切口测量标线尺

目前,临床需作标线设计的手术切口,均直视揣测标线,由于无尺具测绘,经常出现误差,术中即增加了缝皮难度,又影响皮缘对贴,我们研制的切口测量标线尺,可用于供皮区及V、Z、Y、X、弧、梭形、唇裂等切口的测绘,经60例手术使用,效果较好。介绍如下:

论社会主义国家人口发展目标

人是社会生活的主体和基础.人口的发展从原始社会起到未来的共产主义社会,始终要与生产力和生产关系相适应.一定时期一个国家或一个地区的人口数量、质量和分布都要受社会生产力的制约.原始社会的出生率和死亡率均在50‰.左右,当时人口的增长率一个世纪约为1.5%左右,平均期望寿命为20岁左右,每二百平方公里的人口密度约为1人,这种人口状况和人口结构是原始社会生产力的具体反映.当前(1982年年中)

中国测绘仪器行业中的一颗明珠

经理:马超 在我国测绘仪器行业中,出现了一颗耀眼的明珠——南方测绘仪公司。 一群二十几岁的青年,在自谓“南方人”的北方汉子在马超的率领下,以非凡的胆识,超群的勇气,用了仅仅四年的时间,就成为全国测绘仪器行业中的盟主,使这个名不见经传的南方测绘仪器公司成为聚科、工、贸于一体的专业化集团公司,这不能不说是创造了我国测绘仪器行中的奇迹。 南方测绘仪器公司创办于1989年4月。这个位于广州经济技术开发区的小小国营企业,当时只有15万元启动资金和半间小屋,人也只有两名。四年过去了,这个测绘仪器行业中的无名小卒竟擎起了全国同行业的大旗。

流量测量中温压补偿测点的设计

针对流量计在测量气体和蒸汽流量时需对温度、压力补偿的问题,根据各流量计的测量原理不同,选择合适的测温点和测压点位置对测量的准确性至关重要。分析了几种流量计温度、压力补偿的目的以及温度、压力参数的测量要求,提出了测温口、测压口开口位置的合理选择。提供了利用焦耳汤姆逊系数计算上下游温差的实例。

浅圆仓测温电缆孔密闭新方法

我国由世界银行贷款建仓项目将浅圆仓作为一种新的仓房类型引入国内,主要用于粮食流通.在中央直属储备粮库建设中又将这一仓型应用到部分中央直属储备粮库中.

住宅和第三产业

这是卡斯特尔的1个一般饭店,有335个床位,能源控制局的“太阳效果质量保证”的国家活动就是在这里“开球”的。 每天需用卫生热水约7米~3,其中65％（在夏天的某些日子可达90％）是由89米~2的太阳能装置提供的,不足部分由电来补齐。 能源控制局鼓励此系统的设计者、制造者、安装者和经营者并向工程的主人作性能的担保,用控制仪器长期地测量和跟踪。当出现故障或效果一般时,这个小组将向饭店作出补贴和赔偿,以补偿其有可赚钱的机会但没有赚到的钱。 销售6个月后无事故,在储水槽出口测量是30万千瓦,超过预期20％。

Determination of Astragaloside IV in Yupingfeng Oral Solution by HPLC-ELSD Method

[Objective] This study aimed to establish a method for determining the content of Astragaloside IV in Yupingfeng oral solution.[Method] The HPLC-ELSD method was adopted.The chromatographic column was Venusil MP（4.6 mm × 150 mm,5 μm）.The mobile phase was acetonitrile-water（35∶65）.The ELSD evaporator tube temperature was 65 ℃.N2 was used as the carrier gas（pressure,30 psi）.[Result] When the content of Astragaloside IV ranged from 0.5 to 5.0 μg,the Astragaloside IV content showed a good linear relationship with peak area（r=0.999,n=6）.The average recovery was 96.36%,and the RSD was 2.46%.[Conclusion] This method is accurate and reliable,and can be applied in the quality control of Yupingfeng oral solution.

Diurnal Variation of Soil CO2 Efflux and Its Optimal Measuring Time-window of Temperate Meadow Steppes in Western Songnen Plain, China

In order to study the diurnal variation of soil CO2 effiux from temperate meadow steppes in Northeast China, and determine the best time for observation, a field experiment was conducted with a LI-6400 soil CO2 flux system under five typical plant communi- ties （Suaeda glauca （Sg）, Chloris virgata （Cv）, Puecinellia distans （Pd）, Leymus chinensis （Lc） and Phragmites australis （Pa）） and an alkali-spot land （As） at the meadow steppe of western Songnen Plain. The results showed that the diurnal variation of soil CO2 effiux exhibited a single peak curve in the growing season. Diurnal maximum soil respiration （Rs） often appeared between 1 1：00 and 13：00, while the minimum occurred at 21：00-23：00 or before dawn. Air temperature near the soil surface （Ta） and soil temperature at 10 cm depth （Tlo） exerted dominant control on the diurnal variations of soil respiration. The time-windows 7：00-9：00 could be used as the optimal measuring time to represent the daily mean soil CO2 effiux at the Cv, Pd, Lc and Pa sites. The daily mean soil CO2 effiux was close to the soil COz effiux from 15：00 to 17：00 and the mean of 2 individual soil CO2 effiux from 15：00 to 19：00 at the As and Sg sites, respectively. During nocturnal hours, negative soil CO2 fluxes （CO2 downwards into the soil） were frequently observed at the As and Sg sites, the magnitude of the negative CO2 fluxes were 0.10-1.55 gmol/（m2.s） and 0.10-0.69 gmol/（m2.s）at the two sites. The results im- plied that alkaline soils could absorb CO2 under natural condition, which might have significant implications to the global carbon budget accounting.

Vehicle actuation based short-term traffic flow prediction model for signalized intersections

Traffic flow prediction is an important component for real-time traffic-adaptive signal control in urban arterial networks.By exploring available detector and signal controller information from neighboring intersections,a dynamic data-driven flow prediction model was developed.The model consists of two prediction components based on the signal states(red or green) for each movement at an upstream intersection.The characteristics of each signal state were carefully examined and the corresponding travel time from the upstream intersection to the approach in question at the downstream intersection was predicted.With an online turning proportion estimation method,along with the predicted travel times,the anticipated vehicle arrivals can be forecasted at the downstream intersection.The model performance was tested at a set of two signalized intersections located in the city of Gainesville,Florida,USA,using the CORSIM microscopic simulation package.Analysis results show that the model agrees well with empirical arrival data measured at 10 s intervals within an acceptable range of 10%-20%,and show a normal distribution.It is reasonably believed that the model has potential applicability for use in truly proactive real-time traffic adaptive signal control systems.

Research on Visual Detection Algorithm for Groove Feature Sizes by Means of Structured Light Projection

The visual inspection is an economical and effective method for welding. For measuring the feature sizes of grooves,a method based on line structured light is presented. Firstly,an adaptive algorithm to extract the subpixel centerline of structured light stripes is introduced to deal with the uneven width and grayscale distributions of laser stripes,which is based on the quadratic weighted grayscale centroid. By means of region-of-interest(ROI)division and image difference,an image preprocessing algorithm is developed for filtering noise and improving image quality. Furthermore,to acquire geometrical dimensions of various grooves and groove types precisely,the subpixel feature point extraction algorithm of grooves is designed. Finally, experimental results of feature size measuring show that the absolute error of measurement is 0.031—0.176 mm,and the relative error of measurement is 0.2%—3.6%.

Nutritional risk index as a predictor of postoperative wound complications after gastrectomy

AIM： To investigate the correlation between the nutri- tional risk index （NRI） and postoperative wound com- plications.

Face mask detection algorithm based on HSV+HOG features and SVM

To automatically detecting whether a person is wearing mask properly,we propose a face mask detection algorithm based on hue-saturation-value(HSV)+histogram of oriented gradient(HOG)features and support vector machines(SVM).Firstly,human face and five feature points are detected with RetinaFace face detection algorithm.The feature points are used to locate to mouth and nose region,and HSV+HOG features of this region are extracted and input to SVM for training to realize detection of wearing masks or not.Secondly,RetinaFace is used to locate to nasal tip area of face,and YCrCb elliptical skin tone model is used to detect the exposure of skin in the nasal tip area,and the optimal classification threshold can be found to determine whether the wear is properly according to experimental results.Experiments show that the accuracy of detecting whether mask is worn can reach 97.9%,and the accuracy of detecting whether mask is worn correctly can reach 87.55%,which verifies the feasibility of the algorithm.

Comparative analysis of chemical components between barks and leaves of Eucommia ulmoides Oliver

The chemical components of the essential oils in the barks and leaves of Eucommia ulmoides Oliver were analyzed and compared by chromatograms and mass spectra technique, heuristic evolving latent projections (HELP), alternative moving window factor analysis (AMWFA) algorithms and normalization method based on the peak areas; the flavones in the barks and leaves of Eucommia ulmoides Oliver were separated on an ODS column by gradient elution carried out with the flow phase consisting of water, methanol and phosphoric acid (0.1%), and their contents were quantitatively determined by standard curve method and diode array detection (DAD) at 362 nm. The results show that 68 and 73 compounds respectively from essential oils of the barks and leaves of Eucommia ulmoides Oliver are identified, and there are 33 mutual compounds among 108 compounds determined. The total contents of these volatile components of the two samples possess 92.9% and 97.75% of the gross of the relevant essential oils, respectively; the contents of the rutin, quercetin and kaempferol in the barks and leaves of Eucommia ulmoides Oliver are 0.016 9, 0.003 6, 0.002 1 and 0.064 4, 0.030 2, 0.010 0 mg/g, respectively, and the determination recoveries are 95.2%-106.2%. The comparative analysis shows that for the barks and leaves of Eucommia ulmoides Oliver, there are significant differences in their components of the relevant essential oils and flavones.

Studying the mechanical properties of the soil-root interface using the pullout test method

It is important to quantify the effect of the root diameter, the embedment length of the root and load speed on the soil-root interface mechanical properties for studying the root anchorage. The soilroot interface mechanical properties can be obtained through the pullout force and root slippage curve(F-S curve). About 120 Pinus tabulaeformis single roots whose diameters ranged from 1 mm to 10 mm divided into 6 groups based on different root embedment length(50 mm, 100 mm and 150 mm) and different load velocity(10 mm·min^(-1), 50 mm·min^(-1), 100 mm·min^(-1) and 300 mm·min^(-1)) were investigated using the pullout method. This study aims to explore the mechanical properties of the soil-root interface in the real conditions using the pullout test method. The results showed two kinds of pullout test failure modes during the experimental process: breakage failure and pullout failure. The results showed that the roots were easier to be broken when the root diameter was smaller or the loading speed was larger. The relationship between the maximum anchorage force and root diameter was linear and the linearly dependent coefficient(R^2) was larger than 0.85. The anchorage force increased with the root embedment length. An increase of 10%^(-1)5% for the maximumanchorage force was found when load speed increased from 10 to 300 mm.min^(-1). The mean peak slippage of the root was from 13.81 to 35.79 mm when the load velocity varied from 10 to 300 mm.min^(-1). The study will be helpful for the design of slopes reinforced by vegetation and in predicting risk of uprooting of trees, and will have practical benefits for understanding the mechanism of landslide.

Changes of ghrelin following oral glucose tolerance test in obese children with insulin resistance

AIM： To characterize changes in ghrelin levels in response to oral glucose tolerance test （OGTT） and to correlate changes in ghrelin levels with changes in insulin and glucose following OGTT in Chinese obese children of Tanner Ⅰ and Ⅱ stage with insulin resistance. METHODS： 22 obese children with insulin resistance state were divided into four groups according to their Tanner stage and gender： boys of Tanner Ⅰ （fir- Ⅰ ）, boys of Tanner Ⅱ（BT-Ⅱ ）, girls of Tanner Ⅰ （GT- Ⅰ ）, girls of Tanner Ⅱ （GT-Ⅱ）. Ghrelin, insulin and glucose were measured at 0, 30, 60 and 120 rain following OGTT. The control children with normal BMI were divided into control boys of Tanner Ⅰ （CBT- Ⅰ, n = 6）, control boys of Tanner Ⅱ （CBT-Ⅱ, n = 5）, control girls of Tanner Ⅰ （CGT- Ⅰ, n = 6）, control girls of Tanner Ⅱ （CGT-Ⅱ, n = 5）. Fasting serum ghrelin levels were analyzed. RESULTS： Ghrelin levels were lower in obese groups. Ghrelin levels of control group decreased in Tanner Ⅱ stage （CGT- Ⅰ vs CGT-Ⅱ t = -4.703, P = 0.001; CBT- Ⅰ vs CBT- Ⅱ t = -4.794, P = 0.001）. Basal ghrelin levels in fir-Ⅱ decreased more significantly than that in BT- Ⅰ group （t = 2.547, P = 0.029）. Ghrelin levels expressed a downward trend after OGTT among obese children. The decrease in ghrelin levels at 60 min with respect to basal values was 56.9% in BT- Ⅰ. Ghrelin concentrations at 0 min correlated directly with glucose level at 0 min in fir- Ⅰ （r = 0.898, P = 0.015）. There wasn＇t a significant correlation of ghrelin changes with glucose changes and insulin changes during OGTT in obese children with insulin resistance. CONCLUSION： In conclusion, in obese children with insulin resistance, ghrelin levels decreased with advancing pubertal stage. Ghrelin secretion suppression following OGTT was influenced by gender and pubertal stage. Baseline ghrelin levels and ghrelin suppression after OGTT did not significantly correlate with the degree of insulin resistance and insulin sensitivity.

Diagnostic accuracy of tests for Helicobacter pylori in an Alaska Native population

AIM： TO evaluate the accuracy of two non-invasive tests in a population of Alaska Native persons. High rates of Helicobacter pylori （H. pylon] infection, H. pyIori treatment failure, and gastric cancer in this population necessitate documentation of infection status at multiple time points over a patient＇s life.urease test, 13C urea breath test （UBT）, and immunoglobulin G antibodies to H. pylori in serum. The performances of 13C-UBT and antibody test were compared to a gold standard defined by a positive H. pylori test by culture or, in case of a negative culture result, by positive histology and a positive rapid urease test.RESULTS： The sensitivity and specificity of the 13C- UBT were 93% and 88%, respectively, relative to the gold standard. The antibody test had an equivalent sensitivity of 93% with a reduced specificity of 68%. The false positive results for the antibody test were associated with previous treatment for an H. pylorlinfection [relative risk （RR） = 2.8]. High levels of antibodies to H. py/or/were associated with chronic gastritis and male gender, while high scores in the 13C-UBT test were associated with older age and with theH. pylori bacteria load on histological examination （RR = 4.4）. CONCLUSION： The 13C-UBT outperformed the antibody test for H. pylori and could be used when a noninvasive test is clinically necessary to document treatment outcome or when monitoring for reinfection.