Assessment of the Drafting Quality of Request Forms Submitted to the Malaria and Parasitology Units at the Institut Pasteur de Cote d’Ivoire

Biological tests provide information on the medical analysis requested by both the patient and the prescriber. It is a communication link between the prescriber and the laboratory staff. The lack of some information on request forms not only affects the drafting quality of the test and patient care, but could also make thousands of data produced by healthcare centers unusable. The aim of this study was to assess the drafting quality of request forms submitted to the Malaria and Parasitology Units at the Institut Pasteur de Côte d’Ivoire. Methods: It was a descriptive cross-sectional study to assess the drafting quality of request forms of various prescribers received at the Institut Pasteur de Côte d’Ivoire. This study was conducted at the Malaria and Parasitology Units, department of Parasitology and Mycology (Institut Pasteur de Côte d’Ivoire), from 6th December 2020 to 6th December 2021. The information on each request forms was recorded on a data collection form designed for this purpose. Each data collection form corresponds to a request forms and each test to a patient. Results: Out of a total of 1990 request forms received, the patient’s age and sex were missing on 18% and 26.8% of the tests respectively. More than half (51.80%) of request forms did not indicate the patient’s place of residence. Clinical information was not provided on 45.90% of the tests. Prescribers omitting their signatures were 51%, stamps were 50.3% and contacts were 71.2%. Only 5.4% of request forms were of good drafting quality. Providing all the required information on the forms could facilitate the use and analysis of data and samples.

Effect of geometrical parameters on forming quality of high-strength TA18 titanium alloy tube in numerical control bending

The forming quality of high-strength TA18 titanium alloy tube during numerical control bending in changing bending angle β, relative bending radius R/D and tube sizes such as diameter D and wall thickness t was clarified by finite element simulation. The results show that the distribution of wall thickness change ratio Δt and cross section deformation ratio ΔD are very similar under different β; the Δt and ΔD decrease with the increase of R/D, and to obtain the qualified bent tube, the R/D must be greater than 2.0; the wall thinning ratio Δto slightly increases with larger D and t, while the wall thickening ratio Δti and ΔD increase with the larger D and smaller t; the Δto and ΔD firstly decrease and then increase, while the Δti increases, for the same D/t with the increase of D and t.

Analysis and Optimization on Factors Affecting Forming Quality of Half Axle Gears Warm Precision Forging

Half axle gears is produced by precision forging popularly because of the advantages in minimum machining allowances, lower material consumption and good service properties. But the forming quality of precision forging is difficult to control. Many simulations and analysis of precision forging process were taken by previous researchers. But no concrete method is proposed to evaluate and optimize the forming quality of half axel gears. The primary purpose of this work is improving the forming quality of half axel gears by analyzing and optimizing the affected factors of forming quality. The enclosed-die warm forging process of half axle gears was developed, and a new type of die-set used on double action hydraulic press was brought forward. The main influential factors of precision forming quality were analyzed after the forming process had been simulated by using finite element method（FEM）. These factors include die structure, web thickness and web position. A method used to evaluate the forming quality was established, which investigated the maximal forming load, the metal filling rate and the material damage factor. The FEM simulations of half axle gears precision forging were evaluated by this method. The results show that the best forming quality can be achieved when the punches were added with bosses, the web located at the middle plant of the gear, and the web thickness was 30 percent of the inner hole diameter. Verification experiments taking the above optimized parameters were performed on a 7.8 MN double action hydraulic press. The trial products were formed well. And their geometric precision meets the demand. The verification result shows that the optimization of the influential factors, according to the simulations and the evaluation method, can improve the forming quality. The new structure of precision forging die-set and the new evaluation method guarantee a high forming quality ofhalfaxel gears.

Studies on Twin Micro-Watersheds, Melekote and Rajagatta Dodballapur Taluk, Bangalore Rural District, Karnataka State through Morphometry, Land Formation and Water Quality

The paper discusses assessment of various chemical constituents present in groundwater besides morphology, and land form characteristics of twin micro-watersheds (viz., Melekote and Rajaghatta) Dodballapur Taluk, (Karnataka) coming under semi-arid climatic zone. Farmers who are mainly depending on agricultural yields for their living are disappointed due to vagaries of monsoons and undependable rainfall. This is particularly so in arid and semi-arid regions. These regions suffer from water scarcity, soil degradation, low crop yield, high soil erosion and gradual depletion of soil fertility. All these factors culminate in planning for conservation and storage of water in small watersheds for future needs, i.e., during drought conditions. In many areas, it is observed that the water table levels are declining resulting in problems of increased concentration of solutes and deterioration of groundwater quality. All aspects of hydrological studies are covered in relation to watershed management in order to formulate strategies for sustainable agricultural development. Morphometry, landform and topography play an important role in understanding the hydrological response of any watershed. Quantitative morphometric analysis has been carried out on the watershed along with landform and topographical study.

Hybrid Micro-forming Processes and Quality Evaluation of Micro-double Gear

Micro-gear is an important actuating component used widely in the micro electro mechanical systems(MEMS) devices.The technologies of micro-forming and precision assembly are urgently developed to manufacture the micro-double gear with central shaft.In the paper,a novel hy-brid-forming process with two kinds of piercing method have been proposed to manufacture the micro-double gear using micro forming technology.The tests of hybrid forming process were carried out with two steps and the micro-double gear was successfully manufactured with good surface quality.The results also show that the hybrid micro-forming process with central piercing method can improve the defects of inclining shaft generated by double-ended piercing method.The quality evaluation of micro-double gear was conducted with surface roughness,micro-hardness and impact tests.The results show that the micro-double gear with good mechanical properties can meet the requirements of application for milli-machines.

Approach Based on Response-Surface Method to Optimize Lining of Dies Used in 3D Free-Bending Forming Technology

In three-dimensional free-bending forming(3D-FBF),the tube is not overly constrained,and the plastic deformation behavior and forming quality of the bent tube are significantly affected by the critical structure of the forming die lining.However,the effects of die-lining structural parameters on the tube quality,and a method to determine the combination of die-lining structural parameters is yet to be devised.This study aims to propose a new framework that allows one to understand the effects of various die-lining structural parameters on tube quality and to propose the best combination of die-lining structural parameters.First,finite-element modeling is performed to simulate 3D-FBF and examine the effects of individual die-lining structures on the quality of tube formation.The simulation results show that the deformation-zone length and die gap are positively correlated with the tube-section distortion and wall-thickness variation,whereas it shows an opposite trend with respect to the bending radius.Additionally,the lining chamfer radius of the bending die and the guide lining chamfer radius minimally affect the tube forming quality.Subsequently,the optimal die-lining structure is obtained using the response-surface method.The tube cross-sectional distortion rate reduced from 2.73 to 2.53%after the die lining is optimized.Additionally,the average inner-wall thickness reduced to 1.06 mm,whereas the average outer-wall thickness increased to 0.97 mm.This paper proposes a method for optimizing the forming-die-lining mechanism and for improving the tube forming quality in 3D-FBF.

An improved wind quality control for the China-France Oceanography Satellite (CFOSAT) scatterometer

Quality control(QC)is an essential procedure in scatterometer wind retrieval,which is used to distinguish good-quality data from poor-quality wind vector cells(WVCs)for the sake of wind applications.The current wind processor of the China-France Oceanography Satellite(CFOSAT)scatterometer(CSCAT)adopts a maximum likelihood estimator(MLE)-based QC method to filter WVCs affected by geophysical noise,such as rainfall and wind variability.As the first Ku-band rotating fan-beam scatterometer,CSCAT can acquire up to 16 observations over a single WVC,giving abundant information with diverse incidence/azimuth angles,as such its MLE statistical characteristics may be different from the previous scatterometers.In this study,several QC indicators,including MLE,its spatially averaged value(MLE_(m)),and the singularity exponents(SE),are analyzed using the collocated Global Precipitation Mission rainfall data as well as buoy data,to compare their sensitivity to rainfall and wind quality.The results show that wind error characteristics of CSCAT under different QC methods are similar to those of other Ku-band scatterometers,i.e.,SE is more suitable than other parameters for the wind QC at outer-swath and nadir regions,while MLE_(m) is the best QC indicator for the sweet region WVCs.Specifically,SE is much more favorable than others at high wind speeds.By combining different indicators,an improved QC method is developed for CSCAT.The validation with the collocated buoy data shows that it accepts more WVCs,and in turn,improves the quality control of CSCAT wind data.

The Correlation between the Power Quality Indicators and Entropy Production Characteristics of Wind Power+Energy Storage Systems

Power quality improvements help guide and solve the problems of inefficient energy production and unstable power output in wind power systems.The purpose of this paper is mainly to explore the influence of different energy storage batteries on various power quality indicators by adding different energy storage devices to the simulated wind power system,and to explore the correlation between systementropy generation and various indicators,so as to provide a theoretical basis for directly improving power quality by reducing loss.A steady-state experiment was performed by replacing the wind wheel with an electric motor,and the output power qualities of the wind power systemwith andwithout energy storagewere compared and analyzed.Moreover,the improvement effect of different energy storage devices on various indicatorswas obtained.Then,based on the entropy theory,the loss of the internal components of the wind power system generator is simulated and explored by Ansys software.Through the analysis of power quality evaluation indicators,such as current harmonic distortion rate,frequency deviation rate,and voltage fluctuation,the correlation between entropy production and each evaluation indicator was explored to investigate effective methods to improve power quality by reducing entropy production.The results showed that the current harmonic distortion rate,voltage fluctuation,voltage deviation,and system entropy production are positively correlated in the tests and that the power factor is negatively correlated with system entropy production.In the frequency range,the frequency deviationwas not significantly correlated with the systementropy production.

Evaluation of Productivity and Light Quality in Two High Density Dwarf Rootstock Apple Orchards in Central China

[Ohjective] The aim of the study is to investigate the productivity and light quality in two high density M26 dwarf rootstock apple orchards in central China so as to provide some management guidance for close planting of dwarf rootstock apples.[Method] The technical parameters of individual trees and group parameters as shoot number and composition and canopy coverage were determined, and the light quality in the canopy, fruit production and quality were investigated. [Result] Slender spindle （SS） orchard has 54 thousands shoots per 667 m^2. Coverage rate is 76%. Leaf area index is 1.9. The ratio of long, medium and spur shoots is 1：1：8. Fruit yield is 3 263 kg/667 m^2 with 85% first grade fruit. Light interception in the canopy is 58% while the ratio of canopy with good light is 65%. Modified slender spindle （MSS） orchard has 93 thousands shoots per 667 m^2 and the coverage is 77%. Leaf area index is 3.3. The ratio cf long, medium and spur shoots is 1：2：7. Fruit yield is 3 931 kg/667 m^2 with 85% first grade fruit. The light interception in the canopy is 73% while the ratio of canopy with good light is 35%. [Conclusion] Apple orchard with M26 dwarf rootstock trained as SS and MSS tree form in medium planting density may be useful to the management of the similar orchards in Central China.

基于Dynaform的微型轴承浪形保持架冲压成形工序仿真分析

针对微型轴承浪形保持架成形的不确定性,工件的内径检测困难,成形件的质量不易控制的问题,采用板料成形数值仿真软件Dynaform对浪形保持架的成形过程进行模拟仿真和优化,分析工艺参数和模具结构参数对成形件质量的影响,为浪形保持架加工工艺和质量控制提供一种新的方法。

基于原型网络的风电拉挤玻板质量异常识别

为了实现风电拉挤玻板生产过程可靠的质量异常识别,针对风电拉挤玻板生产过程中样本量少的问题,提出了一种融合了数据增强技术和原型网络的质量异常识别方法。首先,使用了Mixup数据增强方法,通过线性插值的方式增加样本数量,减少模型的过拟合现象;同时,结合不需要大量的数据来学习复杂特征表示的原型网络,建立异常识别模型,解决风电拉挤玻板质量异常识别中存在的小样本问题;最后,在某公司的仿真实验中,与SVM、LSSVM和MLP方法进行比较,结果表明此方法在小样本条件下显著提高了风电拉挤玻板过程质量异常识别准确率,实现了可靠的质量异常识别。

经二极管整流并网的构网型风机大扰动建模与稳定性分析

二极管整流单元型高压直流(DRU-HVDC)送出系统因其经济性优势,在新能源基地直流送出领域具有良好的应用前景。然而,在当前构网型换流器的大扰动稳定性研究中,大多由大容量同步机或大电网支撑故障点的频率和相位,且查表式设定故障电流参考值,缺乏对构网型风机接入DRU-HVDC系统这类故障点频率由换流器控制主导且动态调整故障电流参考值系统的研究。为解决上述问题,首先,建立计及电流限幅和频率控制的高阶非线性微分方程模型;然后,推导故障后系统平衡点的解析表达式,并论证采用q轴优先的电流限幅策略和频率控制在保障大扰动后平衡点存在性方面的优势;最后,基于Takagi-Sugeno法构建Lyapunov函数并得到系统的估计吸引域,分析换流器关键控制参数对暂态稳定性的影响,并与PSCAD/EMTDC中仿真算例进行对比,以验证暂态稳定性分析的准确性。

基于并联涉网变流器的电能质量协同控制策略

基于涉网变流器开展电能质量问题治理可以有效利用变流器的剩余容量,提高治理效益,但其往往只考虑跟网型(grid-following,GFL)控制,未能充分发挥多种类变流器的调控潜力。文中基于GFL和构网型(grid-forming,GFM)涉网变流器并联系统,提出谐波补偿、电压跌落抑制等协同控制策略。首先,介绍涉网变流器的基本控制原理及数学模型。其次,针对并联系统公共耦合点(point of common coupling,PCC)的谐波补偿问题,提出谐波分次补偿方法,增强谐波补偿的灵活性,实现谐波电流在不同容量变流单元间的合理分摊。针对PCC电压跌落问题,将并联系统状态总结为正常运行、仅GFL变流单元参与电压支撑、GFL和GFM变流单元共同支撑3种工况。经补偿容量计算和无功功率分配,PCC电压可始终保持在额定电压附近。最后,通过仿真验证所提策略的可行性与优越性。

构网型与跟网型混合直驱风电场并网稳定域分析

传统跟网型(GFL)风机并入弱交流电网时存在小信号失稳风险,而构网型(GFM)机组可在一定程度上提升系统的稳定裕度,这将促使未来出现构网型风机与跟网型风机混合的风电场。然而,跟网型与构网型风机的占比不同时,混合风电场的稳定域如何变化值得深入探索。首先,文中建立了跟网型与构网型混合直驱风电场并网系统的详细数学模型,提出了综合考虑稳态运行约束条件和小信号稳定性约束条件的系统并网稳定域计算方法,定量评估了混合直驱风电场在多维约束下的并网稳定运行域。然后,得到了特定风电场出力下混合直驱风电场在不同GFM风机占比时的电网短路比(SCR)可行范围,并进一步探究了风电场出力及风机至公共连接点(PCC)集电线路长度变化时,混合直驱风电场并网稳定域的变化趋势。最后,通过PSCAD/EMTDC下的电磁暂态仿真,验证了所得混合直驱风电场并网稳定域的准确性。

不同贮藏风速下冬桃果实品质变化规律研究

为研究不同贮藏风速下冬桃果实品质的变化规律,量化风速对冬桃品质的影响,以冬桃为试验材料,研究不同风速(自然对流、0.5、1.0、1.5 m/s)下贮藏期间冬桃含水率、失重率、硬度、呼吸强度、乙烯释放量、可溶性固形物含量、可滴定酸含量和色差等指标的变化。结果表明:与自然对流相比,贮藏风速为1.0 m/s时更有利于保持冬桃果实的贮藏品质,贮藏24 d时,冬桃果实含水率为85.6%、硬度为6.79 N、可滴定酸含量为0.61%,并在降低果实呼吸强度的同时,将呼吸跃变发生的时间推迟了3 d,保持了冬桃的口感和品质。研究明确了冬桃果实在不同贮藏风速下的采后生理变化规律,为冬桃果实贮藏保鲜和品质研究提供了参考依据。

Print Form^(TM) HR成形网的编织设计与应用

介绍了Voith公司新近开发的Print FormTM HR成形网的设计理念,叙述了在成形网性能指标的诸多要求中,采用综合折中的设计方法,实现成形网性能的最佳化。同时,也介绍了Print FormTM HR成形网在世界各国造纸企业中的应用实例。

EXPERIMENTAL RESEARCH AND NUMERICAL SIMULATION OF LASER SHOCK FORMING OF TA2 TITANIUM SHEET

Laser shock forming （ISF） was a new technique realized by applying an impulsive pressure generated by laser-induced shock wave on the surface of metal sheet. LSF of metal sheet was investigated with experiments and numerical simulation. The basic theories were introduced; the surface quality and deformation of the processed titanium sample （TA2） were examined; ABAQUS was used to simulate ISF and the central displacement of the shocked region was measured and compared with the simulation. Overlapped ISF treatment was experimentally carried out to produce groove and simulation. The results showed that the surface quality and the microstructure with single laser pulse had no remarkable change, and ablation was observed on the surface of the sample with overlapped pulses. The deformation observed in the numerical simulation agreeed with that observed in the experimental measurement quite well.

KDF-M成型机滤棒圆周CPK值优化研究

在滤棒生产过程中,提高圆周过程能力指数(CPK值)是保证滤棒质量有效的方法之一。该文为提高KDF-M成型机滤棒圆周过程质量控制能力,针对影响滤棒圆周稳定性的部位进行改进。通过加装纸边辅助调节器,使纸边平稳运行从而保障圆周稳定;通过降低鱼雷辊故障频率优化其支撑位置,减少圆周波动;通过改进压板定位螺丝,减少压板位移造成圆周不稳;设计光学直径检测装置(ODM)专用清洁工具,能快速彻底清除积垢提高圆周检测的准确性。结果表明,通过以上改进方法成功提升滤棒圆周CPK值,从而保证卷烟质量。

Quality Control on Crimping of Large Diameter Welding Pipe

Crimping is used in production of large diameter submerged-arc welding pipes. Many researches are focused on crimping in certain manufacturing mode of welding pipe. The application scopes of research achievements become limited due to lack of uniformity in theoretical analysis. In order to propose a crimping prediction method in order to control forming quality, the theory model of crimping based on elastic-plastic mechanics is established. The main technical parameters are determined by theoretical analysis, including length of crimping, base radius of punch, terminal angle of punch, base radius of die, terminal angle of die and horizontal distance between punch and die. In addition, a method used to evaluate the forming quality is presented, which investigates the bending angle after springback, forming force, straight edge length and equivalent radius of curvature. In order to investigate the effects of technical parameters on forming quality, a two-dimensional finite element model is established by finite element software ABAQUS. The finite element model is verified in that its shapes error is less than 5% by comparable experiments, which shows that their geometric precision meets demand. The crimping characteristics is obtained, such as the distribution of stress and strain and the changes of forming force, and the relation curves of technical parameters on forming quality are given by simulation analysis. The sensitivity analysis indicates that the effects of length of crimping, technical parameters of punch on forming quality are significant. In particular, the data from simulation analysis are regressed by response surface method （RSM） to establish prediction model. The feasible technical parameters are obtained from the prediction model. This method presented provides a new thought used to design technical parameters of crimping forming and makes a basis for improving crimping forming quality.

Improved form of wind wave frequency spectrum

The lower frequency part of the theoretical wind wave spectrum proposed by the authors (Wen et al. , 1988a, b,c) has been improved and the form of spectrum is appreciably simplified. In addition to the field data collected in the Bohai Sea region and used in the previous papers, those obtained in the Huanghai Sea, the East China Sea and the South China Sea have been employed so that the improved spectra can be verified on a more extensive observational basis. Computed results agree with the observations well. Further comparisons have been made between the proposed spectra and the JONSWAP spectrum. Though the two types of spectrum are close to each other in form, the former shows, as a whole, better agreement with the observation than the latter. By introducing an improved relation between the peak-ness factor and significant wave steepness, the spectrum contains only significant wave height and period as parameters. For spectra given in this form, the computed peak frequencies coincide approximately with observed values and the computed peak magnitudes of spectra agree basically with observations, but, because of the statistic variability inherent in the measurements of significant wave heights and periods, there are certain discrepancies between computed and measured spectrum peak magnitudes.