水和甘油的混合溶液为液态组分,丙烯酸(AA)和N,N-二甲基丙烯酰胺(DMAA)为共聚单体,纳米氧化铝(Al2O3)为交联剂,原位自由基聚合制备了一种具有抗脱水性能的高强度纳米复合水凝胶。扫描电子显微镜表征和力学性质测试结果表明,甘油的加入...水和甘油的混合溶液为液态组分,丙烯酸(AA)和N,N-二甲基丙烯酰胺(DMAA)为共聚单体,纳米氧化铝(Al2O3)为交联剂,原位自由基聚合制备了一种具有抗脱水性能的高强度纳米复合水凝胶。扫描电子显微镜表征和力学性质测试结果表明,甘油的加入不会影响单体的聚合以及水凝胶三维网络结构的形成。当甘油质量分数从0%增加到40%时,水凝胶的拉伸强度由181. 3 k Pa增加到274. 6 k Pa;进一步增加甘油质量分数至80%,水凝胶的拉伸强度逐渐减小至113. 6 k Pa。热重分析、差示扫描量热法以及抗脱水实验研究结果显示,随着甘油含量的增加,水凝胶在空气中的水分蒸发逐渐降低,显示出优异的抗脱水性能。基于水凝胶优异的力学性质和抗脱水性能,当甘油质量分数为60%和80%时,水凝胶在空气中放置10 d依然能保持与初始制备水凝胶相当的优异力学性质。这种新型水凝胶在人工皮肤、软机器人领域有潜在的应用价值。展开更多
OBJECTIVE To explore the mechanisms of the volatiles of Wendan granule for the treatment of senile dementia,network pharmacology method integrating absorption,distribution,metab.olism,and excretion(ADME) screening,tar...OBJECTIVE To explore the mechanisms of the volatiles of Wendan granule for the treatment of senile dementia,network pharmacology method integrating absorption,distribution,metab.olism,and excretion(ADME) screening,target fishing,network constructing,pathway analyzing,and correlated diseases prediction was applied.METHODS Twelve small molecular compounds of WDG were selected as the objects from 74 volatiles with the relative abundances above 2%,and their ADME parameters were collected from Traditional Chinese Medicine Systems Pharmacology platform(TCMSP),and then the corresponding targets,genes,pathways and diseases were predicted according to the data provided by TCMSP,DrugBank,Uniport and the Database for Annotation,Visualization and Integrated Discovery(DAVID).The related pathways and correlation analysis were explored by the Kyoto Encyclo.pedia and Genomes(KEGG) database.Finally,the networks of compound-target,target-pathway and pathway-disease of WDG were constructed by Cytoscape software.RESULTS Twelve compounds interacted with 49 targets,of which top three targets were Gamma-aminobutyric acid receptor subunit alpha-1(GABRA1),Prostaglandin G/H synthase 2(PGHS-2) and Sodium-dependent noradrenaline transporter.Interestingly,these targets were highly associated with depression,insomnia and Alzheimer′s disease that mainly corresponded to mental and emotional illnesses.CONCLUSION The integrated network pharmacology method provides precise probe to illuminate the molecular mechanisms of volatiles of WDG for relieving senile dementia related syndromes,which will also facilitate the application of traditional Chinese medicine in modern medicine,as well as follow-up studies such as upgrading the quality stan.dard of clinical medicine and novel drug development.展开更多
In the modern wireless communication system,the manipulation for polarization of electromagnetic wave plays a important role in improving the capacity and reliability of communication.In this paper,a multifunctional p...In the modern wireless communication system,the manipulation for polarization of electromagnetic wave plays a important role in improving the capacity and reliability of communication.In this paper,a multifunctional polarization converter(MFPC)based on the multilayer reconfigurable metasurface is proposed,which can assist the source antenna to transmit and receive multiple polarization signals.The MFPC consists of a grating which can filter out the undesired polarization and four layers of metasurfaces incorporated with PIN diodes.The functions of the MFPC include LTC and LTL polarization conversions,co-polarization transmission and reflection for arbitrary polarization.By changing the states of PIN diodes,the functions of MFPC can be dynamically switched.Loaded on the aperture of source antenna,the proposed MFPC can serve as a transmissive array with multiple polarization channels,and can also provide EM protection for source antenna by reflecting the incoming interference waves.Cascading of the metasurfaces produces Fabry-Perot resonance in the MFPC,and it contributes to the realization of LTC and LTL polarization conversions.To verify the performance of the proposed MFPC,the prototype is fabricated and tested.The measured results show that the fractional bandwidths of four functions are all higher than 31.9% with transmission or reflection coefficients higher than-2 d B.The frequency band of each function is mainly concentrated in S-band.The measured data are in agreement with the simulated results.展开更多
An ultrawideband reflectionless metamaterial absorber(MA)is proposed by replacing the metallic ground with the complementary split-ring resonator(CSRR)structure.The proposed MA exhibits-10 d B reflectivity spectrum fr...An ultrawideband reflectionless metamaterial absorber(MA)is proposed by replacing the metallic ground with the complementary split-ring resonator(CSRR)structure.The proposed MA exhibits-10 d B reflectivity spectrum from 1 GHz to 20 GHz,which maintains more than 90%absorption from 1.5 GHz to20 GHz.Furthermore,it achieves angle stability for TE and TM polarization at oblique incident angles up to 40°and 65°,respectively.To achieve broadband absorption spectrum,we have adopted a single-layer high-impedance surface(HIS)loaded with a double-layer magnetic material(MM)structure.To further realize the RCS reduction into a lower frequency range,we have employed the scattering cancellation technology into the traditional metallic ground.Finally,we have fabricated a sample exhibiting the 10 d B RCS reduction from 1 GHz to 20 GHz with a thickness of 10 mm.Measurement and simulation results confirm that the proposed MA exhibits excellent comprehensive performance,making it suitable for many practical applications.展开更多
Recovering the low-rank structure of data matrix from sparse errors arises in the principal component pursuit （PCP）. This paper exploits the higher-order generalization of matrix recovery, named higher-order princip...Recovering the low-rank structure of data matrix from sparse errors arises in the principal component pursuit （PCP）. This paper exploits the higher-order generalization of matrix recovery, named higher-order principal component pursuit （HOPCP）, since it is critical in multi-way data analysis. Unlike the convexification （nuclear norm） for matrix rank function, the tensorial nuclear norm is stil an open problem. While existing preliminary works on the tensor completion field provide a viable way to indicate the low complexity estimate of tensor, therefore, the paper focuses on the low multi-linear rank tensor and adopt its convex relaxation to formulate the convex optimization model of HOPCP. The paper further propose two algorithms for HOPCP based on alternative minimization scheme： the augmented Lagrangian alternating direction method （ALADM） and its truncated higher-order singular value decomposition （ALADM-THOSVD） version. The former can obtain a high accuracy solution while the latter is more efficient to handle the computationally intractable problems. Experimental results on both synthetic data and real magnetic resonance imaging data show the applicability of our algorithms in high-dimensional tensor data processing.展开更多
文摘水和甘油的混合溶液为液态组分,丙烯酸(AA)和N,N-二甲基丙烯酰胺(DMAA)为共聚单体,纳米氧化铝(Al2O3)为交联剂,原位自由基聚合制备了一种具有抗脱水性能的高强度纳米复合水凝胶。扫描电子显微镜表征和力学性质测试结果表明,甘油的加入不会影响单体的聚合以及水凝胶三维网络结构的形成。当甘油质量分数从0%增加到40%时,水凝胶的拉伸强度由181. 3 k Pa增加到274. 6 k Pa;进一步增加甘油质量分数至80%,水凝胶的拉伸强度逐渐减小至113. 6 k Pa。热重分析、差示扫描量热法以及抗脱水实验研究结果显示,随着甘油含量的增加,水凝胶在空气中的水分蒸发逐渐降低,显示出优异的抗脱水性能。基于水凝胶优异的力学性质和抗脱水性能,当甘油质量分数为60%和80%时,水凝胶在空气中放置10 d依然能保持与初始制备水凝胶相当的优异力学性质。这种新型水凝胶在人工皮肤、软机器人领域有潜在的应用价值。
基金supported by Natural science foundation of Hubei(2015CFB321) Key Project of National Natural Science Foundation of China(81130064)
文摘OBJECTIVE To explore the mechanisms of the volatiles of Wendan granule for the treatment of senile dementia,network pharmacology method integrating absorption,distribution,metab.olism,and excretion(ADME) screening,target fishing,network constructing,pathway analyzing,and correlated diseases prediction was applied.METHODS Twelve small molecular compounds of WDG were selected as the objects from 74 volatiles with the relative abundances above 2%,and their ADME parameters were collected from Traditional Chinese Medicine Systems Pharmacology platform(TCMSP),and then the corresponding targets,genes,pathways and diseases were predicted according to the data provided by TCMSP,DrugBank,Uniport and the Database for Annotation,Visualization and Integrated Discovery(DAVID).The related pathways and correlation analysis were explored by the Kyoto Encyclo.pedia and Genomes(KEGG) database.Finally,the networks of compound-target,target-pathway and pathway-disease of WDG were constructed by Cytoscape software.RESULTS Twelve compounds interacted with 49 targets,of which top three targets were Gamma-aminobutyric acid receptor subunit alpha-1(GABRA1),Prostaglandin G/H synthase 2(PGHS-2) and Sodium-dependent noradrenaline transporter.Interestingly,these targets were highly associated with depression,insomnia and Alzheimer′s disease that mainly corresponded to mental and emotional illnesses.CONCLUSION The integrated network pharmacology method provides precise probe to illuminate the molecular mechanisms of volatiles of WDG for relieving senile dementia related syndromes,which will also facilitate the application of traditional Chinese medicine in modern medicine,as well as follow-up studies such as upgrading the quality stan.dard of clinical medicine and novel drug development.
基金supported in part by the Joint Funds of the National Natural Science Foundation of China(G02)(Grant No.U1834203)in part by of the Science and Technology Department of Sichuan Province(S01)(Grant No.2020JDTD0009)。
文摘In the modern wireless communication system,the manipulation for polarization of electromagnetic wave plays a important role in improving the capacity and reliability of communication.In this paper,a multifunctional polarization converter(MFPC)based on the multilayer reconfigurable metasurface is proposed,which can assist the source antenna to transmit and receive multiple polarization signals.The MFPC consists of a grating which can filter out the undesired polarization and four layers of metasurfaces incorporated with PIN diodes.The functions of the MFPC include LTC and LTL polarization conversions,co-polarization transmission and reflection for arbitrary polarization.By changing the states of PIN diodes,the functions of MFPC can be dynamically switched.Loaded on the aperture of source antenna,the proposed MFPC can serve as a transmissive array with multiple polarization channels,and can also provide EM protection for source antenna by reflecting the incoming interference waves.Cascading of the metasurfaces produces Fabry-Perot resonance in the MFPC,and it contributes to the realization of LTC and LTL polarization conversions.To verify the performance of the proposed MFPC,the prototype is fabricated and tested.The measured results show that the fractional bandwidths of four functions are all higher than 31.9% with transmission or reflection coefficients higher than-2 d B.The frequency band of each function is mainly concentrated in S-band.The measured data are in agreement with the simulated results.
文摘An ultrawideband reflectionless metamaterial absorber(MA)is proposed by replacing the metallic ground with the complementary split-ring resonator(CSRR)structure.The proposed MA exhibits-10 d B reflectivity spectrum from 1 GHz to 20 GHz,which maintains more than 90%absorption from 1.5 GHz to20 GHz.Furthermore,it achieves angle stability for TE and TM polarization at oblique incident angles up to 40°and 65°,respectively.To achieve broadband absorption spectrum,we have adopted a single-layer high-impedance surface(HIS)loaded with a double-layer magnetic material(MM)structure.To further realize the RCS reduction into a lower frequency range,we have employed the scattering cancellation technology into the traditional metallic ground.Finally,we have fabricated a sample exhibiting the 10 d B RCS reduction from 1 GHz to 20 GHz with a thickness of 10 mm.Measurement and simulation results confirm that the proposed MA exhibits excellent comprehensive performance,making it suitable for many practical applications.
基金supported by the National Natural Science Foundationof China(51275348)
文摘Recovering the low-rank structure of data matrix from sparse errors arises in the principal component pursuit （PCP）. This paper exploits the higher-order generalization of matrix recovery, named higher-order principal component pursuit （HOPCP）, since it is critical in multi-way data analysis. Unlike the convexification （nuclear norm） for matrix rank function, the tensorial nuclear norm is stil an open problem. While existing preliminary works on the tensor completion field provide a viable way to indicate the low complexity estimate of tensor, therefore, the paper focuses on the low multi-linear rank tensor and adopt its convex relaxation to formulate the convex optimization model of HOPCP. The paper further propose two algorithms for HOPCP based on alternative minimization scheme： the augmented Lagrangian alternating direction method （ALADM） and its truncated higher-order singular value decomposition （ALADM-THOSVD） version. The former can obtain a high accuracy solution while the latter is more efficient to handle the computationally intractable problems. Experimental results on both synthetic data and real magnetic resonance imaging data show the applicability of our algorithms in high-dimensional tensor data processing.
