利用Varian Cary 50分析西瓜汁中的铁

借助Varian Cary 50紫外可见分光光度计,用邻二氮菲分光光度法,对西瓜汁中铁进行测定;并对分光光度法的最佳条件,包括酸度、试剂用量、显色时间、显色温度以及干扰情况等进行了分析。

安捷伦举办Cary 7000通用型分光光度计(UMS)VIP研讨会

2013年9月2日,上海——近日,全球分析、测量技术的领导者安捷伦科技公司在上海举办'Cary7000通用型分光光度计VIP研讨会(下称’研讨会’)'。多名业界专家、实验室技术人员和用户代表参加了此次研讨会。会上,安捷伦介绍并演示了新品Cary 7000通用型分光光度计(UMS)的应用及其软硬件功能,全面、深入地展现了其作为安捷伦全新一代光学材料测试平台,助力中国用户所实现的突破。

Cary CD-303 HDCD播放机

来自美国的发烧厂家Cary的产品有超级土炮之称，意思是说Cary的声音很出色，但制作工艺方面和日本大厂以及欧美几个Hi-End级厂家的产品相比，显得业余了一些。这种说法真的很确切，这台Cary CD-303的加工的确是略微粗糙了一点，装配工艺也不那么专业，有点象是发烧友自己焊制的“土炮”。但另一方面，CD-303真正是一部发烧级的CD机，机箱用2mm厚的钢板制成，令机器结构相当结实，同时增加了重量和稳定度。

The Oral Health Status of Person with Special Needs in Kumasi

Background: The most prevalent non-communicable disease worldwide is oral health-related disease, with dental caries and periodontal conditions being common. Oral health status significantly impacts overall health and quality of life. Barriers to dental care affect children with special needs. This study evaluates the oral health status and treatment requirements of people with special needs. Methodology: This descriptive cross-sectional study in Kumasi, Ghana examined oral health status among people, 121 children with special needs over two months, in June-July 2022. Dental caries, periodontal changes, malocclusion, and trauma were assessed. The data was analyzed using SPSS 20.0. Results: The oral health status among people with special needs in this study was generally moderate, with a range from very good to very poor. The prevalence of dental caries was 37%, with a mean DMFT score of 2.82. Periodontal health showed unsatisfactory indicators such as mobile teeth, poor gingival health, high plaque scores, and the presence of halitosis. Conclusion: This descriptive study aimed to provide baseline data on the oral health status of special needs students in Kumasi, addressing the lack of knowledge in this area. It highlighted the importance of dental care in maintaining good oral health and overall well-being in individuals with special needs. Coordinated efforts by dental professionals are needed to provide dental health education and preventive interventions for these children.

Associated Factors of Dental Caries among Intellectually Disabled Persons in Specialized Centers of Ouagadougou

Introduction: Several studies have reported a high prevalence of dental caries among the people with intellectual disabilities. In order to identify the sociodemographic, clinical and behavioral factors associated with it, we conducted a study in specialized centers welcoming subjects with intellectual disabilities in Ouagadougou (Burkina Faso). Objectives: The objective of this study was to identify the factors associated with it among intellectually disabled in the specialized centers of Ouagadougou. Methods: The study was cross-sectional analytical. The survey took place between November 2020 and January 2021 among people with intellectual disabilities in reception centers receiving a grant from the Ministry of Women, National Solidarity, Family and Humanitarian Action. Data collection was done with a questionnaire adapted from the World Health Organization (WHO) and dental caries was recorded according to WHO criteria in decayed, missing or filled teeth generating a DMF index. Logistic regression was used to identify factors associated with the presence of dental caries. Results: A total of 193 participants were included in the study with an average age of 12.4 years ± 7.9. The overall prevalence of caries measured with the DMF index was 58.6% 95% CI [51.2 - 65.8]. It was significantly associated with female gender (OR = 4.2;95% CI [1.4 - 12.5], p = 0,01), the clinical form of mental illness (epilepsy OR = 3.8 95%;CI [1.2 - 12.7], p = 0,02, trisomy OR = 5.0;95% CI [1.1 - 22.9], p = 0,03, motor autonomy OR = 0.2 95%;CI [0.1 - 0.7], p = 0,01) and at use of toothpaste OR = 9.33;95% CI [1.05 - 82.7], p = 0,04. Conclusion: Dental caries remains a very present pathology in most people living with an intellectual disability. Also, it is necessary to put in place prevention strategies to reduce its prevalence and improve access to oral care for these people.

Analysis of the Effectiveness of Modified Non- Traumatic Filling Technology in the Treatment of Pediatric Dental Caries

Objective:To analyze the effectiveness of modified non-traumatic filling technology in the treatment of pediatric dental caries.Methods:Ninety-seven children with dental caries who were treated in our hospital(Panyu Maternal and Child Care Service Center of Guangzhou)from January 2022 to December 2023 were selected and randomly divided into two groups,with 48 cases in the experimental group and 49 in the control group.The experimental group was treated with modified non-traumatic filling techniques,while the control group was treated with conventional filling techniques.Observation indicators such as the total effectiveness of the treatment,incidence of adverse events,treatment compliance,and pain scores were analyzed after the intervention.Result:After intervention,the total effectiveness of the treatment in the experimental group was higher than that in the control group(P<0.05).The incidence of adverse events in the experimental group was lower than that of the control group(P<0.05).The treatment compliance of patients in the experimental group was higher than that in the control group(P<0.05).The pain score of the experimental group was lower than that of the control group(P<0.05).Conclusion:The application of modified non-traumatic filling technology in the treatment of pediatric dental caries showed good therapeutic outcomes.After the intervention,the child’s symptoms were significantly alleviated,the incidence of adverse events such as filling material falling off was reduced,their compliance was improved,and the pain was relieved.This procedure is worth to be promoted for clinical application.

Cary Audio MS-1

Cary Audio最近推出了一款全新的数字音乐服务器MS-1，内置了一组1TB容量的SATA接口硬盘以及一个高速光驱，可以记录2800张无压缩的音乐CD。记录格式方面，包括WAV、FLAC、ogg、aac、mp3等等。MS-1还具备了完整的网络音乐播放能力，带有网络、USB等接口，能够连接U盘、移动硬盘等储存设备，还能支持网络电台播放，支持苹果所推出的所有数字播放设备的连接与播放。

Research on the detection of early caries based on hyperspectral imaging

Objective:We applied hyperspectral imaging(HSI)system to distinguish early caries from soundand pigmented areas.It will provide a theoretical basis and technical support,for research anddevelopment of an instrument that could be used for screening and detection of early dentalcaries.Methods:Eighteen extracted human teeth(molars and premolars),with varying degrees ofnatural pathology and no degree of decay involving dentin were obtained.HSI system with awavelength range from 400 to 1000nm was used to obtain images of all 18 teeth containingsound,carious and pigmented areas.We compared the spectra of the wavebands at both 500 nmand 780 nm from the different tooth states,and the reflectance diference bet ween sound versuscarious lesions and sound versus pigmented areas,respectively.Results:There was a slight diference in refectance bet ween carious areas and pigmented areas at500 nm.A substantial difference was additionally noted in refectance bet ween carious areas andpigmented areas at 780 nm.Conclusion:The results have shown that the interference of tooth surface pigment can be elim-inated in the near-infrared(NIR)waveband,and the caries can be effectively identifed from the pigmented areas.Thus,it could be used to detect carious areas of teeth in place of the traditionalvisual inspection method or white light endoscopy.Clinical significance:The NIR difused light signal enables the identification of early caries frompigment and other interference,providing a reasonable detection tool for early detection andearly treatment of teeth diseases.

Application of Scanning Acoustic Microscopy for Detection of Dental Caries Lesion

Introduction: A scanning acoustic microscope (SAM) is an apparatus for imaging acoustic properties. This apparatus can non-invasively and rapidly evaluate the hardness of materials in the elastic region. This device shows great potential for the diagnosis of dental caries in the clinical setting. However, since the tissue elastic modulus measured using a SAM is a property of the elastic region and the Knoop hardness is a property of the plastic region, the hardness properties differ completely. Therefore, we investigated whether the acoustic impedance measured using a SAM is related to the Knoop hardness, which is used as the standard for removal of carious dentin. Method: Polished sections were prepared from 20 extracted carious wisdom teeth. The acoustic impedance and Knoop hardness were measured for each section. In addition to comparing carious and healthy dentin in SAM images, we evaluated the difference between the carious and healthy dentin in terms of the acoustic impedance and Knoop hardness. We also evaluated the correlation between the Knoop hardness and acoustic impedance. Results: The SAM images were visualized as two-dimensional color images based on the acoustic impedance values. The mean acoustic impedance of carious dentin was significantly lower than that of healthy dentin, showing a similar trend as Knoop hardness. A strong correlation was observed between the two. Discussion: The acoustic impedance values obtained through acoustic microscopy differed significantly between carious and sound dentin. Both types of dentins were visualized using two-dimensional color images. A strong correlation was observed between the acoustic impedance value, which indicates the hardness of the elastic region, and the Knoop hardness, which indicates the hardness of the plastic region. The results of the present study indicate that acoustic impedance accurately reflects the hardness of dentin.

小型快速扫描近红外光谱仪的研制

介绍了一种基于Czerny-Turner光路结构并采用谐波电机直接驱动光栅的小型快速近红外光谱仪的设计、仿真及初步测试结果.为了减小多次反射及衍射产生的杂散光,运用Cary理论进行光路布局与设计,使用光学软件TracePro进行了仿真,结果显示改进之后的结构有效抑制了系统的杂散光.为了减小体积并提高扫描光谱速度,采用谐波电机直接驱动光栅代替传统的电机传动正弦丝杆再驱动光栅的结构,在近红外光波段对样机性能进行了初步测试,并对葡萄糖水溶液进行了定性测量.初步测试结果显示：波长范围800~1 500 nm,扫描速度达到75 nm/s,光谱分辨率6 nm,波长准确性±0.5 nm,重复性≤1 nm,信噪比为1 000∶3,吸光度重复性≤0.008 AU,基线稳定性0.000 5 A/h,简单葡萄糖水溶液的定性测试结果比较清晰地反映了样品的特性.

Oral Health Patterns among Pregnant Women Attending Antenatal Clinic in Bamenda

Introduction: Pregnancy can be a risk factor for dental diseases as oral tissues are liable to changes due to hormonal variations. High levels of secretion of progesterone predispose gums tissues to inflammation leading to gingivitis. Also, oral pathologies in pregnant women can adversely affect pregnancy outcomes. This may be because pro-inflammatory cytokines are released into the system of the pregnant woman, which can reach the womb, causing harm to the baby. Pathogenic bacteria can also get into circulation leading to septicemia. This can cause abortion, preterm delivery, low birth weight, pre-eclampsia and many others. There is a high prevalence of oral diseases in pregnant women in developing countries, but just a few of them actually access dental care services. This is more rampant in countries with no oral health programs and where oral health is not included in the antenatal care package. Lack of knowledge about the importance of oral health to pregnancy outcome, cost of dental treatment, as well as fear of the effect of dental treatment on pregnancy, are among the barriers to pregnant women not accessing dental care services during pregnancy. Objective: The main objective of the study was to assess the oral health status among pregnant women attending antenatal clinics in Bamenda. Methods: A cross-sectional community-based study was carried out on 295 pregnant women attending ANC in Nkwen, Mankon, and Bamendankwen, which have specialized dental units and so all these pregnan

三种方法检测口蹄疫146S抗原含量及抗原稳定性的比较研究

为比较三种口蹄疫146S抗原含量检测方法,分别用蔗糖密度梯度离心结合安捷伦Cary 100紫外分光光度计定量法、蔗糖密度梯度离心结合安捷伦1260液相色谱仪定量法及高效液相体积排阻色谱法三种检测方法,对口蹄疫灭活抗原中的146S含量进行检测,对三种检测方法的数据进行统计分析。将口蹄疫A型抗原和O型抗原各一株分别4℃放置12个月以及反复多次冷冻处理;口蹄疫抗原用全能核酸酶处理,然后用蔗糖密度梯度离心结合安捷伦1260液相色谱仪定量法检测处理前后的146S抗原含量变化。结果显示,三种检测方法的检测数值相关性极显著,呈正相关性;4℃放置12个月后的抗原含量没有变化,而反复多次冷冻处理后的抗原含量降解非常多;全能核酸酶处理后的抗原含杂蛋白少。本研究表明,基于临床需求,蔗糖密度梯度离心结合安捷伦1260液相色谱仪定量法更适合口蹄疫抗原检测;口蹄疫抗原适合于4℃保存;全能核酸酶能有效去除杂蛋白干扰,提高色谱纯化效率。

多波束测深质量评价方法分析

利用Caris多波束处理软件、Global Mapper图形处理和Surfer处理软件中三角网网格化的方法来处理多波束水深数据,从整个测量范围来做水深准确度检验,由传统的水深数据处理线统计发展到面统计,能更有效的评价多波束资料的质量,提高质量控制的水平。

CARIS HPD软件制作长江电子航道图源数据技术方法

以数字化、信息化和智能化为特点的数字长江,是实现长江航运现代化的重要支撑。随着长江航道数字化建设步伐的加快,长江电子航道图的应用需求日益广泛。结合1.0版本长江电子航道图制作实践体会,对电子航道图制作软件CARIS HPD的体系结构及电子航道图源数据的制作方法进行阐述,并对实际生产中存在的问题进行探讨。

在CARIS HIPS中实现多潮位站水位改正

多波束测深系统以其高精度、宽覆盖的作业特点在海道测量中得到了广泛的应用,但多年来,多验潮站的潮位改正问题成为制约其在大区域应用的瓶颈。主要阐述了在最为常用的多波束数据后处理软件CARIS HIPS中如何实现多验潮站潮位改正,并以条带测量区域为例验证了其精度。

深水多波束回波强度数据处理技术探讨

多波束回波强度数据不但可用于分析和解释海底地貌,也可用于反演海底底质类型及其分布状况或者水下目标识别方面的研究。以EM 122多波束声纳系统数据为例,详细探讨应用CARIS多波束处理软件对某深水多波束作业区的回波强度数据的处理过程。根据软件处理后的数据浅析灰度量化及拼接方法,进一步改善声强图像的质量,后处理图像为多波束水下目标识别和海底底质分类研究提供准确、表述清晰的基础数据。

一种低复杂度的降低MIMO-OFDM峰平比的CARI方法

天线旋转取反算法(CARI)是降低MIMO-OFDM系统峰平功率比(PAPR)的一种性能较优的算法,不足之处是其迭代次数很大。CARI的次最优算法逐次次最优天线旋转取反(SS-CARI)算法虽然可以减小迭代次数,但性能损失又比较大。针对这一问题,提出了一种用滑动窗搜索旋转取反组合的次最优CARI方法,利用滑动窗搜索局部最优的旋转取反组合,既可以避免整体的遍历搜索大大减小CARI算法的计算复杂度,又可以改善SS-CARI的PAPR减小性能。仿真结果表明,该方法能够在系统复杂度与PAPR降低性能上取得很好的折衷。

近海区域多波束水深测量的水位改正方法

阐述了近海区域由监测验潮站实测潮位和天文预报潮位,以及模拟站的天文预报潮位获得模拟站接近实测的水位改正资料的理论和方法,在Caris Hips软件中得到成功应用,并在主检比对中获得满意的效果,资料满足《海道测量规范》要求。

降低MIMO-OFDM系统PAPR的一种改进方法

MIMO-OFDM已成为4G宽带无线通信中极具前景的备选方案,但MIMO-OFDM系统中存在一个主要缺点——高峰均比,本文基于天线旋转取反方法,提出了多天线系统PAPR降低的改进方法,充分利用增加天线提供的自由度,改善了系统性能。性能分析表明,所用方法可以获得明显的峰均比改善,并提出了两种次最优方法,降低了计算复杂度,实现更为简便。

低龄儿童龋病风险评估

低龄儿童龋病为最常见的儿童口腔疾病,其发病率高,严重影响小儿健康。儿童龋病风险评估通过对儿童个体综合分析,评估患龋风险,制定相应的防龋策略,最终达到预防或治疗早期龋齿的目的。国外近年来对儿童龋病风险评估研究较多,已开发多种评估系统。本文旨在比较3个较为成熟的儿童龋病风险评估系统,即通过风险评估控制龋病、龋病风险评估工具和龋病评估程序,对此做一综述。