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Morphology and features of Cambrian oncoids and responses to palaeogeography of the North China Platform

Journal of Palaeogeography 2020年第2期9卷 150-167页

作者： en-Zhao Xiao Ming-Xiang Mei Shu jiang Tehseen Zafar School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China Key Laboratory of Tectonics and Petroleum Resources of Ministry of Education and Faculty of Earth Resources China University of Geosciences(Wuhan)Wuhan 430074China Institute of Geochemistry Chinese Academy of SciencesGuiyang 550081China Institute of Geology University of the PunjabLahore 54590Pakistan

The Cambrian strata in the North China Platform are fully exposed. A wide variety of carbonate oncoids with different shapes occur in the Xuzhuang and Zhangxia formations(Miaolingian Series) from six Cambrian sections in the study area. A comprehensive study involving outcrop description, microscopic observation, scanning electron microscopy(SEM), energy dispersive X-ray spectroscopy(EDX), X-ray diffraction(XRD), and carbon and oxygen isotope analysis is conducted to determine the facies, morphology, internal structure, and geochemical properties of the oncoids. The oncoids are divided into six types based on their morphology and internal *** and ultrastructural observations reveal typical microbial fossils(Girvanella) and microbially-related sediments(framboidal pyrite), indicating the biogenicity of the oncoids. Additionally, the XRD and carbon and oxygen isotope analysis results suggest that the formational environments of these oncoids are different due to terrestrial influences. Statistical data on the oncoids from the six sections show that there are obvious differences in the types of oncoids and the proportions of different varieties in each section. The spatial differences in the oncoid morphologies are associated with different palaeogeographic settings. The rough oncoid growth patterns developed in nearshore environments were influenced by terrigenous debris and steep terrain, whereas the delicate oncoid growth patterns developed in offshore environments were less affected by terrestrial factors and were featured by more stable depositional processes related to microbial mats.

关键词： Morphological classification Microbial m at Girvonello Carbon and oxygen isotopes Miaolingian series North China

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CONVERGenCE OF MODIFIED TRUNCATED EULER-MARUYAMA METHOD FOR STOCHASTIC DIFFERenTIAL EQUATIONS WITH HOLDER DIFFUSION COEFFICIenTS

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Journal of Computational Mathematics 2024年第4期42卷 1109-1123页

作者： Guangqiang Lan yu jiang College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Convergence of modified truncated Euler-Maruyama(MTEM)method for stochastic differential equations(SDEs)with(1/2+α)-Holder continuous diffusion coefficients are investigated in this *** prove that the MTEM method for... 详细信息

关键词： Stochastic differential equations Modified truncated Euler-Maruyama method Strong convergence One-sided Lipschitz Holder continuous

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Anesthetic management for intraoperative acute pulmonary embolism during inferior vena cava tumor thrombus surgery:A case report

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World Journal of Clinical Cases 2022年第15期10卷 5111-5118页

作者： Pei-yu Hsu en-Bo Wu Department of Anesthesiology China Medical University HospitalChina Medical UniversityTaichung 404Taiwan Department of Anesthesiology Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of MedicineKaohsiung 833Taiwan

BACKGROUND Acute pulmonary embolism(APE)is a rare and potentially life-threatening condition,even with early detection and prompt *** APE required specific ways for detecting since classic symptoms of APE in the awake patient could not be observed or self-reported by the patient under general *** SUMMARY A 44-year-old man with a history of hepatic cell carcinoma was admitted for radical nephrectomy and tumor thrombectomy due to a newly found kidney tumor with inferior vena cava(IVC)tumor *** that occurred during tumor thrombectomy with hypercapnia and *** capnography combined with the transesophageal echocardiography(TEE)provided a crucial differential diagnosis during the *** patient was continuously managed with aggressive intravenous fluid resuscitation and blood transfusion under continuous cardiac output monitoring to maintain hemodynamic *** completed the surgery under stable hemodynamics and was extubated after percutaneous mechanical thrombectomy by a certified *** were no significant symptoms and signs or obvious discomfort in the patient’s self-report during visits to the general *** Under general anesthesia for IVC tumor thrombus surgery,a sudden decrease in end-tidal carbon dioxide is the initial indicator of APE,which occurs before hemodynamic *** intraoperative APE is suspected,TEE is useful in the diagnosis and monitoring before computer tomography pulmonary *** clinical impression and supportive treatment and intervention should be conducted to obtain a better prognosis.

关键词： Acute pulmonary embolism Anesthesia end-tidal carbon dioxide Inferior vena cava tumor thrombus Transesophageal echocardiography Case report

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Improved lattice-based CCA2-secure PKE in the standard model

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Science China(Information Sciences) 2020年第8期63卷 147-168页

作者： jiang ZHANG yu yu Shuqin FAN Zhenfeng ZHANG State Key Laboratory of Cryptology Guangdong Provincial Key Laboratory of Data Security and Privacy Protection Jinan University Department of Computer Science and engineering Shanghai Jiao Tong University Trusted Computing and Information Assurance Laboratory Institute of SoftwareChinese Academy of Sciences

Based on the identity-based encryption(IBE) from lattices by Agrawal et al.(Eurocrypt’10),Micciancio and Peikert(Eurocrypt’12) presented a CCA1-secure public-key encryption(PKE), which has the best known efficiency in the standard model and can be used to obtain a CCA2-secure PKE from lattices by using the generic BCHK transform(SIAM J Comput, 2006) with a cost of introducing extra overheads to both computation and storage for the use of other primitives such as signatures and commitments. In this paper, we propose a more efficient standard model CCA2-secure PKE from lattices by carefully combining a different message encoding(which encodes the message into the most significant bits of the LWE’s "secret term") with several nice algebraic properties of the tag-based lattice trapdoor and the LWE problem(such as unique witness and additive homomorphism). Compared to the best known lattice-based CCA1-secure PKE in the standard model due to Micciancio and Peikert(Eurocrypt’12), we not only directly achieve the CCA2-security without using any generic transform(and thus do not use signatures or commitments), but also reduce the noise parameter roughly by a factor of 3. This improvement makes our CCA2-secure PKE more efficient in terms of both computation and storage. In particular, when encrypting a 256-bit(respectively,512-bit) message at 128-bit(respectively, 256-bit) security, the ciphertext size of our CCA2-secure PKE is even 33%–44%(respectively, 36%–46%) smaller than that of their CCA1-secure PKE.

关键词： lattice public-key encryption chosen ciphertext security standard model

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Optimizing partitioning strategies for faster inverted index compression

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Frontiers of Computer Science 2019年第2期13卷 343-356页

作者： Xingshen SONG yuexiang YANG yu jiang Kun jiang College of Computer National University of Defense Technology Changsha 410000 China School of Electronic and Information engineering Xi'an Jiaotong University Xi'an 710000 China

The inverted index is a key component for search engines to manage billions of documents and quickly respond to users' queries. Whereas substantial effort has been devoted to reducing space occupancy and decoding speed, the encoding speed when constructing the index has been overlooked. Partitioning the index aligning to its clustered distribution can effectively minimize the compressed size while accelerating its construction procedure. In this study, we introduce compression speed as one criterion to evaluate compression techniques, and thoroughly analyze the performance of different partitioning strategies. Optimizations are also proposed to enhance state-of-the-art methods with faster compression speed and more flexibility to partition an index. Experiments show that our methods offer a much better compression speed, while retaining an excellent space occupancy and decompression speed, networks.

关键词： in verted index index compression optimal partition approximation algorithm

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Synthesis and Characterization of Aluminum Doped Nano-ZrO_2 by Surfactant-assisted Route

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Chinese Journal of Structural Chemistry 2006年第5期25卷 552-556页

作者： HU Sheng-Wei yu Jian-Chang ZHU Si-en College of Material Science and engineering Fuzhou University Fuzhou 350002 China

Recently, more and more interest has been focused on zirconia and its characteristics. In this paper, aluminum can be successfully incorporated into nano-ZrO2 via a cationic surfactant assisted route in the earlier preparation procedure. XRD, TEM, EDS, Uv-vis and N2 adsorption-desorption analysis methods were adopted for the characterization of prepared samples. The results show that aluminum has been homogeneously incorporated into nano-ZrO2. The prepared aluminum-doped samples show a distinctive blue shift in the Uv-vis spectra compared to normal nano-ZrO2. The distinctive increase of thermal stability and a mesoporous structure were observed.

关键词： nano-ZrO2 aluminum incorporation characterization

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A power adjustment based e ICIC algorithm for hyper-dense Het Nets considering the alteration of user association

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Science China(Information Sciences) 2015年第8期58卷 38-52页

作者： jiang HuiLin TONG en LI ZhiHang PHAN NhuQuan PAN ZhiWen LIU Nan National Mobile Communications Research Laboratory Southeast University

This paper evaluates power adjustment based enhanced inter-cell interference coordination(e ICIC)problem in the hyper-dense Het Net under the practical serving cell selection rule where each user selects the base station with the strongest received signal power as its serving cell while the alteration of the serving cell happens during the power adjusting process. In this paper, the e ICIC problem is solved by cooperatively adjusting the transmission power of all small cells. A power adjustment method based on modified particle swarm optimization(MPSO) is proposed to tackle the NP-hard e ICIC problem caused by the alteration of the serving cell, and considering the drawbacks of MPSO, an improved MPSO is proposed for effective *** search and multi-restart process are introduced in the improved MPSO based e ICIC algorithm to guarantee the local and then global optimality, and the convergence conditions and the global optimality are proved by mathematical deduction to guide the selection of the parameters. Simulations show that, while considering the fifty-picocell case as an example, the proposed improved MPSO based e ICIC algorithm can increase the system throughput by 66.0% compared with the full power transmission, and compared with the existing schemes which do not alter the serving cells, the proposed algorithm can improve the system throughput by 32.2%. By improving MPSO, the consequent algorithm costs less iteration time to achieve higher system throughput, and it is effective and feasible to solve the e ICIC problem in the hyper-dense Het Net.

关键词： enhanced inter-cell interference coordination hyper-dense heterogeneous networks improved modified particle swarm optimization p

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Social Sensors (S^2ensors): A Kind of Hardware-Software-Integrated Mediators for Social Manufacturing Systems Under Mass Individualization

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Chinese Journal of Mechanical engineering 2017年第5期30卷 1150-1161页

作者： Kai Ding Ping-yu jiang State Key Laboratory for Manufacturing Systems engineering Xi'an Jiaotong University

Currently, little work has been devoted to the mediators and tools for multi-role production interactions in the mass individualization environment. This paper proposes a kind of hardware-software-integrated mediators called social sensors （S2ensors） to facilitate the production interactions among customers, manufacturers, and other stakeholders in the social manufacturing systems （SMS）. The concept, classification, operational logics, and for- malization of S2ensors are clarified. S2ensors collect sub- jective data from physical sensors and objective data from sensory input in mobile Apps, merge them into meaningful information for decision-making, and finally feed the decisions back for reaction and execution. Then, an S2en- sors-Cloud platform is discussed to integrate different S2- ensors to work for SMSs in an autonomous way. A demonstrative case is studied by developing a prototype system and the results show that S2ensors and S2ensors- Cloud platform can assist multi-role stakeholders interact and collaborate for the production tasks. It reveals the mediator-enabled mechanisms and methods for production interactions among stakeholders in SMS.

关键词： Social sensors Social manufacturing system Individualized production Production interaction

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Calculation of f_(σ) on Quark Level

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Chinese Physics Letters 1996年第9期13卷 652-655页

作者： LÜXiao-fu LIU yu-xin ZHAO en-guang Department of Physics Sichuan UniversityChengdu 610064 Department of Physics Peking UniversityBeijing 100871 Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080

With the recently obtained vacuum configuration of the bilocal field,we have calculated the decay constant f_(σ) of σ-meson in a quantum chromodynamics-based model field *** investigating the calculated result,it ca... 详细信息

关键词： theory decay meson

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Deciphering fungal metabolon coupling tandem inverse-electrondemand Diels-Alder reaction and semipinacol rearrangement for the biosynthesis of spiro polycyclic alkaloids

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Science China Chemistry 2025年第01期 288-296页

作者： Shuai Liu Wen-Qiang Xu Ying-Tong Di Man-Cheng Tang Ding-Kang Chen Ming-Ming Cao Yao-Wen Chang Hong-yu Tang Chun-Mao yuan Jun-Bo Yang Zhi-Li Zuo Han Guo Zi-Fei Xu Ying Zeng yun-Dong Wu Xiao-jiang Hao Key Laboratory of Phytochemistry and Natural Medicines (Chinese Academy of Sciences) Kunming Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences Lab of Computational Chemistry and Drug Design State Key Laboratory of Chemical Oncogenomics Peking University Shenzhen Graduate School Shenzhen Bay Laboratory State Key Laboratory of Microbial Metabolism School of Life Sciences & Biotechnology Shanghai Jiao Tong University State Key Laboratory of Functions and Applications of Medicinal Plants Guizhou Medical University Molecular Biology Experimental Center Germplasm Bank of Wild Species in Southwest China Kunming Institute of Botany Chinese Academy of Sciences yunnan Key Laboratory for Wild Plant Resources Kunming Institute of Botany Chinese Academy of Sciences Research Unit of Chemical Biology of Natural Anti-Virus Products Chinese Academy of Medical Sciences

In the intricate process of natural product biosynthesis, a metabolon can enhance metabolic flux by associating sequential enzymes. A fungal metabolon, comprising of flavin-dependent monooxygenase Spe F and P450 monooxygenase Spe G, is identified in the biosynthesis of spiro polycyclic alkaloids(+)-notoamide B and its diastereomer(+)-versicolamide B. Using notoamide E as a substance, Spe F/Spe G metabolon can control the stereoselectivity of its 2,3-epoxidation, followed by hydrogen atom ion at C-17 to generate reactive epoxide tau-m A with dienyl iminium unit. Subsequently,(+)-notoamide B and(+)-versicolamide B are produced via tandem nonenzymatic inverse-electron-demand Diels-Alder reaction and semipinacol rearrangement. This provides the first example of metabolon in the biosynthesis of spiro-prenylated indole alkaloids.

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