The enrichment of environmental elements by Saccharomyces cerevisiae was used to obtain Fe-Zn-rich yeast, and the effects of pH, inoculation amount and culture time on Fe-Zn-Zn yeast were studied. The results showed that the influence of different factors on iron - zinc yeast culture was: culture time>...

Currently, the C3H6 conversion is usually low on the Au/TS-1 system. Therefore, the improvement of C3H6 conversion is vital to the commercialization. A series of Au catalysts supported on modified Au/TS- 1 were prepared and tested for direct propylene epoxidation in the presence of hydrogen and oxygen....

First, the experiment deals with the brown rice by the limewater and anaerobic means to concentrate GABA in the brown rice. Then, we make use of lactobacillus fermentation to produce GABA. We obtain the following results of power sequence of the influence factors of the GABA output from optimization...

To investigate the detection of extended-spectrum -lactamases (ESBLs) -based Escherichia coli and their associated risk factors in urinary tract infection in patients with urinary tract infection. Methods The clinical data of 169 patients with escherichia coli infection and ESBLs were analyzed retrospectively....

Over the years, with advances in RNA research, researchers have found not only the large number of circular RNAs found in many organisms, but also their important biological functions. Cyclic RNA is derived from introns or exons, can act as a micro RNA sponge, but also with the protein combination to...

The superposition of the time and space of the grid can not only lead to local overload with random disorder in the large-scale electric vehicle, which Influences the stability, reliability and economy of the urban power grid operation in various degree. This paper analyzes the opportunities and challenges...

With the advent of computer network, network security has been the core of information technology. We put forward a new concept after cloud calculating, that is, cloud security. Up to now, network security and cloud security have no difference essentially. In this paper, the advantages of cloud security...

This note makes a comparative study of multigranulation rough set model and generalized rough set model. It is pointed out that the pessimistic multigranulation rough set model (PMGRS) is a kind of generalized rough set model, it is induced by a reflexive and symmetric relation on the universe. On the...

At present, the rapid development of information technology brings great convenience for people's life, at the same time, also brings all kinds of security problems. The application of data encryption technology in the process of information transmission, provides a favorable safeguard for information...

At first, this paper has summarized the theory of frequency doubling crystal, summarized suitable for uv frequency doubling of the characteristics of nonlinear optical crystal, put forward the theory basis of frequency doubling crystal KTP crystal, debug out of efficient cavity frequency doubling green...

With the development of oil field into the late period of high water cut, the influence of casing damage on oil field development attracts more and more attention.So it's time to begin studying how to prevent and control casing damage. In the non oil layer casing damage well, 49.7% in A - B Interlayer...

In order to solve the problem that the pollution causes and the degree of the injection well can not be effectively identified, based on the consideration of the sensitivity of the reservoir and the water quality of injected water. The mathematical models of injection well pollution were established....

With the development of construction technology, Earthwork synthetic material is a very promising new type on dam materials, which is the more and more widely used. It has seepage control and drainage, filtration, isolation, protection and other functions, especially in the earth dam seepage control...

The objective of this thesis is to provide both theoretical and empirical evidence for the further reform and development of the teaching quality of the undergraduate P. E. majors in the 21 century in order to deal with the confusing problems brought about by the conflict between the expansion and quality...

With the Internet era, people willingness to accept the network shopping gradually improve, continuously improve logistics payment and other supporting services, various types of e-commerce platform have sprung up vigorously. Online shopping has become a way of life of people, which is associated with...

Bandelet transform has undergone two generations of transformation theory development, its main application areas are image sparse expression and image compression, which penec for the first bandelet transform has made an important contribution, it not only involved in the first generation bandelet transform...

New requirements drive the birth of new technologies. Data analysis is the foundation of scientific research, many scientific research is based on data collection and analysis. This paper introduces the basic theory of classical rough set, which is based on the equivalence relation, and uses an upper...