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Combined effect of the use of carbon fiber and seawater and the molecular structure on the tribological behavior of polymer materials

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Friction 2018年第2期6卷 183-194页

作者： Zhiqiang WANG jing ni Dianrong GAO School of Mechanical Engineering Hangzhou Dianzi University State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang University College of Mechanical Engineering Yanshan University

The combined effect of the use of carbon fiber and seawater and the molecular structure on the tribological behavior of various polymer materials under natural seawater lubrication was investigated. After the investigation, the wear morphology of the contact surface was observed by a laser scanning confocal microscope, and the texture of the wear scars and tracks were presented in 3 D profiles. Moreover, the mechanism of mixed lubrication and wear resistance was analyzed. The results demonstrated that the friction coefficient of carbon fiber-reinforced polyetheretherketone(CFRPEEK) is the lowest and fluctuates at approximately 0.11. Moreover, the seven polymer materials in ascending order of friction coefficients are CFRPEEK, carbon fiber-reinforced polyamide-imide, polytetrafluoroethylene, polyoxymethylene, polyetheretherketone(PEEK), acrylonitrile butadiene styrene resin, and glass fiber–epoxy resin. More critically, the simultaneous incorporation of deposition, polymeric scrap, hydrophilic groups, and seawater resulted in a decrease in the friction and wear of polymer materials under seawater lubrication. This observation implies that a synergistic friction-reducing and wear-resistant effect exists between carbon fiber, seawater, and the molecular structure of PEEK. As a result, a highly effective polymer material was discovered, CFRPEEK, which has the lowest friction coefficient of 0.11 and lowest wear rate of 2 × 10^(–5) mm^3?(N?m)^(-1) among the polymer materials; this validates the selection of dual friction pairs for seawater hydraulic components.

关键词： friction coefficient wear molecular structure polymer materials seawater lubrication

Assessment of water-based cutting fluids with green additives in broaching

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Friction 2020年第6期8卷 1051-1062页

作者： jing ni Kai FENG Lihua HE Xiaofan LIU Zhen MENG School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China

In order to improve the cutting performance in broaching,the lubrication and cleaning effects offered by water-based cutting fluids with green additives need to be studied from the viewpoint of green ***,water-based solutions with castor oil,surfactant(linear alkylbenzene sulfonate,LAS),and nanographite were prepared by ultrasonic agitation and sprayed into the zone of broaching via *** performances of the cutting fluids,in terms of the viscosity,specific heat,wetting angle,and droplet size,were evaluated to discuss their effects on the broaching *** the fluids,the addition of LAS into oil-in-water(WO-S),where its cutting fluid with 10 wt.%castor oil and 1.5 wt.%surfactant,exhibited the lowest broaching *** regard to the lubricating and cleaning mechanisms,WO-S has good wettability and permeability,and hence,can lubricate the cutting edge of the tool to decrease the cutting load,cool the cutting edge to keep it sturdy,and clean the surface of the cutting edge to keep it *** results reveal that the simultaneous addition of castor oil and LAS had remarkable effects on the lubrication and cleaning,and resulted in a broaching load reduction of more than 10%compared to commercial cutting ***,the addition of nanographite could not improve the lubrication owing to its agglomeration.

关键词： cutting fluid castor oil linear alkylbenzene sulfonate nanographite broaching

Historic and Future Perspectives of Storm and Cyclone

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Advances in Atmospheric Sciences 2023年第3期40卷 447-463页

作者： Gang FU Pengyuan LI Lijia CHEN Yongmao PENG jing ni Department of Marine Meteorology Ocean-Atmosphere Interaction and Climate LaboratoryKey Laboratory of Physical OceanographyOcean University of ChinaQingdao 266100China Division of Oceanic Dynamics and Climate Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266000China

In weather sciences,the two specific terms“storm”and“cyclone”frequently appear in literature and usually refer to the violent nature of a number of weather systems characterized by central low pressure,strong winds,large precipitation amounts in the form of rain,freezing rain,or snow,as well as thunder and *** what is the connection between these two specific terms?In this paper,the historic evolutions of the terms“storm”and“cyclone”are reviewed from the perspective of weather *** earliest recorded storms in world history are also briefly ***,the origin of the term“meteorological bomb”,which is the nickname of the“explosive cyclone”is ***,the various definitions of explosive cyclones given by several researchers are ***,the climatological features of explosive cyclones,as well as the future trends of explosive cyclones under global climate change,are discussed.

关键词： weather sciences storm and cyclone the origin of explosive cyclone climatological features global climate change future trends

Investigations for vibration and friction torque behaviors of thrust ball bearing with self-driven textured guiding surface

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Friction 2023年第6期11卷 894-910页

作者： Can WU Kai YANG jing ni Shuigen LU Lidan YAO Xinglin LI School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou310018China Hangzhou Bearing Test&Research Center with Assistance of UNDP/UniDO Hangzhou310022China Machinery Industry Bearing Quality Inspection Center(Hangzhou) Hangzhou310022China Sinopec Research Institute of Petroleum Processing Beijing100083China

In order to improve the starved lubrication condition of rolling bearings,three kinds of textures,namely dimple,groove texture,and gradient groove texture,were developed on the guiding surface of thrust ball bearings in this *** results show that gradient groove texture has the one-way self-driving function of liquid *** root mean square(RMS)value of vibration acceleration of gradient groove textured bearing(GGB)decreased by 49.1% and the kurtosis decreased by 24.6% compared with non-textured bearing(NB)due to the directional spreading effect of gradient groove textures on *** frequency domain analysis showed that the textures mainly suppressed the medium and high-frequency energy of bearing vibration,and the GGB was reduced the most with 65.3% and 48%,*** addition,whether the grease is sufficiently sheared has a large impact on the oil guiding effect,and the friction torque of GGB could decrease by 10.5% compared with NB in the sufficiently sheared ***,the gradient groove texture with oil self-driven effect on the guiding surface of rolling bearing can effectively improve the lubrication condition of the bearing and thus reduce the bearing vibration and friction torque,which has a promising application prospect.

关键词： self-driven textures gradient grooved bearing guiding surface bearing vibration friction torque

Development of high-strength magnesium alloys with excellent ignition-proof performance based on the oxidation and ignition mechanisms: A review

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Journal of Magnesium and Alloys 2023年第1期11卷 1-14页

作者： jing ni Li Jin Jian Zeng jing Li Fulin Wang Fenghua Wang Shuai Dong Jie Dong National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

High reactivity and ease of ignition are the major obstacles for the application of Mg alloys in ***,the ignition mechanisms of Mg alloys should be investigated systematically,which can guide the ignition-proof alloy *** article concludes the factors influencing the ignition resistance of Mg alloys from oxide film and substrate microstructure,and also the mechanisms of alloying elements improving the ignition *** low strength is another reason restricting the development of Mg ***,at the last section,Mg alloys with the combination of high strength and good ignition-proof performance are summarized,including Mg-Al-Ca based alloys,SEN(Mg-Al-Zn-Ca-Y)alloys as well as Mg-Y and Mg-Gd based ***,the shortages and the future focus of theses alloys are also *** aim of this article is to promote the understanding of oxidation and ignition mechanisms of Mg alloys and to provide reference for the development of Mg alloys with high strength and excellent ignition-proof performance at the same time.

关键词： High-strength and ignition-proof Mg alloys High temperature oxidation Oxide film Second phases Alloying

Histiocytoid giant cellulitis-like Sweet syndrome at the site of sternal aspiration:A case report and review of literature

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World Journal of Clinical Cases 2022年第27期10卷 9768-9775页

作者： De-Wan Zhao jing ni Xiu-Li Sun Department of Hematology The First Affiliated Hospital of Dalian Medical UniversityDalian 116014Liaoning ProvinceChina Department of Dermatology The First Affiliated Hospital of Dalian Medical UniversityDalian 116011Liaoning ProvinceChina

BACKGROUND Giant cellulitis-like Sweet syndrome(SS) is a rare subtype of SS,and reports of the combined histiocytoid type of pathology are ***,we report a case of SS with distinctive clinical presentations and which was difficult to distinguish from *** sharing this case and a discussion of the related literature in detail,we aim to provide clinicians with new insights into the characteristics of histiocytoid giant cellulitis-like(HGC)-SS and the pathogenesis of *** SUMMARY A 52-year-old male was admitted after experiencing progressive fatigue for 1 mo and tongue swelling with pain for 1 *** was diagnosed with myelodysplastic syndrome(MDS) and angioneurotic edema of the tongue and floor of the ***,7 d after examination by sternal aspiration,a violaceous,tender,and swollen nodule developed at the site,with poorly demarcated erythema of the surrounding *** his profile of risk factors,the diagnosis of cellulitis was made and he was administered broad-spectrum *** the lesion continued to worsen and he developed chills and fever,pathogenic and dermatopathological examination led to the diagnosis of *** with prednisone led to the fever being relieved within 24 h and the skin lesion being resolved within 1 *** patient refused intensive treatment and was instead given thalidomide,erythropoietin,stanozolol,and supportive *** prednisone was gradually tapered,with no signs of recurrence,but he died 2 mo later of severe *** HGC-SS demonstrates unique *** and leukemia cutis share cytological *** and SS are adverse prognostic factors for MDS.

关键词： Sweet syndrome Cellulitis Myelodysplastic syndromes Leukemia cutis Bone marrow aspiration Case report

Auxiliary ligand-directed assembly of a non-interpenetrated cage-within-cage metal-organic framework for highly efficient C_(2)H_(2)/CO_(2) separation

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Chinese Journal of Structural Chemistry 2023年第6期42卷 22-26页

作者： Yong-Peng Li jing-jing ni Shu-Cong Fan Quan-Guo Zhai School of Chemistry and Chemical Engineering Institute of Applied CatalysisYantai UniversityYantaiShandong 264005China Key Laboratory of Macromolecular Science of Shaanxi Province School of Chemistry&Chemical Engineering Shaanxi Normal UniversityXi'an710062China

The development of metal-organic frameworks(MOFs)with highly efficient adsorption and separation of acet-ylene is very important and challenging in chemical industry due to the explosive nature of *** MOFs can be constructed by inserting a second auxiliary ligand,which allows the use of large ligands to construct non-interpenetrated structures and increase pore ***,SNNU-205 is successfully synthesized,which connects two sets of interpenetrated structures to form a double walled cage-within-cage structure by using the introduction of a second auxiliary *** modified pore environment enables SNNU-205 to efficiently selectively adsorb C_(2)H_(2)over CO_(2).At 298 K and 1 atm,SNNU-205 can uptake much more C_(2)H_(2)(76.3 cm^(3)g1)than CO_(2)(47.3 cm^(3)g^(-1)),resulting in a high substance ratio of C_(2)H_(2)-to-CO_(2)(1.6).More importantly,the ideal adsorbed solution theory selectivity calculations and column breakthrough tests further indicate SNNU-205 to be promising adsorbents for C_(2)H_(2)adsorption and purification.

关键词： Metal-organic frameworks(MOFs) Second auxiliary ligand Acetylene storage Acetylene/carbon dioxide separation

A Review of the Latest Control Strategies for Mosquito-Borne Diseases

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China CDC weekly 2024年第33期6卷 852-856页

作者： jing ni Jinna Wang Chunfu Fang Wenrong Zhang Zhenyu Gong School of Public Health Hangzhou Medical CollegeHangzhou CityZhejiang ProvinceChina Department of Communicable Disease Control and Prevention Zhejiang Provincial Center for Disease Control and PreventionHangzhou CityZhejiang ProvinceChina Quzhou Center for Disease Control and Prevention Quzhou CityZhejiang ProvinceChina

Mosquito-borne diseases are persistent and potentially severe posing a threat to global pandemic *** risk of mosquito-borne virus transmission is rapidly increasing due to the unprecedented spread of viruses such as dengue and chikungunya,the disruption of global mosquito-borne disease control efforts following the emergence of coronavirus diseases 2019(COVID-19)in 2019,global warming,and human *** address this global challenge,various innovative mosquito control technologies are being developed *** paper summarizes the latest advances in mosquito vector control,focusing on China’s latest mosquito control strategies,to provide insights into implementing novel mosquito-borne disease control measures.

关键词： diseases warming insight

Bacteria-assisted delivery and oxygen production of nano-enzyme for potent radioimmunotherapy of cancer

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Nano Research 2022年第8期15卷 7355-7365页

作者： jing ni Hailin Zhou jingyu Gu Xinpei Liu Jie Chen Xuan Yi Kai Yang State Key Laboratory of Radiation Medicine and Protection School of Radiation Medicine and Protection&School for Radiological and Interdisciplinary Sciences(RADX)Collaborative Innovation Center of Radiation Medicine of Jiangsu Higher Education InstitutionsSoochow UniversitySuzhou 215123China School of Pharmacy Jiangsu Key Laboratory of Inflammation and Molecular Drug TargetsNantong UniversityNantong 226001China Dushu Lake Hospital Affiliated to Soochow University Medical Center of Soochow UniversitySuzhou 215123China

Tumor-targeting attenuated Salmonella could induce certain antitumor therapeutic effect through its proliferation characteristic and the consequent activated immune response,while host defense cells represented by neutrophils would trap and eliminate these invading bacteria via producing excess hydrogen peroxide(H_(2)O_(2))-including reactive oxygen species in the bacteriainfected tumor,thereby impairing the efficacy of the bacteria treatment of ***,we attempt to combine bacteria treatment and oxygen-dependent radioimmunotherapy of tumor through injection of neutrophil-targeted nano-catalase into the bacteria-treated mice for perfect tumor treatment *** albumin is used to coat catalase and deliver it to the neutrophils infiltrated in bacteria-infected tumor *** advantage of the generating H_(2)O_(2)by neutrophils,easily-diffused oxygen is produced and spread the whole tumor under the catalysis of nano-enzyme,leading to enhanced radiotherapy of hypoxic tumor ***,the optimized tumor microenvironment,synergistically caused by potent immune-stimulation of bacteria,generating oxygen and tumor radiotherapy,would boost the antitumor *** novel combination therapy strategy holds great promise to provide new ideas for future clinical cancer treatment.

关键词： bacteria neutrophil hydrogen peroxide denatured albumin radiotherapy