33,455 research outputs found
Iterative regularization for learning with convex loss functions
No full textWe consider the problem of supervised learning with convex loss functions and propose a new form of iterative regularization based on the subgradient method. Unlike other regularization approaches, in iterative regularization no constraint or penalization is considered, and generalization is achieved by (early) stopping an empirical iteration. We consider a nonparametric setting, in the framework of reproducing kernel Hilbert spaces, and prove consistency and finite sample bounds on the excess risk under general regularity conditions. Our study provides a new class of efficient regularized learning algorithms and gives insights on the interplay between statistics and optimization in machine learning. ©2016 Junhong Lin, Lorenzo Rosasco and Ding-Xuan Zhou
Bronze cauldron (ding), Zhou dynasty
No full textThis large ding (cauldron with two ears on tripod) belonged to the shanfu (officer of the imperial banqueting court) called Ke, in the reign of Emperor Li of the Western Zhou dynasty. The inner surface carries an inscription of 290 characters. It was excavated in 1890 at Ren village, near Famen temple, Fufeng county, Shaanxi. -- Zhou dynasty, h: 93.1 cm
Mesonemoura aberransterga Du and Zhou 2007
No full textMesonemoura aberransterga Du and Zhou, 2007 Mesonemoura aberransterga Du and Zhou, 2007. Zootaxa. 1495: 47. Type locality: Sichuan Province (from Daocheng County to Xiangcheng County). Distribution. China (Sichuan).Published as part of Li, Weihai & Yang, Ding, 2009, A new species of the genus Mesonemoura (Plecoptera: Nemouridae) and a key to the males of species known from China, pp. 62-68 in Zootaxa 2231 on page 63, DOI: 10.5281/zenodo.19029
Counteracting loneliness: on the restorative function of nostalgia
No full textFour studies tested whether nostalgia can counteract reductions in perceived social support caused by loneliness. Loneliness reduced perceptions of social support but increased nostalgia. Nostalgia, in turn, increased perceptions of social support. Thus, loneliness affected perceived social support in two distinct ways. Whereas the direct effect of loneliness was to reduce perceived social support, the indirect effect of loneliness was to increase perceived social support via nostalgia. This restorative function of nostalgia was particularly apparent among resilient persons. Nostalgia is a psychological resource that protects and fosters mental health
Revisiting the "Irtish tectonic belt": Implications for the Paleozoic tectonic evolution of the Altai orogen
No full textAbstract not availableChuan-Lin Zhang, M. Santosh, Hai-Bo Zou, Yi-Gang Xu, Gang Zhou, Yong-Guan Dong, Ru-Fu Ding, Hong-Yan Wan
Le Shan ding : un vase en bronze inscrit de l'époque des Zhou occidentaux (1050-771 av. notre ère)
No full textVenture Olivier. Le Shan ding : un vase en bronze inscrit de l'époque des Zhou occidentaux (1050-771 av. notre ère). In: Arts asiatiques, tome 59, 2004. pp. 166-172
Nomenclature and taxonomy of Terarista fujiana (Diptera: Psilidae)
No full textZhou, Jiale, Evenhuis, Neal L., Yang, Ding (2022): Nomenclature and taxonomy of Terarista fujiana (Diptera: Psilidae). Zootaxa 5168 (4): 464-470, DOI: https://doi.org/10.11646/zootaxa.5168.4.
Zhou li zheng yi
No full text"Zhou li" yuan ming "Zhou guan". shi ni ding Zhou dai guan zhi de zhu zuo, bei feng wei ru jia jing dian zhi yi, nei rong fen tian guan, di guan, chun guan, xia guan, qiu guan, dong guan liu da bu fen, qi zhong dong guan yu han chu wang yi, bu zhi yi "Kao gong ji". "Zhou li zheng yi" shi Qing dai zhu ming xue zhe Sun Yirang zai Han dai Zheng Xuan zhu, Tang dai Jia Gongyan shu de ji chu shang dui "Zhou li" ia yi kao zheng shu jie zhi zuo, hu zhong bo cai zhong shuo,zi liao fan fu, kao zheng jing xiang, dui yan du zhou li"yi shu, ji you can kao jia zhi, Ci ci jing guo Wang Shaohua xian sheng dian xiao zheng li, zhi liang geng shang ceng lo
The relationship of the ADP-ribosylating enzyme from S. solfataricus with DING proteins and its intracellular localization
No full textThe PARPSso thermoprotein from Sulfolobus solfataricus has been identified as a PARP-like enzyme that cleaves -NAD+ to synthesize oligomers of ADP-ribose and cross-reacts with polyclonal anti-PARP-1 catalytic site antibodies. Despite the biochemical properties that allow to correlate it to PARP enzymes, the N-terminal and partial amino acid sequence suggest the sulfolobal enzyme belongs to a different class of enzymes, the DING proteins. Considering the high sequence identity with the human DING protein HPBP and the lack of a nucleotide coding sequence in both human and sulfolobal genomes, we hypothesized that PARPSso might share other features with the human DING. Further analysis of PARPSso amino acid sequence addressed the research towards studying other possible similarities between human and sulfolobal protein and then to explain how PARPSso correlates with canonic PARPs. For the latter question, the peculiar behaviour of the thermozyme, that is biochemically, but not structurally related to the classic PARPs, stimulated to investigate by computational analysis and databank, whether the protein might be phylogenetically related to any already known PARP amino acid sequence.
Moreover, immunochemical and enzymatic crossed analyses were performed to establish whether purified HPBP and PARPSso have common immunoreactive and functional behaviour.
The second part of the research was focused on the localization of PARPSso within the sulfolobal cell. Our interest to this item arose from the property of some DING proteins to be membrane bound, suggested to work as membrane transporters. On the other hand, from previous studies, it is known that PARPSso is only partially solubilized from the starting cell homogenate provided by ICMIB (CNR), and the soluble enzyme is strictly associated with DNA. In this thesis work, whole cells collected by centrifugation from culture medium were subjected to a different extraction procedure. This procedure included also experimental conditions used to differentiate between soluble (i.e. cytoplasmic) and insoluble (i.e. membrane-bound) protein fractions. PARPSso and DNA distributions were determined by enzyme assay, immunoblotting and agarose gel electrophoresis. Reciprocal interactions of thermozyme, nucleic acid and membrane lipids were investigated with different techniques and methodologies (nucleoid preparation, fluorescence binding assays, fluorescence microscopy analysis)
Synopsis of Nothybidae (Diptera: Brachycera) from China, with redescription of Nothybus absens Lonsdale & Marshall
No full textZhou, Jiale, Marshall, Stephen A., Yang, Ding (2021): Synopsis of Nothybidae (Diptera: Brachycera) from China, with redescription of Nothybus absens Lonsdale & Marshall. Zootaxa 4926 (2): 201-223, DOI: https://doi.org/10.11646/zootaxa.4926.2.
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