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嘉兴刺绣小围身的艺术特征与人文内涵研究 被引量:5
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作者 陈淑聪 《丝绸》 CAS CSCD 北大核心 2015年第4期48-52,共5页
从艺术和人文角度对嘉兴民间服饰小围身进行研究,并分别从其艺术特色、类型、造型形态、工艺结构特征、图案艺术特色及其所包含的民俗文化渊源等因素,展开了全方位的论证剖析。研究表明,刺绣小围身不仅是中国传统民间服饰重要的装饰部件... 从艺术和人文角度对嘉兴民间服饰小围身进行研究,并分别从其艺术特色、类型、造型形态、工艺结构特征、图案艺术特色及其所包含的民俗文化渊源等因素,展开了全方位的论证剖析。研究表明,刺绣小围身不仅是中国传统民间服饰重要的装饰部件,还是中国传统民俗文化和中国历史重要的表现形式和组成部分,是民族精神的物化形式,是传统女性文化的象征,反映了人们群众内心的美好愿望与追求和谐、完整、圆满的文化意蕴。这对当今刺绣艺术的传承和发展具有深远的意义。 展开更多
关键词 刺绣 小围 艺术特征 工艺结构 人文内涵 嘉兴
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潼湖大堤内赤岗小围决堤成因分析 被引量:1
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作者 肖可明 《广东水利水电》 2000年第5期31-33,共3页
关键词 潼湖大堤 赤岗小围 决堤 成因分析
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康熙皇帝与木兰秋狝 被引量:5
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作者 张雪峰 《历史教学》 北大核心 2003年第6期76-78,共3页
康熙皇帝执政期间,北部边疆很不太平.沙俄殖民主义势力不断东侵,蚕食中国领土,严重威胁着中国北部边疆的安宁;厄鲁特蒙古之一部噶尔丹乘机勾结沙俄发动叛乱,企图称霸全蒙古.面对这种形势,为加强蒙古各部与中央政权的联系,以巩固国家统一... 康熙皇帝执政期间,北部边疆很不太平.沙俄殖民主义势力不断东侵,蚕食中国领土,严重威胁着中国北部边疆的安宁;厄鲁特蒙古之一部噶尔丹乘机勾结沙俄发动叛乱,企图称霸全蒙古.面对这种形势,为加强蒙古各部与中央政权的联系,以巩固国家统一,遏制沙俄进一步东侵和噶尔丹的叛乱活动,康熙皇帝在蒙古地区采取了推行盟旗制度,树立黄教中心,发展农牧业生产,实行满蒙通婚,建设驿站,木兰秋狝,兴建避暑山庄等一系列有效的、逐步把蒙古各部建成戍守祖国边疆坚强长城的政治、经济、军事措施.其中,木兰秋狝和兴建避暑山庄发挥了独特的作用. 展开更多
关键词 康熙皇帝 木兰秋狝习俗 木兰 小围 哨鹿
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活性炭吸附脱附+RTO焚烧工艺在处理轮胎企业硫化工序废气上研究与应用
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作者 顾建 包捡青 王斌 《橡塑技术与装备》 CAS 2022年第4期61-65,共5页
全钢子午线轮胎硫化工序是在轮胎生产过程中,将成型胎胚通过活络模压制成轮胎成品的一个过程。轮胎在该工序会经历加温加压的过程,所以会集中产生大量的烟气。该工序产生烟气具有浓度低,风量大等特点,在收集和治理上难度很大。针对我公... 全钢子午线轮胎硫化工序是在轮胎生产过程中,将成型胎胚通过活络模压制成轮胎成品的一个过程。轮胎在该工序会经历加温加压的过程,所以会集中产生大量的烟气。该工序产生烟气具有浓度低,风量大等特点,在收集和治理上难度很大。针对我公司硫化工序产生的有机废气浓度低,气量大等特点,治理方案采用小围罩密闭+活性炭吸附+RTO焚烧工艺。通过完善的收集,设定自动收集功能,设置异常安全程度,使废气收集及治理设备稳定运行。烟气的治理方案,综合解决烟气直排等环保问题,同时治理后的废气达到国家及地方相关环保法律法规排放标准。 展开更多
关键词 橡胶轮胎制造 硫化工序 小围 活性炭吸附+RTO焚烧
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对洞庭湖平原地区城市防洪规划的思考
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作者 孟熊 黎昔春 +2 位作者 高碧 贺方舟 王维俊 《湖南水利水电》 2022年第4期59-62,共4页
在现有洞庭湖平原区城市防洪工程规划和建设中,城市防洪圈建设有“小围”和“大围”两种方案,防洪标准按照规范要求采用。文章对比分析了“小围”、“大围”方案的利弊、“二期治理”和城市防洪设计标准、设计水位及洞庭湖区水文特性,... 在现有洞庭湖平原区城市防洪工程规划和建设中,城市防洪圈建设有“小围”和“大围”两种方案,防洪标准按照规范要求采用。文章对比分析了“小围”、“大围”方案的利弊、“二期治理”和城市防洪设计标准、设计水位及洞庭湖区水文特性,提出沅江、南县、澧县、汉寿、安乡、华容等位于洞庭湖区重点垸内的县级城市防洪圈总体布局可采用“大围”方案,防洪标准直接采用洞庭湖“二期治理”的设计标准。研究成果对于洞庭湖平原区及类似地区的城市防洪规划和建设具有指导和借鉴意义。 展开更多
关键词 洞庭湖 重点垸 城市防洪 防洪标准 小围 “大
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读者活动透视
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作者 鲁珊 《华夏人文地理》 2001年第5期122-123,共2页
在小围村的考察 初秋的一天,<华夏人文地理>读者俱乐部的成员们来到深圳东部郊区的小围村,考察当地的人文环境和生态环境.之所以选择小围村,是因为此地具有依山、傍河、靠海等较为复杂的地理位置,且目前外界事物介入不是很多,自... 在小围村的考察 初秋的一天,<华夏人文地理>读者俱乐部的成员们来到深圳东部郊区的小围村,考察当地的人文环境和生态环境.之所以选择小围村,是因为此地具有依山、傍河、靠海等较为复杂的地理位置,且目前外界事物介入不是很多,自然生态和人文环境保持得相对完好.我们还特地邀请了仙湖植物园的陈珍传老师,使我们能较为专业化地调查小围村的植物种类和生态.此外,同行的俱乐部成员还有进行过多次田野调查和有动植物考察经验的行家里手. 展开更多
关键词 《华夏人文地理》 读者俱乐部 人文环境 生态环境 小围
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Sensitivity analyses of cables to suspen-dome structural system 被引量:7
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作者 高博青 翁恩豪 《Journal of Zhejiang University Science》 EI CSCD 2004年第9期1045-1052,共8页
The construction of the cables is a key step for erecting suspen-dome structures. In practical engineering, it is difficult to ensure that the designed pre-stresses of cables have been exactly introduced into the stru... The construction of the cables is a key step for erecting suspen-dome structures. In practical engineering, it is difficult to ensure that the designed pre-stresses of cables have been exactly introduced into the structures in the site; so it is necessary to evaluate the influence of the variation of the pre-stresses on the structural behavior. In the present work, an orthogonal design method was employed to investigate the pre-stressed cables' sensitivity to the suspen-dome system. The investigation was concentrated on a Kiewitt suspen-dome. Parametric studies were carried out to study the sensitivity of the structure's static behavior, dynamic behavior, and buckling loads when the pre-stresses in the cables varied. The investigation indicated that suspen-dome structures are sensitive to the pre-stresses in all cables; and that the sensitivity depended on the location of the cables and the kind of structural behavior. Useful suggestions are given at the end of the paper. 展开更多
关键词 SUSPEN-DOME Orthogonal design method CABLE Sensitivity analysis
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Interaction of Pb and Cd in Soil Water Plant System and Its Mechanism: II. Pb Cd Interaction in Rhizosphere *1 被引量:17
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作者 CHENHUAIMAN LINQI 《Pedosphere》 SCIE CAS CSCD 1998年第3期237-244,共8页
The interaction of Pb Cd can be observed not only in the uptake process of elements by plants and in their influence on the growth, but also in rhizosphere. The changes in extractable Cd and Pb concentrations in the ... The interaction of Pb Cd can be observed not only in the uptake process of elements by plants and in their influence on the growth, but also in rhizosphere. The changes in extractable Cd and Pb concentrations in the rhizosphere soil of rice plants, root exudates from wheat and wheat plant and their complexing capacity with Pb and Cd were investigated under different Pb and Cd treatments. Results showed that the concentration of extractable Cd in the rhizosphere of rice in red soil was markedly increased by Pb Cd interaction. It increased by 56% in the treatment with Pb and Cd added against that in the treatment with only Cd added in soil. The considerable differences in both composition and amount of root exudate from wheat and rice were found among different treatments. Pb and Cd might be complexed by root exudates. The concentrations of free Pb and Cd in the solution were increased markedly by adding root exudate from wheat and decreased by that from rice due to Pb Cd interaction. The distribution patterns of Pb and Cd in roots were affected by Pb Cd interaction, which accelerated transport of Pb into internal tissue and retarded accumulation of Cd in external tissue. 展开更多
关键词 CD INTERACTION PB red soil rhizosphere of rice and wheat
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Responses of Nitrogen and Related Enzyme Activities to Fertilization in Rhizosphere of Wheat 被引量:29
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作者 YUANLING YUSHANGQI 《Pedosphere》 SCIE CAS CSCD 1997年第2期141-148,共8页
In the present experiment, wheat seedlings (Trticucum aestivum L.) were grown on a purple soil withvarious fertilizer treatments in order to investigate the responses of nitrogen and related eusyme activitiesin the rh... In the present experiment, wheat seedlings (Trticucum aestivum L.) were grown on a purple soil withvarious fertilizer treatments in order to investigate the responses of nitrogen and related eusyme activitiesin the rhizosphere. The results revealed the increments of both organic matter and total N in the soil withthe proximity to the growing roots, especially in the treatment of supplying pig manure in combination withchemical fertilizer, suggesting that they could come from root and microorganism exudation which could beintensified by inorganic-organic fertilization, being of benefit to improving the physical and biological envi-ronment in the rhizosphere of wheat. Much more inorganic N was observed in the fertilized soils surroundingwheat roots than in the CK treatment, indicating the improvement of crop N supply in the rhisosphere ofwheat by fertilization.The activities of invertase, urease and protease in the root zone were greatly enhanced as compared tothose in the other parts of soils except that the urease activities were similar in the rhizo8phere and nonrhi-zosphere of the CK and pig manure treatments, indicating that invertase and protease could be produced bygrowing roots and rhizosphere microorganisms, in contrast to urease which could be stimulated by urea. Also,significant increment of these three enzyme activities in the rhizosphere of wheat by fertilizatioll, especially byapplication of chemical fertilizer combined with pig manurel suggested that fertilization not only acceleratedthe renewal of organic matter but also enhanced bioavailability of organic N in that soil zone. This couldbe the reason why the total amount of inorganic N available for plants was increased more obviously in therhizosphere of wheat of the fertilization treatments than in that of the CK treatment. 展开更多
关键词 NITROGEN RHIZOSPHERE soil enzyme WHEAT
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Phosphorus Uptake from Rhizosphere Soil by Two Wheat Cultivars 被引量:4
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作者 MAJIAN T.S.GAHOONIA 《Pedosphere》 SCIE CAS CSCD 1998年第4期325-330,共6页
Inorganic soil phosphorus extractable with sodium bicarbonate (NaHCO3-Pi), soil pH and root hairs length and density in the rhizosphere of two winter wheat cultivars (Triticum aestivum L. cv. Shichun,Sleipner) grown o... Inorganic soil phosphorus extractable with sodium bicarbonate (NaHCO3-Pi), soil pH and root hairs length and density in the rhizosphere of two winter wheat cultivars (Triticum aestivum L. cv. Shichun,Sleipner) grown on a high pH Chinese silt loam (52.7 mg NaHCO3-Pi kg-1) and a Danish sandy loam (43.4mg NaHCO3-Pi kg-1) were studied to assess how these wheat cultivars differed in phoephorus uptake.The rhizosphere soil pH of two wheat cultivars grown on the two soils were fairly unchanged with increasing distance from the root surface. However the root hairs of Shichun were 2.1 times longer than those of Sleipner. Root surface area (RSA) of Shichun increased by 192% due to root hairs whereas root hairs of Sleipner increased RSA by 68% only. Hence the root system of Shichun was in contact with more soil than that of Sleipner, even though Sleipner had a longer root. Grown at the lower pH and level of NaHCO3-Pi in the Danish soil Shichun absorbed more inorganic phosphorus than Sleipner whereas at the higher pH and level of NaHCO3-Pi in the Chinese soil there was no phosphorus uptake difference between the two wheat cultivars. 展开更多
关键词 inorganic phosphorus PH RHIZOSPHERE root hair wheat cultivar
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Plasminogen Activator and Plasminogen Activator Inhibitor in Mouse Ovaries during Periovulatory Periods 被引量:2
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作者 刘以训 冯强 胡召元 《Developmental and Reproductive Biology》 1992年第1期2-6,T001-T003,共8页
Changes of ovarian tPA,uPA and PA inhibitor activities were examined in PMSG-and hCG-treatedimmature mice during periovulatory periods.The results show that 15% of the gonadotropin-treatedanimals ovulated 8 hrs after ... Changes of ovarian tPA,uPA and PA inhibitor activities were examined in PMSG-and hCG-treatedimmature mice during periovulatory periods.The results show that 15% of the gonadotropin-treatedanimals ovulated 8 hrs after hCG administration,about 6-8 hrs earlier than in rat.It is also shownthat not only tPA activity,but also uPA activity,was regulated by gonadotropins in ovarianhomogenates and granulosa cells,and they reached maximum prior to ovulation.No measurableamount of PAI-1 activity could be detected in mouse granulosa cell conditioned medium andfollicular fluid,but considerable amount of α_2-antiplasmin,a specific inhibitor for plasmin,wasfound in follicular fluid.Cumulus-oocyte complexes contain mainly tPA.Since the ovulated eggsstill have high tPA activity,it is thought that the enzyme in the oocyte may play an important rolein implantation. 展开更多
关键词 Plasminogen activator A_2-antiplasmin Granulosa cells Cumulus-oocyte complexes OVULATION
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Extreme value distributions of mixing two sequences with different MDA's 被引量:2
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作者 蒋岳祥 《Journal of Zhejiang University Science》 CSCD 2004年第5期509-517,共9页
Suppose {Xi, i≥1} and {Yi, i≥1} are two independent sequences with distribution functions FX(x) and FY(x), respectively. Zi is the combination of Xi and Yi with a probability pn for each i with 1≤i≤n. The extreme ... Suppose {Xi, i≥1} and {Yi, i≥1} are two independent sequences with distribution functions FX(x) and FY(x), respectively. Zi is the combination of Xi and Yi with a probability pn for each i with 1≤i≤n. The extreme value distribution ,n GZ(x) of this particular triangular array of the i.i.d. random variables Z1, , Z2, ,…, Zn n n ,nis discussed. We found a new form of the extreme value distribution ΛA(ρx)Λ(x)(0<ρ <1), which is not max-stable. It occurs if FX(x) and FY(x) belong to the same MDA(Λ). GZ(x) does not exist as mixture forms of the different types of extreme value distributions. 展开更多
关键词 Extreme value distribution Maximum domain of attraction(MDA) Mixed distribution functions
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Analysis of penetration acceleration signal based on wavelet transformation
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作者 王春常 顾强 安晓红 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2015年第3期223-228,共6页
In order to analyze the composition and frequency distribution of acceleration signal in the process of projectile penetrating,this paper uses wavelet transform to decompose penetration acceleration signal to get the ... In order to analyze the composition and frequency distribution of acceleration signal in the process of projectile penetrating,this paper uses wavelet transform to decompose penetration acceleration signal to get the distribution of penetration acceleration signal in different frequency bands.Compared with the ideal acceleration signal curve and its characteristics,it can be concluded that the frequency range of the acceleration signal in the axis of the projectile and the vibration frequency range of the projectile are 31.25-62.5kHz and 62.5-125 kHz,respectively.Finally,the penetration acceleration signal curve is obtained by Simulink. 展开更多
关键词 penetration process wavelet transform ACCELERATION frequency distribution
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An Invisible Existence Between Life and Death in Al-Koni's The Bleeding of the Stone
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作者 Majed Alenezi 《Journal of Literature and Art Studies》 2018年第8期1149-1158,共10页
The Bleeding of Stone traces a philosophical concept related to the existence of humankind. The uniqueness of the story's setting and the main character provide a metaphysical ontological dimension. The notion of the... The Bleeding of Stone traces a philosophical concept related to the existence of humankind. The uniqueness of the story's setting and the main character provide a metaphysical ontological dimension. The notion of the metaphysical existence is drawn into public within the atmosphere of the novel through certain elements; religion, time and space, and freedom. The present paper investigates on these factors and their roles and relations to convey and reach a metaphysical ontology. I argue, in this paper, that the metaphysical existence is established as a state between life and death. This state is created through a dialectical relationship between man and desert where there are unseen struggles between the two for immortality. However, the ultimate result of losing the battle is known for the man, yet deliberately ignored because oftke instinct for immortality 展开更多
关键词 ECOCRITICISM Ibrahim Al-Koni postcolonial literatura
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Influences of Root Zone Restriction and Nitrogen Nutrition on Hybrid Wheat Growth
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作者 ZHANGRONGIAN SHENZHENGUO 《Pedosphere》 SCIE CAS CSCD 1997年第2期171-176,共6页
To study the physiological effects of small root zonel plants of a hybrid wheat variety (Triticum aestivnmL.cv. Meiyou 4) were grown in small pots (1 litre) or large pots (8 litre) with 1ow nitrogen (50 mg kg-1 soil)a... To study the physiological effects of small root zonel plants of a hybrid wheat variety (Triticum aestivnmL.cv. Meiyou 4) were grown in small pots (1 litre) or large pots (8 litre) with 1ow nitrogen (50 mg kg-1 soil)and high nitrogen (200 mg kg-1 soil). Restricting root zone decreased dry weight of plants at the stages ofstem elongation and flowering, compared to those of control plants grown in the large pots (P<0.01). Sprayingof 6-benzylaminopurine (50 μmol L-1) increased dry weight of plants and chlorop hyll concentration in leaves.Restriction of root zone decreased the concentrations of total nitrogen, chlorophyll and soluble protein in thefiag leaf and acce1erated senescence of the leaves. Supply of high nitrogen delayed senescence of the fiag leafThe results suggested that the shortage of nutrients, especially nitrogen deficiency was the primary reasonfor the decreased growth of plant in the treatment of root zone restriction. 展开更多
关键词 flag leaf hybrid wheat NITROGEN root zone restriction SENESCENCE
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Calculating minimum perforating depth with consideration of plastic deformation around well-hole
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作者 罗勇 《Journal of Coal Science & Engineering(China)》 2007年第2期140-143,共4页
In order to obtain the perforation depth, the three zones with different permeability because of plastic deformation and fluid invasion were studied based on related theories. The study shows that the calculation of p... In order to obtain the perforation depth, the three zones with different permeability because of plastic deformation and fluid invasion were studied based on related theories. The study shows that the calculation of perforation depth should take account of not only damaged zone, but also plastic zone, because the plastic zone has much lower permeability. The required minimum perforation depth was obtained by making the solution of elastic/plastic equations, and the factors affecting perforation depth were analyzed accordingly. 展开更多
关键词 elastoplasticity perforation depth reservoir permeability technology ofshielded temporary plugging
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Effect of temperature on the standard metabolic rates of juvenile and adult Exopalaemon carinicauda 被引量:2
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作者 张成松 李富花 相建海 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2015年第2期381-388,共8页
Ridgetail white prawn (Exopalaemon carinicauda) are of significant economic importance in China where they are widely cultured. However, there is little information on the basic biology of this species. We evaluated... Ridgetail white prawn (Exopalaemon carinicauda) are of significant economic importance in China where they are widely cultured. However, there is little information on the basic biology of this species. We evaluated the effect of temperature (16, 19, 22, 25, 28, 31, and 34℃) on the standard metabolic rates (SMRs) of juvenile and adult E. carinicauda in the laboratory under static conditions. The oxygen consumption rate (OCR), ammonia-N excretion rate (AER), and atornic ratio of oxygen consumed to nitrogen consumed (O:N ratio) of juvenile and adult E. carinicauda were significantly influenced by temperature (P〈0.05). Both the OCR and AER of juveniles increased significantly with increasing temperature from 16 to 34℃, but the maximum OCR for adults was at 31℃. Juvenile shrimp exhibited a higher OCR than the adults from 19 to 34℃. There was no significant difference between the AERs of the two life-stages from 16 to 31 ℃ (P〉0.05). The O:N ratio in juveniles was significantly higher than that in the adults over the entire temperature range (P〈0.05). The temperature coefficient (Q_10) of OCR and AER ranged from 5.03 to 0.86 and 6,30 to 0.85 for the adults, respectively, and from 6,09-1.03 and 3.66-1.80 for the juveniles, respectively. The optimal temperature range for growth of the juvenile and adult shrimp was from 28 to 31℃, based on Q_10 and SMR values. Results from the present study may be used to guide pond culture production ofE. carinicauda. 展开更多
关键词 ammonia-N excretion rate (AER) O:N ratio oxygen consumption rate (OCR) temperature temperature coefficient
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Perioperative chemotherapy of stage Ⅲ N2 non-small cell lung cancer
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作者 Yongfeng Yu Shun Lu 《The Chinese-German Journal of Clinical Oncology》 CAS 2009年第4期185-189,共5页
Patients with stage Ⅲ N2 non-small cell lung cancer (NSCLC) are more than one third of all NSCLC patients. The 5-year survival rate of them is approximately 15%. From therapeutic views, stage ⅢA N2 of 97 Internati... Patients with stage Ⅲ N2 non-small cell lung cancer (NSCLC) are more than one third of all NSCLC patients. The 5-year survival rate of them is approximately 15%. From therapeutic views, stage ⅢA N2 of 97 International Lung Cancer Staging System is an obvious hetero-combination, which includes mediastinal lymph node metastasis based on microscope after postoperative examination and N2 of single station or N2 of multiple stations based on computerized tomographic scanning and N2 of mediastinal lymph node mixed together. The different status of stage N2 lead to different prognosis. Andre et al reported the results of continuous surgery in 702 patients with NSCLC, which showed that N2 of single station based on microscope, 5-year survival rate was 34% (244 cases), N2 of multiple stations based on microscope, 5-year survival rate was 11% (788 cases), N2 of single station based on radiograph, 5-year survival rate was 8% (118 cases), 展开更多
关键词 CHEMOTHERAPY non-small cell lung cancer (NSCLC) STAGE
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The effects on surgery and preoperative patients with non-small cell lung cancer by preoperative bronchial artery infusion chemotherapy
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作者 Shuhong Tang Jilai Bian Mingwu Li 《The Chinese-German Journal of Clinical Oncology》 CAS 2008年第8期447-450,共4页
Objective: To study the efficiency, safety and feasibility of preoperative bronchial artery infusion (BAI) chemotherapy on operation in patients with locally advanced (stage Ⅲ) non-small cell lung cancer (NSCLC... Objective: To study the efficiency, safety and feasibility of preoperative bronchial artery infusion (BAI) chemotherapy on operation in patients with locally advanced (stage Ⅲ) non-small cell lung cancer (NSCLC). Methods: 92 cases with locally advanced NSCLC patients were randomly divided into two groups: (1) BAI chemotherapy group: 39 cases were received BAI chemotherapy for 2 courses and followed surgery; (2) surgery alone group: 51 cases were treated by operation alone. The complete resection rate and preoperative complications were compared between these two groups. Results: In BAI chemotherapy group, the rate of clinical efficiency was 68.3% with slight toxicity. In BAI chemotherapy group the surgery complete resection rate was 89.7%, which was significantly higher than that in surgery alone group (72.5%, P 〈 0.05). No significant differences of blood loss, operative complications and mortality were observed between these two groups. Conclusion: BAI neoadjuvant chemotherapy was safe and effective, which can increase the complete resection rate of the tumor and did not increase the operative complications and mortality. 展开更多
关键词 non-small cell lung cancer (NSCLC) neoadjuvant chemotherapy bronchial artery infusion (BAI) SURGERY
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Global patterns of species richness of the holarctic alpine herb Saxifraga:the role of temperature and habitat heterogeneity 被引量:2
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作者 Lian Liu Xiaoting Xu +11 位作者 Lei Zhang Yaoqi Li Nawal Shrestha Danilo M.Neves Qinggang Wang Hong Chang Xiangyan Su Yunpeng Liu Jianyong Wu Dimitar Dimitrov Zhiheng Wang Jianquan Liu 《Journal of Plant Ecology》 SCIE CSCD 2022年第2期237-252,共16页
The effects of contemporary climate,habitat heterogeneity and long-term climate change on species richness are well studied for woody plants in forest ecosystems,but poorly understood for herbaceous plants,especially ... The effects of contemporary climate,habitat heterogeneity and long-term climate change on species richness are well studied for woody plants in forest ecosystems,but poorly understood for herbaceous plants,especially in alpine–arctic ecosystems.Here,we aim to test if the previously proposed hypothesis based on the richness–environment relationship could explain the variation in richness patterns of the typical alpine–arctic herbaceous genus Saxifraga.Using a newly compiled distribution database of 437 Saxifraga species,we estimated the species richness patterns for all species,narrow-and wide-ranged species.We used generalized linear models and simultaneous autoregressive models to evaluate the effects of contemporary climate,habitat heterogeneity and historical climate on species richness patterns.Partial regressions were used to determine the independent and shared effects of different variables.Four widely used models were tested to identify their predictive power in explaining patterns of species richness.We found that temperature was negatively correlated with the richness patterns of all and wide-ranged species,and that was the most important environmental factor,indicating a strong conservatism of its ancestral temperate niche.Habitat heterogeneity and long-term climate change were the best predictors of the spatial variation of narrow-ranged species richness.Overall,the combined model containing five predictors can explain ca.40%–50%of the variation in species richness.We further argued that additional evolutionary and biogeographical processes might have also played an essential role in shaping the Saxifraga diversity patterns and should be considered in future studies. 展开更多
关键词 climate change Last Glacial Maximum niche conservatism range size water–energy dynamics
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