ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTPolymer Micelles Stabilization on Demand through Reversible Photo-Cross-LinkingJinqiang Jiang, Bo Qi, Martin Lepage, and Yue ZhaoView Author Information Département de chimie médecine nucléaire et radiobiologie Centre d'imagerie moléculaire Sherbrooke, Université Québec, Canada J1K 2R1 Cite this: Macromolecules 2007, 40, 4, 790–792Publication Date (Web):January 17, 2007Publication History Received27 October...

Given the adoption of ultrahigh-voltage ac and dc power transmission, it is desirable to develop a new kind oil-paper insulation system, with higher dielectric strength smaller volume compared conventional systems, in order reduce mass high-voltage transformers improve their long-term operational reliability [1], [2]. Methods improving properties have therefore been widely investigated [3], [4]. The most influential factors affecting performance systems are low transformer oil its...

Graphene oxide (GO) sheets were chemically grafted with thermotropic liquid crystalline epoxy (TLCP).Then we fabricated composites using TLCP-g-GO as reinforcing filler.The mechanical properties and thermal of systematically investigated.It is found that the are enhanced effectively by addition fillers.For instance, containing 1.0 wt% present impact strength 51.43 kJ/m 2 , tensile increase from 55.43 to 80.85 MPa, flexural modulus more than 48%.Furthermore, incorporation fillers effective...

Golden pomfret is rich in polyunsaturated fatty acids (PUFAs), which are susceptible to oxidative hydrolysis during fermentation. Therefore, the objective of this study was examine roles lipid oxidation and oxidation-derived (FAs) formation specific volatile organic compounds fermented golden pomfret. The results showed there more drastic pre-fermentation period. There a persistent increase superoxide, hydroxyl, singlet oxygen, alkoxy radical levels. Besides, FA levels increased, unsaturated...

Aim: This paper aims to enhance the emphasis of college physical education (P.E.) in psychological P.E. students and provide a reference for innovation teaching methods. Methodology procedures: On basis Internet Things (IoT) deep-learning algorithm, combined with education, effect influence on learning philosophy are comprehensively evaluated through construction evaluation index system students. Results: The theoretical courses colleges universities lack integration psychological-education...

We report the observation of unusual fluorescence emission from an azobenzene-containing polymer micellar solution. An amphiphilic diblock copolymer composed hydrophilic quaternized poly(4-vinyl pyridine) (QP4VP) and a hydrophobic liquid crystalline polymethacrylate bearing azobenzene side groups (PAzoMA) is nonfluorescent in molecularly dissolved state N,N-dimethyl formamide (DMF) but becomes fluorescent as result micellization upon addition water, which confines into core region...

We report on the synthesis and characterization of a new type diblock copolymer that is composed two side-chain liquid crystalline polymers (SCLCP1-block-SCLCP2). The poly{6-[4-(4-methoxyphenylazo)phenoxy]hexyl methacrylate}-block-poly{6-[4-(4-cyanophenyl)phenoxy]hexyl methacrylate} (PAzoMA-b-PBiPMA) was successfully synthesized using reversible addition−fragmentation chain transfer (RAFT) polymerization. Low-polydispersity samples various compositions can be prepared either PAzoMA or PBiPMA...

In order to study the developing process of surface discharges initiated by immobilized metallic particles attached Gas Insulated Substation (GIS) insulators under gradually-raised applying voltages, long-term laboratory tests were conducted on a well-established 220 kV test assembly observe entire evaluation from its inception gradual expansion and eventual occurrence flashover. Real-time detection was record conventional impulse current (CIC) signals, UHF ultrasonic signals light emission...

In this study, microcrystalline cellulose fibers (MCFs) derived from sisal were treated with a hyperbranched aromatic polyamide (HBAP). The modified used to produce composites epoxy resins. Firstly the MCFs silane coupling agent, then HBAP was grown on surface. HBAP-MCFs reinforce HBAP-MCF/epoxy studied by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), dynamic mechanical (DMA), and properties analysis. results show...

Thermotropic liquid crystalline with epoxy groups grafted graphene oxide (LCE-g-GO) was synthesized by (GO), hexamethylene diisocyanate (HDI), and 4,4′-bis-(2-hydroxyhexoxy) biphenyl (BP2) using pyridine dibutyltin dilaurate as catalyst dimethylformamide (DMF) solvent. In this work, the LCE-g-GO nanosheets were characterized Fourier transform infrared spectroscopy (FT-IR), wide angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA),...

Free moving metallic particles are one of the most common defects leading to insulation failures in gas insulated substation (GIS) equipment. The present research is designed diagnose and assess severity levels partial discharge (PD) initiated by free on GIS insulator surface. On a well-established 252 kV experiment platform, long term tests were conducted observe entire development process from its very initiation stage till eventual flashover as applied voltage gradually boosted. Real time...

AIMTo investigate the potential role of microRNA-30a (miR-30a) in esophageal squamous cell carcinoma (ESCC).

Converter transformers use oil-pressboard as its main dielectric medium and are operated mainly in AC-DC composite electric field. Creepage discharge is one of the common defects for insulation, especially converter transformers. Oil-pressboard insulation shows distinctive flashover behaviors surface strengths field from that pure AC or DC Compared to conventional power transformers, there remain bigger challenges realize assessment fault diagnosis Adequate knowledge phenomenon...

Recent experiments have shown that some nanoparticles can influence the breakdown strength of transformer oil under lightning impulse voltage. To reveal working mechanism, this paper presents an experimental study on effect TiO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> and prebreakdown streamer propagation process in oil-based nanofluid both positive negative The test results verify modification has a distinct polar effect: voltage...

Abstract Surface charges have significant impact on the evolution of surface dielectric barrier discharge (SDBD). In this work, role residual repetitively nanosecond pulsed SDBD in atmospheric air is investigated using a two-dimensional fluid model, based assumption preserving distribution at end previous high voltage (HV) pulse. bipolar mode when polarity opposite to that current HV pulse, lower breakdown and more deposited energy can be observed, showing an obvious enhancement SDBD....

TiO2 nanoparticle with good dispersibility and stability in transformer oil was prepared used to modify insulating property of aged oil. It found that space charge decay rate the modified can be significantly enhanced 1.57 times at first 8 s after polarization voltage removed. The results trap characteristics reveal modification not only greatly lower shallow energy level but also increase density, resulting improved transportation via trapping de-trapping process shallower traps.