Versatile soliton emission from a WS2 mode-locked fiber laser

Recently, few-layer tungsten disulfide (WS2), as a shining 2D material, has been discovered to possess both the saturable absorption ability and large nonlinear refractive index. Here, we demonstrate versatile soliton pulses in a passively mode-locked fiber laser with a WS2-deposited microfiber. The few-layer WS2 is prepared by the liquid-phase exfoliation method and transferred onto a microfiber by the optical deposition method. Study found, the WS2-deposited microfiber can operate simultaneously as a mode-locker and a high-nonlinear device. In experiment, by further inserting the WS2 device into the fiber laser, besides the dual-wavelength soliton, noise-like soliton pulse, conventional soliton and its harmonic form are obtained by properly adjusting the pump strength and the polarization states. For the dual-wavelength soliton pulses and noise-like pulse, the maximum output power of 14.2 mW and pulse energy of 4.74 nJ is obtained, respectively. In addition, we also achieve the maximum harmonic number (135) of conventional soliton, corresponding to a repetition rate of ∼497.5 MHz. Our study shows clearly that WS2-deposited microfiber can be as a high-nonlinear photonic device for studying a plenty of nonlinear soliton phenomena

2,2,2-Trifluoro­ethyl 4-methyl­benzene­sulfonate

In the crystal structure of the title compound, C9H9F3O3S, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules along the c-axis direction. Also present are slipped π–π stacking inter­actions between phenyl­ene rings, with perpendicular inter­planar distances of 3.55 (2) Å and centroid–centroid distances of 3.851 (2) Å

Methyl 2-amino-5-chloro­benzoate

The title compound, C8H8ClNO2, is almost planar, with an r.m.s. deviation of 0.0410 Å from the plane through the non-hydrogen atoms. In the crystal structure, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into chains along the b axis. An intra­molecular N—H⋯O hydrogen bond results in the formation of a six-membered ring

A Comparative Transcriptome and Proteome Analysis in Rat Models Reveals Effects of Aging and Diabetes on Expression of Neuronal Genes

SummaryBackgroundTo understand neuronal molecular changes in senile diabetes we established a rat senile diabetes model and analyzed transcriptome and proteome changes.MethodsWistar rats were fed a high sugar, high fat diet for 16 months to induce diabetes. Non-diabetic aged rats and young rats were used as controls. Transcript and protein levels in the liver were then analyzed by microarray and antibody arrays, respectively.ResultsNeuronal genes that were differentially expressed between senile diabetic rats, non-diabetic aged rats, and young rats were distributed across 12 pathways and 23 Gene Ontology (GO) clusters. Among them, 2267 genes were aging-related, 1230 genes were diabetes-associated, and 9 proteins might be associated with neurological disorders.ConclusionIn this study, we investigated transcriptome and proteome changes in animal models, analyzed the impact of aging and diabetes on neuronal molecules, and confirmed the correlations. Our study provides support for further studies on mechanisms of neuronal diseases

Quantum sensing of temperature close to absolute zero in a Bose-Einstein condensate

We propose a theoretical scheme for quantum sensing of temperature close to absolute zero in a quasi-one-dimensional Bose-Einstein condensate (BEC). In our scheme, a single-atom impurity qubit is used as a temper-ature sensor. We investigate the sensitivity of the single-atom sensor in estimating the temperature of the BEC. We demonstrate that the sensitivity of the temperature sensor can saturate the quantum Cramer-Rao bound by means of measuring quantum coherence of the probe qubit. We study the temperature sensing performance by the use of quantum signal-to-noise ratio (QSNR). It is indicated that there is an optimal encoding time that the QSNR can reach its maximum in the full-temperature regime. In particular, we find that the QSNR reaches a finite upper bound in the weak coupling regime even when the temperature is close to absolute zero, which implies that the sensing-error-divergence problem is avoided in our scheme. Our work opens a way for quantum sensing of temperature close to absolute zero in the BEC.Comment: 9 pages,9 figure

2-Methyl-4-(2-methyl­benzamido)­benzoic acid

In the crystal structure of the title compound, C16H15NO3, inter­molecular N—H⋯O hydrogen bonds link the mol­ecules into chains parallel to the b axis and pairs of inter­molecular O—H⋯O hydrogen bonds between inversion-related carb­oxy­lic acid groups link the mol­ecules into dimers. The dihedral angle between the two benzene rings is 82.4 (2)°

Methyl 4-(3-chloro­prop­oxy)benzoate

In the crystal structure of the title compound, C11H13ClO3, inter­molecular C—H⋯O hydrogen bonds link the mol­ecules into zigzag chains along the c axis

Methyl 5-chloro-2-[N-(3-eth­oxy­carbonyl­prop­yl)-4-methyl­benzene­sulfonamido]­benzoate

In the title compound, C21H24ClNO6S, the benzene rings are oriented at a dihedral angles of 41.6 (2)°. In the crystal structure, weak inter­molecular C—H⋯O inter­actions link the mol­ecules