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suppressing the Impedance Rise of LiNi_(0.8)Co_(0.2)O_2/Graphite Cells by Al, Ti and Mg Doping

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过程工程学报 2004年第1期4卷 59-63页

作者：陈春华谢松柳俊 Amine k Dept. Mat. sci.& Eng. University of Science and Technology of China Hefei Anhui 230026 China Electrochem. Technol. Progy. Chem. Technol. Div. ANL. Argonne Illinois 60439 USA

The research on utilizing lithium-ion batteries with LiNi0.8Co0.2O2-based cathode for hybrid electric vehicles is intensively underway in several national laboratories of Us Department of Energy. The impedance of LiNi0.8Co0.2O2/graphite lithium-ion cells is observed to experience a substantial rise during accelerated calendar life storage, due mainly to the significant increase of the interfacial resistance on the cathode side. By means of electrochemical measurements and AC impedance spectroscopy, it is found that doping the LiNi0.8Co0.2O2 cathode with small amount of Al, Ti and Mg can effectively suppress this impedance rise. Possible mitigation of oxidizing ability of Ni4+ due to Al, Ti and Mg doping is proposed to achieve this impedance stabilization.

关键词：掺杂铝钛镁电池电极阻抗

General relativistic calculations for white dwarfs

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Research in Astronomy and Astrophysics 2017年第6期17卷 107-116页

作者： Arun Mathew Malay k. Nandy Department of Physics Indian Institute of Technology Guwahati Guwahati 781 039 India

The mass-radius relations for white dwarfs are investigated by solving the Newtonian as well as Tolman-Oppenheimer-Volkoff （TOV） equations for hydrostatic equilibrium assuming the electron gas to be non-interacting. We find that the Newtonian limiting mass of 1.4562 M is modified to 1.4166 M in the general relativistic case for 4He （and 12 6C） white dwarfs. Using the same general relativistic treatment, the critical mass for 56 26Fe white dwarfs is obtained as 1.2230 M. In addition, departure from the ideal degenerate equation of state （Eos） is accounted for by considering salpeter＇s Eos along with the TOV equation, yielding slightly lower values for the critical masses, namely 1.4081 M for 4He, 1.3916M for 12C and 1.1565M for 56 26Fe white dwarfs. We also compare the critical densities for gravitational instability with the neutronization threshold densities to find that 4 2He and 12 6C white dwarfs are stable against neutronization with the critical values of 1.4081 M and 1.3916 M, respectively. However, the critical masses for 16 8O, 20 10Ne, 24 12Mg, 28 14si,32 16s and 56 26Fewhite dwarfs are 26Fe white lower due to neutronization. Corresponding to their central densities for neutronization thresholds, we obtain their maximum stable masses due to neutronization by solving the TOV equation coupled with the salpeter Eos.

关键词： equation of state - hydrodynamics-instabilities - relativistic processes - stars whitedwarfs

Advances in managing hepatocellular carcinoma

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Frontiers of Medicine 2014年第2期8卷 175-189页

作者： Marielle Reataza David k. Imagawa University of California lrvine Medical Center Orange CA 92868 USA Division of Hepatobiliary and Pancreas surgery Department of Surgery University of California Irvine Medical Center Orange CA 92868 USA

Multiple modalities for treatment of hepatocellular carcinoma are available, depending on tumor size and number. surgical resection remains the gold standard, so long as the residual liver function reserve is sufficient. In patients with advanced cirrhosis, liver transplantation is the preferred option, as these patients may not have adequate hepatic reserve after resection. salvage liver transplantation has also become an option for a select few patients who recur after surgical resection. Ablative techniques have been used for palliation as well as to either completely destroy the tumor, act as an adjunct to resection, or downstage the tumor to meet Milan criteria such that a patient may be a candidate for liver transplantation. Radiofrequency ablation, microwave ablation, chemoembolization, radioembolization, and irreversible electroporation have all been used in this capacity. Currently, sorafenib is the only Us Food and Drug Administration-approved chemotherapeutic for hepatocellular carcinoma. The efficacy of sorafenib, in combination with other agents, transarterial chemoembolization, and surgical resection is currently being investigated. sunitinib and brivanib, tyrosine kinase inhibitors, have failed as potential first- or second-line options for chemotherapy. Bevacizumab in combination with erlotinib is also currently being studied. Final analysis for ramucirumab and axitinib are pending. Tivantinib, a selective mesenchymai-epithelial transition factor （MET） inhibitor, is also undergoing clinical trials for efficacy in MET- high tumors. This review serves to emphasize the current and new technologies emerging in the treatment of hepatoeellular carcinoma.

关键词： hepatocellular carcinoma radiofrequency ablation microwave ablation chemoembolization radioembolization sorafenib irreversible electroporation

Mechanisms of neuronal membrane sealing following mechanical trauma

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Neuroscience Bulletin 2014年第4期30卷 627-644页

作者： Benjamin k.Hendricks Riyi shi Department of Basic Medical sciences College of Veterinary MedicineWeldon School of Biomedical EngineeringPurdue UniversityWest LafayetteIndianaUSA Indiana University school of Medicine-Lafayette West LafayetteIndianaUSA

Membrane integrity is crucial for maintaining the intricate signaling and chemically-isolated intracellular environment of neurons; disruption risks deleterious effects, such as unregulated ionic flux, neuronal apoptosis, and oxidative radical damage as observed in spinal cord injury and traumatic brain injury. This paper, in addition to a discussion of the current understanding of cellular tactics to seal membranes, describes two major factors involved in membrane repair. These are line tension, the hydrophobic attractive force between two lipid free-edges, and membrane tension, the rigidity of the lipid bilayer with respect to the tethered cortical cytoskeleton. Ca2~, a major mechanistic trigger for repair processes, increases following flux through a membrane injury site, and activates phospholipase enzymes, calpain-mediated cortical cytoskeletal proteolysis, protein kinase cascades, and lipid bilayer microdomain modification. The membrane tension appears to be largely modulated through vesicle dynamics, cytoskeletal organization, membrane curvature, and phospholipase manipulation. Dehydration of the phospholipid gap edge and modification of membrane packaging, as in temperature variation, experimentally impact line tension. Due to the time-sensitive nature of axonal sealing, increasing the efficacy of axolemmal sealing through therapeutic modification would be of great clinical value, to deter secondary neurodegenerative effects. Better therapeutic enhancement of membrane sealing requires a complete understanding of its intricate underlying neuronal mechanism.

关键词： axolemmal sealing membrane tension line tension phospholipase calpain poly-ethylene glycopatch model

Image processing algorithms for in-field cotton boll detection in natural lighting conditions

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Artificial Intelligence in Agriculture 2021年第1期5卷 142-156页

作者： Naseeb singh V.k.Tewari P.k.Biswas C.M.Pareek L.k.Dhruwa Department of Agricultural and Food Engineering IIT KharagpurKharagpur 721302India Department of Electronics and Electrical Communication Engineering IIT KharagpurKharagpur 721302India

In developing countries,the cotton harvesting operation is currently being performed *** to the monotonous nature of this task and the involvement of a considerable amount of labor,this operation becomes very tedious and *** harvesting robots can be a good alternative for the selective picking of cotton bolls from the *** this study,an attempt has been made to develop the image processing algorithms for in-field cotton boll detection in natural lighting conditions for the cotton harvesting *** image processing algorithms namely color difference,band ratio,YCbCr method,and chromatic aberration were proposed for the real-time segmentation of cotton bolls under natural outdoor light *** performance of developed image processing algorithms was evaluated and the experimental results revealed that the chromatic aberration method outperforms as compared to other developed *** chromatic aberration method showed the highest identification rate of 91.05%with false positive and false negative rates of 6.99%and 4.88%respectively,among all the proposed *** highest sensitivity and specificitywere found to be 81.31%and 97.53%,respectively,using the chromatic aberration ***,the chromatic aberration approach demonstrated a very promising performance for in-field cotton bolls detection under natural lighting conditions which confirms its applicability for the robotic cotton harvesters.

关键词： Cotton recognition Image segmentation Color models Color thresholding

Effect of austenitization heat treatment on the magnetic properties of Fe-40wt%Ni-2wt%Mn alloy

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Journal of University of science and Technology Beijing 2007年第4期14卷 327-330页

作者： s. Buyukakkas H. Aktas s. Akturk Department of Physics Science and Arts Faculty of Nigde University Nigde Turkey Department of Physics Science and Arts Faculty of Kirikkale University Yahsihan 71450 Kirikkale Turkey

The effect of austenitization heat treatment on magnetic properties was examined by means of M6ssbauer spectroscopy on an Fe-40wt%Ni-2wt%Mn alloy. The morphology of the alloy was obtained by using scanning electron microscopy （sEM） under different heat treatment conditions. The magnetic behavior of the non heat-treated alloy is ferromagnetic. A mixed magnetic structure including both paramagnetic and ferromagnetic states was obtained at 800℃ after 6 and 12 h heat treatments. In addition, the magnetic structure of the heat-treated alloy at 1150~C for 12 h was ferromagnetic. With the volume fraction changing, the effective hyperfine field of the ferromagnetic austenite phase and isomery shift values were also determined by Mtssbauer spectroscopy.

关键词： Mossbauer spectroscopy scanning electron microscopy dentrite ferromagnetic austenite

Multi-layer 3D chirality:its enantioselective synthesis and aggregation-induced emission

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National science Review 2021年第1期8卷 7-9页

作者： Junliang Zhang László kürti Department of Chemistry Fudan University Department of Chemistry Rice University

Chirality has been extensively studied in interdisciplinary fields for almost two centuries since its ubiquity was discovered by Louis Pasteur in 1848, when he successfully separated a pair of enantiomers. Indeed, chirality is present at all levels in nature—in the form of subatomic particles, macromolecules such as proteins and DNA, microscopic living organisms such as helical bacteria and even in the form of macroscopic objects such as sea shells and spiral galaxies.

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A transverse local feedback linearization approach to human head movement control

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Control Theory and Technology 2017年第4期15卷 288-300页

作者： Oki, Takafumi Ghosh, Bijoy k. Department of Mathematics and statistics Texas Tech University Lubbock U.S.A.

In the mid-nineteenth century, Donders had proposed that for every human head rotating away from the primary pointing direction, the rotational vectors in the direction of the corresponding axes of rotation, is restricted to lie on a surface. Donders＇ intuition was that under such a restriction, the head orientation would be a function of its pointing direction. In this paper, we revisit Donders＇ Law and show that indeed the proposed intuition is true for a restricted class of head-orientations satisfying a class of quadratic Donders＇ surfaces, if the head points to a suitable neighborhood of the frontal pointing direction. Moreover, on a suitably chosen subspace of the 3D rotation group sO（3）, we describe a head movement dynamical system with input control signals that are the three external torques on the head provided by muscles. Three output signals are also suitably chosen as follows. Two of the output signals are coordinates of the frontal pointing direction. The third signal measures deviation of the state vector from the Donders＇ surface. We claim that the square system is locally feedback linearizable on the subspace chosen, and the linear dynamics is decomposed into parts, transverse and tangential to the Donders＇ surface. We demonstrate our approach by synthesizing a tracking and path-following controller. Additionally, for different choices of the Donders＇ surface parameters, head gaits are visualized by simulating different movement patterns of the head-top vector, as the head-pointing vector rotates around a circle.

关键词： Head movement Donders' surface transverse feedback linearization Fick-Gimbal

Axon regeneration:membrane expansion and lipidomics

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Neural Regeneration Research 2022年第5期17卷 989-990页

作者： sean Meehan sanjoy k.Bhattacharya Graduate Program in Molecular and Cellular Pharmacology Miami Integrative Metabolomics Research CenterBascom Palmer Eye InstituteUniversity of MiamiMiamiFLUSA

Axon regeneration requires protein synthesis and membrane *** presence of granular material was discovered in the perikaryon of neurons but not axons using Nissl staining(Gomes,2019).This is one of the characteristic ... 详细信息

关键词： expansion. expansion regeneration