100 results on '"Sandak, Jakub"'
Search Results
2. Bio-based Building Skin
- Author
-
Sandak, Anna, Sandak, Jakub, Brzezicki, Marcin, and Kutnar, Andreja
- Subjects
Energy ,Sustainable architecture ,Building materials ,Biomaterials ,Sustainable development ,Buildings—Design and construction ,Building ,Construction ,Engineering, Architectural ,Structural materials ,thema EDItEUR::A The Arts::AM Architecture::AMC Architectural structure and design::AMCR Environmentally-friendly (‘green’) architecture and design ,thema EDItEUR::R Earth Sciences, Geography, Environment, Planning::RN The environment::RNU Sustainability ,thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TG Mechanical engineering and materials::TGM Materials science ,thema EDItEUR::T Technology, Engineering, Agriculture, Industrial processes::TN Civil engineering, surveying and building::TNK Building construction and materials - Abstract
This book provides a compendium of material properties, demonstrates several successful examples of bio-based materials’ application in building facades, and offers ideas for new designs and novel solutions. It features a state-of-the-art review, addresses the latest trends in material selection, assembling systems, and innovative functions of facades in detail. Selected case studies on buildings from diverse locations are subsequently presented to demonstrate the successful implementation of various biomaterial solutions, which defines unique architectural styles and building functions. The structures, morphologies and aesthetic impressions related to bio-based building facades are discussed from the perspective of art and innovation; essential factors influencing the performance of materials with respect to functionality and safety are also presented. Special emphasis is placed on assessing the performance of a given facade throughout the service life of a building, and after its end. The book not only provides an excellent source of technical and scientific information, but also contributes to public awareness by demonstrating the benefits to be gained from the proper use of bio-based materials in facades. As such, it will appeal to a broad audience including architects, engineers, designers and building contractors. ; Presents case-studies and latest trends in material selection, assembling systems, and innovative functions of facades Discusses structure morphologies and aesthetic impressions related to bio-based building facades Highlights factors influencing performance of facades, with a special focus on service life of the building
- Published
- 2019
- Full Text
- View/download PDF
3. Fungal colonisation on wood surfaces weathered at diverse climatic conditions
- Author
-
Poohphajai, Faksawat, Myronycheva, Olena, Karlsson, Olov, Belt, Tiina, Rautkari, Lauri, Sandak, Jakub, Gubenšek, Ana, Zalar, Polona, Gunde-Cimerman, Nina, and Sandak, Anna
- Published
- 2023
- Full Text
- View/download PDF
4. Lateral forces determine dimensional accuracy of the narrow-kerf sawing of wood
- Author
-
Orlowski, Kazimierz A., Chuchala, Daniel, Szczepanski, Marcin, Migda, Wojciech, Wojnicz, Wiktoria, and Sandak, Jakub
- Published
- 2022
- Full Text
- View/download PDF
5. Feasibility of portable NIR spectrometer for quality assurance in glue-laminated timber production
- Author
-
Sandak, Jakub, Niemz, Peter, Hänsel, Andreas, Mai, Juana, and Sandak, Anna
- Published
- 2021
- Full Text
- View/download PDF
6. Multi-sensor data fusion and parallel factor analysis reveals kinetics of wood weathering
- Author
-
Sandak, Jakub, Sandak, Anna, and Cocchi, Marina
- Published
- 2021
- Full Text
- View/download PDF
7. Advanced Molecular Dynamics Model for Investigating Biological-Origin Microfibril Structures.
- Author
-
Ponnuchamy, Veerapandian, Sandak, Anna, and Sandak, Jakub
- Published
- 2024
- Full Text
- View/download PDF
8. Bioinspired Living Coating System for Wood Protection: Exploring Fungal Species on Wood Surfaces Coated with Biofinish during Its Service Life.
- Author
-
Poohphajai, Faksawat, Gubenšek, Ana, Černoša, Anja, Butina Ogorelec, Karen, Rautkari, Lauri, Sandak, Jakub, and Sandak, Anna
- Subjects
WOOD ,WOOD decay ,SERVICE life ,SURFACE coatings ,AUREOBASIDIUM pullulans ,WOOD-decaying fungi ,BIOACOUSTICS - Abstract
Biofinish is an innovative wood protection system inspired by biological processes. It enhances the hydrophobicity of wood through oil treatment, resulting in improved dimensional stability. Living cells of the fungus Aureobasidium pullulans effectively protect wood from deterioration caused by other decaying fungi. The melanin pigment produced by the fungus provides an appealing dark surface and additionally protects the wood substrate against UV radiation. The significant advantage of Biofinish is its remarkable self-healing ability, which distinguishes it from conventional wood protection methods. This research aimed to explore fungal species colonising surfaces exposed to natural weathering and assess the survival of A. pullulans on wood surfaces coated with Biofinish during its in-service period. This study was performed on a facade composed of European larch wood (Larix decidua) treated with linseed oil and coated with Biofinish at the InnoRenew CoE building in Izola, Slovenia, following a 9-month exposure period. The majority of the detected species belonged to the genera Aureobasidium. The results indicated the survival and effective antagonistic action of A. pullulans, the living and active ingredient of the coating, against other wood-decaying fungi. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
9. FTIR analysis of chemical changes in wood induced by steaming and longitudinal compression
- Author
-
Báder, Mátyás, Németh, Róbert, Sandak, Jakub, and Sandak, Anna
- Published
- 2020
- Full Text
- View/download PDF
10. Damage progression analysis in a historical timber framed wall under cyclic loads through an image-based tracking method
- Author
-
Sandak, Jakub, Riggio, Mariapaola, Ruggieri, Nicola, and Sandak, Anna
- Published
- 2019
- Full Text
- View/download PDF
11. Weathering resistance of thermally modified wood finished with coatings of diverse formulations
- Author
-
Herrera, René, Sandak, Jakub, Robles, Eduardo, Krystofiak, Tomasz, and Labidi, Jalel
- Published
- 2018
- Full Text
- View/download PDF
12. Manufacturing fit-for-purpose paper packaging containers with controlled biodegradation rate by optimizing addition of natural fillers
- Author
-
Sandak, Anna, Sandak, Jakub, and Modzelewska, Izabela
- Published
- 2019
- Full Text
- View/download PDF
13. Estimation of fracture toughness and shear yield stress of orthotropic materials in cutting with rotating tools
- Author
-
Orlowski, Kazimierz A., Ochrymiuk, Tomasz, Sandak, Jakub, and Sandak, Anna
- Published
- 2017
- Full Text
- View/download PDF
14. Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors
- Author
-
Han Lei, Kutnar Andreja, Sandak Jakub, Šušteršič Iztok, and Sandberg Dick
- Subjects
Trävetenskap ,Forestry ,Wood Science ,wood welding ,densified wood ,wood modification ,EWPs - Abstract
Engineered wood products (EWPs) are being increasingly used as construction materials. EWPs are currently being made using synthetic adhesives or metal fasteners, which lead to poor recyclability and reusability. Therefore, this review paper focused on emerging adhesive- and metal-free assembling techniques including wood dowels, rotary-dowel welding, wooden nails, and dovetail joining as alternative ways of making prefabricated EWPs. This will contribute towards green construction and optimising the building process to minimise its negative impact on the environment and its inhabitants, while maximising the positive aspects of the finished structure. The respective advantages and shortcomings will be compared with those of equivalent EWPs. In general, the dowel-laminated timber (DLT) provides sufficient load-bearing capacity and even better ductility than EWPs of equivalent size, but its relatively low stiffness under a bending load limits its application as a structural element. Optimised manufacturing parameters such as dowel species, dowel spacing, dowel diameter, dowel insertion angle, dowel shape, etc. could be studied to improve the stiffness. The improved mechanical properties and tight fitting due to set-recovery of densified wood support its use as sustainable alternatives to hardwood dowels in DLT to overcome problems such as the loosening of connections over time and dimensional instability. The rotary welding technology could also enhance the strength and long-term performance of dowel-type joints, but its poor water resistance needs further investigation. The main obstacles to implementing DLT products in the market are missing technical information and design guidelines based on national codes. Validerad;2023;Nivå 2;2023-02-13 (hanlid);Funder: Republic of Slovenia; Slovenian Research Agency ARRS (J4-3087); CT WOOD, Luleå University of Technology
- Published
- 2023
15. Near infrared spectroscopic studies on coatings of 19th century wooden parquets from manor houses in South-Eastern Poland
- Author
-
Sandak, Anna, Rozanska, Anna, Sandak, Jakub, and Riggio, Mariapaola
- Published
- 2015
- Full Text
- View/download PDF
16. Solid state NMR and IR characterization of wood polymer structure in relation to tree provenance
- Author
-
Santoni, Ilaria, Callone, Emanuela, Sandak, Anna, Sandak, Jakub, and Dirè, Sandra
- Published
- 2015
- Full Text
- View/download PDF
17. LightMeUp : back-print illumination paper display with multi-stable visuals
- Author
-
Campos Cuauhtli, Kljun Matjaž, Sandak Jakub, and Čopič Pucihar Klen
- Subjects
back-print illumination ,paper interfaces ,paper display ,paper augmentation ,interactive paper - Abstract
Despite the drive to digitise learning, paper still holds a prominent role within educational settings. While computational devices have several advantages over paper (e.g. changing and showing content based on user interaction and needs) their prolonged or incorrect usage can hinder educational achievements. In this paper, we combine the interactivity of computational devices with paper whilst reducing the usage of technology to the minimum. To this end, we developed and evaluated a novel back-print illumination paper display called LightMeUp where different information printed on the back side of the paper becomes visible when paper is placed on an interactive display and back-illuminated with a particular colour. To develop this novel display, we first built a display simulator that enables the simulation of various spectral characteristics of the elements used in the system (i.e. light sources such as tablet computers, paper types and printing inks). By using our simulator, we designed various use-case prototypes that demonstrate the capabilities and feasibility of the proposed system. With our simulator and use-cases presented, educators and educational content designers can easily design multi-stable interactive visuals by using readily available paper, printers and touch displays.
- Published
- 2022
18. Proposal of a new method for the rapid assessment of wood machinability and cutting tool performance in peripheral milling
- Author
-
Goli, Giacomo and Sandak, Jakub
- Published
- 2016
- Full Text
- View/download PDF
19. Adhesive-and Metal-Free Assembly Techniques for Prefabricated Multi-Layer Engineered Wood Products: A Review on Wooden Connectors.
- Author
-
Han, Lei, Kutnar, Andreja, Sandak, Jakub, Šušteršič, Iztok, and Sandberg, Dick
- Subjects
ENGINEERED wood ,CONSTRUCTION materials ,PRODUCT reviews ,WOOD products ,SUSTAINABLE construction ,WASTE recycling - Abstract
Engineered wood products (EWPs) are being increasingly used as construction materials. EWPs are currently being made using synthetic adhesives or metal fasteners, which lead to poor recyclability and reusability. Therefore, this review paper focused on emerging adhesive- and metal-free assembling techniques including wood dowels, rotary-dowel welding, wooden nails, and dovetail joining as alternative ways of making prefabricated EWPs. This will contribute towards green construction and optimising the building process to minimise its negative impact on the environment and its inhabitants, while maximising the positive aspects of the finished structure. The respective advantages and shortcomings will be compared with those of equivalent EWPs. In general, the dowel-laminated timber (DLT) provides sufficient load-bearing capacity and even better ductility than EWPs of equivalent size, but its relatively low stiffness under a bending load limits its application as a structural element. Optimised manufacturing parameters such as dowel species, dowel spacing, dowel diameter, dowel insertion angle, dowel shape, etc. could be studied to improve the stiffness. The improved mechanical properties and tight fitting due to set-recovery of densified wood support its use as sustainable alternatives to hardwood dowels in DLT to overcome problems such as the loosening of connections over time and dimensional instability. The rotary welding technology could also enhance the strength and long-term performance of dowel-type joints, but its poor water resistance needs further investigation. The main obstacles to implementing DLT products in the market are missing technical information and design guidelines based on national codes. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
20. Densified wooden nails for new timber assemblies and restoration works: a pilot research
- Author
-
Riggio, Mariapaola, Sandak, Jakub, and Sandak, Anna
- Subjects
Timber -- Research -- Methods ,Wood-carved figurines -- Methods -- Analysis ,Business ,Construction and materials industries - Abstract
ABSTRACT The use of wood-based connectors as a possible substitute of metal fasteners, for specific applications, in modestly loaded and moderately dense timber components, in new timber assemblies as well [...]
- Published
- 2016
- Full Text
- View/download PDF
21. Application of imaging techniques for detection of defects, damage and decay in timber structures on-site
- Author
-
Riggio, Mariapaola, Sandak, Jakub, and Franke, Steffen
- Subjects
Timberline -- Evaluation -- Forecasts and trends ,Ionizing radiation -- Methods ,Timber -- Methods ,Market trend/market analysis ,Business ,Construction and materials industries - Abstract
ABSTRACT The manuscript presents the application of NDT imaging techniques as complementary tools to be used during visual inspection. NDT imaging can be used to map inhomogeneity and to identify [...]
- Published
- 2015
- Full Text
- View/download PDF
22. Estimation of physical and mechanical properties of timber members in service by means of infrared spectroscopy
- Author
-
Sandak, Anna, Sandak, Jakub, and Riggio, Mariapaola
- Subjects
Building inspection -- Analysis -- Technology application ,Infrared spectroscopy -- Analysis -- Mechanical properties ,Timber -- Analysis -- Mechanical properties ,Technology application ,Business ,Construction and materials industries - Abstract
ABSTRACT On site characterization of wood members is a very challenging task, after consideration of all the variables affecting the material used for the construction and the complexity of the [...]
- Published
- 2015
- Full Text
- View/download PDF
23. Multivariate analysis of multi-sensor data for assessment of timber structures: principles and applications
- Author
-
Sandak, Jakub, Sandak, Anna, and Riggio, Mariapaola
- Subjects
Building inspection -- Technology application -- Equipment and supplies -- Methods ,Timber -- Inspection ,Technology application ,Business ,Construction and materials industries - Abstract
ABSTRACT The proper timber structure assessment is of great importance to assure safe service of buildings as well as to preserve cultural heritage objects for future generations. However, due to [...]
- Published
- 2015
- Full Text
- View/download PDF
24. What is superb wood surface? Defining user preferences and service life expectations
- Author
-
Sandak, Jakub, Riggio, Mariapaola, Sandak, Anna, and Santoni, Ilaria
- Subjects
Aesthetics -- Analysis ,Softwood -- Properties ,Renewable natural resources -- Usage ,Business ,Forest products industry - Abstract
ABSTRACT The superior properties and the natural beauty of wood make it a desired material for various applications including construction, interior/exterior design or other uses. Unfortunately, wood as any other [...]
- Published
- 2015
25. Analysis and prediction of selected mechanical/dynamic properties of wood after short and long-term waterlogging
- Author
-
Riggio, Mariapaola, Sandak, Jakub, Sandak, Anna, Pauliny, Dusan, and Babinski, Leszek
- Subjects
Wood -- Mechanical properties ,Soil moisture -- Mechanical properties ,Building materials -- Analysis -- Properties ,Business ,Construction and materials industries - Abstract
ABSTRACT Wood is one of the oldest building materials and, thanks to its favorable mechanical and technological properties, one of the most versatile. Due to its biological nature, wooden artefacts [...]
- Published
- 2014
- Full Text
- View/download PDF
26. Study of lignin-water molecular interactions using NIR spectroscopy: The effect of the drying process of the hardwood kraft lignin
- Author
-
Gordobil, Oihana, Herrera, René, Sandak, Jakub, and Sandak, Anna
- Subjects
NIRItalia online 2021 ,2DCOS ,hardwood kraft lignin ,hygroscopicity ,NIR spectroscopy ,DVS - Abstract
A conference abstract from NIRItalia online 2021 in English., Oihana Gordobil gratefully acknowledges receiving funding from the University of the Basque Country (post-doctoral grant DOCREC18/29). The authors gratefully acknowledge the European Commission for funding the InnoRenew project (grant agreement #739574) under the Horizon2020 Widespread-Teaming program and the Republic of Slovenia (investment funding of the Republic of Slovenia and the European Union's European Regional Development Fund).
- Published
- 2021
- Full Text
- View/download PDF
27. Off-line timber sorting with portable NIR spectrometer—feasibility study for glulam production
- Author
-
Sandak, Jakub, Niemz, Peter, and Sandak, Anna
- Subjects
NIRItalia online 2021 ,portable NIR ,off-line sorting ,glulam ,controllo qualità ,NIR portatile ,quality control ,smistamento off-line - Abstract
A conference abstract from NIRItalia online 2021 in English and Italian., The authors gratefully acknowledge the European Commission for funding the InnoRenew project (grant agreement #739574) under the Horizon2020 Widespread-Teaming program and the Republic of Slovenia (investment funding of the Republic of Slovenia and the European Union European Regional Development Fund). Authors acknowledge Neue Holzbau AG for providing samples for spectroscopic analysis.
- Published
- 2021
- Full Text
- View/download PDF
28. Stability of cellulose in water cluster—insight from density functional theory and infrared spectroscopy
- Author
-
Ponnuchamy, Veerapandian, Sandak, Anna, and Sandak, Jakub
- Subjects
NIRItalia online 2021 ,teoria del funzionale della densità ,moisture ,near infrared (NIR) ,cellulosa ,umidità ,hydrogen bonding ,legame a idrogeno ,vicino infrarosso (NIR) ,cellulose ,density functional theory - Abstract
A conference abstract from NIRItalia online 2021 in English and Italian., The authors gratefully acknowledge the European Commission for funding the InnoRenew project (grant agreement #739574) under the Horizon2020 Widespread-Teaming program and the Republic of Slovenia (investment funding of the Republic of Slovenia and the European Union European Regional Development Fund).
- Published
- 2021
- Full Text
- View/download PDF
29. Characterization of heritage objects with NIR hyperspectral imaging
- Author
-
Sandak, Jakub, Sandak, Anna, Legan, Lea, Retko, Klara, Kavčič, Maša, Kosel, Janez, Poohphajai, Faksawat, Herrera Diaz, Rene, Ponnuchamy, Veerapandian, Sajinčič, Nežka, Tavzes, Črtomir, and Ropret, Polona
- Subjects
NIRItalia online 2021 ,hyperspectral imaging ,patrimonio culturale ,painted beehive panels ,cultural heritage ,dipinti su pannelli di arnia ,immagini iperspettrali - Abstract
A conference abstract from NIRItalia online 2021 in English and Italian., The authors gratefully acknowledge the European Commission for funding the InnoRenew project (grant agreement #739574) under the Horizon2020 Widespread-Teaming program and the Republic of Slovenia (investment funding of the Republic of Slovenia and the European Union European Regional Development Fund). Authors acknowledge the Slovene Ethnographic Museum for providing painted beehive panels for spectroscopic analysis.
- Published
- 2021
- Full Text
- View/download PDF
30. Impact of drying process on kraft lignin
- Author
-
Gordobil, Oihana, Herrera, Rene, Poohphajai, Faksawat, Sandak, Jakub, Sandak, Anna, InnoRenew CoE, Department of Bioproducts and Biosystems, University of Primorska, Aalto-yliopisto, and Aalto University
- Subjects
Drying temperature ,2D-COS ,Hardwood kraft lignin ,NIR spectroscopy ,DVS - Abstract
Funding Information: The author gratefully acknowledges the European Commission for funding the InnoRenew project [Grant Agreement # 739574 ] under the Horizon 2020 Widespread-Teaming program, the Republic of Slovenia (investment funding from the Republic of Slovenia and the European Union European Regional Development Fund) and infrastructural ARRS program IO-0035. Part of this work was conducted during the project Multi-spec (BI-IT/18-20-007) funded by ARRS . Additionally, O.G. is grateful for the financial support received from the University of the Basque Country (post-doctoral grant of Ms. Gordobil DOCREC18/29) and R.H. acknowledges to the Department of Education of the Basque Government (post-doctoral grant). Publisher Copyright: © 2021 The Authors. Kraft lignin, an industrially available by-product from the pulp and paper industry, has revealed enormous potential to be valorised into a wide range of chemicals and biomaterials in the last two decades. However, the understanding of lignin chemistry remains challenging due to its chemical complexity. The goal of this work was to investigate the effect of drying temperature on the chemical, physical, and hygroscopic properties of hardwood kraft lignin isolated from industrial black liquor and elucidate the molecular interactions occurring between water and kraft lignin. Sorption-desorption isotherms determined by dynamic vapour sorption (DVS) technique revealed that the drying process considerably affected the hygroscopicity of the lignin polymer. Moreover, analytical pyrolysis (Py-GC-MS), dynamic NIR spectra collected as a function of relative humidity (0-95%) during sorption-desorption cycles and principal component analysis (PCA), evidenced chemical differences between lignin dried at room (25 °C) temperature and mild oven (55 °C) conditions. The main spectral changes associated with the water sorption in kraft lignin samples were analyzed using difference spectrum technique. 2D NIR spectral correlation analysis provided water sorption mechanism of lignin polymer, disclosing for the first time the sequential order in which water vapour molecules interact with active sorption sites in kraft lignin.
- Published
- 2021
31. The Hybrid Stylus: A Multi-Surface Active Stylus for Interacting with and Handwriting on Paper, Tabletop Display or Both.
- Author
-
Campos, Cuauhtli, Sandak, Jakub, Kljun, Matjaž, and Pucihar, Klen Čopič
- Subjects
- *
TABLET computers , *HANDWRITING , *USER experience , *TOUCH screens , *USER interfaces , *DIGITAL media - Abstract
The distinct properties and affordances of paper provide benefits that enabled paper to maintain an important role in the digital age. This is so much so, that some pen–paper interaction has been imitated in the digital world with touchscreens and stylus pens. Because digital medium also provides several advantages not available to physical paper, there is a clear benefit to merge the two mediums. Despite the plethora of concepts, prototypes and systems to digitise handwritten information on paper, these systems require specially prepared paper, complex setups and software, which can be used solely in combination with paper, and, most importantly, do not support the concurrent precise interaction with both mediums (paper and touchscreen) using one pen only. In this paper, we present the design, fabrication and evaluation of the Hybrid Stylus. The Hybrid Stylus is assembled with the infinity pencil tip (nib) made of graphite and a specially designed shielded tip holder that is attached to an active stylus. The stylus can be used for writing on a physical paper, while it still maintains all the features needed for tablet interaction. Moreover, the stylus also allows simultaneous digitisation of handwritten information on the paper when the paper is placed on the tablet screen. In order to evaluate the concept, we also add a user-friendly manual alignment of paper position on the underlying tablet computer The evaluation demonstrates that the system achieves almost perfect digitisation of strokes (98.6% of strokes were correctly registered with only 1.2% of ghost strokes) whilst maintaining excellent user experience of writing with a pencil on the paper. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
32. Timber Tracking in a Mountain Forest Supply Chain: A Case Study to Analyze Functionality, Bottlenecks, Risks, and Costs.
- Author
-
Pichler, Gerhard, Sandak, Jakub, Picchi, Gianni, Kastner, Maximilian, Graifenberg, Diego, Stampfer, Karl, and Kühmaier, Martin
- Subjects
WOODEN beams ,MOUNTAIN forests ,SUPPLY chains ,DIGITAL transformation ,TECHNOLOGICAL innovations ,RADIO frequency identification systems ,ELECTRONIC journals - Abstract
Digital transformation of the timber supply chain is more relevant at present than ever before. Timber tracking is one example of digital transformation, and can be performed in various locations, from the forest to the mill, or even beyond, to the final timber product. The integration of new technologies in the forestry and timber industries should contribute to enhancing supply chain efficiency and safety. For this purpose, a new timber tracking and processing system was tested by integrating RFID (Radio Frequency IDentification) technology with digital survey tools and intelligent machines, into a smart timber supply chain. A case study on this process was carried out in a mountain forest in Austria. The tags were used to link information to single items (trees and logs) and transfer relevant data (species, diameter, length, volume, defects, density, stiffness, branchiness, etc.), throughout the whole supply chain. The performance of the technology was analyzed by means of process flow, bottleneck, and risk analyses. Fourteen spruce trees went through the supply chain process from the forest stand to the log yard, monitored by the new timber tracking and processing system. The results revealed that the new system is useful for transferring information through the timber supply chain, and the system costs remained at a normal market level. The weakest point in the supply chain was the processing of the trees by the intelligent prototype processor. A high error rate and low durability lead to higher idling time and harvesting cost, but the findings of this study can be used to further improve this system. All other processes worked well and were at a marketable level. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
33. Comparative Performance of NIR-Hyperspectral Imaging Systems.
- Author
-
Ma, Te, Schimleck, Laurence, Dahlen, Joseph, Yoon, Seung-Chul, Inagaki, Tetsuya, Tsuchikawa, Satoru, Sandak, Anna, and Sandak, Jakub
- Subjects
NEAR infrared spectroscopy ,WOOD products ,HYPERSPECTRAL imaging systems ,INDIUM gallium arsenide ,MERCURY cadmium tellurides - Abstract
Near-infrared spectroscopy (NIRS) allows for the rapid estimation of a wide range of wood properties. Typically, NIRS studies on wood have utilized benchtop spectrometers, but efforts to utilize NIR hyperspectral imaging to examine wood and wood products have increased. Compared to benchtop NIR systems, hyperspectral imaging has several advantages (speed, visualization of spatial variability), but the data typically have a lower signal-to-noise ratio as well as fewer wavelengths saved; thus, hyperspectral imaging systems have a larger spectral sampling interval (SSI). Furthermore, the SSI and wavelength range varies considerably among different HSI cameras. NIR-HSI systems based on indium gallium arsenide (InGaAs) detectors have a wavelength range typically from 900 to 1700 nm, while short-wave infrared hyperspectral imaging (SWIR-HSI) systems based on mercury cadmium telluride (MCT) detectors have the 'full' NIR wavelength range from 1000 to 2500 nm. These factors may influence the performance of wood property calibrations. We compared one NIR-HSI (900–1700 nm) and three SWIR-HSI (1000–2500 nm) commercially available cameras with an NIRS benchtop spectrometer (1100–2500 nm). The performance of specific gravity (SG) and stiffness (MOE) calibration models was compared with one-hundred Douglas-fir (Pseudotsuga menziesii) samples. The limited wavelength range of an NIR-HSI camera provided the best models for MOE, whereas the NIR-HSI and two SWIR-HSI cameras provided similar SG results. SWIR-HSI models heavily favored wavelengths greater than 1900 nm. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
34. 9 - Trends and perspectives in the use of timber and derived products in building façades
- Author
-
Sandak, Anna, Brzezicki, Marcin, and Sandak, Jakub
- Published
- 2020
- Full Text
- View/download PDF
35. One-Step Lignin Refining Process: The Influence of the Solvent Nature on the Properties and Quality of Fractions.
- Author
-
Gordobil, Oihana, Diaz, René Herrera, Sandak, Jakub, and Sandak, Anna
- Subjects
LIGNANS ,LIGNIN structure ,LIGNINS ,OXIDANT status ,SULFATE pulping process ,SOLVENTS ,ORGANIC solvents ,THERMAL properties - Abstract
Heterogeneity of kraft lignin is one of the main limitations for the development of high-performance applications. Therefore, refining lignin using organic solvents is a promising strategy to obtain homogenous fractions with controlled quality in terms of structure and properties. In this work, one-step refining processes for hardwood kraft lignin using nine organic solvents of different chemical nature and polarity were carried out with the aim of investigating and understanding the effect of the type of organic solvent on the quality of resulting fractions. Structural features of both soluble and insoluble lignin fractions were assessed by GPC, Py-GC-MS, and FTIR linked to PCA analysis. Moreover, functional properties such as physical appearance, hygroscopicity, antioxidant capacity, and thermal properties were evaluated. The results evidenced the relationship between the nature and polarity of the solvents and the properties of the obtained soluble and insoluble fractions. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
36. Selected previous findings on the factors influencing the gluing quality of solid wood products in timber construction and possible developments: A review.
- Author
-
Hänsel, Andreas, Sandak, Jakub, Sandak, Anna, Mai, Juana, and Niemz, Peter
- Subjects
GLUE ,WOODEN building ,WOOD quality ,MANUFACTURING processes ,NEAR infrared spectroscopy ,GLULAM (Wood) ,WOOD products - Abstract
Various factors affect the bonding quality of elements used for timber construction. This review includes literature studies and personal experiences related to relevant technological variables defining glue bond performance in glue-laminated timber elements during their service life. The gluing of hardwood species receives special focus as it is considered by the industry to be the most challenging process for implementation. In particular, the effects of wood species, type of adhesive, glued-wood surface quality, physical and/or chemical modification of the wood, technological solutions for gluing, and varying climatic conditions during the use phase (relative humidity, temperature, air circulation, etc.) are considered. In addition, overlapping of individual influencing factors often leads to problems with bonding, thus requiring strongly integrating measurement methods (e.g. NIR spectroscopy). The causes of variations in the results when glued wood is tested using different standardized methods are discussed. A list of open research questions is provided, and problem solutions are recommended based on systematized cutting-edge knowledge. The aim of the work is to systematize the state of knowledge of wood gluing to create a basis for controlled and stable manufacturing processes. The progress of the work will be reported in further publications. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
37. NEGATIVE CARBON FOOTPRINT OF PACKAGING PAPER PRODUCTS, IS IT POSSIBLE?
- Author
-
Schau, M. Erwin, Sandak, Anna, Sandak, Jakub, and Gobakken, Lone Ross
- Subjects
cascading use ,paper products ,life cycle assessment (LCA) ,circular economy ,Product Environmental Footprint (PEF) ,wood ,carbon footprint - Abstract
Humanity has only 12 years to start a deep decline in emissions of Greenhouse gases in order to prevent dangerous, non-reversible climate change. Cascading use of wood might be a way to mitigate climate change. In this contribution, we investigate how the cascading use of wood from demolished buildings as a raw material for paper production could influence climate change impact) of packaging paper. We apply a well-defined allocation process from life cycle assessment (LCA) methods (i.e., cut-off based from EN 15804:2013) and also the circular footprint formula as established by the EU Environmental Footprint pilot phase (2013 – 2018). Three different scenarios are tested: 1) paper from pulp made of demolished wood, 2) paper made from paper and 3) paper from virgin pulp. This contribution demonstrates how the carbon footprint of packaging paper can be influenced by circular economy principles and, especially, how the cascading use of wood compares to other typical raw materials for packaging paper production.
- Published
- 2019
- Full Text
- View/download PDF
38. Wood protection techniques and natural weathering: their effect on aesthetics and preference of people
- Author
-
Lipovac, Dean, Burnard, Michael D., Sandak, Anna, and Sandak, Jakub
- Subjects
technology, industry, and agriculture ,wood protection, weathering, aesthetics, preference - Abstract
Wood treatments change the tactile and visual properties of wood substantially and they are further altered by weathering. No matter how useful the wood treatment is, people will be reluctant to select materials they do not find appealing. For this reason, many valuable wood protection techniques may find it hard to reach their full potential on the market. To confront this challenge, we must carefully analyse how the visual and tactile qualities of treated (and weathered) wood influence human preference and material selection. This presentation presents the results of a study in which 100 participants selected (and ranked) their favourite wooden materialsto be used as an outdoor table top surface based on their combined tactile and visual inspection. The results demonstrate how preference and selection of wood vary with treatment types, species, weathering, and sensory and evaluative properties.
- Published
- 2019
- Full Text
- View/download PDF
39. Description of models for prediction of long-term façades performance
- Author
-
Sandak, Anna and Sandak, Jakub
- Subjects
adaptive facades ,buildings - Abstract
The façades are important element of the building since are influencing its comfort, safety and aesthetics. The complexity of façades evolved over a time in order to accommodate wide range of functionalities. Martinez et al. (2015) listed several functions as relevant for façades: security, air and water infiltration mitigation, thermal and acoustical insulation, solar control, daylighting, glare control, the provision of views, and aesthetics. The current problems related to building façades performance are related to poor design of construction details, inadequate choice of materials, their wrong application and not proper maintenance (Flores-Colen et al. 2010). It is estimated that façades system require maintenance and partial renovation around 20-30 years after being build (Martinez et al. (2015). Modern design standards address nowadays the service life objectives and have been adopted into building codes and specifications. Designers are choosing the solutions that improve durability and reduce maintenance requirements. Materials suppliers are developing better performing products more resistant to deterioration processes. Owners are more aware of the importance of maintenance. Finally, contractors have developed quality control procedures to improve construction practices that are aiming to improve durability. However, the interaction between time and the elements that constitute the façade system, the interaction between the materials applied in the façade and the environmental exposure conditions, and the potential effects of changes in material’s service in the overall performance of the assembly is rarely taken into account (Fagerlund 1985). The intensity of degradation depends on exposure level, orientation/ position of assembly, architectonical details, location and related to it microclimate and material itself. Deterioration process is valid for all building materials, also those used for adaptive façades, since all materials require cleaning, maintenance and finally replacement. Consequently, even if many efforts are directed toward prediction of the building use phase, still reliable prediction of service life performance is problematic.
- Published
- 2018
- Full Text
- View/download PDF
40. Multiscale modelling investigation of wood modification with acetic anhydride.
- Author
-
Ponnuchamy, Veerapandian, Sandak, Anna, and Sandak, Jakub
- Abstract
Density functional theory (DFT) and molecular dynamics (MD) simulations were employed to investigate the interaction of cellulose and lignin with acetic anhydride for explaining the wood modification process. Cellulose was modelled with a cellobiose unit and dibenzodioxocin was used to represent the lignin model. Results obtained from both methods revealed that acetic anhydride interacted substantially more with the cellobiose model than the lignin model. The interaction energy of cellobiose–acetic anhydride was higher (about 20 kJ mol
−1 ) than that of lignin-acetic anhydride. DFT results on hydrogen bonding indicated that the hydroxyl group from cellobiose and the aromatic hydroxyl group from lignin models have similar energy values, which explain the equal strength of hydrogen bond interaction. The same trend was also obtained for the substitution of acetyl group in the hydroxyl group. MD results have also predicted that acetic anhydride forms a stronger interaction with cellobiose than with the lignin model, and these findings were in agreement with the DFT results. [ABSTRACT FROM AUTHOR]- Published
- 2020
- Full Text
- View/download PDF
41. On-Line Measurement of Wood Surface Smoothness.
- Author
-
Sandak, Jakub, Orlowski, Kazimierz A., Sandak, Anna, Chuchala, Daniel, and Taube, Piotr
- Abstract
Copyright of Wood Industry / Drvna Industrija is the property of Drvna Industrija and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2020
- Full Text
- View/download PDF
42. Development of Low-Cost Portable Spectrometers for Detection of Wood Defects.
- Author
-
Sandak, Jakub, Sandak, Anna, Zitek, Andreas, Hintestoisser, Barbara, and Picchi, Gianni
- Subjects
- *
SPECTROMETERS , *MOUNTAIN forests , *MICROELECTROMECHANICAL systems , *FORESTS & forestry , *WOOD stoves , *IR spectrometers - Abstract
Portable spectroscopic instruments are an interesting alternative for in-field and on-line measurements. However, the practical implementation of visible-near infrared (VIS-NIR) portable sensors in the forest sector is challenging due to operation in harsh environmental conditions and natural variability of wood itself. The objective of this work was to use spectroscopic methods as an alternative to visual grading of wood quality. Three portable spectrometers covering visible and near infrared range were used for the detection of selected naturally occurring wood defects, such as knots, decay, resin pockets and reaction wood. Measurements were performed on wooden discs collected during the harvesting process, without any conditioning or sample preparation. Two prototype instruments were developed by integrating commercially available micro-electro-mechanical systems with for-purpose selected lenses and light source. The prototype modules of spectrometers were driven by an Arduino controller. Data were transferred to the PC by USB serial port. Performance of all tested instruments was confronted by two discriminant methods. The best performing was the microNIR instrument, even though the performance of custom prototypes was also satisfactory. This work was an essential part of practical implementation of VIS-NIR spectroscopy for automatic grading of logs directly in the forest. Prototype low-cost spectrometers described here formed the basis for development of a prototype hyperspectral imaging solution tested during harvesting of trees within the frame of a practical demonstration in mountain forests. [ABSTRACT FROM AUTHOR]
- Published
- 2020
- Full Text
- View/download PDF
43. List of Contributors
- Author
-
Abdollahnejad, Z., Alabduljabbar, Hisham, Alyousef, Rayed, Ben Aicha, Mouhcine, Bhuvaneshwari, B., Bolívar, J.P., Brzezicki, Marcin, Chaudhary, Sandeep, Chen, Zihao, Contreras, M., Dalvand, A., Dawson, A.R., Dutta, Krishna, Eskander, Samir B., Gandomi, Amir H., Gázquez, M.J., Ghotbi Siabil, S.M. Amin, Giurich, Federico, Gupta, A., Gupta, Sanchit, Hadzima-Nyarko, Marijana, Han, Baoguo, Huang, Xu, Huseien, Ghasan Fahim, Illikainen, Mirja, Iyer, Nagesh R., Jaya, Ramadhansyah Putra, Kaewunruen, Sakdirat, Kamalakkannan, S., Kandalaft, Abdou George, Kathirvel, Parthiban, Kinnunen, Paivo, Liu, Chao, Luukkonen, Tero, Lv, Zhenyuan, Mahato, Kishore Kumar, Manjunath, R., Manzanal, Diego G., Martín, Christian M., Mastali, M., Mataei, Behrouz, Micelli, Francesco, Miličević, Ivana, Moghaddas Tafreshi, S.N., Mohammadhosseini, Hossein, Monfared, Vahid, Moro, Sandro, Narasimhan, Mattur C., Nejad, Fereidoon Moghadas, Nijgh, Martin, Pati, P.K., Perumal, Priyadharshini, Pique, Teresa M., Prasad, E.V., Rahim, F., Ranjbar, Sajad, Ray, Bankim Chandra, Renni, Angela, Romero, M., Sahu, S.K., Saleh, Hosam M., Sandak, Anna, Sandak, Jakub, Sattarifard, A., Selvakumar, S., Selvaraj, A., Shah, Kwok Wei, Soundara, B., Spinazzola, Florencia, Sreenivasan, Harisankar, Tahir, Mahmood Md., Veljkovic, Milan, Wang, Danna, Wei, Chuanwen, Xin, Haohui, Xiong, Teng, Zakeri, Hamzeh, Zhang, Henglong, Zhang, Wei, and Zhu, Chongzheng
- Published
- 2020
- Full Text
- View/download PDF
44. Quality control of vacuum thermally modified wood with near infrared spectroscopy
- Author
-
Sandak, Anna, Sandak, Jakub, and Allegretti, Ottaviano
- Published
- 2015
- Full Text
- View/download PDF
45. Prototype of the Near-Infrared Spectroscopy Expert System for Particleboard Identification.
- Author
-
Sandak, Anna, Sandak, Jakub, Janiszewska, Dominika, Hiziroglu, Salim, Petrillo, Marta, and Grossi, Paolo
- Subjects
NEAR infrared spectroscopy ,PROTOTYPES ,EXPERT systems ,PARTICLE board ,QUALITY control - Abstract
The overall goal of this work was to develop a prototype expert system assisting quality control and traceability of particleboard panels on the production floor. Four different types of particleboards manufactured at the laboratory scale and in industrial plants were evaluated. The material differed in terms of panel type, composition, and adhesive system. NIR spectroscopy was employed as a pioneer tool for the development of a two-level expert system suitable for classification and traceability of investigated samples. A portable, commercially available NIR spectrometer was used for nondestructive measurements of particleboard panels. Twenty-five batches of particleboards, each containing at least three independent replicas, was used for the original system development and assessment of its performance. Four alternative chemometric methods (PLS-DA, kNN, SIMCA, and SVM) were used for spectroscopic data classification. The models were developed for panel recognition at two levels differing in terms of their generality. In the first stage, four among twenty-four tested combinations resulted in 100% correct classification. Discrimination precision with PLS-DA and SVMC was high (>99%), even without any spectra preprocessing. SNV preprocessed spectra and SVMC algorithm were used at the second stage for panel batch classification. Panels manufactured by two producers were 100% correctly classified, industrial panels produced by different manufacturing plants were classified with 98.9% success, and the experimental panels manufactured in the laboratory were classified with 63.7% success. Implementation of NIR spectroscopy for wood-based product traceability and quality control may have a great impact due to the high versatility of the production and wide range of particleboards utilization. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
46. Machinability of Minor Wooden Species before and after Modification with Thermo-Vacuum Technology.
- Author
-
Sandak, Jakub, Goli, Giacomo, Cetera, Paola, Sandak, Anna, Cavalli, Alberto, and Todaro, Luigi
- Subjects
- *
WOOD , *CONSTRUCTION materials , *SURFACE roughness , *SURFACES (Technology) , *THREE-dimensional display systems - Abstract
The influence of the thermal modification process on wood machinability was investigated with four minor species of low economic importance. A set of representative experimental samples was machined to the form of disks with sharp and dull tools. The resulting surface quality was visually evaluated by a team of experts according to the American standard procedure ASTM D-1666-87. The objective quantification of the surface quality was also done by means of a three dimensions (3D) surface scanner for the whole range of grain orientations. Visual assessment and 3D surface analysis showed a good agreement in terms of conclusions. The best quality of the wood surface was obtained when machining thermally modified samples. The positive effect of the material modification was apparent when cutting deodar cedar, black pine and black poplar in unfavorable conditions (i.e., against the grain). The difference was much smaller for an easy-machinability specie such as Italian alder. The use of dull tools resulted in the worst surface quality. Thermal modification has shown a very positive effect when machining with dull tools, leading to a relevant increment of the final surface smoothness. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
47. Assessment of wood structural members degradation by means of infrared spectroscopy: an overview.
- Author
-
Sandak, Anna, Sandak, Jakub, and Riggio, Mariapaola
- Subjects
- *
INFRARED spectroscopy , *WEATHERING , *WATERLOGGING (Soils) , *TIMBER , *WOOD decay - Abstract
Timber structures can undergo alteration during their service life, which can be caused by mechanical, environmental or biological agents (bacteria, fungi and insects), because of the biological nature of the material. On site characterization of timber members is a very challenging task, especially assuming that both, the structure itself and material used for construction have to be evaluated. Current assessment procedures are limited to visual inspection, occasionally supported by a few instrumental analyses (such as wood moisture content measurement and drilling resistance tests). However, a clear tendency for the application of various non-destructive techniques is observed nowadays. The paper presents an overview on the current applications of infrared spectroscopy for the characterization of various alteration phenomena in wooden artefacts. A literature review is complemented by a series of results, reported from experimental campaigns carried out by the authors. The aim of the paper is to demonstrate the applicability of the proposed method for the analysis of different degradation processes occurring in timber members, with a special attention on wood aging, weathering, biotic decay by fungi and waterlogging. Examples of spectra evaluation as well as limitation of proposed methods are presented. Case studies including classification of decay type, analysis of the weathering dynamic and characterization of waterlogged wooden samples are briefly illustrated. Practical application of spectroscopy within timber structure assessment is considered as a very important supplement to the typical information collected during ordinary tests. Copyright © 2015 John Wiley & Sons, Ltd. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
48. Characterization and classification of Pinus oleoresin samples according to Pinus species, tapping method, and geographical origin based on chemical composition and chemometrics.
- Author
-
Rubini, Morandise, Clopeau, Armand, Sandak, Jakub, Dumarcay, Stephane, Sandak, Anna, Gerardin, Philippe, and Charrier, Bertrand
- Subjects
PINE ,FISHER discriminant analysis ,CHEMOMETRICS ,SPECIES ,MASS spectrometers - Abstract
Oleoresin samples collected directly from living-trees by three different tapping methods, and from four geographical origins were analyzed using two gas chromatography (GC) methods. The GC was coupled to a flame ionization detector (GC-FID) for quantification, and to a mass spectrometer (GC-MS) for identifying the chemical composition. Twenty-eight chemical components were detected and quantified. The proportions of each chemical component varied exceedingly between different samples, and other associated factors. The specific sample traits, including Pinus species, tapping method and geographical origin differentiated the sample batches. Notwithstanding, the main chemical components present in all the characterized samples are α-pinene and β-pinene. Statistical analysis demonstrated that the majority of molecules are of significant importance to sample traits. Moreover, the statistical analysis allows for the identification of the biomarkers associated with the sample traits. Additionally, Linear Discriminant Analysis models have shown very good performance in classifying samples based on the sample traits. Furthermore, the biomarkers allowing the establishment of differences between geographical origins are sativene, camphene, limonene, isopimaric acid and pimarinal, whereas the differentiation between tapping methods is established by sativene, pimaric acid, β-phellandrene, isopimaric acid, retinol and camphene, and lastly biomarkers allowing the differentiation between Pinus species are palustric acid, limonene, β-pinene and sativene. • Oleoresin samples collected from three Pinus species, three oleoresin tapping methods, and four geographical locations were analyzed using gas chromatography methods. • Statistical analyzes were used to create classification models according to the specific sample traits (Pinus species, tapping method and geographical origin). • Furthermore, characteristic biomarkers of the sample traits are highlighted. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
49. Characterization and Monitoring of Surface Weathering on Exposed Timber Structures With a Multi-Sensor Approach.
- Author
-
Riggio, Mariapaola, Sandak, Anna, and Sandak, Jakub
- Subjects
WOODEN building ,WEATHERING of buildings ,DATA fusion (Statistics) ,MULTISENSOR data fusion ,TIMBER - Abstract
The goal of this work was to understand and model the combined effect of time, geographical location, and exposure on the physical–chemical mechanisms of wood weathering in structures. Series of wooden samples were exposed to natural weathering in seven locations varying in climatic conditions, including Italy and north Germany. The set of samples was exposed for 4 years, collecting representative samples each year. Four exposure directions (north, south, east, and west) were investigated. Measurements of samples included: photogrammetry, near and mid infrared spectroscopy, color, gloss, roughness, and elemental composition (x-ray fluorescence spectroscopy). Results showed that the surface degradation mechanisms caused by weathering were affected by the site of exposure. The wood samples weathered in the Italian sites, in Udine and Macerata, were most degraded. The most significant changes were observed in samples exposed to the south direction. The original algorithm for calculation of “the weathering indicator”, by merging the multi-sensor data and linking these to the surface performance indicators was developed. Finally, the subjective visual assessment by the expert person was compared with parameters obtained by measuring the weathered surfaces with various sensors. A good correspondence between weathering indicator Windand subjective quality index was established. [ABSTRACT FROM PUBLISHER]
- Published
- 2015
- Full Text
- View/download PDF
50. Differences in wood properties of Picea abies L. Karst. in relation to site of provenance and population genetics.
- Author
-
Sandak, Jakub, Sandak, Anna, Cantini, Claudio, and Autino, Antonella
- Subjects
- *
NORWAY spruce , *WOOD chemistry , *TREE-rings , *POPULATION genetics , *PROVENANCE (Geology) , *MICROSATELLITE repeats in plants - Abstract
Chemical and physical characteristics of wood from six European populations of Picea abies were investigated taking into consideration their genetic differentiation determined by four microsatellites markers. The growth conditions of investigated spruce trees differed significantly. As a consequence, several adaptations were observed in samples from varying environments. The adaptation mechanisms include a variation to the annual rings morphology as well as the physical properties of the wood. It was proved that some properties, such as wood density or latewood ratio, are strictly correlated to the environmental variables. Results show that trees from geographically distinct populations present some diversity in the genotypes. It was also noticed that some trees did not share their genetic profile with other plants from the same location due to high intrapopulation variability. Samples from Finland possessed the lowest level of internal differentiation, while samples from northern Poland presented the lowest allele richness and were most divergent from the others. It was not possible to correlate any wood properties (chemical or physical) to genetic features of the population due to high intrapopulation diversity. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.