STC12C5A60S2单片机及其SD卡读写设计

分析了基于STC单片机的SD卡的读写操作，给出了一种基于高速、低功耗、超强抗干扰的新一代STC12C5A60S2系列IT单片机的SD卡读写方法。该方法利用串行外围接口总线与SD卡相连，从而实现了对SD卡的数据读写。     

金士顿“Ultimate”SD卡

金士顿公司新推出了“Ultimate”SD高速卡。现只提供512MB以及1GB容量两种型号，分别为SD／512-UFE和SD／1GB—UFE。     

SDHC卡将取代SD卡

当普通的DC都具备了摄像功能之后,SD卡有限的容量便是用户的心头之痛。于是作为SD卡的继承者SDHC（High Capacity SD Memory Card即高容量SD存储卡）应运而生,它的最高容量可达32GB。其主要特征在于文件格式从以前的FAT12、FAT16提升到了FAT32,而且最高支持32GB。同时传输速度被重新定义为class2（2MB／sec）、class4（4MB／sec）、class6（6MB／sec）等级别。     

SD卡在模糊自适应温度控制系统中的应用研究

以SD卡数据存储技术为核心,通过C8051F020单片机,将温度控制过程的温度数据采集后,写入大容量SD卡存储,并通过VC++对温度控制过程中的数据进行分析处理,设计并实现了SD卡在模糊自适应温度控制系统中大量数据采集的应用。本文主要介绍了模糊自适应温度控制系统中SD卡的硬件接口电路、SD卡的操作流程、温度数据采集,温度控制过程的曲线绘制,并通过实际使用结果验证了所提出方法的有效性。     

应用软件工程学的SA和SD方法开发数据处理系统

随着IT领域的发展,SA、SD及SE渐渐的成为了大型项目必需要的专业分工,这三者间是有相当的差异的,不管是养成过程,甚或是未来的发展,都大相径庭,而要成为一名称职的PM,是要能区分出这三者的差异,才能妥善的安排工作的。分析SA和SD的技术框架以及各个组成部分,最后通过案例分析阐述如何利用SA和SD来进行网构软件开发。     

SD车载及家庭音响系统

SD家庭音响系统包括车载音响、家庭音响和便携式音响3个部分，三者的共同特点在于都采用SD卡作为主要介质。SD车载及家庭音响系统采用优质、便携式音箱，可播放来自各种音源的数字音乐，他内置硬盘和CD机，并且具有标准USB接口和SD卡扩展插槽，能够播放来自CD光盘、外接存储器及SD卡的音频内容。     

SD振子,SD吸引子及其应用

提供一个新振子命名为SD振子，受扰振子的吸引子称为SD吸引子，它的动力学行为决定于一个光滑参数α的连续变化。这是一个具有强非线性特征的振动系统，它提供了一个从光滑动力学行为向不连续动力学行为光滑转迁的典型示范，这种直接的转迁并不需要连续系统的过渡。当系统为光滑动力学性态时，表现出与Duffing系统类似的双井等标准动力学行为，而当系统表现为不连续性态时，提供一个新的非连续动力系统模型，它除了表现为标准的双井动力学行为外，也表现出一些新的非标准动力学行为。文中展示了这个系统的转迁过程和特性及其相应的吸引子的复杂动力学行为。     

SD成型剂对Ti(C,N)基金属陶瓷显微结构和力学性能的影响

采用低压烧结的方法制备Ti(C,N)基金属陶瓷材料,并结合C、N、O分析,XRD、BSE、EDS等测试手段研究了SD成型剂对Ti(C,N)基金属陶瓷合金的C含量、相组成及显微结构和力学性能的影响。结果表明,随着SD成型剂添加量的增加,脱胶后压坯的C含量逐渐增加,N含量逐渐减小;烧结后Ti(C,N)基金属陶瓷由(Ti,Me)(C,N)(Me=W、Mo、Ta)和Ni/Co固溶体相组成;显微组织以黑芯-白环结构为主,并伴随着少量白芯-灰环的结构。SD添加量为100mL/kg时,Ti(C,N)基金属陶瓷材料的抗弯强度达1929MPa,硬度为1588HV30,添加量为180mL/kg时,合金组织中石墨相的出现使其抗弯强度大幅度下降。     

玛米亚RB67 PRO SD相机

玛米亚（Mamiya）RB67 PRO SD（以下简称RB67SD）,是日本玛米亚公司1990年推出的第3款6×7中片幅的专业单反相机。第1款RB67PRO诞生于1970年,该机首创单反相机可旋转片盒结构,开创了6×7片幅单反相机的先河。与第2款RB67 PRO S相比,RB67SD增大了机身镜头座口径,能够适配75mm移轴镜头及500mmAPO长焦镜头,并为今后可能进一步拓展镜头的功能奠定了基础。RB67系列相机的构造部分采用了类似哈苏Sxx系列相机的设计方案,整机采用部件组合方式,镜头、取景器、胶片片盒、旋转框架都能方便快速地拆卸与组合,与其配套的镜头也都装备镜间快门,所有零部件制造精密细致,构造合理,体现出玛米亚公司在专业相机领域中的实力。     

基于SD卡的联合收割机测产系统数据存储模块设计

作为“精细农业”的一部分,联合收割机测产系统负责采集地块中的各种数据（产量,经度,纬度,时间等）,并通过数据存储模块将数据存储、传输到计算机,进行后续处理。通过对现有几种数据存储模块方案的优劣分析,本文提出了通过单片机STC89C58控制SD卡存储、传递数据的方案,并进行了现场实验。实验结果表明,该模块满足了使用要求,功能良好,适合于野外现场数据采集系统中数据传输及数据的大容量存储。     

A ceria NPs decorated graphene nano-composite sensor for sulfadiazine determination in pharmaceutical formulation

Since the importance of sulfonamide compound determinations, in this work, Sulfadiazine (SDZ), one of the significant sulfonamide antibiotics was electrochemically studied. SDZ is listed as world health organization (WHO) crucial medications in treatment of basic health system. A new graphene based nano-composite electrode was made and used for the electrochemical studies of some sulfondiamides. Electrochemical behavior of the compounds was initially investigated on bare and modified carbon paste electrodes using cyclic voltammetry (CV). The modifiers include Ceria (CeO₂) NPs, reduced graphene oxide (RGO) and RGO decorated CeO₂ NPs. The composition of 5% RGO decorated CeO₂ nanoparticles, 65% graphite, and 30% paraffin presented the best redox response for Sulfadiazine. Then, the nano-composite electrode was applied for SDZ measurement by fast Fourier transform square wave voltammetry (FFTSWV) on the proposed nano-composite electrode. Response linear range was obtained for 3–10 µM (R²?=?0.9956) and 30–1000 µM (R²?=?0.9948) of SDZ concentration, respectively, with LOD of 0.17 µM and LOQ of 3 µM. Finally, SDZ content in some pharmaceutical formulations were effectively analyzed by the proposed method and acceptable relative error of 4.6% was achieved.     

反相液相色谱法测定复方泰妙菌素注射液中泰妙菌素、磺胺嘧啶钠的含量

目的：建立反相液相色谱法测定复方泰妙菌素注射液中泰妙菌素、磺胺嘧啶钠的含量的方法。方法：采用Shim—packCLC—ODS柱（150mm×6mm,5μm）,流动相为80％乙腈-0．7％磷酸氢二铵（体积比为0．3：0．7）并用氨试液调节pH至8．0±0．1。流速为1．0mL／min,检测波长为208nm,柱温为40℃。结果：在此色谱条件下两者能完全分离,泰妙菌素在5-40μg／mL和磺胺嘧啶钠在10—80μg／mL的范围内浓度与峰面积呈良好的线性关系,回归方程和相关系数分别为：A=47205．9p＋2003．72,R=0．9999;A=77050p＋5514．75,R=0．9999。泰妙菌素和磺胺嘧啶钠的平均回8：4分别为99．99％、99．7％;RSD分别为0．70％、0．95％。结论：方法简便、快速、准确,可用作复方泰妙菌素注射液的含量测定。     

Preparation and Evaluation Of Drug-Containing Chitosan Beads

Abstract

Sulfadiazine beads were prepared by dropping drug-containing solutions of the positively charged polysaccharide, chitosan, into tripolyphosphate (TPP) solutions. The droplets instantaneously formed gelled spheres by ionotropic gelation, entrapping the drug within a three-dimensional network of the ionically linked polymer. To achieve maximum drug content, high payloads, short gelation times, low TPP concentrations, and a low internal to external phase ratio were required. The chitosan beads showed pH-dependent swelling and dissolution behavior. The beads swelled and dissolved in 0.1N HCl, while they stayed intact in simulated intestinal fluid. The release of sulfadiazine in 0.1N HCl decreased with increasing concentration of TPP, but was independent of the TPP concentration in intestinal fluids. The morphology of the beads was investigated by scanning electron microscopy. The porosity of the beads depended on the method of drying.     

Preparation and Evaluation Of Drug-Containing Chitosan Beads

Sulfadiazine beads were prepared by dropping drug-containing solutions of the positively charged polysaccharide, chitosan, into tripolyphosphate (TPP) solutions. The droplets instantaneously formed gelled spheres by ionotropic gelation, entrapping the drug within a three-dimensional network of the ionically linked polymer. To achieve maximum drug content, high payloads, short gelation times, low TPP concentrations, and a low internal to external phase ratio were required. The chitosan beads showed pH-dependent swelling and dissolution behavior. The beads swelled and dissolved in 0.1N HCl, while they stayed intact in simulated intestinal fluid. The release of sulfadiazine in 0.1N HCl decreased with increasing concentration of TPP, but was independent of the TPP concentration in intestinal fluids. The morphology of the beads was investigated by scanning electron microscopy. The porosity of the beads depended on the method of drying.     

磺胺嘧啶银/聚乙烯醇水凝胶复合材料的制备及性能表征

采用e-Beam电子辐射和冻融循环相结合的方法制备了磺胺嘧啶银(SD-Ag)/聚乙烯醇(PVA)水凝胶。研究了制备工艺对PVA水凝胶的性能的影响。通过拉伸性能测试、吸水率检测、SEM和FT-IR等表征,考察了PVA浓度(占总质量5%~15%)、冻融与辐射处理等对PVA水凝胶拉伸强度、断裂伸长率、吸水性、凝胶含量和微观结构等的影响。结果表明:随着PVA浓度增大,PVA水凝胶的拉伸强度提高。当PVA浓度为15%、辐射剂量为25kGy时,单独辐射、辐射后冻融及冻融后辐射三种工艺制备的PVA水凝胶拉伸强度分别为0.023 MPa、0.048MPa、0.028MPa,吸水率分别为为95%、45%、63%,说明经冻融处理的水凝胶力学强度提高,吸水率有所下降。然后,选择适当的制备工艺并在PVA水凝胶中加入SD-Ag,考察了SD-Ag/PVA水凝胶的抑菌性能,抑菌活性测试结果显示,随着SD-Ag含量的增加,SD-Ag/PVA水凝胶的抑菌效果增强,而且其对革兰式阴性菌(大肠杆菌)的抑菌效果优于其对革兰式阳性菌(金黄色葡萄球菌)的抑菌效果。     

Radiolabeling,quality control,and biodistribution of <Superscript>99m</Superscript>Tc-sulfadiazine as an infection imaging agent

Abstract—Sulfadiazine (antibiotic used for treating bacterial infections) was labeled with ^99mTc with the aim of the development of a new radiopharmaceutical for infection imaging. The influence of the reaction parameters such as the substrate and SnCl₂·2H₂O concentrations, pH of the reaction mixture, and reaction time on the labeling yield was examined, and the labeling conditions were optimized. The maximum radiochemical yield of ^99mTc-sulfadiazine (94.7%) was obtained by using 50 µg of SnCl₂·2H₂O and 1 mg of sulfadiazine at pH 5. The radiochemical purity of the labeled compound was evaluated by ITLC and HPLC. The biological distribution of ^99mTc-sulfadiazine in mice with experimentally induced Staphylococcus aureus infection in the right thigh was studied, and the bacterial infected thigh/normal thigh (target-to-nontarget, T/NT) ratio was evaluated. The T/NT ratio for ^99mTc-sulfadiazine was found to be 3.6, which is comparable to the commercially available ^99mTc-ciprofloxacin (3.8), indicating that ^99mTc-sulfadiazine can be used for infection imaging.     

Electrospun polyvinylidene pyrolidone/gelatin membrane impregnated with silver sulfadiazine as wound dressing for burn treatment

Nanofibrous membranes used for burn treatment have become widely popular due to their large surface area and high porous structure. In this study, electrospinning was used to fabricate a blended nanofibrous membrane of polyvinylidene pyrolidone (PVP) and gelatin, to use as wound dressing. The physical and mechanical properties of this novel membrane were investigated using SEM, FTIR and tensile tests. Results showed that poor mechanical properties of gelatin, which are preferred in medical applications for curing burns as they allow for antigen activity and skin repair, can be enhanced by adding PVP in the solution. Silver sulfadiazine (AgSD), an antibacterial agent, was also impregnated into the PVP/gelatin nanofibrous structure during electrospinning. The membrane thus fabricated showed antibacterial activities against both the Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus. AgSD release behaviour of fabricated samples indicated short-term drug delivery. It was concluded that the proposed drug-loaded membrane can be used as wound dressing, specifically, in treating skin burns.     

Silver sulfadiazine loaded chitosan/chondroitin sulfate films for a potential wound dressing application

Silver sulfadiazine (AgSD) loaded chitosan/chondroitin sulfate (CHI/CS) films were formed to be applied as a potential wound dressing material. The liquid uptake capacity of both, CHI/CS and CHI/CS/AgSD, films exhibited a pH-dependent behavior. Tensile tests showed that the amount of CS used to form the films and the further incorporation of AgSD affect the mechanical properties of the films. In vitro AgSD-release assays showed that the CHI/CS mass ratio influences the AgSD release rate. All the investigated CHI/CS/AgSD films sustain the AgSD release up to 96 h at physiological pH. Antibacterial activity and cell viability assays showed that all the CHI/CS/AgSD films have activity against Pseudomonas aeruginosa and Staphylococcus aureus but they were not toxic to Vero cells. The results presented in this work indicate that the CHI/CS/AgSD exhibits potential to be applied as a wound dressing material.     

Voltammetric sensor based on carbon paste electrode modified with molecular imprinted polymer for determination of sulfadiazine in milk and human serum

A new sensitive voltammetric sensor for determination of sulfadiazine is described. The developed sensor is based on carbon paste electrode modified with sulfadiazine imprinted polymer (MIP) as a recognition element. For comparison, a non-imprinted polymer (NIP) modified carbon paste electrode was prepared. Cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods were performed to study the binding event and electrochemical behavior of sulfadiazine at the modified carbon paste electrodes. The determination of sulfadiazine after its extraction onto the electrode surface was carried out by DPV at 0.92 V vs. Ag/AgCl owing to oxidation of sulfadiazine. Under the optimized operational conditions, the peak current obtained at the MIP modified carbon paste electrode was proportional to the sulfadiazine concentration within the range of 2.0 × 10^? 7–1.0 × 10^? 4 mol L^? 1 with a detection limit and sensitivity of 1.4 × 10^? 7 mol L^? 1 and 4.2 × 10⁵ μA L mol^? 1, respectively. The reproducibility of the developed sensor in terms of relative standard deviation was 2.6%. The sensor was successfully applied for determination of sulfadiazine in spiked cow milk and human serum samples with recovery values in the range of 96.7–100.9%.     

Sulphonamide-imprinted sol–gel materials as ionophores in potentiometric transduction

This work proposes different kind of solid-contact graphite-based electrodes for the selective determination of sulphonamides (SPHs) in pharmaceuticals, biological fluids and aquaculture waters. Sulfadiazine (SDZ) and sulfamethoxazole (SMX) were selected for this purpose for being the most representative compounds of this group. The template molecules were imprinted in sol–gel (ISG) and the resulting material was used as detecting element. This was made by employing it as either a sensing layer or an ionophore of PVC-based membranes and subsequent potentiometric transduction, a strategy never reported before. The corresponding non-imprinted sol–gel (NISG) membranes were used as blank. The effect of plasticizer and kind/charge of ionic lipophilic additive was also studied.The best performance in terms of slope, linearity ranges and signal reproducibility and repeatability was achieved by PVC membranes including a high dielectric constant plasticizer and 15 mg of ISG particles. The corresponding average slope was ?51.4 and ?52.4 mV/decade, linear responses were 9.0 × 10^?6 and 1.7 × 10^?5 M, and limits of detection were 0.74 and 1.3 μg/mL for SDZ and for SMX, respectively. Good selectivity with log Kpot < ?0.3 was observed for carbonate, chloride, fluoride, hydrogenocarbonate, nitrate, nitrite, phosphate, cyanide, sulfate, borate, persulphate, citrate, tartrate, salicylate, tetracycline, ciprofloxacin, sulphamerazine, sulphatiazole, dopamine, glucose, galactose, cysteine and creatinine. The best sensors were successfully applied to the analysis of real samples with relative errors ranging from ?6.8 to + 3.7%.