Assessment of the spatial and temporal variations of water quality for agricultural lands with crop rotation in China by using a HYPE model

Many water quality models have been successfully used worldwide to predict nutrient losses from anthropogenically impacted catchments, but hydrological and nutrient simulations with little data are difficult considering the transfer of model parameters and complication of model calibration and validation. This study aims (i) to assess the performance capabilities of a new and relatively more advantageous model-hydrological predictions for the environment (HYPE) to simulate stream flow and nutrient load in ungauged agricultural areas by using a multi-site and multi-objective parameter calibration method and (ii) to investigate the temporal and spatial variations of total nitrogen (TN) and total phosphorous (TP) concentrations and loads with crop rotation using the model for the first time. A parameter estimation tool (PEST) was used to calibrate parameters, which shows that the parameters related to the effective soil porosity were most sensitive to hydrological modeling. N balance was largely controlled by soil denitrification processes, whereas P balance was influenced by the sedimentation rate and production/decay of P in rivers and lakes. The model reproduced the temporal and spatial variations of discharge and TN/TP relatively well in both calibration (2006–2008) and validation (2009–2010) periods. The lowest NSEs (Nash-Suttclife Efficiency) of discharge, daily TN load, and daily TP load were 0.74, 0.51, and 0.54, respectively. The seasonal variations of daily TN concentrations in the entire simulation period were insufficient, indicated that crop rotation changed the timing and amount of N output. Monthly TN and TP simulation yields revealed that nutrient outputs were abundant in summer in terms of the corresponding discharge. The area-weighted TN and TP load annual yields in five years showed that nutrient loads were extremely high along Hong and Ru rivers, especially in agricultural lands

The impact of media image shaping of sports idols on adolescents\u27 health

Adolescents in their quest for self-discovery urgently need an idol to help construct their self-identity. Sports idols, with their spirit of striving for excellence and charismatic personalities, are pursued and admired by teenagers, exerting a significant and profound influence on their growth. Due to the rapid development of mass media, the image shaping of sports idols is inseparable from the media, which presents different characteristics when shaping the media image of sports idols between commercial and public interests, thus having varying impacts, both positive and negative, on teenagers. To shape a positive media image of sports idols, governments and related departments should not only improve athletes\u27 tactical levels but also cultivate their comprehensive qualities; mass media should be aware of their social responsibility and shape a positive image of sports idols; sports idol teams need to communicate with the media and manage their own image well; schools and families, in this process, should reasonably guide teenagers to rationally worship sports idols

Prediction and experimental study on structure and radiation noise of subway gearbox

A dynamic finite element model of a coupled gear-rotor-bearing-housing gear system is developed by combining the gearbox transmission model with the housing structure model of subway gearbox with taking stiffness excitation, error exaction and meshing impact exaction as the dynamic excitation. The intrinsic modes and vibration response are computed in the numerical simulation process. Then an acoustic boundary element model of the gearbox is established by using the result of vibration displacement of the nodes on gearbox surface as acoustic boundary conditions. The surface sound pressure of gearbox and radiation noise of field points are solved by the direct boundary element method. In fact the proposed modeling approach not only provides a more comprehensive understanding of the subway gear system, but also can serve as the basis for dynamic and noise optimization of gear system. Finally a vibration and radiation noise experimental study is performed on the subway gear system. The vibration and radiation noise at some concerned locations are monitored and analysed. The comparison analysis shows that computational results are in good agreement with the data of experiment tests

Neutral beam current drive in a tokamak

Neutral beam current drive (NBCD) on the EAST tokamak is studied by using Monte-Carlo simulation. The electron shielding effect to the fast ion current is taken into account by using a fitting formula applicable to general tokamak equilibria and arbitrary collisionality regime. The net currents driven by the beam are off-axis although the fast ion currents are on-axis. This is found to be due to the electron shielding effect being strong near the magnetic axis. We also investigate the dependence of NBCD efficiency on the plasma density. The results indicate that the NBCD efficiency decreases with the increase in plasma density. A simple semi-analytic estimation of the dependence of NBCD efficiency on the density is proposed and is in reasonable agreement with the results directly obtained in the simulations

GJB2 mutation spectrum in 2063 Chinese patients with nonsyndromic hearing impairment

Background: Mutations in GJB2 are the most common molecular defects responsible for autosomal recessive nonsyndromic hearing impairment (NSHI). The mutation spectra of this gene vary among different ethnic groups. Methods: In order to understand the spectrum and frequency of GJB2 mutations in the Chinese population, the coding region of the GJB2 gene from 2063 unrelated patients with NSHI was PCR amplified and sequenced. Results: A total of 23 pathogenic mutations were identified. Among them, five (p.W3X, c.99delT, c.155_c.158delTCTG, c.512_c.513insAACG, and p.Y152X) are novel. Three hundred and seven patients carry two confirmed pathogenic mutations, including 178 homozygotes and 129 compound heterozygotes. One hundred twenty five patients carry only one mutant allele. Thus, GJB2 mutations account for 17.9% of the mutant alleles in 2063 NSHI patients. Overall, 92.6% (684/739) of the pathogenic mutations are frame-shift truncation or nonsense mutations. The four prevalent mutations; c.235delC, c.299_c.300delAT, c.176_c.191del16, and c.35delG, account for 88.0% of all mutantalleles identified. The frequency of GJB2 mutations (alleles) varies from 4% to 30.4% among different regions of China. It also varies among different sub-ethnic groups. Conclusion: In some regions of China, testing of the three most common mutations can identify at least one GJB2 mutant allele in all patients. In other regions such as Tibet, the three most common mutations account for only 16% the GJB2 mutant alleles. Thus, in this region, sequencing of GJB2 would be recommended. In addition, the etiology of more than 80% of the mutant alleles for NSHI in China remains to be identified. Analysis of other NSHI related genes will be necessary.Version of Recor

Research on Lightning Performance and Protective Measures of ±800 kV UHVDC Power Transmission Line

[Introduction] Lightning strike is the primary cause of failures of ±800 kV UHVDC power transmission lines, and the lightning protection assessment of power transmission lines is critical to the safe and stable operation of the system. [Method] Based on a ±800 kV power transmission line project under construction in China, the conductor and ground wire types were selected according to the design and use conditions of the project, and the typical towers were determined according to the altitude and meteorological area distribution along the line. After comprehensive consideration of the distribution ratio of ground inclination, soil resistivity, thunderstorm days, meteorological zone, etc. of towers along the line, the lightning protection performance of the line was evaluated and specific lightning protection measures were proposed in respect of the lighting characteristics of the project. In addition, the calculation differences between the two methods regarding terrain considerations in the EGM were compared. [Result] The calculation results show that the comprehensive lightning flashover rate doesn’t meet the requirements of design reference value and mainly protect against shielding failure. Thunderstorm days and the terrain conditions on the positive side of tower are the key factors for lightning protection. [Conclusion] After adopting the -15° tower protection angle, the line located in lightning areas with C level and above whose positive side ground inclination angle is ≥25° can meet the lightning protection requirements that the lightning flashover rate is not more than 0.10 fl/(100 km·a·40 d). The lightning protection performance and actual operating data of this project and adjacent ±800 kV as-built lines are compared and analyzed, which verifies the rationality of the calculation method and results in this paper

Systemic immune-inflammation index is associated with high risk for prostate cancer among the U.S. elderly: Evidence from NHANES 2001-2010

PurposeThe Systemic Immuno-Inflammation Index (SII) is a crucial clinical measure of inflammation, and there is currently no solid evidence linking SII to an increased risk of prostate cancer (PCa). Through the analysis of serum total prostate-specific antigen (tPSA), free prostate-specific antigen (fPSA), and the tPSA/fPSA (fPSA%) ratio, this study sought to investigate the relationship between SII and PCa risk among the U.S. elderly.MethodsElderly male participants were gathered from the NHANES database between 2001 and 2010.SII was calculated by platelet count * neutrophil count/lymphocyte count. High risk individuals for prostate cancer were defined as those with tPSA > 4 ng/ml and fPSA% < 16%. Multivariate logistic regression models, restricted cubic spline curves, and subgroup analyses were used to assess the relationship between SII and PCa risk.ResultsThis research comprised 2664 people in total, 137 (5.14%) of whom were deemed to be at high risk of developing PCa. Multivariate logistic regression analysis, after controlling for variables, revealed a significant positive correlation between high PCa risk and an increase in SII (p = 0.009). The RCS suggested a turning point at 9.01. Restricted cubic spline curves revealed a non-linear U-shaped association between SII and high PCa risk (p for nonlinear = 0.028). Education level, marital status, PIR, alcohol status, smoking status, rheumatoid arthritis status, and heart problem were not significantly correlated with this positive connection, according to subgroup analyses and interaction tests.ConclusionThe results of this study suggest that inflammation represented by SII is associated with high PCa risk

Diagnosis and phylogenetic analysis of Orf virus from goats in China: a case report

<p>Abstract</p> <p>Background</p> <p>Orf virus (ORFV) is the etiological agent of contagious pustular dermatitis and is the prototype of the genus Parapoxvirus (PPV). It causes a severe exanthematous dermatitis that afflicts domestic and wild small ruminants.</p> <p>Case presentation</p> <p>In the present study, an outbreak of proliferative dermatitis in farmed goats. The presence of ORFV in tissue scrapings from the lips was confirmed by B2L gene polymerase chain reaction (PCR) amplification. The molecular characterization of the ORFV was performed using PCR amplification, DNA sequencing and phylogenetic analysis of the B2L gene.</p> <p>Conclusion</p> <p>The results of this investigation indicated that the outbreak was caused by infection with an ORFV that was closely related genetically to Nantou (DQ934351), which was isolated from the Tai wan province of China and Hoping (EU935106), which originated from South Korea in 2008. This is the first report of the phylogenetic analysis of ORFV from goats in China.</p