检索结果-南通市图书馆

Recent developments in plastic forming technology of titanium alloys

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(Technological Sciences) 2011年第2期54卷 490-501页

作者： YANG He FAN XiaoGuang sun zhichao GUO LiangGang ZHAN Mei State Key Laboratory of Solidificatio. Processing School of Materials Sciece a.d E.gineering. Northwestern Polytechnical University Xi'an 710072 China

Titanium alloys have been used extensively in industry fields including aviation,aerospace and automobile due to their excellent comprehensive *** and development of advanced plastic forming technology are of great importance to manufacturing titanium products of high performance and lightweight with low cost and short *** paper analyzes the development tendencies of titanium alloy forming *** achievements in precision forming,microstructure control and multi-scale simulation of titanium alloys are *** forming techniques of large-sale integral complex components are presented.

关键词： titanium alloys precision forming microstructure control multi-scale simulation large-scale integral complex components

Performance Evaluation of the Halophilic Crude Oildegrading Bacterial Consortium XH-1 for Oilfield Wastewater Treatment

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2024年第3期26卷 24-32页

作者： Gong Xihui Zhang Manlin Wang Wenna sun zhichao Liu Chunshuang College of Chemistry and Chemical Engineering China University of Petroleum(East China)Qingdao 266580China

A total of 14 halophilic hydrocarbon-degrading strains were isolated from crude oil-contaminated sites,using petroleum as the sole carbon and energy *** these,four highly efficient strains were selected to create the mixed bacterial agent *** four strains were identified through 16S rRNA gene-based sequencing as belonging to Acinetobacter,Bacillus paramycoides,Rhodococcus sp.,and Enterobacter sp.,*** optimal cultivation time for the mixed consortium XH-1 was found to be 48 h,and a nitrogen-phosphorus molar ratio of 10:1 was determined to be beneficial for crude oil ***-1 showed notable crude oil degradation even at a salinity of up to 30 g/L,with little inhibition observed at sulfide concentrations as high as 150 mg/L and initial oil concentrations of 500 mg/*** chromatography analysis revealed that XH-1 was able to efficiently degrade C9–C29 ***,a bio-contact oxidation reactor enhanced by XH-1 showed promising results in treating oilfield *** findings suggest that XH-1 can be applied for the treatment of oilfield wastewater.

关键词： crude oil degradation mixed strains oilfield wastewater degradation characteristics

In Silico search and biological validation of MicroR171 family related to abiotic stress response in mulberry(Morus alba)

在线全文

学校读者我要写书评

暂无评论

Horticultural Plant Journal 2022年第2期8卷 184-194页

作者： zhichao sun R.M.Saravana Kumar Jisheng Li Guiming Yang Yan Xie Hebei Universities R&D Center for Sericulture and Specialty Enabling Technologies Chengde 067000China Sericultural Research Insitute Chengde Medical UniversityChengde 067000China

miR171 belongs to a highly conserved and ubiquitously expressed micro RNA gene family across species that play a critical role in controlling plant growth and development through the regulation of the miR171-SCL(scarecrow-like proteins)*** is limited research available on the evolutionary relationship and functional diversification of miR171 *** this study,we identified eight miR171 genes in the mulberry genome by bioinformatics analysis that were subsequently used to compare the evolutionary levels and explore abiotic stress mechanisms mediated by mno-miR171s(Morus notabilis miR171s).The results of phylogenetic analysis showed that the mature mno-miR171 sequences have strong sequence conservation,but their critical sites also exhibit high variation leading to functional *** quantitative real-time PCR,the expression profile of each mno-miR171 was analyzed under different stress *** mno-miR171s,apart from mnomiR171h,were found to be significantly up-regulated under salt and drought stress *** target genes of mno-miR171a namely,Morus020885 and Morus011800,were predicted and verified using the plural RNA method.5-rapid amplification of complementary DNA ends assays further to reveal that the target genes could be degraded by mno-miR171a *** of mno-miR171a in Arabidopsis improved the percentage of seed germination when the seeds were grown in NaCl-and mannitol-containing *** plants were observed to grow better under drought *** expression of various stress genes was significantly higher in transgenic plants than in wild type,except *** together,our study confirmed that mno-miR171a enhanced plant resistance to adverse stress environments via the regulation of the SCL targets.

关键词： Mulberry miR171 qRT-PCR SCL Arabidopsis Stress

Recent progress on impact induced reaction mechanism of reactive alloys

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第7期37卷 69-95页

作者： Yansong Yang Chuanting Wang Yuanpei Meng Yue Ma Lei Guo Yuan He zhichao sun Yong He School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094JiangsuChina

In recent years,in order to improve the destructive effectiveness of munitions,the use of new types of destructive elements is an important way to improve destructive *** a new type of reactive material,reactive alloy contains a large portion of reactive metal elements(Al,Mg,Ti,Zr,etc.),which breaks up under high-velocity impact conditions,generating a large number of high-temperature combustible fragments,which undergo a violent combustion reaction with *** with traditional metal polymers(Al-PTFE)and other reactive composites,it has higher density and strength,excellent mechanical properties and broader application ***,researchers have mainly investigated the impact energy release mechanism of reactive alloys through impact tests,and found that there are several important stages in the process of the material from fragmentation to reaction,i.e.,impact fragmentation of the material,rapid heating and combustion *** paper focuses on three problems that need to be solved in the impact-induced energy release process of reactive alloys,namely:the fragmentation mechanism and size distribution law of the fragments produced by the impact of the material on the target,the relationship between the transient temperatures and the size of the fragments,and the reaction temperatures and size thresholds of the fragments to undergo the chemical *** current status of the research of the above problems is reviewed,some potential directions to reveal the impact induced reaction mechanism of reactive alloy is discussed.

关键词： Reactive alloys Impact Fragmentation Mass and size distribution Shock temperature rise Adiabatic shear Combustion

Effect of Deformation Condition on Axial Compressive Precision Forming Process of Tube with Curling Die

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2001年第1期17卷 135-136页

作者： He YANG and zhichao sun College of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China NW Polytech Univ Coll Mat Sci & Engn Xian 710072 Peoples R China

The effect of the deformation condition on the axial compressive precision forming process of tube with curling die was investigated by using a rigid-plastic FEM. The results show that the forming accuracy depends mainly on geometric condition rp/d0, little on tube material properties and friction condition; the relative gap △/2rp of double-walled tubes obtained decreases with Increasing rp/d0, and there is a parameter k for a given to/do or rp/t0, when rp/d0 >k, △/2rp1.

关键词： Effect of Deformation Condition on Axial Compressive Precision Forming Process of Tube with Curling Die

Minor-effect QTL for heading date detected in crosses between indica rice cultivar Teqing and near isogenic lines of IR24

在线全文

学校读者我要写书评

暂无评论

The Crop Journal 2018年第3期6卷 291-298页

作者： zhichao sun Yujun Zhu Junyu Chen Hui Zhang Zhenhua Zhang Xiaojun Niu Yeyang Fan Jieyun Zhuang State Key Laboratory of Rice Biology and Chinese National Center for Rice Improvement China National Rice Research Institute College of Crop Science Fujian Agriculture and Forestry University Rice Research Institute Fujian Academy of Agricultural Sciences

Identification of quantitative trait loci(QTL) having small effects on heading date(HD) is important for fine-tuning flowering time in rice(Oryza sativa L.). In this study, minor-effect QTL for HD were identified using five segregating rice populations, including a recombinant inbred line population derived from crosses between indica cultivar Teqing and near isogenic lines of IR24,and four populations derived from residual heterozygotes identified in the original *** data from these populations were obtained in multiple years or at two locations with different photoperiods. A total of 11 QTL were detected; they had small additive effects ranging from 0.21 to1.63 days. The QTL were all detected in different populations, locations and/or years, having consistent allelic effects across experiments and a stable magnitude across years at the same location. These QTL, and other minor-effect QTL that have been cloned or fine-mapped, generally do not have strong photoperiod sensitivity, and thus can be used in a wide range of ecogeographical conditions. Seven of the 11 QTL were different from those that have been cloned or fine-mapped, providing new candidates for gene cloning and marker-assisted breeding. Allelic effects of QTL corresponding to those that had been cloned or fine-mapped, were much smaller in this study than previously reported. The results supported the assumption that qualitative and quantitative genes may be different alleles at the same loci, suggesting that it may be promising to identify minor-effect QTL from major heading date genes/QTL that have been cloned.

关键词： Growth rate Oryza sativa Quantitative trait locus Residual heterozygosity

Overexpression of PvWOX3a in switchgrass promotes stem development and increases plant height

在线全文

学校读者我要写书评

暂无评论

Horticulture Research 2021年第1期8卷 3506-3519页

作者： Ruijuan Yang Zhenying Wu Chen Bai zhichao sun Mengqi Wang Yuzhu Huo Hailing Zhang Yamei Wang Huapeng Zhou Shaojun Dai Wenwen Liu Chunxiang Fu Shandong Provincial Key Laboratory of Energy Genetics and CAS Key Laboratory of Biofuels Qingdao Institute of Bioenergy and Bioprocess TechnologyChinese Academy of Sciences266101 QingdaoShandongChina University of Chinese Academy of Sciences 100049 BeijingChina Shanghai Normal University 201418 ShanghaiChina Grass and Science Institute of Heilongjiang Academy of Agricultural Sciences HarbinHeilongjiangChina Key Laboratory of Bio-resource and Eco-environment of Ministry of Education College of Life SciencesSichuan University610064 ChengduChina

Switchgrass(Panicum virgatum L.)is an important perennial,noninvasive,tall ornamental grass that adds color and texture to gardens and ***,switchgrass has been considered a forage and bioenergy crop because of its vigorous growth,low-input requirements,and broad ***,we identified PvWOX3a from switchgrass,which encodes a WUSCHEL-related homeobox transcription *** overexpression of PvWOX3a in switchgrass increased stem length,internode diameter,and leaf blade length and width,all of which contributed to a 95%average increase in dry weight biomass compared with control *** one-hybrid and transient dual-luciferase assays showed that PvWOX3a can repress the expression of gibberellin 2-oxidase and cytokinin oxidase/dehydrogenase through apparently direct interaction with their promoter *** results suggested that overexpression of PvWOX3a could increase gibberellin and cytokinin levels in transgenic switchgrass plants,which promotes cell division,elongation,and vascular bundle *** also overexpressed PvWOX3a in a transgenic miR156-overexpressing switchgrass line that characteristically exhibited more tillers,thinner internodes,and narrower leaf *** transgenic switchgrass plants displayed significant increases in internode length and diameter,leaf blade width,and plant height but retained a tiller number comparable to that of plants expressing miR156 ***,the double transgenic switchgrass plants produced 174%more dry-weight biomass and 162%more solubilized sugars on average than control *** findings indicated that PvWOX3a is a viable potential genetic target for engineering improved shoot architecture and biomass yield of horticulture,fodder,and biofuel crops.

关键词： expressing blade landscape

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

大型钛合金隔框等温闭式模锻成形工艺优化

稀有金属材料与工程 2009年第7期38卷 1296-1300页

作者：孙念光杨合孙志超西北工业大学陕西西安710072

大型钛合金隔框锻件外形复杂,且要求尺寸精度高、内部质量稳定,然而在锻造过程中极易出现充填不满、折迭、流线紊乱等缺陷。针对这些成形缺陷,基于DEFORM有限元软件,采用数值模拟方法研究钛合金等温闭式模锻成形过程坯料和加载方式优化... 详细信息

大型钛合金隔框锻件外形复杂,且要求尺寸精度高、内部质量稳定,然而在锻造过程中极易出现充填不满、折迭、流线紊乱等缺陷。针对这些成形缺陷,基于DEFORM有限元软件,采用数值模拟方法研究钛合金等温闭式模锻成形过程坯料和加载方式优化对锻件成形质量的影响。研究表明:基于隔框材料流动特性优化得到的不等厚坯料,能较好地改善材料的充填性,使锻件满足尺寸精度要求。而局部加载方式可以有效地控制材料的流动,提高锻件的变形均匀性,消除由于材料流动不良造成的成形缺陷。

关键词：钛合金隔框坯料优化加载方式成形缺陷数值模拟

The Lower Cambrian Xiaoerbulake Formation in the Tarim Basin as a potential carbonate source rock

在线全文

学校读者我要写书评

暂无评论

Energy Geoscience 2024年第2期5卷 40-52页

作者： Miaoqing Miao zhichao sun Zongan Xue Miao Miao Kunpeng Jiang Xuefeng Zhang Zhongkai Bai Xiuxiang Lyu Xingui Zhou Yongjin Gao Miao Han Youxing Yang Oil and Gas Survey CGSBeijing100083China School of Earth and Space Sciences Peking UniversityBeijing100871China Institute of Energy Peking UniversityBeijing100871China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China School of GeoSciences China University of Petroleum(Beijing)Beijing102249China

The oil and gas exploration of the Middle and Lower Cambrian in the Tarim Basin reveals widely distributed source rocks with the Yuertusi Formation being recognized as high-quality source rocks that are distributed in a rather small *** Xiaoerbulake Formation that is right under the Yuertusi Formation has also been eyed as potential high-quality source rocks and is studied through analyses focusing on the stratigraphic development,the abundance,type,and maturity of organic matter,and the paleoproductivity of a dark-colored algae dolomite within the *** results show that the dolomite is rich in organic matter of mainly types Ⅰ and Ⅱ *** reached the high mature to over-mature stage,the dolomite was deposited in an anoxic sedimentary environment featuring a high paleoproductivity level and a high organic carbon burial efficiency,quite favorable for the development of high-quality source *** study provides material evidence to the Middle-Lower Cambrian subsalt source rock-reservoir-caprock combination model for the Tarim Basin.

关键词： Source rock Algal dolomite Yuertusi formation Xiaoerbulake formation Tarim basin