Effective Dynamic Range in Measurements with Flash Analog-to-Digital Convertor

Flash Analog to Digital Convertor (FADC) is frequently used in nuclear and particle physics experiments, often as the major component in big multi-channel systems. The large data volume makes the optimization of operating parameters necessary. This article reports a study of a method to extend the dynamic range of an 8-bit FADC from the nominal $\rm{2^8}$ value. By comparing the integrated pulse area with that of a reference profile, good energy reconstruction and event identification can be achieved on saturated events from CsI(Tl) crystal scintillators. The effective dynamic range can be extended by at least 4 more bits. The algorithm is generic and is expected to be applicable to other detector systems with FADC readout.Comment: 19 pages, 1 table, 10 figure

Dynamics and Berry phase of two-species Bose-Einstein condensates

In terms of exact solutions of the time-dependent Schrodinger equation for an effective giant spin modeled from a coupled two-mode Bose-Einstein condensate (BEC) with adiabatic and cyclic time-varying Raman coupling between two hyperfine states of the BEC, we obtain analytic time-evolution formulas of the population imbalance and relative phase between two components with various initial states, especially the SU(2)coherent state. We find the Berry phase depending on the number parity of atoms, and particle number dependence of the collapse revival of population-imbalance oscillation. It is shown that self-trapping and phase locking can be achieved from initial SU(2) coherent states with proper parameters.Comment: 18 pages,5 figure

Investigation of significant microRNA-mRNA pairs associated with nonspecific digestive disorder in rabbits

[EN] Nonspecific digestive disorders (NSDD) are one of the major intestinal problems in rabbit, with considerable economic losses in industrial rabbit farms. MicroRNAs (miRNAs), as small non-coding RNAs, have significant biological involvement in intestinal disorders. In this study, we investigated the expression levels of 25 genes and 25 miRNAs in ileum, rabbit sacculus rotundus (RSR) and colon tissues from 9 rabbits with different severity of NSDD. These molecules have been found to be related to NSDD or inflammatory bowel disease, which will help recognise the miRNA-mRNA pairs. Finally, 108 possible pairs of miRNA-mRNA pairs with an anti-correlation were identified by Pearson’s correlation analysis between differentially expressed 25 miRNAs and 23 mRNAs. Ninety-five of these miRNA-mRNA pairs were hitherto unexplored, and their roles in NSDD biology require further elucidation. Our results give a clue to the potential miRNA-mRNA pairs for the NSDD that can further improve the understanding of the pathogenesis of NSDD in rabbit.This work was financially supported by the Earmarked Fund for China Agriculture Research System (Grant No: CARS-44-A-2)Jia, X.; Liao, Q.; Chen, S.; Wang, J.; Lai, S. (2017). Investigation of significant microRNA-mRNA pairs associated with nonspecific digestive disorder in rabbits. World Rabbit Science. 25(4):345-355. https://doi.org/10.4995/wrs.2017.6839SWORD34535525

Simple technologies for fabrication of low-loss silica waveguides

A simple and reproducible technology is developed for the fabrication of low-loss silica waveguides on silicon substrates. The guiding layer is formed by changing the Si-O ratio composition of the SiO/sub 2/ layer. The waveguides can be made to have a good match to either optical fibres or guided-wave devices in III-V compound semiconductor

Increasing Precipitation Decreases Water Use Efficiency of Alfalfa (\u3ci\u3eMedicago sativa\u3c/i\u3e L.) in a Semiarid Region

Alfalfa (Medicago sativa L.) plays an important role within the integrated farming systems in Northwestern Loess Plateau of China, because of its traits on a high productivity, prolonged growing season, and excellent nutritive value. However, water use efficiency (WUE) is a crucial indicator for forage production under different water conditions in the semiarid regions. To explore the responses of alfalfa growth and water use to precipitation variability, we set precipitation shelters to manipulate precipitation scenario as 30% precipitation increased (P+30), normal precipitation (CK), and 30% precipitation decreased (P-30) with the measurement of dry matter yield and soil water content. An alfalfa variety Zhongmu No.1 was sown in autumn of 2018 and harvested at flowering. Soil water was sampled in the depth of 0-2.0 m by a soil auger in 2019. The results showed that the total biomass yield for three cuts among the precipitation treatments had significant difference (P\u3c 0.05), with 12125.5, 11685.3, and 11167.2 kg ha-1 under treatment P+30, CK and P-30, respectively. The WUE of dry matter yield in P-30 treatment had the highest value, higher 25.5% and 10.3% than that in P+30 and CK treatment, respectively (P\u3c 0.05). We conclude that increasing precipitation could not improve the WUE of alfalfa, which indicates the wide adaptability of alfalfa in variable rainfall conditions in semiarid region