Ideologi T-Shirt Bebaskan JRX Sebagai Sebuah Komoditi dan Simbol Perlawanan Terhadap Kekuasaan

Clothing has become an important part of the lifestyle and has become a fashion trend in Balinese society. Clothing is very closely related to the human self, through clothing can reveal many things about the identity of the wearer from the appearance reflected how the social status and personality of the wearer. Currently, the t-shirt is a popular clothing used by people from all walks of life because it is easy to clean and the model remains eternal from time to time. T-shirts have several conveniences, apart from being cheap, comfortable to wear, easy to clean, mobile, functional, and can be used as souvenirs, and so on, this makes business people and politicians realize that t-shirts can be used as a gift. an effective and efficient promotional media, apart from being a means of advertising t-shirts, it is also used as a medium to spread political understanding. Of the several functions possessed by the t-shirt, it is related to the function of the t-shirt as a medium for delivering messages and aspirations. Currently, several types of t-shirts have emerged that carry the aspirations of several groups of people who empathize with the case that befell the drummer for the Superman Is Dead band, I Gede Ari Astina, or who is familiarly called Jerink, later shortened to JRX. Regarding this case, many JRX sympathizers thought that he did not deserve to be punished, without holding mediation to bridge the problem between JRX and IDI Bali which he criticized, but the JRX case went straight to the legal process so that it was considered by some groups of society as an act. silence the aspirations of the small people who try to voice injustice in this country, therefore several individual formation practices have emerged that determine their common social orientation, this community movement group has the same ideology and so that they can act structurally so that it is in line with their ideology. stretcher, then in the process of marking the ideology, several t-shirt designs emerged with the theme “free JRX” with various variants, designs, colors that emerged from several groups that had the same ideology

Practical finite time vibration suppression of mechatronic systems using proportional–integral–derivative variable structure controls with dead-band nonlinearity

Vibration is an intrinsic phenomenon in many mechanical and mechatronic applied devices and undesirable vibration can either degrade the performance of the system or lead to unpredictable outputs. The main purpose of this article is to introduce a novel second-order proportional–integral–derivative sliding mode control methodology to suppress the undesirable vibrations of a class of applied dynamical systems with applications to mechatronic and mechanical devices. After designing a nonlinear proportional–integral–derivative terminal sliding manifold, rigorous mathematics are provided to guarantee that the origin is a practical finite time stable equilibrium point. Consequently, two efficient control laws are proposed to ensure the occurrence of the sliding motion with and/or without system unknown parameters. Motivated by situations encountered in practice, unknown lumped uncertainties are also added to the system and their impacts are tackled using adaptive control techniques. Furthermore, a hard nonlinear dead-band function is utilized in the control input and its effects such as lags and delays appeared on the control signals as well as on the system outputs are dealt with by the proposed proportional–integral–derivative variable structure controller. The proposed second-order variable structure controller not only utilizes the simple effective design approach of the proportional–integral–derivative controllers to ensure a reasonable transient performance, but also displays fast convergence properties demonstrated in non-singular terminal sliding modes. Finally, through simulation studies, it is confirmed that the proposed control strategy is effective in vibration attenuation of microelectromechanical resonators.

Trajectory correction for lunar flyby transfers to libration point orbits using continuous thrust

Trajectory corrections for lunar flyby transfers to Sun-Earth/Moon libration point orbits (LPOs) with continuous thrusts are investigated using an ephemeris model. The lunar flyby transfer has special geometrical and dynamical structures; therefore, its trajectory correction strategy is considerably different from that of previous studies and should be specifically designed. In this paper, we first propose a control strategy based on the backstepping technique with a dead-band scheme using an ephemeris model. The initial error caused by the launch time error is considered. Since the perturbed transfers significantly diverge from the reference transfers after the spacecraft passes by the Moon, we adopt two sets of control parameters in two portions before and after the lunar flyby, respectively. Subsequently, practical constraints owing to the navigation and propellant systems are introduced in the dynamical model of the trajectory correction. Using a prograde type 2 orbit as an example, numerical simulations show that our control strategy can efficiently address trajectory corrections for lunar flyby transfers with different practical constraints. In addition, we analyze the effects of the navigation intervals and dead-band scheme on trajectory corrections. Finally, trajectory corrections for different lunar flyby transfers are depicted and compared.

Droop Control Strategy of Utility-Scale Photovoltaic Systems Using Adaptive Dead Band

This paper proposes a novel droop control strategy for addressing the voltage problem against disturbance in a transmission system connected with a utility-scale photovoltaic. Typically, a voltage control at the renewable energy sources (RESs) connected to the transmission grid uses a reactive power–voltage control scheme with a fixed dead band. However, this may cause some problems; thus, this paper proposes a method for setting a dead band value that varies with time. Here, a method for calculating an appropriate dead band that satisfies the voltage maintenance standard for two disturbances is described using voltage sensitivity analysis and the equation of existing droop control. Simulation studies are conducted using the PSS® E program to analyze the short term voltage stability and display the results for various dead bands. The proposed modeling and operational strategy are validated in simulation using a modified IEEE 39 bus system. The results provide useful information, indicating that the control scheme through an adaptive dead band enables more stable system operation than that through a fixed dead band.