期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
三七种子的大小对窝眼轮排种器充种性能的影响 被引量:8
1
作者 秦伟 于英杰 +3 位作者 赖庆辉 袁海阔 占才学 孙凯 《华南农业大学学报》 CAS CSCD 北大核心 2019年第4期126-132,共7页
[目的]探究窝眼轮排种器型孔尺寸与分级后三七Panax notoginseng种子的适配性对充种性能的影响规律,确定各级三七种子与适配型孔尺寸之间的关系。[方法]将三七种子分为4级,设计了4种不同型孔尺寸的窝眼轮排种器,利用离散元软件EDEM模拟... [目的]探究窝眼轮排种器型孔尺寸与分级后三七Panax notoginseng种子的适配性对充种性能的影响规律,确定各级三七种子与适配型孔尺寸之间的关系。[方法]将三七种子分为4级,设计了4种不同型孔尺寸的窝眼轮排种器,利用离散元软件EDEM模拟各级种子在不同型孔尺寸排种器中的充种过程,分析各级种子在不同型孔尺寸排种器中的充种性能,得到各级种子适配排种器型孔尺寸,并进行了试验验证。[结果]各级三七种子均有适配型孔排种器,5.0~5.5和6.5~7.0mm分级段的种子适配排种器型孔尺寸为7.5和8.5mm;5.5~6.0和6.0~6.5mm分级段的种子适配排种器型孔尺寸为8.0mm。各分级段的种子在其适配排种器中充种时,合格指数均大于95.83%,漏播指数均低于2.00%,重播指数均低于2.17%。确定了种子长轴(l)与孔径(L)之间以及高轴(h)与孔深(H)之间的线性关系方程分别为L=0.58l+4.28和H=0.75h+3.96。[结论]排种器充种性能满足了三七播种的农艺要求,为窝眼轮排种器型孔尺寸的设计提供了理论依据。 展开更多
关键词 三七种子 排种器 型孔参数 充种性能 EDEM软件
下载PDF
A Model of Steady-State Convective Combustion of Micropore Propellants 被引量:2
2
作者 王伯羲 《Journal of Beijing Institute of Technology》 EI CAS 1998年第1期107-112,共6页
Aim To develop a physical and mathematical model related to micropore para- meters of steady-state convective combustion of micropore propellants(MPP). Methods The micropore parameters were measured by WXT-88 mage ana... Aim To develop a physical and mathematical model related to micropore para- meters of steady-state convective combustion of micropore propellants(MPP). Methods The micropore parameters were measured by WXT-88 mage analysis apparatus and the convective combustion characteristic of MPP was measured by a large volume closed bomb, respectively. Rasults Statistical physical model of burning in the micropore and granular burning were developed. The burning rate equation of steady-state convective combustion of MPP was obtained. Conclusions This model correlates the convective burning rate with micropores para- meters for the first time,and the calculating values of convective burning rate are in agreement with test results.The model also can be used to estimate the effects of microporous parame- ters, basic mass burning rate, MPP density and pressure in combustion chamber on the convective combustion characteristics of MPP. 展开更多
关键词 micropore propellant (MPP) convective burning rate combustion model micropore parameters
下载PDF
Rock skeleton models and seismic porosity inversion 被引量:3
3
作者 贺锡雷 贺振华 +2 位作者 王绪本 熊晓军 蒋炼 《Applied Geophysics》 SCIE CSCD 2012年第3期349-358,363,共11页
By substituting rock skeleton modulus expressions into Gassmann approximate fluid equation, we obtain a seismic porosity inversion equation. However, conventional rock skeleton models and their expressions are quite d... By substituting rock skeleton modulus expressions into Gassmann approximate fluid equation, we obtain a seismic porosity inversion equation. However, conventional rock skeleton models and their expressions are quite different from each other, resuling in different seismic porosity inversion equations, potentially leading to difficulties in correctly applying them and evaluating their results. In response to this, a uniform relation with two adjusting parameters suitable for all rock skeleton models is established from an analysis and comparison of various conventional rock skeleton models and their expressions including the Eshelby-Walsh, Pride, Geertsma, Nur, Keys-Xu, and Krief models. By giving the two adjusting parameters specific values, different rock skeleton models with specific physical characteristics can be generated. This allows us to select the most appropriate rock skeleton model based on geological and geophysical conditions, and to develop more wise seismic porosity inversion. As an example of using this method for hydrocarbon prediction and fluid identification, we apply this improved porosity inversion, associated with rock physical data and well log data, to the ZJ basin. Research shows that the existence of an abundant hydrocarbon reservoir is dependent on a moderate porosity range, which means we can use the results of seismic porosity inversion to identify oil reservoirs and dry or water-saturated reservoirs. The seismic inversion results are closely correspond to well log porosity curves in the ZJ area, indicating that the uniform relations and inversion methods proposed in this paper are reliable and effective. 展开更多
关键词 Rock physics rock skeleton models adjusting parameters seismic porosityinversion Gassmann's equation
下载PDF
Additivity of pore structural parameters of granular activated carbons derived from different coals and their blends 被引量:7
4
作者 Yao Xin Xie Qiang +3 位作者 Yang Chuan Zhang Bo Wan Chaoran Cui Shanshan 《International Journal of Mining Science and Technology》 SCIE EI CSCD 2016年第4期661-667,共7页
A series of granular activated carbons (GACs) were prepared by briquetting method from Chinese coals of different ranks and their blends, with coal pitch as the binder. Pore structural parameters including BET speci... A series of granular activated carbons (GACs) were prepared by briquetting method from Chinese coals of different ranks and their blends, with coal pitch as the binder. Pore structural parameters including BET specific surface area (SBEr), total pore volume (Vr) and average pore diameter (da) were measured and cal- culated as well as process parameters such as yield of char (CY) and burn-off (B). The relationship between the pore structural parameters of the GAC from coal blend (BC-GAC) and the ones of the GACs from corresponding single coals (SC-GACs) was analyzed, in which an index, the relative error (δ), was presented to define the bias between fitted values and experimental values of these parameters of the BC-GACs. The results show that the BC-GAC keeps qualitatively the pore structural features of the SC-GACs; as concerned as the quantitative relationship, the pore structural parameters of the BC-GAC from coal blend consisting of non-caking coals can be obtained by adding proportionally the pore structural parameters of the SC-GACs with a less than 10%. Meanwhile, for the BC-GAC from coal blend containing weak caking bituminous coal, the δ increases up to 25% and the experimental pore size distribution differs greatly from the fitted one. 展开更多
关键词 Granular activated carbon Coal blend Pore structural parameters Additivity
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部