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Cusp points and assembly changing motions in the PRR-PR-PRR planar parallel manipulator

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-022-0743-x

Abstract: Cusp points play an important role in the kinematic behavior.This study investigates the cusp points and assembly changing motions in a two degrees of freedom planarCusp points are then obtained by the intersection of a quadratic curve and a cubic curve.Two assembly changing motions by encircling different cusp points are highlighted, for each pair of solutions

Keywords： planar parallel manipulator assembly changing motions cusp points quartic polynomial discriminant

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Policy entry points for facilitating a transition towards a low-carbon electricity future

Frontiers of Engineering Management Pages 462-472 doi: 10.1007/s42524-022-0214-4

Abstract: the ambit of the debate on electricity transition by specifically identifying possible policy entry pointsmulti-level perspective — a prominent framework for the study of energy transition, four such entry pointsSpecific areas for policy interventions within each of these entry points have also been discussed in

Keywords： electricity transition multi-level perspective policy entry points

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Finding buckling points for nonlinear structures by dynamic relaxation scheme

Mohammad REZAIEE-PAJAND, Hossein ESTIRI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 1, Pages 23-61 doi: 10.1007/s11709-019-0549-z

Abstract: Among the finding related to the structural static path are the critical and buckling points for nonlinearIt is worth emphasizing that sign of the load factor increment changes at the load limit points.

Keywords： load factor external work dynamic relaxation static equilibrium path large displacement

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Prediction of the flash points of alkanes by group bond contribution method using artificial neural networks

PAN Yong, JIANG Juncheng, WANG Zhirong

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 4, Pages 390-394 doi: 10.1007/s11705-007-0071-z

Abstract: networks, which had the high ability of nonlinear of prediction, was established to predict the flash pointsas input parameters of neural networks to study the correlation of molecular structures with flash pointsThe results showed that the predicted flash points were in good agreement with the experimental dataThe method can be used not only to reveal the quantitative correlation between flash points and molecularstructures of alkanes but also to predict the flash points of organic compounds for chemical engineering

Keywords： information nonlinear quantitative correlation superior molecular

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The Strategic Thoughts With Spacecraft as Starting Points to Achieve Manned Space in China

Zhao Shaokui

Strategic Study of CAE 2004, Volume 6, Issue 2, Pages 8-12

Abstract:

The paper presents analysis and summary about concept research, proof of technical channels as well as the strategic thoughts on manned space development and decision making of manned space in China, and presents a deep strategic thought about the development of modern grand engineering system in China.

Keywords： manned space in China airship technical channels strategic thoughts

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A comparative study of electroacupuncture at Zhongliao (BL33) and other acupoints for overactive bladder symptoms

Likun Yang,Yang Wang,Qian Mo,Zhishun Liu

Frontiers of Medicine 2017, Volume 11, Issue 1, Pages 129-136 doi: 10.1007/s11684-016-0491-6

Abstract:

Electroacupuncture (EA) at Zhongliao (BL33) can improve the symptoms of overactive bladder (OAB), such as urinary frequency, urgency, and incontinence. However, its performance compared with other acupoints remains unclear. This study investigated the effects of EA at BL33 with deep needling on rats with OAB by detecting urodynamics in eight groups: no intervention group, D-BL33 group (deep needling at BL33), S-BL33 group (shallow needling at BL33), non-acupoint group (needling at the non-acupoint next to BL33), Weizhong (BL40) group, Sanyinjiao (SP6) group, Tongtian (BL7) group, and Hegu (LI4) group. Results revealed that EA at BL33 with deep needling, BL40, and SP6 prolonged the intercontraction interval (ICI) of rats with OAB (P=0.001, P=0.005, P=0.046, respectively, post-treatment vs. post-modeling). Furthermore, the change in ICI from post-modeling in the D-BL33 group was significantly greater than those of the no intervention and other EA groups (all P<0.01). Significantly shortened vesical micturition time (VMT) and elevated maximum detrusor pressure (MDP) were also observed in the D-BL33 group (P=0.017 and P=0.024, respectively, post-treatment vs. post-modeling). However, no statistically significant differences in the changes of VMT and MDP from post-modeling were observed between D-BL33 and the other EA groups. In conclusion, EA at BL33 with deep needling may inhibit acetic-acid-induced OAB more effectively.

Keywords： overactive bladder electroacupuncture acupuncture points

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A study for printed circuit board image registeration algorithm based on AOI

Guo Fenglin,Guan Shu′an,Kong Yan

Strategic Study of CAE 2012, Volume 14, Issue 11, Pages 103-106

Abstract: , define the sample image edge point concept according to the PCB line features, formulate the edge pointsin the view of the PCB image, propose the registration intensity evaluation based on the sample edge points

Keywords： PCB defect inspection image registration edge points sampling registration strength

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Mittag-Leffler stability analysis ofmultiple equilibrium points in impulsive fractional-order quaternion-valued Research Articles

K. UDHAYAKUMAR, R. RAKKIYAPPAN, Jin-de CAO, Xue-gang TAN

Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 2, Pages 234-246 doi: 10.1631/FITEE.1900409

Abstract: geometrical properties of activation functions and the Lipschitz condition, the existence of the equilibrium pointsIn addition, the global Mittag-Leffler stability of multiple equilibrium points for the impulsive fractional-order

Keywords： Mittag-Leffler stability Fractional-order Quaternion-valued neural networks Impulse

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Assembly variation analysis of flexible curved surfaces based on Bézier curves None

Zhen-yu LIU, Shi-en ZHOU, Jin CHENG, Chan QIU, Jian-rong TAN

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 6, Pages 796-808 doi: 10.1631/FITEE.1601619

Abstract: Most of the current variation analysis methods either neglect the relationships among feature pointson part surfaces or regard the distribution of all feature points as the same.flexible curved surface assembly when considering surface continuity through the relations between control pointsand data points.The deviations of feature points on side lines are obtained through control point distribution and are

Keywords： Assembly variation analysis Feature points Side lines Flexible curved surfaces Bézier curves