基于导数直方图和神经网络的色谱基线提取算法

根据基线信号的变化特征,提出了一种新的色谱基线提取算法－基于一阶导数直方图和神经网络的色谱基线提取算法。鉴于信号总是存在着噪声,含噪声的基线信号一阶导数值也较大,并且分布无规律,而采用了多分辨率小波变换滤波技术。通过选择阈值门限,本算法可精确提取出信号的基线,尤其适用于非基线对称类的色谱信号的基线（趋势函数）提取。     

STUDY ON THE RECOVERY OF AgNO3 BY IONEXCEHNGE METHOD FROM THE WASTERS

This paper introduces an improved new method which is used to recover silver as silver nitrate by ion exchange from the wasters.In this method,we can recover silver nitrate,only by using a kind of ion exchange resin and two ion exchange processes.It can replace the original recovery method in which two kinds of ion exchange resins and three ion exchange processes are needed.The result is satisfied     

A novel derivation of collision theory rate constants for a bimolecular reaction

A novel exact derivation for the kinetic constant of a bimolecular reaction according to three well-known models of collision theory is reported. The use of probability density functions, with the introduction of a novel geometry to study the collision process, allows simplifying the derivation to such an extent, that, for a proper statistical background, it is is possible to recover the line-of-centers and the angular dependent line-of-centers models in no more than a couple of lectures. Although the derivation is introduced to recover the temperature-dependent kinetic constant, it is shown that the energy-dependent reactive cross section can be recovered as well. A possible confusion in the interpretation of the pre-exponential factor is commented.     

单纯形法用于非那西丁副产物大苏打回收工艺的探讨

采用单纯形法研究了非那西丁副产物大苏打的回收工艺。考察了反应温度、终点pH值等因素对收率及反应时间的影响，优化了生产工艺。     

Liquid/liquid separation of polysiloxane-supported catalysts

Liquid/liquid separation after monophasic reactions is a viable way to use and recover polysiloxane-supported catalysts.     

Further tests of the approximate double substitution coupled-cluster method

Comparisons are made between the approximate form (ACCD ) of double substitution coupled-cluster theory and the complete form (CCD) in the evaluation of total correlation energies, molecular structures, vibrational frequencies, bond lengths, dissociation energies, permanent electrical moments, and electric field gradients. Though ACCD may recover as little as half of the higher-order correlation energy when that energy is small, it does recover a very high percentage when that energy is large. ACCD and CCD potential surfaces tend to have similar shape, and for many molecular properties, the results show ACCD to be very nearly equivalent to CCD.     

电缆护套光屏蔽自愈合涂料的制备及性能

以环糊精修饰的二氧化钛纳米粒子作为光屏蔽剂，利用环糊精与金刚烷的包合作用作为自修复作用力制备了一种具有自愈合性能的光屏蔽涂料，并研究了其光屏蔽性能和自愈合性能.研究结果表明，该涂料能够与电缆护套软质基材牢固结合，具有较好的疏水性和较低的吸湿率（在相对湿度75%的环境中放置48 h后水接触角>90°；在相对湿度54%的环境中吸湿率<2%）；该材料对紫外光具有较好的光屏蔽性能（紫外光屏蔽率>90%），并表现出良好的自愈合性能，在遭受损伤时，裂痕能反复多次恢复，拉伸性能可恢复80%以上.     

Recovery of ammonia from wastewater through chemical precipitation

Journal of Thermal Analysis and Calorimetry - Chemical precipitation is a consolidated technique applied in wastewater treatment to remove and recover phosphorous and ammonium that remain in the...     

Calculation of cryoscopic data

The accuracies of determinations of purity and freezing point based upon cryometric freezes suffer from the scatter of data, from the failure of systems ever to recover from the effects of supercooling, and from complex phenomena that elevate temperature during the later parts of runs. Methods are here proposed for decreasing the errors caused by scatter of data and failure to recover from supercooling. These methods utilize the optical projection of calculated curves upon the actual data and involve a new interpretation of the nature of recovery from supercooling.     

Analysis of pesticide residues in fruit and vegetables with ethyl acetate extraction using gas and liquid chromatography with tandem mass spectrometric detection

A multiresidue method based on extraction with ethyl acetate has been used at the Swedish National Food Administration since 1989 to monitor pesticide residues in fruit and vegetables. The method has been continuously adjusted, resulting in simple and quick analyses of pesticide residues. To recover basic pesticides, the addition of an alkali is necessary. The addition of sodium hydrogen carbonate has been shown to recover all pesticides effectively without any degradation. The liquid chromatography (LC) with tandem mass spectrometry (MS/MS) technique has made it possible to analyse more polar pesticides and to replace many single methods. The latest development in the multiresidue method, comprising the use of gas chromatography (GC) with MS/MS, has further improved the analysis by replacing the conventional GC detectors. The need for cleanup has been reduced or eliminated entirely. Consequently, the method has been simplified in a way that makes it possible to recover all included analytes in many different matrices in one single extraction and to detect them either with GC-MS/MS or with LC-MS/MS.     

Resolution of a distribution of distances by fluorescence energy transfer and frequency-domain fluorometry

We used frequency-domain fluroscence spectroscopy to examine the intensity decays of a fluorescent donor attached to an acceptor via a flexible alkyl chain. The intensity decay of the indole donor becomes markedly heterogenous due to energy transfer to the densyl acceptor. The measured dispersion of fluroscence decay times was used to recover the donor-to-acceptor distance distribution. The distance distribution was found to be characteristic of the molecule, and not the model used for data analysis. The ability to recover distance distributions in solution should be valuable in studies of biological macromolecules.     

Electron correlation described by extended geminal models: The EXGEM2 and EXGEM3 models

The general extended geminal model is reviewed and two new approximate models EXGEM 2 and EXGEM 3 are introduced. In a test calculation on water using a double-zeta basis set, the approximate models recover 93.4% of the full CI correlation energy defined within the same basis set. A test calculation on the neon atom demonstrates that the performance of the models in comparison with the full CI , will improve as the basis set is increased. It is suggested that for basis sets of moderate and large size, and which include polarization functions, the extended geminal models are likely to recover 95%–97% of the correlation energy obtainable by the full CI .     

Study on the performance assessment of a novel hybrid heat pump system modified with dedicated mechanical sub-cooler for domestic heating applications

Journal of Thermal Analysis and Calorimetry - This article investigates the performance of a novel hybrid heat pump system, which is developed to recover the waste heat from the flue gas of...     

KMgF3 及KMgF3∶Eu2+晶体的射线辐照效应

KMgF3∶Eu晶体中Eu3+→Eu2+的转换率在低浓度掺杂时接近100%, 完全转换的饱和掺杂摩尔分数为0.29%. 实验条件下, KMgF3晶体的X射线1 h辐照损伤可在约100 h后恢复; KMgF3∶Eu2+晶体经X射线辐照后, 360 nm锐峰发射强度略有降低. 不同剂量的γ射线辐照, KMgF3晶体热释光曲线的各个温度峰强度变化明显不同, 即使小剂量辐照, 造成的损伤也较难恢复, 如γ射线辐照剂量为103 Gy时, 辐照损伤的恢复时间约需30 d. KMgF3∶Eu2+晶体360 nm锐峰发射强度随γ射线辐照剂量增大而呈线性降低.     

On‐line separation of bacterial cells by carbon‐electrode dielectrophoresis

Dielectrophoresis (DEP) represents a powerful approach to manipulate and study living cells. Hitherto, several approaches have used 2‐D DEP chips. With the aim to increase sample volume, in this study we used a 3‐D carbon‐electrode DEP chip to trap and release bacterial cells. A continuous flow was used to plug an Escherichia coli cell suspension first, to retain cells by positive DEP, and thereafter to recover them by washing with peptone water washing solution. This approach allows one not only to analyze DEP behavior of living cells within the chip, but also to further recover fractions containing DEP‐trapped cells. Bacterial concentration and flow rate appeared as critical parameters influencing the separation capacity of the chip. Evidence is presented demonstrating that the setup developed in this study can be used to separate different types of bacterial cells.     

Ferromagnetic micropallets for magnetic capture of single adherent cells

We present a magnetic micropallet array and demonstrate its capacity to recover specific, individual adherent cells from large populations and deliver them for downstream single cell analysis. A ferromagnetic photopolymer was formulated, characterized, and used to fabricate magnetic micropallets, which are microscale pedestals that provide demarcated cell growth surfaces with preservation of biophysical properties including photopatternability, biocompatibility, and optical clarity. Each micropallet holds a single adherent cell in culture, and hundreds of thousands of micropallets comprise a single micropallet array. Any micropallet in the array can be recovered on demand, carrying the adhered cell with it. We used this platform to recover selectively single cells, which were subsequently analyzed using single-cell RT-qPCR.     

Effective recovery by KCl precipitation of highly diluted muscle proteins solubilized with sodium dodecyl sulfate.

A new, improved method is described, which takes advantage of the low solubility of potassium dodecyl sulfate (KDS), to concentrate sodium dodecyl sulfate-solubilized proteins from nanomolar solutions by KDS precipitation. The method was applied to proteins differing in Mr and pI. The effect of varying KCl, and the pH and/or concentration of the buffer on KDS-protein precipitation was studied. These parameters may be chosen to allow selective repartition of specific proteins in the pellet or supernatant. After precipitation, the hundred- or thousand-fold concentrated solutes are easily resuspended in small volumes of any required medium. Though initially experimented to recover muscle proteins from effluents of electroendosmotic preparative gel electrophoresis, the method proved to be of general interest as a powerful tool to recover proteins from highly diluted solutions.     

Recovery of molybdenum by solvent extraction from simulated high level liquid waste

Journal of Radioanalytical and Nuclear Chemistry - In this study, simple and a rapid solvent extraction method is investigated to recover Mo(VI) from simulated HLLW. The (NH4)6Mo7O24·4H2O...     

Reaction-controlled recovery of the copper(II) methanesulfonate catalyst for esterification

Summary Copper methanesulfonate is used as homogeneous-heterogeneous catalyst in the esterification of carboxylic acids with alcohols. Compared with conventional Lewis acids catalysts, it is easy to recover, and its activity and reusability are excellent.