Journal of Russian Laser Research - We demonstrate a mid-infrared (mid-IR) ZnGeP2 (ZGP) rectangle ring optical parametric oscillator (OPO) pumped by an actively/passively Q-switched polycrystalline... 相似文献
The theoretical predictions and experimental synthesis of H3S and LaH10 superconductors with record high superconducting transition temperatures (Tc) have promoted the hydrogen-based superconducors to be a research hotspot in the field of solid-state physics. Here, we predict an unprecedented layered structure CaH15, with high Tc of 189 K at 200 GPa using ab initio calculations. As concerns the novel structure, one layer is made of a hydrogen nonagon, the other layer consists of a Ca atom and six H2 molecular units surrounding the Ca atom. This layered structure was also found in SrH15, YH15, and LaH15 at high pressures, each materials exhibit high Tc especially YH15 can reach above 200 K at 220 GPa. It represents the second class of layered superhydrides with high value of Tc after pentagraphene like HfH10. 相似文献
Formation flight for unmanned aerial vehicles (UAVs) is a rather complicated global optimum problem. In the global optimum problem, the complex relationship between the controller parameters and the performance index, and the different kinds of constrains under complex combat field environment are taken into account. Brain storm optimization (BSO) is a brand-new swarm intelligence optimization algorithm inspired by a human being’s behavior of brainstorming. In this paper, in allusion to the drawbacks that the basic BSO algorithm traps into local optimum easily and has a slow convergent speed, some novel designs are proposed to enhance the performance of the optimization algorithm. The modified BSO is applied to solve the optimization problem based on the nonlinear Receding horizon control (RHC) mode of UAVs to seek the RHC control parameters for UAV formation flight. Series of comparative experimental results are presented to show the feasibility, validity, and superiority of our proposed method. 相似文献
New amphiphilic gelators that contained both Schiff base and L-glutamide moieties, abbreviated as o-SLG and p-SLG, were synthesized and their self-assembly in various organic solvents in the absence and presence of metal ions was investigated. Gelation test revealed that o-SLG formed a thermotropic gel in many organic solvents, whilst p-SLG did not. When metal ions, such as Cu(2+), Zn(2+), Mg(2+), Ni(2+), were added, different behaviors were observed. The addition of Cu(2+) induced p-SLG to from an organogel. In the case of o-SLG, the addition of Cu(2+) and Mg(2+) ions maintained the gelating ability of the compound, whilst Zn(2+) and Ni(2+) ions destroyed the gel. In addition, the introduction of Cu(2+) ions caused the nanofiber gel to perform a chiral twist, whilst the Mg(2+) ions enhanced the fluorescence of the gel. More interestingly, the Mg(2+)-ion-mediated organogel showed differences in the fluorescence quenching by D- and L-tartaric acid, thus showing a chiral recognition ability. 相似文献
Geissoschizine methyl ether (1), a newly discovered strong acetylcholinesterase (AChE) inhibitor, along with six weakly active alkaloids, vallesiachotamine (2), hisuteine (3), hirsutine (4), isorhynchophylline (5), cisocorynoxeine (6) and corynoxeine (7) have been isolated from Uncaria rhynchophylla. Geissoschizine methyl ether (1) inhibited 50% of AChE activity at concentrations of 3.7?±?0.3?μg?mL(-1) while the IC(50) value of physostigmine as a standard was 0.013?±?0.002?μg?mL(-1). The mode of AChE inhibition by 1 was reversible and non-competitive. In addition, molecular modelling was performed to explore the binding mode of inhibitor 1 at the active site of AChE. 相似文献
CDDP is loaded into methoxypoly(ethylene glycol)‐block‐poly(L ‐glutamic acid) (mPEG‐b‐PLG), and a combination with iRGD is applied for NSCLC chemotherapy. The CDDP‐loaded micelles show sustained cisplatin release in PBS, dose‐ and time‐dependent inhibition to HeLa and A549 cell proliferation, and no apparent hemolysis activities. In in vivo studies using subcutaneous NSCLC xenograft models (A549), both free CDDP and CDDP‐loaded micelles show an evident anti‐tumor effect. However, the toxicity of CDDP is significantly reduced in the cases of CDDP‐loaded micelles and co‐administration with iRGD, and the survival time is prolonged by over 30%. Therefore, mPEG‐b‐PLG‐loaded cisplatin and the combination with iRGD provides a promising new therapy for NSCLC.
A novel semiconducting oligo(9‐fluorenylideneacetic acid) (OFYA) with good redox activity and stability was successfully electrosynthesized by direct anodic oxidation of 9‐fluorenylideneacetic acid (FYA) in CH2Cl2 containing boron trifluoride diethyl etherate (BFEE) as the supporting electrolyte. The as‐formed OFYA film was readily soluble in dimethyl sulfoxide and tetrahydrofuran, and partly soluble in water, alcohol, acetonitrile and acetone. FT‐IR and 1H NMR spectra, together with computational results proved that FYA was probably polymerized through the coupling at C(2) and C(7) positions. Further, OFYA was a typical green light‐emitter with maximal emission at 555 nm and its fluorescence quantum yield was distinctly improved in comparison with that of the monomer. The oligomer was also studied by UV‐vis spectroscopy, MALDL‐TOF mass spectrometry, and thermal analysis, respectively. 相似文献