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1.
《中学化学教学参考》2000,(7)
Ｈ1008相对原子质量 Ｈｅ4003Ｌｉ6941Ｂｅ9012Ｂ1081Ｃ1201Ｎ1401Ｏ1600Ｆ1900Ｎｅ2018Ｎａ2299Ｍｇ2431Ａｌ2698Ｓｉ2809Ｐ3097Ｓ3207Ｃｌ3545Ａｒ3995Ｋ3910Ｃａ4008Ｒｂ8547Ｓｒ8762Ｃｓ1329Ｂａ1373Ｓｅ4496Ｔｉ4788Ｖ5094Ｃｒ5200Ｍｎ5494Ｆｅ5585Ｃｏ5893Ｎｉ5869Ｃｕ6355Ｚｎ6539Ｙ8891Ｚｒ9122Ｎｂ9291Ｍｏ9594Ｔｔ9891Ｒｕ1011Ｒｈ1029Ｐｄ1064Ａｇ1079Ｃｄ1124ＬａＬｕＨｆ1785Ｔａ1809Ｗ1839Ｒｅ1862Ｏｓ1902Ｉｒ1922Ｐｔ1951Ａｕ1970Ｈｇ2006Ｃａ6972Ｇｅ7261Ａｓ7492Ｓｅ7896Ｂｒ7990Ｋｒ8380Ｉｎ1148Ｓｎ1187Ｓｂ1218… 相似文献
2.
ＩＳＴＨＥＮＯＶＥＬＤＥＡＤ ?Ｔｈｅｒｅｈａｓｂｅｅｎｎｏｌａｃｋｏｆｐｒｏｐｈｅｃｉｅｓｏｆｔｈｅｄｅａｔｈｏｆｔｈｅｎｏｖｅｌｓｉｎｃｅｔｈｅｂｅｇｉｎｎｉｎｇｏｆｔｈｅ2 0ｔｈｃｅｎｔｕｒｙ .Ｍａｎｙｐｒｅｓｔｉｇｉｏｕｓｃｒｉｔｉｃｓ,ｓｕｃｈａｓＴ .Ｓ .Ｅｌｉｏｔ,ＯｒｔｅｇａＹ .Ｇａｓｓｅｔ,ＡｌｂｅｒｔｏＭｏｒａｖｉａａｎｄＣｙｒｉｌＣｏｎｎｏｌｌｙ ,ｈａｖｅｒｅｌｅｎｔｌｅｓｓｌｙｐｒｏｎｏｕｎｃｅｄｄｅａｔｈｓｅｎｔｅｎｃｅｏｎｔｈｅｎｏｖｅｌ.Ａｌｔｈｏｕｇｈｔｈｏｕｓａｎｄｓｏ… 相似文献
3.
Ｅｖｅｒｙｌｉｔｔｌｅｉｍｐｒｏｖｅｍｅｎｔｏｆｔｈｅｊｏｕｒｎａｌｄｅｐｅｎｄｓｏｎｔｈｅｓｔｒｏｎｇｓｕｐｐｏｒｔｆｒｏｍｔｈｅｒｅｖｉｅｗｅｒｓ .ＷｅｔａｋｅｔｈｉｓｏｐｐｏｒｔｕｎｉｔｙｔｏｇｉｖｅｏｕｒｈｅａｒｔｆｅｌｔｔｈａｎｋｓｔｏｒｅｖｉｅｗｅｒｓｉｎＣｈｉｎａａｎｄａｂｒｏａｄｆｏｒｔｈｅｉｒｈｅｌｐｓｉｎｃｅｔｈｅｅｓｔａｂｌｉｓｈｍｅｎｔｏｆｔｈｅｊｏｕｒｎａｌ.Ｄｒ.ＭａｒｔｉｎＰｉｒｃｈｅｒ Ｗ ＳｙｄｎｅｙＵｎｉｖ.ＡｕｓｔｒａｌｉａＤｒ.ＪｏｓｅｆＢａｉｌｅｒ Ａｕｓ.… 相似文献
4.
1 Ｉｎｔｒｏｄｕｃｔｉｏｎ 4Ｃｒ5ＭｏＳｉＶ1ｓｔｅｅｌ (ＡＩＳＩＨ13ｏｒ 84 0 7)ｉｓｏｎｅｏｆｔｈｅｍｏｓｔｐｏｐｕｌａｒｈｏｔｗｏｒｋｉｎｇｄｉｅｓｔｅｅｌｓ .Ａｓａｍａｊｏｒａｌｕ ｍｉｎｕｍｃａｓｔｉｎｇｄｉｅｍａｔｅｒｉａｌ,ｉｔｈａｓｔｏｅｎｄｕｒｅｔｈｅｒｍａｌａｎｄｍｅｃｈａｎｉｃａｌｉｍｐａｃｔｏｆｍｏｌｔｅｎａｌｕｍｉｎｕｍａｔｅｌｅｖａｔｅｄｔｅｍｐｅｒａｔｕｒｅ ,ｗｈｉｃｈｒｅｓｕｌｔｓｉｎｆａｉｌｕｒｅｓ ,ｓｕｃｈａｓ ,ｈｅａｔｃｈｅｃｋｉｎｇ ,ｃｏｒｒｏｓｉｏｎｏｒｓ… 相似文献
5.
孙剑波 《中学数学教学参考》2000,(8)
文 [1]得到Ｔｎ=ｃｏｓｎ2π7 ｃｏｓｎ 4π7 ｃｏｓｎ 6π7的一个递归式 :Ｔｎ 3 =- 12 Ｔｎ 2 12 Ｔｎ 1 18Ｔｎ.本文给出 {Ｔｎ}的一个通项公式Ｔｎ=- 12 72 ｎ ｋ∈ＫＣｋｎ [1 ( - 1) ｎ] 72 ｎ 2 Ｃ[ｎ2 ] ｎ ,( )其中Ｋ ={ｋ|ｎ - 2ｋ =7ｍ ,0≤ｋ≤ [ｎ - 12 相似文献
6.
计算ｃｏｓｎ2π7 ｃｏｓｎ4π7 ｃｏｓｎ6π7的一个通项公式逆用如下组合恒等式[1] : [ｎ2 ]ｋ =0 Ｃｋｎｃｏｓ(ｎ -2ｋ)ｘ=2 ｎ - 1ｃｏｓｎｘ(ｎ为奇数 ) ,2 ｎ - 1ｃｏｓｎｘ 12 Ｃｎ2ｎ(ｎ为偶数 ) ,即将ｘ =2π7,4π7,6π7代入 ,三式相加 ,当ｎ为奇数时 ,ｆ(ｎ) = ｉ=2 相似文献
7.
文 [1 ]证明了 :若ａ、ｂ、ｃ为△ＡＢＣ的三边 ,则ａ′=ｂ2 ｃ2 ,ｂ′ =ｃ2 ａ2 ,ｃ′ =ａ2 ｂ2 可构成△Ａ′Ｂ′Ｃ′ .采用通用记号 (如△、△′表面积 ,ｐ、ｐ′表半周长 ,ｒ、ｒ′表内切圆半径 ,等等 ) ,则由公式(△′) 2 =△2 ∑ 1ｓｉｎ2 Ａ.可推出 △Ａ′Ｂ′Ｃ′与△ＡＢＣ间的一系列关系 :1 △′≥ 2△ ( =|ａ =ｂ=ｃ) ;2 2 ｐ≤ｐ′<3ｐ ;3 ｒ′≥869ｒｃｏｓ Ａ2 ｃｏｓ Ｂ2 ｃｏｓ Ｃ2 ;4 Ｒ′≥ 82Ｒｓｉｎ Ａ2 ｓｉｎ Ｂ2 ｓｉｎ Ｃ2 ;5 ( ｈａ′ｈａ)2 ( ｈｂ′ｈｂ)2 ( ｈｃ′ｈｃ)2 ≥ 6.二次均值三角形的性… 相似文献
8.
王进军 《上海大学学报(英文版)》2000,4(1):11-13
1 Ｉｎｔｒｏｄｕｃｔｉｏｎ ＷｈｅｎｔｈｅＤｒｕｃｋｅｒＰｒａｇｅｒｙｉｅｌｄｃｒｉｔｅｒｉｏｎｉｓｕｓｅｄ,ｔｈｅＭＳＣ/ＮＡＳＴＲＡＮｐｒｏｇｒａｍ[1]ｏｆｔｅｎｐｒｅｄｉｃｔｓｎｏｔｉｃｅａｂｌｅｅｒｒｏｒｓ.Ｔｈｉｓｃａｎｂｅｏｂｓｅｒｖｅｄｕｓｉｎｇａｓｉｍｐｌｅｅｘａｍｐｌｅ.Ｗｈｅｎａｓｉｎｇｌｅｅｌｅｍｅｎｔｓｕｂｊｅｃｔｔｏｕｎｉａｘｉａｌｔｅｎｓｉｌｅｓｔｒｅｓｓｉｓｃｏｎｓｉｄｅｒｅｄ,ｔｈｅｐｒｅｄｉｃｔｅｄｓｔｒｅｓｓｓｔｒａｉｎｒｅｌａｔｉｏｎｄｅｖｉａｔｅｓｆｒｏｍｔｈ… 相似文献
9.
本文报导了Ｃｕ＝ｅｒ－Ｍｏ／ｓｉｏ２三元复合催化剂中Ｃｕ，Ｃｒ，Ｍｏ的测定方法，此法简便，快速，获得令人满意结果。 相似文献
10.
汪仁友 《中学数学教学参考》2000,(7)
本刊 1 999年第 1 1期刊出邵、高两位老师对ｓｉｎｎｘｓｉｎｘ下界的改进 ,本文给出定理 设ｎ∈Ｎ ,ｎ >1 ,0 <ｎｘ <π2 ,则ｓｉｎｎｘｓｉｎｘ >1ｓｉｎ π2ｎ.证明 :由已知得 0 <ｘ <π2ｎ.下面证明 ｆ(ｘ) =ｓｉｎｎｘｓｉｎｘ 在区间 (0 ,π2ｎ)上为减函数 ,事实上 ,有ｆ′(ｘ) =ｎｃｏｓｎｘｓｉｎｘ -ｓｉｎｎｘｃｏｓｘｓｉｎ2 ｘ =ｕ(ｘ)ｓｉｎ2 ｘ,则 ｕ′(ｘ) =(-ｎ2 ｓｉｎｎｘｓｉｎｘ ｎｃｏｓｎｘｃｏｓｘ) -(ｎｃｏｓｎｘｃｏｓｘ -ｓｉｎｎｘｓｉｎｘ)=-(1 -ｎ2 )ｓｉｎｎｘｓｉｎｘ <0 .∴ｕ(ｘ)在 (0 ,π2ｎ)上… 相似文献
11.
1 Ｉｎｔｒｏｄｕｃｔｉｏｎ Ｔｈｅｆｕｎｄａｍｅｎｔａｌｐｈｙｓｉｃａｌｍｅｔａｌｌｕｒｇｙｏｆｔｈｅｒｍｏｍｅｃｈａｎｉｃａｌｐｒｏｃｅｓｓｉｎｇ(ＴＭＰ)ｈａｓｂｅｃｏｍｅｍｕｃｈｂｅｔｔｅｒｕｎｄｅｒｓｔｏｏｄｏｖｅｒｔｈｅｌａｓｔｔｗｏｄｅｃａｄｅｓ[1～8].ＩｔｉｓｗｅｌｌｃｏｍｍｏｎｌｙｒｅｃｏｇｎｉｚｅｄｔｈａｔｔｈｅｍｉｎｕｔｅａｄｄｉｔｉｏｎｏｆｓｔｒｏｎｇｃａｒｂｏｎｉｔｒｉｄｅｏｒｎｉｔｒｉｄｅｆｏｒｍｉｎｇｅｌｅｍｅｎｔｓｓｕｃｈａｓＮｂ,ＴｉａｎｄＶｔａｋｅｓｖｅｒｙｉｍｐ… 相似文献
12.
ZAKHARENKO A. A. 《浙江大学学报(A卷英文版)》2007,8(7):1065-1076
In this paper, the obtained experimental results concerning creation of bulk elementary excitations (BEEs) in iso-topically pure liquid 4He at low temperatures ~60 mK are discussed. Positive rotons’ (R -rotons) creation by a pulsed heater was studied. Signals were recorded for the following quantum processes: quantum evaporation of 4He-atoms from the free liq- uid-helium surface by the BEEs of the liquid helium-II, and BEEs reflection from the free surface back into the bulk liquid. Typical signals are shown, and ratios of signal amplitudes are evaluated. For long heater pulses from 5 to 10 μs, appearance of the second atomic cloud consisting of evaporated 4He-atoms was observed in addition to the first atomic cloud. It is thought that the first atomic cloud of the evaporated helium atoms consists of very fast 4He-atoms with energies ~35 K evaporated by positive rotons with the special energies ~17 K (~2ER~2×8.6 K with ER representing the roton minimum energy) corresponding to the third non-dispersive Zakharenko wave. The second cloud of slower 4He-atoms was created by surface elementary excitations (SEEs or ripplons) possessing the special energies ~7.15 K representing the binding energy. It was assumed that such SEEs can be created by phonons incoming to the liquid surface with special energies ~6.2 K corresponding to the first non-dispersive Zakharenko wave, which can interact at the liquid surface with the same phonons already reflected from the surface for long heater pulses. Also, some pulsed-heater characteristics were studied in order to better understand the features of such heaters in low temperature experi- ments. 相似文献
13.
Pakistani wheat varieties are grown over a wide agro-climatic range and as such are anticipated to exhibit yield and quality differences. It is therefore necessary to investigate the nutritional status of wheat varieties in terms of biochemical and physiochemical characteristics available for food and nutritional purposes in Pakistan. The result shows that wheat grains of different varieties contain a net protein level of 9.15%～10.27%, 2.15%～2.55% total fats, 1.72%～1.85% dietary fibers,77.65×10^-6～84.25×10^-6 of potassium and 7.70× 10 6～35.90× 10^-6 of sodium ions concentration, 0.24× 10^-6～0.84× 10^-6 of phosphorus, 1.44%～2.10% ash, 31.108～43.602 g of thousand grain mass （TGM） and 8.38%～9.67% moisture contents. This study is significant in providing an opportunity to explore the available wheat varieties and to further improve their nutritional excellence and also essential for setting nutritional regulations for domestic and export purposes. 相似文献
14.
INTRODUCTION Nitrogen oxide (NOx) is one of the main air pol- lutants found in the flue gases from chemical and power plants belching acid rain and photochemical smog. Over 90 percent of all man-made nitrogen ox- ides that enter our atmosphere are produced by the combustion of various fuels. Compared with the ad- vanced stage of SO2 gas removal technologies devel- opment, the removal of NOx gases is still in the initial stages of development as roughly 90 to 95 percent of NOx emitted i… 相似文献
15.
Isolation and characteristics of Arthrobacter sp. strain CW-1 for biodegradation of PAEs 总被引：1，自引：0，他引：1
WU Dong-lei ZHENG Ping MAHMOOD Qaisar YANG Xiao-sheng 《浙江大学学报(A卷英文版)》2007,8(9):1469-1474
Isolation of new bacterial strains and recognition of their metabolic activities are highly desirable for sustainability of natural ecosystems. Biodegradation of dimethyl phthalate (DMP) under anoxic conditions has been shown to occur as a series of sequential steps using strain CW-1 isolated from digested sludge of Sibao Wastewater Treatment Plant in Hangzhou,China. The microbial colony on LB medium was yellowish,3～5 mm in diameter,convex in the center,and embedded in mucous externally. The individual cells of strain CW-1 are irregular rods,measuring (0.6～0.7)×(0.9～1.0) μm,V-shaped,with clubbed ends,Gram positive and without any filaments. 16S rDNA (1438 bp) sequence analysis showed that the strain was related to Arthrobacter sp. CW-1 and can degrade PAEs utilizing nitrate as electron acceptor,but cannot mineralize DMP completely. The degradation pathway was recommended as: dimethyl phthalate (DMP)→monomethyl phthalate (MMP)→phthalic acid (PA). DMP biodeg-radation was a first order reaction with degradation rate constant of 0.3033 d-1 and half-life 2.25 d. The DMP conversion to PA by CW-1 could be described by using sequential kinetic model. 相似文献
16.
为了揭示HPS485wf钢动态再结晶组织演变行为,在不同的单道次热压缩变形条件下,进行了该钢动态再结晶过程的CA仿真．结果表明：随着变形温度升高,动态再结晶的孕育期缩短、速度加快,平均晶粒尺寸增加;随着应变速率加快,动态再结晶的孕育期延长、速度减慢,平均晶粒尺寸减小． 相似文献
17.
In this study aimed to evaluate the pollution extent of metals and nonmetals inside and outside the ferrosilicon production factory in Edfu, Aswan, Egypt, raw materials (quartz, cokes, iron oxides), ferrosilicon alloy, silica fume, dust and suspended dust (at different sites) samples were collected from the factory, and fallen dust samples were collected from outside the factory, horizontally (at different sites and different distance and directions) and vertically (at different floors in the selected buildings). Gravimetric methods, X-ray fluorescence (XRF), flame photometer, wide range carbon determinator and atomic absorption spectroscopy tools were used for elements determination. The results indicating that the fallen dust and its element contents on southern factory walls being higher than those on eastern factory walls may be due to the nature of the dusts and effects of wind force and wind direction. Fallen dust levels in different regions outside the factory were found to be affected by the distance, direction and floors. The nature of dust samples was affected by gravity and the suspended dust in different factory units depended on the work capacity and method of handling materials by personnel in different production units. Silica fume was a complicated problem, had dangerous effect against the workers' health, and was characterized by high concentrations of SiO2(90.6%～93.6%) and heavy metals (Mn, 420.6×10-6～520.3×10-6; Fe, 2354×10-6～2685×10-6; Co, 80.7×10-6～101.6×10 6 and Ni,5.3× 10-6～6.05× 10-6). The TSP (Total Suspended Particulate) levels in all factory units were higher than the recommended air quality value (70 μg/m3) under Egyptian law. The effect of ferrosilicon factory fallen dust on the surrounding regions decreased with increasing distance between the factory and these regions. The suspended dust samples in the factory units and their components greatly exceeded national and international standards, so health and environmental criteria must be enforced on these units. 相似文献
18.
研究了Al-1Mn-1Mg合金不同变形下的流变应力曲线和微观结构特征,探讨了该铝材在热变形过程中的动态软化行为.结果表明,应变速率为0.1 s-1时,若变形温度较低,则发生了动态回复;若变形温度高于723 K,产生明显的动态再结晶;变形温度为673 K时,在低应变速率条件下,产生动态再结晶,应变速率高于0.1s-1,软化过程具有动态回复和动态再结晶的混合特征.当应变速率高于5.0s-1时,产生几何动态再结晶. 相似文献
19.
何燕 《鞍山师范学院学报》2009,11(6):23-25
采用元胞自动机方法对多晶金属热变形中的动态再结晶过程建立了二维模型．模型模拟了热加工变形中动态再结晶过程．通过模拟可以得到热变形金属的微观组织形貌和变形后晶粒的大小与分布,再现了再结晶组织的微观特征．结果与实验观察到的热变形组织形貌基本符合,并分析了热加工参数对再结晶组织形貌的影响． 相似文献