Monitoring Section Research Articles

Experimental and numerical analyses of thermal-hydraulic characteristics of aluminium flying-wing fins

• In general, the flying-wing fin performs better than the wavy fin at the same Re . • The field synergy of the flying-wing fin is much better than that of the wavy fin. • There exist the butterfly-shaped low velocity zones perpendicular to the streamwise direction. • The heat transfer coefficient on the obtuse-angled side of the fin is larger. • Both fin length and fin thickness have little effect on the performance of the fin. The secondary heat transfer surface of the shovel-cut finned tube, called the flying-wing fin, eliminates the thermal contact resistance. In the present study, the thermal-hydraulic characteristics of the flying-wing fin at Reynolds number range of 1500–3000 were studied, including overall quantitative analysis and three-dimensional thermophysical field analysis. It was found that the ratio of Nu · η 0 / f 1/3 of the flying-wing fin (Case A1) is about 8.6% larger than that of the wavy fin (Case B3). The fundamental reason is that the flying-wing fin has a smaller average field synergy angle than the wavy fin. There is a butterfly-shaped low-velocity zone at the root of the wave trough of the monitoring section on the acute-angled side of the flow channel. In addition, along the fin height direction, the influence range of this low-velocity zone on the flow field is less than around 1.34 mm. Similarly, there are butterfly-shaped zones for the temperature and field synergy angle distributions. The average value of the convective heat transfer coefficient on the left side of the flying-wing fin is greater than that on the right side. In general, the promising flying-wing fins show better thermal-hydraulic performances than the wavy fins with similar geometric parameters, which deserve further promotion and engineering application.

Analysis and identification of pollution sources of comprehensive river water quality: Evidence from two river basins in China

• Industry is still the major source of China’s ambient water pollution. • Impact of pollution sources on water quality vary from basin to basin significantly. • Cultivation’s impact on water quality is seasonal. • Cultivation and livestock farming have a cumulative effect on water quality. The identification of the main sources and the impact of the current comprehensive water quality is important in improving the precision and pertinence of water quality management, which will have a significant bearing on the quality of the water environment and the ecological system. This paper focuses on the Yangtze River and Yellow River Basins, employs panel data from 2004–2019 from prefecture-level cities and water quality monitoring sections along the Yangtze and Yellow River main streams, and conducts an empirical study on the effects of pollution sources from cultivation, livestock farming, aquaculture, industry, and domestic activities on the overall water quality. It is found that: (1) Increased pollution from agriculture (cultivation, livestock farming and aquaculture), industry and domestic pollution all contribute to the deterioration of water quality. Industry is still the major source of China’s ambient water pollution. It is then followed by domestic source of pollution and agricultural source of pollution, with the latter having the least impact on water quality. (2) Impact of pollution sources on water quality vary from basin to basin significantly.The main sources of water pollution in the Yangtze and Yellow River Basins are industry and domestic life respectively. Cultivation and aquaculture are the main agricultural sources of water pollution in the two basins respectively. (3) Impact of cultivation pollution sources on water quality is subject to seasonal variations. It means that pollutants from cultivation enter the rivers through the carrying effect of precipitation, and this effect is more often reflected in the busy season. (4) In the long term, the negative impact of cultivation and livestock farming on water quality pollution form a cumulative effect. It grows as the number of lag periods increases. Therefore, in the subsequent environmental pollution control processes, priority should be given to industrial and urban pollution control with more targeted regional pollution management. It is also important to strengthen inter-basin and inter-regional synergistic control, taking top-level design of environmental policies and other conditions of the basin areas into full account to reduce the undesired environmental consequences caused by production.

Penerapan Metode Quota Based Pada Sistem Informasi Monitoring Pendistribusian Bantuan Sapi Berbasis Website

Cattle is one of the most livestock products in Indonesia, therefore to increase the yield of Indonesian livestock, the government has created a cattle assistance program that can help local breeders in improving the quality and commodities, especially cows, the priority of the program is local cattle to be able to compete. with other imported cattle. With this program, an application is made that can help realize the program. The application that is made is the Information System for Monitoring the Distribution of Cattle Aid where this application is devoted to monitoring all aspects related to distribution. The Information System for Monitoring the Distribution of Cattle Aid can support government programs according to the specified target. Because this government program is aid, this application will be able to accumulate distribution results so that it can be evenly distributed according to the data of prospective recipients that have been set and algorithms that help in running it. This application is a first fit algorithm that can assist in inputting and determining memory locations that can be used to accommodate and minimize fragmentation. The Cattle Assistance Distribution Monitoring Information System assists users in checking data efficiently in terms of timeliness and data accuracy. This study aims to understand the flow and use of information systems in the monitoring and distribution section, the method used to design and create an Information System application for Monitoring the Distribution of Cattle Aid is by observation and document study. The application of this information system monitoring the distribution of cattle assistance has had a good impact on the development of livestock, coupled withsophistication technological and assisted farmers in increasing input and development of livestock in the distribution sector.

Review on agricultural non-point source pollution monitoring sections layout and pollutant loading estimation in small watershed

流域尺度面源污染的监测是系统认识农业面源污染的发生、迁移及转化过程, 并对其进行有效控制的重要基础. 当前, 田块尺度的面源污染监测方法比较成熟, 而流域尺度的监测, 尤其是监测断面的布设及采样频率设置等方面的研究较少. 本文详细梳理了小流域采样断面布设、采样频率优化和河流断面通量估算3方面的主要进展. 1)从小流域样点布设来看, 包括常规监测采样设计、针对性监测采样设计和融合前两种类型的监测采样设计3种类型, 点位布设方法上有遗传算法、模糊逻辑法、熵值法和模型法等, 样品采集方式包括随机采样、复合采样、综合采样以及连续采样4种类型, 其中复合采样应用广泛；2)从采样频率来看, 1~2周一次的采样频率即可精准获取污染负荷通量, 若需要进一步提高精度, 可在水文/水质变异大的时期提高监测频率及在特殊断面加密布点；3)在通量估算上, 当前主要的计算方法有平均法、插值法和回归/曲线法3类方法, 其中流量加权的浓度估计法、插值算法和LOADEST法是简便且精确的方法, 方法的选择上也可根据不同时期流域污染源特征进一步优化.;Watershed-scale non-point source pollution monitoring is an important basis for systematically understanding the occurrence, transportation and transformation processes of agricultural non-point source pollution and its effective control. Presently methods monitoring non-point source pollution at field scale are relatively mature, while methods applied at watershed scale, particularly the layout of monitoring section and sampling frequency setting, are rarely studied. This paper reviewed the main progress of sampling section layout, sampling frequency optimization and loading estimation of river sections. From the perspective of sampling layout in small watershed, there are three types of monitoring design including probabilistic design, targeted design and both. Sampling points were located with genetic algorithm, fuzzy logic method, entropy and modelling method, etc. Sample collection methods include random sampling, compound sampling, comprehensive sampling and continuous sampling. Compound sampling is widely used. Concerning the sampling frequency, once every 1-2 weeks is sufficient to obtain accurate pollution loading. If higher accuracy is necessary, the monitoring frequency and special sections can be increased when hydrology/water quality variation is large. For loading estimation, average method, interpolation method and regression or curve method were widely used. Concentration estimation algorithm by flow-weighted, interpolation and LOADEST are simple and exact. Selection of methods could be further optimized based on the characteristics of pollution sources in different periods of the basin.

An Experimental Simulation of Addressing Auto-Configuration Issues for Wireless Sensor Networks

Applications of Wireless Sensor devices are widely used by various monitoring sections such as environmental monitoring, industrial sensing, habitat modeling, healthcare and enemy movement detection systems. Researchers were found that 16 bytes packet size (payload) requires Media Access Control (MAC) and globally unique network addresses overheads as more as the payload itself which is not reasonable in most situations. The approach of using a unique address isn't preferable for most Wireless Sensor Networks (WSNs) applications as well. Based on the mentioned drawbacks, the current work aims to fill the existing gap in the field area by providing two strategies. First, name/address solutions that assign unique addresses locally to clustered topology-based sensor devices, reutilized in a spatial manner, and reduce name/address size by a noticeable amount of 2.9 based on conducted simulation test. Second, name/address solutions that assign reutilizing of names/addresses to location-unaware spanning-tree topology in an event-driven WSNs case (that is providing minimal low latencies and delivering addressing packet in an efficient manner). Also, to decline the approach of needing both addresses (MAC and network) separately, it discloses how in a spatial manner to reutilize locally unique sensor device name approach and could be utilized in both contexts and providing an energy-efficient protocol for location unawareness clustered based WSNs. In comparison, an experimental simulation test performed and given the addresses solution with less overhead in the header and 62 percent fair payload efficiency that outperforms 34 percent less effective globally unique addresses. Furthermore, the proposed work provides addresses uniqueness for network-level without using network-wide Duplicate Address Detection (DAD) algorithm. Consequently, the current study provides a roadmap for addressing/naming scheme to help researchers in this field of study. In general, some assumptions were taken during the work phases of this study such as number of Cluster Head (CH) nodes is 6% of entire sensor nodes, location unawareness for entire sensor network and 4 bits per node address space which considered as the limitation of the study.

Road maintenance monitoring and survey section of highway Pangoda - Pravokhettinsky

Road maintenance monitoring and survey section of highway Pangoda - Pravokhettinsky

Physical Modeling of a Shallow‐Buried Metro Tunnel in the Soft Loess Layer Using Similarity Theory

The special engineering characteristics of loess will inevitably bring hidden trouble to the construction of shallow buried subway tunnel. The purpose of this paper is to investigate the variation law of surrounding rock stress, lining stress, and surface settlement in loess tunnel construction and further explore the optimum construction method in the soft loess area. A model test considering the different excavation methods and prereinforcement measures was conducted to measure the surrounding rock pressure, lining stress, and surface settlement under different working conditions. The results show that the sequence of tunnel excavation had a great influence on the stability of the tunnel. As the experimental steps increased, the surrounding rock stress and lining stress at each monitoring section gradually increase. Especially, stress concentration could easily occur at the arch foot of the tunnel. The pre‐reinforcement measure, especially the WSS grouting, was more crucial than the excavation method. Considering the number of elements, the combination of DSDM excavation method and WSS grouting reinforcement method was proposed as the final construction method of the tunnel in soft loess area in this paper. The research results can effectively guide the design and construction of a shallow tunnel in the soft loess area.

Effects of land use and landscape pattern characteristics on seasonal surface water quality in a typical reticulated river network area—a case study of Liyang City, Jiangsu Province

地表水质受区域景观组成及其空间配置的影响较大，了解景观特征与水质之间的关系可以极大地提高潜在污染的可预测性和污染物输出的评估能力. 以典型网状河网区域(江苏省溧阳市)为例，研究了土地利用和景观格局特征对地表季节水质的影响. 本研究基于2017年每单月从12个监测断面收集的21个水质指标，首先分析了多尺度缓冲区(500、1000、1500、2000、2500和3000 m)内土地利用和景观格局特征，然后通过主成分分析选取12个指标作为主要水质因子，采用冗余分析确定景观因子对水质指标的最佳影响尺度，最后采用偏最小二乘回归(PLSR)探究了最佳影响尺度下景观因子对季节水质的影响. 结果表明，2500 m缓冲区是该区域景观因子对水质指标的最佳影响尺度，旱季大多数水质指标PLSR模型的显著性和预测能力比雨季强. 雨季大多数水质指标都受园地、林草地、散布与并列指数(IJI)和香农均匀度指数(SHEI)的重要影响，并且这些景观因子与除pH和溶解氧浓度之外的其他水质指标均呈负相关. 在旱季，溶解氧、石油类、化学需氧量、总氮和总磷浓度受土地利用的影响最大; 另外，IJI是电导率、硫酸盐和亚硝酸盐氮浓度的最重要影响因子，而SHEI对硫化物和总悬浮物浓度的影响最大. 此外，景观指数对雨季水质的影响更大. 本研究结果揭示了网状河网区域土地利用/景观格局与季节性水质的关系，为区域水环境管理和景观格局优化提供了科学依据.;Surface water quality is greatly affected by regional landscape composition and its spatial configuration. Understanding their relationship can greatly improve the predictability of potential pollution and the evaluation capability of pollutant output. Taking a typical reticulated river network area (Liyang City, Jiangsu Province) as an example, the effects of land use and landscape pattern characteristics on seasonal surface water quality were examined. In this study, 21 water quality indicators were collected from 12 monitoring sections every single month in 2017. Firstly, the characteristics of land use and landscape pattern in multi-scale buffer zones (500, 1000, 1500, 2000, 2500 and 3000 m) were analyzed. Then 12 water quality indexes were identified as the main water quality factors through principal component analysis, and the best impact scale of regional landscape factors on water quality indicators was revealed by redundancy analysis. Finally, partial least squares regression (PLSR) was used to explore the landscape impact on seasonal water quality in the best impact scale. The results showed that 2500 m buffer zone was the best impact scale on water quality indicators. The significance and prediction ability of PLSR models of most water quality indicators were stronger in dry season than that in rainy season. Most water quality indicators in rainy season were significantly affected by orchard land, forest-grass land, dispersion and juxtaposition index (IJI) and Shannon evenness index (SHEI), and these landscape factors were negatively correlated with other water quality parameters except pH and dissolved oxygen (DO). In the dry season, DO, petroleum, chemical oxygen demand, total nitrogen and total phosphorus were most affected by land use. In addition, IJI was the most important impact factor of electrical conductivity, sulfate and nitrite nitrogen, while SHEI had the greatest impact on sulfide and total suspended solids. In addition, landscape metrics had greater impacts on water quality in rainy season. This study revealed the relationship between land use/landscape pattern and seasonal water quality in the reticulated river network area, and provided scientific basis for regional water environment management and landscape pattern optimization.

A STUDY TO EVALUATE MATERNAL AND FETAL OUTCOME IN TERM PREGNANCY WITH MECONIUM STAINED AMNIOTIC FLUID: A PROSPECTIVE OBSERVATIONAL STUDY AT A TERTIARY CARE CENTRE IN INDIA

Background: Globally, 7-22% of all live births are complicated by meconium stained amniotic uid (MSAF). MSAF is considered a predictor of adverse fetal outcome, and meconium aspiration syndrome, a major cause of perinatal morbidity and mortality. This study aimed to nd out the incidence of MSAF and to nd a clinical correlation of neonatal outcome with amnioinfusion and mode of delivery among the study groups. Methods: A prospective observational study was conducted at Sassoon General Hospital, Pune, India from October 2017 to March 2019. 206 patients who fullled the inclusion criteria were studied. Subgroups of with/without amnioinfusion were analyzed in terms of mode of delivery and neonatal outcome. Results: The incidence of MSAF in term pregnancies was found to be 9.13 %. Patients were divided into 2 study groups: thick MSAF and thin MSAF. 76.2% of patients were managed with amnioinfusion. A signicant reduction in the number of cesarean sections observed among patients with thick MSAF. A signicant improvement in APGAR score was observed in newborns with amnioinfusion for thick MSAF. There was a decrease in neonatal intensive care unit stay, neonatal morbidity and mortality. Conclusion: Taking the risks of MSAF into consideration, a trial of labour should be given where continuous electronic fetal monitoring and emergency cesarean section facilities are available. Amnioinfusion decreased the rate of emergency cesarean section and improved the APGAR score in patients with thick MSAF.

High-Performance Computational Early Warning Analysis of Agricultural Economy Relying on Binary Fuzzy Cluster Analysis Algorithm

In this paper, a binary fuzzy cluster analysis algorithm is used for an in-depth study and analysis of high-performance computational early warning in the agricultural economy. The definition of interval type-two fuzzy set and its operation are summarized. Considering the uncertain information that will be encountered in the evaluation process, this paper constructs the evaluation model of rural informatization construction performance based on interval type-two fuzzy numbers, which improves the accuracy of the evaluation results. The fuzzy clustering centres are modified according to the nature of the fuzzy clustering centre matrix, and the optimal fuzzy clustering centres and optimal fuzzy clustering division matrix with consistent order are solved. Using the level eigenvalues to find out in the abundant water period, there are 4 monitoring sections of water quality evaluation results for still clean and 5 monitoring sections of water quality evaluation results for slight pollution. In the flat-water period, there are 2 monitoring sections of the water quality evaluation results that are still clean and 7 monitoring sections of the water quality evaluation results are slightly polluted. In the dry water period, the water quality evaluation results of the 9 monitoring sections are slightly polluted. The results and the use of integrated pollutant index evaluation method results are consistent, indicating that the use of fuzzy clustering model for water quality evaluation is practical and effective. Its functional structure includes management business, innovation business, service business, production business, and operation business functions, in addition to the design of the collection and storage scheme based on Hadoop data warehouse, to achieve accurate matching of information of science and technology agricultural services in the whole agricultural industry chain. Finally, the implementation and maintenance of the cloud-based science and technology agricultural service information system are deployed, and the operational effects of its information system-related functions are demonstrated using prototype design. This paper constructs a comprehensive information system for science and technology agricultural services based on cloud technology that integrates management, innovation, service, production, and operation, which meets not only the needs of traditional science and technology agricultural service information systems, such as expert consultation and training demonstration, but also other needs spawned by the development of agricultural modernization.

Eutrophication trend analysis and forewarning model construction of water source reservoirs: Gaozhou Reservoir, China

AbstractThe eutrophication of water in reservoirs and lakes is worsening year after year and has become a prominent issue of environmental water protection. In order to understand the degree of eutrophication and the changing trend of important drinking water sources in the coastal areas of Western Guangdong, ensuring the safety of drinking water, this paper takes Gaozhou Reservoir as the research object. According to the long‐term monitoring results of eutrophication index of reservoirs from 2012 to 2019, spatial and temporal analysis of each evaluation indicator and the comprehensive nutrient status of the reservoir was conducted using the integrated nutrient status index method. Based on the Weber–Fechner (W‐F) law, an early warning model for reservoir eutrophication and grading evaluation was established. The results showed that Gaozhou Reservoir was in mesotrophic state, and the eutrophication was more serious in the high water period than in the low water period. TLI (TN) was the largest contributor to eutrophication of the reservoir, and all nutritional status indexes show mild eutrophication. Chl‐a, phosphorus nutrients and organic matter had little effect on the degree of eutrophication. The fluctuation of the eutrophication status at each monitoring section of the reservoir was relatively stable. The TLI(Σ) of Liangde Dam was lower than that of the Shigu Reservoir, and the comprehensive nutritional status of the Shigu area in the decreasing order was tail > supply port > centre. According to the established early warning model, the eutrophication status in different seasons from 2012 to 2019 was evaluated. The results indicated that the comprehensive influence index value of the dry period was less than that of the flood period due to the influence of seasonal factors. In addition, the model has a good warning effect; it provides theoretical support and prevention and control methods for ecological environmental protection of reservoirs.

Experimental study on optimization of the initial support structure of super-large section highway tunnel

To improve the economic benefits, on the premise of ensuring the bearing capacity of the initial support, the optimized research on the initial support structure of the super-large section highway tunnel was carried out. Based on the first single-hole four-lane highway tunnel with the largest excavation section in Shandong Province, this paper puts forward a support scheme of optimizing the arch spacing for the initial support and sets up the comparative field test to study the differences between the original scheme and the optimized scheme in bearing mechanical properties and controlling tunnel stability. The tunnel deformation characteristics, surrounding rock pressure release law and arch stress distribution rule of the two support schemes were obtained by monitoring the displacement and stress of different monitoring sections. The results show that compared with the original scheme, the clearance convergence of the optimized scheme is increased by 3.65%, the settlement increased by 5.69%, the surrounding rock pressure increased by 18.34%, and the arch stress decreased by 11.18%. In addition, the maximum stress of the arch is only 49.6% of the yield strength of steel. Both the original scheme and the optimized scheme have enough strength reserve to resist the deformation of surrounding rock and ensure the stability of the tunnel in a short time. This study can provide engineering references for constructing a super-large section highway tunnel under the same condition.

Automation Means for Controlling the Correctness of Typical Sections in a University Teacher's Document

The paper discusses approach to automating the processes of monitoring and editing standard sections in a document of a university teacher in streaming mode. As a toolkit for solving the problem, it is proposed to use the Python programming language with the connection of the python-docx and pandas libraries. Despite the fact that the projected automation tools are focused on a specific task to control documents of a university teacher, the development of the concept of their construction is carried out with an abstraction from the type of documentation. The set of functions may vary depending on the problem being solved. As a result of work on the creation of tools for automating the control of the correctness of typical sections of a university teachers document, a framework of an open software environment for streaming verification of typical sections of documents in the Python language was designed, capable of adapting to the required verification tasks. The project is currently implemented for autonomous operation in Windows OS, it is also expected to be implemented as a web application. For active use in practice for specific tasks, the development of appropriate script packages is required. The main purpose of the development is to release human resources from the routine process of document control and direct it to the implementation of the employees creative ideas.

Buckling Behavior of Thin-Walled Stainless-Steel Lining Wrapped in Water-Supply Pipe under Negative Pressure

This paper presents a study about the buckling behavior of thin stainless-steel lining (SSL) for trenchless repair of urban water supply networks under negative pressure. The critical buckling pressure and displacement (p–δ) curves, temperature changing curves, hoop and axial strain of the lining monitoring section and the strain changes with system pressure (p–ε) of the lining under the action of different diameters, different lining wall thickness and different ventilation modes were obtained through five groups of full-scale tests. The variation principles of the post-buckling pressure and the reduction regularity of the flowing section of the lining were further investigated. By comparing different pipeline buckling models and introducing thin-shell theory, the buckling model of liner supported by existing pipe was established. The comparison between the test results and thin-shell theory indicates that one of the significances of the enhancement coefficient k value is to change the constraint condition of the aspect ratio, l/R, thus increasing the critical buckling pressure of the lining. Finally, an improved lining buckling prediction model (enhancement model) is presented. A previous test is used as a case study with the results showing that the enhanced model is able to predict critical buckling pressure and lobe-starting amount of the liner, which can provide guidance for trenchless restoration of the liner with thin-walled stainless steel.

Water balance computation and water quality improvement evaluation for Yanghe Basin in a semiarid area of North China using coupled MIKE SHE/MIKE 11 modeling

Abstract Water shortage and water pollution are two prominent issues in North China. Understanding hydrological cycle and water quality changes in response to pollution control measures is fundamental for a better water management there. Using coupled MIKE SHE/MIKE 11 modeling, various hydrological components in Yanghe Basin in a semiarid area of North China were quantified for three typical hydrological years and concentrations of COD and TP in a national monitoring section of Yanghe were evaluated with/without pollution control measures. The modeling results show that the underground water storage of Yanghe Basin becomes depleted due to evapotranspiration compensation and groundwater utilization regardless of hydrological condition, indicating an unsustainable in-situ water resource utilization. Water quality goals set for Yanghe (COD ≤ 20 mg/L and TP ≤ 0.2 mg/L) can hardly be achieved if pollution control measures are not taken, especially for a dry hydrological year. Depending on hydrological conditions, non-point source control technology-related projects in a 109-km2 village and a 7-km river-channel wetland in mainstream of Yanghe will have a positive effect or negligible effect on water quality improvement. To meet water quality goals, implementation of three wetlands is an effective and economic way.

Numerical Simulation Research on the Displacement of Ground Connecting Wall in Geological Excavation and Soil Remediation

Monitoring the changes of the retaining pile wall during the excavation of the deep foundation pit, and accurately grasping the side displacement changes of the retaining pile wall can effectively grasp the safety status of the foundation pit construction. In this paper, taking Guangfo Ring Road as an example, theoretical analysis, numerical simulation and other methods are used to study the influence of foundation pit excavation on the horizontal displacement and deformation of the ground connecting wall during the reinforcement of mixed piles in the area adjacent to high-rise buildings. Get the following conclusion : (1) With reinforced ground connecting walls and non-reinforced ground connecting walls, the horizontal displacement curve of ground connecting walls is roughly the same, showing a trend of change between the larger and the smaller ends. As the excavation depth continues to increase, the changing trend of the “bow” becomes more obvious, which is in line with the changing law of the enclosure structure. (2) After the mixing pile is used for reinforcement, the maximum horizontal displacement of the ground connecting wall is greatly reduced. Compared with the case without reinforcement measures, the horizontal displacement value of the ground connecting wall is 5.66mm, which is reduced by 6.23mm. The reduction ratio is 52%, indicating that the mixing pile has a great inhibitory effect on the horizontal displacement of the ground connecting wall. (3) By comparing on-site monitoring and numerical calculation data, the change trend of the wall horizontal displacement of the measured value and the simulated value is approximately the same. The measured maximum value of the monitoring section is 8.46mm, the simulated maximum value is 5.66mm, and the difference between the two is 2.8 mm, verified the rationality of the model, and provided some experience for the excavation of foundation pits to protect adjacent buildings.

OR5. Supportive Heart Failure Care Program: Reducing Hospital Re-admissions at a Visiting Nurse Agency

OR5. Supportive Heart Failure Care Program: Reducing Hospital Re-admissions at a Visiting Nurse Agency

Early Warning and Source Identification System Design for Chemical Spill Incidents of Jinhua River

The key factor in solving frequent chemical spill accidents is how to identify the pollution source information such as discharge location, discharge time and discharge amount or discharge rate, that caused the accident as soon as possible. Furthermore, the diffusion process of pollution accidents is simulated and predicted. Based on the proposed warning model and source identification method, an early warning and identification system for river chemical spill incidences in Jinhua River was designed and developed after collecting the geographic scope of the rivers and the national and provincial monitoring sections of Jinhua River. The system is used to simulate and predict diffusion process of pollution mass, and identify the unknown pollution source information that occurred in the Jinhua River. The early warning and identification system has been applied to the Jinhua River. The results show that the system has higher reliability, and it can provide an intuitive and scientific basis for relevant departments to respond to water pollution accidents and help them to handle pollution accidents quickly, reasonably and economically.

Deformation mechanism and mechanical behavior of tunnel within contact zone: a case study

During the construction of a tunnel passing through a contact zone stratum, the supporting structure is at risk of large deformation, cracking, and collapse, which affects the safety of tunnel construction. Based on the Jiayuan Tunnel project, this study used field monitoring data and numerical simulation to conduct a case study on the support mechanism and deformation of the supporting structure of a tunnel passing through the contact zone stratum. The results obtained for four monitoring sections reveal that the supporting structure under the contact zone stratum receives more surrounding rock pressure compared with the general stratum. In this case, the stress and deformation of the supporting structure are larger. Moreover, the deformation and mechanical behavior were uneven at different parts of the supporting structure. Using the numerical software FLAC3D, the deformation mechanism and mechanical behavior of the supporting structure were analyzed and are related to the surrounding rock parameters and interface location. Combined with the feature of the supporting structure in the contact zone stratum, the supporting structure should be strengthened to avoid stress concentration, while the steel arch foot should receive more attention when the interface coincides with the step surface.

Disturbance Effect of Pipe Jacking Group Adjacent Excavation on Surrounding Soil

Under the modern and complicated urban environment, clarifying the interaction mechanism and mutual influence mechanism between the urban tunnel and the surrounding environment is of considerable significance to the construction and operation of the tunnel. To understand and grasp the excavation-induced disturbance range and mechanism of adjacent pipeline jacking group on surrounding soils, this paper carries out relevant researches. Based on a case history of a three-hole parallel adjacent jacking pipeline in shallow overburden, a field test and assessment are performed. By setting monitoring points around the monitoring section, the earth pressure and water pressure under different buried depths and different spacing are monitored. For further discussion, the general law of soil disturbance around single-hole, double-hole, and three-hole jacking is investigated, the calculation method of lateral disturbance range and overlapping area range of pipe jacking group is deduced, and the degree of soil disturbance is evaluated as well. The results show that there will be different degrees of disturbance superposition in parallel multihole jacking due to the influence of the spacing, and the disturbance intensity is greatly affected by the parallel distance and buried depth.