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On the location of the secondary instantaneous poles in two-degree-of-freedom spherical mechanisms

Soheil ZARKANDI

《机械工程前沿（英文）》 2014年第9卷第1期页码 34-40 doi: 10.1007/s11465-014-0290-1

摘要：

As the instant centers in planar mechanisms, the instantaneous poles (or instant poles, in brief) can be used for kinematic analysis in spherical mechanisms. One of the mandatory steps in this analysis is the determination of the location of these poles. This paper presents a theorem showing analytically that the locus of an unknown secondary instant pole in two-degree-of-freedom (2-DOF) spherical mechanisms is a great circle (GC). The exact location of the pole on its GC is obtained based on the configuration of the mechanism and velocity ratio of the two inputs. Moreover, using the results of the theorem, a geometrical technique is presented to determine the GC of the pole.

关键词： spherical mechanisms instantaneous poles great circle angular velocity

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Application of digital holography to circle flow bed boiler measurement

PU Shiliang, WANG Qinghui, CEN Kefa, Denis Lebrun, REN Kuanfang

《能源前沿（英文）》 2007年第1卷第2期页码 218-222 doi: 10.1007/s11708-007-0029-3

摘要： The spatial distribution of particles in the boiler is very important in the study on the circle flow bed boiler (CFB). Digital in-line holography technique was applied to obtain the spatial and diameter distribution of the particles inside the boiler. A HE-NE laser was used to illuminate the particles inside the CFB through two glass windows and the in-line diffraction pattern was recorded by a CCD camera. The diffraction can be interpreted as a convolution between a family of wavelet functions and the object function. So the three-dimensional (3D) images of the particles in the two-phase flow were reconstructed by the convolution between diffraction pattern and wavelet functions. The particle diameters and 3D coordinates were calculated from the reconstructed 3D images by a series of image-processing methods, followed by a discussion of the experimental results.

关键词： HE-NE function convolution two-phase diffraction

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Promoting Agriculture Green Development to realize the great rejuvenation of the Chinese nation

YU Xinrong

《农业科学与工程前沿（英文）》 2020年第7卷第1期页码 112-113 doi: 10.15302/J-FASE-2019318

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Therapeutic effect of medical glue combined with the great omentum in severe tunica muscularis injury

REN Peitu, LU Baochun, RUAN Xinxian, CHEN Zhiliang, MA Yuliang, FU Hong

《医学前沿（英文）》 2008年第2卷第2期页码 143-146 doi: 10.1007/s11684-008-0027-9

摘要： Twenty-seven patients with severe colon trauma treated in the Shaoxing People’s Hospital from 1995 to 2006 were retrospectively analyzed. The patients with severe tunica muscularis injury were treated by medical glue combined with the greater omentum during operations. The initial result was encouraging. All patients were cured with no anastomotic leakage or abscess. Therefore, reasonable use of medical glue combined with the greater omentum can not only improve the curative rate but also reduces postoperative complications for patients with colon injury.

关键词： abscess initial muscularis anastomotic medical

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Numerical investigation of circle defining curve for two-dimensional problem with general boundaries

Chung Nguyen VAN

《结构与土木工程前沿（英文）》 2019年第13卷第1期页码 92-102 doi: 10.1007/s11709-018-0472-8

摘要： The scaled boundary finite element method (SBFEM) is applied to the static analysis of two dimensional elasticity problem, boundary value problems domain with the domain completely described by a circular defining curve. The scaled boundary finite element equations is formulated within a general framework integrating the influence of the distributed body force, general boundary conditions, and bounded and unbounded domain. This paper investigates the possibility of using exact geometry to form the exact description of the circular defining curve and the standard finite element shape function to approximate the defining curve. Three linear elasticity problems are presented to verify the proposed method with the analytical solution. Numerical examples show the accuracy and efficiency of the proposed method, and the performance is found to be better than using standard linear element for the approximation defining curve on the scaled boundary method.

关键词： exact geometry circular defining curve general boundaries SBFEM

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Effect of end-to-end invagination pancreaticojejunostomy with circle discontinuous U suture in pancreatic

ZHANG Xuewen, XUAN Wei, JIANG Tao, JI Degang, YANG Yongsheng, ZHANG Dan, XIE Yingjun, MENG Zihui, ZHAO Jisheng

《医学前沿（英文）》 2007年第1卷第1期页码 46-48 doi: 10.1007/s11684-007-0009-3

摘要： The aim of this paper is to summarize the methods of pancreaticojejunostomy in the pancreatic operation and to study the safety and feasibility of a new operative method called end-to-end invagination pancreaticojejunostomy with circle discontinuous U suture to prevent fistula of pancreaticojejunostomy. Eight-three patients with pancreaticoduodenectomy in the 3rd Hospital, Jilin University from 2001 January to 2006 April were reviewed. The incidences of pancreatic fistula with different types of pancreaticojejunostomy were compared. The overall incidence rate of pancreatic fistula was 26.5% (22/83). No pancreatic fistula occurred in end-to-end invagination pancreaticojejunostomy with circle discontinuous U suture. The incidence rate of the fistula following end-to-end invagination pancreaticojejunostomy with circle discontinuous U suture was significantly lower than that of traditional end-to-end pancreaticojejunostomy [40%, (10/25), <0.01] and end-to-side pancreaticojejunostomy [27.3%, (12/44), <0.05], but no significant difference (>0.05) between traditional end-to-end pancreaticojejunostomy and end-to-side pancreaticojejunostomy was discovered. End-to-end invagination pancreaticojejunostomy with circle discontinuous U suture has a definite effect on avoiding pancreatic fistula following pancreaticojejunostomy and is worth being recommended. But the cases were limited, so this method would still need to be observed and confirmed further in the future.

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中国建设“矿产资源强国”的内涵探讨和政策建议

李政,姜兴伟,麻林巍,吴金希,于宏源,孔庚

《中国工程科学》 2019年第21卷第1期页码 55-60 doi: 10.15302/J-SSCAE-2019.01.008

摘要：

本文旨在从矿产资源行业发展的整体国际环境出发，对“矿产资源强国”这一新兴概念进行系统分析并提出相关政策建议。首先，通过剖析和对比古今中外的“强国”概念，结合矿产资源行业的特点，引出了“矿产资源强国”的内涵和定义。然后通过美国和中国矿产资源行业的案例分析验证其定义。最终，提出“矿产资源强国”是“以推动矿产资源可持续发展和全球治理为目的，能够对全球矿产资源行业的生产、金融、治理和知识体系产生较大影响，并可由此保障自身政治和经济利益的国家”。当前，中国迫切需要基于较为强大的生产层面影响力，加强金融、治理和知识层面对于全球矿产资源行业的影响力。

关键词：矿产资源强国可持续发展全球治理

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mTOR-targeted cancer therapy: great target but disappointing clinical outcomes, why?

Shi-Yong Sun

《医学前沿（英文）》 2021年第15卷第2期页码 221-231 doi: 10.1007/s11684-020-0812-7

摘要： The mammalian target of rapamycin (mTOR) critically regulates several essential biological functions, such as cell growth, metabolism, survival, and immune response by forming two important complexes, namely, mTOR complex 1 (mTORC1) and complex 2 (mTORC2). mTOR signaling is often dysregulated in cancers and has been considered an attractive cancer therapeutic target. Great efforts have been made to develop efficacious mTOR inhibitors, particularly mTOR kinase inhibitors, which suppress mTORC1 and mTORC2; however, major success has not been achieved. With the strong scientific rationale, the intriguing question is why cancers are insensitive or not responsive to mTOR-targeted cancer therapy in clinics. Beyond early findings on induced activation of PI3K/Akt, MEK/ERK, and Mnk/eIF4E survival signaling pathways that compromise the efficacy of rapalog-based cancer therapy, recent findings on the essential role of GSK3 in mediating cancer cell response to mTOR inhibitors and mTORC1 inhibition-induced upregulation of PD-L1 in cancer cells may provide some explanations. These new findings may also offer us the opportunity to rationally utilize mTOR inhibitors in cancer therapy. Further elucidation of the biology of complicated mTOR networks may bring us the hope to develop effective therapeutic strategies with mTOR inhibitors against cancer.

关键词： mTOR cancer therapy resistance GSK3 protein degradation E3 ubiquitin ligase PD-L1

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Establishing Profiles for Systems Engineering Standards: A Great Help for Companies to Manage Their Processes

Rui Xue,Claude Baron,Philippe Esteban,Qiang Zhang

《工程管理前沿（英文）》 2014年第1卷第3期页码 297-303 doi: 10.15302/J-FEM-2014036

摘要： In this paper, we discuss how to establish profiles of system engineering standards for companies. To define an appropriate system engineering standard for a company, this paper presents a detailed comparison between the current releases of the main system engineering sta-ndards (ANSI/ EIA-632, ISO/IEC-15288 and IEEE-1220), and explains how to choose the most adapted one according to the company practices. When no standard completely corresponds, the paper illustrates how to elaborate a tailor-made standard on the basis of specific required characteristics of the company or of the project, following a multi-standard approach, leading to extend and adapt a sta-ndard by importing some elements from another.

关键词： system engineering analysis comparison systems engineering management process multi-standards approach

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构建煤炭资源强国的战略路径与对策研究

张博,彭苏萍,王佟,宋梅

《中国工程科学》 2019年第21卷第1期页码 88-96 doi: 10.15302/J-SSCAE-2019.01.013

摘要：

煤炭是我国的优势矿产资源，在能源结构中具有基础性地位。作为全球煤炭资源开发利用大国，新形势下我国建设煤炭资源强国的重要性日益凸显。本文在界定煤炭资源强国概念与内涵的基础上，辨识了煤炭资源强国的主体要素特征，并从绿色煤炭资源、工程技术、人才教育、企业经济、“一带一路”等要素层面，全面评价了我国实现煤炭资源强国的差距，进而明确了构建煤炭资源强国的战略目标与路径，最终提出了相应的政策建议。研究发现，我国已经具备建设煤炭资源强国的基础，但在煤炭资源勘探开发与转化利用相关的技术、产业、市场等方面仍存在诸多问题。实现煤炭资源强国，亟待强化绿色煤炭资源基础、工程科技创新能力、企业发展与市场环境建设以及人才与制度保障，系统提升煤炭工业的全球竞争力。

关键词：煤炭资源强国可持续发展能源战略

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韦伯太空望远镜终于发射升空

Mitch Leslie

《工程（英文）》 2022年第11卷第4期页码 3-5 doi: 10.1016/j.eng.2022.02.002

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奋斗创伟业改革结硕果——不断发展的昆明贵金属研究所

null

《中国工程科学》 1999年第1卷第2期页码 99-100

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有理包络线的蒙皮应用

Kinga KRUPPA1,2

《信息与电子工程前沿（英文）》 2021年第22卷第2期页码 141-286 doi: 10.1631/FITEE.1900377

摘要：闵可夫斯基空间中的特殊曲线如闵可夫斯基毕达哥拉斯矢端线，在计算机辅助几何设计中有着重要作用，其应用近年来得到深入研究。Bizzarri等人在2016年介绍了一类有理包络（RE）曲线；提出用于G1 Hermite数据的插值方法，其合成的RE曲线能对所表示的区域生成有理边界。本文提出RE曲线的一类新的应用领域——离散输入圆集的蒙皮。若未选择正确的Hermite数据进行插值，得到的RE曲线将不适合蒙皮。本文介绍一种新颖的方法，按此方法得到的包络曲线能够接触每个圆预定的接触点。因此，我们克服了因接触点位置导致不适合蒙皮的问题。本文所提方法的一个显著优点在于其边界偏移量修剪的效率，这在计算机数控方面非常有用。

关键词：中轴变换；包络；插值；蒙皮；圆

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PROGRESS ON IMPROVING AGRICULTURAL NITROGEN USE EFFICIENCY: UK-CHINA VIRTUAL JOINT CENTERS ON NITROGEN AGRONOM

《农业科学与工程前沿（英文）》 2022年第9卷第3期页码 475-489 doi: 10.15302/J-FASE-2022459

摘要：

● Virtual joint centers on N agronomy were established between UK and China.

关键词： CINAg N-CIRCLE nitrogen use efficiency reactive nitrogen sustainable production

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我国卫星海洋空间探测

蒋兴伟,林明森,刘建强

《中国工程科学》 2008年第10卷第6期页码 56-62

摘要：

分析了卫星遥感海洋探测技术的发展趋势，以及其对海洋科学的影响。回顾了海洋卫星遥感技术的发展历程，并把国内海洋遥感技术与国外相应技术作了简单对比，指出两者的区别。介绍了我国2007—2020年海洋遥感卫星发射的关键技术，其发展的第一个里程碑是HY－1和HY－2卫星的发射，主要用于监控海洋灾害，比如赤潮、油类溢出、水质和海冰等。最后提出了我国发展卫星遥感应用技术的建议。

关键词：海洋卫星发展规划海洋强国