检索结果-南通市图书馆

Lithospheric structure and evolution of the North China Craton:An integrated study of geophysical and xenolith data

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2021年第2期64卷 205-219页

作者： Jianping ZHENG bing xia Hongkun DAI Qiang MA School of Earth Sciences State Key Laboratory of Geological Processes and Mineral ResourcesChina University of GeosciencesWuhan 430074China State Key Laboratory of Lithospheric Evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China

Determination of the physical and chemical structures of the inaccessible continental lithosphere by comprehensive geophysical and geochemical studies can provide valuable information on its formation and *** studies from various disciplines have revealed complex lithospheric modification of the North China Craton(NCC),but less attention has been paid to an integrated study from different *** we provide an integrated constraint on the lithospheric mantle structure of the NCC by comprehensive semiology,gravity and thermal studies with xenolith data involving depth(levels in the lithosphere),property(chemical and physical),and timing(formation and reworking ages).Our results suggest that the NCC has a relatively heterogeneous lithospheric *** margins and internal weak zones,especially in the eastern NCC,are generally underlain by the fertile,weakly metasomatized mantle with generally young formation *** contrast,its core tends to preserve the refractory,strongly metasomatized mantle with ages roughly coupled to the overlying Archean *** a lithospheric structure shows the preferential modification of the lithospheric mantle in the eastern NCC and in the peripheral regions of the western *** interior of the craton,especially most of the western NCC,remains stable and has been weakly modified.

关键词： Lithospheric thermal and density structure Peridotite xenolith Heterogeneous mantle replacement North China Craton

New method for high performance multiply-accumulator design

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第7期10卷 1067-1074页

作者： bing-jie xia Peng LIU Qing-dong YAO Department of Information Science and Electronic Engineering Zhejiang University Hangzhou 310027 China

This study presents a new method of 4-pipelined high-performance split multiply-accumulator (MAC) architecture, which is capable of supporting multiple precisions developed for media processors. To speed up the design further, a novel partial product compression circuit based on interleaved adders and a modified hybrid partial product reduction tree (PPRT) scheme are proposed. The MAC can perform 1-way 32-bit, 4-way 16-bit signed/unsigned multiply or multiply-accumulate operations and 2-way parallel multiply add (PMADD) operations at a high frequency of 1.25 GHz under worst-case conditions and 1.67 GHz under typical-case conditions, respectively. Compared with the MAC in 32-bit microprocessor without interlocked piped stages (MIPS), the proposed design shows a great advantage in speed. Moreover, an improvement of up to 32% in throughput is achieved. The MAC design has been fabricated with Taiwan Semiconductor Manufacturing Company (TSMC) 90-nm CMOS standard cell technology and has passed a functional test.

关键词： Multiply-accumulator (MAC) Pipeline Compressor Partial product reduction tree (PPRT) Split structure

Physical design method of MPSoC

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第4期8卷 631-637页

作者： LIU Peng xia bing-jie TENG Zhao-wei Department of Information Science ＆ Electronic Engineering Zhejiang University Hangzhou 310027 China

Floorplan, clock network and power plan are crucial steps in deep sub-micron system-on-chip design. A novel di- agonal floorplan is integrated to enhance the data sharing between different cores in system-on-chip. Custom clock network con- taining hand-adjusted buffers and variable routing rules is constructed to realize balanced synchronization. Effective power plan considering both IR drop and electromigration achieves high utilization and maintains power integrity in our MediaSoC. Using such methods, deep sub-micron design challenges are managed under a fast prototyping methodology, which greatly shortens the design cycle.

关键词： Physical design Fast prototyping Floorplan Clock tree synthesis (CTS) Power plan Multiprocessor system-onchip (MPSoC)

Inflammatory bowel disease:definition,epidemiology,etiologic aspects,andimmunogenetic studies

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 1998年第5期4卷 83-95页

作者： xia bing JBA Crusius SGM Meuwissen AS Pe a Department of Gastroenterology The Second Affiliated HospitalHubei Medical UniversityWuhan 430071China Laboratory of Gastrointest in al Immunogenetics Medical FacultyFree University Ams terdam1081 BT Ams terdamThe Ne therlands

The etiology of IBD remains unclear. Environmental factors, a genetic predisposition and a disturbed immunological response all contribute to the development of the disease. Even though pathogens have not been identified as a cause of IBD, persistent infections are highly suspected, including Mycobacterium paratuberculosis and measles virus in CD, and an unknown bacterial infection and/ or bacterial products in UC. Smoking has been suggested to be a strong risk factor in CD, and in determining the clinical course of UC and CD. Disturbances of the mucosal immune system and an imbalance of immune regulation presented by cellular and/ or humoral abnormalities as well as functions of pro-inflammatory cytokines and anti-inflammatory cytokines, and other mediators were observed in IBD patients and are considered to be fundamental to the pathogenesis of IBD. Because of the multiplicity and complexity of the interactions of all these elements, it is difficult to distinguish between primary and secondary, and pathogenic and non-pathogenic phenomena[248]. With the development of transgenic and knockout rodent models, it is possible to define the critical immune elements necessary to develop IBD. Recent studies demonstrated that mucosal homeostasis is important and a defective mucosal barrier may allow unrestrained uptake of luminal antigens and pro-inflammatory molecules and thus initiate immune responses. Some evidence for an imbalance of pro-and anti-inflammatory cytokines and of Th1/Th2 lymphocytes have been found in chronic intestinal inflammation. pANCA are present in more than 70% of UC patients, but their role as a subclinical marker of UC needs to be confirmed. As to genetic factors, epidemiological studies have demonstrated the influence of genetic factors on the development of IBD by phenomena such as ethnic variations, familial aggregation, monozygotic twins versus dizygotic twins, and first degree relatives versus spouses. A genetic influence weights mo

关键词： inflammatory bowel disease/epidemiology inflammatory bowel disease/etiology inflammatory bowel disease/genetics inflammatory bowel disease/immunology

Jet Vectoring Control Using a Novel Synthetic Jet Actuator

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2007年第3期20卷 193-201页

作者： LUO Zhen-bing xia Zhi-xun XIE Yong-gao College of Aerospace and Materials Engineering National University of Defense Technology Changsha 410073 China

A primary air jet vectoring control system with a novel synthetic jet actuator （SJA） is presented and simulated numerically. The results show that, in comparison with an existing traditional synthetic jet actuator, which is able to perform the duty of either ＂push＂ or ＂pull＂, one novel synthetic jet actuator can fulfill both ＂push＂ and ＂pull＂ functions to vector the primary jet by shifting a slide block inside it. Therefore, because the new actuator possesses greater efficiency, it has potentiality to replace the existing one in various appli- cations, such as thrust vectoring and the reduction of thermal signature. Moreover, as the novel actuator can fulfill those functions that the existing one can not, it may well be expected to popularize it into more flow control systems.

关键词： jet vectoring control synthetic jet actuator slide block flow control

Two new cyclic diarylheptanoids from the stems of Ostryopsis nobilis

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2013年第6期24卷 512-514页

作者： Yan-xia Zhang bing xia Yan Zhou Li-Sheng Ding Shu-Lin Peng Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization Chengdu Institute of BiologyChinese Academy of Sciences

Two new cyclic diarylheptanoids named ostryopsitrienol（1） and ostryopsitriol（2）,together with six known compounds,were isolated from the stems of endemic medicinal plant of Ostryopsis nobilis （Betulaceae）.The st... 详细信息

关键词： Ostryopsis nobilis Cyclic diarylheptanoid Ostryopsitrienol Ostryopsitriol

Removal of copper ions from aqueous solution by calcium alginate immobilized kaolin

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2011年第3期23卷 404-411页

作者： Yanhui Li bing xia Quansheng Zhao Fuqiang Liu Pan Zhang Qiuju Du DechangWang Da Li ZonghuaWang Yanzhi xia Laboratory of Fiber Materials and Modern Textile The Growing Base for State Key Laboratory Qingdao University Qingdao 266071 China Department of Environmental Science and Engineering Qingdao University Qingdao 266071 China

Kaolin has been widely used as an adsorbent to remove heavy metal ions from aqueous solutions. However, the lower heavy metal adsorption capacity of kaolin limits its practical application. A novel environmental friendly material, calcium alginate immobilized kaolin （kaolin/CA）, was prepared using a sol-gel method. The effects of contact time, pH, adsorbent dose, and temperature on Cu2＋ adsorption by kaolin/CA were investigated. The Langmuir isotherm was used to describe the experimental adsorption, the maximum Cu2＋ adsorption capacity of the kaolin/CA reached up to 53.63 mg/g. The thermodynamic studies showed that the adsorption reaction was a spontaneous and endothermic process.

关键词： kaolin calcium alginate copper adsorption, immobilization

Water migration in subgrade soil under seasonal freeze-thaw cycles in an alpine meadow on the Qinghai-Tibet Plateau

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2022年第6期19卷 1767-1781页

作者： WU Guan-qing XIE Yong-li WEI Jin YUE xia-bing School of Highway Chang'an UniversityXi'an 710064China

Highway frost heave and thawing settlement caused by water migration towards the freezing front and ice lens development is widespread in the alpine meadow area of the southeast QinghaiTibet Plateau(QTP). A laboratory experiment on a highway reconstruction and expansion project in the QTP was carried out in this work to analyze the effects of fine particle content, initial water content, and the number of freeze-thaw cycles(FTCs) on frost depth, temperature gradient(Grad T), total water intake, and water intake flux. Based on the results of the laboratory experiment, a modified model of migration potential related to fine particle content, freeze-thaw history, and freezing time was established. The results show that, with the increase of fine particle content, the frost depth of soil decreases, the curve of total water intake over time is transformed from an Sshape to an arch, and the curve of water intake flux over time is transformed from a peak shape to descending shape. The variation trend of migration potential with freezing time and the freeze-thaw history is the same as that of water intake flux with freezing time and freeze-thaw history. The variation trend of soil intake flux can be used as a reference to determine the variation trend of soil migration potential. This study provides a reference for the design and construction of highway subgrade in the alpine meadow area of the QTP.

关键词： Water migration Seasonally frozen ground Freeze-thaw cycles Laboratory experiment Migration potential model Qinghai-Tibet Plateau

Heat stress-induced mucosal barrier dysfunction is potentially associated with gut microbiota dysbiosis in pigs

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2022年第1期8卷 289-299页

作者： bing xia Weida Wu Wei Fang xiaobin Wen Jingjing Xie Hongfu Zhang State Key Laboratory of Animal Nutrition Institute of Animal SciencesChinese Academy of Agricultural SciencesBeijing100193China Institute of Quality Standard and Testing Technology for Agro-Products Key Laboratory of Agro-Product Quality and SafetyChinese Academy of Agricultural SciencesBeijing100081China Academy of State Administration of Grain Beijing100037China

Heat stress(HS)can be detrimental to the gut health of *** negative outcomes induced by HS are increasingly recognized as including modulation of intestinal *** turn,the intestinal microbiota is a unique ecosystem playing a critical role in mediating the host stress ***,we aimed to characterize gut microbiota of pigs’exposure to short-term HS,to explore a possible link between the intestinal microbiota and HS-related changes,including serum cytokines,oxidation status,and intestinal epithelial barrier *** findings showed that HS led to intestinal morphological and integrity changes(villus height,serum diamine oxidase[DAO],serum D-lactate and the relative expressions of tight junction proteins),reduction of serum cytokines(interleukin[IL]-8,IL-12,interferongamma[IFN-g]),and antioxidant activity(higher glutathione[GSH]and malondialdehyde[MDA]content,and lower superoxide dismutase[SOD]).Also,16S rRNA sequencing analysis revealed that although there was no difference in microbial a-diversity,some HS-associated composition differences were revealed in the ileum and cecum,which partly led to an imbalance in the production of short-chain fatty acids including propionate acid and valerate *** networks revealed that HS-derived changes in bacterial genera and microbial metabolites,such as Chlamydia,Lactobacillus,Succinivibrio,Bifidobacterium,Lachnoclostridium,and propionic acid,were correlated with oxidative stress,intestinal barrier dysfunction,and inflammation in ***,our observations suggest that intestinal damage induced by HS is probably partly related to the gut microbiota dysbiosis,though the underlying mechanism remains to be fully elucidated.

关键词： Pig Heat stress Intestinal mucosal barrier Bacterial signature Microbeehost interaction