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提取冶金原理第1卷冶金原理

Cosmic Transmutation Conjecture

1978年

作者：（美）f·哈伯斯

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Journal of Modern Physics 2011年第8期2卷 803-811页

作者： Pedro f. González-Daz Iff CSIC Serrano 121 28006 Madrid

This paper analyzes the big trip phenomenon, restricting it to happen only in the context of the multiverse when the involved wormhole is asymptotically flat and recent criticisms are pointless. A new kind of Lorentzian asymptotically anti-de Sitter wormholes is considered in some detail and it is seen that such wormholes cannot contribute the big trip phenomenon. The ideas of big trip, multiverse and Boltzmann brains are then used to advance the conjecture of cosmic transmutation according to which the host universe where one of the mouths of a grown up wormhole is inserted may be converted into a universe similar to the traveling one if the latter contains a civilization which is typical also in the host universe. The origin of life in the context of the multiverse is then briefly discussed.

关键词： Big Trip Multiverse Boltzmann Brains Transmutation

On the Use of Benford’s Law to Detect JPEG Biometric Data Tampering

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Journal of Information Security 2017年第3期8卷 240-256页

作者： Iorliam Aamo Shangbum f. Caleb Department of Mathematics/Computer Science Benue State University Makurdi Nigeria Department of Computer Science Nigerian Army Institute of Technology & Environmental Studies Makurdi Nigeria

Tampering of biometric data has attracted a great deal of attention recently. furthermore, there could be an intentional or accidental use of a particular biometric sample instead of another for a particular application. Therefore, there exists a need to propose a method to detect data tampering, as well as differentiate biometric samples in cases of intentional or accidental use for a different application. In this paper, fingerprint image tampering is studied. furthermore, optically acquired fingerprints, synthetically generated fingerprints and contact-less acquired fingerprints are studied for separation purposes using the Benford’s law divergence metric. Benford’s law has shown in literature to be very effective in detecting tampering of natural images. In this paper, the Benford’s law features with support vector machine are proposed for the detection of malicious tampering of JPEG fingerprint images. This method is aimed at protecting against insider attackers and hackers. This proposed method detected tampering effectively, with Equal Error Rate (EER) of 2.08%. Again, the experimental results illustrate that, optically acquired fingerprints, synthetically generated fingerprints and contact-less acquired fingerprints can be separated by the proposed method effectively.

关键词： Benford’s Law fingerprints JPEG Coefficients Tampering

New WA-system of kravchenko functions in digital signal processing

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Journal of Measurement Science and Instrumentation 2012年第4期3卷 345-351页

作者： V f Kravchenko D V Churikov Kotel'nikov Institute of Radio Engineering and Electronics Russian Academy of Sciences

On the basis of modified atomic transformations the new WA-systems of Kravchenko functions are *** an example the digital processing of time series of the various physical nature processing is *** numerical experiment... 详细信息

关键词： atomic functions WA-systems of functions wavelets digital signal processing(DSP)

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爵士乐时代的故事

Chemo-mechanical couplings in compacted argillite submitted to high-pH environment

2017年

作者： (美)f. S.菲茨杰拉德

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Journal of Rock Mechanics and Geotechnical Engineering 2010年第4期2卷 314-320页

作者： O. Cuisinier f. Masrouri LAEGO Nancy Université

In the french concept of deep nuclear wastes repository, the galleries should be backfilled with excavated argillite after the site exploitation period. After several thousands of years, the degradation of the concrete lining of the galleries will generate alkaline fluid (pH > 12) that will diffuse through the backfill. The objective of the paper is to describe the influence of such solute diffusion on the microstructure and the mechanical behavior of compacted argillite. Saturated-portlandite water was circulated through compacted samples for 3, 6 and 12 months at 20 °C or 60 °C, respectively. The microstructures before and after fluid circulation were determined with mercury intrusion porosimetry. Since it was planned to introduce additives (bentonite or lime) in the remoulded argillite to backfill the deep galleries, such mixtures were also studied. The results show that the influence of the alkaline fluid on the properties of the argillite is a function of the nature of the additive. The pure argillite undergoes slight modifications that can be related to a limited dissolution of its clayey particles. Conversely, intense alteration of the bentonite-argillite mixture was observed. Lime addition improves the mechanical characteristics of the argillite through the precipitation of cementitious compounds.

关键词： chemo-mechanical couplings alkaline plume argillite microstructure shear strength

Evaluation of Best Management Practices in Millsboro Pond Watershed Using Soil and Water Assessment Tool (SWAT) Model

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Journal of Water Resource and Protection 2010年第5期2卷 403-412页

作者： Aditya Sood William f. Ritter 不详

The Inland Bays in southern Delaware (USA) are facing eutrophication due to the nutrient loading from its watershed. The source of nutrients in the watershed is predominantly agriculture. The Millsboro Pond, a sub-watershed within the Inland Bays basin, was modeled using the Soil and Water Assessment Tool (SWAT) model. It was found that the contribution of ground water from outside the watershed had a signifi-cant impact on the hydrology of the region. Once the model was calibrated and validated, five management scenarios were implemented, one at a time, to measure its effectiveness in reducing the nutrient loading in the watershed. Among the Best Management Practices (BMPs), planting winter cover crops on the agricul-ture land was the most effective method in reducing the nutrient loads. The second most effective method was to provide grassland riparian zones. The BMPs alone were not able to achieve the nutrient load reduc-tion as required by the Total Maximum Daily Loads (TMDLs). Two extra scenarios that involved in replac-ing agriculture land with forest, first with deciduous trees and then with high yielding trees were considered. It is suggested that to achieve the required TMDL for the watershed, some parts of the agricultural land may have to be effectively converted into the managed forest with some high yielding trees such as hybrid poplar trees providing cellulose raw material for bio fuels. The remaining agriculture land should take up the prac-tice of planting winter cover crops and better nutrient management. Riparian zones, either in form of forest or grasslands, should be the final line of defense for reducing nutrient loading in the watershed.

关键词： Watershed BMPs Modelling SWAT

分布反馈和螺旋反馈气体激光器的增益饱和效应

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红外研究 1989年第2期8卷 81-88页

作者： J.Arnesson 崔大复 S.Gnepf f.K.Kneubühl Institute of Quantum Electronics ETH CH-8093 ZurichSwitzerland

非线性增益饱和使分布反馈(DfB)和螺旋反馈(HfB)气体激光器的纵模最大峰值强度远离阻带.该阻带是由波导的折射率周期调制或截面周期调制引起的.我们用光泵DfB和HfB496μm CH_3f远红外激光器首次从实验上证实了理论预言的这种现象.

关键词：分布反馈气体激光器非线性增益

Developing a framework to Measure Watershed Sustainability by Using Hydrological/Water Quality Model

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Journal of Water Resource and Protection 2011年第11期3卷 788-804页

作者： Aditya Sood William f. Ritter 不详

A framework is built, wherein hydrological/water quality model is used to measure watershed sustainability. for this framework, watershed sustainability has been defined and quantified by defining social, environmental and biodiversity indicators. By providing weightage to these indicators, a “River Basin Sustainability Index” is built. The watershed sustainability is then calculated based on the concepts of reliability, resilience and vulnerability. The framework is then applied to a case study, where, based on watershed management principles, four land use scenarios are created in GIS. The Soil and Water Assessment Tool (SWAT) is used as a hydrology/water quality model. Based on the results the land uses are ranked for sustainability and policy implications have been discussed. This results show that landuse (both type and location) impact watershed sustainability. The existing land use is weak in environmental sustainability. Also, riparian zones play a critical role in watershed sustainability, although beyond certain width their contribution is not significant.

关键词： Sustainability Development framework Watershed Resilience Reliability Vulnerability Hydrological Models Application Landuse