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High-throughput reaction engineering to assess the oxidation stability of MAX phases

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npj Computational Materials 2021年第1期7卷 20-32页

作者： D.Sauceda P.Singh A.R.Falkowski Y.Chen t.Doung G.Vazquez M.Radovic R.Arroyave Department of Materials Science & Engineering Texas A&M UniversityCollege StationTX 77843USA Department of Mechanical Engineering Texas A&M UniversityCollege StationTX 77843USA Ames Laboratory US Department of EnergyIowa State UniversityAmesIA50011USA

the resistance to oxidizing environments exhibited by some Mn+1AXn(MAX)phases stems from the formation of stable and protective oxide layers at high operating *** MAX phases are hexagonally arranged layered nitrides or carbides with general formula M_(n+1)AX_(n),n=1,2,3,where M is early transition elements,A is A block elements,and X is C/*** attempts to model and assess oxide phase stability in these systems has been limited in scope due to higher computational *** address the issue,we developed a machine-learning driven high-throughput framework for the fast assessment of phase stability and oxygen reactivity of 211 chemistry MAX phase M_(2)*** proposed scheme combines a sure independence screening sparsifying operator-based machine-learning model in combination with grand-canonical linear programming to assess temperaturedependent Gibbs free energies,reaction products,and elemental chemical activity during the oxidation of MAX *** thermodynamic stability,and chemical activity of constituent elements of ti_(2)AlC with respect to oxygen were fully assessed to understand the high-temperature oxidation *** predictions are in good agreement with oxidation experiments performed on ti_(2)*** were also able to explain the metastability of ti_(2)SiC,which could not be synthesized experimentally due to higher stability of competing *** generality of the proposed approach,we discuss the oxidation mechanism of Cr_(2)*** insights of oxidation behavior will enable more efficient design and accelerated discovery of MAX phases with maintained performance in oxidizing environments at high temperatures。

关键词： stability MAX maintained

GAS PERMEABILItY OF COPOLY(1-tRIMEtHYL-SILYL-1-PROPYNE-PENtAMEtHYL-DISILYL-1-PROPYNE) MEMBRANE

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Chinese Journal of Polymer Science 1992年第3期10卷 203-209页

作者：郑国栋 t. Nakagawa A. Higuchi K. Nagai Changchun Institute of Applied Chemistry Academia Sinica Changchun 130022 China Department Industrial Chemistry Faculty of Science and Engineering Meiji University Kawasaki JAPAN

the permeability of copoly (1-trimethylsilyl-1-propyne-pentamethyldisilyl-1-propyne) membrane for twelve gases (0_2, N_2, CO_2, H_2, D_2, He, At, CH_4, C_2H_4, C_2H_6, C_3H_6 and C_3H_8) was examined. the basic laws of solution and diffusion of the gases in the membrane were expounded preliminarily. It was found that a linear relationship between logarithm of diffusion coefficient (D) and critical molar volume (V_c) of the gases. the permeation characteristics of the gases in the copoly (1-trimethylsilyl-1-propyne-pentamethyldisilyl-1-propyne) membrane was also discussed.

关键词： Gas permeability Copoly (1-trimethylsilyl-1-propyne-pentamethyldisilyl-1-propyne), Membrane.

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CO_2捕集过程中有机胺热降解的实验研究

清华大学学报（自然科学版） 2012年第1期52卷 81-86页

作者：周姗王淑娟 Rochelle G t 陈昌和清华大学热能工程系热科学与动力工程教育部重点实验室中国北京100084 德克萨斯大学奥斯汀分校化学工程系美国德克萨斯州奥斯汀78712-0231

在使用有机胺捕集CO2的工艺中,胺的降解性质是评价胺的重要因素之一。该文使用不锈钢密闭反应器和强制对流烘箱,在相同CO2负荷条件下分别考察了乙二胺(EDA)、1,2-二胺基丙烷(MEDA)、2-哌啶乙醇(2-PE)、哌嗪/2-氨基-2-甲基-1-丙醇(PZ/AMP... 详细信息

在使用有机胺捕集CO2的工艺中,胺的降解性质是评价胺的重要因素之一。该文使用不锈钢密闭反应器和强制对流烘箱,在相同CO2负荷条件下分别考察了乙二胺(EDA)、1,2-二胺基丙烷(MEDA)、2-哌啶乙醇(2-PE)、哌嗪/2-氨基-2-甲基-1-丙醇(PZ/AMP)混合溶液在373～423K的热降解过程。除乙二胺外,所有实验的胺类的热降解速率都低于常用的乙醇胺(MEA)的热降解速率。在乙二胺分子上添加空间位阻有助于降低胺的热降解速率。本身具有热稳定结构的胺与其他胺类混合后,其热降解速率可能会提高。

关键词： CO2捕集有机胺热降解

Synthesis, Growth and Material Characterization of Bis L-Alanine triethanol Amine (BLAtEA) Single Crystals Grown by Slow Evaporation technique

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Journal of Minerals and Materials Characterization and Engineering 2011年第10期10卷 959-972页

作者： t. Vela P. Selvarajan t. H. Freeda Department of Physics Aditanar College of Arts and Science Tiruchendur-628216 TamilnaduIndia. Department of Physics S.T. Hindu College Nagercoil-629002 Tamilnadu India. Department of Physics The M.D.T. Hindu College Tirunelveli-627010 Tamilnadu India.

Bis L-alanine triethanol amine (BLAtEA) salt was synthesized by solution method and it was subjected to solubility studies. Using the solubility data, the saturated solution of the synthesized salt was prepared and single crystals of Bis L-alanine triethanol amine (BLAtEA) were grown from aqueous solution by slow evaporation technique. X-ray diffraction (XRD) study was carried out to confirm the crystal structure. FtIR study reveals the functional groups of the sample. UV-Visible transmittance and absorption spectra were recorded for the sample to analyze the transparency of the grown crystal. Vickers micro hardness values were measured for the sample and from the microhardness study it is observed that BLAtEA crystal is a soft material. SHG generation study was carried out to confirm the NLO activity of grown sample and also BLAtEA crystal has been analyzed with dielectric

关键词： NLO crystal Crystal growth Single crystal Characterization XRD FtIR microhardness dielectric constant activation energy

A field study of a roof bolter canopy air curtain(2nd generation)for respirable coal mine dust control

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International Journal of Mining Science and technology 2019年第5期29卷 711-720页

作者： W.R.Reed S.Klima M.Shahan G.J.H.Ross K.Singh R.Cross t.Grounds CDC NIOSH Pittsburgh Mining Research DivisionPittsburghPA 15236USA Fletcher&Co. HuntingtonWV 25705USA Prairie State Generating Company LLC Lively GroveIL 62257USA

A 2nd generation roof bolter canopy air curtain(CAC)design was tested by National Institute for Occupational Safety and Health(NIOSH)at a Midwestern underground coal *** the study,the roof bolter never operated downwind of the continuous *** a combination of personal Data Rams(pDR)and gravimetric samplers,the dust control efficiency of the roof bolter CAC was *** evaluation was determined using three methods:(1)comparing roof bolter operator concentrations underneath the CAC to roof bolter concentrations outside the CAC,(2)comparing roof bolter operator concentrations underneath the CAC to the concentrations at the rear of the bolter,and finally,(3)using the gravimetric data directly underneath the CAC to correct roof bolter operator concentrations underneath the CAC and comparing them to the concentrations at the rear of the *** 1 dust control efficiencies ranged from 53.9%to 60.4%.Method 2 efficiencies ranged from 150.5%to 52.2%,and Method 3 efficiencies ranged from 40.7%to 91%.Reasons for negative and low dust control efficiencies are provided in this paper and include:incorrect sampling locations,large distance between CAC and operator,and contamination of intake air from line *** dust concentrations encountered during the testing made it difficult to discern whether differences in concentrations were due to the CAC or due to variances inherent in experimental dust ***,the analyses,especially the Method 3 analysis,show that the CAC can be an effective dust control device.

关键词： Coal Roof bolter Respirable dust Underground mining

基于Modular网络和EM-SFM算法的模糊Sugeno模型(英文)

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控制理论与应用 2001年第3期18卷 333-340页

作者：王士同 J.F.鲍尔蕴 t.马丁华东船舶工业学院计算机系江苏镇江212003 布里斯托尔大学高级计算机研究中心英国布里斯托尔布里斯托尔大学高级计算机研究中心

基于Modular网络重新解释了广为使用的模糊Sugeno模型 .随后 ,基于EM算法 ,提出了该模型的新算法EM SFM ,证明了该算法的线性收敛法 ,分析了它的收敛速度 .

关键词：模糊Sugeno模型 Modular网络收敛 EM-SFM算法人工智能

Dengue-specific serotype related to clinical severity during the 2012/2013 epidemic in centre of Brazil

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Infectious Diseases of Poverty 2017年第1期6卷 1043-1053页

作者： Benigno A.M.Rocha Adriana O.Guilarde Angela F.L.t.Argolo Marianna Peres tassara Lucimeire Ada Silveira Isabela C.Junqueira Marilia D.turchi Valeria C.R.Feres Celina M.t.Martelli Institute of tropical Pathology and Public Health Federal University of GoiasGoianiaBrazil Faculty of Pharmacy Federal University of GoiasGoianiaBrazil School of Nursing State University of GoiasCeresBrazil

Multilingual abstracts:Please see Additional file 1 for translations of the abstract into the five official working languages of the United ***:Currently,in Brazil,there is a co-circulation of the four dengue(DENV-1 to DENV-4)*** study aimed to assess whether different serotypes and antibody response patterns were associated with the severity of the disease during a dengue outbreak,which occurred in 2012/2013 in centre of ***:We conducted a prospective study with 452 patients with laboratory confirmed dengue in central Brazil,from January 2012 to July *** clinical outcome was the severity of cases:dengue,dengue with warning signs,and severe *** patients were evaluated at three different *** sampling for laboratory testing and confirmatory tests for dengue infection were *** performed a multinomial analysis considering the three categories of the dependent variable,as outlined *** odds ratios(ORs)were calculated.A multinomial logistic regression model was applied for variables with a P-valueth StAtA 12.0 ***:Four hundred fifty-two patients(452/632,71.5%)were diagnosed with *** dengue virus(DENV)serotypes were identified in 243 ***-4 was detected in 135 patients(55.6%),DENV-1 in 91(37.4%),DENV-3 in 13(5.3%),and DENV-2 in 4(1.6%).Patients with the DENV-1 serotype were more prone to present with several clinical and laboratory features as compared with DENV-4 patients,including spontaneous bleeding(P=0.03),intense abdominal pain(P=0.004),neurological symptoms(P=0.09),and thrombocytopenia(P=0.01).Secondary infection was more predominant among DENV-4 cases(80.0%)compared with DENV-1 cases(62.3%)(P=0.03).the univariate analysis showed that females(OR=2.12;95%CI:1.44-3.13;Pth warning *** multinomial analysis showed that severe dengue cases with secondary infection had an adjusted OR o

关键词： Dengue Secondary infection Severe dengue Dengue type 4 Brazil

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QUARK MASSES

Chinese Physics C 2016年第10期40卷 653-660页

作者： A.V. Manohar C.t. Sachrajda R.M. Barnett University of California San Diego University of Southampton LBNL

A. Introduction this note discusses some of the theoretical issues relevant for the determination of quark masses, which are fundamental parameters of the Standard Model of particle physics. Unlike the leptons, quarks are confined inside hadrons and are not observed as physical particles. Quark masses therefore cannot be measured directly, but must be determined indirectly through their influence on hadronic properties. Although one often speaks loosely of quark masses as one would of the mass of the electron or muon, any quantitative statement about the value of a quark mass must make careful reference to the particular theoretical framework that is used to define it. It is important to keep this scheme dependence in mind when using the quark mass values tabulated in the data listings.

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Bacterial inclusion bodies function as vehicles for dendritic cell-mediated t cell responses

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Cellular & Molecular Immunology 2020年第4期17卷 415-417页

作者： Sjoerd t.t.Schetters Wouter S.P.Jong Laura J.W.Kruijssen H.B.van den Berg van Saparoea Steef Engels Wendy W.J.Unger Diane Houben Joke M.M.den Haan Joen Luirink Yvette van Kooyk Department of Molecular Cell Biology and Immunology Amsterdam UMCLocation VUmcAmsterdamThe Netherlands Abera Bioscience AB SolnaSweden Laboratory of Pediatrics Division of Pediatric Infectious Diseases and ImmunologyErasmus MC-Sophia Children’s HospitalRotterdamThe Netherlands Department of Molecular Cell Biology Section Molecular MicrobiologyFaculty of ScienceVU UniversityAmsterdamThe Netherlands

Immunogenic antigens for vaccination are often created through the production of recombinant proteins using Escherichia coli.1 As a side product,aggregates called inclusion bodies(IBs)are formed,containing largely misfolded forms of the overexpressed recombinant protein.2 the effect of IBs on the immune system and whether they can be used as effective vaccine products remain *** non-native conformation of proteins upon accumulation in IBs abrogates their use as vaccines aimed at generating high-affinity antibodies.3 However,IBs exhibit unique properties,including mechanical and thermal stability due to their intrinsic particulate nature,biocompatibility,high antigenic content,low toxicity and relative resistance to *** characteristics make IBs attractive as an antigenic vaccine formulation for t cell responses to linear *** IBs can trigger adaptive cellular responses initiated via uptake by dendritic cells for presentation to t cells is unknown.

关键词： vaccine attractive initiated