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Cellulose Nanocrystals-mediated Phase Morphology of PLLA/TPU Blends for 3D Printing

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Chinese Journal of Polymer Science 2022年第3期40卷 299-309,I0008页

作者： Xiao Wu Yun-Xiao Liu hai-peng Wu Hao Wu hai-Jun Wang Yong-Xin Duan Jian-Ming Zhang Key Laboratory of Rubber-Plastics Ministry of Education/Shandong Provincial Key Laboratory of Rubber-plasticsQingdao University of Science&TechnologyQingdao 266042China Shaanxi University of Science and Technology Xi’an 710021China

Incorporation of nanoparticles into polymer blend to obtain finely dispersed morphology has been considered as an effective strategy to prepare nanocomposites. Owing to the renewable and degradable characters, cellulose nanocrystals(CNCs) have been proposed to tailor the phase morphology of poly(L-lactic acid)(PLLA) blend for producing high-performance fused deposition modeling(FDM) consumables. However,the main challenge associated with the ternary systems is the dispersion of the highly hydrophilic CNCs in non-polar PLLA blend by industrial melt blending without involving solution. Herein, with poly(vinyl acetate)(PVAc) modified CNCs powder(a mixture of PVAc grafted from CNCs and PVAc homopolymer latex), the selective dispersion of CNCs in PLLA has been achieved by simple melt processing of PLLA/TPU(polyether polyurethane)/CNCs blend. This results in the ultra-fine TPU droplets at nanoscale in PLLA and improves the melt processibility of composites in FDM due to the decreased viscosity ratio of the dispersed/matrix and the enhanced melt elasticity of PLLA. Combined with the intensive shear and continuous stretch effect during FDM, aligned TPU nanofibers(TNFs) were in situ formed along the elongational flow direction during deposition, which in turn contributed to the improvement of PLLA/TPU/CNCs with 5 wt% filler loading in tensile ductility by 418%, inter-layer adhesion strength and notched impact toughness by 261% and 210%, respectively, as well as achieved good dimensional accuracy and very fine surface quality.

关键词： Poly(L-lactic acid)blend Cellulose nanocrystals Phase morphology tailoring 3D printing Rheo-viscoelastic properties

某1000MW超超临界机组不同配汽方式对经济性的影响研究

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汽轮机技术 2024年第5期66卷 389-392,397页

作者：夏芃葛宇孙嘉张进杨洪亮余海鹏杨文正蒋国安国家能源集团泰州发电有限公司泰州225327 哈尔滨汽轮机厂有限责任公司哈尔滨150046 中电神头发电有限责任公司朔州036800 国能南京电力试验研究有限公司南京210023

基于某1000MW超超临界机组,分别对喷嘴调节、全周进汽+节流调节、全周进汽+补汽阀调节等配汽方式进行了变工况计算分析,结果表明不同配汽方式对机组变工况性能影响主要体现在主汽压力和高压缸效率变化上,进而影响机组热耗率。针对该机... 详细信息

基于某1000MW超超临界机组,分别对喷嘴调节、全周进汽+节流调节、全周进汽+补汽阀调节等配汽方式进行了变工况计算分析,结果表明不同配汽方式对机组变工况性能影响主要体现在主汽压力和高压缸效率变化上,进而影响机组热耗率。针对该机组全年负荷率分布情况进行了综合经济性分析,得出了该机组经济性最优的配汽方式。

关键词： 1000MW超超临界汽轮机配汽方式经济性

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中海油陵水气田首台高压收球筒分析设计

石油化工设备 2024年第2期53卷 59-65页

作者：陈林袁豆少刚贾磊刘维康梁海亮王海鹏谢腾腾陈建华中海石油(中国)有限公司海南分公司海南海口570100 上海蓝滨石化设备有限责任公司上海201518 中海油能源发展装备技术有限公司加工制造分中心广东湛江524057 中海油能源发展装备技术有限公司湛江分公司广东湛江524000

在石油运输管道建设与维护中,清管作业十分关键。收球筒是管道清管作业中必不可少的设备,其壳体接管开孔区域是承压薄弱部位,最易发生破坏。采用ANSYS17.0有限元分析软件,根据收球筒的主要设计条件和结构参数,按照JB 4732—1995 《钢制... 详细信息

在石油运输管道建设与维护中,清管作业十分关键。收球筒是管道清管作业中必不可少的设备,其壳体接管开孔区域是承压薄弱部位,最易发生破坏。采用ANSYS17.0有限元分析软件,根据收球筒的主要设计条件和结构参数,按照JB 4732—1995 《钢制压力容器——分析设计标准(2005年确认)》的规定,对中海油陵水气田首台高压收球筒壳体多个开孔区域的主要受压元件进行应力分析与强度评定。结果表明,分析设计的高压收球筒满足应力强度评定要求,符合工程项目验收条件。

关键词：收球筒超深水气田高压应力有限元分析强度评定

Experimental research on semi-coke for blast furnace injection

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Journal of Iron and Steel Research International 2021年第4期28卷 391-401页

作者： Chun-chao Huang Xiao-jun Ning Guang-wei Wang Jian-liang Zhang Zheng-fu peng hai-peng Teng State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Guanzhuang Campus University of Science and Technology BeijingBeijing 100083China

The combustion properties and grindability of Shenmu low-rank coal(SM)and its four different semi-cokes were studied by the self-designed equipment and Hardgrove *** four semi-cokes were obtained under the pyrolysis temperature of 400,500,600 and 700℃,named as SM-400,SM-500,SM-600 and SM-700,*** analyses of nitrogen adsorp-tion,Fourier-transform infrared spectroscopy(FTIR)spectra and Raman spectra were carried out to explain the change in combustion ratio and *** result showed that the specific surface area of samples had an essential effect on the combustion ratio of SM-400 and ***,the grindability depended on the strength of coal matrix,and the augment of pore amounts would increase the *** functional groups and graphitization degree of the same sam-ple were identical with the combustion *** the pyrolysis upgrading temperature increasing,the combustion ratio of sample decreased,corresponding to the decrease in the benzene ring and the increase in graphitization *** addition,the thermogravimetric analysis was carried out,and the result was compared against what was shown in the data of com-bustion *** pulverized coal injection,the combustion ratio was more intuitive and more accurate than combustibility.

关键词： Semi-coke Combustion ratio Functional group Graphitization degree Grindability

冻融优质单囊胚移植失败后重复周期胚胎移植策略的探讨

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生殖医学杂志 2024年第9期33卷 1147-1152页

作者：李苏萍刘海鹏彭姝明杨帆段丽湖南省郴州市第一人民医院生殖医学中心郴州423000

目的探讨冻融优质单囊胚移植失败后重复周期的胚胎移植策略。方法回顾性分析2018年7月至2022年10月在我中心进行冻融优质单囊胚移植后重复周期治疗患者的临床资料,共887个周期。根据患者年龄不同分为0.05);单优囊组的临床妊娠率显著低... 详细信息

目的探讨冻融优质单囊胚移植失败后重复周期的胚胎移植策略。方法回顾性分析2018年7月至2022年10月在我中心进行冻融优质单囊胚移植后重复周期治疗患者的临床资料,共887个周期。根据患者年龄不同分为0.05);单优囊组的临床妊娠率显著低于其他4组(60.41%vs.77.08%、72.73%、69.74%、70.83%,P0.05);各亚组间的临床妊娠率、活产率、流产率比较均无显著性差异(P>0.05),但单优囊组的多胎妊娠率显著低于其他4组(0.00%vs.33.33%、29.17%、20.59%、15.00%,P<0.05)。结论对于接受冻融优质单囊胚移植后行重复周期治疗的不孕患者,冻融胚胎移植策略的选择需要综合权衡。年龄≥35岁的患者,5种胚胎移植策略获得的临床结局相近,可以根据患者实际情况进行选择;而年龄<35岁的患者,在没有条件进行冻融优质单囊胚移植时,也可以考虑冻融优质双卵裂胚移植策略,但其后续多胎妊娠率风险较高,仍需要关注。

关键词：冻融胚胎移植单囊胚移植重复周期胚胎移植策略

Deriving Energy-Gap of Some Nonlinear Hamiltonians by Invariant Eigen-operator Method

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Communications in Theoretical Physics 2008年第9期50卷 674-676页

作者： FAN Hong-Yi TANG Xu-Bing HU hai-peng Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026 China Department of Physics Shanghai Jiao Tong University Shanghai 200030 China

By virtue of the invariant eigen-operator method we search for the invariant eigen-operators for someHamiltonians describing nonlinear processes in particle *** this way the energy-gap of the Hamiltonians can benatura... 详细信息

关键词： invariant eigen-operator method nonlinear multiphoton Hamiltonian energy gap characteristic polynomial

钴掺杂叶片状沸石咪唑酯骨架结构材料实现磷酸盐快速去除

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中国环境科学 2024年第9期44卷 4929-4938页

作者：孙太焱彭海豪童婧向银萍徐峥勇杨朝晖熊炜平湖南大学环境科学与工程学院湖南长沙410082 湖南现代环境科技股份有限公司湖南长沙410004

为了减小水体富营养化的危害,提高吸附法除磷的效率,本文研究钴掺杂对于锌基叶片状沸石咪唑盐(Zn-ZIF-L)磷酸盐吸附能力的提升.本文采用间歇式吸附试验研究各个影响因素对于吸附的影响,采用XRD、XPS、FT-IR等研究材料的表面微观结构以... 详细信息

为了减小水体富营养化的危害,提高吸附法除磷的效率,本文研究钴掺杂对于锌基叶片状沸石咪唑盐(Zn-ZIF-L)磷酸盐吸附能力的提升.本文采用间歇式吸附试验研究各个影响因素对于吸附的影响,采用XRD、XPS、FT-IR等研究材料的表面微观结构以推测可能的吸附机理.发现当Zn和Co的初始摩尔比为9.5:0.5时,其吸附性能最好.掺杂后,在10min内吸附量增加55%,最大吸附量达到85.68mg/g,在不同温度、浓度、当pH值为4~8时、在不同阴离子以及腐殖酸环境下保持着较好的吸附性能.当初始浓度为10mg/L时,可吸附去除97%以上的磷,吸附剂在0.1mol/L的Cl^(-)或NO_(3)^(-)中仍能保持93%以上的吸附量.其中,P-OH与Zn-OH/Co-OH之间的化学键、静电相互作用和氢键相互作用在磷酸盐吸附中起主导作用.Co(0.5)-Zn-ZIF-L经过4次循环后仍能保持较高的吸附量.结果表明,Co(0.5)-Zn-ZIF-L能作为一种有效的吸附剂去除水体中的磷酸盐.

关键词：除磷钴掺杂叶片状沸石咪唑酯骨架结构材料

支链氨基酸在运动改善胰岛素抵抗中的作用研究进展

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生命科学 2024年第4期36卷 537-553页

作者：曹维魏昊郜瑞睿孙海鹏邱俊强北京体育大学运动人体科学学院运动生物化学教研室北京100084 运动营养北京市高等学校工程研究中心北京100084 天津医科大学朱宪彝纪念医院&内分泌研究所天津市代谢性疾病重点实验室国家卫生健康委员会激素与发育重点实验室天津300134 天津医科大学医学表观遗传学省部共建协同创新中心心血管病中心天津300134

作为必需氨基酸,支链氨基酸(branched chain amino acids, BCAAs)是一种被广泛应用的运动营养补剂。然而越来越多的证据表明,BCAAs与胰岛素抵抗(insulin resistance, IR)之间密切相关,BCAAs分解代谢能力受损是高水平BCAAs的主要原因。... 详细信息

作为必需氨基酸,支链氨基酸(branched chain amino acids, BCAAs)是一种被广泛应用的运动营养补剂。然而越来越多的证据表明,BCAAs与胰岛素抵抗(insulin resistance, IR)之间密切相关,BCAAs分解代谢能力受损是高水平BCAAs的主要原因。运动是有效预防和缓解IR的非药物手段,急性运动和长期运动可能通过不同的调节因子来增强BCAAs分解代谢以减轻BCAAs堆积,促进BCAAs稳态的恢复。本文将针对运动对BCAAs的作用和可能机制以及运动通过BCAAs改善IR的研究现状进行综述,旨在为IR人群制定运动营养干预策略提供新思路。

关键词：运动支链氨基酸胰岛素抵抗

Preparation and properties of hot-deformed magnets processed from nanocrystalline/amorphous Nd-Fe-B powders

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Rare Metals 2021年第8期40卷 2033-2039页

作者： peng Zhao Yang Luo Dun-Bo Yu hai-Jun peng Wen-Long Yan Zi-Long Wang Xin-Yuan Bai National Engineering Research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsBeijing100088China Grirem Advanced Materials Co. LtdBeijing100088China

The hot-deformed magnets processed from nanocrystalline/amorphous Nd-Fe-B powders were preparedunderdifferenthot-pressingtemperatures(600-750℃,at intervals of 25℃)by the self-made hotpressing *** microstructure and magnetic properties of hot-deformed magnets prepared at different temperatures were also *** the temperature is above 650℃,the density of magnet reaches 7.5 g·cm^(-3).The optimum magnetic properties of magnetic induction intensity of B_(r)=1.3 T,optimum energy product of(BH)_(max)=282.5 kJ·m^(-3),intrinsiccoercivityof H_(cj)=1130.0 kA·m-1 of hot-deformed magnets are obtained at hot-pressing temperature of 650℃.X-ray diffractometer pattern shows that the(00 L)texture has been *** the microstructural characteristic,on the one hand,the good magnetic performance is attributed to the fine platelet-like grains with an average length of 410-440 nm at the hot-pressing temperature range from625 to 675℃.On the other hand,the unaligned coarse grains are observed in all the *** the areal fraction of those is gradually increasing with the rise of the hot-pressing temperature,which tends to deteriorate the magnetic *** composition map shows the accumulation of Nd/Pr-rich phase in the coarse grains’region.

关键词： Nanocrystalline/amorphous powders Hotpressing temperature Hot-deformed Magnets Magnetic properties Microstructure