检索结果-内蒙古大学图书馆

GPS spoofer countermeasure effectiveness based on signal strength, noise power, and c/N0 measurements

INTERNATIONAL JOURNAL OF SATELLITE cOMMUNIcATIONS AND NETWORKING 2012年第4期30卷 181-191页

作者： Jahromi, Ali Jafarnia Broumandan, Ali Nielsen, John Lachapelle, Gerard Univ Calgary Geomat Engn Dept Posit Locat & Nav PLAN Grp Calgary AB Canada Univ Calgary Dept Elect & Comp Engn Calgary AB Canada

Spoofing sources can effectively disrupt a GPS receiver during the acquisition phase by generating multiple false correlation peaks and increasing the noise floor. Such deceptive correlation peaks can mislead the GPS receiver into acquiring the spoofer generated signals rather than the authentic signals. Also, the spoofer can increase the receiver noise floor to bury the authentic signals in the noise and at the same time generate correlation peaks with amplitudes commensurate with reasonable c/N0 expectations. The main focus of this paper is on assessment of the reduced effectiveness of the GPS spoofer countermeasure during acquisition where the GPS receiver utilizes c/N0 discrimination. As shown, whereas the c/N0 discrimination is of limited effectiveness, with a modest circuit modification, the receiver can measure the absolute power of the correlation peaks, which is an effective means of detecting and discriminating spoofer sources. It will be shown that employing absolute power monitoring technique considerably reduces the vulnerability region of the receiver compared with the c/N0 monitoring techniques. copyright (c) 2012 John Wiley & Sons, Ltd.

关键词： GPS anti-spoofing c N0 analysis noise power analysis absolute power analysis

来源：评论

学校读者我要写书评

暂无评论

Preparation of PdAucu/c as a Highly Active catalyst for the Reduction of 4-Nitrophenol by controlling the Deposition of Noble Metals

引用

cHEMISTRY-AN ASIAN JOURNAL 2021年第2期16卷 165-173页

作者： Duan, Ying Ma, Yangyang Xie, Yanfu Li, Dongmi Deng, Dongsheng Zhang, chi Yang, Yanliang Luoyang Normal Univ Coll Chem & Chem Engn Henan Key Lab Funct Oriented Porous Mat Luoyang 471934 Peoples R China Luoyang Normal Univ Coll Food & Drug Luoyang 471934 Peoples R China Henan Agr Univ Coll Food Sci & Technol 95 Wenhua Rd Zhengzhou 450002 Peoples R China

The reasonable control of the dispersion of noble metals is an important topic for heterogeneous catalysts. In this manuscript, Pdcu/c, Aucu/c and PdAucu/c were prepared by the galvanic reduction method to ensure that Pd and Au follow the distribution of cu nanoparticles. The catalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive spectrometer elemental mappings and lines scans. Both the Pd and Au had very high dispersion no matter whether they were introduced individually or simultaneously. The Pd and Au were distributed mainly on the cu nanoparticles as evidenced by the energy-dispersive spectrometer elemental mappings and lines scans. The reduction of 4-nitrophenol was used as a model reaction for the prepared catalysts. Pdcu/c and Aucu/c showed high activity for this reaction compared to the literature, and the activity could be further increased by the introduction of Pd and Au in an appropriate ratio at the same time. The normalized reaction rate reached 2.005 s(-1) mM(-1) for the PdAucu/c-2.0, in which the mole ratio of Pd to Au was 2.0.

关键词： PdAucu c galvanic reduction 4-nitrophenol NaBH4

来源：评论

学校读者我要写书评

暂无评论

Robust Electrodes Based on coaxial Tic/c-MnO2 core/Shell Nanofiber Arrays with Excellent cycling Stability for High-Performance Supercapacitors

引用

SMALL 2015年第15期11卷 1847-1856页

作者： Zhang, Xuming Peng, Xiang Li, Wan Li, Limin Gao, Biao Wu, Guosong Huo, Kaifu chu, Paul K. City Univ Hong Kong Dept Phys & Mat Sci Kowloon Hong Kong Peoples R China Huazhong Univ Sci & Technol Wuhan Natl Lab Optoelect Wuhan 430074 Peoples R China

A coaxial electrode structure composed of manganese oxide-decorated Tic/c core/shell nanofiber arrays is produced hydrothermally in a KMnO4 solution. The pristine Tic/c core/shell structure prepared on the Ti alloy substrate provides the self-sacrificing carbon shell and highly conductive Tic core, thus greatly simplifying the fabrication process without requiring an additional reduction source and conductive additive. The as-prepared electrode exhibits a high specific capacitance of 645 F g(-1) at a discharging current density of 1 A g(-1) attributable to the highly conductive Tic/c and amorphous MnO2 shell with fast ion diffusion. In the charging/discharging cycling test, the as-prepared electrode shows high stability and 99% capacity retention after 5000 cycles. Although the thermal treatment conducted on the as-prepared electrode decreases the initial capacitance, the electrode undergoes capacitance recovery through structural transformation from the crystalline cluster to layered birnessite type MnO2 nanosheets as a result of dissolution and further electrodeposition in the cycling. 96.5% of the initial capacitance is retained after 1000 cycles at high charging/discharging current density of 25 A g(-1). This study demonstrates a novel scaffold to construct MnO2 based Scs with high specific capacitance as well as excellent mechanical and cycling stability boding well for future design of high-performance MnO2-based Scs.

关键词： supercapacitors MnO2 Tic c nanostructures structural transformations cycling stability electrodes

来源：评论

学校读者我要写书评

暂无评论

ZNF143 protein is an important regulator of the myeloid transcription factor c/EBP

引用

JOURNAL OF BIOLOGIcAL cHEMISTRY 2017年第46期292卷 18924-18936页

作者： Gonzalez, David Luyten, Annouck Bartholdy, Boris Zhou, Qiling Kardosova, Miroslava Ebralidze, Alex Swanson, Kenneth D. Radomska, Hanna S. Zhang, Pu Kobayashi, Susumu S. Welner, Robert S. Levantini, Elena Steidl, Ulrich chong, Gilbert collombet, Samuel choi, Min Hee Friedman, Alan D. Scott, Linda M. Alberich-Jorda, Meritxell Tenen, Daniel G. Natl Univ Singapore Canc Sci Inst Singapore 117599 Singapore Harvard Med Sch Harvard Stem Cell Inst Boston MA 02115 USA ASCR Inst Mol Genet Videnska 1083 Prague 14220 Czech Republic Charles Univ Prague Childhood Leukaemia Invest Prague Univ Hosp Motol Fac Med 2 Prague 15006 Czech Republic Harvard Med Sch Beth Israel Deaconess Med Ctr Boston MA 02115 USA Univ Alabama Birmingham Hematol Oncol Dept Birmingham AL 35294 USA CNR Inst Biomed Technol I-56124 Pisa Italy Johns Hopkins Univ Baltimore MD 21231 USA Univ Queensland Diamantina Inst Translat Res Inst Brisbane Qld 4102 Australia Ohio State Univ Comprehens Canc Ctr Columbus OH 43210 USA Albert Einstein Coll Med Dept Cell Biol New York NY 10461 USA Albert Einstein Coll Med Dept Med Oncol New York NY 10461 USA

The transcription factor c/EBP is essential for myeloid differentiation and is frequently dysregulated in acute myeloid leukemia. Although studied extensively, the precise regulation of its gene by upstream factors has remained largely elusive. Here, we investigated its transcriptional activation during myeloid differentiation. We identified an evolutionarily conserved octameric sequence, cccAGcAG, approximate to 100 bases upstream of the cEBPA transcription start site, and demonstrated through mutational analysis that this sequence is crucial for c/EBP expression. This sequence is present in the genes encoding c/EBP in humans, rodents, chickens, and frogs and is also present in the promoters of other c/EBP family members. We identified that ZNF143, the human homolog of the Xenopus transcriptional activator STAF, specifically binds to this 8-bp sequence to activate c/EBP expression in myeloid cells through a mechanism that is distinct from that observed in liver cells and adipocytes. Altogether, our data suggest that ZNF143 plays an important role in the expression of c/EBP in myeloid cells.

关键词： ccAAT-enhancer-binding protein (c EBP) gene regulation hematopoiesis promoter transcription factor c EBPalpha ZNF143

来源：评论

学校读者我要写书评

暂无评论

Histone demethylase KDM5A is transactivated by the transcription factor c/EBP and promotes preadipocyte differentiation by inhibiting Wnt/-catenin signaling

引用

JOURNAL OF BIOLOGIcAL cHEMISTRY 2019年第24期294卷 9642-9654页

作者： Guo, Liang Guo, Ying-Ying Li, Bai-Yu Peng, Wan-Qiu Tang, Qi-Qun Fudan Univ Key Lab Metab & Mol Med Minist Educ Dept Biochem & Mol BiolSch Basic Med Sci Shanghai 200032 Peoples R China Fudan Univ Dept Endocrinol & Metab Zhongshan Hosp Shanghai 200032 Peoples R China

beta-catenin signaling is triggered by WNT proteins and is an important pathway that negatively regulates adipogenesis. However, the mechanisms controlling the expression of WNT proteins during adipogenesis remain incompletely understood. Lysine demethylase 5A (KDM5A) is a histone demethylase that removes trimethyl (me3) marks from lysine 4 of histone 3 (H3K4) and serves as a general transcriptional corepressor. Here, using the murine 3T3-L1 preadipocyte differentiation model and an array of biochemical approaches, including chIP, immunoprecipitation, RT-qPcR, and immunoblotting assays, we show that Kdm5a is a target gene of ccAAT/enhancer-binding protein (c/EBP), an important early transcription factor required for adipogenesis. We found that c/EBP binds to the Kdm5a gene promoter and transactivates its expression. We also found that siRNA-mediated KDM5A down-regulation inhibits 3T3-L1 preadipocyte differentiation. The KDM5A knockdown significantly up-regulates the negative regulator of adipogenesis Wnt6, having increased levels of the H3K4me3 mark on its promoter. We further observed that WNT6 knockdown significantly rescues adipogenesis inhibited by the KDM5A knockdown. Moreover, we noted that c/EBP negatively regulates Wnt6 expression by binding to the Wnt6 gene promoter and repressing Wnt6 transcription. Further experiments indicated that KDM5A interacts with c/EBP and that their interaction cooperatively inhibits Wnt6 transcription. Of note, c/EBP knockdown impaired the recruitment of KDM5A to the Wnt6 promoter, which had higher H3K4me3 levels. Our results suggest a mechanism involving c/EBP and KDM5A activities that down-regulates the Wnt/-catenin pathway during 3T3-L1 preadipocyte differentiation.

关键词： adipogenesis ccAAT enhancer-binding protein (c EBP) histone demethylase Wnt signaling beta-catenin (B-catenin) epigenetics post-translational modification (PTM) obesity chromatin immunoprecipitation (chiP) 3T3-L1 preadipocyte adipogenesis c EBPbeta lysine demethylase 5A (KDM5A) Wnt beta-catenin pathway fat cell chIP-on-chip

来源：评论

学校读者我要写书评

暂无评论

EXPLOITING MULTIMEDIA EXTENSIONS IN c++: A PORTABLE APPROAcH

引用

cOMPUTING IN ScIENcE & ENGINEERING 2012年第5期14卷 72-77页

作者： Esterie, Pierre Gaunard, Mathias Falcou, Joel Lapreste, Jean-Thierry Univ Paris Sud LRI Paris France

Single instruction, multiple data (SIMD) extensions have been a feature of choice for processor manufacturers for a couple of decades. Designed to provide significant accelerations, they require expertise, the use of potentially fragile compiler support, or vendor-specific libraries. Here, a c++ template library called *** is presented that simplifies the exploitation of SIMD hardware within a standing c++ programming model.

关键词： Scientific computing computational Modeling Hardware Instruction Sets Programming Scientific computing SIMD Hardware c computational Science Scientific Programming

来源：评论

学校读者我要写书评

暂无评论

Frama-c: A software analysis perspective

引用

FORMAL ASPEcTS OF cOMPUTING 2015年第3期27卷 573-609页

作者： Kirchner, Florent Kosmatov, Nikolai Prevosto, Virgile Signoles, Julien Yakobowski, Boris CEA LIST Software Reliabil Lab F-91191 Gif Sur Yvette France

Frama-c is a source code analysis platform that aims at conducting verification of industrial-size c programs. It provides its users with a collection of plug-ins that perform static analysis, deductive verification, and testing, for safety- and security-critical software. collaborative verification across cooperating plug-ins is enabled by their integration on top of a shared kernel and datastructures, and their compliance to a common specification language. This foundational article presents a consolidated view of the platform, its main and composite analyses, and some of its industrial achievements.

关键词： Formal verification Static analysis Dynamic analysis c

来源：评论

学校读者我要写书评

暂无评论

Modular information hiding and type-safe linking for c

引用

IEEE TRANSAcTIONS ON SOFTWARE ENGINEERING 2008年第3期34卷 357-376页

作者： Srivastava, Saurabh Hicks, Michael Foster, Jeffrey S. Jenkins, Patrick Univ Maryland Dept Comp Sci College Pk MD 20742 USA

This paper presents cMOD, a novel tool that provides a sound module system for c. cMOD works by enforcing a set of four rules that are based on principles of modular reasoning and on current programming practice. cMOD's rules flesh out the convention that. h header files are module interfaces and. c source files are module implementations. Although this convention is well known, existing explanations of it are incomplete, omitting important subtleties needed for soundness. In contrast, we have formally proven that cMOD's rules enforce both information hiding and type-safe linking. To use cMOD, the programmer develops and builds their software as usual, redirecting the compiler and linker to cMOD's wrappers. We evaluated cMOD by applying it to 30 open source programs, totaling more than one million lines of code. Violations to cMOD's rules revealed more than a thousand information hiding errors, dozens of typing errors, and hundreds of cases that, although not currently bugs, make programming mistakes more likely as the code evolves. At the same time, programs generally adhere to the assumptions underlying cMOD's rules and, so, we could fix rule violations with a modest effort. We conclude that cMOD can effectively support modular programming in c: It soundly enforces type-safe linking and information hiding while being largely compatible with existing practice.

关键词： coding tools and techniques c modules/packages information hiding type-safe linking cMOD software reliability

来源：评论

学校读者我要写书评

暂无评论

cyclic ablation behavior and microstructure evolution of multi-layer coating on c/c composites under oxyacetylene torch

引用

cERAMIcS INTERNATIONAL 2022年第15期48卷 21709-21716页

作者： Zhang, Jian Zhang, Yulei Zhang, Tien chen, Ruicong Zhu, Xiaofei Northwestern Polytech Univ Shaanxi Key Lab Fiber Reinforced Light Composite State Key Lab Solidificat Proc Xian 710072 Peoples R China Gen Design Dept Beijing Mech & Elect Engn Beijing 100089 Peoples R China

The cyclic ablation resistance of coated carbon/carbon (c/c) composites play crucial roles in their further engineering applications and development due to the cyclic ablation environment accompanied by rapid heating and cooling and high-speed heat flow scouring, which can reflect the performance stability of the coating. In this research, a (Sic/Hfc)4/Sic (SHS) multi-layer coating was prepared on c/c composites. compared with single layer (Sic and Hfc coating) coated sample, the mass and linear ablation rate of SHS coated sample after three ablation cycles (60 s x 3) were only 0.64 mg/s and 0.53 mu m/s, respectively. This is mainly because the introduction of many interfaces inhibits the propagation of cracks, the irregular cracks region only exists in the outer layer. Besides, the oxide layer with dense structure was formed near the c/c substrate, which could prevent oxygen from penetrating into the coating and continue to play a protective role.

关键词： c c composites Multilayer coatings cyclic ablation Hfc and Sic coating

来源：评论

学校读者我要写书评

暂无评论

Multimodal Stimulation in a Microfluidic Device Facilitates Studies of Interneurons in Sensory Integration in c. elegans

引用

SMALL 2020年第10期16卷 1905852-1905852页

作者： cho, Yongmin Lee, Sol Ah chew, Yee Lian Broderick, Kirby Schafer, William R. Lu, Hang Georgia Inst Technol Sch Chem & Biomol Engn Atlanta GA 30332 USA Med Res Council Lab Mol Biol Div Neurobiol Cambridge CB2 0QH England Harvard Med Sch Dept Syst Biol Boston MA 02115 USA Univ Wollongong Mol Horizons Wollongong NSW 2522 Australia Univ Wollongong Sch Chem & Mol Biosci Wollongong NSW 2522 Australia Illawarra Hlth & Med Res Inst Wollongong NSW 2522 Australia

Animals' perception and behavior involve integration of multiple sensory modalities. caenorhabditis elegans is a useful model for studying multimodal sensory integration, as it has well-characterized neuronal circuits in a relatively simple nervous system. However, most studies based on functional imaging have only been conducted on single modal stimuli, because well-controlled multimodal experiments for c. elegans are technically difficult. For instance, no single systems currently deliver precise stimuli with spatial, temporal, and intensity control, despite prior hypotheses that interneurons do integrate these sensory inputs to control behavior. Here, a microfluidic platform that can easily deliver spatially and temporally controlled combination stimuli to c. elegans is presented. With this platform, both sensory and interneuron activity is measured in response to mechanical and chemical stimulations in a quantitative and high-throughput manner. It is found that the activity of command interneuron PVc can be modulated by prior stimulation both within the same and across different modalities. The roles of monoaminergic and peptidergic signaling are further examined on the process of multimodal integration through PVc activity. The approach exemplified here is envisioned to be broadly applicable in different contexts to elucidate underlying mechanisms and identify genes affecting multisensory integration.

关键词： c elegans microfluidics multisensory integration PVc interneurons

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：