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1.
Zhang Yunhuai Zeng Zhengquan Ou Zhongwen 《保鲜与加工》1997,(2):84-88
The monolayer model about aluminate coupling agent on the surface of flysah microsphares is proposed. The chemincal coupling mechanism on the boundary of aluminate coupling agent with flyash microspheres is verified by the methods of IR and EMS analyses. 相似文献
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Qian Jueshi Meng Zhiliang Zhang Xinyuan 《保鲜与加工》1999,(1):5-9
In order to improve carbonation resistance of high_addition flyash concrete,the grinding of flyash and additon of hydrated_lime in flyash concrete have been studied.It is shown that it is possible to improve the carbonation resistance of high_addition flyash concrete by using these methods without reducing its strength. 相似文献
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Meng Zhiliang Wu Zhongbin Qian Jueshi 《保鲜与加工》1999,(1):24-27
It is shown that the alkalinity of pore fluid of high addition flyash concrete decreases more greatly than that of normal concrete after 7 days,closing to the threshold value of 11.5.Having added 10%lime and 1.5%Na2SO4 in flyash concrete,the alkalinity increased evidently without reducing its strength. 相似文献
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The traditional blocks attract people with their specific space environment. In this paper, the form and character of space environment in traditional blocks are analyzed and some urban design principles of space construction in traditional blocks are investigated. 相似文献
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Because of the high altitude of Qinghai, its air pressure is 0.77 atm which is lower than the atmospheric pressure. Therefore, an analysis is done for carbochlorination reaction of flyash for the extraction of aluminum in such an environment. The phase diagrams and predominance area diagram on chlorides are calculated and drawn and the equilibrium compositions of complex system composed of multi-components are simulated by Factsage software. Results show that, carbochlorination reaction converts Al2O3 and SiO2 which can not directly react with chlorine gas originally to chloride completely, and this demonstrates the thermodynamics feasibility of carbochlorination process. The ratio of FeCl3(Fe2Cl6) to FeCl2 changes with the amount of carbon and chlorine gas. The catalysts like Na2CO3, CaCO3 and B2O3 have some side effects in the aspect of thermodynamics such as consuming chlorine gas and carbon. The volatility of AlCl3(Al2Cl6) is affected by other chlorides. Compared with the normal pressure region, there are advantages and disadvantages to carbochlorination reaction under the pressure below the normal. The work provides thermodynamic data for the process. 相似文献
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The renovation of historical blocks is an important part of urban construction and development. In recent years, research on renovation methods has emerged one after another. This paper discusses the methods and contents of the renovation and renewal of historical blocks from the five senses of human beings and applies the five-sense design method to the renovation and renewal of Shichahai District, Beijing, thus exploring the renovation and renewal methods of historical blocks. 相似文献
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The landscape style and features of historical and cultural blocks in Handan show the landscape characteristics of Handan in the specific cultural and historical period.To explore the landscape style and features of historical and cultural blocks in Handan is of great practical significance to maintain the characteristics of historical and cultural blocks,improve city quality,continue city culture and retain cultural characteristics.According to the advantaged natural geography,human geography factors and the current situation of landscape style and features in Handan City,this study discussed the landscape style and features of historical and cultural blocks through practical investigation and scientific research,found out the main problems and put forward corresponding protection and promotion strategies,in order to create a landscape pattern of historical and cultural blocks with cultural connotation,harmony and order,and distinctive characteristics. 相似文献
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《Journal of Landscape Research》2013,(Z2)
Reasons for landscape environment damages and cultural loss of old blocks in small cities and towns were analyzed from the cultural perspective,i.e.regional cultures have not been given due attention or inherited effectively.On this basis,cultural connotations of landscapes in old blocks,and cultural inheritance-dominated renovation strategies were explored,i.e.focusing on man and culture,inheriting cultures in the overall town planning and constructing physical functions of old blocks. 相似文献
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多品种(系)试验中简化广义格子设计的探讨 总被引:4,自引:2,他引:2
根据多品种(系)田间试验的特点,在Patterson等广义格子设计基础上提出简化广义格子设计(简称SGL设计)。SGL设计基于格子设计的正交性原理,对于可用区组容量整除的任何供试品种数、2-4次重复,均可构成不完全区组设计。且构成方法简便,设计效率因子高,具有可解析性,连通性,SGL设计的参数采用修饰极大似然法估计。 相似文献
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《Journal of Landscape Research》2019,(4)
In this study, three kinds of spaces with different marketplace atmospheres, namely, the tea-drinking space, the commercial space and the courtyard space, are created with the aid of the marketplace culture characteristics of the local blocks in Pengzhen Town and the catalyst theory, so as to achieve the purpose of activating the traditional blocks in Pengzhen Town. The design takes the marketplace culture as the entry point and the most vigorous points as the catalyst points to create a living space with strong marketplace flavor, thereby activating the economic and social activities of the traditional block and promotes the sustainable renewal of the cultural space. 相似文献
11.
《Journal of Landscape Research》2016,(1)
Architectural decoration is a key demonstration of architectural styles, and traditional Chinese architectural forms originating from diversified architectural decorative arts. This paper explored facade decorative art of traditional architecture from the perspectives of carving art decoration, roof type, stylobate and railing, window and door type, and ground pavement, and also elaborated artistic methods of different forms in each aspect. On the basis of investigating Shengjinta historic and archaistic block, the paper also introduced application of decorative arts, and provided references for applying facade decorative arts of traditional architecture in the future archaistic blocks. 相似文献
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Dangerous mountain construction projects block of high and steep slope stability is the important issue of security and disaster prevention, investigation on the surface of the dangerous mountain high and steep slope rock mass structure is the key to the analysis of the problem. The high slope of a major project of the Lancang River, the application of 3D laser scanning technique to study the long-distance survey analysis of rock mass structure analysis method to analyze the distribution of the surface space of the high and steep slope rock mass structure, statistical analysis direction of the advantages of the structure surface and the distribution of rock blocks, as the basis for the application of limit equilibrium analysis method to study the stability of rock blocks of the high and steep slope. 相似文献
14.
《Journal of Landscape Research》2014,(Z4)
Boundary properties,collage and collision time of Erguna and Xing'an block,and old crystal substrate of the blocks are basic geological scientific issues for studying the evolution of north Great Xing'an Range.This study reviewed researches on Erguna and Xing'an block in the past years,and summarized two major problems: one is collage and collision time of both blocks; the other is ancient crystal substrate of the blocks.The two problems are significant for understanding tectonic-magma evolution of the north Great Xing'an Range. 相似文献
15.
Experimental Study of Soil Stress on the Holding Sheet of Pile-Anchor Holding-Block Structure System
This paper studies the soil stress on the holding sheet between the pile-anchor erecting columns of the pile-anchor holding block structure system often used in Chongqing. Based on the indoor model tests, this paper makes a qualitative analysis about the variation rules of the soil stress on the holding sheet. The results are compared with the calculation results on classical soil stress theory. Then, this paper suggests that the classical soil stress theory is unsuitable to calculating and analyzing the soil stress on the holding sheet. 相似文献
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To study the eccentric compression performance of autoclaved flyash lime brick masonry, and validate the applicability of current code’s calculation method, static tests on 36 eccentrically loaded puncheons of standard autoclaved flyash lime solid brick and KP1 type perforated brick with circular holes masonry are carried out by applying eccentric load on the top of the specimens. The bearing capacity of eccentric compression is analyzed using plane section assumption and ideal stress/strain curve. The features and shapes during the process of failure are obtained and the eccentric compression impact factor formula is also obtained by regression analysis of experimental data. With eccentricity increasing, cracking load and failure load are gradually decreased, and the failure features gradually change into large eccentric compression from axial compression. Most test values of bearing capacity under eccentric compression are higher than code calculating values. The average strain distribution in the section is in accordance with the plane section assumption. The theoretical analysis method used is feasible, current code’s formula can be used to calculate the bearing capacity of flyash lime brick masonry under eccentric compression. 相似文献
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利用1981—2010年重庆市34个气象观测站的日(20时—20时)降水量资料及空间间隔为2.5°×2.5°的NECP/NCAR逐6小时再分析资料,对重庆西部区域性阻塞型暴雨天气过程进行统计合成分析,结果表明:(1)导致渝西阻塞型暴雨的大尺度环流背景场为稳定的“两槽一脊”型环流,贝加尔湖低槽与东移的四川盆地低槽同位相叠加,副高西伸并稳定维持,位势场呈现“西低东高”的特点;(2)来自于南海地区的水汽持续输送至重庆西部地区为暴雨过程的产生和维持提供了有利的水汽条件;(3)暴雨发生前后温湿场发生了明显变化,温度场上暴雨发生前和发生时暴雨区附近有着较强的暖平流,而暴雨发生后为明显冷平流,湿度场上700hPa上10g/kg等比湿线及850hPa上15g/kg等比湿线可作为渝西阻塞型暴雨的一个预报参考指标。 相似文献