Quantized dynamic output feedback control for networked control systems

The problem of the quantized dynamic output feedback controller design for networked control systems is mainly discussed. By using the quantized information of the system measurement output and the control input, a novel networked control system model is described. This model includes many networkinduced features, such as multi-rate sampled-data, quantized signal, time-varying delay and packet dropout. By constructing suitable Lyapunov-Krasovskii functional, a less conservative stabilization criterion is established in terms of linear matrix inequalities. The quantized control strategy involves the updating values of the quantizer parameters μi（i = 1, 2）（μi take on countable sets of values which dependent on the information of the system measurement outputs and the control inputs）. Furthermore, a numerical example is given to illustrate the effectiveness of the proposed method.

Pulp revascularization on an adult mandibular right second premolar:A case report

BACKGROUND Pulp revascularization has become a new method for the treatment of periapical diseases in young permanent teeth in recent years.Through root canal flushing and disinfection,avoiding mechanical preparation,guiding apical stem cells into the root canal and promoting the continuous development of tooth roots,it has achieved good clinical curative effects.But in adult patients with chronic periapical periodontitis with immature roots and open apices,apical barrier technology is often used to treat these teeth.CASE SUMMARY Pulp revascularization of a 26-year-old patient's tooth was performed using cefaclor instead of minocycline and iRoot BP instead of mineral trioxide aggregate as intracanal medication.The case was followed up for 36 mo.Observations showed evidence of regression of clinical signs and symptoms,resolution of apical periodontitis and no discolouration of affected teeth.CONCLUSION For adult patients with chronic periapical periodontitis with immature roots and open apices,pulp revascularisation showed favourable results in treating these teeth.

A novel redox indicator based on relative abundances of C_(31) and C_(32) homohopanes in the Eocene lacustrine Dongying Depression, East China

A suite of oils and bitumens from the Eocene Shahejie Formation(Es) in Dongying Depression was geochemically characterized to illustrate impact of source input and redox conditions on distributions of pentacyclic terpanes. The Es_(4) developed under highly reducing, sulfidic hypersaline conditions, while Es_(3) formed under dysoxic, brackish to freshwater conditions. Oils derived from Es_(4) are enriched in C_(32) homohopanes(C_(32) H), while those from Es_(3) are prominently enriched in C_(31) homohopanes(C_(31) H). The C_(32) H/C_(31) H ratio shows positive correlation with homohopane index(HHI), gammacerane index, and negative correlation with pristane/phytane ratio, and can be used to evaluate oxic/anoxic conditions during deposition. High C32 H/C_(31) H ratio(> 0.8) is an important characteristic of oils derived from anoxic environments, while low values(< 0.8) indicate dysoxic conditions and extremely low values(< 0.4)indicate strong oxic conditions. The C_(32) H/C_(31) H ratio can be applied for deposition condition diagnosis because carboxyl group of C_(32) hopanoic acids might be reduced to C_(32) homohopanes under anoxic conditions, and oxidized to C_(31) homohopane under oxic conditions. Advantages to use C_(32) H/C_(31) H ratio as redox condition proxy compared to the HHI and gammacerane indexes are wider valid maturity range,less sensitive to biodegradation influence and better differentiating reducing from oxic environments.

Study on Lignite-Blended Burning Technology in the 1025t/h Bituminous Boiler

Due to a serious shortage of the coal in Tonghua, a retrofit solution of mixing warm flue gas extracted from reversing chamber into the coal pulverizing system and cold air into the hot air coal pulverizing system is proposed so as to reduce oxygen content. At the end of the pulverizing system and medium temperature of the conveying system, dual-channel combustion burner is transformed into horizontal bias combustion burner. The measurement results show that 50% ratio of lignite blended in the 1025t/h bituminous boiler is feasibility. It is also an important technology to reduce NOx pollutant emission.

Insights into the provenance implication of leaf wax n-alkanes along the lower Yellow River

Serving as one of the largest rivers in terms of both sediment and organic carbon transport fluxes in the world,the Yellow River plays a crucial role in regional biogeochemical process as well as in the global carbon cycle.However,although a large number of studies have been carried out on the flux,composition,source and seasonal variation of total particulate organic carbon in the Yellow River so far,studies on molecular biomarkers at different spatial and temporal scales are still scarce.In this study,we focus on the molecular and hydrogen isotopic properties of leaf wax n-alkanes among different types of samples which obtained from different seasons(flood vs.non-flood)along the lower Yellow River.The molecular distribution of n-alkanes show that the riparian topsoils are subject to inputs from the overlying vegetation,while the suspended sediments from the flood season are characterized by the mixing of soil materials which originate from various stratigraphy with different ages on the Chinese Loess Plateau.Due to the contrasting hydrodynamic conditions,the n-alkanes in suspended sediments also show distinct molecular composition between flood and non-flood seasons.Additionally,considering the effect of climatic factors,the proportion of monocots in flood-season suspended sediments is calculated from a semi-quantitative perspective using δ^(2)H_(wax).Our findings may bring to light new considerations for the interpretation of leaf wax proxies in studies of organic matter sources of Yellow River.

Fluvial facies reservoir productivity prediction method based on principal component analysis and artificial neural network

It is difficult to forecast the well productivity because of the complexity of vertical and horizontal developments in fluvial facies reservoir.This paper proposes a method based on Principal Component Analysis and Artificial Neural Network to predict well productivity of fluvial facies reservoir.The method summarizes the statistical reservoir factors and engineering factors that affect the well productivity,extracts information by applying the principal component analysis method and approximates arbitrary functions of the neural network to realize an accurate and efficient prediction on the fluvial facies reservoir well productivity.This method provides an effective way for forecasting the productivity of fluvial facies reservoir which is affected by multifactors and complex mechanism.The study result shows that this method is a practical,effective,accurate and indirect productivity forecast method and is suitable for field application.

Bioengineering protection mechanism of city rock slope and its laboratory test

Based on the features of rock slope bioengineering protection,the ecology protection mechanism of the urban rock slope was discussed with the mechanics effect of plants and rock slope,and the reinforcement action mechanism of rock slope by plant root system was analyzed as well.Then,the corresponding mechanical model was proposed,from which the formula to calculate the increased shearing strength of the root system-earth compound body was derived.Moreover,the side slope rainfall interception,the runoff lagging,the soil antiseepage,and the soil layer consolidating effect were studied,respectively.Furthermore,the indoor model experiment of urban crag rock slope ecology protection was designed and completed,in which various grasses to plant in slope with different angles,solid earth forms,and the different strengthening earth mechanism were studied.Finally,the present method was applied in an engineering project,from which the antiwashing behavior of three kind of grasses(i.e.,the Bahiagrass,the tall fescue,and the Bermudagrass)planted in the slope with an angle of 38°,48°,and 58°,respectively,and different strengthening structures(i.e.,the diamond wire netting,the geocell and the threedimensional network)were obtained.The application results also show that the effect of geocell structure is the best one followed by the three-dimensional net and the diamond wire net.The antiwashing capability per unit area has a critical slope angle of about 25°.The reinforcing effect of Bermudagrass is better than the Bahiagrass and tall fescue.