检索结果-南通市图书馆

Science China Chemistry 2024年第7期67卷 2300-2305页

作者： Zhiyan Chen yan lv Wei Qin College of Physics Qingdao UniversityQingdao 266071China School of Physics State Key Laboratory of Crystal MaterialsShandong UniversityJinan 250100China Shandong Linuo Photovoltaic Hi-Tech Co. Ltd.Jinan 250100China

Multicomponent self-assembled chiral systems have attracted great attention due to their promising application in the area of spin-photonics and optoelectronics.In this work,through introducing an achiral third component into an achiral binary crystal,a chiral organic ternary crystal is fabricated,where both pronounced chiral-optical coupling and magnetic field dependence of chiral-optical activities are observed.The transformation of achiral structure into chiral structure generates a significant effect on the polarized state of light and the electron spin resonance signals.Moreover,the coupling between circularly polarized photon and spin is observed in chiral ternary crystal with pronounced chiral orbit,where obvious magnetic field-transmissivity loop is generated.Furthermore,temperature could increase the magnitude of lattice parameters to lead to a larger helix radius to increase the chiral orbit effect.Overall,this work indicates that the further exploration of photon-chiral orbit-spin interactions in organic chiral ternary crystals is promising.

关键词： organic chiral ternary crystals chiral orbit chiral-optical activities magnetic field

A novel responsive stabilizing Janus nanosilica as a nanoplugging agent in water-based drilling fluids for exploiting hostile shale environments

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 1190-1210页

作者： Alain Pierre Tchameni lv-yan Zhuo Lesly Dasilva Wandji Djouonkep Robert Dery Nagre Lu-Xin Chen Lin Zhao Chao Ma Bin-Qiang Xie College of Petroleum Engineering Yangtze UniversityWuhan430100HubeiChina Key Laboratory of Drilling and Production Engineering for Oil and Gas HubeiChina Lost Circulation Control Laboratory National Engineering Laboratory for Petroleum Drilling EngineeringYangtze UniversityWuhan430100HubeiChina College of Petroleum Engineering Shandong Institute of Petroleum and Chemical TechnologyDongying257061ShandongChina Petroleum Engineer Research Institute of Petrochina Dagang Oilfield Tianjin300280China Department of Chemical Engineering Kumasi Technical UniversityP.O.Box 854KumasiGhana

Thermo-responsive nanocomposites have recently emerged as potential nanoplugging agents for shale stabilization in high-temperature water-based drilling fluids(WBDFs). However, their inhibitory properties have not been very effective in high-temperature drilling operations. Thermo-responsive Janus nanocomposites are expected to strongly interact with clay particles from the inward hemisphere of nanomaterials, which drive the establishment of a tighter hydrophobic membrane over the shale surface at the outward hemisphere under geothermal conditions for shale stabilization. This work combines the synergistic benefits of thermo-responsive and zwitterionic nanomaterials to synchronously enhance the chemical inhibitions and plugging performances in shale under harsh conditions. A novel thermoresponsive Janus nanosilica(TRJS) exhibiting zwitterionic character was synthesized, characterized,and assessed as shale stabilizer for WBDFs at high temperatures. Compared to pristine nanosilica(Si NP)and symmetrical thermo-responsive nanosilica(TRS), TRJS exhibited anti-polyelectrolyte behaviour, in which electrolyte ions screened the electrostatic attraction between the charged particles, potentially stabilizing nanomaterial in hostile shaly environments(i.e., up to saturated brine or API brine). Macroscopically, TRJS exhibited higher chemical inhibition than Si NP and TRS in brine, prompting a better capability to control pressure penetration. TRJS adsorbed onto the clay surface via chemisorption and hydrogen bonding, and the interactions became substantial in brine, according to the results of electrophoretic mobility, surface wettability, and X-ray diffraction. Thus, contributing to the firm trapping of TRJS into the nanopore structure of the shale, triggering the formation of a tight hydrophobic membrane over the shale surface from the outward hemisphere. The addition of TRJS into WBDF had no deleterious effect on fluid properties after hot-treatment at 190℃, implying that TRJS could find potential use as a shale stabilizer

关键词： Janus nanosilica Thermo-responsive copolymer Anti-polyelectrolyte effect Shale stabilizer Inhibition Plugging Drilling fluid

Clinical comprehensive treatment protocol for managing diabetic foot ulcers:A retrospective cohort study

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2024年第17期12卷 2976-2982页

作者： yan-Bin Wang yan lv Guang-Yu Li Ji-Ting Zheng Qing-Xin Jiang Ran Wei Department of Vascular Surgery Harbin 242 HospitalHarbin 150066Heilongjiang ProvinceChina First Department of General Surgery Harbin 242 HospitalHarbin 150066Heilongjiang ProvinceChina

BACKGROUND Diabetic foot ulcers(DFUs)are a common complication of diabetes,often leading to severe infections,amputations,and reduced quality of life.The current standard treatment protocols for DFUs have limitations in promoting efficient wound healing and preventing complications.A comprehensive treatment approach targeting multiple aspects of wound care may offer improved outcomes for patients with DFUs.The hypothesis of this study is that a comprehensive treatment protocol for DFUs will result in faster wound healing,reduced amputation rates,and improved overall patient outcomes compared to standard treatment protocols.AIM To compare the efficacy and safety of a comprehensive treatment protocol for DFUs with those of the standard treatment protocol.METHODS This retrospective study included 62 patients with DFUs,enrolled between January 2022 and January 2024,randomly assigned to the experimental(n=32)or control(n=30)group.The experimental group received a comprehensive treatment comprising blood circulation improvement,debridement,vacuum sealing drainage,recombinant human epidermal growth factor and anti-inflammatory dressing,and skin grafting.The control group received standard treatment,which included wound cleaning and dressing,antibiotics administration,and surgical debridement or amputation,if necessary.Time taken to reduce the white blood cell count,number of dressing changes,wound healing rate and time,and amputation rate were assessed.RESULTS The experimental group exhibited significantly better outcomes than those of the control group in terms of the wound healing rate,wound healing time,and amputation rate.Additionally,the comprehensive treatment protocol was safe and well tolerated by the patients.CONCLUSION Comprehensive treatment for DFUs is more effective than standard treatment,promoting granulation tissue growth,shortening hospitalization time,reducing pain and amputation rate,improving wound healing,and enhancing quality of life.

关键词： Diabetic foot ulcers Comprehensive treatment protocol Clinical study White blood cell count Wound healing Amputation rate

Root cause of corrosion failure of tin coating on wire clamp in marine atmosphere

维普期刊数据库评论

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 Iron and Steel Research(International) 2024年第4期31卷 998-1014页

作者： Zhen Zhong Wang-yan Ly Teng-yuan Liu Yi Xie yang yang Zhen-zhu Wang Deng-ke Li Xiao-bo Li Tang-qing Wu School of Materials Science and Engineering Xiangtan UniversityXiangtan 411105HunanChina Electric Power Research Institute of Guangdong Power Grid Co. Ltd.Guangzhou 510080GuangdongChina Shenyang National L aboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016LiaoningChina School of Materials Science and Engineering.University of Science and Technology of China Shenyang 110016LiaoningChina Electric Power Research Institute State Grid Hunan Electric Power CompanyChangsha 410007HunanChina School of Mechanical Engineering and Mechanics Xiangtan UniversityXiangtan 411105HunanChina School of Information Science and Engineering Changsha Normal UniversityChangsha 410199HunanChina

The failure cause of a tinned copper wire clamp in marine atmosphere was studied systematically by X-ray photoelectron spectroscopy,scanning electron microscopy with energy dispersive spectroscopy and electrochemical measurements.The main components of the green rust on the surface of the damaged wire clamp are SnO_(2),CuO,Cu_(2)Cl(OH)_(3) and CuCO(OH)_(2).Much of green rust distributes at the platform edge along the axial direction on the crimp connection,and severe corrosion and corrosion pits occur at the platform edge zone along the axial direction.The enriching Cl-at the marine atmosphere and the existing O_(2) in air collectively enhance the corrosion process of the tin coating and the copper matrix.Finite element model results show that the residual stress and strain of the tin coating are the largest at the platform edge along the axial direction on the crimp connection,and the corresponding electrode potential of the tin coating at this zone drops significantly.The above results indicate that the residual strain increases the driving force of the corrosion electrochemical reactions and accelerates the corrosion rate and the pit corrosion of the tin coating at this zone.

关键词： Tin coating Marine atmosphere Residual strain-Chloride ion Corrosion failure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

汉英双语幼儿早期多语码词汇发展个案研究

陕西学前师范学院学报 2024年第6期40卷 70-76页

作者：吕燕广西大学外国语学院广西南宁530004

儿童早期词汇的获得和发展对儿童具有重要意义,研究儿童词汇量增长是早期语言发展研究的一个重要方面。本文追踪了一名汉英双语多语码儿童出生后到两岁之间的普通话、粤语和英语的早期词汇获得,从最初词汇、五十个词的里程碑、词汇爆发... 详细信息

儿童早期词汇的获得和发展对儿童具有重要意义,研究儿童词汇量增长是早期语言发展研究的一个重要方面。本文追踪了一名汉英双语多语码儿童出生后到两岁之间的普通话、粤语和英语的早期词汇获得,从最初词汇、五十个词的里程碑、词汇爆发和非常规意义匹配四个方面进行研究,结果发现该名儿童的普通话词汇发展与汉语儿童的相似,且词汇语义快速发展的标志为泛化现象明显增加,与情感因素挂钩;粤语和英语词汇发展缓慢,有日趋停止的可能。

关键词：汉英双语儿童多语码词汇发展个案研究

在线全文

学校读者我要写书评

暂无评论

重污染企业数字化转型对绿色生产效率的影响

技术经济与管理研究 2024年第3期 13-19页

作者：吕娟吕雁琴杨平陈静新疆大学经济与管理学院新疆乌鲁木齐830046 新疆大学商学院新疆乌鲁木齐830046

以2015—2020年重污染行业的上市企业为研究对象,借助非期望产出的超效率SBM模型衡量企业绿色生产效率,通过固定效应模型探究重污染企业数字化转型对绿色生产效率的影响。研究发现:重污染企业数字化转型能显著提升其绿色生产效率;重污... 详细信息

以2015—2020年重污染行业的上市企业为研究对象,借助非期望产出的超效率SBM模型衡量企业绿色生产效率,通过固定效应模型探究重污染企业数字化转型对绿色生产效率的影响。研究发现:重污染企业数字化转型能显著提升其绿色生产效率;重污染企业数字化转型可以通过提升企业创新水平,以及抑制债务融资成本,进而提升绿色生产效率;重污染企业数字化转型对绿色生产效率的影响程度因受经济因素、区位因素、产权性质的影响而不同,较高水平的数字化转型对绿色生产效率的影响更显著,处于省会城市的重污染企业数字化转型对绿色生产效率的效应更明显,国有控股的重污染企业数字化转型对绿色生产效率的效应更突出。

关键词：重污染企业数字化转型绿色生产效率

在线全文

学校读者我要写书评

暂无评论

21世纪马克思主义释义

哈尔滨工业大学学报（社会科学版） 2024年第1期26卷 18-24页

作者：吕妍徐晓风黑龙江省社会科学院马克思主义研究所哈尔滨150028 哈尔滨师范大学马克思主义学院哈尔滨150025

开放性是马克思主义具有的本质特征之一,在其不断发展的过程中,与各国实际相结合,与时代特征相适应,促进其本土化发展,并保持其生命活力。21世纪马克思主义是世界社会主义的创新成果、崭新阶段,它以马克思主义为模版,体现了守正创新、... 详细信息

开放性是马克思主义具有的本质特征之一,在其不断发展的过程中,与各国实际相结合,与时代特征相适应,促进其本土化发展,并保持其生命活力。21世纪马克思主义是世界社会主义的创新成果、崭新阶段,它以马克思主义为模版,体现了守正创新、与时俱进的基本特征;在指导中国式现代化建设道路上秉承根植中国、胸怀天下的原则;面对“两个大局”的时代主题,发挥着解释世界、引领世界的重要作用。充分理解21世纪马克思主义的具体含义,有助于更好地运用与发展该理论。

关键词： 21世纪马克思主义开放性两个大局中国式现代化

素养立意的义务教育化学学业水平考试试题研究——以2023年连云港市义务教育学业水平考试化学第38题为例

在线全文

学校读者我要写书评

暂无评论

化学教学 2024年第1期 89-93页

作者：刘文兵吕艳连云港市教育局教研室江苏连云港222006 连云港市赣榆区教育局教研室江苏连云港222100

通过题例分析了素养立意的试题命制特征及其关键能力的考查情况。对义务教育学业水平考试命题进行两点反思:一是要融通义务教育化学课程标准中的学业质量与素养要求,二是要明晰素养立意下关键能力的考查路径。

关键词：命题素养立意关键能力

区域旅游资源极化及因应对策——以湖北省恩施州为例

在线全文

学校读者我要写书评

暂无评论

中南民族大学学报（人文社会科学版） 2024年第4期44卷 79-87,219,220页

作者：高华峰吕彦卓湖北民族大学经济与管理学院湖北恩施445000

旅游资源禀赋决定了区域旅游发展路径选择和发展水平。以恩施州省级度假区和4A级及以上景区为样本,运用核密度、最邻近指数方法,分析恩施州各县市旅游景区空间结构演化特征、旅游相关因子发展水平,结合旅游相关因子分析,确定高等级旅游... 详细信息

旅游资源禀赋决定了区域旅游发展路径选择和发展水平。以恩施州省级度假区和4A级及以上景区为样本,运用核密度、最邻近指数方法,分析恩施州各县市旅游景区空间结构演化特征、旅游相关因子发展水平,结合旅游相关因子分析,确定高等级旅游景区协调因子指标,采用耦合协调度方法分析各县市旅游相关因子的协调程度,评价恩施州旅游发展条件。恩施州应以系统观为指导,发挥优势因子带动作用,综合提升区域耦合协调度水平,创建区域旅游协同品牌,减轻旅游景区的空间极化,以推进旅游协同发展,以旅游发展带动乡村全面振兴。

关键词：旅游景区空间结构极化分布耦合协调度

Social Evaluation and Suggestions about Creating the Civilized City——Based on the Investigation of 761 yangzhou Citizens

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

Social Evaluation and Suggestions about Creating the Civiliz...