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DEM speedup: Stiffness effects on behavior of bulk material

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Particuology 2014年第1期12卷 107-112页

作者： stef Lommen Dingena Schott Gabriel Lodewijks Department of Maritime and Transport Technology Delft University of Technology

A number of techniques exist for minimizing the computational cost of discrete element simulations （DEMs）. One such method is a reduction of particle stiffness, which allows for bigger time steps and therefore fewer iterations in a simulation. however, the limits and drawbacks of this approach are still unclear, and may lead to invalid results. This paper investigates the effect of a stiffness reduction on bulk behavior by examining three case studies. Two cases demonstrate that particle stiffness can be reduced without affecting the bulk material behavior, whereas the third test shows that a stiffness reduction influences the bulk behavior.

关键词： Discrete element methodSpeedupStiffness reductionLimitOverlap

Respond to the New Accounting Standards,International Taxation Rules and Business Models

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Belt and Road Initiative Tax journal 2023年第1期4卷 82-93页

作者： stef van Weeghel jessica Ma PwC PwC hong Kong China

This article discusses some major changes and developments in ac-counting standards(*** 15 and IFRS 16)and international taxation rules(*** Two-Pillar solution under BEPS 2.0)and new business models(*** and Non-Fungible Tokens)which may have significant impact on taxpayers and pose challenges to tax administrations on how to provide tax certainty and better taxpayer *** article briefly analyses the impact of these developments on taxpayers and makes suggestions for tax policymakers and tax administrations in the Belt *** Road jurisdictions.

关键词： Accounting standards BEPS 2.0 Crypto assets

Raising Tax Certainty in Cross-Border Tax Disputes Through a Body of Experts

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Belt and Road Initiative Tax journal 2022年第2期3卷 64-73页

作者： stef van Weeghel Błażej Kuźniacki International Tax Law University of Amsterdam Global PwC

In this article,we draw attention to raising tax certainty in cross-border tax disputes through a body of experts(BoE).Establishing and developing of a BoE on a non-legally binding basis to help prevent and resolve cross-border tax disputes aims to facilitate harmony in the dynamically evolving international tax ***,hopefully,elevates Confucius’everyday wisdom of“harmony is precious”to the global tax arena.

关键词： Tax certainty Dispute resolution Body of experts Policy goal

Useful predictions ahead of large earthquakes and lessons learned for future progress

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Geodesy and Geodynamics 2020年第1期11卷 1-17页

作者： Ragnar stefansson University of Akureyri IS 600AkureyriIceland

A significant basis for this article is the outcome of 4 multinational research projects which were carried out in South-West Iceland from 1988-2006,focusing on crustal processes that preceded two magnitude-6.6 earthquakes in june *** seismic activity that preceded a magnitude 6.3 double-earthquake in the same seismic zone in 2008 is also significant,as well as other research work which helps to understand how observable crustal processes lead to earthquakes.A significant outcome is that it cannot be assumed that any two earthquakes have the same precursory ***,statistical analysis of precursors of past earthquakes is of limited value for predicting future *** the other hand,with highly sensitive seismic monitoring it is possible to observe the nucleation process for each specific large earthquake for long enough time for earth-realistic modeling of it and extrapolating towards the earthquake in time and *** the Iceland crust,with its fluid-rock interactions,pre-earthquake activity on a scale of years is *** allows a long-term approach to *** apply historical information and sensor-based data to find probable sources of earthquake *** monitor the nucleation process for a possibly impending earthquake at these sources,and then model the process to find its governing factors and extrapolate those in time and space,aiming towards finding hypocenter,fault-size,impact,and time of the impending *** refine our models by predicting frequent medium-sized earthquakes and compare the predictions with *** predict how the possibly impending large earthquake would trigger earthquakes at other *** the complexity of the crust,we must take all observed changes into account when developing models of pre-earthquake *** development of a continuously operating geo-watching system is discussed to link scientific evaluations to warnings that can be used by emergency authorities.

关键词： Earthquake prediction Up-flow of high pressure fluids Fluid-strain model Geo-watching system for warnings

Intelligent tools and techniques for modern management

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Chinese Business Review 2009年第2期8卷 46-54页

作者： Andy stefǎnescu Laura stefǎnescu Ion Liviu Ciora Faculty of Economics and Business Administration University of Craiova Craiova 200207 Romania Financial Accounting Management Faculty of Craiova Spiru Haret University Craiova 200585 Romania

Dietary, physical activity, and weight management interventions among active-duty military personnel: a systematic review

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Military Medical Research 2019年第3期6卷 242-253页

作者： Ahmad MMalkawi Ree MMeertens stef PjKremers Ester FCSleddens Department of health Promotion School of Nutrition andTranslational Research in Metabolism(NUTRIM)Maastricht UniversityMedical Center+PO Box616Maastricht6200MDthe Netherlands Department of health Promotion School of Nutrition andTranslational Research in Metabolism(NUTRIM)and Care and PublicHealth Research Institute(CAPHRI)Maastricht University MedicalCenter+PO Box616Maastricht6200MDthe Netherlands.

Background: Research has been conducted to assess the effectiveness of weight management, dietary and physical activity interventions in military settings. however, a recent and comprehensive overview is lacking. The aim of this systematic review is to examine the evidence and describe key components of effective interventions in terms of improving body composition, dietary behaviors, and physical activity among active-duty military ***: Pub Med, Psyc Info, and CINAhL were searched on the 17 th of November 2017 to identify interventions that promoted diet and/or physical activity among active-duty military personnel. Studies were included if they assessed outcomes related to anthropometric measurements, dietary behaviors, or fitness/physical activity levels. There were no restrictions regarding publication date, follow-up duration, and sex. After screening, a total of 136 studies were eligible. Of these studies, 38 included an educational and/or behavioral change component, and 98 had only physical or fitness training as part of basic military training. Only studies that included an educational and/or behavioral change component were assessed for quality using the Effective Public health Practice Project tool and included in the qualitative synthesis of the ***: Based on consistent evidence from studies that were rated as moderate or strong, there is good evidence that military weight management interventions are effective in improving body composition for durations of up to 12 months. Effective interventions are more likely to be high intensity(have a greater number of sessions), are more often delivered by specialists, and use theoretical base/behavioral change techniques and a standardized guideline. Dietary interventions can potentially reduce total fat and saturated fat intake. Dietary interventions that target the kitchen staff and/or increase the availability of healthy food are more likely to be effective in the short term. The resu

关键词： Dietary Physical activity Weight loss Interventions Military Systematic review

Tax Policies and Measures to Tackle the Impact of COVID-19 in BRI jurisdictions and Related Challenges

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Belt and Road Initiative Tax journal 2020年第1期1卷 72-79页

作者： stef van Weeghel Long Ma jessica Ma PwC PwC China National Tax Policy Services PwC hong Kong China

The COVID-19 pandemic has presented significant challenges to businesses and households around the *** response to the outbreak of the pandemic,governments are using tax policies and tax administrative measures to alleviate corporates and individuals from cash flow *** article summarizes the tax policy measures taken by a few BRI jurisdictions,provides an overview of the cross-border issues arising from exceptional and temporary work location changes due to the pandemic and briefly discusses the challenges faced by governments and corporates and how tax can play a role to deal with these challenges.

关键词： COVID-19 Tax measures BRI jurisdictions Cross-border tax issue Role of taxation

比较硅胶为基质的C18和C8hPLC柱以辅助色谱柱选择

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国外分析仪器技术与应用 1996年第3期 52-57页

作者： stef.,Rj

作者们开发出一种比较以硅胶为基质的Ｃ１８和Ｃ８柱的方法。这是基于它们对极性和非极性化合物的保留值、对称性和选择性而确定的。在进行比较时，所用的测试样品既反映键合固定相的疏水性也反映出硅胶的活性，作者们把保留数据汇编在... 详细信息

作者们开发出一种比较以硅胶为基质的Ｃ１８和Ｃ８柱的方法。这是基于它们对极性和非极性化合物的保留值、对称性和选择性而确定的。在进行比较时，所用的测试样品既反映键合固定相的疏水性也反映出硅胶的活性，作者们把保留数据汇编在一起，以便易于在选择代替物和代用柱时进行比较。

关键词：液相色谱色谱柱硅胶碳柱

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益生菌对青年蛋鸡生长性能的影响

饲料工业 2014年第3期35卷 39-41页

作者： stef De Smat 肖建根黄广明(校) 罗正(校) 建明工业(欧洲)有限公司建明工业(珠海)有限公司广东珠海519040

蛋鸡产蛋性能与很多因素相关,其中最重要的就是鸡群开产前的体重。高质量的青年鸡需要开产前体重达到或者超过品种设定的标准。但是在青年母鸡培育过程中经常会因为肠道梭菌等问题使鸡群的体重偏低,发育不良,导致后期生产性能下降。位... 详细信息

蛋鸡产蛋性能与很多因素相关,其中最重要的就是鸡群开产前的体重。高质量的青年鸡需要开产前体重达到或者超过品种设定的标准。但是在青年母鸡培育过程中经常会因为肠道梭菌等问题使鸡群的体重偏低,发育不良,导致后期生产性能下降。位于荷兰的一家企业(het Anker公司)遇到了这样的问题。为解决该问题,该公司用益生菌(克洛生TM)来改善鸡群健康,试验共使用了62群鸡,31群空白对照,31群益生菌组,进行了近一年的试验,结果表明益生菌可以明显提高青年蛋鸡的平均体重,比该公司的蛋鸡12周龄标准体重高32 g/只,比空白对照组鸡群高19 g/只。不仅如此,克洛生还能提高鸡群的均匀度,为后期的高产打下良好基础。

关键词：蛋鸡青年鸡益生菌体重