forestry Research > 2013 > 24 > 2 > 205-216

We investigated the composition of plant communities to quantify their relationships with environmental parameters in the Chitral Hindukush range of Pakistan. We sampled tree vegetation using the Point Centered Quarter (PCQ) method while understory vegetation was sampled in 1.5-m circular quadrats. Cedrus deodara is the national symbol of Pakistan and was dominant in the sampled communities. Because...

chapter

Identification of delay factors in C-130 aircraft overhaul and finding solutions through data analysis

Nasrullah Khan, Irfan Anjum Manarvi

2011 Aerospace Conference > 1 - 8

2011 IEEE Aerospace Conference

C-130 aircraft is one of the most reliable military cargo aircraft¹². Its reliability makes it more lucrative for military users all around the world. It forms the backbone for tactical and transportation operations. To keep the transport aircraft fly worthy, aviation industry follows a stringent scheduled inspection program. Amongst the various scheduled programs the most comprehensive and costly...

article

Structure, diversity, and regeneration potential of Monotheca buxifolia (Falc.) A. DC. dominated forests of Lower Dir District, Pakistan

Nasrullah Khan, Moinuddin Ahmed, Syed Shahid Shaukat, Muhammad Wahab, more

Frontiers of Agriculture in China > 2011 > 5 > 1 > 106-121

This study reports on the multivariate analysis of the vegetation of Hindukush Range in Pakistan, concentrating on the structure and regeneration potential of Monotheca buxifolia and associated tree species. Twenty stands at different locations in the Dir District of the Hindukush Range in Pakistan were chosen for the study. A point centered quarter method for trees and 5m × 5m size quadrats were...

article

The dendroclimatic potential of conifers from northern Pakistan

Moinuddin Ahmed, Jonathan Palmer, Nasrullah Khan, Muhammad Wahab, more

Dendrochronologia > 2011 > 29 > 2 > 77-88

A collection of 28 tree-ring chronologies from six different species located in northern Pakistan were evaluated in terms of their potential for dendroclimatic reconstructions. 15 of the sites are new while the remaining 13 (all Juniperus excelsa M. Bieb.) have been reported earlier. Several species had trees attaining ages of around 700 years (Cedrus deodara (D. Don) G. Don, Pinus gerardiana Wall...

article

Modeling of a two-phase countercurrent pulsed sieve plate extraction column—A hybrid CFD and radiotracer RTD analysis approach

Ghiyas Ud Din, Imran Rafiq Chughtai, Mansoor Hameed Inayat, Iqbal Hussain Khan, more

Separation and Purification Technology > 2010 > 73 > 2 > 302-309

A Computational Fluid Dynamics (CFD) based model of a two-phase countercurrent pulsed sieve plate extraction column has been developed. Euler–Euler multiphase flow model and standard k–ɛ turbulence model for multiphase flow were used. Sieve plates in the column were modeled using the porous media formulation. The coefficients of porous media were evaluated using radiotracer RTD analysis data. A pulse...

article

Triple overwritten Bragg gratings based multiwavelength distributed feedback dye laser

Nasrullah Khan

Journal of Luminescence > 2004 > 106 > 3-4 > 321-327

Emission of multiple laser lines spectra due to three overwritten dynamic Bragg gratings in solution of Rhodamine 6G in ethanol is reported. The overlaid gratings were produced on dye solution by interference patterns of three pairs of frequency doubled Nd:YAG laser. Convolution of three dynamic overwritten gratings with different periodicities gave rise to generation of nine gratings of different...

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