Eternally non-Markovian dynamics of a qubit interacting with a single-photon wavepacket

An evolution of a two-level system (qubit) interacting with a single-photon wave packet is analyzed. It is shown that a hierarchy of master equations gives rise to phase covariant qubit evolution. The temporal correlations in the input field induce nontrivial memory effects for the evolution of a qubit. It is shown that in the resonant case whenever time-local generator is regular (does not display singularities) the qubit evolution never displays information backflow. However, in general the generator might be highly singular leading to intricate non-Markovian effects. A detailed analysis of the exponential profile is provided which allows to illustrate all characteristic feature of the qubit evolution.

Detection for Multisatellite Downlink Signal Based on Generative Adversarial Neural Network

A method for satellite downlink signal detection based on a generative adversarial network is proposed. The generator adversarial network and adversarial network are established, respectively. The generator network realizes the local generator of satellite signals, and the adversarial network is used for high-precision signal detection. The error network is generated by the error signal to form the satellite link downlink. The network reconstructs the optimal weights by generating errors, forms an error matrix for different satellite downlink, and then forms an adaptive matrix weight adjustment. Through the reconstruction of the optimal detection matrix, detection for the downlink signals of multiple satellites is completed. The proposed generative adversarial network can realize the high-precision detection for the downlink signal.

IMPLEMENTASI AUTOMATIC TRANSFER SWITCH BERBASIS PLC PADA LABORATORIUM TEKNIK ELEKTRONIKA JURUSAN TEKNIK ELEKTRO UNIVERSITAS LAMPUNG

Abstrak Laboratorium Elektronika Jurusan Teknik Elektro Universitas Lampung merupakan tempat bagi para mahasiswa dalam melakukan studi, praktikum maupun penelitian dengan listrik sebagai kebutuhan utamanya. Tanpa listrik, kegiatan-kegiatan tersebut akan terhenti. Sebagaimana diketahui, listrik di Indonesia dilayani oleh Perusahaan Listrik Indonesia yang merupakan satu-satunya perusahaan terbesar yang menyediakan listrik untuk Indonesia. Sehingga ketika terjadi pemadaman akibat adanya perawatan, tidak ada suplai daya cadangan yang dapat melayani. Kalaupun ada, itu berupa genset yang melayani listrik secara terbatas. Selain itu perlu peran manusia dalam mengoperasikannya. Pengoperasian oleh manusia memiliki banyak kelemahan. Untuk itu, perlu adanya sebuah alat atau mekanisme yang dapat menggantikan kerja yang dilakukan secara manual oleh manusia menjadi otomatis. Automatic Transfer Switch (ATS) merupakan salah satu solusi pemecahan masalah ini. ATS ini akan menggantikan peran operator genset yang harus siaga saat terjadi pemadaman pada sumber utama listrik yaitu PLN. Pekerjaan yang digantikan oleh ATS dari operator di antaranya menyalakan genset saat terjadi pemadaman (starting genset), memantau kondisi operasi genset hingga normal dan siap menyuplai daya, memindahkan saklar beban utama dari sumber listrik PLN ke genset maupun sebaliknya serta mematikan genset saat sumber listrik PLN sudah kembali menyuplai daya. Kata kunci : Genset, PLN, Beban, ATS Abstract An Electronica’s Laboratory in Electrical Engineering University of Lampung is a place for students to study, practice and making some reasearch with an electricity power as the main requirment. Without electricity power, anyother activity will be stopped. As we know, Indonesian electricity supplied by Perusahaan Listrik Negara as the only one the largest electricity company in Indonesia. Then, when it stopping the services, there is no one can supplied back up electricity. Moreover, local generator can give the eletricity but it’s limited. But, when it’s running also need to controlling. So, we need some tools or mechanism that changing human work from manual to automatic. Automatic Transfer Switch (ATS) is one of the solution in this case. ATS can changing human work as a genset operator that have to standbye when electricity down from the main source, thats PLN. Some work should handled by ATS such as get local generator running when electricity was down (genset setarting), monitoring local generator till it’s get normally running and ready to supply the electricity, changing the main switch of load from PLN electricity source to localy generator or return and also get local generator running off when PLN come to supplied the electricity back. Keyword : local generator, PLN, load, ATS.