Compared with the traditional rigid robots, the continuum robot has been widely studied because of its advantages of compact design and flexible motion. The design of continuum parallel robots are similar to that of t...
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In order to meet the requirements of keeping the body posture level with the ground during the movement of the quadruped robots, this paper designs a quadruped robot with three joints and three degrees of freedom in e...
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Secure and high-speed optical communications are of primary focus in information *** it is widely accepted that chaotic secure communication can provide superior physical layer security,it is challenging to meet the d...
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Secure and high-speed optical communications are of primary focus in information *** it is widely accepted that chaotic secure communication can provide superior physical layer security,it is challenging to meet the demand for high-speed increasing communication *** theoretically propose and experimentally demonstrate a conceptual paradigm for orbital angular momentum(OAM)configured chaotic laser(OAM-CCL)that allows access to high-security and massivecapacity optical *** 11 OAM modes and an all-optical feedback chaotic laser,we are able to theoretically empower a well-defined optical communication system with a total transmission capacity of 100 Gb∕s and a bit error rate below the forward error correction threshold 3.8×10^(-3).Furthermore,the OAM-CCL-based communication system is robust to 3D misalignment by resorting to appropriate mode spacing and beam ***,the conceptual paradigm of the OAM-CCL-based communication system is *** contrast to existing systems(traditional free-space optical communication or chaotic optical communication),the OAM-CCL-based communication system has threein-one characteristics of high security,massive capacity,and *** findings demonstrate that this will promote the applicable settings of chaotic laser and provide an alternative promising route to guide high-security and massive-capacity optical communications.
With the expansion of application scenarios, the walking-assisted lower-limb exoskeleton robot urgently needs to improve its walking ability in complex terrains. However, due to the lack of environmental understanding...
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Industrial robots are widely used in industrial production because of their high work efficiency and high flexibility, but their low tracking accuracy makes them unable to be applied on a large scale in high-precision...
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The stability of perovskite solar cells （PSCs） is a major problem limiting their ***,we proposed a feasible solution using bis（2,2,6,6-tetramethyl-4-piperidyl） sebacate（HALS-770） as top protection layer of ***-7...
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The stability of perovskite solar cells （PSCs） is a major problem limiting their ***,we proposed a feasible solution using bis（2,2,6,6-tetramethyl-4-piperidyl） sebacate（HALS-770） as top protection layer of ***-770 interlayer can not only improve the antioxidant ability of perovskite by removing superoxide (O) with help of hindered amine groups,but also suppress the internal and external degradation path of perovskite due to the co-existence of hydrophilic and hydrophobic ***,it can block volatilization of organic cation and the migration of Agand I,thus improve thermal stability of perovskite and alleviate destruction of Ag *** addition,the heterocycles N atom and carbonyl group in HALS-770 interact with the under-coordinated Pb,reducing the interface *** a result,the unencapsulated device maintains excellent stability over95%of its initial efficiency after 30 days in ambient condition with about 25–50%humidity,and possesses remarkable continuous operation stability with projected T80>1400 h at maximum power point tracking in glove box,much higher than those of the pristine ***,HALS-770 enable the PCE of 21.88%for PSC （0.06 cm）,which is among the highest efficiencies for MAPbI based PSCs with p-i-n structure,and the PCE of 19.07%for PSM （4 cm）.And it is also suitable for FAMA-based devices with n-i-p structure,enabling an efficiency of 23.03%（0.06 cm） and excellent stability.
To address abnormal situations such as packaging damage, liquid leakage, and item displacement during logistics package transportation, this paper introduces Convolutional Neural Network (CNN) and image recognition te...
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The expeditious progress of information technology has encouraged the digital enhancement of the educational sector. To remedy the issues of the traditional teaching mode, a blended teaching mode of engineering drawin...
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Optical chaos communication and key distribution have been extensively demonstrated with high-speed advantage but only within the metropolitan-area network range of which the transmission distance is restricted to aro...
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Optical chaos communication and key distribution have been extensively demonstrated with high-speed advantage but only within the metropolitan-area network range of which the transmission distance is restricted to around 300 *** secure-transmission requirement of the backbone fiber link,the critical threshold is to realize long-reach chaos ***,we propose and demonstrate a scheme of long-reach chaos synchronization using fiber relay transmission with hybrid amplification of an erbium-doped fiber amplifier(EDFA)and a distributed fiber Raman amplifier(DFRA).Experiments and simulations show that the hybrid amplification extends the chaos-fidelity transmission distance thanks to that the low-noise DFRA suppresses the amplified spontaneous emission noise and self-phase *** of the hybrid-relay conditions are studied,including launching power,gain ratio of DFRA to EDFA,single-span fiber length,and number of fiber span.A 1040-km chaos synchronization with a synchronization coefficient beyond 0.90 is experimentally achieved,which underlies the backbone network-oriented optical chaos communication and key distribution.
Simultaneously guiding electromagnetic waves and heat flow at any incidence angle to smoothly bypass some electromagnetic/thermal sensitive elements is a key factor to ensure efficient communication and thermal protec...
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