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ph values
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  ph值
     Mitotic Division of Microspores in Wheat in Phosphate Buffers with Varied pH Values and lonic Strengths
     在不同pH值和离子强度的磷酸缓冲液中的小麦小孢子有丝分裂
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     The Establishment of Generalized Acidity Equation and Calculation of PH Values of Acid Solutions
     统一酸度方程式的建立与PH值的计算求解
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     PH Values, Diurnal Cycle of Gastric Acid and Its Role in Digestion of Blue-green Alga, Microcystis flos-aquae in Nile Tilapia, Oreochromis niloticus (Linn)
     尼罗罗非鱼(Oreochromis niloticus Linn)胃酸的PH值,周日变化及其在消化兰藻中的作用
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     Effect of pH Values on Resonance Raman Spectra of Brilliant Yellow in Aqueous and CTAB Micella Solutions
     pH值对亮黄水溶液及CTAB胶束溶液共振Raman光谱的影响
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     Biological effect of pH values on 5 species of common leeches
     五种水蛭对不同pH值的生物效应
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     ESTLMATION OF THE pH VALUES OF ACIDIC SURFACE WATERS BY CHEMICAL EQUILIBRIUM CALCULATION
     ESTLMATION OF THE pH VALUES OF ACIDIC SURFACE WATERS BY CHEMICAL EQUILIBRIUM CALCULATION
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     At 37 ℃,the sensitive pH values of P(DMAEMA) and P(DMAEMA/EHA) (D?D/E1?D/E2?D/E3) were 8.80,8.72,8.37,8.29 respectively.
     37℃下均聚物及共聚物试样 (D、D/E1、D/E2、D/E3)的pH敏感点分别为8 80 ,8 72 ,8 37,8 2 9。
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     The CODCr and BOD5 in the raw wastewater is 10000 ~ 25000 mg/L and 5000 ~ 15000mg/L respectively and its pH values at 4 ~ 5. After treatment through anaerobic high temperature digestive process, CODCr and BOD5 can be removed over 85% and 90% respectively and pH is 6 - 9, which is good for the following treatment.
     用厌氧高温消化法处理柠檬酸废水,原废水的COD_(cr)10000~25000mg/L,BOD_5000~15000mg/L,pH4~5左右,经治理后,COD_(cr)去除率大于85%,BOD_5去除率大于90%,pH6~9,为废水后续处理达标奠定了良好的基础.
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     The pH values of the vaginal secretion samples from the non-menopausal healthy: women and patients as well as from the menopausal healthy women and patients were 4.5±0.2,5.5±0.8,6.5±0.3 and 6.5±1.0,respectively.
     未绝经正常妇女和患者及绝经正常妇女和患者阴道分泌物pH分别为4.5±0.2、5.5±0.8、6.5±0.3和6.5±1.0。
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     20 groups were carried out with a cross-mix of reaction time (3, 5, 10 min), reaction temperature (24℃and 37℃)and pH values (5.7, 6.5, 7.0, 7.5, and 8.0).
     在3min、5min、10min的反应时间、24℃和37℃的反应温度以及pH5.7、6.5、7.0、7.5、8.0的条件下进行组合,并分为20个实验组,每组进行4次实验。
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     , and Ph.
     ,Ph.
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     , Ph.
     、紫竹Ph.
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     (7)pH values, (8)N-N(?)
     (7)pH值; (8)氨态氦和硝态氮;
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     And the values of Q.
     Fe~(3+)M_1位的Q.
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     THE INFLUENCE OF PH VALUES AND TEMPERATURE ON DENITRIFICATION
     pH值、温度对反硝化的影响
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  ph values
Effect of dipping solution pH values on electrostatic layer-by-layer self-assembly of side-chain azo polyelectrolyte
      
FTIR studies indicate that the azo polyelectrolyte exhibits a different ionization degree in solutions with different pH values.
      
The higher absorbance and the larger thickness of the layer-by-layer films can be attributed to the low ionization degree and the shrinkage conformation of PEAPE in the solution with low pH values.
      
The soil pH values were 5.80 and 5.85 in gap and under canopy, respectively, and were not significantly different.
      
The acetic acid treatment reduces pH values of straw fibers and has a significant effect on the internal bonding strength of straw fiberboards.
      
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A.The Soils Since the goological formation of this mountainous area is quite uniform,a vertical distribution of soils is obviously observed. At the top of the mountain with an elevation of 8,500 feet,the podzolic soil is found. The process of podzolization is clearly shown by the translocation of clays,organic matter, and active aluminum from an upper to lower layer.The gray brown podzolic soil is distributed in areas ranging from 7,000 to 8,500 feet in elevation.It is developed under forest and has a...

A.The Soils Since the goological formation of this mountainous area is quite uniform,a vertical distribution of soils is obviously observed. At the top of the mountain with an elevation of 8,500 feet,the podzolic soil is found. The process of podzolization is clearly shown by the translocation of clays,organic matter, and active aluminum from an upper to lower layer.The gray brown podzolic soil is distributed in areas ranging from 7,000 to 8,500 feet in elevation.It is developed under forest and has a surface covering of leaf litter and a surface soil with high content of organic matter.In places at an elevatin from 3,900 to 7,000 feet the yellow podzolic soil is dominant.At an elevation below 3,000 foot the red podzolic soil and the sketetal soil are fonnd. The analytical data of the soils of this area may be summarized as follows: 1.pH values of the soils:In the whole area,since the parent rock (gneiss) is poor in basic constituents,soils are all acid in reaction.The pH of the different horizons of the soils ranges from 4.0 to 5.5.The A_0 and A_1 horizons are usually less acid than B horizon,the A and B horizons are much more acid than the parent rock.This shows the leaching process of the soils under such a humid atmosphere. 2.Organic Matter of the soils:The organic matter content of the soils in this area is greatlg influenced by the kind of the vegetation cover.At an elevation of 8,500 feet, the soil developed under forest has 38.92% of organic matter in the A_1,while that under grass has only 11.08% of organic matter in the corresponding horizon.However as the vegetation cover is constant,the dopth of the A_1 and its organic matter content are evidently affected by the elevation.At an elevation of 3,000 feet,the A_1 horizon of the red podzolic soil is only 1 cm.in depth,and it has 3.37% of organic matter.At an elevation of 8,500 feet,howerver,the A_1 horizon of the podzolic soil is 7 cm.in depth, and it has 11.08% of organic matter.In addition,deposition of organic matter in the B horizon is clearly found in the podzolic soil,but it has not been seen in soils found at lower elevation. 3.Active aluminum of the soils:All the soils in this area are high in active aluminum. They contain from 20 to 16 p.p.m.of active aluminum.The content of active aluminum in the different horizons of the same profile has a very close relationship with the pH values of the corresponding horizon.The less acid the reaction the smaller is the amount of acitve aluminum.The active aluminum of the soil is usually higher in amount than that of the parent rock from which the soil is derived. 4.Available calcium magnesium,and potassium of the soils:All the soils are general- ly low in available calcium,magnesium,and potassium.The comparatively high content of these elements in the A horizon is derived from the leaves of the vegetation which are grown on that soil. 5.Available phosphorus of the soils:All the soils of this area are low in available phosphorus. 6.Available nitrate:All soils in this area are very low in nitrate. B.The Vegetation 1.The plants growing on soils of this area are most calcifuge species which are acid- loving (Vaughan and Wishe,1937).As far as the chemical analysis of the soil is concer- ned,those species may be assumed as not only acid-loving,buy also active aluminum- loving (Hutchinson,1943). 2.The distribution of the calcifuge plants In this area is apparently affected by the local climate in terms of elevation.Some of them (temperate plants) are confined to high elevation,others(tropical plants) being limited to low elevation,Two groups of the plants may be given as follows.Many of them are of the same species as those found in southwestern China (Hou,1944). (a) Plants mainly ocurring in areas at elevations from 7,000 to 8,500 foot (temperate plants): Pteridophyta: Destaedtia Scabra (Wall.) Moore Diranopteris linearis Under. Hicrioptris glauea Under. Hymenophyllum crispatum Wall. Hymenophyllum exsertum Wall. Lidsaya cultrata Sw. Lycopodium clavatum L. Plagiogyria pyphylla (Kunze) Mett. Pteridium aquilinum Wightianum Trym Pteris aspericaulis Wall. Flowering Plants: Castanopsis tribuloides A.DC. Lindera pulcherrima Bth. Osbeckia crinata Bth. Rhododendron arboreum Sm. Rhododendron grande Wight Pieris formosana D.Don Vaccinium refersceda HK. Vaccinium serrasum Wight (b) Plants mainly ocurring in areas at elevation from 1,000 to 3,000 feet (tropical plants): Pteridophyta: Adiantum philippense L. Blechnum orientale L. Aglaoorpha coronaus Copel Lycopodium cernum L. Nephrolepsis cordifolia Presl Tectaria spp. Polypodium ucidum Roxb. Flowering plants: Oxyspora paniculate DC. Themeda arundinacea Ridl.

1945年10月中旬,作者留印三月另一周,曾作三次野外调查,计包括印缅边区、恒河平原及喜马拉雅山东南麓等三区,茲先将大吉岭区调查结果,草成此文。调查区域大吉岭位于喜马拉雅山东南麓,在我国西藏边境,全区是山地,海拔自1000到9000尺不等,主为酸性的片麻岩地层,在拔海6500尺地点,年平均气温为56.3℉.,年雨量为122寸。土壤灰壤——灰棕壤组合:在拔海8500尺左右的山顶,灰壤见于草地上,而灰棕壤则发育在森林之下。灰棕壤——灰化黄壤组合:在拔海7000—8000尺地带,森林下仍是灰棕壤,而草地上则为灰化黄壤。灰化黄壤——粗骨土组合:在拔海1000—3000尺地带,片麻岩生成灰化红壤,酸性砂岩生成砾质土。全区土壤特征可归纳如下: (1)土壤 pH 值:全区因土壤母质为酸性片麻岩,各类土壤剖面亦为酸性反应;pH 值约自4.0至5.5。A_1层之 pH 值恒较 B 层为大,而土壤剖面内之 A 层及 B 层均较母岩之酸度为高。 (2)土壤有机质:从土壤有机质分析结果观之,显示植物种类对于土壤有机质之含量高低,有密切的关系,在拔海8500尺之地带,发育于森林下的灰棕壤,表土含有机质38.92%,而同处草类和蕨类植物...

1945年10月中旬,作者留印三月另一周,曾作三次野外调查,计包括印缅边区、恒河平原及喜马拉雅山东南麓等三区,茲先将大吉岭区调查结果,草成此文。调查区域大吉岭位于喜马拉雅山东南麓,在我国西藏边境,全区是山地,海拔自1000到9000尺不等,主为酸性的片麻岩地层,在拔海6500尺地点,年平均气温为56.3℉.,年雨量为122寸。土壤灰壤——灰棕壤组合:在拔海8500尺左右的山顶,灰壤见于草地上,而灰棕壤则发育在森林之下。灰棕壤——灰化黄壤组合:在拔海7000—8000尺地带,森林下仍是灰棕壤,而草地上则为灰化黄壤。灰化黄壤——粗骨土组合:在拔海1000—3000尺地带,片麻岩生成灰化红壤,酸性砂岩生成砾质土。全区土壤特征可归纳如下: (1)土壤 pH 值:全区因土壤母质为酸性片麻岩,各类土壤剖面亦为酸性反应;pH 值约自4.0至5.5。A_1层之 pH 值恒较 B 层为大,而土壤剖面内之 A 层及 B 层均较母岩之酸度为高。 (2)土壤有机质:从土壤有机质分析结果观之,显示植物种类对于土壤有机质之含量高低,有密切的关系,在拔海8500尺之地带,发育于森林下的灰棕壤,表土含有机质38.92%,而同处草类和蕨类植物发育下的灰壤的表土,仅含有机质11.08%,但在相同的植物环境下,拔海高度或局部气候,也是支配土壤有机质含量的重要因素,例如在拔海3000尺地带,长有草类的灰化红壤,仅有极薄之有机质层,该层有机质含量为3.37%,而在拔海8500尺地带,长有草类的灰壤,则有较厚层有机质,其含量为11.08%。 (3)可溶性铝质:全区土壤含有高量可溶性铝,大约自20至160 p.p.m.,其含量与 pH 值高低相关,土壤 pH 值愈酸,可溶性铝含量就愈高。 (4)可溶性钙镁及钾质:全区土壤之可溶性钙,镁及钾等之含量均较低,但就同一土壤剖面而言,富于有机质的 A。或 A_1层的钙镁和钾质,常较 B 层为高,此点显示此等成份是来自植物遗体,亦即指示土壤中有机质与肥力之关系。 (5)全区土壤有效磷含量均甚低。 (6)全区土壤硝酸态氮之含量均极低,并有下淋现象。植物本文所论植物,仅以作者所采集而经各专家鉴定为限,其中以蕨类植物为主。本区的土壤都是酸性反应,所见的植物是以嫌钙性者为主,这些嫌钙性植物与拔海高度的关系很显著,兹将常见的植物种类,叙述如下: (一)主分布于拔海7000—8500尺地带的植物: 蕨类植物 Dennstaedtia scabra(Wall.)Moore Dicranopteris linearis Under. Hicriopteris glauca Under. Hymenophyllum crispatum Wall. Hymenophyllum exsertum Wall. Lindsaya cultrata Sw. Lycopodium clavatum L. Plagiogyria pycniphylla(Kunze)Mett. Pteridium aquilinum Wightianum Trym. Pteris aspericaulis Wall.种子植物 Castanopsis tribuloides A.DC. Lindera pulcherrima Bth. Osbeckia crinata Bth. Rhododendron arboreum Sm. Rhododendron grande Wight Pieris formosana D.Don Vaccinium referesceda HK. Vaccinium Serrasm Wight(二)主分布于1000—3000尺地带的植物: 蕨类植物Adiantum philippense L.Blechnum orientale L.Aglaomorpha coron(?)us copelLycopodium cernuum L.Nephrolepsis cordifolia PresslTectaria spp.Polypodium lucidum Roxb.种子植物Oxysoira paniculata DC.Themedra arundinacea Ridl.

When alkali soil is leached with water,the amount of calcium in waterextracts is always less than in the case of normal soil.With increaseddilution there is a definite increase in the amount of calcium given out,yet the quantity is not very great.When water is added in increasingamounts to the normal soil,there is no increase in pH values of the suc-cessive filtrates and the pH of the distilled water is easily obtained,whilstthe pH value of the alkali soils falls very gradually to a pH...

When alkali soil is leached with water,the amount of calcium in waterextracts is always less than in the case of normal soil.With increaseddilution there is a definite increase in the amount of calcium given out,yet the quantity is not very great.When water is added in increasingamounts to the normal soil,there is no increase in pH values of the suc-cessive filtrates and the pH of the distilled water is easily obtained,whilstthe pH value of the alkali soils falls very gradually to a pH of 7.5.Theamount—CO_3-ions in the extracts gradually decreases with concomitant de-crease in pH values.The amount of bicarbonates at first increases gra-dually and then falls.A gradual decrease in pH values also takes placewith repeated washings with distilled water.

当用水淋洗碱土时,其水浸提液中的钙量恆少于普通土壤中者。水土比例增大时,淋洗出的钙量增多,惟增加量不很大。水土比例增大时,普通土壤各次滤液的pH 值并不增大,且易于达到蒸馏水的pH 值,反之,碱土的pH 值很慢的降低至pH 7.5。浸提液中CO_3~=量逐渐减少,和pH 值的降低相一致,重碳酸盐量开始时逐渐增多,以后又降低。反覆用水淋洗时pH 值亦逐渐降低。

In present experiment the desorption of adsorbed ammonium by soilsand clay minerals from ammonium chloride and ammonium acetate solutionsof various concentrations and at different pH values were studied in detail.The samples used include a lateritic red soil(SiO_2/R_2O_3 of clay 1.05),a redsoil(SiO_2/R_2O_3 1.63),a podsolized yellow soil(SiO_2/R_2O_3 1.59),a betoniticclay and a kaolinitic clay.Among the conclusions obtained from the experiments,the followingsare of outstanding significance. 1.The adsorbed...

In present experiment the desorption of adsorbed ammonium by soilsand clay minerals from ammonium chloride and ammonium acetate solutionsof various concentrations and at different pH values were studied in detail.The samples used include a lateritic red soil(SiO_2/R_2O_3 of clay 1.05),a redsoil(SiO_2/R_2O_3 1.63),a podsolized yellow soil(SiO_2/R_2O_3 1.59),a betoniticclay and a kaolinitic clay.Among the conclusions obtained from the experiments,the followingsare of outstanding significance. 1.The adsorbed ammonium of soils or clay minerals may be dividedinto two parts——the“easily releasible ammonium”which can be removedreadily by steam distillation,and the“un-easily releasible ammonium”which can only be replaced by distilling with a strongly alkaline solution.2.The fixation of the easily releasible ammonium by soil seems to beinduced by the molecular adsorption of sesqui-oxides,the amount of whichincreases with the increase of pH value of the medium solution,Purebetonitic and kaolinitic clays possess only very low abilty to fixed the easilyreleasible ammonium and the pH of the medium solution gives no effect tothe rate of adsorption.3.About 29-45% of the easily releasible ammonium can be removedfrom the soil by dehydration over CaCl_2 and thus seems to belong to physicaladsorption.4.In an equilibrium system the relationship between the amount ofeasily releasible ammonium and the concentration of ammonium salt solution,at concentrations lower than 0.1 N,appears to obey Freundlich's equation.5.The relationship between the amount of easily releasible ammoniumand the pH value of an ammonium saturated soil can be expressed by thefollowing equation;pH=aD+b,where“D”denotes the amount of easily releasible ammonium in m.e.per100 gms of soil,“a”is a constant which equals 0.88 under experimentalcondition for all tested soils,and“b”,the pH value of an ammonium-soilwhen the amount of easily releasible ammonium of that soil equals to zero.

1.土壤的吸收性铵可分为两部分,一部分易在蒸汽蒸馏情况迅速解吸。称之为“易解吸性铵”;另一部分则只能在强碱性条件下被蒸馏出来,称为“非解吸性铵”。2.对于红黄壤,“易解吸性铵”可能是R_2O_3引起的一种物理性吸附,其吸附量随介质的pH 值的增高而迅速增大。高岭土和斑脱土的“易解吸性铵”量很低,且与介质pH值无关。所有试样的“非解吸性铵”均与介质pH 无关。3.“易解吸性铵”中有29—45%可以在干燥器(放CaCl_2)中因脱水而损失。4.红壤的“易解吸性铵”量,与电解质浓度(低于0.1N 时)的关系,完全服从Freun-dlich 方程式。其“非解吸性铵”则与浓度无关。5.铵质土的pH 与“易解吸性铵”含量具有一定关系,它可表示为:pH=αD+b;其中D 为“易解吸性铵”的每百克土壤中毫当量数;α为常数,在本试验中对于红壤标本其值为0.88,b 相当于“易解吸性铵”数值为零时铵质土的pH 值。6.用於洗涤的酒精浓度的变化,对于斑脱土的吸收性铵的总量不起影响,但对于土壤试样,则随酒精浓度的降低而减少其吸收性铵的总量,而其减少的部分,几乎全为“易解吸性铵”。

 
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