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  1. No Access

    Article

    Detection and Quantification of Water-Soluble Inorganic Chlorine, Bromine and Iodine by MALDI-MS

    Halogens are elements in soil and water that occur as organic and inorganic species. Studies have shown that inorganic halogens are closely related to animal and plant life. Matrix-assisted laser desorption/io...

    Yi Tong, Zheng-Zheng Liu, Jia-Feng Lu, Hai-Yan Zhang… in Journal of Analysis and Testing (2022)

  2. No Access

    Article

    Regulation of bile acid metabolism-related signaling pathways by gut microbiota in diseases

    Over the past decade, there has been increasing attention on the interaction between microbiota and bile acid metabolism. Bile acids are not only involved in the metabolism of nutrients, but are also important...

    Er-teng Jia, Zhi-yu Liu, Min Pan, Jia-feng Lu… in Journal of Zhejiang University-SCIENCE B (2019)

  3. No Access

    Article

    Notes on nonpure piecewise-Koszul algebras

    Let A = ⊕i≥0 A i be a Noetherian standard graded algebra with finite global dimension, gr ...

    Jia-Feng Lü in Indian Journal of Pure and Applied Mathematics (2015)

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    Article

    Koszul-like algebras and modules

    In this paper, the notion of Koszul-like algebra is introduced; this notion generalizes the notion of Koszul algebra and includes some Artin-Schelter regular algebras of global dimension 5 as special examples. Ba...

    Jia-Feng Lü in Mathematical Notes (2013)

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    Article

    Discrete Koszul Algebras

    Discrete Koszul algebra, another extension of Koszul algebras, is introduced in this paper. The Yoneda algebra of a discrete Koszul algebra is investigated in detail. As an application, we give a...

    Jia-Feng Lü, Miao-Sen Chen in Algebras and Representation Theory (2012)

  6. No Access

    Article

    Notes on δ-Koszul Algebras

    This paper is a continuous work of δ-Koszul algebras, which were first introduced by Green and Marcos in 2005 (see Green and Marcos, Commun Algebra 33(6):1753–1764, 2005). Let

    Jia-Feng Lü in Applied Categorical Structures (2012)

  7. No Access

    Article

    Nonpure piecewise-Koszul algebras

    In this paper, the notions of nonpure piecewise-Koszul algebra and nonpure piecewise-Koszul module are introduced, which are the “nonpure” version of piecewise-Koszul algebras and modules first introduced in [19]...

    Jia-Feng Lü in Indian Journal of Pure and Applied Mathematics (2012)

  8. No Access

    Article

    Weakly Koszul-like modules

    The Koszul-like property for any finitely generated graded modules over a Koszul-like algebra is investigated and the notion of weakly Koszul-like module is introduced. We show that a finitely generated graded mo...

    Pei-Sen Chen, Jia-Feng Lü in Mathematical Notes (2012)

  9. No Access

    Article

    New criteria for λ-Koszul algebras

    The main purpose of this paper is to provide some new criteria for a standard graded algebra A = ⊕ i≥0 A i ...

    Pei-Sen Chen, Jia-Feng Lü in Indian Journal of Pure and Applied Mathematics (2011)

  10. No Access

    Article

    Notes on piecewise-Koszul algebras

    The relationships between piecewise-Koszul algebras and other “Koszul-type” algebras are discussed. The Yoneda-Ext algebra and the dual algebra of a piecewise-Koszul algebra are studied, and a sufficient condi...

    Jia Feng Lü, **ao Lan Yu in Acta Mathematica Sinica, English Series (2011)

  11. No Access

    Article

    (p, λ)-Koszul algebras and modules

    In this paper, the notions of (p, λ)-Koszul algebra and (p, λ)-Koszul module are introduced. Some criteria theorems for a positively graded algebra A to be (p, λ)-Koszul are given. The notion of weakly (p, λ)-Kos...

    Jia-Feng Lü, Zhi-Bing Zhao in Indian Journal of Pure and Applied Mathematics (2010)

  12. No Access

    Article

    Algebras with periodic shifts of ext degrees

    The so-called λ-Koszul algebra and λ-Koszul module are introduced. We give different equivalent descriptions of the λ-Koszul algebra in terms of its minimal graded projective resolution and the Yoneda Ext-algebra...

    Jia-Feng Lü in Mathematical Notes (2009)

  13. No Access

    Article

    On modules with d-Koszul-type submodules

    The so-called weakly d-Koszul-type module is introduced and it turns out that each weakly d-Koszul-type module contains a d-Koszul-type submodule. It is proved that, M ∈ ...

    Jia Feng Lü in Acta Mathematica Sinica, English Series (2009)

  14. No Access

    Article

    Piecewise-Koszul algebras

    It is a small step toward the Koszul-type algebras. The piecewise-Koszul algebras are, in general, a new class of quadratic algebras but not the classical Koszul ones, simultaneously they agree with both the c...

    Jia-feng Lü, Ji-wei He, Di-ming Lu in Science in China Series A: Mathematics (2007)