conferance-ana2

10DECEMBER / FRIDAY
10:00-20:00

11 DECEMBER / SATURDAY
10:00-18:00 

10 DECEMBER / FRIDAY
OPENING CEREMONY OF THE CONFERENCE
9.45-10.00 AM (GMT+3) (for Istanbul Time)

NUCLEAR ENERGY, NUCLEAR REACTIONS AND NUCLEAR REACTOR PHYSICS

10:00-10:15 PLENARY LECTURE:

‘APPLICATION OF NUCLEAR REACTION ANALYSIS IN SURFACE

AND INTERFACE CHARACTERIZATION’                 
   Prof.Dr. Ziyuan Liu

  Institute of Physical and Chemical Research (RIKEN), JAPAN

 

10:15-10:30 PLENARY LECTURE:

‘NUCLEAR REACTIONS AND STRUCTURE’

 

 Assist.Prof. Dr. Atef Ismail

 Department of Physics, Al–Azhar University, 71524 Assiut, EGYPT

 

10:30-10:45 PLENARY LECTURE:

‘NUCLEAR ENERGY AND SUSTAINABLE DEVELOPMENT: A BRIEF SURVEY’

 

 Assist. Prof. Dr. Sihem BENGHABRIT, H. MEHNANE, M. ADNANE

 University of Sciences and Technology Mohamed Boudiaf Oran, ALGERIA

 

10:45-11:00 PLENARY LECTURE:

‘SFR REACTORS AS THE 4TH GENERATION OF NUCLEAR POWER PLANTS: AN ENERGY APROACH’

 

    Dr. Alireza Pirmohamadi  

    University of Mohaghegh Ardabili, IRAN

 

11:00-11:15 PLENARY LECTURE:

‘INVESTIGATION OF THE NEUTRON INDUCED REACTION CROSS SECTION OF THE 165HO’

 

 Asiye Gurol, Prof. Dr. Ismail Hakki Sarpun

 Akdeniz University, TURKEY

 

11:15-11:30 PLENARY LECTURE:

‘SITU LEACHING METHOD FOR NON RADIOACTIVE RARE-EARTH MINERAL EXPLORATION AND PRODUCTION: A NEW PERSPECTIVE’

 

 a b Dr Amir Rostami, a Prof.Dr. Noorhana Yahya 

                                                                             aSpin Eight Nano Technologies Sdn. Bhd., 28, Persiaran Jelapang Maju 7, Kawasan  

Perindustrian Ringan Jelapang Maju, 30020, Ipoh, Perak, MALAYSIA

b Universiti Teknologi PETRONAS, Sri Iskandar, 32610, Perak, MALAYSIA

 

11:30-11:45 PLENARY LECTURE:

‘RELATIONSHIPS BETWEEN INDOOR AND SOIL GAS RADON CONCENTRATIONS AND TERRESTRIAL RADIOACTIVITY IN AFYONKARAHISAR’

 

 Prof. Dr. Hüseyin Ali Yalim

                Afyon Kocatepe University, TURKEY

 

11:45-12:00 PLENARY LECTURE:

‘‘IONISATION CROSS SECTIONS OF DIATOMIC MOLECULES BY ELECTRON IMPACT AT LOW ENERGY REGIME'

 

  Assoc.Prof.Dr. Zehra Nur Ozer

  Afyon Kocatepe University, Afyon Vocational School, Afyonkarahisar, TURKEY

NEW ADVANCED TECHNIQUES IN AEROSPAECE INDUSTRY

12:00-12:15 PLENARY LECTURE:

‘NEW SPACE, AND MEDICAL EQUIPMENTS’

 

    Dr. Kuang-Han Ke  

                                                                                Gran Systems Chairman, Taipei–Keelung Metropolitan area, Taipei, TAIWAN  

12:15-13:00 LUNCH                                                                                 


NUCLEAR
BATTERY APPLICATIONS AND ENERGY STORAGE

 13:00-13:15 PLENARY LECTURE:

‘NANOSTRUCTURED OXIDE SEMICONDUCTOR MATERIALS FOR BETAVOLTAIC DEVICES’

 

                                                                                Prof. Dr. Kaiying Wang 

                   University of South-Eastern Norway, NORWAY

 

13:15-13:30 PLENARY LECTURE:

‘NUCLEAR BATTERY: A SOURCE OF CARBON FREE ENERGY’

 

                                                                                Assoc. Prof. Dr. Mirza Khurram Baig  

                                                                                Universiti Teknologi PETRONAS, MALAYSIA

 

13:30-13:45 PLENARY LECTURE:

‘HYBRID NUCLEAR-RENEWABLE ENERGY SYSTEMS FOR SUSTAINABLE DEVELOPMENT: CURRENT STATUS AND FUTURE PROSPECTS’

 

   Indu Kumari a, Dr. Srikanth Ponnada b*

   aDepartment of Biotechnology, Chandigarh Group of Colleges, Landran, Mohali-140307, India.

   bDepartment of Engineering Chemistry, Andhra University College of Engineering (A), 

   Andhra Univ ersity, Visakhapatnam-530003, Mumbai, INDIA

 

13:45-14:00 PLENARY LECTURE:

‘LI-AIR BATTERIES’

 

    Dr. Muhammad Mushtaq  

                   Beijing University of Technology, CHINA

 

14:00-14:15 PLENARY LECTURE:

‘BIOMASS-DERIVED POLYMERIC BINDERS IN SILICON ANODES FOR BATTERY ENERGY STORAGE APPLICATIONS’

 

  Omer S. Task

  Istanbul University, Institute of Marine Science and Management, TURKEY

 

14:15-14:30 PLENARY LECTURE:

‘CATALYSIS FOR ENERGY STORAGE APPLICATIONS’

 

   Assoc. Prof. Dr. Neslihan Yuca Maltepe University, TURKEY

RADIATION SAFETY AND PROTECTION

14:30-14:45 PLENARY LECTURE:

‘RADON AND INDOOR RADON GAS MEASUREMENTS IN TURKEY’

 

 Dr. Nesli Bingoldag

 TENMAK NUKEN Radiation Measurement and Control Unit, TURKEY

 

14.45-15:00 PLENARY LECTURE:

‘PROTECTIVE TEXTILE ENHANCED WITH NANOCLAYS’

 

               Ecehan Aygul Gonul, Assoc. Prof. Dr. Birgul Benli

               Istanbul Technical University, TURKEY

                                                                                   15:00-15:15  BREAK

MICROELECTRONIC APPLICATIONS IN RADIATION AREA, FAILURE ANALYSIS ON MATERIALS

15:15-15:30 PLENARY LECTURE:

USE OF ACOUSTIC EMISSION PATTERN RECOGNITION TO IDENTIFY CORRELATION BETWEEN RUPTURE LIFETIME AND FAILURE MODE FOR STRESSED 2D-C/SIC UNDER OXIDATION CONDITIONS’

4Prof.Dr. Andy Augousti, Peng Lv1,2 , Leijiang Yao1 , Xiaofei Ma2 , Gang An2 , Guodong Bai3 Xiaoyan Tong1

1. Laboratory of Science and Technology on UAV, Northwestern Polytechnical University, Xi’an 710065, CHINA  

2. Xi'an Institute of Space Radio Technology, Xi’an 710100, CHINA  3. School of Aeronautics, Northwestern Polytechnical University,  Xi’an 710072, CHINA  

4 Faculty of Science, Engineering and Computing, Kingston University London, SW15 3DW UNITED KINGDOM

 

15:30-15:45 PLENARY LECTURE:

‘THE SOLAR UV RADIATIONS BY ON-SITE MONITORING APPLICATIONS’

 

   Dr. Oana Ulieru

   SITEX45 SRL Company, ROMANIA

 

15:45-16:00 PLENARY LECTURE:

‘ADVANCE MICROWAVE POWER METROLOGY’

 

   Dr. Murat Celep  

                  National Physical Laboratory, UNITED KINGDOM 

 

16:00-16:15 PLENARY LECTURE:

‘BANANA-PEEL DERIVED POROUS ACTIVATED CARBON FOR MICROWAVE ABSORPTION AT X-BAND FREQUENCY’

 

  Dr. Jemilat Yetunde Yusuf, Dr. Afza Shafi, Assoc.Prof. Hassan Soleimani

                 Universiti Teknologi PETRONAS, MALAYSIA

 

16:15-16:30 PLENARY LECTURE:

‘MODIFYING THE PARAMETERS OF ZNS THIN FILMS VIA IMPURITY DOPING’

 

                Assoc. Prof. Dr. Serco Serkis Yesilkaya  

                Yildiz Technial University, TURKEY

 

16:30-16:45 PLENARY LECTURE:

‘ELECTROMAGNETIC    RADIATION’

 

Dr. Nursev Erdogan ASELSAN, TURKEY

DEVELOPMENTS IN TRANSISTORS, SENSORS AND RADIATION AREA  

16:45-17:00 PLENARY LECTURE:

‘FABRICATION OF ORGANIC HETEROJUNCTION’

 

 Prof. Dr. Mostefa Abuahmed Benhaliliba

 Oran University of Sciences and Technology, ALGERIA

 

17:00-17:15 PLENARY LECTURE:

‘DUST EFFECT IN PHOTOVOLTAIC MODULES UNDER NATUREL SOILING EFFECT: A CASE STUDY OF ALGIERS WEATHER’

 

  Assist. Prof. Dr. Amina Chahtou 1, Hamza Merabet1, El Amin Kouadri Boudjelthia 1,  

  Hichem Hafdaoui 1, Nesreddine Belhaouas1

1 Centre de Développement des Energies Renouvelables, CDER, BP. 62 Route de l’Observatoire    Bouzareah, 16340 Alger, ALGERIA

 

17:15-17:30 PLENARY LECTURE:

‘COMPARISON OF YIELD OF GRAPHENE USING TWO DIFFERENT SULPHATE ELECTROLYTES’

 

 Assist. Prof. Dr. Zia Ur Rehman, Mohammad Ahmeda, Muti ur Rehmana, Madiha Sabeena

 Namal College Mianwali, aNamal Institute 30 km Talagang Road, Mianwali, 42250,  

 

 PAKISTAN

 

 

17:30-17:45 PLENARY LECTURE:

MATERIAL AND TRANSISTOR APPLICATIONS’

Assist. Prof. Dr. Selma Rabhi

University of Yahia Fares Medea, Constantine, ALGERIA

 

17:45-18:00 PLENARY LECTURE:

‘CONTACT ANGLE MEASUREMENT ON TEXTILE BASED THREADS SENSORS’

 

 Dr. Saima Qureshi

                 University of Novi Sad, SERBIA

 

NEW ADVANCED TECHNIQUES IN PHOTOVOLTAIC, SOLAR ENERGY APPLICATIONS

 

 

18:00-18:15 PLENARY LECTURE:

‘ADVANCED CHARACTERIZATION OF PHOTOVOLTAIC MATERIALS USING X-RAY PHOTOELECTRON SPECTROSCOPY’

 

 Dr. Charif Tamina,b,c, Assist. Prof. Dr. Denis Chaumont a Prof. Dr. Mohamed ADNANE b

              a Laboratoire Interdisciplinaire Carnot de Bourgogne (ICB), Université de Bourgogne Franche,  

             Dijon, FRANCE  

              b University of Sciences and Technology Mohamed Boudiaf Oran, ALGERIA

              c Institut des Nanotechnologies de Lyon Villeurbanne, FRANCE

 

18:15-18:30 PLENARY LECTURE:

‘MATERIAL FOR SOLAR ENERGY: EXTRACTION OF SILICON DIOXIDE FOR SOLAR GRADE SILICON’

 

 Asmaa Boualem1, Saad Hamzaoui1, Liviu Leontie2, Salvador Angel Gomez Lopera3

 1 Laboratory of Electronic Microscopy and Materials Science, Faculty of Physics, University of Science 

  and Technology Mohamed Boudiaf, El Mnaouar, BP 1505, Bie El Djir 31000, Oran, ALGERIA.

 2 Faculty of Physics. Alexandru Ioan Cuza UniversityIasi, ROMANIA

 3 Laboratory of Nanoparticles and Dispersion. Polytechnic University. Cartagena, SPAIN

 

18:30-18:45 PLENARY LECTURE:

‘SUITABLE AND ENVIRONMENTALLY THIN FILMS FOR PHOTOVOLTAIC TECHNOLOGY’

 

 Dr. Faten Belarbi

                Science et de la Technologie Oran, ALGERIA

 

STRUCTURAL DEVELOPMENTS IN POLYMERS AND RADIATION AREA                       

 

 

 

18:45-19:00 PLENARY LECTURE:

 ‘DOUBLE SLIT INTERFERENCE EFFECTS IN THE MOLECULAR CROSS SECTIONS’

 

  Assoc. Prof. Dr. Zehra Nur Ozer

  Afyon Kocatepe University,Afyon Vocational School, Afyonkarahisar, TURKEY

 

19:00-19:15 PLENARY LECTURE:

‘PRODUCTION AND CHARACTERIZATION OF THERMOPLASTIC ELASTOMER FOAMS BASED ON STYRENE-ETHYLENE-BUTYLENE-STYRENE (SEBS) RUBBER

 

AND POLYPROPYLENE’

Ceren Kıroğlu1, Prof. Dr. Nilgün Kızılcan1,2

  1Graduate School of Science, Engineering and Technology, Polymer Science  

    and Technology Department, Istanbul Technical University, 34469, Maslak, Istanbul, TURKEY

   1,2Istanbul Technical University, Faculty of Science, Department of Chemistry, 

   34469 Maslak, Istanbul, TURKEY

 

MICROSTRUCTURAL AND CRYSTALLOGRAPHIC TEXTURE EVOLUTION OF MATERIALS AND RADIATION AREA

 19:15-19:30 PLENARY LECTURE:

NUMERICAL RESEARCH ABOUT FOW CHARACTERISTICS AND POLLUTANT DISPERSION USING THREE RANS TURBULENCE CLOSURE MODELS’

          Dr. L. Ben Ramoul1 , A. Korichi1, C. Popa2, H. Zaidi3, G. Polidori2

         1 Laboratoire de Mécanique, Physique et Modélisation Mathématique, 

         Université de Médéa, Médéa, ALGERIA

         2 GRESPI EA 4694, University of Reims Champagne-Ardenne, 51687 Reims Cedex 2, FRANCE

         3 Laboratoire de recherche en Turbulence, Département Mécanique et Ingénierie Industrielle, 

            Université de Toronto, Toronto, CANADA

19:30-19:45 PLENARY LECTURE:

‘ENHNCEMENT MAGNETIC PROPERTIES OF Α-Fe2O3 NANOCATALYST DURING SYNTHESIS USING EXTERNAL MAGNETIC FIELD’

    Dr. Bilal Alqasem

                   Amman Arab University, JORDAN

 

 

19:45-20:00 PLENARY LECTURE:

‘THE ROLE OF 3D PRINTING TECHNOLOGY IN TISSUE ENGINEERING APPLICATIONS’

 

Dr. Songul Ulag , Assoc.Prof.Dr. Oğuzhan Gündüz 

                    Marmara University, TURKEY

 

 

 

 

11 DECEMBER / SATURDAY

NEW ADVANCED TECHNIQUES IN BIOMEDICAL ENGINEERING              

 

10:00-10:15 PLENARY LECTURE:

‘PETROLEUM MICROBIAL BIOTECHNOLOGY FOR ENERGY SUSTAINABILITY’

 

   a Dr. Menaka Ganeson , b Eswaran Padmanabhana  

   aPetroleum Research Fund, Universiti Teknologi PETRONAS, Seri Iskandar 32610, Perak,       MALAYSIA   

bDepartment of Geosciences, Faculty of Science and Information Technology, Universiti Teknologi PETRONAS, Sri Iskandar, 32610, Perak, MALAYSIA

 

10:15-10:30 PLENARY LECTURE:

‘ROLE OF ADVANCED MEDICAL IMAGING SYSTEMS IN THE DIAGNOSIS AND TREATMENT OF VARIOUS DISEASES’

 

 Dr. Shahla Azizi

                                                                             Amirkabir University of Technology - Tehran Polytechnic, IRAN

                                                             10:30-10:45 PLENARY LECTURE:

 

‘SPARK PLASMA SINTERING OF NOVEL COMPOSITES WITH UNIQUE PROPERTIES BY COMBINING UHTCS AND MAX PHASES’

 

 Assoc.Prof.Dr. Mehdi Shahedi Asl

 University of Mohaghegh Ardabili, IRAN

 

10:45-11:00 PLENARY LECTURE:

‘COMPARATIVE STUDY OF GAMMA-RAY ATTENUATION

 

IN POLY (IMIDE SILOXANE) BLOCK COPOLYMER FOR BIOMEDICAL APPLICATIONS’

Dr.Turkan Dogan

                                                                            Istanbul Technical University, TURKEY

 

 

        NANOMATERIAL & COMPOSITES FOR INDUSTRIAL APPLICATIONS 

12:00-12:15 PLENARY LECTURE:

 

‘ELABORATION of CuZnSnS THIN LAYERS BY THE SILAR METHOD’

 

  Bouchra BENMAZOUZA, Prof. Adnane Mohamed., Saad Hamzaoui

                 University of Sciences and Technology Mohamed Boudiaf Oran, ALGERIA

 

12:15-12:30 PLENARY LECTURE:

‘PROPERTIES AND APPLICATIONS OF ELECTROLESS NICKEL-BORON BASED COMPOSITE COATINGS’

 

  Mohammed Ba Dughaish  

                    The International Wars and Disasters Victims Protection Association, YEMEN 

12:30-13:15 LUNCH                                                                                  

ADVANCED AND FUNCTIONAL MATERIALS & THIN FILMS

 13:15-13:30 PLENARY LECTURE:

‘SOL-GEL THIN FILMS IN TERNARY SYSTEM TiO2-ZnO-B2O3 BY SPIN-COATING DEPOSITION’

 

                                                                          Prof. Dr. Bogdan Alexandru Sava

                                                                National Institute for Laser, Plasma and Radiation Physics, ROMANIA

                                                              13:30-13:45 PLENARY LECTURE:

 

‘METAL INJECTION MOLDING OF GRAFTED GRAPHENE REINFORCED COPPER

 

MATRIX COMPOSITES’                                                                        

                                                                         Prof. Dr. Faiz Ahmad  

                                                                              Universiti Teknologi PETRONAS, MALAYSIA 

                                               13:45-14:00 PLENARY  LECTURE:                                                                                        EFFECT OF WATRER UPTAKE PERFORMANCE OF PLA/FLAX FIBER GREEN COMPOSITES ON THE IMPACT BEHAVİOUR’

1 Ali Avci, 2Prof.Dr. Aysegul Akdogan Eker, 1Prof.Dr.Mustafa Bakkal, 3Assist.Prof.Dr. M.Safa Bodur

                                                                             1Istanbul Technical University, Istanbul, TURKEY

2Yildiz Technical University, Istanbul, TURKEY 3Yeditepe University, Istanbul, TURKEY

                                                               14:00-14:15 PLENARY LECTURE:                                                                                  

 

‘Al DOPED ZnO THIN FILMS’

 

 Mehdi Tonka1, Prof. Dr. Feyza Guzelcimen2, Prof. Dr. Nilgun Baydogan3 1Sirnak University, Sirnak Turkey

2Istanbul University, Istanbul, Turkey

                                                                            3Istanbul Technical University, TURKEY

 

14:15-14:30 PLENARY LECTURE:

‘OPTICAL PROPERTIES OF AL DOPED ZNO NANOWIRES PRODUCED BY HYDROTHERMAL GROWTH 

 

                                                                          Dr. Hale Tugral

                                                                               Istanbul Technical University, Istanbul, TURKEY     

                                               14:30-14:45 PLENARY LECTURE:                                                                                        

 

‘RADIATION EFFECT ON CIGS THIN FILM’

 

                                                                        Assist. Prof. Dr. Utku Canci Matur

                                                              Istanbul Gedik University, TURKEY

 

14:45-15:00 PLENARY LECTURE:

‘MANUFACTURING PROCESSES OF ZnO:Al THIN FILM DERIVED BY SOL-GEL PROCESS’

 

                                                                        Dr. Osman Urper

                                                                        University of South-Eastern Norway, NORWAY   

 

ADVANCED TECHNIQUES IN MARITIME SCIENCES

 

15:00-15:15 PLENARY LECTURE:                                                                                              

 

‘ADVANCED TECHNOLOGIES FOR UNDERWATER WIRELESS COMMUNICATION SYSTEMS’

 

                                                                        Assist. Prof. Dr. Muhammad Rauf

                                                                             Dawood University of Engineering and Technology, MALAYSIA

15:15-15:30 PLENARY LECTURE:                                                                                       

 

‘INVESTIGATION OF FLAME RETARDANCY PROPERTIES OFPOLYPROPYLENE-COLEMANITE AND IN LUMINESCENT FLAME RETARDANT ADDITIVE BLENDS’

 

                                                                        Merve Kahraman, Prof.Dr.Nilgun Kizilcan

                                                              Istanbul Technical University, TURKEY

15:30-15:45 PLENARY LECTURE:                                                                                  

 

‘NANOSILICA CONTAINING WATERBORNE POLY(URETHANE FOR PAPER COATING’

 

                                                                         Yunus Erkahraman, Assoc.Prof.Dr.Nesrin Koken

                                                               Istanbul Technical University, TURKEY

15:45-16:00  BREAK

RESEARCHES ON RARE EARTH MINERAL EXPLORATIONS

 16:00-16:15 PLENARY LECTURE:

              INVESTIGATION OF ULTRASONIC PROPERTIES OF NI-FE-B4C COMPOSITES PRODUCED IN DIFFERENT COMPOSITIONS

                                                                Assist. Prof. Dr. Vildan ÖZKAN BİLİCİ

    Afyon Kocatepe University, Faculty of Arts and Sciences, Department of Physics, 03200,    

    Afyonkarahisar, TURKEY

16:15-16:30 PLENARY LECTURE:                                                                                  

INVESTIGATION OF NEUTRON EMISSION SPECTRA OF 116,117,118,119,120,122,124Sn ISOTOPES INDUCED BY PROTON AT 7-11 MEV ENERGIES’

 Ali Onur Kaya , Prof.Dr.Ismail Hakkı Sarpun

                                                                             Akdeniz University, TURKEY

                                                     16:30-16:45 PLENARY LECTURE:                                                                                 

 

‘THE STUDY OF RADIATION SHIELDING PERFORMANCE FOR PMMA COLEMANITE COMPOSITE”

 

Shima Mehranpour Prof.Dr. Nilgun Baydogan  

                                                                             Istanbul Technical University, Energy Institute , Istanbul, TURKEY

 

16:45-17:00 PLENARY LECTURE:

‘INVESTIGATION OF THE REACTION RATE AND CROSS SECTION OF 181TA(alpha,n)184Re REACTION IN THE RANGE OF 10-30 MEV’

 

  Ercan Yıldız a , Prof. Dr. Ismail Hakkı Sarpün b,c and Selcan Şahin b  

  a Kahramanmaras Sutcu Imam University, Vocational School of Health Services Dept. of     

  Medical Imaging Tech., Kahramanmaras, TURKEY

  b Akdeniz University, Physics Department, Antalya, Turkey,Akdeniz University

  c Nuclear Sciences Research and Application Center, Antalya, TURKEY

 

17:00-17:15 PLENARY LECTURE:

‘SYNTHESIS OF PMMA/BORAX COMPOSITES TO IMPROVE GAMMA SHIELDING PROPERTIES’

 

   Fuat Berke Gul, Prof. Dr. Nilgun Baydogan  

                                                                               Istanbul Technical University, Energy Institute , Istanbul, TURKEY

 

17:15-17:30 PLENARY LECTURE:

‘INVESTIGATION OF BORON CARBIDE BEHAVIOR ON POLYMETHYLMETHACRYLIC’

 

                   Duygu Tuluk, Prof. Dr. Cuneyt Arslan, Prof. Dr. Nilgun Baydogan

                                                                                Istanbul Technical University, TURKEY

NUCLEAR TECHNOLOGICAL APPLICATIONS                                            
Mathematical Modelling, Numerical Methods, Experimental Methods, Industrial Applications 

17.30-17.45 PLENARY LECTURE:

‘NUCLEAR METEOROLOGY ANALYSIS’

Prof.Dr. Sevinç Sırdaş

Istanbul Technical University, Istanbul, TURKEY    

17:45-18:00 PLENARY LECTURE:

‘MONTE CARLO METHOD TO SIMULATE VIRTUAL SOURCE MODEL ON AN ELEKTA VERSA HD LINAC’

 Dr.Sümeyra Can, Prof.Dr.Niyazi Meric

 Ankara University, TURKEY

 

 

CLOSING CEREMONY OF THE CONFERENCE

Prof.Dr. Nilgün BAYDOĞAN
dogannil@itu.edu.tr

Dr. Türkan DOĞAN 
tdogan@itu.edu.tr
dgan.turkan@gmail.com