Mechanisms and time-scales in breakup of 6,7Li

The current and near future of nuclear physics is being directed by the availability of radioactive ion beams and exotic nuclei near the neutron drip line. Reactions with the weakly-bound but stable {u2076}Li and {u2077}Li nuclei were thus studied as a testbed for relating nuclear structure of weakly-bound and unstable nuclei to nuclear reaction outcomes within a coherent framework, an important goal in nuclear reaction theory. Coincidence measurements of charged fragments produced from the reactions of {u2076},{u2077}Li with high-Z targets were carried out, at sub-barrier energies, using a large-area position sensitive detector array at back-angles. The wide and continuous angular coverage of the detector, and the choice of sub-barrier energies, were crucial in obtaining clear conclusions. For the reactions with {u2076}Li, the observed {u03B1} + d and {u03B1} + p coincidences show direct cluster breakup ({u2076}Li {u21E2}{u03B1} + d), but also large yields of breakup triggered by n-transfer ({u2076}Li {u21E2}{u2075}Li {u21E2}{u03B1} + p). Coincidences between {u03B1} + {u03B1} were also observed indicating breakup triggered by d-transfer ({u2076}Li {u21E2}{u2078}Be {u21E2}{u03B1} + {u03B1}). For the {u2077}Li-induced reactions, direct cluster breakup ({u2077}Li {u21E2}{u03B1} + t) was observed, but more probable was p-pickup by the projectile resulting in {u03B1} + {u03B1} coincidences ({u2077}Li {u21E2}{u2078}Be {u21E2}{u03B1} + {u03B1}). The measured relative energy gives an indication of the time-scales for each breakup mode, allowing a comparison with the time-scales for direct nuclear reactions and fusion. These measurements demonstrate that the reaction dynamics and outcomes are determined not only by the properties of the two colliding nuclei, but also by the ground-state and excited state properties of their neighbours. This is a key insight for understanding and predicting reactions of weakly-bound nuclei near the limits of nuclear existence. Furthermore, the results suggest that in sub-barrier collisions of {u2076}Li and {u2077}Li with all but the lightest nuclei, the most likely nuclear reactions will lead to breakup of the projectile-like nucleus, forming elements lighter than Li. This needs to be tested experimentally for collisions with much lighter nuclei, and possible implications for lithium abundances in cosmological processes investigated

Spacecraft Reed-Solomon downlink module

Apparatus and method for providing downlink frames to be transmitted from a spacecraft to a ground station. Each downlink frame includes a synchronization pattern and a transfer frame. The apparatus may comprise a monolithic Reed-Solomon downlink (RSDL) encoding chip coupled to data buffers for storing transfer frames. The RSKL chip includes a timing device, a bus interface, a timing and control unit, a synchronization pattern unit, and a Reed-Solomon encoding unit, and a bus arbiter

Removal of Power Line Interference from Electrocardiograph (ECG) using Proposed Adaptive Filter Algorithm

ECG signals in measurements are contaminated by noises including power line interference. In recent years, adaptive filters with different approaches have been investigated to remove power line interference in ECG.In this paper, an adaptive filter is proposed to cancel power line interference in ECG signals. The proposed algorithm is experimented with MIT-BIH ECG signals data base. The algorithm2019;s results are compared with the results of other adaptive filter algorithms using Least Mean Square (LMS), Normalized Least Mean Square (NLMS) by Signal to Noise (SNR). Theses works are performed by LabVIEW software

BLENDED LEARNING IN BADMINTON TRAINING FOR PROFESSIONALS: STUDENTS’ PERCEPTIONS AND PERFORMANCE IMPACTS

As with other subject areas, badminton instruction for practitioners is experiencing a lot of changes under the impact of technology. Recently there has been the possibility of moving badminton training classes to the online platform but there is no consensus on its efficacy. This study is conducted to study the effects of blended learning activities on the perceptions and performance of students in physical education. Forty students in physical education are selected and divided into two groups: an experimental group, and a control group. All groups in face-to-face learning sessions have the same curriculum, course-book, equipment and teaching method. The questionnaire and interview data show that students in blended class sessions had positive perceptions of learning activities.  Article visualizations