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Assembly of zinc metallacrowns with an a-amino hydroxamic acid ligand

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Chinese Chemical Letters 2015年第4期26卷 444-448页

作者： Joseph Jankolovits jeff W.Kampf Vincent L.Pecoraro Chemistry Department University of Michigan

In the assembly of metallacrowns for molecular recognition, luminescence, and molecular magnetism applications, substituting the ring ion can have profound effects on the structure, stability, and physical properties of the inorganic macrocycle. The assembly of Zn（ll） metallacrowns with an ,^-amino hydroxamic acid ligand （pheHA） was investigated studied metallacrowns containing Cu（lI） and Ni（I1）. to compare the assembly behavior with the well Electrospray ionization mass spectrometry reveals that the benchmark species Zns（pheHA）42＋ and LnZns（pheHA）s3. assemble in pyridine, which is consistent with the behavior of Cu（II） and Ni（ll）. A LnZn4（pheHA）43. species is also observed in a 1：1 DMF-pyridine mixture. An unprecedented La（III）[16-MCznul）.pn^HA,HpheHA-6]s＋ complex was crystallo- graphically characterized that possesses unusual C2 symmetry. These results provide insights into the design of functional metallacrowns through ring ion substitution.

关键词： MetallacrownSelf-assemblySupramolecular chemistryLanthanide5Zinc

Designs to Improve Capability of Neural Networks to Make Structural Predictions

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Chinese Journal of Polymer Science 2023年第9期41卷 1477-1485,I0009页

作者： Tian-Yao Wang Jian-Feng Li Hong-Dong Zhang jeff Z.Y.Chen Department of Macromolecular Science State Key Laboratory of Macromolecular Engineering of PolymersFudan UniversityShanghai200438China Department of Physics and Astronomy University of WaterlooWaterlooN2L 3G1Canada

A deep neural network model generally consists of different modules that play essential roles in performing a *** optimal design of a module for use in modeling a physical problem is directly related to the success of the *** this work,the effectiveness of a number of special modules,the self-attention mechanism for recognizing the importance of molecular sequence information in a polymer,as well as the big-stride representation and conditional random field for enhancing the network ability to produce desired local configurations,is numerically *** models containing these modules are trained by using the well documented data of the native structures of the HP model and assessed according to their capability in making structural predictions of unseen *** specific network design of self-attention mechanism adopted here is modified from a similar idea in natural language *** big-stride representation module introduced in this work is shown to drastically improve network's capability to model polymer segments of strong lattice position correlations.

关键词： Deep neural network Self-attention mechanism Big-stride representation Conditional random methods

Mandatory IFRS adoption and management forecasts: The impact of enforcement changes

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China Journal of Accounting Research 2019年第1期12卷 33-61页

作者： Zhaoyang Gu jeff Ng Albert Tsang School of Accountancy CUHK Business SchoolThe Chinese University of Hong Kong Schulich School of Business York University

We examine how concurrent enforcement changes affect the positive relationship between mandatory IFRS adoption and firms’ voluntary disclosure. We show that the increase in the issuance of management forecasts after IFRS adoption is smaller for firms from IFRS-mandating countries with concurrent enforcement changes than for those from countries without such changes. We find no difference in the increase of forecast informativeness between firms from IFRS-mandating countries without concurrent enforcement changes and firms from non-IFRS-mandating countries; however, firms domiciled in IFRS-mandating countries with concurrent enforcement changes exhibit a significantly smaller increase in forecast informativeness. Our findings suggest that better IFRS enforcement distinctly weakens (strengthens) the positive effect of IFRS adoption on voluntary (mandatory) disclosure.

关键词： Management forecasts Voluntary disclosure Mandatory IFRS adoption Changes in enforcement Information environment

Investigation of Taylor-Gortler-like Vortices Using the Parallel Consistent Splitting Scheme

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Advances in Applied Mathematics and Mechanics 2009年第6期1卷 799-815页

作者： Yong Hong Kuo Kawi-Lam Wong jeff Chak-Fu Wong The Joint Institute for Computational Sciences University of Tennessee/Oak Ridge National LaboratoryBuilding 5100RM 209Mail Stop 6013Bethel Valley RoadP.O.Box 2008 Oak RidgeTN 37831-6013 Department of Mathematics Room 220Lady Shaw BuildingThe Chinese University of Hong KongShatinHong KongChina

Symmetric Taylor-Gortler-like vortices at Re=3200 and 5000 in 3D rectangular cavities with a moving top lid are studied numerically and tested with a spanwise aspect ratio of 1:1:L,where L=1,2,*** are obtained by solving the momentum equations and the continuity equations using the consistent splitting *** code presented here was ported to the Parallel Interoperable Computational Mechanics System Simulator(PICMSS).Stable solutions are obtained as limit cases of the transients.

关键词： Mixed finite element consistent splitting scheme PICMSS

A Knowledge Graph Based Approach to Social Science Surveys

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Data Intelligence 2021年第4期3卷 477-506页

作者： jeff Z.Pan Elspeth Edelstein Patrik Bansky Adam Wyner School of Informatics University of EdinburghEdinburgh EH89YLUK Department of Computing Science University of AberdeenAberdeen AB243FXUK School of Language LiteratureMusic and Visual CultureUniversity of AberdeenAberdeen AB243FXUK School of Law and Department of Computer Science Swansea UniversitySwanseaWest Glamorgan SA28PPUK

Recent success of knowledge graphs has spurred interest in applying them in open science,such as on intelligent survey systems for ***,efforts to understand the quality of candidate survey questions provided by these methods have been ***,existing methods do not consider the type of on-the-fly content planning that is possible for face-to-face surveys and hence do not guarantee that selection of subsequent questions is based on response to previous questions in a *** address this limitation,we propose a dynamic and informative solution for an intelligent survey system that is based on knowledge *** illustrate our proposal,we look into social science surveys,focusing on ordering the questions of a questionnaire component by their level of acceptance,along with conditional triggers that further customise participants’*** main findings are:(i)evaluation of the proposed approach shows that the dynamic component can be beneficial in terms of lowering the number of questions asked per variable,thus allowing more informative data to be collected in a survey of equivalent length;and(ii)a primary advantage of the proposed approach is that it enables grouping of participants according to their responses,so that participants are not only served appropriate follow-up questions,but their responses to these questions may be analysed in the context of some initial *** believe that the proposed approach can easily be applied to other social science surveys based on grouping definitions in their *** knowledge-graph-based intelligent survey approach proposed in our work allows online questionnaires to approach face-to-face interaction in their level of informativity and responsiveness,as well as duplicating certain advantages of interview-based data collection.

关键词： Intelligent survey system Dynamic and informative system Knowledge graph Linguistic grammaticality judgements

Tayloring cell populations for neurodegenerative diseases

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Neural Regeneration Research 2016年第10期11卷 1582-1583页

作者： jeff m.fortin loic p.deleyrolle brent a.reynolds Lillian S.Wells Department of Neurosurgery University of FloridaGainesvilleFLUSA PrestonA.Wells Jr.for Brain Tumor TherapyUniversity of FloridaGainesvilleFLUSA

Neurological disorders are increasing in prevalence world- wide, and interest in stem cell therapies for these amictions has increased over the past two decades. While many neu- rological injuries are too devastating for the repair capabil- ities of endogenous neural stem cells （NSCs） an alternative is to harvest stem cells from a donor and grow them in vitro, to be used later as a donor source for transplantation. Many research groups have already done this, first using animal models and now using clinical trial participants. Despite the regular flow of publications about cell replace- ment therapies for central nervous system （CNS） disorders, there is still a scarcity of clinically-relevant reports of effi- cacy. The capability of donor cells to undergo ample site-di- rected differentiation and functional integration seems to be lacking （Andressen, 2013）. So, while stem cells do have properties that are suited for repair of the injured CNS, a primary remaining question is how these cells can best be grafted to produce long-term functional benefit to the host environment. Moreover, among the challenges in neural cell transplantation is controlling the ultimate characteris- tics of grafted cells, pertaining to their survival, phenotypes and performance.

关键词： cell Tayloring cell populations for neurodegenerative diseases

Post-mining policies and practices in the Eastern USA coal region

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International Journal of Coal Science & Technology 2014年第2期1卷 135-151页

作者： jeff Skousen Carl E.Zipper West Virginia University MorgantownWV 26506USA Virginia Polytechnic Institute and State University BlacksburgVA 24061USA

Surface coal mines prior to 1950 in the USA were generally left without any *** government regulations advanced since then,mine operators were required to backfill the area and plant grasses or *** the federal Surface Mining Control and Reclamation Act(SMCRA)was passed in 1977 in the USA,mine operators were required to conduct pre-mining analyses of the site and to designate a land use that could be achieved after *** reclamation,as needed to satisfy today’s societal demands,requires engineering,design,and purposeful reconstruction of the full mining disturbance,not just its surface,and control of waters leaving the mine *** reclamation on modern American coal mines is fully integrated with the mining operation.A suitable and effective postmining land use that is sustainable for future generations is crucial to the long-term success and profitability of the mining business and to the future economic benefits of the *** post-mining land uses in the USA are:(1)prime farmland,(2)hay land and pasture,(3)biofuel crops,(4)forestry,(5)wildlife habitat,and(6)building site *** and regulations for each post-mining land use were developed and practices to achieve successful and sustainable land uses were ***-mining conditions should provide ecosystem services and produce lands capable of supporting societal needs in the future.

关键词： Biofuel Commercial development Laws and regulations Pasture Prime farmland Reforestation Water quality Wildlife habitat

A TV-Based Iterative Regularization Method for the Solutions of Thermal Convection Problems

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Communications in Computational Physics 2013年第9期14卷 1120-1146页

作者： Eric T.Chung jeff C.-F.Wong Department of Mathematics Lady Shaw BuildingThe Chinese University of Hong KongShatinHong Kong

Linear/nonlinear and Stokes based-stabilizations for the filter equations for damping out primitive variable(PV)solutions corrupted by uniformly distributed randomnoises are numerically studied through the natural convection(NC)aswell as the mixed convection(MC)*** most recognizable filter-scheme is based on a combination of the negative Laplace equation multiplied with the selection of the spatial scale and a linear function in order to preserve the uniqueness of the filtered solution.A more complicated filter-scheme,based on a Stokes problem which couples a filtered velocity and a filtered(artificial)pressure(or Lagrange multiplier)in order to enforce the incompressibility constraint,is also *** and Stokes basedfilters via nested iterative(NI)filters and the consistent splitting scheme(CSS)are proposed for the NC/MC *** by the total-variation(TV)model of image diffusion,well preserved feature flow patterns from the corrupted NC/MC environment are obtained by TV-Stokes based-filters together with the *** experimental results show that our proposed algorithms are effective and efficient in eliminating the unwanted spurious oscillations and preserving the accuracy of thermal convective fluid flows.

关键词： Linear/nonlinear differential filter Stokes differential filters Leray-alpha model total-variation regularization

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Diary of a wimpy kid

Diary of a wimpy kid