149 research outputs found
Defect solitons supported by nonlocal PT symmetric superlattices
The existence and stability of defect solitons supported by parity-time (PT)
symmetric superlattices with nonlocal nonlinearity are investigated. In the
semi-infinite gap, in-phase solitons are found to exist stably for positive or
zero defects, but can not exist in the presence of negative defects with strong
nonlocality. In the first gap, out-of-phase solitons are stable for positive or
zero defects, whereas in-phase solitons are stable for negative defects. The
dependence of soliton stabilities on modulation depth of the PT potentials is
studied. It is interesting that solitons can exist stably for positive and zero
defects when the PT potentials are above the phase transition points.Comment: 12 figures, 6 pages, Accepted by EP
On the Capacity Region of Reconfigurable Intelligent Surface Assisted Symbiotic Radios
In this paper, we are interested in reconfigurable intelligent surface
(RIS)-assisted symbiotic radio (SR) systems, where an RIS assists a primary
transmission by passive beamforming and simultaneously acts as an information
transmitter by periodically adjusting its reflecting coefficients. The above
modulation scheme innately enables a new multiplicative multiple access channel
(M-MAC), where the primary and secondary signals are superposed in a
multiplicative and additive manner. To pursue the fundamental performance
limits of the M-MAC, we focus on the characterization of the capacity region of
such systems. Due to the passive nature of RISs, the transmitted signal of the
RIS should satisfy the peak power constraint. Under this constraint at the RIS
as well as the average power constraint at the primary transmitter (PTx), we
analyze the capacity-achieving distributions of the transmitted signals and
characterize the capacity region of the M-MAC. Then, theoretical analysis is
performed to reveal insights into the RIS-assisted SR. It is observed that: 1)
the capacity region of the M-MAC is strictly convex and larger than that of the
conventional TDMA scheme; 2) the secondary transmission can achieve the maximum
rate when the PTx transmits the constant envelope signals; 3) and the sum rate
can achieve the maximum when the PTx transmits Gaussian signals and the RIS
transmits the constant envelope signals. Finally, extensive numerical results
are provided to evaluate the performance of the RIS-assisted SR and verify the
accuracy of our theoretical analysis
The carbohydrate-insulin model does not explain the impact of varying dietary macronutrients on the body weight and adiposity of mice
Acknowledgments This study was funded by the Chinese Academy of Sciences Strategic Program (XDB13030100), the K.C. Wong Foundation, the 1000 Talents Program, and a Wolfson Merit Award to J.R.S. We thank those in the molecular energetics group in Beijing who contributed to handling the animals and the measurement of their food intake and body weight, including L. Li, B. Li, M. Li, G. Wang, X. Zhang, J. Li, C. Niu, E. Couper, A. Whittington-Davies, and M. Mazidi. Author contributions S.H. was involved in the initial experiment design, conducted experiment one, analyzed the data from experiments one and two, performed the IPA-related analysis, and co-wrote the manuscript. L.W. was involved in the sample collection for experiments one and two and conducted the RNA extractions and the RNA-seq. J.T. was involved in the sample and data collection for experiments one and two. D.Y. and Y.X. performed the initial data collection and glucose measurements for experiment two. Y.W. conducted the insulin measurements and was involved in the initial data collection for experiment two. A.D. was involved in the RNA-seq-related analysis. J.R.S. directed both projects, conceived and designed the experiments, contributed to the data analysis, and co-wrote the paper. All of the authors approved the final version prior to submission for publication.Peer reviewedPublisher PD
Limits to Sustained Energy Intake XXXI : Effect of Graded Levels of Dietary Fat on Lactation Performance in Swiss Mice
We thank the staff of animal facility for their care of the animals. This study was funded by the National Key Research and Development Program of China (SQ2018YFA08003201) and the Chinese Academy of Sciences Strategic Program (XDB13030100).Peer reviewedPostprin
Impact of dietary sucrose on adiposity and glucose homeostasis in C57BL/6J mice depends on mode of ingestion : liquid or solid
The study was funded by the Chinese Academy of Sciences Strategic Program (XDB13030100), the 1000 Talents program, and the National Natural Science Foundation of China (91649108) and a Wolfson merit award from the Royal Society all to J.R.S.; J.T was supported by the CAS-TWAS president's fellowship.Peer reviewedPublisher PD
Increased Variation in Body Weight and Food Intake Is Related to Increased Dietary Fat but Not Increased Carbohydrate or Protein in Mice
Funding This study was funded by the National Key R&D Program of China (2019YFA0801900) to JS and the Postdoctoral Innovation Fund (2021) to YW. The original diet exposure experiment was funded by the Chinese Academy of Sciences Strategic Program (XDB13030100). JS was also supported during this work by a PIFI professorial fellowship from CAS and a Wolfson merit award from the UK Royal Society. CORRECTION article Front. Nutr., 21 October 2022 Sec. Nutrition and Metabolism https://doi.org/10.3389/fnut.2022.1049766 Corrigendum: Increased variation in body weight and food intake is related to increased dietary fat but not increased carbohydrate or protein in micePeer reviewedPublisher PD
Effect of Pu-erh tea pomace on the composition and diversity of cecum microflora in Chahua chicken No. 2
Pu-erh tea pomace (PTP), a solid substance after extracting functional substances or steeping tea, is rich in crude protein, and crude fiber, and could be used as considerable bioactive substances in animal production. However, its application as poultry feed and its role in regulating the characteristics of gut microorganisms is unclear. The present study investigated the effects of PTP on growth performance and gut microbes of chicken. A total of 144 Chahua chickens No. 2 were individually housed and divided into three groups which were fed diets containing 0% (CK), 1% PTP (T1), and 2% PTP (T2), respectively. The serum and cecum contents were collected after slaughter for analysis. The results indicated that growth performance and carcass traits were not affected by the PTP content. Serum total triglyceride (TG), total cholesterol (TC), and low-density lipoprotein cholesterol (LDL-C) levels in the T1 and T2 groups were significantly lower than in the CK group (p < 0.05). The gut microbiota α-diversity in the T2 group was significantly lower than in the CK group (p < 0.05). Based on partial least squares-discriminant analysis (PLS-DA), we observed significant segregation in gut bacterial communities among the groups. At the phylum level, Bacteroidetes and Firmicutes were dominant in the cecum, occupying about 85% of the cecum flora. The relative abundance of Bacteroidetes tended to increase. At the genus level, the relative abundance of Bacteroides is the highest in the CK、T1 and T2 groups. The relative abundances of Bacteroides and Prevotellaceae_UCG-001 microorganisms in the T2 group were significantly higher than in the CK group (p < 0.05). However, the relative abundance of CHKCI001 microorganisms in the T2 group was significantly lower compared to the CK group (p < 0.05). TG content was significantly positively correlated with CHKCI001 relative abundance, and significantly negatively correlated with Prevotellaceae_UCG-001 relative abundance (p < 0.05). Moreover, the LDL-C content was significantly positively correlated with CHKCI001 relative abundance (p < 0.05). In conclusion, PTP could decrease the cholesterol levels in the blood by improving the composition of gut microbiota, which provides a reference for the application of PTP in the poultry industry
Effects of dietary macronutrients and body composition on glucose homeostasis in mice
Funding This work was supported by the Chinese Academy of Sciences Strategic Programs (XDA12030209 and XDB13030100), the 1000 Talents Program and a Wolfson Merit Award to J.R.SPeer reviewedPublisher PD
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