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您的检索式：作者名="Zhifang Ju"
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| 1 | Ultra-low thermal conductivity of two-dimensional phononic crystals in the incoherent regime显示文摘Two-dimensional silicon phononic crystals have attracted extensive research interest for thermoelectric applications due to their reproducible low thermal conductivity and sufficiently good electrical properties.For thermoelectric devices in high-temperature environment,the coherent phonon interference is strongly suppressed;therefore phonon transport in the incoherent regime is critically important for manipulating their thermal conductivity.On the basis of perturbation theory,we present herein a novel phonon scattering process from the perspective of bond order imperfections in the surface skin of nanostructures.We incorporate this strongly frequency-dependent scattering rate into the phonon Boltzmann transport equation and reproduce the ultra low thermal conductivity of holey silicon nanostructures.We reveal that the remarkable reduction of thermal conductivity originates not only from the impediment of low-frequency phonons by normal boundary scattering,but also from the severe suppression of high-frequency phonons by surface bond order imperfections scattering.Our theory not only reveals the role of the holey surface on the phonon transport,but also provide a computation tool for thermal conductivity modification in nanostructures through surface engineering. | Guofeng Xie Zhifang Ju Kuikui Zhou Xiaolin Wei Zhixin Guo Yongqing Cai Gang Zhang | 2018 | npj Computational Materials2018，，1： | 2 |
| 2 | Evaluation of the intracellular lipid-lowering effect of polyphenols extract from highland barley in HepG2 cells显示文摘Active ingredients from highland barley have received considerable attention as natural products for developing treatments and dietary supplements against obesity.In practical application,the research of food combinations is more significant than a specific food component.This study investigated the lipid-lowering effect of highland barley polyphenols via lipase assay in vitro and HepG2 cells induced by oleic acid(OA).Five indexes,triglyceride(TG),total cholesterol(T-CHO),low density lipoprotein-cholesterol(LDL-C),aspartate aminotransferase(AST),and alanine aminotransferase(ALT),were used to evaluate the lipidlowering effect of highland barley extract.We also preliminary studied the lipid-lowering mechanism by Realtime fluorescent quantitative polymerase chain reaction(q PCR).The results indicated that highland barley extract contains many components with lipid-lowering effects,such as hyperoside and scoparone.In vitro,the lipase assay showed an 18.4%lipase inhibition rate when the additive contents of highland barley extract were 100μg/m L.The intracellular lipid-lowering effect of highland barley extract was examined using 0.25 mmol/L OA-induced HepG2 cells.The results showed that intracellular TG,LDL-C,and T-CHO content decreased by 34.4%,51.2%,and 18.4%,respectively.ALT and AST decreased by 51.6%and 20.7%compared with the untreated hyperlipidemic HepG2 cells.q PCR results showed that highland barley polyphenols could up-regulation the expression of lipid metabolism-related genes such as PPARγand Fabp4. | Yijun Yao Zhifang Li Bowen Qin Xingrong Ju Lifeng Wang | 2024 | Food Science and Human Wellness2024，13，1： | 1 |
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