检索结果-南通市图书馆

Study on the green extraction of corncob xylan by deep eutectic solvent

Grain & Oil Science and Technology 2024年第1期7卷 50-59页

作者： Bingyu Jiao Le Wang haitao Gui Zifu Ni Rong du Yuansen Hu School of Biological Engineering National Engineering Research Center of Wheat and Corn Further ProcessingZhengzhou 450001China

Corn as one of the world's major food crops,its by-product corn cob is also rich in ***,the unreasonable utilization of corn cob often causes the environmental pollution,waste of resources and other *** one of the most abundant polymers in nature,xylan is widely used in food,medicine,materials and other *** cob is rich in xylan,which is an ideal raw material for extracting ***,the intractable lignin is covalently linked to xylan,which increases the difficulty of xylan *** has been reported that the deep eutectic solvent(DES)could preferentially dissolve lignin in biomass,thereby dissolving the ***,the xylan in the extract was separated by ethanol precipitation *** xylan precipitate was obtained after centrifugation,while the supernatant was *** components of the supernatant after ethanol precipitation were separated by the rotary *** ethanol,water and DES were collected for the subsequent extraction of corn cob *** this study,a novel way was provided for the green production of corn cob *** DES was used to extract xylan from corn cob which was used as the raw *** effects of solid-liquid ratio,reaction time,reaction temperature and water content of DES on the extraction rate of corn cob xylan were investigated by the single factor ***,the orthogonal test was designed to optimize the xylan extraction *** structure of corn cob xylan was analyzed and *** results showed that the optimum extraction conditions of corn cob xylan were as follows:the ratio of corn cob to DES was 1:15(g:mL),the extraction time was 3 h,the extraction temperature was 60℃,and the water content of DES was 70%.Under these conditions,the extraction rate of xylan was 16.46%.The extracted corn cob xylan was distinctive triple helix of polysaccharide,which was similar to the structure of commercially available *** was effectively and workably extracted from corn

关键词： Corncob Deep eutectic solvent Xylan Process optimization Extraction

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

B-incorporated,N-doped hierarchically porous carbon nanosheets as anodes for boosted potassium storage capability

引用

Chinese Chemical Letters 2022年第1期33卷 480-485页

作者： Yu Hu Cheng Tang haitao Li Aijun du Wei Luo Minghong Wu Haijiao Zhang Institute of Nanochemistry and Nanobiology Shanghai UniversityShanghai 200444China School of Chemistry Physics and Mechanical EngineeringScience and Engineering FacultyQueensland University of TechnologyBrisbane QLD 4001Australia School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China

Carbonaceous nanomaterials with porous structure have become the highly promising anode materials for potassium-ion batteries(PIBs)due to their abundant resources,low-cost,and excellent ***,the sluggish reaction kinetics and inferior cycling life caused by the large radius of K ions severely restrict their commercial ***,B,N co-doped hierarchically porous carbon nanosheets(BNPC)are achieved via a facile template-assisted route,followed by a simple one-step carbonization *** resultant BNPC possesses a unique porous structure,large surface area,and high-level B,N *** structural features endows it with remarkable potassium storage performances,which delivers a high reversible capacity(242.2 mA h/g at100 m A/g after 100 cycles),and long cycling stability(123.1 m Ah/g at 2000 m A/g and 62.9 m Ah/g at5000 mA/g after 2000 cycles,respectively).Theoretical simulations further validate that the rich B doping into N-modified carbon configuration can greatly boost the potassium storage capability of the BNPC anode.

关键词： Carbon nanosheets Hierarchical nanostructure B N co-doping Anode materials Potassium-ion batteries

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

松嫩平原几个柳树杂交品系抗寒性试验

引用

防护林科技 2024年第4期 63-65页

作者：杜海涛张强李勇毕宇邢政华季晓慧王静黑龙江省林业科学院齐齐哈尔分院黑龙江齐齐哈尔161005 克山县北联林场黑龙江齐齐哈尔161633

为探讨几个柳树杂交品系的抗寒性,对近年在试验林内生长性状表现较好的6个灌木柳新品系(4#、8#、15#、16#、18#、25#)进行低温冷冻和冻后生长恢复试验,检验杂交品种的抗寒性。以不同时间为主处理,以5 d为时间间隔,设置4个时间梯度,以不... 详细信息

为探讨几个柳树杂交品系的抗寒性,对近年在试验林内生长性状表现较好的6个灌木柳新品系(4#、8#、15#、16#、18#、25#)进行低温冷冻和冻后生长恢复试验,检验杂交品种的抗寒性。以不同时间为主处理,以5 d为时间间隔,设置4个时间梯度,以不同品系(品种)为副处理,以杞柳为对照开展柳树杂交品系抗寒性试验。结果表明:抗寒能力依次为18#>4#>杞柳>16#>25#>8#>15#,18#表现突出,抗寒性较强。当受到长时间低温影响时,25#、8#和15#电解质渗出率高于50%,出现了不同程度的冻害,当冷冻时间15~20 d时,试验中所有参试品系(品种)的电解质渗透率都在50%以上,会影响柳树生长发育,但还未达到死亡时间。

关键词：柳树新品系抗寒性时间梯度

来源：

维普期刊数据库

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

Interfacial properties and micellization of triblock poly(ethylene glycol)-poly(ε-caprolactone)-polyethyleneimine copolymers

引用

Acta Pharmaceutica Sinica B 2020年第6期10卷 1122-1133页

作者： Ji Li Yitian du haitao Su Shixuan Cheng Yanxia Zhou Yiguang Jin Xian-Rong Qi Key Laboratory of Molecular Pharmaceutics and New Drug Delivery System School of Pharmaceutical SciencesPeking UniversityBeijing 100191China Department of Pharmaceutical Sciences Beijing Institute of Radiation MedicineBeijing 100850China

This study aimed to explore the link between block copolymers’interfacial properties and nanoscale carrier formation and found out the influence of length ratio on these characters to optimize drug delivery system.A library of diblock copolymers of PEG-PCL and triblock copolymers with additional PEI(PEG-PCL-PEI)were ***,a systematic isothermal investigation was performed to explore molecular arrangements of copolymers at air/water ***,structural properties and drug encapsulation in self-assembly were investigated with DLS,SLS and *** found the additional hydrogen bond in the PEG-PCL-PEI contributes to film stability upon the hydrophobic interaction compared with ***-PCL-PEI assemble into smaller micelle-like(such as PEGPCL4006-PEI)or particle-like structure(such as PEG-PCL8636-PEI)determined by their hydrophilic and hydrophobic block *** distinct structural architectures of copolymer are consistent between interface and *** the disparity of constituent ratio,we discovered the arrangement of both chains guarantees balanced hydrophilic-hydrophobic ratio in self-assembly to form stable ***,the structural differences were found to have significant influence on model drugs incorporation including docetaxel and *** together,these findings indicate the correlation between molecular arrangement and self-assembly and inspire us to tune block compositions to achieve desired nanostructure and drug loading.

关键词： Block copolymers Langmuir films Molecular arrangement Self-assembly Nanostructure

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

揭/盖保温被时间对日光温室气温的影响

引用

贵州农业科学 2019年第8期47卷 112-118页

作者：杜海涛石茗化张艳艳乐章燕周鹏李敬海廊坊市气象局

为廊坊市及类似地区日光温室油桃和毛桃揭、盖保温被时间提供借鉴参考,利用河北省廊坊市2017年1-4月2个不同日光温室的连续观测数据,研究不同揭、盖保温被时间对日光温室气温的影响。结果表明:多云、阴天和晴天3种天气条件下不同揭、盖... 详细信息

为廊坊市及类似地区日光温室油桃和毛桃揭、盖保温被时间提供借鉴参考,利用河北省廊坊市2017年1-4月2个不同日光温室的连续观测数据,研究不同揭、盖保温被时间对日光温室气温的影响。结果表明:多云、阴天和晴天3种天气条件下不同揭、盖保温被时间的总体变化趋势一致;随着时间的推后,揭保温被的时间越来越早,盖保温被时间则越来越晚;连阴天第2天后应推迟揭保温被时间,提早盖保温被时间,第3天后揭保温被时间应推迟至10∶00后;揭保温被时间过早,1月晴天和多云天白天不能满足温室桃对温度的需求,2月晴天和多云天基本能满足温室桃对温度的要求,但阴天应推迟揭保温被的时间并提早覆盖保温被。

关键词：日光温室揭保温被时间盖保温被时间温室气温

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

Power-law patterns in the Phanerozoic sedimentary records of carbon, oxygen, sulfur,and strontium isotopes

引用

Journal of Palaeogeography 2024年第1期13卷 116-126页

作者： haitao Shang Institute of Ecology and Evolution University of OregonEugeneOR97403USA

Power-law patterns appear in a variety of natural systems on the modern Earth;nevertheless,whether such behaviors appeared in the deep-time environment has rarely been studied. Isotopic records in sedimentary rocks, which are widely used to reconstruct the geological/geochemical conditions in paleoenvironments and the evolutionary trajectories of biogeochemical cycles, offer an opportunity to investigate power laws in ancient geological systems. In this study, I focus on the Phanerozoic sedimentary records of carbon, oxygen, sulfur, and strontium isotopes, which have well documented and extraordinarily comprehensive datasets. I perform statistical analyses on these datasets and show that the variations in the sedimentary records of the four isotopes exhibit power-law behaviors. The exponents of these power laws range between 2.2 and 2.9;this narrow interval indicates that the variations in carbon, oxygen, sulfur, and strontium isotopes likely belong to the same universality class, suggesting that these systematic power-law patterns are governed by universal, scale-free mechanisms. I then derive a general form for these power laws from a minimalistic model based on basic physical principles and geosystem-specific assumptions, which provides an interpretation for the power-law patterns from the perspective of thermodynamics. The fundamental mechanisms regulating such patterns might have been ubiquitous in paleoenvironments, implying that similar power-law behaviors may exist in the sedimentary records of other isotopes.

关键词： Power laws Phanerozoic sedimentary records Carbon isotope(δ~(13)C) Oxygen isotope(δ~(18)O) Sulfur isotope(δ~(34)S) Strontium isotope(~(87)Sr/~(86)Sr)

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

基于燃料电池客车智能综合热管理控制系统集成与研究

引用

汽车实用技术 2025年第1期50卷 7-12页

作者：汪海涛北京福田欧辉新能源汽车有限公司

为解决燃料电池客车单一电热式采暖系统高能耗的问题，并减少热能流失，文章基于氢燃料客车燃料电池发动机传统分布式热量控制策略，提出一种整车一体化智能综合热管理控制策略。将燃料电池发动机工作时产生的热量进行回收利用，并通过... 详细信息

为解决燃料电池客车单一电热式采暖系统高能耗的问题，并减少热能流失，文章基于氢燃料客车燃料电池发动机传统分布式热量控制策略，提出一种整车一体化智能综合热管理控制策略。将燃料电池发动机工作时产生的热量进行回收利用，并通过板翅式热交换器将热能充分转化并应用于客舱内采暖和前风挡除霜除雾，实现高集成度和精细化的热量管理。该技术可降低单一的电热式采暖系统的能耗，提升整车采暖舒适性体验，使整车经济性能大幅提升。

关键词：氢能燃料电池一体化热管理降低能耗

来源：

维普期刊数据库博看期刊

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

Lagrangian view of time irreversibility of fluid turbulence

引用

Science China(Physics,Mechanics & Astronomy) 2016年第1期59卷 7-15页

作者： haitao Xu Center for Combustion Energy and Department of Thermal Engineering Tsinghua UniversityBeijing 100084China Max Planck Institute for Dynamics&Self-Organization(MPIDS) Gottingen D-37077Germany Ecole Normale Superieure de Lyon Lyon F-69007France Institute for Nonlinear Dynamics University of Gottingen GSttingen D-37077Germany Laboratory of Atomic and Solid State Physics and Sibley School of Mechanical and Aerospace Engineering Cornell UniversityIthaca NY 14853USA

A turbulent flow is maintained by an external supply of kinetic gradients. The scale at which energy is supplied greatly differs energy, which is eventually dissipated into heat at steep velocity from the scale at which energy is dissipated, the more so as the turbulent intensity （the Reynolds number） is larger. The resulting energy flux over the range of scales, intermediate between energy injection and dissipation, acts as a source of time irreversibility. As it is now possible to follow accurately fluid particles in a turbulent flow field, both from laboratory experiments and from numerical simulations, a natural question arises： how do we detect time irreversibility from these Lagrangian data？ Here we discuss recent results concerning this problem. For Lagrangian statistics involving more than one fluid particle, the distance between fluid particles introduces an intrinsic length scale into the problem. The evolution of quantities dependent on the relative motion between these fluid particles, including the kinetic energy in the relative motion, or the configuration of an initially isotropic structure can be related to the equal-time correlation functions of the velocity field, and is therefore sensitive to the energy flux through scales, hence to the irreversibility of the flow. In contrast, for single- particle Lagrangian statistics, the most often studied velocity structure functions cannot distinguish the ＂arrow of time＂. Recent observations from experimental and numerical simulation data, however, show that the change of kinetic energy following the particle motion, is sensitive to time-reversal. We end the survey with a brief discussion of the implication of this line of work.

关键词： fluid turbulence time irreversibility energy cascade Lagrangian description

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

鹿茸治疗精神及神经性疾病疗效及机制研究进展

引用

辽宁中医药大学学报 2024年第11期26卷 157-161页

作者：王仪吕征邵学坤杜海涛董丽敏王琳王平山东省中医药研究院山东济南250014 山东中医药大学山东济南250355

鹿茸因具有抗氧化、抗炎、抗骨损伤、抗神经疾病和免疫调节等各种生物学特性而受到了广泛的关注,在精神及神经性疾病治疗中发挥重要作用,包括对如轻度认知障碍、缺血性脑病、阿尔茨海默病、帕金森病、抑郁症及神经损伤等相关疾病的预防... 详细信息

鹿茸因具有抗氧化、抗炎、抗骨损伤、抗神经疾病和免疫调节等各种生物学特性而受到了广泛的关注,在精神及神经性疾病治疗中发挥重要作用,包括对如轻度认知障碍、缺血性脑病、阿尔茨海默病、帕金森病、抑郁症及神经损伤等相关疾病的预防和治疗。该文综述了鹿茸及鹿茸多肽治疗精神及神经性疾病的研究进展,重点介绍了其干预作用及调控机制。研究发现鹿茸及其成分可以有效改善轻度认知障碍、抑制神经损伤、减轻缺血性脑病、缓解阿尔茨海默病、改善帕金森病,并显著减少抑郁样行为和保护神经元,其调控机制可能涉及抗炎、抗氧化、细胞焦亡、Rho/ROCK通路、Akt/mTOR信号、Nrf-2/HO-1/NF-κB通路等多种途径。该文的整理分析为拓宽鹿茸的应用和发掘神经系统疾病的治疗方法提供理论依据和新思路,并揭示一种潜在的治疗药物。

关键词：鹿茸鹿茸多肽神经性疾病精神性疾病机制

来源：

维普期刊数据库

同方期刊数据库

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

Urbanization under globalization:How does the Belt and Road Initiative affect urbanization levels in participating countries

引用

Journal of Geographical Sciences 2022年第11期32卷 2170-2188页

作者： MA haitao Key Laboratory of Regional Sustainable Development Modeling Institute of Geographic Sciences and Natural Resources ResearchCASBeijing 100101China

China’s Belt and Road Initiative(BRI)presents the world with a new era of inclusive globalization,which will shape urbanization patterns *** study considered the launch of BRI as a quasi-experiment,where we evaluated the BRI’s impact on urbanization by way of difference-in-differences(DID)and propensity score matching(PSM)*** results showed that the BRI exerted a significantly negative effect on urbanization in its first three *** positive effect emerged from the fifth year onwards,indicating that the BRI’s positive effect on urbanization required a period of practical *** analysis and placebo test were also conducted to verify the robustness of the *** effects in low-income countries were revealed to have been much greater than in high-income countries,meaning the BRI had been conducive to promote local urban growth in underdeveloped ***,the geographical detector model was introduced to discuss the influencing mechanism of urbanization in BRI and non-BRI countries,showing external factors were the prominent driving forces in BRI countries,whereas internal drivers played an important role in non-BRI *** findings indicated that the implementation of the BRI contributed to building global economic growth and supporting a shared future.

关键词： Belt and Road Initiative urbanization globalization difference-in-differences propensity score matching

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：