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为了研究索网结构静力荷载下的内力和变形特点，按照1∶10比例设计制作了西安国际足球中心的缩尺模型试件，采用新型空间结构水重力点阵加载系统逐级控制加载，以及DACS-Measure现场测量系统，分别对该模型上半跨、右半跨及全跨进行了分级静力加载试验。试验结果表明：新型空间结构点阵自动同步加载系统能实现任意比例、多点同步精确加载，普遍适用于各类空间结构加载试验；在不同加载模式下，索网竖向变形随荷载增加均基本呈现线性变化，且最大变形发生在索网洞口边缘处；上半跨荷载、右半跨荷载及全跨荷载下索力最大位置均位于索网中轴偏右位置处。研究成果可为我国以后此类索网结构的加工制造及施工应用提供技术参考。

文章介绍了国际标准组织中下一代网络（NGN）体系结构的最新研究进展,探讨了下一代网络可能的演进路线:从软交换到因特网协议（IP）多媒体子系统（IMS）,即网络走向融合的道路。文章着重介绍了IMS的结构和功能实体。

从通信楼定时系统 BITS设备在同步网中的应用方式出发 ,介绍了 BITS设备 Clock-Star的设计原理和功能结构 ,并且重点分析了其中的直接频率合成 DDS技术的原理和特点 ,并给出了时钟设备的实际测试数据

文章介绍了智能网与Internet互通的原理,以及PINT（PSTN Internet iNTerworking）业务的基本概念和网络结构,并对PINT协议进行了分析。同时给出了智能网与Internet互联的模型,并结合点击拨号业务讨论了其具体的实现方式。最后讨论了互联时的安全问题。

利用段开销中未定义字节传送数据的开销扩展盘，已成为武汉邮电科学研究院的SDH传输设备系列产品的特色功能设置。通过开销扩展功能，用户还可以在监控终端读或写某个开销字节。本文介绍了开销扩展功能和研制。

针对现有媒体服务器处理方法中硬件方式成本高、软件方式容量小的弊端,提出一种基于主机媒体处理（HMP）的媒体服务器处理方法。IP多媒体通信中有一部分较低端的业务,可以根据其对实时性要求不高的特点,采用单通道非实时的编码转换方式对这类业务进行媒体处理,用存储资源换取系统处理媒体的能力,使系统提高处理高端业务的效率,改进业务处理的服务质量。这种设计方法按需分配,能够科学合理地利用系统的整体资源,提高媒体服务器的性能。

由于会话初始协议（SIP）已逐渐成为下一代网络的核心协议,并广泛应用于电信等关键部门,因此,对SIP服务器的可用性要求也越来越高。文章根据对SIP协议栈分层结构重新认识,提出了一套完整的高可用SIP协议栈解决方案,在此方案的基础上,详细介绍了协议栈滚动升级策略,并研究了其在部署过程中遇到的一些问题和应对措施。

综合接入媒体网关（AMG）位于基于软交换（SoftSwitch）的下一代网络（NGN）的接入层面,其高可用性（HA）直接影响着电信网络的服务质量。文章首先介绍了HA的概念及实现,然后通过对综合AMG的结构及功能的研究,提出了一种实现其HA的方案。在硬件部分,以主备方式的硬件冗余机制来实现硬件容错功能,关键数据及参数的备份均采用温备份方式。在软件部分,提出了实现HA的整体架构以及实现倒换的状态机制。

由我国自行研制和开发的２４８８Ｍｂｉｔ／ｓＳＤＨ复接传输设备和再生中继设备已经成功地应用于从海口市至三亚市长途大容量光缆传输系统。其中还配有若干个１５５Ｍｂｉｔ／ｓ复用设备。本文将简要地介绍该系统的构成及设备特征等情况。

Copyright of Electric Drive for Locomotives is the property of Electric Drive for Locomotives Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Precious Metals / Guijinshu is the property of Precious Metals Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Water Conservancy & Electric Power Technology & Application is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Water Conservancy & Electric Power Technology & Application is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Tissue Engineering Research / Zhongguo Zuzhi Gongcheng Yanjiu is the property of Chinese Journal of Tissue Engineering Research and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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BACKGROUND: The distribution of the necrotic area plays an important role in hip preservation treatment. At present, there are few studies on whether the difference in the three-dimensional spatial distribution of osteonecrosis of the femoral head affects the clinical outcome of fibular support. OBJECTIVE: To explore the relationship between the spatial distribution and clinical outcome at the sites of osteonecrosis of the femoral head and fibular support using CT three-dimensional reconstruction so as to provide a basis for optimizing the applicable conditions of fibular support and improving the hip preservation effect of fibular support. METHODS: Eighty patients with osteonecrosis of the femoral head who were treated with fibular support for hip preservation from January 2010 to January 2021 were selected as the study subjects according to the inclusion criteria. They were followed up for at least 2 years. According to the clinical outcome, the patients were divided into the successful hip preservation group (n=55) and the failure hip preservation group (n=25). 3D reconstruction was performed according to the preoperative and postoperative CT images of the patients. According to the three-column theory, the femoral head was divided into outer nine areas, middle nine areas and inner nine areas (L1-9, C1-9, and M1-9) to explore the spatial distribution of necrotic area of the femoral head and fibular support area and its relationship with clinical outcome. RESULTS AND CONCLUSION: (1) Before operation, the necrotic area of the femoral head was mainly distributed in L1, L2, L4, L5, C1, C2, C4, and C5 (the upper and middle part of the anterior part of the outer ninth area and the middle part of the middle ninth area). After operation, the fibular support area was mainly distributed in L5, L6, C5, and C6 (the middle and lower part of the outer ninth area and the middle and lower part of the middle ninth area). (2) There were significant differences in the distribution of osteonecrosis of the femoral head between the successful hip preservation group and the failure hip preservation group in L8 (the posterior middle part of the outer ninth area), C3 (the anterior lower part of the middle ninth area), C6 (the lower middle part of the middle part of the inner ninth area) and M2 (the anterior middle part of the inner ninth area) (P < 0.05). There was a significant difference in the distribution of fibular support in L5 and L6 (middle and lower part of outer nine) (P < 0.05). Among them, the L8 region could be used as an independent predictor of hip preservation failure in fibular support surgery. The area under the curve of the L8 single factor prediction model was 0.698 [95%CI (0.575, 0.822)]; the sensitivity was 76%, and the specificity was 63.6%. (3) It turns out, when the necrotic area involves L8, C3, C6, and M2, especially L8, the failure of fibular support may increase, and when the fibular support involves L5 and L6, the effect of hip preservation is often not ideal. [ABSTRACT FROM AUTHOR]

Objective To investigate whether methionine metabolic axis could be a potential therapeutic target for multiple myeloma (MM). Methods Ten MM patients (newly diagnosed and treatment-responsive groups) were selected from the Department of Hematology, and five healthy individuals who voluntarily donated bone marrow supernatant from the Affiliated Hospital of Guangdong Medical University were chosen as the control group. Targeted quantitative metabolomics analysis of bone marrow supernatants from the three groups was performed using ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS). Multivariate statistical analysis was conducted on the metabolomics data. Human MM-related high-throughput gene chip data from the NCBI GEO database were analyzed using online tools Cell Ranger and Seurat software, and bioinformatics analysis techniques were used to identify common differential genes. Key genes related to the methionine metabolism axis in MM were screened. Results The levels of methionine and cysteine in the bone marrow supernatants of MM patients were significantly elevated (P<0.05). Enzymes involved in the methionine cycle, including methionine adenosyltransferase 2 A (MAT2 A), adenosylhomocysteinase (AHCY), and protein arginine methyltransferase 1 (PRMT1), were found to be associated with MM progression. Conclusion The key enzymes MAT2 A, AHCY, and PRMT1 may influence the biological behavior and disease progression of MM by regulating methionine metabolism. [ABSTRACT FROM AUTHOR]

Copyright of Power Generation Technology is the property of Power Generation Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Impact SEA (ISEA) is a method to evaluate impact performance based on energy propagation. ISEA is used for the design of impact structures considering dynamic progressive buckling. In this paper, from the load-stroke diagrams used in vehicle body design, crash members are designed via the ISEA model and verified by FEM analysis that presents the development and validation of a design procedure using ISEA. [ABSTRACT FROM AUTHOR]

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Copyright of Engineering Science Research & Application is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Engineering Science Research & Application is the property of Omniscient Pte. Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Spring-mass systems are commonly used in the design of vehicles considering crash worthiness for occupant protection. On the other hand, if the crash is considered as the absorption of the vehicle's kinetic energy in the crushable zone, it can be regarded as a damper-mass system. In this paper, an impact model using damper-mass system is compared with a spring-mass system, assuming a situation where the front frame of the vehicle is crushed by the impact. As a result, it can be said that it is reasonable to use the damper mass system as an impact model. [ABSTRACT FROM AUTHOR]

This paper proposes a new method for analyzing the impact performance of vehicle bodies in the early stages of design. The method is called Impact Statistical Energy Analysis (ISEA), which is based on the propagation of energy and considers the conversion of kinetic energy of the structure into internal energy in the deformed parts of the structure during a crash. The paper discusses the effectiveness of ISEA in comparison with damper mass models and FEM models for one- and two-member structures. [ABSTRACT FROM AUTHOR]

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Copyright of Journal of Computer-Aided Design & Computer Graphics / Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao is the property of Gai Kan Bian Wei Hui and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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