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The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints

Shaochun WANG, Xi JIANG, Yun BAI

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 5,   Pages 1200-1213 doi: 10.1007/s11709-019-0546-2

Abstract: The hand hole acts as a weak point and initial damage in the segment joint especially when the circumferentialexperiment was conducted to study the structural performance of the segment joint with different types of handThe experiment results show that the hand hole becomes the weakest point of the segment joint under ultra-highDifferent types and sizes of the hand hole have different degree of influences on the structural behavior

Keywords： shield tunneling     structural synthetic fiber concrete     hand hole     segment joint     ultimate bearing capacity    

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Review of hand, foot and mouth disease

Lan-Juan LI MD,

Frontiers of Medicine 2010, Volume 4, Issue 2,   Pages 139-146 doi: 10.1007/s11684-010-0033-6

Abstract: Hand, foot and mouth disease (HFMD) is an acute viral illness that primarily affects infants and young

Keywords： hand     foot and mouth disease     epidemiology     pathogenesis     management     surveillance    

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Improving hole transfer of boron nitride quantum dots modified PDI for efficient photodegradation

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 11,   Pages 1718-1727 doi: 10.1007/s11705-023-2319-7

Abstract: In recent years, organic photocatalyst under visible-light absorption has shown significant potential for solving environmental problems. However, it is still a great challenge for constructing a highly active organic photocatalyst due to the low separation efficiency of photogenerated carriers. Herein, an effective and robust photocatalyst perylene-3,4,9,10-tetracarboxylic diamide/boron nitride quantum dots (PDI/BNQDs), consisting of self-assemble PDI with π–π stacking structure and BNQDs, has been constructed and researched under visible light irradiation. The PDI/BNQDs composite gradually increases organic pollutant photodegradation with the loading amount of BNQDs. With 10 mL of BNQDs solution added (PDI/BNQDs-10), the organic pollutant photodegradation performance reaches a maximum, about 6.16 times higher with methylene blue and 1.68 times higher with ciprofloxacin than that of pure PDI supramolecular. The enhancement is attributed to improved separation of photogenerated carriers from self-assembled PDI by BNQDs due to their preeminent ability to extract holes. This work is significant for the supplement of PDI supramolecular composite materials. We believe that this photocatalytic design is capable of expanding organic semiconductors’ potential for their applications in photocatalysis.

Keywords： PDI     boron nitride     quantum dots     photocatalysis     hole transfer    

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Development of a novel hand−eye calibration for intuitive control of minimally invasive surgical robot

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0698-y

Abstract: Robotic-assisted surgical system has introduced a powerful platform through dexterous instrument and handObtaining the transformation with respect to the laparoscope and robot slave arm frames using hand−eyeWe proposed a novel two-step modified dual quaternion for hand−eye calibration in this study.The dual quaternion was exploited to solve the hand−eye calibration simultaneously and powered by anThe obtained hand−eye calibration result was applied to the intuitive control by using the hand−eye coordination

Keywords： minimally invasive surgery     hand−eye calibration     intuitive control     surgical robot     dual quaternion    

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A novel shape memory alloy actuated soft gripper imitated hand behavior

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 4, doi: 10.1007/s11465-022-0700-8

Abstract: The limited length shrinkage of shape memory alloy (SMA) wire seriously limits the motion range of SMA-based gripper. In this paper, a new soft finger without silicone gel was designed based on pre bent SMA wire, and the finger was back to its original shape by heating SMA wire, rather than relying only on heat exchange with the environment. Through imitating palm movement, a structure with adjustable spacing between fingers was made using SMA spring and rigid spring. The hook structure design at the fingertip can form self-locking to further improve the load capacity of gripper. Through the long thin rod model, the relationship of the initial pre bent angle on the bending angle and output force of the finger was analyzed. The stress-strain model of SMA spring was established for the selection of rigid spring. Three grasping modes were proposed to adapt to the weight of the objects. Through the test of the gripper, it was proved that the gripper had large bending amplitude, bending force, and response rate. The design provides a new idea for the lightweight design and convenient design of soft gripper based on SMA.

Keywords： shape memory alloy (SMA)     pre bent     wire     gripper     grasping mode     lightweight    

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Fracture behavior of two non-symmetrical collinear cracks emanating from an elliptical hole in a piezoelectric

Junhong GUO, Zixing LU

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 3,   Pages 296-300 doi: 10.1007/s11465-011-0236-9

Abstract: conformal mapping, the problem of two non-symmetrical collinear cracks emanating from an elliptical holeelectric loading and anti-plane mechanical loading, which allowed us to take the electric field inside the hole

Keywords： piezoelectric materials     elliptical hole     semi-permeable crack     energy release rate     analytic solution    

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A virtual reality system for arm and hand rehabilitation

Zhiqiang LUO, Chee Kian LIM, I-Ming CHEN, Song Huat YEO

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 1,   Pages 23-32 doi: 10.1007/s11465-011-0202-6

Abstract:

This paper presents a virtual reality (VR) system for upper limb rehabilitation. The system incorporates two motion track components, the Arm Suit and the Smart Glove which are composed of a range of the optical linear encoders (OLE) and the inertial measurement units (IMU), and two interactive practice applications designed for driving users to perform the required functional and non-functional motor recovery tasks. We describe the technique details about the two motion track components and the rational to design two practice applications. The experiment results show that, compared with the marker-based tracking system, the Arm Suit can accurately track the elbow and wrist positions. The repeatability of the Smart Glove on measuring the five fingers’ movement can be satisfied. Given the low cost, high accuracy and easy installation, the system thus promises to be a valuable complement to conventional therapeutic programs offered in rehabilitation clinics and at home.

Keywords： motion tracking     rehabilitation     optical linear encoder (OLE)     virtual reality    

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characteristic evaluation and interpolation reconstruction for surface topography of drilled composite hole

Frontiers of Mechanical Engineering 2021, Volume 16, Issue 4,   Pages 840-854 doi: 10.1007/s11465-021-0643-5

Abstract: improved fractal interpolation model is proposed to reconstruct the surface topography of composite holeHole profiles in 24 directions are measured.The maximum and minimum fractal dimension of the hole wall are 1.36 and 1.07, whereas the maximum and

Keywords： surface topography     fractal evaluation     fractal interpolation     reconstruction     composite    

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Extracting hand articulations from monocular depth images using curvature scale space descriptors

Shao-fan WANG,Chun LI,De-hui KONG,Bao-cai YIN

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 1,   Pages 41-54 doi: 10.1631/FITEE.1500126

Abstract:

We propose a framework of hand articulation detection from a monocular depth image using curvatureWe extract the hand contour from an input depth image, and obtain the fingertips and finger-valleys ofExperimental results show that our method captures the hand articulations more precisely compared with

Keywords： Curvature scale space (CSS)     Hand articulation     Convex hull     Hand contour    

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Effects of Structure of Opening Hole in Gas Distributor on Detained Mass of Material for Fluidized Drying

Liu Wei,Tang Wencheng

Strategic Study of CAE 2006, Volume 8, Issue 6,   Pages 41-43

Abstract: In order to acquire the effect law of structure of opening hole in gas distributor on detained mass ofThe curves of detained mass of material for drier with vertical-hole distributor and tithed-hole distributorBased on the result, the relationship data of drier with tilted-hole distributor were determined betweenthe production capacity and the hole ratio of distributor.In addition, changing the hole shape of distributor from vertical-hole to tilted-hole and adding the

Keywords： inert particles     fluidized drying     gas distributor     hole shape     hole ratio     detained mass of material    

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Function-oriented optimization design method for underactuated tendon-driven humanoid prosthetic hand

Frontiers of Mechanical Engineering 2022, Volume 17, Issue 3, doi: 10.1007/s11465-022-0696-0

Abstract: The loss of hand functions in upper limb amputees severely restricts their mobility in daily life.Wearing a humanoid prosthetic hand would be an effective way of restoring lost hand functions.In a prosthetic hand design, replicating the natural and dexterous grasping functions with a few actuatorsoptimization design (FOD) method is proposed for the design of a tendon-driven humanoid prosthetic hand

Keywords： function-oriented     tendon driven     prosthetic hand     optimization     humanoid     underactuated    

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Superunderactuated Multifingered Hand for Humanoid Robot

ZHANG Wen-zeng, CHEN Qiang, SUN Zhen-guo, XU Lei

Frontiers of Mechanical Engineering 2006, Volume 1, Issue 1,   Pages 33-39 doi: 10.1007/s11465-005-0015-6

Abstract: Finger mechanism was incorporated into a humanoid robot hand to obtain more degrees of freedom with lessA novel superunderactuated multifingered hand (TH-2 Hand) for a humanoid robot was designed based onThe TH-2 Hand was attached to a humanoid robot because of its high personification, superunderactuation

Keywords： control     real-time control     superunderactuation     TH-2     personification    

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Hole quality in longitudinal–torsional coupled ultrasonic vibration assisted drilling of carbon fiber

Guofeng MA, Renke KANG, Zhigang DONG, Sen YIN, Yan BAO, Dongming GUO

Frontiers of Mechanical Engineering 2020, Volume 15, Issue 4,   Pages 538-546 doi: 10.1007/s11465-020-0598-y

Abstract: characteristics, CFRP composites are considered difficult-to-cut materials and are prone to generating serious holeFurthermore, LTC-UAD can decrease the delamination and burr factors and improve the surface quality of the hole

Keywords： longitudinal–torsional coupled     ultrasonically drilling     CFRP     thrust force     hole quality    

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SAP30-2:1 is downregulated in congenital heart disease and regulates cell proliferation by targeting HAND2

Jing Ma, Shiyu Chen, Lili Hao, Wei Sheng, Weicheng Chen, Xiaojing Ma, Bowen Zhang, Duan Ma, Guoying Huang

Frontiers of Medicine 2021, Volume 15, Issue 1,   Pages 91-100 doi: 10.1007/s11684-020-0778-5

Abstract: kidney and AC16 cells and decreased the expression of heart and neural crest derivatives expressed 2 (HAND2Moreover, lncRNA SAP30-2:1 was associated with HAND2 by RNA immunoprecipitation.lncRNA SAP30-2:1 may be involved in heart development through affecting cell proliferation via targeting HAND2

Keywords： congenital heart disease     Gene Expression Omnibus     lncRNA SAP30-2:1     cell proliferation     RNA immunoprecipitation     HAND2    

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Blasting Technologies of Decreasing Vibration in Subway Tunnel Underpass Adjacent Upper Buildings

Fang Junbo

Strategic Study of CAE 2014, Volume 16, Issue 11,   Pages 58-64

Abstract: , in order to insure the safety of the upper buildings, technologies of parallel cut with big empty hole

Keywords： blasting design     parallel cut     big empty hole     delay- time initiation     short- hole blasting    

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Title Author Date Type Operation

The influence of hand hole on the ultimate strength and crack pattern of shield tunnel segment joints

Shaochun WANG, Xi JIANG, Yun BAI

Journal Article

Review of hand, foot and mouth disease

Lan-Juan LI MD,

Journal Article

Improving hole transfer of boron nitride quantum dots modified PDI for efficient photodegradation

Journal Article

Development of a novel hand−eye calibration for intuitive control of minimally invasive surgical robot

Journal Article

A novel shape memory alloy actuated soft gripper imitated hand behavior

Journal Article

Fracture behavior of two non-symmetrical collinear cracks emanating from an elliptical hole in a piezoelectric

Junhong GUO, Zixing LU

Journal Article

A virtual reality system for arm and hand rehabilitation

Zhiqiang LUO, Chee Kian LIM, I-Ming CHEN, Song Huat YEO

Journal Article

characteristic evaluation and interpolation reconstruction for surface topography of drilled composite hole

Journal Article

Extracting hand articulations from monocular depth images using curvature scale space descriptors

Shao-fan WANG,Chun LI,De-hui KONG,Bao-cai YIN

Journal Article

Effects of Structure of Opening Hole in Gas Distributor on Detained Mass of Material for Fluidized Drying

Liu Wei,Tang Wencheng

Journal Article

Function-oriented optimization design method for underactuated tendon-driven humanoid prosthetic hand

Journal Article

Superunderactuated Multifingered Hand for Humanoid Robot

ZHANG Wen-zeng, CHEN Qiang, SUN Zhen-guo, XU Lei

Journal Article

Hole quality in longitudinal–torsional coupled ultrasonic vibration assisted drilling of carbon fiber

Guofeng MA, Renke KANG, Zhigang DONG, Sen YIN, Yan BAO, Dongming GUO

Journal Article

SAP30-2:1 is downregulated in congenital heart disease and regulates cell proliferation by targeting HAND2

Jing Ma, Shiyu Chen, Lili Hao, Wei Sheng, Weicheng Chen, Xiaojing Ma, Bowen Zhang, Duan Ma, Guoying Huang

Journal Article

Blasting Technologies of Decreasing Vibration in Subway Tunnel Underpass Adjacent Upper Buildings

Fang Junbo

Journal Article