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  demand
     Soybean Economy in China: with focus on Supply and Demand
     我国的大豆经济:供给与需求的重点分析
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     The Theory and Application of a Predicative Analysis on the Demand for Water Conservancy in Social and Economic Development
     社会经济可持续发展对水利需求的理论与实践
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     The Research on Optimization and Coordination of Supply Chain Inventory Decision-making Based on Time-varying Demand
     基于时变需求的供应链库存决策优化与协调研究
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     Supply Chain Contract Models with Stochastic Demand
     具有随机市场需求的供应链契约模型研究
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     Information Credibility on User Demand
     基于用户需求的信息可信度研究
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     The Representation, Acquisition and Inference of Personalized Requirements: A Case Study
     个性化需求的描述、获取与推断—案例研究
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     Research on the Key Technology of Requirement Oriented Innovative Design for Principle Scheme of Mechanical Products
     面向需求的机械产品原理方案创新设计关键技术研究
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     Fuzzy Represention of Firm's Demands Under the Soft Budget Constraints
     软约束下企业需求的模糊表示
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     A Study of Document Needs of Biological Master Postgraduate
     关于生物学学位研究生文献需求的研究
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     THE GREY PREDICTION MODEL APPLICATION FOR ELECTRIC POWER DEMANDED IN A CITY
     城市电力需求的灰色预测模型及其应用
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     CUSTOMER DEMAND
     用户需求
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     Require ment pattern
     需求模式
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     Reflections on "Spurring Demand
     需求拉动思考
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     Nutrient Requirement of Basses
     鲈鱼营养需求
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Non-invasive vaccine delivery is in demand and for this skin appears to be a potential sites that elicit immune responses.
      
All customers demand the first "essential" service, whereas only some of them demand the second "multi-optional" service.
      
A method for identifying the writing age of blue ballpoint pen ink has been established due to the imperative demand in forensic laboratories.
      
The controller does not require online optimization and the huge calculation burden can be avoided, so that the demand of real-time control can be satisfied.
      
To meet the demand of automatic pruning machines, this paper presents a new method for dynamic automatic identification of standing tree limbs and capture of the digital images of Platycladus orientalis.
      
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The investigation on the breeding habits of Rana nigromaculata was carried out from March 15 to May 10, 1957 in the suburbs of Nanchang.The investigation was carried out in nine different places.Breeding of R. nigromaculata was usually found in places of clear water, where there is little corruption, amino-acid and CO_2, The value of pH is5.9—6.9.The breeding places show a close relationship with the distribution of animals and plants, existence of water furrows and the tilling of rice fields. Range of temperature...

The investigation on the breeding habits of Rana nigromaculata was carried out from March 15 to May 10, 1957 in the suburbs of Nanchang.The investigation was carried out in nine different places.Breeding of R. nigromaculata was usually found in places of clear water, where there is little corruption, amino-acid and CO_2, The value of pH is5.9—6.9.The breeding places show a close relationship with the distribution of animals and plants, existence of water furrows and the tilling of rice fields. Range of temperature for breeding (6:30—8:30 A.M.) is 11.5—22℃, 11.5--17℃ being found to be most suitable for breeding.Breeding takes place when the temperature drops abruptly after an increase.In suburbs of Nanchang, the breeding of R. nigromaculata takes place from March 26 to April 20, and the breeding occurs most frequently duringApril 3—16.Breeding takes place in water less than 10 cm. in depth in the water furrows and rice fields. It is because: 1) the temperature of water rises rather quickly in shallow water; 2) shallow water contains much oxygen neces-sary for the development of the embryos.The breeding of R. nigromaculata was found to occur in places different from the breeding grounds for Bufo bufo.Number of eggs in one brood is found to vary from 786 to 5114.

1、以青蛙(Rana nigromaculata)为对象,从1957年3月15日到5月10日在南昌近郊进行了产卵习性的调查。 2、调查是以九个不同环境條件的地区作为恆定工作地区來进行的。同時,还逐日作了调查期间內氣温和水温的记载。(以上午6时30分-8时30分为标准。) 3、调查证明:青蛙喜欢产卵於腐植质少、氨基酸与CO_2含量较少的清洁环境內,pH值为5.9-6.9之间,产卵地区与水中动植物的分布、浅水沟的存在和稻田的耕作也有密切的关系。 4、产卵的温度幅度(以上午6时30分-8时30分为标准)为11.5-22℃,而以11.5-17℃最為適宜。 产卵是在温度上升后突然下降(冷的)刺激下进行的。 由此推知:在南昌近郊,青蛙产卵是在清明节前10天到清明节后15天內进行的。而以清明节前后十多天(4月3日到4月16日)內产卵最多。 5、产卵是在水深浅於10厘米的浅水沟和稻田內进行的,这是因为:(1)水浅水温易於上升,(2)水浅可以溶解大量的氧;大量氧的存在才能适应蛙胚发育的需求。 6、青蛙产卵地区与蟾蜍产卵地区截然不同,这可能与成体的生活习性有关。 7、青蛙是一次产卵的,产卵的数目为786-5,114个,这与王希成...

1、以青蛙(Rana nigromaculata)为对象,从1957年3月15日到5月10日在南昌近郊进行了产卵习性的调查。 2、调查是以九个不同环境條件的地区作为恆定工作地区來进行的。同時,还逐日作了调查期间內氣温和水温的记载。(以上午6时30分-8时30分为标准。) 3、调查证明:青蛙喜欢产卵於腐植质少、氨基酸与CO_2含量较少的清洁环境內,pH值为5.9-6.9之间,产卵地区与水中动植物的分布、浅水沟的存在和稻田的耕作也有密切的关系。 4、产卵的温度幅度(以上午6时30分-8时30分为标准)为11.5-22℃,而以11.5-17℃最為適宜。 产卵是在温度上升后突然下降(冷的)刺激下进行的。 由此推知:在南昌近郊,青蛙产卵是在清明节前10天到清明节后15天內进行的。而以清明节前后十多天(4月3日到4月16日)內产卵最多。 5、产卵是在水深浅於10厘米的浅水沟和稻田內进行的,这是因为:(1)水浅水温易於上升,(2)水浅可以溶解大量的氧;大量氧的存在才能适应蛙胚发育的需求。 6、青蛙产卵地区与蟾蜍产卵地区截然不同,这可能与成体的生活习性有关。 7、青蛙是一次产卵的,产卵的数目为786-5,114个,这与王希成先生所报导的有些不同,这可能是因为青蛙产卵数目幅度较大的缘故。

The present paper deals with the results of hunting for new sources of five medi- cinal alkaloids. Reserpine:A study by means of paper chromatography and UV spectra indicat- ed that reserpine was present in all five species and three varieties of Chinese Rau- volfia,viz.R.serpentina,R.yunnanensis,R.latifrons,R.tiaolushanensis,R.verticil- lata,R.verticillata var.rubrocarpa,R.verticillata var.hainanensis,R.verticillata var. oblanceolata,the total alkaloid and the reserpine percentage of these plants are given...

The present paper deals with the results of hunting for new sources of five medi- cinal alkaloids. Reserpine:A study by means of paper chromatography and UV spectra indicat- ed that reserpine was present in all five species and three varieties of Chinese Rau- volfia,viz.R.serpentina,R.yunnanensis,R.latifrons,R.tiaolushanensis,R.verticil- lata,R.verticillata var.rubrocarpa,R.verticillata var.hainanensis,R.verticillata var. oblanceolata,the total alkaloid and the reserpine percentage of these plants are given in table 1. Atropine:Tested by the method of TLC of the Chinese solanaceous plants,hy- oscyamine has been shown to be present in Atropanthe sinensis,Mandrogora caules- cens,Hyoscyamus pusillus,Physochlaina infundibularis,Physochlaina physoides,Prze- walskia shebbearei,Przewalskia tangutica,Scopolia lurida,Scopolia tangutica.Further- more,the major alkaloid isolated from the roots of Przewalskia shebbearei was iden- tified as hyoscyamine based upon melting point,UV and IR spectra,the total alkaloid and hyoscyamine content was 1.89% and 1.65% respectively.Owing to the presence of tropane group alkaloids in the genus Przewalskia,it thus reveals the ubiquitous existence of these alkaloids in the whole genera of the Solanaceae-Solaneae-Hyoscya- minae(sensu Wettstein),which may be regarded as a high incidence of tropane-con- taining category. Strychnine:By means of an alkaloid screening method,three species of Strychnos appear to have a high alkaloid content,viz.S.pierriana,S.confertiflora and S.hainan- ensis.Strychnine is the princeple alkaloid identified in the seeds of S.pierriana and in the roots of S.confertiflora,while the seeds of S.hainanensis contains chiefly brucine.The total alkaloid content was 1.26% and 2.9% with strychnine content of 1.1% and 0.04% for the 2nd and 3rd plant respectively. Ephedrine:A study has been made on the total alkaloid content as well as ephe- drine and pseudo-ephedrine percentages of genus Ephedra,obtained from autonomous regions Sinkiang and Tibet,the results are recorded in table 2. Berberine:The amount of berberine in Tibetan Berberis has also been determined. Berberis jamesiana Forrest et W.W.Sm.has been found to contain a high content of this alkaloid(7.07%—7.73%). Finally,the present work reveals that the Plant Phylogeny-Phytochemistry rela- tionships can be satisfactorily used in the discovery of new sources of drugs.

本文报道了五种重要的药用生物碱资源植物的研究结果对于萝芙木总碱和利血平资源植物,分析了国产萝芙木属(Rauvolfia)五个种及三个变种根中总生物碱及利血平的含量;对于阿托品资源植物,重点研究了国产的茄科植物,发现有六个属九个种植物含有莨菪碱,并证明矮莨菪(Przewalskia shebbearei)根中的总生物碱高达1.89%,莨菪碱含量为1.65%;对于士的宁资源植物,研究了八种国产的马钱属(Strychnos)植物,有三种含生物碱量较高;对于麻黄碱资源植物,重点分析了产于西藏与新疆的麻黄属(Ephedra)的三个种及一变种;对于小檗碱资源植物,分析了采自西藏的四种小檗属(Berberis)植物,其中大刺黄柏小檗内皮的含量以小檗碱计算可达7.73%。本研究证明了利用植物亲缘关系相近,则其化学成分也近似的规律来寻找并扩大药物资源,是一种有效的途径。当某种天然生物碱通过大量的研究和临床验证,肯定其疗效,并确定其法定地位(收载入药典),投入生产时,对于这种药物资源的需求,就成为一个突出的问题。目前,除了根据其化学结构采用人工合成方法外,最常用的解决途径便是利用植物亲缘关系和化学成分间存在着密切联系这一规律,从...

本文报道了五种重要的药用生物碱资源植物的研究结果对于萝芙木总碱和利血平资源植物,分析了国产萝芙木属(Rauvolfia)五个种及三个变种根中总生物碱及利血平的含量;对于阿托品资源植物,重点研究了国产的茄科植物,发现有六个属九个种植物含有莨菪碱,并证明矮莨菪(Przewalskia shebbearei)根中的总生物碱高达1.89%,莨菪碱含量为1.65%;对于士的宁资源植物,研究了八种国产的马钱属(Strychnos)植物,有三种含生物碱量较高;对于麻黄碱资源植物,重点分析了产于西藏与新疆的麻黄属(Ephedra)的三个种及一变种;对于小檗碱资源植物,分析了采自西藏的四种小檗属(Berberis)植物,其中大刺黄柏小檗内皮的含量以小檗碱计算可达7.73%。本研究证明了利用植物亲缘关系相近,则其化学成分也近似的规律来寻找并扩大药物资源,是一种有效的途径。当某种天然生物碱通过大量的研究和临床验证,肯定其疗效,并确定其法定地位(收载入药典),投入生产时,对于这种药物资源的需求,就成为一个突出的问题。目前,除了根据其化学结构采用人工合成方法外,最常用的解决途径便是利用植物亲缘关系和化学成分间存在着密切联系这一规律,从已知含此类成分的植物类群中去寻找高含量的新资源。实践证明,这是一条行之有效的途径。以下便是我们对五种重要药用生物碱资源植物的部分研究报道。

Tin's paper deals with the effects of some dietary physico-chemical factors on the feeding and growth of the silkworm. Some dietary requirements for the growth of the larvae have been studied and clarified. The results are as follows.1.Our experiments showed that chlorogenic acid, morin arid inositol promoted the feeding activity of the newly hatched larvae. β-Sitosterol and gallic acid were important for the normal growth of early instar larvae and chlorogenie acid, morin and inostiol also showed some favourable...

Tin's paper deals with the effects of some dietary physico-chemical factors on the feeding and growth of the silkworm. Some dietary requirements for the growth of the larvae have been studied and clarified. The results are as follows.1.Our experiments showed that chlorogenic acid, morin arid inositol promoted the feeding activity of the newly hatched larvae. β-Sitosterol and gallic acid were important for the normal growth of early instar larvae and chlorogenie acid, morin and inostiol also showed some favourable effects on that stage. In contrast, the above mentioned chemicals had very slight influence on the fifth instar larvae. In our experiments we did not find the feeding promotive effect of β-sitosterol on the newly hatched larvae.2.There were feeding repellent factors in the ether extracts of the soya-bean cake powder, and a water soluble factor may be removed by treatment with 90% me-thanol. The methanol treated powder favoured the growth of the early instar larvae. The feeding repellent effect of the untreated cake powder was less conspicuous on the later instar larvae. Better results on larva rearing were obtained when sorbie acid was used as the antiseptic agent in the artificial diet in comparison with that when propionic acid was used.3.The optimal water contents in the artificial diets for the newly hatched larvae, early instar larvae and later instar larvae were 77%, 73% and 71% respectively. Our experiments also showed that the results of larva rearing were influenced by the gel forming agents which contributed much to the physical character of the diets.4.Suitable regulation of the dietary acidity to pH 5 with citric acid and ascorbic acid favoured both the larval feeding activity and the rearing results.5.Based on the facts that the responses to the feeding promotive and repellent factors in the diets were different in different larval instars, it seems necessary to design different artificial diets for the larvae of different developmental stages: the newly hatched larvae, first to fourth instar larvae and the fifth instar larvae. There was also a difference in the different varieties of the silkworm to adapt the artificial diets which demonstrated the difference in their requirements for the physico-chemical factors in the diets.

本文研究了人工饲料某些理化因素对蚕儿摄食和生长的影响,从而阐明家蚕生长发育过程中在摄食行为和营养上的特点和变化。 1.试验表明:绿原酸、桑色素、肌醇可增进蚁蚕摄食:β-谷固醇、没食子酸对保证小蚕正常发育甚为重要,绿原酸、桑色素、肌醇也有良好影响;相比之下,上述一些因子对5龄大蚕的作用较小。此外未看到β-谷固醇对蚁蚕的摄食促进效果。 2.大豆粉的醚溶性成份中,含有影响蚁蚕摄食的忌避物质。大豆粉经90%甲醇处理,可以除去某种水溶性因子,有利小蚕生长;对比之下,上列因素对大蚕的损害较小。比较了二种常见防腐剂对家蚕摄食、成长的影响:山梨酸的饲蚕成绩优于丙酸。 3.在本试验基本组成条件下,收蚁、小蚕、大蚕所用饲料的含水率分别以77%、73%、71%左右为宜。实验说明,蚕儿饲育效果还受饲料中具有成形作用组份的影响。 4.调查了饲料pH和蚕儿摄食、成长的关系:以某些适宜的有机酸(如柠檬酸、抗坏血酸)调节饲料的pH在5左右为好。 5.由于不同发育阶段的蚕儿对摄食、成长促进因子的感受性和对忌避因素的耐受性均不相同,从而提出,对蚕儿作全龄饲育,至少应分别设计为收蚁用、1—4龄小蚕用、5龄大蚕用三种饲料。此外,不同品种家蚕对人工饲...

本文研究了人工饲料某些理化因素对蚕儿摄食和生长的影响,从而阐明家蚕生长发育过程中在摄食行为和营养上的特点和变化。 1.试验表明:绿原酸、桑色素、肌醇可增进蚁蚕摄食:β-谷固醇、没食子酸对保证小蚕正常发育甚为重要,绿原酸、桑色素、肌醇也有良好影响;相比之下,上述一些因子对5龄大蚕的作用较小。此外未看到β-谷固醇对蚁蚕的摄食促进效果。 2.大豆粉的醚溶性成份中,含有影响蚁蚕摄食的忌避物质。大豆粉经90%甲醇处理,可以除去某种水溶性因子,有利小蚕生长;对比之下,上列因素对大蚕的损害较小。比较了二种常见防腐剂对家蚕摄食、成长的影响:山梨酸的饲蚕成绩优于丙酸。 3.在本试验基本组成条件下,收蚁、小蚕、大蚕所用饲料的含水率分别以77%、73%、71%左右为宜。实验说明,蚕儿饲育效果还受饲料中具有成形作用组份的影响。 4.调查了饲料pH和蚕儿摄食、成长的关系:以某些适宜的有机酸(如柠檬酸、抗坏血酸)调节饲料的pH在5左右为好。 5.由于不同发育阶段的蚕儿对摄食、成长促进因子的感受性和对忌避因素的耐受性均不相同,从而提出,对蚕儿作全龄饲育,至少应分别设计为收蚁用、1—4龄小蚕用、5龄大蚕用三种饲料。此外,不同品种家蚕对人工饲料适应性的差别,与对饲料理化条件需求的不同也有一定联系?

 
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