Search

Regarding the monitoring and control technology of pumped storage power stations, the monitoring methods for the operating parameters of the turbines in pumped storage power stations were first analyzed, including the monitoring locations and methods for pressure and vibration, as well as the analysis of the reasons for special operating conditions; Secondly, the operation monitoring and fault diagnosis system of pumped storage power stations was summarized and introduced, including the commonly used monitoring systems, fault diagnosis principles, and application situations. Finally, the development trend of turbine monitoring technology and fault diagnosis was discussed. [ABSTRACT FROM AUTHOR]

Abstract Epidemiological studies have demonstrated that the genetic factors partly influence the development of same-sex sexual behavior, but most genetic studies have focused on people of primarily European ancestry, potentially missing important biological insights. Here, we performed a two-stage genome-wide association study (GWAS) with a total sample of 1478 homosexual males and 3313 heterosexual males in Han Chinese populations and identified two genetic loci (rs17320865, Xq27.3, FMR1NB, P meta = 8.36 × 10−8, OR = 1.29; rs7259428, 19q12, ZNF536, P meta = 7.58 × 10−8, OR = 0.75) showing consistent association with male sexual orientation. A fixed-effect meta-analysis including individuals of Han Chinese (n = 4791) and European ancestries (n = 408,995) revealed 3 genome-wide significant loci of same-sex sexual behavior (rs9677294, 2p22.1, SLC8A1, P meta = 1.95 × 10−8; rs2414487, 15q21.3, LOC145783, P meta = 4.53 × 10−9; rs2106525, 7q31.1, MDFIC, P meta = 6.24 × 10−9). These findings may provide new insights into the genetic basis of male sexual orientation from a wider population scope. Furthermore, we defined the average ZNF536-immunoreactivity (ZNF536-ir) concentration in the suprachiasmatic nucleus (SCN) as lower in homosexual individuals than in heterosexual individuals (0.011 ± 0.001 vs 0.021 ± 0.004, P = 0.013) in a postmortem study. In addition, compared with heterosexuals, the percentage of ZNF536 stained area in the SCN was also smaller in the homosexuals (0.075 ± 0.040 vs 0.137 ± 0.103, P = 0.043). More homosexual preference was observed in FMR1NB-knockout mice and we also found significant differences in the expression of serotonin, dopamine, and inflammation pathways that were reported to be related to sexual orientation when comparing CRISPR-mediated FMR1NB knockout mice to matched wild-type target C57 male mice.

Sustainable development is one of the most significant issues of concern around the world today. Sustainable development goals cover natural resources, the environment, and human well‐being. It follows that eco‐efficiency (EE) and eco‐well‐being performance (EWP) are valid tools for measuring the level of different stages of sustainable development. This study uses a two‐stage super‐SBM model to gauge the EE and EWP of 281 cities in China from 2011 to 2019. The results show the following: (1) The national EE average is low, with M‐shaped "rising‐declining‐rising‐declining" fluctuation. The national EWP average is low, but there is a clear upward trend. (2) From a regional perspective, the best EE is in the eastern region, followed by the central and western regions, and the worst is in the northeastern region. The best EWP is in the western region, followed by the eastern and northeastern regions, and the worst is in the central region. (3) Among the 281 sample cities, approximately 12.8% are in the high EE‐high EWP development mode, 25.6% are in the high EE‐low EWP development mode, 18.2% are in the low EE‐high EWP development mode, and 43.4% are in the low EE‐low EWP development mode. Collectively, the three cities with the strongest sustainability are Shenzhen, Beijing, and Haikou, and the three weakest are Baise, Jinchang, and Baiyin. In addition, cities with larger populations tend to exhibit greater sustainability. These results provide the necessary reference for Chinese cities and cities worldwide in similar situations to formulate policies to improve sustainability. [ABSTRACT FROM AUTHOR]

In large-scale wind farms, the voltage fluctuations caused by the uncertainty of wind speed at the turbine terminals pose a pressing challenge. This article presents a localized voltage control strategy tailored toward rapid adjustments in turbine terminal voltage in wind turbine generators. Based on relative voltage observation, this strategy achieves voltage coordination between the high and low ends of the transformer in wind turbine generators. Firstly, the overall structure of the wind farm and the characteristics of terminal voltage are analyzed. Secondly, the principles and feasibility of the relative voltage control strategy are examined. Finally, the effectiveness of the proposed control strategy is validated through simulation results from a specific wind farm. The results demonstrate its capability to achieve a fast and stable voltage dynamic response within the wind farm based on local information, thus mitigating the risk of voltage out of limit. [ABSTRACT FROM AUTHOR]

In this article, we report artefacts found at the valley of Tsagaan Turuut River in the Khangai Mountain ranges in Central Mongolia. The artefacts were identified based upon core morphology, tool types and retouch. Regarding the core reduction techniques, single striking platform and single reduction platform cores are dominant. Although the tools on flake blanks predominant, tools such as points and knives with massive blades also occur. Side scraper, point, borer, combination tool, and borers are types that are less represented within the collection. This tool collection is highly similar to several IUP and EUP sites (Chikhen-2; Tolbor-4, 15 and 16) in Mongolia in terms of its reduction techniques and tool morphology. On a larger scale, it is similar to those of Early Upper Paleolithic sites in Trans-Baikal and Altai Mountains in Russia and North China.

In the current pandemic of SARS-Cov-2 (formally known as novel coronavirus disease 2019, COVID-19), the cancer treatment is particularly a challenge that must be overcome as soon as possible. Currently, the clinical data on the prevalence of SARS-Cov-2 in cancer patients is very limited, alone with constant evolving situations. To obtain existing evidence, we reviewed a wide range of medical literature and relevant websites including the National Health Commission of China. With the actual situation of Hubei Cancer Hospital, we formulated the interim guideline which was developed by all contributors from different disciplines after fully discussion, to provide the reference for treatment options on cancer patients, especially the cancer patients recovered from COVID-19 infection. This guideline highlighted the multidisciplinary team (MDT) diagnostic model, the assessment between risks and benefits prior to treatment, individualized service for patients' medical needs, and the acceptability in ethics and patients' socio-economic conditions.

A polymetallic layer is usually developed at the bottom of the early Cambrian black shale in Guizhou Province. The mineral that makes up the polymetallic layer is related to the sedimentary facies. To analyze the differentiation mechanism between polymetallic deposits (Ni‐Mo and V), the Zhijin Gezhongwu profile located in the outer shelf and the Sansui Haishan V deposit located in the lower slope are selected to study the in situ sulfur isotopes and trace elements of pyrite. The results show that δ34S values of pyrite vary widely from −7.8 ‰ to 28 ‰ in the Gezhongwu profile, while the δ34S values are relatively uniform (from 27.8 ‰ to 38.4 ‰) in the Haishan profile. The isotopic S composition is consistent with the transition that occurs in the sedimentary phase from the shelf to the deep sea on the transgressive Yangtze platform; this indicates that the δ34SO42– values in seawater must be differently distributed in depositional environments. The sulfur in the Ni‐Mo layer is produced after the mixing of seawater and hydrothermal fluid, while the V layer mainly originates from seawater. Overall, the Ni‐Mo and V deposits have been differentiated primarily on the basis of the combined effect of continental weathering and hydrothermal fluid. [ABSTRACT FROM AUTHOR]

In order to elucidate the effect of chain structure characteristics on the surface roughening and bulk properties of biaxially oriented polypropylene films (BOPP). The crystallization behavior and homogeneous polycrystallinity of three polypropylene (PP) granules with different chain structures were compared. The porosity, roughness, tensile mechanics, thermal shrinkage, dielectric properties and electrical breakdown field strength of BOPP films at different temperatures were tested. The results show that the chain structure with low tacticity (96.2%) and wide molecular weight distribution (5.35) is conducive to the formation of β crystals and uniform spherulite morphology, ensuring the ideal roughening morphology. Although the roughening form of BOPP film prepared by high-tacticity (97.4%) and narrow-distribut (4.34) granules is not optimal, the porosity is 9% and the surface roughness is 0.42 μm, which can meet the requirements of the capacitive film industry standard. Compared with the control films, the transverse tensile strength is 269 MPa, the transverse elastic modulus is 3 692 MPa, and the breakdown field strengths are 668 V/m (25 °C) and 518 V/m (125 °C). Appropriate adjustment of the PP chain structure can take into account the surface roughening and bulk performance, and provide useful inspiration for the design and development of high-performance roughening film for oil-immersed AC capacitors. [ABSTRACT FROM AUTHOR]

In order to avoid the occurrence of unstable phenomena in the Power Grid (PG), it is necessary to have a thorough understanding of the current operating status of the PG. Research on voltage stability evaluation indicators and algorithms in the power system can assist power system operators in making effective decisions. In this paper, an improved continuous power flow scheme based on Lagrange quadratic interpolation was adopted. Secant method and Lagrange quadratic interpolation method were used for prediction comparison, and Newton method was used to correct the predicted results. This article utilized an online voltage safety assessment and warning model to ensure the safe operation of the PG and reduce the occurrence of faults. To ensure the integrity and accuracy of network dynamic information, a least squares fitting method based on orthogonal functions was adopted to improve the fitting accuracy without increasing communication volume. As the step size increases from 2 to 3, the number of power flow solutions decreased and the solution time increased. The effectiveness of the voltage stability evaluation algorithm in this paper was verified through simulation of two node systems: New England 39 and IEEE118. [ABSTRACT FROM AUTHOR]