检索结果-南通市图书馆

Development of an all-fiber heterodyne lidar for range and velocity measurements

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第7期8卷 713-716页

作者：杨馥贺岩尚建华陈卫标 Shanghai Key Laboratory of All Solid-State Laser and Applied techniques Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

A 1550-nm all-fiber monostatic lidar system based on linear chirp amplitude modulation and heterodyne detection for the measurements of range and velocity is presented. The signal processing method is given, after which the relationship between the peak frequency values in the final signal spectrum, the target＇s range, and the line-of-sight velocity is obtained in the presence of the fiber end-face-reflected signal plaguing many monostatic lidar systems. The range of an electric fan as well as the line-of-sight fan speed of different levels is tested. This proposed system has a potential application for the space-borne landing system.

关键词： Chirp modulation Heterodyning Optical radar Velocity measurement

Conductively cooled 250-Hz single frequency Nd:YAG laser

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2010年第7期8卷 670-672页

作者：王君涛周军藏华国朱小磊陈卫标 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai Key Laboratory of All Solid-State Laser and Applied Techniques

A conductively cooled, laser diode （LD） end-pumped, injection-seeded single frequency Nd：YAG laser is designed and impleinented. The laser utilizes Nd：YAG rod as gain medium and compact dual-endpumping arrangement using two fiber-coupled LDs with a maximum output of 150 W. The optimized ramp-fire technique is applied to build reliable single longitudinal mode oscillating. The laser is capable of producing a 10-raJ Q-switched pulse with 13-ns pulse width at 1064 nm at a pulse repetition rate of 250 Hz. The output beam qualities M2 of approximately 1.19 and 1.22 in horizontal and vertical directions are detected, respectively.

关键词： Neodymium Pulse repetition rate Pulsed laser applications Pumping (laser)

Magnetically modified microbial cells:A new type of magnetic adsorbents

在线全文

学校读者我要写书评

暂无评论

China Particuology 2007年第1期5卷 19-25页

作者： Ivo Safarik Mirka Safarikova Department of Biomagnetic techniques Institute of Systems Biology and Ecology Academy of Sciences Na Sadkach 7 370 05 Ceske Budejovice Czech Republic

Microbial cells, either in free or immobilized form, can be used for the preconcentration or removal of metal ions, organic and inorganic xenobiotics or biologically active compounds. Magnetic modification of these cells enables to prepare magnetic adsorbents that can be easily manipulated in difficult-to-handle samples, such as suspensions, in the presence of external magnetic field. In this review, typical examples of magnetic modifications of microbial cells are presented, as well as their possible applications for the separation of organic xenobiotics and heavy metal ions.

关键词： Microbial cells Magnetic modification Magnetic iron oxide nanoparficles Magnetic adsorbents Magnetic fluids Xenobiotics

Laser Doppler vibrometer for real-time speech-signal acquirement

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第8期7卷 732-733页

作者：尚建华贺岩刘丹臧华国陈卫标 Shanghai Key Laboratory of All Solid-State Laser and Applied techniques Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

Laser Doppler vibrometer （LDV） has a potential application prospect in remote sensing. Based on the correlation theories of heterodyne detection, a LDV system with a configuration of all fiber and heterodyne techniques is developed to detect the sound signal through the vibration of glass. Experimental results show that the LDV system has an ability to acquire the real-time speech signal 25 m away through glass. While, the system signal-to-noise ratio （SNR） value decreases with the increase of the glass thickness and the detection distance.

关键词： Acoustic intensity Classifiers Correlation theory Doppler effect Glass Heterodyning Laser Doppler velocimeters Remote sensing Signal to noise ratio

20-kHz watt-level green laser with LGS crystal electro-optic Q-switch

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2009年第9期7卷 812-814页

作者：唐昊朱小磊孟俊清臧华国 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai Key Laboratory of All Solid-State Laser and Applied Techniques

A diode-end-pumped electro-optic （EO） Q-switched green laser operating at the repetition rate of 20 kHz is reported. A block of La3Ga5SiO14 （LGS） single crystal is used as a Q-switch and the type I phase- matching LiB305 （LBO） is used as the nonlinear crystal in the second harmonic generation. The 2.3-W average power of 532-nm green laser is obtained at the repetition rate of 20 kHz with the pulse width as short as 10 us. When the output power is about 1.5 W, the measured power fluctuation is less than 1.4% （root-mean-square. RMS） with the beam quality factor of M^2 〈 2 in both orthogonal directions.

关键词： Gallium Harmonic generation Nonlinear optics Pulsed laser applications Pumping (laser) Silicon compounds Single crystals

Conductively cooled 1-kHz single-frequency Nd:YAG laser for remote sensing

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2011年第8期9卷 58-61页

作者：王君涛朱韧周军臧华国朱小磊陈卫标 Shanghai Key Laboratory of All Solid-State Laser and Applied techniques Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences

A conductively cooled, laser diode （LD） end-pumped, injection-seeded single-frequency Nd：YAG laser is designed and implemented. The laser is capable of producing an 8-mJ Q-switched pulse with a ll-ns pulse width at 1 064 nm and at a pulse repetition rate of 1 000 Hz. At the maximum output energy of 8 m J, the frequency jitter is less than 3.5 MHz （root mean square （RMS）） over two minutes, and the linewidth is around 54.2 MHz. The M2 of the laser beam is approximately 1.30 in both horizontal and vertical direc- tions. The optimized ramp-fire technique is applied to build reliable single longitudinal mode oscillating.

关键词： Jitter Neodymium Pulse repetition rate Pumping (laser) Remote sensing

Rational Points on Genus 3 Real Hyperelliptic Curves

在线全文

学校读者我要写书评

暂无评论

Open Journal of Discrete Mathematics 2021年第4期11卷 103-113页

作者： Brice M. Miayoka Regis F. Babindamana Basile G. R. Bossoto Faculté Des sciences et techniques Université Marien Ngouabi Brazzaville Congo

We compute rational points on real hyperelliptic curves of genus 3 defined on whose Jacobian have Mordell-Weil rank r=0. We present an implementation in sagemath of an algorithm which describes the birational transformation of real hyperelliptic curves into imaginary hyperelliptic curves and the Chabauty-Coleman method to find C (). We run the algorithms in Sage on 47 real hyperelliptic curves of genus 3.

关键词： Hyperelliptic Curve Jacobian Coleman Integration Rational Point

Development of new cowpea(Vigna unguiculata)mutant genotypes,analysis of their agromorphological variation,genetic diversity and population structure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

BIOCELL 2021年第2期45卷 345-362页

作者： MADE DIOUF SARA DIALLO FRANÇOIS ABAYE BADIANE OUMAR DIACK DIAGA DIOUF Laboratoire Campus de Biotechnologies Végétales Département de Biologie VégétaleFacultédes Sciences et TechniquesUniversitéCheikh Anta DiopDakar-FannDakar10700Sénégal Facultédes sciences et Technologies de l’Education et de la Formation UniversitéCheikh Anta DiopDakar-FannDakar10700Sénégal

Cowpea is one of the most important legume grains in the sub-Saharan region of Africa used for human consumption and animal feed,but its production is hampered by biotic and abiotic constraints raising the need to broaden its genetic *** this purpose,seeds of two cowpea varieties Melakh and Yacine were irradiated with 300 and 340 Gy of gamma-ray,*** developed mutant populations were agromorphologically characterized from M5 to M7,while the genetic diversity of the latter was evaluated using 13 ISSR *** on the agromorphological characterization,variation of flower color,pod length,seed coat color,and seed weight with 78.01,68.29,94.48,and 57.58%heritability,respectively,were recorded in the mutant *** analyses allowed to identify the elite mutants based on their agromorphological traits,while Pearson’s correlation results revealed a positive correlation between yield and yield component *** subpopulations were identified through STRUCTURE analyses,but the assignment of the individuals in each group was improved using DAPC(Discriminant Analysis of Principal Components)*** of Molecular Variance revealed that the majority(85%)of the variance rather existed within groups than among(15%)***,our study allowed us to select new promising mutant genotypes that could be tested for multi-locational trials to evaluate their agronomic performance.

关键词： Agromorphological characterization Induced mutagenesis ISSR Plant breeding

OPERATOR NORM AND ERROR BOUNDS FOR INTERPOLATING QUADRATIC SPLINES ON A NON-UNIFORM TYPE-2 TRIANGULATION OF A RECTANGULAR DOMAIN

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Analysis in Theory and Applications 1994年第2期10卷 1-16页

作者： F. Jeeawock-Zedek Universite des sciences techniques de Lille Flandres-Artois France

The aim of this paper is to give upper bounds of the norm of the operator and associated error for a Lagrange interpolation problem by C^1 quadratic splines. The domain is rectangular and the type-2 triangulation is n... 详细信息

关键词：内经冰心刀工艺人产气