Safe plan and design of geo-landscape in Hunan:analysis of landscape safety and ecological benefits of graded flow-block-up and decentralized water-store along river banks
This paper discusses the reasonable maximum grain size and graded size,introduces the theory and experimental results for selecting optimal gradation,proposes the experiential data for optimal gradation.
The turbulent law of open channels has been studied under the transition state,the laminar flow,transition state and fully developed turbulence can be thought as a developing,graded and fuzzy process,on the basis of which,with introducing the degree of membership of fuzzy mathematics,the turbulent law under the transition state can be described as the comprehensive function of degree laminar flow and degree turbulence,and the velocity distribution formula and the resistant coefficient formula under the transition state are deduced.
Structure of some ?-graded lie superalgebras of vector fields
In this paper we classify?-graded transitive Lie superalgebras with prescribed nonpositive parts listed in [K2].
We also study the structure of the exceptional?-graded transitive Lie superalgebras and give their geometric realization.
In the first paper we determined the graded algebra A(Γ2[3]) of Siegel modular
The graded $\mathbb{F}_p$-algebra A(V) turns out to be normal and Cohen--Macaulay, there is an analogue of Steenrod powers and also a "Karagueuzian and Symonds-type" finiteness theorem for its invariant theory, etc.
Research in fluvial geomorphology in China during the past 30 years was mainly along the lines of valley geomorphology, channel geomorphology, estuaries and deltas. A great amount of systematic investigations has been carried out in the fields such as valley evolution history and features of Changjiang River(Yangtze River) and Huanghe River(Yellow River) and their relations with geology, climate, neotectonic movement, etc. Field evidence suggests that the course of Sanxia(the Three Gorges) of Changjiang were...
Research in fluvial geomorphology in China during the past 30 years was mainly along the lines of valley geomorphology, channel geomorphology, estuaries and deltas. A great amount of systematic investigations has been carried out in the fields such as valley evolution history and features of Changjiang River(Yangtze River) and Huanghe River(Yellow River) and their relations with geology, climate, neotectonic movement, etc. Field evidence suggests that the course of Sanxia(the Three Gorges) of Changjiang were formed as early as at the end of the Cretaceous, and then the Yangtze valley was sharply cut down from the uplifting Exi planation surface, and took shape of a series of deep gorges into limestone strata. Investigations have also found that the upper reach of Jinsha River near Dengke once flowed southeastward into Yalong River. Recently the study of river valley geomorphology of the Xizang Plateau reveals that Yaluzangbu River is an antecedent river and that the Daguaiwan gorge in the east of it is neither an elbow ot capture nor a tributary flowing westward to join the Indus as were formerly taken to be. Research into channel geomorphology developed somewhat later, but has made rapid progress. A grade separation system has been put forward for the classification of channel patterns, and attentions given to the dynamic characteristics of the formation and evolution of channel patterns by using C_v(variation factor of the peak discharge) and ρo/ρp(the ratio of incoming sediment concentration to the sediment carrying capacity in a channel) as indexes to indicate the stabilities of different channel patterns and the mutual transformations among them. By analyzing many rivers with heavy sediment concentration, a wandering index has been derived. Rivers having the value of greater than 5 are called shifting and less than 2 unshifting. In the middle and lower Changjiang, the latest research of meanders and relatively stable channel patterns has had some results. Observations and simulation experiments con the fluvial processes of the channels above and below reservoirs reveal that the channel of Huanghe below Sanmenxia Reservoir, after baving been washed by clear water, still remains shifting for a long time, and the headward silting end of Weihe channel above the reservoir stretches out or draws back within a certain limit. The investigations of deltas point out that since the Quaternary the mouth of Changjiang has been extending southeastward and that there exist imbricate fossil deltas under the water. As for the Huanghe delta, it is evident that since the diversion of the river course in 1855, a new delta with an area of 5,450 km~2 has been built up. Penetrating research has also been made on the geomorphological features and processes of the evolution of Qiantang River. Field survey discovers that the main source of Changjiang is Tuotuo River rising in Geladandong snowberg, and that of Huanghe is Kariqiu River originating in Geshigeya Mountain of the Bayankala Mountains.
According to the specification recently promulgated, it is required to determine filling criteria of incoherent coarse grain materials on the basis of their relative density. But in the light of the construction of earth rockfill dams at home and abroad, there are a series of problems to be solved in carrying out the requirements stipulated in the specification, such as the testing method of relative density of the coarse materials, the standardization of the method and its theoretical basis, method for determination...
According to the specification recently promulgated, it is required to determine filling criteria of incoherent coarse grain materials on the basis of their relative density. But in the light of the construction of earth rockfill dams at home and abroad, there are a series of problems to be solved in carrying out the requirements stipulated in the specification, such as the testing method of relative density of the coarse materials, the standardization of the method and its theoretical basis, method for determination of the relative density of the materials, method of analysis of practical errors, the confidence level of the representative model of gradation of the materials and some problems in the construction work concerning this material, etc.In this paper problems about continuous grading material as mentioned above are studied.
At present, an outstanding problem regarding the rational evel■tion of rock m■ss is trying to use one form■la and same p r meters to appr■ise the q■lity of all typ■s of rock mass, ignori■g■the controlling effect of the texture of rock m ss o rock m chanics. A new m thod to determine rock mass quality is prese ted i■ this pap r. Different formulae are used in accordance weith vatio s typs of rock ■mss texture, B■sides, grading of typ s of rock mass is also st■died.