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  1. DFT-based study of Na2AgAlX6 (X = Cl, Br) halide double perovskites: insights from PBEsol, TB-mBJ, and HSE06 calculations for photovoltaic and photocatalytic applications

    Article • Physica Scripta, April 2025, Institute of Physics Publishing

    Dr. Hamid Ullah

  2. Magneto-optic and photocatalytic response of CuCrX3 (X=Cl, Br, I) for energy storage applications

    Article • Computational Condensed Matter, March 2025, Elsevier

    Dr. Hamid Ullah

  3. Strain dependent physical properties of the lead-free perovoskite ZnZrO3 for energy device applications

    Article • Solid State Communications, March 2025, Elsevier

    Dr. Hamid Ullah

  4. Strain modulated physical properties of double perovskite Rb2InGaCl6 for the possible energy applications

    Article • Physica B Condensed Matter, March 2025, Elsevier

    Dr. Hamid Ullah

  5. Exploration of Sn-based janus materials for emerging renewable energy applications

    Article • Physica B Condensed Matter, February 2025, Elsevier

    Dr. Hamid Ullah

  6. Optoelectronic and thermoelectric response of lead-free halide double perovskites Rb2BiAuX6 (X = Cl, Br, I) for energy storage applications

    Article • RSC Advances, January 2025, Royal Society of Chemistry

    Dr. Hamid Ullah

  7. Doping dependent magnetic and thermoelectric response of perovskite BaGeO3 for spintronics and energy applications

    Article • Computational Condensed Matter, December 2024, Elsevier

    Dr. Hamid Ullah

  8. Preparation, Swelling, and Drug Release Studies of Chitosan-based Hydrogels for Controlled Delivery of Buspirone Hydrochloride

    Article • Current Pharmaceutical Biotechnology, October 2024, Bentham Science Publishers

    Dr. Hamid Ullah

  9. Screening the structural, optoelectronic and thermoelectric features of novel inverse perovskites X3MgNa (X= Cl, Br and I): A theoretical investigation

    Article • Solid State Communications, October 2024, Elsevier

    Dr. Hamid Ullah

  10. Computational Prediction of Structural, Optoelectronic, Thermodynamic, and Thermoelectric Response of the Cubic Perovskite RbTmCl3 via DFT‐mBJ + SOC Studies

    Article • physica status solidi (b), August 2024, Wiley

    Dr. Hamid Ullah

  11. Unveiling the thermoelectric, optical and mechanical performances of Hafnium and Zirconium based Beryllium oxide perovskite

    Article • Materials Today Communications, August 2024, Elsevier

    Dr. Hamid Ullah

  12. A computational approach to study the halides-based double perovskites Cs2InAuX6 (X=Cl, Br) for low-cost energy technologies

    Article • Physica B Condensed Matter, June 2024, Elsevier

    Dr. Hamid Ullah

  13. Optoelectronic and thermoelectric response of lead free halide double perovskites Rb2AgPX6 (X = Cl, Br, I) for energy storage applications

    Article • Opto-electronics, May 2024, Springer Science + Business Media

    Dr. Hamid Ullah

  14. Computational Insight into the Physical Properties of Bulk MP (M = Li, Na, K) for Energy Applications

    Article • ACS Omega, May 2024, American Chemical Society (ACS)

    Dr. Hamid Ullah

  15. Magneto-Optic and thermoelectric response of doped SrZrO3 for energy storage applications

    Article • Journal of Magnetism and Magnetic Materials, May 2024, Elsevier

    Dr. Hamid Ullah

  16. Unveiling the mechanical, structural, thermoelectric, and optoelectronic potential of K2NaGaBr6 and K2RbTlBr6 double perovskites for sustainable technologies

    Article • Solar Energy, May 2024, Elsevier

    Dr. Hamid Ullah

  17. First principles study of magneto-electronic and thermoelectric properties of quaternary CoZrMnSb for spintronics and waste heat recovery energy applications

    Article • Opto-electronics, April 2024, Springer Science + Business Media

    Dr. Hamid Ullah

  18. Formulation and In Vitro Assessment of Polymeric pH-Responsive Nanogels of Chitosan for Sustained Delivery of Madecassoside

    Article • ACS Omega, April 2024, American Chemical Society (ACS)

    Dr. Hamid Ullah

  19. Screening the structural, dynamical, and mechanical stability, tuning band gaps, and optical properties of inorganic Cs2RbABr6 (A = Tl and Bi) double perovskites halide using DFT calculations

    Article • Opto-electronics, April 2024, Springer Science + Business Media

    Dr. Hamid Ullah

  20. Revealing the remarkable structural, electronic, elastic, and optical properties of Zn-based fluoropervskite ZnXF3 (x = Sr, Ba) employing DFT

    Article • Indian Journal of Physics, March 2024, Springer Science + Business Media

    Dr. Hamid Ullah

  21. Electro-optic and thermoelectric reponse of SiP and SiAs for solar and thermal applications

    Article • Physica Scripta, March 2024, Institute of Physics Publishing

    Dr. Hamid Ullah

  22. Mechanical and thermal response of XFe2O4 (X = Zn, Ag and Co) spinel ferrites via IR-spectroscopy and first-principles calculations

    Article • Physica Scripta, March 2024, Institute of Physics Publishing

    Dr. Hamid Ullah

  23. Insight into the structural, elastic, phonon dispersions, and optoelectronic properties of Cs2YXCl6 (X = In, Tl) double perovskites for solar cells and energy conversion applications

    Article • Optik, March 2024, Elsevier

    Dr. Hamid Ullah

  24. Study of ferromagnetism, and thermoelectric behavior of double perovskites K2Z(Cl/Br)6 (Z = Ta, W, Re) for spintronic, and energy application

    Article • Journal of Physics and Chemistry of Solids, March 2024, Elsevier

    Dr. Hamid Ullah

  25. Tuning the electronic structure and Schottky barrier by NbX2 contact to MXY (M=Mo, W; (X≠Y) S, Se, Te) monolayer

    Article • Micro and Nanostructures, March 2024, Elsevier

    Dr. Hamid Ullah

  26. Exploring Silicon-Based Ca2TiSiO6 Ordered Double Perovskite Oxides: a Comprehensive DFT Investigation of Structural, Dynamical, Mechanical Stability, and Optoelectronic Properties

    Article • Silicon, February 2024, Springer Science + Business Media

    Dr. Hamid Ullah

  27. Insight into the physical properties of Rb2YCuX6 (X = Br and I) lead-free elpasolite for high-energy applications

    Article • Physica Scripta, February 2024, Institute of Physics Publishing

    Dr. Hamid Ullah

  28. First-principle study of Mg-based rare earth spinels MgSm2Y4 (Y S, Se) for spintronic and thermoelectric devices

    Article • Materials Chemistry and Physics, February 2024, Elsevier

    Dr. Hamid Ullah

  29. Exploration of optoelectronic, thermodynamic, and thermoelectric properties of RFeO3 (R = Pr, Nd) perovskites

    Article • Materials Science and Engineering B, January 2024, Elsevier

    Dr. Hamid Ullah

  30. Exploring structural, electronic, magnetic, and optical response of GaN-X (X=Sr, ba, cs, mg) materials for optoelectronic applications

    Article • Physica B Condensed Matter, January 2024, Elsevier

    Dr. Hamid Ullah

  31. Study of half-metallic ferromagnetism and transport characteristics of double perovskites Sr2AIrO6 (A = Y, Lu, Sc) for spintronic applications

    Article • RSC Advances, January 2024, Royal Society of Chemistry

    Dr. Hamid Ullah

  32. Preparation of chondroitin sulfate and polyvinyl alcohol hydrogels as drug carriers

    Article • Applied Surface Science Advances, December 2023, Elsevier

    Dr. Hamid Ullah

  33. Vibrational and transport phenomenon in Cs2CdZnCl6 double perovskite: A DFT study

    Article • Solid State Ionics, December 2023, Elsevier

    Dr. Hamid Ullah

  34. Theoretical investigations of electronic structure, magnetic and optical properties of CdS-X (X= Sm, La, Ce) materials for optoelectronic applications

    Article • Solid State Communications, November 2023, Elsevier

    Dr. Hamid Ullah

  35. Electronic Structure and Magnetic Anisotropy Response of Janus Monolayer VSeTe

    Article • physica status solidi (b), September 2023, Wiley

    Dr. Hamid Ullah

  36. Fabrication and In vitro Evaluation of Carbopol/Polyvinyl Alcohol-based pH-sensitive Hydrogels for Controlled Drug Delivery

    Article • Current Pharmaceutical Design, September 2023, Bentham Science Publishers

    Paochu Wu, Dr. Hamid Ullah

  37. An insight into the electronic, optical and magnetic properties of CeO2-X (X=Al, Ga) materials for optoelectronic applications

    Article • Solid State Sciences, September 2023, Elsevier

    Dr. Hamid Ullah

  38. DFT calculations of opto-electronic, mechanical, thermodynamic, and transport properties of XCeO3 (X = Mg, Ca, and Ba) perovskite

    Article • The Journal of Chemical Thermodynamics, September 2023, Elsevier

    Dr. Hamid Ullah

  39. Enhanced Photocatalytic Degradation of Malachite Green Dye Using Silver–Manganese Oxide Nanoparticles

    Article • Molecules, August 2023, MDPI AG

    Dr. Hamid Ullah

  40. Xanthan-Gum/Pluronic-F-127-Based-Drug-Loaded Polymeric Hydrogels Synthesized by Free Radical Polymerization Technique for Management of Attention-Deficit/Hyperactivity Disorder

    Article • Gels, August 2023, MDPI AG

    Dr. Hamid Ullah

  41. Effect of low energy cesium ion irradiation on vanadium oxide: Structural and spectroscopic study

    Article • Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms, August 2023, Elsevier

    Dr. Hamid Ullah

  42. Theoretical study of rare earth in the spinels chalcogenide MgCe2Z4 (Z = S, Se) for spintronic and thermo-electric applications

    Article • Materials Science in Semiconductor Processing, August 2023, Elsevier

    Dr. Hamid Ullah

  43. Electronic structure and optical and thermoelectric response of lead-free double perovskite BaMgLaBiO6: a first-principles study

    Article • Journal of Computational Electronics, July 2023, Springer Science + Business Media

    Dr. Hamid Ullah

  44. Defects mediated electronic and magnetic properties of monolayer Janus SnSSe

    Article • Materials Today Communications, June 2023, Elsevier

    Dr. Hamid Ullah

  45. Enhanced Device Absorption Efficiency and Photocatalytic Response of Monolayer PtX2 (X = S, Se, Te) for Photocatalysis and Solar Cell Applications

    Article • physica status solidi (b), May 2023, Wiley

    Dr. Hamid Ullah

  46. Exploring structural, electronic, magnetic, and optical properties of CeO2-X (X = Pt/Ni) doped and Pt-Ni co-doped CeO2 for optoelectronic applications

    Article • Physica Scripta, March 2023, Institute of Physics Publishing

    Dr. Hamid Ullah

  47. Bandgap tuning and thermoelectric characteristics of Sc-based double halide perovskites K2ScAgZ6 (Z = Cl, Br, I) for solar cells applications

    Article • Journal of Physics and Chemistry of Solids, March 2023, Elsevier

    Dr. Hamid Ullah

  48. Tuning of band gap by anion variation of double perovskites K2AgInX6 (X = Cl, Br) for solar cells and thermoelectric applications

    Article • Journal of Solid State Chemistry, March 2023, Elsevier

    Dr. Hamid Ullah

  49. DFT study of electronic, optical, and elastic properties of double perovskites Rb2YAgX6 (X = Br, I) compounds for opto-electronic device applications

    Article • Physica Scripta, February 2023, Institute of Physics Publishing

    Dr. Hamid Ullah

  50. An insight into the structural, electronic, magnetic and optical properties of Cs doped and Cs-X (X=Mn, Fe) co-doped CdS for optoelectronic applications

    Article • Solid State Sciences, January 2023, Elsevier

    Dr. Hamid Ullah

  51. Exploring the structural, electronic, optical, and thermoelectric properties of potassium-based double perovskites K2AgXI6 (X = Sb, Bi) compounds: A DFT study

    Article • Materials Science and Engineering B, January 2023, Elsevier

    Dr. Hamid Ullah

  52. Structural, optoelectronic and thermal response of new stable MgBe2X2 (X = As, P) Zintl phases: First-principles calculation

    Article • Materials Science and Engineering B, January 2023, Elsevier

    Dr. Hamid Ullah

  53. Structural, Electronic and Optical Properties of Titanium Based Fluoro-Perovskites MTiF3 (M = Rb and Cs) via Density Functional Theory Computation

    Article • ACS Omega, December 2022, American Chemical Society (ACS)

    Dr. Hamid Ullah

  54. Investigating structural, electronic, magnetic, and optical properties of Zr doped and Ti-Zr co-doped GaN for optoelectronic applications

    Article • Physica Scripta, December 2022, Institute of Physics Publishing

    Dr. Hamid Ullah

  55. Doping-dependent optoelectronic, and magnetic properties of monolayer SnS

    Article • Materials Science in Semiconductor Processing, December 2022, Elsevier

    Dr. Hamid Ullah

  56. Optoelectronic and photocatalytic properties of Mo-based Janus monolayers for solar cell applications

    Article • Optik, December 2022, Elsevier

    Dr. Hamid Ullah

  57. Optoelectronic and thermoelectric characteristics of lead-free halide based double perovskites Rb2GaInX6 (X = Cl, Br, I) for solar cell applications

    Article • Physica Scripta, October 2022, Institute of Physics Publishing

    Dr. Hamid Ullah

  58. Preparation of pH-Responsive Hydrogels Based on Chondroitin Sulfate/Alginate for Oral Drug Delivery

    Article • Pharmaceutics, October 2022, MDPI AG

    Dr. Hamid Ullah

  59. Strain modulated electronic and optical properties of laterally stitched MoSi2N4/XSi2N4 (X=W, Ti) 2D heterostructures

    Article • Physica E Low-dimensional Systems and Nanostructures, October 2022, Elsevier

    Dr. Hamid Ullah

  60. Janus MoSO and MoSSe Monolayers: A Promising Material for Solar Cells and Photocatalytic Applications

    Article • physica status solidi (b), September 2022, Wiley

    Dr. Hamid Ullah

  61. A computational insight of the lead‐free double perovskites Rb 2 AgSbCl 6 and Rb ...

    Article • International Journal of Energy Research, September 2022, Hindawi Publishing Corporation

    Dr. Hamid Ullah

  62. Investigating structural, electronic, magnetic, and optical properties of Co-doped and Co-X (X = Fe, Mn) co-doped MoS2 for optoelectronic applications

    Article • Journal of Molecular Modeling, September 2022, Springer Science + Business Media

    Dr. Hamid Ullah

  63. Electronic, optical, and thermoelectric investigations of Zintl phase AAg2Se2 (A=Sr, Ba) compounds: A first-principle approach

    Article • Journal of Solid State Chemistry, August 2022, Elsevier

    Dr. Hamid Ullah

  64. Exploring the structural stability, electronic and thermal attributes of synthetic 2D materials and their heterostructures

    Article • Applied Surface Science, July 2022, Elsevier

    Dr. Hamid Ullah

  65. Fabrication, characterization and toxicological evaluation of polyethylene glycol/sodium polystyrene sulfonate hydrogels for controlled delivery of Acetaminophen

    Article • Journal of Materials Research and Technology, July 2022, Elsevier

    Dr. Hamid Ullah

  66. Tuning of the electronic bandgap of lead-free double perovskites K2AgBiX6 (X = Cl, Br) for solar cells applications and their thermoelectric characteristics

    Article • Solar Energy, June 2022, Elsevier

    Dr. Hamid Ullah

  67. Correction to: Enhancing the electronic properties of the graphene-based field-effect transistor via chemical doping of KBr

    Article • Journal of Materials Science Materials in Electronics, May 2022, Springer Science + Business Media

    Dr. Hamid Ullah

  68. Exploring structural, electronic, optical, and magnetic properties of Os doped and Os-Mn/Ru co-doped GaN

    Article • Optik, May 2022, Elsevier

    Dr. Hamid Ullah

  69. Enhancing the electronic properties of the graphene-based field-effect transistor via chemical doping of KBr

    Article • Journal of Materials Science Materials in Electronics, April 2022, Springer Science + Business Media

    Dr. Hamid Ullah

  70. Highly stable binary composite of nickel silver sulfide ( NiAg 2 S ) synthesized using the hydrothermal approach for high‐performance supercapattery a...

    Article • International Journal of Energy Research, April 2022, Wiley

    Haseebul Hassan, Dr. Hamid Ullah

  71. Exploring structural, electronic, optical, magnetic, and thermoelectric properties of Pt doped and Pt-Cu/Au co-doped GaN

    Article • Physica Scripta, March 2022, Institute of Physics Publishing

    Dr. Hamid Ullah

  72. First principle study of band gap tuning in Cs2InSbX6 (X = Cl, Br, I) for optoelectronic and thermoelectric applications

    Article • Physica Scripta, February 2022, Institute of Physics Publishing

    Dr. Hamid Ullah

  73. Optoelectronics properties of Janus SnSSe monolayer for solar cells applications

    Article • Physica B Condensed Matter, January 2022, Elsevier

    Dr. Hamid Ullah

  74. Electro-Optic and Thermoelectric Response of Group Iii-Phosphides (Lip, Nap, and Kp) for Solar and Thermal Applications

    Article • SSRN Electronic Journal, January 2022, Elsevier

    Dr. Hamid Ullah

  75. Exploring the Structural Stability, Electronic and Thermal Attributes of Synthetic 2d Materials and Their Heterostructures

    Article • SSRN Electronic Journal, January 2022, Elsevier

    Dr. Hamid Ullah

  76. Preparation, Swelling, and Release Kinetics of Polyethylene Glycol-4000 Based Hydrogels for Controlled Drug Release

    Article • SSRN Electronic Journal, January 2022, Elsevier

    Dr. Hamid Ullah

  77. Recent advances in TMD interfaces with seamless contacts

    Article • Journal of Materials Chemistry C, January 2022, Royal Society of Chemistry

    Dr. Hamid Ullah

  78. Structural, electronic, magnetic and elastic properties of xenon-based fluoroperovskites XeMF3 (M = Ti, V, Zr, Nb) via DFT studies

    Article • RSC Advances, January 2022, Royal Society of Chemistry

    Dr. Hamid Ullah

  79. Usability Barriers for Elderly Users in Smartphone App Usage: An Analytical Hierarchical Process-Based Prioritization

    Article • Scientific Programming, December 2021, Hindawi Publishing Corporation

    Dr. Hamid Ullah

  80. Computational insights into optoelectronic and magnetic properties of V(III)-doped GaN

    Article • Journal of Solid State Chemistry, December 2021, Elsevier

    Dr. Hamid Ullah

  81. Investigating effect of different Hubbard values on the electronic structure, magnetic and optical properties of Ru doped GaN

    Article • Computational Condensed Matter, December 2021, Elsevier

    Dr. Hamid Ullah

  82. Theoretical investigation of Cs2InBiX6 (X = Cl, Br, I) double perovskite halides using first-principle calculations

    Article • Materials Science and Engineering B, December 2021, Elsevier

    Dr. Hamid Ullah

  83. DC‐GAN‐based synthetic X‐ray images augmentation for increasing the performance of EfficientNet for COVID‐19 detection

    Article • Expert Systems, October 2021, Wiley

    Dr. Hamid Ullah

  84. Comprehensive study of ferromagnetic MgNd2X4 (X = S, Se) spinels for spintronic and solar cells device applications

    Article • Ceramics International, October 2021, Elsevier

    Dr. Hamid Ullah

  85. Spin-polarized electromagnetic and optical response of full-Heusler Co2VZ (Z = Al, Be) alloys for spintronic application

    Article • The European Physical Journal Plus, October 2021, Springer Science + Business Media

    Dr. Hamid Ullah

  86. Moving toward a green revolution in Japan: Symmetric and asymmetric relationships among clean energy technology development investments, economic growth, and CO2 emissions

    Article • Energy & Environment, September 2021, SAGE Publications

    Dr. Hamid Ullah, Mr. Muntasir Murshed

  87. Analysis of ternary AlGaX2(X = As, Sb) compounds for opto-electronic and renewable energy devices using density functional theory

    Article • Physica Scripta, September 2021, Institute of Physics Publishing

    Dr. Hamid Ullah

  88. Electronic and optical response of HfO2: DFT calculations with Ti and Zr incorporation

    Article • Modern Physics Letters B, September 2021, World Scientific Pub Co Pte Lt

    Dr. Hamid Ullah

  89. First principle investigations of the structural, electronic, magnetic, and optical properties of GaN co-doped with carbon and gold (C–Au@GaN)

    Article • Computational Condensed Matter, September 2021, Elsevier

    Dr. Hamid Ullah

  90. A framework for modeling structural association among De‐Motivators of scaling agile

    Article • Journal of Software Evolution and Process, June 2021, Wiley

    Dr. Hamid Ullah

  91. Effects of gallium and arsenic substitution on the electronic and magnetic properties of monolayer SnS

    Article • Physica Scripta, May 2021, Institute of Physics Publishing

    Dr. Hamid Ullah

  92. Investigations on electronic structure, magnetic and optical properties of C and Ti co-doped zincblende GaN for optoelectronic applications

    Article • Optik, April 2021, Elsevier

    Dr. Hamid Ullah

  93. Synthesis, Characterization and Safety Evaluation of Sericin-Based Hydrogels for Controlled Delivery of Acyclovir

    Article • Pharmaceuticals, March 2021, MDPI AG

    Dr. Hamid Ullah

  94. Effect of Zn doping on electronic structure and optical properties zincblende GaN (A DFT + U insight)

    Article • Communications in Theoretical Physics, February 2021, Institute of Physics Publishing

    Dr. Hamid Ullah

  95. Enhanced out-of-plane electromechanical response of Janus ZrSeO

    Article • Physical Chemistry Chemical Physics, January 2021, Royal Society of Chemistry

    Dr. Hamid Ullah

  96. Highly ordered lead-free double perovskite halides by design

    Article • Journal of Materiomics, December 2020, Elsevier

    Dr. Hamid Ullah

  97. Meissner to ferromagnetic phase transition in la-decorated functionalized Nb2C MXene: an experimental and computational analysis

    Article • Nanotechnology, November 2020, Institute of Physics Publishing

    Dr. Hamid Ullah

  98. TiO2 Nanorod Array Conformally Coated with a Monolayer MoS2 Film: An Efficient Electrocatalyst for Hydrogen Evolution Reaction

    Article • ACS Applied Energy Materials, November 2020, American Chemical Society (ACS)

    Dr. Hamid Ullah

  99. Investigating structural, electronic and optical properties of CdS:Cr (A GGA and GGA+U study)

    Article • Solid State Sciences, October 2020, Elsevier

    Dr. Hamid Ullah

  100. Effect of Vanadium doping on optoelectronic and magnetic properties of wurtzite ZnS crystal

    Article • Optik, February 2020, Elsevier

    Dr. Hamid Ullah

  101. Ab initio study of optoelectronic and magnetic properties of Mn-doped ZnS with and without vacancy defects

    Article • Journal of Physics Condensed Matter, September 2019, Institute of Physics Publishing

    Dr. Hamid Ullah

  102. Vacancy- and substitutiondependent electronic and magnetic properties of monolayer SnS2

    Article • Journal of the American Ceramic Society, September 2019, Wiley

    Dr. Hamid Ullah

  103. Optoelectronic and magnetic properties of Mn-doped and Mn–C co-doped Wurtzite ZnS: a first-principles study

    Article • Journal of Physics Condensed Matter, July 2019, Institute of Physics Publishing

    Dr. Hamid Ullah

  104. Influences of vacancy and doping on electronic and magnetic properties of monolayer SnS

    Article • Journal of Applied Physics, August 2018, American Institute of Physics

    Dr. Hamid Ullah

  105. Switchable Polarization in Mn Embedded Graphene

    Article • Scientific Reports, March 2018, Springer Science + Business Media

    Dr. Hamid Ullah

  106. First-principles calculation on dilute magnetic alloys in zinc blend crystal structure

    Article • Journal of Magnetism and Magnetic Materials, July 2015, Elsevier

    Dr. Hamid Ullah

  107. Enhanced Physical and Thermal Performance of Expanded Graphite-Based Heat Sink for LED Radiator

    Article • Asian Journal of Chemistry, January 2015, Asian Journal of Chemistry

    Dr. Hamid Ullah

  108. Optoelectronic Properties, Elastic Moduli and Thermoelectricity of SrAlGa: An Ab Initio Study

    Article • Chinese Physics Letters, April 2014, Institute of Physics Publishing

    Dr. Hamid Ullah

  109. The structural, electronic and optical response of IIA–VIA compounds

    Article • Physica B Condensed Matter, February 2013, Elsevier

    Dr. Hamid Ullah