Neuerwerbungen im Juni 2024
Fach: Physik, Astronomie
Universitätsbibliothek HeidelbergStand: 01.07.2024 09:00 – Anzahl der Neuerwerbungen: 66
-
Advances in Non-Destructive Evaluation : Select Proceedings of NDE 2022 / edited by Bikash Ghose, Ravibabu Mulaveesala, Phani Mylavarapu. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(VIII, 195 p. 155 illus., 135 illus. in color.)
(Lecture Notes in Mechanical Engineering) -
Advances in Risk and Reliability Modelling and Assessment : Proceedings of 5th International Conference on Reliability Safety and Hazard (ICRESH 2024) / edited by Prabhakar V. Varde, Gopika Vinod, N. S. Joshi. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XVIII, 895 p. 407 illus., 339 illus. in color.)
(Lecture Notes in Mechanical Engineering) -
Bluestein, Howard B.: The architecture of clouds / Howard B. Bluestein, School of Meteorology, University of Oklahoma. -
Oxford, United Kingdom: Oxford University Press, [2024]. - xv, 540 Seiten : IllustrationenSignaturen:- UBN/UT 8000 B658
-
Byl, Achim: Data-driven measures for dose reduction and image quality enhancement in computed tomography / put forward by M.Sc. Achim Jan Byl ; referees: Prof. Dr. Joao Seco [und ein weiterer Gutachter]. -
Heidelberg, 2024. - 1 Online-Ressource (XVI, 128 Seiten) : Illustrationen, Diagramme -
Ciupek, Michael Rudolf: Using spectator neutrons to determine the fluctuating shapes of the QGP droplets created in heavy-ion collisions at the LHC / put forward by Michael Rudolf Ciupek ; referees: Prof. Dr. Silvia Masciocchi, Prof. Dr. Norbert Herrmann. -
Heidelberg, [2024?]. - xi, 182 Seiten : Illustrationen, DiagrammeSignaturen:- 2024 U 501
-
Costa Cruz Pinto, José Joaquim: Analytical Molecular Dynamics of Amorphous Condensed Matter : Thermal and Non-equilibrium Response Behavior / by José Joaquim Costa Cruz Pinto, José Reinas dos Santos André. - 1st ed. 2024.. -
Cham: Springer International Publishing, 2024.. - 1 Online-Ressource(XXXI, 308 p. 121 illus., 17 illus. in color.)
(Springer Series in Materials Science ; 342) -
Demasi, Luciano: Introduction to Unsteady Aerodynamics and Dynamic Aeroelasticity / by Luciano Demasi. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XXIII, 831 p. 232 illus., 230 illus. in color.) -
Electrochemical Exfoliation of Graphene and Its Derivatives : Commercial Applications / edited by Raju Khan, Neeraj Kumar, Mohd. Abubakar Sadique, Arpana Parihar. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XIX, 338 p. 81 illus., 69 illus. in color.)
(Engineering Materials) -
Escobar García, Carolina: Make your own sun! : let's build a model of the sun with plasticine and get to know our star! / Author: Carolina Escobar García, León Jaime Restrepo Quirós, 2022. - 10 S.
In: AstroEDU, ISSN 2748-6958. 9(2022), Artikel-ID 2202, Seite [1-10] -
Ferring-Siebert, Anna: Untersuchung des niederfrequenten Flussrauschens in dc-SQUIDs bei Temperaturen unter 1K / vorgelegt von M.Sc. Anna Ferring-Siebert ; Prüfer: Prof. Dr. Christian Enss, Prof. Dr. Maurits Haverkort. -
Heidelberg, [2024?]. - iv, 235 Seiten : Illustrationen, DiagrammeSignaturen:- 2024 U 508
-
Gangopadhyay, Gautam: Rhythm in the Sky : Periodic Motions in the Universe / by Gautam Gangopadhyay, Anirban Kundu. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XV, 211 p. 74 illus., 46 illus. in color.)
(Studies in Rhythm Engineering) -
Garcia-Calderón, Daniel: Investigating hydrogen peroxide production under different radiation modalities in non-small-cell lung cancer celllines / put forward by Daniel Alberto Garcia Calderon ; referees Prof. Dr. Joao Seco, Prof. Dr. Christian Karger. -
Heidelberg, 11 Jun. 2024. - 1 Online-Ressource (107 Seiten) : Illustrationen, Diagramme -
Gargiulo, Simone: Electromagnetic Processes of Nuclear Excitation : From Direct Photoabsorption to Free Electron and Muon Capture / by Simone Gargiulo. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XVIII, 128 p. 67 illus., 38 illus. in color.)
(Springer Theses, Recognizing Outstanding Ph.D. Research) -
Heimel, Theo: The flow of LHC events : generative models for LHC simulations and inference / put forward by Theo Heimel ; referees: Prof. Dr. Tilman Plehn, Prof. Dr. Björn Malte Schäfer. -
Heidelberg, [2024?]. - v, 147 Seiten : Illustrationen, DiagrammeSignaturen:- 2024 U 509
-
Heinen, Philipp: Simulation of ultracold Bose gases with the complex Langevin method / put forward by Philipp Heinen ; referees: Prof. Dr. Thomas Gasenzer, Prof. Dr. Tilman Enss. -
Heidelberg, 16 Mai 2024. - 1 Online-Ressource (148 Seiten) : Illustrationen, Diagramme -
Huang, Zhiqiu: Gamma-ray bursts and implications for particle acceleration at ultra-relativistic shocks / put forward by Zhiqiu Huang ; referees: Dr. Brian Reville [und ein weiterer Gutachter]. -
Heidelberg, 05 Jun. 2024. - 1 Online-Ressource (140 Seiten) : Illustrationen, Diagramme -
Jerg, Katharina I.: Simulation-based low-dose-rate brachytherapy treatment planning / put forward by Katharina I. Jerg ; referees: Prof. Dr. Jürgen W. Hesser [und ein weiterer Gutachter]. -
Heidelberg, 03 Jun. 2024. - 1 Online-Ressource (115 Seiten) : Illustrationen, Diagramme -
Kambouris, Manousos E.: Hybrid Warfare 2.2 : Where Biothreats Meet Irregular Operations and Cyber Warriors in the 21st Century / by Manousos E. Kambouris. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XIII, 196 p. 7 illus., 6 illus. in color.)
(Advanced Sciences and Technologies for Security Applications) -
Knapp, Marvin: Ground-based imaging of carbon dioxide and methane emission plumes / put forward by Marvin Harald Knapp ; referees: Prof. Dr. André Butz [und ein weiterer Gutachter]. -
Heidelberg, 05 Jun. 2024. - 1 Online-Ressource (xiv, 164 Seiten) : Illustrationen, Diagramme -
Kollmann, Wolfgang: Navier-Stokes Turbulence : Theory and Analysis / by Wolfgang Kollmann. - 2nd ed. 2024.. -
Cham: Springer International Publishing, 2024.. - 1 Online-Ressource(XII, 825 p. 163 illus., 122 illus. in color.) -
Kougioumtzoglou, Ioannis A.: Path Integrals in Stochastic Engineering Dynamics / by Ioannis A. Kougioumtzoglou, Apostolos F. Psaros, Pol D. Spanos. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XIII, 228 p. 73 illus., 67 illus. in color.) -
Kroh, Florian: Data-driven extraction of a physically interpretable model describing amide proton transfer-weighted imaging in the human brain / put forward by Florian Kroh ; referees: Prof. Dr. Mark E. Ladd, Prof. Dr. Leif Schröder. -
Heidelberg, [2024?]. - v, 123, XXXII Seiten : Illustrationen, DiagrammeSignaturen:- 2024 U 545
-
Kromer, Kathrin: Mass measurements on highly charged lead and uranium ions with the Penning-trap mass spectrometer Pentatrap / put forward by Kathrin M.E. Kromer ; referees: Prof. Dr. Klaus Blaum, Prof. Dr. Selim Jochim. -
Heidelberg, 12 Jun. 2024. - 1 Online-Ressource (iii, 79 Seiten) : Illustrationen, Diagramme -
Kronk, Gary W.: Catalog of Unconfirmed Comets - Volume 2 : 1900 to the Present / by Gary W. Kronk, Maik Meyer. - 1st ed. 2024.. -
Cham: Springer International Publishing, 2024.. - 1 Online-Ressource(XXII, 414 p. 96 illus.)
(Historical & Cultural Astronomy) -
Küspert, Ruben: Testing higher order corrections to string compactifications through kinetic mixing and inflation / put forward by Ruben Hans Thies Küspert ; referees: Prof. Dr. Arthur Hebecker, Prof. Dr. Razvan Gurau. -
Heidelberg, [2024?]. - xv, 175 Seiten : Illustrationen, DiagrammeSignaturen:- 2024 U 513
-
Licht, Christian: Advancing sodium multi-quantum coherences MRI on clinical scanners / vorgelegt von Christian Licht, M.Sc. ; Referent: Prof. Dr. rer. nat. Lothar R. Schad. -
Heidelberg, 20 Jun. 2024. - 1 Online-Ressource (xx, 113 Seiten) : Illustrationen, Diagramme -
Lisyansky, Alexander A.: Quantum Optics of Light Scattering / by Alexander A. Lisyansky, Evgeny S. Andrianov, Alexey P. Vinogradov, Vladislav Yu. Shishkov. - 1st ed. 2024.. -
Cham: Springer International Publishing, 2024.. - 1 Online-Ressource(XI, 303 p. 23 illus., 22 illus. in color.)
(Springer Series in Optical Sciences ; 249) -
Lysakovski, Peter: MonteRay : a fast Monte Carlo dose engine for protons, helium ions and carbon ions / put forward by Peter Lysakovski ; referees Prof. Dr. Dr. Jürgen Debus, Prof. Dr. Oliver Jäkel. -
Heidelberg, 11 Jun 2024. - 1 Online-Ressource (xi, 135 Seiten) : Illustrationen, Diagramme -
Maegochi, Shun: Nonequilibrium Phase Transitions in Driven Vortex Matter : The Reversible-Irreversible Transition, Dynamical Ordering, and Kibble-Zurek Mechanism / by Shun Maegochi. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XII, 101 p. 50 illus., 46 illus. in color.)
(Springer Theses, Recognizing Outstanding Ph.D. Research) -
Merino, Jaime: Many-Body Techniques in Condensed Matter Physics : Lecture Notes and Exercises for an Introductory Course / by Jaime Merino, Alfredo Levy Yeyati. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XIII, 214 p. 49 illus., 20 illus. in color.)
(UNITEXT for Physics) -
Nanocomposite and Nanocrystalline Materials and Coatings : Microstructure, Properties and Applications / edited by Alexander D. Pogrebnjak, Yang Bing, Martin Sahul. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(VIII, 236 p. 134 illus., 97 illus. in color.)
(Advanced Structured Materials ; 214) -
New Achievements in Mechanics : A Tribute to Klaus Peter Herrmann / edited by Wolfgang H. Müller, Alfons Noe, Ferdinand Ferber. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(Approx. 350 p.)
(Advanced Structured Materials ; 205) -
Novel Aspects of Diamond II : Science and Technology / edited by Soumen Mandal, Nianjun Yang. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XVIII, 519 p. 285 illus., 230 illus. in color.)
(Topics in Applied Physics ; 149) -
Ocaya, Richard: Extraction of Semiconductor Diode Parameters : A Comparative Review of Methods and Materials / by Richard Ocaya. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XIX, 174 p. 86 illus., 62 illus. in color.) -
Ossi, Paolo M.: Disordered Materials : An Introduction / by Paolo M. Ossi. - 3rd ed. 2024.. -
Berlin, Heidelberg: Springer Berlin Heidelberg, 2024.. - 1 Online-Ressource(XII, 373 p. 226 illus., 18 illus. in color.)
(Graduate Texts in Physics) -
Pato, Mauricio Porto: Pseudo-Hermitian Random Matrices / by Mauricio Porto Pato. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XVII, 178 p. 58 illus., 49 illus. in color.) -
Physics of Granular Suspensions : Micro-mechanics of Geophysical Flows / edited by Marco Mazzuoli, Laurent Lacaze. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(VII, 224 p. 92 illus., 76 illus. in color.)
(CISM International Centre for Mechanical Sciences, Courses and Lectures ; 612) -
Pirner, Hans J.: Fast alles besteht aus Quarks : Erinnerungen eines Physikers / Hans-Jürgen Pirner. -
Heidelberg: Universitätsbibliothek Heidelberg, 2024. - 209 SeitenSignaturen:- UBN/UB 3262 P667
-
Proceedings of the 7th International Conference on Materials Engineering and Nanotechnology 2023 (ICMEN 2023); 04-05 Nov, Kuala Lumpur, Malaysia : Innovative Approach and Recent Developments in Materials Engineering & Nanotechnology / edited by Ching Yern Chee, Cong Wang. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(VIII, 320 p. 175 illus., 138 illus. in color.)
(Springer Proceedings in Physics ; 1068) -
Proceedings of the International Conference on Radioscience, Equatorial Atmospheric Science and Environment and Humanosphere Science : INCREASE 2023, 21–22 Nov, Indonesia / edited by Sopia Lestari, Heru Santoso, Marfasran Hendrizan, Trismidianto, Ginaldi Ari Nugroho, Afif Budiyono, Sri Ekawati. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XXXV, 916 p. 360 illus., 339 illus. in color.)
(Springer Proceedings in Physics ; 305) -
Progress in Ultrafast Intense Laser Science XVII / edited by Kaoru Yamanouchi, Louis F. DiMauro, Wendell T. Hill, III. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XIV, 215 p. 113 illus., 92 illus. in color.)
(Topics in Applied Physics ; 151) -
Qudrat-Ullah, Hassan: Systems Thinking for Sustainability Education in Business Schools / by Hassan Qudrat-Ullah. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XII, 72 p. 5 illus., 3 illus. in color.)
(SpringerBriefs in Complexity) -
Ramsey, Gordon P.: The Physics of Music : Integrating the Technical and Artistic Aspects of Creating Music / by Gordon P. Ramsey. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XIX, 366 p. 233 illus., 185 illus. in color.)
(Undergraduate Lecture Notes in Physics) -
Reh, Moritz: From spin systems to Bose-Einstein condensates : computational approaches to strongly correlated quantum many-body systems / put forward by Moritz Reh ; referees: Prof. Dr. Martin Gärttner, Prof. Dr. Björn Malte Schäfer. -
Heidelberg, February 2024. - xiii, 166 Seiten : Illustrationen, DiagrammeSignaturen:- 2024 U 541
-
Rham, Claudia de: Die Schönheit des Fallens : auf der Suche nach dem Geheimnis der Gravitation / Claudia de Rham ; aus dem Englischen von Hainer Kober unter Beratung von Dr. Markus Pössel. - 1. Auflage. -
Berlin: Aufbau, 2024. - 269 Seiten : IllustrationenSignaturen:- UBN/UB 5040 R468
-
Rothman, Tony: Ein kleines Buch über den Ursprung des Universums / Tony Rothman ; übersetzt von Monika Niehaus und Bernd Schuh. - Deutsche Erstausgabe. -
Hamburg: Rowohlt Taschenbuch Verlag, Juni 2023. - 203 Seiten : Illustrationen
(rororo)Signaturen:- UBN/UB 5260 R845
-
Sanford, Thomas: A Whirlwind History of the Universe and Mankind : From the Big Bang to the Higgs Boson / by Thomas Sanford. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XVIII, 235 p. 1 illus.) -
Sang, David: Physics : 100 ideas in 100 words : a whistle-stop tour of key concepts / David Sang. -
London: Dorling Kindersley, 2024. - 191 Seiten : DiagrammeSignaturen:- UBN/UB 5020 S225
-
Schilizzi, Richard T.: The Square Kilometre Array : A Science Mega-Project in the Making, 1990-2012 / by Richard T. Schilizzi, Ronald D. Ekers, Peter E. Dewdney, Philip Crosby. - 1st ed. 2024.. -
Cham: Springer International Publishing, 2024.. - 1 Online-Ressource(XXXIX, 614 p. 147 illus., 136 illus. in color.)
(Historical & Cultural Astronomy) -
Schweiger, Christoph: High-precision penning-trap determination of the electron capture Q-value in 163Ho for the determination of the electron neutrino mass / put forward by Christoph Schweiger ; thesis referees Prof. Dr. Klaus Blaum, Prof. Dr. Skyler Degenkolb. -
Heidelberg, February 2024. - ix, 93 SeitenSignaturen:- 2024 U 547
-
Sekine, Toshimori: Shock-Induced Chemistry / by Toshimori Sekine. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XI, 126 p. 65 illus., 45 illus. in color.)
(Shock Wave and High Pressure Phenomena) -
Selected Problems of Solid Mechanics and Solving Methods / edited by Holm Altenbach, Viacheslav Bogdanov, Alexander Ya. Grigorenko, Roman M. Kushnir, Vladimir M. Nazarenko, Victor A. Eremeyev. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XII, 532 p. 203 illus., 79 illus. in color.)
(Advanced Structured Materials ; 204) -
Selstø, Sølve: A computational introduction to quantum physics / Sølve Selstø (Oslo Metropolitan University). -
Cambridge, United Kingdom ; New York, NY, USA ; Port Melbourne, VIC, Australia ; New Delhi, India ; Singapore: Cambridge University Press, 2024. - xiii, 180 Seiten : Illustrationen, DiagrammeSignaturen:- UBN/UK 1000 S468
-
Sillerud, Laurel O.: Abiogenesis : The Physical Basis for Living Systems / by Laurel O. Sillerud. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XVIII, 847 p. 370 illus., 324 illus. in color.) -
Solar-Terrestrial Relations and Physics of Earthquake Precursors : Proceedings of the XIII International Conference / edited by Alexei Dmitriev, Janos Lichtenberger, Oksana Mandrikova, Emmanuel Nahayo. - 1st ed. 2023.. -
Cham: Springer Nature Switzerland, 2023.. - 1 Online-Ressource(XVIII, 286 p. 130 illus., 99 illus. in color.)
(Springer Proceedings in Earth and Environmental Sciences) -
Special Topics in Quantum Optics / edited by Weiping Zhang, Zeng-Bing Chen. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(V, 226 p. 150 illus.) -
Spratte, Tobias: Tailoring actuation properties of thermoresponsive hydrogels and implementation into soft robotic applications / vorgelegt von Herrn Tobias Spratte ; 1. Gutachterin: Prof. Dr. Christine Selhuber-Unkel, 2. Gutachterin: Prof. Dr. Eva Blasco. -
Heidelberg, November 2023. - vi, 102 Seiten : Illustrationen, DiagrammeSignaturen:- 2024 U 503
-
Stefanucci, Gianluca: Quantum Mechanics for Material Science : An Introduction / by Gianluca Stefanucci. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XI, 238 p. 19 illus., 9 illus. in color.) -
Steinacker, Harold C.: Quantum geometry, matrix theory, and gravity / Harold C. Steinacker (University of Vienna, Austria). -
Cambridge, United Kingdom ; New York, NY, USA ; Port Melbourne, VIC, Australia ; New Delhi, India ; Singapore: Cambridge University Press, 2024. - xvi, 402 SeitenSignaturen:- UBN/UO 4000 S819
-
Tang, Haibin: Introduction to plasmas and plasma dynamics : with plasma physics applications to space propulsion, magnetic fusion and space physics / Haibin Tang, Thomas M. York. - Second edition. -
London ; San Diego, CA ; Cambridge, MA: Academic Press, [2024]. - 1 Online-Ressource (xiii, 405 Seiten) : Illustrationen -
The 25th European Conference on Integrated Optics : Proceedings of ECIO 2024, June 17–19, Aachen, Germany / edited by Jeremy Witzens, Joyce Poon, Lars Zimmermann, Wolfgang Freude. - 1st ed. 2024.. -
Cham: Springer Nature Switzerland, 2024.. - 1 Online-Ressource(XXIV, 598 p. 341 illus., 329 illus. in color.)
(Springer Proceedings in Physics ; 402) -
The Physics of Semiconductor Devices : Proceedings of IWPSD 2021 / edited by Rajendra Singh, Madhusudan Singh, Ashok Kapoor. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(XXII, 410 p. 253 illus., 229 illus. in color.)
(Springer Proceedings in Physics ; 306) -
Vsemirnova, Ekaterina: Introduction to physics : Ekaterina Vsemirnova. - SeitenSignaturen:
- UBN/UC 100 V985
-
Wang, Hui: The Millimeter Wave Synthetic Aperture Radar Technology / by Hui Wang. - 1st ed. 2024.. -
Singapore: Springer Nature Singapore, 2024.. - 1 Online-Ressource(X, 362 p. 258 illus., 187 illus. in color.) -
Yu. Kagan, Maxim: Electronic Phase Separation in Magnetic and Superconducting Materials : Recent Advances / by Maxim Yu. Kagan, Kliment I. Kugel, Alexander L. Rakhmanov, Artem O. Sboychakov. - 1st ed. 2024.. -
Cham: Springer International Publishing, 2024.. - 1 Online-Ressource(XV, 379 p. 124 illus., 85 illus. in color.)
(Springer Series in Solid-State Sciences ; 201) -
Zhang, Guo-ping: Quantum mechanics / Guo-Ping Zhang, Mingsu Si, Thomas F. George. -
Berlin ; Boston: De Gruyter, [2024]. - XXII, 368 Seiten : Illustrationen, Diagramme
(De Gruyter textbook)Signaturen:- UBN/UK 1000 Z63
Gehe zu: |
|
Diese Neuerwerbungslisten werden jeweils zu Beginn eines Monats für die im vorhergehenden Monat erworbenen Medien erstellt.
Aus technischen Gründen kann ein Medium jeweils nur einem einzigen Fachgebiet zugeordnet werden. Für Medien mit fachübergreifendem Inhalt empfiehlt es sich daher, in allen in Frage kommenden Fachgebietslisten zu recherchieren.