The serious soybean supply problem was called for attention according to an analysis of current soybean production in China and growing import from outside world. It was pointed out that for ensuring soybean supply, the only way is to keep basically self-sufficiency with some reasonable amount of supplement from import as soybean has been being the most important nutrition source in the long Chinese history and has taken the unsubstitutional position in modern food processing industry. Based on the above facts, five facets of suggestions and measures for developing domestic soybean production were raised. Furthermore, on expanding and enhancing the most important and powerful technological aspect, soybean breeding and genetics, four suggestions were put forward for the related authority^ reference. They are： (1) to further establish and improve the soybean cultivar development and breeding research systems; (2) to further establish and optimize the soybean research team with multiple discipline interaction and research atmosphere; (3) to organize some breakthrough programs with multiple disciplinary cooperation, such as those in high yield ideal type establishment, hybrid soybean production and utilization of heterosis, and creation of specific quality trait mutants; and (4) to establish an advanced soybean genomic study program for future improvement of breeding technologies.
In this paper, the special relativity (SR) is resolved in ten elements, i. e. two postulates, one transformation, three equations, and four inferences. After the theoretical and experimental examination, the problems of SR are concentrated on two fields—the light speed constancy postulate, and the inference of light speed can't superluminal.
After 1992, experiments have revealed superluminal velocities, i. e. velocities faster than light, and this behavior has been observed both in the classical and quantum domain. In 2001, there is evidence to suggest that the velocity of light is slowly decreasing over cosmological time scales. This would call into question whether the light speed is truly constant or not . If the new physical theory stands up in the international scientific world, it would be the scientific revolution since Einstein's theory of SR.
The south-north water project have been listed in the Tenth Five-Year Plan. Recently the east line and middle line in this project have been ready to start working. In order to change the status of lacking water in north of China, this paper discusses the necessity and the feasibility of diverting water from the southwest trunk rivers with the digital earth virtual technique, including the amount of water diverted, the geologic bedrock, the optimum line of diverting water and the impact on entironment.
To transform and utilize desert,one has to withstand wind-and-rain and sand-and-stone storms, also,one has to set up in deserts numerous belts of windbreak forests. Then,one can engage in large-scale sandy-agriculture,improve the environment,and step-by-step transform entire deserts to vast green lands. Currently, all countries are unable to, or consider it impossible to accomplish these.
In this paper，it is suggested to use Vortex Tower Malls(VTM) and the vortex breakdown feature in fluid dynamics, together with interferences from stabilizing chambers, etc. , to convert incoming strong winds to random eddies and weak currents, and to establish “ readily-made and highly effective man-made windbreak forest”. Suitable weighs will be distributed in stablizing chambers to enable VTM to stand up against very strong wind storms. Within the weak-wind regions,one can engage in large scale sandy-agriculture, work with experts from various disciplines to transform and utilize deserts at suitable levels, to convert entire deserts to vast green lands,and to convert useless and trouble-causing deserts into valuable lands. Also, VTM can be used to protect work-bases for long-term and deep-in-depth exploration in deserts,so as to expedite discovery and evaluation of deeply buried and world-scale mineral resources.
The resettlement and loss caused by inundation at Kaixian in the area of the Three Gorge Reservoir is tremendous. The proposals of “large protection” and “small protection” schemes for reducing the inundation have been rejected. A scheme of land creation by sand retaining and water sluicing has been proposed by the author. The principle of this proposal is to keep the water of Xiaojiang River to flow out, but retain the sediment at river bed and flood plain. In this case the sediment is taken as a useful resource to heighten the level of land, on which a lower levee will be easily constructed to protect the farmland along the Xiaojiang branch reservoir.The original farmland will turn to be more rich and be preventable from drought and water logging disaster all the year. All together 37.8 thousands mu (2, 495 hect.) farmland will be protected and 11.0 thousands mu (726 hect. ) flood plain will be changed to farmland. This area can compensate nearly the total inundated land of 50.3 thousand mu (3, 320 hect.) at Kaixian. The feasibility study supported by the Ministry of Water Resources is now carried out. This scheme with its low cost and big profit can be applied to the similar project.
The combination of Traditional Chinese Medicine with modern nutriology and food science is the most obvious characteristic and advantage of Chinese health food, which has a long history and has developed rapidly in recent years. In this article, the history, status quo, fundamental theories, techniques, administrative management, market supervision, concomitant questions and solutions of Chinese health food were discussed.
This article introduces the development of tantalum & niobium industry in China and in the world, especially reviews the metallurgical and working technology development of tantalum & niobium in China. Inview of the development condition and economic status of Chinese tantalum & niobium industry in world trade, the existing problems, development direction and measures that should be taken are pointed out.
Computer simulation on heat treatment is the foundation of intelligent heat treatment. The simulation of temperature field, phase transformation, stress/strain in complicate quenching operation has been realized with the three dimensional non-linear finite element method model and the methods of treating for abruptly changed interface conditions. The simulation results basically fit those measured in experiments. A production line with intelligent sealed multipurpose furnace has been developed based on the combination of computer simulation on gaseous carburizing and computer control technology. More than 3 000 batches of workpieces have been processed, and all are up to standard. The application of computer simulation technology can significantly improve the load-carrying ability and reliability of the nitriding and carburizing workpieces, reduce heat treatment distortion, and shorten carburizing duration. It is recommended that the reliable product design without redundancy be performed with the combination between the CAD of mechanical products, the CAE of materials selection and heat treatment, and the dynamic evaluation technology of product reliability.
A concept of two different reaction zones was proposed based on the FCC reaction mechanism. The concept was used to design a novel reactor with corresponding engineering measures. Experiments were conducted on the newly developed reaction system. The test run results of the 1.4 Mt/a MIP commercial unit showed that mass yield of dry gas was reduced by 0.41 % and mass yield of slurry was reduced by 0.99% , while mass yield of light ends was increased by 1.17%. The volume fraction of olefin in the cracked naphtha dropped by 14.1% while the volume fraction of isoparaffin increased by 12.9% and the mass fraction of sulfur was reduced by 26.5% with maintaining the octane rating index unchanged and a significant extension of the induction period compared with the conventional FCC process.
The paper analyzes the interaction between woven fabric and needle in the integrated piercing process of orthogonal laminated woven fabrics, proposes and establishes fiber bending elongation and elongation breakage model, and talks over the structure parameters influencing fiber bending elongation. Through theory analysis and testing result analysis, the paper indicates that breakage caused by bending and elongation around needles is a function of the ratio X between diameter of needle in Z direction and needles distance in Z direction, and suggests that smaller X value be chosen in order to reduce fiber elongation breakage of the integrated piercing.
After existing study methods are analyzed, a new researching model for conceptual design based on extension and genetic algorithms was presented. The inner-model and outer-model of product project were set up with matter elements. In genetic algorithms the coding for individual, the means for cross-over and mutation were all founded based on the inner-model. The fitness function was set up combined with relationship function. The technique solves the innovative and incompatible problems in conceptual design. The feasibility of the new researching model is testified by three conceptual design examples for retarder.
An obstacle avoidance strategy for mobile robot is presented based on obstacle position and size information. Furthermore, rational robot paths in obstacle avoidance are discussed in detail, which leads to the final important result of optimal path for mobile robot to avoid an obstacle. Simple as the results are, they have been shown by simulations te be effective and convenient in implementation. A good application prospect of the result can thus be expected.
The airflow on the flightdeck is an important factor which influences helicopter flight safety. The airflow velocity distribution characteristics directly influences simulation accuracy of helicopter flight dynamics. Based on the Navier-Stokes equations, the method to determine the airflow velocity in real-time is discussed using BP neural network. This method can be used for flightdeck airflow real-time simulation, and it can improve helicopter flight simulation accuracy.
In the paper, three types of steel braced frames are introduced. The features of concentrically steel braced frames, eccentrically braced frames and off-centrically braced frames and their application scope are concluded. Some calculating rules and design methods about concentrically steel braced frames and eccentrically braced frames are put forward.
Based on the image theory, the oscillation of a cylinder in front of two vertical walls intersecting normally in the otherwise static water is transformed into the oscillating problem of four symmetrically arranged cylinders. The transformed problem is solved by an analytical method based on eigenfunction expansion. Numerical experiment has been performed in order to examine the influence of the distances between the cylinder and the walls and water depth on the added mass and radiation damping of the cylinder. The calculation shows that the added mass and radiation damping of the cylinder in front of the two vertical walls increase abruptly. The added mass and radiation damping oscillate with wave number, and the oscillating frequency increases with the increase of the distances between the cylinder and the walls. Furthermore, the added masses and radiation damping are linear with the water depth in the range of low frequencies.