Hydrogels inevitably undergo dehydration,structural collapse,and shrinkage deformation due to the uninterrupted evaporation in the atmosphere,thereby losing their flexibility,slipperiness,and manufacturing precision.H...Hydrogels inevitably undergo dehydration,structural collapse,and shrinkage deformation due to the uninterrupted evaporation in the atmosphere,thereby losing their flexibility,slipperiness,and manufacturing precision.Here,we propose a novel bioinspired strategy to construct a spontaneously formed‘skin’on the slippery hydrogels by incorporating biological stress metabolites trehalose into the hydrogel network,which can generate robust hydrogen bonding interactions to restrain water evaporation.The contents of trehalose in hydrogel matrix can also regulate the desiccation-tolerance,mechanical properties,and lubricating performance of slippery hydrogels in a wide range.Combining vat photopolymerization three-dimensional printing and trehalose-modified slippery hydrogels enables to achieve the structural hydrogels with high resolution,shape fidelity,and sophisticated architectures,instead of structural collapse and shrinkage deformation caused by dehydration.And thus,this proposed functional hydrogel adapts to manufacture large-scale hydrogels with sophisticated architectures in a long-term process.As a proof-of-concept demonstration,a high-precision and sophisticated slippery hydrogel vascular phantom was easily fabricated to imitate guidewire intervention.Additionally,the proposed protocol is universally applicable to diverse types of hydrogel systems.This strategy opens up a versatile methodology to fabricate dry-resistant slippery hydrogel for functional structures and devices,expanding their high-precision processing and broad applications in the atmosphere.展开更多
High-frequency oscillation(HFO)of gridconnected wind power generation systems(WPGS)is one of the most critical issues in recent years that threaten the safe access of WPGS to the grid.Ensuring the WPGS can damp HFO is...High-frequency oscillation(HFO)of gridconnected wind power generation systems(WPGS)is one of the most critical issues in recent years that threaten the safe access of WPGS to the grid.Ensuring the WPGS can damp HFO is becoming more and more vital for the development of wind power.The HFO phenomenon of wind turbines under different scenarios usually has different mechanisms.Hence,engineers need to acquire the working mechanisms of the different HFO damping technologies and select the appropriate one to ensure the effective implementation of oscillation damping in practical engineering.This paper introduces the general assumptions of WPGS when analyzing HFO,systematically summarizes the reasons for the occurrence of HFO in different scenarios,deeply analyses the key points and difficulties of HFO damping under different scenarios,and then compares the technical performances of various types of HFO suppression methods to provide adequate references for engineers in the application of technology.Finally,this paper discusses possible future research difficulties in the problem of HFO,as well as the possible future trends in the demand for HFO damping.展开更多
目的:观察氟比洛芬酯联合股神经阻滞对膝关节置换手术后病人疼痛及功能恢复的作用效果。方法:选择2014年3月至2016年3月行初次单侧全膝关节置换病人共126人,分为静脉组A(42人)、阻滞组B(42人)及联合组C(42人)。静脉组病人术后留置静脉...目的:观察氟比洛芬酯联合股神经阻滞对膝关节置换手术后病人疼痛及功能恢复的作用效果。方法:选择2014年3月至2016年3月行初次单侧全膝关节置换病人共126人,分为静脉组A(42人)、阻滞组B(42人)及联合组C(42人)。静脉组病人术后留置静脉自控镇痛泵(舒芬太尼、氟比洛芬脂、盐酸恩丹西酮及生理盐水的混合液)至术后48小时拔除;阻滞组病人在术前进行股神经穿刺并留置导管,术后导管接镇痛泵(0.2%罗哌卡因),持续镇痛至术后48小时;联合组病人在进行股神经阻滞持续镇痛的同时静脉滴注氟比洛芬联合镇痛。观察指标包括:术后6、12、24、48、72小时膝关节疼痛程度(静息、活动),采用视觉模拟评分法(visual analog scale,VAS);术后48、72小时患侧膝关节活动度(Rang of motion,ROM);术后不良反应发生率。结果:在术后12、24、48小时,阻滞组的静息痛平均要小于静脉组,但大于联合组,且各组间差异有统计学意义(P<0.05);术后48、72小时的活动痛阻滞组平均要小于静脉组,但大于联合组,且差异有显著统计学意义(P<0.01);阻滞组术后48、72小时膝关节的活动度要明显大于静脉组,但小于联合组,且差异有统计学意义(P<0.05);静脉组出现副反应的比率要明显大于阻滞组及联合组,且差异有统计学意义(P<0.05)。结论:氟比洛芬酯联合股神经阻滞镇痛在围手术期临床效果明显,具有操作方便、安全性高、副作用少、利于康复练习等优点。展开更多
基金the financial support from the National Key Research and Development Program of China(2022YFB4600101)the National Natural Science Foundation of China(52175201,52005484,and 52205228)+6 种基金the Research Program of Science and Technology Department of Gansu Province(21YF5FA139 and 22JR5RA107)the Shandong Provincial Natural Science Foundation(ZR2023OE090)the Major Program(ZYFZFX-2)the Cooperation Foundation for Young Scholars(HZJJ23-02)of the Lanzhou Institute of Chemical Physics,CASthe Western Light Project,CAS(xbzg-zdsys-202007)the Taishan Scholars Programthe Oasis Scholar of Shihezi University。
文摘Hydrogels inevitably undergo dehydration,structural collapse,and shrinkage deformation due to the uninterrupted evaporation in the atmosphere,thereby losing their flexibility,slipperiness,and manufacturing precision.Here,we propose a novel bioinspired strategy to construct a spontaneously formed‘skin’on the slippery hydrogels by incorporating biological stress metabolites trehalose into the hydrogel network,which can generate robust hydrogen bonding interactions to restrain water evaporation.The contents of trehalose in hydrogel matrix can also regulate the desiccation-tolerance,mechanical properties,and lubricating performance of slippery hydrogels in a wide range.Combining vat photopolymerization three-dimensional printing and trehalose-modified slippery hydrogels enables to achieve the structural hydrogels with high resolution,shape fidelity,and sophisticated architectures,instead of structural collapse and shrinkage deformation caused by dehydration.And thus,this proposed functional hydrogel adapts to manufacture large-scale hydrogels with sophisticated architectures in a long-term process.As a proof-of-concept demonstration,a high-precision and sophisticated slippery hydrogel vascular phantom was easily fabricated to imitate guidewire intervention.Additionally,the proposed protocol is universally applicable to diverse types of hydrogel systems.This strategy opens up a versatile methodology to fabricate dry-resistant slippery hydrogel for functional structures and devices,expanding their high-precision processing and broad applications in the atmosphere.
基金This work is supported by the National Natural Science Foundation of China(No.21973100 and No.22103090)the Program for Young Outstanding Scientists of Institute of Chemistry,Chinese Academy of Science,and Beijing National Laboratory for Molecular Sciences+1 种基金Hong Gao is also supported by the K.C.Wong Education FoundationPan Jiang is supported by the China Postdoctoral Science Foundation(No.2020TQ0324).
基金supported in part by the Fundamental Research Funds for the Central Universities under Grant 2682023CX019National Natural Science Foundation of China under Grant U23B6007 and Grant 52307141Sichuan Science and Technology Program under Grant 2024NSFSC0115。
文摘High-frequency oscillation(HFO)of gridconnected wind power generation systems(WPGS)is one of the most critical issues in recent years that threaten the safe access of WPGS to the grid.Ensuring the WPGS can damp HFO is becoming more and more vital for the development of wind power.The HFO phenomenon of wind turbines under different scenarios usually has different mechanisms.Hence,engineers need to acquire the working mechanisms of the different HFO damping technologies and select the appropriate one to ensure the effective implementation of oscillation damping in practical engineering.This paper introduces the general assumptions of WPGS when analyzing HFO,systematically summarizes the reasons for the occurrence of HFO in different scenarios,deeply analyses the key points and difficulties of HFO damping under different scenarios,and then compares the technical performances of various types of HFO suppression methods to provide adequate references for engineers in the application of technology.Finally,this paper discusses possible future research difficulties in the problem of HFO,as well as the possible future trends in the demand for HFO damping.
文摘目的:观察氟比洛芬酯联合股神经阻滞对膝关节置换手术后病人疼痛及功能恢复的作用效果。方法:选择2014年3月至2016年3月行初次单侧全膝关节置换病人共126人,分为静脉组A(42人)、阻滞组B(42人)及联合组C(42人)。静脉组病人术后留置静脉自控镇痛泵(舒芬太尼、氟比洛芬脂、盐酸恩丹西酮及生理盐水的混合液)至术后48小时拔除;阻滞组病人在术前进行股神经穿刺并留置导管,术后导管接镇痛泵(0.2%罗哌卡因),持续镇痛至术后48小时;联合组病人在进行股神经阻滞持续镇痛的同时静脉滴注氟比洛芬联合镇痛。观察指标包括:术后6、12、24、48、72小时膝关节疼痛程度(静息、活动),采用视觉模拟评分法(visual analog scale,VAS);术后48、72小时患侧膝关节活动度(Rang of motion,ROM);术后不良反应发生率。结果:在术后12、24、48小时,阻滞组的静息痛平均要小于静脉组,但大于联合组,且各组间差异有统计学意义(P<0.05);术后48、72小时的活动痛阻滞组平均要小于静脉组,但大于联合组,且差异有显著统计学意义(P<0.01);阻滞组术后48、72小时膝关节的活动度要明显大于静脉组,但小于联合组,且差异有统计学意义(P<0.05);静脉组出现副反应的比率要明显大于阻滞组及联合组,且差异有统计学意义(P<0.05)。结论:氟比洛芬酯联合股神经阻滞镇痛在围手术期临床效果明显,具有操作方便、安全性高、副作用少、利于康复练习等优点。
