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Based on the quasi-dimension combustion model, the emission model is set up in this dissertation. The NO emissions in different conditions of LPG engine can be simulated and calculated by the model. The calculated results show that the NO emissions are larger influenced by ignition timing and less influenced by compression ratio, finally, choosing a right coefficient of excess air will have great effect to reduce NO emissions.
本文在建立的准维燃烧模型基础上建立了排放生成模型,利用该模型对液化石油气发动机在变参数情况下NO的排放生成情况进行了模拟计算,计算结果表明点火提前角对NO的生成影响较大,压缩比对NO的生成影响较小,而选择合适的过量空气系数更是对降低NO的生成起着关键作用。
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Orthogonal experiment under special condition showed that modifier M has marked effect on properties of no bake sand. Other factors such as modifier B,phosphate concentration and aluminum hydroxide have some impact on properties of binder. It can be found by experiments that strengths of no bake sand are raised notably by binder that modified by modifier B. Modifier B can reduce the strength of no bake sand at high room temperature apart from condition of low room temperature that it can accelerate the reaction and strengthen the sand. Modest content of modifier M in binder has some improvement to anti-wettability of sand. But modifier B has not such notable effect. Electronic microscope shows that near cracks in no bake product there are fibrous shape substances formed when the samples are moistured in high humidity air for sometime.
通过改性剂B对粘结剂自硬砂的性能影响试验发现,改性剂B能显著提高粘结剂自硬砂的强度,在0℃左右很低的环境温度下改性剂M有利于提高自硬砂的反应速度和砂型强度外,但在较高环境温度下,改性剂M均降低粘结剂自硬砂的强度,但是适量的改性剂M有利于改善自硬砂的抗吸湿性,而改性剂B对于改善自硬砂的抗吸湿性的作用不如改性剂M明显,电镜观察发现抗吸湿性较好的自硬砂在高湿度下存放一定时间后,在粘结膜裂纹处会形成一种绒毛状物质,该物质对裂纹具有愈合作用,这种绒毛状物质中具有改性剂M中的某种成分,且含量很高,由此说明改性剂M对提高抗吸湿性有利。
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Three kinds of BCRC No.51534, 10322 and 10675 would be selected and acted as an experimental sample of Escherichia coli. Results shows that Escherichia coli of No.51534 will appear better performance because the maximum of open circuit voltage, closed current and power density are 1.01V, 22mA and 1342mW/m2, respectively. Concerning the effect of culture time with respect to different phase type on the electricity performance of MFCs, the time points on the intersection between lag phase and logarithmic phase, the middle of point of stationary phase for growth curve of Escherichia coli would appear a good performance of MFCs. In addition, the BCRC No. 51534 Escherichia coli possessing a better performance of MFCs than others would be suggested and applied to further studying. Comparison with the performance of MFCs with respect to electron mediator under different mole number, result shows that electron mediator of methylene blue with 4.63mM would appear a better electricity performance of MFCs than others. Concerning the different material of proton exchange membrane with PTFE-Nafion, Nafion 211, 212 and 117 with respect to the performance of MFCs, result shows that the Nafion 117 applied in MFCs will have a better performance of MFCs than other cases. Finally, the effect of molar concentration on the performance of MFCs would be expected at the studied cases of 0.4M, 0.2M, 0.1M and 0.05M respectively for cathode oxidant, result shows that a good performance of MFCs will happen at the condition of 0.2M. Those observations will be useful to improvement of MFCs in the further study.
於上述电池系统条件下,进行大肠杆菌生长曲线、电子传递介质、质子交换膜、电极与阴极氧化剂对电池电性效能分析;选择编号10322、10675与51534之大肠杆菌为实验菌株,依定量培养之生长曲线取出代表不同时生长特性时期的培养时间,利用亚甲基蓝作为电子传递介质进行实验分析从所测得的电量进行分析,以编号51534之大肠杆菌的微生物燃料电池有最大的开路电压为1.01V及最大闭路电流为22mA;当极化曲线中电压为0.47V、电流为11.4 mA时有最大的功率密度为1342 mW/m2;加以负载有平均工作功率密度294 mW/m2;从生长曲线与电性效能来分析,得知生长曲线的迟滞期与对数期的转变点与静止期的中间点有最佳电性效能表现;对於加入不同莫耳数之电子传递介质methylene blue、neutral red与thionine之电池效能表现,则以加入4.63mM methylene blue电子传递介质的电池有较佳平均功率密度230 mW/m2;另对於质子交换膜PTFE-Nafion、Nafion 211、Nafion 212与Nafion 117之电池效能表现,以Nafion 117质子交换膜的电池有较佳平均功率密度340 mW/m2;对於分析加入不同莫耳数浓度0.4M、0.2M、0.1M与0.05M的阴极氧化剂之电池效能,则以0.2M的阴极氧化剂的电池可得到较佳平均功率密度429 mW/m2。
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When the gas flux is constant, the ratio of reduced resistance is improved with the increase of the water stream velocity. However, the relationship between the gas flux and the ratio of reduced resistance is more complex. When the water stream velocity is constant, if the gas flux is small in contrast, the effectiveness of reduced resistance is not obvious. But when the gas flux increased, the jetted gas will form """"archform"""" which will augment the shape resistance. In this condition, resistance could not be reduced and could even be increased, if the gas flux continues to be increased. So that there needs setting a baffle called step, which introduces the jetted gas into the turbulence boundary layer. In this case, the shape resistance may be fairly great. Besides, the waterline of model has also some effect on the ratio of reduced resistance, which acts on the size of wave. If waterline is deep, the wave could not affect the deployment of microbubble layer, so there is almost no effect on ratio of reduced resistance. However, the wave would affect distributing of microbubble layer under the model so that the gas could leak out from the two sides of model and directly affect the ratio of reduce resistance if the waterline is very small. Whether installing the dashplate or not has also the great influence on the effectiveness the ratio of reduced resistance. From the results of experiment, conclusion is that adding dashplate will greatly improve the effectiveness of reduced resistance.
当喷气量一定时,水流速度增大,减阻率提高;喷气量与减阻率之间的关系比较复杂,速度一定时,如果喷气量较小,减阻效果就比较差,但当喷气量增大的话,喷射出的气体就会形成一个&拱度&,增加了船模的形状阻力,在这种情况下最好采取断阶喷气,把气体引入到湍流边界层中,在这种情况下,船模的形状阻力比较大;船模的吃水对减阻率也有一定的影响,主要表现在波浪大小上,如果吃水较深,波浪影响不到微气泡层的分布,对减阻率不会造成太大影响,如果吃水较浅,波浪就会影响到微气泡层在船模底部的覆盖情况,可能会有部分微气泡从船模两侧泄漏,这样就直接影响到了减阻效果;是否安装压浪板,对减阻率也有较大的影响,从试验结果可以看出,在船模尾部加设了压浪板时,减阻效果明显得到改善。
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The effects of many factors in the wet end on drainage and retention of PEO/attapulgite system: During the scope of 2-12, pH has no effect on drainage, and retention ratio lower in acidic conditions and higher in neutral or alkaline conditions. There were some improvement on slurry's drainage and some impairment on retention efficiency for the existence of inorganic salts. Lignosulphonate had no effect on drainage and made retention ratio decrease 5-8%; lignosulphonate and xylan had no effect on drainage and made retention ratio decrease a little. 5 .Attapulgite could be modified by intercalation.
纸机湿部系统的影响因素对PEO/凹凸棒粘土助留体系的助留助滤效果的影响表现为:pH值在2-12范围内,对助滤效果是没有影响的,使助留效果在酸性条件下较差,而在中碱性条件下较好;无机盐的存在使浆料的滤水性能有一定的改善,使助留效果有所削弱;木质素磺酸盐对助滤效果是没有影响的,使留着率下降了5—8%;木质素磺酸盐与聚木糖对助滤效果也是没有影响的,使留着率略有下降。
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For Christ sent me not to baptize, but to preach the gospel: not with wisdom of words, lest the cross of Christ should be made of no effect.
017 基督差遣我,原不是为施洗,乃是为传福音,并不用智慧的言语,免得基督的十字架落了空。
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If any provision hereof violates any law of any jurisdiction,such provision shall be of no force and effect in such jurisdiction but shall not affect the validity of any provision hereof.
如果任何供应于此违犯任何司法任何法律,这样供应将是没有在这样司法的力量和作用,但是于此不会影响任何供应有效性。
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Any clause, covenant, or agreement in a contract of carriage relieving the carrier or the ship from liability for loss or damage to, or in connexion with, goods arising from negligence, fault, or failure in the duties and obligations provided in this Article or lessening such liability otherwise than as provided in this Convention, shall be null and void and of no effect.
运输合同中的任何条款、约定或协议,凡是解除承运人或船舶对由于疏忽、过失或未履行本条规定的责任和义务,因而引起货物或关于货物的灭失或损害的责任的,或以下同于本公约的规定减轻这种责任的,则一律无效。
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Several investigators have determined that placing the electrode parallel rather than perpendicular to the target nerve substantially increases the size of the lesion, thereby reducing the likelihood the treatment will miss or only partially coagulate the target nerve.234,235 After a literature review and cadaveric study, Lau et al.234 concluded the ideal electrode position is across the lateral neck of the superior articular process rather than the groove formed at the angle of the superior articular and transverse processes, as was used in most studies.159,160Other investigators have found the maximal lesion size to be reached within 60 s of lesion time,235–237 independent of whether the system is temperature or voltage controlled.238 Studies conducted in human myocardium have determined that irrigation fluid has either no effect or a slightly beneficial effect on lesion size.239 Hence, the use of LA to prevent procedure-related pain or steroid to reduce the incidence of neuritis184 should theoretically have no adverse effects on the efficacy of radiofrequency denervation.
一些研究者认为,将点击平行的置于目标神经比将其垂直置于目标神经增加了消融的范围,因而减少损伤可能使目标神经不被或部分被消融。Lau等回顾了文献中对尸体的研究,总结出理想的电极放置位置为上关节突颈部外侧而非常采用的上关节突与横突形成的沟。其他学者研究发现,不论系统是温度控制或电压控制,其最大的损伤范围都在60秒内达到。在心肌灌注的研究中,灌注液多损伤范围造成轻微或不造成损伤。因此,使用LA预防过程相关性疼痛或类固醇防止神经炎发生时,需理论上确保对射频消融效果无副作用。
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The effect of transgenx Bt cotton on non-target insects The kinds of the dominant species of pests in transgenic cotton field had obvious change, in which the H. armigera was no longer the main pest and the piercing-sucking pests such as Aphis gossypii, Tetranychus urticae, Thrips tabaci etc. rose the main pests. The kinds of the dominant species of predatory natural enemies seemed to be no variation, which was still Propylaea japonica Thunberg. Because of the effect of transgenic Bt cotton on H. armigera laevae-the development delay, the weight reduction, which affected the qualities of parasitic enemies, leading to the reduction of the weight of cocoon and the weight of adult, and the reduction of H.
转Bt基因棉对节肢动物群落整体结构及时序变化的影响 2001保铃棉与冀抗668的相似系数最高(0.8246),冀抗668、保铃棉与常规防治的相似系数依次0.6459、0.5829,保铃棉和冀抗668与常规不防治的相似系数为0.5669、0.4485.2002 年与冀杭668的相似系数最高(0 。6887),保铃棉和冀抗668与常规防治相似系数为0.4739、 0.3828,保铃棉和冀抗668与常规不防治的相似系数为0.3124、0.3999,此结果表明,两转Bt 基因棉田节肢动物群落的整体结构一致,相似性较大,与常规防治相比,相似系数有所降低,表明常规功治棉田中人为控制因素对节肢动物有一定影响;转Bt基因棉对节肢动物群落有一定影响,但并不显著。
- 推荐网络例句
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Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.
最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势,并设计了一款彩色夜视摄像机。
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Only person height weeds and the fierce looks stone idles were there.
只有半人深的荒草和龇牙咧嘴的神像。
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This dramatic range, steeper than the Himalayas, is the upturned rim of the eastern edge of Tibet, a plateau that has risen to 5 km in response to the slow but un stoppable collision of India with Asia that began about 55 million years ago and which continues unabated today.
这一引人注目的地域范围,比喜马拉雅山更加陡峭,是处于西藏东部边缘的朝上翻的边框地带。响应启始于约5500万年前的、缓慢的但却不可阻挡的印度与亚洲地壳板块碰撞,高原已上升至五千米,这种碰撞持续至今,毫无衰退。