Innovative Techniques Unveiled in Advanced Sheet Pile Curtain Design

This thorough review explores the complexities of geotechnical engineering, emphasizing soil-structure interaction (SSI). The investigation centers on sheet pile design, examining two primary methodologies: Limit Equilibrium Methods (LEM) and Soil-Structure Interaction Methods (SSIM). While LEM methods, grounded in classical principles, provide valuable insights for preliminary design considerations, they may encounter limitations in addressing real-world complexities. In contrast, SSIM methods, including the SSI-SR approach, introduce precision and depth to the field. By employing numerical techniques such as Finite Element (FE) and Finite Difference (FD) analyses, these methods enable engineers to navigate the dynamics of soil-structure interaction. The exploration extends to SSI-FE, highlighting its essential role in civil engineering. By integrating Finite Element analysis with considerations for soil-structure interaction, the SSI-FE method offers a holistic understanding of how structures dynamically interact with their geotechnical environment. Throughout this exploration, the study dissects critical components governing SSIM methods, providing engineers with tools to navigate the intricate landscape of geotechnical design. The study acknowledges the significance of the Mohr-Coulomb constitutive model while recognizing its limitations, and guiding practitioners toward informed decision-making in geotechnical analyses. As the article concludes, it underscores the importance of continuous learning and innovation for the future of geotechnical engineering. With advancing technology and an evolving understanding of soil-structure interaction, the study remains committed to ensuring the safety, stability, and efficiency of geotechnical structures through cutting-edge design and analysis techniques.

Holographic alloy positioning design system and holographic network phase diagrams of Au-Cu system

Taking Au?Cu system as an example, three discoveries and two methods were presented. First, a new way for boosting sustainable progress of systematic metal materials science (SMMS) and alloy gene engineering (AGE) is to establish holographic alloy positioning design (HAPD) system, of which the base consists of measurement and calculation center, SMMS center, AGE center, HAPD information center and HAPD cybernation center; Second, the resonance activating-sychro alternating mechanism of atom movement may be divided into the located and oriented diffuse modes; Third, the equilibrium and subequilibrium holographic network phase diagrams are blueprints and operable platform for researchers to discover, design, manufacture and deploy advanced alloys, which are obtained respectively by the equilibrium lever numerical method and cross point numerical method of isothermal Gibbs energy curves. As clicking each network point, the holographic information of three structure levels for the designed alloy may be readily obtained: the phase constitution and fraction, phase arranging structure and properties of organization; the composition, alloy gene arranging structure and properties of each phase and the electronic structures and properties of alloy genes. It will create a new era for network designing advanced alloys.

Circular Ribbon Antenna Array Design For Imaging Application

Our goal is to develop THz module on chip to visualize bone grinding at the early stage so that arthritis can be visualized and treated early.A critical component of such module is antenna.A compact 4 by 4 beamforming antenna array for biomedical application is presented in this paper.We are proposing a novel antenna which is in the form of a circular ribbon shape with a gold patch.Gold material for the patch is used to enhance its conductivity and to cut down backward radiation.Differential port pin used to increase the bandwidth.Au-posts are finally used for output connection.The proposed antenna operates over the frequency band from 201 GHz to more than 228 GHz.Directivity and gain of the proposed antenna are 13 dB and 7 dB respectively.This makes it applicable for imaging systems because of the frequency band for biomedical imaging.Index Terms-Beamforming antenna,antenna array,Advanced design system(ADS),Biomedical imaging.

Design of a 5.305 GHz Dielectric Resonator Oscillator with Simulation and Optimization

The design of a 5.305 GHz series feedback free running dielectric resonator oscillator （DRO） is presented. Its simulation and optimization are realized by obtaining the unloaded Q factor of the cavity dielectric resonator （DR） and analyzing the linear and nonlinear models of the DRO. CAD packages of DR_Rez and Agilent Advance Design System （ADS） are used and the best tradeoff among the output power, phase noise, and frequency stability is achieved. With the result of simulation, a physical oscillator prototype is constructed. The measured results show the good agreement with those of simulation.

基于TwinCAT与C++的光谱数据传输系统

为实现DCS(Distributed Control System)控制系统与在线傅里叶红外光谱仪之间的高速、准确通讯,根据工业现场的需求,设计采用倍福公司的CX8090嵌入式控制器及数字输入模块、Modbus通讯模块实现数据实时传输。在该系统中TwinCAT做主站,DCS为从站,分析了基于C++与TwinCAT之间的通讯、实现数据交互的原理及实现的方法。实验结果表明,该系统能够准确可靠、快速地完成数据的传输。

A PHEMT Based Wideband LNA for Wireless Applications

This work is about the development of a super low noise amplifier with minimum power consumption and high gain for several wireless applications.The amplifier operates at frequency bands of 0.9-2.4 GHz and can be used in many applications like Wireless local area network(WLAN),WiFi,Bluetooth,ZigBee and Global System for mobile communications(GSM).This new design can be employed for the IEEE 802.15.4 standard in industrial,scientific and medical(ISM) Band.The enhancement mode pseudomorphic high electron mobility transistor PHEMT is used here due to its high linearity,better performance and less noisy operation.The common source inductive degeneration method is employed here to enhance the gain of amplifier.The amplifier produces a gain of more than 17 dB and noise figure of about 0.5 dB.The lower values of S11 and S22 reflect the accuracy of impedance matching network placed at the input and output sides of amplifier.Agilent Advance Design System(ADS) is used for the design and simulation purpose.Further the layout of design is developed on the FR4 substrate.

A New Fuzzy Controlled Antenna Network Proposal for Small Satellite Applications

This research contributes to small satellite system development based on electromagnetic modeling and an integrated meta-materials antenna networks design for multimedia transmission contents.It includes an adaptive nonsingular mode tracking control design for small satellites systems using fuzzy waveless antenna networks.By analyzing and modeling based on electromagnetic methods,propagation properties of guided waves from metallic structures with simple or complex forms charge partially or entirely by anisotropic materials such as metamaterials.We propose a system control rule to omit uncertainties,including the inevitable approximation errors resulting from the finite number of fuzzy signal power value basis functions in antenna networks.Moreover,both the stability and the tracking performance of the closed-loop robotic system are experimentally validated.The research lies within the scope of the improvement of speed,effectiveness,and precision of numerical methods applied to electro-magnetic modeling with complex structures,essentially rectangular metallic waveguides filled with isotropic or anisotropic metamaterials.Three axes of our research are presented:waveguides,filters,and antennas.The proposed controller does not require prior knowledge about the dynamics of the fuzzy system controller for antenna networks or the offline learning phase.In addition,this work contributes to solving the problem of non-visibility stations to ensure data transmission in wireless networks.The proposed solution maximizes inter-connection by using a fuzzy controlled antenna network,and the novelty guarantees nonlimited interconnection in wireless networks compared to traditional methods.

X-Band Power Amplifier for Next Generation Networks Based on MESFET

Advanced wireless standards of communication like 3GPP and LTE are becoming more and more efficient and with this evolution of communication systems mobile equipment is also become smaller and smaller. Power amplifier designing has become a very crucial task in this era where efficiency and size are the main concern of any designer. In this paper we have design and analyzed X-band Class E Metal-semiconductor field effect transistor(MESFET) based Power Amplifier. This device targets the devices which use OFDM technique to improve their spectral efficiency for the next generation communication systems. Microstrip lines are used to achieve small size for our design instead of lumped components. Load Pull measurements are used to get MESFET input and output impedances optimum values. For linear and non linear operation small signal mathematical model of the design is used. To reduce thermal losses FR4 substrate is used to increase PA efficiency. Our designs shows small values of input and output return loss of about-22.3d B and-23.716 d B achieving a high gain of about25.6 d B respectively, with PAE of about 30 % having stability factor greater than 1 and 21.894 d Bm of output power.

Design of MMIC oscillators using GaAs 0.2 μm PHEMT technology

We propose a feedback type oscillator and two negative resistance oscillators.These microwave oscillators have been designed in the S band frequency.A relatively symmetric resonator is used in the feedback type oscillator.The first negative resistance oscillator uses a simple lumped element resonator which is substituted by a microstrip resonator in the second oscillator to improve results.The negative resistance oscillator produces 4.207 dBm and 7.124 dBm output power with the lumped element resonator and microstrip resonator respectively,and the feedback type oscillator produces ?10.707 dBm output power.The feedback type oscillator operates at 3 GHz with phase noise levels at-83.30 dBc/Hz and-103.3 dBc/Hz at 100 kHz and 1 MHz offset frequencies respectively.The phase noise levels of the negative resistance oscillator with the lumped element resonator are-94.64 dBc/Hz and-116 dBc/Hz at 100 kHz and 1 MHz offset frequencies respectively,at an oscillation frequency of 3.053 GHz.With the microstrip resonator the phase noise levels are-99.49 dBc/Hz and-119.641 dBc/Hz at 100 kHz and 1 MHz offset frequencies respectively,at an oscillation frequency of 3.072 GHz.The results showed that both the output power and the phase noise of the negative resistance oscillators were better than those of the feedback type oscillator.

Advanced Design of Fibrous Flexible Actuators for Smart Wearable Applications

Smart wearables equipped with integrated flexible actuators possess the ability to autonomously respond and adapt to changes in the environment.Fibrous textiles have been recognised as promising platforms for integrating flexible actuators and wearables owing to their superior body compliance,lightweight nature,and programmable architectures.Various studies related to textile actuators in smart wearables have been recently reported.However,the review focusing on the advanced design of these textile actuator technologies for smart wearables is lacking.Herein,a timely and thorough review of the progress achieved in this field over the past five years is presented.This review focuses on the advanced design concepts for textile actuators in smart wearables,covering functional materials,innovative architecture configurations,external stimuli,and their applications in smart wearables.The primary aspects focus on actuating materials,formation techniques of textile architecture,actuating behaviour and performance metrics of textile actuators,various applications in smart wearables,and the design challenges for next-generation smart wearables.Ultimately,conclusive perspectives are highlighted.

An AES chip with DPA resistance using hardware-based random order execution

This paper presents an AES（advanced encryption standard） chip that combats differential power analysis （DPA） side-channel attack through hardware-based random order execution.Both decryption and encryption procedures of an AES are implemented on the chip.A fine-grained dataflow architecture is proposed,which dynamically exploits intrinsic byte-level independence in the algorithm.A novel circuit called an HMF（Hold-MatchFetch） unit is proposed for random control,which randomly sets execution orders for concurrent operations.The AES chip was manufactured in SMIC 0.18μm technology.The average energy for encrypting one group of plain texts（128 bits secrete keys） is 19 nJ.The core area is 0.43 mm^2.A sophisticated experimental setup was built to test the DPA resistance.Measurement-based experimental results show that one byte of a secret key cannot be disclosed from our chip under random mode after 64000 power traces were used in the DPA attack.Compared with the corresponding fixed order execution,the hardware based random order execution is improved by at least 21 times the DPA resistance.