检索结果-内蒙古大学图书馆

Rational Design of a Negative Photochromic Spiropyran-Contained Fluorescent Polymeric Nanoprobe for Sulfur Dioxide Ratiometric Detection and in Vivo Imaging

SSRN

引用

SSRN 2022年

作者： Chen, Jian Li, Xiang Lin, Zhong Tian, Yong Zhang, Chonghua Zhang, Peisheng Zeng, Rongjin Qiao, Lei Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion Hunan Province College Key Laboratory of QSAR/QSPR School of Chemistry and Chemical Engineering Hunan University of Science and Technology Hunan Xiangtan411201 China Central Laboratory of the Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University Xuzhou first People's Hospital Jiangsu Xuzhou221116 China Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science MOE Shandong Key Laboratory of Biochemical Analysis College of Chemistry and Molecular Engineering Qingdao University of Science and Technology China

It is highly desirable to develop high-performance of ratiometric fluorescent probes for SO2 detection and realize their application in biological imaging and food detection. In this study, we reported the rational design of a novel negative photochromic spiropyran derivative as Spiro[azahomoadamantane-pyran] (MAHD-SP) with notable orange fluorescence in its stable ring-opened state without UV regulation. The unsaturated double bond of MAHD-SP can undergo Michael addition reaction of SO2 , which makes the obviously fluorescence quenching of MAHD-SP. Then, MAHD-SP, a fluorescent conjugated polymer PFO and a polymeric surfactant PEO113 - b -PS49 were used to construct a ratiometric fluorescent polymeric nanoprobe ( RFPN ) via co-precipitation method. The probe exhibited high sensitivity and selectivity toward ratiometric detection of SO2 in pure aqueous solutions. Moreover, RFPN was applied to quantitative analysis of SO2 in food and water samples. The good biocompatibility of RFPN can also be used to visualization of exogenous and endogenous SO2 generation in zebrafish model. © 2022, The Authors. All rights reserved.

关键词： Addition reactions

来源：评论

学校读者我要写书评

暂无评论

Development and application of a Flexible Indication Device for Grounding Wire Status

Development and Application of a Flexible Indication Device ...

引用

Power and Electrical technology Conference (APET), Asia

作者： Yang Qi Chen Chunxue Jiang Lin Jia Zijian Zhang Bo Pan Zhuohong Hunan Province Key Laboratory of Intelligent Live Working Technology and Equipment (Robot) Changsha China Live Inspection and Intelligent Operation Technology State Grid Corporation Laboratory Changsha China State Grid Hunan Extra High Voltage Transmission Company State Grid Hunan Electric Power Co. LTD Hengyang China Hebei Provincial Key Laboratory of Power Transmission Equipment Security Defense North China Electric Power University Baoding China

In the process of electrical equipment maintenance, it is especially important to eliminate personal injury accidents caused by false hanging of grounding devices and induction and backwards power feed caused by poor grounding in field operations. The paper proposes a design of a quick indicator device for grounding wire conducting status based on fast magnetic field detection. The conducting status detection unit uses a miniature three-dimensional magnetic field to realize real-time high-speed magnetic field monitoring, the conducting status alarm unit realizes local acoustic and optical alarms through three thresholds, and the wireless signal sending unit realizes cloud display of conducting status information. The paper provides this monitoring device for current measurement on grounding conductors.

关键词： Wireless communication Three-dimensional displays Grounding Current measurement Wires Real-time systems Magnetic fields

来源：评论

学校读者我要写书评

暂无评论

Evaluation of the Acute Toxicity of Prochloraz-manganese Chloride Complex to Environmental Species

引用

Agricultural Biotechnology 2021年第1期10卷 74-78页

作者： Xuye ZHANG Ji MA Xuanqing KONG Kuai YU Xiaojun DENG Wensen OUYANG Yu JIANG Xiaoming OU Chenzhong JIN Collaborative Innovation Center for Farmland Weeds Control Techniques and Application of Hunan Province/Key Laboratory of Pesticide Harmless Application Hunan University of HumanitiesScience and TechnologyLoudi 417000China National Agrochemical Creation Engineering Research Center/Hunan Provincial Key Laboratory of Agrochemicals Hunan Research Institute of Chemical IndustryChangsha 410014China WEIPU Testing Technology Co. Ltd.Changsha 410014China

[Objectives] This study was conducted to evaluate the toxicity risk of prochloraz-manganese chloride complex to environmental organisms. [Methods] The acute toxicity tests of prochloraz-manganese chloride complex on 8 common environmental organisms, such as Coturnix coturnix japonica, Apis mellifera L., Eisenia foetida, Bombyx mori, Trichogramma japonicum, Brachydanio rerio, Daphnia magna Straus and Scenedesmus obliquus were carried out. [Results] Prochloraz-manganese chloride complex to D. magna EC50(48 h): 1.11 mg a.i./L, with a 95% confidence limit of 1.00-1.26 mg a.i./L;B. rerio LC50(96 h): 2.84 mg a.i./L, with a 95 % Confidence limit of 2.43-3.48 mg a.i./L;S. obliquus ErC50(72 h): 1.88×10^-2 mg a.i./L, with a 95% confidence limit of 1.70×10^-2-2.16×10^-2 mg a.i./L;C. coturnix LD50(168 h): 1.01×10^3 mg a.i./kg body weight, with a 95% confidence limit of 7.87×10^2-1.27×10^3 mg a.i./kg body weight;T. japonicum LR50(24 h): 2.53×10^-3 mg a.i./cm^2, with a 95% confidence limit of 2.14×10^-3-2.99×10^-3 mg a.i./cm^2;B. mori LC50(96 h): 2.03×10^2 mg a.i./L, with a 95% confidence limit of 1.79×10^2-2.30×10^2 mg a.i./L;A. mellifera(peroral) LD50(48 h)>100 μg a.i./bee;A. mellifera(contact) LD50(48 h)>100 μg a.i./bee;E. foetida LC50(14 d)>1.00×10^2 mg a.i./kg dry soil. According to the Guidance for Evaluating and Calculating Degradation Kinetics in Environmental Media for Pesticide Registration, prochloraz-manganese chloride complex had low toxicity to A. mellifera, C. coturnix, B. mori and E. foetida, medium toxicity to D. magna and B. rerio, and high toxicity and low risk to S. obliquus and T. japonicum. [Conclusions] This study provides a data basis for the toxicity and environmental safety evaluation of the agent.

关键词： Prochloraz-manganese chloride complex Environmental organisms Acute toxicity

来源：评论

学校读者我要写书评

暂无评论

Strain engineering on electrochemical performance sensing of uric acid based on two-dimensional Co 3 O 4 nanosheets

引用

Sensors and Actuators B: Chemical 2025年 442卷

作者： He Liu Feng Lin Xuejun Zheng Hui Dong School of Mechanical Engineering and Mechanics Engineering Research Center of Complex Tracks Processing Technology and Equipment of MoE Xiangtan University Xiangtan 411105 China Key Laboratory of Welding Robot and Application Technology of Hunan Province Xiangtan University Xiangtan 411105 China

Two-dimensional (2D) nanostructured semiconductors with abundant active sites and specific surface area are promising non-precious metal catalysts for flexible electrochemical biosensors. Here, we reported the cost-effective and high-performance strain electrocatalytic uric acid (UA) sensors based on 2D Co 3 O 4 nanosheets prepared by a simple hydrothermal method. The corresponding electrocatalytic efficiencies for UA were modulated by tensile and compressive strains. Moreover, density functional theory (DFT) calculations were performed to reveal the corresponding mechanisms from the atomic scale. The prepared UA strain sensor exhibits a wide detection concentration with a linear range from 6 μM to 5 mM and a low detection limit of ∼6 μM. The induced compressive strain of −1.5 % in the 2D Co 3 O 4 nanosheet significantly increases the sensitivity by 58.4 % and decreases the charge transfer impedance by 29.7 % of UA, while the tensile strain of + 1.5 % decreases the sensitivity by 52.4 % and increases the charge transfer impedance by 44.7 % of UA compared to those under zero strain. From DFT calculation, the corresponding compressive strain of −1.5 % decreases the spin-up band gap by 23.9 % and the spin-down band gap by 24.6 % and the tensile strain of + 1.5 % leads to the increase of 30.2 % in the spin-up band gap and 48.4 % in the spin-down band gap as to those of intrinsic zero strain. The decrease in bandgap leads to an increase in the electron transport rate, thus increasing the sensor sensitivity. Our research provides guidance on the design of low-cost and mass-producible 2D materials integrated into wearable high-performance electrocatalytic sensors.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Varisized Positively-Charged Nanodiamond Cluster Vectors for Sirna Delivery and Transfection

SSRN

引用

SSRN 2022年

作者： Zhu, Huamin Chen, Dongsheng Yao, Yunfei Xu, Xiangyang Fu, Xianghui School of Minerals Processing and Bioengineering Central South University Changsha410083 China Key Laboratory for Mineral Materials and Application of Hunan Province Changsha410083 China School of Mechanical and Automotive Engineering Guangxi University of Science and Technology Liuzhou545006 China

When used as drug or gene carrier, the regulation of particle size and dispersibility are essential. Adopting high-energy ball milling, diamond nanoparticle (ND) aggregates of detonation origin were ground before dispersed and classified into a variety of ND clusters with different granule size. The morphology and surface properties of as-prepared ND clusters were characterized. ND clusters show good shelf stability in size and surface potential, among which ND60, a cluster portion with the mean size of ~60 nm, exhibits the best dispersion stability and the highest absolute zeta potential over a broad pH range. Besides, ND clusters can be used safely as they have limited cytotoxicity to HaCaT cells. Driven by the electrostatic attraction, ND-siRNA conjugates can be prepared and the siRNA-loading/releasing capacities of ND clusters were evaluated. It can be concluded that, the smaller the clusters, the higher loading capacity they possess. ND60 can adsorb as high as 215.08 μg/mg siRNA thereon, while the releasing rate reaches 67%, 3 times that of ND300. Confocal laser scanning microscopy analysis verified that ND60 can effectively deliver and transfect siRNA into HEK293 cells. © 2022, The Authors. All rights reserved.

关键词： Nanodiamonds

来源：评论

学校读者我要写书评

暂无评论

Dual rejuvenation mechanism of aged SBS modified asphalt using colza oil and dodecenyl succinic anhydride rejuvenators

引用

Construction and Building Materials 2025年 482卷

作者： Liang, Chenghao Li, Qishi Sun, Changjun Zhang, Henglong Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province Hunan University Hunan Changsha410082 China Hunan Provincial Engineering Research Center for construction solid wastes recycling Hunan Changsha410205 China

To respond to the concept of green and sustainable development, and to enhance the utilization of aged SBS modified asphalt (SBSMA) in road construction, a novel SBSMA rejuvenator based on colza bio-oil (CO) and dodecenyl succinic anhydride (DDSA) was developed in this study. The rejuvenation effects of CO and DDSA on SBSMA used individually and in combination were analyzed and evaluated. The findings indicate that CO exhibits a superior rejuvenation impact on the physical properties of asphalt compared to DDSA, although its effectiveness in improving high-temperature properties is limited. The physical properties of the CO/DDSA rejuvenated SBSMA are closest to those of the original SBSMA. Compared with the original SBSMA, the penetration and softening points of the CO/DDSA rejuvenated SBSMA increased by 2.08 % and 11.41 %, respectively, while its ductility decreased by 11.97 %. The incorporation of DDSA allowed the rejuvenated asphalt to recover the phase angle plateau region. Within the temperature range of 30–90 ℃, the complex shear modulus index and phase angle index of the CO/DDSA rejuvenated SBSMA are both around 1, indicating consistency between the temperature curves of its G* and δ and those of the original SBSMA. CO exhibits a strong ability to replenish light components of aged asphalt, while DDSA can chemically react with SBS segments to form ester bonds, thereby repairing the degraded SBS network. The combined application of the two rejuvenators provides a dual rejuvenation mechanism that not only disperses asphaltene aggregates formed during ageing but also reconstructs the network structure of SBSMA. © 2025 Elsevier Ltd

关键词： Bio-oil Dual rejuvenation Microscopic properties Network structure Rejuvenated SBS modified asphalt

来源：评论

学校读者我要写书评

暂无评论

Occurrence and Control of Weeds in Abandoned Fields in Central hunan

引用

Agricultural Biotechnology 2021年第2期10卷 31-33,36页

作者： Yunyun ZHOU Shunli XIAO Chenzhong JIN Xiu LIU Jun PAN Kuojie XIAO Qiuyuan DUAN Key Laboratory of Pesticide Harmless Application of Hunan Higher Education Hunan University of HumanitiesScience and TechnologyLoudi 417000China Collaborative Innovation Center for Farmland Weeds Control Techniques and Application of Human Province Loudi 417000China Applied Characteristic Discipline of Plant Protection Hunan University of HumanitiesScience and TechnologyLoudi 417000China

[Objectives]This study was conducted to clarify the occurrence of weeds,and give relevant comprehensive control suggestions accordingly.[Methods]The species and community characteristics of weeds in abandoned rice fields in central hunan were investigated and analyzed.[Results]There were 75 species of weeds in the abandoned farmland in central hunan,belonging to 66 genera,27 *** them,22 species had a relative abundance of more than 5%.According to the different water environments of abandoned fields,there were differences in the types and structures of *** succeeded to wetland vegetation types and dryland vegetation types *** grown in the original farmland still exist in abandoned fields,but they were mainly invaded by field weeds,such as Digitaria sanguinalis,Eleusine indica,Panicum acroanthum,Bidens pilosa,and Xanthium sibiricum.[Conclusions]This study lays a foundation for fully guaranteeing the actual results of re-cultivation of abandoned land in rural areas.

关键词： Central hunan Abandoned fields Weeds Integrated control

来源：评论

学校读者我要写书评

暂无评论

A Comparative Study of Bare and Swssc Wrapped Bfrp Bars Exposed to laboratory and Real Marine Environments

SSRN

引用

SSRN 2022年

作者： Feng, Guangyan Zhu, Deju Guo, Shuaicheng Rahman, Md Zillur Ma, Wenbo Yi, Yong Zuquan, Jin Shi, Caijun Key Laboratory for Green & Advanced Civil Engineering Materials and Application Technology of Hunan Province College of Civil Engineering Hunan University Changsha410082 China International Science Innovation Collaboration Base for Green & Advanced Civil Engineering Materials of Hunan Province Hunan University Changsha410082 China Key Laboratory of Building Safety and Energy Efficiency of the Ministry of Education Hunan University Changsha410082 China Department of Mechanical Engineering Ahsanullah University of Science and Technology Dhaka1208 Bangladesh College of Civil Engineering and Mechanics Xiangtan University Xiangtan411105 China Engineering Research Center of Concrete Technology in Marine Environment Ministry of Education Qingdao University of Technology Qingdao266033 China

The high alkalinity of concrete restricts the application of BFRP bars as reinforcement in seawater and sea sand concrete (SWSSC), but lowering the alkalinity enhances the durability of BFRP bars. This work focuses on the degradation of BFRP bars embedded in SWSSC in the laboratory and real marine environments . The interlaminar shear strength (ILSS) and microcosmic deterioration of BFRP bars wrapped in ordinary and low-alkalinity SWSSCs were investigated using ILSS test, 1H NMR, FTIR, TG, and SEM. It was found that the BFRP bars in the natural marine environment suffer from less degradation than those in the accelerated laboratory environment due to the lower temperature.. After 180 days of exposure to 55°C seawater and the field environment, the ILSS retentions of BFRP tendons in ordinary SWSSC are 54% and 85%, while those in low-alkalinity SWSSC remain 81% and 97%, respectively. The decreased alkalinity and porosity in low-alkalinity SWSSC also considerably minimize the hydrolysis of epoxy resin in BFRP tendons caused by alkaline and moisture erosion. Furthermore, the Arrhenius theory-based model predicts that using low-alkalinity SWSSC may extend the service life of BFRP bars by roughly 2.5 times. This study provides insights into using low-alkalinity SWSSC to improve the durability of FRP bars in marine concrete structures. © 2022, The Authors. All rights reserved.

关键词： Deterioration

来源：评论

学校读者我要写书评

暂无评论

A Recommendation Method for Highly Sparse Dataset Based on Teaching Recommendation Factorization Machines

引用

Computers, Materials & Continua 2020年第9期64卷 1959-1975页

作者： Dunhong Yao Shijun Li Ang Li Yu Chen School of Computer Science and Engineering Huaihua UniversityHuaihua418000China Key Laboratory of Wuling-Mountain Health Big Data Intelligent Processing and Application in Hunan Province Universities Huaihua418000China Key Laboratory of Intelligent Control Technology for Wuling-Mountain Ecological Agriculture in Hunan Province Huaihua418000China School of Computer Wuhan UniversityWuhan430072China Department of Electrical and Computer Engineering Duke UniversityDurhamNC 27708USA School of Computer Science and Engineering Yulin Normal UniversityYulin537000China

There is no reasonable scientific basis for selecting the excellent teachers of the school’s *** solve the practical problem,we firstly give a series of normalization models for defining the key attributes of teachers’professional foundation,course difficulty coefficient,and comprehensive evaluation of ***,we define a partial weight function to calculate the key attributes,and obtain the partial recommendation ***,we construct a highly sparse Teaching Recommendation Factorization Machines(TRFMs)model,which takes the 5-tuples relation including teacher,course,teachers’professional foundation,course difficulty,teaching evaluation as the feature vector,and take partial recommendation value as the recommendation ***,we design a novel Top-N excellent teacher recommendation algorithm based on TRFMs by course classification on the highly sparse *** results show that the proposed TRFMs and recommendation algorithm can accurately realize the recommendation of excellent teachers on a highly sparse historical teaching *** recommendation accuracy is superior to that of the three-dimensional tensor decomposition model algorithm which also solves sparse *** proposed method can be used as a new recommendation method applied to the teaching arrangements in all kinds of schools,which can effectively improve the teaching quality.

关键词： Highly sparse dataset normalized models teaching recommendation factorization machines excellent teacher recommendation

来源：评论

学校读者我要写书评

暂无评论

Evaluating the Mechanical Properties and Durability of Alkali-Activated Slag Mortar Mixed with Waste Glass

SSRN

引用

SSRN 2022年

作者： Gong, Jianqing Dong, Yazhu Zhang, Hao Li, Jiusu College of Civil Engineering Hunan University Changsha410082 China Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province Changsha410082 China Hunan Huda Civil Engineering and Architecture Engineering Inspection Co. Ltd. Changsha410082 China School of Traffic and Transportation Engineering Changsha University of Science and Technology Changsha410000 China

To explore the feasibility of using waste glass as a green building material, this study prepared an alkali-activated slag (AAS) mortar using glass powder with partial slag (i.e., 0, 10%, 20%, and 30% by mass fraction), and thereafter, replaced some of the fine aggregates (i.e., 0, 10%, 20%, and 30% by mass fraction) with glass sand in the AAS mortar mixed with 10% glass powder. In the study, the compressive strength, flexural strength, drying shrinkage, and alkali-silicate reaction (ASR) of the AAS mortar were tested whilst the microscopic mechanism was analyzed using the scanning electron microscope (SEM). From the study findings, it was observed that adding glass powder to the AAS mortar effectively increased its early compressive and flexural strengths. Whilst the drying shrinkage also increased, the ASR expansion potential decreased. Overall, the results indicated that after blending with 10% glass powder, adding glass sand generally enhanced the AAS mortar's mechanical properties and reduced the ASR expansion rate, but it also undesirably caused more drying shrinkage. By contrast, SEM imaging analysis revealed that the addition of 30% glass powder to the AAS mortar produced more microcracking. Thus, whilst the surface of the glass sand generated some hydration products and yielded a tighter bond with the cementitious material that inherently improved the microstructure density of the AAS mortar, the microcracks in glass sand may likely lead to strength reduction. For optimizing the mechanical properties and durability of the AAS mortar whilst concurrently minimizing the ASR expansion rate and drying shrinkage, the study findings suggested 10% and 30% as the optimum dosages for the glass powder and glass sand, respectively. © 2022, The Authors. All rights reserved.

关键词： Compressive strength

来源：评论

学校读者我要写书评

暂无评论

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

请选择保存的检索档案：

请选择收藏分类：

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

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

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：