Evading the strength–ductility trade-off dilemma of rigid thermosets by incorporating triple cross-links of varying strengths

2020 ◽  
Vol 11 (39) ◽  
pp. 6281-6287
Author(s):  
Cheng Wang ◽  
Shuai Zhang ◽  
Longfei Zhang ◽  
Yewei Xu ◽  
Lin Zhang
Keyword(s):  
Trade Off ◽  
New Class ◽  
Cross Links

A new class of rigid thermosets with simultaneously enhanced strengths and ductilities have been successfully designed and synthesised.

ChemInform Abstract: Improved Transparency-Efficiency Trade-Off in a New Class of Nonlinear Organosilicon Compounds.

ChemInform ◽  
2010 ◽  
Vol 23 (5) ◽  
pp. no-no
Author(s):  
G. MIGNANI ◽  
M. BARZOUKAS ◽  
J. ZYSS ◽  
G. SOULA ◽  
F. BALEGROUNE ◽  
...  
Keyword(s):  
Organosilicon Compounds ◽  
Trade Off ◽  
New Class

scholarly journals Photochemical and photobiological properties of furocoumarins and homologues drugs

1999 ◽  
Vol 1 (1) ◽  
pp. 1-6 ◽  
Author(s):  
F. Bordin
Keyword(s):  
Side Effects ◽  
Chromosomal Aberrations ◽  
Single Step ◽  
Therapeutic Effectiveness ◽  
Severe Damage ◽  
New Class ◽  
Cell Components ◽  
Cross Links ◽  
Monofunctional Adducts

Furocoumarins are natural photosensitizing drugs used in PUVA photochemotherapy and in photopheresis. Their therapeutic effectiveness is connected to the lesions they induce to various cell components, membranes, ribosomes, mitochondria, and in particular to DNA, damaged by formation of monofunctional adducts and of inter-strand cross-links (ISC). ISC represent a severe damage, mainly correlated to the main side effects observed in photochemotherapy, skin phototoxicity and genotoxicity. Searching for new monofunctional derivatives, two tetramethylfuroquinolinones, 1,4,6,8-tetramethyl-2H-furo[2,3-h]quinolin-2- one (FQ) and 4,6,8,9-tetramethyl-2H-furo[2,3-h]-quinolin-2-one (HFQ) were studied. Both compounds are very active; however while FQ produced many chromosomal aberrations and strong skin erythemas, HFQ practically did not induce such side effects. FQ and HFQ formed high levels of monoadducts but no ISC in DNA, but both provoked many DNA-protein cross-links (DPC). FQ induced these lesions by a biphotonic reaction: at first a furan-side monoadduct is formed, which is then converted into a DPC; thus the FQ molecule seemed to form the bridge between DNA and proteins. HFQ formed DPC by a single step (DPC at zero length, like UVC). For these features, HFQ appears to be the first molecule belonging to a new class of active but not phototoxic drugs for photomedicine.

scholarly journals Donor–acceptor organo-imido polyoxometalates: high transparency, high activity redox-active NLO chromophores

2016 ◽  
Vol 45 (7) ◽  
pp. 2818-2822 ◽  
Author(s):  
Ahmed Al-Yasari ◽  
Nick Van Steerteghem ◽  
Hani El Moll ◽  
Koen Clays ◽  
John Fielden
Keyword(s):  
Linear Optics ◽  
Performance Limits ◽  
Trade Off ◽  
High Transparency ◽  
Non Linear Optics ◽  
New Class ◽  
Redox Active ◽  
Empirical Performance ◽  
Donor Acceptor ◽  
Nlo Chromophores

Organoimido polyoxometalates are a powerful new class of acceptor for non-linear optics. As a basis for donor–acceptor systems, they offer an excellent transparency/non-linearity trade-off and break through empirical performance limits for comparable organic materials.

Spiro Cross-Links:  Representatives of a New Class of Glycoxidation Products

2003 ◽  
Vol 51 (16) ◽  
pp. 4810-4818 ◽  
Author(s):  
Oliver Reihl ◽  
Klaus M. Biemel ◽  
Wolfgang Eipper ◽  
Markus O. Lederer ◽  
Wolfgang Schwack
Keyword(s):  
New Class ◽  
Cross Links

Improved transparency-efficiency trade-off in a new class of nonlinear organosilicon compounds

1991 ◽  
Vol 10 (10) ◽  
pp. 3660-3668 ◽  
Author(s):  
G. Mignani ◽  
M. Barzoukas ◽  
J. Zyss ◽  
G. Soula ◽  
F. Balegroune ◽  
...  
Keyword(s):  
Organosilicon Compounds ◽  
Trade Off ◽  
New Class

scholarly journals Anonymous Stochastic Routing

2021 ◽  
Author(s):  
Mine Su Erturk ◽  
Kuang Xu
Keyword(s):  
Random Perturbation ◽  
Large Network ◽  
Trade Off ◽  
New Class ◽  
Stochastic Routing ◽  
Network Topologies ◽  
Entire Trajectory

We propose and analyze a recipient-anonymous stochastic routing model to study a fundamental trade-off between anonymity and routing delay. An agent wants to quickly reach a goal vertex in a network through a sequence of routing actions, whereas an overseeing adversary observes the agent’s entire trajectory and tries to identify the agent’s goal among those vertices traversed. We are interested in understanding the probability that the adversary can correctly identify the agent’s goal (anonymity) as a function of the time it takes the agent to reach it (delay). A key feature of our model is the presence of intrinsic uncertainty in the environment, so that each of the agent’s intended steps is subject to random perturbation and thus may not materialize as planned. Using large-network asymptotics, our main results provide near-optimal characterization of the anonymity–delay trade-off under a number of network topologies. Our main technical contributions are centered on a new class of “noise-harnessing” routing strategies that adaptively combine intrinsic uncertainty from the environment with additional artificial randomization to achieve provably efficient obfuscation.

In Situ microscopy of the anodic etching of silicon

1995 ◽  
Vol 53 ◽  
pp. 232-233
Author(s):  
Frances M. Ross ◽  
Peter C. Searson
Keyword(s):  
Composite Structures ◽  
High Surface ◽  
High Surface Area ◽  
Chemical Properties ◽  
Selective Etching ◽  
Silicon On Insulator ◽  
Second Phase ◽  
Porous Layers ◽  
New Class ◽  
Porous Semiconductors

Porous semiconductors represent a relatively new class of materials formed by the selective etching of a single or polycrystalline substrate. Although porous silicon has received considerable attention due to its novel optical properties1, porous layers can be formed in other semiconductors such as GaAs and GaP. These materials are characterised by very high surface area and by electrical, optical and chemical properties that may differ considerably from bulk. The properties depend on the pore morphology, which can be controlled by adjusting the processing conditions and the dopant concentration. A number of novel structures can be fabricated using selective etching. For example, self-supporting membranes can be made by growing pores through a wafer, films with modulated pore structure can be fabricated by varying the applied potential during growth, composite structures can be prepared by depositing a second phase into the pores and silicon-on-insulator structures can be formed by oxidising a buried porous layer. In all these applications the ability to grow nanostructures controllably is critical.

The microtubule associated protein (MAP) tau forms a new class of triple-stranded left-hand helical fibrous protein polymer

1992 ◽  
Vol 50 (1) ◽  
pp. 540-541
Author(s):  
G. C. Ruben ◽  
K. Iqbal ◽  
I. Grundke-Iqbal ◽  
H. Wisniewski ◽  
T. L. Ciardelli ◽  
...  
Keyword(s):  
Axial Ratio ◽  
Normal Structure ◽  
Paired Helical Filaments ◽  
Left Hand ◽  
New Class ◽  
Protein Polymer ◽  
Fibrous Protein ◽  
Protein Map ◽  
Neurotransmitter Transport ◽  
Alzheimer Neurofibrillary Tangles

In neurons, the microtubule associated protein, tau, is found in the axons. Tau stabilizes the microtubules required for neurotransmitter transport to the axonal terminal. Since tau has been found in both Alzheimer neurofibrillary tangles (NFT) and in paired helical filaments (PHF), the study of tau's normal structure had to preceed TEM studies of NFT and PHF. The structure of tau was first studied by ultracentrifugation. This work suggested that it was a rod shaped molecule with an axial ratio of 20:1. More recently, paraciystals of phosphorylated and nonphosphoiylated tau have been reported. Phosphorylated tau was 90-95 nm in length and 3-6 nm in diameter where as nonphosphorylated tau was 69-75 nm in length. A shorter length of 30 nm was reported for undamaged tau indicating that it is an extremely flexible molecule. Tau was also studied in relation to microtubules, and its length was found to be 56.1±14.1 nm.

Study of eukaryotic flagellar components by cryo-electron microscopy

1986 ◽  
Vol 44 ◽  
pp. 98-101
Author(s):  
John M. Murray ◽  
Rob Ward
Keyword(s):  
Electron Microscopy ◽  
Primary Motion ◽  
Cryo Electron Microscopy ◽  
Cross Links ◽  
Cilia And Flagella

The eukaryotic flagellum is constructed from 11 parallel tubular elements arranged as 9 peripheral fibers (doublet microtubules) and 2 central fibers (singlet microtubules). The primary motion generating component has been found to be arranged as axially periodic “arms” bridging the adjacent doublets. The dynein, comprising the arms, has been isolated and characterized from several different cilia and flagella. Various radial and azimuthal cross-links stabilize the axially aligned microtubules, and probably play some role in controlling the form of the flagella beat cycle.

Study of segregation in La1.8Sr0.2CuO4 superconductor by STEM-EDS microanalysis

1987 ◽  
Vol 45 ◽  
pp. 54-55
Author(s):  
T. F. Kelly ◽  
P. J. Lee ◽  
E. E. Hellstrom ◽  
D. C. Larbalestier
Keyword(s):  
Rare Earth ◽  
High Field ◽  
Transport Current ◽  
Total Thickness ◽  
New Class ◽  
Ceramic Superconductors ◽  
Current Densities ◽  
Group Ii ◽  
Eds Microanalysis

Recently there has been much excitement over a new class of high Tc (>30 K) ceramic superconductors of the form A1-xBxCuO4-x, where A is a rare earth and B is from Group II. Unfortunately these materials have only been able to support small transport current densities 1-10 A/cm2. It is very desirable to increase these values by 2 to 3 orders of magnitude for useful high field applications. The reason for these small transport currents is as yet unknown. Evidence has, however, been presented for superconducting clusters on a 50-100 nm scale and on a 1-3 μm scale. We therefore planned a detailed TEM and STEM microanalysis study in order to see whether any evidence for the clusters could be seen.A La1.8Sr0.2Cu04 pellet was cut into 1 mm thick slices from which 3 mm discs were cut. The discs were subsequently mechanically ground to 100 μm total thickness and dimpled to 20 μm thickness at the center.

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