scholarly journals Experimental Study on an Innovative Biopolymeric Treatment Against Salt Deterioration of Materials in Cultural Heritage

2021 ◽  
Vol 8 ◽  
Author(s):  
Mattia Bassi ◽  
Enrico Sassoni ◽  
Elisa Franzoni
Keyword(s):  
Saline Solution ◽  
Combined Treatment ◽  
Sodium Sulphate ◽  
The Other ◽  
Salt Crystallization ◽  
Capillary Absorption ◽  
Salt Damage ◽  
Chitosan Coating ◽  
Points Of View ◽  
Pre Treatment

Salt crystallization is one of the harshest deterioration mechanisms affecting heritage materials, causing impressive decay patterns and the loss of a high thickness of original materials. Although salt damage has been widely investigated in the literature from the theoretical and experimental points of view, the solutions to mitigate this problem are still extremely limited. In the present paper, a new biopolymeric treatment based on chitosan was tested on two kinds of porous limestones widely used in historic architecture, aiming at inhibiting the crystallization of sodium sulphate inside the stone and promoting the formation of salt efflorescence over the surface, rather than harmful subflorescence inside the pore network. The treatment was applied to the bare stone and also after an inorganic pre-treatment based on the formation of hydroxyapatite in the stone. Hydroxyapatite was recently proposed for the consolidation and protection of carbonate stones and here it is expected to provide an effective anchoring layer for the chitosan coating on the pores surface, and also to prevent the calcite washout from the stone and hence the removal of chitosan. The effect of hydroxyapatite alone was also tested, for comparison’s sake. Treated and untreated stone specimens were subjected to two different accelerated salt crystallization tests, one based on crystallization cycles (wetting-drying cycles) and the other one based on continuous capillary absorption of a saline solution (“wick effect”), evaluating the results in terms of weight loss, efflorescence formation, and changes in porosity and mechanical properties. The results showed that all the treatments are compatible with the stones, and the combined treatment (hydroxyapatite + chitosan) is extremely promising for the prevention of salt damage.

Sin is Dead, Long Live Sin!

2017 ◽  
Author(s):  
Kate Kirkpatrick
Keyword(s):  
Religious Commitment ◽  
The Other ◽  
Realist Approach ◽  
Points Of View ◽  
Cultural Amnesia

Chapter 9 offers two concluding ‘provocations’: one on wretchedness without God, the other on wretchedness with God. The first brings Sartre into dialogue with Marilyn McCord Adams’s work ‘God because of Evil’, arguing that Sartre’s account lends credence to her view that optimism is not warranted if one takes a robust realist approach to evil. Read as a phenomenologist of fallenness, Sartre may serve the apologetic purpose of making options ‘live’, in William James’s language; or, to use the phrase of Stephen Mulhall, to ‘hold open the possibility of taking religious points of view seriously’. The second provocation—on the question of wretchedness with God—suggests that Sartre can be read ‘for edification’ to help us see our failures in love. The book concludes that reading Sartre in this light can help redress ‘damaging cultural amnesia’ about religious commitment, offering an account of sin that cultivates humility, love, and mercy.

scholarly journals Measurement of δ18O and δ2H of water and ethanol in wine by Off-Axis Integrated Cavity Output Spectroscopy and Isotope Ratio Mass Spectrometry

2021 ◽  
Author(s):  
Xing Wang ◽  
Henk G. Jansen ◽  
Haico Duin ◽  
Harro A. J. Meijer
Keyword(s):  
Mass Spectrometry ◽  
Isotope Ratio ◽  
Isotope Analysis ◽  
Isotope Ratio Mass Spectrometry ◽  
Growth Conditions ◽  
The Other ◽  
H Nmr ◽  
Cavity Output ◽  
Pre Treatment ◽  
Output Laser

AbstractThere are two officially approved methods for stable isotope analysis for wine authentication. One describes δ18O measurements of the wine water using Isotope Ratio Mass Spectrometry (IRMS), and the other one uses Deuterium-Nuclear Magnetic Resonance (2H-NMR) to measure the deuterium of the wine ethanol. Recently, off-axis integrated cavity output (laser) spectroscopy (OA-ICOS) has become an easier alternative to quantify wine water isotopes, thanks to the spectral contaminant identifier (SCI). We utilized an OA-ICOS analyser with SCI to measure the δ18O and δ2H of water in 27 wine samples without any pre-treatment. The OA-ICOS results reveal a wealth of information about the growth conditions of the wines, which shows the advantages to extend the official δ18O wine water method by δ2H that is obtained easily from OA-ICOS. We also performed high-temperature pyrolysis and chromium reduction combined with IRMS measurements to illustrate the “whole wine” isotope ratios. The δ18O results of OA-ICOS and IRMS show non-significant differences, but the δ2H results of both methods differ much more. As the δ2H difference between these two methods is mainly caused by ethanol, we investigated the possibility to deduce deuterium of wine ethanol from this difference. The results present large uncertainties and deviate from the obtained 2H-NMR results. The deviation is caused by the other constituents in the wine, and the uncertainty is due to the limited precision of the SCI-based correction, which need to improve to obtain the 2H values of ethanol as alternative for the 2H-NMR method.

Combinatorial principles weaker than Ramsey's Theorem for pairs

2007 ◽  
Vol 72 (1) ◽  
pp. 171-206 ◽  
Author(s):  
Denis R. Hirschfeldt ◽  
Richard A. Shore
Keyword(s):  
Reverse Mathematics ◽  
The Other ◽  
Base System ◽  
Ramsey's Theorem ◽  
Open Questions ◽  
Ramsey’S Theorem ◽  
Combinatorial Principles ◽  
Points Of View ◽  
The One ◽  
Infinite Linear

AbstractWe investigate the complexity of various combinatorial theorems about linear and partial orders, from the points of view of computability theory and reverse mathematics. We focus in particular on the principles ADS (Ascending or Descending Sequence), which states that every infinite linear order has either an infinite descending sequence or an infinite ascending sequence, and CAC (Chain-AntiChain), which states that every infinite partial order has either an infinite chain or an infinite antichain. It is wellknown that Ramsey's Theorem for pairs () splits into a stable version () and a cohesive principle (COH). We show that the same is true of ADS and CAC, and that in their cases the stable versions are strictly weaker than the full ones (which is not known to be the case for and ). We also analyze the relationships between these principles and other systems and principles previously studied by reverse mathematics, such as WKL0, DNR, and BΣ2. We show, for instance, that WKL0 is incomparable with all of the systems we study. We also prove computability-theoretic and conservation results for them. Among these results are a strengthening of the fact, proved by Cholak, Jockusch, and Slaman, that COH is -conservative over the base system RCA0. We also prove that CAC does not imply DNR which, combined with a recent result of Hirschfeldt, Jockusch. Kjos-Hanssen, Lempp, and Slaman, shows that CAC does not imply (and so does not imply ). This answers a question of Cholak, Jockusch, and Slaman.Our proofs suggest that the essential distinction between ADS and CAC on the one hand and on the other is that the colorings needed for our analysis are in some way transitive. We formalize this intuition as the notions of transitive and semitransitive colorings and show that the existence of homogeneous sets for such colorings is equivalent to ADS and CAC, respectively. We finish with several open questions.

scholarly journals The Effect of Salt Solutions and Absorption Cycles in the Capillary and Drying Coefficient of Red Brick Samples with Different Joints

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
A. S. Guimarães ◽  
J. M. P. Q. Delgado ◽  
V. P. de Freitas ◽  
A. P. Albuquerque
Keyword(s):  
Molecular Diffusion ◽  
Research Work ◽  
Sodium Sulphate ◽  
Capillary Absorption ◽  
Material Decomposition ◽  
Salt Solutions ◽  
Partial Immersion ◽  
First Order Kinetics ◽  
Building Components ◽  
Best Fit

Rising damp can reduce building’s aesthetical value, comfort, and health mark when combined with the existence of soluble salts in the building components and in the ground water can even lead to material decomposition and compromise its structural performance. This research work intended to study the effect of different absorption cycles of two saturated solutions of sodium sulphate and potassium chloride in the capillary absorption curves obtained through the partial immersion of red brick samples without and with different joints. The results revealed significant differences in the capillary coefficients obtained when samples were tested with salt solutions. In the end of this paper an evaluation of the drying kinetics was presented for all the tested samples. Four different first-order kinetics models, available in the literature, were adjusted to describe the drying process and the results point that the Page and Logarithmic models allow the best fit. The apparent molecular diffusion coefficient for solid red brick samples saturated with different solutions and joints was also estimated.

Observations of blanket characteristics in full-scale floc blanket clarifiers

2003 ◽  
Vol 47 (1) ◽  
pp. 197-204 ◽  
Author(s):  
L.C. Chen ◽  
S.S. Sung ◽  
W.W. Lin ◽  
D.J. Lee ◽  
C. Huang ◽  
...  
Keyword(s):  
Treatment Process ◽  
Combined Treatment ◽  
The Other ◽  
Raw Water ◽  
Water Turbidity ◽  
Capillary Suction ◽  
Zeta Potentials ◽  
High Turbidity ◽  
Water Supply Company ◽  
Clarified Water

We monitored the changes in concentrations, zeta potentials, sizes and capillary suction times of the solids flocs in the clarified water from eight floc blanket clarifiers of PingTsan Water Works of Taiwan Water Supply Company with low (<10 NTU) and high (>100 NTU) turbidity raw water. For the former, one-stage coagulation-sedimentation treatment was adopted which yielded a rather unstable blanket. Complete washout was noticeable when the PACl dosage was insufficient. On the treatment of high-turbidity raw water, on the other hand, the Works adopted the combined treatment process, that is, the raw water was first coagulated and settled in a pre-sedimentation tank, afterwards, its effluent was coagulated again and clarified in the clarifiers. The resulting flocs could form a networked blanket that was relatively stable to the shock load in raw water turbidity.

Removal of Heavy Metals from Industrial Effluent by Crossflow Microfiltration

1992 ◽  
Vol 25 (10) ◽  
pp. 55-67 ◽  
Author(s):  
R. C. Squires
Keyword(s):  
Heavy Metals ◽  
Pilot Trial ◽  
Industrial Effluent ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Sodium Sulphate ◽  
The Other ◽  
Operating Costs ◽  
Treated Effluent ◽  
Crossflow Microfiltration

The performance of Exxflow, a patented form of crossflow microfiltration, treating industrial wastewaters containing mixed heavy metals discharged by two types of industry is quantified and compared with the traditional technologies used for such treatment. Pilot trial results using Exxflow are shown and compared to the performance of the full scale plants now operating on these effluents. The operating costs of the Exxflow process are estimated for the two plants. One of which has been operating for 18 months and the other about 4 months. The Exxflow process is described and improvements which are being developed to lower the operating costs are presented. It is shown that industrial effluents containing mixed heavy metals are very effectively treated by the Exxflow process and since the installation of the plants the treated effluent has been of a quality suitable for discharge to the River Thames in one case and to a sewage treatment plant in the other. Unlike other processes, Exxflow has shown that it can successfully treat effluent containing mixed metals and that removal of antimony from mixed metal waste waters is affected by the concentration of sodium sulphate in the wastewater.

scholarly journals Comparison of Conventional and Novel Pre-treatment Methods for Bioethanol Production from Fruit and Vegetable Wastes

2020 ◽  
Vol 33 (4) ◽  
pp. 471-483
Author(s):  
Tugba Keskin
Keyword(s):  
Saccharomyces Cerevisiae ◽  
The Other ◽  
Yeast Fermentation ◽  
Bioethanol Production ◽  
Fruit And Vegetable ◽  
Bacterial Fermentation ◽  
Waste Gas ◽  
Clostridium Ljungdahlii ◽  
Vegetable Wastes ◽  
Pre Treatment

In this study, novel and conventional techniques for the production of bioethanol from fruit and vegetable wastes (FVWs) by yeast and bacterial fermentation were investigated experimentally. Different pretreatment techniques (acid, heat, acid/heat, and microwave) for yeast fermentation were compared. Maximum ethanol concentrations of 11.7 and 11.8 g L–1 were observed from acid/heat and microwave pretreatment, respectively, by using Saccharomyces cerevisiae. On the other hand, biochar production from FVWs and syngas fermentation from the waste gas of this process were integrated. From waste gas with 12 % CO content, 5.5 g L–1 and 2.5 g L–1 ethanol production was observed by using anaerobic mixed culture and Clostridium ljungdahlii, respectively. The overall results emphasize the potential of bioethanol production from FVWs by economically feasible and environmentally friendly methods.

scholarly journals To Publish, Make Known and Sell or Promoting Printed Books in the Incunabula Period

2021 ◽  
Vol 15 (3) ◽  
pp. 331-356
Author(s):  
Lucia Lichnerová
Keyword(s):  
Geographical Area ◽  
The Other ◽  
Book Production ◽  
Book Market ◽  
Design Elements ◽  
15Th Century ◽  
Other Hand ◽  
Printed Books ◽  
Points Of View ◽  
The One

The study To Publish, Make Known and Sell is based on verified existence of competition tensions between the 15th century typographers/publishers, related to the absence of functional regulatory tools of book production of the incunabula period. The increase in the number of book-printers within the relatively narrow geographical area, disregard of publishers’ privileges, the emergence of pirated reprints, as well as insufficient self-promotion on the book market through introducing novelties had concentrated typographers’ attention on devising new tools of securing their triumph in publisher’s competition – the so called book advertisements. The author has analysed 44 promotional posters of the incunabula period from several points of view and attempted to identify their design elements, which on the one hand showed signs of certain standardization, while on the other hand they were subject to personal creativity of their creator. She gives detailed overview of the circumstances of the origin, typographic design and contents of book advertisements of several kinds within the context of promoting either the existing or planned editions, of one edition or a group of books; specifically focusing on the unique types of advertising. In conclusion, the author cites the circumstances of the extinction of book advertisements related to the rise of the new promotional tool – booksellers’ catalogue and submits a bibliography of the book advertisements dating from the 15th century.

scholarly journals To write or not to write: censorship in "The Woman in the Photo" by Tia Șerbănescu and "A Censor’s Notebook" by Liliana Corobca

2018 ◽  
Vol 1 (1) ◽  
pp. 8-27
Author(s):  
Monica Manolachi
Keyword(s):  
The Other ◽  
Literary Texts ◽  
Psychological Process ◽  
Production Of Knowledge ◽  
Mise En Abyme ◽  
Points Of View ◽  
The One ◽  
The Mind ◽  
The Relationship ◽  
Compare And Contrast

Censorship as a literary subject has sometimes been necessary in times of change, as it may show how the flaws in power relations influence, sometimes very dramatically, the access to and the production of knowledge. The Woman in the Photo: a Diary, 1987-1989 by Tia Șerbănescu and A Censor’s Notebook by Liliana Corobca are two books that deal with the issue of censorship in the 1980s (the former) and the 1970s (the latter). Both writers tackle the problem from inside the ruling system, aiming at authenticity in different ways. On the one hand, instead of writing a novel, Tia Șerbănescu kept a diary in which she contemplated the oppression and the corruption of the time and their consequences on the freedom of thought, of expression and of speech. She thoroughly described what she felt and thought about her relatives, friends and other people she met, about books and their authors, in a time when keeping a diary was hard and often perilous. On the other hand, using the technique of the mise en abyme, Liliana Corobca begins from a fictitious exchange of emails to eventually enter and explore the mind of a censor and reveal what she thought and felt about the system, her co-workers, her boss, the books she proofread, their authors and her own identity. Detailed examinations and performances of the relationship between writing and censorship, the two novels provide engaging, often tragi-comical, insights into the psychological process of producing literary texts. The intention of this article is to compare and contrast the two author’s perspectives on the act of writing and some of its functions from four points of view: literary, cultural, social and political.

scholarly journals Managing relationships through repetition

Pragmatics ◽  
2019 ◽  
Vol 29 (1) ◽  
pp. 57-82
Author(s):  
Saeko Machi
Keyword(s):  
Significant Role ◽  
The Other ◽  
Japanese Language ◽  
Talk Show ◽  
The Third ◽  
Short Period ◽  
Points Of View ◽  
Tv Talk Show ◽  
Dynamic Relationships

Abstract This study examines cross-speaker repetition in triadic conversations in the Japanese language. For the analysis, three sets of triadic conversations between close friends taken from a TV talk show are used. The results reveal that repetition in triadic conversations performs distinctive functions that are not observed in dyadic conversations: repetition often takes place between only two participants of the triad and allows the two to team up and strengthen their bond exclusively (teaming repetition), or even playfully tease the third participant (teasing repetition). Repetition is also shared between the three participants. In such cases, it allows the participants to create an instant bond by joking or referring to shared circumstances (immediate threefold repetition), or to gradually establish rapport by connecting their utterances and co-constructing a story (repetition relay). All these types of repetition express the participants’ points of view and contribute efficiently to their relationships that shift from moment to moment. The study further demonstrates cases in which one participant makes good use of various repetition types in a short period of time and efficiently allocates thoughts and feelings to the other two participants. The study concludes that repetition plays a significant role in Japanese conversation, helping speakers to converse smoothly and manage the dynamic relationships efficiently.

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