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期刊论文 36

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2023 4

2022 2

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关键词

CP);符号间干扰(inter symbol interference, ISI);载波间干扰(inter carrier interference 1

ICI);最大似然估计(maximum likelihood estimation 1

MLE) 1

OFDM);快速傅立叶变换(Fast Fourier transform, FFT);循环前缀(cyclic prefix 1

RNA干扰(RNAi) 1

SARS-CoV-2干扰 1

Z干扰信道;非正则信号;和速率;帕累托边界;协方差;伪协方差 1

传输性能分析模型 1

佩戴口罩 1

信息流分析;业务流程执行语言;Petri网;干扰性 1

地下无线电通信 1

基于RNA的生物防治 1

多用户干扰 1

大规模多输入多输出;全双工;小蜂窝;无线回程链路;分布式算法 1

大豆臭虫(SSB) 1

导电陶瓷复合材料 1

弱信号接收 1

抗雷电脉冲干扰 1

无人机;泊松点过程;多点协同;干扰统计特性;覆盖性能 1

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Elastoplastic frictional contact problem study on interference fits of compressor

ZHANG Hongwu, WU Changhua, LIAO Aihua

《能源前沿(英文)》 2008年 第2卷 第3期   页码 313-319 doi: 10.1007/s11708-008-0026-1

摘要: The FE parametric quadratic programming (PQP) method developed from the parametric variational principle (PVP) was used for the analysis of the stress distribution of the 3D elastoplastic frictional contact of an impeller-shaft sleeve-shaft. A locomotive-type turbocharger compressor with 24 blades under combined centrifugal and interference-fit loading was considered in the numerical analysis. The solution of elastoplastic frictional contact problems belongs to unspecified boundary problems where the interaction between two kinds of nonlinearities should occur. To save time in the numerical computation, a multi-substructure technique was adopted in the structural modeling. The effect of fit tolerance, wall thickness of the shaft sleeve, and rotational speed on the contact stress was discussed in detail in the numerical computation. To decrease the difficulty of the assembly process and ensure the safety of the working state, the amount of interference between the shaft sleeve and shaft by press-fitting should be controlled strictly to avoid the rapid increase of contact stress. The numerical results show that the algorithm has high accuracy and good convergence. The study can be referred to in deciding the proper fit tolerance and improving the design and manufacturing technology of compressor impellers.

关键词: computation     thickness     interference-fit     interference     unspecified    

Laser interference fabrication of large-area functional periodic structure surface

Lei WANG, Zi-Han WANG, Yan-Hao YU, Hong-Bo SUN

《机械工程前沿(英文)》 2018年 第13卷 第4期   页码 493-503 doi: 10.1007/s11465-018-0507-9

摘要:

Functional periodic structures have attracted significant interest due to their natural capabilities in regulating surface energy, surface effective refractive index, and diffraction. Several technologies are used for the fabrication of these functional structures. The laser interference technique in particular has received attention because of its simplicity, low cost, and high-efficiency fabrication of large-area, micro/nanometer-scale, and periodically patterned structures in air conditions. Here, we reviewed the work on laser interference fabrication of large-area functional periodic structures for antireflection, self-cleaning, and superhydrophobicity based on our past and current research. For the common cases, four-beam interference and multi-exposure of two-beam interference were emphasized for their setup, structure diversity, and various applications for antireflection, self-cleaning, and superhydrophobicity. The relations between multi-beam interference and multi-exposure of two-beam interference were compared theoretically and experimentally. Nanostructures as a template for growing nanocrystals were also shown to present future possible applications in surface chemical control. Perspectives on future directions and applications for laser interference were presented.

关键词: laser interference     four-beam interference     multi-exposure of two-beam interference     additive fabrication    

Construction and identification of lentiviral RNA interference vector of rat leptin receptor gene

Zhengjuan LIU, Jie BIAN, Yuchuan WANG, Yongli ZHAO, Dong YAN, Xiaoxia WANG

《医学前沿(英文)》 2009年 第3卷 第1期   页码 57-60 doi: 10.1007/s11684-009-0003-z

摘要: Leptin resistance is a main mechanism of acquired childhood obesity, and the suppression of long form of leptin receptor (OBRb) gene expression in diet-induced obese rats indicates that the down-regulation of OBRb gene expression plays a pivotal role in the mechanism of leptin resistance. The aim of the present study was to construct the lentiviral RNA interference (RNAi) vector of rat OBRb gene and evaluate the effects of siRNA on silencing OBRb gene expression. The target sequence of siRNA-OBRb was designed, and the complementary DNA containing both sense and antisense oligonucleotides was synthesized. After phosphorylation and annealing, these double-stranded DNA was cloned to pRNA-lentivector-VGFP to construct pRNA-Lenti-OBRb-VGFP recombinants with U6-containing promoter, target sequence and Poly III terminator. Then, the products were confirmed by electrophoresis and sequencing analysis, and the effects of RNAi on reducing gene expression were further confirmed by real-time polymerase chain reaction in transfected rat glioma cells expressing OBRb. The target sequence of siRNA-OBRb was successfully cloned to pRNA-lentivector-VGFP, and the RNAi protocol specifically reduced the expression of OBRb mRNA by approximately 80% compared with controls in transfected rat glioma cells. The successful construction of rat lentivirus vectors expressing OBRb-specific shRNA may be useful for further investigation .

关键词: receptors     leptin     RNA interference     lentivirus vector    

with multi-walled carbon nanotubes: preparation, characterization, and application for electromagnetic interference

Jian LI,Caichao WAN

《农业科学与工程前沿(英文)》 2015年 第2卷 第4期   页码 341-346 doi: 10.15302/J-FASE-2015082

摘要: Electromagnetic wave pollution has attracted extensive attention because of its ability to affect the operation of electronic machinery and endanger human health. In this work, the environmentally-friendly hybrid aerogels consisting of cellulose and multi-walled carbon nanotubes (MWCNTs) were fabricated. The aerogels have a low bulk density of 58.17 mg·cm . The incorporation of MWCNTs leads to an improvement in the thermal stability. In addition, the aerogels show a high electromagnetic interference (EMI) value of 19.4 dB. Meanwhile, the absorption-dominant shielding mechanism helps a lot to reduce secondary radiation, which is beneficial to develop novel eco-friendly EMI shielding materials.

关键词: cellulose aerogels     carbon nanotubes     electromagnetic interference shielding     composites    

Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems

Le YANG, Shuo WANG, Jianghua FENG

《机械工程前沿(英文)》 2018年 第13卷 第3期   页码 329-353 doi: 10.1007/s11465-018-0466-1

摘要:

Electromagnetic interference (EMI) causes electromechanical damage to the motors and degrades the reliability of variable-frequency drive (VFD) systems. Unlike fundamental frequency components in motor drive systems, high-frequency EMI noise, coupled with the parasitic parameters of the trough system, are difficult to analyze and reduce. In this article, EMI modeling techniques for different function units in a VFD system, including induction motors, motor bearings, and rectifier-inverters, are reviewed and evaluated in terms of applied frequency range, model parameterization, and model accuracy. The EMI models for the motors are categorized based on modeling techniques and model topologies. Motor bearing and shaft models are also reviewed, and techniques that are used to eliminate bearing current are evaluated. Modeling techniques for conventional rectifier-inverter systems are also summarized. EMI noise suppression techniques, including passive filter, Wheatstone bridge balance, active filter, and optimized modulation, are reviewed and compared based on the VFD system models.

关键词: variable-frequency drive (VFD)     electromagnetic interference (EMI)     motor drive modeling     EMI noise suppression    

Experimental study of aerodynamic interference effects on aerostatic coefficients of twin deck bridges

Zhiwen LIU , Zhengqing CHEN , Gao LIU , Xinpeng SHAO ,

《结构与土木工程前沿(英文)》 2009年 第3卷 第3期   页码 292-298 doi: 10.1007/s11709-009-0048-8

摘要: The aerodynamic interference effects on aerostatic coefficients of twin deck bridges with large span were investigated in detail by means of wind tunnel test. The distances between the twin decks and wind attack angles were changed during the wind tunnel test to study the effects on aerodynamic interferences of aerostatic coefficients of twin decks. The research results have shown that the drag coefficients of the leeward deck are much smaller than that of a single leeward deck. The drag coefficients of a windward deck decrease slightly compared with that of a single deck. The lift and torque coefficients of windward and leeward decks are also affected slightly by the aerodynamic interference of twin decks. And the aerodynamic interference effects on lift and torque coefficients of twin decks can be neglected.

关键词: twin decks     aerodynamic interference effects     aerostatic coefficients     wind tunnel test    

Calculation method of radial stress and deformation on conic threaded connections with interference fit

Shoujun CHEN, Qiang LI, Qi AN,

《机械工程前沿(英文)》 2010年 第5卷 第3期   页码 302-307 doi: 10.1007/s11465-010-0018-9

摘要: This paper presents a calculation method for radial stress distribution and deformation on conic threaded connections with interference fit. Based on elastic mechanics, a new calculation model is established using the thick-walled-cylindrical theory. A sample calculation for API 88.9 mm conic threaded connection indicates that the method proposed in this paper is reasonable, and the finite element analysis (FEA) method is used to validate the proposed method. The results obtained by the proposed method and FEA method are identical. The model offers a new way of calculating the radial stress and deformation on conic thread connections with interference fit.

关键词: conic threaded connections     interference fit     radial stress     deformation     finite element analysis (FEA)    

Design of packing cup interference fit value of hypercompressors for low density polyethylene production

Da LEI,Xuehong LI,Yun LI,Xiwen REN

《能源前沿(英文)》 2019年 第13卷 第1期   页码 107-113 doi: 10.1007/s11708-017-0450-1

摘要: The hypercompressor is one of the core facilities in low density polyethylene production, with a discharge pressure of approximately 300 MPa. A packing cup is the basic unit of cylinder packing, assembled by the interference fit between an inner cup and an outer cup. Because the shrink-fitting prestresses the packing cup, serious design is needed to gain a favorable stress state, for example, a tri-axial compressive stress state. The traditional method of designing the interference fit value for packing cups depends on the shrink-fit theory for thick-walled cylinder subject to internal and external pressure. According to the traditional method, critical points are at the inner radii of the inner and external cup. In this study, the finite element method (FEM) has been implemented to determine a more accurate stress level of packing cups. Different critical points have been found at the edge of lapped sealing surfaces between two adjacent packing cups. The maximum Von Mises equivalent stress in a packing cup increases after a decline with the rise of the interference fit value. The maximum equivalent stress initially occurs at the bore of the inner cup, then at the edge of lapped mating surfaces, and finally at the bore of the outer cup, as the interference radius increases. The traditional method neglects the influence of axial preloading on the interference mating pressure. As a result, it predicts a lower equivalent stress at the bore of the external cup. A higher interference fit value accepted by the traditional method may not be feasible as it might already make packing cups yield at the edge of mating surfaces or the bore of the external cup. Along with fatigue analysis, the feasible range of interference fit value has been modified by utilizing FEM. The modified range tends to be narrower and safer than the one derived from the traditional method, after getting rid of shrink-fit values that could result in yielding in a real packing cup.

关键词: interference fit value     packing cup     hypercompressor     finite element method (FEM)    

Damage propagation and strength prediction of a single-lap interference-fit laminate structure

Peng ZOU, Xiangming CHEN, Hao CHEN, Guanhua XU

《机械工程前沿(英文)》 2020年 第15卷 第4期   页码 558-570 doi: 10.1007/s11465-020-0591-5

摘要: Experimental and finite element research was conducted on the bolted interference fit of a single-lap laminated structure to reveal the damage propagation mechanism and strength change law. A typical single-lap statically loading experiment was performed, and a finite element damage prediction model was built based on intralaminar progress damage theory. The model was programmed with a user subroutine and an interlaminar cohesive zone method. The deformation and damage propagation of the specimen were analyzed, and the failure mechanism of intralaminar and interlaminar damage during loading was discussed. The effect of secondary bending moment on load translation and damage distribution was revealed. The experimental and simulated load–displacement curves were compared to validate the developed model’s reliability, and the ultimate bearing strengths under different fit percentages were predicted. An optimal percentage was also recommended.

关键词: single-lap     interference fit     secondary bending moment     damage mechanism     bearing strength    

Aerodynamic interference effects and mitigation measures on vortex-induced vibrations of two adjacent

Xiaoliang MENG, Ledong ZHU, Zhenshan GUO

《结构与土木工程前沿(英文)》 2011年 第5卷 第4期   页码 510-517 doi: 10.1007/s11709-011-0129-3

摘要: By examining the two neighboring Haihe Bridges with semi- and full-closed bridge decks, the aerodynamic interference between the two decks on the vortex-induced vibration (VIV) and the corresponding aerodynamic mitigation measures are investigated via a series of wind tunnel tests with a spring-suspended sectional model aided with computational fluid dynamics (CFD) method. The results show that the VIV responses of both bridges can be significantly affected by the aerodynamic interference and that the extent of the influence varies with the shapes of the windward and leeward decks. The VIV amplitudes of the windward bridge are often fairly close to those of the single bridge. However, those of the leeward bridge are magnified substantially by aerodynamic interference if the same structural and aerodynamic configurations are adopted for the two bridges. Otherwise, the VIV responses are not significantly increased and may even be reduced by the aerodynamic interference if different configurations are employed for the two bridges. Furthermore, an effective combined measure of adding wind barriers and sharpening the wind fairing noses of the two box decks is presented for mitigating both the vertical and torsional VIV responses of the windward and leeward bridges.

关键词: separated parallel decks     vortex-induced vibration     aerodynamic interference     aerodynamic mitigation measure     semi-closed box deck     full-closed box deck    

Optimal precoding for full-duplex base stations under strongly correlated self-interference channels Article

Jun WANG, Xiao-jie WEN, Chuan HUANG, Chao-jin QING

《信息与电子工程前沿(英文)》 2017年 第18卷 第6期   页码 808-816 doi: 10.1631/FITEE.1700022

摘要: 考虑了包含1个全双工多天线基站、2个半双工单天线移动用户的全双工蜂窝系统,研究了其全双工多天线基站的最优预编码方案。由于全双工多天线基站在同一频段上同时收发数据,其接收来自远端用户的期望信号将会受到来自本地发射天线大功率自干扰信号的严重影响。由于现有自干扰消除技术不能将自干扰信号完全抵消,考虑存在残余自干扰信号的场景,构造了上行传输速率受限的下行传输速率最大化问题,以刻画上述全双工蜂窝系统的可达速率区域。然而,上述问题不是凸优化问题。鉴于此,考虑强相关自干扰信道场景,利用自干扰信道矩阵秩为1的特点,将上述非凸优化问题变换为凸优化问题,并利用凸优化工具对其求解,得到全双工多天线基站的最优预编码方案。最后,通过数值仿真验证了该方案的有效性。

关键词: 线性预编码;全双工;可达速率区域;强相关自干扰信道    

The role of CDK1 siRNA interference in cell cycle and cell apoptosis

Hui XIAO PhD, Ming TIAN MM, Junna GE MM, Xin Wei MD, Zhaoming LI MM, Xiaolan LI MS, Deding TAO PhD, Junbo HU MD, Jianping GONG MD,

《医学前沿(英文)》 2009年 第3卷 第4期   页码 384-389 doi: 10.1007/s11684-009-0070-1

摘要: In the present report, cyclin-dependent kinase1 (CDK1) siRNA was transfected into cells to silence the CDK1 gene expression and study its role in the cell cycle and cell apoptosis. The siRNA targeting CDK1 gene was chemically synthesized and transfected into Hela cells by lipofectamine 2000. The expression levels of CDK1 gene and protein were examined by real-time quantitative polymerase chain reaction (PCR) and Western blot, respectively. The cell cycle was analyzed by using DNA content analysis by flow cytometry. Cell apoptosis was detected by the Annexin V/PI method. The morphological changes of transfected cells were examined under the microscopy by Wright-Giemsa stain. CDK1 gene was successfully silenced by its siRNA, and the CDK1 protein expression level was decreased significantly, especially from 48thh to 60thh after transfection. The DNA content analysis showed that transfection of CDK1 siRNA led to cells accumulating in G/M phase. There was no significant difference in the apoptotic rate between transfected cells and the control cells after transfection of CDK1 siRNA for 48 or 60h. More double nucleus or multinucleus cells could be seen under the microscopy among the transfected cells. The decreased CDK1 expression by siRNA silencing gave rise to cell cycle arrest in G/M phase but did not induce apoptosis.

关键词: cyclin-dependent kinase1     siRNA interference     cell cycle     apoptosis    

Effects of RNA interference targeting angiotensin 1a receptor on blood pressure and cardiac hypertrophy

ZHANG Jingqun, SUN Honglei, MA Yexin, WANG Daowen

《医学前沿(英文)》 2008年 第2卷 第1期   页码 19-24 doi: 10.1007/s11684-008-0005-2

摘要: The aim of this study is to investigate the effects of RNA interference (RNAi) targeting angiotensin 1a receptor (AT1a) on blood pressure and cardiac hypertrophy of rats with renovascular hypertension. Two RNAi plasmids, pAT1a-shRNA1 and pAT1a-shRNA2 each carrying a U6 promoter and an AT1a-specific shRNA-coding template sequence corresponding to the sites 928–946, 978–996 of the mRNA transcript, and a control plasmid pCon carrying a nonspecific shRNA-coding sequence were constructed. Thirty Sprague – Dawley rats with renovascular hypertension (2-kidney 1-clip) were randomly divided into 5 equal groups: Control group (without any intervention), pAT1a-shRNA1, pAT1a-shRNA2, pCon groups (with injection of the corresponding plasmid 4 mg/kg respectively into the tail vein), and valsartan group (30 mg/kg·d by gavage). Three weeks after drug administration, pAT1a-shRNA1, pAT1a-shRNA2 and valsartan respectively resulted in decrease of the tail blood pressure by (15.1 ± 5.4), (16.4 ± 8.4) and (30.6 ± 18.2) mmHg. However, the tail blood pressure increased further by about 25 mmHg in both of pCon and control groups. The carotid artery pressures of pAT1a-shRNA1, pAT1a-shRNA2 and valsartan groups were all significantly lower than those of the control and pCon groups. The ratio of left ventricle weight to body weight (LV/BW) of the rats in pAT1a-shRNA1, pAT1a-shRNA2, and valsartan groups decreased significantly than in the control group ( < 0.01), similar to those of the normal SD rats( > 0.05). Histopathological examination showed that the myocardiocytes were significantly hypertrophic and the basal membrane of the aorta was significantly thickened in the control group and such changes were alleviated in the pAT1a-shRNA1, pAT1a-shRNA2 and valsartan groups. Compared with the control group, pAT1a-shRNA1 and pAT1a-shRNA2 groups had lowered expression of AT1 receptor (in the myocardium and the thoracic aorta (all < 0.01); however, there were no significant differences in expression levels of AT1 receptor in valsartan and the control groups ( > 0.05). We conclude that RNAi targeting AT1a receptor inhibits the development of renovascular hypertension and the accompanying cardiac hypertrophy. RNAi technology may become a new strategy of gene therapy for hypertension.

关键词: therapy     Sprague     administration     cardiac hypertrophy     valsartan    

一种通过循环前缀再利用改善OFDM系统带宽的新型节能ICI消除技术 Article

Sandeep SAROWA, Harmanjeet SINGH, Sunil AGRAWAL, B. S. SOHI

《信息与电子工程前沿(英文)》 2017年 第18卷 第11期   页码 1892-1899 doi: 10.1631/FITEE.1601333

摘要: 然而,多普勒频移和本地振荡器频率同步误差的存在会导致载波间干扰(inter carrier interference, ICI),严重影响了正交频分复用。

关键词: multiplexing     OFDM);快速傅立叶变换(Fast Fourier transform, FFT);循环前缀(cyclic prefix     CP);符号间干扰(inter symbol interference, ISI);载波间干扰(inter carrier interference     ICI);最大似然估计(maximum likelihood estimation     MLE)    

MXene/cellulose nanofiber/nickel alginate film with improved mechanical properties and electromagnetic interference

《化学科学与工程前沿(英文)》 2023年 第17卷 第10期   页码 1460-1469 doi: 10.1007/s11705-023-2335-7

摘要: Electromagnetic interference pollution has raised urgent demand for the development of electromagnetic interference shielding materials. Transition metal carbides (MXenes) with excellent conductivity have shown great potential in electromagnetic interference (EMI) shielding materials, while the poor mechanical strength, flexibility, and structural stability greatly limit their further applications. Here, cellulose nanofibers and sodium alginate are incorporated with MXene nanosheets as flexible matrices to construct strong and flexible mussel-like layered MXene/Cellulose nanofiber/Sodium Alginate composite films, and nickel ions are further introduced to induce metal coordination crosslinking of alginate units. Benefited from the dual-crosslinked network structure of hydrogen bonding and metal coordination, the tensile strength, Young’s modulus, and toughness of the MXene/cellulose nanofiber/nickel alginate composite film are significantly increased. After subsequent reduction by ascorbic acid, excess nickel ions are reduced to nickel nanoparticles and uniformly dispersed within the highly conductive composite film, which further improved its hysteresis loss effect toward the incident electromagnetic waves. Consequently, the MXene/cellulose nanofiber/nickel alginate-Ni composite film presents a considerably enhanced electromagnetic interference shielding effectiveness (47.17 dB) at a very low thickness of 29 μm. This study proposes a feasible dual-crosslinking and subsequent reduction strategy to synergistically enhance the mechanical properties and electromagnetic interference shielding performance of MXene-based composite materials.

关键词: Ti3C2Tx MXene     double crosslinking     mechanical properties     EMI shielding performance    

标题 作者 时间 类型 操作

Elastoplastic frictional contact problem study on interference fits of compressor

ZHANG Hongwu, WU Changhua, LIAO Aihua

期刊论文

Laser interference fabrication of large-area functional periodic structure surface

Lei WANG, Zi-Han WANG, Yan-Hao YU, Hong-Bo SUN

期刊论文

Construction and identification of lentiviral RNA interference vector of rat leptin receptor gene

Zhengjuan LIU, Jie BIAN, Yuchuan WANG, Yongli ZHAO, Dong YAN, Xiaoxia WANG

期刊论文

with multi-walled carbon nanotubes: preparation, characterization, and application for electromagnetic interference

Jian LI,Caichao WAN

期刊论文

Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems

Le YANG, Shuo WANG, Jianghua FENG

期刊论文

Experimental study of aerodynamic interference effects on aerostatic coefficients of twin deck bridges

Zhiwen LIU , Zhengqing CHEN , Gao LIU , Xinpeng SHAO ,

期刊论文

Calculation method of radial stress and deformation on conic threaded connections with interference fit

Shoujun CHEN, Qiang LI, Qi AN,

期刊论文

Design of packing cup interference fit value of hypercompressors for low density polyethylene production

Da LEI,Xuehong LI,Yun LI,Xiwen REN

期刊论文

Damage propagation and strength prediction of a single-lap interference-fit laminate structure

Peng ZOU, Xiangming CHEN, Hao CHEN, Guanhua XU

期刊论文

Aerodynamic interference effects and mitigation measures on vortex-induced vibrations of two adjacent

Xiaoliang MENG, Ledong ZHU, Zhenshan GUO

期刊论文

Optimal precoding for full-duplex base stations under strongly correlated self-interference channels

Jun WANG, Xiao-jie WEN, Chuan HUANG, Chao-jin QING

期刊论文

The role of CDK1 siRNA interference in cell cycle and cell apoptosis

Hui XIAO PhD, Ming TIAN MM, Junna GE MM, Xin Wei MD, Zhaoming LI MM, Xiaolan LI MS, Deding TAO PhD, Junbo HU MD, Jianping GONG MD,

期刊论文

Effects of RNA interference targeting angiotensin 1a receptor on blood pressure and cardiac hypertrophy

ZHANG Jingqun, SUN Honglei, MA Yexin, WANG Daowen

期刊论文

一种通过循环前缀再利用改善OFDM系统带宽的新型节能ICI消除技术

Sandeep SAROWA, Harmanjeet SINGH, Sunil AGRAWAL, B. S. SOHI

期刊论文

MXene/cellulose nanofiber/nickel alginate film with improved mechanical properties and electromagnetic interference

期刊论文