Search | Engineering

订阅投稿

首页工程期刊工程焦点工程成就工程前沿关于我们 English

资源类型

期刊论文 4355

会议视频 391

会议信息 11

会议专题 1

年份

2024 20

2023 371

2022 454

2021 553

2020 305

2019 292

2018 231

2017 268

2016 193

2015 142

2014 125

2013 83

2012 107

2011 106

2010 114

2009 133

2008 141

2007 168

2006 142

2005 147

展开︾

关键词

智能制造 52

人工智能 40

能源 37

可持续发展 35

农业科学 33

医学 27

增材制造 24

工程管理 22

绿色化工 21

信息技术 20

机器学习 20

神经网络 19

遗传算法 18

创新 16

数值模拟 15

环境 15

发展 14

管理 14

优化 13

展开︾

检索范围：

排序：展示方式：

用高光谱发光法研究Cu(In_x,Ga_1–x)Se₂ (CIGS)模块中由P1引起的功率损耗的成因 Article

César Omar Ramírez Quiroz, Laura-Isabelle Dion-Bertrand, Christoph J. Brabec, Joachim Müller, Kay Orgassa

《工程（英文）》 2020年第6卷第12期页码 1395-1402 doi: 10.1016/j.eng.2019.12.019

摘要： <p style="text-align: justify;">在本文中，我们利用了高光谱高分辨率光致发光映射技术，这是一个强大的工具，可用于选择和优化在Cu(In_x,Ga_1-x)Se₂（CIGS）模块上对子电池进行图案化互连的激光烧蚀工艺。通过这种方式，我们可以完成对消融区域附近材料降解的深度监测以及对潜在机制的识别。具体而言，通过分析在CIGS沉积之前烧蚀的标准P1图案线，我们发现了沿着下部的钼槽边缘的异常发射猝灭效应。通过扫描电子显微镜（SEM）比较了P1边缘的横截面的形貌，我们进一步合理化产生这种效应的起因，但无法用厚度变化解释光发射的减少。我们还研究了激光诱导对CIGS沉积后的P1图案线带来的损伤。然后，我们首次记录了短距离损坏区域，该区域与在激光路径上应用的光学孔径无关。我们的发现能更好地理解P1引起的功率损耗，并为改进与行业相关的模块互连方案提供了新的见解。p>

关键词： Cu(Inx Ga1–x)Se2 电池到模块的效率差距由P1引起的功率损耗高光谱光致发光激光烧蚀短程热效应

HTML PDF 收藏

一种扩展非对称Doherty功率放大器输出功率回退范围的新方法 Research Article

李明玉1,程小兵1,代志江1,钟康1,蔡天赋1,黄超意2

《信息与电子工程前沿（英文）》 2023年第24卷第3期页码 470-479 doi: 10.1631/FITEE.2200250

摘要：提出一种扩展Doherty功率放大器（DPA）输出功率回退（OPBO）范围的新方法。研究表明，可以通过峰值路功放的输出阻抗来调整和改变载波功率放大器输出匹配网络的相位，来扩大DPA的输出功率回退量。基于此理论，设计了一个工作频带为1.55—2.2 GHz（35%相对带宽）、具有大输出功率回退范围的高效率非对称DPA，通过这一例子来验证所提方法的有效性。

关键词： Doherty功率放大器；输出功率回退；输出阻抗；网络相位

HTML PDF 收藏

一种面向恒流输电水下观测网的无级功率重构转换器 Research Article

臧玉嘉1,2,陈燕虎1,杨灿军1,张浩宇1,段志勇1,Gul MUHAMMAD1

《信息与电子工程前沿（英文）》 2021年第22卷第12期页码 1551-1684 doi: 10.1631/FITEE.2100259

摘要：恒流（CC）电能到恒压（CV）电能的转换是恒流输电水下观测网的关键技术之一。该系统通常采用具有高稳定性和高可靠性的并联稳压器以稳定输出电压。然而，并联稳压方法存在高热损耗和低转换效率的缺点。本文对传统并联稳压方法进行改进，提出一种CC/CV转换模块的无级功率重构方法。针对稳定负载或缓慢变化负载的应用场景，介绍两种无级功率重构转换模式：（1）基于单环控制的手动无级功率重构（MSPR）；（2）基于内—外环控制的自动无级功率重构（ASPR）。所述方法在保证系统留有预设功率裕度的同时，可以尽可能减少并联稳压方法中不必要的能量损失。分析了该方法的转换效率，讨论了系统关键参数选择方法。实验结果表明，MSPR和ASPR方法均保留了并联稳压方法的高稳定优点，同时降低了CC/CV转换模块的热耗散，提高了CC/CV转换效率。

关键词：恒流/恒压转换；并联稳压器；无级功率重构；水下观测网

HTML PDF 收藏

朱秋明1,2,姚梦恬1,柏菲1,陈小敏1,仲伟志3,华博宇1,叶溪娟1

《信息与电子工程前沿（英文）》 2021年第22卷第6期页码 767-776 doi: 10.1631/FITEE.2000497

摘要：提出一种通用的空地毫米波传播损耗模型。与现有传播损耗模型不同，本模型考虑了无人机高度因素，并将传播类型分为3种情况（视距、反射和绕射）。同时，提出一种结合射线追踪技术和数字地图的确定性传播损耗预测算法，并用于不同场景下生成大量数据。通过拟合分析不同场景和无人机高度下的传播损耗数据，得到与高度相关的模型参数。仿真结果表明，所提模型在低空和高空情况下都能准确预测传播损耗。相比3GPP模型和CI模型，所提模型的预测结果与射线追踪计算结果更加一致，标准偏差更小。

关键词：传播损耗；无人机对地信道；毫米波通信信道；射线追踪；高度相关

HTML PDF 收藏

Probes and nano-delivery systems targeting NAD(P)H:quinone oxidoreductase 1: a mini-review

《化学科学与工程前沿（英文）》 2023年第17卷第2期页码 123-138 doi: 10.1007/s11705-022-2194-7

摘要： The two-electron cytoplasmic reductase NAD(P)H:quinone oxidoreductase 1 is expressed in many tissues. NAD(P)H:quinone oxidoreductase 1 is well-known for being highly expressed in most cancers. Therefore, it could be a target for cancer therapy. Because it is a quinone reductase, many bioimaging probes based on quinone structures target NAD(P)H:quinone oxidoreductase 1 to diagnose tumours. Its expression is higher in tumours than in normal tissues, and using target drugs such as β-lapachone to reduce side effects in normal tissues can help. However, the physicochemical properties of β-lapachone limit its application. The problem can be solved by using nanosystems to deliver β-lapachone. This mini-review summarizes quinone-based fluorescent, near-infrared and two-photon fluorescent probes, as well as nanosystems for delivering the NAD(P)H:quinone oxidoreductase 1-activating drug β-lapachone. This review provides valuable information for the future development of probes and nano-delivery systems that target NAD(P)H:quinone oxidoreductase 1.

关键词： NAD(P)H:quinone oxidoreductase 1 cancer therapy target probe nanosystem

HTML PDF 收藏

心电图信号的频域分析

涂承媛,曾衍钧,李树信

《中国工程科学》 2002年第4卷第12期页码 66-70

摘要： <p>提出了一种简便有效的、由心电图（ECG）曲线提取QRS-T复合波的新方法，从而获得P波（当房颤未发生时）或f波（当房颤时）；利用功率谱、自相关、互相关等信号处理技术，对它进行了处理和分析，特别是，比较了未房颤时和发生房颤时的相关信息的显著差别。p>

关键词：心电图（ECG） QRS-T复合波 P波房颤波（f波）频数直方图功率谱自相关互相关

HTML PDF 收藏

noncoding RNA LOC646029 functions as a ceRNA to suppress ovarian cancer progression through the miR-627-3p/SPRED1 axis

《医学前沿（英文）》页码 924-938 doi: 10.1007/s11684-023-1004-z

摘要： Long noncoding RNAs (lncRNAs) play a crucial regulatory role in the development and progression of multiple cancers. However, the potential mechanism by which lncRNAs affect the recurrence and metastasis of ovarian cancer remains unclear. In the current study, the lncRNA LOC646029 was markedly downregulated in metastatic ovarian tumors compared with primary tumors. Gain- and loss-of-function assays demonstrated that LOC646029 inhibits the proliferation, invasiveness, and metastasis of ovarian cancer cells in vivo and in vitro. Moreover, the downregulation of LOC646029 in metastatic ovarian tumors was strongly correlated with poor prognosis. Mechanistically, LOC646029 served as a miR-627-3p sponge to promote the expression of Sprouty-related EVH1 domain-containing protein 1, which is necessary for suppressing tumor metastasis and inhibiting KRAS signaling. Collectively, our results demonstrated that LOC646029 is involved in the progression and metastasis of ovarian cancer, which may be a potential prognostic biomarker.

关键词： ovarian cancer lncRNA LOC646029 metastasis microRNA 627-3p SPRED1

HTML PDF 收藏

车地通信中定向毫米波传播的实证研究

刘希晨,杨霖,余代中

《信息与电子工程前沿（英文）》 2021年第22卷第4期页码 503-516 doi: 10.1631/FITEE.2000464

摘要：随着对高速移动通信日渐增长的需求，人们迫切需要高速车载通信系统。毫米波频段由于其较广的带宽和丰富的频率资源而受到越来越多的关注。然而毫米波通信系统的设计高度依赖于各种环境下的无线信道特性；因此，有必要对不同场景下毫米波信道进行研究。现有的对于长距离传输中毫米波的通信信道特性的研究较为缺乏。41 GHz毫米波通信信道收发器数字基带由模数转换器AD6688、数模转换器AD9163、两个XC7VX690T FPGA和ZYNQ7045芯片组成，在接收机的射频前端使用AD8362芯片记录RSSI值采用高增益10°半功率波束宽度(HPBW)的定向喇叭天线。利用天线增益高的优点，毫米波探测器能够在长距离传播引起的高信号衰减后检测到毫米波信号。提出一种更为通用的功率延迟分布（PDP）模型，称为两段指数模型，将功率延迟分布曲线分为两段。两段指数模型涵盖了一段指数模型的所有适用情况，并且可以解决噪底的问题。

关键词：毫米波；两径模型；均方根时延扩展；功率延迟分布；CI-TRH路径损耗模型

HTML PDF 收藏

17–26.5 GHz 42.5 dBm宽带高效率GaN功率放大器设计 Correspondences

黎明1,2,李智群1,3,郑权2,蔺兰峰2,陶洪琪2

《信息与电子工程前沿（英文）》 2022年第23卷第2期页码 346-350 doi: 10.1631/FITEE.2000513

摘要：提出一种在微波频段具有宽带、高效率的氮化镓（GaN）功率放大器。该功率放大器采用0.15 μm栅长GaN-HEMT工艺，其工作频段可以覆盖整个K频段，即17–26.5 GHz。为获得更好的输出功率和功率附加效率（PAE），根据晶体管的性能，设计了最优前后级驱动比和最佳晶体管尺寸，并采用宽带低损耗电路拓扑结构，实现宽带高效率设计。同时，将谐波控制结构巧妙地集成到驱动级匹配电路中，提升高频效率，确保整个频段内获得较高功率附加效率。该功率放大器采用三级放大拓扑结构，在连续波条件下，测试结果表明，在17–26.5 GHz频带范围内饱和输出功率超过42.5 dBm，平均PAE为30%，在19.8 GHz时PAE达到最大，为32.1%，输出功率平坦度优于1.0 dB。

关键词： K波段；高效率；宽带；氮化镓（GaN）；功率放大器

HTML PDF 收藏

多目标存在的多基地MIMO组网雷达与多干扰机之间的超模干扰抑制博弈 Research Article

赫彬1,2,苏洪涛1

《信息与电子工程前沿（英文）》 2022年第23卷第4期页码 617-629 doi: 10.1631/FITEE.2000652

摘要：为应对新一代电子战的威胁，本文建立一种非合作对抗博弈模型，分析了多基地多入多出（MIMO）雷达与多干扰机之间的功率分配和干扰抑制问题。首先，根据功率分配策略，构造了一种具有固定权矢量的超模功率分配博弈框架。同时，建立了一种极大化雷达效用函数的约束优化模型。基于效用函数，分别得到雷达和干扰机的最佳功率分配策略，并证明该超模博弈的纳什均衡的存在性和唯一性。然后，提出一种具有固定权矢量的超模博弈算法，该算法收敛于博弈的纳什均衡。此外，采用自适应波束形成方法抑制互通道干扰，如干扰机到雷达的直达波干扰。为抑制这些干扰，提出一种联合功率分配和波束形成的超模博弈算法。该算法在保证最佳功率分配的同时，提高了MIMO雷达的干扰抑制能力。最后通过数值结果验证了两种算法的优越性和收敛性。

关键词：超模博弈；功率分配；波束形成；多入多出雷达；多干扰机

HTML PDF 收藏

Synthesis of zeolite Na-P1 from coal fly ash produced by gasification and its application as adsorbent

Yixin Zhang, Lu Zhou, Liqing Chen, Yang Guo, Fanhui Guo, Jianjun Wu, Baiqian Dai

《化学科学与工程前沿（英文）》 2021年第15卷第3期页码 518-527 doi: 10.1007/s11705-020-1926-9

摘要： The coal fly ash produced by gasification is estimated to be over 80 million ton per year in China by 2021. It has mainly been disposed as solid waste by landfill. There is lack of study focused on its utilization. In this paper, the coal fly ash produced by gasification was at first analyzed and then applied to synthesize zeolite as an adsorbent. The effects of synthesis conditions on the cation exchange capacity (CEC) of zeolite were investigated. The results from X-ray diffraction and scanning electron microscope indicated that the crystallinity of the synthesized zeolite is the most important factor to affect the CEC. When the synthesized zeolite with the highest CEC (275.5 meq/100 g) was used for the adsorption of Cr(VI) from aqueous solution, the maximum adsorption capacity for Cr(VI) was found to be 17.924 mg/g. The effects of pH, contact time and initial concentration on the adsorption of Cr(VI) were also investigated. The adsorption kinetics and isotherms can be well described by the pseudo-second-order model and Langmuir isotherm model, respectively.

关键词： coal fly ash gasification zeolite Na-P1 chromium(VI)

HTML PDF 收藏

PAK1 is a novel cardiac protective signaling molecule

null

《医学前沿（英文）》 2014年第8卷第4期页码 399-403 doi: 10.1007/s11684-014-0380-9

摘要：

We review here the novel cardiac protective effects of the multifunctional enzyme, p21-activated kinase 1 (PAK1), a member of a serine/threonine protein kinase family. Despite the large body of evidence from studies in noncardiac tissue indicating that PAK1 activity is key in the regulation of a number of cellular functions, the role of PAK1 in the heart has only been revealed over the past few years. In this review, we assemble an overview of the recent findings on PAK1 signaling in the heart, particularly its cardiac protective effects. We present a model for PAK1 signaling that provides a mechanism for specifically affecting cardiac cellular processes in which regulation of protein phosphorylation states by protein phosphatase 2A (PP2A) predominates. We discuss the anti-adrenergic and antihypertrophic cardiac protective effects of PAK1, as well as its role in maintaining ventricular Ca²⁺ homeostasis and electrophysiological stability under physiological, β-adrenergic and hypertrophic stress conditions.

关键词： p21-activated kinase 1 (PAK1) heart

HTML PDF 收藏

未来的外科医生将与机器人医生一起协作

Marcus Woo

《工程（英文）》 2020年第6卷第4期页码 379-380 doi: 10.1016/j.eng.2020.02.002

HTML PDF 收藏

Clinical characteristics and prognostic values of 1p32.3 deletion detected through fluorescence

Huanping Wang, Haitao Meng, Jinghan Wang, Yinjun Lou, Yile Zhou, Peipei Lin, Fenglin Li, Lin Liu, Huan Xu, Min Yang, Jie Jin

《医学前沿（英文）》 2020年第14卷第3期页码 327-334 doi: 10.1007/s11684-019-0712-x

摘要： This study aimed to investigate the prevalence, clinical characteristics, and prognostic impact of 1p32.3 deletion in patients with newly diagnosed multiple myeloma (MM). A retrospective analysis was conducted on 411 patients with newly diagnosed MM; among which, 270 received bortezomib-based therapies, and 141 received thalidomide-based therapies. Fluorescence hybridization (FISH) was performed to detect six cytogenetic abnormalities, namely, del(1p32.3), gain(1q21), del(17p13), del(13q14), t(4;14), and t(11;14). Results showed that 8.3% of patients with MM were detected with del(1p32.3) and had significantly more bone marrow plasma cells ( = 0.025), higher 2-microglobulin levels ( = 0.036), and higher lactate dehydrogenase levels ( = 0.042) than those without del(1p32.3). Univariate analysis showed that patients with del(1p32.3) under thalidomide-based therapies (median PFS 11.6 vs. 31.2 months, = 0.002; median OS 16.8 vs. 45.9 months, <0.001) were strongly associated with short progression-free survival (PFS) ( = 0.002) and overall survival (OS) ( <0.001). Multivariate analysis revealed that del(1p32.3) remained a powerful independent factor with worse PFS ( = 0.006) and OS ( = 0.016) for patients under thalidomide-based treatments. Patients with del(1p32.3) under bortezomib-based treatments tended to have short PFS and OS. In conclusion, del(1p32.3) is associated with short PFS and OS in patients with MM who received thalidomide- or bortezomib-based treatments.

关键词： 1p32.3 deletion 1q21 gain prognosis multiple myeloma FISH bortezomib thalidomide

HTML PDF 收藏

Adsorption of 1,3-propanediol from synthetic mixture using polymeric resin as adsorbents

TANTAYAKOM, P. PRASITCHOKE, C. MUANGNAPOH

《化学科学与工程前沿（英文）》 2009年第3卷第1期页码 52-57 doi: 10.1007/s11705-009-0087-7

摘要： The aim of this work was to separate 1,3-PDO from a synthetic mixture using polymeric resins, Amberlite XAD-7 and XAD-16 resins. The equilibrium adsorption of 1,3-PDO onto two polymeric resins were investigated in binary and tertiary systems. Experimental results of binary component adsorption equilibrium indicated that the adsorption capacity ( ) of 1,3-PDO at 160 g/L onto XAD-7 and XAD-16 was 835.96 and 584.61 mg 1,3-PDO/g dry resin, respectively. The adsorption isotherms were closely predicted by the Langmuir-Freundlich model among the two isotherm model tested. The value of n of 1,3-PDO adsorbed on XAD-7 are much higher than those on XAD-16. This result suggested that XAD-7 resin has a higher affinity for the 1,3-PDO adsorption than XAD-16 resin. Moreover, the value of adsorption capacity of 1,3-PDO in the binary and tertiary component were compared at the same conditions. In the tertiary system, although the selectivity of 1,3-PDO from XAD-7 was approximately six times higher than XAD-16, the adsorption capacity of 1,3-PDO at 160 g/L onto XAD-16 was higher than XAD-7. Interestingly, the reusability of XAD-7 and XAD-16 resins in the three cycle times shows a slight loss of adsorption capacity. Furthermore, the investigation about desorption by an ethanol/water mixture at 50% ( / ) indicated that the desorption yield of 1,3-PDO from XAD-7 was lower than XAD-16 resin for both the binary and tertiary component. This was due to the more favorable adsorption characteristics of XAD-7 resin than XAD-16 resin.

关键词： adsorption 1 3-propanediol glycerol polymeric resin adsorption isotherm