检索结果-南通市图书馆

New progresses of fine-grained sediment gravity-flow deposits and their importance for unconventional shale oil and gas plays

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2025年第1期22卷 1-15页

作者： Tian Yang Ying-lin Liu State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation (Chengdu University of Technology) Institute of Sedimentary Geology Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Chengdu University of Technology

Fine-grained sediments are widely distributed and constitute the most abundant component in sedimentary systems, thus the research on their genesis and distribution is of great significance. In recent years, fine-grained sediment gravity-flows(FGSGF) have been recognized as an important transportation and depositional mechanism for accumulating thick successions of fine-grained sediments. Through a comprehensive review and synthesis of global research on FGSGF deposition, the characteristics,depositional mechanisms, and distribution patterns of fine-grained sediment gravity-flow deposits(FGSGFD) are discussed, and future research prospects are clarified. In addition to the traditionally recognized low-density turbidity current and muddy debris flow, wave-enhanced gravity flow, lowdensity muddy hyperpycnal flow, and hypopycnal plumes can all form widely distributed FGSGFD. At the same time, the evolution of FGSGF during transportation can result in transitional and hybrid gravityflow deposits. The combination of multiple triggering mechanisms promotes the widespread development of FGSGFD, without temporal and spatial limitations. Different types and concentrations of clay minerals, organic matters, and organo-clay complexes are the keys to controlling the flow transformation of FGSGF from low-concentration turbidity currents to high-concentration muddy debris flows. Further study is needed on the interaction mechanism of FGSGF caused by different initiations, the evolution of FGSGF with the effect of organic-inorganic synergy, and the controlling factors of the distribution patterns of FGSGFD. The study of FGSGFD can shed some new light on the formation of widely developed thin-bedded siltstones within shales. At the same time, these insights may broaden the exploration scope of shale oil and gas, which have important geological significances for unconventional shale oil and gas.

关键词： Fine-grained sediment gravity-flow Depositional mechanism Transportation and evolution Distribution pattern Shale oil and gas

In-situ formation of a new cation renders perovskite solar modules with a record efficiency and long-term stability

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第2期68卷 409-410页

作者： Shanxiao lin Xixing Wen Xiuwen Xu College of Electronic and Optical Engineering and College of Flexible Electronics(Future Technology) Nanjing University of Posts and TelecommunicationsNanjing 210023China

Over the past 14 years,the efficiency of perovskite solar cells has surged from 3.8% to 26.7%[1],establishing it as an unrivaled choice for next-generation ***,maintaining the long-term stability of perovskite solar modules(PSMs)remains a *** particular,the thermal-and light-induced changes in crystal structure,composition,and optoelectronic properties are the primary causes of device degradation,currently considered the Achilles’heel that hinders its commercialization[2–4].Now,writing in Science,Ding et al.[5]achieve a milestone by overcoming the thermal-and light-induced degradation,rendering the PSM with a record efficiency of 23.2% and a T80(time to 20% efficiency loss)over 4,000 h at 85℃ and 85%relative humidity(RH)under light *** key behind this milestone is to utilize the cation reactivity to in-situ form methyl tetrahydrotriazinium([MTTZ]+,a new cation)and dimethylammonium([DMA]+)in precursor solution(Figure 1a).These cations remarkably modulate perovskite crystallization and stabilize the perovskite.

关键词： perovskite stability modules

Upper Bounds on the Multicolor Ramsey Numbers r_(k)(C_(4))

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2025年第1期41卷 286-294页

作者： Tian-yu LI Qi-zhong lin Center for Discrete Mathematics Fuzhou UniversityFuzhou 350108China

The multicolor Ramsey number r_(k)(C_(4))is the smallest integer N such that any k-edge coloring of KN contains a monochromatic C_(4).The current best upper bound of r_(k)(C_(4))was obtained by Chung(1974)and independently by Irving(1974),i.e.,r_(k)(C_(4))≤k^(2)+k+1 for all k≥*** is no progress on the upper bound since *** this paper,we improve the upper bound of r_(k)(C_(4))by showing that r_(k)(C_(4))≤k^(2)+k-1 for even k≥*** improvement is based on the upper bound of the Turan number ex(n,C4),in which we mainly use the double counting method and many novel ideas from Firke,Kosek,Nash,and Williford[***,Ser.B 103(2013),327-336].

关键词： Multicolor Ramsey number Turan number 4-cycle

The profound review of Fenton process:What’s the next step?

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第1期147卷 114-130页

作者： Yimin lin Junlian Qiao Yuankui Sun Hongyu Dong State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China Department of Environmental Science School of Ecological and Environmental SciencesEast China Normal UniversityShanghai 200241China

Fenton and Fenton-like processes,which could produce highly reactive species to degrade organic contaminants,have been widely used in the field of wastewater ***,the chemistry of Fenton process including the nature of active oxidants,the complicated reactions involved,and the behind reason for its strongly pH-dependent performance,is the basis for the application of Fenton and Fenton-like processes in wastewater ***,the conflicting views still exist about the mechanism of the Fenton *** instance,reaching a unanimous consensus on the nature of active oxidants(hydroxyl radical or tetravalent iron)in this process remains *** review comprehensively examined the mechanism of the Fenton process including the debate on the nature of active oxidants,reactions involved in the Fenton process,and the behind reason for the pH-dependent degradation of contaminants in the Fenton ***,we summarized several strategies that promote the Fe(Ⅱ)/Fe(Ⅲ)cycle,reduce the competitive consumption of active oxidants by side reactions,and replace the Fenton reagent,thus improving the performance of the Fenton ***,advances for the future were proposed including the demand for the high-accuracy identification of active oxidants and taking advantages of the characteristic of target contaminants during the degradation of contaminants by the Fenton process.

关键词： Advanced oxidation process Fenton Hydroxyl radical Fe(IV) Wastewater treatment

Profiles,exposure assessment and expanded screening of PAHs and their derivatives in one petroleum refinery facility of China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第1期147卷 550-560页

作者： Ning Wang Fengjiao Jiang lin Xu Yaqi Cai School of Municipal and Environmental Engineering Shandong Jianzhu UniversityJinan 250101China Resource and Environmental Innovation Institute Shandong Jianzhu UniversityJinan 250101China State Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environment Hangzhou Institute for Advanced StudyUCASHangzhou 330106China Hubei Key Laboratory of Environmental and Health Effects of Persistence Toxic Substances Institute of Environment and HealthJianghan UniversityWuhan 430056China

This study investigated environmental distribution and human exposure of polycyclic aromatic hydrocarbons(PAHs)and their derivatives in one Chinese petroleum refinery *** was found that,following with high concentrations of 16 EPA PAHs(∑Parent-PAHs)in smelting subarea of studied petroleum refinery facility,total derivatives of PAHs[named as XPAHs,including nitro PAHs(NPAHs),chlorinated PAHs(Cl-PAHs),and brominated PAHs(Br-PAHs)]in gas(mean=1.57×10^(4)ng/m^(3)),total suspended particulate(TSP)(mean=4.33×10^(3) ng/m^(3))and soil(mean=4.37×10^(3) ng/g)in this subarea had 1.76-6.19 times higher levels than those from other subareas of this facility,surrounding residential areas and reference areas,indicating that petroleum refining processes would lead apparent derivation of ***,compared with those in residential and reference areas,gas samples in the petrochemical areas had higher∑NPAH/∑PAHs(mean=2.18),but lower∑Cl-PAH/∑PAHs(mean=1.43×10^(-1))and∑Br-PAH/∑PAHs ratios(mean=7.49×10^(-2)),indicating the richer nitrification of PAHs than chlorination during petrochemical *** occupational exposure to PAHs and XPAHs in this petroleum refinery facility were 24-343 times higher than non-occupational exposure,and the ILCR(1.04×10^(-4))for petrochemical workers was considered to be potential high ***,one expanded high-resolution screening through GC Orbitrap/MS was performed for soils from petrochemical area,and another 35 PAHs were found,including alkyl-PAHs,phenyl-PAHs and other species,indicat-ing that profiles and risks of PAHs analogs in petrochemical areas deserve further expanded investigation.

关键词： Polycyclic aromatic hydrocarbons(PAHs) Derivatives Petroleum refinery Human exposure Non-targeted screening

Soil colloids can significantly enhance spreading of polybromodiphenyl ethers in groundwater by serving as an effective carrier

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2025年第1期147卷 93-100页

作者： lin Duan Min Li Jiameng Liu Wei Chen College of Environmental Science and Engineering Ministry of Education Key Laboratory of Pollution Processes and Environmental CriteriaTianjin Key Laboratory of Environmental Remediation and Pollution ControlNankai UniversityTianjin 300350China

Polybromodiphenyl ethers(PBDEs),the widely used flame retardants,are common contaminants in surface soils at e-waste recycling *** association of PBDEs with soil colloids has been observed,indicating the potential risk to groundwater due to colloid-facilitated ***,the extent to which soil colloidsmay enhance the spreading of PBDEs in groundwater is largely ***,we report the co-transport of decabromodiphenyl ester(BDE-209)and soil colloids in saturated porous *** colloids released froma soil sample collected at an e-waste recycling site in Tianjin,China,contain high concentration of PBDEs,with BDE-209 being the most abundant conger(320±30 mg/kg).The colloids exhibit relatively high mobility in saturated sand columns,under conditions commonly observed in groundwater ***,under all the tested conditions(i.e.,varying flow velocity,pH,ionic species and ionic strength),the mass of eluted BDE-209 correlates linearly with that of eluted soil colloids,even though the mobility of the colloids varies markedly depending on the specific hydrodynamic and solution chemistry conditions ***,the mass of BDE-209 retained in the columns also correlates strongly with themass of retained ***,the PBDEs remain bound to soil colloids during transport in porous *** in this study indicate that soil colloidsmay significantly promote the transport of PBDEs in groundwater by serving as an effective *** might be the reason why the highly insoluble and adsorptive PBDEs are found in groundwater at some PBDE-contaminated sites.

关键词： Polybromodiphenyl ethers Soil colloids E-waste recycling sites Groundwater Facilitated transport

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

面向向量部件的指数和对数函数优化方法

计算机工程与科学 2025年第1期47卷 18-26页

作者：沈洁龙标黄春唐滔彭林国防科技大学计算机学院湖南长沙410073

指数和对数函数是浮点计算中重要的超越函数,在不同应用领域使用广泛。现代处理器向量寄存器宽度呈现逐代增加的趋势,为了进一步提高上层应用对向量部件的利用率,研究向量指数和对数函数优化方法具有重要的科学价值和现实意义。针对现... 详细信息

指数和对数函数是浮点计算中重要的超越函数,在不同应用领域使用广泛。现代处理器向量寄存器宽度呈现逐代增加的趋势,为了进一步提高上层应用对向量部件的利用率,研究向量指数和对数函数优化方法具有重要的科学价值和现实意义。针对现有向量函数实现的性能瓶颈,设计和实现了面向向量部件的指数和对数函数优化方法,包括基于硬件加速指令的向量查表优化、分支优化和精度性能取舍优化。模拟器上的实验表明,优化实现的向量指数和对数函数均达到业界高精度标准,函数性能优于当前最佳开源实现,加速比达1.44以上。真实应用测试进一步表明,应用程序在优化的向量函数支持下可以实现高效向量化,相比原始标量实现平均性能提升达2.53倍。

关键词：指数函数对数函数向量化查表优化硬件加速指令

面向联合补货-配送问题的ε-最优算法和对偶下界

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

管理科学学报 2025年第2期28卷 85-101页

作者：王思睿王林吴彬溶张金隆华中科技大学管理学院

针对多物品库存系统中常见的联合补货-配送问题，挖掘了其数学模型中的一系列性质，并提出了一种ε-最优算法和一个对偶下界.实验结果表明，本文设计的算法效果超过了现有研究中表现最好的几种元启发式算法，对目标值的提升幅度最高能达... 详细信息

针对多物品库存系统中常见的联合补货-配送问题，挖掘了其数学模型中的一系列性质，并提出了一种ε-最优算法和一个对偶下界.实验结果表明，本文设计的算法效果超过了现有研究中表现最好的几种元启发式算法，对目标值的提升幅度最高能达到31%,对偶下界与最优值的偏差较小，平均不超过0.84%.新算法运算效率较高，100个商品的算例平均运算时间不超过23秒.此外，本文还对算法时间复杂度进行了分析，在实际应用环境中，该算法能够达到O(n)级多项式时间复杂度，这一结论可为联合补货-配送问题的算法设计理论提供有益的补充.最后，对协同配送策略的效益进行了分析.实验发现，只有当中心仓库的库存管理水平相比零售商处的库存管理水平有较大优势时，协同配送才能够取得较高的成本节约效益.

关键词：联合补货-配送 Lipschitz优化 ε-最优定界启发式算法对偶下界

右美托咪啶与咪达唑仑在重症破伤风患者镇静中效果比较

在线全文

学校读者我要写书评

暂无评论

现代生物医学进展 2017年第6期17卷 1160-1162,1134页

作者：李旭忠吴德龙姜龙林凤琴许香香南通大学附属东台医院急诊科江苏东台224200

目的:比较右美托咪啶与咪达唑仑用于重症破伤风患者镇静中效果。方法:选取2012年1月~2015年12月间在我院治疗的重症破伤风患者72例,通过随机数表法分为右美托咪啶组与咪达唑仑组,各36例,给予右美托咪啶组静脉泵入右美托咪啶1μg/kg持续... 详细信息

目的:比较右美托咪啶与咪达唑仑用于重症破伤风患者镇静中效果。方法:选取2012年1月~2015年12月间在我院治疗的重症破伤风患者72例,通过随机数表法分为右美托咪啶组与咪达唑仑组,各36例,给予右美托咪啶组静脉泵入右美托咪啶1μg/kg持续时间为10 min,之后以0.3~0.6μg/kg进行维持,咪达唑仑组静脉泵入咪达唑仑0.05 mg/kg,持续时间为1 min,之后以0.02~0.1/kg·h进行维持。监测两组患者用药前及用药12 h后平均动脉压(MAP)、呼吸频率(RR)、血氧饱和度(SpO_2)和心率(HR)深用Ramasy评分法评估镇静程度。结果:两组患者治疗后HR、RR、MAP水平明显降低而SpO_2明显上升且右美托咪啶组HR、RR、及SpO_2改善更显著差异均有统计学意义(P0.05);右美托咪啶组不良反应发生率为5.56%,低于咪达唑仑组的16.67%,差异有统计学意义(P<0.05)。结论右美托咪啶有助于维持患者血流动力学的稳定减少重症破伤风患者心动过速、心率增快、呼吸抑制等不良反应情况的发生。

关键词：右美托咪啶咪达唑仑重症破伤风镇静