1,199,396 research outputs found
Phoebus 10: A Journal of Art History
No full texttableOfContents: Homage to the Past: The Art of Yin Xiaofeng by Ralph Gabbard and Liu Liu.. pages 5-1
Liu Kang
No full textLiu Kang: Essays on Art and Culture is a testament to the inexorable passion of an artist who knew no boundaries. This collection of essays, which Liu Kang wrote over 44 years, offers an insight into the artist’s myriad interests as well as his contributions as a first generation Nanyang artist and art educator. Translated into English for this volume, Liu Kang’s essays are accompanied by commentaries and photographs of the artist-author and his subjects
New Liu Estimators for the Poisson Regression Model: Method and Application
No full textA new shrinkage estimator for the Poisson model is introduced in this paper. This method is a generalization of the Liu (1993) estimator originally developed for the linear regression model and will be generalised here to be used instead of the classical maximum likelihood (ML) method in the presence of multicollinearity since the mean squared error (MSE) of ML becomes inflated in that situation. Furthermore, this paper derives the optimal value of the shrinkage parameter and based on this value some methods of how the shrinkage parameter should be estimated are suggested. Using Monte Carlo simulation where the MSE and mean absolute error (MAE) are calculated it is shown that when the Liu estimator is applied with these proposed estimators of the shrinkage parameter it always outperforms the ML. Finally, an empirical application has been considered to illustrate the usefulness of the new Liu estimators.Estimation; MSE; MAE; Multicollinearity; Poisson; Liu; Simulation
A Climate Action Plan for LIU Post
No full textTo continue to advance LIU’s sustainability leadership, LIU needs clear policies
to reduce its greenhouse gas emissions. Using national planning tools,
we are constructing a greenhouse gas profile for LIU Post and developing a
range of actions that LIU can follow in future years to reduce emissions. A
Climate Action Plan is the best management platform for achieving tangible
results. Our plan calls for a 50% reduction in carbon emissions by 2035. The
plan tracks emissions related to campus vehicles and heating systems,
electric consumption, commuting patterns, and solid waste. To derive our
carbon reduction plan, we will analyze similar plans at peer institutions, talk
with key university leaders, and examine regional and national trends in
renewable energy production, automobile efficiency standards, and growth
in the electric vehicle market. Research topics include: cultivating campus
stakeholders, assessing LIU’s future capital projects, proposing new campus
energy management practices, reviewing LIPA’s energy infrastructure,
understanding LIU Post’s campus energy generation, conducting a GIS
assessment of campus commuting patterns, analyzing campus solid waste,
recycling, and purchasing practices. In addition, we propose a series of campus
educational and green funding recommendations. It is our hope that LIU
Post will review and adopt this plan in 2017
GreenTech LIU: A Roadmap for a Collaborative, SDG Campus
No full textFor universities, sustainability is an essential literacy for the 21st century. LIU Post’s Center for Sustainability wants faculty and students to have powerful and effective digital tools for bringing sustainability frameworks into classrooms, campus research, and learning experiences. GreenTech LIU (GTLIU) will provide an integrated digital platform for faculty and students to collaborate on global citizenship research and education projects. We believe that global citizenship education (GCE) serves as a center axis that can help to integrate sustainability activities across the LIU Post campus. Sustainability and global citizenship are essential skills for 21st century students, regardless of students’ academic majors
Time-resolved Systems Immunology Reveals a Late Juncture Linked to Fatal COVID-19. Liu et al
No full textSupplemental Tables 1-7 for the paper: Can Liu, Andrew J. Martins, William W. Lau, Nicholas Rachmaninoff, ..., John S. Tsang. (2021). "Time-resolved Systems Immunology Reveals a Late Juncture Linked to Fatal COVID-19." Cell. In Press
Difference based Ridge and Liu type Estimators in Semiparametric Regression Models
No full textWe consider a difference based ridge regression estimator and a Liu type estimator of the regression parameters in the partial linear semiparametric regression model, y = Xβ + f + ε. Both estimators are analysed and compared in the sense of mean-squared error. We consider the case of independent errors with equal variance and give conditions under which the proposed estimators are superior to the unbiased difference based estimation technique. We extend the results to account for heteroscedasticity and autocovariance in the error terms. Finally, we illustrate the performance of these estimators with an application to the determinants of electricity consumption in Germany.Difference based estimator; Differencing estimator, Differencing matrix, Liu estimator, Liu type estimator, Multicollinearity, Ridge regression estimator, Semiparametric model
Origin of the stereoselectivity of the intramolecular 1,2-hydrogen shift in singlet chlorocarbenes. A theoretical study
No full textThe stereochemistry of 1,2-H migration in ethylchlorocarbene (1) and chloromethylchlorocarbene (2) has been studied by ab initio methods. Geometries of the ground and transition states of a conformational equilibrium and the 1,2 rearrangement were optimized at the DFT (B3LYP) and MP2 levels of theory using 6-31G(D) and 6-311+G(D,P) basis sets. Final energies were obtained at the MP4/6-311+G(D,P)//MP2/6-311+G(D,P) level. It has been shown that the equilibrium between cis- and trans-conformers of 1 and 2 is shifted moderately toward the trans-conformer for carbene 1 and strongly toward the cis-conformer in the case of 2. The calculated barriers of rotation about the CC bond in carbene 1 (Delta G double dagger = 2.3 kcal mol(-1)) and 2 (5.3 kcal mol(-1)) are lower than the smallest predicted barriers of the 1,2-H shift (8.0 and 8.5 kcal mol(-1), respectively). In accordance with the Curtin-Hammett principle, kinetic control of stereochemistry of the rearrangement proceeding classically is realized. The predicted preferable formation of the Z-isomer of 1-chloropropene (3) and 1,2-dichloroethylene (4) is in good agreement with the experimental data obtained under conditions of the high-temperature thermolysis of the corresponding diazirines. Electronic factors influencing the relative stability of the cis- and trans-isomers of carbenes 1 and 2 and their transition states for 1,2-H migration are discussed.PT: J; CR: ABELL PJ, 1969, J CHEM THERMODYN, V28, P333 BECKE AD, 1988, PHYS REV A, V38, P3098 BECKE AD, 1993, J CHEM PHYS, V98, P5648 BONNEAN Y, 1996, J AM CHEM SOC, V118, P3829 BONNEAU R, 1989, J AM CHEM SOC, V111, P5973 CRAIG NC, 1971, J PHYS CHEM-US, V75, P1453 CRUMP JW, 1963, J ORG CHEM, V28, P953 DIX EJ, 1993, J AM CHEM SOC, V115, P10424 DIX EJ, 1994, RES CHEM INTERMEDIAT, V20, P149 DIX EJ, 1994, THESIS U ROCHESTER N ELIEL EL, 1994, STEREOCHEMISTRY ORGA EPIOTIS ND, 1974, J AM CHEM SOC, V96, P4075 EVANSECK JD, 1990, J AM CHEM SOC, V112, P9148 EVANSECK JD, 1990, J PHYS CHEM-US, V94, P5518 FREY HM, 1970, J CHEM SOC A, P1916 FRISCH MJ, 1995, GAUSSIAN 94 REVISION JONES WM, 1980, REARRANGEMENT GROUND, P95 JORGENSEN WL, 1973, ORGANIC CHEM BOOK OR LAVILLA JA, 1989, J AM CHEM SOC, V111, P6877 LEE C, 1988, PHYS REV B, V37, P785 LIU MTH, 1974, CAN J CHEM, V52, P246 LIU MTH, 1989, J ORG CHEM, V54, P486 LIU MTH, 1990, J AM CHEM SOC, V112, P3915 LIU MTH, 1994, ACCOUNTS CHEM RES, V27, P287 MCQUARRIE DA, 1973, STATISTICAL THERMODY MOSS RA, 1994, ADV CARBENE CHEM, V1 NICKON A, 1993, ACCOUNTS CHEM RES, V26, P84 NICKON A, 1993, TETRAHEDRON LETT, V34, P1391 PITZER KS, 1954, J AM CHEM SOC, V76, P1493 PROCHAZKA M, 1980, COLLECT CZECH CHEM C, V45, P1388 ROSENBERG MG, 1996, TETRAHEDRON LETT, V37, P3235 SHIN SH, 1996, J AM CHEM SOC, V118, P7626 STORER JW, 1993, J AM CHEM SOC, V115, P10426 TOMIOKA H, 1980, J AM CHEM SOC, V102, P7818 TOMIOKA H, 1984, J CHEM SOC CHEM COMM, P476 TOMIOKA H, 1985, TETRAHEDRON LETT, P1651 TOMIOKA H, 1986, J CHEM SOC CHEM COMM, P693 VOSKO SH, 1980, CAN J PHYS, V58, P1200 WOOD RE, 1941, J AM CHEM SOC, V63, P1650 YAMAMOTO Y, 1970, TETRAHEDRON, V26, P1235 ZEFIROV NS, 1977, TETRAHEDRON, V33, P2719; NR: 41; TC: 17; J9: J PHYS CHEM A; PG: 5; GA: WQ630Source type: Electronic(1
Kinetic and spectroscopic properties of carbene-diazirine ylides
No full textThe formation of a metastable carbene-diazirine ylide (CDY), characterized by an UV absorption spectrum in the range of 270-290 nm and yielding azine by rearrangement, is shown to be a general process in the photolysis of diazirines. However, the yield of formation and the lifetime of CDY greatly depend on the system considered. The decreasing value of the rate constant of the reaction, carbene + diazirine --> CDY, from similar to 10(9) M-1 s(-1) for singlet dialkylcarbenes, Ad: (adamantylidene) and BCN: (bicyclo[3.3.1]non-9-ylidene), to similar to 10(8) M-1 s(-1) for benzylchlorocarbene and to similar to 10(6) M-1 s(-1) for cyclopropyl and phenylchlorocarbenes, reflects the decreasing reactivity of these carbenes. The lifetime of these ylides is determined by the value of the activation energy barrier for their rearrangement to azine, E-a approximate to 15.5 kcal/mol for dialkylcarbenes, approximate to 11.5 kcal/mol fur alkylchlorocarbenes, and <10 kcal/mol for phenylchlorocarbene. This decrease of E-a is related to the strong stabilization of the azine when proceeding from CR2=N-N=CR2 to Ph-CCl=N-N=CCl-Ph. Another mechanism for the formation of azine, by a second-order reaction of the diazo isomer of the diazirine, is clearly identified in the case of photolysis of the BCN(N-2) diazirine.PT: J; CR: BONNEAU R, 1989, J AM CHEM SOC, V111, P5974 BONNEAU R, 1992, J PHOTOCH PHOTOBIO A, V68, P97 BONNEAU R, 1997, PURE APPL CHEM, V69, P979 BONNEAU R, 1998, J PHOTOCH PHOTOBIO A, V116, P9 BRINKER UH, 1998, ADV CARBENE CHEM, V2 DOYLE MP, 1987, J ORG CHEM, V52, P1619 GRAHAM WH, 1965, J AM CHEM SOC, V87, P4396 JACKSON JE, 1988, J AM CHEM SOC, V110, P5595 LIU MTH, 1992, J AM CHEM SOC, V114, P3604 LIU MTH, 1992, J ORG CHEM, V57, P2483 LIU MTH, 1992, J PHOTOCH PHOTOBIO A, V63, P115 LIU MTH, 1994, INT J CHEM KINET, V26, P1179 LIU MTH, 1994, J PHOTOCH PHOTOBIO A, V84, P133 LIU MTH, 1994, RES CHEM INTERMEDIAT, V20, P195 LIUEAU R, 1989, J PHYS CHEM-US, V93, P7300 MERRER DC, 1998, J ORG CHEM, V63, P3010 MOSS RA, 1990, J AM CHEM SOC, V112, P1638 MOSS RA, 1990, J AM CHEM SOC, V112, P5642 OIDA S, 1967, CHEM PHARM BULL, V15, P545 OIDA S, 1968, CHEM PHARM BULL, V16, P654 SHUSTOV GV, 1999, CAN J CHEM, V77, P540 TURRO NJ, 1980, J AM CHEM SOC, V102, P7576; NR: 22; TC: 8; J9: J PHYS CHEM A; PG: 6; GA: 311EYSource type: Electronic(1
Paraxantia Liu & Kang 2009
No full textGenus Paraxantia Liu & Kang, 2009 Paraxantia Liu & Kang, 2009: 37; Kang, Liu & Liu, 2014: 462; Cadena-Castañeda, 2015:410; Wu & Liu, 2021: 118-119. Type species: Paraxantia tibetensis Liu & Kang, 2009 Diagnosis characters. See Liu & Kang (2009) and Wu & Liu (2021).Published as part of Wu, Chao & Liu, Chun-Xiang, 2021, A new species of Paraxantia Liu & Kang (Orthoptera: Tettigoniidae; Phaneropterinae; Vosiini) from China, pp. 440-446 in Zootaxa 5026 (3) on page 441, DOI: 10.11646/zootaxa.5026.3.5, http://zenodo.org/record/529834
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