The development of bioinspired gradient hydrogels with self-sensing actuated capabilities for remote interaction with soft-hard robots remains a challenging endeavor. Here, we propose a novel multifunctional self-sens...The development of bioinspired gradient hydrogels with self-sensing actuated capabilities for remote interaction with soft-hard robots remains a challenging endeavor. Here, we propose a novel multifunctional self-sensing actuated gradient hydrogel that combines ultrafast actuation and high sensitivity for remote interaction with robotic hand. The gradient network structure, achieved through a wettability difference method involving the rapid precipitation of MoO_(2) nanosheets, introduces hydrophilic disparities between two sides within hydrogel. This distinctive approach bestows the hydrogel with ultrafast thermo-responsive actuation(21° s^(-1)) and enhanced photothermal efficiency(increase by 3.7 ℃ s^(-1) under 808 nm near-infrared). Moreover, the local cross-linking of sodium alginate with Ca^(2+) endows the hydrogel with programmable deformability and information display capabilities. Additionally, the hydrogel exhibits high sensitivity(gauge factor 3.94 within a wide strain range of 600%), fast response times(140 ms) and good cycling stability. Leveraging these exceptional properties, we incorporate the hydrogel into various soft actuators, including soft gripper, artificial iris, and bioinspired jellyfish, as well as wearable electronics capable of precise human motion and physiological signal detection. Furthermore, through the synergistic combination of remarkable actuation and sensitivity, we realize a self-sensing touch bioinspired tongue. Notably, by employing quantitative analysis of actuation-sensing, we realize remote interaction between soft-hard robot via the Internet of Things. The multifunctional self-sensing actuated gradient hydrogel presented in this study provides a new insight for advanced somatosensory materials, self-feedback intelligent soft robots and human–machine interactions.展开更多
This essay analyses Christopher Marlowe’s play Tamburlaine the Great and its intricate interweaving of historical events and cultural nuances.Focusing on the character of Tamburlaine,the essay explores themes of powe...This essay analyses Christopher Marlowe’s play Tamburlaine the Great and its intricate interweaving of historical events and cultural nuances.Focusing on the character of Tamburlaine,the essay explores themes of power,revenge,and divine justice within the context of the broader Shiite-Sunni conflict and the tragic history of Imam Al-Hussein.By examining Marlowe’s incorporation of historical accounts and creative narrative techniques,the essay highlights how the play provides insights into the complexities of human ambition,political manoeuvring,and the consequences of wielding authority.Ultimately,Tamburlaine the Great is shown to be a timeless exploration of the interplay between history,religion,and individual agency,inviting readers to reflect on the enduring relevance of its themes in both historical and contemporary contexts.展开更多
The frequency-dependent electrical properties and strain self-sensing behaviour of ultra-high performance concrete(UHPC)as cement-based stress/strain self-sensing(CBSS)smart materials were investigated in the frequenc...The frequency-dependent electrical properties and strain self-sensing behaviour of ultra-high performance concrete(UHPC)as cement-based stress/strain self-sensing(CBSS)smart materials were investigated in the frequency range from 100 Hz to 300 kHz.By using the electrical parameters of the equivalent electric circuit model,the quantitative relations of capacitance and conductance of CBSS with the measurement frequency were derived.The capacitance and the conductance exhibit power-law type dependence on the measurement frequency.The calculated capacitance values at frequencies beyond 2 kHz and conductance values are consistent with the experimental results.The sweep-frequency test and the fixed-frequency test were performed to examine effects of the excitation frequencies on strain self-sensing properties of CBSS.The fractional change in capacitance(FCC)and resistance(FCR)of CBSS are frequency-dependent in the frequency range from 100 Hz to the f_(B),but frequency-independent in the frequency range from the f_(B)to 300 kHz.The f_(A)and the f_(B)are 1.7-4.0 kHz and 11-78 kHz depending on the fiber dosages,respectively.FCC and FCR reach their maximum at the f_(A)and 100 Hz,respectively.The responses of capacitance and resistance of CBSS to strain show good repeatability during cyclic loading.As the fiber dosage increases,capacitance-based sensitivity to strain increases initially and then decreases at the f_(A),and resistance-based sensitivity to strain of CBSS increases with increasing fiber contents.展开更多
In the novel Tess of the D’urbervilles,Tess is successfully depicted.She is portrayed as a brave girl,hard-working,beautiful and innocent.Alec represents a brutal and destructive force,which triggers Tess’s tragedy....In the novel Tess of the D’urbervilles,Tess is successfully depicted.She is portrayed as a brave girl,hard-working,beautiful and innocent.Alec represents a brutal and destructive force,which triggers Tess’s tragedy.Angle’s inveterate old-fashioned prejudices made him relentlessly abandon Tess.Yet what Hardy tries to show is that the disintegration of rural economy in England brought about by the intrusion of capitalist relations as well as the hypocritical morality of the time are the obvious causes of Tess’s tragedy.Meanwhile,Hardy also attacks the injustice of the law.In the novel,he believes a woman is helpless in the hands of fate and Tess is trapped in the web of fate.Her tragedy is fated and inevitable.展开更多
基金The financial support from the National Natural Science Foundation of China (32201179)Guangdong Basic and Applied Basic Research Foundation (2020A1515110126 and 2021A1515010130)+1 种基金the Fundamental Research Funds for the Central Universities (N2319005)Ningbo Science and Technology Major Project (2021Z027) is gratefully acknowledged。
文摘The development of bioinspired gradient hydrogels with self-sensing actuated capabilities for remote interaction with soft-hard robots remains a challenging endeavor. Here, we propose a novel multifunctional self-sensing actuated gradient hydrogel that combines ultrafast actuation and high sensitivity for remote interaction with robotic hand. The gradient network structure, achieved through a wettability difference method involving the rapid precipitation of MoO_(2) nanosheets, introduces hydrophilic disparities between two sides within hydrogel. This distinctive approach bestows the hydrogel with ultrafast thermo-responsive actuation(21° s^(-1)) and enhanced photothermal efficiency(increase by 3.7 ℃ s^(-1) under 808 nm near-infrared). Moreover, the local cross-linking of sodium alginate with Ca^(2+) endows the hydrogel with programmable deformability and information display capabilities. Additionally, the hydrogel exhibits high sensitivity(gauge factor 3.94 within a wide strain range of 600%), fast response times(140 ms) and good cycling stability. Leveraging these exceptional properties, we incorporate the hydrogel into various soft actuators, including soft gripper, artificial iris, and bioinspired jellyfish, as well as wearable electronics capable of precise human motion and physiological signal detection. Furthermore, through the synergistic combination of remarkable actuation and sensitivity, we realize a self-sensing touch bioinspired tongue. Notably, by employing quantitative analysis of actuation-sensing, we realize remote interaction between soft-hard robot via the Internet of Things. The multifunctional self-sensing actuated gradient hydrogel presented in this study provides a new insight for advanced somatosensory materials, self-feedback intelligent soft robots and human–machine interactions.
文摘This essay analyses Christopher Marlowe’s play Tamburlaine the Great and its intricate interweaving of historical events and cultural nuances.Focusing on the character of Tamburlaine,the essay explores themes of power,revenge,and divine justice within the context of the broader Shiite-Sunni conflict and the tragic history of Imam Al-Hussein.By examining Marlowe’s incorporation of historical accounts and creative narrative techniques,the essay highlights how the play provides insights into the complexities of human ambition,political manoeuvring,and the consequences of wielding authority.Ultimately,Tamburlaine the Great is shown to be a timeless exploration of the interplay between history,religion,and individual agency,inviting readers to reflect on the enduring relevance of its themes in both historical and contemporary contexts.
文摘The frequency-dependent electrical properties and strain self-sensing behaviour of ultra-high performance concrete(UHPC)as cement-based stress/strain self-sensing(CBSS)smart materials were investigated in the frequency range from 100 Hz to 300 kHz.By using the electrical parameters of the equivalent electric circuit model,the quantitative relations of capacitance and conductance of CBSS with the measurement frequency were derived.The capacitance and the conductance exhibit power-law type dependence on the measurement frequency.The calculated capacitance values at frequencies beyond 2 kHz and conductance values are consistent with the experimental results.The sweep-frequency test and the fixed-frequency test were performed to examine effects of the excitation frequencies on strain self-sensing properties of CBSS.The fractional change in capacitance(FCC)and resistance(FCR)of CBSS are frequency-dependent in the frequency range from 100 Hz to the f_(B),but frequency-independent in the frequency range from the f_(B)to 300 kHz.The f_(A)and the f_(B)are 1.7-4.0 kHz and 11-78 kHz depending on the fiber dosages,respectively.FCC and FCR reach their maximum at the f_(A)and 100 Hz,respectively.The responses of capacitance and resistance of CBSS to strain show good repeatability during cyclic loading.As the fiber dosage increases,capacitance-based sensitivity to strain increases initially and then decreases at the f_(A),and resistance-based sensitivity to strain of CBSS increases with increasing fiber contents.
文摘In the novel Tess of the D’urbervilles,Tess is successfully depicted.She is portrayed as a brave girl,hard-working,beautiful and innocent.Alec represents a brutal and destructive force,which triggers Tess’s tragedy.Angle’s inveterate old-fashioned prejudices made him relentlessly abandon Tess.Yet what Hardy tries to show is that the disintegration of rural economy in England brought about by the intrusion of capitalist relations as well as the hypocritical morality of the time are the obvious causes of Tess’s tragedy.Meanwhile,Hardy also attacks the injustice of the law.In the novel,he believes a woman is helpless in the hands of fate and Tess is trapped in the web of fate.Her tragedy is fated and inevitable.
