Understanding Bridging Sites and Accelerating Quantum Efficiency for Photocatalytic CO_(2) Reduction

We report a novel double-shelled nanoboxes photocatalyst architecture with tailored interfaces that accelerate quantum efficiency for photocatalytic CO_(2) reduction reaction(CO_(2)RR)via Mo–S bridging bonds sites in S_(v)–In_(2)S_(3)@2H–MoTe_(2).The X-ray absorption near-edge structure shows that the formation of S_(v)–In_(2)S_(3)@2H–MoTe_(2) adjusts the coordination environment via interface engineering and forms Mo–S polarized sites at the interface.The interfacial dynamics and catalytic behavior are clearly revealed by ultrafast femtosecond transient absorption,time-resolved,and in situ diffuse reflectance–Infrared Fourier transform spectroscopy.A tunable electronic structure through steric interaction of Mo–S bridging bonds induces a 1.7-fold enhancement in S_(v)–In_(2)S_(3)@2H–MoTe_(2)(5)photogenerated carrier concentration relative to pristine S_(v)–In_(2)S_(3).Benefiting from lower carrier transport activation energy,an internal quantum efficiency of 94.01%at 380 nm was used for photocatalytic CO_(2)RR.This study proposes a new strategy to design photocatalyst through bridging sites to adjust the selectivity of photocatalytic CO_(2)RR.

Flexible control strategy for HVDC transmission system adapted to intermittent new energy delivery

Intermittent new energy delivery requires increasing the flexibility of ultra-high voltage direct current(DC)power adjustment.Based on a converter steady-state model and a DC power model,the control angle constraints of a converter valve are relaxed for power regulation.In this paper,a flexible DC power control method based on a fixed tap changer position is proposed.The initial ratio of the converter transformer is optimized.The effects of the fixed-tap changer position control on the control angle,reactive power compensation,and commutation failure are analyzed.The new control method allows a DC system to operate at a large angle and increase the additional reactive power loss while improving the commutation security margin.Steady-state and electromagnetic transient simulations in the CIGRE test system verify the validity of the method proposed in this paper and the correctness of the analysis conclusions.

Subspace Identification for Closed-Loop Systems With Unknown Deterministic Disturbances

This paper presents a subspace identification method for closed-loop systems with unknown deterministic disturbances.To deal with the unknown deterministic disturbances,two strategies are implemented to construct the row space that can be used to approximately represent the unknown deterministic disturbances using the trigonometric functions or Bernstein polynomials depending on whether the disturbance frequencies are known.For closed-loop identification,CCF-N4SID is extended to the case with unknown deterministic disturbances using the oblique projection.In addition,a proper Bernstein polynomial order can be determined using the Akaike information criterion(AIC)or the Bayesian information criterion(BIC).Numerical simulation results demonstrate the effectiveness of the proposed identification method for both periodic and aperiodic deterministic disturbances.

The first power generation test of hot dry rock resources exploration and production demonstration project in the Gonghe Basin,Qinghai Province,China

Hot dry rock(HDR)is a kind of clean energy with significant potential.Since the 1970s,the United States,Japan,France,Australia,and other countries have attempted to conduct several HDR development research projects to extract thermal energy by breaking through key technologies.However,up to now,the development of HDR is still in the research,development,and demonstration stage.An HDR exploration borehole(with 236℃ at a depth of 3705 m)was drilled into Triassic granite in the Gonghe Basin in northwest China in 2017.Subsequently,China Geological Survey(CGS)launched the HDR resources exploration and production demonstration project in 2019.After three years of efforts,a sequence of significant technological breakthroughs have been made,including the genetic model of deep heat sources,directional drilling and well completion in high-temperature hard rock,large-scale reservoir stimulation,reservoir characterization,and productivity evaluation,reservoir connectivity and flow circulation,efficient thermoelectric conversion,monitoring,and geological risk assessment,etc.Then the whole-process technological system for HDR exploration and production has been preliminarily established accordingly.The first power generation test was completed in November 2021.The results of this project will provide scientific support for HDR development and utilization in the future.

云南白族民家支系18个常染色体STR位点的遗传多态性

目的调查云南白族民家支系2323个健康无亲缘关系个体18个STR基因座的遗传多态性,计算群体遗传学参数,建立云南白族民家支系群体的遗传学基础数据,为司法鉴定工作中的亲子鉴定和个体识别提供可靠的科学依据。方法收集2323份云南白族民家支系人群无关个体样本,采用DNATyperTM19试剂盒,进行直接PCR复合扩增,用AB 3130XL自动遗传分析仪进行毛细管电泳分离,用GeneMapper ID-X 1.5软件对分离的STR进行分型。使用Modified-Powerstats软件统计等位基因频率,进行Hardy-Weinberg平衡(HWE)检验,计算匹配概率等法医学参数。使用Arlequin软件计算Fst和P值。使用Phylip软件计算Nei’s遗传距离。使用SPSS软件进行多维尺度(MDS)分析。应用Mega软件构建相邻连接(NJ)系统发育树。结果18个STR基因座中共观察到230个等位基因和1073种基因型。除D13S317基因座不符合Hardy-Weinberg平衡(P=0.0008)外,其余基因座等位基因频率和基因型频率均符合Hardy-Weinberg平衡(P>0.05/18=0.0028)。18个STR基因座的累积个人识别能力(CDP)达0.999999999,累积非父排除概率(CPE)达0.99999994055。Fst值、Nei's遗传距离以及NJ系统发育树的结果均提示,白族民家支系与云南布朗族和云南佤族相距较远,而与大理白族和怒江白族相距较近。结论上述18个STR基因座在云南白族民家支系群体中具有高度多态性,可用于司法鉴定和群体遗传结构研究。

卷烟行业工厂对标评价与展示方法及应用

对标管理可为卷烟工厂提供优秀的管理方法和工具,提供不断追求改进的思路。科学、合理的对标指标分析是对标管理的基础。本文对卷烟行业工厂的对标指标达标和提升情况进行描述和分析,了解全行业的发展状况;将16个卷烟工厂对标指标进行合理地分类,运用改进后的功效系数法计算出卷烟工厂在各个指标上的水平得分和提升得分,并求出各个类别的综合得分;再引入象限图来直观、形象展示各个工厂在对标指标的表现情况。本文对于卷烟工厂的对标指标评价方法有利于各工厂的合理定位、树立标杆、顾全大局、精益管理和科学决策。

DEtail-seq is an ultra-efficient and convenient method for meiotic DNA break profiling in multiple organisms

Programmed DNA double-strand break(DSB)formation is a crucial step in meiotic recombination,yet techniques for highefficiency and precise mapping of the 3’ends of DSBs are still in their infancy.Here,we report a novel technique,named DNA End tailing and sequencing(DEtail-seq),which can directly and ultra-efficiently characterize the 3’ends of meiotic DSBs with near single-nucleotide resolution in a variety of species,including yeast,mouse,and human.We find that the 3’ends of meiotic DSBs are stable without significant resection in budding yeast.Meiotic DSBs are strongly enriched in de novo H3K4me3 peaks in the mouse genome at leptotene stage.We also profile meiotic DSBs in human and find DSB hotspots are enriched near the common fragile sites during human meiosis,especially at CCCTC-binding factor(CTCF)-associated enhancers.Therefore,DEtail-seq provides a powerful method to detect DSB ends in various species,and our results provide new insights into the distribution and regulation of meiotic DSB hotspots.

Extremely strong coupling s-wave superconductivity in the medium-entropy alloy TiHfNbTa

Here we report a TiHfNbTa bulk medium-entropy alloy(MEA)superconductor crystallized in the body-centered cubic structure with the unit cell parameter a=3.35925?,which is synthesized by an arc melting method.Superconducting properties of the TiHfNbTa are studied by employing magnetic susceptibility,resistivity,and specific heat measurements.Experimental results show a bulk superconducting transition temperature(Tc)of around 6.75 K.The lower and upper critical fields for TiHfNbTa are45.8 m T and 10.46 T,respectively.First-principles calculations show that the d electrons of Ti,Hf,Nb,and Ta are the main contribution to the total density of states near the Fermi level.Our results indicate that the superconductivity is a conventional swave type with extremely strong coupling(△C_(el)/γ_(n)T_(c)=2.88,2△_(0)/k_(B)T_(c)=5.02,and λ_(ep)=2.77).The extremely strong coupling behavior in the s-wave type Ti Hf Nb Ta MEA superconductor is unusual because it generally happens in cuprates,pnictides,and other unconventional superconductors.

Ethanol extract of Ardisiae Japonicae Herba inhibits hepatoma carcinoma cell proliferation in vitro through regulating lipid metabolism

Objective:The aim of this study is to discover the possible working mechanisms of Ardisiae Japonicae Herba(AJH)on hepatoma carcinoma(HCC).Methods:In this study,ethanol extract of AJH was prepared and used to treat HCC cell in vitro.Furthermore,a genomic wide RNA sequencing(RNA-seq)was performed to screen deregulated genes in HCC cells after the treatment of AJH extract.The gene and protein expression related to lipid metabolism in HCC cells were also investigated to validate the results obtained from RNA-seq.Results:AJH extract could inhibit HCC cell proliferation in vitro.RNA-seq analysis has identified 1,601 differentially expressed genes(DEGs,fold change≥2.0 or fold change≤0.5,P<0.05)in HCC after AJH extract treatment,which included 225 up-regulated genes and 1,376 down-regulated genes.KEGG pathway analysis of DEGs demonstrated that lipid metabolism was a potential pathway related to AJH treatment.In agreement with the RNA-seq data,q PCR and Western-blot analysis indicated that expression of genes and proteins related to lipid metabolism(SREBP1,ACC,ACLY and FASN)were significantly downregulated in AJH treatment group as compared with the control group.Furthermore,AJH extract could also decrease lipid contents and cellular free fatty acid levels in HCC cells.Conclusion:Ethanol extract of AJH could inhibit HCC cell proliferation in vitro,the possible mechanism may be related to the inhibition of lipid metabolism.

气候因子调节荒漠土壤中丰富和稀有微生物群落的聚集过程

土壤微生物由少数的丰富类群和大量的稀有类群组成,它们对生态系统的功能和服务有不同的贡献。本研究采用高通量测序技术对荒漠土壤样品的物种组成进行DNA测序分析,揭示土壤微生物丰富类群和稀有类群的组成结构。采用相关性分析和随机森林方法进一步分析环境因子对丰富和稀有类群群落的影响。最后,利用基于零模型的β-最近类群指数(βNTI)解析土壤微生物的群落构建机制。研究结果表明,在荒漠土壤中,稀有细菌的群落构建几乎完全由确定性的同质选择过程支配;相比之下,随机过程对丰富细菌的影响更为明显。然而,无论是丰富真菌还是稀有真菌都表现出相似的群落构建模式,即确定性过程和随机过程共同决定了真菌的群落构建过程。这些结果表明,随着平均年降水量(MAP)和平均年气温(MAT)的增加,丰富细菌的群落构建过程从随机性转变为确定性。而对稀有真菌来说,随着MAT的增加,群落构建过程从确定性向随机性转变。该研究提供了MAT和MAP调节荒漠土壤中丰富和稀有微生物群落构建过程的明确证据。这些发现为进一步研究土壤微生物群落结构和生态功能奠定了理论基础。

R-loopAtlas:An integrated R-loop resource from 254 plant species sustained by a deep-learningbased tool

R-loops are chromatin structures consisting of anRNA:DNA hybrid and the other single-stranded DNA,which widely exist among genomes from bacteria to higher eukaryotes and participate in a variety of biological processes(Zhou et al.,2022).Currently,a variety of approaches to detect genome-wide R-loops have been developed,and ssDRIP-seq(single-strand DNA ligation-based library preparation from DNA:RNA hybrid immunoprecipitation,followed by sequencing)is one of the widely utilized methods(Xu et al.,2022).However,there are many limitations to genome-wide R-loop mapping based on high-throughput methods.For example,the activity of restriction enzymes for genomic DNA fragmentation.

我国国家公园自然资源管理探讨

2017年,我国在部分国家公园体制试点区启动了国有自然资源资产管理体制试点,旨在为国家公园等重要生态空间自然资源管理积累经验。2021年10月12日,习近平主席宣布设立第一批国家公园。因此,探讨国家公园的自然资源管理具有重要的现实意义,可为未来资源环境领域的管理提供参考。本文对国家公园自然资源管理体制试点开展了调研。研究发现,国家公园自然资源管理工作在机构设置、地方立法、权责划分等方面取得进展。我国已建立中央垂直管理、中央和地方共同管理、地方管理等国家公园自然资源管理体制,各省级立法机构共出台了5部国家公园地方性法规,为国家公园自然资源管理提供了法律依据。此外,南山国家公园管理局和武夷山国家公园管理局印发了权责清单,为国家公园自然资源管理职责划分做了有益探索。但还存在一些问题,如国家公园自然资源管理体制映射关系复杂、自然资源权属需进一步厘清、顶层设计需进一步加快等。为此,本文从构建集中统一管理体制、完善国家公园法治体系、厘清自然资源权属关系、有序开展社区人口转移等方面提出了建议,以期为国家公园自然资源管理提供参考。

Performance of steel bridge deck pavement structure with ultra high performance concrete based on resin bonding

This research investigated a pavement system on steel bridge decks that use epoxy resin(EP)bonded ultra-high performance concrete(UHPC).Through FEM analysis and static and dynamic bending fatigue tests of the composite structure,the influences of the interface of the pavement layer,reinforcement,and different paving materials on the structural performance were compared and analyzed.The results show that the resin bonded UHPC pavement structure can reduce the weld strain in the steel plate by about 32%and the relative deflection between ribs by about 52%under standard axial load conditions compared to traditional pavements.The EP bonding layer can nearly double the drawing strength of the pavement interface from 1.3 MPa,and improve the bending resistance of the UHPC structure on steel bridge decks by about 50%;the bending resistance of reinforced UHPC structures is twice that of unreinforced UHPC structure,and the dynamic deflection of the UHPC pavement structure increases exponentially with increasing fatigue load.The fatigue life is about 1.2×10^(7) cycles under a fixed force of 9 kN and a dynamic deflection of 0.35 mm,which meets the requirements for fatigue performance of pavements on steel bridge decks under traffic conditions of large flow and heavy load.