检索结果-南通市图书馆

绿色金融对碳排放的影响研究——基于产业结构和技术创新路径

在线全文

学校读者我要写书评

暂无评论

天津商务职业学院学报 2024年第1期12卷 33-41页

作者：金世玉杭州电子科技大学浙江杭州310018

本文选取2006-2021年我国30个省级层面数据衡量我国绿色金融发展现状,以技术创新、产业结构作为中间变量,使用TOPSIS-熵权法构建绿色金融指数,探究绿色金融对于碳排放的影响路径。研究结果表明,产业结构升级和技术创新都是绿色金融实现... 详细信息

本文选取2006-2021年我国30个省级层面数据衡量我国绿色金融发展现状,以技术创新、产业结构作为中间变量,使用TOPSIS-熵权法构建绿色金融指数,探究绿色金融对于碳排放的影响路径。研究结果表明,产业结构升级和技术创新都是绿色金融实现降低碳排放强度的有效路径。同时,针对研究结果,相关部门应采取建立健全绿色金融发展体系,推动完善绿色金融制度体系和市场建设;进一步完善绿色技术创新体系,推动建立绿色创新平台,引导绿色金融流向环保和低碳技术研发;推进传统产业绿色升级改造,扩大绿色产业市场规模和市场份额;因地制宜开展相关试点示范工作,探索绿色金融推动地区可持续发展的经验方法等措施以尽快实现双碳目标。

关键词：绿色金融碳排放产业结构技术创新

Characterization of a Novel Rice Metallothionein Gene Promoter:Its Tissue Specificity and Heavy Metal Responsiveness

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2010年第10期52卷 914-924页

作者： Chun-Juan Dong yun Wang shi-shi yu jin-yuan Liu Laboratory of Molecular Biology and MOE Laboratory of Protein Science School of Life Sciences Tsinghua University Beijing 100084China

The rice （Oryza sativa L.） metallothionein gene OsMT-I-4b has previously been identified as a type I MT gene. To elucidate the regulatory mechanism involved in its tissue specificity and abiotic induction, we isolated a 1 730 bp fragment of the OsMT-I-4b promoter region. Histochemical /^-glucuronidase （GUS） staining indicated a precise spacial and temporal expression pattern in transgenic Arabidopsis. Higher GUS activity was detected in the roots and the buds of flower stigmas, and relatively lower GUS staining in the shoots was restricted to the trichomes and hydathodes of leaves. No activity was observed in the stems and seeds. Additionally, in the root of transgenic plants, the promoter activity was highly upregulated by various environmental signals, such as abscisic acid, drought, dark, and heavy metals including Cu2＋, Zn2~, Pb2~ and Al3＋. Slight induction was observed in transgenic seedlings under salinity stress, or when treated with Co2＋ and Cd2＋. Promoter analysis of 5＇-deletions revealed that the region -583/-1 was sufficient to drive strong GUS expression in the roots but not in the shoots. Furthermore, deletion analysis indicated important promoter regions containing different metal- responsive c/s-elements that were responsible for responding to different heavy metals. Collectively, these findings provided important insight into the transcriptional regulation mechanisms of the OsMT-I- 4b promoter, and the results also gave us some implications for the potential application of this promoter in plant genetic engineering.

关键词： Mechanization Mechanics Genes Heavy metals Imports Shoots Plants Planting Metals Transgenics

论食品加工与安全领域农业硕士培养存在的问题与解决途径

在线全文

学校读者我要写书评

暂无评论

教育教学论坛 2024年第25期 177-180页

作者：金诗语罗思王道营王朝宇淮阴工学院生命科学与食品工程学院江苏淮安223003 江苏省农业科学院农产品加工研究所江苏南京210014

从师资队伍建设、实践能力培养、实践基地建设、课程体系建设及培养环节控制等方面,系统梳理了我国高等院校食品加工与安全领域专业学位研究生人才培养过程中存在的问题,并针对这些问题提出了5大解决途径:完善校外导师遴选与考核机制,... 详细信息

从师资队伍建设、实践能力培养、实践基地建设、课程体系建设及培养环节控制等方面,系统梳理了我国高等院校食品加工与安全领域专业学位研究生人才培养过程中存在的问题,并针对这些问题提出了5大解决途径:完善校外导师遴选与考核机制,构建校内外导师沟通合作平台;健全专业实践管理与考核机制,以职业需求引导专业实践教育;建立优质稳定多样的实践基地,制定严格合理灵活的管理机制;优化专业学位研究生课程体系,鼓励模块课程教学和案例教学;加强研究生培养过程质量控制,严格保证研究生毕业论文质量。研究结果可为我国高等院校食品加工与安全领域专业学位研究生培养提供科学指导。

关键词：食品加工与安全专业学位研究生人才培养

A real-time intelligent lithology identification method based on a dynamic felling strategy weighted random forest algorithm

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 1135-1148页

作者： Tie Yan Rui Xu shi-Hui Sun Zhao-Kai Hou jin-yu Feng School of Petroleum Engineering Northeast Petroleum UniversityDaqing163318HeilongjiangChina Sanya Offshore Oil&Gas Research Institute Northeast Petroleum UniversitySanya572025HainanChina

Real-time intelligent lithology identification while drilling is vital to realizing downhole closed-loop drilling. The complex and changeable geological environment in the drilling makes lithology identification face many challenges. This paper studies the problems of difficult feature information extraction,low precision of thin-layer identification and limited applicability of the model in intelligent lithologic identification. The author tries to improve the comprehensive performance of the lithology identification model from three aspects: data feature extraction, class balance, and model design. A new real-time intelligent lithology identification model of dynamic felling strategy weighted random forest algorithm(DFW-RF) is proposed. According to the feature selection results, gamma ray and 2 MHz phase resistivity are the logging while drilling(LWD) parameters that significantly influence lithology identification. The comprehensive performance of the DFW-RF lithology identification model has been verified in the application of 3 wells in different areas. By comparing the prediction results of five typical lithology identification algorithms, the DFW-RF model has a higher lithology identification accuracy rate and F1 score. This model improves the identification accuracy of thin-layer lithology and is effective and feasible in different geological environments. The DFW-RF model plays a truly efficient role in the realtime intelligent identification of lithologic information in closed-loop drilling and has greater applicability, which is worthy of being widely used in logging interpretation.

关键词： Intelligent drilling Closed-loop drilling Lithology identification Random forest algorithm Feature extraction

High-Temperature Stability of Mg-1Al-12Y Alloy Containing LPSO Phase and Mechanism of Its Portevin-Le Chatelier(PLC)Effect

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 982-998页

作者： Qian-Long Ren Shuai yuan shi-yu Luan jin-Hui Wang Xiao-Wei Li Xiao-yu Liu Qinghai Provincial Key Laboratory of New Light Alloys Qinghai Provincial Engineering Research Center of High Performance Light Metal Alloys and FormingQinghai UniversityXining810016China School of Materials Science and Engineering Shenyang University of TechnologyShenyang110870China

In this study,the high-temperature stability and the generation mechanism of the Portevin-Le Chatelier(PLC)effect in solid-solution Mg-1Al-12Y alloy with different heat treatment processes were investigated by adjusting the content of long-period stacking ordered(LPSO)*** was found that the content of LPSO phases in the alloys differed the most after heat treatment at 530℃for 16 h and 24 h,with values of 13.56%and 3.93%***,high-temperature tensile experiments were conducted on these two alloys at temperatures of 150℃,200℃,250℃,and 300℃.The results showed that both alloys exhibited the PLC effect at temperatures ranging from 150 to 250℃.However,at a temperature 300℃,only the alloy with a greater concentration of LPSO phases exhibited the PLC effect,whereas the alloy with a lower proportion of LPSO phases did not exhibit this ***,both alloys exhibited remarkable high-temperature stability,with the alloy containing a greater percentage of LPSO phases also demonstrating superior *** underlying mechanism for this phenomenon lies in the exceptional high-temperature stability exhibited by the second phase within the ***,the LPSO phase effectively obstructs the movement of dislocations,and it also undergoing kinking to facilitate plastic deformation of the *** results indicate that the PLC effect can be suppressed by reducing dislocation pile-up at grain boundaries,which leads to a decrease in alloy plasticity but an increase in *** presence of the PLC effect in the WA121 alloy is attributed to the abundant dispersed second phase within the alloy,which initially hinders the movement of dislocations,leading to an increase in stress,and subsequently releases the dislocations,allowing them to continue their movement and thereby reducing in stress.

关键词： Magnesium alloy Long-period stacking ordered(LPSO)phase Portevin-Le Chatelier effect High temperature

Natural products inspired[3+2]cycloaddition enables efficient construction of hydroxylated tetrahydrofuran acetals and concise syntheses of lignans

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

Science China Chemistry 2024年第7期67卷 2306-2313页

作者： Dong-yue Cai Weiming shi Zhao-Hui jin Zhi-Xiang yu jin-Xin Zhao Jian-Min yue State Key Laboratory of Drug Research Shanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China University of Chinese Academy of Sciences Beijing 100049China Beijing National Laboratory for Molecular Sciences(BNLMS) Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of EducationCollege of ChemistryPeking UniversityBeijing 100871China

Mimicking biosynthetic pathways of hongkonoids led to the development of a new Cu(Ⅰ)-catalyzed[3+2]cycloaddition ofα-hydroxyketone andβ-keto enol ethers,affording tetrahydrofuran acetals in a highly diastereoselective manner and 100%atom *** studies on the mechanism disclosed a concerted but asynchronous Michael addition/aldol *** the same importance,this methodology provides a practical biomimetic approach for one-step construction of the dibenzylbutyrolactol lignan backbone starting from two phenyl propane derivatives,opening up a powerful new approach for lignan synthesis,which is showcased by succinct total syntheses of two biologically important aryltetralin-type lignans,β-apopicropodophyllin and *** the mild and operationally simple conditions,the developed chemistry might have a promising prospect in potential industrial applications.

关键词： [3+2]cycloaddition transition-metal catalysis tetrahydrofuran lignans natural products

在线全文

学校读者我要写书评

暂无评论

微流控结晶系统制备窄分布微米级硝胺炸药

含能材料 2024年第3期32卷 256-269页

作者：夏皓轩石锦宇刘津搏周星屹费翼鹏宁爵勇刘立朱朋沈瑞琪南京理工大学化学与化工学院江苏南京210094 微纳含能器件工业和信息化部重点实验室江苏南京210094 中国工程物理研究院化工材料研究所四川绵阳621999

为了在安全临界尺度下实现炸药结晶的调控与批量生产,基于微流控技术组建了ZS-1型微流控结晶系统,并选用二甲亚砜(DMSO)和去离子水分别作为溶剂与反溶剂,通过改变两相流量比、炸药相浓度与总流量等结晶过程参数,在微尺度下进行了环三亚... 详细信息

为了在安全临界尺度下实现炸药结晶的调控与批量生产,基于微流控技术组建了ZS-1型微流控结晶系统,并选用二甲亚砜(DMSO)和去离子水分别作为溶剂与反溶剂,通过改变两相流量比、炸药相浓度与总流量等结晶过程参数,在微尺度下进行了环三亚甲基三硝胺(RDX)的粒度控制研究和环四亚甲基四硝胺(HMX)的粒度与晶型控制研究,探索了结晶参数的高通量筛选。在ZS-1型微流控结晶系统上进行了微米级RDX的批量制备实验。结果表明,经系统重结晶细化的RDX样品的D_(50)为3.35μm,跨度(粒径分布)为0.956,纯度为99.80%,平均粒径较原料RDX缩小了22.2倍,且产量可达每小时百克量级,验证了微尺度下窄分布微米级炸药批量制备的可行性。

关键词：微流控硝胺类炸药重结晶调控柔性制造

高层建筑上部结构施工对邻近软土隧道影响的数值分析

在线全文

学校读者我要写书评

暂无评论

地基处理 2024年第S01期6卷 67-74页

作者：叶观宝田佳乐史玉金许言张振黄弋烓同济大学土木工程学院地下建筑与工程系上海200092 同济大学岩土及地下工程教育部重点实验室上海200092 上海市地质调查研究院上海200072

已有研究表明,高层建筑从下部至上部的结构施工阶段,以及竣工后运营阶段,都会对邻近的地铁隧道产生影响。然而,目前国内关于高层建筑对邻近隧道影响的研究主要关注下部结构施工阶段,对上部结构施工阶段的研究成果较少。因此,本文针对城... 详细信息

已有研究表明,高层建筑从下部至上部的结构施工阶段,以及竣工后运营阶段,都会对邻近的地铁隧道产生影响。然而,目前国内关于高层建筑对邻近隧道影响的研究主要关注下部结构施工阶段,对上部结构施工阶段的研究成果较少。因此,本文针对城市化进程中高层建筑施工对邻近软土隧道影响的问题展开研究,以上海市某高层商办楼项目为案例,采用Plaxis 3D软件建立三维有限元数值模型,通过现场监测数据验证模型准确性后,分析了坑隧水平间距、坑隧垂直间距和基坑深度对隧道结构内力和变形的影响。研究发现,隧道的最大位移、轨道高差、上下行线差异沉降均会随着坑隧水平间距与隧道中心埋深的增加而减小,随基坑开挖深度的增加变化不明显,3个影响因素对隧道最大弯矩的影响均不明显;此外,3个影响因素对隧道沉降的影响程度相近,但坑隧水平间距为主要影响因素。

关键词：高层建筑上部结构软土盾构隧道数值分析

Suitable region of dynamic optimal interpolation for efficiently altimetry sea surface height mapping

在线全文

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2024年第2期15卷 142-149页

作者： Jiasheng shi Taoyong jin School of Geodesy and Geomatics Hubei Luojia LaboratoryWuhan UniversityWuhan 430079China MOE Key Laboratory of Geospace Environment and Geodesy Wuhan UniversityWuhan 430079China

The dynamic optimal interpolation(DOI)method is a technique based on quasi-geostrophic dynamics for merging multi-satellite altimeter along-track observations to generate gridded absolute dynamic topography(ADT).Compared with the linear optimal interpolation(LOI)method,the DOI method can improve the accuracy of gridded ADT locally but with low computational ***,considering both computational efficiency and accuracy,the DOI method is more suitable to be used only for regional *** this study,we propose to evaluate the suitable region for applying the DOI method based on the correlation between the absolute value of the Jacobian operator of the geostrophic stream function and the improvement achieved by the DOI *** verifying the LOI and DOI methods,the suitable region was investigated in three typical areas:the Gulf Stream(25°N-50°N,55°W-80°W),the Japanese Kuroshio(25°N-45°N,135°E-155°E),and the South China Sea(5°N-25°N,100°E-125°E).We propose to use the DOI method only in regions outside the equatorial region and where the absolute value of the Jacobian operator of the geostrophic stream function is higher than1×10^(-11).

关键词： Dynamic optimal interpolation Linearoptimal interpolation Satellite altimetry Sea surface height Suitable region