scholarly journals Detection of Decaying Aroma of Salak Pondoh (Salacca edulis reinw) in Fifteen Days Storage at Room Temperature

2018 ◽  
Vol 5 (2) ◽  
Author(s):  
Dika Intan Ayudiaswati ◽  
Anang Mohamad Legowo ◽  
Ahmad Ni'matullah Al-Baarri ◽  
Mulyana Hadipernata ◽  
Wisnu Broto ◽  
...  
Keyword(s):  
Room Temperature ◽  
Aseptic Condition ◽  
Three Stages ◽  
Last Stage

Salak pondoh (Salacca edulis reinw) is one of horticulture product that easily to decay. Decaying aroma is one of indicators for qualities loss of salak pondoh. The purpose of this research is to detect the decay aroma of salak pondoh during the storage of 15 days. The preservation was categorized into three stages of preservation time: early, middle, and last day. All salak was preserved in room temperature at aseptic condition with detected humidity at 50-60%. According to the obtained data, it was detected that decay aroma was detected in 80% of salak in last stage of preservation. Amazingly, 5% of salak at this stage was not detected its decay aroma. As conclusion, decay of salak could be determined by the decay aroma and mostly it was appeared in the last stage of preservation.

Formation of Dislocation Channels in Neutron Irradiated Molybdenum

1972 ◽  
Vol 30 ◽  
pp. 672-673
Author(s):  
S. Mahajan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ambient Temperature ◽  
Room Temperature ◽  
Channel Formation ◽  
Early Stages ◽  
Transmission Electron ◽  
Three Stages ◽  
Two Stages ◽  
Polycrystalline Molybdenum

The evolution of dislocation channels in irradiated metals during deformation can be envisaged to occur in three stages: (i) formation of embryonic cluster free regions, (ii) growth of these regions into microscopically observable channels and (iii) termination of their growth due to the accumulation of dislocation damage. The first two stages are particularly intriguing, and we have attempted to follow the early stages of channel formation in polycrystalline molybdenum, irradiated to 5×1019 n. cm−2 (E > 1 Mev) at the reactor ambient temperature (∼ 60°C), using transmission electron microscopy. The irradiated samples were strained, at room temperature, up to the macroscopic yield point.Figure 1 illustrates the early stages of channel formation. The observations suggest that the cluster free regions, such as A, B and C, form in isolated packets, which could subsequently link-up to evolve a channel.

A Facile, Efficient and Selective Deprotection of P - Methoxy Benzyl Ethers Using Zinc (II) Trifluoromethanesulfonate

2019 ◽  
Vol 16 (12) ◽  
pp. 955-958
Author(s):  
Reddymasu Sireesha ◽  
Reddymasu Sreenivasulu ◽  
Choragudi Chandrasekhar ◽  
Mannam Subba Rao
Keyword(s):  
Room Temperature ◽  
Protecting Groups ◽  
Side Reactions ◽  
Reaction Conditions ◽  
Acid Sensitivity ◽  
Time Period ◽  
Protective Groups ◽  
Benzyl Ethers ◽  
Last Stage ◽  
Zinc Triflate

: Deprotection is significant and conducted over mild reaction conditions, in order to restrict any more side reactions with sensitive functional groups as well as racemization or epimerization of stereo center because the protective groups are often cleaved at last stage in the synthesis. P - Methoxy benzyl (PMB) ether appears unique due to its easy introduction and removal than the other benzyl ether protecting groups. A facile, efficient and highly selective cleavage of P - methoxy benzyl ethers was reported by using 20 mole% Zinc (II) Trifluoromethanesulfonate at room temperature in acetonitrile solvent over 15-120 min. time period. To study the generality of this methodology, several PMB ethers were prepared from a variety of substrates having different protecting groups and subjected to deprotection of PMB ethers using Zn(OTf)2 in acetonitrile. In this methodology, zinc triflate cleaves only PMB ethers without affecting acid sensitivity, base sensitivity and also chiral epoxide groups.

scholarly journals Microstructural and Mechanical Characterization of Al-0.80Mg-0.85Si-0.3Zr Alloy

2017 ◽  
Vol 17 (4) ◽  
pp. 73-78 ◽  
Author(s):  
F. Kahrıman ◽  
M. Zeren
Keyword(s):  
Mechanical Properties ◽  
Automotive Industry ◽  
Room Temperature ◽  
Tensile Tests ◽  
Direct Chill ◽  
Peak Hardness ◽  
Casting Method ◽  
Industry Standard ◽  
Three Stages

Abstract In this study, Al-0.80Mg-0.85Si alloy was modified with the addition of 0.3 wt.-% zirconium and the variation of microstructural features and mechanical properties were investigated. In order to produce the billets, vertical direct chill casting method was used and billets were homogenized at 580 °C for 6 h. Homogenized billets were subjected to aging practice following three stages: (i) solution annealing at 550 °C for 3 h, (ii) quenching in water, (iii) aging at 180 °C between 0 and 20 h. The hardness measurements were performed for the alloys following the aging process. It was observed that peak hardness value of Al-0.80Mg-0.85Si alloy increased with the addition of zirconium. This finding was very useful to obtain aging parameters for the extruded hollow profiles which are commonly used in automotive industry. Standard tensile tests were applied to aged profiles at room temperature and the results showed that modified alloy had higher mechanical properties compared to the non-modified alloy.

scholarly journals CERAMIC ASSEMBLAGES OF THE THIRD QUARTER OF THE 15th CENTURY FROM THE FUNA CASTLE: UTENSILS OF THE «GARRISON KITCHEN»

2020 ◽  
Vol 34 (1) ◽  
pp. 31-67
Author(s):  
I. B. Teslenko
Keyword(s):  
Comparative Analysis ◽  
Historical Events ◽  
Archaeological Evidence ◽  
The Third ◽  
15Th Century ◽  
The Crimea ◽  
Three Stages ◽  
Last Stage ◽  
Ceramic Assemblages

The Funa fortress is located in southern Crimea and is one of the reference architectural and archaeological complexes of the Northern Pontic Region with precise date of existence. The fortress was built by Mangup authorities near 1423 on the border with possessions of Genoese and was destroyed in a fire during the Turkish invasion of the Crimea in 1475. The detailed chronology of the site which includes three stages of its construction history — 1423, 1425—1450s and 1459—1475, has been developed so far. So it becomes possible to clarify the dating of ceramic finds in line with these periods also. Ceramic assemblages of the last stage from the layers of fire and destruction of 1475 are the most representative. There is the complex from courtyard 1 among them. The ceramic collection includes 101 and 163 fully or partially reconstructed vessels respectively. There are large and average household containers, various kitchen utensils and tableware, both of the local Crimean production and import (Miletus Ware, Spanish Luster and Blue and White Ware, Fritware). The comparative analysis of artefacts made it possible to establish the chronological changes in ceramic assemblages during 25 years. Moreover, statistical and typological studies of the pottery from the layer of fire demonstrated a set of vessels there is suitable for cooking and table setting for at least 40 people. Large number of luxury tableware for diverse using and their location in the context allow suggest that there was a large feast on the platform above the «kitchen», and the remains of this banquet were not removed. According to the archaeological evidence as well as analysis of historical events the inhabitants of the fortress could burn it themselves before Turkish invasion and retreat to the capital of the principality at Mangup. Perhaps the remains of a farewell feast arranged just before leaving was fixed archaeologically.

Effect of Silicon on the Microstructure, Tensile Properties and Hot Tearing Susceptibility of AZ91E Alloy

2012 ◽  
Vol 706-709 ◽  
pp. 3046-3051
Author(s):  
Comondore Ravindran ◽  
Sophie Lun Sin
Keyword(s):  
Grain Size ◽  
Tensile Strength ◽  
Tensile Properties ◽  
Room Temperature ◽  
Hot Tearing ◽  
Chinese Script ◽  
Az91 Alloy ◽  
Solidification Behavior ◽  
Last Stage ◽  
Hot Tearing Susceptibility

This Research Focused on Studying the Effect of Silicon on the Hot Tearing Susceptibility of Permanent Mould Cast AZ91E Magnesium Alloy. Varying Amounts of Silicon (0.5, 1.0 and 1.5 Wt.%) Were Added to AZ91E in the Form of an Al-53 Wt.% Si Master Alloy. the Microstructure, Grain Size and Solidification Behavior of each Alloy Were Characterized and Related to their Tensile Properties and Hot Tearing Susceptibility. the Results Showed that the Tensile Strength and the Elongation of AZ91 Alloy Decreased with the Addition of Silicon at Room Temperature, due to the Formation of Chinese Script Mg2si Particles. however, Silicon Significantly Reduced the Hot Tearing Susceptibility of AZ91E. this Was Attributed to the Reduction of the Grain Size and the Decreased Freezing Range of AZ91E, which Contributed to Improve the Interdendritic Feeding during the Last Stage of Solidification.

scholarly journals The Design Process at Le Corbusier, Case of the Ronchamp Chapel

2019 ◽  
Vol 1 (1) ◽  
pp. 1275-1282
Author(s):  
Nadjat Outmoune ◽  
Abdelmalek Arrouf
Keyword(s):  
Empirical Studies ◽  
Data Gathering ◽  
Le Corbusier ◽  
Generic Model ◽  
Design Activity ◽  
Genetic Method ◽  
Second Stage ◽  
Three Stages ◽  
Last Stage

AbstractThis work falls within the empirical studies of design activity. Its project is to understand Le Corbusier's designing way and how does he work and structure his design processes. Doing so, it jumps above the descriptive and doctrinal knowledge of objects produced by “Le Corbusier” to study the actions and mechanisms that led to them.To achieve its aim, this study uses genetic method, developed by P.M. De Biasi of literary origin, this research method is made of three stages. The first one, which is of empirical nature, is one of data gathering. It leads to the establishment of genesis tables and to the classification of the all collected documents. The second stage, makes the analysis of all the collected documents one by one. It allows the restitution of the creative process of one projects “Le Corbusier” which is “la chapelle de Notre Dame du haut de Ronchamp”. The last stage is finally that define the design processe of the this project. The results show that the design activity of “Le Corbuiser” obeys the overall logic of one generic model which may be called his individual designing style.

scholarly journals Accelerating the Morphogenetic Cycle of the Viral Vector Aedes aegypti Larvae for Faster Larvicidal Bioassays

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
José Domingos Fontana ◽  
Rafael Lopes Ferreira ◽  
Tatiana Zuccolotto ◽  
Cibelle de Borba Dallagassa ◽  
Leonardo Pellizzari Wielewski ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Room Temperature ◽  
Food Source ◽  
Viral Vector ◽  
Low Cost ◽  
Mosquito Species ◽  
Larval Growth ◽  
Fourth Instar ◽  
Coconut Water ◽  
Last Stage

Any bioassay to test new chemically synthesized larvicides or phytolarvicides against Culicidae and more harmful mosquito species, such as Aedes aegypti and Aedes albopictus, which specifically transmit dengue, yellow fever, chikungunya viral fevers as well as Zika virus, or Anopheles gambiae, a vector for malaria and philariasis, requires thousands of well-developed larvae, preferably at the fourth instar stage. The natural morphogenetic cycle of Aedes spp., in the field or in the laboratory, may extend to 19 days at room temperature (e.g., 25°C) from the first permanent contact between viable eggs and water and the last stage of larval growth or metamorphosis into flying adults. Thus, accelerated sequential molting is desirable for swifter bioassays of larvicides. We achieved this goal in Aedes aegypti with very limited strategic and low-cost additions to food, such as coconut water, milk or its casein, yeast extract, and to a lesser extent, glycerol. The naturally rich coconut water was excellent for quickly attaining the population of instar IV larvae, the most advanced one before pupation, saving about a week, for subsequent larvicidal bioassays. Diluted milk, as another food source, allowed an even faster final ecdysis and adults are useful for mosquito taxonomical purpose.

scholarly journals Study on the Microstructure of the Pinctada martensii Pearls and Its Significance

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Wenlong Wu ◽  
Liping Zhang ◽  
Zhijun Yang ◽  
Weisheng Hou
Keyword(s):  
Raman Spectra ◽  
Early Stage ◽  
Formation Processes ◽  
High Quality ◽  
Middle Stage ◽  
Pinctada Martensii ◽  
Medium Quality ◽  
Three Stages ◽  
Last Stage ◽  
Crystalline Plane

The results of a microscopy, SEM-EDS, XRD, FTIR, and Raman spectra study of the nacres of the Pinctada martensii pearls from Zhanjiang city, China shows that they can be classified as the high-quality, medium-quality, and inferior-quality pearls. Aragonite, the main inorganic mineralogy in the nacres, was crystallized and grown up in the compartments formed by the silk and radial organic sheets originating from organic matters secreted by the mantle of mollusks. The crystalline orientations of aragonite tablets were changed from the (002), (012) and (102) crystalline plane nets in the early to the (002) crystalline plane net only in the later. The formation processes of the microstructure of the nacres could be divided into three stages. In the early stage, the precursor particles of aragonite nucleated and grew up fast; then, porous aragonite aggregates consisting of the fine aragonite crystals were formed. In the middle stage, the aragonite crystals directionally grew up to form the aragonite tablets and microlayers. The surface of the aragonite tablets and microlayers are rough and few porous, and the edges of the crystals were serrated. In the last stage, the aragonite tablets in the aragonite microlayer mixed perfectly together to form high-quality aragonite layer whose surface was smooth and perfect.

scholarly journals A Mobility Determination Method for Parallel Platforms Based on the Lie Algebra of SE(3) and Its Subspaces

2021 ◽  
pp. 1-12
Author(s):  
Alejandro de Jesús Sánchez-García ◽  
José M. Rico ◽  
J. Jesús Cervantes-Sánchez ◽  
Pablo Lopez-Custodio
Keyword(s):  
Lie Algebra ◽  
Screw Theory ◽  
Determination Method ◽  
Mobility Analysis ◽  
Euclidean Group ◽  
Second Stage ◽  
Direct Sum ◽  
Three Stages ◽  
Last Stage ◽  
Special Euclidean Group

Abstract This contribution presents a screw theory-based method for determining the mobility of fully parallel platforms. The method is based in the application of three stages. The first stage involves the application of the intersection of the subalgebras of Lie algebra, se(3), of the special Euclidean group, SE(3), associated with the legs of the platform. The second stage analyzes the possibility of the legs of the platform generating a sum or direct sum of two subalgebras of the Lie algebra, se(3). The last stage, if necessary, considers the possibility of the kinematic pairs of the legs satisfying certain velocity conditions; these conditions allow to reduce the platform's mobility analysis to one that can solved using one of the two previous stages.

scholarly journals Slivers of Hope: Women in Dystopian Trilogy

2021 ◽  
Vol 3 (2) ◽  
pp. 81-91
Author(s):  
Josephine May Grace Aclan Famoso
Keyword(s):  
Women Characters ◽  
Feminist Theory ◽  
Main Character ◽  
Hunger Games ◽  
Woman Character ◽  
The Hunger Games ◽  
Three Stages ◽  
Last Stage ◽  
Katniss Everdeen

This paper explores the struggles, goals, and motivations of the women characters in The Hunger Games Trilogy. In detail, the study employs Elaine Showalter’s Feminist theory to reveal the women characters’ categories in terms of three stages: feminine, feminist and female. In the study, some of the women characters living in the dehumanized society of Panem have attained the last stage of feminism which is the female stage. However, other women characters are not able to fulfill their goals. Still, due to the women characters’ demand to change the system, they start an uprising. For example, the main character, Katniss Everdeen, contributes to the collapse of the ruling government in power as she accepts being the Mockingjay, the symbol of revolution. Another woman character to exemplify such a noble act is Johanna Mason who becomes part of the rebellion and survives the war against the unjust ruling of the Capitol. These women characters are slivers of light amidst the chaos. In conclusion, it is discovered that women characters play pivotal roles in society. This suggests that women characters recognize their power to accelerate societal advancement. For this dystopian trilogy, in particular, women become symbols of hope.

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