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Effect of Microwave Power and Clamping Pressure on the Microwave Welding of Polypropylene Using Silicon Carbide Nanowhiskers as Microwave Susceptor

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Chinese Journal of Polymer Science 2022年第11期40卷 1466-1481页

作者： phey yee foong Chun Hong Voon Bee Ying Lim Pei Leng Teh Mohd Afendi Bin Rojan Nor Azizah Parmin Subash C.B.Gopinath Mohd Khairuddin Md Arshad Foo Wah Low Savisha Mahalingam Abreeza Manap Ruslinda A.Rahim Uda Hashim Institute of Nano Electronic Engineering Universiti Malaysia PerlisSeriabKangarPerlis01000Malaysia Faculty of Chemical Engineering Technology Universiti Malaysia PerlisJejawiPerlis Arau02600Malaysia Faculty of Mechanical Engineering Technology Universiti Malaysia PerlisPauhPerlis Arau02600Malaysia Department of Electrical&Electronic Engineering Lee Kong Chian Faculty of Engineering&ScienceUniversiti Tunku Abdul RahmanBandar Sungai LongKajangSelangor43000Malaysia Institute of Sustainable Energy Universiti Tenaga NasionalJalan IKRAM-UNITENKajangSelangor43000Malaysia

Due to their excellent dielectric properties and the rapid response to microwave irradiation,silicon carbide nanowhiskers(SiCNWs)were employed as microwave susceptor in this study to absorb microwave and locally melt the surrounding polypropylene(PP)substrates for the joining of PP *** welded joint is formed after the melted PP was cooled and *** than microwave susceptor,SiCNWs also acted as the nanofillers in strengthening the welded joint through the formation of SiCNWs reinforced PP nanocomposite at the interface of PP ***,the effect of microwave power on the microwave welding of PP substrates using SiCNWs as susceptor was studied and *** was found that the tensile strength and modulus of elasticity of the welded joint improved as microwave power ***,it deteriorates the flexibility of the welded joint as high stiffness SiCNWs were incorporated deeper into the PP matrix which restricted the PP chain *** from microwave power,clamping pressure is also critical in determining the mechanical properties of a welded *** compared to unclamped welded joint,the tensile strength,modulus of elasticity and flexibility of welded joint subjected to clamping pressure improved ***,the tensile strength of welded joint increased when the clamping pressure was increased from P1 to P3,but decreased when the clamping pressure was further increased to P4 due to the occurrence of flashing at welded *** formation mechanism of SiCNWs reinforced PP welded joint was also proposed in this *** to conventional welding,this welding process is easy,straightforward and is able to produce welded joint with outstanding mechanical properties via precise controlling of the processing ***,microwave welding is thought to offer an option for the joining of thermoplastics and other applications.

关键词： Microwave welding Silicon carbide Nanowhiskers Joining Susceptor

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Osteoblastic glucocorticoid signaling exacerbates high-fat-diet-induced bone loss and obesity

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Bone Research 2021年第4期9卷 537-548页

作者： Sarah Kim Holger Henneicke Lauryn L.Cavanagh Eugenie Macfarlane Lee Joanne Thai Daphne foong Sylvia J.Gasparini Colette Fong-yee Michael M.Swarbrick Markus J.Seibel Hong Zhou Bone Research Program ANZAC Research InstituteThe University of SydneySydneyNSWAustralia Concord Clinical School The University of SydneySydneyNSWAustralia Department of MedicineⅢ Technische University Dresden Medical CenterDresdenGermany Center for Healthy Aging Technische Universitat Dresden Medical CenterDresdenGermany Center for Regenerative Therapies Dresden Technische University DresdenDresdenGermany Department of Endocrinology and Metabolism Concord Repatriation General HospitalThe University of SydneySydneyNSWAustralia

Chronic high-fat diet(HFD)consumption not only promotes obesity and insulin resistance,but also causes bone loss through mechanisms that are not well ***,we fed wild-type CD-1 mice either chow or a HFD(43%of energy from fat)for 18 weeks;HFD-fed mice exhibited decreased trabecular volume(-28%)and cortical thickness(-14%)compared to chow-fed *** HFD-fed mice,bone loss was due to reduced bone formation and mineral apposition,without obvious effects on bone *** feeding also increased skeletal expression of sclerostin and caused deterioration of the osteocyte lacunocanalicular network(LCN).In mice fed HFD,skeletal glucocorticoid signaling was activated relative to chow-fed mice,independent of serum corticosterone *** therefore examined whether skeletal glucocorticoid signaling was necessary for HFD-induced bone loss,using transgenic mice lacking glucocorticoid signaling in osteoblasts and osteocytes(HSD2^(OB/OCY)-tg mice).In HSD2^(OB/OCY)-tg mice,bone formation and mineral apposition rates were not suppressed by HFD,and bone loss was significantly ***,in HSD2^(OB/OCY)-tg mice fed HFD,both Wnt signaling(less sclerostin induction,increased P

关键词： glucocorticoid obesity matched

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