Chemical Engineering kategória termékei

Mayhew, Lance J.: Rum Made Me Do It idegen
idegen
Mayhew, Lance J.

Rum Made Me Do It - 60 Tantalisingly Tropical Cocktails

HarperCollins Publishers, 2023

Online ár:

7 107 Ft

Eredeti ár: 7 481 Ft

Lucas, Chester L.: Drop-Forging Dies and Die-Sinking idegen
idegen
Lucas, Chester L.

Drop-Forging Dies and Die-Sinking

Owen Press, 2016

This vintage book contains a detailed guide to drop-forging dies and die-sinking. With authentic photographs, helpful illustrations, and ...

Online ár:

7 215 Ft

Eredeti ár: 7 594 Ft

Boltres, Bettine: When Glass meets Pharma idegen
idegen
Boltres, Bettine

When Glass meets Pharma - Insights about glass as primary packaging material

ECV Editio Cantor Verlag GmbH, 2015

Die Anforderungen an Primärpackmittel sind heutzutage nicht leicht zu erfüllen. Intensive optische Prüfungen, Null-Fehler-Programme und s...

Online ár:

8 249 Ft

Eredeti ár: 8 683 Ft

Sells, Paula: The Tack Room idegen
idegen
Sells, Paula

The Tack Room - The story of saddlery and harness in 27 equine disciplines

Merlin Unwin Books, 2018

The story of saddlery and harness in 27 equine disciplines.

Online ár:

15 969 Ft

Eredeti ár: 16 809 Ft

Khalifa, Hamza - Ramadhan, Aesha: A study of glucose-6-phosphate dehydrogenase deficiency idegen
idegen
Khalifa, Hamza - Ramadhan, Aesha

A study of glucose-6-phosphate dehydrogenase deficiency

LAP LAMBERT Academic Publishing, 2020

The study included dividing the research into five chapters, which are covered in the first chapter. Chapter two of the chemical composit...

Online ár:

16 529 Ft

Eredeti ár: 17 398 Ft

Adams, Thomas: Learn Aspen Plus in 24 Hours idegen
idegen
Adams, Thomas

Learn Aspen Plus in 24 Hours

McGraw-Hill Education Ltd, 2022

This fully updated guide shows how to quickly start using the current version of Aspen Plus to solve chemical engineering problems Discov...

Online ár:

19 188 Ft

Eredeti ár: 20 197 Ft

Betz, Michael: Modellierung und Optimierung der strömungstechnischen Vorgänge in Abweiseradsichtern idegen
idegen
Betz, Michael

Modellierung und Optimierung der strömungstechnischen Vorgänge in Abweiseradsichtern

Karlsruher Institut fr Technologie (KIT), 2022

Abweiseradsichter sind verfahrenstechnische Maschinen, die bei der Klassierung von Gas-Partikel-Gemischen zum Einsatz kommen. Das Ziel di...

Online ár:

19 505 Ft

Eredeti ár: 20 531 Ft

Bruder, Ulf: User's Guide to Plastic 2E idegen
idegen
Bruder, Ulf

User's Guide to Plastic 2E - A Handbook for Everyone

Hanser Publications, 2019

Many technical books about plastics are too theoretical and difficult to read. The intention of this book is to offer something completel...

Online ár:

18 788 Ft

Eredeti ár: 19 776 Ft

Superfoods idegen
idegen

Superfoods - Cultural and Scientific Perspectives

Springer International Publishing AG, 2023

Superfoods have come to the forefront of the public imagination due to a combination of presumed health benefits and cultural mystique. M...

Online ár:

24 408 Ft

Eredeti ár: 25 692 Ft

Hofmann, Matthias: Data Management for Natural Scientists idegen
idegen
Hofmann, Matthias

Data Management for Natural Scientists - A Practical Guide to Data Extraction and Storage Using Python

De Gruyter, 2023

Data Management for Natural Scientists offers a practical guide for scientific processing of data. It covers the way from "getting hands ...

Online ár:

26 943 Ft

Eredeti ár: 28 361 Ft

Elzagheid, Mohamed: Water Chemistry, Analysis and Treatment idegen
idegen
Elzagheid, Mohamed

Water Chemistry, Analysis and Treatment - Pollutants, Microbial Contaminants, Water and Wastewater Treatment

de Gruyter, Walter, GmbH, 2023

Water chemistry, water sources, water pollutants, and microbiological contaminants are all covered in the book. The basic concepts of wat...

Online ár:

28 991 Ft

Eredeti ár: 30 516 Ft

Schiller, Gary F.: A Practical Approach to Scientific Molding idegen
idegen
Schiller, Gary F.

A Practical Approach to Scientific Molding

Hanser Publications, 2024

This easy-to-understand guide provides the necessary information to implement a scientific molding program. It is a hands-on reference fo...

Online ár:

29 057 Ft

Eredeti ár: 30 586 Ft

Metallic Nanomaterials (Part B) idegen
idegen

Metallic Nanomaterials (Part B)

De Gruyter, 2018

This book presents latest research results on synthesis and application of metallic nanomaterials. Fabrication techniques, analytic prope...

Online ár:

32 362 Ft

Eredeti ár: 34 065 Ft

Burkin, A R: CHEMICAL HYDROMETALLURGY idegen
idegen
Burkin, A R

CHEMICAL HYDROMETALLURGY - THEORY AND PRINCIPLES

ICP, 2001

This book is based on the undergraduate and MSc courses in hydrometallurgy which Professor A R Burkin gave from 1961 until he retired in ...

Online ár:

32 411 Ft

Eredeti ár: 34 116 Ft

Jaroschek, Christoph: Design of Injection Molded Plastic Parts idegen
idegen
Jaroschek, Christoph

Design of Injection Molded Plastic Parts

Hanser Publications, 2022

This book creates a new perspective on the design of plastic parts. In many books there is a strong focus on the material, the material p...

Online ár:

33 217 Ft

Eredeti ár: 34 965 Ft

Mason, Timothy J. - Vinatoru, Mircea: Sonochemistry idegen
idegen
Mason, Timothy J. - Vinatoru, Mircea

Sonochemistry - Fundamentals and Evolution

De Gruyter, 2023

In the 1980's sonochemistry was considered to be a rather restricted branch of chemistry mainly involving the ways in which ultrasound co...

Online ár:

33 161 Ft

Eredeti ár: 34 906 Ft

Elzagheid, Mohamed: Chemical Laboratory idegen
idegen
Elzagheid, Mohamed

Chemical Laboratory - Safety and Techniques

De Gruyter, 2022

This book covers techniques in the chemical laboratory and safety procedures that are crucial to making the laboratory a safe workplace. ...

Online ár:

35 201 Ft

Eredeti ár: 37 053 Ft

Haan, André B. de - Padding, Johan T.: Process Technology idegen
idegen
Haan, André B. de - Padding, Johan T.

Process Technology - An Introduction

De Gruyter, 2022

The book provides a general overview about process technology. It focuses on the structure and development of production processes, main ...

Online ár:

35 327 Ft

Eredeti ár: 37 186 Ft

Rabnawaz, Muhammad: Sustainable Packaging Materials idegen
idegen
Rabnawaz, Muhammad

Sustainable Packaging Materials - Winning Solutions

Hanser Publications, 2023

"Sustainable Packaging Materials" provides a concise introduction to the principles and practices of packaging sustainability. It address...

Online ár:

37 284 Ft

Eredeti ár: 39 246 Ft

Corrosion Prevention Nanoscience idegen
idegen

Corrosion Prevention Nanoscience - Nanoengineering Materials and Technologies

De Gruyter, 2023

Recently, surface-engineered and modified nanomaterials have been developed as corrosion inhibitors for different metals alloys in coatin...

Online ár:

37 280 Ft

Eredeti ár: 39 242 Ft

Rudolph, Natalie - Kiesel, Raphael - Aumnate, Chuanchom: Understanding Plastics Recycling idegen
idegen
Rudolph, Natalie - Kiesel, Raphael - Aumnate, Chuanchom

Understanding Plastics Recycling - Economic, Ecological, and Technical Aspects of Plastic Waste Handling

Hanser Publications, 2020

This book shows the true and often-underestimated market potential of plastics recycling, with analysis from economic, ecological, and te...

Online ár:

37 303 Ft

Eredeti ár: 39 266 Ft

Benvenuto, Mark Anthony: Industrial Chemistry idegen
idegen
Benvenuto, Mark Anthony

Industrial Chemistry

de Gruyter, Walter, GmbH, 2023

Industrial Chemistry examines the chemical processes performed in industry and looks at how they affect our livesby discussing the by-pro...

Online ár:

37 280 Ft

Eredeti ár: 39 242 Ft

Sharma, Surbhi: Membranes for Low Temperature Fuel Cells idegen
idegen
Sharma, Surbhi

Membranes for Low Temperature Fuel Cells - New Concepts, Single-Cell Studies and Applications

De Gruyter, 2019

Membranes for Low Temperature Fuel Cells provides a comprehensive review of novel and state-of-the-art polymer electrolyte membrane fuel ...

Online ár:

39 338 Ft

Eredeti ár: 41 408 Ft

Ratna, Debdatta - Chakraborty, Bikash Chandra: Polymer Matrix Composite Materials idegen
idegen
Ratna, Debdatta - Chakraborty, Bikash Chandra

Polymer Matrix Composite Materials - Structural and Functional Applications

De Gruyter, 2023

The book provides accessible and comprehensive information on polymer matrix composites. It presents the basic concept of design of compo...

Online ár:

41 489 Ft

Eredeti ár: 43 672 Ft

Hopmann, Christian - Greif, Helmut - Wolters, Leo: Training in Plastics Technology idegen
idegen
Hopmann, Christian - Greif, Helmut - Wolters, Leo

Training in Plastics Technology

Hanser Publications, 2023

This text- and workbook provides a clearly written, comprehensive introduction to the major topics associated with plastics technology, f...

Online ár:

41 512 Ft

Eredeti ár: 43 696 Ft

Wong, Anthony Chi-Ying: Powder Technology in Plastics Processing idegen
idegen
Wong, Anthony Chi-Ying

Powder Technology in Plastics Processing

Hanser Publications, 2021

Industrial processes involving handling of solid raw materials are highly dependent on our understanding of the fundamental characteristi...

Online ár:

37 307 Ft

Eredeti ár: 39 270 Ft

Andersen, Paul G. - Campbell, Gregory A.: Extruder Processing idegen
idegen
Andersen, Paul G. - Campbell, Gregory A.

Extruder Processing - Comparison of Single- and Twin-Screw Extruders for Optimal Solids Conveying, Melting, and Mixing

Hanser Publications, 2022

Single-screw or twin-screw extruder? When the need to produce a homogeneous polymer melt occurs in the industrial environment, both produ...

Online ár:

41 496 Ft

Eredeti ár: 43 680 Ft

Voet, Vincent - Jager, Jan - Folkersma, Rudy: Plastics in the Circular Economy idegen
idegen
Voet, Vincent - Jager, Jan - Folkersma, Rudy

Plastics in the Circular Economy

De Gruyter, 2021

We cannot imagine a world without plastics. Plastic products make our daily life safe, healthy and convenient. Besides all the benefits, ...

Online ár:

41 444 Ft

Eredeti ár: 43 625 Ft

Wampfler, Bruno - Affolter, Samuel - Ritter, Axel - Schmid, Manfred: Measurement Uncertainty in Analysis of Plastics idegen
idegen
Wampfler, Bruno - Affolter, Samuel - Ritter, Axel - Schmid, Manfred

Measurement Uncertainty in Analysis of Plastics - Evaluation by Interlaboratory Test Results

Hanser Publications, 2022

Measurement uncertainty is an important component of modern materials analysis: it indicates the boundaries within which the test results...

Online ár:

41 478 Ft

Eredeti ár: 43 661 Ft

Chejne Janna, Farid - Garcia-Perez, Manuel - Noriega E., Maria del Pilar: Applications of Biomass-Derived Materials for Bioproducts and Bioenergy idegen
idegen
Chejne Janna, Farid - Garcia-Perez, Manuel - Noriega E., Maria del Pilar

Applications of Biomass-Derived Materials for Bioproducts and Bioenergy

Hanser Publications, 2023

This book offers a unique overview of usage of biomass, biomaterials, and bioproducts, including biopolymers. Included are materials, pro...

Online ár:

41 496 Ft

Eredeti ár: 43 680 Ft

Sagir, Muhammad - Mushtaq, Muhammad - Shaik, Abdul Ravoof - Tahir, Muhammad Bilal - Tahir, M. Suleman: Surfactants for Enhanced Oil Recovery Applications idegen
idegen
Sagir, Muhammad - Mushtaq, Muhammad - Shaik, Abdul Ravoof - Tahir, Muhammad Bilal - Tahir, M. Suleman

Surfactants for Enhanced Oil Recovery Applications

Springer International Publishing, 2020

This book provides a concise treatise on the use of surfactants in enhanced oil recovery (EOR), including information on key types of sur...

Online ár:

44 339 Ft

Eredeti ár: 46 672 Ft

Kissin, Yury V.: Polyethylene idegen
idegen
Kissin, Yury V.

Polyethylene - End-Use Properties and their Physical Meaning

Hanser Publications, 2020

This book provides a necessary bridge between the values of engineering end-use parameters of polyethylene resins and their scientific mo...

Online ár:

45 608 Ft

Eredeti ár: 48 008 Ft

Hattori, Hideshi - Ono, Yoshio: Solid Base Catalysis idegen
idegen
Hattori, Hideshi - Ono, Yoshio

Solid Base Catalysis

Springer-Verlag GmbH, 2011

The importance of solid base catalysts has come to be recognized for their environmentally benign qualities, and much significant progres...

Online ár:

44 417 Ft

Eredeti ár: 46 754 Ft

Food Science and Technology idegen
idegen

Food Science and Technology - Fundamentals and Innovation

de Gruyter, Walter, GmbH, 2023

Food Science and Technology: Fundamentals and Innovation presents the aspects of microbiology, chemistry, nutrition, and process engineer...

Online ár:

43 606 Ft

Eredeti ár: 45 901 Ft

Flow Chemistry Set Vol 1+2 idegen
idegen

Flow Chemistry Set Vol 1+2 - Fundamentals and Applications

de Gruyter, Walter, GmbH, 2021

The fully up-dated edition of the two-volume work covers both the theoretical foundation as well as the practical aspects. Presenting the...

Online ár:

45 750 Ft

Eredeti ár: 48 157 Ft

Malloy, Robert A.: Plastic Part Design for Injection Molding idegen
idegen
Malloy, Robert A.

Plastic Part Design for Injection Molding - An Introduction

Hanser, Carl, 2010

The goal of the book is to assist the designer in the development of parts that are functional, reliable, manufacturable, and aesthetical...

Online ár:

45 705 Ft

Eredeti ár: 48 110 Ft

Hopmann, Christian - Schmitz, Mauritius: Plastics Industry 4.0 idegen
idegen
Hopmann, Christian - Schmitz, Mauritius

Plastics Industry 4.0 - Potentials and Applications in Plastics Technology

Hanser Publications, 2020

"Plastics Industry 4.0" provides a sophisticated insight into the development of the plastics industry in terms of digitalization and Ind...

Online ár:

45 668 Ft

Eredeti ár: 48 071 Ft

Aerosols idegen
idegen

Aerosols - Science and Engineering

De Gruyter, 2022

Aerosol science and engineering is a vibrant field of particle technology and chemical reaction engineering. The book presents a timely a...

Online ár:

47 639 Ft

Eredeti ár: 50 146 Ft

Kazmer, David O.: Injection Mold Design Engineering idegen
idegen
Kazmer, David O.

Injection Mold Design Engineering

Hanser Publications, 2016

Inhaltsbeschreibung folgt

Online ár:

54 033 Ft

Eredeti ár: 56 876 Ft

Traut, Hartmut - Wobbe, Hans: Physical Foam Injection Molding idegen
idegen
Traut, Hartmut - Wobbe, Hans

Physical Foam Injection Molding - Fundamentals for Industrial Lightweight Design

Hanser Publications, 2024

More than half of all injection molded plastic parts can be produced more cost-effectively and with better tolerances using foam injectio...

Online ár:

49 772 Ft

Eredeti ár: 52 391 Ft

Schlutter, Ruben: Injection Molding Simulation for Beginners idegen
idegen
Schlutter, Ruben

Injection Molding Simulation for Beginners

Hanser Publications, 2023

This book offers an up-to-date, platform-independent introduction to injection molding simulation, which plays a very important role in t...

Online ár:

49 787 Ft

Eredeti ár: 52 407 Ft

Rodríguez Pérez, Miguel Angel - Martín de León, Judith - Bernardo García, Victoria: Nanocellular Polymers idegen
idegen
Rodríguez Pérez, Miguel Angel - Martín de León, Judith - Bernardo García, Victoria

Nanocellular Polymers - From Microscale to Nanoscale

De Gruyter, 2023

The book covers production, structure, properties and potential applications of nanocellular polymers fabricated by using foaming methods...

Online ár:

51 785 Ft

Eredeti ár: 54 510 Ft

Klosse, Peter: The Essence of Gastronomy idegen
idegen
Klosse, Peter

The Essence of Gastronomy - Understanding the Flavor of Foods and Beverages

Taylor & Francis, 2014

While the primary focus of most food science books is on the food's composition or its nutritional value, books on the science of gastron...

Online ár:

52 046 Ft

Eredeti ár: 54 785 Ft

Trivedi, Prakash Druman: Specialty Thermoplastics idegen
idegen
Trivedi, Prakash Druman

Specialty Thermoplastics - Preparations, Processing, Properties, Performance

Hanser Publications, 2023

Specialty thermoplastics command a US$1.2 billion market worldwide. Their use is proliferating in aerospace and transportation, medical a...

Online ár:

53 917 Ft

Eredeti ár: 56 754 Ft

Singh, R. Paul - Heldman, Dennis R. - Erdogdu, Ferruh: Introduction to Food Engineering idegen
idegen
Singh, R. Paul - Heldman, Dennis R. - Erdogdu, Ferruh

Introduction to Food Engineering

Elsevier LTD, 2024

The sixth edition of Introduction to Food Engineering, with revised and updated content, aims to enhance the learning of quantitative app...

Online ár:

53 118 Ft

Eredeti ár: 55 913 Ft

Goswami, Ajay Kumar - Baroliya, Prabhat Kumar: Heavy Metals Adsorption idegen
idegen
Goswami, Ajay Kumar - Baroliya, Prabhat Kumar

Heavy Metals Adsorption - Low-Cost Adsorbents

De Gruyter, 2022

The book reviews the state-of-the art methods developed and used to remove heavy metals. It presents both industrial waste and mineral ba...

Online ár:

55 889 Ft

Eredeti ár: 58 830 Ft

Bidanda, Bopaya: Maynard's Industrial and Systems Engineering Handbook idegen
idegen
Bidanda, Bopaya

Maynard's Industrial and Systems Engineering Handbook

McGraw-Hill Education Ltd, 2022

A completely updated edition of the classic reference for industrial and systems engineers Long considered the best reference for the dis...

Online ár:

57 651 Ft

Eredeti ár: 60 685 Ft

Dick, John S. - Pawlowski, Henry: Practical Rubber Rheology and Dynamic Properties idegen
idegen
Dick, John S. - Pawlowski, Henry

Practical Rubber Rheology and Dynamic Properties

Hanser Publications, 2023

"Practical Rubber Rheology and Dynamic Properties" provides a unique overview of rubber rheology from a practical perspective. Written by...

Online ár:

58 073 Ft

Eredeti ár: 61 129 Ft

Elliott, J. Richard - Diky, Vladimir - Knotts IV, Thomas A. - Wilding, W. Vincent: The Properties of Gases and Liquids idegen
idegen
Elliott, J. Richard - Diky, Vladimir - Knotts IV, Thomas A. - Wilding, W. Vincent

The Properties of Gases and Liquids

McGraw-Hill Education Ltd, 2023

A thoroughly revised edition of the "must have" chemical engineering reference This go-to chemical engineering guide provides you with a ...

Online ár:

57 394 Ft

Eredeti ár: 60 414 Ft

Baur, Erwin - Osswald, Tim A. - Rudolph, Natalie: Plastics Handbook idegen
idegen
Baur, Erwin - Osswald, Tim A. - Rudolph, Natalie

Plastics Handbook - The Resource for Plastics Engineers

Hanser Publications, 2020

The Plastics Handbook provides everything important there is to know about plastics, comprehensively compiled in a compact and well-organ...

Online ár:

58 208 Ft

Eredeti ár: 61 271 Ft

Wong, Anthony Chi-Ying: Polymer Extrusion idegen
idegen
Wong, Anthony Chi-Ying

Polymer Extrusion - Black-Box Reveal

Hanser Publications, 2024

Plastics extrusion is one of the most important industrial processes worldwide. Over past decades, understanding of extrusion technologie...

Online ár:

58 010 Ft

Eredeti ár: 61 063 Ft

Schmid, Manfred: Laser Sintering with Plastics idegen
idegen
Schmid, Manfred

Laser Sintering with Plastics - Technology, Processes, and Materials

Hanser Publications, 2024

Powder bed-based additive manufacturing with polymers (PBF-P) has a special position in the world of 3D printing. On the one hand, the co...

Online ár:

58 059 Ft

Eredeti ár: 61 114 Ft

Stritzke, Bernie: Custom Molding of Thermoset Elastomers: A Comprehensive Approach to Materials, Mold Design, and Processing idegen
idegen
Stritzke, Bernie

Custom Molding of Thermoset Elastomers: A Comprehensive Approach to Materials, Mold Design, and Processing

Hanser Publications, 2009

This comprehensive reference book incorporates the latest developments in the synthesis, production, characterization, and application of...

Online ár:

59 470 Ft

Eredeti ár: 62 600 Ft

Malloy, Robert A.: Plastic Part Design for Injection Molding 2e: An Introduction idegen
idegen
Malloy, Robert A.

Plastic Part Design for Injection Molding 2e: An Introduction

Hanser Publications, 2010

The goal of the book is to assist the designer in the development of parts that are functional, reliable, manufacturable, and aesthetical...

Online ár:

59 571 Ft

Eredeti ár: 62 706 Ft

Green Composites Manufacturing idegen
idegen

Green Composites Manufacturing - A Sustainable Approach

De Gruyter, 2024

In today's society researchers are more focused on cleaner materials production for environmental sustainability. This approach aims at r...

Online ár:

60 086 Ft

Eredeti ár: 63 248 Ft

Wilczynski, Krzysztof: Rheology in Polymer Processing idegen
idegen
Wilczynski, Krzysztof

Rheology in Polymer Processing - Modeling and Simulation

Hanser Publications, 2020

"Rheology in Polymer Processing" introduces the fundamentals of rheology and rheometry as the basis for modeling and computer-aided desig...

Online ár:

58 107 Ft

Eredeti ár: 61 165 Ft

Microalgae-Based Systems idegen
idegen

Microalgae-Based Systems - Process Integration and Process Intensification Approaches

De Gruyter, 2023

Process integration and intensification are means to improve the sustainability metrics of the industrial processes, balancing the pillar...

Online ár:

60 127 Ft

Eredeti ár: 63 291 Ft

Nanostructured Materials idegen
idegen

Nanostructured Materials - Applications, Synthesis and In-Situ Characterization

De Gruyter, 2023

From a political, societal and scientific point of view, it is imperative to counteract global warming and overcome energy scarcity. From...

Online ár:

62 132 Ft

Eredeti ár: 65 402 Ft

Stoessel, Francis: Thermal Safety of Chemical Processes idegen
idegen
Stoessel, Francis

Thermal Safety of Chemical Processes - Risk Assessment and Process Design

Wiley-VCH, 2020

Vollständig überarbeitete,aktualisierte 2. Auflage mit fünf neuen Kapiteln und den aktuellen IUPAC-Normen. Beschäftigt sich mit thermisch...

Online ár:

64 347 Ft

Eredeti ár: 67 733 Ft

Schubnell, Markus: Validation in Thermal Analysis idegen
idegen
Schubnell, Markus

Validation in Thermal Analysis

Hanser Publications, 2022

The validation of equipment, processes and methods is a basic requirement that nowadays has to be met in most industries. This handbook d...

Online ár:

62 271 Ft

Eredeti ár: 65 548 Ft

Árinfó

Akciós ár: a vásárláskor fizetendő akciós ár

Online ár: az internetes rendelésekre érvényes nem akciós ár

Eredeti ár: kedvezmény nélküli könyvesbolti ár

Bevezető ár: az első megjelenéshez kapcsolódó kedvezményes ár

Korábbi ár: az akciót megelőző 30 nap legalacsonyabb akciós ára

További információk

Árinfó

Akciós ár: a vásárláskor fizetendő akciós ár

Online ár: az internetes rendelésekre érvényes nem akciós ár

Eredeti ár: kedvezmény nélküli könyvesbolti ár

Bevezető ár: az első megjelenéshez kapcsolódó kedvezményes ár

Korábbi ár: az akciót megelőző 30 nap legalacsonyabb akciós ára