共查询到20条相似文献，搜索用时 15 毫秒
1.
DENG Zhao-jing 《保鲜与加工》2005,(1):153-156
A new definition of inertia,i.e. the momentum is the measuring of inertia of matter, is proposed. The article through and etc., subjects, the correctness of the new notion of inertia:The monentum is the measuring of inertia has been demonstrated, and the unsolved contradictions of the traditional definition of inetia. And the mass is the measuring of inertia has been revealed. 相似文献
2.
灰树花子实体中水溶性多糖提取工艺优化研究 总被引：3，自引：0，他引：3
以水为浸提液,通过单因素试验研究了颗粒度、浸提温度、浸提时间、水料比、醇沉度等因素对灰树花子实体多糖提取率的影响,并采用正交试验对提取工艺进行优化。试验表明,水料比对灰树花子实体多糖提取率的影响最大,其次是浸提时间,浸提温度影响最小。通过对提取条件的优化,结合收益、成本等综合因素选出最佳优化工艺为:浸提温度90℃,浸提时间5 h,水料比25∶1。验证试验显示,在最佳工艺条件下提取的多糖提取率达13.4%。 相似文献
3.
以消化法测定的亚麻籽总磷、无机磷含量为基准,采用正交试验方法对植酸酶反应条件和测无机磷条件进行了研究。试验结果表明,植酸酶的最佳使用条件是:反应液pH值为4.0,反应时间为9 h,加酶量为1:1;测无机磷的条件是:反应液pH值为5.0,反应时间为6 h,温度为60℃。 相似文献
4.
Based on the discussion of the simulation for the cable prestress, the rigidity theory was used to identify the geometrical dimensions of semi-rigid structures in zero state. When the structural geometry in initial state is given, the geometrical dimension in zero state is determined by the initial prestress distribution. The contribution-matrix method is firstly applied to get the initial lack of fit. However, the influencing factor of initial lack of fit on the displacement of control point is linear superposition, that is, the structural response is linear, and it is irreconcilable with the geometry nonlinear of semi-rigid structure. In order to reduce the error of nonlinear structural response, the influencing factor in the contribution-matrix method is revised, and modified contribution-matrix method is put forward. Programs by ANSYS parameter design language APDL are worked out for the form-finding analysis of beam-string structure of a practical project. The numerical results show that the modified contribution-matrix method reduces the errors of the assumption of structural linear response. And it can be applied to the form-finding of semi-rigid structures with small stiffness. 相似文献
5.
The structure of liquid mercury is determined by 0 -20 type powder diffractometer. A new simple method is proposed to analy the structure of non-atom liquid by using the intensity diffraction profiles. It is found that the space between two nearest neighbor Hg atoms is 3.00 A and the second near neighbor atoms is 3.38 A. The method of peak separation for X-ray diffraction profile is proved to be effective by applying to non-atom liquid system. 相似文献
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On the basis of sufficient discussion of hydrogeologic condition of geothermal water in the Xaoquan area, authors a mathematical is studied with MODFLOW model is established, and then the geothermal water is studied with MODFLOW program. Andthe mathematical model is identified. The authors compare the simulative water level with actual water level. The MODFLOW program can study geothermal water,when the simulative water level approximated to actual water level, and the mathematical MODFLOW model is right. Geothermal water under condition of different exploitation is stndied with the MODFLOW program. Sustainable exploitation is achieved. 相似文献
7.
为了研究灰分对煤自燃能力的影响作用，利用绝热氧化实验装置对不同灰分含量煤样进行升温氧化实验，采用R70、TCPT、B 3种指标表征灰分含量对煤样自发氧化过程的影响。结果表明：1）灰分含量越大，煤样低温氧化阶段温升速率越小，温升加速点温度越高，煤样的自发氧化过程越慢，煤越不易自燃；灰分含量大于40%后，煤自燃倾向性快速减弱。温升加速点是反应微观信息的零活化能温度的宏观累计结果，具有直观且滞后的特点。灰分越大，滞后越明显，温差越大。2）R70、TCPT、B 3种指标与灰分关系表现为二次函数。R70和TCPT两种指标显示灰分越大，自燃倾向性越弱，与实践经验相符。受水分权重影响，B指标显示煤样在灰分小于40%时，灰分越大，煤样自燃倾向性越强，这与实践经验相悖。因此，B在判定灰分对煤样自燃倾向性的影响时具有一定的局限性。 相似文献
8.
When the vertices fail independently with each other by a constant probability,the reliability of a sraph is defined to be the probability that the graph results from deleting thefailed venices together with the incidence edges is connected. The Harary graph,a class of graphswith the best connectivity is considered in this paper,the bound of it's reliability is obtained,and theasymptotic property of reliability is also analysed. 相似文献
9.
Automobile comfort dynamic simulation is necessary when we predict and evaluate the comfort of a automobile or optimize performance of automobile. The nine DOF vibration model of automobile is established , which acts root mean square value of body in multiple work conditions as comfort evaluation indices. Based on the comfort simulation, the Hongyan 1160 is predicted in the way of comfort. The programmes can be used in many different automobiles . The computational result indicates that the model can simulate vibration of automobile truly. It is significant to research automobile comfort evaluation to optimize performance of automobile and comfort simulation .The computational program can be applied to optimize or simulate which has some reference value. 相似文献
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11.
The brief introduction to properly applying HVAC to the sustainable west development of China is made in this article. The advantage of GSHP, a branch of HAVC, is also presented briefly here. The emphasis is put on the fact that this system is a green one which sustainable and practicable characters. At the same time, the comparison between the key technique of GSHP and the geological condition that the system should adjust to is made, which reveals the key point of applying GSHP. According to environment condition, three types of areas are divided in the western regions of China. The feasibility of applying GSHP in each area is explained respectively and the related scheme of applying the system is also summed up. 相似文献
12.
春小麦蒸发蒸腾的调控 总被引：9，自引：0，他引：9
春小麦蒸发蒸腾受环境条件,土壤水分状况和小麦叶片气孔的综合调控。甘肃河西地区辐射强列,与春小麦蒸发蒸腾具有高度相关性（ｒ〉０．９５）,决定了该地区作物的高耗水特性。土壤水分条件在水势为－０．０１－－０．１ＭＰａ时,春小麦蒸发蒸腾受气象条件影响和小麦叶片气孔调节的作用较大;当土壤水势降至－０．３－－１．５ＭＰａ时,叶片气孔开始关闭,太阳辐射对春小麦蒸发蒸腾的作用明显减弱（相关系数ｒ〈０．３１）。土壤 相似文献
13.
采用浸渍法制备CaO/MgO固体碱催化剂,并应用于菜籽油与甲醇的酯交换反应制备生物柴油。考察了镁钙比对CaO/MgO催化活性的影响。试验表明,用质量分数22.6%的乙酸钙浸渍MgO,镁钙摩尔比为3～4时最接近等体积浸渍,镁钙摩尔比为1~2时为过量浸渍。镁钙摩尔比越低,催化剂活性越高,但镁钙摩尔比低于3时,催化剂活性组分分布不均匀,且活性增加不明显。所以最佳镁钙摩尔比为3～4。 相似文献
14.
研究了啤酒花CO2萃余物中总黄酮的提取纯化工艺。采用单因素试验确定乙醇体积分数、提取时间、提取温度和料液比对提取效果的影响;通过正交试验,得到最佳提取工艺条件为:乙醇体积分数为60%,料液比为1∶30,温度为70℃,提取时间为90 min,在该提取条件下总黄酮质量分数为62.7 mg/g;经饱和的水正丁醇溶液萃取,可得到纯度为20.3%的黄酮提取物;经聚酰胺树脂分离纯化,可得到总黄酮纯度为62.2%的提取物。 相似文献
15.
乳化剂对面条品质改良的研究 总被引：1，自引：0，他引：1
复合使用4种乳化剂(SSL,CSL,DATE,单甘脂)对面条进行品质改良,应用响应面分析法对乳化剂的添加量进行优化,并对乳化剂之间的协同作用进行分析。结果表明,乳化剂对感官评分的影响次序依次为DATE>SSL>CSL>单甘脂;DATE与SSL的交互作用最为强烈,其次是DATE与CSL;乳化剂的最佳添加量为SSL0.048%,CSL0.023%,DATE0.031%,单甘脂0.024%,此时的感官评分为92.1分。 相似文献
16.
《保鲜与加工》2003,(11):130-133
The paper firstly analyzes the challenges the stockjobber's brokage is now facing, points out the inevitability and feasibility of implementing CRM for stockjobber.Then how to implement CRM is shown .It includes differentiating its brokage supported by CIC , differentiating its mangement based on CLV and differentiating its service according to customers' investment preference and rebuilding its brokage flow using information flow. Lastly,the framework of CRM of stockjobber's brokage is given and what should be paid attention to when it is implemented is also put forward. 相似文献
17.
Discrete Element Method(DEM) is used to study the flow pattern of loose powder which is indented by a rigid punch in an open die.Information such as trajectories or velocity of the particles movement and density distribution of the granular material during compaction is obtained.Typical powder flow characters in given areas can be observed in the theoretical simulation and experiment.It demonstrates that DEM can capture the major features of the powder flow behavior under low-pressure compaction when there is intense shear,and the conclusion of the flow behavior of compacted powder is useful to the industrial designing. 相似文献
18.
梨园生草对果树部分害虫天敌的影响 总被引：1，自引：0，他引：1
摘要：【研究目的】为研究梨园生草对果树害虫天敌的影响,【方法】采用3种生草方式和托盘法调查方法。【结果】结果表明,种植三叶草、苕子和自然生草,对保护害虫天敌都具有良好的效果,8次调查天敌数量之和,种植三叶草、苕子和自然生草依次为387头、300和149头;土壤清耕,不利于保护害虫天敌。梨园生草也为害虫提供了栖息场所,其中以自然生草的数量最大为3267头,以后依次为种植三叶草、苕子和土壤清耕处理,分别为2622、2026、122头。结果还显示天敌和害虫之间存在相似的消长规律。【结论】与梨园土壤清耕相比,果园生草有利于保护果园生物多样性,对保护害虫天敌作用明显,其中以种植三叶草效果最好。 相似文献
19.
Based on the small deformation assumption, the equations of the laterally loaded piles influenced by the axial load were established. The effect of axial load on the lateral response of piles was studied with parameter analysis. The analysis shows that internal force and deformation of laterally loaded pile under axial loading is actually closely linked with the values of axial and lateral loads. In general, the high level axial load should be focused on. It is more significant that the effect of axial load on the internal force and lateral deflection of the upper part of flexible piles, while there is little effect on deep of long-thin pile foundation. The effect of axial load on the lateral response of pile is the largest as coefficient form of subgrade reaction increases linearly, while the effect is minimal as coefficient form of subgrade reaction is a constant. Except in case of buckling, the changes of axial load along the pile direction have little influence on the magnitudes of deflection and moment. The assumption that the axial load is constant with depth can meet the requirements of engineering. 相似文献
20.
棉花种子介电特性的试验研究 总被引：2，自引：1，他引：2
将棉花种子简化为一种复合介质模型,通过试验测试种子的介电常数,探讨种子的介电特性,分析频率、湿度与种子介电特性的关系,得出介电常数随各参数变化的规律,为合理地确定介电式种子分选机的结构参数和工况参数提供理论依据。对外表完整与表面破裂的种子进行吸湿性的对比试验研究,从而为提高介电式种子分选机的分选效果创造条件。 相似文献