scholarly journals Methodology for Efficient Bitumen Storage with Reduced Energy Consumption

2021 ◽  
Vol 11 (19) ◽  
pp. 9319
Author(s):  
Amina Tahri ◽  
Mohsine Bouya ◽  
Mokhtar Ghazouani ◽  
Ouafae Achak ◽  
Tarik Chafik
Keyword(s):  
Energy Consumption ◽  
Room Temperature ◽  
Storage Conditions ◽  
Temperature Conditions ◽  
Needle Penetration ◽  
Energy Needs ◽  
Energy Aspect ◽  
Oxidative Behavior ◽  
Storage Processes

This paper studies the possibility of minimizing energy consumption during 35/50 bitumen storage. Similarly to most bitumen companies, the company with which we collaborated uses fossil fuel to maintain bitumen tanks at 150 °C. The main objective is to optimize energy usage. To achieve this purpose, we tested two new storage processes. One is based on dynamic temperature storage between 140 and 160 °C, and the other on room temperature conditions. This work evaluates the effect of these storage conditions on the quality of 35/50 bitumen, and studies the energy aspect to calculate the energy profit for every storage method. After storage, we have studied short-term and long-term ageing using the Rolling Thin Film Oven (RTFOT) and the Pressure Ageing Vessel (PAV) tests, respectively. We characterized the samples using needle penetration at 25 °C, the softening point, and Attenuated Total Reflectance-Fourier Transform Infrared (ATR-FTIR) spectroscopy. We observed that the change in physical properties is negligible after the tested storage processes. Chemically, both the storage conditions affected the oxidative behavior acceptably; the carbonyl index was the same in the long term. We conclude that we can store 35/50 bitumen at room temperature conditions, which follow us to save more than three times the energy needs compared to the standard configurations.

Ionically Self-Assembled Monolayer pH Sensitive Films-Fabrication and their Long Term Response to Varying Temperature Conditions

2021 ◽  
Vol 878 ◽  
pp. 15-22
Author(s):  
Brianna A. Richmond ◽  
Carisa D. Kunkle ◽  
Daniela M. Topasna
Keyword(s):  
Room Temperature ◽  
Ph Responsive ◽  
Self Assembled Monolayer ◽  
Percent Change ◽  
Temperature Conditions ◽  
Glass Slides ◽  
Long Time ◽  
Self Assembled ◽  
Term Response

This study presents the long time effects of varying temperature conditions on pH-responsive films deposited on glass slides. The films were fabricated from Brilliant Yellow and poly (allylamine hydrochloride) through ionically self-assembled monolayer technique using an automated slide strainer. The absorbance of the films was monitored and the effect of varying temperature on the optical properties of the films was studied. We found that as the films are maintained at increasing temperatures their absorbance slightly decreased. As the temperature increased the percent change decreased reaching a plateau. Films kept at low temperatures of 3.24 °C and below freezing (-9.02 °C) had a small increase in absorbance. Finally, we monitored the absorbance of films kept at room temperature over a long time (128 days) and found that the films showed decreased absorbance by 19%.

scholarly journals Physical Stability and Viscoelastic Properties of Co-Amorphous Ezetimibe/Simvastatin System

2019 ◽  
Vol 12 (1) ◽  
pp. 40 ◽  
Author(s):  
Justyna Knapik-Kowalczuk ◽  
Krzysztof Chmiel ◽  
Karolina Jurkiewicz ◽  
Natália Correia ◽  
Wiesław Sawicki ◽  
...  
Keyword(s):  
Elevated Temperature ◽  
Viscoelastic Properties ◽  
Room Temperature ◽  
Physical Stability ◽  
Ternary Systems ◽  
Storage Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
Temperature Conditions ◽  
First Time

The purpose of this paper is to examine the physical stability as well as viscoelastic properties of the binary amorphous ezetimibe–simvastatin system. According to our knowledge, this is the first time that such an amorphous composition is prepared and investigated. The tendency toward re-crystallization of the amorphous ezetimibe–simvastatin system, at both standard storage and elevated temperature conditions, have been studied by means of X-ray diffraction (XRD). Our investigations have revealed that simvastatin remarkably improves the physical stability of ezetimibe, despite the fact that it works as a plasticizer. Pure amorphous ezetimibe, when stored at room temperature, begins to re-crystallize after 14 days after amorphization. On the other hand, the ezetimibe-simvastatin binary mixture (at the same storage conditions) is physically stable for at least 1 year. However, the devitrification of the binary amorphous composition was observed at elevated temperature conditions (T = 373 K). Therefore, we used a third compound to hinder the re-crystallization. Finally, both the physical stability as well as viscoelastic properties of the ternary systems containing different concentrations of the latter component have been thoroughly investigated.

scholarly journals En sur udfordring. Om surt papir i bibliotekets samlinger

2014 ◽  
Vol 49 ◽  
Author(s):  
Birgit Vinther Hansen
Keyword(s):  
Room Temperature ◽  
Storage Conditions ◽  
Point Of View ◽  
Western World ◽  
Air Humidity ◽  
Paper Machines ◽  
Set Up ◽  
National Significance ◽  
Short Time

NB: Artiklen er på dansk, kun resuméet er på engelsk. New materials were adopted during the industrialisation of paper production in the early 1800s. Experiments were done with straw and wood as fibre sources and acidic alum was commonly used as a sizing agent for all paper qualities produced by the paper machines. This, along with stiff competition among paper manufacturers, resulted in a drastic decrease in the quality of all types of paper and the production of vast quantities of acidic paper that could last only a relatively short time. Many of the Royal Library’s collections consist of acidic, short-fibre paper from around 1830 up to the middle of the 1980s when, finally, increased production of neutral-sized, long-like paper became possible. Acidic paper breaks down under ordinary storage conditions of room temperature and a certain degree of air humidity. Librarians and archivists throughout the Western world face a major challenge in the preservation of this relatively unstable material. To meet this challenge, various mass deacidification processes have been developed that, by deacidifying the paper, extend its lifetime three to four times. On the basis of a national report on the preservation of Danish cultural heritage, a committee was set up in 2004 to examine more closely the extent of acidic paper in the collections and whether mass deacidification of the country’s collections of unique national significance could be recommended. The committee had various sample tests done, including of the Royal Library’s collections. It was found that 70% of the Library’s collections date from 1800 to 1985 and that 93% of the objects concerned are more or less acidic. On the basis of the sample tests, it was possible to establish a rough prognosis as to how long the Library’s collections would be able to withstand ordinary physical handling, given that the paper, over time, will inevitably become so brittle that it disintegrates with use. If the collections are preserved in a climate, as was historically the case, at room temperature and varying humidity throughout the year, then half of the collections will have severely deteriorated in a hundred years. In order to ensure a longer lifetime, the collections can either be mass deacidified or the temperature and air humidity can be reduced so as to inhibit the breakdown processes. The committee and the Royal Library chose to work to ensure the collections’ long-term life by focusing on cool, dry storerooms, since this solution is, both from the financial point of view and with respect to preservation ethics, the most competitive. Lowering the temperature and the air humidity also makes it possible to extend the collections’ lifetime far more than with deacidification alone.

scholarly journals Changes of salivary biomarkers under different storage conditions: effects of temperature and length of storage

2018 ◽  
Vol 29 (1) ◽  
pp. 94-111 ◽  
Author(s):  
Tomás Barranco ◽  
Asta Tvarijonaviciute ◽  
Damián Escribano ◽  
Fernando Tecles ◽  
José J Cerón ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Room Temperature ◽  
Storage Conditions ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Long Term Storage ◽  
Reducing Ability ◽  
Trolox Equivalent ◽  
The Stability ◽  
Term Storage

Introduction: In this report, we aimed to examine the stability of various analytes in saliva under different storage conditions. Materials and methods: Alpha-amylase (AMY), cholinesterase (CHE), lipase (Lip), total esterase (TEA), creatine kinase (CK), aspartate aminotransferase (AST), lactate dehydrogenase (LD), lactate (Lact), adenosine deaminase (ADA), Trolox equivalent antioxidant capacity (TEAC), ferric reducing ability (FRAS), cupric reducing antioxidant capacity (CUPRAC), uric acid (UA), catalase (CAT), advanced oxidation protein products (AOPP) and hydrogen peroxide (H2O2) were colorimetrically measured in saliva obtained by passive drool from 12 healthy voluntary donors at baseline and after 3, 6, 24, 72 hours, 7 and 14 days at room temperature (RT) and 4 ºC, and after 14 days, 1, 3 and 6 months at – 20 ºC and – 80 ºC. Results: At RT, changes appeared at 6 hours for TEA and H2O2; 24 hours for Lip, CK, ADA and CUPRAC; and 72 hours for LD, Lact, FRAS, UA and AOPP. At 4 ºC changes were observed after 6 hours for TEA and H2O2; 24 hours for Lip and CUPRAC; 72 hours for CK; and 7 days for LD, FRAS and UA. At – 20 ºC changes appeared after 14 days for AST, Lip, CK and LD; and 3 months for TEA and H2O2. At – 80 ºC observed changes were after 3 months for TEA and H2O2. Conclusions: In short-term storage, the analytes were more stable at 4 ºC than at room temperature, whereas in long-term storage they were more stable at - 80 ºC than at – 20 ºC.

Comparative Analysis of Natural and Stimulated Room Temperature of Residential Buildings in Hot Summer and Cold Winter Zone

2011 ◽  
Vol 71-78 ◽  
pp. 547-551
Author(s):  
Yong Fei Ning ◽  
Ze Hua Liu ◽  
Gang Chen ◽  
Jie Zhang
Keyword(s):  
Energy Consumption ◽  
Comparative Analysis ◽  
Room Temperature ◽  
Residential Buildings ◽  
Residential Building ◽  
Cold Winter

Based on long-term testing and recording of room temperate in a bedroom of residential buildings in the hot summer and cold winter zone, this assay focuses on comparative analysis of tested results and simulated results derived from the DeST software. It verifies the rationality and reliability of the DeST software, showing the feasibility that software DeST can be applied to analyze the energy consumption of residential building in hot summer and cold winter zone.

Efficacy of the Antigenicity-Retaining Ability of Fixative Solutions for Liquid-Based Cytology: Immunocytochemistry of Long-Term Storage

2021 ◽  
pp. 1-12
Author(s):  
Hiaki Sato ◽  
Yoshiaki Norimatsu ◽  
Satoshi Irino ◽  
Takeshi Nishikawa
Keyword(s):  
Cell Membrane ◽  
Room Temperature ◽  
Storage Temperature ◽  
Storage Period ◽  
Storage Conditions ◽  
Immunocytochemical Staining ◽  
Long Term Storage ◽  
Liquid Based Cytology ◽  
Term Storage

<b><i>Introduction/Objective:</i></b> Liquid-based cytology (LBC) is advantageous as multiple stained specimens can be prepared and used for additional assays such as immunocytochemical and molecular-pathological investigations. Two types of preservative-fixative solutions (fixatives) are used for nongynecologic specimens used in the BD SurePath-LBC (SP-LBC) method, and their components vary. However, few studies have evaluated the differences in antigen-retaining ability between these fixatives. Therefore, we investigated and compared the antigen-retaining ability of the fixatives in immunocytochemical staining (ICC) under long-term storage conditions. <b><i>Materials and Methods:</i></b> Sediments of cultured RAJI cells (derived from Burkitt’s lymphoma) were added to each fixative (red and blue) and stored at room temperature for a specified period (1 h; 1 week; and 1, 3, and 6 months). The specimens were then prepared using the SP-LBC method and subjected to ICC. Positivity rate was calculated using the specimens fixed at room temperature for 1 h as a control. Antibodies against Ki67 expressed in the nucleus and against CD20 and leukocyte common antigen (LCA) expressed on the cell membrane were used. <b><i>Results:</i></b> For CD20 and LCA, the positivity rate increased with time in the red fixative compared with that in the control. In the blue fixative, the positivity rate was highest at 1 h and was maintained at a high level throughout the storage period. In contrast, the Ki67 positivity rate was highest at 1 h in both red and blue fixatives and markedly decreased with time. Therefore, although refrigerated (8°C) storage was used, no improvement was noted. <b><i>Conclusions:</i></b> Long-term storage is possible for cell membrane antigens at room temperature; however, it is unsuitable for intranuclear antigens. Therefore, we conclude that suitable fixative type and storage temperature differ based on antigen location. Further investigation is warranted.

The Effect of Storage Temperature and Physical State on the Performance of Antisera in Radioimmunoassay after Long-Term Storage

1988 ◽  
Vol 25 (1) ◽  
pp. 89-95
Author(s):  
B A Middleton ◽  
L M Morgan ◽  
G W Aherne ◽  
V Marks
Keyword(s):  
Room Temperature ◽  
Storage Temperature ◽  
Storage Conditions ◽  
Liquid Form ◽  
Long Term Storage ◽  
Freeze Dried ◽  
Control Serum ◽  
Term Storage ◽  
Temperature Storage

The performance in radioimmunoassay of four antisera after storage at temperatures ranging from −40°C to room temperature, in three physical states (frozen, liquid or freeze dried) was investigated over a 3-year period. No deterioration in antiserum performance in terms of precision and accuracy of quality control serum measurement or recovery of ligand was apparent under any of the storage conditions studied. Some lowering of titre became apparent in two of the antisera over the study period. Deterioration was most marked when antiserum was stored lyophilised at room temperature. Storage of antiserum frozen confers no advantage over storage at 4°C provided precautions are taken to minimise bacterial contamination when storing antiserum in liquid form.

An improved granular formulation for a mycoherbicidal strain ofFusarium oxysporum

Weed Science ◽  
1999 ◽  
Vol 47 (4) ◽  
pp. 473-478 ◽  
Author(s):  
K. P. Hebbar ◽  
B. A. Bailey ◽  
S. M. Poch ◽  
J. A. Lewis ◽  
R. D. Lumsden
Keyword(s):  
Shelf Life ◽  
Room Temperature ◽  
Rice Flour ◽  
Storage Conditions ◽  
Vascular Wilt ◽  
Term Survival ◽  
Chlamydospore Formation ◽  
Oil Formulation ◽  
Higher Temperature

Modifications were investigated to improve shelf-life or long-term survival upon storage of an extrudedOryza sativaL. (rice) flour : gluten : clay: oil formulation (C7) of a mycoherbicide,Fusarium oxysporumSchlechtend: Fr. f. sp.erythroxylistrain EN4, that causes vascular wilt inErythroxylum cocavar.coca(coca). Fermentor-produced biomass, which contained abundant desiccation-resistant chlamydospores, was incorporated into various adaptations of C7 and stored at room temperature (22 to 25 C) under moderately high (50 to 60%) and low (0 to 5%) relative humidities (RHs). The effect of RH on shelf-life was not significant up to 4 mo of storage, while the presence of oil, added to improve its extrusion, reduced viability significantly. Addition ofGossypium hirsutumL. (cotton) embryo flour or complete elimination of oil from the formulation improved shelf-life from 3 mo to > 12 mo. Shelf-life was further improved by removing the binding agent gluten in the formulation and replacing it with autoclavedO. sativaflour. Ability of the formulations to produce secondary propagules, tested on 1% water agar, indicated that, while adding oil had no effect,G. hirsutumembryo flour increased desiccation-resistant chlamydospore counts but lowered macroconidial counts. Autoclaved rice flour (MR) significantly improved both macroconidial and microconidial counts without affecting chlamydospore counts. None of the formulations affected the total viable propagule counts. When compared with the original formulation (C7), the modification (MRRP7), with MR,G. hirsutumembryo flour, and without oil, was found to have improved shelf-life at higher temperature and RHs and enhanced potential for secondary chlamydospore formation. These characteristics are important for survival of the formulatedF. oxysporumunder less expensive storage conditions and, once applied, for survival in the soil.

Human plasma stability during handling and storage: impact on NMR metabolomics

The Analyst ◽  
2014 ◽  
Vol 139 (5) ◽  
pp. 1168-1177 ◽  
Author(s):  
Joana Pinto ◽  
M. Rosário M. Domingues ◽  
Eulália Galhano ◽  
Cristina Pita ◽  
Maria do Céu Almeida ◽  
...  
Keyword(s):  
Human Plasma ◽  
Room Temperature ◽  
Storage Conditions ◽  
Plasma Composition ◽  
Long Term Storage ◽  
Short And Long Term ◽  
The Stability ◽  
And Storage ◽  
Term Storage

The stability of human plasma composition was investigated by NMR, considering different collection tubes, time at room temperature (RT), short- and long-term storage conditions and up to 5 consecutive freeze–thaw cycles.

Comparative Labelling and Biokinetic Studies of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn)

1977 ◽  
Vol 16 (01) ◽  
pp. 30-35 ◽  
Author(s):  
N. Agha ◽  
R. B. R. Persson
Keyword(s):  
Complex Formation ◽  
Significant Influence ◽  
Room Temperature ◽  
Ph Value ◽  
Maximum Activity ◽  
Reduction Step ◽  
Labelling Yield ◽  
Different Temperatures ◽  
Kinetics Of

SummaryGelchromatography column scanning has been used to study the fractions of 99mTc-pertechnetate, 99mTcchelate and reduced hydrolyzed 99mTc in preparations of 99mTc-EDTA(Sn) and 99mTc-DTPA(Sn). The labelling yield of 99mTc-EDTA(Sn) chelate was as high as 90—95% when 100 μmol EDTA · H4 and 0.5 (Amol SnCl2 was incubated with 10 ml 99mTceluate for 30—60 min at room temperature. The study of the influence of the pH-value on the fraction of 99mTc-EDTA shows that pH 2.8—2.9 gave the best labelling yield. In a comparative study of the labelling kinetics of 99mTc-EDTA(Sn) and 99mTc- DTPA(Sn) at different temperatures (7, 22 and 37°C), no significant influence on the reduction step was found. The rate constant for complex formation, however, increased more rapidly with increased temperature for 99mTc-DTPA(Sn). At room temperature only a few minutes was required to achieve a high labelling yield with 99mTc-DTPA(Sn) whereas about 60 min was required for 99mTc-EDTA(Sn). Comparative biokinetic studies in rabbits showed that the maximum activity in kidneys is achieved after 12 min with 99mTc-EDTA(Sn) but already after 6 min with 99mTc-DTPA(Sn). The long-term disappearance of 99mTc-DTPA(Sn) from the kidneys is about five times faster than that for 99mTc-EDTA(Sn).

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