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Aiming to address the problems of high cost, large size and complex structure of the traditional back-to-back three-level converter, this paper proposes a new dual-port three-level converter topology. This new topology reduces the number of switching devices and optimizes the system size through device multiplexing. Firstly, the operating principle of the proposed converter topology is analyzed in detail, outlining the six effective switching states, current flow paths, and corresponding dual-port output levels of the single leg, while also discussing and the voltage stresses of each switching device. Secondly, a level-shifting pulse width modulation for the proposed converter topology is investigated and designed, and the effect of modulating wave overlap is avoided by adding DC offsets. Thirdly, the key problems of the modulation scheme under both the common frequency and different frequency operation modes, such as the modulation regime range and phase angle difference constraints are analyzed. The principles for selecting DC offsets and constraint range of two-port modulation system in each operating mode are introduced. Finally, the different operating modes are verified using the DSP-FPGA-Typhoon HIL 402 experimental platform. The experimental results show that level-shifting pulse width modulation with DC offsets makes the output power quality of the converter better and the harmonic content lower on the premise of achieving stable output of voltage and current for the proposed converter topology.

The temperature changes of grain piles during rice storage in high-temperature and high-humidity grain storage areas were studied under the air-conditioning temperature control mode with a temperature of 22 ℃ and a daily opening time of 13 h and a temperature of 24 ℃ and a daily opening time of 24 h. The changes of rice moisture and fatty acid values ​​before and after temperature-controlled storage were compared, and the differences in temperature changes in each layer in the horizontal direction of grain piles at different depths were analyzed. The results showed that the average temperature and the maximum grain temperature of the grain pile increased slowly under different air-conditioning operation modes. Air-conditioned temperature-controlled grain storage had a greater impact on the surface temperature of the grain pile, but less impact on the middle layer grain temperature. During the air-conditioned temperature-controlled storage period, the lower layer grain temperature may be affected by the floor temperature. The temperature control mode that lowered the temperature control temperature but shortened the temperature control time was more economical and efficient. The temperature control mode of 22 ℃ + 13 h could save about 12.4% of electricity costs compared with the temperature control mode of 24 ℃ + 24 h. At the same time, the control effect of the warehouse temperature, surface grain temperature and average grain temperature of the grain pile with a lower basic grain temperature was more obvious, and the basic grain temperature of the grain pile played an important role in the implementation of temperature-controlled grain storage technology.

In order to solve the problem of response speed and improve the far-field divergence angle characteristics of the traditional Selective Area Growth-Duble Stack Active Laser-Electro-absorption Modulated Laser (SAG-DSAL-EML) in a high-frequency modulation environment, this paper uses the iron-doped buried technology to the Elector-absorption Modulated Laser (EML) structure was optimized, and the SAG-DSAL-EML with a 1 310 nm iron-doped buried structure of InGaAsP/InP material designed and a sample chip fabricated. The active area of the new SAG-DSAL-EML a mesa structure, and the two layers of the SAG-DSAL-EML epitaxially grown InP layer. At the same time, the laser part and modulator part of the designed iron-doped buried structure EML are numerically and simulated by Advanced Laser Diode Simulator (ALDS), and High Frequency Structure Simulator (HFSS). The results show that compared with the traditional multiple quantum well structure, the threshold current of the SAG-DSAL structure laser is reduced by 13% ompared with the traditional ridge waveguide structure, the lateral confinement capability of the iron-doped buried structure is improved by 52%. The difference is reduced by 40% and has a smaller far-field divergence angle ompared with the traditional PNPN buried structure, the response bandwidth of the modulator with the iron-doped buried structure at -3 dB is increased by about 24%. The sample chip is tested, and the test shows that the threshold current of the laser is 14.5 mA, the Side-Mode Suppression Ratio(SMSR) is 45.64 dB response bandwidth of the electro-absorption modulator -3 dB is 43 GHz under the injection current of 70 mA, which meets the basic requirements of high-speed laser communication.

In order to solve the problem of Catastrophic Optical Damage (COD) caused by the rapid rise of the cavity surface temperature during the long-term high temperature operation of the laser, it is proposed that the addition of Al2O3 coating and the thermal insulation structure together at the semi-conductor laser surface, it can reduce the temperature of laser cavity surface and prevent the generation of COD. First, a simplified semi-conductor laser model is established to analyze solid heat transfer. Then, the cavity surface temperature of the laser model is simulated at 550 K when there is no coating and no insulation structure, coating and no insulation structure, no coating and insulation structure, and when the coating and insulation structure act together, the ceramic heat insulation is used in the heat insulation structure, GaAs is used in the cavity surface material, Cu is used in the heat sink and AlGaAs is used in the contact layer. The results of 4 groups of contrast experiments show that the temperature of the cavity surface can be controlled below 393.15 K when the coating and the thermal insulation structure act together. 550 K high temperature in the laser cavity surface coating and thermal insulation structure under the dual protection, can effectively prevent the generation of COD, so that the life of the laser can be improved.

In order to improve the reliability of the front subframe of a front drive SUV, the strength and fatigue characteristics of the subframe under different working conditions are analyzed by comprehensively using the finite element method, multi-body dynamics theory, strength analysis theory and fatigue analysis theory, and through the established three-dimensional model of the front subframe and the rigid flexible coupling model of multi-body dynamics. The strength and fatigue tests of the subframe are carried out. The simulation results show that the deformation of steering connection point is 2.924 mm and 3.411 mm respectively under straight driving and steering conditions, and the deformation of stabilizer bar and torsion arm is 3.383 mm and 2.695 mm respectively. The strength test results show that, in the straight driving and steering conditions, the deformation of the steering point is 3.263 mm and 3.622 mm respectively, which are 11.59% and 6.19% higher than the simulation results. The deformation of the connection point of the stabilizer bar and the connection point of the torsion arm are 3.538 mm and 2.957 mm respectively. The experimental results are 4.58% and 9.72% higher than the simulation results respectively. The results show that there is no obvious difference between the experimental results and the simulation results, and the deformation of the subframe at each point conforms to the design. The fatigue test results of the subframe show that there are no cracks and plastic deformation in the subframe after 800 thousand torsion arm fatigue tests, 400 thousand braking force fatigue tests and 800 thousand lateral force fatigue tests, indicating that the fatigue characteristics of the subframe meet the requirements.

To meet the needs of intensive computing and low latency,mobile edge computing pushes the service resources of cloud computing to the edge,where is closer to the terminal.The ground network faces challenges in scenarios such as complex terrain and equipment failure.With the assistance of unmanned aerial vehicles,the flexibility and robustness of network deployment can be improved.Unmanned aerial vehicle has the advantages of low cost,convenient operation and flexible mobility.Due to the limitations of volume and weight,the power,communication and computing resources are often limited,the heterogeneity and dynamic characteristics gradually emerge in multi-unmanned aerial vehicle collaboration.Therefore,how to make efficient use of the resources become a research hotspot.From the perspective of overview,the problems and challenges faced in the promotion and application of UAV edge computing networks are combed,the current research status in power control,channel allocation,computing service resource management,and resource joint optimization are analyzed and summarized,the feasible optimization solutions of resource management are summarized and compared.Finally,the future development trend of resource management optimization is analyzed and prospected.

Mycobacterium tuberculosis(M.tuberculosis, Mtb)is the causative agent of tuberculosis and can survive through regulating intracellular phagocytosis and affect the biological function of host cells. Rab proteins are important components of intracellular membrane transport and involved in the phagocytosis of Mtb. This review summarized the effect of Mtb and its compositions on intracellular phagocytosis and the role of Rab in this process. Thus this review may provide some ideas to understand the relationship between Rab proteins and the phagocytosis of Mtb, and to provide new thoughts and potential targets based on exploring the intracellular immune mechanism of Mtb.

In this paper, the basic structure of sepiolite was briefly introduced and its application in the flame-retardant field of common polymer composites was systemically reviewed with 21 references. The modification of sepiolite and its synergistic effect with other flame-retardants in the polymer compo-sites were emphatically discussed, and its application was looked forward.

The power system promotes the construction of a strong smart grid and a ubiquitous power Internet of Things, making full use of modern information and communication technologies to support the evolution of traditional power grids to the energy Internet. In recent years, network slicing has received widespread attention from researchers, and it is not only a technology but also a new business model, which has attracted broad interest of researchers. Based on above background, in this paper, several typical user cases for smart grid are introduced firstly. In addition, we present the E2E business models and steps to implement network slicing for operators. Besides, the Total Cost of Ownership(TCO) and Return on Investment(ROI) of Network Slicing are also analyzed in Smart Grids for Operators.

The purpose of the experiment was to study the effect of grape seed proanthocyanidins on the growth performance, slaughter performance, meat quality and antioxidant performance of Hainan black goats. Forty healthy castrated male lambs of Hainan black goats were randomly divided into two groups with 20 replicates per group and one goat per replicate. The goats in the control group were fed a basic diet, while the goats in the experimental group were fed a basic diet added with 20 mg/kg BW grape seed proanthocyanidins. The pre-feeding period was 7 days, and the formal trial lasted for 90 days. The results showed that compared with the control group, the final body weight, average daily gain, meat weight, pH24 h value, cooked meat rate, muscle redness, serum T-AOC, T-SOD, GSH-Px and CAT activity of goats in the experimental group were significantly increased (P<0.05). The feed weight ratio, dripping loss, shear force and serum MDA content of the experimental group were significantly decreased (P<0.05). The content of muscle crude protein in the experimental group was significantly increased (P<0.01). The experiment indicates that the grape seed proanthocyanidins can effectively improve the growth performance, slaughtering performance and serum antioxidant performance of Hainan black goats, and can improve the meat quality. [ABSTRACT FROM AUTHOR]

The West Sichuan Plateau is one of the most concentrated areas for Kaschin Beck disease. Lack of selenium is an important factor of Kaschin Beck disease, therefore, selenium content study in this area is important for its prevention. Atomic Fluorescence Spectrometry was used to analyze the contents of selenium in water samples in the Aba region, West Sichuan Plateau. Results show that the content of selenium in water is low, and the content of selenium in groundwater is obviously higher than that of surface water and spring water. The content of selenium in spring water is 0.001-0.058 μg/L, with an average value of 0.0067 μg/L. The distribution of Se is controlled by geological background, pH and Eh. The low selenium geological environment is the most important factor leading to low selenium content in spring water. The selenium content of surface water is 0.001-0.148 μg/L, with an average value of 0.0221 μg/L, and the influence factors of selenium distribution are geological background, geographical conditions and water geochemical conditions. The content of selenium in groundwater is 0.001-0.210 μg/L, with an average value of 0.0523 μg/L, and the influence factors of selenium distribution are geological background, pH and Eh, as well as the content of organic matter. This study indicates that low selenium spring water cannot provide the selenium nutrition needed by Tibetans whose main drinking water source is spring water, and is thus not suitable as a water source. The surface water resources in the Western Sichuan Plateau are abundant. However, the migration of elements in water is very strong. Therefore, it is difficult for selenium in surface water to enter the ecological chain, making the surface water unsuitable as a source of drinking water. In order to reduce the incidence of local Kaschin Beck disease, groundwater with high selenium content should be used as a source of local drinking water.

Determination of heavy metals in atmospheric total suspended particulate matter(TSP) can provide the theoretical basis for the ecological risk assessment of heavy metals and environmental remediation work.The environmental effects of heavy metals in atmospheric TSP and surface soil(0-20 cm) were studied in an industrial city of southern China.TSP samples were collected by atmospheric active sampling technique.The content of heavy metals in TSP was determined by Atomic Fluorescence Spectrometry and Inductively Coupled Plasma-Mass Spectrometry.The characteristics and sources of heavy metals were analyzed by enrichment factor and Pearson coefficient method.The results show that the highest content of Zn, Pb and Cd in the study area is 30809.06×10-6, 9902.91×10-6, and 1011.21×10-6, respectively, which are 201.43, 222.53, 5616.20 times higher than the soil background values in China, and thus the pollution is serious.Cr and Ni contents were 1.83 and 2.96 times higher than the soil background values in China.Zn, Pb, Cd, Hg, As are enriched mainly from smelting, thermal power, and chemical plants as well as other artificial sources.The content of heavy metals in the soil of the study area shows a significantly positive correlation with the content of heavy metals in TSP, and thus the main source of heavy metals in the soil originates from atmospheric deposition.

The demographic dividend refers to the process of transforming population advantages into economic ones to achieve rapid growth. The opening and acquisition of a demographic window of opportunity requires corresponding institutional guarantees. Thanks to reform and opening-up, China has opened and reaped its first demographic window of opportunity. As China enters the critical stage of reform and upgrades for economic development, population advantages have been shifting from quantity to quality on a solid basis, marking the opening of our second demographic window of opportunity. Establishing and implementing compatible social and economic policies will be helpful to maximize advantages of this demographic “gift” and modernize China’s economic system

As(Ⅲ) is a highly toxic, mobile, and predominant arsenic species in anoxic groundwater.The removal of arsenic in contaminated water by using nanoscale iron particles has received extensive attention. The reduction potential and storage of Zn is lower and easier than that of Fe. Therefore, Zn is considered to be the best choice for the reduction of chlorinated organic compounds. To our knowledge, there is little research on the reduction of arsenic with nanoscale zinc in water. The objectives of this study were to investigate kinetics and impact factors by batch experiments. Pseudo-first-order, second-order kinetics and the intraparticle diffusion model were applied to simulate the sorption process. The sorption process was best fitted by the pseudo-second-order kinetic with reaction rate constants (k2) of 0.18 g/(mg·min). The adsorption capacity of nanoscale zinc for As(Ⅲ) was 0.47 mg/g. Chemical adsorption is the main mechanism of As(Ⅲ) removal by nanoscale zinc. The shaking time for optimum removal of As(Ⅲ) has been noted as 120 min for nanoscale zinc. The adsorbent dose for nanoscale zinc is 2.5 g/L. Maximum removal of As(Ⅲ) was observed in the pH range of 2-7. Over 99.5% As(Ⅲ) and As(Ⅴ) were removed within 120 min in an initial concentration of 0.565 g/L. These results suggest that nanoscale zinc particles can be used for treating As-affected groundwater that contains substantial As(Ⅲ) without preoxidation of As(Ⅲ) to As(Ⅴ). In comparison with traditional methods, the removal of As(Ⅲ) by nanoscale zinc is simple, inexpensive and has a high efficiency for application in water treatment facilities.

This research aims to solve the problems of information asymmetry, information fragmentation, lack of trust, and doubtful data authenticity and security in the current construction worker management process. A five-layer structural framework for information management of industrial workers in the construction industry is built with the advantages of blockchain technology, such as security and trustworthiness, hard tampering and traceability. In this way, an architectural reference for the integrated management of construction worker information in multiple stages is provided. The integrated information management path of construction workers' career in multiple stages is explored. Then, the blockchain-based construction workers' record authority management and transfer scheme is designed to improve the information integrity of construction workers, promote the value of their information, and help the development of informatization of the industrial worker teams in the construction industry. [ABSTRACT FROM AUTHOR]

Objective To investigate the effects of injury time, postmortem interval (PMI) and postmortem storage temperature on mRNA expression of glycoprotein non-metastatic melanoma protein B (Gpnmb), and to establish a linear regression model between Gpnmb mRNA expression and injury time, to provide aimed at providing potential indexes for injury time estimation. Methods Test group SD rats were anesthetized and subjected to blunt contusion and randomly divided into 0 h, 4 h, 8 h, 12 h, 16 h, 20 h and 24 h groups after injury, with 18 rats in each group. After cervical dislocation, 6 rats in each group were collected and stored at 0°, 16° and 26°, respectively. The muscle tissue samples of quadriceps femoris injury were collected at 0 h, 12 h and 24 h postmortem at the same temperature. The grouping method and treatment method of the rats in the validation group were the same as above. The expression of Gpnmb mRNA in rat skeletal muscle was detected by RT-qPCR. The Pearson correlation coefficient was used to evaluate the correlation between Gpnmb mRNA expression and injury time, PMI, and postmortem storage temperature. SPSS 25.0 software was used to construct a linear regression model, and the validation group data was used for the back-substitution test. Results The expression of Gpnmb mRNA continued to increase with the prolongation of injury time, and the expression level was highly correlated with injury time (P<0.05), but had little correlation with PMI and postmortem storage temperature (P>0.05). The linear regression equation between injury time (y) and Gpnmb mRNA relative expression (x) was y=0.611 x+4.489. The back-substitution test proved that the prediction of the model was accurate. Conclusion The expression of Gpnmb mRNA is almost not affected by the PMI and postmortem storage temperature, but is mainly related to the time of injury. Therefore, a linear regression model can be established to infer the time of injury. [ABSTRACT FROM AUTHOR]

[Objective] To put the theoretical basis on the biological control of actinomycetes to nematode, the effects of 3 actinomycetes on controlling root-knot nematode disease and growth promotion of cucumber were probed. [Method] The seeds of 9930 cultivar, which was susceptible to Meloidogyne incognita, was sown in the pots filled with the sterilized substrate, and the ones with 1.5 g/L Streptomyces pac-tum (Act12), Streptomyces albidoflavu (T4), Streptomyces rochei (D74), respectively. When the seedlings were at the stage of two fully expanded true leaves, 2 niL egg suspensions of Meloidogyne incognita containing 1 500 eggs mL-1 were inoculated in the substrates nearby the roots of seedlings, and these treatments were marked as Mi, Act12 + Mi, T4 + Mi, D74 + ML The galls number and gall index were surveyed at 30 d and 58 d after inoculation of root-knot netnatode, and the stem thickness, fresh weight of underground and aboveground and the total fresh weight of plant were measured; the size of giant cell was observed at 30 d after inoculation under a microscope by using hematoxylineosin staining to make paraffin sections of the galls. The comprehensive membership function was used to evaluate the effects of actinomy-cetes on controlling the disease of Meloidogyne incognita and the growth promotion of cucumber. [Result] 1) Compared with that of treatment Mi, the galls number on the seedling roots of treatment Act12 + Mi, T4 + Mi andD74 + Mi decreased significantly by 44.56%, 39.26% and 41.38%, respectively. The gall indexes of T4 + Mi and D74 + Mi also decreased significantly. For the adult plants, the gall number and the gall index were also significantly lower of the treatment T4 + Mi than that of Mi. The results of paraffin section showed that 3 actinomycetes significantly inhibited the expansion of giant cell in cucumber seedling roots comparing with that of Mi treatment. The inhibiting effects were T4, D74, and Actl2 in order. 2) Comparing with that of the control (CK) which was inoculated with neither actinomycete nor root-knot netna-tode, the underground fresh weight and aboveground fresh weight of the treatments inoculated with either T4 or D74 increased significantly, and the number of fibrous roots increased significantly. The underground fresh weight of treatment inoculated with Act12 also increased significantly. For the adult plants, the aboveground fresh weight, underground fresh weight and the total fresh weight of T4 + Mi significantly increased comparing with that of treatment Mi, and the underground fresh weight of Act12 + Mi and D74 + Mi also increased significantly. In summary, pre-inoculation of T4 promoted the cucumber plants to grow well. 3) It showed that the values of T4 was the largest, and the next was D74, and then the Act12. [Conclusion] All 3 actinomycetes had a significant effect on the growth promotion and the disease controlling of root-knot nematode. Pre-inoculating of Streptomyces albidoflavus (T4) was the best. [ABSTRACT FROM AUTHOR]

The experiment was to explore the application effect of fermented apple residue feed in the feeding of pregnant sows. 32 pregnant sows were randomly divided into four groups, with eight replicates in each group and one sow in each replicate. The sows in control group were fed with a basal diet, and the sows in experimental group I, group II and group III were fed with diets supplemented with 5%, 10% and 15% fermented apple residue, respectively. The results showed that the backfat thickness of sows in test group II and group III was significantly higher than that in control group (P<0.05), and the backfat thickness of sows in test group II increased the most. The average weight of weaned piglets in test group I was extremely higher than that in control group (P<0.01). Serum total protein content of sows in test group II was extremely higher than that in control group (P<0.01), and serum glutamic-pyruvic transaminase activity of sows in test group III was significantly lower than that in control group (P<0.05). From 75 to 90 d of gestation, the progesterone concentration of sows in test groups was significantly higher than that in control group (P<0.05). The experiment indicates that the addition of 10% fermented apple residue feed to basic diet can promote the growth and development of pregnant sows and improve the production performance of pregnant sows. [ABSTRACT FROM AUTHOR]

In the C02 reforming process of tar,iron doping is used to increase the coke resistance of single metal nickel-based catalysts. The catalytic activity and coking resistance of NiZZr02 and bimetal Ni-Fe/ Zr02 catalysts in the carbon dioxide reforming of toluene were studied. The result showed that the interaction between nickel and iron in Ni-Fe alloy is caused by the promotion of reforming reaction after adding iron. Meanwhile, coke deposition on the surface of nickel catalyst was also inhibited after Fe doping, resulting in coke deposition on Ni-Fe/Zr02 (5. 48% ) lower than that on NiZr02 (27. 54% ). By adding iron to nickel catalyst during C02 reforming of tar,coke resistance and stability can be improved,which makes the catalyst suitable for tar removal process. [ABSTRACT FROM AUTHOR]

The application of renewable visible light in organic synthesis has attracted considerable attention of organic chemists. As an organic compound containing unsaturated carbon-carbon triple bonds,alkynes play an important role in chemical synthesis. Fluorinated compounds have been widely favored by organic chemists for their unique reactivity and position in drug molecules.However,most of the developed methods for introducing fluor-compounds have been suffered from harsh conditions. It is a worthy subject how to use photosensitizers to absorb low-energy light in the visible light spectrum to generate active intermediates, through an electron transfer process to trigger fluorination reagents to generate free radicals to fluorinate alkyne organic compounds under mild conditions.In this review, we summarize the research results of visible light-catalyzed fluorinated bifunctional alkynes in recent years based on different fluorinated reagents. [ABSTRACT FROM AUTHOR]

Objective To observe the effect of Osteoking on blood biochemicalindicator of tree shrews with osteoporotic fracture （OPF） ．Methods Totally 30 female tree shrews （Tupaiabelangeri） were randomly divided into the treatment group， the model group， and the control group， with 10 in each group. Bilateral ovaries and uterus were ectomized for 6 months in the treatment group and the model group， and right fibula fractures were induced after confirmed osteoporosis. Tree shrews in the treatment group were administered with Osteoking by gastrogavage， once per two days. Equal volume of normal saline was given to tree shrews in the model group and control group. Blood biochemical indexes were detected at 3 months after fracture．Results Compared with those in the control group， serum creatine kinase isoenzyme （CK-MB）， alanine aminotransferase （ALT）， magnesium （Mg2 ）+ levels significantly increased （P＜0.01） while total cholesterol （CHOL） and blood glucose （Glu） levels were significantly decreased （P＜0.01） in the OPF model group. Compared with those in the model group， serum CK-MB and ALT significantly decreased （P＜0.01） and Mg2+ significantly decreased（P＜0.05 while CHOL and Glu significantly increased （P＜0.05） in the treatment group. Conclusion Osteoking can protect the heart and liver function of tree shrew with osteoporotic fracture. [ABSTRACT FROM AUTHOR]

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Combined with the actual operation of the open laboratory construction, the paper dealt with the roles of school, school experiment center, the secondary colleges and its use of various laboratories in the application of operation and management of Open Laboratory. From student-oriented viewpoint and based on the conception of top-level design, the paper referred to the domestic research and practice achievements of colleges and universities, elaborated the basic connotation of opening laboratory mode, and explored model for open laboratory in accordance with the scientific theory, method and steps through multi-angle comprehensive analysis, description and design. The idea gradually realized the stage goal, long-term planning, and took the whole situation into account. The plan should accordi with integrated resource, and improve the management of the open laboratory and open system, and establish operation mechanism effectively. The purpose of the paper is to serve to teachers and students in some ways and methods. [ABSTRACT FROM AUTHOR]

Focusing on packet marking traceback technology in DDoS attack defense, a novel approach is proposed to represent three elementary defending implementations namely attack tree construction, attack path frequency detection and packet to path association as succinct recurrence relations based on divide-and-conquer strategy, which uses single packet in-band path identifiers for unique packet to path association while handles attack tree construction and attack path frequency detection as independent out-of-band processes. By testing and evaluating the network traffic and storage overhead on real-life Internet, the results show that this method realistically achieves single packet traceback guarantees with minimal overhead for a large number of victims under heavy traffic loads simultaneously. [ABSTRACT FROM AUTHOR]

By using sediment trap and suction pump to measure the relative sediment levels across different sites and water depths, and through the in situ measurements of Sargassum horneri density, this paper assessed the relationships between the distribution of S. horneri and the sediment levels and wave exposure on the rocky subtidal platforms around Gouqi Island, China. The laboratory-based experiments were also conducted to test the effects of different sediment levels on the attachment of S. horneri zygote and the survival rate of S. horneri germling after the attachment. S. horneri predominated at the sites with lesser sediment and wave exposure, but less distributed in the sites with high level sediment and wave-exposure. At different water depths, the distribution of S. horneri was negatively correlated with the amount of sediment. A medium dusting (dry mass 10. 47 mg.cm-2, approximate 0. 543 mm deep) of sediment on the plate reduced the percentage of S. horneri zygotes attached to the substratum by 4.4%, and a heavy dusting ( dry mass 13. 96 mg.cm-2, approximate 0. 724 mm deep) of sediment on the plate completely prevented the attachment. One week after the settlement of the zygotes, there were 24% of the germlings still survived when the dry mass sediment coverage was 13. 96 mg.cm-2. However, when the dry mass sediment coverage was up to 34. 9 mg.cm-2 (approximate 1. 81 mm deep), 100% of the germlings died. Overall, the distribution of S. horneri was not only related to sediment level, but also restricted by wave exposure to some extent. Sediment level was a critical factor affecting the distribution of S. horneri, particularly at its zygote attachment stage. [ABSTRACT FROM AUTHOR]

This article describes the effect of hem structure on sweater style and the relationship between the hem types with other parts of sweater. The design and process of several fashion sweaters with different type of hem were analyzed. Design style and style characteristics of each sweater were described. Structures design and knitting pattern notations and operation process of each sweater was given. The results showed that, sweater with changes in hem have innovative and unique style. With the increase of design method and knitting technique for sweater, types of hem for sweater are also growing. [ABSTRACT FROM AUTHOR]

A method of simultaneous magnetometer calibration and measurement error compensation of geomagnetic field was proposed. A parameterized model comprising sensor calibrating error and measurement error of geomagnetic field was constructed by an error analysis through the measurement. Those parameters in the model were estimated using total least squares (TLS) based algorithm, according to the spread of measurement noise. Compared with the traditional least squares (LS) based algorithm, both simulated results and experimental results show that the TLS based algorithm achieved higher estimated precision and better compensation. [ABSTRACT FROM AUTHOR]

This article described the design method and process of several wool knitted fashion accessories, such as hat, scarf, shawls and gloves, which were produced on the computerized flat knitting machine. Style and form of these accessories were analyzed. Programming, knitting and finishing technologies of these accessories were also described. Programming process of each accessory was given. The results showed that, the design of knitting structures for wool knitted fashion accessories were important as well as the designs of style and color. Different knitting structures gave the knitting accessories different effects of structure and color, so as to enrich their effect of appearance. With the increasing popularity of computerized flat knitting machine, space of design and production for the wool knitted fashion accessories was also growing. [ABSTRACT FROM AUTHOR]

In this article, in the light of documents consultation and experts interview, focuses was placed on the investment and financing for the venue and host city for Olympic games. It is found that there is a tendency of diversification in invest-ment and financing for the Olympic venue and variation in mode and the sources of funding. Moreover, with the number of investors growing, the mixed investment and financing mode become the mainstream type of investment. In addition, there are some factors which influence on the hosts' choices of the investment and financing mode. They are the strategies of the host countries, the development of capital market and the function settlement of the venue. The investment and financing mode have great effects on the operation after the completion. Some advices are thus given as follow. It should reform the in-vestment and financing system of venue followed by the introduction of the market mechanism which facilitates the full use of the current venues. It is of importance to strictly control the number of new venue and inputs attract investment from the pri-vate sector participation in sports venue. There is a need to facilitate the stadium after the game operation. At last, it is an imperative to fully consider the operation after the game, scientifically design the channels of the return of the investment etc. [ABSTRACT FROM AUTHOR]

This article described the design method and process of several dress sweaters, which were produced on the common flat knitting machine. Design idea and style of the dress sweater were analyzed. Organization design and knitting pattern notations of each dress sweater were described. Operation process of each sweater was given. The results showed that, using the common flat knitting machine, the dress sweater can also be designed and produced, which can better reflect the curves taken by the body. The dress sweater with changes in knitted patterns had innovative and unique style, taking the beautiful, stylish, could follow the development trend of fashion and variety the market needs of sweater. With the increasing popularity of computerized flat knitting machine, space of design and production for the dress sweater was also growing. [ABSTRACT FROM AUTHOR]

The freely rising rule and Magnus force of different wooden balls rising in the static liquid were investigated using computer image processing technology and visual experiments. The results show that both the vertical and horizontal velocities of different wooden balls reach stable maximums in a short time after the wooden balls begin to rise, then the wooden balls keep rising with this maximum. The value of Magnus force is calculated by measuring the vertical and horizontal and spinning angle velocities of the wooden balls at the stable stage. [ABSTRACT FROM AUTHOR]

This article describes the design and technology of several sweaters, which knitted by local knitting technology on the computerized flat knitting machine. Style and form of the sweater were analyzed. Structures design and knitting pattern notations process of each sweater were described. Operation process of each sweater was given. The results showed that, sweaters having appearance of lotus leaf, fan-shaped, round ring or fold-like effects can be easy formed using local knitting technology. Compared with the sweaters on the normal resting flat knitting machine, the sweaters had high efficiency, a rich form and significant three-dimensional effects. These made the sweater style was more innovative and unique ability to meet the current sweater of fashion, modeling a variety of needs. So, the local knitting technology was suitable for spreading used in design of the sweater. [ABSTRACT FROM AUTHOR]