Shehryar Khan - Academia.edu (original) (raw)

Papers by Shehryar Khan

Research paper thumbnail of Datum Date

Research paper thumbnail of 1.16 Risk Factors Associated With Completed Suicides in Adolescents

Journal of the American Academy of Child & Adolescent Psychiatry, 2017

Even though we have made tremendous progress in identifying risk factors for suicide in adolescen... more Even though we have made tremendous progress in identifying risk factors for suicide in adolescents, there is limited information on health care utilization prior to death by suicide. Our study objective was to determine whether treatment utilization patterns are different in adolescents who died by suicide compared with adolescents who did not die by suicide. Methods: We conducted a case control study comparing treatment utilization in individuals who died by suicide (n ¼ 104) with control subjects who did not (n ¼ 416). Participants were <17 years of age; case subjects (adolescents who died by suicide) were matched by participating site and year of death (between 2000 and 2013) to control subjects in a 4:1 ratio. This study involved eight healthcare systems. Study protocol was approved by the institutional review board at each participating site. Results: Individuals who died by suicide were more likely to have "any" mental health (MH) visit (45.2 vs. 13.2; OR 5.41, P < 0.001) and "any" chemical dependency (CD) visit (11.5 vs. 1.4; OR 8.91, P < 0.001). Further analysis revealed the following: 1) case subjects were more likely to have an inpatient MH visit (17.3 vs. 0; OR 178.16, P < 0.001) and CD visit (6.7 vs. 0; OR 64.08, P < 0.001); 2) case subjects were more likely to have an outpatient MH visit (39.4 vs. 8.7; OR 6.87, P < .001) and outpatient CD visit (7.7 vs. 0.2; OR 34.55, P < 0.001); and 3) case subjects also were more likely to have an emergency/urgent care MH visit (14.4 vs. 0.2; OR 69.94, P < 0.001) and CD visit (3.9 vs. 0.7; OR 5.51, P < 0.001). Conclusions: Individuals who died by suicide did access services more often than individuals who did not die by suicide. However, the majority of the individuals who died by suicide did not get specialty mental health care. We do not have information on time to suicide after last care episode. Future studies should investigate the time gap between the last care episode and death by suicide. This will help inform specific interventions that may help mitigate the risk of death by suicide.

Research paper thumbnail of The relationship among visual identity, team image and team reputation of professional basketball industries

Research paper thumbnail of New Issues Puzzle: Experience from Karachi Stock Exchange

Study finds that both groups of IPOs outperforms on first trading day, as average initial market ... more Study finds that both groups of IPOs outperforms on first trading day, as average initial market adjusted returns of SOE and non-SOE IPOs are 27.65 percent and 22.53 percent respectively.

Research paper thumbnail of Operating Room Students, Graduates and Faculty Members’ Experiences of the Curriculum of Operating Room Noncontinuous Undergraduate Program: A Qualitative Study

Iranian Journal of Medical Education, 2018

Research paper thumbnail of Zero-Field Splitting in Gd(III) complexes : Towards a molecular understanding of paramagnetic relaxation

The prime objectives of contrast agents in Magnetic Resonance Imaging(MRI) is to accelerate the r... more The prime objectives of contrast agents in Magnetic Resonance Imaging(MRI) is to accelerate the relaxation rate of the solvent water protons in the surrounding tissue. Paramagnetic relaxation origi ...

Research paper thumbnail of II. Sexual Orientation, Gender Identity, and Sex Development Competencies in Medical Education: Implications for Public Psychiatry

Research paper thumbnail of Comparing single-phase thermal hydraulic performance of a right and left turn twisted tape insert in a tube

Single-phase heat transfer and pressure drop tests were conducted in a tube with two types of twi... more Single-phase heat transfer and pressure drop tests were conducted in a tube with two types of twisted tapes. Each tape had exactly similar physical parameters and were made of the same material except that each had an opposite twist that resulted in a clockwise and anticlockwise flow swirl, i.e., left turn and right turn, respectively. Each type had twist ratio of 4 and 5.5 on a 180° twist. The tapes were tested in a tube-in-tube heat exchanger having 2 m length. The internal tube of the heat exchanger had 19.05 mm outer diameter and 1.65 mm wall thickness. Fresh water and 30% water/glycol solution were used as cold and hot fluids. Experiments were performed with Reynolds number varying between 2500 and 11,500 at Prandtl numbers of 9 and 14. Heat transfer and pressure drop enhancement was observed compared to plain tube at all operating conditions with 6–7% higher thermal performance with tighter twist tape. The Left Turn tape with a twist ratio of 5.5 showed slightly better thermal...

Research paper thumbnail of A complete normal mode analysis of the Zero-Field Splitting in paramagnetic hexaaqua Mn(II) and Ni(II) complexes

A complete normal mode analysis of the Zero-Field Splitting in paramagnetic hexaaqua Mn(II) and N... more A complete normal mode analysis of the Zero-Field Splitting in paramagnetic hexaaqua Mn(II) and Ni(II) complexes

Research paper thumbnail of Towards Accurate and Reproducible Uranium Isotopic Analysis via Atom Probe Mass Spectrometry

Microscopy and Microanalysis, 2020

Research paper thumbnail of A compact MIMO DRA with simultaneous frequency and isolation reconfiguration

Microwave and Optical Technology Letters, 2020

Research paper thumbnail of Zero-field splitting in the isoelectronic aqueous Gd(III) and Eu(II) complexes from a first principles analysis

Chemical Physics, 2018

Zero-field splitting in the isoelectronic aqueous Gd(III) and Eu(II) complexes from a first princ... more Zero-field splitting in the isoelectronic aqueous Gd(III) and Eu(II) complexes from a first principles analysis., Chemical Physics (2018), doi:

Research paper thumbnail of A review on the laser welding of coated 22MnB5 press-hardened steel and its impact on the production of tailor-welded blanks

Science and Technology of Welding and Joining, 2020

The current demand for vehicles with high fuel efficiency, improved safety and enhanced crashwort... more The current demand for vehicles with high fuel efficiency, improved safety and enhanced crashworthiness qualities is being met by making use of high strength components with tailored mechanical properties which are made using tailor-welded blanks. During their production, the surface of the blank needs to be protected against oxidation and decarburisation. Protective coatings are used to protect the steel surface, with Aluminium-Silicon or Zinc-based coatings being the most popular. This work provides a review on the state-of-the-art as well as the issues associated with the laser welding of coated 22MnB5 grade steel to be used in the production of tailor-welded blanks. The paper provides a summary of existing solutions available to overcome these issues while discussing their limitations and the potential for future work.

Research paper thumbnail of First-principles computations of <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow></mrow><annotation encoding="application/x-tex"></annotation></semantics></math></span><span class="katex-html" aria-hidden="true"></span></span>\hbox {Y}_{x}\hbox {Ga}_{1-{x}}$$As-ternary alloys: a study on structural, electronic, optical and elastic properties

Bulletin of Materials Science, 2019

In this work, the first-principles computational study on the structural, elastic, electronic and... more In this work, the first-principles computational study on the structural, elastic, electronic and optical properties of Y x Ga 1−x As as a function of yttrium concentration (x) is presented. The computations are performed using the fullpotential linearized augmented plane wave plus local orbital method designed within density functional theory. Firstly, we performed our calculations on the most stable phases, NaCl and zinc blende, then their transition pressure for each concentration is determined and analysed. Our computed results for the zero yttrium concentration are found consistent with the available experimental measurements as well as with theoretical predictions. Moreover, the dependencies of these parameters upon yttrium concentration (x) were found to be non-linear. We also report computed results on electronic-band structure, electronic energy band gap results and density of states. A systematic study on optical properties to analyse its optoelectronic character and elastic properties is presented.

Research paper thumbnail of Novel morphing wing actuator control-based Particle Swarm Optimisation

The Aeronautical Journal, 2019

The paper presents the design and experimental testing of the control system used in a new morphi... more The paper presents the design and experimental testing of the control system used in a new morphing wing application with a full-scaled portion of a real wing. The morphing actuation system uses four similar miniature brushless DC (BLDC) motors placed inside the wing, which execute a direct actuation of the flexible upper surface of the wing made from composite materials. The control system of each actuator uses three control loops (current, speed and position) characterised by five control gains. To tune the control gains, the Particle Swarm Optimisation (PSO) method is used. The application of the PSO method supposed the development of a MATLAB/Simulink® software model for the controlled actuator, which worked together with a software sub-routine implementing the PSO algorithm to find the best values for the five control gains that minimise the cost function. Once the best values of the control gains are established, the software model of the controlled actuator is numerically sim...

Research paper thumbnail of Design and experimental testing of a control system for a morphing wing model actuated with miniature BLDC motors

Chinese Journal of Aeronautics, 2019

Design and experimental testing of a control system for a morphing wing model actuated with minia... more Design and experimental testing of a control system for a morphing wing model actuated with miniature BLDC motors, Chinese

Research paper thumbnail of The China–Pakistan Economic Corridor (CPEC): challenges and prospects

Area Development and Policy, 2018

China-Pakistan Economic Corridor (CPEC) is believed to be a game changer for the whole region. Pr... more China-Pakistan Economic Corridor (CPEC) is believed to be a game changer for the whole region. Presently, some extra regional powers are also interested in taking benefits from this El-Dorado. In this scenario the phenomenon of this corridor is believed to have some genuine prospects and challenges. Where there some challenges are directly associated with the security of Pakistan there is also leeway of economic and social challenges. In any case, the first question of security is nevertheless related to Indian factor. Can India help Pakistan in making this project pragmatic for the whole region? Can Indian allies/buddies; in special context of War on Terror (WOT); USA and Afghanistan help Pakistan in making the deal prudent? In this contemporary era, security of any object is directly associated with economic affairs, hence the economic aspect of the same is worth discussing. What are the economic benefits of the huge partnership for Pakistan since the economy of Pakistan is still not developed? These are some of the pertinent enquiries which need to be probe into and this study will be throwing light on all these aspects.

Research paper thumbnail of Ethical implications of pursuing hemodialysis in a nonassenting incapacitated patient

Hemodialysis International, 2018

Research paper thumbnail of Serotonin Sensitivity and Withdrawal With Low-Dose Venlafaxine

The Primary Care Companion For CNS Disorders, 2019

Research paper thumbnail of Socioeconomic and Public Policy Impacts of China Pakistan Economic Corridor on Khyber Pakhtunkhwa

Environmental Management and Sustainable Development, 2019

The projects under CPEC specifically the Energy, Infrastructure and Economic zones development Pr... more The projects under CPEC specifically the Energy, Infrastructure and Economic zones development Promises significant implication for people of Pakistan. The aim of the study was top analyze the Impacts of CPEC on Socioeconomic, Public Policy, Environmental and Economic Indicators in Khyber Pakhtunkhwa. The study used T Test for the primary data collected from respondents of different Public Policy, Economic and Educational Departments in Khyber Pakhtunkwa (KPK). The results of the study support significant impacts of CPEC on Economic, Socioeconomic and Public Policy Indicators in KPK. The results also present some environmental challenges due to the CPEC project. It is concluded that health, education, business competitiveness, economic political stability will improve with the project. The Project is expected to improve the socioeconomic indicators of the underdeveloped Province of KPK. Further the Project will support the KPK Public Policy concerns such women empowerment, allocatio...

Research paper thumbnail of Datum Date

Research paper thumbnail of 1.16 Risk Factors Associated With Completed Suicides in Adolescents

Journal of the American Academy of Child & Adolescent Psychiatry, 2017

Even though we have made tremendous progress in identifying risk factors for suicide in adolescen... more Even though we have made tremendous progress in identifying risk factors for suicide in adolescents, there is limited information on health care utilization prior to death by suicide. Our study objective was to determine whether treatment utilization patterns are different in adolescents who died by suicide compared with adolescents who did not die by suicide. Methods: We conducted a case control study comparing treatment utilization in individuals who died by suicide (n ¼ 104) with control subjects who did not (n ¼ 416). Participants were <17 years of age; case subjects (adolescents who died by suicide) were matched by participating site and year of death (between 2000 and 2013) to control subjects in a 4:1 ratio. This study involved eight healthcare systems. Study protocol was approved by the institutional review board at each participating site. Results: Individuals who died by suicide were more likely to have "any" mental health (MH) visit (45.2 vs. 13.2; OR 5.41, P < 0.001) and "any" chemical dependency (CD) visit (11.5 vs. 1.4; OR 8.91, P < 0.001). Further analysis revealed the following: 1) case subjects were more likely to have an inpatient MH visit (17.3 vs. 0; OR 178.16, P < 0.001) and CD visit (6.7 vs. 0; OR 64.08, P < 0.001); 2) case subjects were more likely to have an outpatient MH visit (39.4 vs. 8.7; OR 6.87, P < .001) and outpatient CD visit (7.7 vs. 0.2; OR 34.55, P < 0.001); and 3) case subjects also were more likely to have an emergency/urgent care MH visit (14.4 vs. 0.2; OR 69.94, P < 0.001) and CD visit (3.9 vs. 0.7; OR 5.51, P < 0.001). Conclusions: Individuals who died by suicide did access services more often than individuals who did not die by suicide. However, the majority of the individuals who died by suicide did not get specialty mental health care. We do not have information on time to suicide after last care episode. Future studies should investigate the time gap between the last care episode and death by suicide. This will help inform specific interventions that may help mitigate the risk of death by suicide.

Research paper thumbnail of The relationship among visual identity, team image and team reputation of professional basketball industries

Research paper thumbnail of New Issues Puzzle: Experience from Karachi Stock Exchange

Study finds that both groups of IPOs outperforms on first trading day, as average initial market ... more Study finds that both groups of IPOs outperforms on first trading day, as average initial market adjusted returns of SOE and non-SOE IPOs are 27.65 percent and 22.53 percent respectively.

Research paper thumbnail of Operating Room Students, Graduates and Faculty Members’ Experiences of the Curriculum of Operating Room Noncontinuous Undergraduate Program: A Qualitative Study

Iranian Journal of Medical Education, 2018

Research paper thumbnail of Zero-Field Splitting in Gd(III) complexes : Towards a molecular understanding of paramagnetic relaxation

The prime objectives of contrast agents in Magnetic Resonance Imaging(MRI) is to accelerate the r... more The prime objectives of contrast agents in Magnetic Resonance Imaging(MRI) is to accelerate the relaxation rate of the solvent water protons in the surrounding tissue. Paramagnetic relaxation origi ...

Research paper thumbnail of II. Sexual Orientation, Gender Identity, and Sex Development Competencies in Medical Education: Implications for Public Psychiatry

Research paper thumbnail of Comparing single-phase thermal hydraulic performance of a right and left turn twisted tape insert in a tube

Single-phase heat transfer and pressure drop tests were conducted in a tube with two types of twi... more Single-phase heat transfer and pressure drop tests were conducted in a tube with two types of twisted tapes. Each tape had exactly similar physical parameters and were made of the same material except that each had an opposite twist that resulted in a clockwise and anticlockwise flow swirl, i.e., left turn and right turn, respectively. Each type had twist ratio of 4 and 5.5 on a 180° twist. The tapes were tested in a tube-in-tube heat exchanger having 2 m length. The internal tube of the heat exchanger had 19.05 mm outer diameter and 1.65 mm wall thickness. Fresh water and 30% water/glycol solution were used as cold and hot fluids. Experiments were performed with Reynolds number varying between 2500 and 11,500 at Prandtl numbers of 9 and 14. Heat transfer and pressure drop enhancement was observed compared to plain tube at all operating conditions with 6–7% higher thermal performance with tighter twist tape. The Left Turn tape with a twist ratio of 5.5 showed slightly better thermal...

Research paper thumbnail of A complete normal mode analysis of the Zero-Field Splitting in paramagnetic hexaaqua Mn(II) and Ni(II) complexes

A complete normal mode analysis of the Zero-Field Splitting in paramagnetic hexaaqua Mn(II) and N... more A complete normal mode analysis of the Zero-Field Splitting in paramagnetic hexaaqua Mn(II) and Ni(II) complexes

Research paper thumbnail of Towards Accurate and Reproducible Uranium Isotopic Analysis via Atom Probe Mass Spectrometry

Microscopy and Microanalysis, 2020

Research paper thumbnail of A compact MIMO DRA with simultaneous frequency and isolation reconfiguration

Microwave and Optical Technology Letters, 2020

Research paper thumbnail of Zero-field splitting in the isoelectronic aqueous Gd(III) and Eu(II) complexes from a first principles analysis

Chemical Physics, 2018

Zero-field splitting in the isoelectronic aqueous Gd(III) and Eu(II) complexes from a first princ... more Zero-field splitting in the isoelectronic aqueous Gd(III) and Eu(II) complexes from a first principles analysis., Chemical Physics (2018), doi:

Research paper thumbnail of A review on the laser welding of coated 22MnB5 press-hardened steel and its impact on the production of tailor-welded blanks

Science and Technology of Welding and Joining, 2020

The current demand for vehicles with high fuel efficiency, improved safety and enhanced crashwort... more The current demand for vehicles with high fuel efficiency, improved safety and enhanced crashworthiness qualities is being met by making use of high strength components with tailored mechanical properties which are made using tailor-welded blanks. During their production, the surface of the blank needs to be protected against oxidation and decarburisation. Protective coatings are used to protect the steel surface, with Aluminium-Silicon or Zinc-based coatings being the most popular. This work provides a review on the state-of-the-art as well as the issues associated with the laser welding of coated 22MnB5 grade steel to be used in the production of tailor-welded blanks. The paper provides a summary of existing solutions available to overcome these issues while discussing their limitations and the potential for future work.

Research paper thumbnail of First-principles computations of <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow></mrow><annotation encoding="application/x-tex"></annotation></semantics></math></span><span class="katex-html" aria-hidden="true"></span></span>\hbox {Y}_{x}\hbox {Ga}_{1-{x}}$$As-ternary alloys: a study on structural, electronic, optical and elastic properties

Bulletin of Materials Science, 2019

In this work, the first-principles computational study on the structural, elastic, electronic and... more In this work, the first-principles computational study on the structural, elastic, electronic and optical properties of Y x Ga 1−x As as a function of yttrium concentration (x) is presented. The computations are performed using the fullpotential linearized augmented plane wave plus local orbital method designed within density functional theory. Firstly, we performed our calculations on the most stable phases, NaCl and zinc blende, then their transition pressure for each concentration is determined and analysed. Our computed results for the zero yttrium concentration are found consistent with the available experimental measurements as well as with theoretical predictions. Moreover, the dependencies of these parameters upon yttrium concentration (x) were found to be non-linear. We also report computed results on electronic-band structure, electronic energy band gap results and density of states. A systematic study on optical properties to analyse its optoelectronic character and elastic properties is presented.

Research paper thumbnail of Novel morphing wing actuator control-based Particle Swarm Optimisation

The Aeronautical Journal, 2019

The paper presents the design and experimental testing of the control system used in a new morphi... more The paper presents the design and experimental testing of the control system used in a new morphing wing application with a full-scaled portion of a real wing. The morphing actuation system uses four similar miniature brushless DC (BLDC) motors placed inside the wing, which execute a direct actuation of the flexible upper surface of the wing made from composite materials. The control system of each actuator uses three control loops (current, speed and position) characterised by five control gains. To tune the control gains, the Particle Swarm Optimisation (PSO) method is used. The application of the PSO method supposed the development of a MATLAB/Simulink® software model for the controlled actuator, which worked together with a software sub-routine implementing the PSO algorithm to find the best values for the five control gains that minimise the cost function. Once the best values of the control gains are established, the software model of the controlled actuator is numerically sim...

Research paper thumbnail of Design and experimental testing of a control system for a morphing wing model actuated with miniature BLDC motors

Chinese Journal of Aeronautics, 2019

Design and experimental testing of a control system for a morphing wing model actuated with minia... more Design and experimental testing of a control system for a morphing wing model actuated with miniature BLDC motors, Chinese

Research paper thumbnail of The China–Pakistan Economic Corridor (CPEC): challenges and prospects

Area Development and Policy, 2018

China-Pakistan Economic Corridor (CPEC) is believed to be a game changer for the whole region. Pr... more China-Pakistan Economic Corridor (CPEC) is believed to be a game changer for the whole region. Presently, some extra regional powers are also interested in taking benefits from this El-Dorado. In this scenario the phenomenon of this corridor is believed to have some genuine prospects and challenges. Where there some challenges are directly associated with the security of Pakistan there is also leeway of economic and social challenges. In any case, the first question of security is nevertheless related to Indian factor. Can India help Pakistan in making this project pragmatic for the whole region? Can Indian allies/buddies; in special context of War on Terror (WOT); USA and Afghanistan help Pakistan in making the deal prudent? In this contemporary era, security of any object is directly associated with economic affairs, hence the economic aspect of the same is worth discussing. What are the economic benefits of the huge partnership for Pakistan since the economy of Pakistan is still not developed? These are some of the pertinent enquiries which need to be probe into and this study will be throwing light on all these aspects.

Research paper thumbnail of Ethical implications of pursuing hemodialysis in a nonassenting incapacitated patient

Hemodialysis International, 2018

Research paper thumbnail of Serotonin Sensitivity and Withdrawal With Low-Dose Venlafaxine

The Primary Care Companion For CNS Disorders, 2019

Research paper thumbnail of Socioeconomic and Public Policy Impacts of China Pakistan Economic Corridor on Khyber Pakhtunkhwa

Environmental Management and Sustainable Development, 2019

The projects under CPEC specifically the Energy, Infrastructure and Economic zones development Pr... more The projects under CPEC specifically the Energy, Infrastructure and Economic zones development Promises significant implication for people of Pakistan. The aim of the study was top analyze the Impacts of CPEC on Socioeconomic, Public Policy, Environmental and Economic Indicators in Khyber Pakhtunkhwa. The study used T Test for the primary data collected from respondents of different Public Policy, Economic and Educational Departments in Khyber Pakhtunkwa (KPK). The results of the study support significant impacts of CPEC on Economic, Socioeconomic and Public Policy Indicators in KPK. The results also present some environmental challenges due to the CPEC project. It is concluded that health, education, business competitiveness, economic political stability will improve with the project. The Project is expected to improve the socioeconomic indicators of the underdeveloped Province of KPK. Further the Project will support the KPK Public Policy concerns such women empowerment, allocatio...