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Selective inhibition effects on cancer cells and bacteria of Ni–Ti–O nanoporous layers grown on biomedical NiTi alloy by anodization

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Rare Metals 2022年第1期41卷 78-85页

作者： yan-Lian Liu Yong-Hua Sun ya zhao Chun-Lin Li fei-Long zhao Xiao-Hong yao Rui-Qiang Hang Paul K.Chu School of Mechanical Engineering North University of ChinaTaiyuan 030051China Laboratory of Biomaterial Surfaces and Interfaces Institute of New Carbon MaterialsTaiyuan University of TechnologyTaiyuan 030024China Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongHong Kong 999077China

Stents made of nearly equiatomic NiTi alloy are used to treat malignant obstruction caused by cancer,but prevention of re-obstruction after surgery is still a challenge because the bare stents possess poor anticancer and antibacterial properties to inhibit cancer/bacteria *** present work aims at endowing the NiTi alloy with anticancer and antibacterial abilities by surface ***–Ti–O nanoporous layers with different thicknesses were prepared on NiTi by anodization,and biological experiments were conducted to evaluate the effects on gram-positive Staphylococcus aureus,human lung epithelial cancer cells(A549),as well as human endothelial cells(***926).The nanoporous layer with a thickness of 10.1 lm inhibits growth of cancer cells and kill bacteria but shows little adverse effects on normal *** selectivity is related to the larger amount of Ni ions leached from the sample in the acidic microenvironment of cancer cells in comparison with normal *** Ni–Ti–O nanoporous layers are promising as coatings on NiTi stents to prevent re-obstruction after surgery.

关键词： Nickel–titanium alloy Anodization Nanopores Anticancer ability Antibacterial ability

Experimental Investigation on Thermal Characteristics of Long Distance Loop Heat Pipes

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Journal of Thermal Science 2022年第3期31卷 741-750页

作者： zhao ya’nan yaN Tao LIANG Jingtao Key Laboratory of Space Energy Conversion Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing100190China University of Chinese Academy of Sciences Beijing100190China

Loop heat pipes(LHPs)are attractive two-phase thermal control devices for satellites,electronics and many other *** are capable of transporting heat efficiently for long distances up to several meters at any *** paper investigated the heat transfer characteristics of loop heat pipes with long distances and small diameter transport *** stainless steel tubes of 2 mm and 3 mm in inner diameters were chosen as liquid lines and vapor lines of the *** local thermal resistances in the evaporator of the 6 m-LHP were researched and analyzed,which indicated that the thermal resistance between the aluminum block and the vapor in the vapor channel accounted for a major proportion of the total thermal *** effect of heat sink temperatures on the performance of the 6 m-LHP were compared with 10°C,15°C,20°C and 25°C cooling water ***,the thermal characteristics of LHPs with transport distances of 2 m and 16 m were also experimentally *** 16 m-LHP could achieve a heat transfer capacity of 100 W and the 2 m-LHP could reach more than 339 W,on the premise of the evaporator temperature below 100°*** thermal resistance of the 2 m-LHP could achieve 0.125°C/W.

关键词： loop heat pipe thermal management heat transport long distance thermal resistance

Experimental Study on Cooling Down Process of a Nitrogen-Charged Cryogenic Loop Heat Pipe

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Journal of Thermal Science 2023年第1期32卷 153-165页

作者： zhao ya'nan yaN Tao LIANG Jingtao Key Laboratory of Space Energy Conversion Technology Technical Institute of Physics and ChemistryChinese Academyof SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

Cryogenic loop heat pipes are highly efficient heat transfer devices at cryogenic temperature range,which have promising application prospects in satellites,spacecrafts,electronics,and so *** down process is a most critical process for a CLHP before *** present,secondary loop is a major way for a CLHP to fulfil cooling down and most studies are concentrated on heat transfer characteristics during normal ***,few investigations have been carried out on the cooling down *** this paper,the cooling down process of a nitrogen-charged CLHP assisted with a secondary loop was experimentally investigated.A simple qualitative approach to estimate the cooling down time was proposed according to the law of conservation of *** two flow paths of the working fluid in the CLHP during the cooling down process were *** studies on the cooling down process with various secondary heat loads and working fluid inventory were presented in *** the increase of secondary heat load,the elapsed time of Stage III decreased significantly due to the larger mass flow rate in Path *** addition,the effect of the working fluid inventory on the cooling down time was generally small in the range from 2.99 MPa to 3.80 ***,with 2.80 MPa working fluid inventory,it required much longer cooling down time,which was because of the lack of liquid in the CLHP with low working fluid ***,the influence of gravity on the temperature variation of the components during the experiments was *** work is beneficial for better understanding of the cooling down process and optimizing of CLHPs.

关键词： cryogenic loop heat pipe secondary loop cooling down heat transfer

Characteristics of a coherent jet enshrouded in a supersonic fuel gas

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International Journal of Minerals,Metallurgy and Materials 2020年第2期27卷 173-180页

作者： fei zhao Rong Zhu Wen-rui Wang Key Laboratory of Fluid Interaction with Material University of Science and Technology BeijingBeijing 100083China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China School of Mechanical Engineer University of Science and Technology BeijingBeijing 100083China

Based on a current coherent jet,this study proposes a supersonic combustion(SC)coherent jet in which the main oxygen jet is surrounded by a supersonic fuel *** characteristics of the proposed coherent jet are analyzed using experimental methods and numerical simulations in the high-temperature environment of electric arc furnace(EAF)*** SC coherent jet achieved stable combustion in the EAF steelmaking *** simulated combustion temperature of the supersonic shrouding methane gas was 2930 K,slightly below the theoretical combustion temperature of methane–oxygen *** high speed and temperature of the supersonic flame effectively weakened the interaction between the main oxygen jet and the external ambient gas,inhibiting the radial expansion of the main oxygen jet and maintaining its high speed and low turbulence over a long *** features improved the impact capacity of the coherent jet and strengthened the stirring intensity in the EAF bath.

关键词： EAF steelmaking coherent jet supersonic shrouding fuel gas supersonic combustion field characteristics

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几种中草药提取液对沙门氏菌抑菌效果研究

食品科技 2011年第3期36卷 176-179页

作者：杨艾青艾启俊张德权王亚飞赵鹏宇北京农学院食品科学学院北京102206 中国农业科学研究院农产品加工所北京100094

用醇提和水煎两种方法从30种中草药中筛选抑菌作用显著的4种材料为鹿蹄草、山豆根、石榴皮、五倍子。用二倍稀释法测定测定这4种中草药对沙门氏菌的最小抑菌浓度(MIC)和最小杀菌浓度(MBC),然后进一步研究其对温度、介质pH、紫外线照射... 详细信息

用醇提和水煎两种方法从30种中草药中筛选抑菌作用显著的4种材料为鹿蹄草、山豆根、石榴皮、五倍子。用二倍稀释法测定测定这4种中草药对沙门氏菌的最小抑菌浓度(MIC)和最小杀菌浓度(MBC),然后进一步研究其对温度、介质pH、紫外线照射的稳定性。结果表明:鹿蹄草最小抑菌浓度(MIC)为125mg/mL,最小杀菌浓度(MBC)为250mg/mL,五倍子和石榴皮MIC为62.5mg/mL,MBC为125mg/mL,山豆根MIC为250mg/mL,MBC为500mg/mL。温度、介质pH、紫外线照射对这4种中草药提取液稳定性有一定影响。

关键词：中草药提取液最小抑菌浓度(MIC) 最小杀菌浓度(MBC) 稳定性

Wire-like nano-polyaniline deposited electrochemically in a reverse micelle electrolyte as a p H sensor

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International Journal of Minerals,Metallurgy and Materials 2015年第10期22卷 1115-1119页

作者： fei zhao Han-dong Jiao Shi-qiang zhao State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing

Wire-like polyaniline(PANI) films were successfully electrodeposited onto an indium tin oxide(ITO) substrate using a pulse galvanostatic method(PGM) in a reverse micelle electrolyte. The as-prepared PANI films were electrochemically analyzed by cyclic voltammetry and electrochemical impedance spectroscopy in 1 mol·L-1 HCl O4 solution. It is found that the as-prepared PANI films are highly porous, exhibit the diameters of approximately 100 nm and the lengths exceeding 3 μm, and have favorable electrochemical activities. Furthermore, the as-prepared wire-like PANI films show a good linear relationship of the potentiometric response curve over the p H value range of 3–10 with a slope of 74.13 m V·p H-1 in 0.5 mol·L-1 K2HPO4 basal solutions. The results demonstrate that the prepared wire-like PANI films are promising p H sensors.

关键词： electrodeposition polymers sensors thin films

Evaluation of silymarin extract from Silybum marianum in mice: anti-fatigue activity

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Food Science and Human Wellness 2022年第4期11卷 914-921页

作者： Luming Jia fei zhao College of Food Science and Engineering Dalian Ocean UniversityDalian 116023China

Silymarin has been used for centuries for its hepatoprotective properties. The specific objective of this study was to evaluate the anti-fatigue properties of silymarin. The silymarin was administered orally at doses of 50, 100, and 200 mg/kg for 4 weeks;the fatigue level and exercise performance were evaluated using exhaustive swimming time and pole-climbing time, as well as levels of plasma lactate, ammonia, glucose, creatine kinase(CK), serum urea nitrogen(SUN), blood lactic acid(BLA), muscle glycogen(MG), and liver glycogen(LG) contents after an intensive swimming session. The results demonstrated that silymarin treatment decreased the BLA and SUN levels while increased the LG and MG levels. In addition, silymarin decreased plasma lactate and ammonia levels and CK activity after swimming test, this is related to the mechanism that increases energy storage(as glycogen) and release(as blood glucose), and decreases plasma levels of lactate, ammonia, and CK. The observation of the skeletal muscle structures of mice also confirmed that skeletal muscles became more damaged in the control group compared with the silymarin-treated mice after prolonged endurance exercise. Therefore, it is reasonable to infer that silymarin may bear potential pharmacological effects in combating fatigue.

关键词： Silybum marianum Silymarin Anti-fatigue Exhaustion exercise

Prediction of mechanical properties of cold rolled strip based on improved extreme random tree

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Journal of Iron and Steel Research International 2023年第2期30卷 293-304页

作者： Yun-bao zhao Yong Song fei-fei Li Xian-le yan Institute of Engineering Technology University of Science and Technology BeijingBeijing100083China

Taking the 2130 cold rolling production line of a steel mill as the research object,feature dimensionality reduction and decoupling processing were realized by fusing random forest and factor analysis,which reduced the generation of weak decision trees while ensured its *** base learner used a weighted voting mechanism to replace the traditional average method,which improved the prediction ***,the analysis method of the correlation between steel grades was proposed to solve the problem of unstable prediction accuracy of multiple steel *** experimental results show that the improved prediction model of mechanical properties has high accuracy:the prediction accuracy of yield strength and tensile strength within the error of±20 MPa reaches 93.20%and 97.62%,respectively,and that of the elongation rate under the error of±5%has reached 96.60%.

关键词： Cold strip rolling Mechanical property prediction Extreme random tree Factor analysis Random forest Correlation analysis Steel grade

Generalized high-order twisted partially coherent beams and their propagation characteristics

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Frontiers of physics 2022年第5期17卷 167-174页

作者： Hai-Yun Wang zhao-Hui yang Kun Liu ya-Hong Chen Lin Liu fei Wang yang-Jian Cai School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal UniversityJinan 250014China

Twist phase is a nontrivial statistical phase that only exists in partially coherent fields,which makes the beam carry orbital angular momentum(OAM).In this paper,we introduce a new kind of partially coherent beams carrying high-order twist phase,named generalized high-order twisted partially coherent beams(GHTPCBs).The propagation dynamics such as the spectral density and OAM flux density propagating in free space are investigated numerically with the help of mode superposition and fast Fourier transform(FFT)*** results show that the GHTPCBs are capable of self-focusing,and the beam spot during propagation exhibits teardrop-like or the diamond-like shape in some certain ***,the influences of the twist order and the twist factor on the OAM flux density during propagation are also illustrated in ***,we experimentally synthesize the GHTPCBs with controllable twist phase by means of pseudo-mode superposition and measure their spectral density during *** experimental results agree well with the theoretical *** studies may find applications in nonlinear optics and particle trapping.

关键词： light manipulation statistical optics twist phase coherence structure orbital angular momentum