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Dongjiahe Coal Mine belongs to the Carboniferous Permian coal field which has a high degree of karst and fissure development. This paper takes the working face of Dongjiahe Coal Mine as an example; through the microseismic(MS) monitoring system arranged on the working face, the moment tensor theory was used to invert the focal mechanism solution of the anomalous area of the floor MS event; combining the numerical simulation and field data, the underlying floor faults were identified by the stress inversion method. The results show that: 1) Moment tensors were decomposed into three components and the main type of rupture in this area is mixed failure according to the relative criterion; 2) The hidden fault belongs to the reversed fault, its dip angle is approximately 70°, and the rupture length is 21 m determined by the inversion method of the initial dynamic polarity and stress in the focal mechanism; 3) The failure process of the fault is divided into three stages by numerical simulation method combined with the temporal and spatial distribution of MS events. The results can provide a reference for early warning and evaluation of similar coal mine water inrush risks.

Based on the study of the movement rule of the rock strata under the influence of the mining speed in the typical working face of Dongjiahe coal mine, the distribution of microseismic events and the variation characteristics of microseismic parameters in the slow and fast advancing stage are compared and analyzed, and the mechanism of the rock strata activity under the influence of the mining advancing speed is revealed from the perspective of the microfracture. The results show that the movement of the roof strata and the stress adjustment of surrounding rock have certain timeliness. The maximum advanced distance of microseismic events in the slow and fast stages is 185 m and 130 m, respectively, and the maximum lag distance of microseismic events in the goaf is 120 m and 180 m, respectively. The time of stress adjustment of surrounding rock is short, and the load transfer of the roof is insufficient. The advanced distance of microseismic events is increased, and the lag distance decreases. The percentage of microseismic events in the total number of events is 47% and 38%, respectively, in the slow and fast stages of advancing. With the increase of mining speed, the intensity of roof strata activity in the goaf is weakened. The rock failure decreases and the volume of broken block increases, and roof collapse and rotary subsidence are insufficient. During the nonpressure period, the maximum development elevation of microseismic events is +350 m and +300 m, respectively, in the slow and fast stages, while with the development elevation of microseismic events in the roof pressure near +390 m, increasing the mining speed cannot change the final failure height of the overburden. During the analysis period of roof pressure, the concentrated release of microseismic energy in the faster stage is 183% of that in the slower stage. The increase of large moment magnitude event frequency leads to the decrease of b value. The risk of roof instability and strata behavior increases.

The intricate distribution of fractures in rock mass leads to the anisotropy of permeability characteristics of the rock mass, which affects the overall stability of rock mass. Aiming at the water inrush from floor in the deep mining of the Dongjiahe coal mine, the distribution and development law of fractures in coal mine rock mass are determined by combining the acoustic emission information from the RFPA software and the in-site microseismic monitoring data. The representative element volume (REV) of permeability of fractured rock mass is determined by numerical simulation. The results show that: (1) As the increase of surrounding rock pressure, the permeability coefficient is decreasing, as well as the principal values of permeability. (2) Under the same surrounding rock pressure, the surrounding rock pressure has little influence on the principal directions of permeability; when the surrounding rock pressure is different, the principal directions of permeability changes greatly with the change of surrounding rock pressure. (3) With the increase of the trace length, the principal values of permeability dramatically increase and the size of REV gradually decreases. When the trace length reaches a certain size, the influence on the REV can be ignored.

Background Randomised control trials and genetic analyses have demonstrated that vitamin D or 25-hydroxyvitamin D (25[OH]D) levels may not play a causal role in the development of cardiovascular disease. However, it is unclear if 25(OH)D is causally associated with cause-specific vascular disease and lipids. Therefore, we examined the causal association of 25(OH)D with myocardial infarction, stroke, ischaemic heart disease, ischaemic stroke, subarachnoid haemorrhage, intracerebral haemorrhage, and lipid levels among both Chinese and Europeans. Methods We used a Mendelian randomisation (MR) design in the China Kadoorie Biobank, the Copenhagen City Heart Study, and the Copenhagen General Population Study. The 25(OH)D-related genetic variants in the CYP2R1 and DCHR7 genes were genotyped in 99,012 Chinese adults and 106,911 Danish adults. Results In Chinese adults, plasma 25(OH)D levels were not significantly associated with cause-specific vascular disease or mortality, with the exception of intracerebral haemorrhage (HR, 1.09 [95% CI, 1.01,1.18] per 25 nmol/L higher plasma 25(OH)D). In Europeans, plasma 25(OH)D levels were inversely associated with all types of vascular diseases and mortality. However, MR analysis did not demonstrate causal associations of genetically increased 25(OH)D levels with cause-specific vascular diseases, or mortality in both Chinese and European adults. In addition, each 25 nmol/L higher 25(OH)D was observationally associated with lower total cholesterol and low-density lipoprotein cholesterol levels, but higher high-density lipoprotein cholesterol levels. Likewise, MR analysis showed that 25(OH)D levels were not causally associated with lipids in both Chinese and European adults after Bonferroni correction. Conclusions We found no evidence to support that genetically increased 25(OH)D was associated with a lower risk of ischaemic stroke, intracerebral haemorrhage, subarachnoid haemorrhage, and lipid levels in both Chinese and European adults. These results suggest that the inverse associations of vitamin D with vascular disease could be the result of confounding. Electronic supplementary material The online version of this article (10.1186/s12916-019-1401-y) contains supplementary material, which is available to authorized users.

Objective We aimed to examine the associations between ambient air pollutants and daily mortality in Northeast China from 2014 to 2018. Methods A two-stage approach was used to estimate particulate matter with an aerodynamic diameter of 10 μm (PM10), nitrogen dioxide (NO2), and sulfur dioxide (SO2) exposure and daily mortality. Results An increase of 10 μg/m of PM10 exposure and NO2 at lag of 0 to16 days was associated with the cumulative relative risk (RR) of 1.011 (95% confidence interval [CI]: 1.004, 1.019) and 1.026 (95% CI: 1.004, 1.049), respectively, in non-accident mortality. Meanwhile, significant association was observed in people aged under 60 years between SO2 exposure and respiratory mortality at lag of 0 to 9 days. Conclusions Our findings strengthen the evidence of PM10 and NO2 exposures were independent risk for daily mortality.

Blue lasers are very useful for applications in fundamental sciences and advanced technologies. Although the frequency doubling with a first-order quasi-phase-matched (QPM) crystal is an effective approach to obtain blue and UV lasers, the crystal should be poled with a short period, which is technically difficult to fabricate compared with a long period. Using a third-order QPM can be an alternative way to generate blue light, in which the poling period is 3 times larger than that in first-order QPM. In this work, we report on the generation of a 402.5 nm laser by using cavity-enhanced second-harmonic generation and a periodically poled KTP (PPKTP) crystal with a poling period of 10.02 µm. About 36.49 mW output power and 15.3% conversion efficiency are achieved in our experiment.

The wx-AMPS simulation software is used to model and simulate the Schottky perovskite thin film solar cells. The front and back electrodes with different work functions are applied to the Schottky perovskite solar cells to study the effect of band structure on the performance of solar cells. The results show that in a range from 3.8 to 4.4 eV, as the work function of the front electrode decreases, the conversion efficiency of the Schottky solar cells gradually increases. When the work function of the front electrode is low, the electric field strength is large, which facilitates the transport of carriers in the light-absorbing layer of the perovskite and reduces the carrier recombination rate of the perovskite layer. In addition, the recombination ratio of the light absorbing layer is reduced due to the increase of the electric field strength, and the parallel resistance is increased to a certain extent thereby increasing the FF and improving the output efficiency of the battery. At the same time, when the current electrode work function is maintained at 3.8 eV, in a range from 4.3 to 5.5 eV, the higher the work function of the back electrode, the greater the conversion efficiency of the Schottky solar cell is. This conduces to the band alignment in contact between perovskite and back electrode. Under the premise that the common electrode Au is used as a back electrode, the work function of the front electrode is 3.8 eV and the conversion efficiency of the Schottky perovskite solar cell is 17.93%. In addition, by using the optimized front and rear contact electrodes, the quality of the perovskite layer material, thus the performance of the solar cell can be further improved. Doping till a certain concentration and removing the defects of the perovskite layer, the conversion efficiency of the solar cell with a thickness of 500 nm can be increased from 17.93% to 20.1%. The simulation results show that the Schottky perovskite thin film solar cells can obtain excellent performance with simple device structure and have great potential applications.

In order to meet the needs for the integration and miniaturization of CCD imaging circuit, a software integrated design method is provided in this paper. Using FPGA as the core of the imaging circuit, the three parts of the traditional CCD imaging circuit, which is focal plane software, signal processing software and integration timing software, are integrated into a piece of FPGA, mainly generating the timing drive signal needed for CCD imaging, configuring the A/D converter to realize analog to digital conversion, coding and synthesizing the converted image data and arranging the data transmission format, realizing the communication between the imaging circuit and the outside by the telemetry and telecontrol three wire interface, so as to receive the auxiliary data on the satellite and the adjustment instructions of the imaging parameters. The experimental results show that the integrated software design of this paper can realize all functions of focal plane software, signal processing software and integration timing software. The imaging effect is clear, the hardware circuit is simplified and the software integration is improved, and it has high engineering application value.

A set of FPGA software system for video signal processing circuit is designed in this paper. The system uses FPGA as the core logic control and uses high speed serial transceiver chip tlk2711 as the interface of data transmission. This paper describes the main components of the software and the realization method of the modular design of FPGA, and gives the simulation waveforms and debug results of the main modules. The test results show that the data transmission interfaces provided by the system have a data rate of 6.4Gbps, which can meet the testing requirements of the satellite camera video processing functions and greatly improve the data transmission rate and accuracy.

Aim We aim to study association serum creatinine(cr) variability and albuminuria progression. Methods We conducted a retrospective cohort study on patients with Type 2 Diabetes Mellitus at a Diabetes Centre in Singapore (“discovery cohort”). Outcome is worsening of urinary albumin-to-creatinine(ACR) across stages. Cr variability was expressed as adjusted cr-intrapersonal standard deviation(SD) and coefficient-of-variation(cr-CV). A separate cohort was used for validating association between cr variability and albuminuria progression (“validation cohort”). Results Over median follow-up of 4.2 years, 38.4% of 636 patients had albuminuria progression in the discovery cohort. Increasing log-transformed adjusted cr-intrapersonal SD and cr-CV were significantly associated with albuminuria progression: HRs 1.43 (95%CI 1.11–1.85) and 1.44 (1.11–1.87) respectively in the discovery cohort, and HRs 1.94 (1.09–3.45) and 1.91 (1.05–3.45) respectively in the validation cohort. When stratified by baseline urinary ACR, higher cr variability was significantly associated with albuminuria progression in patients with normoalbuminuria but not microalbuminuria. Conclusions Cr variability independently predicts albuminuria onset. This is evident in patients with normoalbuminuria, suggesting that higher cr variability could herald albuminuria onset.

Based on a large amount of document materials, the concepts and measures that realizing marketization of forest environmental resource have been studied in this paper. Detailed content included evaluation value and clearly established ownership of forest environmental resource, the main issues that affected forestry marketization, such as principal-agent analysis, capital investment, the laws and government regulations and carbon sequestration market. Finally summarized the valuation and prospect of problems mentioned above. The purpose is going to provide basic messages and rational orientations for forest environmental resource development and research.

Navigation ground verification is an essential part of X-ray pulsar navigation (XPNAV) research. Aiming at the need of real and continuous pulsar signals for navigation algorithm verification, and to avoid the difficulties and high costs of X-ray modulation and detection, we propose an XPNAV ground verification system based on visible light source. In this system, the pulsar signal model at the solar system barycenter and the orbit information are used to establish the real-time photon arrival rate function at a spacecraft, and then the rate function is digitized and converted into voltage signal by the designed hardware system to drive a linear light source. After the processes of light attenuation, signal detection and pulse discrimination are experienced, the real-time photon time of arrivals (TOAs) at a spacecraft can be achieved. These photon TOAs contain characteristics of the pulsar profiles and frequency, the time propagation effect in the solar system, and cosmic X-ray background. The system uses semi-physical devices to modulate and attenuate visible light, and judges whether the spacecraft can observe the navigation pulsar according to the real position, thereby realizing the simulation of X-ray propagation in space. At present, the detection method of pulsar observation with single detector include detection of single pulsar, time division detection of multiple pulsars, and simultaneous detection of multiple pulsars. The system has four channels, each of which has three output modes mentioned above, and can support the verification of multiple navigation modes. This system consists of signal simulator and controller, single photon generator and detector, single photon screening and time tagging, and navigation algorithm verification. This paper presents the testing results of the system characteristics, the authenticity of the simulated photon arrival time series and the navigation verification. Monte Carlo experiments show that the recording accuracy of photon arrival time is 10 ns and the delays of the four channels are (11 ± 2), (15 ± 4), (14 ± 3), and (16 ± 4) \begin{document}${\text{μ}}{\rm{s}}$\end{document}, respectively. The multi-physical properties of simulated photon arrival time series are introduced in detail, including photon flux, shape of observation profile, pulsar frequency characteristics and Doppler shift. The position and velocity errors of autonomous navigation algorithm test are 13.587 km and 14.277 m·s–1, respectively, with an orbital altitude 26610 km and within 10 h. The ground verification system adopts master-slave control mode, the master computer mainly implements parameter setting and navigation algorithm verification, and the slave computer mainly carry out pulsar signal simulation. The communication based on TCP/IP protocol is applied to realize parameter transmission and real-time control between the master and slave computers in navigation verification process. The results of performance and functional test show that the system is available to accomplish the simulation of photon TOAs of X-ray pulsars at a spacecraft in real time and implement the ground verification of XPNAV.

Aim To determine whether diameters of the left gastric vein (LGV) and its originating vein are associated with endoscopic grades of esophageal varices. Methods Ninety-eight liver cirrhotic patients with hepatitis B undergoing magnetic resonance (MR) portography, and upper gastrointestinal endoscopy for grading esophageal varices were enrolled. Diameters of the LGV and its originating vein – the splenic vein (SV) or portal vein (PV) – were measured on MR imaging. Statistical analyses were performed to identify the association of the diameters with the endoscopic grades. Results Univariate analysis showed that the SV was predominantly the originating vein of the LGV, and diameters of the LGV and SV were associated with grades of esophageal varices. Diameters of the LGV (P = 0.023, odds ratio [OR] = 1.583) and SV (P = 0.012, OR = 2.126) were independent risk factors of presence of the varices. Cut-off LGV diameters of 5.1 mm, 5.9 mm, 6.6 mm, 7.1 mm, 7.8 mm and 5.8 mm; or cut-off SV diameters of 7.3 mm, 7.9 mm, 8.4 mm, 9.5 mm, 10.7 mm and 8.3 mm, could discriminate grades 0 from 1, 0 from 2, 0 from 3, 1 from 3, 2 from 3, and 0–1 from 2–3, respectively. Conclusion Diameters of the LGV and SV are associated with endoscopic grades of esophageal varices.

To avoid traffic congestion, improve transport efficiency, and meet the requirements of users and traffic flow equilibri­ urn, the fusion framework of urban traffic control and route guidance was studied. The characteristics of an urban traffic control and route guidance system and a cyber-physical system (CPS) were analyzed, and the relationship between such systems was examined. The technical requirements of the application of CPS theory to an urban traffic control and route guidance system were discussed. Based on the components of a dynamic urban traffic flow guidance system (UTFGS) and urban traffic control system ( UTCS), considering the man-machine system characteristics of CPS, and in the light of relevance, conflict, and solution method of both systems, a fusion framework for urban traffic control and route guidance based on the CPS was proposed. This framework involves computation, communication, control, and physical components that facilitate the enhancement of the fusion degree of the UTFGS and the UTCS. The proposed framework focuses on the technical analysis of the feasibility of the depth fu­ sion of both systems and provides a theoretical basis for the implementation of urban traffic control and route guidance fusion in intelligent traffic systems.

Highly uniform solid-phase Zn-diffusion technique was developed to fabricate transparent windows for 650 nm red laser diodes (LDs). The maximum output power was up to 120 mW, which is three times higher than that for LDs without window structure. The LDs showed excellent thermal characteristics and aging reliability with TO-can package. The characteristic temperature was estimated to be 85 K in the temperature range of 25~65 °C. The LDs showed stable operation of 10 mW at a high temperature of 75 °C. After aging test of 2000 h, the elevated operation current was less than 3%, compared to the initial value. The predicted life time was over 10000 h for 10 mW operation at 75 °C.

Feeder system is an important part of the distribution system, which is not only shouldering the mission of fulfilling social responsibility, but also related to economic benefit of power supply companies. In the traditional planning method of feeder system, power supply reliability is implicitly reached by “N-1” criterion, but it is not particularly effective in reducing costs and handling budgets. Therefore, this planning method does not meet distribution network differentiation and meticulous management requirements and it's difficult to protect the interests of power supply companies and consumers, unable to adapt to future development needs of distribution network. In this paper, based on the different requirements for power supply reliability in different regions, the key elements of feeder system (feeder capacity, zone, segmentation, protection, switching time, etc.) and their flexible configuration method were proposed. Based on coordination accident support capacity of different zone switching mode and transfer capability for feeder system, feeder system planning method that supports feeder layer outage, transformer outage and substation outage and the overall process of feeder system reliability design were put forward, to ensure planning scheme achieve satisfactory electrical performance, accident control, optimal power supply reliability and economy. Finally, distribution network optimal planning in high reliability demonstration area of a city was selected as an actual case and satisfied planning scheme was obtained, to verify the effectiveness of the proposed planning methods.

Background The prevalence of hypertension in Chinese Mainland has increased rapidly in the recent decades. This study aimed to determine the prevalence of hypertension and sodium intake in an economically booming area in China. Methods 9600 adults aged from 18 to 69 years old in Jiangsu Province of China were recruited using a complex, multistage sampling method. Blood pressure was measured and a face-to-face interview was conducted among all participants. 24 hours (24-h) urine sample was collected from each participant and then measured for sodium and potassium. Hypertension was determined by blood pressure and use of anti-hypertension medications. All of the analyses were weighted according to the population distribution in the province. Results Overall, the weighted means of systolic blood pressure (SBP) and diastolic blood pressure (DBP) were 128.8 mm Hg (95 % confidence interval, CI, 128.3–129.3) and 82.2 mm Hg (95 % CI, 81.4–83.1). The weighted hypertension prevalence of Jiangsu residents was 33.0 % (95 % CI, 29.4–36.7 %). Among those with hypertension, 31.4 % (95 % CI, 24.6–38.1) were aware of their blood pressure condition. In total, 88.4 % (95 % CI, 83.5–93.3) of those with known hypertension took anti-hypertension medications. Only 23.7 % (95 % CI, 13.3–34.2) of those under anti-hypertension medications had their blood pressure controlled. The mean of 24-h urinary sodium excretion was 188.2 mmol (standard deviation, SD, 69.5), representing that the mean intake of salt was 11.0 g (SD, 4.1) through conversion. Conclusion Hypertension and excessive sodium intake in adults are prevalent in Jiangsu Province, China. These observations suggest that a public health approach is necessary to prevent hypertension and manage hypertensive patients. Electronic supplementary material The online version of this article (doi:10.1186/s12889-016-2712-y) contains supplementary material, which is available to authorized users.

The advantages of hybrid HCR have not been fully displayed because recently planning and scheduling of hot strip mill seldom consider how to avoid slabs with extremely different temperatures charging into the same reheating furnace. In this paper, the method base on specific reheating furnaces is proposed and both ant colony algorithm and simulation method are designed to solve the problem. Production data from one steel company is used for model validation.

To solve the hot rolling batch planning problem in production scheduling of iron and steel enterprises, a hot rolling batch planning model is formulated based on multiple travelling salesmen problem(MTSP) model. The objective is to minimize the total limit penalty value of adjacent stripped steels in width, thickness and hardness. The main constraints include jumps in width, thickness and hardness between adjacent stripped steels, which are essential for steel production process. An improved genetic algorithm is designed to solve the model. A simulation example shows the reasonability of the model and validity of the algorithm.

Construction safety monitoring is an important approach to prevent collapse of scaffold shoring system during concrete formwork. In this article, the causes of the collapse of scaffold shoring system are investigated. A monitoring system based on the Internet of Things(IoT) is then proposed, consisting of wireless sensors, wireless monitor, wireless alarm, monitoring cloud platform and mobile client. The monitoring system is then put into practical application and has successfully detected the malfunction of the monitored system, which proves the efficiency and reliability of the monitoring system.

High-grade prostatic intraepithelial neoplasia (HGPIN) is the most likely precursor of prostate cancer, but the frequency and timing of epigenetic changes found in prostate carcinogenesis has not been extensively documented.Here, we performed a differential proteomic profiling study on the serum of HGPIN and prostate cancer patients. Eleven HGPIN patients were enrolled, their serum protein patterns (2D-electrophoresis and mass spectroscopy) were compared with fifteen prostate cancer patients, and the follow-up study was further performed in the HGPIN patients.We described eleven altered protein spots in these two groups, in which pigment epithelium-derived factor (PEDF) was found to be significantly down-regulated in prostate cancer patients, which was further confirmed by ELISA method. In addition, 18.2% (2/11) of the HGPIN revealed strong expression for PEDF, 27.3%(3/11) showed a moderate expression and 54.5% (6/11) a weak PEDF expression in immunohistochemistry study, while in prostatic cancerous cells, 100% patients (15/15) revealed a weak expression for PEDF. The ten months' follow-up study demonstrated that 2 of 6 HGPIN patients with weakly expressed PEDF were found to have subsequent prostate cancer.our data identified PEDF in HGPIN as a significant predictor of subsequent cancer, suggesting that PEDF implies in prostatic tumorigenesis and may be used to identify the patients with isolated HGPIN who are at high risk for cancer onset in the disease process.

This article has been retracted at the request of the chief editor(s) and author(s). Reason: this article has been retracted as it plagiarises an earlier article published by Dr Schwab in Stroke 32, 2033–2035 (2001).

The authors discuss the concept of meta-information which is the description of information system or its subsystems, and proposes algorithms for meta-information generation. Meta-information can be generated in parallel mode and network computation can be used to accelerate meta-information generation. Most existing rough set methods assume information system to be centralized and cannot be applied directly in distributed information system. Data integration, which is costly, is necessary for such existing methods. However, meta-information integration will eliminate the need of data integration in many cases, since many rough set operations can be done straightforward based on meta-information, and many existing methods can be modified based on meta-information.

e20636 Background: Activation of MET oncogene as the result of amplification or activation MET exon 14 mutations represents an emerging molecular target for non-small cell lung cancer (NSCLC) treatment. MET exon 14 mutations account for 1.0% in Chinese NSCLC patients. However, few data have been reported on the coexisting of MET exon 14 mutations and EGFR mutations in NSCLC. Moreover, the clinicopathological characteristics and targeted therapy of these MET/ EGFR-coexisting patients remain elusive. Methods: Next-generation sequencing was performed on the DNA of 969 patients and Sanger sequencing was conducted on cDNA of 621 patients for MET exon 14 mutations in NSCLCs. EGFR mutations were determined by direct DNA sequencing. Results: Fifteen patients harbored positive MET exon 14 mutations. Frequency of concomitant EGFR and MET exon 14 mutations was 0.2%(3/1590). 3 patients with concomitant MET exon 14 mutation and EGFR activating mutation were all female, never smokers and adenocarcinoma. Their stagings were stageⅠB (n = 1) and stage Ⅳ(n = 2). The stage ⅠB patient harboring concomitant MET exon 14 skipping and EGFR L858R mutation did not relapse 2 years after operation. The other two stage Ⅳ patients received first-line gefitinib. Case one harbored concomitant MET exon 14 point mutations (IVS13-36G > A) and EGFR exon 19 deletion, and showed resistance to gefitinib with progression free survival(PFS) of 2 weeks and overall survival(OS) of 1 month. Case two had concomitant MET exon 14 point mutations (IVS13-36G > A) and EGFR L858R mutation. Meanwhile, she also had both METamplification and c-Met overexpression at the baseline. She showed partial response (PR) to gefitinib with 3.8 months PFS. Then she was enrolled in a clinical trial (NCT02374645) to receive volitinib plus gefitinib on December 20, 2016. Initial response was good PR on January 24, 2017. Only grade 1 rash was observed. Conclusions: Coexisting MET exon 14 /EGFR mutation is an uncommon molecular event in NSCLC patients. Such coexisted patients might show relative resistance to EGFR inhibitor. However, combination of MET and EGFR inhibitors will be potentially a good strategy to overcome such a relative resistance for MET exon 14 /EGFR co-mutant patients.

Currently, China has just started micro-grid development, and has not yet formed a mature commercial operation mode, by study of foreign micro-grid operation mode and domestic micro-grid development, this article will introduce four micro-grid operation modes applicable to China, including grid operation mode, investors operation mode, joint operation mode, users operation mode, and analyze the different trade and settlement modes. Key factor affecting micro-grid investment income is the cost, covering body cost, grid-connection cost and maintenance cost. Technical and economic analysis of micro-grid consists of power system computation, micro-grid system optimization and investment revenue analysis. This paper will mainly analyze the investment revenue of micro-grid project, calculate the cost of investment, pay back period, electricity cost of three micro grids, covering a city micro grid, a remote area micro-grid and an island stand-alone micro-grid, at last, it will analyze the features, advantages and disadvantages.

Aiming at the character and difficulty of comprehensively evaluation and fault diagnosis in gun control system, based on fuzzy analytic hierarchy process(F-AHP), the evaluating indicator architecture is established. Membership functions of voltage signal, current signal, flux signal, and I/O signal are proposed, and the weight of each quality is calculated. Based on the difference weight and fuzzy mathematic theory, the process of fault diagnosis is optimized, at the same time the performance is evaluated. Finally, the system is applied successfully in practice.

In order to solve the problems existing in the fault diagnosis of tank fire control system, such as bigger subjectivity and less accuracy, a fault diagnosis model based on BP (Back Propagation) is studied. The working conditions of tank fire control system are described with a group of state parameters. A fault diagnosis model is established and a self adaptive variable BP learning algorithm is designed. Finally, a simulation is conducted with MATLAB. The results show that the convergence time of this algorithm is short, and this model is able to make fire control system fault diagnosis rapidly and accurately.

The paper investigates whether and how the power's balance can affect the performance of Japanese listed companies. With sample data of companies listed on Tokyo Stock Exchange, it was interpreted that Tobin's q (Q) and ROA (Return on Assets) could be regressed on Z (the radio of large shareholders) and L, I, F (the dummy variables of different large shareholders). By the empirical result, the dummy variable of institutional investors in any ranking is always positive related to ROA. The dummy variable of legal investors is negatively related to Q and ROA at 1% significant level only when they are the largest shareholders. In the other rankings, legal shareholders have no significant impacts on Q and ROA. As the largest shareholders, the foreign investors' dummy variable is positively related to Q and ROA. When the foreign investors are the second largest shareholders, their dummy variable has not impacts on Q and ROA.

With the deregulation of the Chinese agricultural market, competition becomes increasingly fierce in agricultural circulation enterprises, leading to the reduction of profits. More and more enterprises have developed the concept of cooperative competition to seek strategic cooperation with upstream agricultural suppliers. In the cooperation process, performance evaluation on supplier collaboration is one of the crucial issues for current research. The work identified the key affecting factors on collaborative performance from product competitiveness, communication skills, operations capability and information sharing capabilities, and applied fuzzy analytical hierarchy process to evaluate collaborative performance of agricultural suppliers. The results revealed the importance of the supplier collaboration and proposed the way of improving collaborative performance.

This text based on the scattering principle of lubricating oil to near-infrared light, fully used the computer monitor technology, designed the plan of making use of near-infrared light to monitor automobile lubricating oil, and hereby it to monitor the deteriorated condition of lubricating oil. The experiment has proved that: this kind of technology for monitoring automobile lubricating oil can satisfy the deterioration condition monitor demand of automobile lubricating oil, and can give the instructions of the lubricating oil deterioration degree, so we can decide whether the lubricating oil can continue to use according to it. This method changed the traditional conditions that replace the lubricating oil according to time or the travel course number, it realized replacing lubricating oil according to the quality, thus it make the lubricating oil obtain the reasonable economy service life, and guaranteed the good lubrication condition of vehicles.

With large scale increases of the train speed, it is of great practical significance to develop a fatigue test stand for high-speed train's transmission system. 3-DOF (three degree-of-freedom) electro-hydraulic shaking table for high-speed train's transmission system fatigue test is designed and its three dimensional mathematical model is established in this paper. In addition, static analysis and modal analysis of this shaking table are carried out by finite element analysis software. The results show the rationality of our mechanism design. The above research work lays the foundation for structural improvement and optimum design of shaking table.