Severe short-pitch rail corrugation was found to have occurred on four types of track the same metro line. Field investigations that, even with operation conditions, corrugations had different wavelengths for track. Impact hammer tap tests were conducted investigate dynamic behaviour tracks. The test results showed in investigated metro, are associated resonance also that tracks not caused by torsional vibration due wheelsets. Numerical simulations identify is could be observed impact...

The first detailed examination of non-aqueous capillary electrophoresis with electrochemical and electrochemiluminescence detections (NACE-EC/ECL), separation parameters their interactions via central composite design was presented. This concept demonstrated by examining the optimization conditions seven antihistamines (chlorpheniramine, cyproheptadine, diphenhydramine, doxylamine, methapyrilene, terfenadine, triprolidine) NACE-EC/ECL. To evaluate NACE quality, chromatography resolution...

Region-specific gut spheroids are precursors for gastrointestinal and pulmonary organoids that hold great promise fundamental studies translations. However, efficient production of remains challenging due to a lack control mechanistic understanding spheroid morphogenesis. Here, we report an biomaterial system, termed micropatterned generator (μGSG), generate from human pluripotent stem cells through mechanically enhanced tissue We show μGSG enhances the biogenesis independent micropattern...

Inspired by the basic theory of Fruit Fly Optimization Algorithm, in this paper, cat mapping was added to original algorithm, and individual distribution evolution mechanism fruit fly population were improved order increase search speed accuracy. The flowchart algorithm drawn show its procedure. Using classical test functions, simulation optimization results that has faster more reliable ability. then combined with sparse decomposition used processing fouling detection ultrasonic signals...

Knowledge of population structure is particularly important for long-term fisheries management and conservation. Lesser-spotted leatherjacket Thamnaconus hypargyreus an economically fish species in the South China Sea. Fish specimens (totally 158 individuals) used this study were collected from five geographical locations north Sea southwestern Nansha Islands. The results as follows: a total 636 nucleotides mitochondrial DNA (mtDNA) control region (CR) T. amplified by polymerase chain...

Ultrasonic time-domain reflectometry has the advantages of real-time and accurate detection fouling in heat exchange tubes, but owing to complex environment, received ultrasonic is noisy, there are problems such as mutual interference between echoes. This article presents a new method for sparse decomposition based on selecting atomic dictionary with high degree matching. The imperialist competitive algorithm (ICA) used optimize search process matching pursuit. Additionally, global...

We simulate pulse shaping of bright–dark vector soliton pair in an optical fiber system. Through changing input parameters (amplitude ratio, projection angle, time delay, and phase difference), different kinds shapes spectra can be generated. For with the same central wavelength, “2+1”- “2+2”-type pseudo-high-order pairs are achieved. While for case wavelengths, multiple peaks/dips demonstrated appropriate parameter setting.

Adopting effective routs to control the precipitation and size of nitride inclusions in superalloys during solidification is a very interesting subject for metallurgists. The behavior K418 alloy under continuous unidirectional process was investigated by scanning electron microscopy, ASPEX Explorer, LECO ONH-836. results show that there were two types ingot: TiN complex inclusion Al2O3–TiN. There gradient distributions number density, average max sizes along casting direction, as well...

The accuracy of the gravity corrections is limited by ability to survey near-station topography. By now, regional terrain still rely on traditional high field survey, which inefficient and expensive. In this paper, we explored an alternative way using resolution satellite stereo-photogrammetry for gravimetric corrections. proposed approach, geoeye-1 stereo pair images with rational function model were used obtain precision density digital models near points. Meanwhile, a differential...

Intelligent optimization algorithms have now become important means for solving global problems. The imperialist competitive algorithm (ICA) is a nature-inspired meta-heuristic that imitates social behavior. ICA has been widely used in problems, however, tends to fall into local optimal solution because of its fast convergence speed, which may lead premature when To solve these new improved proposed. Based on the original algorithm, theory spiral rising introduced enlarge search space and...

A silver doped polyglycine modified electrode was prepared by cyclic voltammetry. The electrochemical behavior of epinephrine at the studied. novel method for determination using voltammetry established. In pH=4.0 phosphate buffer solution, gave an anodic peak which can eliminate interference ascorbic acid and dopamine to determination. potentials were Epa=0.399V Epc=0.375V (υs Ag/AgCl). current versus concentration showed a linear relations over range 5.60×10-7mol·L-1~1.00×10-4mol·L-1 with...

In heat exchange fouling ultrasonic testing, the time-domain signal waveform often contains high aliasing due to small thickness or order echo interference, and so forth. This paper studies method of acquiring time flight from testing with presents that combined Wiener deconvolution cumulative spectrum estimation. For reference distortion problem, which may exist in real application, an iterative correction process is introduced form Incremental algorithm. Simulation experimental results...

Cyclic codes are a subclass of linear and have applications in consumer electronics, data storage systems, communication systems as they efficient encoding decoding algorithms compared with the block codes. The objective this letter is to present family p-ary cyclic length $\frac{p^m-1}{p-1}$ dimension $\frac{p^m-1}{p-1}-2m$, where p an arbitrary odd prime m positive integer gcd(p-1,m)=1. minimal distance d proposed shown be 4≤d≤5 which at least almost optimal respect some upper bounds on code.

Botryosphaeriaceous fungi are an important ascomycete group (Botryosphaeriales, Dothideomycetes, Pezizomycotina, Ascomycota).They play essential roles in economic and ecological environments, especially agroforestry ecosystems.In this overview, we introduce a wide variety of functions botryosphaeriaceous fungi.The taxonomic studies the family Botryosphaeriaceae its early stages have been reviewed details since 1823, two major classification systems proposed by von Arx & Müller Barr.The...

The Rayleigh wave testing method is one of the in-situ nondestructive tests, which theory quite mature, and it characterized by portable equipment, well operability fast detection speed. So can greatly improve efficiency compaction highway embankment, especially has incomparable advantage for quality monitoring earth-rock filled or rock embankment. In paper, analysis field result rock-filled obtained velocity researched relationship dry density, porosity. fitted formulas between density...