_    ___ ___      _                               
/ \ |_ _/ _ \ ___| |_ _ __ ___ __ _ _ __ ___ ___
/ _ \ | | | | / __| __| '__/ _ \/ _` | '_ ` _ \/ __|
/ ___ \ | | |_| \__ \ |_| | | __/ (_| | | | | | \__ \
/_/ \_\___\___/|___/\__|_| \___|\__,_|_| |_| |_|___/
Twitch
Invidious (YT)

Invidious > Channel > Anime_Edu - Civil Engineering Videos

Trending
Anime_Edu - Civil Engineering Videos 87800 subscribers    RSS
View channel on YouTube
Videos
Playlists

YT 2 minutes 58 seconds
Anime_Edu - Civil Engineering Videos
What is Prestressed Concrete? || Types of Prestressed Concrete || Types of Concrete #3
YT 4 minutes 36 seconds
Anime_Edu - Civil Engineering Videos
How to determine flexural strength test of concrete || Laboratory Concrete Test #3
YT 3 minutes 53 seconds
Anime_Edu - Civil Engineering Videos
Ultrasonic Pulse Velocity Test for Concrete || Non-Destructive Testing Methods (NDT) #8
YT 3 minutes 37 seconds
Anime_Edu - Civil Engineering Videos
Underwater Concreting || Placing of Concrete || Manufacture of Concrete #18 ||
YT 3 minutes 40 seconds
Anime_Edu - Civil Engineering Videos
Compaction Factor Test for Concrete || Test for Workability of Concrete#3
YT 3 minutes
Anime_Edu - Civil Engineering Videos
Vee-Bee Consistometer Test for Concrete || Test for Workability of Concrete #5
YT 4 minutes 10 seconds
Anime_Edu - Civil Engineering Videos
How to determine Aggregate Crushing Value || Aggregate Crushing Strength || Aggregate Test #1
YT 2 minutes 59 seconds
Anime_Edu - Civil Engineering Videos
Concrete Slump Test || Test for Workability of Concrete#1
YT 2 minutes 45 seconds
Anime_Edu - Civil Engineering Videos
How to determine split tensile strength test of concrete || Laboratory Concrete Test #2
YT 3 minutes 19 seconds
Anime_Edu - Civil Engineering Videos
How to Determine the Initial & Final Setting Time of the Cement || Cement Test #2 ||
YT 3 minutes 39 seconds
Anime_Edu - Civil Engineering Videos
The overview of the Process of Hydration of Cement || Hydration of Cement #1 ||
YT 3 minutes 33 seconds
Anime_Edu - Civil Engineering Videos
How to Determine Compressive Strength of the Concrete || Laboratory Concrete Test #1
YT 2 minutes 37 seconds
Anime_Edu - Civil Engineering Videos
Surface Hardness Methods || Rebound Hammer Test || Non-Destructive Testing Methods #2
YT 4 minutes 25 seconds
Anime_Edu - Civil Engineering Videos
M Sand Vs River Sand || Which is best for construction? || Manufactured Sand #Part1
YT 3 minutes 48 seconds
Anime_Edu - Civil Engineering Videos
How to determine Aggregate Impact Value || Aggregate Impact Test || Aggregate Test #3
YT 1 minute 56 seconds
Anime_Edu - Civil Engineering Videos
Water Curing of Concrete || Types || Manufacture of Concrete #30 ||
YT 2 minutes 13 seconds
Anime_Edu - Civil Engineering Videos
How to Determine Standard Consistency of the Cement || Cement Test #1 ||
YT 3 minutes 16 seconds
Anime_Edu - Civil Engineering Videos
Grades of Concrete || Mix Ratio || Types of Concrete Mixes || Uses ||
YT 3 minutes 15 seconds
Anime_Edu - Civil Engineering Videos
What is Lightweight Concrete? || Types of Concrete #5
YT 1 minute 55 seconds
Anime_Edu - Civil Engineering Videos
Pull-out Resistance Test for Concrete || Non-Destructive Testing Methods (NDT) #4
YT 2 minutes 49 seconds
Anime_Edu - Civil Engineering Videos
Admixtures and Its Function on Concrete || Admixtures #1
YT 4 minutes 14 seconds
Anime_Edu - Civil Engineering Videos
Heat of Hydration of Cement || Hydration of Cement #2 ||
YT 2 minutes 50 seconds
Anime_Edu - Civil Engineering Videos
Flow Table Test for Concrete || Test for Workability of Concrete #4
YT 3 minutes 7 seconds
Anime_Edu - Civil Engineering Videos
What is Ready Mix Concrete? || What is RMC? || Types of Concrete #8
YT 2 minutes 22 seconds
Anime_Edu - Civil Engineering Videos
What is Polymer Concrete? || Types of Polymer Concrete || Types of Concrete #9
YT 3 minutes 20 seconds
Anime_Edu - Civil Engineering Videos
Soundness Test of Cement by Le-Chatelier Method || Cement Test || Test on Cement||
YT 3 minutes 36 seconds
Anime_Edu - Civil Engineering Videos
Plasticizers for Concrete || Admixtures #2
YT 1 minute 51 seconds
Anime_Edu - Civil Engineering Videos
Penetration Tests on Concrete (Windsor Probe System) || Non-Destructive Testing Methods (NDT) #3
YT 3 minutes 5 seconds
Anime_Edu - Civil Engineering Videos
How to Determine the Compressive Strength of Cement || Cement Test #3 ||
YT 2 minutes 28 seconds
Anime_Edu - Civil Engineering Videos
Non Destructive Testing Methods for Concrete #1
YT 2 minutes 17 seconds
Anime_Edu - Civil Engineering Videos
How to check cement quality in the field?// 7 simple tests to check cement quality in the site //
YT 3 minutes 16 seconds
Anime_Edu - Civil Engineering Videos
What is High Strength Concrete? || Types of Concrete #10
YT 2 minutes 25 seconds
Anime_Edu - Civil Engineering Videos
What is Fibre Cement? || Uses || Types of Cement #10 ||
YT 2 minutes 20 seconds
Anime_Edu - Civil Engineering Videos
Internal Vibrator for Compaction of Concrete || Manufacture of Concrete #22 ||
YT 2 minutes 41 seconds
Anime_Edu - Civil Engineering Videos
Superplasticizers for Concrete || Admixtures #3
YT 2 minutes 20 seconds
Anime_Edu - Civil Engineering Videos
Determination of Fineness of Cement by Sieve Analysis || Cement Test || Test on Cement||
YT 3 minutes 10 seconds
Anime_Edu - Civil Engineering Videos
What is Polymer Modified Concrete? || Polymer Cement Concrete || Types of Concrete #9.2
YT 5 minutes 55 seconds
Anime_Edu - Civil Engineering Videos
The Overview of the Stages involved in Manufacture of Concrete || Manufacture of Concrete #1 ||
YT 3 minutes 21 seconds
Anime_Edu - Civil Engineering Videos
M Sand Vs River Sand || Advantages and Disadvantages of M-sand Over River Sand #Part2
YT 2 minutes 32 seconds
Anime_Edu - Civil Engineering Videos
What is Shotcrete? || Gunite || Sprayed Concrete || Types of Concrete #13
YT 2 minutes 5 seconds
Anime_Edu - Civil Engineering Videos
What is formwork or shuttering? // What are the requirements of good formwork? //
YT 2 minutes 18 seconds
Anime_Edu - Civil Engineering Videos
Kelly Ball Test for Concrete || Test for Workability of Concrete #6
YT 2 minutes 48 seconds
Anime_Edu - Civil Engineering Videos
Accelerators for Concrete || Admixtures #5
YT 3 minutes 1 second
Anime_Edu - Civil Engineering Videos
Retarders for Concrete || Admixtures #4
YT 2 minutes 59 seconds
Anime_Edu - Civil Engineering Videos
What is Portland Slag Cement? (PSC) || Properties ||Uses || Types of Cement #4 ||
YT 2 minutes 44 seconds
Anime_Edu - Civil Engineering Videos
What is Precast Concrete? || PCI || Types of Concrete #4
YT 3 minutes 12 seconds
Anime_Edu - Civil Engineering Videos
How to determine 10 per cent fines value of aggregate || Aggregate Test #2
YT 3 minutes 18 seconds
Anime_Edu - Civil Engineering Videos
Workability of Concrete || Properties of Fresh Concrete #1
YT 2 minutes 32 seconds
Anime_Edu - Civil Engineering Videos
What is Portland Pozzolana Cement (PPC)? || Properties || Uses || Types of Cement #6 ||
YT 3 minutes 12 seconds
Anime_Edu - Civil Engineering Videos
What is Self Consolidated Concrete || Self Compacting Concrete || Types of Concrete #12
YT 1 minute 56 seconds
Anime_Edu - Civil Engineering Videos
Formwork Vibrator for Compaction of Concrete || Manufacture of Concrete #23 ||
YT 2 minutes 42 seconds
Anime_Edu - Civil Engineering Videos
Rebar Detector and Cover Meter for Concrete || Non-Destructive Testing Methods (NDT) #10
YT 2 minutes 13 seconds
Anime_Edu - Civil Engineering Videos
Air-Entraining Agents for Concrete || Admixtures # 6
YT 1 minute 50 seconds
Anime_Edu - Civil Engineering Videos
What is Air Entrained Concrete? || Types of Concrete #7
YT 3 minutes 5 seconds
Anime_Edu - Civil Engineering Videos
What is Membrane Curing of Concrete || Manufacture of Concrete #31 ||
YT 3 minutes 13 seconds
Anime_Edu - Civil Engineering Videos
What is Recycled Concrete Aggregate?|| Crushed Concrete Aggregate || #1
YT 2 minutes 18 seconds
Anime_Edu - Civil Engineering Videos
What is concrete? || Definition of Concrete || Plain Cement Concrete || Types of Concrete #1
YT 2 minutes 35 seconds
Anime_Edu - Civil Engineering Videos
What is Translucent Concrete? || Transparent Concrete || Types of Concrete #19
YT 2 minutes 11 seconds
Anime_Edu - Civil Engineering Videos
Pull-off Resistance Method for Concrete | James Bond Test | Non-Destructive Testing Methods (NDT) #5
YT 2 minutes 23 seconds
Anime_Edu - Civil Engineering Videos
What is High Performance Concrete? || Types of Concrete #11
YT 2 minutes 50 seconds
Anime_Edu - Civil Engineering Videos
What is Polymer Impregnated Concrete? || Types of Concrete #9.3
YT 2 minutes 48 seconds
Anime_Edu - Civil Engineering Videos
Pozzolanic or Mineral Admixtures for Concrete || Admixtures #7
YT 2 minutes 17 seconds
Anime_Edu - Civil Engineering Videos
What is Limecrete? || Lime Concrete || Types of Concrete #17
YT 2 minutes 43 seconds
Anime_Edu - Civil Engineering Videos
Compaction of Concrete || Manufacture of Concrete #19 ||
YT 3 minutes 14 seconds
Anime_Edu - Civil Engineering Videos
What is High Alumina Cement? || Properties || Uses || Types of Cement #2 ||
YT 2 minutes 4 seconds
Anime_Edu - Civil Engineering Videos
Bleeding of Concrete || Properties of Fresh Concrete #4
YT 2 minutes 14 seconds
Anime_Edu - Civil Engineering Videos
Weigh Batching of Concrete || Batching of Concrete #2 || Manufacture of Concrete #3 ||
YT 2 minutes 46 seconds
Anime_Edu - Civil Engineering Videos
What is Green Concrete? || Types of Concrete #18
YT 2 minutes 10 seconds
Anime_Edu - Civil Engineering Videos
Segregation of Concrete || Properties of Fresh Concrete #3
YT 2 minutes 16 seconds
Anime_Edu - Civil Engineering Videos
Setting Time of Concrete || Properties of Fresh Concrete #7
YT 2 minutes 11 seconds
Anime_Edu - Civil Engineering Videos
Volume Batching of Concrete || Batching of Concrete #1 || Manufacture of Concrete #2 ||
YT 3 minutes 4 seconds
Anime_Edu - Civil Engineering Videos
Factors Affecting Workability of Concrete, Part 1 || Workability of concrete 2
YT 2 minutes 9 seconds
Anime_Edu - Civil Engineering Videos
What is Reinforced Cement Concrete? || Types of Concrete #2
YT 2 minutes 50 seconds
Anime_Edu - Civil Engineering Videos
Steam Curing of Concrete at Ordinary Pressure || Manufacture of Concrete #33 ||
YT 1 minute 58 seconds
Anime_Edu - Civil Engineering Videos
What is Rapid Hardening Portland Cement? || Types of Cement #1 ||
YT 3 minutes 16 seconds
Anime_Edu - Civil Engineering Videos
Relation Between Compressive and Tensile Strength of Concrete #9
YT 2 minutes 29 seconds
Anime_Edu - Civil Engineering Videos
What is High Density Concrete? || What is Heavyweight Concrete? || Types of Concrete #6
YT 2 minutes 30 seconds
Anime_Edu - Civil Engineering Videos
Impact echo Test for Concrete || Non-Destructive Testing Methods (NDT) #9
YT 4 minutes 29 seconds
Anime_Edu - Civil Engineering Videos
How to calculate the quantity of cement and aggregates for 1 metre cubic concrete for any mix ratio?
YT 1 minute 51 seconds
Anime_Edu - Civil Engineering Videos
Table Vibrator for Compaction of Concrete || Manufacture of Concrete #24 ||
YT 2 minutes 26 seconds
Anime_Edu - Civil Engineering Videos
Pan-type or Stirring Concrete Mixer || Mixing of Concrete#5 || Manufacture of Concrete #8
YT 4 minutes 22 seconds
Anime_Edu - Civil Engineering Videos
Influence of Recycled Aggregate on Concrete Properties || Recycled Concrete aggregate #2
YT 1 minute 44 seconds
Anime_Edu - Civil Engineering Videos
Definition of Lean Concrete, Normal Concrete and Rich Concrete // Uses of these Concrete //
YT 2 minutes 37 seconds
Anime_Edu - Civil Engineering Videos
Non-tilting Drum & Reversing Drum Concrete Mixer|| Mixing #4 || Manufacture of Concrete #7 ||
YT 2 minutes 8 seconds
Anime_Edu - Civil Engineering Videos
What is Pervious Concrete? || Porous Concrete || Permeable Concrete || Types of Concrete #14
YT 2 minutes 33 seconds
Anime_Edu - Civil Engineering Videos
What is Sulphate Resisting Cement? || Properties ||Uses || Types of Cement #3 ||
YT 2 minutes 29 seconds
Anime_Edu - Civil Engineering Videos
What is Normal Polymer Concrete? || Complete Polymer Concrete || Types of Concrete #9.1
YT 3 minutes 1 second
Anime_Edu - Civil Engineering Videos
Concrete K Slump Test || Test for Workability of Concrete#2
YT 2 minutes 14 seconds
Anime_Edu - Civil Engineering Videos
Resonant Frequency Test for Concrete || Non-Destructive Testing Methods (NDT) #6
YT 2 minutes 18 seconds
Anime_Edu - Civil Engineering Videos
Damp-proofing and Waterproofing Admixture for Concrete || Admixtures #9
YT 2 minutes 18 seconds
Anime_Edu - Civil Engineering Videos
Damp-proofing and Waterproofing Admixture for Concrete || Admixtures #9
YT 2 minutes 18 seconds
Anime_Edu - Civil Engineering Videos
Damp-proofing and Waterproofing Admixture for Concrete || Admixtures #9
YT 3 minutes 51 seconds
Anime_Edu - Civil Engineering Videos
Gel-space Ratio || Strength of Concrete #3
YT 3 minutes 6 seconds
Anime_Edu - Civil Engineering Videos
Hand Compaction of Concrete || Manufacture of Concrete #20 ||
YT 1 minute 40 seconds
Anime_Edu - Civil Engineering Videos
Surface Vibrator for Compaction of Concrete || Manufacture of Concrete #25 ||
YT 2 minutes 58 seconds
Anime_Edu - Civil Engineering Videos
Tilting drum Concrete Mixer for Concrete || Mixing of Concrete#3 || Manufacture of Concrete #6 ||
YT 2 minutes 26 seconds
Anime_Edu - Civil Engineering Videos
What is Asphalt Concrete? || Types of Concrete #16
YT 2 minutes 10 seconds
Anime_Edu - Civil Engineering Videos
Hand Mixing of Concrete || Mixing of Concrete#1 || Manufacture of Concrete #4 ||
YT 2 minutes 39 seconds
Anime_Edu - Civil Engineering Videos
Curing of Concrete || Manufacture of Concrete #29 ||
YT 2 minutes 45 seconds
Anime_Edu - Civil Engineering Videos
Transportation of Concrete Part I | Mortar Pan | Wheel Barrow || Manufacture of Concrete #9 ||
YT 2 minutes 8 seconds
Anime_Edu - Civil Engineering Videos
What is Plum Concrete? || Types of Concrete #20
YT 2 minutes 21 seconds
Anime_Edu - Civil Engineering Videos
Effect of Maximum size of Aggregate on Strength of Concrete #4
YT 2 minutes 40 seconds
Anime_Edu - Civil Engineering Videos
Maturity Test on Concrete || Non-Destructive Testing Methods (NDT) #7
YT 1 minute 24 seconds
Anime_Edu - Civil Engineering Videos
Plastic Shrinkage & Thermal Shrinkage of Concrete || Properties of Fresh Concrete #6
YT 2 minutes 42 seconds
Anime_Edu - Civil Engineering Videos
Chute and Skip Hoist Methods of Transportation of Concrete || Manufacture of Concrete #12 ||
YT 3 minutes 37 seconds
Anime_Edu - Civil Engineering Videos
Water-Cement Ratio of Concrete || Strength of Concrete #2
YT 3 minutes 19 seconds
Anime_Edu - Civil Engineering Videos
Factors Affecting Workability of Concrete, Part 2 || Workability of concrete 3
YT 2 minutes
Anime_Edu - Civil Engineering Videos
Steam Curing of Concrete at High Pressure || Manufacture of Concrete #34 ||
YT 2 minutes 34 seconds
Anime_Edu - Civil Engineering Videos
Maturity Concept of Concrete || Strength of Concrete #8
YT 1 minute 57 seconds
Anime_Edu - Civil Engineering Videos
Curing of Concrete by Application of Heat || Manufacture of Concrete #32 ||
YT 2 minutes 1 second
Anime_Edu - Civil Engineering Videos
Machine Mixing of Concrete || Mixing of Concrete#2 || Manufacture of Concrete #5 ||
YT 2 minutes 40 seconds
Anime_Edu - Civil Engineering Videos
Compaction by Vibration (Concrete) || Manufacture of Concrete #21 ||
YT 2 minutes 20 seconds
Anime_Edu - Civil Engineering Videos
Placing of Concrete in Dams & Bridge || Mass Concreting || Manufacture of Concrete #17 ||
YT 1 minute 41 seconds
Anime_Edu - Civil Engineering Videos
Consistency of Concrete || Properties of Fresh Concrete #2
YT 2 minutes 20 seconds
Anime_Edu - Civil Engineering Videos
Factors Affecting Workability of Concrete, Part 3 || Workability of concrete 4
YT 2 minutes 41 seconds
Anime_Edu - Civil Engineering Videos
What is Low Heat Portland Cement? || Properties ||Uses || Types of Cement #5 ||
YT 1 minute 51 seconds
Anime_Edu - Civil Engineering Videos
Crane, Bucket and Ropeway Method of Transportation of Concrete || Manufacture of Concrete #10 ||
YT 3 minutes 30 seconds
Anime_Edu - Civil Engineering Videos
Pump and Pipeline Method of Transportation of Concrete || Manufacture of Concrete #13 ||
YT 1 minute 25 seconds
Anime_Edu - Civil Engineering Videos
Platform Vibrator for Compaction of Concrete || Manufacture of Concrete #26 ||
YT 2 minutes 47 seconds
Anime_Edu - Civil Engineering Videos
Placing of Concrete in Foundation || Manufacture of Concrete #14 ||
YT 2 minutes 45 seconds
Anime_Edu - Civil Engineering Videos
Strength of Concrete #1
YT 1 minute 14 seconds
Anime_Edu - Civil Engineering Videos
Compaction of Concrete by Pressure and Jolting || Manufacture of Concrete #27 ||
YT 48 seconds
Anime_Edu - Civil Engineering Videos
Compaction of Concrete by Spinning || Manufacture of Concrete #28 ||
YT 2 minutes 24 seconds
Anime_Edu - Civil Engineering Videos
Introduction to Cement // History of Cement // Discovery of Cement // Portland Cement
YT 1 minute 22 seconds
Anime_Edu - Civil Engineering Videos
Electrical Curing of Concrete || Manufacture of Concrete #36 ||
YT 2 minutes 47 seconds
Anime_Edu - Civil Engineering Videos
Dumpers & Belt Conveyor Method of Transportation of Concrete || Manufacture of Concrete #11 ||
YT 1 minute 12 seconds
Anime_Edu - Civil Engineering Videos
Curing of Concrete by Infrared Radiation || Manufacture of Concrete #35 ||
YT 3 minutes 10 seconds
Anime_Edu - Civil Engineering Videos
What is Hydrophobic Portland Cement? || Properties ||Uses || Types of Cement #9 ||
YT 3 minutes 6 seconds
Anime_Edu - Civil Engineering Videos
What is Masonry Cement? || Properties || Uses || Types of Cement #7 ||
YT 2 minutes 38 seconds
Anime_Edu - Civil Engineering Videos
What is Self-healing Concrete? || Microfibers || Types of Concrete #21
YT 2 minutes 13 seconds
Anime_Edu - Civil Engineering Videos
Bonding Admixture for Concrete || Admixtures #14
YT 2 minutes 32 seconds
Anime_Edu - Civil Engineering Videos
What is Self-healing Concrete using Microorganism || Bacterial Concrete || Types of Concrete #21.1
YT 2 minutes 36 seconds
Anime_Edu - Civil Engineering Videos
Placing of Concrete in Columns, Beams & Floors/Roofs || Manufacture of Concrete #15 ||
YT 2 minutes 52 seconds
Anime_Edu - Civil Engineering Videos
Gas Forming Agents for Concrete || Admixtures #8
YT 2 minutes 51 seconds
Anime_Edu - Civil Engineering Videos
Finishing of Concrete || Manufacture of Concrete #37 ||
YT 1 minute 52 seconds
Anime_Edu - Civil Engineering Videos
Grades of Cement // Cement Grades // Different Grades of Cement//
YT 1 minute 41 seconds
Anime_Edu - Civil Engineering Videos
Compactibility, Mobility & Stability of Concrete || Properties of Fresh Concrete #5
YT 2 minutes 29 seconds
Anime_Edu - Civil Engineering Videos
Grouting Agents for Concrete || Admixtures #12
YT 2 minutes 29 seconds
Anime_Edu - Civil Engineering Videos
Grouting Agents for Concrete || Admixtures #12
YT 2 minutes 29 seconds
Anime_Edu - Civil Engineering Videos
Grouting Agents for Concrete || Admixtures #12
YT 2 minutes 29 seconds
Anime_Edu - Civil Engineering Videos
Grouting Agents for Concrete || Admixtures #12
YT 3 minutes 26 seconds
Anime_Edu - Civil Engineering Videos
Gain of Strength of Concrete with Age || Strength of Concrete #10
YT 2 minutes 8 seconds
Anime_Edu - Civil Engineering Videos
Workability Agents for Concrete || Admixtures #11
YT 2 minutes 34 seconds
Anime_Edu - Civil Engineering Videos
Placing of Concrete in Road Slabs and Airfield Slabs || Manufacture of Concrete #16 ||
YT 1 minute 32 seconds
Anime_Edu - Civil Engineering Videos
Air-detraining Agents for Concrete || Admixtures #10
YT 1 minute 18 seconds
Anime_Edu - Civil Engineering Videos
Effect of Air Voids on Strength of Concrete #7
YT 2 minutes 44 seconds
Anime_Edu - Civil Engineering Videos
What is Self-healing Concrete Using Superabsorbent Polymers || SAPs || Types of Concrete #21.2
YT 2 minutes
Anime_Edu - Civil Engineering Videos
Effect of Mixing Time on Strength of Concrete #6
YT 2 minutes 49 seconds
Anime_Edu - Civil Engineering Videos
What is Self-healing Concrete using Encapsulated Polymers || Types of Concrete #21.3
YT 3 minutes 30 seconds
Anime_Edu - Civil Engineering Videos
What is Supersulphated Portland Cement? || Properties || Uses || Types of Cement #8 ||
YT 2 minutes 24 seconds
Anime_Edu - Civil Engineering Videos
What is Stamped Concrete? || Types of Concrete #15
YT 1 minute 53 seconds
Anime_Edu - Civil Engineering Videos
Effect of Compaction on Strength of Concrete #5
YT 2 minutes 13 seconds
Anime_Edu - Civil Engineering Videos
Why is Roman Concrete stronger than Modern Concrete ?