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Synthesis of carbosilane dendrimers with N,N-dimethylaniline as end groups

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Chinese Chemical Letters 2009年第3期20卷 300-301页

作者： Wen Yan sun deng Xu Wang Sheng Yu Feng School of Chemistry and Chemical Engineering Shandong University Ji'nan 250100 China

Carbosilane dendrimers with 4-bromo-N,N-dimethylaniline as end groups were synthesized from methyltfichlorosilane, aUyl chloride, magnesium and 4-bromo-N,N-dimethylaniline. All compounds were characterized by ^1H NMR,... 详细信息

关键词： Dendrimer Synthesis Carbosilane

Theoretical and Experimental Study on Plug Shape Parameter of Press Piercing Mill

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Journal of Iron and Steel Research International 2003年第4期10卷 33-37页

作者： sun deng-yue DU Feng-shan XU Shi-min Yanshan University

The characteristics of some elements in inoculant were analyzed. The effect of the morphology of instantaneous inoculant on its melting velocity was studied. When the inoculants pass through the same sieve number, the volume and the ratio of surface area to volume are different. It is evident from the theoretical analysis and experiment under some conditions that the melting velocity of inoculant depends on the morphology of inoculant. The morphology of inoculant during production should be controlled carefully.

关键词： instantaneous inoculant morphology melting velocity melted iron

锡类散联合复方黄柏液对肛瘘术后创面的临床疗效

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现代生物医学进展 2024年第10期24卷 1937-1940页

作者：张鹏韩林王文飞孙艳军孙登群安徽中医药大学第一临床医学院安徽合肥230038 武警安徽省总队医院普外科安徽合肥230041

目的:观察锡类散联合复方黄柏液对肛瘘术后创面的临床疗效。方法:收集了2019年1月至2022年1月期间接受肛瘘手术治疗的60名患者的临床数据。基于不同的术后治疗方案,将患者分为观察组和对照组,每组30例。比较两组患者在创面疼痛评分、渗... 详细信息

目的:观察锡类散联合复方黄柏液对肛瘘术后创面的临床疗效。方法:收集了2019年1月至2022年1月期间接受肛瘘手术治疗的60名患者的临床数据。基于不同的术后治疗方案,将患者分为观察组和对照组,每组30例。比较两组患者在创面疼痛评分、渗出评分、愈合时间、血清炎症和愈合指标方面的表现。结果:观察组患者在创面疼痛评分、渗出评分、愈合时间、血清炎症和愈合指标方面较对照组具有一定优势,具有统计学意义(P<0.05)。结论:锡类散联合复方黄柏液对于肛瘘术后治疗具有显著地临床疗效,有助于减轻患者的疼痛感和炎症反应,促进手术后创面愈合,并缩短了康复周期。这一发现为改进肛瘘患者的术后治疗提供了有益的临床参考。

关键词：锡类散复方黄柏液肛瘘创面愈合

Effect of surfactant Tween on induction time of gas hydrate formation

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Journal of China University of Mining and Technology 2008年第1期18卷 18-21页

作者： ZHANG Bao-yong WU Qiang sun deng-lin Safety Engineering College Heilongjiang Institute of Science and Technology Harbin Heilongjiang 150027 China CoUege of Resource and Environment Engineering Liaoning Technical University Fuxin Liaoning 123000 China

Acceleration of gas hydrate formation is important in preventing coal and gas outbursts and is based on a hydration mechanism. It becomes therefore necessary to investigate the effect of surfactants, acting as accelerants for hydrate formation, on induction time. We experimented with three types of a Tween solution with equal concentrations of 0.001 mol/L (T40, T40/T80 (1:1), T40/T80 (4:1)). By means of visual experimental equipment, developed by us, we measured generalized induction time using a Direct Observation Method. The experimental data were analyzed combined with a mass transfer model and a hydrate crystal nuclei growth model. Our major conclusions are as follows: 1) solubilization of surfactants produces supersaturated gas molecules, which promotes the mass transfer from a bulk phase to hydrates and provides the driving force for the complexation between host molecules (water) and guest molecules in a gas hydrate formation process; 2) when the solution of the surfactant concentration exceeds the critical micelle concentration (CMC), the surfactant in an aqueous solution will transform to micelles. Most of the gas molecules are bound to form clusters with water molecules, which promotes the formation of crystal nuclei of gas hydrates; 3) the surfactant T40 proved to have more notable effects on the promotion of crystal nuclei formation and on shortening the induction time, compared with T40/T80 (1:1) and T40/T80 (4:1).

关键词： gas hydrate surfactant induction time coal and gas outburst

Synthesis of multifunctional additives for solid propellants:Structure,properties and mechanism

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Defence Technology（防务技术） 2024年第3期33卷 308-316页

作者： Pingan Zhang Lina sun Jianmin Yuan Jianru deng College of Chemistry and Chemical Engineering Hunan UniversityChangsha 410082PR China College of Material Science and Engineering Hunan UniversityChangsha 410082PR China Hu Bei Sanjiang Aerospace Jianghe Chemical Technology Co. LtdYichang 444200PR China

To simplify the composite propellant formulation and address the current issue of the single-functionality present in existing additives,the multi-cyano,amine-based polybutadiene(AEHTPB-CN)was prepared based on AEHTPB by adopting appropriate synthesis *** replacing 10% of HTPB binder in the propellant formulation,it can effectively enhance the interfacial bond strength between the propellant binder matrix and solid fillers(AP(ammonium perchlorate)and RDX(cyclotrimethylene-trinitramine)),the mechanical properties of the HTPB/AP/RDX/Al propellant were superior to blank control propellant with an improvement of 35.4% in tensile strength,62.0% enhancement in elongation at break,and reduce the propellant burn rate by 10.7% with any energy *** function mechanism of AEHTPB-CN was systematically elucidated through experiments and computer simulation *** results show that the tertiary amine group in AEHTPB-CN can react with AP to form ammonium ionic bonds,and the hydroxyl and cyano groups can form hydrogen bonding interactions with AP,which enables AEHTPB-CN to be firmly adsorbed on the AP surface through chemical and physical *** RDX,the interfacial bonding effect of AEHTPB-CN is attributed to their ability to form C-H···N≡C weak hydrogen bonding interaction between the cyano group and RDX methylene group.

关键词： Hydroxyl-terminated polybutadiene(HTPB) HTPB propellant Chemical modification Bonding agent Mechanism

All-inorganic ultrathin high-sensitivity transparent temperature sensor based on a Mn-Co-Ni-O nanofilm

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Microsystems & Nanoengineering 2024年第3期10卷 195-205页

作者： Yuanyuan Cui Mengwei sun Changbo Liu Yuan deng Research Institute for Frontier Science Beihang UniversityBeijing 100191China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Key Laboratory of Intelligent Sensing Materials and Chip Integration Technology of Zhejiang Province Hangzhou Innovation Institute of Beihang UniversityHangzhou 310051China

The demand for optically transparent temperature sensors in intelligent devices is ***,the performance of these sensors,particularly in terms of their sensitivity and resolution,must be further *** study introduces a novel transparent and highly sensitive temperature sensor characterized by its ultrathin,freestanding design based on a Mn-Co-Ni-O *** Mn-Co-Ni-O-based sensor exhibits remarkable sensitivity,with a temperature coefficient of resistance of−4%℃^(−1),and can detect minuscule temperature fluctuations as small as 0.03℃.Additionally,the freestanding sensor can be transferred onto any substrate for versatile application while maintaining robust structural stability and excellent resistance to interference,indicating its suitability for operation in challenging *** practical utility in monitoring the surface temperature of optical devices is demonstrated through vertical integration of the sensor and a micro light-emitting diode on a polyimide ***,an experiment in which the sensor is implanted in rats confirms its favorable biocompatibility,highlighting the promising applications of the sensor in the biomedical domain.

关键词： transparent sensor versatile

不同剂量瑞马唑仑对肝内外胆管结石手术患者麻醉效果及血流动力学影响

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川北医学院学报 2024年第1期39卷 30-33,50页

作者：史劲飞汤洁戴筱筱孙登群武警安徽总队医院麻醉科安徽合肥230001 武警安徽总队医院普外科安徽合肥230001

目的:探讨不同剂量瑞马唑仑对肝内外胆管结石手术患者麻醉效果及血流动力学的影响。方法:选取103例行肝内外胆管结石手术的患者为研究对象,采用瑞马唑仑麻醉,根据麻醉剂量不同分为低剂量组(0.2 mg/kg,n=52)及高剂量组(0.3 mg/kg,n=51)... 详细信息

目的:探讨不同剂量瑞马唑仑对肝内外胆管结石手术患者麻醉效果及血流动力学的影响。方法:选取103例行肝内外胆管结石手术的患者为研究对象,采用瑞马唑仑麻醉,根据麻醉剂量不同分为低剂量组(0.2 mg/kg,n=52)及高剂量组(0.3 mg/kg,n=51)。比较两组患者麻醉效果、镇痛效果、氧化应激程度、血流动力学及不良反应发生情况。结果:低剂量组拔管时间及苏醒时间均短于高剂量组(P0.05)。结论:两种剂量瑞马唑仑麻醉均具有较高的麻醉、镇静及镇痛效果,但高剂量麻醉易导致患者血流动力学波动较大,易引起患者产生较大应激反应,因此对于肝内外胆管结石手术采用低剂量麻醉安全性更佳。

关键词：瑞马唑仑肝内外胆管结石麻醉效果血流动力学

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Design of a Bio-inspired,Two-winged,Flapping-wing Micro Air Vehicle with High-lift Performance

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Journal of Bionic Engineering 2024年第3期21卷 1191-1207页

作者： Kai Hu Huichao deng Shengjie Xiao Gongyu Yang Yuhong sun Space Robot Laboratory The School of Mechanical EngineeringBeihang UniversityBeijing100191China

In this paper,we present the development of our latest flapping-wing micro air vehicle(FW-MAV),named Explobird,which features two wings with a wingspan of 195 mm and weighs a mere 25.2 g,enabling it to accomplish vertical take-off and hover *** devised a novel gear-based mechanism for the flapping system to achieve high lift capability and reliability and conducted extensive testing and analysis on the wings to optimise power matching and lift *** Explobird can deliver a peak lift-to-weight ratio of 1.472 and an endurance time of 259 s during hover flight powered by a single-cell LiPo *** the inherent instability of the prototype,we discuss the derivatives of its longitudinal system,underscoring the importance of feedback control,position of the centre of gravity,and increased *** demonstrate the effect of damping enhancement on stability,we also designed a passive stable ***,the vehicle is actively stabilised in roll by adjusting the wing root bars and in pitch through high-authority tail control,whereas yaw is passively *** a series of flight tests,we successfully demonstrate that our prototype can perform vertical take-off and hover flight under wireless *** promising results position the Explobird as a robust vehicle with high lift capability,paving the way towards the use of FW-MAVs for carrying load equipment in multiple tasks.

关键词： Flapping wing Biologically inspired robots Mechanical design Flight dynamics Damping enhancement

低碱高硅率高抗硫酸盐水泥熟料的研发及生产实践

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水泥技术 2024年第1期 89-92页

作者：曹勤邓荪刘帅明胡国林朱璟江西安福南方水泥有限公司江西安福343200

通过采用资源劣化的自有矿山高硅低钙石灰石原料,进一步优选原燃材料,改进生料配料、加强水泥熟料质量监测和改善煅烧中控操作等措施,研发生产了碱含量约0.2%,硅酸率约3.50的低碱、高硅率、高抗硫酸盐水泥熟料,满足了易受硫酸盐侵蚀、... 详细信息

通过采用资源劣化的自有矿山高硅低钙石灰石原料,进一步优选原燃材料,改进生料配料、加强水泥熟料质量监测和改善煅烧中控操作等措施,研发生产了碱含量约0.2%,硅酸率约3.50的低碱、高硅率、高抗硫酸盐水泥熟料,满足了易受硫酸盐侵蚀、冻融和干湿作用的海港、水利、地下工程建设要求。

关键词：低碱高硅率抗硫酸盐特种水泥