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Design,synthesis and characterization of novel poly(urethane-urea) based on a macrodiol from poly(lactic acid) and poly(p-dioxanone)

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Chinese Chemical Letters 2011年第2期22卷 237-240页

作者： yan Feng luo Key Lab of Biorheological Science and Technology (Chongqing University) Ministry of Education College of Bioengineering Chongqing University Chongqing 400030 China Research Center of Bioinspired Material Science and Engineering College of Bioengineering Chongqing University Chongqing 400030 China Department of Biology Chongqing University of Science and Technology Chongqing 401331 China Received 29 June 2010

A series of novel poly（urethane-urea）（PUU） was synthesized from poly（lactide-co-p-dioxanone） macrodiol（HO-P（LA-co-PDO）-OH）, hexamethylene diisocyanate（HDI） and butanediamine（BDA）.The obtained PUU,which is recorded as P（LA-co-PDO）-PUU here,may demonstrate enhanced phase separation and thus improved shape memory *** was employed to characterize the copolymers,and the effects of NCO/OH molar ratios on Tg of PUU was investigated by means of differential scanning calorimetry （DSC）.The results revealed the successful synthesis of P（LA-co-PDO）-*** addition,the Tg of P（LA-co-PDO）-PUU increased from 37.9℃to 44.2℃with the increase NCO/OH ratios from 1.1 to *** P（LA-co-PDO）-PUU with Tg close to body temperature will have potential applications as shape memory polymers in biomedical fields,especially in minimally invasive surgery.

关键词： Poly(urethane-urea) Polylactic acid p-Dioxanone Butanediamine Shape memory polymer

The focal depths of the 2008 Panzhihua earthquake sequence and the stress field in the source region

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Science China Earth Sciences 2020年第3期63卷 439-451页

作者： yan luo Li ZHAO Jianhui TIAN Key Laboratory of Earthquake Prediction Institute of Earthquake ForecastingCEABeijing 100036China School of Earth and Space Sciences Peking UniversityBeijing 100871China

Focal depths of the 2008 Ms6.1 Panzhihua earthquake sequence and tectonic stress field in the source area are *** depths of 24 earthquakes in Panzhihua earthquake sequence with a magnitude M≥3.0 were determined using the seismic depth phase sPL;additionally,the focal depths of 232 earthquakes were measured by fitting the threecomponent waveforms of the P and S *** source depth of the main shock is^12 *** majority of the aftershocks with magnitude M≥3.0 occurred in the brittle upper crust at the depths range of 12-18 ***,the Source mechanisms of the 232events around the Panzhihua earthquake source area were determined,and the results show that the earthquakes have predominantly strike-slip mechanisms in the Dianzhong Block,but display complexity of the focal mechanisms outside and near the boundary of the Dianzhong *** 232 earthquake mechanisms from this study are combined with the solutions from the Global Centroid Moment Tensor (GCMT) catalog to derive 2D stress *** inversion results show that the Dianzhong block is predominantly under a strike slip faulting regime and the direction of the maximum principal compressionσ1 is northwestsoutheast (NW-SE)-*** distribution is coincide with GPS velocity ***,orientations of principal stress axes as well as the faulting types change outside and near the Dianzhong *** results show that the tectonic stress field in the study area is predominantly controlled by the southeast (SE)-trending horizontal movement and clockwise rotation of the Dianzhong block as a result of the eastward movement of eastern Tibetan meeting the old and rigid South China block (SCB).The Panzhihua earthquake ruptured at^12 km depth where the tectonic stress regime is under the SE-direction horizontal compression and the NE-direction horizontal extension.

关键词： Panzhihua earthquake sequence Depth phase Focal mechanism solution Tectonic stress field

Adiponectin:a versatile player of innate immunity

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Journal of Molecular Cell Biology 2016年第2期8卷 120-128页

作者： yan luo Meilian Liu Institute of Metabolism and Endocrinology Metabolic Syndrome Research Centerthe Second Xiangya HospitalCentral South UniversityChangsha 410011China Department of Biochemistry and Molecular Biology University of New Mexico Health Sciences CenterAlbuquerqueNM 87131USA

Adiponectin acts as a key regulator of the innate immune system and plays a major role in the progression of inflammation and metabolic *** and monocytes are representative components of the innate immune system,and their proliferation,plasticity,and polarization are a key component of metabolic ***-like lymphocytes such as group 2 innate lymphoid cells(ILC2s),natural killer T(NKT)cells,and gamma delta T(gd T)cells are also members of the innate immune system and play important roles in the development of obesity and its related *** senses metabolic stress and modulates metabolic adaption by targeting the innate immune system under physiological and pathological *** the mechanisms underlying the role of adiponectin in regulating innate immunity is crucial to adiponectin-based therapeutic intervention.

关键词： adiponectin innate immunity macrophage innate-like lymphocyte

Study on the instantaneous protection reliability of low voltage circuit breakers

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第3期8卷 370-377页

作者： LU Jian-guo DU Tai-hang luo yan-yan Electrical Apparatus Institute Hebei University of Technology Tianjin 300130 China

This paper outlines the significance of enhancing the instantaneous protection reliability of low voltage circuit breakers and describes their main failure modes. The instantaneous failure mechanism of low voltage circuit breakers was analyzed so that measures to improve instantaneous protection reliability can be determined. Furthermore, the theory of the instantaneous characteristics calibration device for low voltage circuit breakers and the method of eliminating the non-periodic component of test current are given in detail. Finally, the test results are presented.

关键词： Low voltage circuit breakers Instantaneous protection reliability Non-periodic component of current Phase selective closing

Impact of community public health care on treatment effect,health cognition,and self-management in patients with type 2 diabetes

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World Journal of Clinical Cases 2025年第5期13卷 22-29页

作者： Hong Shi Chun Liu Hong-yan luo Department of Infrastructure Operation West China Hospital of Sichuan UniversityChengdu 610041Sichuan ProvinceChina Department of Public Health Minzu Street Community Health Service CenterWuhan 430000Hubei ProvinceChina Caotang Community Health Service Center Chengdu 610031Sichuan ProvinceChina

BACKGROUND At present,China has become the country with the largest number of individuals with diabetes mellitus(DM)in the world,with a total of approximately 140 million patients,the majority of whom have type 2 DM(T2DM).Based on conven-tional nursing methods,community home care has important clinical significance in controlling blood sugar and disease *** To explore the impact of community public health nursing on treatment effect,health cognition,and self-management in patients with *** One hundred patients with T2DM were selected as the research *** patients were divided into either a conventional nursing group or community nursing(CN)group using the random number table *** conventional nursing group(50 cases)received routine care,while the CN group(50 cases)received community public health care in addition to routine care as that for the conventional nursing *** rate of excellent and good blood glucose control,fasting blood glucose before and after care,2-h postprandial blood glucose,health cognition,and self-management ability,and patient satisfaction were compared between the two *** The CN group had a higher rate of excellent blood sugar control than the conventional nursing group(88%vs 70%,P0.05).After nursing,fasting blood glucose and 2-h postprandial blood glucose were reduced to varying degrees in both groups,and both blood glucose levels in the CN group were lower than those of the conventional nursing group(P<0.05).Compared with the scores before care,the cognitive level score for diabetes and self-management ability score improved after care in both *** cognitive level and self-management ability of patients in the CN group were higher than those of the conventional nursing group(P<0.05).The overall satisfaction of the CN group was better than

关键词： Community public health care Type 2 diabetes Blood sugar control Self-management ability Cognition level

Surface modification of natural cellulose substances:toward functional materials and applications

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Science China Chemistry 2014年第12期57卷 1672-1682页

作者： luo yan HUANG Jian Guo Department of Chemistry Zhejiang University

Combining various synthetic chemical processes and biological assemblies provides a promising strategy for the design and fabrication of functional materials with tailored structures and *** unique multilevel structures and morphologies of natural cellulose substances such as ordinary commercial laboratory filter paper make them ideal platforms for the self-assemblies of various functional guest molecules that are to be deposited on the surfaces of their fine structures,and the resulting composite matters show significant potentials for various *** surface sol-gel process was employed to deposit ultrathin metal-oxide(e.g.,titania and zirconia)gel films to coat the cellulose nanofibers in bulk filter papers;thereafter,monolayers of specific guest substrates were immobilized onto the surfaces of the metal-oxide gel *** selective,sensitive,and reversible chemosensors based on the surface modification of filter paper were obtained toward the fluorescence and colorimetric detection of various analytes such as heavy-metal ions,inorganic anions,amino acids,and *** composite materials with superhydrophobic,antibacterial,or luminescent properties were fabricated by self-assembly approaches toward practical applications.

关键词： cellulose self-assembly thin films surface modification

Triplet fusion delayed fluorescence materials for OLEDs

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Chinese Chemical Letters 2016年第8期27卷 1223-1230,1466页

作者： yan-Ju luo Zhi-Yun Lu yan Huang College of Chemistry Sichuan University

The development of fluorescent materials capable of harvesting triplet excitons efficiently is of great importance in achieving high-performance low-cost organic light-emitting diodes（OLEDs）.Among the three mechanisms converting triplet to singlet excitons,triplet fusion delayed fluorescence（TFDF） plays a key role in the demonstration of highly efficient and reliable OLEDs,especially blue devices,for practice *** review focuses on the recent development of TFDF materials and their applications in *** TFDF mechanism,molecular design principles,and the structure-property relationship of TFDF materials with a particular emphasis on their different excited state characters,are presented and ***,the future perspectives and ongoing challenges of TFDF materials are also highlighted.

关键词： Triplet exciton harvesting Triplet fusion delayed fluorescence Organic light-emitting diode Local excited state Charge transfer

Effect of three-electrode plasma synthetic jet actuator on shock wave control

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Science China(Technological Sciences) 2017年第1期60卷 146-152页

作者： ZHOU yan XIA ZhiXun luo ZhenBing WANG Lin Science and Technology on Scramjet Laboratory National University of Defense Technology Changsha 410073 China

A three-electrode high-energy plasma synthetic jet(PSJ) actuator was used for shock wave control. This actuator is an enhanced version of the two-electrode actuator as a high-voltage trigger electrode is added to increase the cavity volume and the input energy while retaining a relatively low disruptive voltage. The electrical properties were studied using current-voltage measurements, and the energy consumption was calculated. To assess the jet strength, the penetration of PSJ was compared with empirical values, and the results show that the momentum flux ratio of PSJ for a capacitance of 0.96, 1.6, and 3 μF was approximately equal to 0.6, 1.0, and 1.3, respectively. The interaction of PSJ with shock waves was acquired using high-speed shadowgraph imaging. The shock was generated by a 25° compression ramp in Mach 2 flow, and PSJ actuator was placed up-stream of the compression ramp. Under the action of PSJ, the strength of the shock was notably weakened, and the near-wall part of the shock was entirely eliminated. The results show the good control effect of the three-electrode high-energy PSJ in high-speed flow.

关键词： plasma synthetic jet three-electrode shock wave active flow control

Bifurcation-Based Stability Analysis of Electrostatically Actuated Micromirror as a Two Degrees of Freedom System

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Computer Modeling in Engineering & Sciences 2018年第3期114卷 261-276页

作者： Kuntao Ye yan luo Yingtao Jiang Jiangxi University of Science and Technology School of ScienceGanzhouJiangxiChina 341000 University of Nevada Las Vegas Department of Electrical and Computer EngineeringLas VegasNVUSA 89154

Torsional micromirror devices have been widely used in micro displays,RF switches,optical communications,and optical coherence tomography *** order to study the stability of electrostatically driven torsional micromirror system with double bottom plates and two voltage sources,a dimensionless,two degrees of freedom(2-DoF)dynamic model was *** by the dimensionless phase space model equation,the pull-in and bifurcation phenomena were analyzed using the Hamiltonian method and numerical *** particular,the influence of the damping coefficient and the torsion-bending coupling effect on the phase trajectory was ***,the conditions that can lead to pull-in were numerically determined for saddle-node,pitchfork and Hopf bifurcations in the framework of 2-DoF *** showed that the dynamic pull-in voltage as predicted by the proposed 2-DoF system model is considerably lower than that by the one degree of freedom(1-DoF)system *** was also confirmed that the pull-in voltage varies with the damping coefficient and/or the ratio of the two voltages applied to the bottom plates of the *** modelling method and stability analysis presented in this paper shall provide valuable insight to the design and control of electrostatically actuated micromirror systems.

关键词： MEMS micromirror bifurcation pull-in stability phase trajectories DoF