检索结果-南通市图书馆

Diversity, distribution, and new phylogenetic information of calcareous dinoflagellates from the china Sea

在线全文

学校读者我要写书评

暂无评论

Journal of Systematics and Evolution 2011年第2期49卷 126-137页

作者： 1 Hai-Feng GU 1 Zhao-He LUO 2 Yan WANG 1 Dong-Zhao LAN 1 (Third Institute of Oceanography, Xiamen 3.1005, china) 2 (Research Center for Harmful Algae and Aquatic Environment, college of Life science and {3., jinan university, guangzhou 51063., china) (Third Institute of Oceanography Xiamen 361005 China) (Research Center for Harmful Algae and Aquatic Environment College of Life Science and Technology Jinan University Guangzhou 510632 China)

Calcareous dinoflagellates have been recorded from subarctic to tropical areas, inhabiting both neritic and oceanic regions. In the present study we analyse 12 sediment samples from the china Sea to establish the existence of calcareous dinoflagellates in this area. A total of 11 calcareous dinoflagellate species were recorded, among them, three genera (Calciodinellum, Leonella, Posoniella) and seven species (Calciodinellum albatrosianum, C. levantinum, C. operosum, Leonella granifera, Posoniella tricarinelloides, Scrippsiella irregularis, and S. regalis) were reported from the china Sea for the first time. Cysts of S. irregularis and S. precaria are identical, with a mesoepicystal archeopyle, representing the loss of 2–4 and 1–3. paraplates; however, their thecal plates vary slightly and differ from each other in 78 positions of the internal transcribed spacer sequence. Scrippsiella trochoidea is dominant in coastal areas, whereas Calciodinellum albatrosianum is the most abundant offshore. Scrippsiella irregularis is distributed widely along the coast of china, whereas S. precaria is recorded only in northern china. Leonella granifera is the second most abundant species offshore, comprising 15–40% of the cyst assemblage.

关键词： calcareous dinoflagellates Calciodinellum china Sea Leonella Posoniella Scrippsiella.

A temporal framework for building up of healthy soils

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Agricultural science and Engineering 2024年第2期11卷 292-296页

作者： Junling ZHANG Jiangzhou ZHANG Yunlong ZHANG guangzhou WANG State Key Laboratory of Nutrient Use and Management College of Resources and Environmental SciencesNational Academy of Agriculture Green DevelopmentChina Agricultural UniversityBeijing 100193China Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources College of GrasslandResources and EnvironmentInner Mongolia Agricultural UniversityHohhot 010018China Key Laboratory of Grassland Management and Utilization Ministry of Agriculture and Rural Affairs of the People’s Republic of ChinaCollege of Grassland Science and TechnologyChina Agricultural UniversityBeijing 100193China

Healthy soils are vital for the diverse services provided by ecosystems to human society~[1], such as provisioning(food,fiber, timber, and fuel), regulation(climate, disease, and natural hazards), waste treatment, nutrient cycling, and cultural services. Soil has a three phase system and the interactions between soil chemical, biological, and physical attributes determine functions(hydraulic, thermal, and gas fluxes).

关键词： soils soil cycling

Mine laneway 3. reconstruction based on photogrammetry

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2011年第S3期21卷 686-691页

作者： ZHANG Chun-sen college of Geomatics, Xi’an university of science and {3., Xi’an 710054, china college of Geomatics Xi'an University of Science and Technology Xi'an 710054 China

Aiming at the problem of 3. reconstruction for mine laneway, the technique route and step were given based on digital close range photogrammetry and traverse surveying. 3. coordinates of laneway traverse point, photogrammetric station, control strip points were obtained by electronic total station based on mine coordinate system. The feature points were extracted from the scene images. The camera was calibrated by direct linear transformation (DLT). 3. relative coordinates of the arbitrary feature points in mine laneway were calculated after feature points being matched, in which the origin of coordinate system is photogrammetric station. The 3. absolute coordinates of the feature points in mine laneway can be obtained by the combined adjustment of photogrammetry and non-photogrammetric observations and coordinate conversion. The measurable 3. model of the underground laneway terrain surface was constructed with the 3. coordinates of feature points on the image pairs obtained. The measurable 3. model of a corridor was reconstructed by the mentioned method and the experiment precision with an average standard deviation of 0.013.6 m between the 3. model and practical measure was obtained by electronic total station. The experimental resulted show the validity of the proposed approach.

关键词： digital mine mine laneway photogrammetry 3. reconstruction direct linear transformation (DLT)

Electron microscopy study of the sakhaite from endogenous borate deposit in Hunan, china

在线全文

学校读者我要写书评

暂无评论

science china Earth sciences 2004年第3期47卷 232-238页

作者： LIU Xiangwen1,2, YANG Guangming2, ZOU Huamin3. QU Jing1 & ZHAO Wenxia4 1. Graduate School, china university of Geosciences, Wuhan 43.074, china 2. Test Center, china university of Geosciences, Wuhan 43.074, china 3. Physics and technology college, Wuhan university, Wuhan 43.072, china 4. Test Center, Zhongshan university, {13. 510275, china Graduate School China University of Geosciences Wuhan 430074 China Test Center China University of Geosciences Wuhan 430074 China Physics and technology college Wuhan University Wuhan 430072 China Test Center Zhongshan University Guangzhou 510275 China

Sakhaite specimens from an endogenous borate deposit in Hunan Province, china have been studied in detail by means of transmission electron microscopy (TEM). The selected area electron diffraction (SAED) patterns obtained with different crystal zone axes show that the crystal system is cubic, with a = 1.463.nm. The convergent beam electron diffraction (CBED) patterns indicate that the point group and space group of sakhaite is m3. and Fd3., respec-tively. The space group of synthetic sakhaite determined by Chichagov (1974) is F413.. The possible reasons why the space groups of the natural and the synthetic sakhaites are different are discussed.

关键词： sakhaite, space group, convergent beam electron diffraction (CBED).

Influence of valence electron structures of phase and biphase interfaces of sulfides on hot brittleness in steel

在线全文

学校读者我要写书评

暂无评论

science china(Technological sciences) 2004年第4期47卷 488-504页

作者： LIU Yan1,3. LIU Zhilin1, ZHANG Chengwei1,2 & ZHOU Yingchun1 1. Liaoning Institute of technology, Jinzhou 121001, china 2. china National Oil and Gas Exploration and Development Corporation, Beijing 100011, china 3. college of science, Northeastern university, Shengyang 110006, china Liaoning Institute of technology Jinzhou China college of science Northeastern University Shengyang China china National Oil and Gas Exploration and Development Corporation Beijing China

This paper calculates the electron structures of phase of FeS, MnS and their biphase interface electron structures with austenite in steel. The precipitation and the transformation of FeS and MnS are investigated through studying the valence electron pair numbers on the strongest bond n A with the structure formation factor S. The continuity of electron density and its relation with stress are explored in the biphase interfaces with the electron density difference απ Using n A, S, απ we explain the reason why FeS can bring about hot brittleness in steel and the physical mechanism why MnS may eliminate or inhibit hot brittleness, based on which satisfying results are obtained by calculating several rare-earth sulfides.

关键词： valence electron structure, sulfide, hot brittleness, and rare earth.

Inhibition of ethanol-induced toxicity by tanshinone ⅡA in PC12 cells

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2006年第6期27卷 659-664页

作者： Xian-fang MENG~2 Xiao-jing ZOU~3.Bin PENG~2 Jing SHI~2 Xin-min GUAN~2 Chun ZHANG~(4,5)2 Department of Neurobiology,Tongji Medical college,Huazhong university of science and {3.,Wuhan 43.03.,china 3.Department of Anesthesiology,4 Department of Nephrology,Union Hospital,Tongji Medical college,Huazhong university of science and {3.,Wuhan 43.022.china Department of Neurobiology Tongji Medical College Huazhong University of Science and Technology Wuhan China Department of Anesthesiology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China Department of Nephrology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China

Aim:To observe the effects of tanshinone IIA(Tan IIA)on the neurotoxicityinduced by ethanol in PC 12 cells and to explore its protective ***:PC 12cell survival was measured by MTT *** formation of reactive oxygenspecies(ROS)and lactate dehydrogenase(LDH)release were detected by 2′,7′-dichlorofluorescin(DCF)fluorescence and calorimetric method,*** of cell apoptosis was monitored by flow *** expression ofp53.was detected by immuno-fluorescence and flow ***:Ethanolsignificantly impaired the survival of PC12 cells as demonstrated by MTT *** also induced significant ROS formation and increased LDH ***-incubation with Tan IIA in the culture medium significantly reversed these *** caused cell apoptosis and the upregulation of p53.*** anti-apoptosis effects of Tan IIA on ethanol-induced toxicity were accompanied by thedownregulation of pro-apoptotic p53.protein ***:Tan IIAcan protect neurons from apoptosis and might serve as a potential therapeuticdrug for neurological disorders induced by ethanol.

关键词： apoptosis ethanol PC12 cells p53 tanshinone ⅡA

Threshold quantum secure direct communication without entanglement

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Physics,Mechanics & Astronomy) 2008年第2期51卷 176-183页

作者： YANG YuGuang1,3.& WEN QiaoYan2 1 college of Computer science and technology, Beijing {3. of technology, Beijing 100022, china 2 School of science, Beijing {3. of Posts and Telecommunications, Beijing 100876, china 3.State Key Laboratory of Information Security (Graduate School of Chinese Academy of sciences), Beijing 100049, china college of Computer science and technology Beijing University of Technology Beijing China State Key Laboratory of Information Security (Graduate School of Chinese Academy of sciences) Beijing China School of science Beijing University of Posts and Telecommunications Beijing China

For the first time, a threshold quantum secure direct communication (TQSDC) scheme is presented. Similar to the classical Shamir's secret sharing scheme, the sender makes n shares, S1, …, Sn of secret key K and each receiver keeps a share secretly. If the sender wants to send a secret message M to the receivers, he en-codes the information of K and M on a single photon sequence and sends it to one of the receivers. According to the secret shares, the t receivers sequentially per-form the corresponding unitary operations on the single photon sequence and ob-tain the secret message M. The shared shares may be reusable if it can be judged that there is no eavesdropper in line. We discuss that our protocol is feasible with current technology.

关键词： quantum secure direct communication threshold secure direct communication quantum secret sharing

Twisted Ate pairing on hyperelliptic curves and applications

在线全文

学校读者我要写书评

暂无评论

science china(Information sciences) 2010年第8期53卷 1528-1538页

作者： ZHANG FangGuo 1,2 1 School of Information science and technology, Sun Yat-Sen university, {3. 510275, china 2 Guangdong Key Laboratory of Information Security technology, {3. 510275, china School of Information science and technology Sun Yat-Sen University Guangzhou China Guangdong Key Laboratory of Information Security technology Guangzhou China

In this paper we show that the twisted Ate pairing on elliptic curves can be generalized to hyperelliptic curves, and give a series of variations of the hyperelliptic Ate and twisted Ate pairings. Using the hyperelliptic Ate pairing and twisted Ate pairing, we propose a new approach to speeding up the Weil pairing computation. For some hyperelliptic curves with high degree twist, computing Weil pairing by our approach may be faster than Tate pairing, Ate pairing, and all other known pairings.

关键词： Ate pairing Weil pairing hyperelliptic curves pairing-based cryptosystems twisted curves

The structural analysis of fuzzy measures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science china(Information sciences) 2011年第1期54卷 38-50页

作者： ZHANG Ling1,ZHANG Bo2 & ZHANG YanPing1 1 Computer science college,Anhui university,Hefei 23.03.,{3. 2State Key Lab of Intelligent technology & Systems Tsinghua National Lab for Information science & technology Information science & technology college,Computer science & technology,Tsinghua university,Beijing 100084,{3. Computer science college Anhui University Hefei China State Key Lab of Intelligent technology & Systems Tsinghua National Lab for Information science & technology Information science & technology college Computer Science & Technology Tsinghua University Beijing China

From quotient space based granular computing theory we explore the fuzzy measures of fuzzy sets. Based on the structural analysis of fuzzy sets,we present an"isotropism"*** this assumption we achieved the following insights:(1)the uniqueness of a fuzzy measure being isotropic on a finite complete semi-ordered set;(2)the necessary and suffcient condition of the isomorphism for fuzzy measure functions in fuzzy mathematics;(3.the necessary and suffcient condition that fuzzy measures have fuzzy and granular monotonicity;(4)under a certain assumption,the analytic expression for fuzzy *** results clarify the relationship between fuzzy measures and granular computing,reveal the essence of fuzzy measures,and provide a simple way of constructing fuzzy measures.

关键词： quotient space fuzzy set fuzzy measure rough set structural analysis