Powering Up

Uganda launches giant China-constructed hydropower plant to bolster its electricity supply,and also assist South Sudan with theirs Ugandans and South Sudanese have had their lives lit up by the steady flow of electricity from a massive hydropower infrastructure project,constructed by one of China’s leading contractors.

Powering Production

China helps to diversify Zambia’s energy output to tackle chronic electricity shortages Innocent Gondwe tries to put up a smile as he uses his welding machine anxiously to finish his work in time in order to get paid,before a scheduled power cut.But he is unable to fully hide the pain in his eyes caused by the frequent power cuts that are a!ecting his business,which solely depends on electricity supply from ZESCO,Zambia’s major power utility company.After dropping out of school,Gondwe went all out to establish himself as an artisan to earn a living in Kalingalinga,one of the slums in Lusaka,Zambia’s capital.

Powering Next-Generation Broadband Networks: ZTE's World-First Flexible, Configurable Router

16 September 2013, Shenzhen--ZTE today unveiled the world＇s first flexible, reconfigurable terabit router that allows customers to build the highest-performance broadband networks. The terabit router supports the deployment of multiple line cards with processing capabilities of 10 Gbps to 1 Tbps. It also supports the deployment of modules that can scale throughput from 200 Gbps to 18 Tbps. For easy installation in a range of environments, the router interfaces are flexible and the component design is loose-coupled. This allows customers to customize networks to their needs and promotes adaptability, consistency, and continuity.

Powering Up

China is transforming the energy infrastructure landscape in Africa with large-sale electrifying projects.

Powering up Ghana

MORE than 1,000 Ghanaians are benefiting directly by way of jobs from a $600 million Sunon Asogli Thermal Power Plant （Ghana） Limited project - a power generating plant established in the Kpone-Tema metropolis, one of the highly industrialized metropolitan areas in Ghana.

Engineering for Inclusion:Empowering Individuals with Physical and Neurological Differences through Engineering Invention,Research,and Development

1.Background The use of engineering tools,design,research,and thinking to create environments and capabilities whereby individuals who are currently under-employed or unemployed due to a physical disability(e.g.,amputation or spinal cord injury)or neurological difference(e.g.,autism)are enabled to become fully productive and employed members of society has been the implicit goal of decades of research at Vanderbilt University and elsewhere.At Vanderbilt University,progress in these areas has been greatly facilitated by the proximity of the School of Engineering to the world-class Vanderbilt University Medical Center and the resulting close collaboration between engineering and medical researchers.

Empowering industries in the digital era

Data management experts met on September 21,2020 in Beijing and online at the 2020 National Big Data Standardization Conference and the 7th plenary meeting of the big data working group of National Information Security Standardization Technical Committee(SAC/TC 28),sharing and exchanging the progress and prospects in the area.

Empowering the Voice: The Reconstruction of Female Discourse from Shakespeare’s Hamlet to Updike’s Gertrude and Claudius

There are abound with the deconstruction of classic works in recent years,among which Updike’s Gertrude and Claudius is undoubtedly an impressive one.Updike completed the antecedent part of Shakespeare’s play Hamlt.Noticeably,this new prequel of Hamlet,from the mindset of female,takes Queen Gertrude as the narrative center and airs Gertrude’s psychological states to break the confinement of female discourse in Shakespeare’s plays.Hinged on Foucault’s theory of power and discourse,this paper attempts to analyze how Updike manifests women’s endeavors to assert preserve and construct their discourse,break the aphasia and even challenge the voice of male authority by elucidating the interactions between Queen Gertrude and other crucial male roles in the full text in order to navigate readers in-depth to scrutinize the changes of women’s social status in different era.

Empowering Voices

Female NPC deputies from ethnic minority groups stand out.China's most significant annual political event,known as the Two Sessions,commenced in Beijing on March 4,bringing together thousands of deputies to the 14th National People's Congress(NPC),the country's top legislature,and members of the 14th Chinese People's Political Consultative Conference(CPPCC)National Committee.

Enhancing the powering ability of triboelectric nanogenerator through output signal’s management strategies

As a new branch of efficient and low-cost mechanical energy conversion technology,triboelectric nanogenerator(TENG)is a potential solution to provide a long-term power supply for the Internet of Things(IoT)sensors and portable electronic devices.However,due to inherent working properties of TENG itself such as extremely high internal impedance,pulse,and alternating current(AC)output,TENG can not directly supply power to loads such as batteries efficiently.Based on these,we describe TENG’s performance from a new perspective of powering ability.It consists of two aspects:the ability to transport charge effectively and the ability to output high power quality current steadily.In order to push forward the developments and applications of TENG,it is necessary to improve its power supply capacity from different perspectives.Fortunately,in recent years,a variety of output signal’s management strategies aiming at effectively managing the generated electricity and significantly improving powering ability of TENG have obtained significantly progress.Herein,this paper discusses the working mechanisms and different load characteristics of TENG at first to clarify the electric performance of TENG.Then,on basis of theoretical analysis,the output signal’s management strategies are elaborated from four aspects:improving the cycle output electricity of TENG,increasing the surface charge density of TENG,improving the power quality of TENG-based energy harvesting system,promoting the application of TENG through integrated circuit(IC)technology and TENG network,and the relevant principles and applications are discussed systematically.Finally,the advantages and disadvantages of the above output signal’s management strategies are summarized and discussed,and the future development of the output signal’s management strategies for TENG is prospected.

Analysis and optimization of batteries powering inductive pulsed power supplies

Inductive pulsed power supply(IPPS)is a promising type of power supplies for electromagnetic launch,but its advantage in energy density is strongly restricted by the primary power source.Fortunately,batteries become a suitable and practical choice for the primary source.In this paper,the working process of battery powering IPPS is analysed in detail.Various indicators of the charging performance are calculated,which are then proved to be irrelevant to most of the parameters of IPPS.Based on this,an optimization method for battery and IPPS system is proposed,in which the charging and discharging processes can be decoupled.And for the decoupled battery charging process,the bi-objective optimization model is suggested.Several examples illustrate the feasibility and effectiveness of the proposed optimization methods.In order to further improve the performance of the battery and IPPS system,the inherent time constant of the inductors and the output power density of the battery cell should be increased.

ICU患者置入Power PICC导管特殊异位原因分析

目的:探讨ICU患者置入Power PICC导管后头端反折向上至同侧和对侧锁骨下静脉、头臂静脉等特殊异位的相关因素。方法:回顾性分析2021年9月至2022年9月某三甲医院ICU 520例PICC置管患者,通过胸部X线确定PICC导管头端反折向上至对侧和同侧锁骨下静脉、头臂静脉的患者,分析其特殊异位发生因素。结果:胸部X线结果显示25例患者PICC管头端反折向上异位至对侧和同侧锁骨下静脉、头臂静脉或颈内静脉,异位发生率4.8%,不同静脉置管反折异位发生率相比差异无统计学意义,P>0.05。结论:ICU患者PICC置入发生导管头端反折向上至同侧和对侧锁骨下静脉、头臂静脉等特殊异位的发生因素较多,包括同时留置CVC或血透管、正在滴注或泵入多种药物、PICC管头端异位的隐匿性、导管材质、自身疾病及机械通气等危险因素。

基于调和概率语言术语集的Power平均算子

实践发现现存概率语言Power平均算子在应用中存在概率信息丢失、计算过于繁琐等问题,针对这些问题,提出一种基于调和概率语言术语集的Power平均算子。结合新的基本运算法则与新的支撑度,给出新的概率语言Power平均算子、概率语言Power几何平均算子、概率语言Power加权平均算子、概率语言Power加权几何平均算子,同时论证分析了这几类新型算子的性质。最后通过实验数据,将提出的算子与现存算子进行对比分析,验证了所提算子的有效性与可行性。

A Novel Multiple DBC-staked units Package to Parallel More Chips for SiC Power Module

Silicon carbide(SiC) power modules play an essential role in the electric vehicle drive system. To improve their performance, reduce their size, and increase production efficiency, this paper proposes a multiple staked direct bonded copper(DBC) unit based power module packaging method to parallel more chips. This method utilizes mutual inductance cancellation effect to reduce parasitic inductance. Because the conduction area in the new package is doubled, the overall area of power module can be reduced. Entire power module is divided into smaller units to enhance manufacture yield, and improve design freedom. This paper provides a detailed design, analysis and fabrication procedure for the proposed package structure. Additionally, this paper offers several feasible solutions for the connection between power terminals and DBC untis. With the structure, 18dies were paralleled for each phase-leg in a econodual size power module. Both simulation and double pulse test results demonstrate that, compared to conventional layouts, the proposed package method has 74.8% smaller parasitic inductance and 34.9% lower footprint.

Frequency Domain Fatigue Evaluation on SCR Girth-Weld Based on Structural Stress

The Steel Catenary Riser(SCR)is a vital component for transporting oil and gas from the seabed to the floating platform.The harsh environmental conditions and complex platform motion make the SCR’s girth-weld prone to fatigue failure.The structural stress fatigue theory and Master S-N curve method provide accurate predictions for the fatigue damage on the welded joints,which demonstrate significant potential and compatibility in multi-axial and random fatigue evaluation.Here,we propose a new frequency fatigue model subjected to welded joints of SCR under multiaxial stress,which fully integrates the mesh-insensitive structural stress and frequency domain random process and transforms the conventional welding fatigue technique of SCR into a spectrum analysis technique utilizing structural stress.Besides,a full-scale FE model of SCR with welds is established to obtain the modal structural stress of the girth weld and the frequency response function(FRF)of modal coordinate,and a biaxial fatigue evaluation about the girth weld of the SCR can be achieved by taking the effects of multi-load correlation and pipe-soil interaction into account.The research results indicate that the frequency-domain fatigue results are aligned with the time-domain results,meeting the fatigue evaluation requirements of the SCR.

大传输距离下电动汽车无线充电系统优化

针对无线充电系统原边线圈嵌入路面结构后耦合线圈之间的距离增大、耦合程度减弱的问题,对线圈结构进行优化,以实现大传输距离下无线电能的传输。通过电磁有限元仿真对线圈的内径、外径和匝数进行优化,提出以耦合系数为优化目标的线圈结构参数优化流程,同时,在Simulink中搭建无线充电系统的电路仿真平台,对采用优化后线圈结构的无线充电系统性能进行测试。结果表明:随着线圈内径增大,耦合系数先增大,达到峰值后迅速减小;随着线圈外径增大,耦合系数逐渐增大;在不同外径下,线圈的最优匝数均为9匝;3个参数中,增大外径是提高线圈耦合程度最有效的方式;最终优化后线圈的参数为外径480 mm、内径210 mm、匝数9匝,可以实现300 mm距离的电能传输,系统输出功率保持在2.96~3.70 kW,传输效率达到86.54%,横向容许偏移距离可达60 mm。

Exergy-energy analysis of full repowering of a steam power plant

A 320 MW old steam power plant has been chosen for repowering in this paper. Considering the technical conditions and working life of the power plant, the full repowering method has been selected from different repowering methods. The power plant repower- ing has been analyzed for three different feed water flow rates： a flow rate equal to the flow rate at the condenser exit in the original plant when it works at nominal load, a flow rate at maximum load, and a flow rate when all the extractions are blocked. For each flow rates, two types of gas turbines have been examined： V94.2 and V94.3A. The effect of a duct burner has then been investigated in each of the above six cases. Steam is produced by a double- pressure heat recovery steam generator （HRSG） with reheat which obtains its required heat from the exhaust gases coming from the gas turbines. The results obtained from modeling and analyzing the energy-exergy of the original steam power plant and the repowered power plant indicate that the maximum efficiency of the repowered power plant is 52.04%. This maximum efficiency occurs when utilizing two V94.3A gas turbines without duct burner in the steam flow rate of the nominal load.

A Tutorial Review of the Solar Power Curve: Regressions, Model Chains, and Their Hybridization and Probabilistic Extensions

Owing to the persisting hype in pushing toward global carbon neutrality,the study scope of atmospheric science is rapidly expanding.Among numerous trending topics,energy meteorology has been attracting the most attention hitherto.One essential skill of solar energy meteorologists is solar power curve modeling,which seeks to map irradiance and auxiliary weather variables to solar power,by statistical and/or physical means.In this regard,this tutorial review aims to deliver a complete overview of those fundamental scientific and engineering principles pertaining to the solar power curve.Solar power curves can be modeled in two primary ways,one of regression and the other of model chain.Both classes of modeling approaches,alongside their hybridization and probabilistic extensions,which allow accuracy improvement and uncertainty quantification,are scrutinized and contrasted thoroughly in this review.

Traction power systems for electrified railways:evolution,state of the art,and future trends

Traction power systems(TPSs)play a vital role in the operation of electrified railways.The transformation of conventional railway TPSs to novel structures is not only a trend to promote the development of electrified railways toward high-efficiency and resilience but also an inevitable requirement to achieve carbon neutrality target.On the basis of sorting out the power supply structures of conventional AC and DC modes,this paper first reviews the characteristics of the existing TPSs,such as weak power supply flexibility and low-energy efficiency.Furthermore,the power supply structures of various TPSs for future electrified railways are described in detail,which satisfy longer distance,low-carbon,high-efficiency,high-reliability and high-quality power supply requirements.Meanwhile,the application prospects of different traction modes are discussed from both technical and economic aspects.Eventually,this paper introduces the research progress of mixed-system electrified railways and traction power supply technologies without catenary system,speculates on the future development trends and challenges of TPSs and predicts that TPSs will be based on the continuous power supply mode,employing power electronic equipment and intelligent information technology to construct a railway comprehensive energy system with renewable energy.

Carbon emission reduction:Contribution of photovoltaic power and practice in China

As a clean and renewable form of energy,photovoltaic(PV)power generation converts solar energy into electrical energy,reducing the consumption of fossil fuels and significantly lowering greenhouse gas emissions.Amidst the global transition towards cleaner forms of energy,countries all around the world are vigorously developing PV technology.