检索结果-南通市图书馆

Defence Technology（防务技术） 2020年第2期16卷 290-298页

作者： Wen-long Xu Cheng Wang Jian-ming Yuan Wei-liang Goh Tao Li State Key lab of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China temasek laboratories Nanyang Technological University50 Nanyang Drive637553Singapore

In order to give the energy output structure of typical explosives near-ground explosion in real ground conditions,the free-field shockwave,ground reflection shockwave and Mach wave overpressure time history of composition B explosive,RDX explosive and aluminized explosive were measured by air pressure sensors and ground pressure *** shape of the free-field shock wave,ground reflection shock wave,and Mach wave and explosion flame were captured by high-speed *** experimental results show that,at the same horizontal distance from the initiation point,the peak overpressure of explosive shock wave of composition B explosive,both in the air and on the ground,is less than that of RDX and aluminized *** a distance of 3.0 m from the initiation point,the peak overpressure of aluminized explosives is slightly less than that of RDX *** to the exothermic effect of aluminum powder,the pressure drop of aluminized explosives is slower than that of RDX *** 5.0 m from the initiation point,the peak overpressure of aluminized explosives is larger than that of RDX *** the same position from the initiation point,among the three kinds of explosives,the impulse of aluminized explosives is the maximum and the impulse of composition B explosives is the *** the increase of the horizontal distance from the initiation point,the height of Mach triple-points(Mach steam)of the three explosives increases *** the same horizontal distance from the initiation point,there is poorly difference in the height of Mach triple-points between aluminized explosive and RDX explosive,and the height of Mach triple-points of composition B explosive is much smaller than that of other two *** maximum diameter and duration of the fireball formed by aluminized explosives are the largest,followed by composition B explosive,and the maximum diameter and duration of the fireball formed by RDX explosive are the smallest.

关键词： Near-ground blast Reflected wave Marcher steam Aluminized explosives

维普期刊数据库

Bore-center annular shaped charges with different liner materials penetrating into steel targets

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2019年第5期15卷 796-801页

作者： Wen-long Xu Cheng Wang Jian-ming Yuan Tao Deng State Key lab of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China temasek laboratories Nanyang Technological University50 Nanyang Drive637553Singapore

The bore-center annular shaped charge(BCASC)is a new type of shaped charge which can generate a larger-diameter hole in steel targets than classical shaped *** this paper,the influence of three liner materials,***,nickel and copper,on BCASC formation and penetrating into steel targets was investigated by experiment and numerical *** simulation results were well consistent with the experimental *** study showed that,at 0.50D standoff distance,the axial velocity of the molybdenum projectile was lower than that of the nickel and copper *** nickel and copper projectiles had almost the same head *** absolute values of the radial velocity of the molybdenum projectile head was lower than that of the nickel and copper ***,at 0.75D standoff distance,the absolute values of the radial velocity of the molybdenum projectile head became much greater than that of the nickel and copper projectile *** projectile formed by BCASC with the molybdenum liner had the highest penetration depth of 61.5 mm,which was 10.0%and 21.3%higher than that generated by the copper and nickel projectiles.

关键词： Annular shaped charge Liner material Formation Numerical simulation

维普期刊数据库

A survey on recent progress in control of swarm systems

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第7期60卷 5-28页

作者： Bing ZHU Lihua XIE Duo HAN Xiangyu MENG Rodney TEO School of Electrical and Electronic Engineering Nanyang Technological University The Seventh Research Division Beihang University Division of Systems Engineering Boston University temasek lab National University of Singapore

It has been witnessed that swarm systems are superior to individual agents in performing complicated tasks. In recent years, new results in some branches of control for swarm systems have developed and investigated with respect to various objectives and scenarios. This survey is to take a glimpse into some newly developed control techniques for swarm systems, especially those presented after 2013. The covered topics include some up-to-date progress in the areas of consensus, formation, flocking, containment, optimal coverage/mission planning, and sensor networks. Contributions and connections of the mentioned references are discussed *** on the new results in control of swarm systems, some possible new future research topics are suggested.

关键词： formation swarm systems consensus containment flocking sensor networks

Implementation of Caterpillar Inspired Rolling Gait and Nonlinear Control Strategy in a Spherical Robot

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2018年第2期15卷 313-328页

作者： Abhra Roy Chowdhury Gim Song Soh Shaohui Foong Kristin L. Wood temasek laboratories Engineering Product Development Pillar Singapore University of Technology and Design Singapore 487372 SUTD-MIT International Design Centre Singapore University of Technology and Design Singapore 487372

This paper presents a novel Central Pattern Generator （CPG） based rolling gait generation in a small-sized spherical robot and its nonlinear control mechanism. A rhythmic rolling pattern mimicking Pleurotya caterpillar is produced for the spherical robot locomotion. A synergetically combined feedforward-feedback control strategy is proposed. The feedforward component is generated from centrally connected network of CPGs in conjunction with nonlinear robot dynamics. Two nonlinear feedback control methods namely integral （first order） Sliding Mode Control （SMC） and High （or second） Order Sliding Mode Control （HOSMC） are proposed to regulate robot stability and gait robustness in the presence of matched parameter uncertainties and bounded external disturbances. Design, implementation and experimental evaluation of both roll gait control strategies for the spherical robot are done on smooth （indoor） and irregular （outdoor） ground surfaces, The performance of robot control is quantified by measuring the roll angle stability, phase plane convergence and wheel velocities. Experimental results show that proposed novel strategy is efficient in producing a stable rolling gait and robust control of a spherical robot on two different types of surfaces. It further shows that proposed high HOSMC strategy is more efficient in robust rolling gait control of a spherical robot compared to an integral first-order SMC on two different ground conditions.

关键词： bioinspired spherical robot rolling gait CPG rolling friction integral first-order SMC control HOSMC

A Chromosome-level Reference Genome of African Oil Palm Provides Insights into Its Divergence and Stress Adaptation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genomics, Proteomics & Bioinformatics 2023年第3期21卷 440-454页

作者： Le Wang May Lee Zi Yi Wan Bin Bai Baoqing Ye Yuzer Alfiko Rahmadsyah Rahmadsyah Sigit Purwantomo Zhuojun Song Antonius Suwanto Gen Hua Yue temasek Life Sciences laboratory Singapore 117604Singapore Wheat Research Institute Gansu Academy of Agricultural SciencesLanzhou 730070China Biotech lab Wilmar InternationalBekasi 17530Indonesia R&D Department Wilmar International PlantationPalembang 30118Indonesia Department of Biological Sciences National University of SingaporeSingapore 117558Singapore

The palm family(Arecaceae),consisting of2600 species,is the third most economically important family of *** African oil palm(Elaeis guineensis)is one of the most important ***,the genome sequences of palms that are currently available are still limited and ***,we report a high-quality chromosome-level reference genome of an oil palm,Dura,assembled by integrating long reads with150 genome *** assembled genome was 1.7 Gb in size,covering 94.5%of the estimated genome,of which 91.6%was assigned into 16 pseudochromosomes and 73.7%was repetitive *** on the conserved synteny with oil palm,the existing draft genome sequences of both date palm and coconut were further assembled into chromosomal *** burst,particularly long terminal repeat retrotransposons,following the last whole-genome duplication,likely explains the genome size variation across *** analysis of the VIRESCENS gene in palms suggests that DNA variations in this gene are related to fruit *** duplications of highly tandemly repeated pathogenesis-related proteins from the same tandem arrays play an important role in defense responses to ***-genome resequencing of both ancestral African and introduced oil palms in Southeast Asia reveals that genes under putative selection are notably associated with stress responses,suggesting adaptation to stresses in the new *** genomic resources and insights gained in this study could be exploited for accelerating genetic improvement and understanding the evolution of palms.

关键词： Oil palm Genome Evolution VIRESCENS Molecular breeding

Crystal Structure of Arabidopsis thaliana Dawdle Forkhead-Associated Domain Reveals a Conserved Phospho-Threonine Recognition Cleft for Dicer-Like 1 Binding

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Molecular Plant 2013年第4期6卷 1290-1300页

作者： Satoru Machida Y.Adam Yuan Department of Biological Sciences and Centre for Bioimaging Sciences National University of Singapore 14 Science Drive 4 Singapore 117543 Singapore temasek Lifesciences laboratory National University of Singapore 1 Research Link Singapore 117604 Singapore Mechanobiology Institute National University of Singapore T-lab Building 5A Engineering Drive 1 Singapore 117411 Singapore

Dawdle （DDL） is a microRNA processing protein essential for the development of Arabidopsis. DDL contains a putative nuclear localization signal at its amino-terminus and forkhead-associated （FHA） domain at the carboxyl-termi- nus. Here, we report the crystal structure of the FHA domain of Arabidopsis Dawdle, determined by multiple-wavelength anomalous dispersion method at 1.7-A resolution. DDL FHA structure displays a seven-stranded 13-sandwich architec- ture that contains a unique structural motif comprising two long anti-parallel strands. Strikingly, crystal packing of the DDL FHA domain reveals that a glutamate residue from the symmetry-related DDL FHA domain, a structural mimic of the phospho-threonine, is specifically recognized by the structurally conserved phospho-threonine binding cleft. Consistently with the structural observations, co-immuno-precipitation experiments performed in Nicotiana benthami- ana show that the DDL FHA domain co-immuno-precipitates with DCL1 fragments containing the predicted pThr＋3（lle/ Val/Leu/Asp） motif. Taken together, we count the recognition of the target residue by the canonical binding cleft of the DDL FHA domain as the key molecular event to instate FHA domain-mediated protein-protein interaction in plant miRNA processing.

关键词： Arabidopsis DCL1 Arabidopsis DDL forkhead-associated domain phospho-threonine microRNA processing.

Insects as a feed ingredient for fish culture: Status and trends

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2022年第2期7卷 166-178页

作者： Yuzer Alfiko Dizhi Xie Retno Tri Astuti Joey Wong Le Wang Biotechnology Research and Development Division Seed Wilmar Indonesia LtdCikarangBekasi17530Indonesia College of Marine Sciences South China Agricultural UniversityGuangzhou510642China Department of Fishery Product Technology Faculty of Fisheries and Marine ScienceBrawijaya UniversityEast Java65145Indonesia School of Biological Sciences Nanyang Technological University60 Nanyang Drive637551Singapore temasek Life Sciences lab 1 Research LinkNational University of Singapore117604Singapore

Fish culture plays an important role in supplying high-quality proteins and omega-3(n-3)long-chain polyunsaturated fatty *** has been the fastest growing sector in *** is an important component of commercial fish feeds,but ensuring a sustainable supply of fishmeal is in question.A good source of proteins in aquafeeds is *** the past 20 years,investigations have been carried out on insect meals as alternative sources for *** far,the results on replacing fishmeal in feeding aquaculture species have been ***,some challenging issues including costs and scaling up of insect production *** this review,we aim to summarize the status of applying meals of eight insect species in formulated *** also discussed issues in replacing fishmeal in fish feeds with insect meals and listed some future research directions to make insect meals an important source of proteins for green,profitable and sustainable(GPS)*** is certain that in the near future,large-scale insect farming and processing to produce insect meals as an ingredient of fish feeds will have positive impact on the sustainability and profitability of aquaculture.

关键词： Fish Feed fly Worm Performance

LAMP for the rapid diagnosis of iridovirus in aquaculture

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Aquaculture and Fisheries 2022年第2期7卷 158-165页

作者： Yepin Yu Zituo Yang Le Wang Fei Sun May Lee Yanfei Wen Qiwei Qin Gen Hua Yue temasek Life Sciences laboratory National University of Singapore1 Research Link117604Singapore Joint laboratory of Guangdong Province and Hong Kong Region on Marine Bioresource Conservation and Exploitation College of Marine SciencesSouth China Agricultural UniversityGuangzhou510642China Department of Biological Sciences National University of Singapore14 Science Drive117543Singapore

Iridoviruses are DNA virus and have caused huge economic losses in the aquaculture *** aim of this study was to establish a colorimetric loop-mediated isothermal amplification(LAMP)protocol for the on-site detection of Singapore grouper iridovirus(SGIV).The SGIV-VP61 gene was chosen as the target gene to develop a colorimetric LAMP *** optimized condition of the colorimetric LAMP assay was incubation at 63℃ for 1 *** infected with SGIV could be detected with the color change from yellow into *** sensitivity of the developed assay is 5.66 copies/μL of the viral DNA *** sensitivity was about 1000 times higher than that of conventional PCR while it was slightly lower than the one-step semi-nested PCR assay.A total of 60 DNA samples extracted from the fin tissue of the SGIV-infected Asian seabass were examined for SGIV by colorimetric LAMP,semi-nested PCR and conventional *** results of the colorimetric LAMP assay showed 94.87%agreement with the semi-nested *** addition,the DNA extraction method using NaOH showed a better performance in the colorimetric LAMP *** together,the colorimetric LAMP established was a sensitive,rapid and specific method for the detection of *** was not detected in samples randomly taken from a genetically improved line of the Asian ***,some seabass obtained from the local markets were found to contain ***,the LAMP assay has the potential application in the diagnosis of iridovirus diseases in the aquaculture industry.

关键词： Fish Disease Iridovirus Diagnosis PCR Seabass

Reverse Genetic Analysis of Adaptive Mutations within the Capsid Proteins of Enterovirus 71(EV-A71) Strains Necessary for Infection of CHO-K1 Cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Virologica Sinica 2020年第1期35卷 110-114页

作者： Carla Bianca Luena Victorio Yishi Xu Qimei Ng Vincent T.K.Chow Kaw Bing Chua temasek Lifesciences laboratory 1 Research LinkNational University of SingaporeSingapore 117604Singapore Host and Pathogen Interactivity laboratory Department of MicrobiologyYong Loo Lin School of MedicineNational University Health SystemNational University of SingaporeSingapore 117545Singapore Present Address:laboratory for Translational and Molecular Imaging Cancer and Stem Cell Biology ProgrammeDuke-NUS Medical SchoolSingapore 169857Singapore

Dear Editor,Previous studies had described the adaptation of enterovirus 71(EV-A71)strains that enabled entry and viral replication in Chinese Hamster Ovary(CHO)cell line(Zaini and McMinn 2012;Zaini et al.2012).These adapted strains derived from serial passage of a clinical isolate in CHO cells exhibited an amino acid substitution at VP2149,which enhanced viral replication by 100*1000-fold compared to the clinical *** VP2149 mutation was claimed responsible for adaptation to CHO-K1 cells without performing detailed molecular analyses to support these *** this study,we evaluate various VP1 and VP2 mutations in two CHO-adapted EV-A71 strains derived in our lab to assess their contribution to the phenotype of CHO cell adaptation.

关键词： adapted passage claimed

维普期刊数据库