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| 1 | Self-Sensing Test Method for the Temperature of Piezoelectric Stacks显示文摘A self-sensing test method for the temperature of piezoelectric stack,based on the high correlation between the static capacitance and the stack temperature,is proposed in order to construct a self-sufficient methodology of temperature measurement. Firstly,a theoretical model of static capacitance of the piezoelectric stack under preload was set up,and the influence of preload on the static capacitance was analyzed. Secondly,the correctness of the model was verified by static capacitance test experiments under various preloading conditions. Finally, the temperature measurement experiments at low-temperature stage for two kinds of piezoelectric stacks,namely the lowtemperature-resistant piezoelectric stack and conventional piezoelectric stack, were conducted under various preloading conditions using a polynomial fitting method. The results,which validate the accuracy of the test method,show that the maximum temperature deviations of the two kinds of piezoelectric stack are 3.9 ℃ and 2.8 ℃,respectively,when the preload force is close to the specified value. The test method uses the piezoelectric stack itself as a temperature sensor,which does not require additional equipment for temperature sensing,so that the space and equipment cost could be economized. And the test for static capacitance is concise and convenient,which indicates that in the cooling process,a concise and efficient test of the temperature of the piezoelectric stack could be realized so as to grasp the current temperature change in time. | SHEN Xing LI Yang LIANG Lei ZHANG Lei DAI Yuke CHEN Yuchen YANG Jinchuan | 2019 | Transactions of Nanjing University of Aeronautics and Astronautics2019，36，1： | 2 |
| 2 | Sign-reversed anomalous Nernst effect in the ferromagnetic Weyl-semimetal Fe_(3-δ)GeTe_(2): the role of Fe vacancies显示文摘Anomalous Nernst effect, as a thermal partner of anomalous Hall effect, is particularly sensitive to the Berry curvature anomaly near the Fermi level, and has been used to probe the topological nature of quantum materials. In this work, we report the observation of both effects in the ferromagnetic Weyl-semimetal Fe_(3-δ)GeTe_(2) with tunable Fe vacancies. With decreasing Fe vacancies,the anomalous Hall conductivity evolves as a function of the longitudinal conductivity from the hopping region to the region where the intrinsic Berry curvature contribution dominates. Concomitant evolutions in the anomalous Nernst signal and the anomalous off-diagonal thermoelectric coefficient are observed below the Curie temperature, displaying a unique sign change caused by the Fe vacancies. Combining these results with first-principles calculations, we argue that the Fe-vacancy concentration plays a unique role in simultaneously tuning the chemical potential and ferromagnetism, which in turn controls the Berry curvature contribution in this family of ferromagnetic topological semimetals. | Haiyang Yang Qi Wang Junwu Huang Zhouliang Wang Keqi Xia Chao Cao Mingliang Tian Zhuan Xu Jianhui Dai Yuke Li | 2022 | Science China(Physics,Mechanics & Astronomy)2022，65，11： | 0 |
| 3 | Stability analysis of layered slopes in unsaturated soils显示文摘This study presents stability analyses of layered soil slopes in unsaturated conditions and uses a limit equilibrium method to determine the factor of safety involving suction stress of unsaturated soil.One-dimensional steady infiltration and evaporation conditions are considered in the stability analyses.An example of a two-layered slope in clay and silt is selected to verify the used method by comparing with the results of other methods.Parametric analyses are conducted to explore the influences of the matric suction on the stability of layered soil slopes.The obtained results show that larger suction stress provided in unsaturated clay dominates the stability of the layered slopes.Therefore,the location and thickness of the clay layer have significant influences on slope stability.As the water level decreases,the factor of safety reduces and then increases gradually in most cases.Infiltration/evaporation can obviously affect the stability of unsaturated layered slopes,but their influences depend on the soil property and thickness of the lower soil layer. | Guangyu DAI Fei ZHANG Yuke WANG | 2022 | Frontiers of Structural and Civil Engineering2022，16，3： | 0 |
| 4 | Liver kinase B1 attenuates liver ischemia/reperfusion injury via inhibiting the NLRP3 inflammasome显示文摘Liver ischemia/reperfusion injury(IRI),a serious inflammatory response driven by innate immunity,occurs in liver surgeries such as liver resection and liver transplantation,leading to liver dysfunction,liver failure,and even rejection after transplantation.Liver kinase B1(LKB1)plays a pivotal anti-inflammatory role in IRI.One of the most important factors involved in liver IRI is the aberrant activation of the nucleotide binding oligomerization domain like receptor(NLR)family,pyrin domain-containing 3(NLRP3)inflammasome in Kupffer cells.However,the mechanisms underlying the effect of LKB1 on the NLRP3 inflammasome in liver IRI remain elusive.In this study,we found that the expression of LKB1 was decreased in liver IRI,while the NLRP3 inflammasome level was increased as shown,as revealed by RT-qPCR and western blot analysis.Furthermore,upregulation of LKB1 abrogated the expression of the NLRP3 inflammasome,which improved liver function and liver pathology in the liver IRI model in vivo.In vitro,overexpression of LKB1 inhibited the activation of NLRP3 inflammasome and nuclear factor-κB,while the inhibitory effect was reversed by silencing the expression of the forkhead box protein O1 in the RAW264.7 macrophage hypoxia/reoxygenation model.In conclusion,our results suggest that LKB1 exerts a protective effect against liver IRI by downregulating the NLRP3 inflammasome. | Jiangwen Dai Qingsong Chen Weifeng Huang Kun Shi Yuke Zhang Tingting Li Tong Mou Zuotian Huang Zhongjun Wu | 2021 | Acta Biochimica et Biophysica Sinica2021，53，5： | 0 |
| 5 | Superconductivity, electronic phase diagram, and pressure effect in Sr_(1-x)Pr_xFBiS_2显示文摘Based on a combination of X-ray diffraction, electrical transports, magnetic susceptibility, specific heat, and pressure-effect measurements, we report the results of experiments on a series of BiS_2-based Sr_(1-x)Pr_xFBiS_2 superconductors with the maximum Tcof 2.7 K for x=0.5 and at ambient pressure. Superconductivity appears only for 0.4≤x≤0.7 whereas the normal-state resistivity shows the semiconducting-like behaviors. The magnetic susceptibility χ(T) displays the low superconducting shielding volume fractions and C(T) shows no distinguishable anomaly near Tc, which suggests a filamentary superconductivity in the Pr-doped polycrystalline samples. By varying doping concentrations, an electronic phase diagram is established. Upon applying pressure on the optimally doped Sr_(0.5)Pr_(0.5)FBiS_2 system, Tcis abruptly enhanced, reaches 8.5 K at the critical pressure of P_c=1.5 GPa, and increases slightly to 9.7 K at 2.5 GPa. Accompanied by the enhancement of superconductivity from the low-to the high-Tc phases, the normal state undergoes a semiconductor-to-metal transition when under pressure. This scenario may be linked to enhanced overlap of the Bi-6 p and S-p orbitals, which contributes to the enhanced superconductivity above Pc. The pressuretemperature phase diagram for Sr_(0.5)Pr_(0.5)FBiS_2 is also presented. | Wei You Lin Li HaiYang Yang JiaLu Wang HongYing Mao Li Zhang ChuanYing Xi Jie Cheng YongKang Luo JianHui Dai YuKe Li | 2019 | Science China(Physics,Mechanics & Astronomy)2019，62，5： | 0 |
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