Highly Ductile Epoxy Systems Obtained by Network Topology Modification and Its Influence on Secondary Phase Tougheners

2021 ◽  
Author(s):  
Jian Gao
Keyword(s):  
Network Topology ◽  
Secondary Phase ◽  
Epoxy Systems ◽  
Topology Modification

scholarly journals Highly ductile glassy epoxy systems obtained by network topology modification using partially reacted substructures

Polymer ◽  
2021 ◽  
Vol 212 ◽  
pp. 123260 ◽  
Author(s):  
J. Gao ◽  
X. Chu ◽  
C.K. Henry ◽  
S.C. Santos ◽  
G.R. Palmese
Keyword(s):  
Network Topology ◽  
Epoxy Systems ◽  
Topology Modification

scholarly journals Distributed Signal Signature Minimization Via Network Topology Modification

2020 ◽  
Vol 53 (2) ◽  
pp. 3286-3291
Author(s):  
Mohammad Zamani ◽  
Iman Shames ◽  
Robert Hunjet
Keyword(s):  
Network Topology ◽  
Topology Modification

Electrochromic performance of WO3films: optimization by crystal network topology modification

CrystEngComm ◽  
2015 ◽  
Vol 17 (34) ◽  
pp. 6583-6590 ◽  
Author(s):  
Rui Yu ◽  
Zhao-hui Meng ◽  
Mei-dan Ye ◽  
You-hui Lin ◽  
Nai-bo Lin ◽  
...  
Keyword(s):  
Network Topology ◽  
Crystal Network ◽  
Topology Modification

Observation of solid-state reaction between a thin yttria film and a (0001) α-alumina substrate

1994 ◽  
Vol 52 ◽  
pp. 644-645
Author(s):  
J. R. Heffelfinger ◽  
C. B. Carter
Keyword(s):  
Electron Microscopy ◽  
Solid State ◽  
Solid State Reaction ◽  
Yttrium Aluminum Garnet ◽  
Secondary Phase ◽  
Ceramic Composites ◽  
Alumina Substrate ◽  
Transmission Electron ◽  
Alumina Fibers ◽  
Optical Applications

Transmission-electron microscopy (TEM), scanning-electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS) were used to investigate the solid-state reaction between a thin yttria film and a (0001) α-alumina substrate. Systems containing Y2O3 (yttria) and Al2O3 (alumina) are seen in many technologically relevant applications. For example, yttria is being explored as a coating material for alumina fibers for metal-ceramic composites. The coating serves as a diffusion barrier and protects the alumina fiber from reacting with the metal matrix. With sufficient time and temperature, yttria in contact with alumina will react to form one or a combination of phases shown by the phase diagram in Figure l. Of the reaction phases, yttrium aluminum garnet (YAG) is used as a material for lasers and other optical applications. In a different application, YAG is formed as a secondary phase in the sintering of AIN. Yttria is added to AIN as a sintering aid and acts as an oxygen getter by reacting with the alumina in AIN to form YAG.

Correlation between dislocation, grain boundary and interface of duplex SS in stress corrosion cracking(SCC)

1990 ◽  
Vol 48 (4) ◽  
pp. 928-929
Author(s):  
Wang Zheng-fang ◽  
Z.F. Wang
Keyword(s):  
Stainless Steel ◽  
Thermal Cycle ◽  
Secondary Phase ◽  
Corrosion Cracking ◽  
Coarse Grained ◽  
Test Environment ◽  
Fine Grained ◽  
Evaluation Test ◽  
Welding Thermal Cycle ◽  
Micro Analysis

The main purpose of this study highlights on the evaluation of chloride SCC resistance of the material,duplex stainless steel,OOCr18Ni5Mo3Si2 (18-5Mo) and its welded coarse grained zone(CGZ).18-5Mo is a dual phases (A+F) stainless steel with yield strength:512N/mm2 .The proportion of secondary Phase(A phase) accounts for 30-35% of the total with fine grained and homogeneously distributed A and F phases(Fig.1).After being welded by a specific welding thermal cycle to the material,i.e. Tmax=1350°C and t8/5=20s,microstructure may change from fine grained morphology to coarse grained morphology and from homogeneously distributed of A phase to a concentration of A phase(Fig.2).Meanwhile,the proportion of A phase reduced from 35% to 5-10°o.For this reason it is known as welded coarse grained zone(CGZ).In association with difference of microstructure between base metal and welded CGZ,so chloride SCC resistance also differ from each other.Test procedures:Constant load tensile test(CLTT) were performed for recording Esce-t curve by which corrosion cracking growth can be described, tf,fractured time,can also be recorded by the test which is taken as a electrochemical behavior and mechanical property for SCC resistance evaluation. Test environment:143°C boiling 42%MgCl2 solution is used.Besides, micro analysis were conducted with light microscopy(LM),SEM,TEM,and Auger energy spectrum(AES) so as to reveal the correlation between the data generated by the CLTT results and micro analysis.

Opposite Effect of Lysine on Platelet Aggregation Induced by Arachidonate and by Other Aggregants

1982 ◽  
Vol 48 (01) ◽  
pp. 078-083 ◽  
Author(s):  
C Ts'ao ◽  
S J Hart ◽  
D V Krajewski ◽  
P G Sorensen
Keyword(s):  
Platelet Aggregation ◽  
Secondary Phase ◽  
Aminocaproic Acid ◽  
Adenosine Diphosphate ◽  
Inhibitory Effect ◽  
Human Platelets ◽  
Primary Phase ◽  
High Doses ◽  
The Many ◽  
Induced Aggregation

SummaryEarlier, we found that ε-aminocaproic acid (EACA) inhibited human platelet aggregation induced by adenosine diphosphate (ADP) and collagen, but not aggregation by arachidonic acid (AA). Since EACA is structurally similar to lysine, yet these two agents exhibit vast difference in their antifibrinolytic activities, we chose to study the effect of lysine on platelet aggregation. We used L-lysine-HCl in these studies because of its high solubility in aqueous solutions while causing no change in pH when added to human plasma. With lysine, we repeatedly found inhibition of ADP-, collagen- and ristocetin-induced aggregation, but potentiation of AA-induced aggregation. Both the inhibitory and potentiation effects were dose-dependent. Low doses of lysine inhibited the secondary phase of aggregation; high doses of it also inhibited the primary phase of aggregation. Potentiation of AA-induced aggregation was accompanied by increased release of serotonin and formation of malondialdehyde. These effects were not confined to human platelets; rat platelets were similarly affected. Platelets, exposed to lysine and then washed and resuspended in an artificial medium not containing lysine, remained hypersensitive to AA, but no longer showed decreased aggregation by collagen. Comparing the effects of lysine with equimolar concentrations of sucrose, EACA, and α-amino-n-butyric acid, we attribute the potent inhibitory effect of lysine to either the excess positive charge or H+ and C1− ions. The -NH2 group on the α-carbon on lysine appears to be the determining factor for the potentiation effect; the effect seems to be exerted on the cyclooxygenase level of AA metabolism. Lysine and other chemicals with platelet-affecting properties similar to lysine may be used as a tool for the study of the many aspects of a platelet aggregation reaction.

TOXIC PROPERTIES AND INTAKE SYMPTOMS OF SOME WILD PLANTS IN RELATION TO REPORTED FROM THE FOREST OF NORTH WEST SATPUDA REGION OF MAHARASTRA, INDIA

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
SANJAY A. KHAIRNAR
Keyword(s):  
Secondary Phase ◽  
Wild Plants ◽  
Chemical Components ◽  
World Population ◽  
Poisonous Plants ◽  
North West ◽  
Toxic Plants ◽  
Datura Metel ◽  
Croton Tiglium ◽  
Modern Era

In modern era about 80% of the world population depends on herbal alternative system of medicine. Seventy thousand plants are used in medicine and about 2000 plants are used in Indian Ayurveda. The activities of the curative plants are evaluated by their chemical components. Few of them are important as a medicine but also posses poisonous or toxic properties. The toxicity is produced in them due to the synthesis of toxic chemical compounds may be in primary or secondary phase of their life. Most of the users of such medicinal plants in crude form are tribal and peoples living in the forests and their domestic stock . Most of the time these peoples may not aware about the toxicity of such plants used by them and probably get affected sometimes even leads to death. In the study area during the field survey of poisonous plants, information are gathered from the traditional practicing persons, cow boy and from shepherds. About 20 plant species belonging to 17 families are reported as a medicinal as well as toxic. From the available literature, nature of toxic compound and symptoms of their intake on human being are recorded. In the study area the plants like, Abrus precatorious commonly known as a Gunj or Gunjpala, Jatropha curcas , (Biodiesel plant), Croton tiglium (Jamalgota), Citrullus colocynthis (Kadu Indrawan, Girardinia diversifolia (Agya), Mucuna purriens (Khajkuairi), Euphorbia tirucali (Sher), E. ligularia (Sabarkand), Datura metel ( Kala Dhotara), Datura inoxia (Pandhara Dhotara) and Asparagus racemo-sus (Shatavari) etc . are some of the toxic plants used as a medicine and harmful also.

EXCAVATIONS AT THE ROMAN FORT OF BAR HILL, 1978-82

1985 ◽  
Vol 12 (1) ◽  
pp. 49-81 ◽  
Author(s):  
L J F Keppie
Keyword(s):  
Secondary Phase ◽  
George Macdonald ◽  
Pottery Kiln ◽  
Labour Camp

Summary Excavation of this Antonine Wall fort, previously explored by Sir George Macdonald and Mr Alexander Park in 1902-05, has exposed the bathhouse and headquarters building (principia) for permanent public view. The sequence of rooms in the bathhouse is now better understood; set into one wall of its main furnace was a small pottery kiln, from which came some 900 sherds in a distinctive fabric, showing strong influences from N Africa. In the headquarters building, a dais was recognised at the SW corner of the crosshall, and a strongbox in the floor of a room in the rear range. In a secondary phase the W half of the courtyard was converted to house a timber-framed storebuilding. The defences and part of the interior of the underlying ‘fortlet’ were examined; its clay rampart was located, and several possible cooking areas. Most probably, despite the recovery of some native finds, the ‘fortlet’ should be seen as a Roman labour-camp associated with the building of the Antonine Wall hereabouts. From its ditch came hawthorn twigs and branches, which along with blocks of turf had served to pack the ditch when the fort was built on top.

Shape memory epoxy systems with a wide range of switching temperature

2017 ◽  
Vol 39 (1) ◽  
pp. 7-13
Author(s):  
Ye.P. Mamunya ◽  
◽  
O.K. Matkovska ◽  
O.V. Zinchenko ◽  
E.V. Lebedev ◽  
...  
Keyword(s):  
Shape Memory ◽  
Wide Range ◽  
Switching Temperature ◽  
Epoxy Systems
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