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Vee-tail conceptual design criteria for commercial transport aeroplanes
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作者 Alejandro SANCHEZ-CARMONA Cristina CUERNO-REJADO 《中国航空学报:英文版》 SCIE EI CAS CSCD 2019年第3期595-610,共16页
Vee-tail configuration is an unconventional tail configuration for commercial transport aviation, the use of which could suppose reductions on CO2 emissions. The conceptual design criteria have been selected inspired ... Vee-tail configuration is an unconventional tail configuration for commercial transport aviation, the use of which could suppose reductions on CO2 emissions. The conceptual design criteria have been selected inspired on the certification requirements established by the aviation regulation in force. They are static stability in cruise, control after Critical Engine Failure(CEF),control in crosswind landing, and trim in these three conditions. The study is carried out through a combination of semi-empirical techniques and Vortex-Lattice Methods(VLM) and thus this analyses the consequences of applying these criteria to a reference aeroplane substituting its conventional tail by a parametrised Vee-tail configuration. The Vee-tail is defined by four parameters:span, root chord, taper ratio and dihedral angle. The results of the study establish a relation between the parameters in order to accomplish the proposed conceptual design criteria. To sum up, minimum and maximum limits are obtained for dihedral angle depending on the combination of the rest of parameters. In addition, a design restriction to the yawing trailing-edge tail control is reached when the results are analysed, demonstrating that its minimum size must be between 60%and 80% of the half-span of the tail, depending on the Vee-tail geometry. 展开更多
关键词 COMMERCIAL TRANSPORT aeroplane CONCEPTUAL aircraft DESIGN TAIL DESIGN requirements Unconventional TAIL DESIGN Vee-tail
Econometric modeling of risk measures: A selective review of the recent literature 预览
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作者 TIAN Ding-shi CAI Zong-wu FANG Ying 《高校应用数学学报:英文版(B辑)》 SCIE CSCD 2019年第2期205-228,共24页
Since the financial crisis in 2008, the risk measures which are the core of risk management, have received increasing attention among economists and practitioners. In this review, the concentration is on recent develo... Since the financial crisis in 2008, the risk measures which are the core of risk management, have received increasing attention among economists and practitioners. In this review, the concentration is on recent developments in the estimation of the most popular risk measures, namely, value at risk (VaR), expected shortfall (ES), and expectile. After introducing the concept of risk measures, the focus is on discussion and comparison of their econometric modeling. Then, parametric and nonparametric estimations of tail dependence are investigated. Finally, we conclude with insights into future research directions. 展开更多
关键词 Expectile EXPECTED Shortfall Network RISK NONPARAMETRIC Estimation TAIL DEPENDENCE Value at RISK
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Identification of a Novel Universal Potential Epitope on the Cytoplasmic Tail of H7N9 Virus Hemagglutinin
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作者 Xi Liu Li Ding +8 位作者 Jing Yuan Jian Liao Lian Duan Wenfei Wang Weiguo Tan Weiye Yu Boping Zhou Xinchun Chen Zheng Yang 《中国病毒学:英文版》 CAS CSCD 2019年第3期334-337,共4页
Dear Editor,H7N9 is a recently identified subtype of influenza A virus that caused a major outbreak in humans in China in 2013.According to the latest data provided by the Chinese Center for Disease Control and Preven... Dear Editor,H7N9 is a recently identified subtype of influenza A virus that caused a major outbreak in humans in China in 2013.According to the latest data provided by the Chinese Center for Disease Control and Prevention(http://www.moh.gov.cn/zwgk/yqbb3/ejlist.shtml,updated on October 31,2018),the mortality rate of H7N9 infections in China amounts to 39.7%(611/1536).Thus,H7N9 poses a serious public health threat. 展开更多
关键词 IDENTIFICATION NOVEL UNIVERSAL POTENTIAL EPITOPE Cytoplasmic Tail
Ecological and efficient polyculture Technology of sautéed mochitis mogulis 预览
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作者 Wanjun Zhao 《探索-水产科学与水产养殖》 2019年第1期10-12,共3页
Yunban (Ictalurus Nebraska),Also known as brown catfish,Genus catfish Formolidae,native to North America,is a freshwater breed of the United States.Diet is relatively broad,the meat is fresh and delicious,no muscle sp... Yunban (Ictalurus Nebraska),Also known as brown catfish,Genus catfish Formolidae,native to North America,is a freshwater breed of the United States.Diet is relatively broad,the meat is fresh and delicious,no muscle spines.It is a freshwater fish with high economic value..Oblique jaw (Plagognathops microlepis Bleek-Er),Cyprinidae,subfamily arinae,genus oblique jaw,middle and lower classes economic fishes,GuangzhouThe nutritional level of meat is high,and the market is well received by consumers..The internal quality of the fine-scale oblique jaw is tender and delicious,and the feeding habits are wide,and the feeding is simple and easy.As the mixed-breeding object,the yield per unit area and economic benefit can be improved without increasing the feed..The purpose of this experiment is to raise the microscaly oblique jaw by raising the polychaete Globus,in order to reduce the organic matter pollution and eutrophication degree of aquaculture water,and to reduce the water quality. 展开更多
关键词 Widely distributed RESERVOIRS FINS yellow or yellowish Middle Nitrogen Phosphorus Content in the breeding way reduce the OCCURRENCE of disease head down only the TAIL is SHAKING
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Antidepressant activity and HPTLC fingerprinting of stearic acid in different days of wheat seedlings 预览
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作者 Palanisamy Ravikumar Muthusamy Jeyam 《粮油科技:英文版》 2019年第1期6-10,共5页
Depression is a chronic,recurring and potentially life threatening illness and affects up to 20%of the world population and in the year 2020,depression will become the second most common disease in the world.To find t... Depression is a chronic,recurring and potentially life threatening illness and affects up to 20%of the world population and in the year 2020,depression will become the second most common disease in the world.To find the remedy from nutraceuticals,the present study was designed to evaluate the antidepressant activity of stearic acid(SA)and to quantify its maximum content in different dayold wheat seedlings and wheat grains.Forced swimming test(FST)and tail suspension test(TST)were done to evaluate the antidepressant activity of SA.HPTLC fingerprinting of SA was done in different days(3,5 and 7 d)of wheat seedlings and wheat grains to quantify its maximum content.In the antidepressant study,when compared with the control(326.67±3.02 s),SA showed potential antidepressant activity in TST(131.67±2.60 s)and SA also showed very good antidepressant activity in FST(124.83±5.37 s)when compared with the control(215.83±6.64 s).In HPTLC fingerprinting,the maximum content of SA was identified in 3-d-old wheat seedlings(89.43μg)when compared to wheat grains(84.69μg),5-d-old(86.43μg)and 7-d-old(85.32μg)wheat seedlings.Hence,the present study concludes that SA has a potential antidepressant activity and 3-d-old wheat seedlings are the essential sources of SA among the different dayold wheat seedlings. 展开更多
关键词 Depression Forced SWIMMING TEST TAIL suspension TEST Stearic acid HPTLC fingerprinting 3-d-old wheat SEEDLINGS
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煤矿刮板输送机支护系统的改造设计 预览
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作者 高宏杰 《机械管理开发》 2019年第8期37-38,共2页
针对山西离柳鑫瑞煤业公司刮板输送机固定出现的难题,结合实况,对刮板输送机的点杆、机头、机尾压柱进行了改造设计。本次改造实现了刮板输送机机头机尾底座的可调节支护,实践应用效果良好,可以全面推广应用。
关键词 刮板输送机 点杆 机头 机尾 可调节支护系统
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Tail asymptotic for discounted aggregate claims with one-sided linear dependence and general investment return
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作者 Fenglong Guo Dingcheng Wang 《中国科学:数学英文版》 SCIE CSCD 2019年第4期735-750,共16页
In this study, we investigate the tail probability of the discounted aggregate claim sizes in a dependent risk model. In this model, the claim sizes are observed to follow a one-sided linear process with independent a... In this study, we investigate the tail probability of the discounted aggregate claim sizes in a dependent risk model. In this model, the claim sizes are observed to follow a one-sided linear process with independent and identically distributed innovations. Investment return is described as a general stochastic process with cadlag paths. In the case of heavy-tailed innovation distributions, we are able to derive some asymptotic estimates for tail probability and to provide some asymptotic upper bounds to improve the applicability of our study. 展开更多
关键词 POISSON risk model TAIL probability ONE-SIDED linear process heavy-tailed distribution ASYMPTOTIC upper BOUND investment RETURN
烧结机除尘系统的升级改造 预览
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作者 李丽 《天津冶金》 CAS 2019年第A01期84-86,共3页
为满国家2020年将要执行的超低排放标准要求,天津天钢联合特钢有限公司实施了烧结机机头、机尾电除尘系统提升改造工程。主要论述了原有六台电除尘器的存在问题、改造内容以及实施效果,改造后颗粒物排放浓度达到国家超低排放的要求。
关键词 超低排放 机头 除尘器 机尾 烧结机
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Anti-inflammatory Effect of Heat-sensitive Moxibustion via the NF-κB Signaling Pathway on Cerebral Ischemia/Reperfusion Injury in Rats 预览
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作者 Aijiao Xiaoa Yisheng Xiaoa +2 位作者 Xin OuYang Lin He Mingren Chen 《医学科学进展杂志(英文)》 2018年第3期67-79,共13页
Ischemic stroke is universally acknowledged as a common cause of long-term disability or even death. Suspended moxibustion, an indirect form of moxibustion, is when moxibustion is placed superficially over the skin wi... Ischemic stroke is universally acknowledged as a common cause of long-term disability or even death. Suspended moxibustion, an indirect form of moxibustion, is when moxibustion is placed superficially over the skin without being in contact with it. Some researchers have used this method to treat stroke patients, but strong evidence of its therapeutic effectiveness is lacking. However, the effect of traditional suspended moxibustion has recently been improved with the development of heat-sensitive suspended moxibustion. Our previous studies showed that moxibustion for 35 min provided a more effective treatment strategy than moxibustion for 15 min, and moxibustion by 35 min with tail temperature increase had a better outcome than that without, however, the mechanism underlying the effect is not clear. In this study, we treated the stroke rats with moxibustion by 35min and divided them into non-heat sensitive moxibustion(NHSM) group and heat sensitive moxibustion (HSM) group according to difference in the tail temperature increase, then we compared the effect and investigated the mechanisms between NHSM and HSM. We found that HSM significantly decreased tail-flick latency, increased neurological function score, decreased infarct volume, reduced inflammatory cells, decreased the expression of inflammatory factor ICAM-1 and reduced the expression of NF-κB p65 and p-IKKα/β in rats with focal cerebral ischemia/reperfusion injury. Our experimental findings revealed that HSM exerted its anti-inflammatory and neuroprotective effects from MCAO-induced injury by decreasing the expression of the NF-κB signaling pathway. 展开更多
关键词 Auspended MOXIBUSTION HEAT-SENSITIVE MOXIBUSTION Middle CEREBRAL artery occlusion CEREBRAL ISCHEMIA/REPERFUSION injury Tail temperature Tail-flick LATENCY INFARCT volume Inflammatory cells CD11b ICAM-1 NF-κB p65 p-IKKα/β Traditional Chinese Medicine
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Performance analysis of variable speed tail rotors with Gurney flaps
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作者 Chen DONG Dong HAN Lei YU 《中国航空学报:英文版》 SCIE EI CAS CSCD 2018年第11期2104-2110,共7页
Gurney Flaps(GFs) are used for improving the performance of variable speed tail rotors. A validated analytical helicopter model able to predict the main and tail rotor power is utilized. The fixed height GF has substa... Gurney Flaps(GFs) are used for improving the performance of variable speed tail rotors. A validated analytical helicopter model able to predict the main and tail rotor power is utilized. The fixed height GF has substantially small influence on the tail rotor power in hover and low to medium speed forward flight, and can obtain significant power reduction in high speed flight.This ability can be enhanced by decreasing the tail rotor speed. With the deployment of GF, the collective pitch of the tail rotor decreases, and the maximum tail rotor thrust increases. The GF can compensate the reduction of the maximum thrust by the decrease in the tail rotor speed. The GF with a height of 5% of the chord length can almost remedy 50% of the thrust reduction introduced by decreasing 10% of the tail rotor speed. With the increase of GF height, the maximum thrust generated by the tail rotor increases. The GF with larger height can cause the increase in the tail rotor power in hover and low to medium speed flight. The retractable GF can obtain more power savings than the fixed height GF. However, the benefit is substantially small even in high speed flight. Considering the side effects introduced by the active GF, the fixed height GF may be more preferable. The mechanism for the retractable GF to generate more tail rotor thrust is to increase the lift in advancing side due to the higher dynamic pressure. 展开更多
关键词 TAIL ROTOR Variable SPEED Performance Gurney FLAP TAIL ROTOR THRUST FLAP height High SPEED FLIGHT
Tail regeneration reduction in lizards after repetitive amputation or cauterization reflects an increase of immune cells in blastemas
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作者 Lorenzo Alibardi 《动物学研究》 CAS CSCD 2018年第6期413-423,共11页
关键词 新生相 免疫力 房间 尾巴 蜥蜴 脊椎动物模型 电子显微镜 巨噬细胞
延伸句的句法分析
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作者 邓思颖 《语言教学与研究》 CSSCI 北大核心 2018年第3期48-57,共10页
延伸句由主体句和后续语两个部分组成。连词把主体句和后续语连接起来,组成联合结构。后续语重复主体句(部分)的内容,并通过自由省略和限制省略形成。本文假设延伸句在人类语言应有一定的普遍性,而后续语的多寡强弱,是造成语言差... 延伸句由主体句和后续语两个部分组成。连词把主体句和后续语连接起来,组成联合结构。后续语重复主体句(部分)的内容,并通过自由省略和限制省略形成。本文假设延伸句在人类语言应有一定的普遍性,而后续语的多寡强弱,是造成语言差异的因素。以延伸句作为理论框架,有助于探讨句法和话语接口的特点。 展开更多
关键词 延伸句 后续语 联合结构 英语 粤语
大型水陆两栖飞机T型尾翼颤振影响因素分析
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作者 吕继航 曾毅 罗琳胤 《飞行力学》 CSCD 北大核心 2018年第2期6-10,共5页
T型尾翼由于布局形式的特殊性,颤振行为往往较常规布局复杂。根据大型水陆两栖飞机的研制需求,建立了T型尾翼颤振分析的理论模型,并开展了T型尾翼缩比模型颤振风洞试验,研究了T型尾翼的颤振特性及来流迎角、部件连接刚度、操纵面连接刚... T型尾翼由于布局形式的特殊性,颤振行为往往较常规布局复杂。根据大型水陆两栖飞机的研制需求,建立了T型尾翼颤振分析的理论模型,并开展了T型尾翼缩比模型颤振风洞试验,研究了T型尾翼的颤振特性及来流迎角、部件连接刚度、操纵面连接刚度等因素对颤振特性的影响。理论和试验结果均表明,大型水陆两栖飞机T型尾翼的颤振临界型态为垂尾扭转型颤振,其主要影响因素为来流迎角;在给定的范围内,部件连接刚度、操纵面连接刚度均对垂尾扭转型颤振影响不大。研究结果为大型水陆两栖飞机的研制提供了依据。 展开更多
关键词 T型尾翼 颤振 影响因素 风洞试验
尾翼搭载固体火箭发动机壳体数值仿真及试验研究 预览
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作者 王云霞 马利锋 +1 位作者 张浩哲 涂四华 《强度与环境》 2018年第1期19-24,共6页
针对导弹尾翼搭载于固体火箭发动机壳体上这一特殊结构,建立3D有限元模型,进行内压与外载荷联合强度仿真计算,用于指导尾翼接头附近的壳体局部结构设计。并开展了相同载荷下尾翼搭载发动机壳体结构的静力试验,通过仿真计算及静力试验结... 针对导弹尾翼搭载于固体火箭发动机壳体上这一特殊结构,建立3D有限元模型,进行内压与外载荷联合强度仿真计算,用于指导尾翼接头附近的壳体局部结构设计。并开展了相同载荷下尾翼搭载发动机壳体结构的静力试验,通过仿真计算及静力试验结果的对比,表明仿真计算可以指导尾翼搭载发动机壳体的结构设计,且仿真计算结果与静力试验结果偏差为8.4%。 展开更多
关键词 固体火箭发动机 尾翼 数值仿真 静力试验
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The Horse's Tail and the Thief
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作者 呼振璞 《考试与评价(英语八年级专刊)》 2018年第12期42-43,共2页
从前,有五个商人出门做生意,他们每人都有一袋金子。一天,他们要穿过一片森林到一个镇子去。
关键词 马的小偷
Pancreatic stents for the prevention of post-endoscopic retrograde cholangiopancreatography pancreatitis should be inserted up to the pancreatic body or tail 预览
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作者 Mitsuru Sugimoto Tadayuki Takagi +11 位作者 Rei Suzuki Naoki Konno Hiroyuki Asama Yuki Sato Hiroki Irie Ko Watanabe Jun Nakamura Hitomi Kikuchi Yuichi Waragai Mika Takasumi Takuto Hikichi Hiromasa Ohira 《世界胃肠病学杂志:英文版》 SCIE CAS 2018年第22期2392-2399,共8页
AIM To investigate the location to which a pancreatic stent should be inserted to prevent post-endoscopic retrograde cholangiopancreatography(ERCP)pancreatitis(PEP).METHODS Over a ten-year period at our hospital,296 p... AIM To investigate the location to which a pancreatic stent should be inserted to prevent post-endoscopic retrograde cholangiopancreatography(ERCP)pancreatitis(PEP).METHODS Over a ten-year period at our hospital,296 patients underwent their first ERCP procedure and had a pancreatic stent inserted;this study included 147 patients who had ERCP performed primarily for biliary investigation and had a pancreatic stent inserted to prevent PEP.We divided these patients into two groups:131 patients with a stent inserted into the pancreatic head(head group)and 16 patients with a stent inserted up to the pancreatic body or tail(body/tail group).Patient characteristics and ERCP factors were compared between the groups.RESULTS Pancreatic amylase isoenzyme(p-AMY)levels in the head group were significantly higher than those in the body/tail group[138.5(7.0-2086)vs 78.5(5.0-1266.5),P=0.03][median(range)].No cases of PEP were detected in the body/tail group[head group,12(9.2%)].Of the risk factors for post-ERCP hyperamylasemia(≥p-AMY median,131 IU/L),procedure time≥60 min[odds ratio(OR)2.65,95%CI:1.17-6.02,P=0.02)and stent insertion into the pancreatic head(OR 3.80,95%CI:1.12-12.9,P=0.03)were identified as independent risk factors by multivariate analysis.CONCLUSION Stent insertion up to the pancreatic body or tail reduces the risk of post-ERCP hyperamylasemia and may reduce the risk of PEP. 展开更多
关键词 PANCREATIC stent ENDOSCOPIC RETROGRADE CHOLANGIOPANCREATOGRAPHY Post-endoscopic RETROGRADE CHOLANGIOPANCREATOGRAPHY pancreatitis Post-endoscopic RETROGRADE CHOLANGIOPANCREATOGRAPHY hyperamylasemia PANCREATIC body or TAIL
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T形尾翼非对称载荷设计分析 预览
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作者 唐朕 肖启之 《航空科学技术》 2018年第6期20-23,共4页
由于T形尾翼特殊的结构和气动布局形式,其临界载荷的确定除了要考虑对称载荷外,非对称载荷也有可能构成尾翼及后机身结构的设计情况。本文以CCAR25部为设计准则,系统分析了T形尾翼非对称载荷受载的模式与特点,给出了非对称载荷的分... 由于T形尾翼特殊的结构和气动布局形式,其临界载荷的确定除了要考虑对称载荷外,非对称载荷也有可能构成尾翼及后机身结构的设计情况。本文以CCAR25部为设计准则,系统分析了T形尾翼非对称载荷受载的模式与特点,给出了非对称载荷的分析方法与流程,并比较了各设计情况的临界载荷,最终确定出T形尾翼的非对称载荷设计工况。 展开更多
关键词 T形尾翼 非对称载荷 临界载荷
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Experimental manipulation of size and shape of tail spots and sexual selection in barn swallows
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作者 Anders P. MOLLER 《动物学报:英文版》 SCIE CAS CSCD 2017年第5期569-572,共4页
Barn swallows Hirundo rustica have white spots on their tail feathers, and they have been hypothe-sized to be a handicap because white spots are prone to feather breakage, ectoparasites are dispro-portionately common ... Barn swallows Hirundo rustica have white spots on their tail feathers, and they have been hypothe-sized to be a handicap because white spots are prone to feather breakage, ectoparasites are dispro-portionately common in white spots, and size of white spots increases with tail length. Here I testfor attractiveness of narrow and long tail spots by manipulation of their shape while using com-plete painting of spots and an absence of treatment as a control. Female barn swallows are knownto differentially invest in reproduction when mated to attractive males. Spot manipulation tookplace during laying of the first clutch, and there were no effects of treatment on clutch size or broodsize of first or second broods. In contrast, the incidence of second clutches and the total number ofeggs and fledglings produced during the breeding season was larger in males with painting of theside of tail spots rather than painting of the tip of spots, painting of entire spots, or no treatment.These findings are consistent with the hypothesis that it is the shape rather than the size of tailspots that affects differential reproductive effort by female barn swallows. 展开更多
关键词 Hirundo rustica RELIABLE signals SHAPE of TAIL spots TAIL spots.
Re-evaluation of thyroid hormone signaling antagonism of tetrabromobisphenol A for validating the T3-induced Xenopus metamorphosis assay
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作者 Yao Wang Yuanyuan Li +1 位作者 Zhanfen Qin Wuji Wei 《环境科学学报:英文版》 SCIE EI CAS CSCD 2017年第2期325-332,共8页
我们开发了导致 T3 的 Xenopus 变形试金,它应当能易感知地检测表明化学药品的混乱的甲状腺荷尔蒙(TH ) 。现在的学习试图由重新估计验证导致 T3 的 Xenopus 变形试金表明 tetrabromobisphenol A (TBBPA ) 的对抗的 TH,表明 disruptor... 我们开发了导致 T3 的 Xenopus 变形试金,它应当能易感知地检测表明化学药品的混乱的甲状腺荷尔蒙(TH ) 。现在的学习试图由重新估计验证导致 T3 的 Xenopus 变形试金表明 tetrabromobisphenol A (TBBPA ) 的对抗的 TH,表明 disruptor 的已知的 TH。根据我们开发了的试金,在舞台 52 点的 Xenopus 蝌蚪暴露于 10-500 ? nmol/L TBBPA 面对 1 ? nmol/L T3。在 96 以后?暴露的 hr ,在 10-500 的范围的 TBBPA ? nmol/L 被发现显著地以身体重量和四个词法端点包括头区域以一种集中依赖者方式禁止 Xenopus 蝌蚪的 导致T3 的词法变化(哈),嘴宽度( MW ),单方的大脑宽度/大脑长度( ULBW/BL ),和后部手足的 length/snout-vent 长度( HLL/SVL )。结果证明我们开发了的这些端点为在导致 T3 的变形上描绘 TBBPA 的对抗效果是敏感的。跟随 24-hr 暴露,我们发现 TBBPA 在尾巴反对了导致 T3 的 TH 反应基因的表示,它与在肠的以前的调查结果一致。我们建议尾巴能作为其他的纸巾被使用到肠为评估表明混乱的 TH 检验分子的端点。在结论,我们的结果证明我们开发了的导致 T3 的 Xenopus 变形试金是在为检测表明混乱的 TH 的 vivo 试金的理想。 展开更多
关键词 非洲爪蟾 四溴双酚A 甲状腺激素 激素信号 T3 诱导 变态 低出生体重
某运动型轿车尾翼攻角变化对气动力影响的仿真分析
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作者 田哲文 张罗亮 +1 位作者 胡晓霏 谢鑫 《武汉理工大学学报》 北大核心 2017年第7期66-70,共5页
为了研究加装尾翼及调节不同的尾翼攻角对车辆气动力的影响,通过CATIA逆向工程技术建立了某运动型轿车的CAD三维模型。运用ANSYS Fluent对车身表面压力及附近流场进行模拟仿真,得出了不同尾翼攻角下阻力系数、负升力系数的变化规律,分... 为了研究加装尾翼及调节不同的尾翼攻角对车辆气动力的影响,通过CATIA逆向工程技术建立了某运动型轿车的CAD三维模型。运用ANSYS Fluent对车身表面压力及附近流场进行模拟仿真,得出了不同尾翼攻角下阻力系数、负升力系数的变化规律,分析了其对车辆操纵稳定性的影响。分析了车身尾部流场随攻角的变化,得到了能引导尾部气流平稳汇合的攻角范围。为以后进行相关分析和尾翼攻角的调整提供了参考。 展开更多
关键词 运动型轿车 气动力 尾翼 攻角
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