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31.
Phuong H. Hoang Anand Gangadharan Suresh C. Ramalingam 《Nuclear Engineering and Design》1998,181(1-3)
The Palisades nuclear plant has developed a comprehensive inspection program to support safe, reliable, and cost-effective operation of all Alloy 600 nozzles and safe ends in the primary coolant system (PCS). As a part of the Palisades Alloy 600 Project, an inspection prioritization scheme was developed to help the plant focus its resources on high-risk components and plan appropriate inspection activities for the other components. The inspection prioritization scheme is based on the susceptibility of the components to primary water stress corrosion cracking (PWSCC), component failure consequences, component leak detectability and component radiation exposure. The scheme provides a simple, systematic and technical base for selecting Alloy 600 components for inspection. The scheme, however, could be used to develop an inspection schedule or to select the highest priority components for mitigation or replacement. 相似文献
32.
Ozone-mediated polyol synthesis from soybean oil 总被引:4,自引:0,他引:4
Phuong?Tran Daniel?Graiver Ramani?NarayanEmail author 《Journal of the American Oil Chemists' Society》2005,82(9):653-659
Polyols from vegetable oils can replace petroleumbased polyols in the preparation of polyurethanes and polyesters in a wide
range of applications. However, previous preparation methods are either too costly, inefficient, or yield secondary alcohols,
which are less reactive than the desired primary alcohols. The objectives of this study were to prepare primary soy-based
polyols by a new catalytic ozonolysis process and to characterize the composition of the product mixture. In this new process,
the polyols were prepared by passing ozone through a solution of soybean oil and ethylene glycol in the presence of an alkaline
catalyst. Unlike conventional ozonolysis that yields aldehydes and carboxylic acids by spontaneous decomposition of the ozonide
intermediates, the ozonides in our method reacted with the hydroxyl group of the glycol to form an ester linkage with a terminal
hydroxy group. Statistical analysis of the product mixture indicates that the resulting polyol mixture is more uniform than
the original TG mixture, having (2-hydroxy)nonanoate as the major component of the new hydroxyl functional TG. The chemical
structure of the polyols produced was further characterized by iodine number and 13C NMR and FTIR spectroscopy, which confirmed the cleavage of the double bonds, the presence of hydroxyl groups, and the formation
of new ester linkages. 相似文献
33.
34.
Bich Phuong Dang Alan F Wolfschoon Pombo Ulrich Kulozik 《International Journal of Dairy Technology》2019,72(2):295-302
Water mobility changes during a structure building reaction of full‐fat cream cheese were studied by applying low‐resolution nuclear magnetic resonance. A significant decrease in mobility (T2 relaxation times from 148 to 116 ms) was found in the mobile water phase during texture building. Furthermore, the results were compared to forced synaeresis of the same cheese, which was determined by applying a multistep centrifugation method. The plotted forced synaeresis results displayed the inverse shape of the structure building reaction: ~14.6% at the beginning (0 min), ~7.4% at peak (47 min) of the reaction and ended with ~9.9% (126 min). 相似文献
35.
Toan Dinh Van Dau Canh‐Dung Tran Tuan‐Khoa Nguyen Hoang‐Phuong Phan Nam‐Trung Nguyen Dzung Viet Dao 《大分子材料与工程》2019,304(6)
Flexible multifunctional electronic devices are of high interest for a wide range of applications including thermal therapy and respiratory devices in medical treatment, safety equipment, and structural health monitoring systems. This paper reports a scalable and efficient strategy of manufacturing a polyacrylonitrile‐carbon nanotube‐polyacrylonitrile (PAN‐CNT‐PAN) robust flexible platform for multifunctional electronic devices including flexible heaters, temperature sensors, and flexible thermal flow sensors. The key advantages of this platform include low cost, porosity, mechanical robustness, and electrical stability under mechanical bending, enabling the development of fast‐response flexible heaters with a response time of ≈1.5 s and relaxation time of ≈1.7 s. The temperature‐sensing functionality is also investigated with a range of temperature coefficient of resistances from ?650 to ?900 ppm K?1. A flexible hot‐film sensing concept is successfully demonstrated using PAN‐CNT‐PAN with a high sensitivity of 340 mV (m s?1)?1. The sensitivity enhancement of 50% W?1 is also observed with increasing supply power. The low cost, porosity, versatile, and robust properties of the proposed platform will enable the development of multifunctional electronic devices for numerous applications such as flexible thermal management, temperature stabilization in industrial processing, temperature sensing, and flexible/wearable devices for human healthcare applications. 相似文献
36.
The objective of this study was to achieve an optimal formulation of hydrophilic–hydrophobic conjugates for nano-sized solid dispersions (SDs) with enhanced dissolution of multiple drugs in different gastrointestinal (GI) tract environments. A new conjugate powder with an optimized process was used to fabricate SDs that contained three poorly water-soluble drugs that were also poorly soluble in different dissolution media. The self-assembled nanoparticle formation, drug crystallinity and SD molecular interactions were investigated by measuring the particle size during dissolution testing and physicochemical property analysis (powder X-ray diffraction and Fourier transform infrared spectroscopy). Drug release studies indicated that SD containing conjugated powder significantly improved the dissolution rates of these poorly water-soluble drugs in the GI tract. In addition, particle size analysis showed nano-sized particles in the dissolution media in the early stage with a tendency to reduce smaller particles over time. Physicochemical characterizations demonstrated almost amorphous drug states and hydrogen bonding interactions between the drugs and conjugates in the SD. This study optimized a promising material for SD, and the material was shown to have a promising performance under various pH medium conditions with poorly water-soluble drugs. 相似文献
37.
Truong Phuong Phan Alex Truong Buu Suen Benjamin Melles Gerrit Talke Frank 《Microsystem Technologies》2020,26(11):3403-3407
Microsystem Technologies - A low-cost, self-imaging smartphone attachment has been developed for remote slit lamp examination of the human eye. The device is designed with off-the-shelf optical... 相似文献
38.
Toan Dinh Thanh Nguyen Hoang‐Phuong Phan Tuan‐Khoa Nguyen Van Thanh Dau Nam‐Trung Nguyen Dzung Viet Dao 《Small (Weinheim an der Bergstrasse, Germany)》2020,16(14)
Stretchable and wearable sensor technology has attracted significant interests and created high technological impact on portable healthcare and smart human–machine interfaces. Wearable electromechanical systems are an important part of this technology that has recently witnessed tremendous progress toward high‐performance devices for commercialization. Over the past few years, great attention has been paid to simultaneously enhance the sensitivity and stretchability of the electromechanical sensors toward high sensitivity, ultra‐stretchability, low power consumption or self‐power functionalities, miniaturisation as well as simplicity in design and fabrication. This work presents state‐of‐the‐art advanced materials and rational designs of electromechanical sensors for wearable applications. Advances in various sensing concepts and structural designs for intrinsic stretchable conductive materials as well as advanced rational platforms are discussed. In addition, the practical applications and challenges in the development of stretchable electromechanical sensors are briefly mentioned and highlighted. 相似文献
39.
Phuong H. L. Tran Dongxi Xiang Thao T. D. Tran Wang Yin Yumei Zhang Lingxue Kong Kuisheng Chen Miaomiao Sun Yong Li Yingchun Hou Yimin Zhu Wei Duan 《Advanced materials (Deerfield Beach, Fla.)》2020,32(18):1904040
Targeted exosomal delivery systems for precision nanomedicine attract wide interest across areas of molecular cell biology, pharmaceutical sciences, and nanoengineering. Exosomes are naturally derived 50–150 nm nanovesicles that play important roles in cell-to-cell and/or cell-to-tissue communications and cross-species communication. Exosomes are also a promising class of novel drug delivery vehicles owing to their ability to shield their payload from chemical and enzymatic degradations as well as to evade recognition by and subsequent removal by the immune system. Combined with a new class of affinity ligands known as aptamers or chemical antibodies, molecularly targeted exosomes are poised to become the next generation of smartly engineered nanovesicles for precision medicine. Here, recent advances in targeted exosomal delivery systems engineered by aptamer for future strategies to promote human health using this class of human-derived nanovesicles are summarized. 相似文献
40.
Hyun Wook Go Thanh Tuan Nguyen Quynh Phuong Ngo Rongrong Chu Nam Hoon Kim Joong Hee Lee 《Small (Weinheim an der Bergstrasse, Germany)》2023,19(10):2206341
Rechargeable zinc-air batteries (ZABs) are promising energy storage systems due to their low-cost and safety. However, the working principle of ZABs is based on oxygen evolution reaction (OER) and oxygen reduction reaction (ORR), which display sluggish kinetic and low stability. Herein, this work proposes a novel method to design a heterogeneous CoP/CoO electrocatalyst on mesopore nanobox carbon/carbon nanotube (CoP/CoO@MNC-CNT) that enriched active sites and synergistic effect. Moreover, the well-defined heterointerfaces could lower the energy barrier for intermediate species adsorption and promote OER and ORR electrochemical performances. The CoP/CoO@MNC-CNT electrocatalyst presents a high half-wave potential of 0.838 V for ORR and a small overpotential of 270 mV for OER. The ZABs-based CoP/CoO@MNC-CNT air-cathode shows an open-circuit voltage of 1.409 V, the long-term cycle life of 500 h with a small voltage difference change of 7.7%. Additionally, the flexible ZABs exhibit highly mechanical stability, demonstrating their application potential in wearable electronic devices. 相似文献