Study on the Artificial Snowfall Operation of Silver Iodide Ground Generator in Shijiazhuang City

The key of artificial precipitation(snowfall) operation with the silver iodide generator which was set on the windward slope of mountain was the selection of updraft time.The updraft related to the entering cloud efficiency of effective nucleus.By contrasting and analyzing two times artificial snowfall operations,the timing of artificial precipitation(snowfall) operation with the silver iodide ground generator was discussed.By using the synoptic chart,satellite cloud chart,radar,physical quantity calculation and so on,the operation timing was determined.

Current Situation and Countermeasures of Weather Modification Ground Operation in Heilongjiang Province

Heilongjiang Province is the granary of China,which plays a key role in ensuring the national food security.The total grain output of Heilongjiang Province has ranked first in China for 12 consecutive years.In the past four years,it has been stable at more than 75 billion kg,a record high.One bowl of rice in every nine bowls in China comes from Heilongjiang.The work of weather modification and disaster prevention and reduction is an important measure to ensure the development of agricultural production,and is the key of meteorological services for agriculture.Based on the actual work of artificial weather modification in Heilongjiang Province,this paper analyzes the current situation of ground operation in Heilongjiang Province,studies and judges the safety production,and puts forward reasonable countermeasures.The purpose is to improve the ground operation ability of artificial weather modification and provide safe and scientific services for agricultural production.

Study on Sport Ground Construction and Operation Status Under National Fitness Background

With the nervousness degree of people＇s life pace accelerating and the increasing of work task, human health is increasingly being ignored. In order to improve the national physical health, the state advocates to start national fitness activities. Under this background, each region begins to carry out the construction of the sport ground and conducts fruitful activities. Based on this, the paper has carried out the analysis and research on the construction and operation conditions of the sport ground under the national fitness background.

Usability Analysis of Touch Screen for Ground Operators

The importance of the aircraft is increasing gradually;among them it may be called Ground Control Station (GCS) receiving the highest expectations. In aspect of operation, operator’s workload and working speed are one of the most important factors. Thus, we need to compare Touch mode and Non Touch mode in order to improve workload and working speed. In this paper, we analyzed the differences of Touch mode and Non Touch mode about workload, working speed in operation of aircraft. Through NASA-TLX and Measured working time, quantified data were collected and an analysis of variance (ANOVA) was performed. According to experimental result, working speed and workload according to input mode showed significant difference. In ground operation, Touch mode is better than Non Touch mode about working speed and workload. In the Touch mode, the optimal value of lower display angle was selected as 60。 angle.

The Optimization on Operation Characteristicsof Urban Medium Voltage Network

Traditional small current grounding system has many advantages. Pilot operation shows that optimized one has even better operation characteristics. It has proven to be a geenrallly properand relatively perfect neutyal grounding method in urban MV network.

Intraoperative Care of the Conscious Patient from the Perspective of the Operating Theatre Nurse:A Grounded Theory

Introduction: Intraoperative care includes a unique knowledge of how to perform a safe and effective surgery procedure. Surgery performed under regional or local anaesthesia allows the patient to remain conscious during the procedure and is rather common in Swedish healthcare today. Aim: The aim was to obtain a deeper understanding of the main concerns of operating theatre nurses (OTN) when caring for conscious patients during the intraoperative phase. Methods: Interviews were conducted with 23 OTNs from five different hospitals in Sweden and analysed according to grounded theory. Findings: The main concern among the OTNs was to take the patient in consideration. The core category “achieve and maintain ethical treatment of patients” in the operating theatre (OT) was a strategy used throughout the intraoperative process. Ethical treatment was described as moral behaviour at different levels and included the team’s behaviour, respectful and individualised patientcare, and the working-morale of the professionals. Being vigilant and being flexible were the categories related to the core category. The OTNs constantly assessed where to pay most attention as they balanced between the needs of the patient, the team, and the surgery procedure. Conclusion: It is important that every patient is taken into consideration and that ethical principles are held to the highest standards in the OT. A familiar team can facilitate that. The complex skills that operating theatre nurses develop can be added to explain important competencies within the profession.

Soft ground tunnel lithology classification using clustering-guided light gradient boosting machine

During tunnel boring machine(TBM)excavation,lithology identification is an important issue to understand tunnelling performance and avoid time-consuming excavation.However,site investigation generally lacks ground samples and the information is subjective,heterogeneous,and imbalanced due to mixed ground conditions.In this study,an unsupervised(K-means)and synthetic minority oversampling technique(SMOTE)-guided light-gradient boosting machine(LightGBM)classifier is proposed to identify the soft ground tunnel classification and determine the imbalanced issue of tunnelling data.During the tunnel excavation,an earth pressure balance(EPB)TBM recorded 18 different operational parameters along with the three main tunnel lithologies.The proposed model is applied using Python low-code PyCaret library.Next,four decision tree-based classifiers were obtained in a short time period with automatic hyperparameter tuning to determine the best model for clustering-guided SMOTE application.In addition,the Shapley additive explanation(SHAP)was implemented to avoid the model black box problem.The proposed model was evaluated using different metrics such as accuracy,F1 score,precision,recall,and receiver operating characteristics(ROC)curve to obtain a reasonable outcome for the minority class.It shows that the proposed model can provide significant tunnel lithology identification based on the operational parameters of EPB-TBM.The proposed method can be applied to heterogeneous tunnel formations with several TBM operational parameters to describe the tunnel lithologies for efficient tunnelling.

河南地矿CORS省域地面沉降监测与机理分析

为了进一步研究省域尺度范围地面沉降,分析河南地矿CORS省域地面沉降的监测方法与其形成机理:针对河南省地面沉降分布特征,采用河南省地质信息连续采集运行系统(HNGICS)的62个基准站数据,时间序列为2012—2019年,获得国际地球参考框架下无净旋转条件的河南省三维速度场;然后分解三维速度场获得河南垂直速度场,发现河南省地面沉降呈现“西稳东沉”的现象,开封附近出现沉降漏斗;最后将河南省地质图、河南省耕地面积占比、河南省年均降雨量与沉降等值线对比分析。结果表明:不同地质条件下,河南省地面沉降分布于豫东地区的第四系冲积层,而相同地质条件下,耕地占比和区域年均降雨量是地表差异性沉降的主要原因,如豫东地区耕地约占总面积的70%,地下水用于农业灌溉是豫东平原出现沉降漏斗的主要原因。

新线引入既有客运专线车站软土地基加固技术

以新线引入既有客运专线车站软土地基加固工程为依托,开展布袋注浆桩试桩研究,分析不同浆液配比布袋注浆桩复合地基加固效果,对布袋注浆桩施工工艺、质量检验进行了研究。结果表明:布袋注浆桩机械设备高度低,对既有线影响小,对于空间受限的邻近营业线地基加固工程适用性强;提高单位面积布袋质量、采用桶式钻头引孔等可解决碎石成分类填土地基应用布袋注浆桩技术时遇到的布袋破裂、塌孔等问题。浆液质量配比水泥∶水∶粉煤灰=0.70∶0.55∶0.45时桩身无侧限抗压强度平均值9.6 MPa,加固效果优于高压旋喷桩;采用低应变反射波法检测桩体完整性效果较差,工程应用中应加强桩身取芯检测。

基于TRNSYS模拟土壤源热泵长期运行效果研究

为了分析土壤源热泵长期运行能效及适用情况,针对间歇运行的情况下土壤源热泵对周围环境,尤其是地下土壤温度的影响开展了研究。通过对太原市某办公楼进行建模,利用TRNSYS软件搭建土壤源热泵系统,并模拟房间温度、建筑负荷、设备选型、分析热泵机组COP、地埋管进出水温度变化。进而对该项目进行运行10年效果预测,发现系统运行10年土壤温度由11.2℃降低到8.47℃,埋管进水温度与出水温度均降低。且夏季热泵机组COP升高,冬季热泵机组COP降低,进而分析地源热泵长期运行效果。

医保省级统筹关键要素与运行机制模型构建研究

目的:研究医保省级统筹的关键要素与运行机制,为推动医保省级统筹提供借鉴参考。方法:以贵州省为例,通过访谈,收集以“医保省级统筹”为主题的相关文本资料,运用扎根理论提取并分析关键要素。结果:通过逐级编码,提取医保省级统筹相关概念71个,归纳为17个初始范畴、8个主范畴、5个核心范畴,据此构建医保省级统筹的运行机制模型。结论:聚焦问题靶向,关注目标导向,优化决策,细化执行,强化监管,保障医保省级统筹稳健开展。

航班运行中典型虚假近地警告实例分析及运行建议

可控飞行撞地(CFIT)征候是局方监控事件中频率最高的事件之一,对确保飞行安全至关重要。正确使用增强型近地警告系统(EGPWS)是防止可控飞行撞地最直接有效的办法。本文首先介绍了相关概念和EGPWS功能,其次介绍了相关案例并分析了虚假近地警告类型,最后从飞行员视角提出了运行建议,旨在为航班运行提供避免和正确面对虚假近地警告的思路和方法,保证航班安全运行。

新型动力轻型飞机飞行性能仿真评估

为评估新型动力轻型飞机的飞行安全性,基于民用航空器适航审定理念和方法,选取飞行关键的阶段,应用MATLAB软件模拟该型飞机起飞地面滑跑和起飞爬升性能,计算滑跑距离和爬升率。结果表明混合动力型轻型飞机的起飞地面滑跑距离缩短了10%,爬升性能提高了22%,同时混合动力型飞机对起飞机场的高度和温度环境适应能力也明显提升。该方法可作为混合动力轻型飞机适航审定中验证符合中国民航CCAR-23-R4规章第23.2115条款“起飞性能”和第23.2120条款“爬升”要求的一种方法。

Influence of the Electric Field on the Properties of the Bound Magnetopolaron in GaAs Semiconductor Quantum Wells

The influence of the electric field on the properties of the bound magnetopolaron in an infinite-depth GaAs semiconductor quantum well is investigated using the linear-combination operator and the unitary transformation method. The relationships between the polaron＇s ground state energy and the Coulomb bound potential, electric field, magnetic field, and well-width are derived and discussed. Our numerical results show that the absolute value of the polaron＇s ground state energy increases as the electric field and the Coulomb bound potential increase, and decreases as the well-width and the magnetic field strength increase. When the well-width is small,the quantum size effect is significant.

基于空间异质运算的结构信息提取辅助遥感影像分类研究

以Landsat-8和高分一号数据为例,采用仅有光谱特征、3种纹理特征(概率统计、灰度共生矩阵、空间异质运算)辅助光谱特征的方法提取影像空-谱信息,并通过支持向量机分类器进行基于像元的地物分类。结果表明:1)纹理特征辅助光谱特征的地物分类精度明显优于仅使用光谱特征的分类,可提高8.62%~24.36%;2)相较于概率统计、灰度共生矩阵方法结果,空间异质运算结果分类精度在GF-1影像中分别提高了13.31%和2.03%,在Landsat-8影像中分别提高了11.62%和7.79%;3)对于线状地物,相较于概率统计、灰度共生矩阵方法结果,空间异质运算结果分类精度在GF-1数据中分别提高了29.31%和0.80%,在Landsat-8数据中分别提高了11.90%和6.64%,有效减小了分类误差。因此,空间异质运算提取的空间结构信息辅助光谱特征的分类方法能显著改善遥感图像的分类精度,为空间结构信息辅助遥感影像地物分类及线状地物的提取提供一种新的思路和方法。

面向无人作业的天空地协同网络:需求、挑战、技术变革机遇

在偏远、危险地区,机器人可感知环境、智能交互,协同完成复杂任务。以卫星和无人机为主体的天空地协同网络能够为这些机器人提供全域泛在、随遇接入的通信服务。首先,分析无人作业发展趋势和机器人通信需求。基于此,面向机器人通信的特点,建议跳出“信息传输管道”的传统视角,在支持信息传输的同时,关注信息的内容和价值。进一步综合考虑机器人通信中信息生成的动作及其反馈,提出潜在技术变革的切入点。具体地,从结构化通信资源配置、机器人行为调控和感-传-算-控闭环模型三个方面阐述维纳控制论启发的通信范式变革途径。

中深层套管式地埋管地源热泵系统能效分析

中深层套管式地埋管地源热泵系统的能效受多种因素影响,为保证其高效运行,对其影响因素进行研究尤为重要。本文建立了中深层套管式地埋管地源热泵系统换热器传热模型,采用工程实测数据验证该模型的准确性。基于该模型,量化了一个供暖期内多种因素对系统能效的影响。结果表明:进口水温和岩土导热系数对系统能效具有重要影响,回填材料导热系数对其影响较小;增大循环流量会提高取热功率,但系统能效也随之降低,当循环流量由8.33 kg/s增大至10.56 kg/s时,取热功率提升4.95%,能效下降1.23%;增大外管管径、岩土和回填材料的导热系数能够提升系统能效,但达到一定数值后,对能效提升效果不显著。本研究对中深层套管式地埋管地源热泵系统长期稳定运行及能效提升具有参考意义。

激发粮农增收活力:订单模式运作机制的多案例扎根分析

立足新发展阶段,探索契约农业运作机制对推动小农户与现代农业有机衔接、促进农民增收和农业现代化转型具有重要意义。选取典型水稻主产区作为案例样本点,运用扎根理论质性分析法,借助Nvivo12 Plus对水稻企业、合作社等产业组织进行多案例分析,研究新发展理念下水稻订单模式的运作机制及其对农户增收的影响。研究发现,自然环境、市场环境、政策环境、产业链延伸、价值链增值、协作动力、订单制度安排、绿色生产、绩效增加和农户增收10个主范畴是影响新型农业经营主体发展水稻订单模式的重要因素。继而,以订单模式为中心范畴,构建起“环境—价值(产业)链—协作动力—制度安排—共生共赢”的新型运作机制。最后,立足水稻订单模式发展共生共赢的根本目标,剖析企业绩效增加和农业绿色生产赋能粮农增收的具体路径。

基于Nomogram模型鉴别肺腺癌病理亚型的临床价值

目的 探讨基于最小绝对收缩和选择算子(least absolute shrinkage and selection operator,LASSO)回归分析构建Nomogram模型预测原位腺癌(AIS)、微浸润腺癌(MIA)及浸润性腺癌(IAC)的价值。方法 选取本院97例经手术病理证实且病理亚型明确的肺腺癌患者,将AIS和MIA归为第1组,IAC为第2组,比较两组患者年龄、性别、吸烟史、长径、短径及免疫组化Ki-67等临床医学特征差异,采用3D Slicer软件进行图像分割,特征提取与选择,通过LASSO算法对特征进行降维,筛选影像组学特征构建预测模型。再采用R软件的rms工具包构建Nomogram模型,计算ROC曲线下面积(AUC),以评价Nomogram模型鉴别肺磨玻璃结节病理亚型的效能。结果 1)性别、吸烟史、长径、短径及免疫组化Ki-67等临床医学特征均差异无统计学意义(P>0.05);2)筛选7个CT影像组学特征:平面度、大依赖低灰度强调、小波变换LHL第十百分位、小波变换HLL第十百分位、小波变换最小值、小波变换均值及小依赖低灰度强度比较,差异均有统计学意义(P均<0.05);3)基于CT影像组学特征建立预测肺磨玻璃结节病理亚型的Nomogram模型,训练集中AUC为0.863,准确率为87.9%,灵敏度为67.9%,特异度为91.1%;验证集中AUC为0.792,准确率为75.0%,灵敏度为66.7%,特异度为90.5%,可见此Nomogram模型具有较好的预测效能。结论 对于预测肺腺癌浸润程度,Nomogram模型具有明显优势,可作为一种鉴别手段。