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| 1 | Discovery of ultrahigh-pressure magnesite-bearing garnet lherzolite (>3.8 GPa) in the Altyn Tagh, Northwest China显示文摘Magnesite-bearing garnet Iherzolite from the Altyn Tagh, associated with garnet pyroxenite, and garnet-bearing felsic gneiss, crops out as lenses in Proterozoic gneiss about 100 km east of the Jianggelasayi River. The garnet Iherzolite, together with the eclogite in western Jianggelasayi, composes a high-pressure to ultrahigh-pressure metamorphic belt in the southern margin of the Altyn Tagh. Parageneses of minerals from magnesite-bearing garnet Iherzolite indicate that the rock evolved a multi-stage metamorphism. The peak-stage metamorphism produces an assemblage of Grt+Ol+Opx+Cpx±Mgs, in which A12O3 content of Opxis very low (0.30-0.66wt%). The calculated P-T condition of the peak stage is 3.8-5.lGPa and 880-970°C, some exsolution rods of clinopyroxene and rutile occur in the Grt and magnesite is rimed by dolomite and orthopyroxene, all implying that the peak stage was a UHP metamorphic process. Together with regional geological studies, isotopic dating and the discovery of coesite inclusions in | LIU Liang, SUN Yong, XIAO Peixi, CHE Zicheng, LUO Jinhai, CHEN Danling, WANG Yan, ZHANG Anda, CHEN Liang & WANG YongheKey Laboratory of Continental Dynamics of the Ministry of Education, Northwest University, Xi’an 710069, China The Northwest Institute of | 2002 | Chinese Science Bulletin2002，47，11： | 69 |
| 2 | Carbon assimilation characteristics of plants in oasis-desert ecotone and their response to CO_2 enrichment显示文摘Six species of more than 20-year-old desert woody plants in the oasis-desert ecotone were selected for study. The results showed that: (1) in different growing seasons δ13 C values of assimilating organ varied between -14‰ and -16‰ for Haloxylon ammodendron (HA),-14‰ - -15‰ for Calligonum mongolicum (CM) and -25‰ - -28‰ for Caragana korshinskii (CK), Nitraria sphaerocarpa (NS) and Hedysarum scoparium (HS). (2) The net photosynthetic rate (Pn) of HA and CM was significantly higher than those of the other species. With the decrease in Pn for the six species, their intercellular CO2 concentration increased, but stomatal limitation value decreased under the intensive light. At the same time, the photochemical efficiency of PS Ⅱ dropped to different degrees. (3) The CO2 enrichment experiment demonstrated that, Pn of HA and CM increased to different extent under 450 μmol/mol, but their Pn reduced or approximated to the current condition under 650 μmol/mol. Under 450 μmol/mol the efficiency for solar energy utilization of CK and HS significantly reduced and under 650 μmol/mol their respiration rate exceeded photosynthesis rate. It can be concluded that HA and CM have some function of pathway for C4, but the other three species have the function for C3. The decline in their Pn is mainly caused by non-stomatal factors. HA, CM, CK and HS exhibited photoinhibition, which disappeared in a short time. This is a kind of positive readjustment to adapting to the desert environment. HA and CM can adapt to the high CO2 environment, but CKand HS cannot. With the rise in atmospheric CO2 concentration and climate warming, the latter two species in the oasis-desert ecotone may be gradually degraded or even disappear. | SU Peixi CHEN Huaishun AN Lizhe LIU Xinmin | 2004 | Science China Earth Sciences2004，47，z1： | 6 |
| 3 | Pushing AI to wireless network edge:an overview on integrated sensing,communication,and computation towards 6G显示文摘Pushing artificial intelligence(AI)from central cloud to network edge has reached board consensus in both industry and academia for materializing the vision of artificial intelligence of things(AIoT)in the sixth-generation(6G)era.This gives rise to an emerging research area known as edge intelligence,which concerns the distillation of human-like intelligence from the vast amount of data scattered at the wireless network edge.Typically,realizing edge intelligence corresponds to the processes of sensing,communication,and computation,which are coupled ingredients for data generation,exchanging,and processing,respectively.However,conventional wireless networks design the three mentioned ingredients separately in a task-agnostic manner,which leads to difficulties in accommodating the stringent demands of ultra-low latency,ultra-high reliability,and high capacity in emerging AI applications like auto-driving and metaverse.This thus prompts a new design paradigm of seamlessly integrated sensing,communication,and computation(ISCC)in a taskoriented manner,which comprehensively accounts for the use of the data in downstream AI tasks.In view of its growing interest,this study provides a timely overview of ISCC for edge intelligence by introducing its basic concept,design challenges,and enabling techniques,surveying the state-of-the-art advancements,and shedding light on the road ahead. | Guangxu ZHU Zhonghao LYU Xiang JIAO Peixi LIU Mingzhe CHEN Jie XU Shuguang CUI Ping ZHANG | 2023 | Science China(Information Sciences)2023，66，3： | 2 |
| 4 | Destruction of the Northern Margin of the North China Craton in Mid-Late Triassic: Evidence from Asthenosphere-derived Mafic Enclaves in the Jiefangyingzi Granitic Pluton from the Chifeng Area, Southern Inner Mongolia显示文摘The petrology, geochronology and geochemistry of the mafic enclaves in the Mid-Late Triassic Jiefangyingzi pluton from Chifeng area, southern Inner Mongolia, in China are studied to reveal their petrogenetic relationship with the host pluton. Furthermore, the coeval magmatic assemblage and its petrogenesis on the northern margin of the North China craton(NCC) are studied synthetically to elucidate their tectonic setting and the implications for the destruction of the NCC. Zircon U-Pb dating reveals that the mafic enclaves formed at 230.4 ± 2.2 Ma, which is similar to the age of the host pluton. The most basic mafic enclaves belong to weak alkaline rocks, and they display rare earth element(REE) and trace element normalized patterns and trace element compositions similar to those of ocean island basalt(OIB). In addition, they have positive εNd(t) values(+3.84 to +4.94) similar to those of the Cenozoic basalts on the northern margin of the NCC. All of these geochemical characteristics suggest that the basic mafic rocks originated from the asthenosphere. Petrological and geochemical studies suggest that the Jiefangyingzi pluton and the intermediate mafic enclaves were formed by the mixing of the asthenosphere-derived and crust-derived magmas in different degrees. The Mid-Late Triassic magmatic rocks on the northern margin of the NCC could be classified into three assemblages according to their geochemical compositions: alkaline series, weak alkaline–sub-alkaline series and sub-alkaline series rocks. Petrogenetic analyses suggest that the upwelling of the asthenosphere played an important role in the formation of these Mid-Late Triassic magmatic rocks. Basing on an analysis of regional geological data, we suggest that the northern margin of the NCC underwent destruction due to the upwelling of the asthenosphere during the Mid-Late Triassic, which was induced by the delamination of the root of the collisional orogeny between Sino-Korean and Siberian paleoplates in Late Permian. | LIU Jianfeng LI Jinyi CHI Xiaoguo ZHENG Peixi HU Zhaochu ZHANG Xiaowei | 2020 | Acta Geologica Sinica(English Edition)2020，94，4： | 2 |
| 5 | Interpretation of Temperature Profiles during Soak Periods in Steam-stimulated Wells显示文摘To address the problems existing in testing steam injection profiles in a steam-stimulated well during steam injection and production periods,this paper proposes that the temperature profile in the completion interval could be tested during the soak period. A mathematical model for calculating the vertical distribution of temperature in a single layer reservoir is established based on the temperature characteristics of steam stimulated reservoirs,and the vertical distribution of temperature in a single layer reservoir could be obtained and heat loss could be calculated. The temperature,which is disturbed by thermal conduction in a multilayer reservoir,and heat loss could be derived based on the superposition principle of temperature potential. This paper establishes a multilayer testing temperature profile interpretation method and interprets the actual test temperature profile of Well Gao 3-7-66. The results indicate that the temperature profile in the soak period can reflect the thermal absorption conditions in various reservoir beds. | Liu Huiqing Zhang Hongling Wang Peixi | 2007 | Petroleum Science2007，4，4： | 2 |
| 6 | Watershed Allied Telemetry Experimental Research显示文摘 | Li Xin Li Xiaowen Li Zengyuan Ma Mingguo Wang Jian Xiao Qing Liu Qiang Che Tao Chen Erxue Yan Guangjian Hu Zeyong Zhang Lixin Chu Rongzhong Su Peixi Liu Qinhuo Liu Shaomin Wang Jindi Niu Zheng Chen Yan Jin Rui Wang Weizhen Ran Youhua | 2009 | Journal of Geophysical Research Atmospheres2009，，22： | 1 |
| 7 | Microsurgical treatment of posterior inferior cerebellar aneurysms based on angioarchitecture supplemented by high-resolution vessel wall MRI:a case series report显示文摘Background Surgical treatment of posterior inferior cerebellar artery(PICA)aneurysms is challenging because many are nonsaccular and atherosclerotic.We report our tailored approach to PICA aneurysms,which is based on angioarchitecture supplemented by high-resolution vessel wall MRI(HR-VW MRI)findings.Methods From March 2010 to September 2020,27 patients with 29 PICA aneurysms underwent surgical treatment in our institution.Since October 2016,HR-VW MRI has been used for aneurysmal wall assessment.Clinical characteristics,radiological data and surgical outcomes were analysed.Results Nineteen proximal PICA aneurysms(vertebral artery(VA),P1,P2 and P3)were treated using the far-lateral approach.Ten distal PICA aneurysms(P4,P5)were treated using the suboccipital midline approach.Direct clipping or clip reconstruction was achieved in 19 aneurysms.Ten were trapped in conjunction with extracranial-intracranial or intracranial-intracranial bypass,including three occipital artery-PICA reimplantations,three PICA-VA reimplantations,two PICA-PICA side-to side anastomoses,one PICA-PICA reimplantation and one PICA-PICA reanastomosis.All aneurysms were eventually completely obliterated and all bypasses remained patent.At the last follow-up,26 patients(96.2%)achieved a good outcome(modified Rankin Scale score<3).Eight patients underwent HR-VW MRI.Among these,the six aneurysms with focal wall enhancement required bypass and the two with negative enhancement were successfully clipped.Conclusion PICA aneurysms have a higher frequency of complex features such as large or giant size and fusiform or dissecting morphology.Favourable outcomes were achieved with individualised microsurgical strategies based on angioarchitecture.HR-VW MRI may be used as a promising technique to predict aneurysmal atherosclerosis. | Zixiao Yang Jianping Song Kai Quan Peiliang Li Qingzhu An Yuan Shi Peixi Liu Guo Yu Yanlong Tian Liangfu Zhou Wei Zhu | 2022 | Stroke & Vascular Neurology2022，7，4： | 1 |
| 8 | Training time minimization for federated edge learning with optimized gradient quantization and bandwidth allocation显示文摘Training a machine learning model with federated edge learning(FEEL)is typically time consuming due to the constrained computation power of edge devices and the limited wireless resources in edge networks.In this study,the training time minimization problem is investigated in a quantized FEEL system,where heterogeneous edge devices send quantized gradients to the edge server via orthogonal channels.In particular,a stochastic quantization scheme is adopted for compression of uploaded gradients,which can reduce the burden of per-round communication but may come at the cost of increasing the number of communication rounds.The training time is modeled by taking into account the communication time,computation time,and the number of communication rounds.Based on the proposed training time model,the intrinsic trade-off between the number of communication rounds and per-round latency is characterized.Specifically,we analyze the convergence behavior of the quantized FEEL in terms of the optimality gap.Furthermore,a joint data-and-model-driven fitting method is proposed to obtain the exact optimality gap,based on which the closed-form expressions for the number of communication rounds and the total training time are obtained.Constrained by the total bandwidth,the training time minimization problem is formulated as a joint quantization level and bandwidth allocation optimization problem.To this end,an algorithm based on alternating optimization is proposed,which alternatively solves the subproblem of quantization optimization through successive convex approximation and the subproblem of bandwidth allocation by bisection search.With different learning tasks and models,the validation of our analysis and the near-optimal performance of the proposed optimization algorithm are demonstrated by the simulation results. | Peixi LIU Jiamo JIANG Guangxu ZHU Lei CHENG Wei JIANG Wu LUO Ying DU Zhiqin WANG | 2022 | Frontiers of Information Technology & Electronic Engineering2022，23，8： | 0 |
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