采用激光光热偏转法直接测量稀染料溶液的绝对荧光量子产额

报道了一种采用激光光热偏转法直接测量稀染料溶液的绝对荧光量子产额的新方法，以若丹明６Ｇ甲醇溶液为样品，证实了该方法的可行性，并讨论了其优缺点。     

铝箔腐蚀液中硫酸根离子的测定

在阳离子表面活性剂——十六烷基三甲基溴化铵（ＣＴＭＡＢ）的存在下，用比浊法对铝箔蚀腐液中微量硫酸根离子进行测定。硫酸根离子含量在３．０×１０－４～２．４×１０－３ｇ／５５ｍＬ范围内符合比耳定律     

适合低功耗便携式血糖仪的SoC芯片与方案实现

本文介绍了适合便携式血糖仪的低功耗SoC芯片结构和性能,完成模拟数据采集和信号处理功能。本文还阐述了SoC芯片在血糖仪中的软硬件设计,并进一步说明了SoC设计在实际应用中的几个重要功能,例如低功耗睡眠模式,低噪声运放与温度传感器等。血糖和酶电极反应时所产生的微弱电流经过放大、滤波、模数变换后经SoC芯片数据处理,在液晶显示器上显示出测试结果。本文所提出的SoC设计整合低噪声运算放大器转换微弱的血糖信号成电压信号,测试范围达1.1-33.3mmol/L,单次采血量仅为3μL,完成一次测试的时间约4秒,片外的EEPROM可以存储256组历史记录,还具有自动温度补偿与校正功能,适合个人、家庭或医院使用。     

基于C805 IF系列单片机的血糖仪解决方案

本文基于多年使用C8051F单片机开发的经验,提出了一种低成本,高精度,稳定可靠的血糖仪解决方案,实际样机的测试表明,该方案结构简单,测量重复性好,精度高;针对使用该设备终端用户的不同设置了不同的操作模式,模式间切换简单.为测量过程设计了多种数据处理和补偿方案,使设备适应环境能力大大增强,具有较强的实用价值.     

基于C8051F系列单片机的血糖仪解决方案

本文基于多年使用C8051F单片机开发的经验，提出了一种低成本，高精度，稳定可靠的血糖仪解决方案，实际样机的测试表明，该方案结构简单，测量重复性好，精度高；针对使用该设备终端用户的不同设置了不同的操作模式，模式间切换简单。为测量过程设计了多种数据处理和补偿方案，使设备适应环境能力大大增强，具有较强的实用价值。     

基于滤纸富集技术的LIBS污水检测

将滤纸作为基底用于LIBS测定水溶液中的金属元素,分析了不同的滤纸浸泡时间对LIBS信号的影响,以及在不同质量浓度的情况下,分析浸泡时间与信号的关系.以实验室配置的不同浓度的偏砷酸钠溶液为研究对象,对浸泡时间为10s和60s的As元素和Na元素做了探测分析并得到了其定标曲线,初步确定了在As元素和Na元素在不同时间下的检测限分别为:As元素0.379g/L(10s)、0.224g/L(60s);Na元素0.021g/L(10s)、0.018g/L(60s).实验所得的结果为探测工业废水中金属元素的含量提供依据.     

Electrocatalytic Water Oxidation at Neutral pH by a Nanostructured Co(PO3)2 Anode

Cobalt metaphosphate Co(PO₃)₂ nanoparticles are prepared via the thermolytic molecular precursor (TMP) method. A Ni form electrode decorated with Co(PO₃)₂ nanoparticles is evaluated as an anode for water oxidation electrocatalysis in pH 6.4 phosphate‐buffered water. Catalytic onset occurs at an overpotential of ca. 310 mV, which is 100 mV lower than that observed for Co₃O₄ nanoparticles, with a comparable surface area under identical conditions. A per‐metal turnover frequency (TOF) of 0.10–0.21 s^?1 is observed at an overpotential, η, of 440 mV, which is comparable to the highest rate reported for a first‐row metal heterogeneous catalyst. Post‐catalytic characterization of the catalyst resting state by X‐ray photoelectron spectroscopy (XPS) and Raman spectroscopy reveals that surface rearrangement occurs, resulting in an oxide‐like surface overlayer.     

Determination of interface-state parameters in a MOS capacitor by DLTS

A modification of the DLTS (Deep Level Transient Spectroscopy) technique for interface-state measurement is described in which the surface potential is used to determine the energy of the interface states contributing to the emission signal. This technique allows an accurate and unambiguous determination of interface-state energies and cross sections. Expressions are determined for interface-state emission as a function of surface potential. Measurements of interface-state density and majority-carrier cross sections as functions of energy for n- and p-type MOS samples are presented.     

Determination of galvanomagnetic coefficients by a one-point method

A new measurement geometry is proposed to determine the local galvanomagnetic coefficients in semiconductors by measuring $\text{ΔR}\text{R}{}_0$, the relative change in spreading resistance of a low resistivity ohmic point contact due to the magnetic field.The potential problem is solved in the weak-magnetic-field limit and an explicit expression is given for $\text{ΔR}\text{R}{}_0$ vs. galvanomagnetic coefficients and crystal orientation. In the ideal case (semi-infinite crystal) it is an important feature of this geometry that neither the contact diameter nor the Hall field (the first order term in the magnetic field) enter into the result.The method is verified by measurements made on n-type gallium arsenide and n-type germanium. The experiments show that this is a quick and accurate method to determine the Hall mobility on high mobility materials. The effect of different factors on the measurement accuracy is considered, and it is shown that the errors caused by finite sample dimensions are about 1%, if the ratio of contact diameter to the sample dimension is of the order of 1:20.     

Universal Glucose Models for Predicting Subcutaneous Glucose Concentration in Humans

This paper tests the hypothesis that a “universal,” data-driven model can be developed based on glucose data from one diabetic subject, and subsequently applied to predict subcutaneous glucose concentrations of other subjects, even of those with different types of diabetes. We employed three separate studies, each utilizing a different continuous glucose monitoring (CGM) device, to verify the model's universality. Two out of the three studies involved subjects with type 1 diabetes and the other one with type 2 diabetes. We first filtered the subcutaneous glucose concentration data by imposing constraints on their rate of change. Then, using the filtered data, we developed data-driven autoregressive models of order 30, and used them to make short-term, 30-min-ahead glucose-concentration predictions. We used same-subject model predictions as a reference for comparisons against cross-subject and cross-study model predictions, which were evaluated using the root-mean-squared error (RMSE) and Clarke error grid analysis (EGA). We found that, for each studied subject, the average cross-subject and cross-study RMSEs of the predictions were small and indistinguishable from those obtained with the same-subject models. These observations were corroborated by EGA, where better than 99.0% of the paired sensor-predicted glucose concentrations lay in the clinically acceptable zone A. In addition, the predictive capability of the models was found not to be affected by diabetes type, subject age, CGM device, and interindividual differences. We conclude that it is feasible to develop universal glucose models that allow for clinical use of predictive algorithms and CGM devices for proactive therapy of diabetic patients.      

Solution of a periodic boundary-value problem by direct application of Floquet's theorem

Laplace's equation is solved under periodic-boundary conditions, by consideration of one period, by direct use of Floquet's theorem. Successive point over-relaxation computer techniques are used. Such solutions require the use of complex mesh points, and convergence is rapid. Analytical results are compared.     

旅行商问题的一种模拟退火算法求解

旅行商问题(TSP)是组合优化领域里的一个典型的、易于描述却难以处理的NP难题,其可能的路径数目与城市数目是呈指数型增长的,求解非常困难。首先介绍了旅行商问题,模拟退火算法原理及其算法实现。应用模拟退火算法对TSP进行研究,给出解决TSP的一种比较精确的算法并用Matlab实现了算法。最后用该算法对TSP进行了仿真,验证了该算法的有效性。     

Frequency Transformation of a Whistler Wave by A Collapsing Plasma Medium in a Cavity: FDTD Solution

A whistler wave in a cavity filled with a magnetoplasma medium is strongly affected when the plasma source is switched-off. Due to such a collapse of the plasma, the whistler wave is converted to an electric- field-intensified higher frequency wave (with an order of magnitude upshift of the frequency). In principle, it is possible to transform a 2.45 GHz source radiation to 300 GHz Terahertz radiation, with significant strength of the electric field. Finite difference time domain (FDTD) technique is used to study the effect of the following parameters: the rate of collapse, spatial plasma-density profile, collision frequency as well as the switching angle.      

Mutual admittance of slots on a cone: Solution by Ray technique

An approximate asymptotic Green's function for the surface magnetic field due to a magnetic dipole on a general convex conducting surface is developed. Based largely on the classical work of V. A. Fock and the current GTD recipes, this solution is presented in a form that admits ray interpretations, and can be simply evaluated. We apply the Green's function to calculate the mutual admittance between two slots on a cone. The numerical results are in very good agreement with experiments.     

High-Capacity and Stable Sodium-Sulfur Battery Enabled by Confined Electrocatalytic Polysulfides Full Conversion

The efficient polysulfide capture and reversible sulfur recovery during reverse charging process are critical to exploiting the full potential of room temperature Na S batteries. Here, based on a core-shell design strategy, the structural and chemical synergistic manipulation of sodium polysulfides quasi-solid-state reversible conversion is proposed. The sulfur is encapsulated in the multi-pores of 3D interconnected carbon fiber as the core structure. The Fe(CN)₆⁴⁻-doped polypyrrole film serves as a redox-active polar shell to lock up polysulfides and promote complete polysulfide conversion. Importantly, the short-chain Na₂S₄ polysulfides are reduced to Na₂S directly leaving with a small fraction of soluble intermediates as the cation-transfer medium at the core/shell interface, and freeing up formation of solid Na₂S₂ incomplete product. Further, the redox mediator with open Fe species electrocatalytically lowers the Na₂S oxidation energy barrier and renders the high reversibility of electrodeposited Na₂S. The tunable quasi-solid-state reversible sulfur conversion under versatile polymer sheath greatly enhances sulfur utilization, affording a remarkable capacity of 1071 mAh g⁻¹ and a stable high capacity of 700 mAh g⁻¹ at 200 mA g⁻¹ after 200 cycles. The confined electrocatalytic effect provides a strategy for tuning electrochemical pathway of sulfur species and guarantees high-efficiency sulfur electrochemistry.     

应对RoHS指令——软件全面解决方案

通过分析欧盟RoHS等环保法规和目前对应的现状，提出了软件系统的全面解决方案。并讨论了该软件系统的设计和应用。     

近红外光谱无创血糖检测中的生理背景问题

分析了目前直接利用携带复杂组织背景信息的人体近红外光谱进行无创血糖检测方法存在的技术障碍：作为主要信息载体的人体生理背景成分复杂、易变,导致测得的人体近红外光谱无法反映血液中血糖浓度的变化信息,因此,其检测精度很难达到临床应用的要求。提出一种新方法,即利用血流容积一直在变而人体组织背景和血液成分含量短时间不变的事实,消除人体组织背景干扰,获得只反映血液信息的＂纯净＂光谱,将近红外无创血糖检测技术的重点问题转移到如何得到具有较高信噪比的光谱数据,为该技术的临床应用提供了可能性。     

随机Petri网非乘积解系统的判定与界限求解

本文基于随机Petri网(SPN)提出了一种利用站平衡来判断非乘积解系统模型的方法,发现了可能导致站不平衡的三种Petri网结构,对这三种结构进行了分析,得出了产生非乘积解的系统原因,并给出了一种利用乘积解求解非乘积解系统模型性能界限的方法,这种方法可广泛应用于多种实际系统的性能界限求解.     

Solution of a difference equation in diffraction theory

A simple technique is described for solving a class of second-order functional difference equations that occur in diffraction problems involving edges and corners     

Waveguides of Arbitrary Cross Section by Solution of a Nonlinear Integral Eigenvalue Equation

The problem of electromagnetic wave propagation in hollow conducting waveguides of arbitrary cross section is formulated as an integro-differential equation in terms of fields at the waveguide boundary. Cutoff wave numbers and wall currents appear as eigenvalues and eigenfunctions of a nonlinear eigenvalue problem involving an integro-differential operator. A variational solution is effected by reducing the problem to matrix form using the method of moments. A specific solution of the problem is developed using triangle expansion functions in the method of moments. The solution is simplified by symmetry considerations and is implemented by two digital computer programs. Listings and full documentation of these programs are available. This solution yields accurate determinations of cutoff wave numbers, wall currents, and distributions of both longitudinal and transverse modal field components for the first several modes. Illustrative computations are presented for the single-ridge waveguide, which has a complicated boundary shape that does not lend itself to exact solution.