New Progression about Gravity Quantization in General Relativity Theory in Real Space-time     

DUAN Shao guang 《保鲜与加工》2002,(1):109-112

Professor Venzo de Sabbata,working at World Laboratory,Lausanne,Switzerland,and Department of Physics,University of Bologna and Ferrara,Italy,is a famous Italy Physicist in the world.He is engaged with a series of creating research works about gravity quantization of General Relativity Theory in the real space-time which attract the attentions of the world.This paper pays the attention to introduce the works of this field,containing mainly:1.quantizing the general relativity theory in the sense of Einstem-Cartan theory,i.e., general relativity adds the torsion,which means introducing spin into the theory of gravity.2. building a compact mathematical tool for research of gravity quantization,the geometric algebra in the real space-time--multivector algebra,i.e.,developing a spinor manifold in the real space-time.  相似文献   

A Comparative Study of Confined Concrete Models under Cyclic Loading     

ZHOU Weng - feng  HUANG Zontg - ming  BAI Shao - liang 《保鲜与加工》2006,(3):59-62

In this paper,four models are selected as the representatives and applied to nonlinear dynamic analysis program for space frames which is based on the beam-column elements using the finite element flexibility method and the fiber model.Park's test on combined axial and bending columns under cyclic loading are taken as the calibrations,comparisons to material and structural member level are drawn and the analytical results of various models are discussed.  相似文献   

Solid Model Design on the Features of Products     

LI Shao bin 《保鲜与加工》2002,(4):29

To research the problem of plastic art design and emulation of products with the virtual reality technology can short the product development cycle and reduce the cost. This paper discusses the information based on the product feature ,solid model with parameters, the structure and function of this system. Combined the product properties with its solid model. Proposed a method with CAD to create the model of the product based on features in the product design. Expressed its feature parameter and shape of model fully .In the case for a deceleration box the feature model has solved the problem of physical information ,geometry information and the informative process in its production management system efficiently.  相似文献   

Preparation of V2O5 Semiconductor Thin Films From Induststrial V2O5     

YANG Shao li  XU Chu shao  CHEN Hou Sheng  HU Zai yong 《保鲜与加工》2002,(5):97-100

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Deformation of deep foundation pits due to excavation and dewatering considering the change of void ratio and permeability coefficient with current stress of soil     

Shao Yu  Jiang Jie  Ma Shaokun  Lyu Hai-bo  He Jianxing  Chen Junyu 《保鲜与加工》2015,(2):92-100

基于修正剑桥模型理论,推导了孔隙比e随土体当前应力变化的方程,同时比选了4组经典的描述渗透系数k随孔隙比变化的方程,选择了其中一组最佳的估算公式,编写ABAQUS用户子程序VOIDRI和USDFLD,以实现孔隙比和渗透系数随土体当前应力的变化。在此基础上,研究深基坑降水开挖所致的坑内外土体的变形、围护结构的变形及弯矩,得到以下结论：当考虑孔隙比随土体当前应力变化时,坑外地表沉降量、墙体的水平位移、地下连续墙的弯矩、坑底隆起量均大于孔隙比为定值时的情况;当考虑渗透系数随土体当前应力变化时,坑外地表沉降量、墙体的水平位移、地下连续墙的弯矩均小于渗透系数为定值时的情况,但同时考虑渗透系数和孔隙比变化情况时,其对坑底的隆起量的影响可以忽略不计。  相似文献   

Research on the Steel of High Wear-Resistant Alloy Steel W1     

JIANG Han xiang  SUN Shan chang  YI Chun  WANG Shao nuo  CHEN Ming 《保鲜与加工》2002,(2):52-55

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Summarization of Current Research on Application of Durability of Structures     

LI Hong yi  CHEN Zhao hui  BAI Shao liang  XIANG Chang kui 《保鲜与加工》2001,(2):98-103

This paper summarized the recent research results about the durability of structures, introduced their current application in durability design, appraisal, estimation of rest life and strategy of maintenance and strengthening as well as in other fields.  相似文献   

猕猴桃溃疡病生防芽孢杆菌B2的鉴定及应用     

邵宝林  王成华  刘露希  张婧  庄启国  朱天辉 《中国农学通报》2015,31(26):103-108

猕猴桃溃疡病是一种毁灭性细菌病害,该病发展迅速,防治难度大,严重制约了猕猴桃产业的发展。为找到一种有效防治该病的方法,针对化学防治易产生抗药性、污染环境、杀伤天敌等特点,从猕猴桃根际土壤中分离共获得25株芽孢杆菌,采用点菌法筛选出4株对猕猴桃溃疡病菌(Pseudomonas syringae pv.actinidiae)具有拮抗效果的菌株(抑菌圈直径达到5 mm以上),其中B2拮抗作用最强。根据菌落(体)形态特征、生理生化鉴定以及16S r DNA序列分析,初步鉴定B2为蜡样芽孢杆菌(Bacillus cereus)。将B2的发酵原液稀释成1×109cfu/m L的发酵液,并在此基础上依次配制50、100、500、1000、2000倍的稀释液,用于盆栽试验。盆栽试验采用喷雾法,30天后的防治效果分别达到了90.45%、86.52%、80.90%、67.98%、47.19%、15.73%,60天后尽管病斑有少量增加,旧病斑有所增大,但与对照相比,病斑增长速度明显减缓。大田试验结果证明,该菌具有较好的生防潜力,喷雾法选择B2发酵液的50倍稀释液,涂抹法选择B2发酵液的100倍稀释液,可有效降低猕猴桃溃疡病的危害。  相似文献   

德宏水牛及其杂交品种体尺测定   总被引：1，自引：0，他引：1  

王晓华  黄启超  邵俊花  葛长荣  汤守锟 《中国农学通报》2007,23(1):21-021

试验对36～39月龄全放牧饲养的15头德宏、摩本、尼本水牛进行了体尺测定研究，此项试验根据水牛品种不同分为三个处理组。结果显示，杂交水牛尼本的鬐甲高、十字部高、坐骨节宽比德宏水牛分别提高5.5%、7.4%、9%，差异显著。杂交水牛摩本的鬐甲高、十字部高、坐骨节宽比德宏水牛提高5.9%、8.0%、11.9%，差异显著。摩本的肢长指数优于尼本，差异显著。此项试验结果表明，用尼里、摩拉与德宏水牛杂交，提高了德宏水牛的体尺与体况。  相似文献   

Using midday stem water potential for scheduling deficit irrigation in mid–late maturing peach trees under Mediterranean conditions     

José Manuel Mirás-Avalos  Francisco Pérez-Sarmiento  Rosalía Alcobendas  Juan José Alarcón  Oussama Mounzer  Emilio Nicolás 《Irrigation Science》2016,34(2):161-173

Irrigation techniques that reduce water applications are increasingly applied in areas with scarce water resources. In this study, the effect of two regulated deficit irrigation (RDI) strategies on peach [Prunus persica (L.) Batsch cv. “Catherine”] performance was studied over three growing seasons. The experimental site was located in Murcia (SE Spain), a Mediterranean region. Two RDI strategies (restricting water applications at stage II of fruit development and postharvest) based on stem water potential (Ψ_s) thresholds (?1.5 and ?1.8 MPa during fruit growth and ?1.5 and ?2.0 MPa during postharvest) were compared to a fully irrigated control. Soil water content (θ_v), Ψ_s, gas exchange parameters, vegetative growth, crop load, yield and fruit quality were determined. RDI treatments showed significantly lower values of θ_v and Ψ_s than control trees when irrigation water was restricted, causing reductions in stomatal conductance and photosynthesis rates. Vegetative growth was reduced by RDI, as lower shoot lengths and pruning weights were observed under those treatments when compared to control. However, fruit size and yield were unaffected, and fruit quality was slightly improved by RDI. Water savings from 43 to 65 % were achieved depending on the year and the RDI strategy, and no negative carryover effect was detected during the study period. In conclusion, RDI strategies using Ψ_s thresholds for scheduling irrigation in mid–late maturing peach trees under Mediterranean conditions are viable options to save water without compromising yield and even improving fruit quality.  相似文献