Polyamines, Ethylene, and Physicochemical Changes in Low-Temperature-Stored Peach (Prunus persicaL. Cv. Maycrest)

1997 ◽  
Vol 45 (9) ◽  
pp. 3406-3410 ◽  
Author(s):  
Daniel Valero ◽  
María Serrano ◽  
María Concepción Martínez-Madrid ◽  
Fernando Riquelme
Keyword(s):  
Low Temperature ◽  
Physicochemical Changes

Low-temperature thermal pretreatment process for recycling inner core of spent lithium iron phosphate batteries

2020 ◽  
pp. 0734242X2095740
Author(s):  
Haijun Bi ◽  
Huabing Zhu ◽  
Lei Zu ◽  
Yong Gao ◽  
Song Gao ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Low Temperature ◽  
Heat Treatment Temperature ◽  
Lithium Iron Phosphate ◽  
Inner Core ◽  
Treatment Time ◽  
Iron Phosphate ◽  
Treatment Temperature ◽  
Heat Treatment Time ◽  
Physicochemical Changes

Spent lithium iron phosphate (LFP) batteries contain abundant strategic lithium resources and are thus considered attractive secondary lithium sources. However, these batteries may contaminate the environment because they contain hazardous materials. In this work, a novel process involving low-temperature heat treatment is used as an alternative pretreatment method for recycling spent LFP batteries. When the temperature reaches 300°C, the dissociation effect of the anode material gradually improves with heat treatment time. At the heat treatment time of 120 minutes, an electrode material can be dissociated. The extension of heat treatment time has a minimal effect on quality loss. The physicochemical changes in thermally treated solid cathode and anode materials are examined through scanning electron microscopy with energy-dispersive X-ray spectroscopy. The heat treatment results in the complete separation of the materials from aluminium foil without contamination. The change in heat treatment temperature has a small effect on the quality of LFP material shedding. When the heat treatment temperature reaches 300°C and the time reaches 120 minutes, heat treatment time increases, and the yield of each particle size is stable and basically unchanged. The method can be scaled up and may reduce environmental pollution due to waste LFP batteries.

Physicochemical changes induced in carp (Cyprinus carpio) fillets by high pressure processing at low temperature

2006 ◽  
Vol 7 (1-2) ◽  
pp. 13-18 ◽  
Author(s):  
Amaral Sequeira-Munoz ◽  
Dominique Chevalier ◽  
Alain LeBail ◽  
Hosahalli S. Ramaswamy ◽  
Benjamin K. Simpson
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Cyprinus Carpio ◽  
High Pressure Processing ◽  
Physicochemical Changes ◽  
Carp Cyprinus Carpio

Investigations into Physicochemical Changes in Thermal Coals during Low-Temperature Ionic Liquid Treatment

2015 ◽  
Vol 29 (11) ◽  
pp. 7080-7088 ◽  
Author(s):  
Joshua Cummings ◽  
Sazal Kundu ◽  
Priscilla Tremain ◽  
Behdad Moghtaderi ◽  
Rob Atkin ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Low Temperature ◽  
Physicochemical Changes ◽  
Ionic Liquid Treatment

scholarly journals Effects of curing on emulsion cold mix asphalts and their extracted binder

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Amélie Thiriet ◽  
Vincent Gaudefroy ◽  
Emmanuel Chailleux ◽  
Jean-Michel Piau ◽  
Frédéric Delfosse ◽  
...  
Keyword(s):  
Low Temperature ◽  
Mechanical Behaviour ◽  
High Moisture ◽  
Physicochemical Changes ◽  
Temperature And Humidity ◽  
Higher Temperature ◽  
Oedometer Tests

AbstractThis paper focuses on the physicochemical changes that happen in cold mix asphalts during curing, and more specifically, while and after transitioning to different simulated seasons. Several tests were carried out in order to better grasp the influence of the weather (temperature and humidity) on the curing of such materials. The mechanical behaviour of the mix was assessed using oedometer tests. The physicochemical evolutions of extracted binders, such as oxidation and rheology, were evaluated. The results show stiffening of the mix and ageing of the binder linked to a higher temperature and a lower humidity. A low temperature and high moisture seem to slow down these evolutions. However the binder behaviour does not explain the whole mix behaviour as the kinetics between them are not always similar. Thus other mechanisms are yet to be found and taken into account to fully understand cold mix asphalts behaviour.

scholarly journals Effects of Curing on Emulsion Cold Mix Asphalts and Their Extracted Binder

2020 ◽  
Author(s):  
Amelie Thiriet ◽  
Vincent Gaudefroy ◽  
Emmanuel Chailleux ◽  
Jean-Michel Piau ◽  
Frédéric Delfosse ◽  
...  
Keyword(s):  
Low Temperature ◽  
Mechanical Behaviour ◽  
High Moisture ◽  
Physicochemical Changes ◽  
Temperature And Humidity ◽  
Higher Temperature ◽  
Oedometer Tests

Abstract This paper focuses on the physicochemical changes that happen in cold mix asphalts during curing, and more specifically, while and after transitioning to different simulated seasons. Several tests were carried out in order to better grasp the influence of the weather (temperature and humidity) on the curing of such materials. The mechanical behaviour of the mix was assessed using oedometer tests. The physicochemical evolutions of extracted binders, such as oxidation and rheology, were evaluated. The results show stiffening of the mix and ageing of the binder linked to a higher temperature and a lower humidity. A low temperature and high moisture seem to slow down these evolutions. However the binder behaviour does not explain the whole mix behaviour as the kinetics between them are not always similar. Thus other mechanisms are yet to be found and taken into account to fully understand cold mix asphalts behaviour.

scholarly journals Effects of β-Cyclodextrin and Sodium Ascorbate on the Chemical Compositions and Sensory Quality of Instant Green Tea Powder during Storage

2019 ◽  
Vol 2019 ◽  
pp. 1-7
Author(s):  
Yan-Hong Zhang ◽  
Gen-Sheng Chen ◽  
Jian-Xin Chen ◽  
Zheng-Quan Liu ◽  
Liao-Yuan Yu ◽  
...  
Keyword(s):  
Amino Acids ◽  
Low Temperature ◽  
Green Tea ◽  
Sensory Quality ◽  
Sodium Ascorbate ◽  
Chemical Compositions ◽  
Microbial Count ◽  
Physicochemical Changes ◽  
Green Tea Powder

The physicochemical changes of the instant green tea powders added with β-cyclodextrin and sodium ascorbate stored at 4°C and 25°C were investigated by determining moisture, polyphenols, caffeine, amino acids, catechins, color, sensory quality, and the total microbial count. The results showed that addition of both β-cyclodextrin (6%, w/w) and sodium ascorbate (2%, w/w) reduced the changes of moisture, polyphenols, and catechins contents, helped to maintain the sensory quality, and limited the microbial count. The low temperature (4°C) was also found to maintain the sensory quality and limit of the microbial count of instant green tea powder. The combination of low temperature and addition of β-cyclodextrin with sodium ascorbate were the best treatment for the storage of instant green tea powder. These results could provide useful information for the quality improvement of instant green tea powder during storage.

scholarly journals Native Species Facing Climate Changes: Response of Calafate Berries to Low Temperature and UV Radiation

Foods ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 196 ◽  
Author(s):  
María Eugenia Romero-Román ◽  
Mauricio Schoebitz ◽  
Richard M. Bastías ◽  
Pablo S. Fernández ◽  
Cristina García-Viguera ◽  
...  
Keyword(s):  
Low Temperature ◽  
Native Species ◽  
High Performance ◽  
Climate Changes ◽  
Global Radiation ◽  
Fruit Size ◽  
Principal Component ◽  
Soluble Solids ◽  
Anthocyanin Content ◽  
Physicochemical Changes

Calafate (Berberis microphylla G. Forst) is a wild bush plant widely distributed in the south of Argentina and Chile. Their blue colored fruits present particular flavor and health benefits attributed to high polyphenol contents biosynthesized by the plant under stress. Studies about correlation of abiotic conditions with anthocyanin profiles and physicochemical features of calafate beneath wild origin environment are not described yet. Hence, this research aimed to evaluate the physicochemical changes, antioxidant activity and anthocyanin content of calafate fruit in relationship to UV solar radiation (W.m−2) and air temperature (°C) environment condition during three consecutive years (2017, 2018, 2019). Variations in fruit anthocyanins were determined by comparison between high performance liquid chromatography (HPLC-DAD-ESI)/MSn and CIEL*a*b* colors parameters. Correlations were analyzed by principal component analysis (PCA). Radiation was negatively correlated with fruit size and weight. Physicochemical aspects such as pH, soluble solids, color, total anthocyanins, flavanols and other phenolic compounds were positively correlated with temperature changes. The quantities of monomeric anthocyanins were dependent on both low temperature and global radiation (reaching 20.01 mg g−1 FW in calafate fruit). These results constitute a valuable resource to understand the structural and physiological plasticity of calafate in facing climate changes for future domestication research as well as for agri-food industrial application.

Exsolution and inversion in pigeonite from the Whin Sill, Northern England

1978 ◽  
Vol 36 (1) ◽  
pp. 474-475
Author(s):  
P.P.K. Smith
Keyword(s):  
High Temperature ◽  
Low Temperature ◽  
Homogeneous Nucleation ◽  
Silicate Mineral ◽  
Antiphase Boundaries ◽  
Two Phase ◽  
Primitive Form ◽  
The Core ◽  
Nucleation Mechanisms ◽  
And Inversion

Grains of pigeonite, a calcium-poor silicate mineral of the pyroxene group, from the Whin Sill dolerite have been ion-thinned and examined by TEM. The pigeonite is strongly zoned chemically from the composition Wo8En64FS28 in the core to Wo13En34FS53 at the rim. Two phase transformations have occurred during the cooling of this pigeonite:- exsolution of augite, a more calcic pyroxene, and inversion of the pigeonite from the high- temperature C face-centred form to the low-temperature primitive form, with the formation of antiphase boundaries (APB's). Different sequences of these exsolution and inversion reactions, together with different nucleation mechanisms of the augite, have created three distinct microstructures depending on the position in the grain.In the core of the grains small platelets of augite about 0.02μm thick have farmed parallel to the (001) plane (Fig. 1). These are thought to have exsolved by homogeneous nucleation. Subsequently the inversion of the pigeonite has led to the creation of APB's.

Low temperature x-ray microanalysis of frozen-hydrated tobacco leaves

1984 ◽  
Vol 42 ◽  
pp. 284-285
Author(s):  
S. Edith Taylor ◽  
Patrick Echlin ◽  
May McKoon ◽  
Thomas L. Hayes
Keyword(s):  
Low Temperature ◽  
Lemna Minor ◽  
Root Tips ◽  
Tobacco Leaves ◽  
X Ray ◽  
Whole Cells ◽  
Carbon Coated ◽  
The Right ◽  
Beam Currents ◽  
The University

Low temperature x-ray microanalysis (LTXM) of solid biological materials has been documented for Lemna minor L. root tips. This discussion will be limited to a demonstration of LTXM for measuring relative elemental distributions of P,S,Cl and K species within whole cells of tobacco leaves.Mature Wisconsin-38 tobacco was grown in the greenhouse at the University of California, Berkeley and picked daily from the mid-stalk position (leaf #9). The tissue was excised from the right of the mid rib and rapidly frozen in liquid nitrogen slush. It was then placed into an Amray biochamber and maintained at 103K. Fracture faces of the tissue were prepared and carbon-coated in the biochamber. The prepared sample was transferred from the biochamber to the Amray 1000A SEM equipped with a cold stage to maintain low temperatures at 103K. Analyses were performed using a tungsten source with accelerating voltages of 17.5 to 20 KV and beam currents from 1-2nA.

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

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