Data sampling and processing for contact free-form surface scan-tracking measurement

To overcome the shortcomings of the traditional free-form surface tracking measurement data sampling methods, a new data accept and reject method which combines isochronous indistinctive sampling with off-line equal-error accurate arithmetic is designed. Dual-thread and dual-buffer dynamic storage technique is adopted to solve the problem of mass data information storage, and data acquisition processing is divided into two links: data sampling thread and data storage thread, each link being achieved by an individual thread and can concurrently assess data buffer without overlapping. SQLite3 is chosen to realize data storage, and the storage speed is tested by experiments. To reflect the geometric characteristic of the model surface figure accurately and make the measured data close to the real model curve more, the circle ratio method is utilized to achieve the curve smoothing treatment. The designed data sampling method enhances the sampling precision and sampling efficiency. Finally, a bicycle saddle model intersection’s self-learning control process is simulated with Matlab. Simulation results demonstrate the workability and the effectiveness of the proposed method.     

磷光WOLED——光明之路

平板电视屏幕尺寸不断地增长,它的照明功耗也在不断增加。而发白光的有机电致发光器件可以实现平板电视低功耗全彩色光源的要求,并且还可以应用于其他固态照明设施。     

One-step synthesis of highly biocompatible multi-shaped gold nanostructures with fruit extract

In this study, the authors demonstrate the synthesis of various gold nanostructures through a one-step, green and complete bio-modulation approach. Nanoparticles were successfully synthesised by the addition of gold aqueous solution to fruit extracts, including orange, papaya, peach or lemon. The particles were of various shapes and sizes with high abundance, such as sphere, marigold, triangle and hexagon. The biocompatibility of the presented gold nanostructures was examined; haemolysis tests revealed a non-toxicity result in blood cell uptake of such gold nanostructures. This study opens the exciting possibility of synthesising various multi-shaped nanoparticles through a simple and green approach, as well as paving the way for future bio-applications.     

Physical and Sensory Properties of Model Foods Supplemented with Cauliflower Fiber

Cauliflower floret/curd and stem, as by-products of processing, are a source of pectic-polysaccharide-rich fiber concentrates for use as water and oil binding agents and textural agents to improve the properties of model foods. Dehydration resulted in a 10% decrease in methyl esterification at above 40°C. Water retention capacity of florets (40°C) was reduced from 12.8 g/g to 5.7 g/g in 75°C dried samples, demonstrating the importance of matrix structure rather than polysaccharide composition for functional properties. Incorporation gave a 10% increase in the yield of beefburgers and a partial substitution for purified gums in sauces. Cauliflower fibers can be incorporated into food systems at concentrations found in vegetables but sensory characteristics depend on processing history.     

Thermal resistance of Salmonella serovars isolated from raw, frozen chicken nuggets/strips, nugget meat and pelleted broiler feed

Raw, frozen chicken nuggets/strips available at retail and prepared at home before consumption have been identified as a significant risk factor in contracting food-borne salmonellosis. Cases of salmonellosis from consumption of these products may be due, in part, to Salmonella strains originating in broiler feed. In this study the thermal resistances of Salmonella strains isolated from chicken nuggets and strips, chicken nugget/strip meat and broiler feed were determined to assess whether they exhibited enhanced thermal resistance. Thermal resistances (D- and z- values) of 7 cocktails (25 isolates, 4 serovars) were determined in commercially prepared irradiation-treated chicken nugget/strip meat blend, and heated in a constant temperature waterbath. The thermal resistances found were lower than those reported for similar strains in the literature. D-values ranged from 6.93 to 0.12 min at 55 and 62 degrees C respectively, with z-values from 4.10 to 5.17 degrees C. Two strains of S. Enteritidis separately isolated from pelleted feed and chicken nugget meat blend, with indistinguishable geno- and phenotypes, had lower (and probably identical) thermal resistances than the other isolates. Results indicated that the strains of Salmonella isolated from raw, frozen chicken nuggets/strips and pelleted broiler feed did not exhibit unusually high thermal resistance, and that normal heating (71 degrees C) prior to consumption should eliminate these organisms from chicken nuggets/strips.     

Etude des conditions de formation par voie hydrothermale des borates de terres rares TBO3 pseudo-vaterite

The pseudo-vaterite structure of the rare-earths-metals (Lu to Sm) is unique with no analogy among nitrates and carbonates. A careful study by hydrothermal synthesis of the conditions of formation of these compounds gives useful informations on the crystallographic structure and allows to synthetize three new pseudo-vaterite compounds, NdBO₃, PrBO₃, CeBO₃.     

Trajectory planning and control of a Stewart platform-based end-effector with passive compliance for part assembly

This paper presents the kinematic analysis and trajectory planning for a six-degrees-of-freedom end-effector whose design is based on the Stewart platform mechanism. The end-effector is composed of two platforms and six linear actuators driven by stepper motors. A spring-loaded platform is used to provide passive compliance to the end-effector during a part assembly. A closed-form solution is derived for the inverse kinematic transformation and a computationally effective numerical solution is obtained for the forward kinematic transformation using the Newton-Raphson method. Three trajectory planning schemes, two for fine motion and one for gross motion are developed. Experimental results of tracking various test paths are presented.     

On the reliability of scrape-off layer ion temperature measurements by retarding field analyzers

The retarding field analyzer (RFA) is one of the only widely accepted diagnostics for measurements of ion temperature Ti in the tokamak scrape-off layer. In this paper we analyze some instrumental effects of the RFA and their influence on Ti measurements. It is shown that selective ion transmission through the RFA slit is responsible for an overestimation of Ti by less than 14%, even for a relatively thick slit plate. Therefore, thicker slit plates are preferable, since they reduce, e.g., the risk of melting during off-normal events, and the effect of positive space charge inside the cavity. The influence of the electron repelling grid, as well as misalignment of the slit with respect to the magnetic field on Ti measurements are negligible.     

Biological nutrient removal in simple dual sludge system with an UMBR (upflow multi-layer bioreactor) and aerobic biofilm reactor.

In this study, a simple dual sludge process was developed for small sewage treatment. It is a hybrid system that consists of upflow multi-layer bioreactor (UMBR) as anaerobic and anoxic reactor with suspended growth microorganisms and post aerobic biofilm reactor with inclined plates. UMBR is a multifunction reactor that acts as primary sedimentation tank, anaerobic reactor, anoxic reactor, and thickener. The sludge blanket in the UMBR is maintained at a constant level by automatic control so that clear water (30 mg-SS/L) can flow into the post aerobic biofilm reactor. It leads to improving performance of the biofilm reactor due to preventing of excess microbial attachment on the media surface and no requirment for a large clarifier caused by low solid loading. The HRT in the UMBR and the aerobic biofilm reactor were about 5.8 h and 6.4 h, respectively. The temperature in the reactor during this study varied from 12.5 degrees C to 28.3 degrees C. The results obtained from this study show that effluent concentrations of TCOD, TBOD, SS, TN, and TP were 29.7 mg/L, 6.0 mg/L, 10.3 mg/L, 12.0 mg/L, and 1.8 mg/L, which corresponded to a removal efficiency of 92.7%, 96.4%, 96.4%, 74.9%, and 76.5%, respectively. The sludge biomass index (SBI) of the excess sludge in the UMBR was about 0.55, which means that the sludge in the UMBR was sufficiently stabilized and may not require further treatment prior to disposal.