Experimental study on f-ω regulation model under abnormal methane emission

In view of the difficulty of automatic adjustment, the recovery lag and the major accident potential of the mine ventilation system, an experimental model of the pipe net was established according to the typical one mine and one working face ventilation system of Daliuta coal mine. Using the best uniform approximation method of Chebyshev interpolation to fit the fan performance curve, we experimentally determined fan characteristics with different frequencies and establish the data base for the curves. Based on ventilation network monitoring theory, we designed a monitoring system for ventilation network parameter monitoring and fan operating frequency automatic control. Using the absolute methane emission quantity to predict the air quantity requirement of branch and fan frequency, we established a f-ω regulation model based on fan frequency and absolute methane emission quantity. After analysing methane emission and distribution characteristics, using CO_2 to simulate the methane emission characteristics from a working face, we verified the correctness and rationality of the f-ω regulation model. The fan operation frequency is adjusted by the method of air adjustment change with methane emission quantity and the curve searching method after determining air quantity requirements. The results show that the air quantity in a branch strictly changes according to the f-ω regulation model, in the airincreasing dilution by fan frequency regulation, the CO_2 concentration is limited to the set threshold value. The paper verifies the practicability of a frequency regulation system and the feasibility of the frequency adjustment scheme and provides guidance for the construction of automatic frequency conversion control system in coal mine ventilation networks.

China＇s Electricity Industry at the Crossroads： New Challenges for Developing the Right Model of Regulation

China is facing important challenges stemming from increasing rates of urbanization and aging population. To pursue its ＂harmonious society＂ objective without disrupting its path to development major overhauls are necessary in education, health, social security and above all in public services, particularly in electricity. China＇s electricity industry is at the crossroads. To meet the challenges, new models of regulation should be developed and applied. This paper examines the current state of the Chinese electricity industry and the burden it imposes on its public finances. It also reviews and critically examines the existing FIT （Europe） and RPS （USA） models of regulation and of promotion of renewable energies and advances on whether they are advantageous for China. It is argued that the electricity industry has already undergone important reforms but cross subsidies still exist, equivalent to 1.5% of China＇s GDP. Drastic rate rebalancing policies will create sustainability problems and a deterioration of China＇s public finances. To avoid such negative results, China has to further reform its electricity industry gradually and use wisely FIT-type programs to bring renewables into the grid and fulfill the Kyoto Protocol

Research on the Theory of Governmental Environmental Regulatory Responsibility

In recent years,the environmental pollution caused by the rapid development of tourist attractions has increasingly become the focus of society,which has triggered scholars to think about the government's responsibility for environmental regulation,and has generated a variety of theories in the academic world.For example,the stakeholder theory extends corporate governance to the regulation of tourism scenic spots,and achieves the purpose of perfecting the environmental regulation of tourism scenic spots by continuously enriching the scope of stakeholders'subjects;the property rights theory analyzes the transaction costs generated by various economic activities in the regulation of tourism scenic spots from macro and micro perspectives,and the public goods theory clarifies the concept,types and characteristics of tourism scenic spots as public goods.Therefore,based on stakeholder theory,property rights theory and public goods theory,this paper explores and clarifies the content of the government's responsibility in the environmental regulation of tourism scenic spots,and tries to further enrich the theoretical results of the government's environmental regulation responsibility,in order to provide new ideas for the sustainable development of tourism scenic spots from the theoretical point of view.

The Construction and Application of Work and Production Resuming Behavior System Dynamics Evolutionary Game Regulation and Control Model

The resumption of production after the“suspension”caused by the COVID-19 has emerged as an urgent problem for many enterprises and the government.The resumption of production is actually a dynamic evolution problem from 0 to 1(100%).This paper constructs a general game model and a dynamic replication system for the resumption of production and government support,and gives theorems for the construction of the model.It analyzes the evolution mechanism and scenario conditions for the convergence of enterprise strategies to the“resumption of production”strategy,takes the resumption of production of hog farmers as an example to carry out a study on the regulation of countermeasures to resume hog production,and explores systemic countermeasures and suggestions for the rapid convergence of farmers’strategies to the“resumption of work and production”strategy.The study found that the production resuming behavior system dynamics evolution game regulation model provides a systematic model and method for the study of resumption countermeasures,a general regulation model for the resumption ratio from 0 to 1(100%),and a systematic idea,method and model for exploring the“precise strategy”system to promote the rapid resumption of production.

The Development of the Generation Expansion Planning System Using Multi-Criteria Decision Making Rule

The power expansion planning is large and capital intensive capacity planning. In the past, the expansion planning was established with the proper supply reliability in order to minimize social cost. However, such planning cannot be used in the power markets with many market participants. This paper proposed the power expansion planning process in the power markets. This system is composed of Regulator and Generation Company （GENCO）＇s model. Multi-criteria decision making rule is used for regulator model and several scenarios for GENCO model are applied.

Regulation of osteopontin expression in a rat model of urolithiasis

Objective To investigate the relationship between the expression and regulation of osteopontin (OPN) and urolithiasis.Methods Normal and stone model rats were treated with 1,25-dihydroxyvitamin D3 (D3), vitamin K, testosterone or estradiol for 7 days, and the expression of osteopontin and its mRNA were detected with immunohistochemistry and Northern blot, respectively. Crystals deposited in rat kidneys were observed with a polarization microscope. The concentrations of crystal components in rat urine were determined.Results The results showed that vitamin K, testosterone and estradiol up-regulated the expression of OPN mRNA and its protein, thus decreasing the precipitation of calcium oxalate in rat kidneys. D3 increased the concentration of calcium in urine, and accelerated the sedimentation of calcium oxalate in rat kidneys.Conclusions These findings indicate that OPN may be an important macromolecule in the normal endogenous inhibition of the formation of urolithiasis. Vitamin K, testosterone and estradiol inhibit the formation of stones via up-regulating the expression of OPN in kidneys, while D3 over dose may accelerate the process.

A Model System of Development Regulated by the Long-distance Transport of mRNA

BELl-like transcription factors are ubiquitous in plants and interact with KNOTTEDI-types to regulate numerous developmental processes. In potato, the RNA of several BELl-like transcription factors has been identified in phloem cells. One of these, StBEL5, and its Knox protein partner regulate tuber formation by targeting genes that control growth. RNA detection methods and grafting experiments demonstrated that StBEL5 transcripts move across a graft union to localize in stolon tips, the site of tuber induction. This movement of RNA originates in source leaf veins and petioles and is induced by a short-day photoperiod, regulated by the untranslated regions, and correlated with enhanced tuber production. Addition of the StBEL5 untranslated regions to another BELl.like mRNA resulted in its preferential transport to stolon tips leading to increased tuber production. Upon fusion of the untranslated regions of StBEL5 to a β-glucuronidase marker, translation in tobacco protoplasts was repressed by those constructs containing the 3＇ untranslated sequence. The untranslated regions of the StBEL5 mRNA are involved in mediating its long-distance transport and in controlling translation. The 3＇ untranslated sequence contains an abundance of conserved motifs that may serve as binding motifs for RNA-binding proteins. Because of their presence in the phloem sieve tube system, their unique untranslated region sequences and their diverse RNA accumulation patterns, the family of BEL1-like RNAs from potato represents a valuable model for studying the long-distance transport of full-length mRNAs and their role in development.