Effect on Photoluminescence Intensity of Porous Silicon Processing by a Wet Oxidized Technology

【中文文摘】在适当条件下氧化多孔硅是提高多孔硅发光强度的良好途径。首次采用含CH3CSNH2的HF酸水溶液作为氧化剂对初始多孔硅进行了湿法阳极氧化,大大改善了多孔硅的发光强度,并研究了氧化电流密度、氧化温度、氧化时间等一系列因素对氧化多孔硅光致发光强度的影响。实验发现,在电流密度1mA/cm2,氧化液温度60℃,氧化时间为10min的条件下,可以获得最强光致发光;在此最优条件下得到的氧化样品较初始样品发光增强了18倍。 【英文文摘】Oxidizing porous silicon in proper condition is a good approach to improve PS photoluminescence intensity.We for the first time using electrolyte containing CH_3CSNH_2 to oxidize initial PS,which boost up photoluminescence intensity of PS greatly.We also studied oxidizing current density,oxidizing temprature,oxidizing time etc.It is testified that the best intensity of PL can be obtained when oxidizing for 10 minutes in 60 ℃ oxidizing solution using 1 mA/cm~2 current density.In these conditions we can obtain best photolumine scence intensity which is 18 time s than that of original porous silicon

ICP-MS法对闽南常见食(药)用菌的微量元素分析测定

建立微波消解-电感耦合等离子体质谱(Inductively Coupled Plasma Mass Spectrometry,ICP-MS)测定食、药用菌微量元素的方法,并对闽南地区常见的6种食、药用菌的6种微量元素锌(Zn),铜(Cu),铅(Pb),砷(As),汞(Hg)和镉(Cd)进行了分析。结果表明,所建立的方法简便、快速、准确。在所测得的6种食、药用菌中,不同的微量元素含量差别较大,其中Zn含量以巴西蘑菇最高(72.35μg/g),银耳最低(26.40μg/g),Cu含量以巴西蘑菇最高(47.77μg/g),黑木耳最低(8.67μg/g),Pb、As含量则分别在0～6.43μg/g和0.13～0.85μg/g之间变动,而Hg的最高含量为4.69μg/g,Cd的最高含量为0.50μg/g,这些结果可为人们日常生活中的膳食及药用提供一定的参考依据。国家自然科学基金资助(NO.30572316

Identification and immunogenicity analysis of artificial antigen of Glycyrrhizic acid conjugated with BSA

目的制备中药甘草的活性成分甘草酸(GA)的人工抗原及抗血清,为制备GA的单克隆抗体、并建立快速检测GA的酶联免疫吸附测定(ELISA)提供技术基础。方法将GA与载体蛋白牛血清白蛋白(BSA)偶联起来制得完全抗原后,经基质辅助激光解吸飞行时间质谱鉴定其相对分子质量,用此抗原免疫BALB/c小鼠,制备抗血清,并通过间接ELISA法和竞争ELISA法检测其抗体效价和特异性。结果合成的人工抗原GA-BSA中GA与BSA的结合比约为7∶1;免疫小鼠得到特异针对GA的多抗血清,GA抗体的效价为1∶8000。结论成功地合成了GA的人工抗原,且该抗原有较好的免疫原性,可应用于建立GA的免疫分析方法。Purpose To prepare the conjugate antigen Glycyrrhizic acid-bovine serum albumin(GA-BSA) and its antiserum to produce anti-GA monoclonal antibody and to establish a fast assay for GA content by an ELISA.Methods The conjugate antigen GA-BSA was artificially coupled and identified by matrix-assisted laser absorption ionization time-of-flight mass spectrometry(MALDI-TOF-MS).BALB/c mice were immunized with GA-BSA to prepare antiserum against GA.The antiserum titer and specificity were detected by indirect ELISA and competitive ELISA,respectively.Results The conjugating ratio of GA and carrier BSA was 7∶1.The antiserum titer was 1∶8 000 and it reacted specifically to the GA.Conclusion The successfully synthesized conjugate antigen GA-BSA implies its feasibility in the establishment of fast immunoassay for the GA content determination国家自然科学基金资助(No.30572316

Research and fabrication of silicon based metal-semiconductor-metal photodetector with U-shape trench interdigitated electrodes

为了提高硅MSM结构光电探测器的光电响应度,制备了U型凹槽电极结构的探测器。5 V偏压下,对650 nm波长入射光的绝对光电响应度测试表明,凹槽电极结构的探测器最大光电响应度值为0.486 A/W,比同样尺寸的平版结构光电探测器提高了约6倍。文中也对比了具有抗反射膜和不具有抗反射膜的器件相对响应光谱的差别,并且比较分析了叉指间隙分别为5μm和10μm器件光电响应的不同。The responsivity of silicon based metal-semiconductor-metal(MSM) photodetector(Si-MSM-PD) was improved by placing the planar interdigitated electrodes with U-shape trench interdigitated electrodes.The performance test indicates that the responsivity of Si-MSM-PD with U-shape trench interdigitated electrodes is 0.486 A/W for 650 nm laser at 5 V applied voltage.This responsivity is about 6 times larger than that of Si-MSM-PD with planar interdigitated electrodes whose responsivity is just 0.084 A/W.Besides,the performance of Si-MSM-PDs with different intergitated space of 5 μm and 10 μm was compared.国家自然科学基金资助项目(60576001,60336010,60676027);; 福建省自然科学基金资助项目(A0410008

Response of Prorocentrum minimum growth to zinc limitation

研究了低中高 3种Zn2 + 浓度下 ,赤潮藻微小原甲藻的生长和生理响应 .结果表明 ,低Zn(1.4pmol·L-1)下 ,藻细胞的比生长速率和稳定期生物量分别为 0 .4 0d-1和 5 110 0cell·ml-1.当Zn2 + 浓度超过2 4 .4pmol·L-1时 ,提高Zn2 + 浓度 (181.6pmol·L-1) ,藻细胞的比生长速率没有改变 ,为 0 .93d-1,而稳定期生物量则略有下降 ,但均明显高于低Zn条件下藻细胞的比生长速率和稳定期生物量 .Zn限制条件下藻细胞的叶绿素a合成受到影响 ,藻细胞光合作用需在更高光强下达到饱和 .随着Zn2 + 浓度增加藻细胞光饱和的光合作用速率 (Pm)及光合作用效率 (α)均明显增大 .研究表明 ,富营养化水体中 ,高的Zn浓度是一定条件下触发赤潮藻类爆发性增殖的重要因子之一 .Studies on the growth and physiological response of red tide alga Prorocentrum minimum to three Zn 2+ levels were showed that the specific growth rate and biomass were limited in low Zn 2+-grown cells (1.4 pmol·L -1, which were 0.40 d -1 and 51100 cell·ml -1 respectively. The specific growth rate was not significantly different when the Zn 2+ concentration in medium was increased over 24.4 pmol·L -1,but there was a slight decrease in biomass; however, both specific growth rate and biomass were much higher than those in low Zn 2+-grown cells. It was also showed that chlorophyll a synthesis was limited due to Zn 2+ deficient,and therefore,the cells became light saturated at higher irradiance under Zn-limited condition. Light-saturated photosynthetic rates (Pm) and photosynthetic efficiency (α) increased significantly with increasing Zn 2+ concentrations. It was concluded that Zn 2+ concentration might be one of the key factors affecting red tide blooms in eutrophication environment.国家重点基础研究发展规划项目 ( 2 0 0 1CB40 970 6);; 国家自然科学基金资助项目 ( 2 0 1760 60 )

XPS Dissection of the Optical Transition Additive in Farm Film

报道了无保护气氛条件下,采用高温固相还原法合成适用于农用塑料地膜的光转换添加剂,共掺铜、铕激活剂的硫化钙(CaS)无机荧光材料,用X射线光电子能谱(XPS)方法对光转换添加剂中不同工艺下激活剂元素进行表征,再通过光致发光谱、透射光谱测量,探索材料中激活剂的能量传输特性,为高新农业的发展提供清洁能源。An optical transition additive used in farmfilmwas synthesized by doping the Cu and Eu activators into an inorganic fluorescent material,CaS with the high-temperature solid phase reduction method under unˉprotected atmosphere.The characteristics of the activators in the films prepared under different conditions were measured by X-ray photo-electron spectroscopy.The energy-transfer properties of the activators in the films were investigated by the photo-induced luminescence spectra and transmission spectra.It is useful for developing a clean energy source in agriculture.福建省自然科学基金资助项目(A0110006);; 厦门大学自选课题基金资助项目(Y07007

Design and Implementation of Mobile Shopping System

[[abstract]]本論文中，我們提出一套為購物中心所設計的購物系統，名為“行動購物系統”，未來消費者在購物中心購物時，不再需要將商品放到購物車裡。此行動購物系統具備ZigBee無線網路、RFID與MySQL資料庫，並以掌上購物車取代傳統的購物車。消費者不僅可以觀看架上的商品，還可以使用掌上購物車從商品的RFID標籤中讀取編號，並透過無線網路向後端的資料庫查詢更多該商品的詳細資訊，當消費者決定購買時，只要將商品編號儲存於掌上購物車的購物籃內，不必再推著龐大又笨重的傳統購物車繼續遊逛購物中心。相似於商品編號查詢，消費者也可藉由商品類別向資料庫查詢特定類別的商品資訊，並將欲購買的商品編號儲存於購物籃中。結束購物時，消費者只要在掌上購物車上按一下按鈕便可藉由無線網路通知購物中心的後端準備好所有購買的商品。此外消費者可將掌上購物車與數個小型無線網路裝置藉由無線網路的綁定方法，創立個人的網路群組，其中小型無線網路裝置為朋友或家人所配戴，之後消費者既可從掌上購物車監控群組內所有成員的位置。整個系統設計的目的是為了提供消費者更輕鬆、舒適的購物體驗。[[abstract]]In this thesis, we proposed a new shopping system, named Mobile Shopping System (MSS), for future large shopping malls where users no longer need to put all goods in the cart during shopping. The MSS is implemented with technologies including ZigBee networks, RFID, and MySQL database. Handheld Shopping Carts (HSCs) are developed to replace the traditional shopping cart. A customer can look and check goods on the shelf in the mall. With a HSC, a customer can read the ID from the RFID tag of the good with interest and query the detail information about it from the back-end database wirelessly. Once the customer decides to purchase it, he/she just saves the ID in the basket of HSC. The customer can continue shopping without pull the traditional huge and heavy shopping cart. Similar to the query by good ID, customers can also use the category query to query the information about goods of a special category from the database and save all goods to purchase in the basket. To check out, a customer just clicks one button to wirelessly notify the back-end employee of the mall, who will prepare the goods. Moreover, a customer can create a personal group by binding with Small Wireless Network Devices (SWNDs) with the HSC. With SWNDs carried by friends or family, the customer can monitor the locations of all group members by the HSC. The design goal of the whole system is to provide easy and comfortable shopping experience.[[note]]碩

New Anodic Oxidized Technology OF Porous Silicon

【中文文摘】在适当条件下氧化多孔硅是提高多孔硅发光强度的良好途径,提出了一种新型阳极氧化方法,并探讨了该方法所涉及的阳极氧化条件。采用含CH3CSNH2的HF酸水溶液作为氧化剂对初始多孔硅进行了湿法阳极氧化,发现氧化使多孔硅光致发光性质得到极大改善,进而研究了氧化电流、氧化温度、氧化时间等一系列因素对氧化多孔硅光致发光强度的影响,并给出了合理解释。实验发现,在1mA,10min,60℃的氧化条件下,采用阳极氧化技术使多孔硅发光强度增强了18倍。 【英文文摘】Oxidizing porous silicon in proper condition is a good approach to improve PS photoluminescence intensity.The article for the first time raised a new anodic oxidized technology of PS.We used electrolyte containing CH_3CSNH_2 to oxidize initial PS, and found that this method can improve the quality of photoluminescence, it can not only enhance the PL intensity greatly, but also increase the photoluminescence stability. Then we studied the oxidizing conditions(current, time, temperature etc.)which affect photoluminescence intensity and stability of PS and gave reasonable explanations. The small oxidizing current can repair the nanostructure of PS , the appropriate oxidizing time can limit the probability of nonradiative recombination , while the optimum oxidizing temperature is propitious to the transit of charge which can make the concentration of electrolyte balanceable , hence , the photoluminescence of oxidized PS is improved evidently. We discovered that the anodic oxidized technology of PS made the integral intensity of photoluminescence enhanced 18 times when in the optimum oxidized conditions of (1mA ,10 min ,60 ℃)国家重点自然科学基金资助项目(60336010

A New Method for Wet Passivating of Porous Silicon

采用硫代乙酰胺的HF酸水溶液作为氧化剂对初始多孔硅进行钝化处理,改善了多孔硅表面结构并提高了发光强度.同时研究了钝化电流,钝化温度和钝化时间等一系列因素对钝化多孔硅光致发光强度的影响.实验发现,在60℃恒温下,对样品通电流1mA/cm2,进行10min的钝化处理可以获得最强的光致发光,发光强度比初始样品发光强度增强了一个数量级.另外,通过傅立叶红外吸收谱(FTIR)以及X射线光电子能谱(XPS)测试分析,探讨了钝化处理使得多孔硅发光强度提高的原因.国家自然基金项目(60336010)资

The study on Moisture Suction in Soil under Shed Protection

主要研究了黑龙江省哈尔滨市一定点大棚内，其土壤水吸力的动态变化.研究表明：0~30CM层次大棚土壤水吸力底层大于表层，表明土壤水分运动方向是从底层流向表层.水吸力在100~400x102PA时，土壤水分处于田间持水量到毛管断裂含水量之间，水分有效性最大.但受人工灌水方式的影响，这种情况只占水分状况的41.8%，其余水分状况或多或少，表明大棚土壤的水分状况不理想.水吸力在4~10月份的生长期内呈周期性变化.This study dealt mainly with the dynamic variation of moisture suction in soil under shed protection in Harbin,Heilongjiang Province.The results showed that the bottom moisture suction in 0￣30cm was more than upper, which indicated that the movement of water was from bottom to upper.When moisture suction was 100￣400cm,the water was between field moisture capacity and capillary disrupting moisture, and the water was the most efficient.But this was affected by irrigation, which was only 41.8% of total water regime, and the rest was more or less, indicating that the water regime in soil under shed protection was not very well