Pneumatic artificial muscles (PAMs) are an extensively investigated type of soft actuator. However, the PAM motions have been limited somewhat to uniaxial contraction and extension, restraining development PAMs. Given current strong interest in robotics, PAMs gaining renewed attention due their excellent compliance ease fabrication. Herein, under inspiration elephant trunk, a family bending helical extensile (HE-PAMs)/helical contractile (HC-PAMs) was proposed analyzed. Through both...

Experiments were conducted at field sites to investigate the mechanism of polygonal wear electric locomotive wheels. The rule wheels was obtained. Moreover, two on-track tests have been carried out vibration characteristics locomotive's key components. measurement results out-of-round show that most exhibit wear. main centre wavelength in 1/3 octave bands is 200 mm and/or 160 mm. test indicate dominating frequency vertical acceleration measured on axle box approximately equal passing a...

This paper presents a detailed investigation of out-of-round electric locomotive wheels through extensive measurement conducted at field sites. More than 2000 wheels, seven types locomotives widely used in China, have been measured since April 2013. The results indicate that two freight traffic suffer serious polygonal wear problems with center wavelengths ranging from 160 to 315 mm. dominating wavelength is 200 Therefore, the investigations are mainly focused on types. other types, which...

Suburban express railways have developed rapidly in China recent years. One suburban line suffered from serious interior noise issues caused by short-pitch rail corrugation. Field investigations show that corrugation occurred on different track forms. The wavelength of forms is almost the same and dominating wavelengths are 50−63 mm 1/3 octave band, corresponding to passing frequency 630 Hz band. measurements numerical simulations were carried out investigate cause results indicate localized...

Carbody hunting stability has attracted more and attention due to its great influence on the dynamic performance of a railway vehicle. To fully understand correlation between wheel–rail contact relationship carbody an electric locomotive, geometry analysis multi-body dynamics simulation are carried out in this work. The focus is influences track parameters (including rail profile, cant gauge) relationships stability. A group profiles obtained by interpolating standard CHN60 profile worn...

Abstract The development and use of architectured structures is changing the means by which we design fabricate soft robots. These materials utilize their topology geometry to control physical mechanical structural properties. We propose an structure based on trimmed helicoids that allows for independent regulation bending axial stiffness facilitates tuneability resulting robot Leveraging FEA computational analysis select a provides optimal trade-off between controllability, sensitivity...

Soft robots equipped with multifunctionalities have been increasingly needed for secure, adaptive, and autonomous functioning in unknown unpredictable environments. Robotic stacking is a promising solution to increase the functional diversity of soft robots, which are required safe human-machine interactions adapting unstructured However, most existing multifunctional limited number functions or not fully shown superiority robotic method. In this study, we present novel strategy,...

Trains crashing onto heavy road vehicles stuck across rail tracks are more likely occurrences at level crossings due to ongoing increase in the registration of and these long getting caught traffic after partly crossing boom gate; incidents lead significant financial losses societal costs. This paper presents an investigation dynamic responses trains under frontal collision on trucks obliquely crossings. study builds a nonlinear three-dimensional multi-body model passenger train colliding...

Human papillomavirus (HPV) infection may lead to a series of lesions in the cervix. Distributions HPV genotypes reveal that an increased prevalence high-risk (HR-HPV) is positively correlated with severity cervical lesions. Furthermore, persistent HR-HPV associated risk cancer. Considering newly approval vaccine China and distribution, which meaningful for directing efforts vaccination, more detailed understanding distribution critical. This study aimed investigate overall age-specific...

Soft robot are celebrated for their propensity to enable compliant and complex robot-environment interactions. robotic manipulators, or slender continuum structure robots have the potential exploit these interactions new exploration manipulation capabilities safe human-robot However, interactions, perturbations by external forces cause soft deform in an infinite degree of freedom (DOF) space. To control such system, reduced order models needed; typically consider piecewise sections constant...

Fatigue fracture of rail fastening clips is a common failure in metro. In order to clarify the prevailing factors, on-site experiments and simulations are conducted on metro line China reveal relationship between wheel–rail resonance clips. To mechanism clip installed state, vehicle–track coupled dynamics model created together with refined finite element system. Rail irregularities measured account for actual track excitations. The results show that both force displacement increase...

In the clinic, numeration of circulating tumor cells (CTCs) plays a critical role in cancer diagnosis and treatment, but conventional CTC identification counting that rely on specific antibodies to characterize cell's surface antigens are costive with limitations. Importantly, false positive or negative results may occur due high heterogeneity epithelial-mesenchymal transition (EMT) CTCs. Herein we demonstrate novel effective detecting nanoprobe could rapidly respond level endogenous H2O2...

Ferroptosis is an iron-mediated, caspase-independent pathway of cell death that accompanied with the accumulations reactive oxygen species (ROS) and oxygenases, as well being involved in many other pathophysiological procedures. However, specific rapid monitoring ferroptosis living cells or tissues has not been achieved so far. Herein, a quinoxalinone-based fluorescent probe (termed Quinos-4, QS-4) aromatic thioether moiety was designed for identification. Upon exposing it to high levels ROS...

Recent developments in soft actuation demand for resilient, responsive materials with locally varying compositions that are sufficiently stiff to exhibit significant forces. Hydrogels inherently certain stimuli. Yet, they typically suffer from a stiffness-toughness compromise such those and show adequate flexibility display limited This can be partially addressed if hydrogels formulated as double networks. However, their involved processing prevents controlled variations the local...

Robotic locomotion has shown substantial advancements, yet robots still lack the versatility and agility by animals navigating complex terrains. This limits their applicability in environments where they could be highly beneficial. Unlike existing that rely on intricate perception systems to construct models of both themselves surroundings, a more bioinspired approach leverages reconfiguration adapt robot’s morphology its environment. Although interest such multimodal, terrain-adaptive is...