emboss finish

The concave-convex property of a surface is one of the important and classical issues in differential geometry.

曲面的凹凸是微分幾何學中的經典問題之一,劃分出曲面上不同的凹凸區域,對于研究曲面的凹凸以及其他性質是一件很有意義的工作。

This article present the continuity,differentiability,monotonicity,concave-convex,parity and periodicity of the function netermined by the definite integral of variable upper limit and variable lower limit,establishes the sufficient and necessary requirements of functional convex and integrability of derived function by using the definite integral of variable upper limit.

給出了變上限與變下限定積分所確定函數的連續性、可微性、單調性、凹凸性、奇偶性、周期性,利用變上限定積分建立了函數凸及導函數可積的充分必要條件。

Some definitions and discriminating methods have been given on the monotonicity,extreme value,concave-convex and inflection points of the curve r=r(θ).

研究了極坐標系中曲線r =r(θ)的切線、法線、漸近線方程 ,給出了r =r(θ)的單調性、極值、凹凸、拐點的定義和判別法 ,從而解決了《數學分析》中未曾解決的極坐標方程所表示的曲線的作圖問

Remediation of attapulgite on copper contaminated soil;

凹凸棒石修復銅污染土壤

Character of attapulgite adsorbent and its application in oil bleaching;

凹凸棒石吸附劑特征及其在油脂脫色過程中的應用研究

Effect of PP-g-MAH on Mechanical Properties of PP/Attapulgite Composites;

聚丙烯接枝馬來酸酐對聚丙烯/凹凸棒石復合體系力學性能的影響

Adsorption properties of attapulgite clay and activated carbon to water-soluble dyes;

凹凸棒土與活性炭對水溶性染料的吸附研究

Bleaching of hemp seed oil with activated attapulgite clay;

活性凹凸棒土對大麻籽油脫色的研究

Study on the treatment of chromium contarining wastewater with modified attapulgite clay;

改性凹凸棒土凈化含鉻廢水的研究

Study on the Ion exchange of potassium,calcium and magnesium by alter-attapulgite;

改性凹凸棒土對鉀、鈣、鎂離子交換作用的研究

Preparation and characterization of nano TiO_2-attapulgite composites;

納米TiO_2/凹凸棒土復合體的制備及其表征

Study on the simultaneous determination of Zn(Ⅱ) in food based on pre-separation/enrichment by attapulgite with FAAS;

凹凸棒土預分離/富集與FAAS聯用分析糧食中Zn(Ⅱ)的研究

Preparation and properties of attapulgite/bentonite/sodium polyacrylate composite superabsorbent;

凹凸棒/膨潤土/聚丙烯酸鈉復合吸水樹脂的合成及其吸水速率

Separation and purification of Gansu attapulgite clay minerals;

甘肅凹凸棒礦石的分離與純化研究

Advances in attapulgite/polymer composites;

凹凸棒/聚合物復合材料研究進展