检索结果-南通市图书馆

Rare Metals 2024年第11期 6088-6095页

作者： Jun-Yi Gong dan-dan yang Wei Liu Jie Hou School of Resource Environment and Safety Engineering University of South China CAS Key Laboratory of Materials for Energy Conversion and Collaborative Innovation Center of Suzhou Nano Science and Technology University of Science and Technology of China

The absence of cathode materials with excellent activity and stability has hampered the widespread application of proton-conducting solid oxide fuel cells （H-SOFCs）.Sm2Ba1.33Ce0.67Cu3O9（SBCC） is a layered material formed by the cross-stacking of a [CuO5layer][CeO2-like layer][CuO5layer][SmxBa1-xCuOyperovskite layer].This complex structure could potentially enhance electrocatalytic performance owing to the integration of differentstructural,chemical and electronic properties.

关键词：

Attitude maneuver of liquid-filled spacecraft with a flexible appendage by momentum wheel

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2012年第2期28卷 543-550页

作者： dan-dan yang Bao-Zeng Yue Wen-Jun Wu Xiao-Juan Song Le-Mei Zhu Department of Mechanics School of Aerospace EngineeringBeijing Institute of Technology100081 BeijingChina

Attitude maneuver of liquid-filled spacecraft with an appendage as a cantilever beam by momentum wheel is studied. The dynamic equations are derived by conserva- tion of angular momentum and force equilibrium principle. A feedback control strategy of the momentum wheel is ap- plied for the attitude maneuver. The residual nutation of the spacecraft in maneuver process changes with some chosen parameters, such as steady state time, locations of the liq- uid container and the appendage, and appendage parame- ters. The results indicate that locations in the second and fourth quadrants of the body-fixed coordinate system and the second quadrant of the wall of the main body are better choices *** the liquid containers and the appendage than other locations if they can be placed randomly. Higher density and thicker cross section are better for lowering the residual nutation if they can be changed. Light appendage can be modeled as a rigid body, which results in a larger residual nutation than a flexible model though. The resid- ual nutation decreases with increasing absolute value of the initial sloshing angular height.

关键词： Liquid-filled spacecraft Appendage Attitude maneuver Momentum wheel Steady state time Residual nutation

Numerical analyses of ventilated cavitation over a 2-D NACA0015 hydrofoil using two turbulence modeling methods

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2018年第2期30卷 345-356页

作者： dan-dan yang An Yu Bin Ji Jia-jian Zhou Xian-wu Luo State Key Laboratory of Hydroscience and Engineering Tsinghua University Beijing 100084 China Beijing Key Laboratory of CO2 Utilization and Reduction Technology Department of Energy and Power Engineering Tsinghua University Beijing 100084 China School of Power and Mechanical Engineering Wuhan University Wuhan 430072 China Marine Design and Research Institute of China Shanghai 200011 China

The present paper studies the ventilated cavitation over a NACA0015 hydrofoil by numerical methods. The corresponding cavity evolutions are obtained at three ventilation rates by using the level set method. To depict the complicated turbulent flow structure, the filter-based density corrected model（FBDCM） and the modified partially-averaged Navier-Stokes（MPANS） model are applied in the present numerical analyses. It is indicated that the predicted results of the cavitation shedding dynamics by both turbulence models agree fairly well with the experimental data. It is also noted that the shedding frequency and the super cavity length predicted by the MPANS method are closer to the experiment data as compared to that predicted by the FBDCM model. The simulation results show that in the ventilated cavitation, the vapor cavity and the air cavity have the same shedding frequency. As the ventilated rate increases, the vapor cavity is depressed rapidly. The cavitation-vortex interaction in the ventilated cavitation is studied based on the vorticity transport equation（VTE） and the Lagrangian coherent structure（LCS）. Those results demonstrate that the vortex dilatation and baroclinic torque terms are highly dependent on the evolution of the cavitation. In addition, from the LCSs and the tracer particles in the flow field, one may see the process from the attached cavity to the cloud cavity.

关键词： Ventilated cavitation level set method filter-based density corrected model (FBDCM) modified partially-averaged Navier-Stokes (MPANS) model Lagrangian coherent structure (LCS)

Giant low-grade appendiceal mucinous neoplasm: A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第13期7卷 1726-1731页

作者： Jian-Ming yang Wei-Hao Zhang dan-dan yang Hao Jiang Lei Yu Feng Gao Department of Colorectal Cancer Surgery Second Affiliated Hospital of Harbin Medical University

BACKGROUND Appendiceal mucinous neoplasm (AMN) is extremely rare. Since the disease does not manifest a characteristic profile of clinical symptoms, it is easy to misdiagnose and still difficult to diagnose without operation. Here, we report a case of low-grade AMN (LAMN) and summarize its clinical features, diagnosis, and treatment. CASE SUMMARY A 63-year-old postmenopausal woman presented with a history of right lower abdominal mass. The patient underwent laparotomy, which showed an appendiceal mucocele originating from the apex of the appendix, and a simple appendectomy was performed. The subsequent histological assessment identified an LAMN with no lymph node involvement and negative surgical margin. The patient received six cycles of chemotherapy after surgery, and to date, more than a year after the surgery, the patient remains in good health. CONCLUSION A unified, standardized, detailed, and accurate pathological diagnosis is needed for LAMN, to facilitate selection of an appropriate surgical plan. In addition, the surgeon should record the details of the tumors in the surgical records in order to facilitate follow-up after surgery.

关键词： Mucocele of appendix Appendiceal mucinous neoplasm Low-grade appendiceal mucinous neoplasm Pathological profile Diagnosis Case report

Changes in Schlemm’s canal,trabecular meshwork,and relevant parameters in the early stage after SMILE of myopia patients

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2022年第2期15卷 291-298页

作者： dan-dan yang Zhi-Qi Chen Wei Chen He Yin Jing-Kai Peng Jun-Ming Wang Department of Refractive Surgery Wuhan Eye Good Ophthalmic HospitalWuhan 430014Hubei ProvinceChina Department of Ophthalmology Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030Hubei ProvinceChina

AIM:To observe the changes in Schlemm’s canal(SC),trabecular meshwork(TM),and anterior chamber relevant parameters after small incision lenticule extraction(SMILE) of myopia ***:A total of 58 eyes from 30 patients who underwent SMILE were divided into a low and moderate myopia group(group A,32 eyes) and a high myopia group(group B,26 eyes).The diameter and area of the SC,the width and thickness of TM obtained by CIRRUS HD-OCT5000,and the related anterior chamber parameters obtained by Pentacam anterior segment analysis system,accommodation amplitude(AMP) were observed pre-and *** preoperative intraocular pressure(IOP) and postoperative correction of intraocular pressure(IOPcc) were ***:The diameter and area of the SC in the two groups were significantly increased postoperatively(all P0.05).The corneal curvature,central anterior chamber depth,and anterior chamber volume decreased after SMILE surgery(all P<0.01).There was a weak negative correlation between the SC area change and AMP change in group A(r=-0.362,P<0.01).The postoperative IOP decreased after correction by Shah formula(P<0.05).CONCLUSION:SC and TM in myopia patients change in the early postoperative stage of SMILE and the IOP is decline.

关键词： Schlemm’s canal trabecular meshwork intraocular pressure myopia small incision lenticule extraction

Multi-functional Hollow Structures for Intelligent Drug Delivery

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2024年第3期40卷 394-412页

作者： HOU Ping yang Nailiang WANG dan State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing 100049P.R.China

Multi-fountional hollow structures have emerged as promising platforms for intelligent drug delivery due to their unique properties,such as high loading capacities and programmed drug *** particular,hollow multishell structures(HoMSs)with multilevel shell and space can regulate the molecular-level interaction between drugs and materials,so as to achieve the temporal-spatial order and sequential release of *** anisotropic hollow structures can control the drug diffusion process by inducing the macroscopic interface flow through autonomous movement,realizing the targeted drug transport and *** this paper,a key focus will be HoMSs with their temporal-ordered architectures and anisotropic hollow carriers with directional *** synthesis mechanisms,structure-property relationships,smartly programmed drug delivery and biomedical applications will be discussed,providing insights into designing next-generation intelligent drug carriers.

关键词： Hollow multishell structure Anisotropic hollow structure Intelligent drug carrier Temporal-spatial order Directional movement

Association of atherosclerotic plaque features with collateral circulation status in elderly patients with chronic carotid stenosis

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2020年第4期17卷 202-209页

作者： Hui-Min XU Ran HUO Rui-Jing XIN dan-dan yang Ying LIU Ning LANG Xi-Hai ZHAO Tao WANG Hui-Shu YUAN Department of Radiology Peking University Third HospitalBeijingChina Department of Radiology Zhongda HospitalMedical School of Southeast UniversityNanjingChina Beijing Institute of Brain Disorders Laboratory of Brain DisordersMinistry of Science and TechnologyCollaborative Innovation Center for Brain DisordersCapital Medical UniversityBeijingChina Center for Biomedical Imaging Research Department of Biomedical EngineeringTsinghua University School of MedicineBeijingChina Department of Neurosurgery Peking University Third HospitalBeijingChina

Objective To determine the association of carotid plaque features with collateral circulation status in elderly patients with moderate to severe carotid *** Elderly patients(>60 years)with moderate to severe carotid stenosis were recruited and categorized into good and poor collateral circulation groups,and underwent magnetic resonance imaging and computed tomography *** carotid plaque features including lipid-rich necrotic core,intraplaque hemorrhage,calcification,and fibrous cap rupture(FCR)were evaluated,and maximum wall thickness,normalized wall index(NWI),and luminal stenosis were *** association between these variables and collateral circulation status was *** Of the 97 patients(78 males,mean age:69.0±6.1 years),19(19.6%)had poor *** poor collateral group had a significantly higher NWI(93.7%±5.0%vs.89.0%±7.9%,P=0.011),a greater extent of stenosis(80.0%±11.4%vs.75.3%±9.4%,P=0.036)and FCR(84.2%vs.55.1%,P=0.020)compared with good collateral *** NWI(OR=3.83,95%CI:1.36–10.82,P=0.011)and more FCR(OR=6.77,95%CI:1.35–33.85,P=0.020)were associated with poor collateral circulation after adjustment for the confounding *** combination of NWI,FCR,systolic blood pressure,and triglycerides had the highest area-under-the-curve(AUC=0.85)for detection of poor *** Carotid plaque features,specifically NWI and FCR,are independently associated with poor collateral circulation,and the combination of carotid plaque features and traditional risk factors has a stronger predictive value for poor collateral circulation than plaque features alone.

关键词： Atherosclerosis Carotid stenosis Collateral circulation Computed tomography angiography Magnetic resonance imaging

Fiducial Approach for the Storage Reliability Assessment of Complex Repairable Systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2024年第4期37卷 1653-1671页

作者： yang yang ZHAO Letian CHEN Siyi YU dan University of Chinese Academy of Sciences Beijing 100190China Computer Application Institute of Nuclear Industry Beijing 100142China Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China

In recent years,there has been a growing focus on high-reliability products in industrial and military *** plays a crucial role in these products,and as a result,research on storage reliability has gained more *** paper specifically targets a class of products with complex structures that require long-term storage,regular testing,and ***,an expression method for system availability is provided based on the reliability structure of the system and the maintenance situation of the constituent equipment in *** the expression of system availability is typically complex and difficult to compute,and the storage life of the system cannot be represented as an explicit function of the reliability indicators of the constituent equipment,it is challenging to evaluate the availability and storage life of repairable *** address this,the paper proposes a comprehensive evaluation methodology for assessing the storage reliability of complex repairable systems based on fiducial *** approach is employed to derive point estimates and determine the lower fiducial limits for both system availability and storage ***,simulation results demonstrate that this comprehensive evaluation method for storage reliability of complex repairable systems is not only convenient but also highly effective.

关键词： Availability fiducial method repairable system storage life

Application of a microscopic optical potential of chiral effective field theory in (p, d) transfer reactions

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第1期35卷 134-144页

作者： Yi-Ping Xu Si-Lu Chen dan-yang Pang School of Nuclear Science and Engineering North China Electric Power UniversityBeijing 102206China School of Physics Beihang UniversityBeijing 100191China

The microscopic global nucleon–nucleus optical model potential(OMP)proposed by Whitehead,Lim,and Holt,the WLH potential(Whitehead et al.,Phys Rev Lett 127:182502,2021),which was constructed in the framework of many-body per-turbation theory with state-of-the-art nuclear interactions from chiral effective field theory(EFT),was tested with(p,d)transfer reactions calculated using adiabatic wave *** target nuclei included both stable and unstable nuclei,and the incident energies reached 200 *** results were compared with experimental data and predictions using the phenomenological global optical potential of Koning and Delaroche,the KD02 ***,we found that the micro-scopic WLH potential described the(p,d)reaction angular distributions similarly to the phenomenological KD02 potential;however,the former was slightly better than the latter for radioactive *** average,the obtained spectroscopic factors(SFs)using both microscopic and phenomenological potentials were similar when the incident energies were below approxi-mately 120 ***,their difference tended to increase at higher incident energies,which was particularly apparent for the doubly magic target nucleus 40Ca.

关键词： Microscopic optical model potential (p,d)transfer Spectroscopic factors

Application of Optical Hydrogels in Environmental Sensing

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2024年第3期7卷 311-336页

作者： Shuo yang Shruti Sarkar Xing Xie dan Li Jianmin Chen Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention(LAP3) Department of Environmental Science and EngineeringFudan UniversityShanghai 200438China School of Civil and Environmental Engineering Georgia Institute of TechnologyAtlanta Georgia 30332USA

The ever-increasing complexity of environmental pollutants urgently warrants the development of new detection *** based on the optical properties of hydrogels enabling fast and easy in situ detection are attracting increasing *** this paper,the data from 138 papers about different optical hydrogels(OHs)are extracted for statistical *** detection performance and potential of various types of OHs in different environmental pollutant detection scenarios were evaluated and compared to those obtained using the standard detection *** on this analysis,the target recognition and sensing mechanisms of two main types of OHs are reviewed and discussed:photonic crystal hydrogels(PCHs)and fluorescent hydrogels(FHs).For PCHs,the environmental stimulus response,target receptors,inverse opal structures,and molecular imprinting techniques related to PCHs are reviewed and ***,the different types of fluorophores(i.e.,compound probes,biomacromolecules,quantum dots,and luminescent microbes)of FHs are ***,the potential academic research directions to address the challenges of applying and developing OHs in environmental sensing are proposed,including the fusion of various OHs,introduction of the latest technologies in various fields to the construction of OHs,and development of multifunctional sensor arrays.

关键词： environmental sensors fluorescent hydrogel optical hydrogel photonic crystal hydrogel pollution detection