氮化的

In my opinion, Cu complexes with unsaturated alcohol to form a complex compound; the nitrogenous compound introduced serves as the complex compound's stabilizing agent and reduces activation energy of reaction; TMPO serves as oxygen carrier and displays it's selective oxidation function. This new method and mechanism also demonstrates significance to other similar organic reactions.3 In the chlorohydrin reaction, NaCIO is replaced by Ca2see Chapter4.4.3.4(2 .A, this method hasn't been reported in previous literature,which exerts more buffer action to the react system, the yield increased from 52% to 88.6%; at the same time it solve the problem of poor stability and low percentage composition of NaCIO.

认为：CuD与烯醇形成络合物：含氮有机物的引入起到稳定络合物，降低活化能的作用：而TMPO则充当携氧子起传递氧的作用，并具有选择氧化功能：这种新的方法和理论对类似的反应(不饱和醇类在络合体系下选择性催化氧化为对应的醛也具有重要的指导作用。3在异戊二烯的氯醇化反应中，用次氯酸钙代替次氯酸钠见第4章4.3.4(2.A，本方法未见文献报道，使反应系统更加温和，收率由52%提高到88.6%：并解决了次氯酸钠稳定性差、有效氯含量低的实际问题，具有重要的实用意义。

The invention provides the flux-cored wire for welding the duplex stainless steel, 17 percent to 24 percent flux-cored powder is filled into stainless steel belt. The invention is characterized in that the mass percent of the components of the flux-cored is as follows: 35 percent to 40 percent of chromium powder, 11 percent to 15 percent of molybdenum powder, 2 percent to 4 percent of nickel powder, 3 percent to 5 percent of manganese powder, 1 percent to 5 percent of magnesia chrome, 1 percent to 3 percent of ferrosilicon, 4 percent to 9 percent of rock crystal, 2 percent to 6 percent of feldspar, 21 percent to 30 percent of rutile, 0.5 percent to 4 percent of Al2O3, 0 percent to 5 percent of zircon, 0.5 percent to 3 percent of Bi2O3, and 0.5 percent to 3 percent of manganese nitride.

一种用于焊接双相不锈钢的药芯焊丝，将药芯粉末以17～24％填充在不锈钢带内，其特征在于，所述的药芯质量百分比成分如下：35～40％的金属铬粉，11～15％的金属钼粉，2～4％的金属镍粉，3～5％的金属锰粉，1～5％的铝镁合金，1～3％的硅铁，4～9％的石英，2～6％的长石，21～30％的金红石，0.5～4％的Al 2 O 3 ，0～5％的锆英石，0.5～3％的Bi 2 O 3 ，0.5～3％的氮化锰。

The significant relationship was also found between the difference of easily mineralizable nitrogen before and after planting with soil net nitrogen mineralizable and plant nitrogen uptake.

结果表明，种植前土壤易矿化有机态氮和土壤微生物态氮以及种植前后土壤易矿化有机态氮的变化量均与土壤氮素净矿化量和植物吸氮量之间存在显著的相关性。

Cumulative NH4+-N is a good evaluating index of soil N-supplying not only for the first season crop, but also for two successive season crops. ND is more correct in revealing the potential mineralizable nitrogen when SON was regarded as mineralized N, although cumulative SON alone is not a good index for the potential of mineralizable nitrogen. And cumulative TSN could also be taken as an index for the potential mineralizable nitrogen to some extent.

淹水培养期间铵态氮累积量是评价可矿化氮的较好指标，不仅适宜于第一季作物，而且也适用于连续两季作物；SON累积量不能单独作为；SON累积量不能单独作为反映可矿化氮的指标，但用ND反映土壤可矿化氮潜势时，包括SON后更加准确；TSN在一定程度上能够反映土壤可矿化氮。

A one-step method for the synthesis of aromatic indolizine derivatives byintramolecular 1,5-dipolar cyclization reaction of 2-(2-arylethenyl)pyridinium N-ylidesin the presence of an oxidant has been studied for the first time. In the presence ofelectron-deficient olefins, however, 2-(2-phenylethenyl)pyridinium N-ylides underwent1,3-dipolar cycloadditions and then aromatized in situ by TPCD to produce indolizinederivatives, indicating 1,3-dipolar cycloaddition proceed more readily than 1 ,5-dipolarcyclization in these conditions. Pyridinium disubstituted N-ylides, readily obtainedfrom corresponding pridinium and β-chlorovinyl ketone, underwent thermalintramolecular 1,5-dipolar cyclization to give indolizine derivatives easily.Indolizinecarbaldehyde derivatives were synthesized starting from 2-pyridinecarbaldehyde in four-steps involving 1,3-dipolar cycloaddition reaction.

本文首次研究了2-(2-芳基乙烯基)吡啶N-叶立德在氧化剂存在下的分子内1，5-偶极环化反应，采用一锅法合成了中氮茚衍生物；研究了这些N-叶立德的1，5-偶极环化和1，3-偶极环加成反应的选择性，发现当有缺电子烯烃存在时，优先进行1，3-偶极环加成反应，而不再发生分子内1，5-偶极环化反应；由β-氯乙烯酮方便地得到了烯丙基N-叶立德，他们在加热时进行分子内1，5-偶极环化反应而得到中氮茚衍生物；由2-吡啶甲醛为起始原料，通过1，3-偶极环加成反应等四步反应，得到了重要的中氮茚甲醛衍生物，这些反应都具有条件温和和操作简便的特点，是合成中氮茚衍生物的新方法。

The copper-catalyzed 1,3-dipolar cycloaddition of alkynes with azides is a typical example of "click" reaction.1 Since the reaction enjoys the advantages of high efficiency and regioselectivity and requires mild reaction conditions and simple purification procedures, it has become a versatile synthetic tool with applicability in diverse areas including bioconjugation and surface modification.2 The click reaction has also been utilized in polymer science with emphasis on the functionalization of preformed polymers through postpolymerization approaches.3 The effort of developing the reaction into a new polymerization technique, however, has met with only limited success.

登录后回答可以获得经验值奖励，并可以查看和管理所有的回答。登录|铜催化1，3偶极环加成反应的炔烃与叠氮化物是&点击&自reaction.1典型的例子反应享有高效率的优势和区域选择性并要求反应条件温和，简单净化程序，它已成为一个多功能综合工具在包括生物耦合和不同领域的适用性表面modification.2的点击反应亦是利用聚合物科学与功能化的重点通过postpolymerization approaches.3预制聚合物发展到一个新的聚合反应的努力技术，然而，只取得有限的成功。

The results showed that a combined application of manure and chemical NPK and long-term fallowing increased the contents of soil organic matter, total N, and mineralized N, as well as the N mineralization rate significantly, compared with the control.

结果表明：氮磷钾化肥和有机肥配施及长期撂荒处理显著提高了土壤有机质和全氮含量以及土壤氮素矿化量和矿化率；氮磷钾化肥处理虽然提高了土壤无机氮含量，但对土壤有机质、全氮、土壤氮素矿化量和矿化率的影响相对较小。

The mainly conclusions in our research are as flowing: tungsten trioxide powders with 100 nm primary particle are obtained by spray drying,calcination and wet milling process, and an average size of quadric particle composed of agglomerated particles is 0.64 μm; tungtsen powders with 39 nm grain size and 60 -100 nm primary particle are produced directly from previous tungsten trioxide using one step reduction in hydrogen at 700℃, and an average size of quadric particle of tungsten powder is 2.91 μm; tungsten trioxide and copper tungstate compound powders with 100 nm - 200 nm primary particle are produced using ammonia metatungsten and copper nitrate as raw materials by spray drying,calcination and wet milling process;the compound powders are transformed completely into tungsten and copper compound powders by reduction in hydrogen at 700℃,in which tungsten grain size is 59 nm and copper grain size is 51 nm; primary particle size of compound powders is 80 - 120 nm,and an average size of agglomerated quadric particle is 1.86 μm; tungsten nitride powders with 35 nm grain size are prepared from tungsten trioxide powders by nitrogen treatment thoroughly in pure ammonia at 650℃, and an average size of agglomerated quadric particle is 0.64 μm in normal temperature.

研究结果表明：采用喷雾干燥—焙烧—球磨工艺可以制备出粒度约为100nm的WO_3粉体，它们在团聚后形成的二次颗粒平均粒度为0.64μm；采用一步直接氢还原方法可在700℃下从上述WO_3粉体制备出晶粒尺寸为39nm的、一次颗粒粒度为60-100nm的W粉体，其二次颗粒的平均粒度为2.91μm；以偏钨酸铵、硝酸铜为原料，采用喷雾干燥—焙烧—球磨工艺可制备出一次粒度为100-200nm的WO_3和CuWO_4混合粉体；采用氢还原工艺可在700℃下将这种粉体完全转变为W、Cu复合粉体，其中W的平均晶粒粒尺寸为59nm，Cu的平均晶粒尺寸为51nm；复合粉体的一次颗粒尺寸为80-120nm，在常温下团聚后形成的二次平均粒度为1.86μm；采用纯氨氮化工艺可以在650℃下由WO_3粉体制得WN，其晶粒尺度为35nm，在常温下团聚后的二次平均粒度为6.4μm。

CERATIP KYOCERA, is cutting tools is Japan KYOCERA KYOCERA company in the world's most advanced precision ceramic technology as the core of the new generation of turning, milling and CNC machining centers on the use of cutting tools manufacturers, the company specialized in diligently unremitting spirit of innovation, and advanced technology, the application of the material in the different needs of customers, with more and more durable of the target, developed a new generation of pottery and porcelain, metal ceramics, the metal ceramic coatings, carbide and carbide coating, diamond and CBN, and other types of tools, the main products are inside and outside the turning tools, small parts processing cutting tool, cutting tool, cutting tool, drilling, thread milling cutter, plane, end milling machining tool with etc.

京瓷CERATIP尚乐特刀具是日本KYOCERA公司以世界最领先的精密陶瓷技术为核心的新一代车削、铣削及数控加工中心上使用的可转位刀具的专业刀具生产厂商，公司以努力不懈的创新精神，加上最先进的材料技术的应用，针对客户的不同需要，本着的目标，开发了新一代的陶瓷、金属陶瓷、金属陶瓷涂层、硬质合金及硬质合金涂层、金刚石及立方氮化硼等各种类型的刀具，主要产品有内、外园车削刀具、小零件加工刀具、切槽、切断刀具、车螺纹刀具、钻孔刀具、平面铣削加工刀具、端铣刀具等等。

Based on the practice of the use of φ95mm subsurface sucker rod pump in Shengtuo Oilfield in recent years, the causes of the failure of the pump are analyzed, and relevant precautions are put forward:(1)selecting oil wells with sufficient fluid supply for pumping;(2)under the condition of the pump efficiency being the same, the submergence depth of the pump being somewhat larger than that of the small pump, and 450～500m being feasible;(3)adopting Grade H ultrahigh-strength rod string and fixing a sinker bar at the bottom of the rod string;(4)selecting long stroke and low pumping speed, and more than 5m stroke and less than 6min-1 pumping speed being recommended;(5)adopting zirconium oxide valve ball and seat ＋ spray welded plunger ＋ nitrided barrel.

根据胜坨油田近几年采用φ95mm有杆抽油泵提液的实践，分析了造成这种抽油泵失效的原因，包括与其配套的脱节器失效、抽油杆断脱、泵漏、电动机不配套和生产管理不善等。为增强泵的提液能力和工作可靠性，提出5 项预防措施：(1)选择有充足供液能力的油井；(2)在保持相同泵效的情况下，泵的沉没度应略大于小泵，推荐按450～500m设计；(3)采用H级超高强度抽油杆柱，并在杆柱底部配置一定重量的加重杆；(4)采用长冲程、低冲次的参数匹配，推荐光杆冲程大于5m，冲次小于6min-1；(5)为提高泵筒、活塞和阀座的防腐耐磨性，推荐采用&氧化锆阀球和阀座+喷焊柱塞+氮化泵筒&的结构形式。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。