猪粪沼液施用量对水稻农艺性状和青贮品质的影响

为就地消纳猪场养殖废弃物沼液,降低环境污染,本试验研究了不同沼液施用量对水稻的农艺性状和青贮品质的影响。设计了常规化肥(CF)、空白对照组(CK)和17个N2~N48不同沼液氮水平施肥组,共19个组。随着沼液施用量的增加,水稻分蘖数有显著增大,生物量呈先增加后降低的趋势,N8施肥组生物量最高。青贮稻的质地、色泽和气味总体评分随着沼液施用量的增大呈先增加后降低的趋势。当沼液施用量超过N240%替代氮肥时,青贮稻的pH有显著升高(P<0.05)。与CF和CK相比,沼液N2~N8施肥组中性洗涤纤维略有降低(P>0.05),但沼液N14、N16、N20、N28、N32、N36、N40和N48施肥组NDF有显著的升高(P<0.05)。不同沼液施肥组靑贮稻的可溶性糖、酸性洗涤纤维、粗蛋白和粗纤维与CF相比均无显著变化。与CF相比,沼液N2~N24（除N14）处理组青贮稻的粗灰分含量没有显著差异(P>0.05),但在沼液氮肥(N280%~N480%)超量施用时,粗灰分含量明显降低(P<0.05)。猪粪沼液肥替代化肥有助于提高水稻的生物量,改善青贮饲用品质,但不宜超量施用。     

Study on Intelligent Displaying Mechanism of Control Fissure of Perilous Rock

Perilous rock is a kind of typical disaster and characterized by multitudinous structural planes; when the disaster happens, only one of the planes is the control fissue and the others are secondary. In this paper, the authors have done some attempts for     

A Matlab Based Numerical Simulation Analysis of Shore Stress in Vacuum Plate Glass

A numerical simulation method, the node method, and single, multi-triangle progression were used to analyze the shore stress field of vacuum plate glass. By optimizing the shore distribution, the points of greatest and least stress in vacuum plate glass were determined. The distributions of greatest stress in vacuum plate glass were calculated using MATLAB. These calculations can provide numerical foundations for accurately analyzing the shore stress and flexibility of vacuum plate glass. The result shows that the greatest stress exists in the end surface of every shore, and the maximal stress is in the second shore at four-square sides, then follows the shore of next row. The theoretical calculations correspond to the software analysis results.     

Landfill Leachate Treatment by Cavitating Water Jets

Cavitating water jets were used to degrade complicated organic compounds sampled from landfill leachate from a sanitary landfill in Chongqing, P. R. China. The law of chemical oxygen demand (COD) and the impact of factors such as pumping pressure, confining pressure, cavitating time and pH were evaluated in the experiment. We concluded that a cavitating water jet can degrade complicated organic compounds. Cavitating water jets therefore can improve biological oxygen demand (BOD)5/COD. The optimal cavitating condition was also obtained: at a pH 9.0, confining pressure 0.6MPa, cavitating time 90mins and pumping pressure 10MPa,the COD, BOD5 and BOD5/COD increase to 124.8%, 293.3% and 52.44% respectively. Chromaticity decreases while SS increase to 191.5%. These changes create good conditions for subsequent treatment.     

A cusp catastrophe model study of destabilization of soft sandwich rock slope

A slope geomechanical model was proposed based on the destabilization characteristics of soft sandwich rock slopes. Based on an analysis of the effects of internal external factors on slope stability, the cusp catastrophe model of slopes can be employed to analyze and predict the necessary conditions leading to slope catastrophes. During the processing of the mass and energy exchange with the external, this may lead to the change of controlling variables. Slides or quick or slow creeping thus may take place due to environmental complexity. This work helps deepen understanding of the formation of landslides and makes feasible the applcation of the catastrophe model to slope destabilization investigations.     

Corrosion behavior and mechanism of AZ40magnesium alloy in simulated sea water

Tafel polarization curve and electrochemical impedance spectroscopy (EIS) techniques were employed to investigate the corrosion behavior of AZ40 magnesium alloy in simulated sea water. The surface morphology of the alloy during exposure was observed with an optical microscope and a scanning electron microscope. The pH variation of bulk solution during corrosion was recorded. The results show that the major corrosin forms of AZ40 magnesium alloy in simulated sea water were characterized by pitting and filliform corrosion. The corrosion occurs spontanesously. The insovable corrosion products, which precip it ate on the alloy surface were characterized by porsity and hetorogeneity, indicating that these products can not prerent further alloy corrosion. Therefore, the corrosion of AZ40 magnesium alloy spreads rapidly and the alloy surface is destroyed severely during short exposure period.      

Site selection for a measuring and controlling device of initial phase based on maximum elevation angle

We introduced a site selection method based on the modified maximum elevation angle intended for mountains possibly affecting the measurement and control of the initial phase in a launching port located in mountainous areas. To use the former analysis results, the method, along the helices whose center is the launcher's project point, analyze each point's visibility on the helices. The visible area can be obtained by comparing the visibility at each moment in the initial phase. Finally, there can be three points in the above visible area with distances longer than required.     

Dynamic simulation of and experimentation with tracked vehicle hydrostatic steering characteristics of zero differential systems of a power shift steering transmission

This research investigated problems influencing tracked vehicles steering dynamic characteristics, such as rolling resistance during straight driving, steering centrifugal resistance, acceleration resistance during straight driving, scratching soil resistance of steering. Based on research about the relationship between the hydraulic steering regulation speed system and its maximum stable work pressure when vehicles have central steering on good roads (such as cement and rural roads), a zero differential hydraulic steering system of power shift steering transmission can ensure that vehicles maintain straight ahead stability through reasonably matching a steering drive system. The test indicates that vehicles have good dynamic characteristics when the work pressure accounted for 60% to 80% of the security work pressure.     

An edge detection method based on a good point set genetic algorithm

In order to improve the convergence rate of genetic algorithms based on edge detection, a novel edge detection method based on a good point set genetic algorithm (GGA) was proposed. The proposed method designed the crossover operation with the theory of good point set in which the progeny inherits the common genes of the parents which represent its family so as to improve the convergence rate of the genetic algorithm. Furthermore, before the algorithm was used for edge detection, the feature space of the image grey level was transformed into the feature space of the fuzzy entropy. Dissimilarity enhancement processing next was applied to the image by using a fuzzy entropy theory to filter the non edge pixels so as to reduce the scale of the solution domain. This approach offered another efficient way to improve the convergence rate. Experimental results show the proposed algorithm performs very well in terms of convergence rate. The detected edge image is well localized, thin, and robustly resistant to noise.     

Simulation and experimental study of the fire performance of underground shopping streets

Underground streets have been developed in cities with land shortages. We simulated the dynamic distribution characteristics of smoke flow and temperature from fires under natural conditions in underground streets. The experiment was carried out at the Sichuan Fire Research Institute of Public Security Ministry, P.R. China. A 500 kg fire source was used in a real underground street. Temperature distribution at different heights and personnel escape routes are shown in two typical sections. The comparison between the computer simulation data and experimental data validates the simulation. This study provides a valuable reference for fire assessment of underground shopping streets.