Search

In order to achieve the optimization of power consumption mode, improve user power efficiency, and realize the coordination of power supply and demand, considering the advantages of distributed energy and energy storage, a source-charge-storage multi-time-scale coordinated control strategy is proposed. According to the needs of the hybrid energy system, we analyze the complementary potential of the hybrid energy system from the output side and analyze the response priority mechanism of the integrated energy system equipment, taking the economic cost and pollutant gas emissions as the objective function, economy, environment, and system. This is a constrained source-load-storage multiobjective joint optimization and adjustment model, which is solved by a multi-time-scale cooperative control strategy. Finally, a calculation example is used to verify the feasibility of the proposed method and provide technical support for the coordinated and optimized operation of “source-load-storage.”

The firing density is an important parameter to evaluate the firing effect of rapid-fire weapons, and the multi-sky-screen target testing system is widely used in the measurement of firing density of rapid-fire weapons. However, due to the influences such as the transportation, repeated installation and movement of multi-sky-screen target, the change of ambient temperature in outfield testing, and the long-time usage, the measurement error of the firing density becomes larger. For the calibration of firing density of multi-sky-screen target, a method based on double theodolites and high-accuracy bullet holes screen was proposed. The coordinates of the bullet holes in the bullet holes screen were measured by intersection measurement of double theodolites, and then the density parameters were calculated by the density formula. The calculated density parameters were compared with that of the multi-sky-screen target to complete the calibration. By the firing practice, the uncertainty of firing density measured by double theodolites combined with bullet holes screen was evaluated. The results show that the uncertainty of the firing density measured by the proposed method is 1.6 mm, which can be used for the calibration of the multi-sky-screen target density.

The pure P2(8) line radiation of chemical hydrogen fluoride (HF) laser which can be weakly absorbed by atmosphere was generated using an absorbed module in a line-selected cavity. A numerical model of laser gain was investigated to predict and optimize the laser performance. An experimental verification was carried out in a compact continue wave (cw) tunable chemical HF laser device. It is found that P1(11) line can be suppressed by fundamental HF particles generated by combustion reaction, meanwhile the proportion of P2(8) line can be increased close to 100% from original 38%. The absorbance as well as output power of P2(8) line can also be influenced by concentration of absorbing media.

BackgroundNutrition is a crucial factor that can impact morbidity and mortality in older people living with HIV (PLWH). Studies on nutritional risk and nutritional status in all age groups in PLWH have been conducted. However, few studies have focused on nutritional risk in older PLWH. This study aimed to describe the nutritional risk and nutritional status in older PLWH, and explore factors associated with nutritional risk and undernutrition status.MethodsWe conducted a cross-sectional study. We recruited participants aged 50 years or older from the Third People’s Hospital of Shenzhen from January 2016 to May 2019. Nutritional risk and nutritional status were evaluated by the Nutritional Risk Screening 2002 (NRS 2002) tool, body mass index (BMI), albumin level, and prealbumin level on the first day of admission. Logistic regression models were used to identify the factors associated with undernutrition based on the BMI, albumin, and prealbumin criteria.ResultsA total of 196 older PLWH were included in the analysis. We found that 36% of hospitalized older PLWH had nutritional risk, and 12–56% of them had undernutrition based on the BMI, albumin, and prealbumin criteria. An increased nutritional risk score was associated with older age (β = 0.265 CI [0.021, 0.096],P = 0.002), a higher viral load (β = − 0.186 CI [− 0.620, − 0.037],P = 0.028), a lower BMI (β = − 0.287 CI [− 0.217, − 0.058],P = 0.001), and a lower albumin level (β = − 0.324 CI [− 8.896, − 1.230],P = 0.010). The CD4 count was associated with the prevalence of undernutrition based on the albumin criterion (OR = 15.637 CI [2.742, 89.178],P = 0.002).ConclusionOur study indicated that nutritional screening, assessment, and management should be routinely performed in hospitalized older PLWH. HIV-specific measures should be used to assess nutritional risk, and albumin, BMI, and other assessments should be used in combination to identify undernutrition in older PLWH.

The stratified mining of super thick coal seam is a process of repeated disturbance of the top roof, especially in the lower stratification, the upper complex rock layer has a greater settlement space, resulting in great changes in the strata structure and fissure distribution. The main coal seam thickness of Rujigou Coal Mine exceeds 20 m, due to the high gas content of the coal seam, it is prone to spontaneous combustion, and the stratified mining method is adopted. When a small-size section coal pillar (less than 10 m) is used, the complex rock structure evolution and fissure development characteristics during the stratified mining of shallow buried thick coal seam will directly affect the movement of gas transportation between the working face and the goaf and will directly affect the safety of the working face. Taking Rujigou coal mine as engineering background, this paper analyzes the breaking structure, fracture development, and evolution law of overlying strata in different layers and different sections of coal seam when the buried depth is shallow, and the extra-thick coal seam is stratified mining. The results show that in the process of stratified mining, the overlying strata break, in addition to the whole trapezoidal failure structure, will also form a local F type fracture structure, and with the stratified downward mining, the F type fracture structure will continue to move up and disappear until it is compacted. The “V” type and “U” type subsidence characteristics of different strata overburden are presented after mining in stratified working face of extra-thick coal seam, and the subsidence amount is approximately symmetrical distribution along the middle line of goaf. In the mining process of the lower part of the layer, the end broken rock block is easy to slip along the hinge point by the hinged rock beam structure, and the sliding instability occurs. In the process of stratified mining of ultrathick coal seam, the main fissure of overburden is mainly longitudinal fissure, and it is very easy to form through with the upper layer and will finally connect with the surface under the condition of shallow buried depth. The inclined cracks connected with the adjacent goaf are formed above the coal pillar of the section, which becomes the passage of gas migration in the goaf. The research conclusion shows that for the stratified mining of high gas thick coal seam, special attention should be paid to the treatment of the gas on the stratified working face. In addition to the conventional gas treatment measures such as coal seam prepumping, the buried pipe pumping in the mining area can also be adopted, which can effectively reduce the gas concentration of the working surface.

The upper part of high gas coal seam often has a hard and thick sandstone roof, which provides the condition for the occurrence of gas accident in goaf caused by the friction effect for the sliding and instability of hard quartz sandstone. Based on the engineering background of the 1007 working face of Xiakuotan Coal Mine, the conditions of sliding instability of hard quartz sandstone and the possibility of the friction effect are discussed by combining theoretical analysis with the laboratory test. When the ratio of span to thickness is less than 2∼2.56, the hard-thick sandstone strata may slip and lose stability. The influence of friction velocity and gas concentration on the induced gas of quartz sandstone is analyzed and compared. The results show that the point spark, the spark beam, and the gas explosion time are inversely proportional to the relative friction velocity, and the intensity of the gas explosion is directly proportional to the gas concentration and the relative friction velocity. This paper provides the basis for the prevention and control of gas disasters in goaf and the control of hard and thick sandstone roof strata under similar engineering geological conditions. It is of great significance to promote the safe and efficient production of coal mines and to ensure the safety of personal and property.

Due to the short working wavelength of light detection and ranging (LIDAR), the information of the distance and angular position of the target can be detected more accurately. Therefore, LIDAR has high research significance and wide application prospects in both military and civilian fields. The main components of this technology include the laser emitting module, receiving optical system, detection module and digital information processing system. The receiving optical system is the key factor for the miniaturization of LIDAR. Therefore, we optimized the design and prepared an optical system with a micro-nano structure according to the requirements of the field of view (FOV), focal length and modulation transfer function (MTF). The quality of the micro-nano optical lenses design and preparation directly affects the overall LIDAR system performance. In order to measure and analyze the optical characteristics of the micro-nano optical lenses, a multi-functional optical characteristic testing system is designed and built. The testing system is used to measure and calculate the optical characteristic parameter in the assembled micro-nano optical lenses. Compare the measured value of the optical characteristic parameter with the theoretical value, the measured result meets the design requirements of the micro-nano optical lens. Our experimental data demonstrated the testing system has practical significance for the design, preparation and image quality evaluation of micro-nano optical lenses.

This paper presents a readout integrated circuit (ROIC) for 32×32 single photon avalanche diode (SPAD) array. The ROIC integrates 32×32 active quenching circuit and time-to-digital converter (TDC) circuit. Each ROIC unit has a novel active quenching circuit (AQC) and an in-pixel TDC. The ROIC and the detectors are integrated by Flip-Chip .The novel quenching circuit with active reset function is proposed to reduce the dead time. A dual-counter-based TDC is designed to prevent the metastability of the counter. The sensor is fabricated in 180-nm CMOS BCD technology. The simulation results show the novel active quenching circuit effectively reduces the dead time down to 10 ns. The 13bit-TDC helps the system achieve centimeter-accuracy detection.

Space-chip coupling using silicon photonic grating coupler is of great significance for OPA-based LIDAR (Optical Phased Array, OPA), free-space data communication, and so on. However, Silicon-based grating couplers are commonly used for fiber-chip coupling and space-chip coupling is rarely mentioned. In order to obtain the optimal coupling effect, commercial three-dimensional Finite Difference Time-Domain (3D FDTD) software is employed to simulate the coupling process and analyze the characteristics of spatial light coupling. Because the spot size is in the order of micrometer, we first build a vector beam with three variables of numerical aperture, lens diameter and beam diameter for simulation. Afterwards, the incident location of the spatial light beam, the incident angle and the grating width are scanned to explore the influence of these parameters on coupling efficiency. We have found that the total coupling efficiency changes with grating width exponentially. That is, the total coupling efficiency firstly increases with the grating width, and does not change after reaching the maximum value. However, the coupling efficiency of the fundamental mode decreases gradually after reaching the maximum value. This indicates that higher-order modes are more likely to be excited when the width is greater than the optimized grating width. Besides, the coupling efficiency varies parabolically with the incident angle and location of the spatial light beam. There exists optimal incident angle and location on the parabola symmetry axis to get the maximum coupling efficiency. Furthermore, the best incident position is half of the beam diameter from the beginning of grating coupler.

With the increase in the use of renewable energy, especially the development and utilization of solar energy resources, accurate photovoltaic power generation prediction technology will help the promotion of photovoltaic power generation. The amount of photovoltaic power generation depends on weather conditions, and it is easy to produce large fluctuations under different weather conditions. Its power generation has the characteristics of randomness, fluctuation and intermittency. In view of the shortcomings of the traditional BP neural network prediction method, this paper proposes an improved artificial bee colony algorithm. The improved artificial bee colony algorithm is used to optimize the network parameter weights in the traditional BP algorithm, and the two algorithms are merged in global iteration. Based on the characteristics of training light intensity, weather, temperature and historical power value of photovoltaic output power,a photovoltaic power generation prediction model is established. The simulation results show that the improved artificial bee colony algorithm in the neural network’s photovoltaic power generation forecast improves the accuracy and convergence speed of the traditional BP neural network convergence solution, and can provide more comprehensive information for grid power dispatch and control.

The hierarchical model design of "area-plant-equipment" is adopted to make a panoramic model for the renewable energy data, and the dynamic synchronization and operation data collection mechanism of the renewable energy basic data is constructed in this paper. Based on the quasi-real-time system open software platform and WebGIS development platform of the third district of the smart grid dispatching and control system platform, a comprehensive analysis and management technology of renewable energy data supported system is developed. This system is able to realize comprehensive analysis management and visual display of important data such as basic data management, operational data analysis, and daily work reports for renewable energy generation. It is proved that this technology can provide technical means for further deepening dispatch management of renewable energy and promoting renewable energy accommodation, and improve the work efficiency and level of daily renewable energy power generation operation management.

We design and demonstrate a one-dimensional grating coupler with a low polarization-dependent loss (PDL) for large spatial light spots. Based on current fabrication conditions, we first utilize genetic algorithms to find the optimal grating structure including the distributions of duty and periods, making the effective refractive index of transverse electric mode the same as that of transverse magnetic mode. The designed grating coupler is fabricated on the common silicon-on-insulator platform and the PDL is measured to be within 0.41 dB covering the C-band.

Hierarchical micro/nanostructure surface structures with different spatial characteristics are achieved after irradiation of crystalline silicon via femtosecond (fs) laser pulses (800 nm, 120 fs, 1 kHz) with the sample submerged in ethanol. According to laser pulse energy and fabrication parameters (such as scanning speed and superimposed writing), a characteristic morphology evolution of ovoid-like smooth modified area, ripple-like, wave-like, and coral-like micro/nanostructures is demonstrated, and the underline principle is discussed. The amorphization of fs laser-modified area is verified and investigated by Raman spectroscope. These modified structures have potential applications in sensors, silicon photovoltaic cells, and sterilization.

Problems of electromagnetic environment are getting more and more attention nowadays for design and operation in power system. Corona discharge of jumper spacers for 750 kV transmission line in some northwest part areas of China is relatively severe and need to be optimized. In this paper finite element method is used to simulate the distributions of electric field on the surface of jumper spacer under the actual transmission line and influences of electric distribution are also discussed. According to the simulation results, corona discharge test is performed. By using the anti-corona ball on the clamp of jumper spacer can reduce the electric field strength from 35.4 kV/cm to 29.2 kV/cm (ball diameter 100 mm) and 22.5 kV/cm (ball diameter 150 mm). The inception voltage and extinction voltage are raised more than 23.5% and 19.4% respectively. The method discussed in this paper can be taken as the reference in optimization and design for the jumper spacer of 750 kV transmission line.

In many developing countries, the public understanding of physical condition is increasing, and there are already a large number of users who regularly perform physical examinations to observe health conditions. At the same time, in medical treatment, Chinese medicine is often questioned because of its subjective nature. This requires an objective, intuitive and scientific means to guide and corroborate Chinese medicine. According to the features of the user model and the principles of design aesthetics, the comprehensive principles of the appearance of medical product design are analyzed and summarized in this paper.

Corona performance is an key issue in the design and operation of high voltage transmission lines. Corona discharge phenomenon is relatively obvious for grading ring of 500 kV compact transmission suspension string in some northwest part of China, and need to be optimized as to meet the operation requirement of high altitude areas. In this paper, finite element analysis software is used to model actual compact transmission line and calculate surface electric field distribution of grading ring both before and after optimization. Corona discharge characteristic of grading ring is also performed according to the simulation result and discharge photon number of ultraviolet rays is recorded by ultraviolet image apparatus. It indicated that the maximum electric field intensity is decreased by nearly 35.9 % to 24. S kV/cm from 38.7 kV/cm by optimization of type, pipe diameter and installation method. The relationship between photon number of ultraviolet rays and applied voltage is approximate the power function, and the inception and extinction corona voltage after optimization is respectively 34.3 %, 43.3 % higher than before. The electric field distribution of grading ring is effectively improved by the optimization studied in this paper and grading ring can operate normally at high altitude about 3500 m, as to meet the altitude correction requirement of IEC 60071–2.

Objective: To investigate the different serum expressions of CD3+, CD4+ and CD8+ in the peripheral blood among the patients with Recurrent Spontaneous Abortion (RAS) before and after immunization therapy and to evaluate the clinical effects and pregnancy outcomes. Methods: 157 RAS patients with negative blocking antibody in our hospital were enrolled into the study and treated with immunity therapy from September 2015 to August 2017. The blocking efficiency of T lymphocytes (CD3+, CD4+ and CD8+) in peripheral blood of patients with the lymphocyte of patients’ husband (or unrelated healthy male) as antigen target were measured by double fluorescent marker flow cytometric analysis technique. Results: After treatment, the serum blocking efficiency of CD3+, CD4+, CD8+ were higher than before treatment, P

A novel radar high resolution range profile (HRRP) recognition method based on discriminant deep autoencoders is proposed to enhance the classification performance with limited training samples. Compared with the conventional models, the proposed method not only extracts high-level feature which can reflect physical structure of HRRP, but also trains HRRP samples globally to reduce the requirement of the training data. The experiment based on the measured data demonstrates the physical meanings of the extracted feature. Moreover, the recognition performance of the proposed method consistently outperforms the conventional models, and the improvement become more significant with smaller training data size.

The continuous administration of compound danshen dripping pills (CDDP) showed good efficacy in relieving myocardial ischemia clinically. To probe the underlying mechanism, metabolic features were evaluated in a rat model of acute myocardial ischemia induced by isoproterenol (ISO) and administrated with CDDP using a metabolomics platform. Our data revealed that the ISO-induced animal model showed obvious myocardial injury, decreased energy production, and a marked change in metabolomic patterns in plasma and heart tissue. CDDP pretreatment increased energy production, ameliorated biochemical indices, modulated the changes and metabolomic pattern induced by ISO, especially in heart tissue. For the first time, we found that ISO induced myocardial ischemia was accomplished with a reduced fatty acids metabolism and an elevated glycolysis for energy supply upon the ischemic stress; while CDDP pretreatment prevented the tendency induced by ISO and enhanced a metabolic shift towards fatty acids metabolism that conventionally dominates energy supply to cardiac muscle cells. These data suggested that the underlying mechanism of CDDP involved regulating the dominant energy production mode and enhancing a metabolic shift toward fatty acids metabolism in ischemic heart. It was further indicated that CDDP had the potential to prevent myocardial ischemia in clinic.

By integrating gas, electricity, and cooling and heat networks, multi-energy system (MES) breaks the bondage of isolated planning and operation of independent energy systems. Appropriate scheduling of MES is critical to the operational economy, and it is essential to design scheduling strategies to achieve maximum economic benefits. In addition to the emergence of energy conversion systems, the other main novelty of MES is the multivariate of load, which offers a great optimization potential by changing load replaceability (flexibly adjusting the composition of loads). In this paper, by designing load replaceability index (LRI) of composite load in MES, its interaction mechanism with scheduling optimum is systematically analyzed. Through case studies, it is proven that the optimum can be improved by elevating load replaceability.

IMPORTANCE: Dapsone hypersensitivity syndrome (DHS) is the most serious adverse reaction associated with dapsone administration and one of the major causes of death in patients with leprosy, whose standard treatment includes multidrug therapy (MDT) with dapsone, rifampicin, and clofazimine. Although the HLA-B*13:01 polymorphism has been identified as the genetic determinant of DHS in the Chinese population, no studies to date have been done to evaluate whether prospective HLA-B*13:01 screening could prevent DHS by identifying patients who should not receive dapsone. OBJECTIVE: To evaluate the clinical use of prospective HLA-B*13:01 screening for reduction of the incidence of DHS by excluding dapsone from the treatment for patients with HLA-B*13:01–positive leprosy. DESIGN, SETTING, AND PARTICIPANTS: A prospective cohort study was conducted from February 15, 2015, to April 30, 2018, in 21 provinces throughout China. A total of 1539 patients with newly diagnosed leprosy were enrolled who had not received dapsone previously. After excluding patients who had a history of allergy to sulfones or glucose-6-phosphate dehydrogenase deficiency, 1512 individuals underwent HLA-B*13:01 genotyping. All of the patients were followed up weekly for the first 8 weeks after treatment to monitor for adverse events. EXPOSURES: Patients who were HLA-B*13:01 carriers were instructed to eliminate dapsone from their treatment regimens, and noncarrier patients received standard MDT. MAIN OUTCOMES AND MEASURES: The primary outcome was the incidence of DHS. The historical incidence rate of DHS (1.0%) was used as a control. RESULTS: Among 1512 patients (1026 [67.9%] men, 486 [32.1%] women; mean [SD] age, 43.1 [16.2] years), 261 (17.3%) were identified as carriers of the HLA-B*13:01 allele. A total of 714 adverse events in 384 patients were observed during the follow-up period. Dapsone hypersensitivity syndrome did not develop in any of the 1251 patients who were HLA-B*13:01–negative who received dapsone, while approximately 13 patients would be expected to experience DHS, based on the historical incidence rate of 1.0% per year (P = 2.05 × 10(−5)). No significant correlation was found between other adverse events, including dermatologic or other events, and HLA-B*13:01 status. CONCLUSIONS AND RELEVANCE: Prospective HLA-B*13:01 screening and subsequent elimination of dapsone from MDT for patients with HLA-B*13:01–positive leprosy may significantly reduce the incidence of DHS in the Chinese population.

The high-order staggering grid Finite-Difference (FD) scheme based on first-order velocity-stress elastic wave equation has been deduced. The calculation method of PML boundary condition and stability condition established in this study can be used for numerical simulation of advanced detection of elastic wave in roadway, with the obtaining of high-precision seismogram. Then we systematically analyze the polarity of vector wave field in post-source observation system. The results indicate that the relationship between the vector wave field and the polarity of direct wave is related to reflection coefficient on the interface, while the polarity relationship between horizontal and vertical components of vector wave field is related to vertical position of the interface. During data processing for advanced detection of elastic waves, the sign of the reflection coefficient on the interface ahead can be determined based on the polarity relationship between reflected wave and direct wave from the seismograms; the soft and hard rock and other geological information on both sides of the interface is thus be determined. In addition, the direction of source wave depends on polarity relationship between horizontal and vertical components of reflected wave and is used to achieve the separation of up going and down going waves.

We design a single photon avalanche diode (SPAD) in a standard 180-nm CMOS technology. The SPAD consists of a P+/n-well junction with octagon shape, a p-well guard-ring and a ploy guard-ring. The two rings prevent SPAD from premature edge breakdown events and STI interface trap influence, respectively. The measurement results show that a typical dark count rate of SPAD is 8 kHz at room temperature and its PDP is 8% at wavelength of 640nm. The distance measurement is carried out by a SPAD direct Time of Flight method. A centimeter-level precision is achieved based on time-correlated single-photon counting technology.

Characteristic of switching impulse discharge plays an important role during the external insulation design of transmission and transformation project. For the determination of calculation method of switching impulse discharge strength, this paper introduces a new elasticity coefficient mathematical model based on the test research of rod-plane air gaps under 50% standard switching impulse voltage. The model is proved to be effective by t verification method. By using the concept of the gap factor, the switching impulse voltages of phase to earth and phase to phase air gaps for typical electrode were calculated, such as two bundle conductor and grading ring. It provides that, in the research distance range 2.5 m to 4.0 m, the deviations between the calculated and test results are small and the average absolute value are not higher than 4%. Calculation model given in this paper can be regarded as theoretical basis for switching impulse voltage discharge strength research, particularly helpful for design and optimization in transmission and transformation projects.

Research about multimedia streaming in cognitive radio network has become a hot issue recently. In order to enhance the throughput of real-time multimedia streaming and maximize the utility, we proposes a dynamic spectrum allocation strategy based on Qos-layering and auction theory (QLAS). In this strategy, we classify the secondary users according to the feature of data stream, and choose the optimal channel for every user. When the primary base station receives the access request, it chooses the winner based on auction theory and allocate spectrum to winners. Analysis and simulation result show that, this strategy can guarantee the heterogeneous requirements of heterogeneous SUs and improve the spectrum utilization.

In order to obtain the means to control light polarization, we designed a structure of coupled magnetic resonators and studied its transmission properties by the 4x4 transfer matrix method. The incidence of linearly polarized light results in two transmission resonant peaks of left-handed circular polarization at shorter wavelengths and two transmission resonant peaks of right-handed circular polarization at longer wavelengths, respectively. Through adjusting the magnetizations, the inner left-handed circular polarization and right-handed circular polarization can be merged into one linear polarization, while the two outside resonant peaks keep their circular polarization. The polarized direction of the output linearly polarized light can be controlled by the polarized direction of incidence light. The incidence light with one polarization can output light with three kinds of polarizations through the designed structure.

In order to design an optical system with focal length range from 17 to 1 700 mm,a proper initial optical layout is selected first,the rule of system performance influenced by Guassian solution is found through comparing Guassian optical calculation results,and the key parameters of the system are selected.Then the configuration of each assembly is chosen through analyzing the relative aperture and characteristics of aberrations,and the system aberration is corrected and balanced.The total track of the result lens is 760 mm,the modulation transfer functions at 50 lp/mm for each zoom configurations and all fields of view are greater than 0.3,and all indexes satisfy the command of system.

Recently, multidimensional scaling (MDS) algorithms have been verified to be robust for the emitter localization. However, the traditional MDS algorithms are based on single one kind of measurement. In this paper, a novel hybrid MDS localization algorithm based on both angle-of-arrival (AOA) and time-of-arrival (TOA) measurements is proposed. In the condition that one of the sensors can obtain the AOA of the emitter, this algorithm utilizes AOA measurement to improve the traditional MDS localization based on TOA measurements. The simulation results demonstrated the improvement of this algorithm.

In the natural disasters, reserve capacity of the government affects directly the efficiency of disaster relief, especially in the crucial period. Base on current situation and problems of emergency resources reserve in China, a combination of suppliers and state central warehouse reserve method is proposed to improve emergency reserve capability. This article proposed a multi-objective approach for choosing reserve mode and quantity. The objectives are (i) minimizing total operating cost and (ii) minimizing total weighted distance. The model is solved using-constraint methods. The results derived from CPLEX based on a case study are also presented. The results indicate that the model serves as an efficient tool for handling emergency resource reserve problem.

An effective single line continuous wave HF chemical laser operation has been demonstrated using a Littrow-mounted diffractive grating cavity experimentally. Selection of spectral lines of the laser was investigated when the grating used as a reflector and an output mirror respectively. The feedback factor of the cavity is demonstrated important parameter of line selection. Output power of single line from grating cavity is obviously stronger than the same line within the full spectrum of the laser that operated without line selection.

We investigate the refraction phenomena of extraordinary light at a planar interface associated with a uniaxial left-handed medium. It is found that the anomalous positive refraction can occur at the interface from an isotropic right-handed medium to a uniaxially anisotropic left-handed medium. When the optical axis of a uniaxial left-handed medium is not normal or parallel to the interface, the refraction of the Poynting vector for the extraordinary waves can be either positive or negative depending on the incident angles, while the refraction of the wave vector is always negative. The physical essential of the anomalous positive refraction results from the anisotropy of uniaxial crystals.

The klystron output circuit of double coupled cylindrical coaxial cavity loaded with waveguide filters is designed and analyzed with two-port microwave network model theory. The output waveguide port is regarded as the first port, the drift tube gaps in cavity as the second one. By sweep frequency simulation with CST software, the change of scattering parameters square S 21 2 with the frequency shows that the output circuit 3dB bandwidth is about 0.36GHz, relative bandwidth ΔF/F 0 ≈ 3.7%.

The main structure and key techniques of our Virtual Exhibition Software are summarized. It demonstrates the practice of Software Engineering during the development of our project and discusses the use of UML in it.

Using UV imaging technology, according to the special absorption 、reflection 、scattering and fluorescence characterization of the various residues in fingerprints (fatty acid ester, protein, and carboxylic acid salts etc) to the UV light, weaken or eliminate the background disturbance to increase the brightness contrast of fingerprints with the background, and design、setup the illumination optical system and UV imaging system, the noninvasive detection of latent fingerprints remaining on various object surface are studied. In the illumination optical system, using the 266nm UV Nd:YAG solid state laser as illumination light source, by calculating the best coupling conditions of the laser beam with UV liquid core fiber and analyzing the beam transforming characterizations, we designed and setup the optical system to realize the UV imaging uniform illumination. In the UV imaging system, the UV lens is selected as the fingerprint imaging element, and the UV intensified CCD (ICCD) which consists of a second-generation UV image intensifier and a CCD coupled by fiber plate and taper directly are used as the imaging sensing element. The best imaging conditions of the UV lens with ICCD were analyzed and the imaging system was designed and setup. In this study, by analyzing the factors which influence the detection effect, optimal design and setup the illumination system and imaging system, latent fingerprints on the surface of the paint tin box、plastic、smooth paper、notebook paper and print paper were noninvasive detected and appeared, and the result meet the fingerprint identification requirements in forensic science.

Motion analysis is based on the extraction of the human target. The purpose of motion target detection is extract the human target for the background from a video sequence, requiring extract the complete human outline and reflect the morphological characteristics of the human target. Effective extraction of motion targets is very important for the next steps of action recognition. Here are several motion object detection methods: background subtraction method, temporal difference method, optical flow method.

Propose a reduced sample algorithm for SVM based on Euclidean distance according to analysis the distribution feature of the support vectors. Firstly, this method pre-defines the Quasi-classification hypeplane. Then select the boundary samples according to the Euclidean distance from one sample point to the Quasi-classification hypeplane and get new training dataset. Because the new training dataset is the subset of the original training dataset, so this method can greatly reduce the size of the training dataset and improve the training speed. Finally, simulate with linear separation data and non-linear separation data. And the experimental results show the method is effective.

The distribution of interests is a key part of the process of IUR cooperative technology innovation, and there are some potential conflicts between the main subjects of cooperative innovation. This paper firstly analyzes the main interest conflicts among the subjects of IUR cooperative technology innovation; secondly it constructs a dynamic game model of industry, UR and government; then it makes a general equilibrium analysis; at last it gives some enlightenment of the distribution of benefits.

Nowadays, with the introduction of competitive electricity markets, large scale interconnected power grids are operated closer to their operation limits, and power system operators often have a dual and conflicting responsibility for system security and for profit maximization. Insuring power grid operating safely and stably under complicated operating conditions has become a rigorous challenge to electric utilities. This paper discusses some online security check technologies, and presents a power system security check software package implemented with advanced visualization technologies. The application of power system security check is based on CIM model so as to facilitate the passing of power system data with other applications.

Latent fingerprints present a considerable challenge in forensics, and noninvasive procedure that captures a digital image of the latent fingerprints is significant in the field of criminal investigation. The capability of photography technologies using 266nm UV Nd:YAG solid state laser as excitation light source to provide detailed images of unprocessed latent fingerprints is demonstrated. Unprocessed latent fingerprints were developed on various non-absorbent and absorbing substrates. According to the special absorption, reflection, scattering and fluorescence characterization of the various residues in fingerprints (fatty acid ester, protein, and carbosylic acid salts etc) to the UV light to weaken or eliminate the background disturbance and increase the brightness contrast of fingerprints with the background, and using 266nm UV laser as excitation light source, fresh and old latent fingerprints on the surface of four types of non-absorbent objects as magazine cover, glass, back of cellphone, wood desktop paintwork and two types of absorbing objects as manila envelope, notebook paper were noninvasive detected and appeared through reflection photography and fluorescence photography technologies, and the results meet the fingerprint identification requirements in forensic science.

This paper describes a newly designed monitoring and data acquisition system based on an embedded web server, the system adopts browser/server (B/S) framework. The goal of this project is to implement a system with fully configurable characteristic both in hardware and software. The advantages and application domains of the monitoring framework based-on web server are argued, and the hardware structure and the software architecture are discussed in details.

In experimental research, we first measure the exact thickness of the solidified carbon fiber-reinforced plastic (CFRP) with the three-coordinate measuring machine, then use Shimadzu testing machine to measure elastic modulus and shear modulus of the adhesive; We do static test on H-shaped steel girder reinforced by CFRP which has different thickness, and paste strain foil on the surface of CFRP to record the change of strain and place the displacement meter in the middle of the span to observe the deformation. Making use of the performance parameters of composite materials, we use finite element method for H-shaped steel girder reinforced by CFRP to make simulation analysis, put forward truss element simulation of bonding layer, “Shell element-Truss-Entity”of CFRP reinforced H-shaped steel girder simulation of composite component model to simulate experiments, and obtain load-deflection curve, ultimate strength and deformation of reinforced composite component. The test results agree well with numerical simulation results and the comparison of the results shows that the proposed modeling approach and the experimental program is feasible, so they will provide reference for CFRP reinforcement in steel structure in the future.