LabID-base/OpenAlex-Afillation huggingface dataset:
Synthetic messenger RNA vaccines and transcriptomic dysregulation: Evidence from new-onset adverse events and cancers post-vaccination
Year: 2025
Type: article
Language: en
Topic: RNA Interference and Gene Delivery
Authors and affiliations:
raw_author_name: Natalia Lidmar Von Ranke
raw_affiliation_strings: Development of R and D, Neo7Bioscience, Dallas, TX 75032, United States
raw_author_name: Wei Zhang
raw_affiliation_strings: Development of R and D, Neo7Bioscience, Dallas, TX 75032, United States
raw_author_name: Philipp Anokhin
raw_affiliation_strings: Development of R and D, Neo7Bioscience, Dallas, TX 75032, United States
raw_author_name: Nicolas Hulscher
raw_affiliation_strings: Department of Epidemiology, McCullough Foundation, Dallas, TX 75032, United States
raw_author_name: Kevin McKernan
raw_affiliation_strings: Development of R and D, Medicinal Genomics, Beverly, MA 01915, United States
raw_author_name: Peter Mccullough
raw_affiliation_strings: Development of R and D, McCullough Foundation, Dallas, TX 75032, United States
raw_author_name: John Catanzaro
raw_affiliation_strings: Development of R and D, Neo7Bioscience, Dallas, TX 75032, United States. john.catanzaro@neo7bioscience.com
Multifunctional phosphonium-based ionic liquid embedded polymer electrolyte for dual energy conversion and storage
Year: 2025
Type: article
Language: en
Topic: Advanced Battery Materials and Technologies
Authors and affiliations:
raw_author_name: Suneyana Rawat
raw_affiliation_strings: Centre of Excellence in Solar Cell and Renewable Energy, Department of Physics and Eni. Sci., SSES, Sharda University, Greater Noida, 201310, India
raw_author_name: Ram Chandra Singh
raw_affiliation_strings: Centre of Excellence in Solar Cell and Renewable Energy, Department of Physics and Eni. Sci., SSES, Sharda University, Greater Noida, 201310, India
raw_author_name: Monika Michalska
raw_affiliation_strings: Department of Chemistry and Physico-Chemical Processes, Faculty of Materials Science and Technology, VŠB-Technical University of Ostrava, 17. listopadu 2172/15, 708 00 Ostrava-Poruba, Czech Republic
raw_author_name: Serguei V. Savilov
raw_affiliation_strings: Department of Chemistry, Lomonosov Moscow State University, 1-3 Lenniskiye Gory, Moscow, Russia 119991
raw_author_name: Markus Diantoro
raw_affiliation_strings: Department of Physics, Faculty of Mathematics and Natural Science, Universiqtas Negeri Malang, Semarang 5, Malang 65145, Indonesia
raw_author_name: Pramod K. Singh
raw_affiliation_strings: Centre of Excellence in Solar Cell and Renewable Energy, Department of Physics and Eni. Sci., SSES, Sharda University, Greater Noida, 201310, India
How ethical leadership and green values influence green performance management and creativity? Evidence from firms in Saudi Arabia
Year: 2025
Type: article
Language: en
Topic: Environmental Sustainability in Business
Authors and affiliations:
raw_author_name: Mansoor Ahmad
raw_affiliation_strings: NUST Business School, National University of Sciences and Technology , ,
raw_author_name: Muhammad Zahid Iqbal
raw_affiliation_strings: National University of Modern Languages , ,
raw_author_name: Muhammad Mustafa Raziq
raw_affiliation_strings: University of Sharjah , ,
raw_author_name: Wali ur Rehman
raw_affiliation_strings: University of Essex , ,
raw_author_name: Sharjeel Saleem
raw_affiliation_strings: Lyallpur Business School, Government College University Faisalabad , ,
Multi-scale feature enhancement in multi-task learning for medical image analysis
Year: 2025
Type: article
Language: en
Topic: Advanced Neural Network Applications
Authors and affiliations:
raw_author_name: Phuoc-Nguyen Bui
raw_affiliation_strings: Convergence Research Institute, Sungkyunkwan University, Republic of Korea
raw_author_name: Duc-Tai Le
raw_affiliation_strings: Department of Electrical and Computer Engineering, Sungkyunkwan University, Republic of Korea
raw_author_name: Junghyun Bum
raw_affiliation_strings: College of Computing and Informatics, Sungkyunkwan University, Republic of Korea
raw_author_name: Jong Chul Han
raw_affiliation_strings: School of Medicine, Sungkyunkwan University, Republic of Korea; Department of Medical Device, Management and Research, SAIHST, Sungkyunkwan University, Republic of Korea; Department of Ophthalmology, Samsung Medical Center, Republic of Korea
raw_author_name: Van-Nguyen Pham
raw_affiliation_strings: Convergence Research Institute, Sungkyunkwan University, Republic of Korea
raw_author_name: Hyunseung Choo
raw_affiliation_strings: Convergence Research Institute, Sungkyunkwan University, Republic of Korea; Department of Electrical and Computer Engineering, Sungkyunkwan University, Republic of Korea; SKAI X, Republic of Korea. Electronic address: choo@skku.edu
Embedding Physics into Machine Learning: A Review of Physics Informed Neural Networks as Partial Differential Equation Forward Solvers
Year: 2025
Type: article
Language: en
Topic: Model Reduction and Neural Networks
Authors and affiliations:
raw_author_name: Wenhui Fan
raw_affiliation_strings: Department of Automation,CHINA. Tsinghua University, 100084,CHINA
raw_author_name: Xujia Chen
raw_affiliation_strings: Department of Automation,CHINA. Tsinghua University, 100084,CHINA
When is too small, too small? Evaluating the trade-offs of smaller dairy cows in pasture-based systems.
Year: 2025
Type: article
Language: en
Topic: Genetic and phenotypic traits in livestock
Authors and affiliations:
raw_author_name: D.P. Berry
raw_affiliation_strings: Teagasc, Animal & Grassland Research and Innovation Centre, Moorepark, Fermoy, Co. Cork, P61 P302, Ireland
raw_author_name: R.D. Evans
raw_affiliation_strings: Irish Cattle Breeding Federation, Link Road, Ballincollig, County Cork, P31 D452, Ireland
A framework for physical dominant dynamic mode decomposition mode selection of unsteady flows with rank stability
Year: 2025
Type: article
Language: en
Topic: Model Reduction and Neural Networks
Authors and affiliations:
raw_author_name: Chengyuan Wu
raw_affiliation_strings: National Key Laboratory of Aircraft Configuration Design 2 , Xi'an 710072,
School of Aeronautics, Northwestern Polytechnical University 1 , Xi'an 710072,
raw_author_name: Huachu Sun
raw_affiliation_strings: National Key Laboratory of Aircraft Configuration Design 2 , Xi'an 710072,
School of Aeronautics, Northwestern Polytechnical University 1 , Xi'an 710072,
raw_author_name: Shun He
raw_affiliation_strings: National Key Laboratory of Aircraft Configuration Design 2 , Xi'an 710072,
School of Aeronautics, Northwestern Polytechnical University 1 , Xi'an 710072,
Riemann solutions of nonhomogeneous generalized Chaplygin gas Euler equations of compressible fluid flow modeling acoustic generation and their limiting behaviors
Year: 2025
Type: article
Language: en
Topic: Navier-Stokes equation solutions
Authors and affiliations:
raw_author_name: Shiwei Li
raw_affiliation_strings: College of Science, Henan University of Engineering, Zhengzhou 451191, People's Republic of China
raw_author_name: Meiyan Cong
raw_affiliation_strings: College of Science, Henan University of Engineering, Zhengzhou 451191, People's Republic of China
From Wall Street to Dalal Street: tracing fear's path through quantile connectedness approach
Year: 2025
Type: article
Language: en
Topic: Market Dynamics and Volatility
Authors and affiliations:
raw_author_name: Neenu Chalissery
raw_affiliation_strings: Farook College Department of Commerce, , ,
Rajagiri College of Social Sciences Department of Commerce and Professional Studies, , ,
raw_author_name: T. Mohamed Nishad
raw_affiliation_strings: Farook College , ,
raw_author_name: J.A. Naushad
raw_affiliation_strings: Farook College , ,
Numerical analysis of uncertainty propagation in short fiber-reinforced composites: From injection molding to material testing
Year: 2025
Type: article
Language: en
Topic: Composite Material Mechanics
Authors and affiliations:
raw_author_name: Nicolas Christ
raw_affiliation_strings: Fraunhofer Institute for Mechanics of Materials IWM, 79108, Freiburg, Germany
raw_author_name: Florian Wittemann
raw_affiliation_strings: Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
raw_author_name: Benedikt Rohrmüller
raw_affiliation_strings: Fraunhofer Institute for Mechanics of Materials IWM, 79108, Freiburg, Germany
raw_author_name: Jörg Hohe
raw_affiliation_strings: Fraunhofer Institute for Mechanics of Materials IWM, 79108, Freiburg, Germany
raw_author_name: Luise Kärger
raw_affiliation_strings: Karlsruhe Institute of Technology, 76131, Karlsruhe, Germany
raw_author_name: Carla Beckmann
raw_affiliation_strings: Fraunhofer Institute for Mechanics of Materials IWM, 79108, Freiburg, Germany
Combined toxicity of polyethylene micro/nanoplastics and PFOA in zebrafish (Danio rerio): Impacts on antioxidant, neurotransmission, and gut microbiota
Year: 2025
Type: article
Language: en
Topic: Microplastics and Plastic Pollution
Authors and affiliations:
raw_author_name: Xia Wang
raw_affiliation_strings: Department of Environmental Science and Engineering, School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
raw_author_name: Ruixuan Li
raw_affiliation_strings: Department of Environmental Science and Engineering, School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
raw_author_name: Bo Cheng
raw_affiliation_strings: Key Laboratory of Aquatic Product Quality and Safety Control, Ministry of Agriculture, Chinese Academy of Fishery Sciences, Beijing 100141, China
raw_author_name: Yingxue Sun
raw_affiliation_strings: Department of Environmental Science and Engineering, School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
raw_author_name: Xiaolong Yao
raw_affiliation_strings: Department of Environmental Science and Engineering, School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, China
raw_author_name: Chun Wang
raw_affiliation_strings: Department of Environmental Science and Engineering, School of Light Industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, China. Electronic address: chun_wang@btbu.edu.cn
Pancreatic steatosis is not associated with advanced steatohepatitis or fibrosis in metabolic dysfunction-associated steatotic liver disease
Year: 2025
Type: article
Language: en
Topic: Liver Disease Diagnosis and Treatment
Authors and affiliations:
raw_author_name: Gabriel Heymann
raw_affiliation_strings: Department of Medicine, Bridgeport Hospital, Yale New Haven Health, Bridgeport, CT 06606, United States
raw_author_name: Saumik Rahman
raw_affiliation_strings: Department of Radiology & Biomedical Imaging, Yale University School of Medicine, New Haven, CT 06510, United States
raw_author_name: Daniel Kats
raw_affiliation_strings: Department of Medicine, Brown University, Providence, RI 02912, United States
raw_author_name: Bubu A Banini
raw_affiliation_strings: Section of Digestive Diseases, Department of Internal Medicine, Yale School of Medicine, New Haven, CT 06510, United States
raw_author_name: Srinivas Gaddam
raw_affiliation_strings: Karsh Division of Gastroenterology and Hepatology, Cedars-Sinai Medical Center, Los Angeles, CA 90048, United States
raw_author_name: Elise Aslanian
raw_affiliation_strings: Section of Digestive Disease, Yale School of Medicine, New Haven, CT 06510, United States
raw_author_name: Sarpong Boateng
raw_affiliation_strings: Department of Medicine, Bridgeport Hospital, Yale New Haven Health, Bridgeport, CT 06606, United States
raw_author_name: Gary Israel
raw_affiliation_strings: Department of Radiology & Biomedical Imaging, Yale University School of Medicine, New Haven, CT 06510, United States
raw_author_name: Thiruvengadam Muniraj
raw_affiliation_strings: Department of Medicine, Yale University School of Medicine, New Haven, CT 06520, United States. thiruvengadam.muniraj@yale.edu
Imaging of appendicitis: Computed tomography, magnetic resonance imaging, and ultrasound in diagnosis and management
Year: 2025
Type: article
Language: en
Topic: Appendicitis Diagnosis and Management
Authors and affiliations:
raw_author_name: Arosh S Perera Molligoda Arachchige
raw_affiliation_strings: Emergency Service, GHOL-Hopital de Nyon, Nyon 1260, Vaud, Switzerland
raw_author_name: Ana Claudia Teixeira de Castro Gonçalves Ortega
raw_affiliation_strings: Faculty of Medicine, Humanitas University, Pieve Emanuele 20072, Milan, Italy
raw_author_name: Gabriel Amorim Moreira Alves
raw_affiliation_strings: Faculty of Medicine, Humanitas University, Pieve Emanuele 20072, Milan, Italy. gabriel.alves@st.hunimed.eu
Chemically Tailored Organic Ammonium Salts for Integrated Regulation of CsPbI <sub>3</sub> Perovskite Solar Cells
Year: 2025
Type: article
Language: en
Topic: Perovskite Materials and Applications
Authors and affiliations:
raw_author_name: Hui Shen
raw_affiliation_strings: College of Physics, Guizhou Province Key Laboratory for Photoelectric Technology and Application Guizhou University Guiyang China
raw_author_name: Xiu Gong
raw_affiliation_strings: College of Physics, Guizhou Province Key Laboratory for Photoelectric Technology and Application Guizhou University Guiyang China
raw_author_name: Yonghao Yang
raw_affiliation_strings: College of Physics, Guizhou Province Key Laboratory for Photoelectric Technology and Application Guizhou University Guiyang China
raw_author_name: Haozhe Zhang
raw_affiliation_strings: College of Physics, Guizhou Province Key Laboratory for Photoelectric Technology and Application Guizhou University Guiyang China
raw_author_name: Xingting Wen
raw_affiliation_strings: Key Laboratory of Materials Physics of Ministry of Education, School of Physics Zhengzhou University Zhengzhou China
raw_author_name: Yunlong Li
raw_affiliation_strings: Key Laboratory of Materials Physics of Ministry of Education, School of Physics Zhengzhou University Zhengzhou China
raw_author_name: Xiaosi Qi
raw_affiliation_strings: College of Physics, Guizhou Province Key Laboratory for Photoelectric Technology and Application Guizhou University Guiyang China
raw_author_name: Jibin Zhang
raw_affiliation_strings: Faculty of Informatics and Engineering The University of Electro‐Communications Chofu Japan
Key Laboratory of Materials Physics of Ministry of Education, School of Physics Zhengzhou University Zhengzhou China
Silane-functionalized carbon dots for full-spectrum white light-emitting diodes
Year: 2025
Type: article
Language: en
Topic: Carbon and Quantum Dots Applications
Authors and affiliations:
raw_author_name: Junkai Ren
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
raw_author_name: Hongchen He
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
raw_author_name: Peijun Zhang
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
raw_author_name: Zhuolin Liu
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
raw_author_name: Decai Xiong
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
raw_author_name: Jiaolong Liu
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
raw_author_name: Dan Qu
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
raw_author_name: Bing Wei
raw_affiliation_strings: School of Physics, Xidian University, No. 2 Taibai South Road, Xi’an 710071, China
Contrasting Chemical Kinetic Parameters for Near In‐Service‐Temperature Aging and High‐Temperature Thermal Decomposition of Triaminotrinitrobenzene Formulations
Year: 2025
Type: article
Language: en
Topic: Energetic Materials and Combustion
Authors and affiliations:
raw_author_name: Patrick G. Campbell
raw_affiliation_strings: Materials Science Division Lawrence Livermore National Laboratory  Livermore California USA
raw_author_name: Steven A. Hawks
raw_affiliation_strings: Materials Science Division Lawrence Livermore National Laboratory  Livermore California USA
raw_author_name: Alan K. Burnham
raw_affiliation_strings: Stratify/MH Chew Associates  Livermore California USA
raw_author_name: Keith R. Coffee
raw_affiliation_strings: Materials Science Division Lawrence Livermore National Laboratory  Livermore California USA
raw_author_name: Jason A. Olivas
raw_affiliation_strings: Materials Science Division Lawrence Livermore National Laboratory  Livermore California USA
raw_author_name: John Selinsky
raw_affiliation_strings: Materials Science Division Lawrence Livermore National Laboratory  Livermore California USA
raw_author_name: Gregory W. Nyce
raw_affiliation_strings: Materials Science Division Lawrence Livermore National Laboratory  Livermore California USA
Mechanistic insights into drying methods: how they govern the structure and bioactivity of resveratrol-HP-β-CD inclusion complexes
Year: 2025
Type: article
Language: en
Topic: Drug Solubulity and Delivery Systems
Authors and affiliations:
raw_author_name: Adilah Marwa
raw_affiliation_strings: Faculty of Pharmacy, University of Indonesia, Depok, West Java, Indonesia
raw_author_name: Anton Bahtiar
raw_affiliation_strings: Faculty of Pharmacy, University of Indonesia, Depok, West Java, Indonesia
raw_author_name: Ahmad Fuad Shamsuddin
raw_affiliation_strings: Faculty of Pharmacy and Health Sciences, Royal College of Medicine Perak, Universiti Kuala Lumpur (RCMP UniKL), Ipoh, Perak, Malaysia
raw_author_name: Ariawan Gunadi
raw_affiliation_strings: Department of Pharmacy, Institute of Tarumanagara, South Jakarta, Indonesia
raw_author_name: Witta Kartika Restu
raw_affiliation_strings: Research Center for Chemistry, National Research and Innovation Agency (BRIN), Serpong, Indonesia
raw_author_name: Mahdi Jufri
raw_affiliation_strings: Faculty of Pharmacy, University of Indonesia, Depok, West Java, Indonesia
Curvature-induced oxygen reduction activity regulation of asymmetric CoN2O2 catalytic sites in covalent organic polymers
Year: 2025
Type: article
Language: en
Topic: Electrocatalysts for Energy Conversion
Authors and affiliations:
raw_author_name: Xuehuan Zhang
raw_affiliation_strings: Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
Institute for Carbon-Based Thin Film Electronics, Peking University, Shanxi (ICTFE-PKU), Taiyuan 030012, China
Institute of Molecular Science, Key Laboratory of High-Performance Energy Storage Materials and Systems of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China
raw_author_name: Xinrui Zhang
raw_affiliation_strings: Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
Institute for Carbon-Based Thin Film Electronics, Peking University, Shanxi (ICTFE-PKU), Taiyuan 030012, China
Institute of Molecular Science, Key Laboratory of High-Performance Energy Storage Materials and Systems of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China
raw_author_name: Xiaoxiong Li
raw_affiliation_strings: Institute for Carbon-Based Thin Film Electronics, Peking University, Shanxi (ICTFE-PKU), Taiyuan 030012, China
Institute of Molecular Science, Key Laboratory of High-Performance Energy Storage Materials and Systems of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China
raw_author_name: Gaoyi Han
raw_affiliation_strings: Institute for Carbon-Based Thin Film Electronics, Peking University, Shanxi (ICTFE-PKU), Taiyuan 030012, China
Institute of Molecular Science, Key Laboratory of High-Performance Energy Storage Materials and Systems of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China
raw_author_name: Sheng Zhu
raw_affiliation_strings: Institute for Carbon-Based Thin Film Electronics, Peking University, Shanxi (ICTFE-PKU), Taiyuan 030012, China
Institute of Advanced Functional Materials and Devices, Shanxi University, Taiyuan 030031, China
Institute of Molecular Science, Key Laboratory of High-Performance Energy Storage Materials and Systems of Shanxi Province, Key Laboratory of Chemical Biology and Molecular Engineering of Education Ministry, Shanxi University, Taiyuan 030006, China
raw_author_name: Yan Li
raw_affiliation_strings: Beijing National Laboratory for Molecular Science, Key Laboratory for the Physics and Chemistry of Nanodevices, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
Institute for Carbon-Based Thin Film Electronics, Peking University, Shanxi (ICTFE-PKU), Taiyuan 030012, China
Geological Controls on Natural Pre-Concentration in Mineral Deposits: Case Study of Gramalote and Telfer West Dome
Year: 2025
Type: article
Language: en
Topic: Mineral Processing and Grinding
Authors and affiliations:
raw_author_name: Nathaly Guerrero
raw_affiliation_strings: Centre for Ore Deposit and Earth Sciences (CODES), University of Tasmania, Hobart, TAS 7000, Australia
raw_author_name: Julie Hunt
raw_affiliation_strings: Centre for Ore Deposit and Earth Sciences (CODES), University of Tasmania, Hobart, TAS 7000, Australia
raw_author_name: Matthew J. Cracknell
raw_affiliation_strings: Centre for Ore Deposit and Earth Sciences (CODES), University of Tasmania, Hobart, TAS 7000, Australia
raw_author_name: Luke Keeney
raw_affiliation_strings: CRC ORE (Cooperative Research Centre for Optimising Resource Extraction), Pullenvale, QLD 4069, Australia
An updated microphysical model for particle activation in contrails: the role of volatile plume particles
Year: 2025
Type: article
Language: en
Topic: Advanced Aircraft Design and Technologies
Authors and affiliations:
raw_author_name: Joel Ponsonby
raw_affiliation_strings: Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
raw_author_name: Roger Teoh
raw_affiliation_strings: Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
raw_author_name: Bernd Kärcher
raw_affiliation_strings: Institute for Atmospheric Physics, DLR Oberpfaffenhofen, Weßling, Germany
raw_author_name: Marc E. J. Stettler
raw_affiliation_strings: Department of Civil and Environmental Engineering, Imperial College London, London, SW7 2AZ, United Kingdom
Evaluating land use impacts on soil organic carbon and soil health for sustainable land management in Ghana
Year: 2025
Type: article
Language: en
Topic: Soil Carbon and Nitrogen Dynamics
Authors and affiliations:
raw_author_name: Thomas Abindaw
raw_affiliation_strings: Department of Land Management, University of Energy and Natural Resources, Sunyani, Ghana. Electronic address: abindaw111@gmail.com
raw_author_name: Samuel Kumi
raw_affiliation_strings: Department of Environmental Management, University of Energy and Natural Resources, Sunyani, Ghana
raw_author_name: Michael Asigbaase
raw_affiliation_strings: Department of Forest Science, University of Energy and Natural Resources, Sunyani, Ghana
raw_author_name: Caleb Mensah
raw_affiliation_strings: Department of Atmospheric and Climate Science, School of Geosciences, University of Energy and Natural Resources, Sunyani, Ghana