129 research outputs found
Stability and sensitivity characteristic analysis for the hydropower unit considering the sloping roof tailrace tunnel and coupling effect of the power grid
This paper focuses on the stability and dynamic characteristics of the coupled system of nonlinear hydraulic turbine regulating system (HTRS) and power grid (PG). By establishing a nonlinear mathematical model considering the downstream surge chamber and sloping roof tailrace tunnel, the coupling effect and influence mechanism between the hydropower station and power grid are revealed. First, with regard to the coupled system, HTRS considering downstream surge chamber and sloping roof tailrace tunnel and PG model is established. Then, dynamic performance of the coupled system is investigated based on the nonlinear mathematical model as well as Hopf bifurcation theory and validated by numerical simulation. Meanwhile, the impact mechanism of HTRS and PG is revealed by investigating dynamic characteristics. In addition, stability is studied by using eigenvalue method according to the Jacobian matrix of the coupled system. Finally, parameter sensitivity is investigated to quantify parameter effects on system performance. The experimental results indicate that bifurcation line divides the whole proportionalāintegral adjustment coefficient plane into two parts and the region at the bottom of bifurcation line is stability region. HTRS and PG possess a coupling effect on stable domain and dynamic properties of the coupled system. The variation of HTRS parameters is most significant for the coupled system, especially for the inertia time constant of the hydraulic turbine unit and penstock flow inertia time constant
The nanohertz stochastic gravitational-wave background from cosmic string Loops and the abundant high redshift massive galaxies
Very recently, the Pulsar Timing Array (PTA) experiments reported strong
evidence for the presence of the nanohertz stochastic gravitational wave
background (SGWB). In this work we show that the cosmic string loops can
account for the nanohertz SGWB data with a and the
loops number density . Though the presence of cosmic string
loops can also effectively enhance the number density of massive galaxies at
high redshifts, we do not find a reasonable parameter space to
self-consistently interpret both the SGWB data and the JWST observations. This
implies either an extension of the model adopted in this work or the different
physical origins of these two phenomena
IDENTIFICATION AND RECOGNIZATION OF BAMBOO BASED ON CROSS-SECTIONAL IMAGES USING COMPUTER VISION
Identiļ¬cation of bamboo is of great importance to its conservation and uses. However, identify bamboo manually is complicated, expensive, and time-consuming. Here, we analyze the most evident and characteristic anatomical elements of cross section images, thatās a particularly vital breakthrough point. Meanwhile, we present a novel approach with respect to the automatic identiļ¬cation of bamboo on the basis of the cross-sectional images through computer vision.Two diverse transfer learning strategies were applied for the learning process, namely ļ¬ne-tuning with fully connected layers and all layers, the results indicated that ļ¬ne-tuning with all layers being trained with the dataset consisting of cross-sectional images of bamboo is an effective tool to identify and recognize intergenericbamboo, 100% accuracy on the training dataset was achieved while 98.7% accuracy was output on the testing dataset, suggesting the proposed method is quite effective and feasible, itās beneļ¬cial to identify bamboo and protect bamboo in coutilization. More collection of bamboo species in the dataset in the near futuremight make Efļ¬cientNet more promising for identifying bamboo.
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Primordial magnetic field as a common solution of nanohertz gravitational waves and Hubble tension
The origin of interstellar and intergalactic magnetic fields is largely
unknown, and the primordial magnetic fields (PMFs) produced by, e.g., phase
transitions of the early Universe are expected to provide seeds for those
magnetic fields. The PMFs affect the evolution of the Universe at an early
time, resulting in a series of phenomena. In this work, we show that the
PMF-induced turbulence can give rise to nanohertz (nHz) gravitational waves
reported by several pulsar timing arrays, including NANOGrav, PPTA, EPTA, and
CPTA. Using the nHz gravitational wave data, we obtain the constraints on the
characteristic magnetic field strength () and coherent length scale () of PMFs, assuming a generation temperature of
approximately the QCD temperature ( MeV). In addition, the PMFs which
evolve to the recombination era can induce baryon density inhomogeneities, and
then alter the ionization process. This naturally results in an alleviation of
the tension of the Hubble parameter and the matter clumpiness parameter
between early and late-time measurements. Assuming an evolution form of
from the epoch of the production of
PMFs to the epoch of recombination, we find (95\% credible
region).Comment: 7 pages, 4 figure
Potential roles of non-lymphocytic cells in the pathogenesis of IgG4-related disease
Studies have confirmed the involvement of a variety of lymphocyte subsets, including type 2 helper T lymphocytes (Th2) and IgG4+ B lymphocytes, in the pathogenesis of IgG4-related disease (IgG4-RD). Those lymphocytes contribute to the major pathogenetic features of IgG4-RD. However, they are not the only cellular components in the immunoinflammatory environment of this mysterious disease entity. Recent studies have suggested that various non-lymphocytic components, including macrophages and fibroblasts, may also play an important role in the pathogenetic process of IgG4-RD in terms of contributing to the chronic and complex progress of the disease. Therefore, the potential role of non-lymphocyte in the pathogenesis of IgG4-RD is worth discussing
Performance Diagnosis and Analysis of a Thermal Power Turbine Unit in a Power Plant
In order to further improve the operation level of the provincial grid direct thermal power units, optimize the data quality of the provincial thermal power unit system, diagnose and analyze the operation data of the thermal power unit system, and comprehensively analyze and evaluate the unit regulation ability from the aspects of heating capacity, the minimum startup mode of the whole plant, and the load capacity of the heating state, so as to provide support for the accurate scheduling of the unit
Anthropomorphic Dual-Arm Coordinated Control for a Single-Port Surgical Robot Based on Dual-Step Optimization
Effective teleoperation of the small-scale and highly-integrated robots for single-port surgery (SPS) imposes unique control and human-robot interaction challenges. Traditional isometric teleoperation schemes mainly focus on end-to-end trajectory mapping, which is problematic when applied to SPS robotic control, especially for dual-arm coordinated operation. Inspired by the human arm configuration in boxing maneuvers, an optimized anthropomorphic coordinated control strategy based on a dual-step optimization approach is proposed. Theoretical derivation and solvability of the problem are addressed, and the effectiveness of the method is further demonstrated in detailed simulation and in-vitro experiments. The proposed control strategy has been shown to perform dexterous SPS bimanual manipulation more effectively, involving less instrument-interference and is free from singularities, thereby improving the safety and efficiency of SPS operations
Analysis of Heating Transformation of Nuclear Power Units
Under the current national conditions and policy support, nuclear heating has flourished. Domestic nuclear power units mainly generate electricity, and nuclear heating as a clean energy source is one of the main ways to solve winter heating in the north. This paper first compares and analyzes the two different ways of nuclear heating, then takes the nuclear heating of Haiyang Nuclear Power Station as an example, based on the mature experience of steam extraction heating transformation of thermal power units, makes an economic analysis on the steam extraction transformation of PWR nuclear power units from the characteristics of the thermal system combined with the Spot market, and finally makes an economic evaluation on the Cogeneration nuclear power units
Robust estimation of bacterial cell count from optical density
Optical density (OD) is widely used to estimate the density of cells in liquid culture, but cannot be compared between instruments without a standardized calibration protocol and is challenging to relate to actual cell count. We address this with an interlaboratory study comparing three simple, low-cost, and highly accessible OD calibration protocols across 244 laboratories, applied to eight strains of constitutive GFP-expressing E. coli. Based on our results, we recommend calibrating OD to estimated cell count using serial dilution of silica microspheres, which produces highly precise calibration (95.5% of residuals <1.2-fold), is easily assessed for quality control, also assesses instrument effective linear range, and can be combined with fluorescence calibration to obtain units of Molecules of Equivalent Fluorescein (MEFL) per cell, allowing direct comparison and data fusion with flow cytometry measurements: in our study, fluorescence per cell measurements showed only a 1.07-fold mean difference between plate reader and flow cytometry data
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