Speakers

Osman Adiguzel, Speaker at Materials Science Conferences

Vistasp M Karbhari

University of Texas Arlington, United States

Ravi Kikar Sinha, Speaker at Materials Science and Engineering Congress

Randall Kelton

Texas Christian University, United States

Jerzy Kisilowski

Kazimierz Pulaski University of Technology and Humanities in Radom, Poland

Rafal Kowalik, Speaker at Materials Science and Engineering Congress

Vasily Lutsyk

Institute of Physical Materials Science SB RAS, Russian Federation

Eric Buhler, Speaker at Materials Science Conferences

Yarub Al Douri

University of Sharjah, United Arab Emirates

Daining Fang

Beijing Institute of Technology, China

View All Speakers

Past Conference Information

Upcoming Materials Science Conferences:

Event Name	Dates	Venue
6th Edition of International Conference on Materials Science and Engineering	March 18-20, 2024	Singapore
7th Edition of International Conference on Materials Science and Engineering	October 28-30, 2024	Baltimore, MD, USA

Magnus Group successfully hosted the "4th Edition of International Conference on Materials Science and Engineering" (MATERIALS 2023) during the month of March 13-15, 2023 as a virtual event.

The congress, that focused on the overarching topic of "Shaping Future by Combining Knowledge and Innovations in Material Science," was an enormous success and included eminent keynote speakers from a range of prominent organisations and universities. We would like to express our sincere gratitude to all of the prominent guests and keynote speakers who helped make MATERIALS 2023 a success by participating in the numerous scientific sessions and plenary speeches.
In a series of lectures delivered by distinguished experts, the most recent trends, issues, and technological advancements in the fields of materials science and engineering were reviewed.

4th Edition of International Conference on Materials Science and Engineering Report:

Keynote Presentations:

Leelakrishna Reddy, University of Johannesburg, South Africa

Title: A review of narrow band ultraviolet -B light emissions in Gd3+ activated phosphor host materials

Lidia Benea, Dunarea de Jos University of Galati, Romania

Title: Improving the surface properties of materials and biomaterials by electrochemical methods

Thomas Webster, Interstellar Therapeutics, United States

Title: Nano implants: Human clinical success in the spine

Ephraim Suhir, Portland State University, United States

Title: Avoiding low cycle fatigue conditions in solder material of IC packages

Bala Vaidhyanathan, Loughborough University, United Kingdom

Title: 2D/3D Manufacture of advanced ceramics for demanding applications

Fiqiri Hodaj, University of Grenoble Alpes, France

Title: Joining of ceramic materials by brazing: Relations between wetting, reactivity and interface microstructure

Dror Malka, Holon Institute of Technology, Israel

Title: Combining SiN MMI waveguides based on slot waveguide technology

Osman Adiguzel, Firat University, Turkey

Title: Lattice reactions governing reversibility and pseudoelasticity in shape memory alloys

Yarub Al Douri, American University of Iraq Sulaimani, Iraq

Title: Engineering applications of nanotechnology

Oral Presentations:

Masahiro Ikeda, National Institute of Technology, Japan

Title: Mechanism of ionic conduction in AgI-based superionic conducting glasses: A relation between charge

Adriel Tan Yan Sheng, University of Nottingham, Malaysia

Title: Titanium carbide: A new 2D material for photoelectrochemical biosensors

Joanna Wycislik Sosnierz, Upper Silesian Institute of Technology, Poland

Title: Fume hazard during laser and hybrid welding of stainless steel

Soban Muddassir Dar, Jiangsu University, China

Title: External fields assisted synthesis of high performance aluminum matrix composites

Bing Bai, Beijing Jiaotong University, China

Title: Cotransport of heavy metals and suspended particles at different temperatures by seepage in porous materials

Roberta Cappabianca, Politecnico di Torino, Italy

Title: Towards a more rational design of polymer-based coating of gold nanoparticles

Khalid Sultan, Central University of Kashmir, India

Title: Oxygen vacancies based modifications in properties of Sr doped Nd2NiMnO6

Chandan Maity, Vellore Institute of Technology, India

Title: Control over self-assembly towards smart material formation

Yogesh Kumar Sharma, Pt. L.M.S.Sri Dev Suman Uttarakhand University Campus, India

Title: Spectroscopic analysis of rare earth ions doped nanomaterial

Thangavel Ponrasu, Indian Institute of Technology Madras, India

Title: Jelly fig polysaccharide based biocompatible hydrogel loaded with lauric acid for wound tissue regeneration: An in vitro study

Saman Momeni, Sharif University of Technology, Iran

Title: Damped response of sandwich composite structures integrated with MR fluid under Impulse loading

Samy Abdel Hakim Abdel Hamid Elsayed, Beni Suef University, Egypt

Title: Inside the electron, a tentative theory about the electron nature

Diogo Santos, Instituto Superior Tecnico, Portugal

Title: Polyoxometalates as electrocatalysts for rechargeable metal-air batteries

Francisco J Pallares, ICITECH Universitat Politecnica de Valencia, Spain

Title: Seismic isolator for masonry infills to reduce dynamic interaction with RC frames and steps towards a more environmental friendly design

Maoyan Wang, University of Electronic Science and Technology of China, China

Title: Probing chiral biomolecules based on a surface plasmon resonance sensor

Ji Young Shin, Nagoya University, Japan

Title: Exploration of secondary batteries with porphyrinoid electrode materials

Palivan Cornelia, University of Basel, Switzerland

Title: Clusters of catalytic bio-nanocompartments for applications in biomedicine

Marianna Rotilio, University of L Aquila, Italy

Title: Smart and green panels for energy transition

Bernard Laurent, CEA Grenoble, France

Title: Thermotropic ionic liquid crystals: Self-assembled single-ion conductors for lithium batteries

Michal Urbanczyk, Lukasiewicz Resarch Network Institute of Welding, Poland

Title: The welding of two-layer (composite) tubes with the use of laser technology

Aluri Sai Sree Sarayu, Chaitanya Bharathi Institute of Technology, India

Title: General processing characteristics of low temperature co-fired ceramic (LTCC) technology and the creation of 3-D structures for micro-fluidic devices

Andreu Martinez Hernandez, University General Hospital of Castellon, Spain

Title: Stent management of leaks after bariatric surgery: A systematic review and meta-analysis

Eugeny M Pestryaev, Ufa State Petroleum Technological University, Russian Federation

Title: The cage effect and the frenkel line in the phase diagram

Tushar R Dandekar, Materials Science Indian Institute of Technology Bombay Powai, India

Title: Effect of microstructure and texture on the evolution of mechanical properties in a cold rolled and annealed UNS S32101 lean duplex stainless steel sheet

M Senthil Kumar, Indian Institute of Technology Bombay, India

Title: Magnetotransport properties of metal-silicon multilayers

Shahnaz Ghasemi, Sharif University of Technology, Iran

Title: An overview of heterogonous photocatalysts and their application in wastewater treatment: Reactor design and operational conditions

Barbara Flora, Tor Vergata University of Rome, Italy

Title: Strategies of additive manufacturing in cranioplasty

Vladislav Bogdanov, Progressive Research Solutions, Australia

Title: About problem of plane strain state of two-layer body in dynamic elastic-plastic formulation

Juan A Mateu Sanchez, Universitat Politecnica de Valencia, Spain

Title: Testing methods for the assessment of prestressed concrete members

Prabha Samudre, Indian Institute of Science, India

Title: Development of high strength aluminium matrix composites using accumulative roll bonding (ARB)

Evgeny Grigoryev, Merzhanov Institute of Structural Macrokinetics and Materials Science Russian Academy of Sciences, Russian Federation

Title: Advances of high-voltage consolidation of powder materials

Govind Gupta, CSIR-National Physical Laboratory New Delhi, India

Title: Fabrication of detectors based on semiconductor heterostructures for optical communication

Hira Ijaz, Pak Austria Fachhochschule Institute of Applied Science and Technology, Pakistan

Title: Thiolation of arabinoxylan and its application in the fabrication of pH: Sensitive thiolated arabinoxylan grafted acrylic acid copolymer

S Thirugnanasambandam, Annamalai University, India

Title: Route to geopymer concrete through cement replacement

Lebogang Manamela, University of Pretoria, South Africa

Title: Evaluation of cellulose acetate supported MOF-5/crystalline nanocellulose nanocomposite as an adsorbent for methylene blue removal from water

Dipak Kumar Maiti, Indian Institute of Technology Kharagpur, India

Title: Stochastic aeroelastic response of variable stiffness laminated composite plates

Sangeeta Tiwari, Amity University Noida, India

Title: Functional nano fibrous mats for removal of toxic contaminants from water

Arun Kumar Singh, Guru Ghasidas Vishwavidyalaya, India

Title: Modification in the electronic properties of CVD grown SLG by deposition of thin transparent conducting polymer

Najam Ul Hassan, University of Education, Pakistan

Title: Structural, martensitic and magnetic properties of NiMnCoTi ferromagnetic shape memory alloys

Uroosa Ejaz, Shaheed Zulfikar Ali Bhutto Institute of Science and Technology, Pakistan

Title: Fabrication of methylcellulose/polyvinyl alcohol as porous composite

Ahmad Al Abdulqader, Saudi Aramco, Saudi Arabia

Title: Vessels conditional R&A

Mahesh Anil Naik, Defence Institute of Advanced Technology, India

Title: Experimental investigation of the effect of fiber orientation and sliding speed on wear properties of additively manufactured continuous GFRP composites

Poster Presentations:

Omar, Novosibirsk State University of Architecture, Russian Federation

Title: Compressive strength and deformability of masonry made ceramic blocks

Pyshyev Serhiy, Lviv Polytechnic National University, Ukraine

Title: Study of optimal conditions for extraction by toluol and humic acids from lignite

Zeinab Sanaee, University of Tehran, Iran

Title: Prelithiation of silicon based nanomaterial anode for lithium ion battery application

Zeinab Sanaee, University of Tehran, Iran

Title: Synthesis of silicon nanowires as a high performance anode material for lithium ion batteries

Magnus Group would like to express its gratitude to all contributors for their outstanding contributions to the conference, which enabled us to successfully complete this event.
We are happy to invite you to our prestigious "6th Edition of International Conference on Materials Science and Engineering" (MATERIALS 2024), which is scheduled to take place as Hybrid Format in Singapore during March 18–20, 2024. This announcement comes in response to the positive feedback and comments we received from participants and supporters at MATERIALS 2023. We anticipate your gracious participation at this esteemed international symposium, which will discuss the theme "Shaping the Future by Combining Knowledge and Innovations in Material Science."

Upcoming Materials Science Conferences:

Conference Name: 6th Edition of International Conference on Materials Science and Engineering
Dates: March 18-20, 2024,
Venue: Singapore

Conference Name: 7th Edition of International Conference on Materials Science and Engineering
Dates: October 28-30, 2024
Venue: Baltimore, MD, USA

For Magnus Group Conferences Reviews:
Magnus Group Materials Conferences Reviews | Magnus Conferences Reviews

Magnus Group successfully hosted the "2^nd Edition of International Conference on Materials Science and Engineering" (MATERIALS 2022) during the month of March 28-30, 2022 as a virtual event.

The congress was based on the theme “Sustainable Thriving in a Material Hungry World” and was indeed a resounding hit, with notable keynote speakers from a variety of reputable organizations and universities addressing the audience. The essence of MATERIALS 2022 was carried out through many Scientific-sessions and plenary lectures, and we would like to convey our heartfelt gratitude to all of the distinguished guests and keynote speakers.

The latest trends and concerns in inter-disciplinary domains of Materials Science and Engineering were reviewed, as well as its technological breakthroughs, were discussed in a series of lectures given by eminent professionals.

2nd Edition of International Conference on Materials Science and Engineering Report:

Keynote Presentations:

Bala Vaidhyanathan, Loughborough University, United Kingdom

Title: Additive manufacturing of advanced ceramics: The art of the possible

Jean Ebothe, Université de Reims Champagne Ardenne, From France

Title: Geometrical impact on magnetic properties of mesoscopic scale thick nickel thin films

Kamran Nikbin, Imperial College, United Kingdom

Title: An integrated multiscale structural integrity approach to predicting damage and failure in advanced steels under fatigue/creep/oxidation

Zakaria Bomerzoug, University of Biskra, Algeria

Title: Continuous casting of copper wire

Vasily Lutsyk, Siberian Branch of the Russian Academy of Sciences, From Russian Federation

Title: 3D computer models of isobaric phase diagrams for ternary systems to verify and validate thermodynamic calculation and experimental investigation: Ag-Bi(Sb)-Sn, Al(Bi)-Sn-Zn, Au-Ge-Sn

Oral Presentations:

Li Hui, Northeastern University, China

Title: Vibration and damping study of multifunctional grille composite sandwich plates with an IMAS design approach

Jake Airey, Rolls-Royce, Singapore

Title: The tribological performance of gas turbine lubricants

Siwat Linjee, Chiangmai University, From Thailand

Title: Development of ultrafine-grained Al-Zn-In alloy for high-performance Al-air battery anode

Thorsten Pretsch, Fraunhofer IAP, Germany

Title: Recognizing the potential of 4d printing

Leelakrishna, University of Johannesburg, From South Africa

Title: Recent development in NaCa(AG):sm3+ (where AG = BO3-3, PO4-3 and SO4-2) nanophosphors-applications for solid state lightning

Shivani Dhall, DAV College, India

Title: Role of candle carbon soot as gas sensing material

Rupali Nagar, Symbiosis Institute of Technology, India

Title: Sol-derived three-dimensional growth of tin oxide fractals

Shwetha Govinda Bhat, Indian Institute of Science, India

Title: Oxide substrate termination and 2D growth of perovskite magnetic oxide ultra-thin films

Ramavatar Meena, CSIR-Central Salt and Marine Chemicals Research Institute, India

Title: Seaweed polymer containing functional materials to protect environment

Soumendu Sinha, CSIR - Central Electronics Engineering Research Institute, India

Title: Development of sensing film materials using reactive sputtering process for FET-based pH Sensors

Bhaswati Choudhury, SurfPlasma, Inc, United States

Title: Surface dielectric barrier discharge (DBD) plasma decontamination

Chi Ho Wong, The Hong Kong University of Science and Technology, Hong Kong

Title: Enormous enhancement of p-orbital magnetism in the lightly doped carbon chains

S S Lokesh Vendra, Indian Institute of Technology, India

Title: Transition metal modified SiOC as a next generation dielectric material for energy storage applications

Seongwoo Woo, Ethiopian Technical University, Ethiopia

Title: Improving the Reliability Design of Mechanical Systems such as Refrigerator

Selcuk Poyraz, Adiyaman Universit, Turkey

Title: A novel combined approach to simultaneous nanostructured conducting polymer carbonization and carbon nanotube/metal oxide nanowire growth

Osman Adiguzel, Firat University, Turkey

Title: Shape Reversibility and Displacive Transformations in Shape Memory Alloys

EL Moudni EL Alami Souad, Université Mohamed 1er, Morocco

Title: Industrial by-products of granular character: management issues and valorization approach in Civil Engineering

Chaimaa diouri ayad, Cedoc EHTP/ office chérifien des phosphates du Maroc, Morocco

Title: Moroccan phosphogypsum valorisation in road application

Vito Rizzi, University of Bari "Aldo Moro", Italy

Title: Agricultural wastes as environmentally friendly materials to remove pollutants from water

Jennifer Gubitosa, University of Bari "Aldo Moro", Italy

Title: A food waste-based polyphenolic extract for synthesizing gold nanoparticles as powerful multifunctional platforms in cosmetics and biomedicine

Thomas Webster, Interstellar Therapeutics, United States

Title: Commercializing university-based research: Self-assembled nanomaterials for fighting COVID-19, inhibiting infection, killing cancer, and regenerating tissues

Ricardo Acosta Oortiz, Centro de Investigación en Química Aplicada, Mexico

Title: Synthesis and evaluation of the performance of a new curing agent for the photopolymerization of biobased epoxy resins

Mustapha Hidouri, Gabes University, Tunisia

Title: Multiple ion-substituted hydroxyfluorapatites bioceramics

Dhanesh G. Mohan, Shandong University, China

Title: High entropy alloys for additive manufacturing

Sunanda Dhar, University of Calcutta, India

Title: Growth of dilute III-V-N and III-V-Bi semiconductors by liquid phase epitaxy

Nandini Bhattacharya, The Energy and Resources institute, India

Title: Green synthesized graphene for delivery of plant growth regulators into plants

Prasanta Chowdhury, National aerospace Laboratories, India

Title: Development of current sensors using giant magnetoresistance effect in magnetic multilayers

Atteshamuddin S. Sayyad, Sanjivani College of Engineering Kopargaon, India

Title: Frequency analysis of functionally graded material circular beams

Praveen Kumar Saxena, Tech Next Lab Pvt Ltd, India

Title: Material growth, characterization of group IV, III-V & II-VI semiconductors and its use for various device applications

Arun Kumar Singh, Guru Ghasidas Vishwavidyalaya, India

Title: Impact of Molecular Ordering and Alignment of Conjugated Polymer on Charge Transport

Sanjay B. Patil, Shriman Sureshdada Jain College of Pharmacy, India

Title: Development and in vitro evaluation of chitosan microspheres of sertraline hydrochloride for nasal delivery

Swamini Chopra, Maharashtra Institute of Technology, India

Title: Cryogenic treatment: evolution for polymeric materials

Minakshi Sharma, Maharshi Dayanand University, India

Title: Fabrication of an electrochemical cytochrome c biosensor based on graphene oxide nanoparticles

Chebrolu Pulla Rao, IIT Tirupati, India

Title: Protein - Inorganic Sustainable Hybrid Nano-Materials in Water Purification

Alicja Tymoszuk, Bydgoszcz University of Technology and Science, Poland

Title: Nanomaterials in improving micropropagation and breeding techniques of horticultural plants

Diogo M.F. Santos, C, eFEMA, IST-Ulisboa, Portugal

Title: Towards effective green hydrogen production by enhancing oxygen electrode kinetics with transition metals (Ni, Fe, Cu) alloyed to platinum supported on graphene nanoplatelets

Leonardo Prieto Abello, Instituto Distrital de Ciencia, Biotecnología e Innovación en Salud, Colombia

Title: Evaluation of polycaprolactone and glycine electrospun biocomposite as scaffold for tissue construct skin

Najam Ul Hassan, University of Education, Pakistan

Title: Tunable martensitic transformation and magnetic properties of Sm doped NiMnSn ferromagnetic shape memory alloys

Poster Presentations:

Foo Ngiap Yew Jared, Rolls-royce Singapore Pte Ltd, Singapore

Title: A case study of austenitic stainless steel air tube fracture from an aircraft gas turbine engine

Changliang Yao, Korea Maritime and Ocean University, Republic of Korea

Title: Study on mechanical properties of copper alloy (CuNi2SiCr) layered on nickel aluminum bronze (NAB) by using direct energy deposition

Magnus Group would like to thank all the contributors for their wonderful participation towards the conference which helped us for fruitful finishing of this event.

For Magnus Group Conferences Reviews:
Magnus Group Materials Conferences Reviews | Magnus Conferences Reviews

International Conference on Minerals, Metallurgy and Materials (Materials 2021) Report:

Materials 2021 held during March 22-24, 2021 was a forum to bring together business people, researchers, scientists, and industry professionals to discuss innovative ideas and diverse topics on next generation technologies and services. The meeting was held successfully with the objective to foster discussions and strengthen connections between experts and policymakers in the field of Materials, Minerals and Materials Science.

Through a wide range of keynote speeches, tutorials, and discussions, we have been presented with new ways to deal with some of the challenges in the field. We hope that you have shared your experiences and expertise with other participants from near and far, and that a cordial relationship established among us during the Conference will further strengthen… But, of course, the real measure of this conference success lies in how it will affect you. We look forward to further building partnerships with you and your organizations. I hope that all of us will continue what we have started here.

The event comprised world class keynote speakers, oral and poster presentations from eminent researchers and postdocs.

Keynote Presentations:

Eric Buhler, The University of Paris, France

Title: Integration of molecular machines and motors into supramolecular materials: Structural properties studied by small-angle neutron and X-ray scattering

Marek Godlewski, Institute of Physics Polish Academy of Sciences, Poland

Title: Thin films of oxides by atomic layer deposition –New applications

Lavinia Curecheriu, Alexandru Ioan Cuza University, Romania

Title: Size-dependent properties in BaTiO3 - based ceramics

Vasily Lutsyk, Institute of Physical Materials Science SB RAS, Russian Federation

Title: Computer models of Т-х-у Diagrams: Verification of Ag-Cu-Ni & A-Sb-Sn (A = Ag, Au, Bi, Co, Cu, In, Ni) ternary systems

Ashish Kumar, Lovely Professional University, India

Title: Computational, thermodynamic and experimental studies on acid corrosion Inhibition of aluminium by Acarbose

Oral Presentations:

Fouad Erchiqui, Universite du Quebec en Abitibi-Temiscamingue, Canada

Title: Hybrid enthalpy method for finite element thermal analysis of multi-materials involving multiorientations of the thermal conductivity tensor

Waldemar Swiderski, Military Institute of Armament Technology, Poland

Title: Detection of defects in CFRP composites by optical thermography methods

Nazaret Ruiz Marin, University of Cadiz, Spain

Title: The use of thin AlAs capping layers in the InAs/GaAs quantum dot system for intermediate band solar cells

Sara Flores Gallegos, University of Cadiz, Spain

Title: Comparative of different capping approaches in the preservation of InAs/GaAs quantum dots in terms of content, size and density

Orlando Vaselli, University of Florence, Italy

Title: Remediation activities in the former mercury nmine of abbadia san salvatore (Tuscany, central Italy)

Anchal Nahata, Bits Pilani Dubai Campus, United Arab Emirates

Title: Extrusion, microstructure and mechanical characterization of a new magnesium based multicomponent alloy

Maryam Alejji, Qatar University, Qatar

Title: Investigated the behaviour of engineering nanoparticle materials during the anaerobic digestion

Noora Al-Qahtani, Qatar University, Qatar

Title: Coins from Al-zubarah, Qatar: A historicalscientific study

Mohamed Oubaaqa, Ibn Tofail University, Morocco

Title: Evaluation of ecofriendly compounds performance as corrosion inhibitors for mild steel in molar hydrochloric acid: electrochemical study and theoretical approach

Francisco Maciel Monticeli, Sao Paulo State University, Brazil

Title: On the enhanced in interfacial strength through carbon/glass hybrid composite: mode I fatigue delamination

Lenka Zajickova, Brno University of Technology, Czech Republic

Title: Plasma-processed nanofibrous electrospun mats as functional scaffolds or drug delivery systems

Ashwini Kumar, Luzhou Vocational and Technical College, China

Title: Observation of spin-reorientation transitions in BiFeO3 multiferroics modified by lead and titanium

Xinqi Chen, Hubei University of Education, China

Title: Copper sulfide composite thermoelectric materials: structure design and performance boost

Mohamed H Abdelaziz, French University in Egypt, Egypt

Title: Mechanical behavior of transition metalscontaining Al-Si-Cu-Mg cast alloy subjected to prolonged thermal exposure

Peter Kessels Dadzie, Kumasi Technical University, Ghana

Title: The worth of tropical hardwood branchwood as supplementary material to its stemwood for wood products manufacturing

Selcuk Poyraz, Adıyaman University, Turkey

Title: A novel microwave energy-based approach to hybrid nanomaterial preparation for electrochemical energy storage purposes

Poster Presentations:

Danuta Olszewska, AGH University of Science and Technology, Poland

Title: Preparation anode materials for Li-ion batteries like catalysts materials with transitions metals

Paulina Piotrkiewicz, Warsaw University of Technology, Poland

Title: Influence of the metal content on microstructure and selected properties of Al2O3-Cu-Ni compositesmanufactured by uniaxial pressing

Justyna Zygmuntowicz, Warsaw University of Technology, Poland

Title: Fabrication of Al2O3-Cu-Mo composites by centrifugal slip casting method

Barbara Nisi, CNR-Insitute of Geosciences and Earth Resources, Italy

Title: Recovering abandoned mining areas: the case study of abbadia san salvatore (Siena, Tuscany Region, Central Italy)

Irina V Kunilova, ICEMR RAS, Russia

Title: Physical and chemical basis of new process recovery of valuable elements from waste of solid fossil fuels

Manuel Cortez Valadez, University of Sonora, Mexico

Title: Silver nanoparticles in zeolites matrix incorporated in commercial coating

Miss. Maria Borrego Algarra, University of Huelva, Spain

Title: Development of lignin-PVP micro- and nanostructures by electrospinning and their thickening capacity in oil media

Finally, we express deep gratitude on behalf of the Organizing and Steering Committees who worked together and extremely hard to make this event outstanding. Tender thanks were expressed to all the presenters and delegates, for their valuable contributions to the event.

For Magnus Group Conferences Reviews:
Magnus Group Materials Conferences Reviews | Magnus Conferences Reviews