期刊文献+
共找到18篇文章
< 1 >
每页显示 20 50 100
Superpixel-Based Complex Field Modulation Using a Digital Micromirror Device for Focusing Light through Scattering Media 被引量:1
1
作者 You-Quan Jia Qi Feng +3 位作者 Bin Zhang Wei Wang Cheng-You Lin Ying-Chun Ding 《Chinese Physics Letters》 SCIE CAS CSCD 2018年第5期39-42,共4页
We present a digital micromirror device(DMD) based superpixel method for focusing light through scattering media by modulating the complex field of incident light. Firstly, we numerically and experimentally investig... We present a digital micromirror device(DMD) based superpixel method for focusing light through scattering media by modulating the complex field of incident light. Firstly, we numerically and experimentally investigate focusing light through a scattering sample using the superpixel methods with different target complex fields.Then, single-point and multiple-point focusing experiments are performed using this superpixel-based complex modulation method. In our experiment, up to 71.5% relative enhancement is realized. The use of the DMDbased superpixel method for the control of the complex field of incident light opens an avenue to improve the enhancement of focusing light through scattering media. 展开更多
关键词 DMD Superpixel-Based Complex field Modulation Using a Digital Micromirror Device for Focusing Light through Scattering Media
原文传递
Fabrication of Grain-oriented (Bi,Pb)_2Sr_2Ca_2Cu_3O_x Superconducting Tapes Using Magnetic Field and Vibration Technique
2
作者 Yanwei MA and Xianjin WANG (Dept. of Metal Forming, University of Science and Technology Beijing, Beijing 100083, China)Zutang WANG (Tsinghua University, Beijing 100084, China) 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1998年第1期86-88,共3页
Highly textured (Bi,Pb)2Sr2Ca2Cu3Ox superconducting tapes have been fabricated by means of magnetic-field and vibration technique. This method is an effective way of improving the degree of grain alignment and density... Highly textured (Bi,Pb)2Sr2Ca2Cu3Ox superconducting tapes have been fabricated by means of magnetic-field and vibration technique. This method is an effective way of improving the degree of grain alignment and density of oxide core in tapes after heat treatment and pressing cycles.Jc of above 20% was increased than that without treatment. 展开更多
关键词 Bi Pb PB Sr Fabrication of Grain-oriented x Superconducting Tapes Using Magnetic field and Vibration Technique Ca Cu
下载PDF
Calculation of the Duration of the Atomic Tunneling Ionization in a Strong Electrostatic Field by Using Bohmian Trajectories Approach
3
作者 郭福明 陈基根 +1 位作者 李苏宇 杨玉军 《Chinese Physics Letters》 SCIE CAS CSCD 2015年第7期47-49,共3页
The duration of a bound electron tunneling through the barrier formed by atomic potential and electrostatic field is calculated by the Bohmian trajectories scheme. The time of the tunneling ionization decreases with t... The duration of a bound electron tunneling through the barrier formed by atomic potential and electrostatic field is calculated by the Bohmian trajectories scheme. The time of the tunneling ionization decreases with the increase of the amplitude of the electrostatic field. By using the information about the position, velocity and force of the Bohmian trajectories, the dynamical process of tunneling through the barrier is investigated. 展开更多
关键词 Calculation of the Duration of the Atomic Tunneling Ionization in a Strong Electrostatic field by Using Bohmian Trajectories Approach
原文传递
RECONSTRUCTION OF PART OF AN ACTUAL BLAST-WAVE FLOW FIELD TO AGREE WITH EXPERIMENTAL DATA BY USING NUMERICAL METHOD WITH HIGH IDENTIFICATION
4
作者 吴清松 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 1989年第10期925-932,共8页
In this paper, on the basis of experimental data of two kinds of chemical explosions, the piston-pushing model of spherical blast-waves and the second-order Godunov-type scheme of finite difference methods with high i... In this paper, on the basis of experimental data of two kinds of chemical explosions, the piston-pushing model of spherical blast-waves and the second-order Godunov-type scheme of finite difference methods with high identification to discontinuity are used to the numerical reconstruction of part of an actual hemispherical blast-wave flow field by properly adjusting the moving bounary conditions of a piston. This method is simple and reliable. It is suitable to the evaluation of effects of the blast-wave flow field away from the explosion center. 展开更多
关键词 RECONSTRUCTION OF PART OF AN ACTUAL BLAST-WAVE FLOW field TO AGREE WITH EXPERIMENTAL DATA BY USING NUMERICAL METHOD WITH HIGH IDENTIFICATION ANFO TNT
下载PDF
Construction of PBIB Desings by Using Subspace of Vector Space over Finite Fields
5
作者 Wei Wandi (Dept. of Math. Sichuan University, Chengdu 610014)Yang Benfu ( Dept.of Math. Chengdu Teachers College, Pengzhou 611930) 《西华大学学报(哲学社会科学版)》 1998年第3期1-4,共4页
A new transitivity theorem of the general linear group GLn(Fq)is proved. A kind of new PBIB desings is constructed.
关键词 OVER Construction of PBIB Desings by Using Subspace of Vector Space over Finite fields
下载PDF
Detection of Environmental Toxins in Mixed Matrices of Tap Water, Soil, Food Waste, Serum and Milk Using Hememics Biosensor
6
作者 Srivatsa Aithal Sujasha Gupta +5 位作者 Khanh Duong Ankit Kumar Nathan Ho Dongdong Liu John Warden David Huy Ho 《Journal of Sensor Technology》 2023年第4期59-68,共10页
Exposure to toxins can lead to a wide range of adverse health effects, including respiratory problems, neurological disorders, cancer, and reproductive issues. Toxins can come from various sources, such as industrial ... Exposure to toxins can lead to a wide range of adverse health effects, including respiratory problems, neurological disorders, cancer, and reproductive issues. Toxins can come from various sources, such as industrial waste, agricultural runoff, and household chemicals. Therefore, detecting and monitoring toxins in the environment is crucial for protecting human health and the environment. This study aimed to evaluate the performance of Hememics biosensor system in detecting environmental toxins such as Ricin and Staphylococcal enterotoxin B (SEB) in mixed matrixes. When Ricin and SEB are spiked into soil, chopped lettuce, tap water, milk and serum, the biosensor was able to detect these toxins, without sample processing, at a level of detection comparable to lab testing with high sensitivity and specificity. Furthermore, Hememics biosensor system is designed to be network-enabled, which means that results can be transmitted to relevant agencies for quick decisions. This feature is crucial in cases where quick action is needed to prevent further contamination or exposure to harmful toxins. 展开更多
关键词 Portable Biosensor Graphene Based Biochip HemChip™ Rapid Detection field use NETWORKING
下载PDF
Control Effects of Bacillus subtilis DJ-6 and Pyraclostrobin Alone and in Combination Against Fusarium oxysporum 被引量:9
7
作者 吉沐祥 姚克兵 +3 位作者 李国平 吴祥 陈宏洲 庄义庆 《Agricultural Science & Technology》 CAS 2014年第11期2020-2025,共6页
[Objective] This study was conducted to screen a synergistic biological fungicide complex to control Fusarium wilt, reducing the use of chemical pesticides. [Method] The inhibitory effects of Bacil us subtilis DJ-6 an... [Objective] This study was conducted to screen a synergistic biological fungicide complex to control Fusarium wilt, reducing the use of chemical pesticides. [Method] The inhibitory effects of Bacil us subtilis DJ-6 and pyraclostrobin alone or in combination at five ratios against Fusarium oxysporum were detected by mea-suring mycelium growth rate in laboratory tests. The growth promotion and disease control effect of combined or single use of 20% pyraclostrobin and 2 ×1011 cfu/g B. subtilis DJ-6 WP at 1∶1 000, 1∶2 000 and 1∶3 000 dilutions were detected in field trials. [Result] The EC50 values of combined use of B. subtilis DJ-6 and pyra-clostrobin at ratios of 1∶1, 1∶2, 1∶3, 1∶4 and 1∶5 against F. oxysporum were 5.311 5, 4.008 6, 3.570 6, 3.350 9 and 3.218 9 μg/ml, with the synergistic ratios (SR) of 2.28, 1.77, 1.53, 1.64, 1.11, among which the synergetic effect at 1∶1 was the best. The fungicidal activity of pyraclostrobin was greater than that of B. subtilis DJ-6 in laboratory tests. Field trials revealed that al the 1∶1 000, 1∶2 000 and 1∶3 000 dilu-tions of 20% pyraclostrobin·2×1011 cfu/g B. subtilis DJ-6 WP in combination, 1∶1 000 dilution of 1 ×1012 cfu/g B. subtilis DJ-6 WP and 1∶2 000 dilution of 250 g/L pyra-clostrobin EC promoted the growth of strawberry by increasing plant height, leaf petiole, leaf blade area and stem diameter. Among them, the treatments with 1∶1 000 and 1∶2 000 of 20% pyraclostrobin · 2×1011 cfu/g B. subtilis DJ-6 WP in combina-tion had better effects than other treatments. The control effects of al the treat-ments were measured 30 and 80 d after fungicide application. The control effects of 1∶1 000 dilution of 20% pyraclostrobin and 2×1011 cfu/g B. subtilis DJ-6 in combina-tion were up to 100% and 93.11%, which were higher than those in al other treat-ments. The second highest control effects were found in the treatment with 1∶ 2 000 dilution of 20% pyraclostrobin and 2×1011 cfu/g B. subtilis DJ-6 in combination, they were 92.49% and 86.49%, higher than those in other treatments except the 1∶1 000 dilution of 20% pyraclostrobin and 2 ×1011 cfu/g B. subtilis DJ-6 in combination. The control effects of 1∶3 000 dilution of 20% pyraclostrobin and 2×1011 cfu/g B. subtilis DJ-6 in combination were 82.61% and 72.42%, higher than those in treatment with 1∶1 000 dilution of 1×1012 cfu/g B. subtilis DJ-6 WP, but lower than those in treat-ment with 1∶2 000 dilution of 25% pyraclostrobin EC. [Conclusion] Al the results re-vealed that the combination use of 20% pyraclostrobin and 2 ×1011 cfu/g B. subtilis DJ-6 WP at 1∶1 000 to 1∶2 000 dilution had better control effect against strawberry Fusarium wilt. 展开更多
关键词 Strawberry Fusarium wilt Bacil us subtilis DJ-6 Pyraclostrobin use in combination Antibacterial activity Plant growth traits field control effects
下载PDF
Tuning the fields focused by a high NA lens using spirally polarized beams(Invited Paper)
8
作者 F.Wackenhut B.Zobiak +1 位作者 A.J.Meixner A.V.Failla 《Chinese Optics Letters》 SCIE EI CAS CSCD 2017年第3期51-54,共4页
We show the power of spirally polarized doughnut beams as a tool for tuning the field distribution in the focus of a high numerical aperture (NA) lens. Different and relevant states of polarization as well as field ... We show the power of spirally polarized doughnut beams as a tool for tuning the field distribution in the focus of a high numerical aperture (NA) lens. Different and relevant states of polarization as well as field distributions can be created by the simple turning of a λ/2 retardation wave plate placed in the excitation path of a micro- scope. The realization of such a versatile excitation source can provide an essential tool for nanotechnology investigations and biomedical experiments. 展开更多
关键词 Tuning the fields focused by a high NA lens using spirally polarized beams HIGH
原文传递
The study of complex focussing acoustic field of a convex phased array probe used in ultrasonic diagnostic B-scanner
9
作者 LANG Yifu,BU Shuzhong, JIANG Nanxiang and CAI Chongcheng(Harbin Shipbuilding Engineering Institute ) 《Chinese Journal of Acoustics》 1991年第2期167-175,共9页
This paper reports a study of complex focussing acoustic fields of a convex phased array probe widely used in ultrasonic diagnostic B-scanner. The time delay necessary for electronic focussing and for geometric focuss... This paper reports a study of complex focussing acoustic fields of a convex phased array probe widely used in ultrasonic diagnostic B-scanner. The time delay necessary for electronic focussing and for geometric focussing of complex focussing is given. By means of Helmholtz's integral formula, the expressions of acoustic fields were obtained for the electronic focussing and complex focussing.With Simpson's numerical integral, a great deal of computations was carried out with an 86 / 330 computer. By means of using different parameters, an optimum focal range and beam width of a 4 sequences electronic and complex focussing acoustic system was selected. With an EUB-40 ultrasound diagnostic B-scanner produced by the Hitachi company, the lateral focussing acoustic field and lateral resolution in an echoic tank were photographed by latticing method and the experimental result is consistent with the theory. 展开更多
关键词 The study of complex focussing acoustic field of a convex phased array probe used in ultrasonic diagnostic B-scanner
原文传递
Early detection of neuropathy in leprosy:a comparison of five tests for field settings
10
作者 Inge Wagenaar Erik Post +4 位作者 Wim Brandsma Dan Ziegler Moshiur Rahman Khorshed Alam Jan Hendrik Richardus 《Infectious Diseases of Poverty》 SCIE 2017年第1期1034-1042,共9页
Background:Early detection and treatment of neuropathy in leprosy is important to prevent disabilities.A recent study showed that the Nerve Conduction Studies(NCS)and Warm Detection Thresholds(WDT)tests can detect lep... Background:Early detection and treatment of neuropathy in leprosy is important to prevent disabilities.A recent study showed that the Nerve Conduction Studies(NCS)and Warm Detection Thresholds(WDT)tests can detect leprosy neuropathy the earliest.These two tests are not practical under field conditions,however,because they require climate-controlled rooms and highly trained staff and are expensive.We assessed the usefulness of alternative test methods and their sensitivity and specificity to detect neuropathy at an early stage.Methods:Through a literature search we identified five alternative devices that appeared user-friendly,more affordable,portable and/or battery-operated:the Neuropad^(■),Vibratip^(TM),NC-Stat^(■)DPNCheck^(TM),NeuroQuick and the Thermal Sensibility Tester(TST),assessing respectively sweat function,vibration sensation,nerve conduction,cold sensation and warm sensation.In leprosy patients in Bangladesh,the posterior tibial and sural nerves that tested normal for the monofilament test and voluntary muscle test were assessed with the NCS and WDT as reference standard tests.The alternative devices were then tested on 94 nerves with abnormal WDT and/or NCS results and on 94 unaffected nerves.Sensitivity and specificity were the main outcomes.Results:The NeuroQuick and the TST showed very good sensitivity and specificity.On the sural nerve,the NeuroQuick had both a sensitivity and a specificity of 86%.The TST had a sensitivity of 83%and a specificity of 82%.Both the NC-Stat^(■)DPNCheck^(TM)and Vibratip^(TM)had a high specificity(88%and 100%),but a low sensitivity(16%and 0%).On the posterior tibial nerve,the NeuroQuick and the TST also showed good sensitivity,but the sensitivity was lower than for the sural nerve.The Neuropad^(■)had a sensitivity of 56%and a specificity of 61%.Conclusions:The NeuroQuick and TST are good candidates for further field-testing for reliability and reproducibility.The feasibility of production on a larger scale should be examined. 展开更多
关键词 LEPROSY NEUROPATHY Detection SUBCLINICAL field use
原文传递
Creation of radially polarized optical fields with multiple controllable parameters using a vectorial optical field generator 被引量:1
11
作者 Sichao Zhou Shiyi Wang +2 位作者 Jian Chen Guanghao Rui Qiwen Zhan 《Photonics Research》 SCIE EI 2016年第5期35-39,共5页
A vectorial optical field generator(VOF-Gen) based on two reflective phase-only liquid crystal spatial light modulators enables the creation of an arbitrary optical complex field. In this work, the capabilities of the... A vectorial optical field generator(VOF-Gen) based on two reflective phase-only liquid crystal spatial light modulators enables the creation of an arbitrary optical complex field. In this work, the capabilities of the VOF-Gen in terms of manipulating the spatial distributions of phase, amplitude, and polarization are experimentally demonstrated by generating a radially polarized optical field consisted of five annular rings, the focusing properties of which are also numerically studied with vectorial diffraction theory. By carefully adjusting the relative amplitude and phase between the adjacent rings, an optical needle field with purely longitudinal polarization can be produced in the focal region of a high numerical aperture lens. The versatile method presented in this work can be easily extended to the generation of a vectorial optical field with any desired complex distributions. 展开更多
关键词 Creation of radially polarized optical fields with multiple controllable parameters using a vectorial optical field generator SLM
原文传递
Light field head-mounted display with correct focus cue using micro structure array 被引量:4
12
作者 宋维涛 王涌天 +1 位作者 程德文 刘越 《Chinese Optics Letters》 SCIE EI CAS CSCD 2014年第6期39-42,共4页
A new type of light fiehl display is proposed using a head-mounted display (HMD) and a micro structure array (MSA, lens array or pinhole array). Each rendering point emits abundant rays from different directions i... A new type of light fiehl display is proposed using a head-mounted display (HMD) and a micro structure array (MSA, lens array or pinhole array). Each rendering point emits abundant rays from different directions into the viewer's pupil, and at one time the dense light field is generated inside the exit pupil of the HMD through the eyepiece. Therefore, the proposed method not only solves the problem of accommodation and convergence conflict in a traditional HMD, but also drastically reduces the huge data in real three-dimensional (3D) display. To demonstrate the proposed method, a prototype is developed, which is capable of giving the observer a real perception of depth. 展开更多
关键词 HMD Light field head-mounted display with correct focus cue using micro structure array MSA head
原文传递
Passively Q-switched ytterbium-doped fiber laser using the evanescent field interaction with bulk-like WTe_2 particles 被引量:2
13
作者 Seunghwan Ko Jinho Lee Ju Han Lee 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第2期108-112,共5页
The potential of bulk-like WTe2 particles for the realization of a passive Q-switch operating at the 1 μm wavelength was investigated. The WTe2 particles were prepared using a simple mechanical exfoliation method tog... The potential of bulk-like WTe2 particles for the realization of a passive Q-switch operating at the 1 μm wavelength was investigated. The WTe2 particles were prepared using a simple mechanical exfoliation method together with Scotch tape. By attaching bulk-like WTe2 particles, which remained on the top of the sticky surface of a small segment of the Scotch tape, to the flat side of a side-polished fiber, a saturable absorber(SA) was readily implemented. A strong saturable absorption was then readily obtained through an evanescent field interaction with the WTe2 particles. The modulation depth of the prepared SA was measured as ~2.18% at 1.03 μm. By incorporating the proposed SA into an all-fiberized ytterbium-doped fiber ring cavity, stable Qswitched pulses were readily achieved. 展开更多
关键词 length Passively Q-switched ytterbium-doped fiber laser using the evanescent field interaction with bulk-like WTe2 particles SA
原文传递
Modeling of the nonlinear acoustic field generated from a phased array using Gaussian superposition technique 被引量:4
14
作者 XU Yang GUO Xiasheng ZHANG Dong 《Chinese Journal of Acoustics》 2013年第4期357-365,共9页
The nonlinearity has significant effect on the ultrasonic therapy using phased ar- rays. A numerical approach is developed to calculate the nonlinear sound field generated from a phased array based on the Gaussian sup... The nonlinearity has significant effect on the ultrasonic therapy using phased ar- rays. A numerical approach is developed to calculate the nonlinear sound field generated from a phased array based on the Gaussian superposition technique. The parameters of the phased array elements are first estimated from the focal parameters using the inverse matrix algorithm; Then the elements are expressed as a set of Gaussian functions; Finally, the nonlinear sound field can be calculated using the Gaussian superposition technique. In the numerical simulation, a 64~ 1 phased array is used as the transmitter. In the linear case, the difference between the results of the Gaussian superposition technique and the Fresnel integral is less than 0.5%, which verifies the feasibility of the approach. In the nonlinear case, the nonlinear fields of single-focus modes and double-focus modes are calculated. The results reveal that the nonlinear effects can improve the focusing performance, and the nonlinear effects are related with the source pressures and the excitation frequencies. 展开更多
关键词 Modeling of the nonlinear acoustic field generated from a phased array using Gaussian superposition technique mode
原文传递
Teleportation of an unknown two-atom state using simultaneous interaction of two two-level atoms with cavity field 被引量:2
15
作者 向少华 宋克慧 《Chinese Optics Letters》 SCIE EI CAS CSCD 2003年第8期488-490,共3页
Proposal for the teleportation of two-atom state is presented. It is based on the simultaneous interaction of two two-level atoms with a single-mode cavity with a filed of n photons. In the proposed scheme, two pairs ... Proposal for the teleportation of two-atom state is presented. It is based on the simultaneous interaction of two two-level atoms with a single-mode cavity with a filed of n photons. In the proposed scheme, two pairs of EPR state are used as quantum channel to teleport an unknown two-atom state. The completed time is greatly reduced and cavity field is not required to be detected are shown to be the distinct features of the presented scheme. 展开更多
关键词 of on for be that into Teleportation of an unknown two-atom state using simultaneous interaction of two two-level atoms with cavity field with
原文传递
Measurement of high-dynamic temperature field using high-speed quadriwave lateral shearing interferometer
16
作者 崔博川 王建立 +1 位作者 姚凯男 陈涛 《Optoelectronics Letters》 EI 2018年第2期124-128,共5页
An approach to measure a high-dynamic two-dimensional(2 D) temperature field using a high-speed quadriwave lateral shearing interferometer(QWLSI) is proposed. The detailed theoretical derivation to express the wavefro... An approach to measure a high-dynamic two-dimensional(2 D) temperature field using a high-speed quadriwave lateral shearing interferometer(QWLSI) is proposed. The detailed theoretical derivation to express the wavefront reconstruct principle of the proposed method is presented. The comparison experiment with thermocouples shows that the temperature field measurement using QWLSI has a precision of ±0.5 °C. An experiment for measuring the highdynamic temperature field generated by an electrical heater is carried out. A 200 frame rate temperature field video with 512 × 512 resolution is obtained finally. Experimental results show that the temperature field measurement system using a QWLSI has the advantage of high sensitivity and high resolution. 展开更多
关键词 Measurement of high-dynamic temperature field using high-speed quadriwave lateral shearing interferometer
原文传递
Enhancing entanglement generation of two atoms in a cavity with white noise using classical driving fields
17
作者 张建松 陈爱喜 《Chinese Optics Letters》 SCIE EI CAS CSCD 2011年第4期91-94,共4页
We investigate the entanglement dynamics of a quantum system consisting of two two-level atoms in a cavity with classical driving fields in the presence of white noise. The cavity is initially prepared in the vacuum s... We investigate the entanglement dynamics of a quantum system consisting of two two-level atoms in a cavity with classical driving fields in the presence of white noise. The cavity is initially prepared in the vacuum state. Generally, the entanglement of two atoms decreases with the intensity of the thermal fields and the coupling strength of the two-level atoms to the thermal fields. However, we find that the entanglement of the quantum system can be enhanced by adjusting the frequency and the strength of the classical driving fields in the presence of white noise. 展开更多
关键词 Enhancing entanglement generation of two atoms in a cavity with white noise using classical driving fields
原文传递
Controlling nonadiabatic spectral redshift of high-order harmonic using two orthogonally polarized laser fields
18
作者 Hongmei Wu Shengjun Yue +3 位作者 Jinbin Li Silin Fu Bitao Hu Hongchuan Du 《Chinese Optics Letters》 SCIE EI CAS CSCD 2018年第4期11-15,共5页
We investigate the nonadiabatic spectral redshift of high-order harmonic of He driven by two time-delayed orthogonally polarized laser fields. It is found that the nonadiabatic spectral redshift can be observed by pro... We investigate the nonadiabatic spectral redshift of high-order harmonic of He driven by two time-delayed orthogonally polarized laser fields. It is found that the nonadiabatic spectral redshift can be observed by properly adjusting the time delay of the two laser fields when the controlling pulse is added in the raising part of the driving pulse in the vertical direction. That is because the controlling pulse in the vertical direction prevents the ionized electrons from returning to the vicinity of parent ions and then reduces the recombination probability. This leads to the high-order harmonic generated mainly in the falling part of the driving pulse. Meanwhile,we also find that the quantity of redshift can be effectively controlled through accommodating the positive time delays. In addition, this scheme can also be used to produce nonadiabatic spectral blueshift. 展开更多
关键词 Controlling nonadiabatic spectral redshift of high-order harmonic using two orthogonally polarized laser fields
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部