Development of a miniature silicon wafer fuel cell using L-ascorbic acid as fuel

In the current studies a miniature silicon wafer fuel cell （FC） using L-ascorbic acid as fuel was developed. The cell employs L-ascorbic acid and air as reactants and a thin polymer electrolyte as a separator. Inductively coupled plasma （ICP） silicon etching was employed to fabricate high aspect-ratio columns on the silicon substrate to increase the surface area. A thin platinum layer deposited directly on the silicon surface by the sputtering was used as the catalyst layer for L-ascorbic acid electro-oxidation. Cyclic voltammetry shows that the oxidation of L-ascorbic acid on the sputtered platinum layer is irreversible and that the onset potentials for the oxidation of L-ascorbic acid are from 0.27 V to 0.35 V versus an Ag/AgCl reference electrode. It is found that at the room temperature, with 1 mol/L L-ascorbic acid/PBS （phosphate buffered solution） solution pumped to the anode at 1 ml/min flow rate and air spontaneously diffusing to the cathode as the oxidant, the maximum output power density of the cell was 1.95 mW/cm^2 at a current density of 10 mA/cm^2.     

Batch and fed-batch production of butyric acid by Clostridium butyricum ZJUCB

INTRODUCTION Butyric acid has several potential applications in industry. Its applications in the foodstuffs and beverage industries are widespread. It may be used as the pure acid in the dairy industry, or in the form of esters as a food additive to increase fruit fragrance. Furthermore, butyric acid could also have some important physiological functions. For example, butyric acid esters are the character-impact flavors in tropic fruits and dairy products (Centeno et al., 2002; Watson e…     

海气相互作用下厄尔尼诺与我国降水相关性分析

厄尔尼诺现象是当今国际社会普遍关注的热点.在参阅国内外科学研究成果的基础上,基于海气相互作用对厄尔尼诺成因机制进行了探讨,如沃克环流与信风作用、东亚大槽活动、夏季热带大气环流异常,并结合多年海气统计资料进行相关性分析,探讨厄尔尼诺与我国降水的耦合关系,最后基于现代技术对未来的海气观测做了美好展望.     

大黄酸分子印迹聚合物的制备及其特性

以甲基丙烯酸(MAA)为功能单体,以大黄酸为模板分子,通过沉淀聚合法制备了具有与大黄酸分子结构相匹配的分子印迹聚合物(MIPs),利用扫描电镜和红外光谱对其结构进行了表征,并考察了MIPs的吸附性能.     

微生物发酵生产十二碳二元酸的研究

热带假丝酵母（Candida tropicalis）是长碳链二元酸发酵生产中的常用菌种,而热带假丝酵母突变株HP-2-48是一株高产DC12的优良生产菌株。本文对十二碳二元酸的发酵进行了研究,考察了青霉素钠盐、尿素、丙烯酸、pH值对菌体生长、产酸的影响并对其作用机制进行了讨论,并据此建立了长碳链二元酸新的发酵工艺。     

SYNTHESIS AND STRUCTURE OF A MIXED-LIGANDS COMPLEX [CU(R-LACT)(O-PHEN)(H_2O)]·4H_2O

A mixed-ligands complex with the formula of [Cu(R-lact)(o-phen)(H2O)]·4H2O was synthesized by the reaction of copper carbonate with racemic lactic acid(RS-H2lact), and then with o-phenanthroline(o-phen) in ethanol-water(95%) solution. One of the two obtained compounds was dark blue column single crystal and was characterized by elemental analysis, IR spectrum and X-ray single crystal diffraction. The crystal belongs to triclinic system with space group P1, a=7.2825(5), b=11.7322(8), c=12.1194(8), α=65.8280(10)°, β=84.2120(10)°,γ=75.3290(10)°, V=913.88(11)3, Z=2, Dc=1533kg·m-3, Mr=421.89, μ(Mo K\α)=1.240mm-1,λ =0.71073, the final R =0.0483 and ωR =0.1199 [I2σ(I)] for 3120 observed reflections,F(000)=438. The copper atom is five coordinated with the distorted square pyramid environment.The five coordinated atoms are two oxygen atoms of depronated hydroxyl group and carboxyl of H2 lact, two nitrogen atom of o-phen and one oxygen atom of water molecule.     

短跑道速度滑冰运动员坡路训练方法

目的:探究坡路训练方法对短跑道速度滑冰运动员速度与速度耐力素质的影响;方法:采用坡路(坡度15°左右)进行快速屈膝走,利用血乳酸作为强度监控指标进行无氧耐力速度训练;结果:坡路训练方法,坡度15°~20°为宜,长度150~200m为完成有效负荷的距离,血乳酸达到10mmol/L为有效强度;结论:坡路训练是改善短道速滑运动员骨胳肌代谢水平,提高其乳酸生成能力与发展快速蹬冰力量的有效手段。     

催化合成衣康酸二甲酯

用自制的钼镍催化剂，经衣康酸和甲醇反应合成了衣康酸二甲酯。合成衣康酸二甲酯的最佳条件为：n(衣康酸)：n(甲醇)=1：6；催化剂用量为总反应的3％；反应温度120℃；反应时间6h；酯收率为85％。产品通过FT-IR鉴定，谱图与标准谱图一致，气相色谱及化学分析表明，该合成酯的质量分数达98％。     

补充肌酸对安静时机体代谢底物利用的影响

通过测量呼吸商,研究了补充肌酸对于安静时机体底物利用的影响.10名男子,进行12周的力量训练,分两个阶段进行肌酸补充.在第12周以后测量体重、呼吸商和力量大小.在实验组和对照组,股四头肌力量显著增加,体重在补肌酸组增加,但在对照组没有增加;在补充肌酸组,呼吸商增大,表明糖在供能底物中的氧化率增加.