互联网时代下“食品安全与质量控制学”教学改革与探索

互联网技术的发展加速了教育行业的信息化进程。基于西南林业大学食品科学与工程专业的必修课程“食品安全与质量控制学”,剖析了教学过程中存在的问题,并针对普遍问题提出了应对策略,以期提高食品科学与工程专业的教学质量,培养出满足现阶段社会需求的新型人才。

改良案例教学法在《食品质量控制学》课堂教学中的应用研究

本文根据食品质量与安全专业特点,及未来就业要求,对专业基础课程《食品质量控制学》教学方法进行改革。在多年教学实践基础上,总结教师教学经验和学生学习情况,将改良型案例教学法——四步式案例教学法,运用在《食品质量控制学》教学中,激发学生学习兴趣,培养学生分析问题、解决问题的能力,提高课堂教学效果。

临床化学检验分析前质量控制的影响因素与对策

目的对临床中化学检验分析之前影响质量的因素进行探讨,对检验分析前质量的管理与控制的重要性进行重新认识,以建立一个检验分析前质量控制的科学管理体系。方法应用VFP6.0来建起气数据库的管理系统,对2009年8月至2011年3月期间我院进行化学检验当中的最常见问题采取统计分析,将样本合格率定为临床各部门的质控标准。结果样本延时送检、不规范采样、患者不按照规定准备及样本质量不合格是分析前质量的主要4个影响因素。结论临床中化学检验分析前的质量控制是确保检验结果及时准确的前提和保证全面质量的必需阶段,这需要患者、临床医护人员和检验人员的共同参与和努力。

混合式教学法在“食品质量与控制学”课程的应用及探讨

文章从教学设计、教学方法、教学效果评价以及应用情况分析等方面,阐述了线上线下混合式教学法在"食品质量与控制学"课程中的探索与实践,从线上课程资源优化、线下课堂内容优化和混合式教学方法优化三个方面提出了进一步改革的方向,为实现以学为中心的教学变革,提升教学质量,提供了一定的参考和建议。

食品质量与控制学混合式教学和课程思政有效融合的实践与探索

为了使课程思政更好地融入专业课教育,以食品质量与控制学为例,在剖析课程特点和内容的基础上,深度挖掘思政元素,使思政目标融入课程目标。进一步探索混合式教学模式下思政教学方法、课程评价的改革方式,设计出能够考查学生综合素质和能力的评价体系,实现思政教育与专业教育的有效集合,构建新的教学模式。该教学模式能够培养学生树立良好的人生观、价值观和职业道德,将立德树人的教育本质落到实处,实现知识目标、能力目标与德育目标的统一。

课程思政视域下“食品质量与安全控制学”课程教学改革探索

食品的质量安全关系到广大人民群众的生命和身体健康。因此,在思政视域下对食品专业课程教学提出了更高的新要求,既要用科学理论培养人,同时也要重视思政课的实践性,通过思政教学内容的选择与安排,把思政小课堂同社会大课堂结合起来,形成协同效应。既培养学生具备了食品专业人才的知识技能,也培养了其社会责任感与职业道德感。

Kinematic characterization and optimization of vehicle front-suspension design based on ADAMS

To improve the suspension performance and steering stability of light vehicles, we built a kinematic simulation model of a whole independent double-wishbone suspension system by using ADAMS software, created random excitations of the test platforms of respectively the left and the right wheels according to actual running conditions of a vehicle, and explored the changing patterns of the kinematic characteristic parameters in the process of suspension motion. The irrationality of the suspension guiding mechanism design was pointed out through simulation and analysis, and the existent problems of the guiding mechanism were optimized and calculated. The results show that all the front-wheel alignment parameters, including the camber, the toe, the caster and the inclination, only slightly change within corresponding allowable ranges in design before and after optimization. The optimization reduces the variation of the wheel-center distance from 47.01 mm to a change of 8.28 mm within the allowable range of ?10 mm to 10 mm, promising an improvement of the vehicle steering stability. The optimization also confines the front-wheel sideways slippage to a much smaller change of 2.23 mm; this helps to greatly reduce the wear of tires and assure the straight running stability of the vehicle.

Modeling and analysis of moving-mass actuated stratospheric airship

A moving-mass control method is introduced to stratospheric airship for its special working condition of low atmospheric density and low speed.The dynamic equation of airship is derived by using the Newton-Euler method and the mechanism of attitude control by moving masses is studied.Then the passive gliding of airship by the moving masses is given based on the theory of glider,and attitude control capability between moving mass and elevator is compared at different airspeed.Analysis results show that the motion of masses changes the gravity center of the airship system,which makes the inertia tensor and the gravity moment vary.Meanwhile,the aerodynamic angles are generated,which results in the change of aerodynamic moment.Control efficiency of moving masses is independent of airspeed.Thus the moving-mass control has the advantage over the aerodynamic surfaces at low airspeed.

A quality control method for high-resolution radiosonde temperature and wind data

This study proposes a method to derive the climatological limit thresholds that can be used in an operational/historical quality control procedure for Chinese high vertical resolution(5–10 m)radiosonde temperature and wind speed data.The whole atmosphere is divided into 64 vertical bins,and the profiles are constructed by the percentiles of the values in each vertical bin.Based on the percentile profiles(PPs),some objective criteria are developed to obtain the thresholds.Tibetan Plateau field data are used to validate the effectiveness of the method in the application of experimental data.The results show that the derived thresholds for 120 operational stations and 3 experimental stations are effective in detecting the gross errors,and those PPs can clearly and instantly illustrate the characteristics of a radiosonde variable and reveal the distribution of errors.

Quality Control and Translation Competence

The present work shows the results of a pilot methodology, designed after a series of observations and documented from 2006, on the process of acquisition of Translation Competence （TC） of students of translation. This method of analysis, appointed Previous Protocol to Translation or PPT, emerged as an option in search of teaching strategies of translation. This PPT has provided data not only on how novice translators acquire the translation competence, but it has been uncovered some independent variables that directly affect their development. There has been, in the four semesters analyzed in this work, a clear pattern that shows that an appropriate quality control to translate （and to carry out punctual terminology management） determines a better or worse quality of the final product （translations）; therefore, this reflects in a better translation competence in the novice students.

Advance in Studies on Chemical Constituents, Pharmacology and Quality Control of Aquilaria sinensis

Aquilaria sinensis(Thymelaeaceae)is widely cultivated in southern China for its significant medicinal usage.The resinous wood,the most used part of the plant as traditional Chinese medicine(TCM),locally called“Chen Xiang(沉香)”or Chinese agarwood,has been traditionally used for the treatment of circulatory disorders,abdominal pain,vomiting,and dyspnea.Till date,over 249 compounds have been isolated and identified from this plant.A range of bioactivities,including α-glucosidase inhibitory effects,anti-inflammatory,cytotoxicity,neuroprotective,anti-neuroinflammatory,antimicrobial and acetylcholinesterase inhibitory effects,along with some of the pharmacological mechanisms have been reported for the pure compounds or extracts of Aquilaria sinensis.For the purpose of quality control and clinical safety of drug usage,modern analytical instruments and chemical analysis methods have been applied for analyses of Aquilaria sinensis.In order to comprehensively understand the medicinal application and to fully utilize the plant,a literature search on the herb based on databases including SciFinder,Web of Science,Pubmed,Google Scholar and others was performed and the information regarding to the phytochemistry investigations,pharmacological studies and quality control was summarized in this paper.

Metabonomics/metabolomics analysis technology and its application in quality control of traditional Chinese medicines

Chinese medicines are an important part of traditional Chinese medicines,but their'safe,effective,stable and controllable'issue still remains to be solved.The rise of metabonomics in 20th century,consistent with the overall adjustment concept of multi-component,multi-level,multi-target,multi-metabolic pathways of traditional Chinese medicines,is conducive to solve basic problems in their quality control.This paper systematically describes recent application and development of 1H-NMR metabonomics techniques,LC-MS metabonomics techniques and GC-MS metabonomics techniques in the quality control of traditional Chinese medicines.It provides a new reference for Chinese medicines and the identification and quality assessment of their products.

EVALUATION OF GEOCHEMICAL QUALITY CONTROLIN DETERMINATION OF Mn IN SOILS USING A SEQUENTIAL CHEMICAL EXTRACTION

Sequential chemical extraction procedure has been widely used to partition particulate trace metals into various fractions and to describe the distribution and the statue of trace metals in geo environment. One sequential chemical extraction procedure was employed here to partition various fractions of Mn in soils. The experiment was designed with quality controlling concept in order to show sampling and analytical error. Experimental results obtained on duplicate analysis of all soil samples demonstrated that the precision was less than 10%(at 95%confidence level). The accuracy was estimated by comparing the accepted total concentration of Mn in standard reference materials (SRMs) with the measured sum of the individual fractions. The recovery of Mn from SRM1 and SRM2 was 94.1%and 98.4%, respectively. The detection limit, accuracy and precision of the sequential chemical extraction procedure were discussed in detailed. All the results suggest that the trueness of the analytical method is satisfactory.

Quality Control of ARGO Data Based on Climatological T-S Models

By implementing the ARGO program, a large number of T-S profiles can be observed in the world ocean. However, it is very difficult to examine changes of the sensitivity of the sensors equipped at the ARGO floats, because it is difficult to understand their condition in the sea and the reliability of the data. Quality control must be done in order to avoid the wrong conclusion deduced from the wrong data. One of the realistic methods for quality control of the ARGO data is the comparison with the local climatology. High quality climatological T-S models in northwest Pacific have been built based on the Nansen bottle data and CTD data for the quality control in NMDIS. The models are used to check the ARGO data in this area and have got good result.

Enhanced exergy cost optimization of operating conditions in FCCU main fractionator

Exergy indicates the maximal energy that can do work effectively. Different from optimization of product quality or calculation of generic energy conservation in most previous studies, the application of exergy analysis and exergy cost optimization in petrochemical industry is of great economic and environmental significance. Based on the main fractionator in Jiujiang Petrochemical Complex No. 2 FCCU, an enhanced exergy cost optimization under different operating conditions by adjusting set points of temperature and valves opening degree for flow control is studied in this paper in order to reduce exergy cost and improve the quality of energy. A steadystate optimization algorithm to enhance exergy availability and an objective function comprehensively considering exergy loss are proposed. On the basis of ensuring the quality of petroleum products, the economic benefits can be improved by optimizing the controllable variables due to the fact that exergy cost is decreased.

Chemical fingerprinting of Su-He-Xiang-Wan and attribution of major characteristic peaks for its quality control by GC-MS

A simple and facile gas chromatography-mass spectrometer （GC-MS） fingerprint of Su-He-Xiang-Wan （SHXW） was developed, the similarity analysis was conducted, and attribution of the major characteristic peaks was identified for SHXW quality control. GC-MS analysis was performed on a QP2010 instrument （Shimadzu, Japan） equipped with a capillary column of RTX-5MS. The column temperature was initiated at 50℃, held for 5 min, increased at the rate of 3 ℃/min to 120 ℃, held for 2 min, and then increased at the rate of 4 ℃/min to 220℃, held for 10 min. Helium carrier gas was used at a constant flow rate of 1.3 mL/min. Mass conditions were ionization voltage, 70 eV; injector temperature, 250℃; ion source temperature, 250 ℃; splitting ratio, 30：1; full scan mode in the 40-500 Da mass ranges with rate of 0.2 s per scan. Attribution of the major characteristic peaks was identified for SHXW by comparing the chemical standards, references of Chinese herbal medicines and the negative controls of prescription samples （NC） of SHXW. With the help of the temperature-programmed retention indices （PTRIs） used together with mass spectra and chemical standards, 25 major characteristic peaks have been identified. Nine volatile medicinal materials were identified in the prescription of SHXW by attributing to the 27 major characteristic peaks. The results demonstrate that the proposed method is a powerful approach to quality control of complex herbal medicines.

The study about how to improve the classroom control ability

Classroom teaching is a basic approach to complete the teaching mission, is also a key link to ensure the quality of teaching. The discretion of the teacher classroom control ability is the key to the success of classroom teaching. Ability to improve depends on teachers＇ language skills and demonstrate ability to improve, to delve into teaching material carefully to strengthen their own learning ability, to master a variety of teaching methods, pay attention to details of classroom teaching, teachers＇ teaching creativity into full play.

Phytochemistry,biological properties and quality control of Chuanxiong Rhizoma:a review

Chuanxiong Rhizoma is a widely used Chinese herbal medicine in the past 2000 years.Chuanxiong Rhizoma is composed of volatile oils,phthalide lactones,phenolic acids,polysaccharides and other compounds.To date,more than 149 compounds in Chuanxiong Rhizoma have been isolated and identified,and some of them have been reported to possess promising biological properties on cardiovascular and central nervous system disorders besides their anti-cancer and antioxidant effects.Modulation of inflammatory mediators and apoptotic factors are believed to contribute to its bioactivities.Analytical methods,such as HPLC,GC and UPLC,are employed for qualitative evaluation of Chuanxiong Rhizoma.In this work,harvest period,growing habitat,processing method and storage,which can affect the quality of Chuanxiong Rhizoma,were also discussed.Comprehensive quality control methods should be developed to ensure the safety,quality and efficacy use of Chuanxiong Rhizoma.Herein,we collected and analyzed the literature of Chuanxiong Rhizoma published on CNKI,ScienceDirect,Springer link,Wiley and PubMed in past two decades,and up-to-date information of Chuanxiong Rhizoma was provided in this paper.We suggested ligustilide,butylidenephthalide and total senkyunolides as the chemical markers to evaluate the quality of Chuanxiong Rhizoma.Additionally,the influences of soil conditions and processing methods on Chuanxiong Rhizoma as future research perspectives should also be further assessed.