The circumstances of some roads in Changsha city,the lowaltitude TSP pollution of some roads,dust-retention effect and soil erosion of plants were investigated.A numerical assessment on green area of low quality was conducted.The low-altitude TSP of some roads and the amount of dust-retention in green areas in the city was measured.The research showed that green areas of low quality had a direct relationship with the pollution caused by atmospheric particulate matter(r =0.75).Meanwhile,the amount of soil erosion of green areas in Changsha,which is the main source of the pollution caused by atmospheric particulate matter,was calculated,and the sum was about 90 ton per year,which mainly results in atmospheric particulate pollution.
Abstract Background: Lower-risk myelodysplastic syndrome (MDS) is characterized by the presence of dysplasia, low bone marrow blast percentage, low number and depth of cytopenia(s), and relatively good-risk karyotpic and molecular abnormalities. Lower-risk MDS patients have primarily received supportive care, immunomodulators, and immunosuppressants. New effective regimens or drugs are urgently needed for the treatment of lower-risk MDS owing to the unsatisfactory clinical efficacy. Sanzi-huangshi pill is an arsenic-containing Chinese medicine that has been used as a promising drug for MDS for decades, but its efficacy has not yet been proven by high-quality clinical trial. Methods: SPIRIT guidelines were followed in drafting this protocol for a randomized controlled multicenter trial. Ninety-two adults with lower-risk MDS are randomly assigned in a 1:1 ratio to Sanzi-huangshi pill group or control group, and all participants are required to receive 6 months of intervention and 18 months of observation. The primary outcome is Overall Response Rate defined as the sum of complete remission, partial remission, cytogenetic complete remission and hematologic improvement accounting for the proportion of total evaluable cases. Discussion: This is the first randomized controlled trial to evaluate the efficacy and safety of arsenic-containing Chinese medicine as an adjuvant therapy in lower-risk MDS with serum erythropoietin (sEPO) >500 IU/ml. The purpose of this study is to correctly evaluate the position of traditional Chinese medicine in the treatment plan of MDS and to formulate an effective regimen of integrated Traditional Chinese and Western Medicine to provide preliminary clinical evidence. Clinical Trial Registration: http://www.chictr.org.cn, identifier: ChiCTR2200064230, Registered September 30, 2022.
Owing to its good anti-jamming capability and the property of low probability of intercept,the phase-coding signal is widely applied in radar waveform generation.This paper gives out the characteristics of phase-coding signal in time-domain and frequency-domain,analyzes the signal characteristics by means of the fuzzy function and finds that the signal has high resolution of the distance and the velocity,analyzes the process and result of this kind of signal being matched filtering compressed,discusses the design of the time-domain side-lobe suppression filter adopting phase-coding signal with large time-band width product,and provides the engineering realization method.
The relationship between saponin content of Panax quinquefolius in different parts of the organization and expression of ginsenoside biosynthesis related gene was obtained by the correlation analysis between saponin content and gene expression. The 14 tissue parts of P. quinquefolius were studied, six saponins in P. quinquefolius. Samples (ginsenoside Rg₁, Re, Rb₁, Rc, Rb₂ and Rd), group saponins and total saponins were determined by high performance liquid chromatography and vanillin-sulfuric acid colorimetric method. Simultaneously, the expression levels of 7 ginsenoside biosynthesis related genes (SQS, OSC, DS, β-AS, SQE, P450 and FPS) in different tissues of P. quinquefolius were determined by Real-time fluorescence quantitative PCR. Although 7 kinds of ginsenoside biosynthesis related enzyme gene in the P. quinquefolius involved in ginsenoside synthesis, the expression of β-AS and P450 genes had no significant effect on the content of monosodium saponins, grouping saponins and total saponins, FPS, SQS, OSC, DS and SQE had significant or extremely significant on the contents of single saponins Re, Rg1, Rb1, Rd, group saponin PPD and PPT, total saponin TMS and total saponin TS (P<0.05 or P<0.01). The biosynthesis of partial saponins, grouping saponins and total saponins in P. quinquefolius was affected by the interaction of multiple enzyme genes in the saponin synthesis pathway, the content of saponins in different tissues of P. quinquefolius was determined by the differences in the expression of key enzymes in the biosynthetic pathway. Therefore, this study further clarified that FPS, SQS, OSC, DS and SQE was the key enzyme to control the synthesis of saponins in P. quinquefolius by correlation analysis, the biosynthesis of ginsenosides in P. quinquefolius was regulated by these five kind of enzymes in cluster co-expression of interaction mode.
On July 6, 2009, the world's first commercial single compressed natural gas (CNG) fueled ship, M.V. NP Jenjosh—the first of 12 contracted vessels built in Dajiang and Hongyu shipyards located in Wuhu city of Anhui Province, P.R. China and classed to China Classification Society (CCS)—was delivered to the owner, Jenjosh Group based in Thailand. This paper contains some technical discussions that took place during the class plan review of the subject vessels, including: hull technical practices, machinery, and electrical technical practices, and also discusses designing the similar CNG fueled ships and developing the international gas-fueled (IGF) ship code in future. Finally, this paper draws conclusions and looks forward to the future practice of the CNG fueled ship.
Abstract Film cooling is an important cooling technique used in modern gas turbines and air engines. It is a typical jet-in-cross-flow problem, where the jet interacts with the mainstream, leading to complex vortex structures and turbulence properties. In this paper, the deviation between RANS and LES data and the turbulent heat transport of film cooling problems are focused. A data-driven framework based on the physics-informed neural network (PINN) is proposed and used to calculate the distribution of the turbulent Prandtl number (Prt) based on the RANS flow field and the LES temperature field. This Prt is the target of a turbulence heat transport model, and the distribution of this Prt is analyzed in a wide range of film cooling flow conditions. A series of film cooling problems are studied with the variation of the hole geometry, the mainstream Mach number, and the blowing ratio. Results show that the turbulent Prandtl number largely deviates from the default value of 0.85 in most CFD solvers in all flow conditions and different turbulence models also lead to different Prt values, which means the turbulent heat transport model of Prt should be turbulence-model-related.
The four-switch Buck-Boost (FSBB) converter, with advantages such as bidirectional power transmission and low switch stress, has been widely applied in various fields including photovoltaic power generation and energy storage. This paper addresses the problem of the complex working mode of the FSBB converter and the small sample size of fault samples by using the support vector machines (SVM) model for fault diagnosis. By selecting signal acquisition nodes and using Fast Fourier Transform (FFT) to extract fault features, the improved grid search method is used to find the optimal parameters of the SVM model. Finally, the SVM model is used for multi-class recognition to achieve effective diagnosis of single-switch open circuit faults and double-switch open circuit faults of the FSBB converter under different modes. Simulation results show that this method has a high diagnostic accuracy and strong extrapolation ability.
A judicious modification of the buried interface can enhance the quality of perovskite films and reduce non‐radiative recombination losses, particularly in methylammonium (MA)‐free perovskite solar cells (PSCs). In this study, the ionic‐liquid 1,3‐dimethylimidazolium methanesulfonate (DMIMMeSO 4 ) is employed, characterized by its high ionic conductivity and excellent thermal stability, to regulate the perovskite/SnO 2 interface. The nitrogen component in DMIMMeSO 4 can interact with Sn 4+ through Lewis acid–base interactions, effectively passivating defects associated with tin and suppressing the formation of oxygen vacancies, leading to reduced non‐radiative recombination of charge carriers. In addition, [MeSO 4 ] − can also form coordination bonds with PbI 2 , creating a better perovskite film with smoothed interface. Moreover, DMIMMeSO 4 also optimize the energy‐level alignment, thereby reducing the charge‐transfer barrier and enhancing charge‐extraction efficiency. As a result, power conversion efficiency of 23.91% is achieved by MA‐free PSCs modified with DMIMMeSO 4 . Furthermore, after 1000 h of ambient air storage, devices that are not encapsulated maintaine over 90% efficiency. In all of these results, it is clearly indicated that interface modulation based on ionic‐liquid‐assisted smoothed‐interface engineering is an effective approach for obtaining high‐performance PSCs.
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