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A fiber optic sensor for simultaneous measurement of temperature and strain is demonstrated, based on a few-mode solid-core photonic crystal fiber. In the core of the few-mode fiber, the fundamental mode and the first higher order mode are co-excited, when coupling light from a collapsed end, through a single-mode fiber. Mach-Zehnder interferences between the two core modes and one possible cladding...
Aiming at complex series product, the middle-structure modeling method based on features is put forward and the parametric design method is studied to realize the quick design and provide the digital model for latter simulation and manufacturing. Taking the 2K-V reducer as an example, the middle-structure model of the product is created, which can be transformed into the instance product through the...
We present and demonstrate a novel fiber Michelson interferometer based on cascaded twin core fiber (TCF) and side-hole fiber (SHF) for curvature measurement. The interferometer is fabricated by fusing the TCF and SHF. The interferometer can measure curvature and temperature by monitoring the wavelength change of interferometer spectrum. The experiment investigated sensor's spectral responses to the...
An in-fiber Mach-Zehnder interferometer (MZI) based on dual side-hole fiber (DSHF) was demonstrated for highly sensitive measurement of curvature. The MZI-based bending sensor is fabricated by fusion splicing a piece of DSHF in between two standard single mode fibers (SMF) with cladding alignment. Due to the existence of the two air holes and the asymmetrical cross-section of the DSHF, the DSHF-based...
This paper utilizes a new frequency hopping algorithm based on the long distance of wireless sensor network. Frequency hopping sequences will be controlled through the self-designed clock synchronization mode. By adding clock synchronous information within the network control commands, the energy consumption of clock synchronization can be reduced. We can control the frequency hopping sequences according...
This paper integrates hadoop with recommendation system. Recommendation system is a system which makes predictions of user preferences. In this paper, we introduces a improved hybrid recommended algorithm and combine MapReduce programming which is used on Hadoop plaform. Through practice, the improved algorithm can accurately acquiring user preferences, provide the user with recommendation when the...
Diabetes is one of the most prevalent diseases in medical field. We propose an ensemble method for diagnosis of diabetes on traditional Chinese medicine electronic nose signals. To evaluate the effectiveness of our method, we carry out the experiments by comparing single classifier with ensemble classifiers based on support vector machine and logistic classification model. The proposed method shows...
The content of nitrogen in water is an important index to measure water quality. In this paper, the model for the estimation of the total nitrogen concentrations in Liangzi Lake has been proposed based on grey system theory using HJ-1 CCD data and semi-synchronous ground referenced data, with the consideration of the spectral characteristics of water components. The model was used to calculate total...
The cost of cellulase is the main barrier of the production of the liquid bioenergy-the second generation of bioethanol. It is very important for the development of cellulase to study the regulation method of the nitrogen source in the liquid fermentation medium with Trichoderma viride. The results showed that the type of the nitrogen source, the amount, the ratio, the adding time of the inorganic...
The effect of the different substrate concentration, enzymatic compositions, varied chemical activators on the cellulase hydrolysis process was studied. The results showed that (1) the effect of the enzymatic hydrolysis was vital when the substrate was more than 5% (2) the enzymatic composition had much more effect ont the yield of cellulase hydrolysis (3) Mg2+, Co2+ had obvious effect in the low...
The bullwhip effect is the phenomenon of increasing demand variability in the supply chain as one moves from downstream echelons (retail) to upstream echelons (manufacturing). That is the volatility of the supplier's order (variance) is greater than the customer's demand (variance). Based on the data from Wind, from the perspective of the industry, we try to document the intensity and trend of the...
Along with the continual improvement of rural residents' living conditions, the passenger transport demand grows increasingly. However, the present backward vehicles, the traffic mode, the supervision system and the rural residents' consciousness of traffic safe can not adapt to the realistic demand of safe transportation under the current rural road condition; which makes traffic accidents show a...
As the development of telecommunication technology, the cognitive radio is considered to be an effective way, and become the research focus in the past years. At the same time, the Auction Channel Allocation Mechanism for cognitive radio system which is validated is an effective and convenient way to solve the problem in cognitive radio. In this paper we discuss the problems encountered in the Auction...
A compact Marx generator for 500kA two-electrode spark gap switch has been designed and constructed. The Marx generator can output a pulse waveform with 30ns rising time and 100kV peak voltage. Then, a series of simulations and experiments have proved that the output pulse waveform of the Marx generator matches totally the project requirements of the high-current spark gas switch. On the other side,...
Large cross-language lexicons involving hybrid terms emerge in various fields like e-learning educational materials. Some of their common properties make many traditional lexicon management mechanisms less efficient. In this paper, we propose a new method for the cross-language lexicon based on collaborative work of hash family and double-array trie and a prototype is implemented. Our experiments...
In this paper, the free vibrations of incomplete toroidal shells with different meridional boundary conditions are studied based on the linear Flugge thin shell theory. The cross-section of toroidal shells is assumed to be a closed circle. The circumferential modes are represented by a series of trigonometric functions and the meridional modes are expressed as a combination of beam functions which...
The component mode synthesis (CMS) technique has been widely used in engineering for its efficiency in dynamic analyses. The principle of CMS with fixed interfaces is introduced, the detail steps in calculation are summed up, and the flow chart of algorithm is also given. The dynamic properties of elastic tube bundles are investigated with the application of CMS. The effect of numbers of nominal modes...
Due to the development of radio service and the limitation of the frequency spectrum, spectrum multiplexing has been attached more and more attention. Spectrum Detection Technology is particularly important. This article has designed a weak signal detection system based on the Duffing oscillator which uses a two-level array detection algorithm to do fast detection. Then the article proposes a new...
Topology of power line carrier network (PLCN) is complex, fast changeable and its channel is time-variant. To enhance the availability and effectiveness of network communication, a cluster based dynamic routing algorithm (CBDR) is proposed in the paper. The algorithm adopts clustering based on root tree and local traversal in order to construct and maintain the dynamic routes according to trees topology,...
To fully use the ultra wideband (UWB) spectrum energy regulated by FCC, a optimum algorithm for UWB pulse design based on FFT has been proposed in this paper. The frequency expression of UWB signal has been firstly formed by the combination of different basis waveform, and then the UWB pulse can be easily obtained by IDFT on the frequency expression. This designed UWB pulse can achieve a satisfactory...
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