A High Performance Solar-Blind Detector Based on Mixed-Phase Zn0.45Mg0.55O Alloy Nanowires Network

Sai Ma,Shuanglong Feng,Shuai Kang,Feng Wang,Xie Fu,Wenqiang Lu 대한금속·재료학회 2019 ELECTRONIC MATERIALS LETTERS Vol.15 No.3

The mixed-phase Zn 0.45 Mg 0.55 O alloy nanowires network was fi rstly synthesized on SiO 2 /Si substrate by chemical vapordeposition method. The metal–semiconductor–metal structured Zn 0.45 Mg 0.55 O nanowires solar-blind photodetector with asharp absorption peak of wavelength 245 nm was fabricated, which exhibited an ultra-low dark current (0.2 nA), a high on–offratio (2.85 × 10 3 ), a large peak responsivity (0.48 A/W) at 6 V bias, and a high external quantum effi ciency (234.2%). Thisexcellent performance is comparable with other ZnMgO thin fi lm UV photodetectors. Moreover, the detection mechanism ofthis photodetector is explained by the modifi cations in energy band diagrams of diff erent nanojunctions among Zn 0.45 Mg 0.55 Onanowires and heterojunction interfaces between wurtzite and cubic structured ZnMgO in mixed-phase Zn 0.45 Mg 0.55 Onanowire. It is found that nanojunctions and heterojunction interfaces could be responsible for a low dark current and highresponsivity of this device based on mixed-phase Zn 0.45 Mg 0.55 O nanowire materials. This work reveals that the distinctiveadvantages of mixed-phase ZnMgO nanowires network for ultraviolet optoelectronic detection applications.

Radio labeling and Radio Number For Generalized Caterpillar Graphs

Saima Nazeer,M. Saqib Khan,Imrana Kausar,Waqas Nazeer 한국전산응용수학회 2016 Journal of applied mathematics & informatics Vol.34 No.5

A Radio labeling of the graph $G$ is a function $g$ from the vertex set $V(G)$ of $G$ to $\mathbb{Z}^{+}$ such that $|g(u)-g(v)|\geq\text{diam}(G)+1-d_G(u,v)$, where diam$(G)$ and $d(u,v)$ are diameter and distance between $u$ and $v$ in graph $G$ respectively. The radio number rn$(G)$ of $G$ is the smallest number $k$ such that $G$ has radio labeling with max$\{g(v):v\in V(G)\}=k$. We investigate radio number for some families of generalized caterpillar graphs.

Some new estimates for exponentially $(\hbar,\mathfrak{m})$-convex functions via extended generalized fractional integral operators

Saima Rashid,Muhammad Aslam Noor,Khalida Inayat Noor 강원경기수학회 2019 한국수학논문집 Vol.27 No.4

In the article, we present several new Hermite-Hadamard and Hermite-Hadamard-Fej\'{e}r type inequalities for the exponentially $(\hbar,\mathfrak{m})$-convex functions via an extended generalized Mittag-Leffler function. As applications, some variants for certain typ e of fractional integral operators are established and some remarkable special cases of our results are also have been obtained.

Wavelet Threshold De- Noising for Mammogram Images

Saima Anwar Lashari,Rosziati Ibrahim,Norhalina Senan 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.6

Digital mammograms are coupled with noise which makes de-noising a challenging problem. In the literature, few wavelets like daubechies db3 and haar have been used for de-noising medical images. However, wavelet filters such as sym8, daubechies db4 and coif1 at certain level of soft and hard threshold have not been taken into account for mammogram images. Therefore, in this study five wavelet filters namely: haar, sym8, daubechies db3, db4 and coif1 at certain level of soft and hard threshold have been considered. Later, peak signal to noise ratio and mean squared error values are calculated. From the obtained results, it can be concluded that db3 (46.44656 db for hard threshold and 43.80779 db for soft threshold) is more appropriate filter for de-noising mammogram images while compared with other wavelets filters.

Radio and Radio Antipodal Labelings For Circulant Graphs

Saima Nazeer,Imrana Kousar,Waqas Nazeer 한국전산응용수학회 2015 Journal of applied mathematics & informatics Vol.33 No.1

A radio $k$-labeling $f$ of a graph $G$ is a function $f$ from $V(G)$ to $Z^{+}\cup\{0\}$ such that$d(x,y)+|f(x)-f(y)|\geq k+1$ for every two distinct vertices $x$ and $y$ of $G$, where $d(x,y)$ is the distance between any two vertices $x, y\in G$. The span of a radio $k$-labeling $f$ is denoted by $sp(f)$ and defined as max$\{|f(x)-f(y)|: x,y\in V(G)\}$. The radio $k$-labeling is a radio labeling when$k=\text{diam}(G)$. In other words, a radio labeling is an injective function $f:V(G)\rightarrow Z^{+}\cup\{0\}$ such that$$|f(x)-f(y)|\geq \text{diam}(G)+1-d(x,y)$$ for any pair of vertices $x, y \in G$. The radio number of $G$denoted by rn$(G)$, is the lowest span taken over all radio labelings of the graph. When $k=\text{diam}(G)-1$, a radio $k$- labeling is called a radioantipodal labeling. An antipodal labeling for a graph $G$ is a function $f:V(G)\rightarrow\{0, 1, 2, ...\}$such that $d(x,y)+|f(x)-f(y)|\geq \text{diam}(G)$ holds for all $x,y\in G$. The radio antipodal number for $G$ denoted by an$(G)$, is the minimum span of an antipodal labeling admitted by $G$. In this paper, we investigate the exact value of the radio number and radio antipodal number for thecirculant graphs $G(4k+2;\{1,2\})$.

An Experimental Study on the Meaning of Urdu Universal Quantifiers

( Saima Hassan ) 서울대학교 인지과학연구소 2010 Journal of Cognitive Science Vol.11 No.2

The virtually universal opinion of semanticists is that the collective or distributive construal of English quantified statements results from the collective and distributive properties of different quantifiers with necessarily collective or distributive predicate types. The evidence adduced to support such analyses is based almost exclusively on previous research on English quantifiers (Vendler, 1967; Hogg, 1977; Dowty, 1987; Szabolcsi, 1997; Beghelli and Stowell, 1997; Kearns, 2000; Tunstall, 1998 among many others). It is generally assumed that adults are essentially error-free in their comprehension of sentences containing universal quantifiers, although they are not as sensitive to semantic anomalies as they are to syntactic violations or do not consider them as serious (Ni et al., 1998; Pearlmutter et al., 1999; Braze et al., 2002; Angrilli et al., 2002; Hagoort, 2003; Sorace and Keller, 2005). The aim of this paper is to subject these beliefs to cross-linguistic scrutiny. I begin by reviewing the evidence that the English universal quantifier all has a bias towards a collective interpretation, while each/every is biased towards a distributive interpretation. Pursuing this idea for the analysis of Urdu, I present a simple questionnaire study carried out on native speakers of Urdu. The questionnaire was designed to explore whether native speakers of Urdu are sensitive to the collective/distributive properties of Urdu universal quantifiers, and whether they are differentially sensitive to semantic/syntactic anomalies in quantified statements. I discuss the implications of this for the cross-linguistic analysis of universal quantifiers.

New species of the genus Chelopistes (Ischnocera: Philopteridae) from Pakistan

Saima Naz,Syed Anser Rizvi 한국응용곤충학회 2012 Journal of Asia-Pacific Entomology Vol.15 No.1

A new species of Chelopistes Kéler from common turkey fowl Meleagris gallopavo L. from Karachi, Pakistan is described in detail with reference to morphology and genitalia. The new species is also compared with its closest known ally, Chelopistes meleagridis, a common cosmopolitan parasite previously described from common turkey fowl.

A novel nonsense mutation in NPR2 gene causing Acromesomelic dysplasia, type Maroteaux in a consanguineous family in Southern Punjab (Pakistan)

Saima Mustafa,Zafrin Akhtar,Muhammad Latif,Mubashir Hassan,Muhammad Faisal,Furhan Iqbal 한국유전학회 2020 Genes & Genomics Vol.42 No.8

Background Acromesomelic dysplasia, type Maroteaux (AMDM) is a rare skeletal dysplasia following autosomal recessive mode of inheritance and characterized by abnormal growth plates, short and abnormal bones in the extremities and spine. Objective Present study was designed to report the molecular basis of AMDM in enrolled consanguineous family from Pakistan. Methods A consanguineous family from Vehari District in Pakistan having multiple siblings suffering from AMDM was enrolled in present study. Whole exome sequencing (WES) approach was adopted to identify causative agent of AMDM. Human full length NPR2 gene and sequence with nonsense mutation was amplified by using Myc-tagged pXN vector and transformed in E. coli DH5α cells to confirm mutation. SDS-PAGE and Western blotting were done to confirm the production of truncated protein. Computational three dimensional structure generation through homology modeling approach was done to compare protein structure between patients and controls. Results WES reveled a nonsense mutation (c.613 C>T, p.R205X) in exon 1 of NPR2 gene leading to premature termination codon in mRNA of NPR2 gene resulting in a truncated protein with 204 amino acid residues that was confirmed by SDSPAGE and Western blotting. Sanger sequencing confirmed that mutation in all subjects and mutation followed Mendalian pattern of inheritance. Multiple sequence alignment by ClustalW revealed that mutated domain of NPR2 is conserved region. Proetin structure comparison revealed a significant structural part of NPR2 was missing in truncated protein as compared to control. Conclusion We are reporting that a novel nonsense mutation (c.613 C>T, p.R205X) in exon 1 of NPR2 gene is causing AMDM in a consanguineous Pakistani family.

Coverage percentage and coverage rate of different DNA nanostructures grown on a mica substrate

Saima Bashar,김승재,황시운,레디,하태환,박성하 한국물리학회 2015 Current Applied Physics Vol.15 No.11

In this study, we simultaneously grew different DNA nanostructures, including 5 helix ribbon (5HR), double-crossover (DX), and double-crossover with single hairpin (DX-SH) lattices, on a mica substrate, and we analyzed the concentration-dependent coverage percentages of 5HR at a fixed concentration of DX ([DX]), DX at a fixed [5HR], and DX-SH with both fixed [5HR] and [DX]. The structural features of the various nanostructures formed through mica-assisted growth annealing were confirmed via atomic force microscopy. To assess the temperature-dependent coverage rates on the given substrates, we introduced two simple models, i.e., the equipartition model (EPM) and the un-equipartition model (UEPM) which provide information on the amount of coverage for each of the given temperature. EPM provides an equal amount of the coverage percentage per temperature change due to its linear nature, but UEPM does not since it has a non-linear nature. The coverage percentages obtained by these models allow us to calculate, as a function of temperature, the coverage rates of 5HR at a fixed [DX] and DX-SH for both fixed [5HR] and [DX]. Although with EPM the coverage rates for the 5HR and DX-SH decreased linearly as the temperature decreased, they decreased non-linearly as the temperature decreased with UEPM.

Fitting of equilibrium and kinetic data for the removal of Novacron Orange P-2R by sugarcane bagasse

Saima Noreen,Haq Nawaz Bhatti 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4

In this study, the potential of sugarcane bagasse, to remove Novacron Orange P-2R dye from aqueous solution by adsorption was investigated in batch mode. Different process parameters were optimized for biosorption process. Equilibrium biosorption isotherms, kinetics and thermodynamics were investigated in batch mode. The biosorption data were fitted well to the Langmuir isotherm. The kinetic data obtained at different concentration have been analyzed using pseudo-first-order, pseudo-second-order and intraparticle diffusion models. The best fitted kinetic model was found to be pseudo-second-order. The FTIR spectrum was recorded to find out the functional groups involved.