Novel P/N/Si/S-containing Mononickel Complex as a Metal-based Intumescent Flame Retardant for Cotton Fabrics

Meng-Yuan Hu,Kuan-Kuan Xiong,Jian-Rong Li,Xing-Bin Jing,Pei-Hua Zhao 한국섬유공학회 2019 Fibers and polymers Vol.20 No.9

A new P/N/Si/S-containing mononickel complex NiS, which can be regarded as a rare type of the metal-basedintumescent flame retardant, has been prepared through the condensation reaction of precursor NiCl with 1, 2-ethanedithiolin the presence of triethylamine as acid-binding agent. Its molecular structure is well characterized by elemental analysis,infrared (IR) and nuclear magnetic resonance (NMR) spectroscopies. The target flame retardant NiS has been successfullyapplied to cotton fabrics through a pad-dry-cure method. Thermal degradation properties of neat and treated cotton fabricswith 10.7 wt% NiS are studied by thermogravimetric analysis (TGA). Flammability behaviors of neat and treated cotton with10.7 wt% NiS are evaluated using vertical burning test, limiting oxygen index (LOI) and microscale combustion calorimeter(MCC). Meanwhile, to further investigate the flame retardancy of NiS for cotton fabrics, the char layers of neat and treatedsamples after combustion are analyzed by SEM image and Raman spectroscopy. As a result, the improved thermal andflammability performance for cotton fabrics by introduction of NiS might be due to the metal-assisted catalytic charringeffect of NiS on the formation of the compact char layer and the release of the flammable gas.

Numerical study of hydrodynamic and thermodynamic characteristics of a heat exchanger muffler

Meng Yuan,Pingjian Ming,Wenping Zhang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11

The hydrodynamic and thermodynamic characteristics of a heat exchanger muffler (HEM), which can reduce the size of a marine engine exhaust system with waste heat recovery, were investigated using a numerical simulation method that combines the porous media model and the dual cell heat exchanger model. The effect of the thermal conductivity and dynamic viscosity of the exhaust gas on the heat transfer and pressure loss of the equipment was studied. The relationship between the heat transfer and the pressure drop of the equipment for various mass flow rates of the exhaust gas was investigated. It is shown that heat transfer conditions of the HEM could be enhanced by increasing the thermal conductivity or dynamic viscosity of the exhaust gas. To further improve the performance of the HEM, a design modification for optimizing the structure of the guide blade was proposed and numerically validated.

Design of a DSP-Based Real-Time Control Device for Railway Vehicle Simulation

Yuan Yuan,Wenjun Meng,Jisheng Hu 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.10

A real-time control device for railway vehicle simulation is designed in this study according to the experimental requirements of a railway vehicle electric traction and electric braking system. The device uses the high-speed processing characteristic of DSP and runs on the basis of both DSP and the corresponding experimental platform. The simulation experiment for a different power grade traction system is achieved through control of the device. Full static and dynamic simulation of the operating condition of the train electric traction and braking system is attained in the case of no commissioning.

SOFTWARE PERFORMANCE TESTING BASED ON LINUX KERNEL

Yuan Yuan Li,Peng Xiao,Huimin Meng 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-

Linux has created a huge new playing field for enterprises, academia, and governments. But lack and instability of applications have stopped many users from strategic, wholesale migrations to Linux. With more and more applications running on Linux system, for example mozilla fire fox, openoffice, GCC, etc. the software performance testing is becoming important on Linux platform. The kernel of an operating system has a significant impact on the overall performance of a computer system [1]. To test a software performance based on system kernel can give us a unique insight into the software, provide us useful information in determining the bottlenecks and weaknesses of the software, and thus enable us to improve it. This paper discusses the methodologies of software performance testing based on Linux kernel, which include design workload, get system parameter, time measurement and CPU utilized. We have done experiments on a computer running Linux; experiment results show that the methodologies of software performance testing based on Linux kernel is completely realizable and efficacious. Even though this paper is not intended to provide a comprehensive software test suite, the methodologies presented here can be extended to build such programs.

Herbivorous insects alter the chlorophyll metabolism of galls on host plants

Meng-Yuan Huang,Wen-Dar Huang,Hsueh-Mei Chouc,Chang-Chang Chen,Yung-Ta Chang,Chi-Ming Yang 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3

Five types of insect-induced galls derived from three host plant leaveswere analyzed for their carotenoid (Car), chlorophyll(Chl), and Chl biosynthesis porphyrins such as protoporphyrinogen IX (PPIX), magnesium protoporphyrin(MGPP) and protochlorophyllide (Pchlide), and Chl degradation intermediates including chlorophyllide (Chlide),pheophytin (Phe), pheophorbide (Pho), and phytylated and dephytylated pigments, and compared to ungalledportions of the same leaf. Galls contain significantly lower levels of Chl-related compounds (CRCs) than ungalledportions of host leaves. The mole percent of porphyrin and the ratios of Chlide/Phe and phytylated/dephytylatedpigments are both very different between galls and host leaves.We, therefore, conclude that leaf-derived gall is akind of non-leaf green tissue, that herbivorous insects alter gall Chl biosynthesis and degradation pathways, thatMg-chelatase, Mg-dechelatase, and chlorophyllase may be the major non-lethal enzymes in galls, and thatwhile ungalled host leaves take Chl → Phe → Pho and Chl → Chlide → Pho as the major and minor degradationroutes, respectively, all galls are in contrast with the host leaves.

Canonical transient receptor potential channels and their modulators: biology, pharmacology and therapeutic potentials

Yuan-Yuan Gao,Wen Tian,Hui-Nan Zhang,Yang Sun,Jing-Ru Meng,Wei Cao,Xiao-Qiang Li 대한약학회 2021 Archives of Pharmacal Research Vol.44 No.4

Canonical transient receptor potential channels(TRPCs) are nonselective, high calcium permeability cationicchannels. The TRPCs family includes TRPC1, TRPC2,TRPC3, TRPC4, TRPC5, TRPC6, and TRPC7. These channelsare widely expressed in the cardiovascular and nervoussystems and exist in many other human tissues and celltypes, playing several crucial roles in the human physiologicaland pathological processes. Hence, the emergenceof TRPCs modulators can help investigate these channels’applications in health and disease. It is worth noting that theTRPCs subfamilies have structural and functional similarities,which presents a signifi cant diffi culty in screening anddiscovering of TRPCs modulators. In the past few years,only a limited number of selective modulators of TRPCswere detected; thus, additional research on more potent andmore selective TRPCs modulators is needed. The presentreview focuses on the striking desired therapeutic eff ectsof TRPCs modulators, which provides intel on the structuralmodifi cation of TRPCs modulators and further pharmacologicalresearch. Importantly, TRPCs modulators cansignifi cantly facilitate future studies of TRPCs and TRPCsrelated diseases.

Multiparametric Functional Magnetic Resonance Imaging for Evaluating Renal Allograft Injury

Yuan Meng Yu,Qian Qian Ni,Zhen Jane Wang,Meng Lin Chen,Long Jiang Zhang 대한영상의학회 2019 Korean Journal of Radiology Vol.20 No.6

Kidney transplantation is the treatment of choice for patients with end-stage renal disease, as it extends survival and increases quality of life in these patients. However, chronic allograft injury continues to be a major problem, and leads to eventual graft loss. Early detection of allograft injury is essential for guiding appropriate intervention to delay or prevent irreversible damage. Several advanced MRI techniques can offer some important information regarding functional changes such as perfusion, diffusion, structural complexity, as well as oxygenation and fibrosis. This review highlights the potential of multiparametric MRI for noninvasive and comprehensive assessment of renal allograft injury.

The number of cecidomyiid insect galls affects the photosynthesis of Machilus thunbergii host leaves

Meng-Yuan Huang,Hsueh-Mei Chou,Yung-Ta Chang,Chi-Ming Yang 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.2

Previous studies of the impacts of galls on host leaf photosynthesis do not suggest any general trends, with a reportedrange of effects from negative to positive. In this study, photosynthetic characteristics such as chlorophyllfluorescence (Fv/Fm), photosynthetic capacity, and stomata conductancewere determined in two types of fruitlikegalls (red ovoid and green obovate galls) induced by Daphnephila taiwanensis and Daphnephila sueyenae, respectively,in order to investigate whether the number of galls affects the photosynthesis of galled leaves ofMachilus thunbergii. In 2008, chlorophyll fluorescence and photosynthetic capacity were negatively correlatedwith gall numbers, non-significantly and significantly, respectively,whereas stomata conductancewas positivelybut non-significantly correlated with gall numbers. In 2009, photosynthesis capacity and stomata conductancewere negatively, but non-significantly, correlated with gall numbers. Results imply that photosynthesis in M. thunbergii leaves is slightly affected by the number of cecidomyiid insect galls, and that the higher the gall number,the greater the negative effect that galls have on host leaf photosynthesis and subsequent infection.

Quantitative analysis of the influence of eccentricity on the thermal characteristics of in-wheel motor

Meng Yuan,Di Tan 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.2

An in-wheel motor (IWM) drive system highly integrates the drive motor, deceleration mechanism, and brake, among others, in the wheel, resulting in difficulty dissipating heat. The uneven temperature distribution of the motor is caused by its eccentricity owing to road excitation, tire bounce, and installation errors. This non-uniformity generates thermal stress that endangers motor operation and also causes the motor‘s local temperature to increase substantially, thereby affecting its performance. To solve this problem, this study takes a 15 kW IWM as research object to quantitatively analyze the temperature distribution of rated and peak conditions of the motor under different eccentricities. The influence law of eccentricity on the thermal characteristics of IWM is obtained. Results show that the eccentricity of motor has substantial influence on the temperature distribution of stator and rotor.

Fabrication of PHBV/Keratin Composite Nanofibrous Mats for Biomedical Applications

Yuan, Jiang,Xing, Zhi-Cai,Park, Suk-Woo,Geng, Jia,Kang, Inn-Kyu,Yuan, Jiang,Shen, Jian,Meng, Wan,Shim, Kyoung-Jin,Han, In-Suk,Kim, Jung-Chul The Polymer Society of Korea 2009 Macromolecular Research Vol.17 No.11

Keratin is an important protein used in wound healing and tissue recovery. In this study, keratin was modified chemically with iodoacetic acid (IAA) to enhance its solubility in organic solvent. Poly(hydroxybutylate-co-hydroxyvalerate) (PHBV) and modified keratin were dissolved in hexafluoroisopropanol (HFIP) and electrospun to produce nanofibrous mats. The resulting mats were surface-characterized by ATR-FTIR, field-emission scanning electron microscopy (FE-SEM) and electron spectroscopy for chemical analysis (ESCA). The pure m-keratin mat was cross-linked with glutaraldehyde vapor to make it insoluble in water. The biodegradation test in vitro showed that the mats could be biodegraded by PHB depolymerase and trypsin aqueous solution. The results of the cell adhesion experiment showed that the NIH 3T3 cells adhered more to the PHBV/m-keratin nanofibrous mats than the PHBV film. The BrdU assay showed that the keratin and PHBV/m-keratin nanofibrous mats could accelerate the proliferation of fibroblast cells compared to the PHBV nanofibrous mats.