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Journal articles on the topic 'Open-loop synthesis'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 July 2025

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1

Chan, Jenq-Tzong H. "Control System Synthesis Based on Plant Test Data." Journal of Dynamic Systems, Measurement, and Control 117, no. 4 (1995): 484–89. http://dx.doi.org/10.1115/1.2801104.

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A correlation equation is established between open-loop test data and the desired closed-loop system characteristics permitting control system synthesis to be done on the basis of a numerical approach using experimental data. The method is applicable when the system is linear-time-invariant and open-loop stable. The major merits of the algorithm are two-fold: 1) Arbitrary placement of the closed-loop system equation is possible, and 2) explicit knowledge of an open-loop system model is not needed for the controller synthesis.

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2

Chan, Jenq-Tzong H. "Model-Matching Controller Design With Input-Output Data—A Numerical Approach for Redundantly Actuated Systems." Journal of Dynamic Systems, Measurement, and Control 116, no. 4 (1994): 800–805. http://dx.doi.org/10.1115/1.2899283.

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A numerical technique for control system synthesis based on input-output data is presented. The method is applicable when the system is open-loop stable and redundantly actuated. The major merits of the method are as follows. First, the closed-loop system equation may be arbitrarily assigned. Second, explicit knowledge of an open-loop system model is not needed for controller synthesis. Third, the stability of the synthesized system may be verified during the synthesis process; hence, the workability of the controller is ensured.

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3

Xu, Yashan. "Existence and uniqueness of constrained globally optimal feedback controls in a linear-quadratic framework." Journal of Applied Mathematics and Stochastic Analysis 2006 (July 25, 2006): 1–22. http://dx.doi.org/10.1155/jamsa/2006/41926.

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A constrained closed-loop optimal control problem is considered in a linear-quadratic framework. To solve the problem, a special type open-loop optimal control problem and a standard open-loop optimal control problem are introduced and carefully studied, via which the existence and uniqueness of the globally optimal closed-loop control is established by a synthesis method.

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4

Lazarević, Mihailo, Nikola Živković, and Darko Radojević. "Open-closed Iterative Learning Control Algorithm for Exoskeleton Rehabilitation Purposes." MATEC Web of Conferences 292 (2019): 01010. http://dx.doi.org/10.1051/matecconf/201929201010.

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The paper designs an appropriate iterative learning control (ILC) algorithm based on the trajectory characteristics of upper exosk el eton robotic system. The procedure of mathematical modelling of an exoskeleton system for rehabilitation is given and synthesis of a control law with two loops. First (inner) loop represents exact linearization of a given system, and the second (outer) loop is synthesis of a iterative learning control law which consists of two loops, open and closed loop. In open loop ILC sgnPDD2 is applied, while in feedback classical PD control law is used. Finally, a simulati

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Chan, Jenq-Tzong H. "Synthesis of Multivariable Controller With Plant Test Data." Journal of Dynamic Systems, Measurement, and Control 116, no. 2 (1994): 309–13. http://dx.doi.org/10.1115/1.2899225.

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A method to synthesize decoupled multivariable control system from a batch of plant test data is introduced. The method is applicable when the system has more inputs than outputs and is open-loop stable. An advantage of this method is that explicit identification of an open-loop system model is not required for controller synthesis.

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6

WANG, XIAO FAN, M. DI BERNARDO, D. P. STOTEN, M. H. LOWENBERG, and G. CHARLES. "BIFURCATION TAILORING VIA NEWTON FLOW-AIDED ADAPTIVE CONTROL." International Journal of Bifurcation and Chaos 13, no. 03 (2003): 677–84. http://dx.doi.org/10.1142/s021812740300690x.

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The aim of bifurcation tailoring is to design an appropriate control law such that the controlled system has a desired bifurcation diagram. After describing two open-loop bifurcation tailoring techniques, this paper proposes a new open-loop plus close-loop bifurcation tailoring method based on a combination of the Newton-flow algorithm and the minimal control synthesis (MCS) adaptive control strategy. This method is applied to the Duffing system as an illustrative example.

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7

Sandor, George N., Yongxian Xu, and Tzu-Chen Weng. "On the elimination of branching in the synthesis of spatial single-loop mechanisms with lower pairs." Robotica 6, no. 2 (1988): 149–54. http://dx.doi.org/10.1017/s0263574700003969.

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SUMMARYA single-loop spatial mechanism kinematically becomes an open robot, if we separate the grounded joint of the input link which may then be considered as the end effector of the robot. Any position of the end-effector within the workspace of such an open robot can be reached via a number of different configurations of the links. These configurations are called “branches” of the open robot for that particular position of the end effector.If the open robot is now stretched to a limiting position by a force exerted on the end effector, all the possible branches of the mechanism approach eac

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8

Li, S. C., and A. Nassirharand. "Non-linear proportional–integral–derivative synthesis for unstable non-linear systems using describing function inversion with experimental verification." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 226, no. 2 (2011): 145–53. http://dx.doi.org/10.1177/0959651811417767.

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This paper demonstrates a new non-linear proportional–integral–derivative (PID) controller synthesis approach using a describing function inversion technique for unstable systems where a mathematical model may not be available. The approach is applied to an inverted pendulum experimental set-up whose dynamic behaviour is very sensitive to the amplitude level of excitation. The procedure involves stabilization of the unstable system followed by generation of the describing function models of the stabilized closed-loop system. Then, the corresponding unstable open-loop frequency domain models at

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9

Araque, Juan Gabriel, Luis Angel, Jairo Viola, and Yangquan Chen. "Design and Implementation of a Recursive Feedforward-Based Virtual Reference Feedback Tuning (VRFT) Controller for Temperature Uniformity Control Applications." Machines 11, no. 10 (2023): 975. http://dx.doi.org/10.3390/machines11100975.

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Data-driven controller synthesis methods use input/output information to find the coefficients of a proposed control architecture. Virtual Reference Feedback Tuning (VRFT) is one of the most popular frameworks due to its simplicity and one-shoot synthesis style based on open-loop system response for classic regulators such as PI or PID. This paper presents a recursive VRFT framework to extend VRFT into high-order controllers with more complex structures. The framework first defines a reference model and controller structure, then uses the open-loop data to compute the virtual reference and err

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Long, Yifu, Xi Wang та Jiashuai Liu. "A Hybrid Open/Closed-Loop μ Control Method for Achieving Consistent Transient Performance in Turbofan Engines". Actuators 13, № 12 (2024): 531. https://doi.org/10.3390/act13120531.

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The inconsistency in acceleration and deceleration performance between high and low altitudes is a significant challenge in aircraft engine control today. In the past, neither open-loop fuel–air ratio control nor closed-loop N-dot control could resolve this issue perfectly; the difference in acceleration and deceleration performance between high and low altitudes is even more than three times. The operational characteristics of aircraft engines vary significantly between high and low altitudes, posing challenges for transient state control in high-performance aircraft engines. To address these

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11

Bhat, S. P., and D. K. Miu. "Experiments on Point-to-Point Control of a Flexible Beam Using Laplace Transform Technique: Part II—Closed-Loop." Journal of Dynamic Systems, Measurement, and Control 113, no. 3 (1991): 438–43. http://dx.doi.org/10.1115/1.2896429.

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Using the Laplace domain synthesis technique documented in earlier publications, experiments on the closed-loop point-to-point position control of a flexible beam are presented. Two different approaches are described, a feed-forward control and an iterative open-loop control. Solution to the robustness problems encountered during actual implementation is also demonstrated.

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12

Zhang, Lijun, Chunmei Yu, Shifeng Zhang, and Hong Cai. "Optimal attitude trajectory planning method for CMG actuated spacecraft." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, no. 1 (2017): 131–42. http://dx.doi.org/10.1177/0954410016687596.

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This paper presents an optimal attitude trajectory planning method for the spacecraft equipped with control moment gyros as the actuators. Both the fixed-time energy-optimal and synthesis performance optimal cases are taken into account. The corresponding nonsingular attitude maneuvering trajectories (i.e. open-loop control trajectories) with the consideration of a series of constraints are generated via Radau pseudospectral method. Compared with the traditional steering laws, the optimal steering law designed by this method can explicitly avoid the singularity from the global perspective. A l

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13

Ran, Maopeng, Qing Wang, Chaoyang Dong, and Maolin Ni. "Simultaneous multi-stage anti-windup synthesis for open-loop stable plants." Transactions of the Institute of Measurement and Control 37, no. 4 (2014): 560–68. http://dx.doi.org/10.1177/0142331214549092.

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14

Huang, H. P., and C. C. Chen. "Control-system synthesis for open-loop unstable process with time delay." IEE Proceedings - Control Theory and Applications 144, no. 4 (1997): 334–46. http://dx.doi.org/10.1049/ip-cta:19971222.

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Buttini, T. M., and R. Nicoletti. "PD controller synthesis from open-loop response measurements of rotating system." IET Control Theory & Applications 6, no. 14 (2012): 2209–15. http://dx.doi.org/10.1049/iet-cta.2011.0782.

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Qu, Haibo, Yuefa Fang, and Sheng Guo. "Structural synthesis of a class of 3-DOF wrist mechanisms with redundantly-actuated closed-loop units." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 2 (2015): 276–90. http://dx.doi.org/10.1177/0954406215573039.

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In this paper, a new method is proposed for the structural synthesis of a class of redundantly-actuated parallel wrists (RaPWs) with three rotational degrees of freedom of the moving platform and symmetrical structures based on screw theory. First, the new procedure for structural synthesis of RaPWs with closed-loop actuated unit is proposed and the constraint system of the moving platform of RaPWs is analyzed. Then, considering the inclusion relation between the primary constraint system and the limb constraint system, the type of kinematic limb is determined. The synthesis of type-1 and type

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17

Bouafoura, Mohamed Karim, and Naceur Benhadj Braiek. "Suboptimal control synthesis for state and input delayed quadratic systems." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 236, no. 5 (2022): 944–56. http://dx.doi.org/10.1177/09596518211067476.

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In this article a suboptimal linear-state feedback controller for multi-delay quadratic system is investigated. Optimal state and input coefficients resulting from the expansion over a hybrid basis of block pulse and Legendre polynomials are first obtained by formulating a nonlinear programming problem. Afterwards, suboptimal control gains are found by solving a least square problem constructed with optimal coefficients of the open loop study. A sufficient condition for the exponential stability of the closed loop is obtained from generalized Grönwall–Bellman lemma. The Van de Vusse chemical r

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18

Mystkowski, Arkadiusz. "Sensitivity and Stability Analysis of Mu-Synthesis AMB Flexible Rotor." Solid State Phenomena 164 (June 2010): 313–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.164.313.

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The paper presents the sensitivity and stability margin analyses of the flexible rotor supported by active magnetic bearings (AMBs) with the robust optimal vibrations control. The modal representation of the rotor finite element model (FEM) is investigated. Then, the open-loop system of the AMBs flexible rotor is established and critical speed analysis due to variation of bearing stiffness is performed. For the open-loop setup, the non-collocation effect of displacement sensors and magnetic actuators due to control stability problem is considered. The frequency mode analysis of the collocation

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19

Mason, Melanie A., Anne C. Russ, Ryan T. Tierney, and Jamie L. Mansell. "The Effect of the Closed-Loop Control System on Blood Glucose Control With Exercise: A Critically Appraised Topic." International Journal of Athletic Therapy and Training 26, no. 5 (2021): 241–44. http://dx.doi.org/10.1123/ijatt.2020-0109.

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Context: Exercise can cause fluctuations in blood glucose control in type 1 diabetics. For athletes with type 1 diabetes, maintenance of blood glucose within an ideal range may be difficult. Objective: To determine, in individuals with type 1 diabetes, the effectiveness of the closed loop control system versus the open loop control system in keeping blood glucose levels in the ideal range with exercise. Data Sources: A search of PubMed was conducted in June of 2020 using the Boolean phrases: (closed loop control system OR artificial pancreas) AND type 1 diabetes AND exercise AND ideal range AN

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20

Knospe, C. R., S. M. Tamer, and S. J. Fedigan. "Synthesis of Robust Gain Matrices for Adaptive Rotor Vibration Control." Journal of Dynamic Systems, Measurement, and Control 119, no. 2 (1997): 298–300. http://dx.doi.org/10.1115/1.2801250.

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Experimental results have recently demonstrated that an adaptive open-loop control strategy can be highly effective in the suppression of the unbalance induced vibration of rotors supported in active magnetic bearings. A synthesis method is presented for determining the adaptive law’s gain matrix such that the adaptation’s stability and steady-state performance are robust with respect to structured uncertainty.

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21

Saldaña-Flores, Karla Estefanía, René Alejandro Flores-Estrella, Victor Alcaraz-Gonzalez, et al. "Regulation of Hydrogen Peroxide Dosage in a Heterogeneous Photo-Fenton Process." Processes 9, no. 12 (2021): 2167. http://dx.doi.org/10.3390/pr9122167.

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In this work, a classical linear control approach for the peroxide (H2O2) dosage in a photo-Fenton process is presented as a suitable solution for improving the efficiency in the treatment of recalcitrant organic compounds that cannot be degraded by classical wastewater treatment processes like anaerobic digestion. Experiments were carried out to degrade Lignin, Melanoidin, and Gallic acid, which are typical recalcitrant organic compounds present in some kinds of effluents such as vinasses from the Tequila and Cachaça industries. Experiments were carried in Open-Loop mode for obtaining the deg

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22

Attia, Mohamed Sadok, Mohamed Karim Bouafoura, and Naceur Benhadj Braiek. "Decentralized Suboptimal State Feedback Integral Tracking Control Design for Coupled Linear Time-Varying Systems." Mathematical Problems in Engineering 2020 (July 26, 2020): 1–10. http://dx.doi.org/10.1155/2020/7519014.

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In this paper, a suboptimal state feedback integral decentralized tracking control synthesis for interconnected linear time-variant systems is proposed by using orthogonal polynomials. Particularly, the use of operational matrices allows, by expanding the subsystem input states and outputs over a shifted Legendre polynomial basis, the conversion of time-varying parameter differential state equations to a set of time-independent algebraic ones. Hence, optimal open-loop state and control input coefficients are forwardly determined. These data are used to formulate a least-square problem, allowin

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23

Arshad H. Malik, Aftab A. Memon, Feroza Arshad, and Mehwish Shaikh. "Fractional Order Modeling of PWR Pressurizer Dynamics and Fractional Order Nonlinear H∞ Controllers Design in LabVIEW." Proceedings of the Pakistan Academy of Sciences: A. Physical and Computational Sciences 59, no. 3 (2022): 17–25. http://dx.doi.org/10.53560/ppasa(59-3)778.

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The novel fractional order intelligent transient dynamics and advanced fractional order nonlinear robust control synthesis scheme of the Pressurized Water Reactor (PWR) pressurizer are addressed in this research work. The Graphical User Interface (GUI) is designed for closed-loop model-based PWR pressurizer dynamical studies in LabVIEW. Based on the demand for power, the reactor power and turbine power are predicted using a fractional order backpropagation algorithm in an open loop configuration. Using turbine power and heater power as input variables, pressurizer level, pressurizer pressure a

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24

Goh, C. J., and W. Y. Yan. "An H∞ Synthesis of Robust Current Error Feedback Learning Control." Journal of Dynamic Systems, Measurement, and Control 118, no. 2 (1996): 341–46. http://dx.doi.org/10.1115/1.2802326.

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Conventionally, iterative learning control law is updated using past error information. As a result, the controller is effectively open-loop, apart from being unable to control unstable systems, it also does not share the robustness properties of feedback systems. It is proposed that current error feedback should be used to update the learning control law instead. We present a systematic design procedure based on the H∞ control theory to construct a robust current error feedback learning control law for linear-time-invariant, and possibly unstable, systems. The optimal design will ensure: 1 Th

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25

Choi, K. Y., and D. N. Butala. "Synthesis of open-loop controls for semibatch copolymerization reactors by inverse feedback control method." Automatica 25, no. 6 (1989): 917–23. http://dx.doi.org/10.1016/0005-1098(89)90058-7.

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Kemp, G. J. "Studying metabolic regulation in human muscle." Biochemical Society Transactions 28, no. 2 (2000): 100–103. http://dx.doi.org/10.1042/bst0280100.

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Phosphorus magnetic resonance spectroscopy, despite some limitations, is a valuable non-invasive window on muscle metabolism in vivo, particularly oxidative ATP synthesis. A number of experiments have shown this to be dominated by closed-loop feedback mechanisms: a well-known model posits regulation by ADP, but there are others, difficult to distinguish experimentally. Moreover the contribution of open-loop control mechanisms (‘feed forward’ or ‘parallel activation’) in vivo remains controversial. Progress will require more precise data, better integrated with other measurements (e.g. muscle o

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Musielak, Ewelina, Agnieszka Feliczak-Guzik, and Izabela Nowak. "Optimization of the Conditions of Solid Lipid Nanoparticles (SLN) Synthesis." Molecules 27, no. 7 (2022): 2202. http://dx.doi.org/10.3390/molecules27072202.

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Solid lipid nanoparticles (SLNs) have been synthesized as potential drug delivery systems. They are classified as solid lipid nanocarriers that can successfully carry both hydrophilic and hydrophobic drugs. SLNs are based on a biocompatible lipid matrix that is enzymatically degraded into natural components found in the human body. Solid lipid nanoparticles are suitable for the incorporation of hydrophobic active ingredients such as curcumin. The study included the optimization of lipid nanoparticle composition, incorporation of the active compound (curcumin), a stability evaluation of the obt

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Chan, Jenq-Tzong H. "Optimal Output Feedback Regulator—A Numerical Synthesis Approach for Input-Output Data." Journal of Dynamic Systems, Measurement, and Control 118, no. 2 (1996): 360–66. http://dx.doi.org/10.1115/1.2802330.

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A numerical approach is proposed in this work for computing a linear quadratic optimal regulator from input-output data. The method is applicable whenever the plant is open-loop stable. The major advantages of the method are two-fold. First, it involves an output feedback control law; hence, no state estimation is required for implementation. Second, the computation of this optimal controller can be conducted without explicit identification of the plant model.

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ZAFIRIOU, EVANGHELOS, and MANFRED MORARI. "Internal model control: robust digital controller synthesis for multivariable open-loop stable or unstable processes." International Journal of Control 54, no. 3 (1991): 665–704. http://dx.doi.org/10.1080/00207179108934181.

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30

Banks, David. "Thermogeological assessment of open-loop well-doublet schemes: a review and synthesis of analytical approaches." Hydrogeology Journal 17, no. 5 (2009): 1149–55. http://dx.doi.org/10.1007/s10040-008-0427-6.

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31

Rastegar, J., and Q. Tu. "Approximated Grashof-Type Movability Conditions for RSSR Mechanisms With Force Transmission Limitations." Journal of Mechanical Design 114, no. 1 (1992): 74–81. http://dx.doi.org/10.1115/1.2916928.

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Closed-form Grashof-type movability conditions are derived for closed-loop RSSR mechanisms using a geometrical approximation technique. The conditions that ensure the presence of crank-rocker and drag-link type mechanisms are derived with and without force transmission limitations. The force transmission limitations may be specified as a function of the output link angle. The accuracy of the approximated conditions is analyzed. As an example, the conditions are used to synthesize a function generating mechanism with fully rotatable crank and with various force transmission requirements. The de

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Utrata, Grzegorz, and Jaroslaw Rolek. "The Induction Motor MRAS-Based Speed Estimator Capable of Modelling the Slip Frequency Dependent Variability of the Rotor Impedance." Energies 16, no. 6 (2023): 2591. http://dx.doi.org/10.3390/en16062591.

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Speed feedback is indispensable not only for closed-loop controlled induction motors (IM) but also for the state monitoring systems of open-loop controlled IMs. Replacing speed sensors with speed estimations has many advantages including, e.g., hardware complexity reduction, sensor cabling elimination, and reduction of IM drive costs. From the various methods for IM speed estimation proposed in the literature, the model reference adaptive system (MRAS)-based speed estimator stands out because of its straightforward synthesis technique and lower computational complexity. On the other hand, this

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33

Qu, Haibo, Sheng Guo, and Ying Zhang. "A novel relative degree-of-freedom criterion for a class of parallel manipulators with kinematic redundancy and its applications." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 22 (2016): 4227–40. http://dx.doi.org/10.1177/0954406216664756.

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The mobility of a whole parallel manipulator and the relative degree-of-freedom are the key points in mechanism synthesis and analysis, which often can be used to verify the existence of mechanisms. In this paper, the difference between the mobility of a parallel manipulator and the relative degree-of-freedom is discussed. First, a novel relative degree-of-freedom criterion is proposed based on the principle of determining the moving platform by N point positions, which is suitable for a kind of parallel manipulator with spherical joints attached to the moving platform. Next, the relative degr

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Sheng, Yan, Chao Wang, Ying Pan, and Xinhua Zhang. "Modified LQG/LTR Control Methodology in Active Structural Control." Journal of Low Frequency Noise, Vibration and Active Control 22, no. 2 (2003): 97–108. http://dx.doi.org/10.1260/026309203322770347.

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This paper presents a new active structural control design methodology comparing the conventional linear-quadratic-Gaussian synthesis with a loop-transfer-recovery (LQG/LTR) control approach for structures subjected to ground excitations. It results in an open-loop stable controller. Also the closed-loop stability can be guaranteed. More importantly, the value of the controller's gain required for a given degree of LTR is orders of magnitude less than what is required in the conventional LQG/LTR approach. Additionally, for the same value of gain, the proposed controller achieves a much better

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So, Gun-Baek. "Design of Linear PID Controller for Pure Integrating Systems with Time Delay Using Direct Synthesis Method." Processes 10, no. 5 (2022): 831. http://dx.doi.org/10.3390/pr10050831.

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The pure integrating process model with dead-time is inherently an unstable open-loop system. This paper presents a 2-DOF (2-degree of freedom) PID controller, based on the direct synthesis (DS) method, to improve the set-point tracking and load disturbance rejection performance for the pure integrating processes with time delays (PIPTD) models. The 2-DOF PID controller consists of a linear PID controller for rejecting the load disturbance in regulatory response and a set-point filter for relieving the overshoot in servo response. The DS method is based on comparing the desired closed-loop cha

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Sassano, Mario, Thulasi Mylvaganam, and Alessandro Astolfi. "On the analysis of open-loop Nash equilibria admitting a feedback synthesis in nonlinear differential games." Automatica 142 (August 2022): 110389. http://dx.doi.org/10.1016/j.automatica.2022.110389.

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Gong, Sheng Zhao, and Jian Hua Cheng. "Characterization and Synthesis of Quaternary Ammonium Salt of Chitosan by Open-Loop Method of Epoxy Derivatives." Advanced Materials Research 781-784 (September 2013): 969–74. http://dx.doi.org/10.4028/www.scientific.net/amr.781-784.969.

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Quaternary ammonium salt of chitosan (HACC) was synthesized by the reaction of chitosan(CTS) and 2, 3-epoxypropyltrimethyl- ammonium chloride(GTA) in isopropanol. The influence factors of the degree of substitution of synthetic reaction, such as the molar ratio of reactants, the reaction time, temperature and so on were discussed by single factor experiments.The results showed that the optimal conditions for the preparation were nGTA: nCTS=4:1, the reaction time 8h, the reaction temperature 75°C, the reaction pH value 7, the alkalization time 14h, the molecular weight of chitosan 320000g/mol,

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Sassano, Mario, and Alessandro Astolfi. "Constructive design of open-loop Nash equilibrium strategies that admit a feedback synthesis in LQ games." Automatica 133 (November 2021): 109840. http://dx.doi.org/10.1016/j.automatica.2021.109840.

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Yang, Wenjian, Yongtao Li, Rongjiang Cui, and Hongmei Kang. "A New Tree Graph Method for Synthesizing Planetary Gear Trains of Vehicle Powertrains." Energies 16, no. 20 (2023): 7186. http://dx.doi.org/10.3390/en16207186.

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The function of vehicle powertrains is to transmit power from the power source (engine or electric machine) to the output shaft. Different torques and speeds of the output shaft are achieved through the structure of planetary gear train (PGT). The performance of a powertrain depends on the choice of topological structure of the PGT to a large extent. The topological synthesis of PGTs is of great significance to the design of new powertrains. A tree graph method for the topological synthesis of PGTs is proposed in this paper. Firstly, the rules for generating (N + 1)-link tree graphs from N-lin

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Gao, Fang. "The Synthesis of the Amphiphilic Triblock Cationic Copolymer mPEG-PCL-PDMAEMA the Synthesis and its Impact Study on the Load and Transfected of siRNA." Applied Mechanics and Materials 443 (October 2013): 605–8. http://dx.doi.org/10.4028/www.scientific.net/amm.443.605.

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Polyphosphate is a biocompatible, modified and functionalized biodegradable polymer. It has a broad application prospects in the field of medical biomaterials. It is an excellent drug carrier material. In this essay, through the open-loop and ATRP polymerization, it synthesizes biodegradable amphiphilic triblock copolymer PEG-PCL-PDMAEMA. Composition and structure of the polymer is Characterized by 1H NMR and IR In this essay. This essay also studies that the polymer in water can be self-assembled to form a stable nanoparticles; The polymer micelle can form composite particles with siRNA,. Thi

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Пасичник, Сергей Николаевич, та Дмитрий Вадимович Сокол. "РЕШЕНИЕ ЗАДАЧИ СТАБИЛИЗАЦИИ ТЕМПЕРАТУРЫ ВОЗДУХА В КАБИНЕ ТРАНСПОРТНОГО СРЕДСТВА". Aerospace technic and technology, № 4 (14 жовтня 2018): 12–19. http://dx.doi.org/10.32620/aktt.2018.4.02.

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The subject matter of the article is the processes of synthesis of the automatic stabilization system (ASS) of the temperature in the vehicle cabin simulator using the vortex energy separator (VES) as the executive element of the system. The goal is to correct element synthesis of the ASS (CEs), which provides stability and quality of stabilization with the intensive change in the thermal load. The tasks to be solved are: to construct the functional scheme of the ASS which consist of the positioning circuit of the modes of the VES and the air temperature stabilization circuit in the cabin simu

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Bhat, S. P., M. Tanaka, and D. K. Miu. "Experiments on Point-to-Point Position Control of a Flexible Beam Using Laplace Transform Technique: Part I—Open-Loop." Journal of Dynamic Systems, Measurement, and Control 113, no. 3 (1991): 432–37. http://dx.doi.org/10.1115/1.2896428.

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When lightly damped flexible structures are used in high bandwidth applications, the elimination of residual vibration during point-to-point positioning is an important engineering problem. Using the Laplace domain synthesis technique introduced in earlier publications, experiments on the precise point-to-point position control of a flexible beam have been performed. In Part I of this two-part paper, results related to open-loop control are presented. A variety of candidate control functions are evaluated and performance issues related to robustness and sensitivity are investigated.

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Robson, Nina, and Shramana Ghosh. "Geometric design of planar mechanisms based on virtual guides for manipulation." Robotica 34, no. 12 (2015): 2653–68. http://dx.doi.org/10.1017/s0263574715000272.

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SUMMARYThis paper presents recent results and applications of our planar kinematic synthesis of serial and parallel linkages to guide a rigid body, such that it does not violate normal direction and curvature constraints imposed by contact with objects in the environment. The paper briefly reviews the recently developed theory on transforming contact direction and curvature constraints into conditions on velocity and acceleration of certain points in the moving body to obtain synthesis equations which can, subsequently be solved to find the dimensions of a mechanical linkage. The main contribu

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Chen, Dar-Zen, and Shuen-Chen Shiue. "Topological Synthesis of Geared Robotic Mechanisms." Journal of Mechanical Design 120, no. 2 (1998): 230–39. http://dx.doi.org/10.1115/1.2826963.

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An efficient and systematic methodology for the topological synthesis of geared robotic mechanisms is developed. The approach is based on the idea that the kinematic structure of a geared robotic mechanism can be described by an equivalent open-loop chain (EOLC) and mechanical transmission lines (MTLs) which drive the joints of the EOLC. It is shown that an MTL can be decomposed as an input unit and several transmission units connected in series. The characteristics of the input and transmission units are laid out and a systematic methodology is developed to enumerate all admissible input and

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Laverde, Eduardo E., Yanhao Lai, Fenfei Leng, Lata Balakrishnan, Catherine H. Freudenreich, and Yuan Liu. "R-loops promote trinucleotide repeat deletion through DNA base excision repair enzymatic activities." Journal of Biological Chemistry 295, no. 40 (2020): 13902–13. http://dx.doi.org/10.1074/jbc.ra120.014161.

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Trinucleotide repeat (TNR) expansion and deletion are responsible for over 40 neurodegenerative diseases and associated with cancer. TNRs can undergo somatic instability that is mediated by DNA damage and repair and gene transcription. Recent studies have pointed toward a role for R-loops in causing TNR expansion and deletion, and it has been shown that base excision repair (BER) can result in CAG repeat deletion from R-loops in yeast. However, it remains unknown how BER in R-loops can mediate TNR instability. In this study, using biochemical approaches, we examined BER enzymatic activities an

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Jung, Hunmin, Naveen Kumar Rayala та Seongmin Lee. "Translesion synthesis of the major nitrogen mustard-induced DNA lesion by human DNA polymerase η". Biochemical Journal 477, № 23 (2020): 4543–58. http://dx.doi.org/10.1042/bcj20200767.

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Nitrogen mustards are among the first modern anticancer chemotherapeutics that are still widely used as non-specific anticancer alkylating agents. While the mechanism of action of mustard drugs involves the generation of DNA interstrand cross-links, the predominant lesions produced by these drugs are nitrogen half-mustard-N7-dG (NHMG) adducts. The bulky major groove lesion NHMG, if left unrepaired, can be bypassed by translesion synthesis (TLS) DNA polymerases. However, studies of the TLS past NHMG have not been reported so far. Here, we present the first synthesis of an oligonucleotide contai

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Xin, Xiu Lan, Xue Han, and Qiong Hua Jin. "Synthesis of Spiropyran Photochromic Polymer." Advanced Materials Research 380 (November 2011): 64–68. http://dx.doi.org/10.4028/www.scientific.net/amr.380.64.

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Photochromic spiropyran material is of the most extensive and in-depth category. Small molecule spiropyran ring by UV irradiation, the color is less stable body, which restricts the widespread use of these compounds. In this paper, the introduction of spiropyran compounds with substituents on the group method of open-loop stability, which will contain active groups spiropyran monomers in the polymer side chain connected to a rigid polymer to limit the use of spiropyran ring merocyanine body rotation, so that the body color is more stable. This selection and design of the process is simple with

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Saheb, Dutta, Kundu Soumya, and Nandi Nilashis. "Analysis of Debye Waller factor and molecular dynamics simulation of Seryl tRNA synthetase." Journal of Indian Chemical Society Vol. 91, Jun 2014 (2014): 1125–44. https://doi.org/10.5281/zenodo.5723463.

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Department of Chemistry, University of Kalyani, Kalyani-741 235, Nadia, West Bengal, India <em>E-mail </em>: nilashisnandi@yahoo.com Fax : 91-33-25828282 Manuscript received online 06 October 2013, revised 29 November 2013, accepted 06 January 2014 Aminoacyl tRNA synthetases are enzymes responsible for first step of protein synthesis. We studied the Debye Waller factor (B-factor) of Seryl tRNA synthetase (SerRS) and carried out classical molecular dynamics simulation of SerRS in the present paper. The objective is to study the dynamics of SerRS through the course of conformational changes in i

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Cheng, Yuqiang, and Jianjun Wu. "Particle swarm algorithm-based damage-mitigating control law analysis and synthesis for liquid-propellant rocket engine." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 233, no. 10 (2018): 3810–18. http://dx.doi.org/10.1177/0954410018806080.

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The damage-mitigating control is a novel technique to ameliorate the reliability and safety of liquid-propellant rocket engines by achieving an optimized trade-off level between overall dynamic performance of the liquid-propellant rocket engine and structural durability of some selected critical damageable components under the condition of no impact on the achievement of the launch and flight mission. Thus, it is needed to be solved for the damage-mitigating control that the global optimization of the best trade-off between the damage of the critical damageable components and the performance o

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Saeedian, Atefeh, Farshad Merrikh-Bayat, and Abolfazl Jalilvand. "Multivariable fractional-order PID tuning by iterative non-smooth static-dynamic H∞ synthesis." Fractional Calculus and Applied Analysis 24, no. 4 (2021): 1094–111. http://dx.doi.org/10.1515/fca-2021-0047.

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Abstract This paper proposes a new method for tuning the parameters of multi-input multi-output (MIMO) fractional-order PID (FOPID) controller. The aim of the proposed method is to calculate the parameters of this controller such that the rise time and steady-state errors of the feedback system are minimized without violating the predetermined stability margins. Mathematically, this problem is formulated as maximizing the spectral norm of the open-loop transfer matrix at zero frequency subject to a constraint on the H∞ -norm of the sensitivity function. This problem is nonlinear in parameters

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