Influence of Urban Street Greening Design under the Concept of Green Healthy Cities:A Case Study of Hefei City

In order to explore the influence of urban street greening,the street landscape of Changjiang West Road and Xiyou Road in Hefei City was selected as the research sample to study the design of urban street landscape under the concept of green healthy cities.The results show that the urban street landscape of Hefei City is single in design and plant type,and plant maintenance management is not good.It is proposed to strengthen the maintenance and management of street greening,increase the types of native plants,and improve cultural connotation,so as to enhance the artistry,regionalism and functionality of urban street landscape in Hefei City.

ARMS实时PCR基因分型特异性的研究

以原癌基因Kras基因12位密码子的4种基因型(野生型为GGT,突变型为AGT、TGT、CGT)质粒DNA为研究模型,采用SYBRGreenⅠ为实时PCR指示剂,进行ARMS实时PCR基因分型特异性的研究.结果表明:在和模板匹配的ARMS引物3′端附近引入故意错配碱基,将ARMS引物浓度稀释10倍,并对传统三步PCR循环进行改良,即根据目的产物和引物二聚体的熔点差异,在传统延伸步骤之后增加一步恒温80℃检测荧光步骤,可消除引物二聚体的影响,使ARMS引物的特异性增强,得到清晰的基因分型结果.实验表明这种基于SYBRGreenⅠ的ARMS实时PCR基因分型方法,无需合成探针,实验设计简单,是一种快速、简便、经济、特异性好的基因分型方法,可推广用于其他基因的分型,并可望成为应用于临床的基因诊断技术之一.

Investigation and Analysis of Street Greening Plants in Youjiang District, Baise City

Major greening plants in Youjiang District, Baise City were investigated, species composition and growth status of these plants were analyzed. On this basis, advantages and existing problems of street landscaping in the study area were summarized to improve landscaping level and urban environment of the city.

肝细胞癌病人血浆循环DNA定量分析及其临床意义

目的 定量检测肝细胞癌 (HCC)病人血浆循环DNA并探讨其临床价值。方法 收集 79例肝功能正常的HCC病人术前血浆样本以及 2 0例健康志愿者、2 0例代偿期肝硬化病人和 2 0例活动性乙型肝炎病人的血浆样本 ,抽提血浆循环DNA。将血浆循环DNA与荧光染料SYBRgreenⅠ按比例稀释并充分混匀后通过紫外与可见光成像分析系统定量。结果 HCC、肝硬化和肝炎病人血浆循环DNA浓度分别为 (47.1± 4 3.7)ng/mL、(30 .0± 1 3.3)ng/mL和 (6 5 .3± 71 .6 )ng/mL ,均明显高于健康人群血浆循环DNA浓度 (1 7.6± 9.5 )ng/mL ,差异在统计学上有显著性 (P =0 .0 0 0 ;P =0 .0 0 2 ;P =0 .0 0 1 ) ,而HCC和肝硬化病人以及病毒性肝炎病人两组之间的血浆循环DNA浓度无明显差异 (P =0 .1 91 ;P =0 .6 85 )。伴肝内播散灶或脉管癌栓的 4 1例HCC病人的血浆循环DNA浓度 (5 4 .3± 4 1 .6 )ng/mL明显高于不伴肝内播散灶或脉管癌栓的 38例病人 (39.3± 4 5 .0 )ng/mL(P=0 .0 0 2 )。血浆循环DNA浓度与HCC病人肿瘤大小、TNM分期、2年无瘤生存率、1年和 2年总体生存率密切相关 (P =0 .0 0 8;P =0 .0 4 0 ;P =0 .0 1 0 ;P =0 .0 1 6 ;P =0 .0 0 1 ) ,而与肿瘤数目、肿瘤包膜、肿瘤分化、血清AFP浓度及 1年无瘤生存率无明显关系。多因素分?

荧光相关光谱单分子检测系统的研究

基于激光共焦构型,构建了一套高灵敏度和高稳定性的荧光相关光谱单分子检测系统。采用高数值孔径物镜使激光束高度聚焦,并用同一物镜收集样品的荧光,单光子计数器用于实时记录荧光信号。优化系统保持物镜焦点、针孔以及单光子计数器光敏区高度同轴。采用60×1.2(NA)的水浸物镜及直径为160μm的针孔得到的检测系统结构参数为ω0和z0分别为0.42μm和1.33μm,照射微区的体积为1.3fL。单个RhodamineGreen分子可获得13倍的信噪比。用该系统获得了小分子和生物大分子(DNA片段和蛋白质)的高质量荧光相关图谱,成功实现了单个分子的检测。

Exploring Location Pattern of Commercial Stores in Shichahai, Beijing from a Street Centrality Perspective

The location pattern of different commercial stores in Shichahai, a historic conservation area in Beijing, was investigated from a street centrality perspective. Many previous studies have investigated the relationship between street centrality and land use patterns or commercial activities at interurban or intraurban scales. We considered Shichahai in this study to determine if street centrality applied at the street scale and if the street network was the only factor influencing the selection of store location. First, the nearest neighbor index, nearest neighbor hierarchical spatial cluster(NNHSC), and kernel density estimation(KDE) methods were used to provide baseline spatial distributions of commercial stores. Second, urban network analysis(UNA) tools were used to measure the street centrality indices under two conditions, with and without the weighting of cultural relics calculated by a principal component analysis(PCA). Finally, both store locations and centrality values at nodes were transformed to one unit(raster pixel) for a correlation analysis.The results showed that three of the four store types were clustered and had their own hotspots that were mostly located in the eastern and central parts of city blocks. The most momentous findings were determined from the street centrality indices. Among the three store types with correlation coefficients above 0.5, all centrality indices with landmark weighting, except straightness, had higher correlations,with closeness with landmark weighting having the highest correlation, followed by betweenness with landmark weighting. Therefore,we statistically concluded that street centrality could apply at the street scale and that the street network was not the only factor that influenced store location pattern, with landmarks also playing a significant role. The results provide guidance in determining the selection strategy for stores in a historic conservation area.

利用油藏描述改进Uinta盆地B1uebell油田完井技术及提高采收率

Bluebell油田是犹他州Uinta盆地的最大石油产出地区。该油田包括300多口井，而且已经从古新统一始新统湖泊相和河流相沉积的GreenRiver组和Wasatch(Colton)组产出137万亿桶原油和177亿立方英尺天然气，石油和天然气的产出深度为3330～3940m，而且在Colton组的超压砂岩和下覆下Green river组的Flagstaff段存在非常丰富的油藏，尽管有大量的高产井(1～3万亿桶)，但是整个油田的原油产出率还不足10％，这样低的产出率至少部分是完井作业的后果，也制约了对优质储藏区域、水层和隐蔽储层的识别。结果，详细的描述B1uebell储藏历史已经变的困难了，制约了所有的提高产出率的方案。最近由美国能源部承担的一个课题已经注意到储藏特征的巨大作用了。这个课题涉及岩心分析、测井、压裂、地质统计、生产以及其他数据间的交叉科学。许多有价值的储藏特征新信息在完井作业和修井技术方面起了一定的作用。这些数据应该对Uinta盆地的类似湖泊相和相关的沉积相的储藏具有良好的实用性。

电子墨水微胶囊及电泳显示原型器件的制备

TiO2 particles coated with polystyrene which were prepared via in situ polymerization and oil green dye were dispersed in tetrachloroethylene and xylene, the mixture came to be electrophoretic ink and was encapsulated in to microcapsules by complex coacervation from gelatin and a hydrolyzed copolymer of styrene and maleic anhydride（SMA）. It was demonstrated that the membranes of the microcapsules were formed from nano sized coacervate droplets resulting from gelation and hydrolyzed SMA, which leads to a compact membrane structure. Microcapsules were characterized in terms of microstructure, morphologies by scanning electron microscopy（SEM）. Electrophoretic display prototype was prepared by coating electrophoretic ink microcapsules slurry on ITO glass with nearly single layer and sealed by UV curable adhesives. The characters “Zheda” in Chinese was firstly displayed at a low volt 9 V D.C..

Factors Contributing to Contamination of Street Foods in Bamako, Mali

The World Health Organization states that foodborne diseases are a worldwide public health issue. Although street foods can provide nutritious and affordable ready-to-eat meals for city dwellers, their health risks can outweigh the benefits. A cross-sectional study was conducted in the Bamako district, focusing on street food vendors near schools, universities, extensive markets, administrative centers, and major roads. We aimed to sample fifty (50) sellers per municipality, making 300 sellers for the Bamako district. We developed a survey sheet to collect data, and six teams rotated between the municipalities each month. Before starting the collection, the teams were provided administrative papers approved by the municipal authority. The survey revealed three types of sales sites: fixed (65%), semi-fixed (30%), and mobile (4.40%). The proportion of sellers was 26.8%, 23.2%, 19.7%, and 4.2% in municipalities III, IV, and I. In municipalities I, II, III, IV, and VI, respectively, 92%, 95.70%, 93%, 87.2%, and 100% of the sellers were female. The age distribution of sellers was 65.63%, 46.81%, 40.82%, 38.30%, 36.17%, 36%, and 32% in the 25-34 and 35 - 44 age groups. Illiteracy rates were 59.20%, 61.70%, 55.30%, 75%, and 56% in municipalities I, II, III, IV, and VI, respectively. The study identified two categories of sellers: 48.3% in type 1 and 51.7% in type 2. The first category comprised 154 sellers, and the second 165 sellers. The survey found that 66.00%, 56.00%, 48.90%, 44.90%, 38.30%, and 34.40% of municipal V, VI, III, I, II, and IV sales sites were open-air. In municipality I, 63.30% of the sites were under hangars, while in municipalities II and IV, the corresponding percentages were 51.10% and 59.40%, respectively. Moreover, 46.00%, 31.90%, 31.30%, 30.60%, and 27.70% of the sites in municipalities VI, II, IV, I, and III were located next to gutters. In conclusion, this study identified several factors that could compromise the quality of street foods sold in the six municipalities of Bamako.

台阶重力异常的梯度解释

Stanley、Green与Butler等人提出的重力异常梯度解释方法都是先利用重力异常水平梯度—垂直梯度图得到台阶的倾角与坐标原点(台阶倾斜面与地面的交线上)位置,然后直接利用重力异常水平与垂直梯度确定台阶的上、下底埋深。这些方法必须由人工操作完成,而且当台阶倾角超过10°时会产生较大的误差甚至无法求解。本文在推导二维台阶重力异常一阶及二阶导数与台阶埋深、倾角及产状之间关系的基础上,对Stanley等人的方法做了重要改进:1用最小方差方法以一个二次曲线拟合重力水平梯度与垂直梯度,由此自动计算台阶倾角;2由重力二阶导数推导出计算台阶上、下底埋深的表达式,并自动计算台阶上、下底埋深。与以前方法相比,本方法能够更准确、更快速地求出台阶(接触带)的产状。文中在最后给出六盘山盆地重力资料的计算实例。

冻土的有限变形本构关系的实验研究

根据有限变形理论,给出了冻土三轴蠕变实验数据处理时所需Green应变和Kirchhoff应力的计算公式,并根据冻土三轴蠕变实验结果给出冻土的有限变形本构关系及其蠕变参数。通过对冻土的实验数据对比分析可知:在相同试验条件下,应变较小时,小应变ε1 和Green应变Ez的数值几乎相等,随着应变的增加,两种表征方式的计算结果差别越来越大,可见对于冻土如果不考虑试件变形前后长度的变化,计算得出的应变偏离实际变形情况较大,因此冻土材料的本构关系采用有限变形表征更确切。根据冻土的有限变形本构关系计算得到的冻结壁内侧最大径向位移更接近实测结果,因此冻结壁设计计算依据冻土的有限变形本构关系更为合理。对今后冻结工程的设计具有参考价值。

Spatial Distribution Characteristics and Coverage Rate of Commercial Facilities in 15-minute Radius Livelihood Service Circles of Chunshu Street

Building a 15-minute radius livelihood service circle from the needs of residents is a topdown process of optimizing urban layout and promoting high-quality development implemented by the government.In September 2022,Xicheng District of Beijing served as a national pilot of the 15-minute radius livelihood service circle.Based on the data of POI,urban walking network and building outline,this paper studies the coverage of commercial service facilities in the 15-minute radius livelihood service circle of Chunshu Street by using kernel density analysis and urban network analysis tools.The research shows that the commercial facilities are concentrated in Zhuangsheng Square and Dazhalan commercial district.There are large gaps in housekeeping and couriers logistics facilities,which need to be further improved.

机械力固相化学反应法合成稀土磷酸盐绿色荧光粉

以CeCl3·7H2O,La(NO3)3·6H2O,Tb(NO3)3·6H2O,(NH4)2HPO4和适量表面活性剂为原料,采用机械力固相化学反应法制备磷酸盐绿色荧光粉,用XRD和TG DTA分析技术,研究球磨过程和煅烧过程中的物相变化,用扫描电镜和粒度分析对材料的形貌、粒径进行表征。用荧光光谱分析样品的发光性能。研究结果表明,随着球磨时间的增加,有助于产物的晶化,但其结晶程度较低,煅烧后则形成晶型完整的稀土正磷酸盐荧光粉,所得样品为亚微米级的球型绿色荧光粉,在272nm紫外线激发下发绿色荧光,发射主峰在548nm。

基于组合评价方法的绿色性焊接工艺规划评价研究

结合焊接工艺的特点,确立由时间T、质量Q、成本C、资源消耗R、环境影响E五个方面构成的绿色性焊接工艺规划评价指标体系,并在此基础上,建立一种将熵权法、模糊评价法分别作用于评价过程中各个阶段的组合评价方法,该方法能较好地避免评价过程中的主观性和不确定性,最后通过实例验证该方法的科学性和可行性。

健全因地制宜发展新质生产力体制机制推动中国式现代化

党的二十届三中全会决议明确指出:“要健全因地制宜发展新质生产力体制机制”,这对于推动中国式现代化具有重大意义。习近平总书记创造性提出“因地制宜发展新质生产力”,这是一项重大理论和实践创新,将为我国高质量发展注入全新动力。为了深入学习贯彻党的二十届三中全会精神,加快形成同新质生产力更相适应的生产关系,健全因地制宜发展新质生产力体制机制,完善战略性产业发展政策和治理体系,建立未来产业投入增长机制,完善促进数字经济和智能经济发展政策体系,促进耐心资本和各类先进生产要素向发展新质生产力集聚,围绕“健全发展新质生产力体制机制推动中国式现代化”这个新时代经济发展的重要课题,本刊邀请国内著名专家、学者,撰写一组笔谈文章,以飨读者。

Analysis of Current Research and Future Development Trends of Applying Solar Energy in Street Lighting

In the context of promoting green energy transition and addressing climate change globally,solar energy,as a clean and renewable energy source,has gradually become a hot topic for research.Solar streetlight systems realize energy self-sufficiency and environment-friendly lighting by integrating photovoltaic power generation technology and efficient LED lighting technology.By comprehensively analyzing the current status of the application of solar streetlights at home and abroad,this paper discusses its technical advantages,market penetration,and challenges in its development.In terms of technical characteristics,this paper focuses on analyzing the key technologies such as energy conversion efficiency and intelligent control systems of solar streetlights.

“Go Green”—The New Mantra

Rising temperatures are causing melting of glaciers around the world.ShivaLingam,the most sacred pilgrimages of the Hindus,which formed naturally for thousands of years has melted due to unusual hot climatic conditions.In Indian tradition,the Earth is worshipped as the compassionate Mother Goddess. We need to take urgent affirmative collective measures as we have only"One Earth to Live On".

发掘开发竹叶青养生黄酒的工艺设想

为跟上现代人对酒类消费理念的变化,使竹叶青酒具有保健养生的功能,对它进行了工艺改进。在原料选用上除采用以竹叶为主外,还辅以枸杞子、红枣、葛根和桑葚子等“药食同源”的植物料;在酒基上选择了陈年优质低度糯米生麦曲黄酒。在加工工艺上,对植物料的提取采取生物酶解、热回流提取、真空浓缩等提取新工艺。在产品的外观设计上既突出历史性、反映传统民族的风格,又有时代气息,符合人们新的审美观点。

Assessment of Physico-Chemical and Microbial Quality of Sugarcane Juice Sold by Street Vendors in Three Regions of Bangladesh

Sugar cane juice is a popular refreshing drink in most part of Bangladesh. It has great taste and health benefits;also it is available most of the public places at reasonable prices which consumed by road side customers including general public, shopping personals, tourists, students. In our country, street vendors crushing sugarcane between roller crusher and sold without any heat treatment or preservative, also served with or without added ice and lemon juice. The study aimed to identify and compare the physico-chemical and microbial quality of sugarcane juice. The chemical qualities of juices including moisture, PH, ash, total soluble solid, total sugar, reducing sugar and titrable acidity were found slightly different in Mymensingh, Gazipur and Narayangonj areas. The highest and lowest value of moisture, ash, PH, total soluble solids, total sugar, reducing sugar and titrable acidity were found in 84.33% - 79.26% (Gazipur-Mymensingh), 0.57% - 0.04% (Mymensingh-Gazipur), 5.9 - 2.9 (Gazipur-Narayangonj), 17.48% - 4.98% (Mymensingh-Narayangonj), 21.9% - 6.56% (Mymensingh-Gazipur), 3.7 - 2.1 (Gazipur-Mymensingh) and 0.523% - 0.007% (Narayangonj-Gazipur) respectively. For microbiological analysis, the total viable count of sugar cane juice in Mymensingh, Gazipur and Narayangonj were ranged from 0.6 × 105 - 43.6 × 105 cfu/ml, 4.6 × 105 - 21.6 × 105 cfu/ml and 3.6 × 105 - 36.6 × 105 cfu/ml respectively, where the permitted value is 1.0 × 104 cfu/ml, whereas the total coliform count was ranged from 0.4 × 105 - 6.4 × 105 cfu/ml, 0.6 × 105 - 8.4 × 105 cfu/ml and 0.00 - 8.4 × 105 cfu/ml, where the permitted value is 100 cfu/ml and total fungal count was ranged from 5.5 × 105 - 56.5 × 105 cfu/ml, 21.5 × 105 - 54.5 × 105 cfu/ml and 32.5 × 105 - 68.5 × 105 cfu/ml, where the permitted value is 1000 cfu/ml. According to the Gulf standard, the microbiological parameters of all the collected sugar cane juice were out of the permitted standards, so that a serious health outbreak can be caused anytime.

裂解炉设计方案的整体优化

回顾了裂解炉的发展历史并提出了大型化、绿色化的趋势;指出裂解炉大型化可以降低炉子投资并提高备用系数;裂解炉绿色化尤其是解决三废、噪音、温室效应等的设计理念可以应用到大型裂解炉的工艺设计中。通过用“整体不等于部分之和”原理分析裂解技术并指出毫秒炉、燃气轮机、高热效率等“部分”最佳的先进工艺技术在“整体”上却不是最优的设计方案,从而为裂解炉工艺优化设计提供了可持续发展和绿色化学的理论指导。裂解炉整体优化设计的思路完全可以运用在改造已建裂解炉和新建大型绿色裂解炉工程设计以及EPC和PMC中,从而使裂解工艺成为绿色的催化与环境友好的化学工艺,以进一步增加乙烯生产能力,降低裂解炉的基建投资和日常操作成本并提高企业的市场竞争力。