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Modifications of red mud for activating available silicon (Si) by phosphates were carried on in this paper. And then the modified red mud materials were used to stabilize Cd in an ore soil. Results indicated that phosphates efficiently increase the content of available Si in red mud. In the stabilization, exchange Cd was decreased by 90.97% when using 5% potassium dihydrogen phosphate modified red mud, which was better than using raw re mud as the decrease was 77.08%. In rice pot soil, increases of residue Cd were positively correlated with the increases of available Si (P

Since Creative Economy has already revealed its importance for the first time after Agricultural Economy, Industrial Economy and Service Economy, creative distribution deriving from Creative Economy has also stepped into public arena. Through the way of equal emphasis on technology and management, this paper studying into the main features of creative distribution modes of terminal logistics, such as information network, individual space and technological standard and so on, analyzes main constituent elements far and elaborately designs personalized service space, network interactive platform and standardized operation modes of creative distribution mode.

This research probes into the application of knowledge based engineering (KBE), including acquision, expression and deduction of design knowledge, in rapid design system. Following the concept of modular design and in accordance with the characteristics of machine tool design, it develops a rapid design system for modular machine tool. The design flow of this system is dominantly top-down. It can inherit and reuse design knowledge and realize rapid design of modular machine tool. System development platform and development tools are introduced in this paper. The system’s efficiency and quality are illustrated by a case design.

The concrete used in transmission lines are basically for foundations. The foundation concrete of transmission lines in corrosive environments has shown serious deterioration, which usually caused by concrete deterioration, rebar corrosion, degradation of bond strength between rebar and concrete due to various corrosive effects. Field tests are carried out in Wuhu area to research the durability of foundation concrete of transmission lines. And test results show that the concrete strength in the air is a litter higher than underground and the carbonization depth at the windward side is the largest of each foundation and the leeward side is the smallest, while those underground are close to zero.

In order to learn the reaction and adaptability to water stress of Sedum yvesii, the changes in physiology of leaf water saturation deficit (RWD), plasma membrane relative permeability, chlorophyll content and fluorescence parameters were studied in different moisture gradient of water stress. The results showed that: after 20 days for submergence stress, it had an effect on the normal growth of Sedum yvesii; after 30 days for severe drought stress and 10 days for extreme drought stress, it can severely inhibit the growth of Sedum yvesii, even lead to death, which embodied in the dramatic decline of chlorophyll content, Fv /Fm, Fv'/Fm', ETR and the increase of RWD, relative electrical conductivity. The indicators of slight drought stress and moderate drought stress group have little differences with the control group. They did not cause a significant effect on the growth of Sedum yvesii, indicating that Sedum yvesii has a strong ability to these two kinds of water stress gradient.

Segmentation of diseased lungs in CT images is a nontrivial problem. As Active Appearance Model (AAM) has been applied effectively in this field, we propose a new approach for the construction of traditional AAM to segment the lung fields more accurately and efficiently: Matrixes based AAM (MatAAM). MatAAM is based on two-dimensional image matrixes rather one-dimensional vectors. Its appearance matrix does not need to be transformed into a vector prior to computing the appearance parameter. Instead, a covariance matrix is constructed directly using the normalized appearance matrixes and its eigenvectors are derived for the appearance parameter. The experiment results were compared to other landmark-based methods: Snake, Active Shape Model (ASM), AAM and several modified versions of them. For segmentation of lungs especially diseased lungs, MatAAM performed a superior result in both precision and efficiency.

This article selects the typical carving stone as the research object. We make an discuss about the factors affecting the effect of seal cutting art of using saber from the perspective of petrology through the conditions of seal cutting stone material, color, hardness, transparency and so on. Making an analyze about the adaptability to seal cutting stone and the stone material impact bit broken seal treatment , in order to select material of seal cutting lovers with reference.

High-pressure abrasive water jet cutting is a cold and non-traditional method, with many advantage which the traditional processing do not have.The traditional method of cutting marble have rough sections, poor dimensional accuracy, large seam, high tool cost and the processing efficiency is low. Can be considered high-pressure abrasive water jet cutting to improve its traditional cutting defects. This article explores the use of the pre-mixed abrasive water jet cutting in the marble, and its comparison with traditional methods, highlighting the advantages which the pre-mixed abrasive water jet cutting in the marble.

Because of the poor quality of the operational water (urban reclaimed water) of one power plant in Hebei, China, a high-efficiency reverse osmosis (HERO) system with foreign patents is utilized for advanced treatment of the reclaimed water. The influence of the main factors (including the alkalinity and the suspended solid content of the feed water, the flux, and the pH of the concentrated water) on the performance of the HERO system were studied. The high alkalinity (high concentration of carbonate) of the feed water resulted in HERO scaling, and the low alkalinity caused the penetration of hardness through the weak acid ion exchangers and, therefore, also caused HERO scaling. The high suspended solid content of the feed water caused rapid decrease in the product flux of HERO. The low concentrated water flux also decreased the product flux. As the pH of the concentrated water became higher, the stability of the HERO operation increased. Based on the pH endurance of the membranes and the characteristic of the high-pH operation of the HERO system, the water production was basically stable when the pH of the concentrated water lay between 10.5 and 10.8. Affected by the ammonia in the reclaimed water, the pH of the product water was higher than that of the feed water. The pH of the feed water was higher than that of the concentrated water. When the pH of the concentrated water was above 10.8, the pH values were close to one another. The results of the chemical cleaning experiments indicated that hardness, phosphorus, ammonia, silicon dioxide, and iron ions were the main influencing chemical factors of HERO, in which the former three formed a sediment of magnesium ammonium phosphate, and the latter two formed an iron silicate sediment.

Astronauts will suffer the orientation transformation problem without external force condition in spaceflight mission. Based on the establishment of human body system dynamics equation, the recommended control methods are put forward to guide the astronauts to make their orientation changed. The movement process is simulated through use of ADAMS to confirm the feasibility of method. Finally, simulated weightlessness environment is developed to demonstrate the advantages of the recommended control method compared with other control methods. The results show that using the control methods developed in this paper will make astronauts spend less time and smaller joint torques in performing body rotation about single axis in simulated weightlessness. There has certain reference significance for astronauts to conduct orientation transformation in spaceflight.

Al2O3/PVDF-HFP based polymer electrolyte was prepared by the phase transfer method with different mass ratios of organic solvent and non-organic solvent. The solid polymer electrolyte was characterized by means of SEM, FTIR and AC impedance methods. The results show that the optimum mass ratio of organic solvent to non-organic solvent is 1:0.3 and the optimum mass ratio of Al2O3is 7%. The liquid absorption rate of the polymer electrolyte is 225%. The lithium ionic conductivity of the polymer electrolyte at room temperature is about 1.75×10−3S·cm-1, and the LiCoO2/Al2O3/PVDF-HFP/Li cell has good cycle performance.

By analyzing the control principle of power system stabilizer (PSS),shows that the robustness of PPS is not ideal. Using the methods of state-space pole placement designed the governor-side power system stabilizer GPSS,and built a simplified model of the power system with simulink. The simulation experiment results made ​​in the MATLAB shows that GPSS has good inhibitory effect of low-frequency oscillations.

To characterize the concentration levels of PFOS and PFOA in the Qiantang River waters of China, 12 water samples were collected in May 2013 and analyzed. The concentrations of PFOS and PFOA were from n.d to 0.798 ng/L and from 65.9 to 102.4 ng/L, respectively. PFOS has been observed at a low concentration in these samples, while PFOA was detected in 100% of the samples with higher PFOA concentrations. PFOA concentrations were far higher than those of PFOS in all the samples, which subjected to be influenced by the inflows of the chemicals from a lot of the textile dyeing industry along the south bank of the river. Although the PFOS and PFOA concentration in Qiantang River water samples did not exceeded this provisional health advisory level (limit) established by the United States Environmental Protection Agency for PFOS and PFOA in drinking waters of 200 ng/L and 400 ng/L respectively, continued exposure to even relatively low PFOS and PFOA concentrations in drinking water may increase the risk of health effects.

Due to the complex geological conditions of Nanshan mine east region, the outburst predict index overrun frequently in the process of high-dipping extremely thick coal seam rock cross-cut coal uncovering, this text designed and optimized the front explore borehole parameter to ascertain conditions of coal seam; Optimized gas drainage drilling parameters to improve the rate of extraction, reduced the blank tape; On the basis of the theory of mechanics, derivate the computational formula of minimum safety rock pillars, identified with the minimum thickness safety of rock pillars. Through the above measures, guaranteed debunking coal seams quickly and safely.

In order to reduce the danger of single coal seams outburst during the tunneling in coal roadway and ensure the tunneling of coal seams, this text analyzed the mechanism of crossing drilling against outburst; studied the area measures of floor tunnel crossing and grid drainage boreholes in coal roadway, Designed and optimized the drilling technical parameters; Analyzed the relationship between the drainage concentration and scalar; Calculated the maximum overlying coal seam gas to spare scalar quantity is 224300 m3 ;Used a variety of indicators to investigate the effect of outburst prevention. It shows that Gas content and gas pressure have significant lower than drainage. After the drainage up to standard, all the sensitive indexes is not overrun, during the coal roadway tunneling, it does not appears dynamic phenomenon. Solve the problem of mining imbalances, guaranteed the safety driving of roadway.

Due to lots of the precious Chinese herbal medicines are on the edge of exhaustion, the paper presents a real-time monitoring system based wireless sensor network in order to protect Chinese herbal medicines and do artificial cultivation. Temperature, humidity and light condition is very important to the growth of Chinese herbal medicines growth. How to scientifically adjust the environment parameters is essential, it’s benefit for Chinese herbal medicines to improve the yield and quality. According to herbal medicines environmental characteristics, sensor networks were designed which the data can be accurately collected so as to track and monitor environmental factors of grow influence in real time or continuous. The system gives the hardware design of wireless sensor node and software implementations. Wireless sensor network nodes communication circuit was designed by CC2430, monitor environmental parameters with air temperature and humidity sensors and light intensity sensors. Experimental results show: the sensor network monitoring system can make the artificial cultivation of the medicines more modern, scientific and objective.

In order to solve the problem of ignoring items’ attributes in single criteria collaborative filtering recommendation algorithm, a collaborative filtering recommendation algorithm based on multi-criteria decision making was proposed. Multi-criteria decision making was used during the computing of users’ similarity in the algorithm. By averaging all the similarities of sub evaluation with their weight, the algorithm chose the nearest neighbors. Finally, the algorithm used several nearest neighbors to get the recommendation results. Experiments show that the algorithm can find the nearest neighbors more similar after detailing evaluation, and make better predictions for the target users.

Kinect, as an individual feeling surrounding peripherals, not only changes the users' entertainment experience, also provides a new way between users and machine interaction. Using easily and improving the gesture recognition accuracy, the paper presents a method that a device sensors are used to get the more than 20 joint point information, and a specific position is distinguished by the Euclidean distance and Angle of each joint point. The result shows that the recognition rate is higher using the method to identify the position and extension action library is used to meet the needs of determining different positions at any time. On this basis, the paper has been implemented in various fields or carried on the beneficial exploration of possible application.

In this paper, The problem of estimating unknown paramaters of Lomax distribution is considered under the assumption that samples are type-II censoring. The maximum likelihood estimates are developed for unknown paramaters using EM algorithm and NR method. We obtain the observed Fisher information matrix using the missing information principle . A numerical study is performed to compare the proposed estimate.

The dynamic quantitative weighing system based on the buoyancy weighing sensor is designed in this paper. At first the principle of the dynamic quantitative weighing system is analyzed and then the mathematical model is established. Secondly the hardware structure of the dynamic weighing system is designed. The buoyancy weighing sensor is introduced. The weighing system is composed of two parts: the buoyancy equalizer and the displacement sensor. Through the field tests, precision, stability and sensitivity of the device has been verified.

One method named image synthesis was proposed for gray image composition to meet the requirement that algorithm research of machine vision needed a lot of images. Firstly, two modules, i.e., modeling module and camera module, of some engineering software were compared and images will be obtained by using three-dimensional modeling software cooperating with VRay plug-in. Then, parameter setting and adjustment for VRay plug-in was studied. Lastly, measurement experiments were carried out by using synthetic images. The experimental results demonstrate that 1μm measuring accuracy is possible under the condition that the distance between calibration part and camera was equal to that between parts and camera. The synthetic images can be used for algorithm research of machine vision.

Hydraulic free-piston engine is a compact machine which is composed of a conventional engine and a hydraulic pump. Compared to the conventional technology, the free piston engine has many potential advantages. In this paper, a simulation model for a single piston hydraulic free-piston engine (SPHFPE) is described, and the differences in motion characteristics between the free-piston engine and the conventional engine are presented. And varying piston mass and starting pressures have an impact on the motion characteristics of the free-piston engine.

To provide the quality assurance for various samples test, fast testing methods of the performance of laser confocal micro-Raman spectroscopy system for cell analysis are developed. The silicon wafer was used on the performance test of LabRam INV system produced by Horiba JY. The silicon wafer can not only be used for system calibration (the band of 520.7cm-1), but also for the evaluation of the system performance. The curves of the intensity at the band of 520.7 cm-1 as a function of laser intensity radiated on the sample, pinhole and time were achieved. The results show that the intensity at the band of 520.7 cm-1 change linearly with the laser intensity, which can be used to evaluate the laser intensity radiated on the sample. The intensity changes with pinhole can be used to determine the size of pinhole for different purpose. The stability of Raman system can be determined by the variation of the intensity at the band of 520.7 cm-1 with time, which helps to decide whether it is suitable for other sample test.

A 1000MW ultra-supercritical unit was studied to gain the energy consumption characteristics by means of thermodynamic analysis. Comparing with the designed conditions, the power generation efficiency under real operation is much less; especially under 50% and 100% rated loads. The higher superheated steam temperature and lower reheat temperature were found to explain that. At the real running, the higher superheated steam temperature induced more attemperation water, while reheat temperature lower than the designed point would decrease the power output. Aiming at solving issues about temperature control in unit operation, several details could be paid extra attention to. For instance, attemperating water comes from outlet of the high-pressure heaters would have a much slighter influence on generating efficiency.

A PLS-SVM method is used in order to improve the performance matching of Marine Supercharged Boiler and Turbocharged set. Value of key parameter of processing control is reconstructed through out of historical operating data. The traditional way of parameter reconstruction is theoretical calculation, which cannot solve the problem caused by performance degradation. Experiment shows that the PLA-SVM method could lead to a more accuracy and efficient results.

City management has been brought significant challenges by urban population increasing, for example, urban transport, environment, water resource, residents medical treatment and so on. Take full advantage of information technologies, manage city operation in an integrated and systematic mode, to coordinate the various functions of city, provide quality service and unlimited innovation space for enterprises, higher quality of life for residents. Based on interconnect, collaborative and wisdom, the smart city is a new thinking path for exploring future urbanization and a new concept for promoting post-modern city construction. From the perspective of system engineering, comprehensively analyzed system architecture of smart city, soft environment construction, city construction dimensional model, evaluation indexes, causal analysis diagram and evaluation flow chart to provide a reference thinking path for the smart city construction and development. At the same time, the future research direction of the project were given, they were how to mine big data from smart city operation, construct organization and operation mechanisms of smart city.

The authors have investigated the edge emission of microcavities which are formed by low-molecular organic light emitting diodes sandwiched between dielectric mirrors and the metal cathode. The edge emission relative to the surface emission is found to significantly depend on the layer number of alternating high and low refractive index films in dielectric mirrors. The enhancement of cavity devices can reach a factor of ~3.0 compared with noncavity devices. Spectra of organic film pumped by edge emission of microcavity devices have been observed, a mechanism of achievement of an amplified spontaneous emission has been discussed theoretically.

The core drilling method is used for testing the concrete strength of the cast-in-place piles during the construction of a power plant. The concrete strength of some cast-in-place piles is far lower than the normal expected value. The incorrect construction sequence is the main cause of the quality problem. It is inadvisable to shorten the time limit for a project while ignoring the project quality. The more time will be spent to solve the quality problem of the project after the construction is complete. The construction organization is important for the quality of the projects and the reasonable construction sequence can improve the project quality.

In the study, the solid-phase microextraction (SPME) and gas chromatography and mass spectrometry (GC-MS) were used for identifying and analysising the volatile compounds of jackfruit (Artocarpus heterophyllus L.) fresh peel (FE) and fresh pulp (FU). The result showed that it was apparent differences of the species and quantities of volatile compounds between peel and pulp. 2,3-Butanediol, Butyrolactone, 1-Methoxy-2-propyl acetate, Butanoic acid, 3-methyl-, butyl ester, n-Amyl isovalerate, n-Hexadecanoic acid were found in peel and pulp. While compounds, such as Geranylgeraniol, Lanosterol, Pentanoic acid, 3-phenylpropyl ester, Phthalic acid, butyl 3-methylbut-2-en-1-yl ester, Hexadecanoic acid, methyl ester, were only present in the peel. But in the pulp, compounds, like Dibutyl phthalate Phenol, 2,4-bis (1,1-dimethylethyl)- henols were confirmed, which did not be found in the peel. The experimental result also indicated that SPME-GCMS is a simple, rapid, reliable and effective method to analyze the volatile fraction in jackfruit. It may have as profound an impact on analysising the volatile compounds of jackfruit.

Because its pilot stage is a two-position tree-way valve, the previously research piezoelectric type pneumatic digital valve also constantly works in on or off state even in the case of output stable pressure, which makes the valve with pressure fluctuation, waste gas and other shortcomings. In order to overcome the above problem, a novel pneumatic digital valve driven by dual piezoelectric is presented in this thesis. And its simulation model is built based on the AMESim and Matlab/simulink joint simulation platform. On this basis, its control method is researched by the simulation. The simulation shows that the Bang-Bang and the PWM control algorithm can basically achieve the digital proportional control of the valve, but the valve has overshoot. For this, the compound control algorithm with PID plus PWM is proposed to control the valve. The simulation results show that this algorithm is effective which can reduce the pressure overshoot.

Power marketing in the United States, Europe, Japan and other developed countries has entered the era of intelligent and networked. Domestic power marketing system means more backward, and the marketing organization system is imperfect. With the intensified competition of market, the Tianfu Thermoelectric original marketing information systems cannot satisfy the development needs of the enterprise, which lacks of top-down overall informatization construction planning and scattered IC cards. According to the current operating status of the joint stock company and existing problems, the establishment of an integrated marketing platform with electricity, heat and gas business is built on a unified infrastructure platform in order to unify customer information, marketing basic platform capabilities and customer service platform function, centralize management of electricity, heat, gas marketing business in one of a big marketing intensive management mode including electricity, heat and gas.

The electric power industry is the largest CO2 emitting sector in the national economy. So optimize the power structure is an important part of energy conservation. This article selected the data of power supplydemand and the power structure in Hebei Province from 2004 to 2011 on the basis of the analysis of the power structure. It established a short-term prediction model based on gray theory, and made the power supply and demand situation and the power structure prediction of Hebei province in the next five years, and provides a reference for the scientific development of the power structure optimization of Hebei Province in the low-carbon context.

It is an issue whether the Kaijiang-Liangping area (in the northeastern Sichuan Basin, SW China) was a controversial ocean trough during Changxing age in the late Permian-early Triassic. Some vitrinite reflectance (Ro) profiles from wells in the northeastern Sichuan Basin show obvious breaks, and the breaks are coincident with the boundary between the middle Permian and late Permian. Based on the Ro data, the heat flow history in the northeastern Sichuan Basin was reconstructed. The result shows that the heat flow reached its peak value at the end of middle Permian (~260Ma). The spatiotemporal feature of the heat flow evolution is not in agreement with the fact that there was a Kaijiang-Liangping Trough existing in the late-Permian to early Triassic. The palaeo-heat flow anomaly was, in fact, a response to the igneous activity in late middle Permian.

A de-interlacing method for video surveillance in intelligent substation is presented in this paper. Firstly, a framework for performance evaluation is proposed so that the subjective performance of de-interlacing will not matter in applications such as video compression. Then pre-filtering is performed to remove potential noise, and a hierarchical structure is introduced for same-parity field pictures or opposite-parity field pictures to get more reliable optical flow results for compression. Finally the optical flow results are used to improve the accuracy of block-based methods for each partition of the to-be-interpolated image and the final motion vectors are determined. Experimental results show that the proposed solution can achieve both better peak signal-to-noise ratio (PSNR) performance and visual effects.

Based on quantitative structureproperty relationship (QSPR) of organic compounds, geometrical optimization and quantum chemical parameter calculations have been performed at the B3LYP/6-31G* level of theory for 75 polychlorinated naphthalenes (PCNs). A number of statistically-based parameters have been obtained. Relationship between the physicochemical properties of polychlorinated naphthalene compounds (n-octanol/air partition coefficient, sub-cooled liquid vapor pressure, water solubility) and the structural descriptors have been established by multiple linear regression (MLR) method. The results show that the molecular volume (Vmc), dipolar moment (μ), and the energy of lowest unoccupied molecular orbital (ELUMO), together with the quantity derived from electrostatic potential () can be well used to express the quantitative structure-property relationships of polychlorinated naphthalene compounds. The models constructed have good robustness and high predictive capability.

The purpose of this study was to isolate citral from sweet orange oil by combined usage of molecular distillation and column chromatography. Additionally, the antioxidant activity (by DPPH radical scavenging activity and reducing power) of citral was evaluated. A significant and linear correlation coefficient between the antioxidant activity and the concentration of citral was found (R2=0.9925). On the other hand, the cytotoxic effects of the citral against tumoral human cell line Hela was examined by MTT assay and the IC50 values was 32.56 μg/mL. Overall, results presented here suggest that the citral possesses antioxidant activity and cytotoxic properties, and is a potential source of active ingredients for food and pharmaceutical industry.

With the increasing strictness of emission regulation, the requirements for marine diesel engine SOx emission are becoming more and more rigorous. This paper mainly introduces the reaction mechanisms of seawater scrubber and freshwater scrubber, and analyzes the research status quo of the two scrubbers. It also gives a contrast to the merits and shortcomings of them. Finally, this paper puts forward some considerations in the practical application of seawater scrubber on ships.

NOx is one of the most serious atmosphere pollutants, and how to control and remove NOx is the hot research in the environmental field all over the world. SCR is considered as one of the most effective denitration methods at present. In SCR technology, catalyst is the core of the SCR system, and the performance of SCR catalyst mainly depends on the active component and catalyst support. Catalyst support can not only affect the choice of the active material and the catalyst promoter, but also affect the flue gas denitration efficiency. This paper mainly introduces four kinds of SCR catalyst supports: TiO2, Al2O3, activated carbon and activated carbon fiber and ZSM-5 zeolite. The performance of the four types of catalyst supports are compared, and SCR activity test of Mn-Ce supported and V2O5 supported on different catalyst supports are conducted respectively. Finally, for Mn-Ce supported and V2O5 supported catalysts, this paper puts forward that TiO2 is the most widely used and effective catalyst support.

This paper introduced a measuring soil sample triaxial volume displacement system that used position sensing detector.The system course of principle and development was maken a detailed statement. The study was carried through literature [12] existing shortcomings. The shortcomings of former system was mended in the new system .This system had a high measuring precision and reasonable design. This systems triumphantly developed will be applied in triaxial specimens local sheared and port restriction .This system have greatly applied foreground to study deformation localizing , come into being cut strip and measuring volume change of unsaturated soil.

The aim of the study was to investigate bamboo shoots protein extraction. A Box-Behnken design (BBD) was applied through the Response Surface Methodology (RSM) to determine the effects of pH, temperature and solid-liquid ratio during Phyllostachys pubescens bamboo shoots protein extraction. Regression analysis was applied on the data obtained. The more relevant variables were pH, liquid-solid ratio. The coefficient determination (R2 = 0.9258) was good for the second-order model. Maximum yield was 10.77±2.28% obtained when pH, liquid-solid ratio, temperature and extraction time were 12, 32.24, 46.12°C and 20 min, respectively. The result was help to design the process of optimal protein extraction from Phyllostachys pubescens bamboo shoots.

In order to prepare polysulfone (PSF) hollow-fiber ultrafiltration (UF) membrane with ideal hydrophilicity, TiO2 nanoparticle was introduced to casting solution. Furthermore, the effect of TiO2 nanoparticle concentration on structure and performance of membrane were investigated. It was found that with the addition of TiO2 nanoparticle, the structure and performance are influenced obviously. With the increase of TiO2 concentration, the porosity increase, the tensile strength and fracture length have maximum values when TiO2 concentration is 1 wt%. The water flux increase obviously and the retention rate decrease slowly with the increase of operating pressure, considering water flux and retention rate of the membrane, the best operating pressure is 0.2 MPa.

The main inlet component of steam turbine is control valve. The stable operation of the steam turbine control valve is vital for safe and stable operation of the steam turbine and safety production of the power plant. However, due to the complexity of the structure and unsteady characteristics of steam flow in the valve, there is not enough experimental method about the detailed flow characteristics of the area near control valve disc and the inside of the valve chamber up to now. This article is to focus on the simulation of the steam turbine control valve interior flow field which includes the valve pre-inlet channel in different conditions, then find the reasons which caused instability and pressure loss of the control valve by analyzing the flow field details, finally further optimization design. The profile matching of the valve disc and valve seat has a great influence on the interior flow field of control valve, so analysis of the high performance valve disc shape and divergence angle of valve seat is carried out, and the research conclusion is used for guide design and development of the control valve.

This study aimed at, pre-treatment of sweet potato starch wastewater and acquisition the application conditions of environmental materials though coagulation precipitation. The removal rates of COD and turbidity were investigated by process to find kind and quantity of suitable coagulant, quantity of coagulate aids, pH and setting time. The results showed that poly aluminum ferric chloride (PAFC) was chosen as an optimum coagulant for effective treatment. The optimal coagulation precipitation conditions were determined as follows: pH8, dosage of PAFC 1200mg/l, PAM100mg/l, sedimentation time 30 min. At optimum conditions of coagulation precipitation stages, the removal rate of COD and turbidity reached 25.8% and 67.5%, respectively. Therefore, coagulation process reduced the burden of subsequent wastewater treating.

This study aimed at the application conditions of environmental materials in sweet potato starch wastewater by hydrolysis acidification process. The removal rates of COD and soluble protein were investigated to find suitable natural setting time, the quantity of acidic steeping liquor and pH. The results showed that traditional fermentation not only consumes time but also scarcely removal efficiency in short time. 40% acidic steeping liquor was added as an optimum dosage for effective treatment. In addition, the effort of pH (3.0-9.0) on the hydrolysis acidification of wastewater was investigated. The removal rates of COD and soluble protein reached 26.9% and 76.3% respectively at pH4.0. Therefore, pH was adjusted to isoelectric point that can effectively reduce the burden of subsequent wastewater treatment.

The hydroxyapatite (HA) colloids were prepared with precipitator method and characterized by means of TEM and XRD .The effect of surfactant on particle nanoHA was investigated. The results show that after modified by Polyethylene glycol (PEG), the best sample was prepared by adding 3.5% PEG solution and the HA-PEG molar ratio was 3:1. the size was about 50nm long and 20nm wide.

The forest is considered as a precious and indispensable nature resource, but forest fire which can destroy forest resource safety and threaten human-living environment is considered as one of the severest disasters. How to monitor and collect information of forest fire at any time, it is a difficult problem for Forest Fire Prevention Departments to urgently solve. With the development of sensor technology, MEMS and wireless communications, wireless sensor network (WSN) has wide application in all kinds of fields. In order to prevent forest fire occurrence, this paper designs a monitoring system for forest fires based on wireless sensor network and GPRS network. The system gives the hardware design of wireless sensor nodes and software implementations, and chooses CC2530 to achieve the process of data acquisition and transmission, then sends the data through GPRS module to the remote monitoring center. By means of WSN and GPRS network, the system accomplishes data acquisition and long distance transmission.

Nano-hydroxyapatite colloid was prepared by the method of precipitation. when the colloid was dried and sintered,it always agglomerated.The CTAB and SDS were added to disperse it . The effects of surfactants on the size and phase of HA crystals were studied by TEM and XRD .The results showed that Nanometer columnar HA powders of 40nm long and 20nm wide with narrow distribution of particle size and dispersion performance can be prepared when we added CTAB aqueous solution into HA colloid,CTAB concentration is 0.3%, mol ratio between CTAB and HA is 3:10. As SDS aqueous solution was added into HA colloid, the best process is that SDS concentration is 0.6%, mol ratio between SDS and HA is 1:1. The prepared powder with wide distribution of particle size is 30-60nm long and 10-30nm wide.

The paper establishes the basic framework of the software system: firstly, the principles used by the automatic immunoenzymatic analytic system are introduced, and then design the main functional modules. This system is developed in Visual C++ 6.0 environment and takes the style of Windows XP, achieved in the whole Chinese operation interface for bulk sample detecting and data processing, making the automation of adding sample, dilution, incubation temperature, cleaning, calculate results come true, finally in the graphics, curve, data and other forms display test results and instrument working condition.