A Visualization Based Analysis on Dynamic Bandwidth Allocation Algorithms for Optical Networks

Kamran Ali Memon,Khalid Husain Mohmadani,Saleemullah Memon,Muhammad Abbas,Noor ul Ain International Journal of Computer ScienceNetwork S 2023 International journal of computer science and netw Vol.23 No.8

Dynamic Bandwidth Allocation (DBA) methods in telecommunication network & systems have emerged with mechanisms for sharing limited resources in a rapidly growing number of users in today's access networks. Since the DBA research trends are incredibly fast-changing literature where almost every day new areas and terms continue to emerge. Co - citation analysis offers a significant support to researchers to distinguish intellectual bases and potentially leading edges of a specific field. We present the visualization based analysis for DBA algorithms in telecommunication field using mainstream co-citation analysis tool-CiteSpace and web of science (WoS) analysis. Research records for the period of decade (2009-2018) for this analysis are sought from WoS. The visualization results identify the most influential DBA algorithms research studies, journals, major countries, institutions, and researchers, and indicate the intellectual bases and focus entirely on DBA algorithms in the literature, offering guidance to interested researchers on more study of DBA algorithms.

Genetic Variability among Different Populations of Root Knot Nematodes Based on Their Encumbrance Response to Pasteuria Isolates Using PCR-RFLP

Kamran, Muhammad,Javed, Nazir,Ullah, Ihsan,Nazir, Shahid,Jamil, Shakra,Iqbal, Muhammad Zafar,Abbas, Huma,Khan, Sajid Aleem,Haq, Muhammad Ehetisham ul The Korean Society of Plant Pathology 2019 Plant Pathology Journal Vol.35 No.1

A great variable response was observed when PP-3 and PP-J encumbered with 116 populations of root knot nematode (RKN) at two different temperatures ($25{\pm}2^{\circ}C$ and $30{\pm}2^{\circ}C$) and concentrations ($10^4$ and $10^5$ spores/ml). The PCR reaction amplified intergenic region between cytochrome oxidase subunit II gene (COII) and large subunit of rRNA gene (lrRNA) of the mitochondrial genome of different RKN species. The primer C2F3 and 1108 identified M. incognita with the highest frequency (52.6%) followed by M. javanica (36.8%) and M. arenaria (10.5%). The sizes of PCR products were 1.7 kb for M. incognita and M. javanica populations while populations of M. arenaria produced 1.1 kb fragment. The digestion with Hinf I yielded three different fragment length patterns on 1.5 % agarose gel. From current research it is concluded that intra-Meloidogyne genetic variability exist in RKN populations which have better encumbrance with P. penetrans.

Genetic Variability among Different Populations of Root Knot Nematodes Based on Their Encumbrance Response to Pasteuria Isolates Using PCR-RFLP

Muhammad Kamran,Nazir Javed,Ihsan Ullah,Shahid Nazir,Shakra Jamil,Muhammad Zafar Iqbal,Huma Abbas,Sajid Aleem Khan,Muhammad Ehetisham ul Haq 한국식물병리학회 2019 Plant Pathology Journal Vol.35 No.1

A great variable response was observed when PP-3 and PP-J encumbered with 116 populations of root knot nematode (RKN) at two different temperatures (25 ± 2°C and 30 ± 2°C) and concentrations (104 and 105 spores/ml). The PCR reaction amplified intergenic region between cytochrome oxidase subunit II gene (COII) and large subunit of rRNA gene (lrRNA) of the mitochondrial genome of different RKN species. The primer C2F3 and 1108 identified M. incognita with the highest frequency (52.6%) followed by M. javanica (36.8%) and M. arenaria (10.5%). The sizes of PCR products were 1.7 kb for M. incognita and M. javanica populations while populations of M. arenaria produced 1.1 kb fragment. The digestion with Hinf I yielded three different fragment length patterns on 1.5 % agarose gel. From current research it is concluded that intra-Meloidogyne genetic variability exist in RKN populations which have better encumbrance with P. penetrans.

Geomechanical and thermal reservoir simulation during steam flooding

Roohollah Taghizadeh,Kamran Goshtasbi,Abbas Khaksar Manshad,Kaveh Ahangari 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.4

Steam flooding is widely used in heavy oil reservoir with coupling effects among the formation temperature change, fluid flow and solid deformation. The effective stress, porosity and permeability in this process can be affected by the multi-physical coupling of thermal, hydraulic and mechanical processes (THM), resulting in a complex interaction of geomechanical effects and multiphase flow in the porous media. Quantification of the state of deformation and stress in the reservoir is therefore essential for the correct prediction of reservoir efficiency and productivity. This paper presents a coupled fluid flow, thermal and geomechanical model employing a program (MATLAB interface code), which was developed to couple conventional reservoir (ECLIPSE) and geomechanical (ABAQUS) simulators for coupled THM processes in multiphase reservoir modeling. In each simulation cycle, time dependent reservoir pressure and temperature fields obtained from three dimensional compositional reservoir models were transferred into finite element reservoir geomechanical models in ABAQUS as multi-phase flow in deforming reservoirs cannot be performed within ABAQUS and new porosity and permeability are obtained using volumetric strains for the next analysis step. Finally, the proposed approach is illustrated on a complex coupled problem related to steam flooding in an oil reservoir. The reservoir coupled study showed that permeability and porosity increase during the injection scenario and increasing rate around injection wells exceed those of other similar comparable cases. Also, during injection, the uplift occurred very fast just above the injection wells resulting in plastic deformation.

Geomechanical assessment of reservoir and caprock in CO₂ storage: A coupled THM simulation

Taghizadeh, Roohollah,Goshtasbi, Kamran,Manshad, Abbas Khaksar,Ahangari, Kaveh Techno-Press 2019 Advances in energy research Vol.6 No.1

Anthropogenic greenhouse gas emissions are rising rapidly despite efforts to curb release of such gases. One long term potential solution to offset these destructive emissions is the capture and storage of carbon dioxide. Partially depleted hydrocarbon reservoirs are attractive targets for permanent carbon dioxide disposal due to proven storage capacity and seal integrity, existing infrastructure. Optimum well completion design in depleted reservoirs requires understanding of prominent geomechanics issues with regard to rock-fluid interaction effects. Geomechanics plays a crucial role in the selection, design and operation of a storage facility and can improve the engineering performance, maintain safety and minimize environmental impact. In this paper, an integrated geomechanics workflow to evaluate reservoir caprock integrity is presented. This method integrates a reservoir simulation that typically computes variation in the reservoir pressure and temperature with geomechanical simulation which calculates variation in stresses. Coupling between these simulation modules is performed iteratively which in each simulation cycle, time dependent reservoir pressure and temperature obtained from three dimensional compositional reservoir models in ECLIPSE were transferred into finite element reservoir geomechanical models in ABAQUS and new porosity and permeability are obtained using volumetric strains for the next analysis step. Finally, efficiency of this approach is demonstrated through a case study of oil production and subsequent carbon storage in an oil reservoir. The methodology and overall workflow presented in this paper are expected to assist engineers with geomechanical assessments for reservoir optimum production and gas injection design for both natural gas and carbon dioxide storage in depleted reservoirs.

Geomechanical and thermal reservoir simulation during steam flooding

Taghizadeh, Roohollah,Goshtasbi, Kamran,Manshad, Abbas Khaksar,Ahangari, Kaveh Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.4

Steam flooding is widely used in heavy oil reservoir with coupling effects among the formation temperature change, fluid flow and solid deformation. The effective stress, porosity and permeability in this process can be affected by the multi-physical coupling of thermal, hydraulic and mechanical processes (THM), resulting in a complex interaction of geomechanical effects and multiphase flow in the porous media. Quantification of the state of deformation and stress in the reservoir is therefore essential for the correct prediction of reservoir efficiency and productivity. This paper presents a coupled fluid flow, thermal and geomechanical model employing a program (MATLAB interface code), which was developed to couple conventional reservoir (ECLIPSE) and geomechanical (ABAQUS) simulators for coupled THM processes in multiphase reservoir modeling. In each simulation cycle, time dependent reservoir pressure and temperature fields obtained from three dimensional compositional reservoir models were transferred into finite element reservoir geomechanical models in ABAQUS as multi-phase flow in deforming reservoirs cannot be performed within ABAQUS and new porosity and permeability are obtained using volumetric strains for the next analysis step. Finally, the proposed approach is illustrated on a complex coupled problem related to steam flooding in an oil reservoir. The reservoir coupled study showed that permeability and porosity increase during the injection scenario and increasing rate around injection wells exceed those of other similar comparable cases. Also, during injection, the uplift occurred very fast just above the injection wells resulting in plastic deformation.

The relationship between maternal mental health and communication skills in children in Shiraz, Iran

Najmeh Maharlouei,Hossein Alibeigi,Abbas Rezaianzadeh,Pedram Keshavarz,Hadi Raeisi Shahraki,Hamid Nemati,Kamran B,Lankarani 한국역학회 2019 Epidemiology and Health Vol.41 No.-

OBJECTIVES: Child development is a significant issue in global public health, and maternal mental health (MMH) can have a remarkable effect on children’s development of communication skills. We aimed to investigate the association between MMH and communication skills in a sample of Iranian children. METHODS: This study was conducted in Shiraz, Iran during 2016. In total, 640 mothers who lived in Shiraz and were registered in the Fars Birth Cohort (FBC) study were invited to attend the FBC clinic with their children. A trained physician evaluated MMH using the General Health Questionnaire (GHQ). Additionally, a trained nurse assessed the children’s communication development status using the Ages and Stages Questionnaire for 60-month old children. RESULTS: The majority of the mothers were homemakers (82.8%) and had high school diplomas (38.9%). The mothers’ mean age was 33.7±4.6 years. Seventy-nine (12.3%) children had delayed communication skills, but no significant association was found between children’s communication skills and the mothers’ total GHQ score (p=0.43). In total, 493 mothers (77.0%) had abnormal somatic symptoms, 497 (77.7%) had abnormal anxiety/insomnia, 337 (52.7%) had social dysfunction, and 232 (36.3%) suffered from depression. Logistic regression indicated that after adjusting for confounders, the odds of delayed communication skills were 3-fold higher among the children of mothers with abnormal somatic symptoms than among other children (p=0.01). CONCLUSIONS: The study results confirmed that MMH had a significant impact on children’s communication skills. Moreover, maternal abnormal somatic symptoms exerted the strongest impact on the development of communication skills in 5-year-old children.

Chlorodifluoromethane (R22) Gas and Its Mixtures with CO2/N2/Air as an Alternative to SF6

Saleem Muhammad Zaheer,Kamran Muhammad,Amin Salman,Ullah Rahmat,Abbas Kharal Hafiz Shafqat,Nasimullah,Muhammad Fazal,Rahman Taqi ur 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.3

SF 6 has been extensively deployed in high voltage gas insulated equipment to be used as a dielectric medium since 1960 because of its excellent dielectric strength and arc interruption performance. This research proposes promising substitute of SF 6 , by investigating a refrigerant gas such as Chlorodifl uoromethane (CHClF 2 ) with a mixture of CO 2 /N 2 /Air to mitigate environmental hazards of SF 6 . R 22 has less atmospheric life and low cost as compared to SF 6 . It has less GWP (1,810) as compared to SF 6 (23,900). In this research, the AC and DC breakdown properties of R 22 mixtures along with varying ratios of CO 2 , N 2, and Air were investigated. The best alternative to SF 6 has been found to be a mixture of R 22 + N 2 which is close to 81% of SF 6 dielectric strength. The dielectric strength of diff erent optimal mixtures was found in the order of SF 6 > R 22 + N 2 > R 22 + Air > R 22 + CO 2 under AC voltage at 0.4 MPa. Moreover, the boiling point and GWP were further reduced by adding the buff er gases such as N 2, , CO 2 , and Air. R 22 also has acceptable insulation self-recoverability and liquefaction temperature. The results of this study are promising in terms of low cost and environment-friendly alternative to SF 6 .

Application of Regional Rainfall Frequency Analysis on Seven Sites of Sindh, Pakistan

Zamir Hussain,Mirza Naveed Shahzad,Kamran Abbas 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.5

The paper illustrates the results of regional frequency analysis of Annual Maximum Monthly Rainfall Totals (AMMRT) of seven sites of Sindh, Pakistan. The results of run test, lag-1 correlation coefficient and Mann-Whitney test have shown that the data series at given sites is random, having no serial correlation and identically distributed. The values of discordancy measure have shown that there is no discordant site in the group of seven sites. L-moments based heterogeneity measure (H) shows that the region composed of seven sites is homogeneous. The results of L-moment ratio diagram and ZDIST statistic have shown that the three distributions: GNO, PE3 and GPA are suitable candidates for regional distribution. To obtain the rainfall quantiles at ungauged sites of the study area, a linear regression model has been developed, between the mean of AMMRT of gauged sites and their respective site’s elevation. The quality of the regression estimates has been tested using formal tests related to the assumptions of Classical Linear Regression Modeling (CLRM). The results have shown that the fitted model has satisfied various assumptions related to the estimation of CLRM. Hence, the estimates of this study will be useful for the estimation of rainfall quantiles of the study area for various return periods and can be utilized for the preventive measures of flood disasters, agricultural water management and the proposed improvement projects for the rehabilitation and modernization of major barrages of Indus River in the Sindh Province.

Effect of external force on buckling of cytoskeleton intermediate filaments within viscoelastic media

Muhammad Taj,Muhammad Safeer,Muzamal Hussain,Muhammad N. Naeem,Manzoor Ahmad,Kamran Abbas,Abdul Q. Khan,Abdelouahed Tounsi 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.3

Cytoskeleton components in living cell bear large compressive force and are responsible in maintaining the cell shape. Actually these filaments are surrounded by viscoelastic media within the cell. This surrounding, viscoelastic media affects the buckling behavior of these filaments when external force is applied on these filaments by exerting continuous pressure in opposite directions to the incipient buckling of the filaments. In this article a mechanical model is applied to account the effects of this media on the buckling behavior of intermediate filaments network of cytoskeleton. The model immeasurably associates; filament’s bending rigidity, adjacent system elasticity, and cytosol viscosity with buckling wavelength, buckling growth rate and buckling amplitude of the filaments.