The low energy density,unsatisfied cycling performance,potential safety issue and slow charging kinetics of the commercial lithium-ion batteries restrained their further application in the fields of fast charging and ...The low energy density,unsatisfied cycling performance,potential safety issue and slow charging kinetics of the commercial lithium-ion batteries restrained their further application in the fields of fast charging and long-haul electric vehicles.Monoclinic TiNb_(2)O_(7)(TNO)with the theoretical capacity of 387 mAh g^(-1)has been proposed as a high-capacity anode materials to replace Li4Ti5O12.In this work,homovalent doping strategy was used to enhance the electrochemical performance of TiNb_(2)O_(7)(TNO)by employing Zr to partial substitute Ti through solvothermal method.The doping of Zr^(4+)ions can enlarge the lattice structure without changing the chemical valence of the original elements,refine and homogenize the grains,improve the electrical conductivity,and accelerate the ion diffusion kinetics,and finally enhance the cycle and rate performance.Specifically,Z0.05-TNO shows initial discharge capacity of as high as 312.2 mAh g^(-1)at 1 C and 244.8 mAh g^(-1)at 10 C,and still maintains a high specific capacity of 171.3 mAh g^(-1)after 800 cycles at 10 C.This study provides a new strategy for high-performance fast-charging energy storage electrodes.展开更多
【背景】睾丸是雄性动物重要生殖器官,具有产生精子和分泌雄激素的功能,睾丸质量与繁殖性能有直接联系。睾丸性状受下丘脑-垂体-性腺轴多基因共同调控,其分子机理尚不清楚。宁都黄鸡睾丸性状变异系数大,繁殖性能一致性差。【目的】通过...【背景】睾丸是雄性动物重要生殖器官,具有产生精子和分泌雄激素的功能,睾丸质量与繁殖性能有直接联系。睾丸性状受下丘脑-垂体-性腺轴多基因共同调控,其分子机理尚不清楚。宁都黄鸡睾丸性状变异系数大,繁殖性能一致性差。【目的】通过对不同睾丸性状个体垂体组织进行全长转录组测序,挖掘候选基因以及关键信号通路,探究影响睾丸性状的遗传基础,以期为发展地方鸡种睾丸性状的选种选育提供依据。【方法】以70只22周龄宁都黄公鸡为研究对象,分为大睾丸组和小睾丸组,从两组中分别选取3个个体,构建垂体组织的全长转录本表达谱,筛选高表达量及两组个体差异表达基因或转录本,对差异基因或转录本进行功能富集分析。随机选取6个基因,进行基因表达水平验证。参考已知垂体细胞的标记基因,筛选与8种细胞标记基因对应的差异表达基因或转录本,并分析这些差异基因或转录本以及高表达量基因或转录本与睾丸性状相关性。【结果】在6个宁都黄鸡垂体组织中,检测到21834个基因,29355个全长转录本。其中,332个基因及229个转录本在两组个体中差异表达。KEGG通路分析结果显示,这些差异基因或转录本主要富集于Apelin信号、甘油磷脂代谢等通路。一共发现5个促性腺细胞标记基因或其对应转录本与部分睾丸性状显著相关,包括NFASC(neurofascin)及其对应转录本XM_015298904.2、TESC(tescalcin)及其对应转录本XM_025155510.1、FSHB(folliclestimulatinghormonebeta)转录本ONT.20974.4、RLN3(relaxin 3)、NDUFB2(NADH:ubiquinone oxidoreductase subunit B2)转录本ONT.1176.4。1个催乳素细胞标记基因EGR1(early growth response 1),2个滤泡星状细胞标记基因TMSB4X(thymosin beta 4,X-linked)、C1H12ORF57(chromosome 1 open reading frame),1个促甲状腺细胞标记基因CHGB(chromogranin B)均与部分睾丸性状显著相关。2个高表达量基因TMSB4X、HSP90AA1(heat shock protein 90 alpha family class A member 1)与部分睾丸性状显著相关。FSHB、EGR1均为基因互作网络中节点基因。【结论】经初步功能分析,EGR1、TMSB4X、FSHB、RLN3为睾丸性状调控的关键基因。MAPK信号通路、神经活性配体-受体相互作用、GnRH信号通路为睾丸性状调控的关键基因通路。展开更多
Shale oil reservoirs are generally characterized by complex mineral compositions, rapid lithofacies changes, and thin laminae. Explorations have confirmed that the type and density of shale laminae significantly influ...Shale oil reservoirs are generally characterized by complex mineral compositions, rapid lithofacies changes, and thin laminae. Explorations have confirmed that the type and density of shale laminae significantly influence reservoir quality, highlighting the importance of accurately identifying these laminae through well logging for effective shale reservoir evaluation. Presently, relevant technologies primarily focus on the qualitative identification of shale laminae using vertical slab images from image logs. However, influenced by the complex borehole conditions and image logging quality, this approach is less effective in identifying millimeter-scale laminae. This study proposes a new method for achieving high-resolution slab images and quantitatively evaluating the laminae using electrical image logs. The new method effectively improves the processing accuracy of slab images by delicately flattening and aligning the button electrode curves derived from electrical image logs point by point. Meanwhile, it allows for the accurate quantitative evaluation of the lamina number through precise identification of peaks and troughs in microelectrode curves. As demonstrated by the applications in shale oil reservoirs in the Gulong area in Daqing and the Ganchagou area in Qinghai, the proposed method can significantly improve accuracy compared to traditional slab images. Furthermore, the lamination index calculated using this method is highly consistent with the lamina number observed in cores. This study provides a new technical method for the quantitative lamina evaluation and rock structure analysis of shale reservoirs.展开更多
Hydrazine oxidation reaction(HzOR)assisted hydrogen evolution reaction(HER)offers a feasible path for low power consumption to hydrogen production.Unfortunately however,the total electrooxidation of hydrazine in anode...Hydrazine oxidation reaction(HzOR)assisted hydrogen evolution reaction(HER)offers a feasible path for low power consumption to hydrogen production.Unfortunately however,the total electrooxidation of hydrazine in anode and the dissociation kinetics of water in cathode are critically depend on the interaction between the reaction intermediates and surface of catalysts,which are still challenging due to the totally different catalytic mechanisms.Herein,the[W–O]group with strong adsorption capacity is introduced into CoP nanoflakes to fabricate bifunctional catalyst,which possesses excellent catalytic performances towards both HER(185.60 mV at 1000 mA cm^(−2))and HzOR(78.99 mV at 10,00 mA cm^(−2))with the overall electrolyzer potential of 1.634 V lower than that of the water splitting system at 100 mA cm^(−2).The introduction of[W–O]groups,working as the adsorption sites for H2O dissociation and N2H4 dehydrogenation,leads to the formation of porous structure on CoP nanoflakes and regulates the electronic structure of Co through the linked O in[W–O]group as well,resultantly boosting the hydrogen production and HzOR.Moreover,a proof-of-concept direct hydrazine fuel cell-powered H_(2) production system has been assembled,realizing H_(2)evolution at a rate of 3.53 mmol cm^(−2)h^(−1)at room temperature without external electricity supply.展开更多
基金supported by the National Natural Science Foundation of China(52272258)Beijing Nova Program(20220484214)+1 种基金Fundamental Research Funds for the Central Universities(No.2021JCCXJD01)Key R&D and transformation projects in Qinghai Province(2021-HZ-808)and Hebei Province(21314401D).
文摘The low energy density,unsatisfied cycling performance,potential safety issue and slow charging kinetics of the commercial lithium-ion batteries restrained their further application in the fields of fast charging and long-haul electric vehicles.Monoclinic TiNb_(2)O_(7)(TNO)with the theoretical capacity of 387 mAh g^(-1)has been proposed as a high-capacity anode materials to replace Li4Ti5O12.In this work,homovalent doping strategy was used to enhance the electrochemical performance of TiNb_(2)O_(7)(TNO)by employing Zr to partial substitute Ti through solvothermal method.The doping of Zr^(4+)ions can enlarge the lattice structure without changing the chemical valence of the original elements,refine and homogenize the grains,improve the electrical conductivity,and accelerate the ion diffusion kinetics,and finally enhance the cycle and rate performance.Specifically,Z0.05-TNO shows initial discharge capacity of as high as 312.2 mAh g^(-1)at 1 C and 244.8 mAh g^(-1)at 10 C,and still maintains a high specific capacity of 171.3 mAh g^(-1)after 800 cycles at 10 C.This study provides a new strategy for high-performance fast-charging energy storage electrodes.
文摘【背景】睾丸是雄性动物重要生殖器官,具有产生精子和分泌雄激素的功能,睾丸质量与繁殖性能有直接联系。睾丸性状受下丘脑-垂体-性腺轴多基因共同调控,其分子机理尚不清楚。宁都黄鸡睾丸性状变异系数大,繁殖性能一致性差。【目的】通过对不同睾丸性状个体垂体组织进行全长转录组测序,挖掘候选基因以及关键信号通路,探究影响睾丸性状的遗传基础,以期为发展地方鸡种睾丸性状的选种选育提供依据。【方法】以70只22周龄宁都黄公鸡为研究对象,分为大睾丸组和小睾丸组,从两组中分别选取3个个体,构建垂体组织的全长转录本表达谱,筛选高表达量及两组个体差异表达基因或转录本,对差异基因或转录本进行功能富集分析。随机选取6个基因,进行基因表达水平验证。参考已知垂体细胞的标记基因,筛选与8种细胞标记基因对应的差异表达基因或转录本,并分析这些差异基因或转录本以及高表达量基因或转录本与睾丸性状相关性。【结果】在6个宁都黄鸡垂体组织中,检测到21834个基因,29355个全长转录本。其中,332个基因及229个转录本在两组个体中差异表达。KEGG通路分析结果显示,这些差异基因或转录本主要富集于Apelin信号、甘油磷脂代谢等通路。一共发现5个促性腺细胞标记基因或其对应转录本与部分睾丸性状显著相关,包括NFASC(neurofascin)及其对应转录本XM_015298904.2、TESC(tescalcin)及其对应转录本XM_025155510.1、FSHB(folliclestimulatinghormonebeta)转录本ONT.20974.4、RLN3(relaxin 3)、NDUFB2(NADH:ubiquinone oxidoreductase subunit B2)转录本ONT.1176.4。1个催乳素细胞标记基因EGR1(early growth response 1),2个滤泡星状细胞标记基因TMSB4X(thymosin beta 4,X-linked)、C1H12ORF57(chromosome 1 open reading frame),1个促甲状腺细胞标记基因CHGB(chromogranin B)均与部分睾丸性状显著相关。2个高表达量基因TMSB4X、HSP90AA1(heat shock protein 90 alpha family class A member 1)与部分睾丸性状显著相关。FSHB、EGR1均为基因互作网络中节点基因。【结论】经初步功能分析,EGR1、TMSB4X、FSHB、RLN3为睾丸性状调控的关键基因。MAPK信号通路、神经活性配体-受体相互作用、GnRH信号通路为睾丸性状调控的关键基因通路。
文摘Shale oil reservoirs are generally characterized by complex mineral compositions, rapid lithofacies changes, and thin laminae. Explorations have confirmed that the type and density of shale laminae significantly influence reservoir quality, highlighting the importance of accurately identifying these laminae through well logging for effective shale reservoir evaluation. Presently, relevant technologies primarily focus on the qualitative identification of shale laminae using vertical slab images from image logs. However, influenced by the complex borehole conditions and image logging quality, this approach is less effective in identifying millimeter-scale laminae. This study proposes a new method for achieving high-resolution slab images and quantitatively evaluating the laminae using electrical image logs. The new method effectively improves the processing accuracy of slab images by delicately flattening and aligning the button electrode curves derived from electrical image logs point by point. Meanwhile, it allows for the accurate quantitative evaluation of the lamina number through precise identification of peaks and troughs in microelectrode curves. As demonstrated by the applications in shale oil reservoirs in the Gulong area in Daqing and the Ganchagou area in Qinghai, the proposed method can significantly improve accuracy compared to traditional slab images. Furthermore, the lamination index calculated using this method is highly consistent with the lamina number observed in cores. This study provides a new technical method for the quantitative lamina evaluation and rock structure analysis of shale reservoirs.
基金supported by the National Natural Science Foundation of China (52172110)the “Scientific and Technical Innovation Action Plan” China Science&Technology Cooperation Project of Shanghai Science and Technology Committee (21520760500)+1 种基金the “Super Postdoctoral Incentive Program” of Shanghai Municipal Human Resources and Social Security Bureau (2021411)Special Research Assistant Grant Project from Chinese Academy of Sciences
基金support of this research by National Natural Science Foundation of China(52172110)Key Research Program of Frontier Sciences,Chinese Academy of Sciences(ZDBS-LY-SLH029)+1 种基金the“Scientific and Technical Innovation Action Plan”Hong Kong,Macao and Taiwan Science&Technology Cooperation Project of Shanghai Science and Technology Committee(21520760500)BL14W1 beamline of Shanghai Synchrotron Radiation Facility(SSRF).
文摘Hydrazine oxidation reaction(HzOR)assisted hydrogen evolution reaction(HER)offers a feasible path for low power consumption to hydrogen production.Unfortunately however,the total electrooxidation of hydrazine in anode and the dissociation kinetics of water in cathode are critically depend on the interaction between the reaction intermediates and surface of catalysts,which are still challenging due to the totally different catalytic mechanisms.Herein,the[W–O]group with strong adsorption capacity is introduced into CoP nanoflakes to fabricate bifunctional catalyst,which possesses excellent catalytic performances towards both HER(185.60 mV at 1000 mA cm^(−2))and HzOR(78.99 mV at 10,00 mA cm^(−2))with the overall electrolyzer potential of 1.634 V lower than that of the water splitting system at 100 mA cm^(−2).The introduction of[W–O]groups,working as the adsorption sites for H2O dissociation and N2H4 dehydrogenation,leads to the formation of porous structure on CoP nanoflakes and regulates the electronic structure of Co through the linked O in[W–O]group as well,resultantly boosting the hydrogen production and HzOR.Moreover,a proof-of-concept direct hydrazine fuel cell-powered H_(2) production system has been assembled,realizing H_(2)evolution at a rate of 3.53 mmol cm^(−2)h^(−1)at room temperature without external electricity supply.
