环和
环和的相关文献在1984年到2023年内共计169401篇,主要集中在数学、化学、化学工业
等领域,其中期刊论文74篇、会议论文1篇、专利文献169326篇;相关期刊61种,包括新闻爱好者、体育文化导刊、武汉理工大学学报(交通科学与工程版)等;
相关会议1种,包括2006年中国西部地区信息技术学术研讨会等;环和的相关文献由50000位作者贡献,包括不公告发明人、张伟、王伟等。
环和—发文量
专利文献>
论文:169326篇
占比:99.96%
总计:169401篇
环和
-研究学者
- 不公告发明人
- 张伟
- 王伟
- 王磊
- 张涛
- 王勇
- 李伟
- 刘洋
- 刘伟
- 王涛
- 商建忠
- 张磊
- 王超
- 张勇
- 王斌
- 李明
- 李强
- 王强
- 李涛
- 王刚
- 王鹏
- 林民
- 张斌
- 张杰
- 赵明
- 刘涛
- 王辉
- 李斌
- 王军
- 郭志东
- 刘鹏
- 李军
- 陈伟
- 杨军
- 朱斌
- 李刚
- 华林
- 张军
- 李杰
- 潘杰
- 刘斌
- 姚力军
- 商晶晶
- 刘强
- 张波
- 张健
- 李鹏
- 刘刚
- 李静
- 李波
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无1
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摘要:
我国消费市场规模位居世界前列,新增消费空间广阔。随着新技术快捷发展,新产品不断涌现,更新消费潜力巨大。为深入贯彻中央经济工作会议精神和政府工作报告要求,加快落实《中共中央国务院关于完善促进消费体制机制进一步激发居民消费潜力的若干意见》(中发〔2018〕32号)和《国务院办公厅关于印发完善促进消费体制机制实施方案(2018-2020年)的通知》(国办发〔2018〕93号),国家发展改革委、生态环境部、商务部印发《推动重点消费品更新升级畅通资源循环利用实施方案(2019-2020年)》。
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摘要:
本发明公开了一种碳纤维集束试样及其制备方法,采用对扣的两个半圆环形成约束环约束碳纤维集束,能够得到精确的体积密度和外形尺寸。该碳纤维集束试样包括:约束环和碳纤维集束;约束环包括:上约束环和下约束环;上约束环和下约束环为两个卡扣形式的半圆环,其对接后形成一个整圆,圆柱形的碳纤维集束约束在约束环内。制备该碳纤维集束试样时,先计算所需碳纤维的质量M,然后称取质量为M的待测碳纤维,轴向平行集束形成圆柱状的碳纤维集束;拉直碳纤维集束后,将上约束环和下约束环分别从碳纤维集束外圆周相对的两个方向扣接在一起形成约束环,将碳纤维集束约束在约束环内;最后对伸出约束环两端的碳纤维集束进行切边,得到碳纤维集束试样。
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郭要红
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摘要:
问题设R、s分别是△ABC的外接圆半径、半周长,证明:sinA/2sinB/2sinC/2·∑(sin/A+sin/B)^2/sin/C≤s/2R,其中∑表示循环和.第一位正确解答者将获得奖金100元.擂题提供与解答请电邮至guoyaohong1108@163.com,解答认定时间以电子邮件时间为准.欢迎广大读者踊跃提供擂题.
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ZHAO Wei;
MA Jinzhu;
GU Chunjie;
QI Shi;
ZHU Gaofeng;
HE Jiahua
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摘要:
The distribution of stable isotopes and ions in precipitation in the Shule River Basin,northwestern China,were investigated to understand the regional water cycle and precipitation input to groundwater recharge.The study found that the mean annual concentrations of Ca2+,Na+,SO42–,Cl–,Mg2+,NO3–,and K+ in the basin were lower than those in other arid areas of northwestern China.The average concentrations of ions in the lower reaches of the Shule River were higher than those in the upper reaches.The results showed that the main ionic concentrations decreased with the increase of precipitation amount,indicating that heavy precipitation cannot only wash crustal aerosols out of the atmosphere,but also create a dilution effect.Cl– and Na+ in precipitation had a strong and positive correlation,suggesting a common origin for the two ions.However,the excess of Na+,combined with non-marine SO42– and NO3–,indicated that some ions were contributed by terrestrial origins.In the extremely arid regions of northwestern China,the evaporation process obviously changes the original relationship between δ2H and δ18O in precipitation,and leads to dexcess values <8‰.δ18O and temperature were significantly correlated,suggested that temperature strongly affected the characteristics of isotopes in the study area.The δ18O value indicates a dominant effect of westerly air masses and southwest monsoon in warm months,and the integrated influence of westerly and Siberian-Mongolian polar air masses in cold months.The d-excess values were generally lower in warm months than those in cold months,indicating that post-condensation processes played a significant role in the water cycle.The results provide reliable precipitation input information that can be used in future groundwater recharge calculations in the study area.
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摘要:
Zhong Ke San Huan and Hitachi Metals intend to establish a Joint Venture As announced in the notice dated February 9,2015 and entitled'Zhong Ke San Huan and Hitachi Metals Sign Letter of Intent to Establish Joint Venture Aims to Produce Neodymium-Iron-Boron Magnets in China and Expand Business Scales',Beijing Zhong Ke San Huan Hi-Tech Co.,Ltd.(hereafter,'Zhong Ke San Huan')and Hitachi Metals,Ltd.(hereafter,'Hitachi Metals')have engaged in a series of discussions aimed at establishing a joint venture in the manufacture and sale of Neodymium-Iron-Boron magnets.
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李新社;
姚俊萍;
李悦
- 《2006年中国西部地区信息技术学术研讨会》
| 2006年
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摘要:
集合对称差又叫环和,其运算性质的证明方法应该和证明其它集合运算性质一样或类似,但环和运算性质的详细证明过程论述由于复杂而不多见.本文对环和运算性质给出了较为详细的论述和证明,特别是对环和运算可结合性的证明给出了两种不同的方法,既简单又清晰.同时又给出了其方法的两个典型应用.
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- 曾尼卡有限公司
- 公开公告日期:1999-12-08
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摘要:
式(Ⅰ)化合物:P-R
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