1,646 research outputs found
Effects of -wave Interactions on Borromean Efimov Trimers in Heavy-Light Fermi Systems
We investigate the effects of -wave interactions on Efimov trimers in
systems comprising two identical heavy fermions and a light particle, with mass
ratios larger than . Our focus lies on the borromean regime where the
ground-state trimer exists in the absence of dimers. Using pair-wise
Lennard-Jones potentials and concentrating on the symmetry,
we explore the critical value of the interspecies -wave scattering length
at which the borromean state appears in several two-component particle
systems. We study the universal properties of and the influence of
-wave fermion-fermion interactions on its value. Our findings show that, in
the absence of -wave fermion-fermion interactions, is universally
determined by the van der Waals radius and mass ratio. However, when attractive
interactions between the two fermions are introduced, the formation of the
borromean state becomes favored over the absence of -wave fermion-fermion
interaction. Furthermore, we demonstrate that the -wave Efimov effects
persist even when the fermion-fermion interaction is taken to the -wave
unitary limit
Two new species of the genus Stenus Latreille from China (Coleoptera: Staphylinidae: Steninae)
Two new species of the genus Stenus Latreille (subgenus Stenus s. str.) are described: Stenus (s. str.) affinisecretus, sp. n., from Beijing, and S. (s. str.) guandiensis, sp. n., from Shanxi, China. These two new species were collected in the mountain areas. Important morphological characters, like those of hind wings, 8th and 9th abdominal sternites of male, and the aedeagus are illustrated for the new species. All the types are deposited in the Institute of Zoology, Chinese Academy of Sciences, Beijing
Assessment of the key aroma compounds in rose-based products
AbstractIn this study, headspace solid phase microextraction–gas chromatography-mass spectrometry and GC-olfactometry were used to analyze the key aroma compounds in three types of rose-based products, including low-temperature extracts (LTEs), high-temperature extracts (HTEs), and rose drinks (RDs). In combination with the Guadagni theory, it was confirmed that the key aroma components of LTE were β-phenyl ethyl alcohol, citronellol, geraniol, and eugenol. The main aroma compounds in HTE were β-phenyl ethyl alcohol, citronellol, geraniol, eugenol, linalool, and rose oxide. The four key aroma compounds in RDs were β-phenyl ethyl alcohol, eugenol, geraniol, and linalool
First complete mitochondrial genome of the tribe Coccini (Hemiptera, Coccomorpha, Coccidae) and its phylogenetic implications
Soft scale insects (Hemiptera, Coccidae) are important pests of various agricultural and horticultural crops and ornamental plants. They have negative impacts on agriculture and forestry. The tribe Coccini represents one of the most ancient evolutionary lineages of soft scale insects. However, no complete Coccini mitochondrial genome (mitogenome) is available in public databases. Here, we described the complete mitogenome of Coccus hesperidum L., 1758. The 15,566 bp mitogenome of C. hesperidum had a high A+T content (83.4%) and contained a typical set of 37 genes, with 13 protein-coding genes (PCGs), 22 transfer RNA genes (tRNAs) and two ribosomal RNA genes (rRNAs). Only seven tRNAs had the typical clover-leaf secondary structure and the remaining tRNAs lacked the DHU arm, TψC arm or both. Moreover, a comparative analysis of all reported scale insect mitogenomes from GenBank database was performed. The mitogenomes of scale insects showed high similarities in base composition and A+T content. Additionally, our phylogenetic analysis confirmed the monophyly of Coccomorpha and revealed that the archaeococcoids were the most basal lineage within Coccomorpha, while Ericerus pela and Didesmococcus koreanus, belonging to Coccidae, were often mixed with Aclerdidae, making Coccidae a paraphyletic group. These findings expand the mitogenome database of scale insects and provide new insights on mitogenome evolution for future studies across different insect groups
Entropy of black holes in the deformed Ho\v{r}ava-Lifshitz gravity
We find the entropy of Kehagias-Sfetsos black hole in the deformed
Ho\v{r}ava-Lifshitz gravity by using the first law of thermodynamics. When
applying generalized uncertainty principle (GUP) to Schwarzschild black hole,
the entropy may be interpreted as the GUP-inspired
black hole entropy. Hence, it implies that the duality in the entropy between
the Kehagias-Sfetsos black hole and GUP-inspired Schwarzschild black hole is
present.Comment: 11 pages, version to appear in PL
A String-Inspired Quintom Model Of Dark Energy
We propose in this paper a quintom model of dark energy with a single scalar
field given by the lagrangian . In the limit of 0 our model reduces to the
effective low energy lagrangian of tachyon considered in the literature. We
study the cosmological evolution of this model, and show explicitly the
behaviors of the equation of state crossing the cosmological constant boundary.Comment: 6 pages, 4 figures, accepted by PL
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Synthesis, Characterization, and Utilization of a Lignin-Based Adsorbent for Effective Removal of Azo Dye from Aqueous Solution
How to effectively remove toxic dyes from the industrial wastewater using a green low-cost lignocellulose-based adsorbent, such as lignin, has become a topic of great interest but remains quite challenging. In this study, cosolvent-enhanced lignocellulosic fractionation (CELF) pretreatment and Mannich reaction were combined to generate an aminated CELF lignin which is subsequently applied for removal of methylene blue and direct blue (DB) 1 dye from aqueous solution. 31P NMR was used to track the degree of amination, and an orthogonal design was applied to determine the relationship between the extent of amination and reaction parameters. The physicochemical, morphological, and thermal properties of the aminated CELF lignin were characterized to confirm the successful grafting of diethylenetriamine onto the lignin. The aminated CELF lignin proved to be an effective azo dye-adsorbent, demonstrating considerably enhanced dye decolorization, especially toward DB 1 dye (>90%). It had a maximum adsorption capacity of DB 1 dye of 502.7 mg/g, and the kinetic study suggested the adsorption process conformed to a pseudo-second-order kinetic model. The isotherm results also showed that the modified lignin-based adsorbent exhibited monolayer adsorption. The adsorbent properties were mainly attributed to the incorporated amine functionalities as well as the increased specific surface area of the aminated CELF lignin
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