基于MAS的分布式协同设计任务冲突处理研究

任务分解与冲突控制是网络分布式环境下进行产品并行设计的关键．通过收集产品各领域的指标约束与关系约束来构建基于约束网络的产品参数协调模型，采用区间描述设计变量的不确定性信息，并将区间算法与基因算法相结合实现了一致性模型求解框架，使用该方法能够检测潜在冲突，得到与给定产品指标相对应的设计变量可靠解空间，进而辅助设计人员决策。同时采用Agent技术对协同设计中多群体多层次的设计任务和设计进程进行管理和控制，建立了以项目和任务为中心的协同设计Agent模型，研究了模型共享、协同设计agent、并发控制机制等关键技术，构建了一个基于多Agent的分布式实时协同设计原型系统应用实例说明了其有效性。     

A 23 GHz high-temperature superconducting microstrip filter for radio astronomy

This paper reports a 6-pole high-temperature superconducting （HTS） microstrip bandpass filter for radio astronomy applications. The filter has a center frequency of 23 GHz and a bandwidth the 2 GHz. We have made many efforts, such as adopting 0.25-mm-thick substrate, carefully designing the housing box and filter layout, to solve the problems in realizing a K-band planar filter. A special straight-line half-wavelength resonator （center-widen resonator） was also designed to reduce the insertion loss of the filter. The measured results showed a midband insertion loss of 0.11 dB with a ripple of 0.4 dB, and a return loss better than 11.5 dB. Good agreement was obtained between simulated and measured results.     

3D打印技术的发展及其软件实现

随着3D打印技术的不断发展,其已经超越传统单材均质加工技术的限制,成为可实现多材料、功能梯度材料、多色及真彩色表面纹理贴图制件的直接制造;可跨越多个尺度(从微观结构到零件级的宏观结构)直接制造;并与传统加工工艺结合,可实现多种兼顾精度和形状复杂度的新型加工方法.本文叙述了国内外上述技术的研究发展概况,并论述了传统建模技术、3D打印数据交换格式、数据处理软件架构等方面应对3D打印技术最新发展和挑战的对策.     

Export and remineralization of POM in the Southern Ocean and the South China Sea estimated from ~(210)Po/~(210)Pb disequilibria

Disequilibria between 210Po and 210Pb in the upper water and their potential applications as a proxy of particle export and remineralization were examined in the Southern Ocean (station IV3) and the South China Sea (NS44). 210Po was deficit in surface waters but excessive relative to 210Pb in subsurface waters. Good positive correlation between 210Po and particulate organic carbon (POC) indicated deficits and excess of 210Po resulted from particulate organic matter (POM) export and remineralization respecti...     

The age of the base of the paleoproterozoic Hutuo Group in the Wutai Mountains area,North China Craton: SHRIMP zircon U-Pb dating of basaltic andesite

Basalt and basaltic andesite metamorphosed at greenschist facies occurs with conglomerate layers at the bottom of the Paleopro-terozoic Hutuo Group in the Wutai Mountains area, North China Craton. Detailed geological surveying confirms that these volcanic rocks are conformable within the neighboring sedimentary rocks. The SHRIMP results on basaltic andesite are divided into two groups. In one group the ²⁰⁷Pb/²⁰⁶Pb ages are from 2433 to 2558 Ma, which is consistent with the basement crustal age in Fuping and Wutai areas. In the other group, 13 grains yielded a weighted mean ²⁰⁷Pb/²⁰⁶Pb age of 2140±14 Ma. The latter is interpreted as the eruption age of the basaltic andesite, and gives the age of the base of the Hutuo Group. This result further suggests that the Hutuo Group formed in the middle Paleoproterozoic, not the early Palaeoproterozoic or late Archaean, as thought before, and is related to a 2.2–2.1 Ga rifting event in the Central North China Craton.     

Palaeoproterozoic Khondalite Belt in the western North China Craton： New evidence from SHRIMP datin8 and Hf isotope composition of zircons from metamorphic rocks in the Bayan Ui-Helan Mountains area

Zircom U-Pb age and Hf isotope analyses were made on gneissic granite and garnet-mica two-feldspar gneiss from the Helanshan Group in the Bayan Ul-Helan Mountains area, the western block of the North China Craton (NCC). Zircons from the gneissic granite commonly show core-mantle-rim structures, with magmatic core, metamorphic mantle and rim having ages of 2323±20 Ma, 1923±28 Ma and 1856±12 Ma, respectively. The core, mantle and rim show similar Hf isotope compositions, with single-stage depleted mantle model ages (TDM1) of 2455 to 2655 Ma (19 analyses). Most of the detrital zircons from the garnet-mica two-feldspar paragneiss have a concentrated U-Pb age distribution, with a weighted mean 207Pb/206Pb age of 1978±17 Ma. A few detrital zircons are older (2871 to 2469 Ma). The age for metamorphic overgrown rim was not determined because of strong Pb loss due to their high U content. The zircons show large variation in Hf isotope composition, with TDM1 ages of 1999 to 3047 Ma. In com- bination with previous studies, the main conclusions are as follows: (1) protolith of the khondalite se- ries in the Helanshan Group formed during Palaeoproterozoic rather than the Archaean as previously considered; (2) The results lend support to the contention that there is a huge Palaeoproterozoic Khondalite (metasedimentary) Belt between the Yinshan Mountains Block and the Ordos Block in the Western Block of NCC; (3) The widely-distributed bodies of early Palaeoproterozoic orthogneisses in the Khondalite Belt might be one of the important sources for detritus material in the khondalite series; (4) Collision between the Yinshan Block, the Ordos Block and the Eastern Block occurred in the same tectonothermal event of late Palaeoproterozoic, resulting in the final assembly of the NCC.