Chaotic motion and quasi-periodic motion are two common forms of instability in the giant magnetostrictive actuator (GMA). Therefore, in the present study we intend to investigate the influences of the system damping coefficient, system stiffness coefficient, disc spring cubic stiffness factor, and the excitation force and frequency on the output stability and the hysteresis vibration of the GMA. In this regard, the nonlinear piezomagnetic equation, Jiles–Atherton hysteresis model, quadratic domain rotation model, and the GMA structural dynamics are used to establish the mathematical model of the hysteresis vibration system of the GMA. Moreover, the multi-scale method and the singularity theory are used to determine the co-dimensional two-bifurcation characteristics of the system. Then, the output response of the system is simulated to determine the variation range of each parameter when chaos is imposed. Finally, the fourth-order Runge–Kutta method is used to obtain the time domain waveform, phase portrait and Poincaré mapping diagrams of the system. Subsequently, the obtained three graphs are analyzed. The obtained results show that when the system output is stable, the variation range of each parameter can be determined. Moreover, the stability interval of system damping coefficient, system stiffness coefficient, and the coefficient of the cubic stiffness term of the disc spring are obtained. Furthermore, the stability interval of the exciting force and the excitation frequency are determined.

Review question / Objective: The purpose of this study was to assess the efficacy of C R P f o r t h e t re a t m e n t o f O P C b y conducting a systematic meta-analysis. Condition being studied: Growing research finds cytoreductive prostatectomy has s u r v i v a l b e n e fi t f o r p a t i e n t s oligometastases.Whether cytoreductive prostatectomy (CRP) should be performed to treat oligometastatic prostate cancer

Abstract. Three degrees of freedom (3-DoF) parallel mechanism (PM) with limbs of embedding structures is a kind of PM with a coupling relationship between limbs. In order to obtain a more desirable motion, the analysis of its actuated pairs shall be conducted. However, the fact that the existence of limbs coupling results in non-unique limb group, this mechanism has multiple limb groups. In this regard, the traditional input selection theory is not suitable for direct application in the input rationality analysis. Aiming to avoid this, a general extended input selection theory and limb group selection rule are proposed. The former tackles the traditional input selection theory which is not suitable for analyzing the input of PM with limbs of embedding structures since it does not take the influence of group into consideration, whereas the latter makes the calculation of the former easier. Based on the extended input selection theory and the limb group selection rule, the input and configuration of the 3-DoF PM with limbs of embedding structures are improved.

Background: At present, controversy remains regarding whether cytoreductive prostatectomy (CRP) should be performed for oligometastatic prostate cancer (OPC). The purpose of this study was to assess the efficacy of CRP for the treatment of OPC by conducting a systematic meta-analysis .Methods: Design A systematic review and meta-analysis, conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analysis statement.Data sources Publications included in the PubMed, Embase, the Cochrane Library, EBSCO, Web of Science (SCI) databases as of May 2022.Eligibility criteria Prospective studies comparing the efficacy of RP versus no RP in the treatment of OPC.Results: In total, 11 publications incorporating 888 patients were analyzed. Tumor-reducing prostatectomy was found to have no significant effect on long-term or short-term OS [OR=2.26, 95%CI(0.97,5.28), P=0.06 > 0.05] and [OR=1.73, 95%CI(0.83,3.58), P=0.14 > 0.05], but it significantly improved patient CSS [OR=1.77, 95%CI(1.01,310.), P=0.04 < 0.05]and[OR=2.71, 95%CI(1.72,4.29), P < 0.0001] and PFS [OR=1.93, 95%CI (1.25, 2.97), P=0.003 < 0.05].Conclusion: These results suggest that cytoreductive prostatectomy can confer survival benefits to OPC patients.