检索结果-南通市图书馆

Novel sandwich structured glass fiber Cloth/Poly(ethylene oxide)-MXene composite electrolyte

Nano Materials Science 2024年第1期6卷 60-67页

作者： Yu-Qin Mao Guang-he dong Wei-Bin Zhu Yuan-Qing Li Pei Huang Shao-Yun Fu College of Aerospace Engineering Chongqing UniversityChongqing400044China State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChongqing400044China

Recently,poly(ethylene oxide)(PEO)-based solid polymer electrolytes have been attracting great attention,and efforts are currently underway to develop PEO-based composite electrolytes for next generation high performance all-solid-state lithium metal *** this article,a novel sandwich structured solid-state PEO composite electrolyte is developed for high performance all-solid-state lithium metal *** PEO-based composite electrolyte is fabricated by hot-pressing PEO,LiTFSI and Ti_(3)C_(2)T_(x) MXene nanosheets into glass fiber cloth(GFC).The as-prepared GFC@PEO-MXene electrolyte shows high mechanical properties,good electrochemical stability,and high lithium-ion migration number,which indicates an obvious synergistic effect from the microscale GFC and the nanoscale *** as,the GFC@PEO-1 wt%MXene electrolyte shows a high tensile strength of 43.43 MPa and an impressive Young's modulus of 496 MPa,which are increased by 1205%and 6048%over those of ***,the ionic conductivity of GFC@PEO-1 wt%MXene at 60℃ reaches 5.01×10^(-2) S m^(-1),which is increased by around 200%compared with that of GFC@PEO *** addition,the Li/Li symmetric battery based on GFC@PEO-1 wt%MXene electrolyte shows an excellent cycling stability over 800 h(0.3 mA cm^(-2),0.3 mAh cm^(-2)),which is obviously longer than that based on PEO and GFC@PEO electrolytes due to the better compatibility of GFC@PEO-1 wt%MXene electrolyte with Li ***,the solid-state Li/LiFePO_(4) battery with GFC@PEO-1 wt%MXene as electrolyte demonstrates a high capacity of 110.2–166.1 mAh g^(-1) in a wide temperature range of 25–60C,and an excellent capacity retention *** developed sandwich structured GFC@PEO-1 wt%MXene electrolyte with the excellent overall performance is promising for next generation high performance all-solid-state lithium metal batteries.

关键词： Solid polymer electrolyte Ti_(3)C_(2)T_(x)MXene Poly(ethylene oxide) Glass fiber cloth All-solid-state Li metal Battery

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Yield, Leaf Senescence, and Cry1Ac Expression in Response to Removal of Early Fruiting Branches in Transgenic Bt Cotton

引用

Agricultural Sciences in China 2008年第6期7卷 692-702页

作者： dong he-zhong TANG Wei LI Wei-jiang LI Zhen-huai NIU Yue-hua ZHANG dong-mei Cotton Research Center Shandong Academy of Agricultural Sciences/Shandong Provincial Key Lab for Cotton Culture and PhysiologyJinan 250100 P.R.China

Two-year field experiments were conducted at Linqing, Yellow River valley of China, to study the plant response to the removal of early fruiting branches in transgenic Bt （Bacillus thuringiensis） cotton （Gossypium hirsutum L.） from 2003 to 2004. Plants were undamaged and treated by removing two basal fruiting branches （FB） at squaring to form the control and the removal treatment, respectively. The plant height, leaf area （LA）, dry weight of fruiting forms （DWFF）, the number of fruiting nodes （NFN）, photosynthetic （Pn） rate, and levels of leaf chlorophyll （Chl）, N, P, K, and Cry lAc protein in main- stem leaves were measured at a 10- or 20-d interval after FB removal, and the sink/source ratio as indicated by NFN/LA and DWFF/LA was determined. FB removal significantly increased the plant height, LA, and plant biomass in both years. Lint yields were increased 7.5 and 5.2% by removal compared with their controls in 2003 and 2004, respectively. Significant increases in boll size （5.7 and 5.1%） were also observed in removal than in control for both years. Either NFN/LA or DWFF/LA was significantly reduced by removal before 40 d after removal; however, both NFN/LA and DWFF/LA were significantly enhanced by FB removal at 80 d after removal compared to the untreated control. There was no significant difference in fiber quality in the first two harvests between removal and control, but fiber strength and micronarie in the third harvest were significantly improved by FB removal. In terms of leaf Chl, Pn rate, levels of total N, P, and K in late season, leaf senescence was considerably delayed by FB removal. Levels of CrylAc protein in the fully expanded young leaves were considerably higher in FB-excised plants than in control, indicating FB removal enhanced CrylAc expression. It is suggested that the yield and quality improvement with FB removal may be attributed to the increased NFN/LA or DWFF/LA in late season and delayed leaf senescence, respectively. FB removal can be a

关键词： branch removal Bt cotton Cry lAc protein leaf senescence photosynthetic rate sink/source ratio

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chitosan-Pectin Synergistic Interaction and Gelation

引用

Wuhan University Journal of Natural Sciences 2001年第4期6卷 826-830页

作者： he dong bao, Shi Yi, Zhan dong feng, Fong Feng College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China Wuhan University College of Chemistry and Molecular Science Wuhan China (GRID:grid.49470.3e) (ISNI:***)

Mixed gels of chitosan-pectin were prepared by varying the ratio of constituents in the presence of NaCl. Mixed gel at 3%of total polysaccharide concentration with addtion of 12%NaCl showed a synergistic maximum when the ratio of chitosan to pectin was 60: 40. The effect of the polysaccharide concentration, the preparation temperature (T p), the time of incubation, balk salt concentration, the molecular weight and the degree of deacetylation of chitosan on gelation have been studied. Interaction mechanism between molecules of both polysaccharides was investigated by FT-IR spectrometry.

关键词： chitosan pectin synergistic interaction gelation

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Study on Inclusions in Large Sapphire Optical Crystal Grown by SAPMAC Method

引用

Chinese Journal of Aeronautics 2006年第B12期19卷 31-35页

作者： WANG Gui-gen ZHANG Ming-fu ZUO Hong-bo he Xiao-dong HAN Jie-cai Center for Composite Structure Harbin Instime of Technology Harbin 150080 China

The sapphire （Al2O3） single crystal is a kind of excellent infrared transmission window materials. A large-sized sapphire （Ф225 mm×205 mm, 27.5 kg） was grown by SAPMAC method （sapphire growth technique with micro-pulling and shoulder-expanding at cooled center）. Several kinds of inclusion in the large sapphire crystal were investigated by means of an optical microscopy （OM）, scanning electron microscopy （SEM） and electron probe microanalysis （EPMA）. The experimental results show that most inclusions are consisted of solid metallic and non-metallic particles as well as gas pores caused by the impurity of alumina as the raw material, the thermal dissociation of aluminum oxide melt and the reaction of the melt to the crucible material （Mo） at high temperatures. It is also found that in different crystal regions the inclusions are of varied sizes, morphology and chemical compositions. Finally, the measures to reduce and eliminate the inclusions are proposed to improve the crystal quality.

关键词： sapphire single crystal inclusions bubbles SAPMAC method

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Survey of High School English Teachers＇ Pragmatic Failure

引用

Sino-US English Teaching 2006年第5期3卷 59-69页

作者： dong he Nanhai Campus of South China Normal University

According to the principals of the Course Standard of English for Ordinary Senior Schools, published by China Education Ministry in 2001, the general goal of English curriculum on the basic education stage is to foster the students＇ cross-cultural awareness, which is to develop their cross-cultural communicative competence. To achieve this goal, most of all, teachers of English at high school must have a good command of cross-cultural pragmatic competence. By looking through papers in various periodicals and the Internet, the writer finds that most of the studies have coped with pragmatic failures of ESL students but few of ESL teachers＇. Therefore, this thesis studies the present situation --- how much do schoolteachers of English know about pragmatics？ What about their cross-cultural communicative competence？ Can they communicate with the native speakers fluently and appropriately？ What are the most serious problems among them in pragmatics？ What can be done to solve the problems？ With all the questions, this research has collected considerable firsthand data and information. Only after the basic situations are known overall, can actions be taken to solve the problems existing in everyday ESL teaching. So this research is necessary and urgent for the present basic English pedagogy. However, since the present writer＇s ability and research conditions are limited, it is not possible to make a wider investigation in many places. Therefore, the district --- Bameng League, Inner Mongolia, China, is selected as the basic range of the survey, the situation of which is believed to be able to represent the basic educational ones in the poor and remote districts in the north and the west of China where education is more backward. The questionnaire consists of two parts： a table of individual information and a test paper. The former investigates informants＇ basic information, including the items of name, age, sex, teaching age, title of the technical post, degree, acade

关键词： High school teachers of English pragmatic failure cross-cultural communicative competence speech acts

来源：

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

Pattern of colorectal surgery and long-term survival:10-year experience from a single center

引用

World Journal of Gastrointestinal Oncology 2024年第11期16卷 4383-4391页

作者： De-Xiang Zhu Miao Chen dong-Hao Xu Guo-dong he Ping-Ping Xu Qi Lin Li Ren Jian-Min Xu Department of Colorectal Surgery Zhongshan Hospital Fudan UniversityShanghai 200032China

BACKGROUND The incidence of colorectal cancer(CRC)has increased in recent decades,and ranks fourth among males and third among females in *** resection remains the most important treatment modality for curative intent in *** studies found that surgeon volumes and specialization appeared to be associated with improved overall survival(OS).Moreover,numerous reports have suggested that specialization and minimally invasive surgery have gained increased popularity in CRC ***,few studies have specifically examined the role and long-term survival of all stage CRC in a real-world *** To evaluate the effect of surgeon specialization on survival changes and minimally invasive surgery utilization in a real world *** A retrospective analysis on the association between surgeon specialization and OS between 2008 and 2013 in Zhongshan Hospital CRC database was *** demographic,clinicopathologic,surgical and follow-up data were obtained from the CRC *** specialty was categorized as colorectal surgeon(CS)and general surgeon(GS).CRC patients who underwent primary surgical resection were *** A total of 5141 CRC patients who underwent primary surgical resection between 2008 and 2013 were evaluated,1748(34.0%)of these by *** percentage of minimally invasive procedures in the CS group showed an increasing *** was no benefit associated with surgeon specialization for stage I,II and IV *** specialization exhibited a significant association with OS solely among stage III patients,with 5-year OS rates of 76%and 67%for the CS and GSgroups,respectively(Pher analyses found that surgeon specialization was significantly associated with survival only in stage III rectal patients,and the 5-year OS rate in the CS group and GS group was 80%and 67%,respectively(P<0.01).CONCLUSION Surgeon specialization is associated with improved OS after primary surgery in stage III rectal patien

关键词： Colorectal surgery Minimally invasive surgery Primary location Overall survival Tumor stage Follow-up

来源：

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

双偶氮苯-二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮衍生物分子的二阶非线性光学性质

引用

原子与分子物理学报 2025年第2期42卷 15-23页

作者：张宇红李博陈自然李渊徐友辉张莉萍何旭东四川职业技术学院能源化工与环境学院遂宁629000

使用密度泛函理论(DFT)M06-2X方法、采用6-311+g(d,p)基组,分别对26个双偶氮-二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮衍生物分子进行结构优化与频率计算;使用含时密度泛函理论(TD-DFT)TD-M06-2X方法计算了a1~d6分子的前线分子轨道与... 详细信息

使用密度泛函理论(DFT)M06-2X方法、采用6-311+g(d,p)基组,分别对26个双偶氮-二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮衍生物分子进行结构优化与频率计算;使用含时密度泛函理论(TD-DFT)TD-M06-2X方法计算了a1~d6分子的前线分子轨道与电子吸收光谱,采用有效场FF方法研究了二阶非线性光学性质(NLO).研究结果表明,26个噻蒽四酮类衍生物分子的能隙在1.33—2.02 eV范围,归属于有机半导体;最低能量吸收峰波长在601.8~609.5nm范围;在增大分子的二阶非线性光学系数β_(μ)(或β_(0))值方面,含相同偶氮苯基团或含不同偶氮苯基团分别引入到二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮分子两侧的2,10位优于2,9位,在2,10位分别端接含推、拉基团的偶氮苯优于含相同给电子基团的偶氮苯.在偶氮苯苯环对位分别端接强吸电子基(-NO_(2))与强供电子基(如-N(CH_(3))_(2)、-N(Ph)_(3)、-N-苯基咔唑等)可增强体系的二阶非线性光学性能,获得性能良好的非线性光学材料.

关键词：双偶氮二苯并[b,i]噻蒽-[2,3-b]苯-5,7,12,14-四酮密度泛函理论电子吸收光谱二阶非线性光学性质

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Contact Finite Determinacy of Relative Map Germs

引用

Communications in Mathematical Research 2010年第1期26卷 1-6页

作者： CheN LIANG SUN WEI-ZHI PEI dong-he Sehool of Mathematics and Statistics Northeast Normal University Changchun 130024 School of Science Changchun University of Science and Technology Changchun 130022

The strong contact finite determinacy of relative map germs is studied by means of classical singularity theory. We first give the definition of a strong relative contact equivalence （or KS,T equivalence） and then prove two theorems which can be used to distinguish the contact finite determinacy of relative map germs, that is, f is finite determined relative to KS,T if and only if there exists a positive integer k, such that M^5（n）ε（S;n）p ∩→ TKs,T（f）.

关键词： KS,T equivalent the tangent space of an orbit relative deformation finite determined relative to KS,T

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

行距配置和种植密度对棉花干物质生产及产量的影响

引用

作物学报 2025年第1期51卷 221-232页

作者：辛明华秘雅迪王国平李小飞李亚兵董合林韩迎春冯璐中国农业科学院棉花研究所/棉花生物学国家重点实验室河南安阳455000 中国农业科学院西部农业研究中心新疆昌吉831100

行距配置和种植密度是影响棉花产量和品质的重要因素。当前新疆棉花种植主要采用宽窄行配置,也有等行距配置方式,但对这两种方式的认识尚存在争议。为此,本研究以中棉所88号为供试材料,采用裂区设计,行距配置(等行距和宽窄行)为主区,种... 详细信息

行距配置和种植密度是影响棉花产量和品质的重要因素。当前新疆棉花种植主要采用宽窄行配置,也有等行距配置方式,但对这两种方式的认识尚存在争议。为此,本研究以中棉所88号为供试材料,采用裂区设计,行距配置(等行距和宽窄行)为主区,种植密度12×104株hm^(–2) (D1)、16×104株hm^(–2) (D2)和18×104株hm^(–2) (D3)为裂区,开展了2年大田试验,比较研究了行距配置和密度对棉花群体生长发育、干物质积累和分配、以及产量和纤维品质的影响。结果表明,中等密度(16×10^(4)株hm^(–2))下等行距和宽窄行处理组合的叶面积指数(LAI)增速、LAI峰值,以及吐絮期生殖器官生物量的分配比例均高于其他处理组合,且二者无显著差异。各处理组合间的棉花群体生长率(CGR)、净同化率(NAR)和棉铃生长率(BGR)均无显著差异。2年平均,中等密度下等行距和宽窄行处理组合的籽棉产量相当,纤维品质指标也无显著差异。表明在中等密度下,无论采用等行距还是宽窄行种植模式,均能达到理想的产量和品质。本研究为新疆棉花行距配置和密度选择提供了科学依据。

关键词：棉花单双行配置密度生长指标干物质积累与分配产量及品质

来源：

维普期刊数据库

同方期刊数据库

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

The dynamics of landscape-scale ecological connectivity based on least-cost model in dongshan Island,China

引用

Journal of Mountain Science 2017年第2期14卷 336-345页

作者： WU Li-yun he dong-jin YOU Wei-bin JI Zhi-rong TAN Yong ZHAO Li-li Forestry College Fujian Agriculture and Forestry UniversityFuzhou 350002China

As a hot topic in Landscape Ecology study,ecological connectivity is an important indicator for regional land sustainable use and biological protection. This paper conducted a systematic assessment of ecological connectivity using remote sensing images of dongshan Island in 1994, 2003 and2011. Based on least-cost modelling, the method takes into consideration the type of barrier, the distance impact, and the adjacent land use types to obtain the Barrier Effect Index(BEI) and Ecological Connectivity Index(ECI). The application of this method to dongshan Island showed the ecological connectivity index(ECI) was low in 1994, improved in 2003, and decreased significantly in 2011. The results of the dynamic analysis of landscape structure showed farmland and roads were the main landscape classes that caused the low observed ECI in 1994 and 2003;these tended to divide the landscape and cause fragmentation. Construction land and roads were the main landscape classes resulting in low ECI in 2011,while forest and grassland had a high ECI. Trajectory analysis showed ECI tended to decrease in the low mountain forest zone of the northwestern and southeastern parts of dongshan Island as well as in the coastal protection forest area. The areas where ECI became high were located in the northeastern part of dongshan Island where cities and towns are concentrated with high human ***, rapid urbanization has been the most important factor driving changes in landscape structure and patterns during the last 17 years on dongshan Island. The approach not only assists us in revealing the driving mechanism of landscape dynamics from another aspect, but also can assess the impacts of regional and urban plans on landscape structure and function.

关键词： Cost-distance model dongshan Island Ecological connectivity Spatio-temporal dynamics

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：