Chenyang Yuan | Environmental Materials| Best Researcher Award

Dr. Chenyang Yuan | Environmental Materials| Best Researcher Award

Dr. Chenyang Yuan, North China University of Water Resources and Electric Power,China

Dr. Chenyang Yuan is a lecturer at the School of Water Resources, North China University of Water Resources and Electric Power, China. He holds a Ph.D. in Disaster Prevention and Mitigation Engineering from Dalian University of Technology. His research focuses on intelligent vibration reduction control of large wind turbine structures, structural seismic vulnerability, concrete mechanical properties, and seismic safety assessment of gravity dams. He has led and participated in multiple national research projects and has published extensively in high-impact journals. Dr. Yuan is also a member of several professional engineering societies in China.

Profile

Scopus

Summary:

Dr. Chenyang Yuan is a highly accomplished researcher in structural and civil engineering, with a strong publication record, leadership in funded projects, and expertise in seismic safety and material mechanics. His interdisciplinary approach and contributions to sustainable construction and disaster resilience make him a strong candidate for a Best Researcher Award.

🎓 Education

Yuan Chenyang holds a Bachelor’s degree in Civil Engineering from North China University of Water Resources and Hydropower (2008-2012). He pursued his Master’s and Doctoral degrees in Disaster Prevention and Mitigation Engineering and Protection Engineering at Dalian University of Technology (2012-2017).

💼Experience

Since September 2018, Yuan Chenyang has been a lecturer at the School of Water Resources, North China University of Water Resources and Electric Power. From April 2019 to July 2020, he worked at the River and Lake Protection Center of the Ministry of Water Resources, focusing on river and lake supervision, shoreline protection, and river sand mining management.

🔬Research Focus

His research interests include intelligent vibration reduction control for large wind turbines, structural seismic vulnerability, concrete mechanical properties, seismic safety assessment of gravity dams, and the damage evolution law of large water transfer channels under extreme conditions.

 

🛠️Skills

His expertise lies in intelligent vibration reduction control of large wind turbine structures, structural seismic vulnerability research, concrete mechanical properties, and seismic safety assessment of gravity dams. He is proficient in structural mechanics, finite element analysis, and seismic safety evaluation techniques.

🏆Awards

Yuan Chenyang has received research grants, including the Henan Province Key R&D and Promotion Special Project and the Open Research Fund Project of the Key Laboratory of Water Engineering Construction and Safety of the Ministry of Water Resources. He has led and participated in multiple national key R&D projects.

Publications

  1. Study on the mechanical properties and mesoscopic damage mechanism of recycled aggregate concrete under different dynamic strain rates after freeze-thaw cycles

    • Authors: C. Yuan, Chenyang; S. Qu, Siying; W. Bai, Weifeng; J. Guan, Junfeng; Y. Xie, Yunfei
    • Year: 2025
    • Journal: Case Studies in Construction Materials
  2. Influence Mechanism of Mechanical Properties and Microscopic Damage in Natural Aggregate and Recycled Aggregate Concrete Containing Zeolite Powder

    • Authors: W. Bai, Weifeng; Y. Kang, Yong; C. Yuan, Chenyang; C. Xie, Chaopeng; L. Li, Lielie
    • Year: 2025
    • Journal: Journal of Materials in Civil Engineering
  3. Study on mechanical properties and damage mechanism of alkali-activated slag concrete

    • Authors: W. Bai, Weifeng; D. Ye, Deqian; S. Ye, Song; G. Yang, Guang; C. Xie, Chaopeng
    • Year: 2024
    • Journal: Journal of Building Engineering

Conclusion:

Dr. Yuan possesses the credentials and research impact necessary for consideration for the Best Researcher Award. While he has already made notable contributions, expanding his international collaborations, patent portfolio, and industry engagement would further solidify his position as a leading researcher in his field.

Muhammad Haseeb | Environmental Science | Young Scientist Award

Mr. Muhammad Haseeb | Environmental Science | Young Scientist Award

Mr. Muhammad Haseeb, University of the Punjab Lahore, Pakistan

Mr. Muhammad Haseeb is an environmental scientist and Visiting Lecturer at the University of the Punjab, Lahore, Pakistan. He holds an MPhil in Environmental Science from the University of Engineering and Technology, Lahore, and an MSc in Environmental Sciences from the University of the Punjab. His research focuses on air pollution modeling, carbon footprint analysis, and the application of remote sensing and GIS in environmental management. A recipient of the University Gold Medal, he has expertise in GIS, remote sensing, machine learning, and environmental sustainability.

Profile

Scopus

Summary:

Mr. Muhammad Haseeb is an accomplished young scientist with expertise in environmental science, remote sensing, and GIS. His academic achievements, research focus on air pollution and carbon footprint analysis, and technical proficiency make him a strong candidate for the Research for Young Scientist Award. His commitment to teaching and mentoring students further enhances his profile.

 

🎓 Education

Muhammad Haseeb holds an MPhil in Environmental Science from the University of Engineering and Technology, Lahore, with a strong academic record, earning a CGPA of 3.85/4.00. His thesis focused on developing a predictive model for air pollution and smog in Lahore, showcasing his expertise in environmental modeling and atmospheric studies. He also earned an MSc in Environmental Sciences from the University of the Punjab, where he achieved a CGPA of 3.92/4.00. His MSc research involved a quantitative analysis of the carbon footprint at the University of the Punjab, highlighting his skills in sustainability assessment and carbon accounting.

 

💼Experience

Currently serving as a Visiting Lecturer at the Department of Space Science, University of the Punjab, Muhammad Haseeb teaches courses on Remote Sensing, GIS, Meteorology, and Machine Learning, reflecting his dedication to education and research in geospatial sciences. Previously, he worked as a Remote Sensing and GIS Expert at Bit Bricks, where he played a key role in satellite image processing, flood mapping, vegetation analysis, and GIS project management. His experience includes advanced image processing techniques, such as radiometric and geometric corrections, supervised classification, and NDVI analysis for vegetation health assessment.

 

🔬Research Focus

Muhammad Haseeb’s research is centered on environmental modeling, air pollution prediction, carbon footprint analysis, and the application of remote sensing and GIS in environmental management. His work contributes to understanding urban air quality dynamics, sustainable land use planning, and climate change mitigation strategies, particularly in the context of Pakistan’s environmental challenges.

 

Awards 

His academic excellence has been recognized through several prestigious awards, including a University Gold Medal for securing the top position in his MSc Environmental Sciences program at the University of the Punjab. He also received a merit scholarship for two consecutive years for his outstanding performance. Additionally, he won the Environmental Chemistry Quiz Competition at the College of Earth and Environmental Sciences, further demonstrating his strong foundation in environmental sciences.

 

Skills

Muhammad Haseeb is proficient in geospatial technologies, including Google Earth Engine, ArcGIS, QGIS, and MATLAB, along with programming languages such as Python and R for machine learning applications. His expertise extends to environmental modeling, air pollution analysis, remote sensing, and GIS-based spatial analysis. He has also completed specialized training programs from the Asian Development Bank on sustainable development, climate change, and infrastructure.

 

Publications

  • Enhancing Carbon Sequestration through Afforestation: Evaluating the Impact of Land Use and Cover Changes on Carbon Storage Dynamics
    • Year: 2024
    • Authors: Haseeb, M., Tahir, Z., Mehmood, S.A., Abdullah-Al-Wadud, M., Tariq, A.
    • Journal: Earth Systems and Environment
    • Citations: 4

 

  • Comparative Analysis of Machine Learning Models for Predicting PM2.5 Concentrations Using Meteorological and Chemical Indicators
    • Year: 2024
    • Authors: Haseeb, M., Tahir, Z., Mahmood, S.A., Soufan, W., Tariq, A.
    • Journal: Journal of Atmospheric and Solar-Terrestrial Physics
    • Citations: 3

 

  • Evaluation of Land Use Land Cover Changes in Response to Land Surface Temperature With Satellite Indices and Remote Sensing Data
    • Year: 2024
    • Authors: Zhao, Q., Haseeb, M., Wang, X., Soufan, W., Almutairi, K.F.
    • Journal: Rangeland Ecology and Management
    • Citations: 6

 

  • Predicting Soil Erosion Risk Using the Revised Universal Soil Loss Equation (RUSLE) Model and Geo-Spatial Methods
    • Year: 2024
    • Authors: Naqvi, S.A.A., Tariq, A., Shahzad, M., Haseeb, M., Soufan, W.
    • Journal: Hydrological Processes
    • Citations: 4

 

  • Assessing Long-Term Variability and Trends in Temperature and Precipitation in Gilgit and Hunza River Basins
    • Year: 2024
    • Authors: Shazil, M.S., Mahmood, S.A., Ahmad, S., Qureshi, J., Batool, S.
    • Journal: Environmental Earth Sciences
    • Citations: 0

 

  • Assessment of Soil Erosion Dynamics and Implications for Sustainable Land Management: A Case Study Using the RUSLE Model (Article in Press, Open Access)
    • Year: 2024
    • Authors: Zhang, L., Haseeb, M., Tahir, Z., Almutairi, K.F., Soufan, W.
    • Journal: International Journal of Sediment Research
    • Citations: 0

 

  • Multi-Temporal Analysis of Urbanization-Driven Slope and Ecological Impact Using Machine-Learning and Remote Sensing Techniques (Article in Press)
    • Year: 2024
    • Authors: Hao, Z., Haseeb, M., Xiangtian, Z., Abdullah-Al-Wadud, M., El-Askary, H.
    • Journal: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
    • Citations: 0

 

Conclusion:

Given his academic excellence, research contributions, technical expertise, and recognition through awards, Mr. Muhammad Haseeb is a highly competitive candidate for the Research for Young Scientist Award. Strengthening his publication record, international collaborations, and research funding efforts would further enhance his standing for such prestigious honors.

Mustapha Najjari | Environmental Science | Best Researcher Award

Prof. Dr. Mustapha Najjari | Environmental Science | Best Researcher Award

 Prof. Dr. Mustapha Najjari, Faculté des Sciences Gabes, Tunisia

Prof. Dr. Mustapha Najjari is a distinguished professor at the Faculty of Sciences, University of Gabes, Tunisia. With expertise in physics, his research focuses on transport phenomena in porous media, PEM Fuel Cells, and renewable energy technologies. He has published over 40 national and international articles and contributed extensively to numerical modeling and fluid dynamics studies. In addition to his academic achievements, Dr. Najjari is actively involved in teaching, mentoring Ph.D. students, and serving on editorial boards and academic committees.

Profile

Scopus

Summary:

Prof. Dr. Mustapha Najjari is an exemplary candidate for the Best Researcher Award. His significant contributions to physics, particularly in the fields of renewable energy and fluid dynamics, position him as a leader in his field. His dedication to teaching, mentoring, and editorial activities further exemplify his commitment to academia. While there are opportunities to elevate his profile through enhanced citations, funding, and industry engagement, his track record demonstrates a strong foundation for recognition.

 

🎓 Education

He holds a Postdoctoral HDR (Habilitation à Diriger des Recherches) from the Faculty of Sciences, Tunis, focusing on flow in porous media and PEM Fuel Cells (2008). His Ph.D. in Physics (2002) addressed boiling in porous media, and he earned his Master’s degree in 1995 and a Bachelor’s degree in Physics in 1992.

 

💼Experience

Professor Najjari serves at the University of Gabes, Tunisia, and has been a part of the faculty since 1995, progressing from lecturer to professor. He has contributed significantly to research at the Laboratory of Processes, Energetics, Environment & Electrical Systems and other institutions. He has also been involved in national and international academic judging and distance learning initiatives.

 

🔬Research Focus

His research focuses on transport phenomena in porous media, PEM Fuel Cells, salt crystallization, and renewable energy technologies. He applies numerical modeling to investigate complex fluid dynamics, phase changes, and heat transfer in engineering and environmental contexts.

 

Awards

He has published over 40 national and international articles, reviewed for renowned journals like Springer and Elsevier, and contributed to the development of cutting-edge AI models for medical and engineering applications.

 

Skills

Mustapha Najjari is proficient in teaching advanced physics topics such as Statics, Dynamics, Electromagnetism, Fluid Mechanics, Thermodynamics, Optics, Waves, and Modern Physics. He has expertise in Numerical Methods, Fuel Cells, Hydrogen Storage, and Surface Physics. His research skills include numerical simulation, phase change analysis, and modeling in porous media, with notable computer proficiency in tools like Fortran, Pascal, MS Office, and specialized graphing software.

 

Publications

  • “Analytical Analysis of the Effects of the Porosity Distribution on Liquid–Water Management in the Cathode of a Polymer Electrolyte Membrane Fuel Cell”
    • Authors: F. Khemili, M. Najjari
    • Year: 2024
    • Citations: 0

 

  • “Recent advancements in enhancing the efficiency of solar energy systems through the utilization of ferrofluids and magnetic fields”
    • Authors: Z. Mehrez, W. Maaoui, M. Najjari
    • Year: 2024
    • Citations: 3

 

  • “Effects of the Porosity Distribution on Liquid–Water Transport in the Cathode of a PEMFC Fuel Cell” (Conference Paper)
    • Authors: F. Khemili, M. Najjari
    • Year: 2024
    • Citations: 0

 

  • “Extracting salt from soil with ceramic sheets”
    • Authors: F. Khemili, C. Gobaa, M. Najjari
    • Year: 2024
    • Citations: 0

 

  • “A web-based intelligent calculator for predicting viscosity of ethylene–glycol–based nanofluids using an artificial neural network model”
    • Authors: W. Maaoui, Z. Mehrez, M. Najjari
    • Year: 2024
    • Citations: 1

 

  • “Numerical Modeling of the Influence of Gas Diffusion Layer Properties on Liquid Water Transport and Transient Responses in a Proton Exchange Membrane Fuel Cell”
    • Authors: F. Khemili, M. Najjari
    • Year: 2023
    • Citations: 1

 

  • “Estimation of nanofluids viscosity using artificial neural network: application on the lubricant poly-alpha-olefin boron nitride”
    • Authors: W. Maaoui, Z. Mehrez, M. Najjari
    • Year: 2023
    • Citations: 1

 

  • “Artificial Intelligence-Enabled Wearable ECG for Elderly Patients” (Book Chapter)
    • Authors: N. Sakli, C. Baccouch, B.O. Soufene, S. Hedi, M. Najjari
    • Year: 2023
    • Citations: 3

 

  • “Dielectric Properties of Contaminated Soil by Salt Crystals”
    • Authors: W. Maaoui, F. Mezdari, M. Najjari
    • Year: 2023
    • Citations: 0

 

  • “Internet of Things (IoT) System with Matlab Interface for Multi-Patient ECG’s Monitoring” (Conference Paper)
    • Authors: N. Sakli, C. Baccouche, A. Zouinkhi, H. Sakli, M. Najjari
    • Year: 2022
    • Citations: 0

 

Conclusion:

Prof. Najjari is highly suitable for the Best Researcher Award. His impactful research, academic leadership, and dedication to addressing pressing global challenges align with the qualities of an outstanding researcher. Addressing the outlined areas for improvement could further enhance his candidacy in future evaluations.

 

 

 

 

 

 

 

Nader Akbari | Environmental Science | Young Scientist Award

 Dr. Nader Akbari | Environmental Science | Young Scientist Award

 Dr. Nader Akbari, Tehran University of Medical Sciences, Iran

Dr. Nader Akbari is a faculty member in the Department of Environmental Health, Food Safety Division, at the School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.

Profile

Google Scholar

Summary:

Dr. Akbari’s expertise in environmental health and food safety, paired with his consistent scholarly output and innovative research, makes him a strong candidate for the Research for Young Scientist Award. His contributions reflect a deep commitment to addressing public health and environmental challenges, aligning perfectly with the award’s objectives.

 

🎓 Education

Dr. Nader Akbari holds a B.Sc. in Food Industry from Tabriz University, Iran (2015), an M.Sc. in Food Safety and Hygiene from Isfahan University of Medical Sciences (2019), and is currently pursuing a Ph.D. in Food Safety and Hygiene at Tehran University of Medical Sciences.

 

💼Experience

He has served as a member of the Center for Inclusive Education Development (EDO) and the Central Council of the Educational Development Center (EDC) at Tehran University of Medical Sciences. Dr. Akbari has been a reviewer for the Journal of Food Safety and Hygiene and the Third National Conference on Food Safety and Hygiene, where he was also on the Executive Committee.

 

🔬Research Focus

Dr. Akbari’s research primarily explores food safety and hygiene, focusing on heavy metal contamination, carcinogenic compounds in food, aflatoxins, and food packaging safety. His systematic reviews and meta-analyses have addressed public health concerns related to food toxins and environmental health.

 

Awards

He has been recognized for poster presentations, such as analyzing heavy metal content in cosmetics and evaluating the nutritional quality of food. His educational contributions include designing an educational package on nutritional color indicators to promote healthier food choices.

 

Skills

Dr. Akbari possesses expertise in RNA and DNA extraction, PCR, cell culture, food analysis, heavy metal toxicity, environmental toxicology, and dairy technology. He is proficient in software tools like Microsoft Office, IBM SPSS, and EndNote, and has a strong ability to work in teams.

 

Publications

  • Molecular and technical aspects on the interaction of serum albumin with multifunctional food preservatives
    Authors: H. Mohammadzadeh-Aghdash, N. Akbari, K. Esazadeh, J.E.N. Dolatabadi
    Year: 2019
    Citations: 53

 

  • Influence of education on knowledge, attitude, and practices of students of Isfahan University of Medical Sciences to traffic light inserted on food labeling
    Authors: Z. Esfandiari, M.R. Marasi, F. Estaki, V. Sanati, E. Panahi, N. Akbari, et al.
    Year: 2019
    Citations: 23

 

  • Vitamin D levels in children with otitis media with effusion: a case-control study
    Authors: S. Hosseini, M. Khajavi, A. Eftekharian, N. Akbari
    Year: 2016
    Citations: 20

 

  • The amount and detection method of styrene in foods: A systematic review and meta-analysis
    Authors: P. Sadighara, N. Akbari, P. Mostashari, N. Yazdanfar, S. Shokri
    Year: 2022
    Citations: 10
  • Determination of heavy metals in municipal water network of Tehran, Iran: A health risk assessment with a focus on carcinogenicity
    Authors: E. Khanniri, S. Esmaeili, M.E. Akbari, E. Molaee-Aghaee, S. Sohrabvandi, et al.
    Year: 2023
    Citations: 9

 

  • Acrylamide; a neurotoxin in popcorns: a systematic review and meta-analysis
    Authors: A. Abedini, M.R. Zirak, N. Akbari, N.V. Saatloo, A. Badeenezhad, P. Sadighara
    Year: 2023
    Citations: 9

 

  • 4-Methylimidazole, a carcinogenic component in food, amount, methods used for measurement; a systematic review
    Authors: N. Akbari, H. Shafaroodi, M. Jahanbakhsh, S. Sabah, E. Molaee-Aghaee, et al.
    Year: 2023
    Citations: 6

 

  • Amplification, cloning and expression of Brucella melitensis bp26 gene (OMP28) isolated from Markazi province (Iran) and purification of Bp26 Protein
    Authors: H. Basiri, N. Akbari, M. Azizpour, S.D. Hosseini, A.M. Behrozikhah, et al.
    Year: 2013
    Citations: 6

 

  • Determination of melamine contamination in milk with various packaging: a risk assessment study
    Authors: K. Ghanati, H. Eghbaljoo, N. Akbari, Y. Mazaheri, S. Aghebat-Bekheir, et al.
    Year: 2023
    Citations: 5

 

  • Carcinogenic and non-carcinogenic risk assessment of lead in traditional and industrial canned black olives from Iran
    Authors: N. Shariatifar, S. Mohamadi, N. Akbari, E. Molaee-Aghaee, P. Sadighara, et al.
    Year: 2022
    Citations: 4

 

  • Effect of sesame oil extraction by traditional and cold press methods on total aflatoxin content
    Authors: N. Akbari, M. Sami, Z. Esfandiari, M.J. Tarrahi
    Year: 2021
    Citations: 3
  • Effectiveness of various methods to reduce aflatoxin M1 levels in milk, a systematic review
    Authors: Y. Mazaheri, P. Shavali-Gilani, N. Shariatifar, A. Bakhtiyari, Z. Hadian, et al.
    Year: 2024
    Citations: 2

 

  • The radionuclides contamination in eggs as an environmental marker: a systematic review
    Authors: P. Sadighara, A. Mohajer, E. Shamloo, N. Akbari, N. Vakili Saatloo
    Year: 2023
    Citations: 2

 

  • Sustainable health financing: Health-threatening products
    Authors: M. Sheikhy-Chaman, G.J. Khaniki, E. Molaee-Aghaee, N. Akbari, et al.
    Year: 2021
    Citations: 2

 

  • Assessment of students’ attitude and knowledge about food safety and hygiene in Isfahan University of Medical Sciences
    Authors: N. Akbari, S. Azami-Aghdash, Y. Sohraby-Silabi, D. Jafarzadeh, et al.
    Year: 2018
    Citations: 2

 

Conclusion:

Dr. Nader Akbari is highly suitable for the Research for Young Scientist Award due to his significant academic and societal contributions. While enhancing his global footprint and funding acquisitions could bolster his profile, his current achievements already establish him as a distinguished researcher in his field.

Dr. xiaohua Nasar | Environmental Science | Best Researcher Award

Dr. xiaohua Nasar | Environmental Science | Best Researcher Award

 Dr. Xiaohua Nasar, Nanjing Tech University, China

Dr. Xiaohua Zhang is a distinguished researcher at Nanjing Tech University, China, specializing in geotechnical engineering. Dr. Zhang holds a master’s degree from Lanzhou Jiaotong University and a doctoral degree from Nanjing University of Technology. His research focuses on post-grouting technologies, rockburst risk assessment, and tunnel safety. He has successfully led national-level projects and published extensively in high-impact journals. Dr. Zhang’s innovative contributions, such as enhancing the load-bearing capacity of cast-in-place piles and predicting tunnel rockburst risks, have significantly advanced engineering practices while improving safety and cost efficiency in infrastructure projects.

 

Profile

Scopus

Summary:

Dr. Xiaohua Zhang, a distinguished researcher at Nanjing Tech University, has made significant advancements in geotechnical engineering, particularly in post-grouting technologies and tunnel risk assessment. His leadership in national research projects, coupled with high-impact publications, has improved infrastructure practices by enhancing safety and economic efficiency. Dr. Zhang’s work stands out for its real-world applicability and measurable contributions to engineering innovation.

 

🎓 Education

Xiaohua Zhang earned a master’s degree from Lanzhou Jiaotong University and a doctoral degree from Nanjing University of Technology. During the master’s program, the focus was on reinforcement and the bearing mechanism of post-grouting drilled piles, while the doctoral research delved into tunnel rockburst mechanisms and risk prevention.

 

💼Experience

Xiaohua Zhang is currently affiliated with Nanjing Tech University and has been actively engaged in geotechnical engineering research. Zhang has undertaken significant national-level projects, including the Key Program of the National Natural Science Foundation of China.

 

🔬Research Focus

The primary research areas include geotechnical engineering, reinforcement of pile structures, and risk assessment in tunnels. Zhang’s innovative research on composite post-grouting technologies has been successfully implemented in various engineering projects.

 

Awards

Zhang’s work has earned recognition through funded national projects and publications in high-impact journals. The proposed technologies have directly contributed to saving economic costs in construction projects and improving safety standards.

 

Skills

Xiaohua Zhang specializes in geotechnical engineering, particularly in post-grouting technologies and tunnel risk analysis. Expertise includes predicting rockburst risks and improving the load-bearing capacity of cast-in-place piles, contributing to efficient and cost-effective engineering solutions.

 

Publications

  • Study on Vertical Bearing Characteristics of Composite Post Grouting Cast-in-Place Pile at Pile Bottom
    • Year: 2023
    • Authors: Zhang, X., Wang, X., Zhou, Y., Zhang, Y., Jiang, D.
    • Citations: 0

 

  • Composite Post Grouting at Pile Tip and Bearing Characteristics of Cast-in-Place Pile Foundation
    • Year: 2022
    • Authors: Zhou, Y.-L., Wang, X., Zhang, Y.-J., Gao, Y.-G., Ye, Y.-G.
    • Citations: 5

 

Conclusion:

Dr. Xiaohua Zhang’s expertise, research leadership, and impactful contributions to geotechnical engineering make him an excellent candidate for the Best Researcher Award. His innovative work has not only advanced theoretical understanding but also delivered practical solutions to infrastructure challenges. By addressing minor areas for improvement, such as fostering global collaborations and interdisciplinary approaches, Dr. Zhang can further solidify his position as a leading researcher in his field.  Dr. Zhang is a deserving recipient of the Best Researcher Award for his outstanding achievements and commitment to driving innovation in engineering research.