Biochemical mechanism of rice nitrogen promoting the resistance development of Nilaparvata lugens (Stål) to buprofezin

Lu Wencai,Liao Dunxiu,Wei Peng,Ma Lianjie,Zhang Hui,Niu Ying 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.3

Overusing nitrogen fertilizer not only pollute farmlands, but also make Nilaparvata lugens (Stål) less susceptible to pesticides. The current study investigated the relationship between nitrogen fertilizer application and bupro fenzin resistance in N. lugens in rice by conducting a series of field efficacy tests and laboratory bioassays. The results showed that the efficacy of buprofezin decreased significantly with high level of nitrogen fertilizer application, compared to those with low or no nitrogen application in rice fields. In the laboratory, the resistance ratios of N. lugens to buprofezin, assayed at three concentrations of nitrogen (0, 1.0, 3.0 mmol/L), have devel oped to 14.05-, 18.40- and 25.81-fold after 20 generations of resistance selection, respectively. Meanwhile, the resistance ratios of N. lugens without buprofezin treated were 1.00-, 3.30- and 4.67-fold after 20 generations as the nitrogen concentrations increased. The enzymatic assays revealed that the activities of P450 and esterase increased significantly after resistance selection with buprofezin and nitrogen, especially on the esterase activity in N. lugens under the condition of nitrogen treatment. These results suggested that nitrogen fertilizer application contributed to the resistance development in N. lugens to buprofezin by enhancing the activity of esterase.

太史令與十六國政治

李文才(LI-Wencai) 영남대학교 인문과학연구소 2007 人文硏究 Vol.- No.52

태사령은 16국의 정권에서 숭고한 정치적 지위를 누리면서 16국의 정치 활동에전면적으로 관여할 수 있었다. 어떤 특정한 경우에 태사령은 심지어 전면적인 정책 결정의 방향을 좌우할수 있었다. 태사령이 정치에 관여하는 길은 두 가지가 있다. 하나는천문 현상의 변화재해와 길상의 조짐을 기록하고 해석하여 직접적으로 군주에게 정책적 자문을 제공하거나정책 결정에 참여 하는 것이다. 다른 하나는 그들이 맡아서 기록하여 온 천문 현상의 변화재해 와길상의 상황이 다른 대신들에 의해 군주에게 간언하는 근거로 쓰였거나, 혹은 군주의 정치 판단에 직접적으로영향을 주었으니, 이 때문에 천문 현상의 변화재해와 길상이 정치에 대해 지닌 영향력은 현실 정치에대한 태사령의 간접적인 관여로 볼 수 있다. 태사령은 16국의정권에서 숭고한 정치적 지위를 가질 수 있었으니, 선진시대 사관의 숭고한 정치적 지위는 위진남북조 시기의반사광일 뿐만 아니라, 16국 통치자들의 문화 심리 상태에 의해 결정된 것이다. 이러한 의미에서 말하자면, 역사와 현실이라는 이중 요소가 16국 정권에서의 태사령의 숭고한 지위를 만들었다고 할 것이다. TaiShiling(太史令) had the power to intervene the politics of the Sixteen-Kingdoms inevery aspect, so we can hold such a viewpoint as TaiShiling(太史令) possessing a very important status in the political circles of theSixteen-Kingdoms. In some times TaiShiling (太史令)could make a firm decision in the policy makings. There were two channels for TaiShiling(太史令) to intervene the politics such as providing the policy consult byway of recording and explaining the phenomenon of the astronomy for the Emperiesor by way of providing the recorders to the other officials who making theserecorders as the grounds to advise the Emperies. It was the reasons of thehistory and reality that made TaiShiling(太史令)take a very important standing in the politics of the Sixteen- Kingdoms.

Reactivity of carbonized fungi supported nanoscale zero-valent iron toward U(VI) influenced by naturally occurring ions

Congcong Ding,Wencai Cheng,Xiaoqin Nie,Facheng Yi,Shuhong Xiang,Abdullah M. Asiri,Hadi M. Marwani 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-

More discrete and active nano-scale zero-valent iron (NZVI) particles were obtained by assembling them on the surface of carbonized fungi (F) in this study. NZVI/F composites can totally remove 0.25 mmol/L U(VI) in 0.5 h at pH 6.5. Both sorption and reductive precipitation of U(VI) resulted in the high removal. Preliminary evidence showed that the influence of ions (Na+, K+, Ca2+, Mg2+, and CO32−) on NZVI/F composites reactivity varied with system pH. Our findings could provide an essential start in the treatment of water containing U(VI) and multiply coexistent ions, and open the doorways for the application of NZVI/F composites.

An Optimization Model on Virtual Machines Allocation Based on Radial Basis Function Neural Networks

Wei Wu,Wencai Du,Hui Zhou,Jiezhuo Zhong,Zhen Guo 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.6

Properly allocation of virtual machines is important for computing infrastructures scheduling. This paper presents systemic method on virtual machine array optimization control based on artificial intelligence and matrix control theory. According to request service data from users to provide proper VMs roughly via intelligent pattern recognition based on RBFNN, the data is sent to a multiple-targets optimization process to produce VMs allocation matrix precisely, thus enable to minimize the cast and enhance efficiency of the whole array to achieve low consumption optimization and ensure the stability of the system. Simulation experiments confirmed the effectiveness of this model and adaption ability in online dynamics.

Compressed Sensing Based Channel Estimation for OFDM Transmission under 3GPP Channels

Han Wang,Wencai Du,Yong Bai 보안공학연구지원센터 2016 International Journal of Future Generation Communi Vol.9 No.4

A large number of pilots are utilized to acquire channel information in traditional channel estimation for Orthogonal Frequency Division Multiplexing (OFDM) system, which leads to lower spectrum efficiency. For exploiting the sparse channel characteristics of 3GPP multipath channels, we employ the Compressed Sensing (CS) approach for channel estimation. Two CS-based recovery algorithms, Orthogonal matching pursuit (OMP) algorithm and Compressive sampling matching pursuit (CoSaMP) algorithm, are considered in this paper. The Bit error rate (BER) and Mean squared error (MSE) performance using traditional least square(LS), and two CS-based algorithms are given. Simulation results demonstrate that the CoSaMP algorithm achieves best performance with fewer pilots among three algorithms under 3GPP channels.

Molten Salt Synthesis of Strontium-Doped Lanthanum Manganite Nanoparticles with Enhanced Catalytic Performance for Toluene Combustion

Yingliang Tian,Wencai Liu,Yongqiang Lu,Shibing Sun 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.5

La1-xSrxMnO3-α(LSMO) and LaMnO3+α(LMO) nanoparticle catalysts have been synthesized via a one-step molten salt route. It was found that the partial substitution of lanthanum by strontium had a promoting effect on the catalytic performance for toluene oxidation. Under the condition of toluene concentration=1000 ppm, toluene/O2 molar ratio=1/200 and the space velocity=20000 mL/(g h), the temperature required for 50% and 90% toluene combustion conversion was 150℃ and 205℃ over LSMO catalyst, respectively. It is concluded that the oxygen vacancy, the molar ratio Mn4+/Mn3+ on the surface and the specific surface area contribute to the improved catalytic performance of the LSMO nanoparticle materials via a one-step molten salt method.

Novel Preamble Design for Channel Estimation in FBMC/OQAM Systems

( Han Wang ),( Wencai Du ),( Lingwei Xu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.8

The nonorthogonality between the real and imaginary FBMC/OQAM modulated signals complicates the channel estimation (CE) process, and conventional OFDM CE methods cannot be directly applied to FBMC/OQAM. The conventional preamble-based CE schemes in FBMC/OQAM systems are mainly based on the interference approximation method (IAM) to improve the estimation performance. In this paper, we develop a novel preamble structure to improve the CE performance. We exploit the symmetry pattern to cancel interference and take into account the interference weights in this symmetric structure. The conventional preamble and the proposed preamble are compared via simulations in the IEEE 802.22, 3GPP Vehicular A and Pedestrian A channels. Numerical simulation results demonstrate that the proposed preamble can achieve better bit error ratio (BER) and mean squared error (MSE) performance under the three channel models considered.

Non-interfacial self-assembly of synthetic protocells

Xiaolin Xu,Wencai Guan,Xiaolei Yu,Guoxiong Xu,Chenglong Wang 한국생체재료학회 2023 생체재료학회지 Vol.27 No.00

Background Protocell refers to the basic unit of life and synthetic molecular assembly with cell structure and function. The protocells have great applications in the field of biomedical technology. Simulating the morphology and function of cells is the key to the preparation of protocells. However, some organic solvents used in the preparation process of protocells would damage the function of the bioactive substance. Perfluorocarbon, which has no toxic effect on bioactive substances, is an ideal solvent for protocell preparation. However, perfluorocarbon cannot be emulsified with water because of its inertia. Methods Spheroids can be formed in nature even without emulsification, since liquid can reshape the morphology of the solid phase through the scouring action, even if there is no stable interface between the two phases. Inspired by the formation of natural spheroids such as pebbles, we developed non-interfacial self-assembly (NISA) of microdroplets as a step toward synthetic protocells, in which the inert perfluorocarbon was utilized to reshape the hydrogel through the scouring action. Results The synthetic protocells were successfully obtained by using NISA-based protocell techniques, with the morphology very similar to native cells. Then we simulated the cell transcription process in the synthetic protocell and used the protocell as an mRNA carrier to transfect 293T cells. The results showed that protocells delivered mRNAs, and successfully expressed proteins in 293T cells. Further, we used the NISA method to fabricate an artificial cell by extracting and reassembling the membrane, proteins, and genomes of ovarian cancer cells. The results showed that the recombination of tumor cells was successfully achieved with similar morphology as tumor cells. In addition, the synthetic protocell prepared by the NISA method was used to reverse cancer chemoresistance by restoring cellular calcium homeostasis, which verified the application value of the synthetic protocell as a drug carrier. Conclusion This synthetic protocell fabricated by the NISA method simulates the occurrence and development process of primitive life, which has great potential application value in mRNA vaccine, cancer immunotherapy, and drug delivery.

Fiber Ring Laser Intra-cavity Absorption Spectroscopy for Gas Sensing: Analysis and Experiment

Mo Li,Kun Liu,Wencai Jing,Gang-Ding Peng 한국광학회 2010 Current Optics and Photonics Vol.14 No.1

Fiber ring laser based intra-cavity absorption spectroscopic sensor has great potential for high sensitivity gas detection. Using the rate equations and propagation equations, we investigated theoretically factors that affect the sensitivity of such fiber ring laser sensors and determined the optimal design parameters and conditions for significant enhancement of the system sensitivity. Experiments have been conducted to determine the sensitivity enhancement performance. The results showed a factor of 25 ~ 30 in sensitivity enhancement in the experimental system, agreeing well with the theoretical expectations. Experiments on acetylene detection have also been carried out and the results showed that the ring cavity significantly increases the signal absorption and that high sensitivity can be obtained for gas detection.

Geometric optimization and performance analysis of radial MR valve using Taguchi orthogonal experiment method

Guoliang Hu,Feng Zhou,Wencai Zhu,Lifan Yu,Gang Li 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.9

Aiming at the problems of increasing external dimensions and deteriorating key performance indicators in the design process of magnetorheological (MR) valve by using structural optimization method, a geometric optimization design methodology for the optimal design of a MR valve structure under specific volume constraints is proposed in this article. The optimization methodology couples the finite element model (FEM) constructed in COMSOL software with the Taguchi orthogonal experiment and response surface technology to build an approximate response surface function for the identified independent variables. Suitable optimization algorithms are then utilized to determine the optimal geometry of the MR valve, thereby maximizing the valve performance. Firstly, a radial MR valve with a single excitation coil was presented, and its structure and working principle were also elaborated. A mathematical model of the pressure drop was derived on the basis of the Bingham-Papanastasiou non-Newtonian constitutive model of MR fluid and the magnetic circuit had been analyzed with the FE analysis methodology. Then, a second-order response surface model (RSM) had been fitted for the magnetic flux density in the radial flow channel and spool region of the radial MR valve based on the Taguchi orthogonal experimental design. The fitted model was a function of the four independent variables of the radial MR valve, and the accuracy of the developed response surface function over the entire design space had also been estimated. Meanwhile, predictions made by the RSM and FE models were evaluated by analysis of variance and it was exhibited that the RSM model’s results agree with FE result fairly. Subsequently, the geometric optimization problem had been formulated for the constructed RSM exploiting the genetic algorithm to find the global optimum geometrical parameters of the radial MR valve. Furthermore, the experimental test rig was setup to explore the pressure drop and the response time characteristics of the initial and optimal radial MR valve as well as the dynamic performance of the MR valve controlled cylinder system under different excitation conditions. The experimental results show that under the applied current of 2 A, the pressure drop and adjustable coefficient of the optimal radial MR valve observably increased with values of 3.15 MPa and 5.40, respectively, when compared to 2.11 MPa and 4.22 of their respective initial values. Also, at the applied current of 1.25 A, the damping force of the MR valve controlled cylinder system enlarged by 46 %, with its optimal value being 3.65 kN and initial value as 2.50 kN, which was an excellent verification of the correctness of the RSM and the effectiveness of the optimal design.