As exploration and development continue to expand, the number of high-temperature deep wells is on rise. However, instability cement slurry remains a significant technical challenge. The suspension agent represents crucial component in addressing poor settlement stability slurry. In response issues "thickening at low temperature," "high-temperature failure" "difficulty mixing slurry" associated with traditional agents, cationic hydrophobically associating liquid Suspension XFJ was prepared...

Soil conditioning technology is commonly applied to prevent mud caking and soil clogging in earth pressure balance (EPB) shield tunneling ensure continuous efficient construction highly viscous clay weathered mudstone strata. In the note, properties of agents their interactions are investigated through a series experimental tests field applications Changchun Metro Line 2, China. Tangential adhesion carried out learn strength torque change relationship between metal disk, by which effect...

Abstract Friction and wear are key issues in gear meshing. Lubrication, therefore, is used to reduce heat. The position direction of the flow lubrication determined by way nozzles injecting fluid texture on flanks teeth, both have an influence heat transfer. Furthermore, geometric characteristics tooth influences friction behaviour directly. This article presents investigations impact wear. A proposal prepare with arc shaped grooves made presenting manufacturing process. Different...

Abstract In order to enhance lubrication effectiveness and transmission efficiency in gear transmission, it is imperative minimize mechanical losses frictional wear of the gears during process. This paper proposes a bionic design scheme for tooth surface structure based on texture bay scallop shells, considering operational conditions within gearbox. Firstly, microstructure shell analyzed, mapping model established. Meanwhile, oil coverage rate convective heat transfer coefficient surfaces...

A new method named “permutation entropy” for detecting dynamical changes in time series was used to analysis the day-to-day temperature of north China from 1960a 2000a. We detected three abrupt climate mid-1970s and early 1980s. Further using Empirical Mode Decomposition decompose permutation entropy shows that approximate 10a cycle is most important. So we can draw conclusion suffered 1980s, moreover, induced directly.

The long range correlation of extreme events the Lorenz system is discussed by using method fixed threshold. It turns out that all with different threshold have correlation. scaling exponents are similar, but just smaller than original series. less effected initial value changes, it decreases distinctly when parameters increases. systems series has traits memory compared Gaussian white noise. Finally, we use maximal day air temperature data 194 stations between 1957 and 2004, from National...

Targeted delivery of coencapsulated drugs can increase therapeutic indices cancers including improved tumor inhibition and safety profile. However, most lack specific receptors (antigens) to guide the targeted delivery. Tumoral P-selectin be rapidly upregulated after ionization radiation, indicating it is a highly selective target for drug In this work, we had fucoidan, natural polysaccharide with intrinsic affinity toward P-selectin, chemotherapeutics cisplatin mitoxantrone coassembled into...

The conditional entropy of two symbolic sequences which are encoded faithfully from different time series is minimized at the zero relative shift if have their origins in same underlying dynamics. This technique also useful studying delayed coupling between series. Applications made to temperature data derived five meteorological stations China, namely Shanghai, Nantong, Changzhou, Nanjing and Hangzhou order test commonality dynamics, obtain strength dynamics variables, extract implicit information

We construct a complex network of the middle latitude circulation system north hemisphere (NCNH). The decadal characteristic leading teleconnection and its probable correlation with abrupt climate change are analyzed base on network. Results show that (1) action centres NAO, EUPA WP have all moved during different periods in recent 40 years there has been common process as end 1970s beginning 1990s separately; (2) new index which denotes importance is defined using node degree NCNH. temporal...

The complexity series of the logistic equation and Lorenz model were respectively calculated using a dynamical nonlinear analysis method for time series— —Lemper-Ziv algorithm, physical implication Lemper-Ziv co mplexity is also discussed. Results show that equation, com plexity obviously different when complicated degree i s variational; model, i.e. its x-, y-, z-portions, th eir complexities are all chaotic composed many cycles whose swings almost same lengths different. result reflects in...

The paper investigates the height and temperature fields reanalysis data of NCEP/NCAR by means detrended fluctuation analysis method, gives their scaling exponent distribution East Asia region. empirical investigation indicates that both field filed have property long range correlation, which matches with features space as a whole. As for grid same layer, correlation varies obviously when latitude changes. low-latitude areas near equator bigger better whereas mid-latitude high smaller worse...

By combining the detrended fluctuation analysis (DFA) method with surrogate data method, and using heuristic segmentation algorithm as well Chi-Square statistics, we develop a new to determine threshold of extreme events, e.g. stochastically re-sorting analysis(S-DFA) method. S-DFA obtain thresholds extremely low temperature events from 1961 2006 in China analyze their spatiao temporal characteristics distribution. We also validate effectiveness through event detection series. defining...

We develop a method to compute the segment size in detrended fluctuation analysis (DFA), which is based on basic concept of information theory, and verify effectiveness by numerical experiment. This freed from problem subjectivity former process choose usually leads false result. Change length sequence with dynamics being same, results remain stable. The indicate that when too short, even optimal selection not enough for portrait overall dynamic system, thus DFA cannot be used this...

This paper studies the long range correlation of return intervals extreme events using method percent threshold. In view events, range-correlations are studied by simulated time series when happened. It is found that constructed event also have characteristics long-range if original one. Meanwhile, scaling exponents two very close, it different from stochastic series. The probability density function with has significant difference was there a group-occurrence phenomenon in correlation, so...

Unconventional oil and gas reservoirs, especially that in tight formations, contribute great parts to the global energy. During drilling lost circulation was one of major problems, which can cause large amount non operation time millions losses. In order migrate problem, materials (LCMs) were used prevent reopening fracture by isolating tip while calculation stress intensity factor (SIF) width is key LCMs design. this paper, a dual porosity medium flow model suitable for formation...

In this paper,we studied the variation of granular composition,microstructure and strength seabed sediments under continuous wave actions contribution wave-induced fluidization to physical properties sediments.The silt sediment used in experiment was taken from modern Yellow River delta.The includes two rounds 5cm,10cm,15cm height.Undisturbed samples surface remould selected areas soil bed were for testing composition microstructure property variations before after liquefaction,and...

The complexity series of the Guliya (Tibetan plateau) ice core and Shihua cave (Beijing) stalagmite proxy records were respectively calculated in this paper, using a dynamical nonlinear analysis method for time series-Lemper-Ziv complexityalgorithm; physical implication Lemper-Ziv its meaning study climate change also discussed. wavelet resul ts show that there exist distinctive quasi-periods 780_, 380_, 160_, 105_ year series. Further investigations indicate when differ ent window lengths...