Graduate School of Advanced Science and Engineering

  • Japan

Research Output 1973 2019

Filter
Conference contribution
2018

Optimal Responses of Home Energy Management Systems to Volt-watt Functions and Forecast Errors

Dao, V. T., Ishii, H., Hayashi, Y., Takasawa, Y., Murakami, K., Takenobu, Y., Kikusato, H., Kaneko, A. & Yoshizawa, S., 2018 Dec 10, Proceedings - 2018 IEEE PES Innovative Smart Grid Technologies Conference Europe, ISGT-Europe 2018. Institute of Electrical and Electronics Engineers Inc., 8571717

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Energy management systems
Energy Management
Forecast
Electricity
Energy

Preliminary core and fuel design of bwr with multi-Axial fuel shuffling

Tasaki, Y. & Yamaji, A., 2018 Jan 1, Proceedings of the 2018 International Congress on Advances in Nuclear Power Plants, ICAPP 2018. American Nuclear Society, p. 1144-1152 9 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Water cooled reactors
Boiling water reactors
Uranium
Swelling
Thermal conductivity

Three-dimensional numerical study on pool stratification behavior in molten corium-concrete interaction (MCCI) with MPS method

Li, X., Sato, I., Yamaji, A. & Duan, G., 2018 Jan 1, Thermal-Hydraulics and Safety Analyses. American Society of Mechanical Engineers (ASME), Vol. 6B.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Molten materials
Concretes
Ablation
Liquids
Accidents
2017

Analysis of environmental bacteria at single-cell level

Hosokawa, M., Nishikawa, Y., Kogawa, M. & Takeyama, H., 2017 Jul 26, TRANSDUCERS 2017 - 19th International Conference on Solid-State Sensors, Actuators and Microsystems. Institute of Electrical and Electronics Engineers Inc., p. 634-637 4 p. 7994129

Research output: Chapter in Book/Report/Conference proceedingConference contribution

sequencing
bacteria
genome
Bacteria
Genes

Investigation to reduce mass of a ultra-light solid reactor for electricity supply in environments without human maintenance

Akie, H., Yamaji, A., Kugo, T., Iwamura, T. & Suyama, K., 2017 Jan 1, 2017 International Congress on Advances in Nuclear Power Plants, ICAPP 2017 - A New Paradigm in Nuclear Power Safety, Proceedings. International Congress on Advances in Nuclear Power Plants, ICAPP

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Neutrons
Electricity
Uranium
Space probes
Actinides

Preliminary study on flexible core design of super FBR with multi-axial fuel shuffling

Sukarman, Yamaji, A., Someya, T. & Noda, S., 2017 Jan 1, 2017 International Congress on Advances in Nuclear Power Plants, ICAPP 2017 - A New Paradigm in Nuclear Power Safety, Proceedings. International Congress on Advances in Nuclear Power Plants, ICAPP

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Coolants
Enthalpy
Hydraulics
Mixed oxide fuels
Water cooled reactors
2016
1 Citation (Scopus)

Centralized voltage control method using voltage forecasting by JIT modeling in distribution networks

Kawano, S., Yoshizawa, S. & Hayashi, Y., 2016 Jul 22, 2016 IEEE/PES Transmission and Distribution Conference and Exposition, T and D 2016. Institute of Electrical and Electronics Engineers Inc., Vol. 2016-July. 7520006

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Electric power distribution
Voltage control
Electric potential
Data acquisition
Voltage regulators

Development of an EO sampling method for thz pulse detection

Toida, T., Yanagisawa, R., Washio, M. & Sakaue, K., 2016, IPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference. Joint Accelerator Conferences Website (JACoW), p. 155-157 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

sampling
pulses
fiber lasers
S band
light beams

Direct high power laser diagnostic technique on focused electron bunch

Igarashi, D., Takahashi, T., Endo, A., Washio, M. & Sakaue, K., 2016, IPAC 2016 - Proceedings of the 7th International Particle Accelerator Conference. Joint Accelerator Conferences Website (JACoW), p. 4073-4075 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

high power lasers
lasers
electrons
profiles
scattering

Droplet microfluidics for precise and high throughput whole genome amplification toward single-cell genome sequencing

Hosokawa, M., Nishikawa, Y., Kogawa, M. & Takeyama, H., 2016, 20th International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2016. Chemical and Biological Microsystems Society, p. 178-179 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Microfluidics
Amplification
Genes
Throughput
DNA

Economic power flow adjustment technique using series capacitor and generator output adjustment for generation configuration change

Nakatani, F., Mori, Y., Ito, T., Iwamoto, S., Suetsugu, Y. & Higashitani, T., 2016 Jan 19, Proceedings of the 2015 IEEE Innovative Smart Grid Technologies - Asia, ISGT ASIA 2015. Institute of Electrical and Electronics Engineers Inc., 7387033

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Capacitors
Economics
Nuclear power plants
Electric lines
Earthquakes
5 Citations (Scopus)

Energy disaggregation based on semi-binary NMF

Matsumoto, M., Fujimoto, Y. & Hayashi, Y., 2016, Machine Learning and Data Mining in Pattern Recognition - 12th International Conference, MLDM 2016, Proceedings. Springer Verlag, Vol. 9729. p. 401-414 14 p. (Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics); vol. 9729).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Disaggregation
Energy Consumption
Energy utilization
Binary
Energy

Picosecond, kW thin disc laser technology for LPP and FEL EUV sources

Endo, A., Smrz, M., Novak, O., Turcicova, H., Muzik, J., Huynh, J., Mocek, T., Sakaue, K. & Washio, M., 2016 Mar 14, Compact EUV and X-ray Light Sources, EUVXRAY 2016. OSA - The Optical Society, Vol. Part F14-EUVXRAY 2016. ES4A.2

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Videodisks
Free electron lasers
Light sources
Lasers
High power lasers

Power and hour capacity requirement for an energy storage from grid codes

Ito, M., Fujimoto, Y., Mitsuoka, M., Ishii, H. & Hayashi, Y., 2016 Jan 12, Asia-Pacific Power and Energy Engineering Conference, APPEEC. IEEE Computer Society, Vol. 2016-January. 7381022

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Energy storage
Farms
3 Citations (Scopus)

Voltage control by using PV power factor, var controllers and transformer tap for large scale photovoltaic penetration

Aida, S., Ito, T., Mori, Y., Iwamoto, S., Sakaeda, S. & Onoue, Y., 2016 Jan 19, Proceedings of the 2015 IEEE Innovative Smart Grid Technologies - Asia, ISGT ASIA 2015. Institute of Electrical and Electronics Engineers Inc., 7386976

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage control
Controllers
Electric potential
Reactive power
Power control
2015

Advantage of a home energy management systems for PV utilization connected to grid

Yoshida, A., Yoshizawa, S., Fujimoto, Y., Murata, N., Wakao, S., Tanabe, S., Hayashi, Y. & Amano, Y., 2015, ECOS 2015 - 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Energy management systems
electricity
Electricity
photovoltaic system
Electric potential

Analysis of metal vessel wall ablation experiment with high temperature liquid by MPS method

Masumura, D., Oka, Y., Yamaji, A. & Furuya, M., 2015, International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015. American Nuclear Society, Vol. 9. p. 7401-7413 13 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ablation
ablation
vessels
Liquids
liquids
2 Citations (Scopus)

A smart power flow adjustment method with phase shifting transformers for long term generation outages

Ogahara, R., Kawaura, Y., Ando, S., Iwamoto, S., Namba, M. & Kamikawa, N., 2015 Mar 23, Asia-Pacific Power and Energy Engineering Conference, APPEEC. March ed. IEEE Computer Society, Vol. 2015-March. 7066002

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Outages
Electric lines
Branch and bound method

Demonstration of an optical enhancement cavity with 10 micron wavelength

Sakaue, K., Washio, M. & Endo, A., 2015, Proceedings of SPIE - The International Society for Optical Engineering. SPIE, Vol. 9513. 951313

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cavity
Demonstrations
Enhancement
Wavelength
cavities

Development of a lightweight manipulator with constraint mechanism

Matsuoka, D., Enriquez, G., Yap, H. E. & Hashimoto, S., 2015 Jan 9, 2014 International Symposium on Micro-NanoMechatronics and Human Science, MHS 2014. Institute of Electrical and Electronics Engineers Inc., 7006066

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Redundant manipulators
Manipulators
Biomimetics
Biological systems
Muscle

Development of a mode-locked fiber laser system for a high finesse enhancement cavity

Suzuki, R., Kobayashi, T., Sakaue, K., Washio, M. & Endo, A., 2015, Proceedings of SPIE - The International Society for Optical Engineering. SPIE, Vol. 9513. 951312

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Mode-locked fiber lasers
Mode-locked Lasers
Fiber Laser
fiber lasers
Cavity

Distribution automation system for service restoration involving simultaneous disconnection and reconnection of distributed generators

Kawano, S., Fujimoto, Y., Wakao, S., Hayashi, Y., Irie, H., Takenaka, H. & Nakajima, T. Y., 2015 Aug 31, 2015 IEEE Eindhoven PowerTech, PowerTech 2015. Institute of Electrical and Electronics Engineers Inc., 7232609

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Restoration
Automation
Voltage regulators
Electric potential
Electric power distribution
1 Citation (Scopus)

Economic evaluations of residential energy systems based on the prediction-operational planning-control method using time-of-use prices

Ogata, R., Yoshida, A., Fujimoto, Y., Murata, N., Wakao, S., Tanabe, S. & Amano, Y., 2015, ECOS 2015 - 28th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems. International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

Research output: Chapter in Book/Report/Conference proceedingConference contribution

residential energy
Energy management systems
Planning
Economics
planning method
1 Citation (Scopus)

Improvement of prediction interval estimation algorithm with just-in-time modeling for PV system operation

Yamazaki, T., Wakao, S., Fujimoto, Y. & Hayashi, Y., 2015 Dec 14, 2015 IEEE 42nd Photovoltaic Specialist Conference, PVSC 2015. Institute of Electrical and Electronics Engineers Inc., 7355994

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Islanding operation methods integrated with multiple power supplies and HEMS

Yoshinaga, J., Hirohashi, W., Hayashi, Y., Isoe, Y., Miyake, J., Tsuchiya, S. & Wada, M., 2015 Nov 2, Proceedings - 2015 International Symposium on Smart Electric Distribution Systems and Technologies, EDST 2015. Institute of Electrical and Electronics Engineers Inc., p. 436-441 6 p. 7315248

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Intelligent buildings
Energy management systems
Domestic appliances
Electric vehicles
Energy storage
1 Citation (Scopus)

Laser-Compton scattering X-ray source based on normal conducting linac and optical enhancement cavity

Sakaue, K., Washio, M., Araki, S., Fukuda, M., Honda, Y., Terunuma, N. & Urakawa, J., 2015, 6th International Particle Accelerator Conference, IPAC 2015. Joint Accelerator Conferences Website (JACoW), p. 1635-1637 3 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

conduction
cavities
augmentation
scattering
lasers
2 Citations (Scopus)

LFC with storage battery considering SOC for large-scale wind power penetration

Toge, M., Kurita, Y., Orni, T. & Iwamoto, S., 2015 Mar 23, Asia-Pacific Power and Energy Engineering Conference, APPEEC. March ed. IEEE Computer Society, Vol. 2015-March. 7065989

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Wind power
Low pass filters
Robust control
Control theory
Power generation

Method for instantly determining line drop compensator parameters of low-voltage regulator using multiple classifiers

Kikusato, H., Takahashi, N., Yoshinaga, J., Fujimoto, Y., Hayashi, Y., Kusagawa, S. & Motegi, N., 2015 Jan 30, IEEE PES Innovative Smart Grid Technologies Conference Europe. January ed. IEEE Computer Society, Vol. 2015-January. 7028851

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage regulators
Classifiers
Electric potential
Power quality
Voltage control
1 Citation (Scopus)

OLTC and multiple SVRs in distribution system by using database

Kawano, S., Yoshizawa, S., Fujimoto, Y. & Hayashi, Y., 2015 Aug 5, IYCE 2015 - Proceedings: 2015 5th International Youth Conference on Energy. Institute of Electrical and Electronics Engineers Inc., 7180777

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage regulators
Electric potential
9 Citations (Scopus)

On detection of cyber attacks against voltage control in distribution power grids

Isozaki, Y., Yoshizawa, S., Fujimoto, Y., Ishii, H., Ono, I., Onoda, T. & Hayashi, Y., 2015 Jan 12, 2014 IEEE International Conference on Smart Grid Communications, SmartGridComm 2014. Institute of Electrical and Electronics Engineers Inc., p. 842-847 6 p. 7007753

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage control
Voltage measurement
Sensors
Distributed power generation
distribution system
1 Citation (Scopus)

Optical, structural and morphological properties of ternary thin film blend of P3HT: PCBM:ZnO nanoparticles

Bahtiar, A., Tusaddiah, S. H., Mustikasari, W. P. S., Safriani, L., Kartawidjaja, M., Kanazawa, K., Enokida, I., Furukawa, Y. & Watanabe, I., 2015, Materials Science Forum. Trans Tech Publications Ltd, Vol. 827. p. 119-124 6 p. (Materials Science Forum; vol. 827).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Zinc Oxide
Zinc oxide
Nanoparticles
zinc oxides
optical properties

Structural optimization for modulation efficiency enhancement in a top-gated graphene optical modulator

Warabi, K., Kou, R., Nishi, H., Tanabe, S., Kobayashi, Y., Yamamoto, T., Yamada, K. & Nakajima, H., 2015 Aug 10, Conference on Lasers and Electro-Optics Europe - Technical Digest. Institute of Electrical and Electronics Engineers Inc., Vol. 2015-August. 7183428

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Graphite
Structural optimization
Light modulators
Silicon
Insertion losses

Terahertz polarization determination by passive control of vectorial vortex beam

Wakayama, T., Yonemura, M., Higashiguchi, T., Oikawa, H., Sakaue, K., Washio, M., Yoshizawa, T., Tyo, J. S. & Otani, Y., 2015 Nov 9, 2015 IEEE Photonics Conference, IPC 2015. Institute of Electrical and Electronics Engineers Inc., p. 228-229 2 p. 7323608

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Vortex flow
Polarization
Inverse problems
Linear systems

Ultrafine ferroelectric nanostructure in layered Mg: LiNbO3 thin film

Okada, T., Shimizu, M., Horikawa, S., Utsugida, T., Fujii, K., Kurimura, S. & Nakajima, H., 2015 Aug 10, Conference on Lasers and Electro-Optics Europe - Technical Digest. Institute of Electrical and Electronics Engineers Inc., Vol. 2015-August. 7183791

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ferroelectric materials
Nanostructures
insulators
Fabrication
Thin films
2014

Bandwidth of backward second harmonic generation in ultrafine-structured LiNbO<inf>3</inf> waveguide

Kurimura, S., Shimizu, M., Utsugida, T., Horikawa, S., Fujii, K. & Nakajima, H., 2014 Nov 16, Advanced Solid State Lasers, ASSL 2014. Optical Society of America (OSA)

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ridge waveguides
Harmonic generation
Waveguides
Bandwidth
Phase matching
1 Citation (Scopus)

CW backward second harmonic generation with 720 nm-period domains in a QPM adhered-ridge waveguide

Shimizu, M., Utsugida, T., Horikawa, S., Fujii, K., Kurimura, S. & Nakajima, H., 2014, Conference on Lasers and Electro-Optics Europe - Technical Digest. Institute of Electrical and Electronics Engineers Inc., Vol. 2014-January. 6990006

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Ridge waveguides
Harmonic generation
ridges
harmonic generations
waveguides
2 Citations (Scopus)

Design and motion control of self-propelled droplets

Suzuki, A., Maeda, S., Hara, Y. & Hashimoto, S., 2014, Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS). Institute of Electrical and Electronics Engineers Inc., p. 310-313 4 p. 6765638

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Motion control
Oils
1,6-diaminohexane
oils
Anhydrides
2 Citations (Scopus)

Novel voltage control of multiple step voltage regulators in a distribution system

Yoshizawa, S., Yamamoto, Y., Yoshinaga, J., Hayashi, Y., Sasaki, S., Shigetou, T. & Nomura, H., 2014, 2014 IEEE PES Innovative Smart Grid Technologies Conference, ISGT 2014. IEEE Computer Society, 6816463

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage regulators
Voltage control
Electric potential

Q factor variation in graphene-loaded silicon ring resonators

Kou, R., Tsuchizawa, T., Warabi, K., Yamamoto, T., Hibino, H., Nakajima, H. & Yamada, K., 2014, Conference on Lasers and Electro-Optics Europe - Technical Digest. Institute of Electrical and Electronics Engineers Inc., Vol. 2014-January. 6989557

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Graphite
Silicon
Graphene
Numerical analysis
Q factors
1 Citation (Scopus)

Supernova constraints on neutrino oscillation and EoS for proto-neutron star

Kajino, T., Aoki, W., Cheoun, M. K., Hayakawa, T., Hidaka, J., Hirai, Y., Mathews, G. J., Nakamura, K., Shibagaki, S. & Suzuki, T., 2014, AIP Conference Proceedings. American Institute of Physics Inc., Vol. 1594. p. 319-325 7 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

neutron stars
supernovae
equations of state
neutrinos
oscillations

Three-dimensional simulation of a rotating supernova

Nakamura, K., Kuroda, T., Takiwaki, T. & Kotake, K., 2014, AIP Conference Proceedings. American Institute of Physics Inc., Vol. 1594. p. 290-295 6 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

supernovae
explosions
neutrinos
simulation
shock
1 Citation (Scopus)

Verification of efficiency of searching methods determining optimal control parameters of advanced SVRs

Yamamoto, Y., Yoshizawa, S., Yoshinaga, J., Hayashi, Y., Sasaki, S., Shigetou, T. & Nomura, H., 2014, ENERGYCON 2014 - IEEE International Energy Conference. IEEE Computer Society, p. 1076-1082 7 p. 6850558

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage regulators
Voltage control
Solar power generation
Electric potential
5 Citations (Scopus)

Voltage control of multiple step voltage regulators by renewing control parameters

Yoshizawa, S., Yamamoto, Y., Yoshinaga, J., Hayashi, Y., Sasaki, S., Shigetou, T. & Nomura, H., 2014 Feb 10, Proceedings - 2014 Power Systems Computation Conference, PSCC 2014. Institute of Electrical and Electronics Engineers Inc., 7038466

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage regulators
Voltage control
Electric potential
Tabu search
Numerical methods
2013
1 Citation (Scopus)

Active gel locomotion

Maeda, S., Kato, T., Takahashi, K. & Hashimoto, S., 2013, 2013 International Symposium on Micro-NanoMechatronics and Human Science, MHS 2013. IEEE Computer Society, 6710468

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gels
Polymers
Hydrogels
Muscle
Actuators
2 Citations (Scopus)

A self-assembling method for polymer gel components

Katayama, S., Maeda, S., Hara, Y. & Hashimoto, S., 2013, 2013 IEEE International Conference on Robotics and Biomimetics, ROBIO 2013. IEEE Computer Society, p. 79-84 6 p. 6739439

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Polymers
Gels
Coulomb interactions
Static Electricity
Self assembly
4 Citations (Scopus)

Four-dimensional viewing direction control by principal vanishing points operation and its application to four-dimensional fly-through experience

Miwa, T., Sakai, Y. & Hashimoto, S., 2013, Proceedings of the 25th Australian Computer-Human Interaction Conference: Augmentation, Application, Innovation, Collaboration, OzCHI 2013. Association for Computing Machinery, p. 95-104 10 p.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Experiments
1 Citation (Scopus)

Using phase shifters for power flow adjustment following large-scale generation loss

Ogahara, R., Kawaura, Y. & Iwamoto, S., 2013, IEEE Power and Energy Society General Meeting. 6672324

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Phase shifters
Electric lines
Disasters
7 Citations (Scopus)

Water treatment through chemical transformation and elimination of organic toxin based on mesoporous nickel oxide nanocrystals

Khairy, M. & El- Safty, S. A., 2013, Advanced Materials Research. Vol. 685. p. 139-144 6 p. (Advanced Materials Research; vol. 685).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Nickel oxide
Water treatment
Nanocrystals
Catalysts
Chemical industry
2012

Capacitor control considering voltage stability for large penetration of photovoltaic power

Enomoto, A., Aida, S., Iwamoto, S., Achiwa, H., Ariyoshi, N., Shimomura, K. & Sakaeda, S., 2012, IEEE Power and Energy Society General Meeting. 6345216

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Voltage control
Capacitors
Electric potential
Power generation
Control equipment
4 Citations (Scopus)

Capsule gel robot driven by self-propelled oil droplet

Suzuki, A., Maeda, S., Hara, Y. & Hashimoto, S., 2012, IEEE International Conference on Intelligent Robots and Systems. p. 2180-2185 6 p. 6385738

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Gels
Robots
Membranes
Water
Alginate