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Search Results: 1 - 10 of 330 matches for " Yawar Nisar "
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Isolated Blunt Traumatic Diaphragmatic Rupture in a Case of Situs Inversus  [PDF]
Raiees Ahmad, Malik Suhail, Alfer Nafae, Qayoom Khan, Pervaze Salam, Shahnawaz Bashir, Yawar Nisar
Surgical Science (SS) , 2015, DOI: 10.4236/ss.2015.63021
Abstract:

Situs inversus, a very rare congenital anomaly of reversal site of thoracic and abdominal organs, can be very problematic to surgeon while dealing with a case of trauma in emergency. Surgical procedures are considered difficult, complex and more challenging in patients with this condition due to the anatomical difference and position of organs. We came across an interesting and very rare case of isolated blunt traumatic diaphragmatic injury in a case of situs inversus. Traumatic injuries of the diaphragm are uncommon and isolated blunt traumatic injuries of diaphragm are very rare. Our case is very unique of its kind of situs inversus with isolated right sided diaphragmatic rupture in a 60-year-old male patient presenting 4 hours after blunt trauma to chest and abdomen.

D1 versus Modified D2 Gastrectomy for Ca Stomach—A Prospective and Comparative Study  [PDF]
Alfar Nafae, Raiees Ahmad, Amber Aliya, Yawar Nisar, Pervaze Salam, Imtiyaz Ahmad
Surgical Science (SS) , 2016, DOI: 10.4236/ss.2016.71002
Abstract: Background: Carcinoma stomach remains a major malignancy and accounts for 10.4% of cancer related deaths globally. Despite improvement in chemo-radiotherapy, surgery remains the primary curative modality with special emphasis on lymphadenectomy. However the extent of lymphadenectomy performed by surgeons all over the world differs. Generally speaking, in Japan and Korea, the standard curative protocol would entail a “D2” lymphadenectomy whereas in the western world it would be considered unnecessary and the standard protocol would entail a standard “D1” lymphadenectomy. Thus prompting a newer surgical therapy of modified D2 in dissection in which pancreas and spleen are preserved. Lymph nodes surrounding stomach are divided into 20 stations and these are classified into three groups depending upon the location of the primary tumour. Aims & Objectives: The aims and objectives are to compare: 1) operative time of modified D2 gastrectomy with that of D1 gastrectomy; 2) operative morbidity and mortality of modified D2 gastrectomy with that of D1 gastrectomy; 3) the disease recurrence between modified D2 & D1 gastrectomy. Materials & Method: The study entitled D1 versus modified D2 gastrectomy for Ca stomach—a prospective, comparative study was conducted in the Postgraduate Department of General Surgery, Government Medical College, Srinagar as a prospective, comparative study over a period of three years 2012-2014. Patients with resectable gastric cancer were taken as subjects for the study and were divided in 2 groups that were closely matched to avoid any bias. Assessment of both the groups was done in identical fashion as per standard protocol. One group underwent gastrectomy with D1 lymph node dissection whereas the other group underwent gastrectomy with a modified D2 lymph node dissection (spleen and pancreas preservation). The type of lymphadenectomy was decided on randomization (simple random sampling). Results: After comparing the two procedures, it was noted that: 1) modified D2 lymphadenectomy took on an average 2 hours more than D1 gastrectomy; 2) operative mortality was same in both the procedures. Operative morbidity was seen more in modified D2 group than D1 group however this difference was statistically insignificant; 3) number of recurrence was quite significant in D1 group but no recurrence was seen in modified D2 group. Conclusion: On the basis of the study, we recommend that modified D2 gastrectomy is a better procedure than D1
Comment on "Dielectric screening and plasmons in AA-stacked bilayer graphene"
Yawar Mohammadi
Physics , 2014,
Abstract: In this comment we show that some equations and results of the paper titled "Dielectric screening and plasmons in AA-stacked bilayer graphene" are not correct. Furthermore, we present our results which seems to be more correct.
Charge screening and carrier transport in AA-stacked bilayer graphene: tuning via a perpendicular electric field
Yawar Mohammadi
Physics , 2014, DOI: 10.1016/j.ssc.2014.10.032
Abstract: The static dielectric function in AA-stacked bilayer graphene (BLG), subjected to an electric field applied perpendicular to layers, is calculated analytically within the random phase approximation (RPA). This result is used to calculate the screened Coulomb interaction and the electrical conductivity. The screened Coulomb interaction, which here can be tuned by the perpendicular electric field, shows a power-law decay as $1/(\gamma^{2}+V^2)$ at long-distance limit where $V$ and $\gamma$ are the electrical potential and the inter-layer hopping energy respectively, indicating that the Coulomb interaction is suppressed at high perpendicular electric fields. Furthermore, Our results for the effect of the short-range and the long-range (Coulomb) scattering on the electrical conductivity show that the shot-range scattering yields a constant electrical conductivity which is not affected by the perpendicular electric filed. While the electrical conductivity limited by the Coulomb scattering is enhanced by the perpendicular electric field and increases linearly in $V^2$ at small $V$ with a finite value at $V=0$, indicating that we can tune the electrical conductivity in AA-stacked BLG by applying a perpendicular electric field.
RKKY interaction in bilayer graphene
Yawar Mohammadi,Rostam Moradian
Physics , 2014, DOI: 10.1016/j.jmmm.2015.07.094
Abstract: We study the RKKY interaction between two magnetic impurities located on same layer (intralayer case) or on different layers (interlayer case) in undoped bilayer graphene in the four-bands model, by directly calculating the Green functions in the eigenvalues and eigenvectors representation. Our results show that both intra- and interlayer RKKY interactions between two magnetic impurities located on same (opposite) sublattice are always ferromagnetic (antiferromagnetic). Furthermore we find unusual long-distance decay of the RKKY interaction in BLG. The intralyer RKKY interactions between two magnetic impurities located on same sublattice, $J^{A_{n}A_{n}}(\mathbf{R})$ and $J^{B_{n}B_{n}}(\mathbf{R)}$, decay closely as $1/R^{6}$ and $1/R^{2}$ at large impurity distances respectively, but when they are located on opposite sublattices the RKKY interactions exhibit $1/R^{4}$ decays approximately. In the interlayer case, the RKKY interactions between two magnetic impurities located on same sublattice show a decay close to $1/R^{4}$ at large impurity distances, but if two magnetic impurities be on opposite sublattices the RKKY interactions, $J^{A_{1}B_{2}}(\mathbf{R})$ and $J^{B_{1}A_{2}}(\mathbf{R)}$, decay closely as $1/R^{6}$ and $1/R^{2}$ respectively. Both intra- and interlayer RKKY interactions have anisotropic oscillatory factors which for intralayer case is equal to that for single layer graphene. Our results at weak and strong interlayer coupling limits reduce to the RKKY interaction of SLG and that of BLG in the two-bands approximation respectively.
Magnetism of an adatom on biased AA-stacked bilayer graphene
Yawar Mohammadi,Rostam Moradian
Physics , 2014, DOI: 10.1016/j.physb.2014.02.010
Abstract: We study magnetism of an adatom adsorbed on AA-stacked bilayer graphene (BLG) in both unbiased and biased cases, using the Anderson impurity model. We find different magnetic phase diagrams for the adatom, depending on the energy level of the adatom, which varies from the magnetic phase diagram of adatom in normal metals to that in graphene. This is due to the individual energy dependence of the density of states (DOS) of AA-stacked BLG and anomalous broadening of the adatom energy level. Furthermore we investigate the effect of a bias voltage on DOS of AA-stacked and show that the magnetization of the adatom can be controlled by applying the bias voltage. This allows for possibility of using AA-stacked BLG in spintronic devices.
Local moment formation in bilayer graphene
Yawar Mohammadi,Rostam Moradian
Physics , 2014, DOI: 10.1016/j.ssc.2013.10.021
Abstract: The local properties of bilayer graphene (BLG) due to the spatial inhomogeneity of its sublattices are of interest. We apply Anderson impurity model to consider the local moment formation on a magnetic impurity which could be adsorbed on different sublattices of BLG. We find different features for the impurity magnetization when it is adsorbed A and B sublattices. The impurity adsorbed on A sublattice can magnetize even when the impurity level is above the Fermi level and the on-site coulomb energy is very small. But when the impurity is adsorbed on B sublattice the magnetization is possible for limited values of the impurity level and the on-site coulomb energy. This is due to different local density of the low energy states at A and B sublattices which originates from their spatial inhomogeneity. Also we show that electrical controlling the magnetization of adatoms besides it's inhomogeneity in BLG allow for possibility of using BLG in spintronic devices with higher potential than graphene.
Monitoring of Pesticide Residues in Commonly Used Fruits in Hyderabad Region, Pakistan  [PDF]
Yawar Latif, Syed Tufail Hussain Sherazi, Muhammad Iqbal Bhanger
American Journal of Analytical Chemistry (AJAC) , 2011, DOI: 10.4236/ajac.2011.228123
Abstract: A market based survey was carried out to evaluate the level of 26 pesticides in some commonly used fruits in Hyderabad region, Pakistan. Gas chromatography coupled with micro electron capture detector was used to assess the levels of pesticide residues. Gas chromatography-mass spectrometry (GC-MS) was also applied for the confirmation of results. Out of total 131 analyzed samples, 53 (40%) were found contaminated with pesticide residues while only 3 (2%) samples were exceeded the MRLs of some pesticides. Chlorpyrifos and dieldrin were detected in almost all analyzed samples. Residues of chlorpyrifos (1256 µg/kg) and endosulfan sulfate (1236 µg/kg) were found higher in orange and apple samples, respectively. The findings of this study provided important data about contamination of pesticide residue in some fruits sold in Hyderabad, Pakistan, and recommended that monitoring studies should be expanded to other fruits grown in different agro climatic regions, which may serve as basis for future policy about the standards and quality control of pesticides.
Genesis of Polio Vaccination Hindrance Syndrome in Pakistani Society, Religio-Medical Aspects  [PDF]
Sadia Fida Ullah, Farzana Ahmad Deen, Yawar Hussain
Open Journal of Social Sciences (JSS) , 2016, DOI: 10.4236/jss.2016.43015
Abstract: Polio vaccination in Pakistan has received strong reaction from the society. Many reasons have been documented in literature to explain the causes of this issue. The present study is focused on the analysis of anatomy of genesis of Polio Vaccination Hindrance Syndrome (PVHS) in the light of Quranic Verses, Hadiths (saying of Prophet) and their interpretations done by the Muslim clerics at weekly sermons (Khotbat). Along with religious explanation, the medical aspects of vaccination are also taken under consideration. It is concluded from this analysis that Islam does not resist from Polio Vaccination and related medication. The real problem lies in the perception of vaccination as an attempt to genocide Muslims, coupled with lack of interests in international agencies.
Lp Inequalities for Polynomials  [PDF]
Abdul Aziz, Nisar A. Rather
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.23038
Abstract: In this paper we consider a problem of investigating the dependence of on for every real or complex number with , , and present certain compact generali- zations which, besides yielding some interesting results as corollaries, include some well-known results, in particular, those of Zygmund, Bernstein, De-Bruijn, Erdös-Lax and Boas and Rahman as special cases.
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