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Improvement of isothermal oxidation resistance of aγ'-strengthened Co-Al-W-Mo-Ta-B alloy at 800℃via doping Ce

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Rare Metals 2021年第8期40卷 2065-2075页

作者： Fei Zhong Zhuo-Lin Tao Jiang-Bo sha School of Materials Science and Engineering Beihang UniversityBeijing100191China College of Chemistry and Materials Science Hubei Engineering UniversityXiaogan432000China

Isothermal oxidation resistance,oxide scale evolution and failure mechanism of Ce-doped Co-Al-W-MoTa-B alloy(0.01 at%,0.05 at%,0.10 at%and 0.20 at%Ce)exposed at 800℃were *** 0.01 Ce and 0.05 Ce alloys were consisted ofγ/γ’coherent micro structure,while theκ-Co_(3)W compound precipitated at the grain boundary of the 0.1 OCe and 0.20 Ce alloys in addition to theγ/γ’*** oxidation kinetics curves of the Cedoped alloys exhibited a parabolic time dependence on the weight *** an increasing nominal Ce content,the weight gain of the Co-Al-W-Mo-Ta-B alloys monotonically *** oxide scale composed of a dense and uniform outer Co_(3)O_(4)+CoO layer,a middle CoAl2 O4 and CoWO4 compound layer and an inner Al_(2)O_(3)*** excellent oxidation resistance of 0.2 Ce alloy was mainly attributed to a shorter incubation stage for the formation of the continuous and protective Al_(2)O_(3)layer and the thickest Al_(2)O_(3)layer during entire oxidation process.

关键词： Co-Al alloy Intermetallics Ce doping Oxidation

Guaranteeing Wireless Communication Secrecy via a WFRFT-Based Cooperative System

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China Communications 2015年第9期12卷 76-82页

作者： Fang Xiaojie sha Xuejun Mei Lin Communication Research Center Harbin Institute of Technology

In this paper, a weighted fractional Fourier transform(WFRFT) based cooperative overlay system, aiming to guarantee physical layer(PHY) security, is proposed. The paper elaborates how WFRFT and physical layer properties of the wireless medium are collaborated to guarantee the secrecy of wireless transmissions. In the proposed system, WFRFT is first preform on the secret data, such that the transmitted signal is distorted and can only be neutralized by inverse-WFRFT with the same parameter. And then two streams of the transformed sequences that bearing different messages are cooperatively and simultaneously transmitted to two legitimate receivers via a beamforming-liked method, respectively. In general, both the rapid spatial decorrelation property and the inherent security features of WFRFT are leveraged, such that only the eavesdropper's is degraded, and hence, the wireless communication secrecy is reliably guaranteed. Numerical simulations are conducted to evaluate the performance of the proposed system in terms of the average bit error rate and the secrecy capacity.

关键词： weighted fractional Fourier trans-form(WFRFT) physical layer(PHY) security secrecy capacity

3D tumor model biofabrication

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Bio-Design and Manufacturing 2021年第3期4卷 526-540页

作者： Ming Li Xueer Song sha Jin Kaiming Ye Department of Biomedical Engineering Center of Biomanufacturing for Regenerative MedicineBinghamton UniversityState University of New York(SUNY)PO Box 6000BinghamtonNY 13902USA

Animal models have been extensively used in cancer pathology studies and drug *** models,however,fail to reflect the complex human tumor microenvironment and do not allow for high-throughput drug screening in more human-like physiological ***-dimensional(3D)cancer models present an alternative to automated high-throughput cancer drug discovery and *** this review,we highlight recent technology innovations in building 3D tumor models that simulate the complex human tumor microenvironment and responses of patients to *** discussed various biofabrication technologies,including 3D bioprinting techniques developed for characterizing tumor progression,metastasis,and response to treatment.

关键词： Tumor models Biofabrication Tumor spheroids Microfluidic devices 3D bioprinting

An improved interval model updating method via adaptive Kriging models

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Applied Mathematics and Mechanics(English Edition) 2024年第3期45卷 497-514页

作者： sha WEI Yifeng CHEN Hu DING Liqun CHEN shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Frontier Science Center of MechanoinformaticsShanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072China shanghai Institute of Aircraft Mechanics and Control Shanghai 200092China

Interval model updating(IMU)methods have been widely used in uncertain model updating due to their low requirements for sample ***,the surrogate model in IMU methods mostly adopts the one-time construction *** makes the accuracy of the surrogate model highly dependent on the experience of users and affects the accuracy of IMU ***,an improved IMU method via the adaptive Kriging models is *** method transforms the objective function of the IMU problem into two deterministic global optimization problems about the upper bound and the interval diameter through universal grey *** optimization problems are addressed through the adaptive Kriging models and the particle swarm optimization(PSO)method to quantify the uncertain parameters,and the IMU is *** the construction of these adaptive Kriging models,the sample space is gridded according to sensitivity *** sampling is then performed in key subspaces based on the maximum mean square error(MMSE)*** interval division coefficient and random sampling coefficient are adaptively adjusted without human interference until the model meets accuracy *** effectiveness of the proposed method is demonstrated by a numerical example of a three-degree-of-freedom mass-spring system and an experimental example of a butted cylindrical *** results show that the updated results of the interval model are in good agreement with the experimental results.

关键词： interval model updating(IMU) non-probabilistic uncertainty adaptive Kriging model surrogate model grey number

Early screening for post-stroke depression and its effect on functional outcomes, quality of life, and mortality: A meta-analysis

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World Journal of Psychiatry 2024年第9期14卷 1397-1403页

作者： Jie Dai sha-sha Zhao Su-Xiang Zhang Department of Neurology 6 Cangzhou Central HospitalCangzhou 061001Hebei ProvinceChina

BACKGROUND Post-stroke depression(PSD)is a common and debilitating condition affecting stroke survivors,significantly impacting their recovery and overall quality of *** To assess the effects of early PSD screening on functional outcomes,quality of life,and *** From an initial pool of 1065 articles,6 studies met the inclusion criteria and were selected for *** outcomes were measured using the functional independence measure(FIM).RESULTS The analysis revealed a significant improvement in FIM scores for a PSD scree-ning group compared to controls[standardized mean difference(SMD)=8.90,95%confidence interval(CI):4.65-13.15,P<0.01].Quality of life was assessed using the Stroke-Specific Quality of Life Scale,with the screening group showing significantly higher scores(SMD=20.83,95%CI:15.27-26.38,P<0.01).Mortality analysis indicated a reduction in five-year mortality rates for the PSD screening *** Early PSD screening enhances functional recovery,improves quality of life,and reduces mortality rates in stroke ***,integrating PSD screening into routine stroke care improves long-term outcomes for patients.

关键词： Post-stroke depression Early screening Functional outcomes Quality of life Mortality

Terrestrial End-Triassic Mass Extinction and the Triassic/Jurassic Boundary of the Junggar Basin,NW China:A Brief Review

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Acta Geologica Sinica(English Edition) 2019年第S1期93卷 138-139页

作者： sha Jingeng State Key Laboratory of Palaeobiology and Stratigraphy Nanjing Institute of Geology and PalaeontologyChinese Academy of SciencesNanjing 210008China

1 Introduction The end-Triassic mass extinction event is one of the five global mass extinctions,and destroyed both the marine and terrestrial biological *** years the marine endTriassic mass extinction(ETE)event has been widely studied and discussed,and the standard marine Triassic/Jurassic boundary(TJB)(base-Jurassic)has also been ***.

关键词： terrestrial end-Triassic mass extinction event climate variability orbital cyclicity Junggar Basin

PTCs promoted biphasic oxidation of ethylbenzene catalyzed by NHPI and CoSPc

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Chinese Chemical Letters 2012年第8期23卷 895-898页

作者： Yu Lu Zhou sha sha Lin Dao Hong Xia Yu Zhi Xiang College of Science State Key Laboratory of Heavy OilChina University of PetroleumQingdao 266580China

An easy workup and environmentally friendly method to convert ethylbenzene into the corresponding oxides, catalyzed by a combined catalytic system consisting of NHPI and CoSPc, was developed in a water involved liquid-liquid heterogeneous system. Experimental results showed that the reaction performed well facilitated by PTCs at multigrams material level, under which the conversion rate of ethylbenzene and the selectivity of acetophenone reached 60.6% and 95.2% after 0.5 h of reaction in oxygen atmosphere. An oxidation process was orooosed at the end of this oaoer.

关键词： Ethylbenzene Aerobic oxidation NHPI CoSPc PTC

PLA_(2) mediates the innate immune response in Asian corn borer, Ostrinia furnacalis

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Insect Science 2022年第1期29卷 245-258页

作者： Jia-Yue Ji Zhao-Hua Yin sha-sha Zhang Dong-Xu Shen Chun-Ju An Department of Entomology College of Plant ProtectionChina Agricultural UniversityBeijing100193China Jiangsu Key Laboratory of Sericutural Biology and Biotechnology School of BiotechnologyJiangsu University of Science and TechnologyZhenjiangJiangsu212018China Key Laboratory of Silkworm and Mulberry Genetic Improvement Ministry of Agriculture and Rural AffairsSericultural Research InstituteChinese Academy of Agricultural SciencesZhenjiangJiangsu212018China

The eicosanoid signaling pathway mediates insect immune reactions to a wide range of stimuli. This pathway begins with the biosynthesis of arachidonic acid (AA) from the hydrolysis of phospholipids catalyzed by phospholipase A_(2) (PLA_(2)). We report here that the PLA_(2) inhibitor, dexamethasone (DEX), impaired the innate immune response including nodulation, encapsulation, and melanization in Ostrinia furnacalis larvae, while AA partially reversed these effects of DEX. We cloned a full-length complementary DNA encoding a PLA_(2), designated as OfsPLA_(2), from O. furnacalis. The open reading frame of OfsPLA_(2) encodes a 195-amino acid residue protein with a 22-residue signal peptide. Sequence alignment analyses indicated that O. furnacalis PLA_(2) might be a Group III secretory PLA_(2). The highest transcript levels of OfsPLA_(2) were detected in the fat body, and its transcript levels increased dramatically after infection with Escherichia coli, Micrococcus luteus, or Beauveria bassiana. Recombinant OfsPLA_(2) significantly induced prophenoloxidase (PPO) activation in larval hemolymph in the presence of Ca^(2+) and encapsulation of agarose beads. Injection of recombinant OfsPLA_(2) into larvae resulted in increased transcript levels of attacin, defencin, and moricin-3 genes. Our results demonstrate the involvement of the eicosanoid signaling pathway in the innate immune response of O. furnacalis larvae and provide new information about the roles of O. furnacalis secretory PLA_(2) in activating PPO and antimicrobial peptide production.

关键词： eicosanoid signal pathway innate immune response Ostrinia furnacalis phospholipase A_(2)(PLA_(2))

Literature review on waste management of online food delivery industry in China

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Chinese Journal of Population,Resources and Environment 2023年第3期21卷 197-202页

作者： Wang sha College of Business Administration Chongqing Three Gorges UniversityChongqing404020China

Meituan Waimai,which was officially launched in November 2013,has created a huge market for food delivery in *** years of development,China’s online food delivery market reached RMB 664.62 billion in *** 2022,Meituan Waimai and ***,two food delivery platforms,have created a duopoly in China’s food delivery *** to the success of the food delivery industry,a significant amount of food delivery packaging waste has caused far-reaching *** literature review primarily organizes the research on the impact of online food delivery packaging from the perspective of environmental *** uses the criterion layer index of online food delivery waste management ecosystem to analyze the impact of the government,environmental non-governmental organizations(NGOs),garbage recycling processors,consumers,online food delivery platforms,takeaway merchants,and takeaway packaging *** review shows that scholars generally believe that takeaway waste management is a complex process involving multiple *** implementation of policies at the government level is inadequate,and studies at the environmental NGO level are *** the consumer level,more environmental awareness education is *** food delivery platforms and takeaway merchants should assume greater corporate social responsibility,and manufacturers of takeaway packaging need prioritize the substitution of environmentally friendly *** is a consensus that paper-made and recyclable packaging boxes are more environmentally friendly than degradable packaging,which is not as environmentally friendly as is commonly *** academia and the industry have conducted various studies and pilot projects on recyclable *** all levels cooperate well,this will be an effective way to manage takeaway packaging *** last,we propose the following assumptions for future research:Besides environmental hazards,takeaway garbage has caused direct or indirect phys

关键词： Online food delivery Takeaway industry Takeaway packaging waste Recyclable packaging Recyclable meal box Environmental protection