Generally, four three-axis magnetometers (TAMs) are used to measure magnetic gradient tensor. But the measurement precision of magnetic gradient tensor is tightly connected with the imperfect performance of sensors such as non-orthogonality, different scale factors and biases among sensitive axes, misalignment between different TAMs. It is necessary to calibrate and correct the measurement device to obtain precise magnetic gradient tensor. A mathematical model for calibration of the device measuring magnetic gradient tensor is established, and the calibration algorithm and its steps based on functional link artificial neural network (FLANN) and least-squares method (LSM) are proposed. The numerical simulations prove the effectiveness and good convergence of calibration algorithm, which can improve remarkably the measurement precision of magnetic gradient tensor.
The application amount of fertilizer and pesticide overall showed rising trends in Hainan. The excessive application of chemical fertilizer and pesticide can cause higher production costs and greater pressure on the ecological environment. The sown area of cucurbits and vegetables showed an increasing trend to a certain extent, safety and pollution-free production of cucurbits and vegetables has become one of the principal contradictions restricting the development of cucurbits and vegetables in Hainan. In this study, the ecological cultivation system of cucurbits and vegetables was constructed combining ecology, ecological economics, and vegetable cultivation principles, which had an important significance for maintaining ecological balance and sustainable development of agriculture.
KEYWORDS: Genetics, Agriculture, Statistical analysis, Life sciences, Taxonomy, Ecotoxicology, Communication engineering, Current controlled current source, Silica
Inter-simple sequence repeat (ISSR) markers were used to measure the levels of genetic variation and patterns of population structure within and among five extant populations of Brasenia schreberi, an endangered aquatic plant in China. Six primers selected from sixty ISSR primers were used in the study which amplified 49 reproducible bands with 22 (44.9%) being polymorphic, indicating low levels of genetic diversity at the species level. AMOVA analysis revealed that most genetic variation (85.64%) is present among populations. The low level of gene flow (Nm = 0.1) is estimated among five remaining populations. A Mantel test show significant relationship between genetic distance and geographic distance (r = 0.91). Several factors including clonal growth, habitat fragment, population isolation, restricted gene flow among populations and agricultural practices, might have played an important role in maintaining the genetic structure of B. schreberi populations in China. In view of the limited genetic information currently available for B. schreberi, we recommend in situ preservation of the remaining population.
The preparation of a ferrous chelate of hairtail (Trichiurus haumela) protein hydrolysate (Fe(II)-HPH) and its antibacterial activity were studied. The optimal conditions of hydrolysis by papain and ferrous chelation were obtained by single-factor experiments and orthogonal test, with the antibacterial activities as the index. In addition, the antibacterial activity of Fe(II)-HPH was evaluated using the Plackett–Burman design. The orthogonal test results showed that Fe(II)-HPH had an antibacterial activity of 98.3% under a temperature of 40 °C at pH 6.5 for an enzymolysis duration of eight hours in the presence of 20,000 U/g of enzyme. The Plackett–Burman design analysis showed that the three most significant factors (P < 0.05) influencing the antibacterial activity of Fe(II)-HPH were pH, the concentration (mg/mL), and presence of magnesium sulfate.
KEYWORDS: Geographic information systems, Telecommunications, Environmental monitoring, Data communications, Databases, General packet radio service, Data centers, Wireless communications, Data acquisition, Visualization
To solve the problem on remote data real-time transmission and the analysis and management of the data in the agricultural environment monitoring, we had a detailed study of the principle of wireless communication SMS/GPRS and the technology of seamless integration with GIS. The system achieved the wireless real-time transmission of remote monitoring data by the SMS/GPRS technology and used the GIS visualization technology to display monitoring data visually. With the aid of the function of GIS spatial analysis the system analyzed the geographic area. The software system structure and key technologies had been solved. The system is suitable for departments of agriculture to acquire and communicate the environmental monitoring data, to manage the GIS, and to analyze the decision.
KEYWORDS: Humidity, Light emitting diodes, LED displays, Sensors, Surveillance, Temperature metrology, Temperature sensors, Lithium, Signal processing, Software development
The control to temperature and humidity of small civilian granary is great important to grain storage. In this paper, we propose a smart surveillance device to monitor temperature and humidity in real-time to ensure high quality food storage. This simple and small size device could achieve good anti-jamming at extremely low power consumption. It could automatically trigger the sound-light alarm when either temperature or humidity is higher than a preset threshold value.
KEYWORDS: Roads, Data mining, Detection and tracking algorithms, Data acquisition, Chemical elements, Data modeling, Databases, Inspection, Mathematical modeling, Electronics
The route relationship matrix M is employed in this paper to indicate relationship between routes. The travel solutions for bus stations are obtained by matrix operation. Through the data mining to the history record of transportation information, the road transportation status at specific time interval can be predicted. Based on the predication, the best travel solutions can be found. The algorithm fully uses history transportation information, optimizes the travel solutions according to the time consumed. It can satisfy the time requirement of traveler and is very useful.
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