scholarly journals The risk of liquid wood degradation under the influence of marine factors

2019 ◽  
Vol 290 ◽  
pp. 12012
Author(s):  
Mihaela Luminita Barhalescu ◽  
Simona Ghita ◽  
Tudor-Cristian Petrescu

A case study was performed, concerning the behavior and degradation of a polymeric biocomposite material – “liquid wood”. This material is biodegradable and it is obtained from renewable resources. Three presentation forms – Arbofill Fichte, Arboform F45 and Arboblend V2, were subjected to the action of external factors present in a marine environment. The results pertaining to the change in the physico – chemical properties of “liquid wood” when subjected to the action of seawater and seawater microorganisms, with significant – but nevertheless positive – consequences upon the environment. The material exhibits good performance after the surface and mass stabilization – due to water, C, Na, Cl and O absorption. As such – due to the emergence of a protective organic biofilm – growth of microorganisms significantly decreases and electric conductivity increases. This case study may be viewed as a starting point for subsequent studies of “liquid wood”.

2016 ◽  
Vol 2 (2) ◽  
pp. 51-60 ◽  
Author(s):  
N. Nahar ◽  
M. A. H. Lanon ◽  
B. Saha ◽  
M. R. ​ Shaibur

2018 ◽  
Vol 181 (5) ◽  
pp. 768-776 ◽  
Author(s):  
Charles I. Nwankwo ◽  
Sebastian R. G. A. Blaser ◽  
Doris Vetterlein ◽  
Günter Neumann ◽  
Ludger Herrmann

2020 ◽  
Vol 267 ◽  
pp. 115338
Author(s):  
Vikas Goel ◽  
Sumit K. Mishra ◽  
Prabir Pal ◽  
Ajit Ahlawat ◽  
Narayanasamy Vijayan ◽  
...  

Author(s):  
Борис Магометович Хуболов

Приведён краткий обзор проблемы электрохромизма в неупорядоченных тонких пленках сложных оксидов вольфрама на основе экспериментальных результатов, опубликованных ранее. Рассмотрены проблемы ионно-электронного упорядочения в сложных оксидах вольфрама MWO ( M = Na, K и x = 0,3), их взаимосвязь с динамикой процесса электрохромного окрашивания в этих конденсированных системах. Рассмотрены возможные пути решения обозначенных проблем. Отправной точкой нашего похода к исследованию электрохромизма и разработки физических основ технологии электрохромных устройств явился отказ от общепринятого электрохимического рассмотрения этого явления. Мы убеждены в том, что электрохромный эффект является чисто твердотельным эффектом, происходящим в конденсированной системе с сильной электронной корреляцией. Электронная структура твердого тела, имеющаяся на границе раздела твердое тело-электролит в значительной степени, управляет характером и скоростью реакций, которые протекают на его поверхности. В случае окислов роль, которую играет электронная структура особенно сложна. Все изложенное указывает на необходимость рассмотрения влияния глубоких уровней в объеме оксидной вольфрамовой бронзы и на ее поверхности, граничащей с электролитом на процесс электрохромного окрашивания. A brief review of the problem of electrochromism in disordered thin films of complex tungsten oxides is given on the basis of experimental results published earlier. The problems of the ion-electron ordering in complex tungsten oxides MWO (M = Na or K and x = 0,3) are regarded as well as their relationship with the dynamics of the process of electrochromic coloring in these condensed systems. Possible ways of solving the indicated problems are considered. The starting point of our campaign to study the electrochromism and to develop the physical grounds of the technology of electrochromic devices was the rejection of the generally accepted electrochemical consideration of this phenomenon. We are convinced that the electrochromic effect is a purely solid-state one occurring in a condensed system with a strong electron correlation. The electronic structure of a solid at the solid-electrolyte interface largely controls the nature and rate of reactions that take place on its surface. In the case of oxides, the role played by the electronic structure is particularly complex. All of the above indicates the need to consider the effect of deep levels in the bulk of the oxide tungsten bronze and on its surface, bordering the electrolyte, on the process of electrochromic coloring.


2019 ◽  
Author(s):  
Tamer Farouk Ahmed El-Moghazy

The experiment was conducted in Sabahia Horticultural Research Station, Alexandria, Egypt during the period from February 2005 until July 2007. Spear and pepper mint fields were planted late February and harvested in June 2005. The oil from the herbs was extracted by steam distillation method in a private factory in 6-October city. Then, the storage experiment was started in the middle of July 2005 and extended for two years.Dark and clear glasses, 25 ml, were filled with the oils to study the effects of the presence vs. absence of oxygen in the bottle atmosphere (half full vs. full filled bottles), dry oil vs. moisted oil (1% moisture), darkness vs. light (dark vs. clear glasses) and the effect of room temperature vs. low temperature (4oC) on the oils quality during storage. Each treatment was represented by 3 bottles, used once only in each sampling every three months for 9 times lasted for 24 months, June 2007, including the starting point samples. Storing either spear mint volatile oil or pepper mint volatile oil dry, away of air, in dark and placed in a refrigerator is recommended to keep the oils quality in good status. The active compounds will be remained in the acceptable levels and retard it far from spoilage for longer time, it might reach 24 months.


2002 ◽  
Vol 7 (2) ◽  
pp. 29 ◽  
Author(s):  
M. Sauter ◽  
T. Licha

Shortchained alkylphenols (SCAP) represent a main constituent of crude oil and coal liquefaction products. Due to their specific oil/water partitioning behaviour and high aqueous solubility they can be detected in oil exploitation waters and groundwaters affected by various spills near oil pipelines, oil exploitation sites and coal liquefaction plants. New efficient and powerful analytical techniques have been developed that allow the identification of all 34 individual compounds (C0-C3) without derivatisation and in complex matrices. Due to the different physico-chemical properties of the SCAP, differential transport behaviour in groundwater can be observed, changing the relative concentrations of SCAP downgradient in space and time. These characteristic ratios can be employed to derive information on migration direction and the ageing of the source of contamination. A case study is presented to illustrate the use of this new tool. 


2014 ◽  
Vol 894 ◽  
pp. 275-279 ◽  
Author(s):  
Diyar I. Ahmed ◽  
S. Kasolang ◽  
M.A. Abu Bakar ◽  
Mohammad. H. Yousif

Bio-lubricants are often touted as a solution but the geographical necessities of cultivation can restrict their practicality as an absolute substitute to petroleum-based lubricants. The development of a novel environmentally-friendly bio-lubricant is the primary focus of this paper. The physico-chemical properties of the bio-lubricant were analyzed using multiple standards tribometers. This study provided sufficient data to conform an ISO VG 68 hydraulic industrial lubricant by blending 52.70 % (wt) soybean oil, 40.55 % (wt) mineral oil, and 6.75 (%) additive packages. This formulated blend as green alternative for machine lubrications will be significant in reducing perilous environmental pollution and depletion of natural resources. Moreover, it can contribute to reduce the global demand of petroleum based lubricant substantially.


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