In this thesis, in order to reducing the amount of the pt catalyst, improving the electrocatalytic activity of the pt catalysts and utilization ratio of pt, the electrochemical codeposition method by cyclic voltammetry ( cv ) was used to prepare a series pt / moox / glassy carbon ( gc ) composite electrodes with high dispersibility. the composite electrode, pt / moox / gc, was characterized to study its composition and its electro chemical behavior by cv. using the xrd and sem techniques, the size and the dispersion degree of the catalyst particles were studied in presence or absence of moox in the catalyst
為了降低主催化劑pt的用量、提高pt的活性和利用率,本論文利用
循環伏安法共沉積制備高分散的pt moo _ x催化劑顆粒,利用
循環伏安電化學表徵、 xrd和sem技術研究了引入moo _ x后的催化劑即pt moo _ x顆粒的粒子大小、分散狀態;利用icp - aes定量分析pt moo _ x催化劑顆粒的組成含量;並藉助于電化學方法分別評價了pt moo _ x gc電極催化劑的對甲醇的電催化活性和穩定性、
氧還原電催化活性。
Magical fire ( eye doctor ) looks at well - being cream of sticking drawing tradition traditional chinese medicine formula famous and precious in tsinghua, is tied in wedlock modern up - to - date medicine result of scientific research, the various chinese medicinal crop famous and precious being carefully chosen, adopt the modern nano - technology and target to poison a technology to being given to, let various active material, tiny molecule, nutrition factor glutathione etc. guide medicine it is all right for to go ahead, the brute force passes through blood eye parclose, make pesticide effect reach nidus directly location, prompt the nutrition replenishing an eye with the part ( include ciliary muscle, retina, crystalline lens, optic nerve ), active eye part cell, improve eye part immunocompetence and oxidation resistance, boost an eye part organizing an assimilation of the new and excretion of the old, microcirculation improving and restoring an eye part, thereby reach eliminate look at strain, purpose improving and improving sight
清華神火視康貼汲取傳統中藥名貴配方之精華,結合現代醫藥最新科研成果,精選多種名貴中藥材,採用現代納米技術和靶向給藥技術,讓多種活性物質、微分子、營養因子谷胱甘肽等引藥上行,強力穿透血眼屏障,使藥效直達病灶部位,迅速補充眼部(包括睫狀肌、視網膜、晶狀體、視神經)的營養,激活眼部細胞,提高眼部免疫能力和抗
氧化能力,促進眼部組織新陳代謝,改善和恢復眼部微
循環,從而達到消除視疲勞,改善和提高視力的目的。
In the work, it was systemically studied that the effects of two suggested modifying ways on electrochemical characteristics of lithium metal electrode and its behaviors in lithium cell. finally, the action mechanisms of these two modifying ways were analyzed. through the study on pretreatment effects of different cyclic ether on lithium electrode, it was found that 1, 4 - dioxane ( doa ) and 1, 3 - dioxolane ( dol ), both could form a favorable passivating sei film on lithium electrode surface through
研究不同環醚對鋰電極的預處理作用發現, 1 , 4 -二
氧六環( doa )和1 , 3 -二
氧五環( dol )對金屬鋰電極的表面預處理均可以在金屬鋰表面形成一層良好的sei鈍化膜,對鋰金屬電極起到了保護性作用,使鋰電極具有較小的界面阻抗,有效地提高了金屬鋰電極的充放電
循環效率,改善了鋰金屬電極在
循環過程中的表面形貌;而doa和dol對金屬鋰電極的表面預處理,不會明顯的影響鋰電極的動力學性能。
Linio2 - based compounds were promising candidates of cathode materials for lithium ion batteries. but they still possessed various problems such as the difficulty of preparation, the poor heat stability and the dissatisfactory cycleability performance and so on, which insolubility for its practical applications, so it must be optimized synthesis and changed perfomance
鋰鎳
氧系列電極材料是當前鋰離子電池新一代正極材料的研究熱點之一,但是由於該系列材料存在著諸如制備困難、熱穩定性差、
循環性能差等問題而不能實際應用,必須對其進行合成優化和性能改性。
The experimental result shows ozone has the function of killing bacteria, preventing scale and alleviating corrosion in the system of evaporation cooling air conditioning
結合實驗結果,驗證了臭
氧在蒸發冷卻
循環水處理中的殺菌、阻垢及防腐作用。
In this paper, a multi - area diagnostic & predictive model are proposed for combustion process in gasoline engines. models are composed of thermodynamic model, turbulence flams propagation model & nitrogen oxides ( nox ) formation model
本文建立了汽油機燃燒過程的多區診斷及預測模型,其中包括氮
氧化物生成模型和廢氣再
循環降低氮
氧化物生成的優化模型。
Sticking sluggish blood disease high is the pathology that is main show with haemal viscosity heighten is asked for integratedly, blood stream obstruction is increased, flow is decelerated, affect to small artery and blood capillary and small loop especially apparent, cause quantity of constituent blood perfusion to decrease, generation is short of blood anoxic symptom
高粘滯血癥是以血液粘度增高為主要表現的病理綜合征,血流阻力加大,流動減慢,尤其對小動脈和毛細血管及微
循環影響明顯,致使組織血液灌注量減少,產生缺血缺
氧的癥狀。
Specifically for the iron and steel industry during the past 15 years, thermo electron has installed over 100 mass spectrometers for gas analysis applications involving the following plants : coke ovens, blast furnace ( bf ), direct reduction iron ( dri ), basic oxygen furnace ( bof ), electric arc furnace ( eaf ), argon oxygen decarburization ( aod ) furnace, vacuum oxygen decarburization vod furnace and ruhrstahl - hausen ( rh ) furnace
尤其在過去15年的鋼鐵行業中,超過100臺過程質譜儀用於氣體分析,包含:焦爐,高爐,直接還原煉鐵爐,
氧氣頂吹轉爐,電弧爐,氬
氧脫碳轉爐,真空
氧氣脫碳爐和
循環法真空脫碳爐。
Atracheotomy is an emergent method in the treatment of the respiratory tract obstructionand in the improvement of oxygen circulation. it has been extensively applied in clinicalmedicine. subcutaneous emphysema and infection of the incisional wound are commoncomplications after tracheotomy. the causes for the complications are analysed and theincisional dressing change method after tracheotomy is improved to redue the incidence ofsubcutaneous emphysema and infection of noisional wound effectively
氣管切開術,做為臨床解除呼吸道梗阻,改善氧循環的一種急救技術,已被廣泛採用,但氣管切開術后發生的皮下氣腫及切口周圍感染是臨床常見並發癥,本文針對其發生原因進行了分析,探討了改進術后切口的換藥方式,有效的降低了皮下氣腫和感染的發生率。