High-frequency compensation for seismic data based on adaptive generalized S transform

The low-pass fi ltering eff ect of the Earth results in the absorption and attenuation of the high-frequency components of seismic signals by the stratum during propagation.Hence,seismic data have low resolution.Considering the limitations of traditional high-frequency compensation methods,this paper presents a new method based on adaptive generalized S transform.This method is based on the study of frequency spectrum attenuation law of seismic signals,and the Gauss window function of adaptive generalized S transform is used to fi t the attenuation trend of seismic signals to seek the optimal Gauss window function.The amplitude spectrum compensation function constructed using the optimal Gauss window function is used to modify the time-frequency spectrum of the adaptive generalized S transform of seismic signals and reconstruct seismic signals to compensate for high-frequency attenuation.Practical data processing results show that the method can compensate for the high-frequency components that are absorbed and attenuated by the stratum,thereby eff ectively improving the resolution and quality of seismic data.

Analysis on Interaction Effects Between Variety and Site of Silage Maize Regional Test in Guizhou Province

Taking the yield in the second group of Guizhou silage maize regional test in 2019 as data information, 8 experimental sites and 12 silage maize varieties as experimental objects, the interaction effect between gene and environment was analyzed by using AMMI model. The results showed that the average fresh weight yield of each variety was 3 199.5~3 976.6 kg/667m^(2), among them, 5 varieties had an increase in the yield. Variety variation accounted for 10.51% of the total variation;experimental site variation accounted for 63.22% of the total variation;interaction effect variation between gene and environment accounted for 26.28% of the total variation;IPCA1 and IPCA2 variation accounted for 50.7% and 31.2% of the interaction variation, respectively;IPCA3 variation accounted for 7.25% of the interaction variation. g_4, g_8, g_9, g_10, g_11 and g_12 had better adaptability to e_1, e_2, e_6 and e_7;while g_1, g_2, g_3, g_5, g_6 and g_7 had better adaptability to e_3, e_4, e_5 and e_8. In consideration of yield, g_1(Huinongqing 2) and g_9(Xinyu 666) were silage maize varieties with high and stable yield;g_3(Hemuyu 905), g_8(Wuhuayu 3) and g_11(Liangdu 191) had general stability, and their yield was higher than that of the control;g_12(Jinduyu 999) had the worst stability and low yield.

8RB-125型人力泵技术参数的水力学分析

本文对8RB-125型人力泵进行水力计算，目的是通过水力学分析，给出合理的主要技术参数。

Research on Propagation Characteristics of DifferentIsolates of Porcine Circovirus Type 2 in vivo

[Objective]The aim of this study is to explore the dynamic changes of Porcine circovirus type 2 (PCV2) and the propagation differences between different PCV2 strains.[Method]A rapid, sensitive and SYBR Green I-based real-time quantitative PCR assay was developed to detect PCV2 in mice. The Balb/c mice were inoculated with 200 μL of 1×10^6 TCID 50 /mL different strains of PCV2;the serum and tissues of mice were collected at different time. SYBR Green I fluorescent quantitative PCR was used to determine the viral titer in the serum and tissues of mice.[Result]The results indicated that the SYBR Green I PCR could speci fically detect PCV2 with high specificity. All strains were detected in the serum 14 d after infection, and 2007HA strain had the highest level of 1.21×10^8 copies/mL. The titers of all strains decreased 21 d after infection and then increased 28 d after infection. In addition, 2010NJ strain had the highest titer in serum 28 d after infection. The two PCV2b isolates, 2010NJ and 2009ZJ, had the highest titer in lungs and spleens. [Conclusion]All results showed that different PCV2 isolates have different proliferation ef ficiencies in Balb/c mice, even if they belong to the same subtype. In addition, the proliferation rate of 2009ZJ in visceral organs was significantly higher than that in serum. However, this phenomenon is not obvious for other strains. These results laid a foundation for the analysis of proliferation characteristics and pathogenicity of different PCV2 strains in vivo.

诚信是一种品质

<左传>有一句话叫做"信不由中,质无益也",意思为不是发自内心的诚信,实在是没有什么用处.古人也认为,诚信不是形而上的东西,而是一种内心修炼,是人的固有品质.

N-Bromosuccinimide-Promoted Direct Phosphorylation of Alcohols with P(O)-H Compounds

A mild,green,convenient and scalable N-bromosuccinimide(NBS)promoted direct phosphorylation strategy of secondary phosphine oxides and alcohols for the synthesis of various phosphinate esters was developed.A variety of substrates are well-tolerated and the desirable compounds were afforded in moderate to excellent yields(up to 92%).This reaction is conducted at room temperature without the addition of any oxidant and metal catalyst,which provides a new strategy for the synthesis of phosphinate esters.

Comparative analysis of structural characteristics and cardiomyocyte protective effects of glucomannan extracted from Bletilla striata using varied methods

Doxorubicin(DOX)is a widely employed tumor therapy,yet its substantial toxic side effects pose a considerable challenge.Bletilla striata has demonstrated efficacy in preventing and treating these toxic side effects in clinical practice,with polysaccharides identified as the principal active component.In the present study,16 fractions of B.striata polysaccharides(BsPs)were extracted using diverse methods,including hot-water extraction(HWE),ultrasonic-assisted extraction(UAE),enzyme-assisted extraction(EAE),dilute acid-water extraction(ACWE),and dilute alkali-water extraction(ALWE).These extractions were subsequently precipitated at final ethanol concentrations of 80%and 95%,respectively.The investigation encompassed yields,total carbohydrate content(TCC),total protein content(TPC),preliminary structural properties,and anti-DOX myocardial cytotoxic activity.Results indicated that the extraction method significantly influenced the physicochemical properties,associated functional properties,and anti-DOX myocardial cytotoxic activity of BsPs.HWE and UAE yielded higher BsPs quantities.The relative molecular weight(RMW)distribution of BsPs differed notably between HWE or UAE,EAE,ACWE,and ALWE.The RMW of primary BsPs obtained from HWE and UAE(1.9×10^(7)-1.7×10^(7) Da)exceeded that from EAE(7.5×10^(3)-2.8×10^(4) Da)and ALWE(5.1×10^(4)-1.7×10^(4) Da),with smaller molecular weights primarily precipitated by higher ethanol concentrations.BsPs were composed of Man and Glu,with partial fractions containing small amounts of Gal or Ara,displaying varying molar ratios.Notably,BsPs from ACWE exhibited the most significant structural differences,lacking 1,4-α-D-Glcp and a triple-helical structure.Furthermore,BsPs obtained from HWE,UAE,and EAE demonstrated heightened anti-DOX myocardial cytotoxic activity compared to other methods.This study underscored the influence of extraction methods on BsPs’structure and myocardial protective activity,offering a foundation for exploring structural diversity and employing specific extraction methods to extract polysaccharides with robust myocardial protective properties efficiently.