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  • 我國食品添加劑標準的立法研究

    "民以食為天",食品安全與人民群眾的日常生活息息相關,隨著一系列問題食品的出現,人們對于食品的安全問題越來越擔憂。三鹿奶粉事件引發了社會各界的討論,尤其是對于現行我國食品安全立法的思考?!妒称钒踩ā返某雠_順應了社會發展的要求,然而國家隨后出臺了三聚氰胺的限定含量標準,此舉引起了學術界的廣泛爭議,對于三聚氰胺這樣的非食品添加劑進行限定含量規定是否不妥,是否與現行法律相悖等等?!妒称钒踩ā冯m然出臺了,但是與之相配套的法律體系并未建立,尤其是針對三鹿奶粉事件而出現的一些問題,如關于食品添加劑標準的立法還不夠完善,相關規定缺乏可操作性等,應及時通過立法或司法解釋加以完善。...

    2020-12-06 21:11:24瀏覽:31 食品安全法食品添加劑立法研究thefoodsafetylawadditivesLegislationresearch

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  • Application of FEM Analysis to Braced Excavation

    It is becoming possible to do detailed numerical analyses for the various mechanical behavior of braced excavation by researching and developing the numerical analysis technique such as the finite ele-ment method (FEM).However,the mechanical behavior of braced excavation has not been clanfied fully both in theory and in expedence.Therefore,improving the prediction accuracy during the prior design is very important for making the observational method of braced excavation more effective.In this paper,FEM analyses were performed for a model of braced excavation by using Geotechnical Finite Element Elasto-plastic Analysis Software,GeoFEAS (2D).As the constitutive law of ground,MC-DP model, and Dun-can-Chang model were applied.The results were compared and discussed with that of a site measurement,and the effects of the constitutive law of ground on the analyzed result were verified.For the difference be-tween the results,the reason was investigated by the analyses adjusting the elastic modulus of ground,and the appropriate application of the constitutive law was researched....

    2020-11-22 17:58:37瀏覽:38 numericalAnalysisretainingwallfiniteelementmethod(FEM)constitutivelaw

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  • An Analysis of the Natural State in Leviathan

    in the chapter 13 of Leviathan, by analyzing hnnaan nature, Thomas Hobbes gives out his hypothesis of the Natural state, in which people's lives are guided by law of nature. Without a common power to keep all in awe, the law of nature cannot be observed all the time. Thus long time peace and comfort will never be achieved, and even the security of people cannot be guaranteed. This situation can also be applied to the modem international anarchical society. This paper will make an analogy between the natural state in Leviathan and the modem international society to analyze the reason of international conflicts....

    2020-11-22 17:58:37瀏覽:35 LeviathanlawofnaturenaturalstateInternationalanarchicalsociety.

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  • Fractal Geometry of Particle Aggregates Formed in Calcium Sulfite Slurry

    The solid-liquid separation is an important operation for the regenerated slurry of dual-alkali FGD system, and calcium sulfite could predominate in particle aggregates of the slurry. The settling velocity of calcium sulfite particles is a key parameter for the solid-liquid separation design. However, the settling velocity predicted by Stokes' Law could be suitable only for a spherical aggregate, but not for the irregular one. In this work, fractal geometry was introduced in order to characterize highly irregular geometric shapes. The sizes of calcium sulfite particle aggregates were analyzed using a metallographic phase microscope and image analysis. The results showed that particle aggregate had fractal features. The fractal dimensions could reveal the characteristics of the aggregates' geometry and aggregation process. An exponential relation between the fractal dimension D2 and the particle size l was determined as AμlD2. According to fractal theory, a parameter can be used to modify Stokes settling velocity close to actual settling velocity. The results could be valuable for the design of solid-liquid separation process....

    2020-11-03 10:30:25瀏覽:25 sedimentationfractalgeometrylawdual-alkaliFGD

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  • 中心引力優化算法

    中心引力最優化是一種以物理運動學理論為基礎的新的確定性群體搜索優化算法。在重力場中,物體的移動是由物體間的受力和加速度來制定,并把這種物體間的作用運用于粒子運動中。在中心引力優化算法中,通過加速度的更新來實現目標函數適應值的更新?;谶@種思想,給出一種改進中心引力優化算法,并用幾個典型的例子對算法進行了驗證,結果表明算法是有效的。...

    2020-09-29 10:54:18瀏覽:18 中心引力最優化萬有引力定律粒子最優解Centralforceoptimizationlawofuniversalgravitation

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  • 關于氯乙烯精餾自聚問題的研究

    氯乙烯精餾自聚嚴重影響氯乙烯裝置的正常生產,通過對裝置、設備及工藝指標的對比分析,采取HCL凈化,添加阻聚劑,調整氯乙烯pH值,調整設備及對工藝指標的控制,使精餾自聚問題得到有效控制,延長管道、設備堵塞周期。...

    2020-09-28 16:47:12瀏覽:26 氯乙烯精餾自聚影響因素比較法Vinylchloridepolyinfluencingfactorscomparativelaw

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  • X熒光分析

    X射線熒光分析技術具有分析速度快、檢測元素廣、分析精確度高、操作簡便等優點。它在地質、冶金、陶瓷、化工及科學研究等部門中已成為一種重要的分析手段。文章簡要介紹說明了X熒光分析實驗的原理、儀器和方法,并進行了相關討論。...

    2020-09-25 09:10:57瀏覽:14 X熒光分析探測器莫塞萊定律X-rayfluorescenceAnalysisdetectorlaw

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  • Formation Laws of Inorganic Gas Pools in the Northern Jiangsu Basin

    In the Northern Jiangsu basin there are high pure CO2 gas pools, low condensed oil-containing CO2 gas pools, high condensed oil-containing CO2 gas pools and He-containing natural gas pools, with the d 13Cco2 (PDB) values ranging from - 2.87to - 6.50 3He/4He 3.71×10- 6 to 6.42×10- 6, R/Ra 2.64 to 4.5, 40Ar/36Ar 705 to 734, belonging to typical mantle source inorganic gas pools which are related to young magmatic activity. The gas layers occur in two major reservoir-caprock systems, the terrestrial Meso-Cenozoic clastic rock system and the marine Meso-Palaeozoic carbonate rock-clastic rock system. Controlled by the difference in the scale of traps in the two reservoir-caprock systems, large and medium-scale inorganic gas pools are formed in the marine Meso-Palaeozoic Group and only small ones are formed in the terrestrial Meso-Cenozoic strata. Inorganic gas pools in this basin are distributed along the two deep lithospheric faults on the west and south boundaries of the basin. Gas pools are developed at the intersected part of the ENE-trending faults that control the half graben and the E-W tenso-shear faults, mainly distributed near the Es1, Ny1 and Ny2-Q basalt eruption centres....

    2020-09-15 12:28:59瀏覽:34 northernJiangsuBasininorganicnaturalgaspoolformationlaw

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  • 我國天然氣立法現狀研究

    從能源發展趨勢看,天然氣有望逐步取代石油,成為21世紀人類最重要的能源。本文根據我國天然氣立法現狀,提出了完善我國天然氣立法的建議。...

    2020-06-12 14:54:29瀏覽:1388 天然氣能源管道法naturalgasenergythelawonprotectionofoiland

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  • 我國天然氣立法現狀研究

    從能源發展趨勢看,天然氣有望逐步取代石油,成為21世紀人類最重要的能源。本文根據我國天然氣立法現狀,提出了完善我國天然氣立法的建議。...

    2020-03-24 09:02:42瀏覽:1389 天然氣能源管道法naturalgasenergythelawonprotectionofoiland

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