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[Introduction] The fuel cell distributed generation technology is an important application direction to adapt to the future development trend of low-carbon, clean and high-efficiency energy. There are few domestic fuel cell power station projects , and there is a lack of actual project experience accumulation. In order to promote the application of fuel cell distributed power station technology, the research outlined the current application status at home and abroad, summarized the advantages and disadvantages of high temperature fuel cells, investigated domestic fuel cell construction and application cases, and established solid oxide fuel cell (SOFC) and molten carbonate fuel cell (MCFC) power generation system processes. [Method] After literature research and field research, two fuel cell distributed generation technologies suitable for the construction of large-scale power stations were identified. Chemical simulation software AspenPlus was used to establish the process model, electrochemical model and energy analysis model for the fuel cell system, and the performance simulation analysis of the system was carried out. [Result] The analysis results show that they are consistent with the actual operation results and the system performance trend predicted by the analysis is consistent with the existing research. [Conclusion] The simulation method can be used in the research of MW-level high-temperature fuel cell distributed generation system, and can provide data support for expanding the application scale of fuel cells.

The multi-task convolutional neural network (MTCNN) face detection algorithm has a low detection rate of small faces in classroom scenes. An improved MTCNN algorithm that integrates context features was thus proposed. Firstly, the context convolution module was integrated with the R-Net layer network of the MTCNN model, and the feature map receptive field was expanded to obtain more small face information. Secondly, the deconvolution layer and the max-pooling layer were introduced to solve the problem of inconsistency of feature fusion data dimensions. Finally, the O-Net layer network of the MTCNN model integrated the context convolution module to further extract the small face feature information, and two convolutional pooling layers were introduced for feature fusion. The experimental results show the detection accuracy increased by 3% on the FDDB data set, the face detection recall rate and the F1 score increased by 8.69% and 4.94% respectively on the classroom scene data set compared with those of MTCNN algorithm.

China is a major agricultural country, and the production of agricultural waste is increasing year by year. However, the utilization rate of resources is still low. Anaerobic dry fermentation technology is mainly used to treat solid organic matter with a total solid content of 20%~40%(wt). It is an effective way to recycle agricultural waste resources, which has the advantages of low water consumption and high volumetric gas production rate. Due to the high solid content, there are still some problems in the anaerobic dry fermentation technology, such as slower reactor start-up, difficulty in mixing materials, and poor heat and mass transfer. Therefore, the innovation of anaerobic dry fermentation equipment and optimization of process parameters will directly affect the further promotion and application of this technology. The research and application status of anaerobic dry fermentation technology at home and abroad in recent years were summarized, the operating characteristics of typical batch and continuous anaerobic dry fermentation reactors were compared, and the effects of main process parameters on anaerobic dry fermentation were analyzed. The shortcomings of the current anaerobic dry fermentation technology were presented, and the future development trend of the technology was prospected in terms of technical equipment and process research, which is to develop design methods for key links in anaerobic dry fermentation equipment, and to carry out in-depth research on mechanisms, such as biogas residue rheological properties and microbial dynamic changes, etc.

Objective To analysis the safety and outcome of intravenous thrombolysis with recombinant tissue plasminogen activator (rt⁃PA) in patients with acute mild ischemic stroke. Methods From November 2017 to October 2018, 252 patients with acute mild ischemic stroke who were admitted into our hospital within 4.50 h after onset (84 patients in intravenous thrombolysis group, 108 patients in aspirin and clopidogrel group, and 60 patients in aspirin or clopidogrel group). The general condition, the level of high⁃sensitivity C⁃reactive protein (hs⁃CRP) and erythrocyte sedimentation (ESR) were compared among 3 groups. The modified Rankin Scale (mRS) were evaluated on 7 d after admission or at earlier discharge, and 21 and 90 d. Symptomatic intracranial hemorrhage rates were compared among 3 groups. Results There were no significant difference in general clinical data, the initial level of hs⁃CRP and ESR between the intravenous thrombolytic group and the 2 non⁃thrombolysis groups. At 7 d after admission or earlier discharge, the descending range of hs⁃CRP and ESR in 3 groups were significant (P = 0.000, for all); there were significant differences among the 3 groups (P = 0.000, for all); pairwise comparison of 3 groups showed that the levels of hs⁃CRP and ESR in intravenous thrombolytic group at 7 d were significantly lower than aspirin and/or clopidogrel group (P = 0.000, 0.000; P = 0.000, 0.010). There was no significant difference in the rate of intracranial hemorrhage between thrombolytic group and other 2 groups at 24 h after treatment [1.19% (1/84) vs. 0 (0/168); χ 2discharge, the intravenous thrombolytic group had better prognosis than aspirin and/or dopidogrel group (P = 0.043, 0.012); At 21 and 90 d, the intravenous thrombolytic group had better prognosis than aspirin or clopidogrel group (P = 0.021, 0.037); but compared with aspirin and clopidogrel group, there was no significant difference (P = 0.070, 0.053). Conclusions Patients with mild ischemic stroke, especially that may induce disability should be treated with rt⁃PA intravenous thrombolysis timely. If it impossible by any causes, aspirin and clopidogrel should be given within 24 h after onset. DOI：10.3969/j.issn.1672⁃6731.2019.12.012

Objective To understand the characteristics of patients in the emergency observation room, analyze the factors influencing death, and provide orientation for improving the level of emergency treatment in the hospital. Methods The data of all patients discharged from the emergency observation room in a tertiary hospital in Shanghai from January 1 to December 31, 2019 were collected. The patients were divided into the death group and the survival group based on their outcome. The clinical data of two groups were compared, and the characteristics of death cases were analyzed. Results In 2019, there were 2 211 patients discharged from the emergency observation room, including 125 deaths and 2 086 survivors. Among the surviving patients, 1 183 were discharged (accounting for 56.71%), and 903 were admitted to specialized departments for further treatment (accounting for 43.28%). The median (25th, 75th percentile) observation time was 2.50 (1.00, 9.00) days, and 1 076 patients (accounting for 48.67%) had an observation time longer than 72 h. The average age was (67.81 ± 18.87) years, and males accounted for 57.98% (1 282 cases). The death group had a higher incidence of respiratory system diseases and malignant tumors than the survival group, while the survival group had a higher incidence of nervous system diseases (P < 0.01). The frequencies of using non-invasive ventilators and electrocardiogram monitoring in the death group were higher than those in the survival group (P < 0.01). The peak period of death occurrence was mainly in the winter. The multivariate logistic regression analysis showed that the risk of death increased to 1 . 057 and 1 . 013 times for every 1 year increment of age and every 1 day increment of staying in observation time, respectively (P < 0.001); the risk of death for patients with two or more diagnosed diseases was 3.873 times that of patients with one diagnosis (P < 0.001); compared with patients from the clinic, the risk of death for patients from the rescue room increased to 2.877 times (P < 0.001). Conclusions The hospital should standardize the triage and treatment of critically ill and complicated patients, allocate and distribute emergency resources reasonably, and strengthen the observation of the condition. Effective prevention and treatment strategies should be formulated based on high-risk factors such as old age, respiratory system diseases, tumors, and seasonal variations to improve the efficiency and quality of emergency treatment. [ABSTRACT FROM AUTHOR]

From the perspective of rural revitalization, the rural industrial development is an important means to consolidate and expand the achievements of poverty alleviation, a powerful starting point for the transformation and upgrading of industrial poverty alleviation to industrial prosperity, and a key to realizing the convergence of poverty alleviation to rural revitalization. In order to further promote the development of rural industries, the connotation and characteristics of the involution of rural industrial development were studied, and the status of the involution of rural industrial development under the background of rural revitalization was actively explored. Then, the countermeasures were put forward including fostering a variety of new forms of business to promote the sustainable development of rural industries, promoting the sustainable development to achieve the new economic stability, promoting the high-quality development of agricultural and rural areas to help the implementation of rural revitalization strategy, and improving the endogenous power of farmers to promote the realization of common prosperity, so as to achieve the goals of rural industrial de-involution development. [ABSTRACT FROM AUTHOR]

Objective: To investigate the main problems in the pharmaceutical care of Klebsiella pneumonia-carhapenemase-producing Klebsiella pneumoniae (KPC-Kp) infection in a patient combined with severe acute pancreatitis and hepatic failure. Methods: The pharmaceutical care of a specific case was introduced from the aspects of the choice of initial anti-infective drugs, the optimization of antiotic regimens for KPC-Kp infection and prevention and control of adverse drug reactions (ADRs). Results: Based on the pathophysiological conditions of the patient, optimal medication strategies were proposed and careful pharmaceutical care was provided by the clinical pharmacists. As a consequence, good therapeutic efficacy was achieved. Conclusion: Pharmaceutical care of the patient included development, adjustment and optimization of anti-infective regimens, as well as prevention and control of ADRs. [ABSTRACT FROM AUTHOR]

Test automaton is an important factor for the quality of Android applications. In order to improve the efficiency of automaton, test case generation and the ability of abnormity discovering in traditional automated testing of Android application, an automatic test method for Android application was proposed based on particle swarm optimization algorithm, named particle swarm optimization for Androdd (PSOA). The PSOA method was arranged with three functions, including information collecting of control units, test process modularizing, test case generating and test data optimizing with the particle swarm algorithm. Experimental comparing with traditional automated test, the proposed method can successfully improve the ability of abnormity discovering, the efficiency of test case generation and the rate of automation. [ABSTRACT FROM AUTHOR]

From the co-evolutionary viewpoint of "information diffusion - right game", the paper builds the co-evolutionary game model of mass emergency derived from environmental pollution, and then makes multi-agent social simulation analysis under the platform of NetLogo. The research results show that mass emergency derived from environmental pollution has two types of co-evolutionary path: one is the "not in my back yard" with "negotiation - unblocked information - rational collective protest", the other is the mass emergency with "black case operate - information overflow - irrational collective protest". Under the different scenarios of payoff and information parameters, there are various results of evolutionary equilibrium. As the exterior disturbance, the degree of information management by local government leads to the phenomenon of "evolutionary equilibrium drift". Local government can not only choose the game structure of negotiation which respects the right to know and participate of nearby residents, but also strengthen the information management, so as to impel the nearby residents to accept the disposal method. [ABSTRACT FROM AUTHOR]

Sexual and asexual propagation of Xanthoceras sorbifolia natural populations in different habitats and their importance in population regeneration were studied. The results showed that X. sorbifolia populations were capable of the sexual and asexual propagation in 3 slope aspects, but a balance between the two propagation modes was observed. In sunny and semi-shady slope habitats, seedling amount and space-occupying competence were relatively high, suggesting that the sexual propagation was dominant. In semi-sunny slope habitat, the populations were superior in sexual sprout amount and space-occupying competence, suggesting that the predominant propagation mode was asexual. In the same habitats, asexual sprouts grew better than seedlings, while the growth of seedlings was in the order of sunny slope>semi-sunny slope>semi-shady slope on the basis of the same origin. The bottleneck stage appeared from seeds to seedlings for sexual propagation and from seedling to ramet for asexual propagation. X. sorbifolia invaded and settled in a way of sexual propagation in new habitats, and then rapidly occupied habitat space in a way of asexual propagation. [ABSTRACT FROM AUTHOR]

In order to clarify the heat stress effects, under ambient air temperature and humidity, on thermoregulation, psychological responses, autonomic nervous and salivary amylase activity of the human body, 6 young fem ale subjects we a ring only shorts and a brassiere were exposed to 9 conditions consisting of air temperature of 28°C, 31°C and 34°C and 30%, 60% and 90% relative humidity for 60 minutes. The results of the analysis of variance are summarized as follows: Mean skin temperature, sweat rate, sKin moisture were significantly increased with an increase in air temperature and humidity, but rectal temperature showed no significant differences. Thermal, humid and uncomfortable sensations changed to the uncomfortable side w ith increasing temperature and humidity. ③ Heart rate, LF (Low Frequency)/HF (High Frequency) and salivary amylase activity were significantly increased with an increase in air temperature and humidity, while HF showed only tendency to be decreased. ④ High correlation coefficients between SKin moisture and uncomfortable sensations (r=0 .888),humid sensations (r=0.982),salivary amylase activity (r=0958) and LF/HF (r=0.910), suggested a dominant indicators of the heat stress. S a livary amylase activity and LF/HF were also suggested as an effective indicator of heat stress. [ABSTRACT FROM AUTHOR]

Based on the transmission equation of acoustic wave in a layered media, the absorption coefficient of the multilayer porous material backed with an air gap is calculated. Taking a double-layer Aluminum foam backed with an air gap for an example, the effect of acoustic parameters of each layer and thickness of air gap on the absorption coefficient is analyzed. The results show that the absorption coefficient of the sound absorption structure with an air gap gradually increases with the increase of porosity, thickness, and flow resistivity of each porous material respectively. At low frequency, increasing the thickness of air gap will lead to the increase of the absorption coefficient, and the maximum absorption coefficient shifts towards lower frequencies. At intermediate frequency, the sound absorption structure without the air gap shows a better sound absorption property when the porosity or flow resistivity are increased. Therefore, the sound absorption level can be achieved in a wider frequency range through the adjustment of material parameters of each layer. [ABSTRACT FROM AUTHOR]

A geometrical model for geometrical localization of T²-R multistatic sonar is established. A multistatic time-bearing-localization (MTBL) algorithm is proposed, and the error of geometrical dilution is presented. The effects of baseline length, sonar deployment and measurement error on the localization accuracy of algorithm are studied through numerical simulation, and other indispensable influencing factors are qualitatively analyzed. The simulation results show that the localization accuracy in most regions is improved with the increase in length of baseline. For the given deployment mode, the localization accuracy is sensitive to the time measurement error, but the bearing measurement error has a limited impact on the performance of the algorithm. The proper deployment of sound sources can enhance the mean localization accuracy. The study provides a well theoretical evidence for underwater localization of T²-R multistatic sonar. [ABSTRACT FROM AUTHOR]

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In order to examine the quantitative effects of moisture permeability of clothes on clothing climate, blouse type film clothes made of films with different porosities, that is, having a holes of Omm, 3mm, 6mm and 7.5mm in diameter per 4 cm² respectively, were made and used for wearing test in a climatic chamber at 34°C and 50%. The temperature and humidity inside the film clothes, sweat rate and subjective ratings such as humid and comfort sensation were determined. The subjects consisted of 7 young females. The results were summarized as follow: ①Air and moisture permeability of the film increased and thermal insulation decreased with increasing porosity. ②As results of the analysis of variance on wearing tests, both factors A (porosity of film clothes) and B (experimental condition) showed a significant difference of 1% level for each temperature and humidity inside the clothes, and only factory A showed a significant difference for the sweat rate. ③Both heat resistance (Rd) and evaporative heat resistance (Re) of the film measured through a skin model test decreased with the porosity of the film in the case of an existing air layer beneath the film. ④Re showed a high correlations with humidity inside clothes and sweat rate, suggesting that Re was a dominant factor for determining the clothing climate, sweat rate and comfort sensation of subject. ⑤In addition, the difference between moisture permeability of perforated film and textile clothes was discussed. [ABSTRACT FROM AUTHOR]

Taking the natural Quercus variabilis forest in Shangluo, south slope of Qinling Mountains as the object in May 2006 and August 2011, which was under close to natural management of different thinning intensities (30%, 20%, 10%), and the un-thinned forest as the control, changes of the stand growth situation before and after thinning, population regeneration, species diversity and soil fertility after 5 years of thinning were analyzed, and the effects of thinning on forestland revegetation and community development were evaluated comprehensively. The results showed that the number of 1-6 years old Q. variabilis seedlings increased with increasing thinning intensity, while no significant difference was found for above 6 years old seedlings. The regeneration potentials of population under 10%, 20% and 30% thinning were respectively increased by 10.8%, 28.5% and 32.9% compared with the control. Thinning promoted the DBH and crown of the trees and shrubs, as well as the height of shrubs, especially for light-loving plants, and the effect of promotion increased with increasing thinning intensity. The species diversity and soil fertility were improved after thinning, in order of 30% > 20% > 10% > control. The thinning intensity of 30% (canopy density 0.6) was more conducive to the continuable development of the natural Q. variabilis forest in which canopy density was above 0.85. [ABSTRACT FROM AUTHOR]

Aiming at the issues that robustness and security of most image watermarking are not strong, a digital watermarking algorithm based on multi-factor encryption and Contourlet transform is proposed. Using the good pseudo randomness and mathematical statistical characteristics and the advantages of simple and quickly generated sequences of Chebyshe map, three chaotic sequences are Produced. Two of them are used to encrypt the watermarking image, the left one is used as watermarking embedded keys; The Contourlet Transform is used to extract the sub-band coefficients of the original carrier and the encrypted watermark, then the coefficients of the watermark is embedded into the coefti-cients of the original carrier, thus accomplishing the watermark embedding process. The method is implemented and experiments are performed to compare the proposed method with other methods in literatures. The resutt shows that the algorithm owns better effect on robustness, security and invisibility. [ABSTRACT FROM AUTHOR]

With the maturity and popularization of the database techniques, datasets which are stored in computers become larger and larger. People are already not only satisfied with the data management, but also hope to analyze data, finding knowledge and information from large numbers of datasets. Pixel-oriented visualization techniques stand out from other visualization techniques with advantages of its effectively analyzing and dealing with large scale database. With the comprehensive contrasts of several classic visualization techniques from tje time efficiency and the display results, the paper proposes a method to realize the data visualization which based on the pixel techniques. This new method applies the high-efficiency scan line seed fill algorithm to making the large scale datasets switch into different color pixels and then displaying them in the structured pixel mapping model. It provides guidance to a macroscopical analysis of the changing regularity to large scale datasets, and greatly improves the efficiency of the algorithm. [ABSTRACT FROM AUTHOR]

With the selection of Geldart B type magnetite powder as medium solids, we investigated the density distribution characteristic of the fluidized bed along the directions of bed heights and axial positions, by combining the experimental measurement and numerical simulation based on the Euler-Euler multi-phase model. The results indicate that the distribution range of bed densities along bed heights and axial positions are 1.95-2. 10 g/cm³ and 2.00-2. 10 g/cm³ respectively with the operating gas velocity of 1.50Umf ≤ U ≤ 2.20Umf, and the standard deviation both less than 0.20 g/cm³. The density stability of axial positions is better than the density stability along different bed heights. Therefore, we should pay close emphasis to maintain the density fluctuation along bed heights as least as possible, which aims to improve the density stability in the whole ADMFB. It shows good agreements of the experimental measurement and numerical simulation results. [ABSTRACT FROM AUTHOR]

In August-November 2010 and August 2011, and taking the pure Quercus variabilis forests under close-to-natural management of different thinning intensity (30%, 20%, and 10%) in Shangluo district of south slope of Qinling Mountains as the object, an investigation was conducted on the seed amount of seed bank, the survival rate and growth status of seedlings, and their relationships with environmental factors 4-5 years after thinning. As compared with the control, the seed amount in the seed bank of 10%, 20%, and 30% thinning plots increased by 2.0%, 21.1%, and 34. 8%, respectively in the fourth year after thinning, and the 1-year-old seedlings amount increased by 28. 5%, 99. 7%, and 122. 2%, respectively in the next year. The survival rate of the seedlings in the 10%, 20%, and 30% thinning plots was increased by 25.5%, 235.7%, and 480. 0%, respectively in the fifth year after thinning. Thinning improved the light, temperature, soil moisture, and soil nutrient conditions in the forests, which promoted the heightand new shoot growth and the leaf area index of each age seedlings. The three growth indices also increased with increasing thinning intensity. In the Q. variabilis forest with a canopy density of ≥ 0. 85, the thinning intensity 30% (canopy density 0. 6) was most conducive to the seed germination and seedling growth. [ABSTRACT FROM AUTHOR]

A sampling plot investigation was conducted on the seedling regeneration, stand growth, species diversity, and soil characteristics in a Pinus tabulaeformis plantation in Huanglong Mountain on the Loess Plateau of Northwest China after 7 years of close-to-natural management thinning 15% (light thinning), 30% (medium thinning), and 45% (heavy thinning), with the effect of different thinning intensities evaluated. With the increase of thinning intensity, the amount and growth indices of 1-7 years old P. tabulaeformis seedlings increased, but the mean annual increments of the growth indices decreased after an initial increase, with the maximum under medium thinning. As compared with the control (un-thinned plantation), the individual volume under light, medium, and heavy thinning was increased by 20. 9%, 32. 1% and 52. 6%, the volume per hm2 decreased by 4. 4%, 15. 1%, and 25. 3%, and the mean annual growth rate of volume increased by 28. 6%, 46. 2% and 82. 0%, respectively. The species diversity and soil characteristics were improved under thinning, with the order of heavy thinning > medium thinning > light thinning > un-thinning. In this study, 45% thinning was most suitable to the management of P. tabulaeformis plantation in Huanglong Mountain. [ABSTRACT FROM AUTHOR]

To achieve effective integration of production monitoring systems within various workshops, and the sharing of data resources in the LAN (local area net), on the basis of the existed monitoring systems, first, a common data interface was developed, and datum in heterogeneous database were effectively integrated. Then, two technical difficulties that are network management and data security were studied, and the corresponding solutions were designed via database technology, network technology and RBAC (Role-Based Access Control) theory, etc. Meanwhile, work principle of the system was introduced. Finally, a networking integrated monitoring system was developed for the textile enterprise. The application results show that the integrated monitoring system has achieved effective integration of heterogeneous databases, solved the problem of data isolation, and realized the sharing of production data within local area net. [ABSTRACT FROM AUTHOR]

According to the recorded air temperature data and their continuity of each weather station, the location of each weather station, the numbers of and the distances among the weather stations, and the records on the weather stations migration, several weather stations in Liaoning Province were selected as the urban and rural representative stations to study the characteristics of urban heat island (UHI) intensity in the province. Based on the annual and monthly air temperature data of the representative stations, the ranges and amplitudes of the UHI intensity were analyzed, and the grades of the UHI intensity were classified. The Tieling station, Dalian station, Anshan station, Chaoyang station, Dandong station, and Jinzhou station and the 18 stations including Tai'an station were selected as the representative urban and rural weather stations, respectively. In 1980-2009, the changes of the annual UHI intensity in the 6 representative cities differed. The annual UHI intensity in Tieling was in a decreasing trend, while that in the other five cities was in an increasing trend. The UHI intensity was strong in Tieling but weak in Dalian. The changes of the monthly UHI intensity in the 6 representative cities also differed. The distribution of the monthly UHI intensity in Dandong, Jinzhou and Tieling took a "U" shape, with the maximum and minimum appeared in January and in May-August, respectively, indicating that the monthly UHI intensity was strong in winter and weak in summer. The ranges of the annual and monthly UHI intensity in the 6 cities were 0.57-2.15° and -0.70-4.60 °, and the ranges of 0.5-2.0° accounted for 97.8% and 72.3%, respectively. The UHI intensity in the province could be classified into 4 grades, i. e. , weak, strong, stronger and strongest. [ABSTRACT FROM AUTHOR]

Experimental measurement and numerical simulation were combined to conduct the research of dynamic fluid bubble behaviors in the dense gas-solid fluidized bed with high densities, which is applied in the dry beneficiation. Mean diameter of the bubbles and their rising velocity were calculated and analyzed, which have a significant influence on the stable condition and uniform density distribution of the fluidized bed. The results indicate that the mean diameters among transverse and axial directions are 35 mm

An associated heterotrophic dominant single bacteria-Z-QS01 was selected to study its mechanism of quorum sensing and factors that affected quorum sensing using ecotoxicological technique in co-cultural system with Chlorella vulgaris. The results show that self-regulation and inhibitive effect of bacteria-Z-QS01 to Chlorella vulgaris could implement through excreting chemic substance. Density of bacteria-Z-QS01 and concentration of chemic substance excreted by bacteria-Z-QS01 are the necessary conditions, which decide whether the regulation mechanism could be carried out or not. The enhanced UV-B radiation could affect quorum sensing of bacteria-Z-QS01 significantly, and the inhibitive effect to Chlorella vulgaris is decreased gradually with the dose increase of UV-B radiation. [ABSTRACT FROM AUTHOR]

In DTN, the current routing forwarding strategies include flooding method based on copy and forwarding method based on knowledge. In order to deliver more messages with less knowledge oracle, a new routing algorithm which calculates the delivery predictability using the history contact information is proposed. The algorithm combines copy strategy and probabilistic routing. When one node meets the other node, a message is transferred to the other node if the delivery predictability to destination is higher at the other node. Binary mode copy strategy is used to distribute a message to a number of nodes to increase transmission rate and an active mechanism is used to delete redundancy messages. Simulation result shows this algorithm has a higher message delivery ratio than Epidemic, PROPHET and BSW. In addition, this superiority scales better with the buffer size and the number of nodes. [ABSTRACT FROM AUTHOR]

Geometrical parameters and lengths of legs often have close relations with the singularity of a Gough-Stewart platform. When these parameters are improperly selected, the platform may have hunt singularities. The relations among the geometrical parameters and the leg lengths when in hunt singularity for 3 -3,6 -3, 6 -6 Cough-Stewart are derived according to their geometrical constrains. The obtained relations can be used as a geometrical criterions, for a Gough-Stewart platform with given geometrical parameters, to determine if the mechanism may have or close to Hunt singularity in its workspace. Two experiments are performed, which validates the hunt singularity criterions. [ABSTRACT FROM AUTHOR]

A sampling plot investigation was conducted on the Quercus liaotungensis forests on Loess Plateau, China under close-to-natural management thinning 13.4% (light thinning) and 30.0% (heavy thinning). Taking the un-thinned forest as the control, the population regeneration, woodland productivity, soil fertility, and species diversity of the forests after 5 years of thinning were studied, with the community stability evaluated by calculating the subordinate function values based on fuzzy comprehensive evaluation. Comparing with the control, the regeneration potential of the forests after light and heavy thinning promoted by 14.2% and 20.2%, arbor volume reduced by 9.0% and 23.8%, shrub biomass increased by 7.3% and 12.2%, and herb biomass increased by 10.5% and 31.6%, respectively. In addition, the soil fertility and species diversity indices were higher in thinning forests than in the control. The community stability showed the order of heavy thinning forest > light thinning forest > un-thinned forest, suggesting that the close-to-natural management thinning 30.0% was more suitable to the management of secondary Q. liaotungensis forest on Loess Plateau. [ABSTRACT FROM AUTHOR]

The hydraulically driven 6-DOF parallel Gough-Stewart mechanism was used as a motion simulator to simulate the real motions of carrier for testing firing control systems in laboratory. The bidirectional force/torque versus velocity interactions between mechanical dynamics system and its hydraulic driving system was explored to establish an integrated dynamic model. Then the couplings of pose outputs were presented and experimental results show that the couplings between these outputs will become more intense with the increase of motion frequency within natural frequency of the Gough-Stewart mechanism. Moreover, for the safety of the motion simulator, a simple criterion which only uses the lengths of legs instead of complicated and time-consuming method of condition number of Jacobian is proposed to distinguish singular area from the workspace. Amplitude and Phase Control (APC) and random wave duplication techniques were employed to greatly improve the simulation fidelity not only for sine waveform but for random waveform as well. [ABSTRACT FROM AUTHOR]

An investigation was made on the water quality and plant community in 17 urban wetlands in east suburb of Nanjing City, and the spatial heterogeneity of the water quality was analyzed at ecosystem scale, catchment scale, and functional landscape scale. Wetland type and the characteristics of plant community were the main factors affecting the water quality at ecosystem scale. Primitive wetland had the best water quality, followed by reconstructed wetland, and secondary wetland. The higher plant coverage the wetland had, the better the water quality was. Land use type was the main factor affecting the water quality at catchment scale. Constructive land had greater effects on water nutrients content, while woodland mainly affected water dissolved oxygen. Human activity was the main factor affecting the water quality at functional landscape scale, and the effects differed with different water quality indices. [ABSTRACT FROM AUTHOR]

In order to achieve defect fabric data sharing within a local area network (LAN) for the textile mill, the effective integration of production management information in the finishing workshop, according to the actual requirements of the finishing workshop, the overall production technology process has been studied, a defect information management system based on Client/Server mode is developed. A common defect fabric coding regular and data integration strategy is put forward respectively via database and network technology, and one procedure algorithm is designed. As a result, the repeated defect name in various workshops is resolved, and the effective integration of production management information is realized. The technical difficulties during the system design are analyzed, main function of system, logical structure design of database are introduced. Practical application shows that defect information management system achieves the centralized management and common usage of the defect data, reduces labor cost of the textile enterprise, and improves the work efficiency of the finishing workshop. [ABSTRACT FROM AUTHOR]

To promote the development of textile information, solve the present condition of the production information can not be integrated and share in the LAN, a production information monitoring and control system are developed. First, the weaknesses that are from the existing computer monitoring system are analyzed, the structure model of system is designed via the techniques of database, network, communication and so on. Second, the technical problems in the system design process have been studied, and the corresponding solutions are proposed. Third, through the production monitoring and - control indexes, a system decision-making model is built by using the expert method and fuzzy control theory. As verified by application, being compared with the traditional system, the system has some obvious advantages, the comprehensive management and production information integration are achieved, as well as the production data share and scientific management decisions are realized. [ABSTRACT FROM AUTHOR]

In the early August of 2008, at the National Day Rally, Lee Hsien Loong announced that Singapore's government would open up the space for political expression in order to allow Singaporeans and young netizens to develop a greater sense of political involvement, and designate Hong Lim Park as the site for free outdoor demonstrations to give people more public space to express their views. The further opening of Hong Lim Park should be a good development in Singapore's democratic process. Any Singaporean with political consciousness can put forward constructive ideas and views on the various issues about the state and people's livelihood, which can encourage more Singaporeans to participate in politics, Of course, that opening is limited, for demonstration activities are still confined to the Speaker's Corner in the park. The fact that the Singapore government established outdoor demonstration sites somewhat reflects the initiative adaptation and natural selection the Singapore's government has made in response to the challenges from home and abroad. The act of the PAP government has animated Singapore's democratic politics, further improved Singapore's image as an open and cosmopolitan city, strengthened the mediation and feedback of public opinions, and showed a self-confident and friendly image of the government. [ABSTRACT FROM AUTHOR]

In order to improve the transfer efficiency while at the same time reduce the network delay and network cost in delay tolerant network(DTN), a DTN routing algorithm based on probabilistic delay, namely PD, is proposed. The link state algorithm is referenced in PD. Transfer delay, connectivity between nodes and historical factors are fully taken into consideration. Through simulative analysis, PD is found to be able to achieve better performance than CAR and epidemic routing in network environment with relatively long network transfer delay. [ABSTRACT FROM AUTHOR]

The capacitor discharge mash resistance welding used for joining thin steel sheet was put for ward. According to the physics parameters and size of sheet and type of mash resistance welding joint, the power of the stored welding machine was designed. The welding experiment proves the possibility of this welding technology and equipment for joining of thin steel sheet or zinc-coated steel sheet. [ABSTRACT FROM AUTHOR]

The paper investigated the effect of unequal countercurrent blood vessels on the temperature distribution during phased high intensity focused ultrasound (HIFU) treatment. A bioheat transfer model based on three heat balance equations was adapted for 3-D transient simulations. The simulation of this model using finite element method was carried out for the tissue with the 50~300 µm diameter paired blood vessels. Contribution from the vessel diameter, blood velocity and blood perfusion rate were compared and the influence on 3-D temperature distribution was estimated. The results show that the paired vessel diameter and the blood velocity are the crucial factors determining the distribution of temperature for HIFU treatment. Moreover, the model is able to give more precise information about the lesion volume of heated tissue. [ABSTRACT FROM AUTHOR]