Measuring Financial Risk using Extreme Value Theory: evidence from Pakistan

The purpose of the paper is to show some methods of extreme value theory through analysis of Pakistani nancial data. It also in- troduced the fundamental of extreme value theory as well as practical aspects for estimating and assessing nancial models for tail related risk measures.Extreme Value Theory; Value at Risk; Financial Risk Man- agement; Financial Risk Modeling; Financial Time Series.

Generation of electrical energy using lead zirconate titanate (PZT-5A) piezoelectric material: Analytical, numerical and experimental verifications

Energy harvesting is the process of attaining energy from the external sources and transforming it into usable electrical energy. An analytical model of piezoelectric energy harvester has been developed to determine the output voltage across an electrical circuit when it is forced to undergo a base excitation. This model gives an easy approach to design and investigate the behavior of piezoelectric material. Numerical simulations have been carried out to determine the effect of frequency and loading on a Lead zirconate titanate (PZT-5A) piezoelectric material. It has been observed that the output voltage from the harvester increases when loading increases whereas its resonance frequency decreases. The analytical results were found to be in good agreement with the experimental and numerical simulation results

Measuring Financial Risk using Extreme Value Theory: evidence from Pakistan

The purpose of the paper is to show some methods of extreme value theory through analysis of Pakistani nancial data. It also in- troduced the fundamental of extreme value theory as well as practical aspects for estimating and assessing nancial models for tail related risk measures

Measuring Financial Risk using Extreme Value Theory: evidence from Pakistan

The purpose of the paper is to show some methods of extreme value theory through analysis of Pakistani nancial data. It also in- troduced the fundamental of extreme value theory as well as practical aspects for estimating and assessing nancial models for tail related risk measures

Micromechanical effect of martensite attributes on forming limits of dual-phase steels investigated by crystal plasticity-based numerical simulations

This study analyses the effect of martensite grain size and its volume fraction in dual-phase (DP) steel on (1) the formability limit, (2) average global behavior under different loading conditions, and (3) damage initiation. The virtual RVEs (Representative Volume Elements) were constructed using DREAM.3D software with a variation of microstructural attributes. The numerical simulations were carried out using DAMASK, which evaluates the polycrystalline material point behavior and solves versatile constitutive equations using a spectral solver. The simulations were post-processed to obtain global and local stress, strain, and damage evolution in constructed RVEs. The global results were processed to obtain FLDs according to Keeler-Brazier (K-B) and Marciniak and Kuczynski (M-K) criteria. In this work, the capability of microstructure-based numerical simulations to analyze the FLDs has been established successfully. From Forming Limit Diagrams (FLDs), it was observed that formability changes by changing the strain hardening coefficients (n-values), the martensite fraction, and martensite grain sizes of DP steels. The improved formability was observed with lower martensite fraction, i.e., 17%, decreased martensite grain size, i.e., 2.6 µm, and higher strain hardening coefficient. The M-K approach shows the better capability to predict the formability by various loading conditions and clarifies the necking marginal zone of FLD. The damage propagation is also strongly affected by the loading conditions. The current study would be a good guide for designers during the manufacturing and selecting of appropriate DP steels based on the service loading conditions

Board gender diversity and stock price crash risk: Going beyond tokenism

Abstract We empirically examine the role of board gender diversity in influencing stock price crash risk at the firm-level in twelve (12) Asia-Pacific Markets. Using a dataset comprising data from 1021 listed firms over the period 2006–2016, we employ a random effect model in a regression setting. Controlling for the firm and market-level variables, we find that board gender diversity results in lowering the stock price crash risk of the firm. Bifurcating women directors on corporate board into numerical representation (token and critical mass representation), the results support our main conjectures and suggest that the economic significance of this relationship is higher for firms that have three or more women directors on the board as compared to the firms that have less than three women directors on the corporate board. Our results are robust to alternative measures of stock price crash risk, potential endogeneity and selection biases

Characterization of bioactive fatty acids and oxidative stability of microwave vacuum dried fish powder supplemented extruded product

his study was aimed to determine the retention of bioactive fatty acids and oxidative stability of fish powder (FP) supplemented extruded products. The Labeo rohita fish meat was minced, microwave vacuum dried, and extruded. Product formulations containing FP (0-25%) and semolina (75-100%) were optimized using response surface methodology. The maximum bioactive fatty acids retention was 94.84% in the final product. The highest values of polyunsaturated fatty acids (PUFAs) were 87.97% and 85.66% at 25 °C for 30 and 60 days. Maximum TBARS values were 0.42 and 0.44 mg MDA/kg at 25 °C for 0 and 30 days, respectively. The highest carbonyl contents were 6.02, 7.67, 9.37 nmol/mg protein for 0, 30, and 60 days of storage at 25 °C, respectively. The moderate barrel exit temperature (125 °C) and feed moisture contents (20%) and high screw speed (150 rpm), FP (25%) exhibit the highest retention of PUFAs in a produc

A Morphological and Biochemical Study of Ethanolic Fruit Extract of Berberis Vulgaris Against Gentamicin Induced Renal Damage in Albino Rats

Objective: To analyze the reno protective potential of berberis vulgaris on renal function by measuring renal biomarkers (serum urea and serum creatinine). Study Design: Experimental lab-based study. Place and Duration of Study: Study was done in Baqai Medical & Dental University 4 July 2017 to 3 Aug 2017. Materials and Methods: Forty adult healthy male laboratory animals were randomly divided into four groups. Group A was treated as control group. Group B were administered with Berberis vulgaris fruit extract 100 mg/kg/body wt. single oral dose for 21 days. Group C were administered with gentamicin 100 mg/kg/day intraperitoneally single dose for 21 days. Group D, animals received gentamicin intraperitoneally 100mg/kg/day along with berberis vulgaris fruit extract orally for 21 days. Both kidneys were dissected, all sections obtained were stained with two dyes hematoxylin and eosin and periodic acid schiff stain for histomorphology. Standard error of mean was used to express results. Numerical data obtained from different groups were analyzed using SPSS version 21. P-value of 0.05 or less than 0.05 was considered statistically significant. Results: This study revealed that body weight, kidney weight has been reduced in gentamicin group whereas biomarkers and relative weight of kidney have shown significant increase in group D as compared to control group. Conclusion: Berberis vulgaris fruit extract ameliorates functional abnormalities along with biochemical parameters associated with gentamicin induced nephrotoxicit