AD—50大孔吸附树脂对紫叶小檗叶红色素提取性能的研究

研究了AD— 5 0大孔吸附树脂提取精制紫叶小檗叶红色素的最佳条件。结果表明 :AD— 5 0树脂在 5 0℃、吸附液pH3- 4时对紫叶小檗叶红色素的吸附能力较强 ,以 95 %乙醇作为解吸剂 ,2

基于高性能特征提取和任务解耦的无人机航拍图像小目标检测

无人机广泛应用于环境监测、资源规划和电力巡检等多种领域,其航拍图像中存在大量小尺寸目标,给目标检测任务带来难度。为此,在YOLOv5s的基础上提出一种基于高性能特征提取和任务解耦的目标检测网络(HFTT-Net)算法。首先,针对航拍图像中小尺寸目标特征提取困难的问题,在原始骨干网络的基础上引入多头自注意力机制,使网络充分关注小目标信息,在多尺度特征融合过程中使用SPD(Space-to-depth)组件,增强待检测目标的特征;接着,对于目标检测中普遍存在的任务冲突的问题,将分类头与回归头进行解耦操作,进一步提升目标检测精度;最后,结合基于EIoU的回归损失对网络进行监督,提升网络收敛速度,实现无人机航拍图像中目标的精确检测。在VisDrone2019数据集上的实验结果表明,HFTT-Net中的高性能特征提取和任务解耦操作能够充分提升网络的小目标检测能力,在航拍图像的多密集小目标场景任务中表现突出,该算法在能够满足实时检测的情况下与经典的YOLOv5s算法相比精度提升了2.5%。

基于多重映射的自动中文短文摘提取方法

中文短文摘提取时受其字数限制,难以获得均衡的提取性能。针对该问题,本文提出了一种基于多重映射的自动短文摘提取方法。

迭代接收机性能建模方法研究进展

针对迭代接收机的性能建模方法,从等效模型、传递参数、性能提取及传递关系等4个方面概述了研究成果,并归纳了各自特点及发展趋势。服从高斯分布的对数似然比信息等效模型是迭代接收机性能建模研究的基础,以互信息为传递参数并通过仿真获得互信息传递关系图,以误比特率或保真度为传递参数的半公式化传递关系及以互信息为传递参数的半公式化传递关系分别是性能分析、性能优化及链路联合设计等3种应用场景下性能建模的代表性方法,是迭代接收机性能建模研究的发展方向。

基于语义的中文文本关键词提取算法

为克服传统关键词提取算法局限于字面匹配、缺乏语义理解的缺点,提出一种基于语义的中文文本关键词提取(SKE)算法。将词语语义特征融入关键词提取过程中,构建词语语义相似度网络并利用居间度密度度量词语语义关键度。实验结果表明,与基于统计特征的关键词提取算法相比,SKE算法提取的关键词能体现文档的主题,更符合人们的感知逻辑,且算法性能较优。

基于病灶格子图的嵌入编码数字隐写系统

针对数字图像隐写中常见的LSB替换隐写算法的不足,设计并实现一种基于病灶格子图编码(STC)算法的数字隐写系统,该系统对STC编码算法进行了改进,给出了隐藏秘密消息比特数的传递方法,优化了其自适应性,解决了秘密消息的长度共享问题,改进了传输过程中STC码的抗提取性能,从而提高了隐写系统的安全性。

红子果中色素的提取及其性能分析

红子果中色素为火棘红色素，主要成分为矢车菊-3-葡萄糖苷等水溶性花色苷类色素类，属于类黄酮化合物。类黄酮色素具有2-苯基苯并吡喃和2-苯基苯并吡喃酮的结构。具有2-苯基苯并吡喃结构的也称为花青素类色素，为花色素的基元，2-苯基苯并吡喃酮也称花黄素类。本文就红子果中色素的提取及其性能分析，如光学性质、酸碱性、热稳定性、食品添加剂影响等方面来进行探讨。

PST控制器车载实时监测系统开发中关键问题研究

针对汽车电动脚踏板(PST)控制器设计一种基于LabVIEW的车载实时监测系统,解决了高速数据采集机制的选择、高速存储以及关键性能参数的提取等问题,通过长时间的车载监测结果验证了系统的稳定性和高效性。

A Multi-model Approach for Soft Sensor Development Based on Feature Extraction Using Weighted Kernel Fisher Criterion

Multi-model approach can significantly improve the prediction performance of soft sensors in the process with multiple operational conditions.However,traditional clustering algorithms may result in overlapping phenomenon in subclasses,so that edge classes and outliers cannot be effectively dealt with and the modeling result is not satisfactory.In order to solve these problems,a new feature extraction method based on weighted kernel Fisher criterion is presented to improve the clustering accuracy,in which feature mapping is adopted to bring the edge classes and outliers closer to other normal subclasses.Furthermore,the classified data are used to develop a multiple model based on support vector machine.The proposed method is applied to a bisphenol A production process for prediction of the quality index.The simulation results demonstrate its ability in improving the data classification and the prediction performance of the soft sensor.

Synthesis and extractive properties of bisthiophosphorylimines

Novel transition metal complexes of bis(diarylsubstitutedthiophosphoryl)imines ligand derived from O,O-di(p-methoxylphenyl)thiophosphoryl chloride and O,O-di-(p-methoxylphenyl)thiophosphoryl amine with Cu(Ⅱ ),Co( Ⅱ) ,Ni( Ⅱ) ,Fe(Ⅱ ) and Mn( Ⅱ ) were synthesized. The formation mechanism of complexes and their stereochemistry structures were investigated according to elemental analysis,infrared spectra and 31P-nuclear magnetic resonance spectra. The extractions of the ligand for different divalent metal ions,such as Zn(Ⅱ ),Cd( Ⅱ) ,Cu( Ⅱ) ,Ni( Ⅱ ),Fe( Ⅱ) ,Sn( Ⅱ) ,Mn( Ⅱ) ,Pd( Ⅱ) ,Hg( Ⅱ) and Fe(Ⅲ),were investigated in sulphate solution,respectively. The results show the metal atom is coordinated by 4 sulfur atoms in a square-planar fashion,and the titled compound has not only powerful ability to coordinate with cadmium from aqueous solution with a high extractive rate about 61.20% and a relatively weak complexation for other divalent metals with the extractive rate from 2.46% to 36.66%,but also a good selectivity to Fe(Ⅲ ).

Robust Blind Separation for MIMO Systems against Channel Mismatch Using Second-Order Cone Programming

To improve the deteriorated capacity gain and source recovery performance due to channel mismatch problem,this paper reports a research about blind separation method against channel mismatch in multiple-input multiple-output(MIMO) systems.The channel mismatch problem can be described as a channel with bounded fluctuant errors due to channel distortion or channel estimation errors.The problem of blind signal separation/extraction with channel mismatch is formulated as a cost function of blind source separation(BSS) subject to the second-order cone constraint,which can be called as second-order cone programing optimization problem.Then the resulting cost function is solved by approximate negentropy maximization using quasi-Newton iterative methods for blind separation/extraction source signals.Theoretical analysis demonstrates that the proposed algorithm has low computational complexity and improved performance advantages.Simulation results verify that the capacity gain and bit error rate(BER) performance of the proposed blind separation method is superior to those of the existing methods in MIMO systems with channel mismatch problem.

Optimization of Yield and Chemical Properties of Agar Extracted from Melanothamnus Somalensis from Oman Sea

The red seaweed Melanothamnus somalensis was investigated as potential economic source of agar. The effect of different conditions of alkali pre-treatment on chemical properties of agar was evaluated. Agar was extracted by various concentrations of NaOH （4%, 6% and 8%） and heated at different temperatures （70 ℃, 75 ℃ and 80 ℃） for different durations （2 h, 2.75 h and 3.5 h）. The yields-molecular weight （Mw） and sulfate contents of extracted agar were analysed and characterized by FTIR spectroscopy. The yield was significantly increased at these treatments from 23.29% to 30.86%. Mw studied by HPLC ranged from （.12.45 ± 0.21） × 10^5 to （8.60 ± 2.40） × 10^5 Da. FTIR bands show sulfate groups in C4 and C6 ofgalactose and no sulfate group were found on both C2 of galactose and C2 of 3,6-anhydrogalactose. All treatments showed a high sulfate content that ranged from 5.4% to 10.1%. These properties were found to be significantly affected by the alkali pre-treatment concentration （p 〈 0.05）. In conclusion, agar extracted in this study was considered acceptable for industrial application and the optimal conditions for extraction were found to be at 6% NaOH at 70 ℃ for 2 hours.

Structure characteristics and adhesive property of humic substances extracted with different methods

The structure characteristics and adhesive property of humic substance(HS) extracted with different methods were mainly studied by terms of elementary analysis,visible spectrum,FT-IR spectroscopy,viscosity,adsorption and pelletizing experiments.The results show that HSs extracted with new method(HS-a) own higher degree of aromatization and polymerization,larger relative molecular mass and more polar functional groups than HS extracted with usual method(HS-b).The viscosity of HS-b is about 30-40 mPa·s lower than that of HS-a.The maximum adsorption amounts of HS-a and HS-b onto iron concentrates are 9.11 mg/g and 8.08 mg/g,respectively.Meanwhile,HS-a has a better performance than HS-b in the practical application for pelletizing of iron concentrates.The difference in agglomeration behaviors with iron concentrates lies in the differences of the structure characteristics of HSs.With higher content of polar functional groups,larger relative molecular mass and viscosity of HSs,the agglomeration behavior is improved.

Determinations of Antimicrobial Properties of Ginger, Galangal and Hoan-Ngoc Crude Extracts on Campylobacter spp.

The study aimed at investigating the antimicrobial properties of 3 crude extracts from Thai medicinal plants namely, ginger, galangal, hoan ngoc and their combinations towards Campylobacter species isolated from chicken cut samples in Khon Kaen province, Thailand. 25 Campylobacter isolates were used for determining the antimicrobial properties i.e. minimum inhibitory concentration （MIC） and minimum bactericidal concentration （MBC） of the 3 herbs and theirs combinations. MIC values among the 7 experimental groups i.e. ginger, galabgal, hoan ngoc, ginger-galangal, galangal-hoan ngoc, ginger-hoan ngoc, ginger-galangal-hoan ngoc were in the range between （minimum-maximum） 0.078%-5%, 0.078%- 〉 5%, 0.156%- 〉 5%, 0.039%-0.625%, 0.0097%-0.315%, 0.156%-0.3125% and 0.0048%-0.625%, respectively. The combinations of three herbs （ginger-galangal-hoan ngoc） provided the lowest MIC of 0.0048% comparing with other experimental groups. In addition, median of MBC values were in the range of 2.5%, 2.5%, 〉 5.5%, 0.625%, 2.5% and 0.625%, respectively. The combination between galangal-hoan ngoc and ginger-hoan ngoc were synergistic. The low concentration level of herbs for the bactericidal effect was therefore in the modest range but provided high potency towards Campylobacter spp. compared with the other regimes of herbs.

The influence of Fe extracting as a filler of fiber concrete performance

This research is showing the effect of increasing an Fe extracting from the compression strength, tension and bending moment. The variations in this experiment are the increasing of Fe extracting 0.5%, 1% and 1.5% of concrete volume. Water Cement Ratio （WCR） variation of 0.48, 0.56 and 0.60. The result of increasing 1.5% Fe extracting causes the increasing of tension strength 44.028 kN/cm2, the increasing of slit tension strength 2.226 kN/cm2, the increasing of bending moment 14.81 kN/cm2 from normal concrete. 0.48 WCR produces tension strength, slit tension strength and bending moment more than 0.56 and 0.60 WCR. The increasing of Fe extracting with the distribution variation area and the spread concrete in the tension concrete area produce 3.705 kN/cm2 bending moment higher than the spread fiber in all of concrete area. The 4 cm fiber length produces the higher bending moment than the 2 cm fiber length. The difference is equally 5.185 kN/cm2. The combination result of the examined acting varieties by continuation statistic test gives the result to get the maximum tension and split tensile. It is a concrete combination of increasing 1.5% fiber percentage, 0.48 WCR, full spreading area and the 4 cm fiber length. The maximum bending moment is the increasing of 0.5% fiber percentage, 0.48 WCR, full spreading area and the 4 cm fiber length.

Investigation of Dyeing Properties of Different Fabric Species with Alkanna Orientalis Root Extract

In this study, the dyeing properties of different fabric species were investigated using root extract of yellow sormunen （Alkanna orientalis）. For this purpose, the cotton and wool fabrics were dyed using the root extract of yellow sormunen by pre-mordanting, together-mordanting and last-mordanting methods with copper sulfate （CuSO4）, iron sulfate （FeSO4） and aluminum sulfate （AiK（SO4）2） at medium pH. The same procedure was applied to cotton and wool fabrics that allowed in Artifical Urinary System （AUS） [%3 NH3 ＋ %3 urea ＋ %3 CAC2O4（g/v）] for 24 h. The color codes were determined with Pantone Color Quide, and K/S and L＊ a＊ b＊ values were detected with color measurement spectrophotometer, and also washing-, crocking-fastness levels were evaluated using gray scale. According to the evaluations, the fabrics dyed pre-treated with AUS have higher fastness values than the unpre-treated dyed fabrics with AUS.

Anti-inflammatory Activity and Antioxidant Potential of Aqueous Extracts from Stem Bark of Geoffroea decorticans

In the present work we investigated, for the first time, the anti-inflammatory activity and the antioxidant properties of aqueous and ethanolic extracts, obtained from stem bark of Geoffroea decorticans （Gill. ex Hook. et Am.） Burk. （Fabaceae）. G. decorticans, commonly known as ＂chafiar＂ or ＂chafiarcillo＂, is a traditional argentinean plant used as emollient, balsamic, antitussive, expectorant and anti-inflammatory. The stem bark was collected from San Francisco del Monte de Oro, San Luis, Argentina. Anti-inflammatory activity was evaluated by carrageenan-induced paw edema in rats. Antioxidant activity was tested using 1,1-Diphenyl-2-picrylhydrazyl radical-scavenging activity （DPPH）, 2,2＂-Azino-bis（3-ethylbenzthiazoline-6-sulphonic acid） radical scavenging activity （ABTS） and ferric ion-reducing power （RP-Fe） assays. Aqueous extract 10% p/v showed anti-inflammatory activity （3h, 48% inhibition, 5h 37% inhibition and 7h 17% inhibition） and antioxidant activity （DPPH, ICs0 （mg/mL） = 0.098 =1： 0.032; ABTS, ICs0 （mg/mL） = 0.022 ~ 0.343, RP-Fe IC50 （mg/mL） = 1.124 ~ 0.146）. In the other hand, the ethanolic extract 5% p/v, presented anti-inflammatory activity （3h, 34% inhibition, 5h 38% inhibition and 7h 35% inhibition） and antioxidant activity （DPPH, IC50 （mg/mL） = 0.133 q- 0.027; ABTS, IC50 （mg/mL） = 0.086 ＋ 0.262, RP-Fe IC50 （mg/mL） = 7.089 ± 0.104）. These results suggest that, also fruits, the aqueous and ethanolic extracts from the stem bark of G. decorticans present significant anti-inflammatory activity and antioxidant properties.

Bone Marrow Mononuclear Cell Extraction. Does the Operator Performance Affect Processing Efficacy？

Different cell populations from bone marrow are used in various clinical trials for cardiac diseases during last decade. Four clinical studies are on going in our institution and enrol patients with cardiac diseases, coronary disease and type 2 diabetes, patients with osteoarthritis. Density gradient is used to separate bone marrow mononuclear cells. Cell processing looses are significant. To find out critical control points we analysed processing process and differences in cell yields between operators performing cell extraction. Bone marrow mononuclear cells were isolated using Ficoll density gradient centrifugation. Cells were counted using flow cytometry for mononuclear cell total counts, CD34＋ population count and viability analysis. The patients who underwent bone marrow aspiration followed by cell isolation received cell suspension for transplantation. Two cells processing for separate patients were performed at once. Same standard operation procedures were applied. Processing looses between operators performing cell extraction were analysed. Bone marrow samples from eight patients were processed. Mononuclear cells were extracted. Operator performances were compared. Operator A average bone marrow mononuclear cell yield in starting material was 9,97 ± 9,98 %, CD34＋ population yield 75,46±79,67%. Operator B average bone marrow mononuclear cell yield in starting material was 24,68 ± 14,8 %, CD34＋ population yield 70,42 ±44.84%. Operator A average cell viability in starting material was 45,24 ± 9,55%, after cell processing 42,96 ± 23,66 %. Operator B average cell viability in starting material was 49,85 ± 5,48%, after cell processing 69,52 ± 6,65 %.

Effects of Mango Skin or Mango Skin Combined with Paprika Extracts on Production Performance, Egg Quality and Egg Yolk Polyphenols

The phenc, lic compounds found in mango fruit are antioxidants, and contribute to a reduction in the risk of cardiovascular diseases. Mango carotenoids are synthesized in mango fruit during ripening. A major by-product of mango fruit is the skin, which is available after the fruits is consumed or used, particularly in the preparation of jams and fruit juices by the fruit canning industry. The objective of this study was to investigate the effects of dietary mango skin （MS） or mango skin combined with paprika extracts （PE） on production performance, egg quality, and egg yolk polyphenols. Total of 60 44-week-old Boris Brown hens was assigned, based on egg production rate and body weight, to 6 groups （10 birds in each group）. The laying hens were fed a basal diet （control group, 18 CP, 2,800 kcal/kg ME）, a basal diet supplemented with 0.1% PE, 1% or 5% MS, or with a mixture of 0.1% PE with 1% or 5% MS respectively. During the three-week experimental feeding period, the birds had free access to feed and water. Feed consumption was measured weekly and egg production was recorded daily. The results for initial body weight, feed consumption, hen-day production, egg mass, mortality, and final body weight did not indicate any effects of the different treatments （P 〉 0.05）. There were no significant differences （P 〉 0.05） in shell-breaking strength, shell thickness, shell ratio, yolk ratio or Haugh units, except in the case of egg yolk color. Roche yolk color fan scores were better in all experimental groups than in the control （P 〈 0.0001）. The yolk color, yellow index, and ratio of redness to yellowness were greater （P 〈 0.0001） in the 0.1% PE, the 0.1% PE ＋ 1% MS, and the 0.1% PE ＋ 5% MS group than in the 1%, 5% MS, and control groups. Compared with the control, lightness was decreased significantly in the 0.1% PE, the 0.1% PE ＋ 1% MS, and the 0.1% PE ＋ 5% MS groups （P 〈 0.05）, whereas redness was increased significantly in the 0.1% PE, 0.1% PE ＋ 1% MS, and 0.1% PE ＋ 5% MS groups （P 〈 0.0001）. No significant differences among the treatments were observed in either yellowness or egg yolk polyphenols. The results of the present experiment indicate that dietary mango skin or mango skin combined with paprika extracts did not show adverse effects on production performance, egg quality or egg yolk polyphenols. Moreover, supplementation with only mango skin did not enhance egg yolk color.

Flavonoid Content and Antioxidant Properties in Different Extracts of Calluna vulgaris （L,） Flowers

This study evaluated the effect of four different solvent, i.e., water, ethanol, water-ethanol mixture and ethyl acetate, on the antioxidant activities of wild and cultivated heather （Calluna vulgaris （L.） Hull） plant. The highest values for total flavonoid content were obtained for samples extracted using ethanol-water mixture and ethyl acetate. Cupric reducing antioxidant capacity （CUPRAC） method, scavenging ability on 1,1-diphenyl-2-pirylhydrazyl radicals （DPPH） radicals and chelating activity on Fe2~ ions have been used for evaluation of antioxidant activity of the extracts. Ethanolic fraction exhibited the lowest reducing capacity, despite a heather sample used. The extracts of cultivated heather exhibited significant scavenging effect on DPPH radicals, and ethanol and ethanol-water fractions were found to be the most effective. The metal-chelating effect of the extracts increased in the order： ethanol 〈 ethyl acetate 〈 ethanol-water 〈 water. The results may be helpful for better utilization of heather flowers extracts as potential pharmaceutical and nutraceutical ingredient.