27,872 research outputs found
q-Differential equations for q-classical polynomials and q-Jacobi-Stirling numbers
No full textWe introduce, characterise and provide a combinatorial interpretation for the so-called q-Jacobi–Stirling numbers.
This study is motivated by their key role in the (reciprocal) expansion of any power of a second order
q-differential operator having the q-classical polynomials as eigenfunctions in terms of other even order operators,
which we explicitly construct in this work. The results here obtained can be viewed as the q-version of
those given by Everitt et al. and by the first author, whilst the combinatorics of this new set of numbers is a
q-version of the Jacobi–Stirling numbers given by Gelineau and the second author
Corruption induced energy inefficiencies: Evidence from China's energy investment projects
No full textChina is currently having a lot of conversations about energy and corruption. This research explores how corruption and energy investment affect energy efficiency by employing statistical methodologies and analyzing data spanning from 2000 to 2017. The research findings indicate that corruption has a detrimental effect on energy efficiency. Further analysis reveals that energy investment acts as a mediator in this relationship. The influence of corruption on energy efficiency varies depending on the endowment of energy resources and the level of performance pressure. Regions with lower endowments of energy resources experience a greater detrimental impact of corruption on energy efficiency. However, in regions with higher endowments of energy resources, energy investment has a complete mediating effect. In regions with lower performance pressure, corruption significantly reduces energy efficiency, whereas, in regions with higher performance pressure, the mediating role of energy investment is more prominent. The approval system reform in the energy investment sector since 2013 has reduced the adverse impact of corruption on energy investment and, consequently, on energy efficiency. These research findings offer valuable insights for the Chinese government to address shortcomings, combat corruption in the energy sector, optimize energy investment, and enhance energy efficiency further
Effect of dynamic windblown sand environments on the wear and damage of wheel-rail under different slip ratios
No full textAlthough the railways in windblown sand areas has been continuously developed in recent years, the effect of dynamic windblown sand environment on the wear and damage of wheel-rail under different slip ratios is still unclear. This work focused on the effect of Gobi and desert dynamic windblown sand environments on the wear and damage behaviors of wheel-rail under different slip ratios using a twin-disc rolling contact fatigue machine. The corresponding experiments in dry condition (without wind and sand) were also performed for comparison. The results indicated that in these three conditions (Gobi, desert and dry), their trends of adhesion coefficient with slip ratio were not exactly the same. The wear rate of wheel and rail in these three conditions could be ranked as: dry > desert > Gobi. As the slip ratio increased, the fatigue wear of wheel and rail gradually aggravated. Furthermore, the oxidative wear of wheel also gradually exacerbated, especially in Gobi dynamic windblown sand environment. Based on the results of experiments and finite element simulations, the interaction mechanism between sand and wheel-rail interface was proposed and the reasons for wear reduction in dynamic windblown sand environments were summarized
A biomimetic model reaction for the extradiol catechol dioxygenases
No full textA model reaction is described for extradiol catechol cleavage involving FeCl2 or FeCl3, 1,4,9-triazacyclononane (TACN), pyridine and dioxygen which shows similar cofactor and regio-selectivity to the extradiol catechol dioxygenases
Modification of Loop 1 Affects the Nucleotide Binding Properties of Myo1c, the Adaptation Motor in the Inner Ear
No full textMyo1c is one of eight members of the mammalian myosin I family of actin-associated molecular motors. In stereocilia of the hair cells in the inner ear, Myo1c presumably serves as the adaptation motor, which regulates the opening and closing of transduction channels. Although there is conservation of sequence and structure among all myosins in the N-terminal motor domain, which contains the nucleotide- and actin-binding sites, some differences include the length and composition of surface loops, including loop 1, which lies near the nucleotide-binding domain. To investigate the role of loop 1, we expressed in insect cells mutants of a truncated form of Myo1c, Myo1c1IQ, as well as chimeras of Myo1c1IQ with the analogous loop from other myosins. We found that replacement of the charged residues in loop 1 with alanines or the whole loop with a series of alanines did not alter the ATPase activity, transient kinetics properties, or Ca2+ sensitivity of Myo1c1IQ. Substitution of loop 1 with that of the corresponding region from tonic smooth muscle myosin II (Myo1c1IQ-tonic) or replacement with a single glycine (Myo1c1IQ-G) accelerated the release of ADP from A.M 2?3-fold in Ca2+, whereas substitution with loop 1 from phasic muscle myosin II (Myo1c1IQ-phasic) accelerated the release of ADP 35-fold. Motility assays with chimeras containing a single ?-helix, or SAH, domain showed that Myo1cSAH-tonic translocated actin in vitro twice as fast as Myo1cSAH-WT and 3-fold faster than Myo1cSAH-G. The studies show that changes induced in Myo1c via modification of loop 1 showed no resemblance to the behavior of the loop donor myosins or to the changes previously observed with similar Myo1b chimeras
sj-docx-1-jdr-10.1177_00220345221130013 – Supplemental material for Preliminary Extracellular Vesicle Profiling in Drainage Fluid After Neck Dissection in OSCC
No full textSupplemental material, sj-docx-1-jdr-10.1177_00220345221130013 for Preliminary Extracellular Vesicle Profiling in Drainage Fluid After Neck Dissection in OSCC by J. Wang, Q.-W. Man, Q.-Y. Fu, N.-N. Zhong, H.-Q. Wang, S.-R. Li, X. Gao, H. Lin, F.-C. Su, L.-L. Bu, G. Chen and B. Liu in Journal of Dental Research</p
Mid-infrared electroluminescence at room temperature from InAsSb multi-quantum well light emitting diodes
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