Eight aquatic plant species commonly found in northern China were studied on their removal ability and enrichment ability of nitrogen and phosphor in root, stems and leaf through the pot experiments. The result shows that when the concentration of TP and TN in entering water is ranged from 0.29 to 0.46mg/L and 4.69 to 4.74mg/L respectively,Lythrumsalicaria,IrispseudacorusandTyphaangustifoliahave the higher removal rate of TP, which increased by 18.61%, 17.8% and 16.44%, respectively, compared with the blank;Typha orientalis Presl,Phragmitesaustralisand T.angustifoliahave the higher removal rate of TN, which increased by 21.10%, 21.81%, 21.64%, respectively, compared with the blank.L.salicariahas the best removal ability of TP, the removal rate of TP in root,stem and leaf arrived at 3.57%, 2.13% and 3.34% compared with control.T.orientalis Preslhas the best removal ability of TN. Among the test plant species,L.salicaria, T.orientalis Presl andT.angustifoliaare the best one for the water purification in Ashi River basin.
The continuum manipulators, which have gradually become a research hotspot of minimally invasive surgery have the characteristics of small size, lightweight, and better environmental adaptability. In this paper, a two degrees of freedom continuum manipulator with notches is proposed. The kinematic and mechanical models of the notch continuum manipulator are coupled. The output driving force of the motor is needed to control the manipulator. Due to the drift of the current of the motor, the accuracy of the control is low. In order to solve the above problem, the constant curvature assumption is realized by changing the structural parameters of the notches. The continuum manipulator mechanics model is established through the analysis of the continuum manipulator structure. The calculation of the deformation angle of a single notch of the manipulator is carried out. The overall deformation of the manipulator is derived through iterative algorithms. The stiffness of the continuum manipulator, which can affect the deformation of the continuum manipulator is modified by changing the structural parameters. In this way, the problem of the non-constant curvature deformation under the uniform notch of the continuum manipulator is improved. And the effectiveness of the variable stiffness model is verified by simulation experiments.
In order to obtain high-quality analytical results of the finite element model, it is essential to construct a three dimensional geometric model. The paper reconstructed an accurate three dimensional geometric model of cervical spine segments (C4-C7). The process of reconstruction included three-dimensional reconstruction, smooth processing, contour generation, grid generation and fitting surface. Moreover, the result of reconstruction was evaluated ultimately. The model was validated to be smooth and reasonable, and could meet the requirements of finite element analysis. The method is not merely applied to reconstruct the geometric model of the cervical spine. It is a way to construct the model of the skeletal system of the human body.
The utilization of bioaugmentation in constructed wetland can enhance the effect of organic matter removal from wastewater. Obtaining effective COD degrading bacteria plays a key role in bioaugmentation. In this paper, in order to improve the capacity of organic matter removal of constructed wetland, four kinds of effective COD degrading sprains (A2,A11,B1,C4) were obtained from soil of constructed wetland by the way of segregation, primary screening and secondary screening. Through the test of microorganism construction to acquire matching groups with better growth situation and the test of technical conditions optimization inspecting the influence of PH, temperature and rotate speed of incubator shaker on COD converting rates, group A2A11,A11B1,A11C4 and B1C4 were acquired, among which the group B1C4 had the highest COD converting rates (73.74%) when PH was 6.8, temperature was 20 and rotate speed was 100r/min. Using the method of 16S rDNA sequence determination, we observed that sprain B1 had the most similarity with Bacillus simplex (T); DSM1321T; AJ439078, 99%, belonging to bacillus, and sprain C4 had the most similarity with Pseudomonas stutzeri (T); ATCC 17588; AF094748, 97%, belonging to Pseudomonas.
In the virtual scene of robot assisted virtual surgery simulation system, the surgical instruments achieve complex motion following the haptic devices and the soft tissue deforms continuously under interaction forces. In order to meet the rapidity of collision detection, an algorithm based on changeable direction hull bounding volume hierarchy is proposed. Strategy of combining surface model with body model is developed for soft tissue deformation. Skeleton sphere model of soft tissue is built. Deformation can be achieved based on mass-spring theory after matching collision information with the skeleton sphere model. The experiments show that the proposed collision detection method implements faster speed compared with fixed direction hull algorithm and soft tissue deforms through combination of collision information with sphere model.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.