Research Progress on the Influencing Factors and Preventive Interventions of Iron Deficiency

Iron is an important element that maintains the normal operation of the body.It not only participates in various physiological reactions as a component of various enzymes,but also is an indispensable component in the synthesis of hemoglobin(Hb)and myoglobin,which transport oxygen.About two-thirds of the iron in the body is stored in the Hb of red blood cells,with a small amount present in myoglobin in muscle tissue and enzymes required for various metabolic reactions.The remaining amount is mostly in the form of ferritin as a mobilized iron reserve.When dietary iron intake is limited and the stored iron in the body is insufficient or depleted,iron deficiency occurs.Iron deficiency can be further divided into three stages based on their severity,namely iron deficiency(ID),iron deficiency erythropoiesis(IDE),and iron deficiency anemia(IDA).This study aims to explore the prevalence,diagnosis and differentiation,influencing factors,and preventive interventions of iron deficiency.

Study on Influencing Factors and Control Points of Design Estimate of Landscaping Engineering

In recent years,China’s landscaping projects have developed vigorously,and the growth rate of urban garden green space areas has been maintained at about 5%.Overall,with the development of the national economy and the support of macro policies,people’s demand for close to nature and beautify the environment is gradually increasing,which has brought new growth momentum for the development of the landscaping industry.Simultaneously,from the perspective of future economic development and urban development,the landscaping industry still has a lot of room for development.However,with the rapid development of landscape engineering,the problem of cost control of landscape engineering is becoming more prominent,the phenomenon of budget overestimation is common,and there are many factors affecting the cost of landscape engineering,which brings difficulties and challenges to the analysis of its influencing factors and cost management.How to scientifically analyze the influencing factors and control the cost has become an important link in the landscaping project.To solve the above problems,this paper takes the design stage of landscaping engineering as the background,takes the design estimate of landscaping engineering as the research object,through literature research and data collection,fully excavates the main influencing factors of the design estimate stage of landscaping engineering,analyzes the key points of cost control,and provides reference ideas and directions for the later cost management and control.

Research Progress and Prospects of Total Factor Productivity in the Construction Industry

The high-quality development of the construction industry fundamentally stems from the significant improvement of total factor productivity.Therefore,it is of crucial significance for promoting the development of the construction industry to a higher level by scientifically and accurately measuring the total factor productivity of the construction industry and deeply analyzing the influencing factors behind it.Based on a comprehensive consideration of research methods and influencing factors,this paper systematically reviews the existing relevant literature on total factor productivity in the construction industry,aiming to reveal the current research development trend in this field and point out potential problems.This effort aims to provide a solid theoretical foundation and valuable reference for further in-depth research,and jointly promote the continuous progress and development of total factor productivity research in the construction industry.

Analysis of Influencing Factors of Pine Wood Nematode Disease in Lu an City Based on GIS

[Objectives]The paper was to figure out the distribution of Monochamus alternatus in the stumps of pine wood nematode infected wood in Lu'an City and to provide a theoretical and practical basis for differentiated prevention and control of pine wood nematode disease in the future.[Methods]The factors influencing the number of epidemic small classes and infected plants in all counties and districts of Lu'an City were analyzed by GIS method,and the number of worms and wormholes of M.alternatus inside and outside the stumps of pine wood nematode infected wood in Lu'an City were investigated on the spot.[Results]There were 98,40,54,781,193,268 and 34 epidemic small classes of pine wood nematode disease,and 7241,6099,9532,39161,11079,49876 and 4853 infected plants in Yu'an District,Jin'an District,Yeji District,Shucheng County,Huoshan County,Jinzhai County and Huoqiu County,respectively.Pine wood nematode disease in Lu'an City mostly occurred in Huoshan County,Shucheng County and Jinzhai County,with relatively high altitude,paddy soil,the annual precipitation higher than 2062 mm,and the annual average temperature lower than 16.2℃.The number of diseased plants of pine wood nematode disease was positively correlated with altitude and annual precipitation,and was negatively correlated with annual average temperature.The number of worms and wormholes in pine wood nematode infected wood was very small at different altitudes,stump heights and stump diameters.[Conclusions]The pine wood nematode infected wood can be differentially processed after stump treatment,and stumps can be peeled.The results will provide a theoretical and practical basis for differentiated prevention and control of pine wood nematode disease in the future.

Stability influence factors analysis and construction of a deep beam anchorage structure in roadway roof

Deep beam anchorage structures based on spatial distribution analysis of the cable prestressed field have been proposed for roadway roof support, Stability and other factors that influence deep beam structures are studied in this paper using mechanical calculations, numerical analysis and field measurements, A mechanical model of deep beam structure subjected to multiple loading is established, including analysis of roof support in the return airway of S1203 working face in the Yuwu coal mine, China, The expression of maximum shear stress in the deep beam structure is deduced according to the stress superposition criterion, It is found that the primary factors affecting deep beam structure stability are deep beam thickness, cable pre-tension and cable spacing, The variation of maximum shear stress distribution and prestressed field diffusion effects according to various factors are analyzed using Matlah and FLAC3DTM software, and practical support parameters of the S1203 return airway roof are determined, According to the observations of rock pressure, there is no evidence of roof separation, and the maximum values of roof subsidence and convergence of wall rock are 72 and 48 mm, respectively, The results show that the proposed roof support design with a deep beam structure is feasible and achieves effective control of the roadway roof,

Influencing Factors and Biological Control of Aflatoxin Contamination in Peanuts

Peanut is an important economic crop and oil crop in China.It is vulnerable to infection by Aspergillus flavus during production,storage,transportation and processing,causing aflatoxin(AFT)contamination.This paper introduced the status and characteristics of AFT contamination in China,analyzed the infection pathways and influencing factors of A.flavus,and discussed the prevention and control technology of AFT contamination in peanuts from the view of the use of beneficial microorganisms.

Factors Influencing Bacterial Canker Disease of Kiwifruit and the Control Countermeasures

Survey was conducted to investigate the occurrence laws of bacterial canker disease of kiwifruits in Liupanshui area, Guizhou Province, and the patho- gens and hazard symptoms of the canker disease were introduced. The results showed that the factors influencing the occurrence of bacterial canker disease of ki- wifruit were identified as inter-species resistance, agronomic traits, meteorological and ecological conditions, cultivation and management techniques and fertilization levels. Techniques for the comprehensive control of kiwi canker disease were stated, and control suggestions were proposed.

Empirical Research on Influence Factors of "Leading Enterprise + Farmer" Channel Stability-Taking Personal Relation as the Regulated Variable

In the cooperation model of leading enterprise + farmer,channel stability is always a prominent problem. Based on previous researches,taking farmers in Hainan region as investigation object,the influence factors of channel stability of leading enterprise + farmer are studied by combining the background of formal contract and using the combination method of theory and demonstration. Contract item design,trading cost,product specificity,power structure,information asymmetry and social relationship are contained in analytic framework to establish theoretic model. Research results show that in formal channel management,when contract clause design is more explicit,product specificity is stronger,power structure is more balanced,information share degree is higher,and trading cost is lower,channel is more stable,and farmer's willing to renew contract is stronger. Meanwhile,social relationship plays stronger regulation role.

Factors influencing HIV infection in men who have sex with men in China

To identify risk factors for HIV infection among men who have sex with men （MSM） and to provide a theoretical basis for prevention interventions. Between December 2011 and August 2012, a case-control study was conducted among MSM who underwent voluntary counselling and testing for HIV. Confirmed HIV-positive MSM were included in the case group, and HIV-negative MSM were included in the control group. Information on possible risk factors was collected by a survey questionnaire and a qualitative interview. The results of a conditional logistic regression showed that the following were influencing factors for HIV infection： average monthly income between 2001 and 3000 Yuan （odds ratio （0R）=6.341, 95% Ch 1.714-12.544）, only sometimes using condoms when having anal sex with men in the last 6 months （0R=7.601, 95% Ch 1.359-23.083）, having HIV-positive sex partners （0R=5.273, 95% Ch 1.572- 17.691）, rectal trauma with bleeding in the last 6 months （0R=2.947, 95% Ch 1.308-6.638）, not using condoms at last sexual encounter （OR-- 1.278, 95% Ch 1.012-5.595）, engaging in commercial sex （0R=5.925, 95% Ch 1.923-13.890） and having more than 16 sex partners in the last 6 months （0R=1.175, 95% Ch 1.021-1.353）. These seven factors were the risk factors of HIV infection （OR〉l）. However, having anal sex less than 10 times in the previous 1 month （OR=O.O02, 95% CI： 0.000-0.287） was a protective factor against HIV infection among MSM （OR〈l）, and insertive （0R=0.116, 95% Ch 0.000-0.236） （OR〈l） anal intercourse influenced HIV infection. Interventions should be targeted at MSM whose average monthly income is between 2001 and 3000 Yuan, and who engage in commercial sex. In addition, the importance of using condoms at every sexual encounter should be emphasised in health education, as should the treatment of rectal trauma with bleeding. Finally, MSM should decrease the number of sex partners and frequency of anal sex to decrease the rate of HIV infection.

Wellbore-heat-transfer-model-based optimization and control for cooling downhole drilling fluid

To address the two critical issues of evaluating the necessity of implementing cooling techniques and achieving real-time temperature control of drilling fluids underground in the current drilling fluid cooling technology,we first established a temperature and pressure coupled downhole heat transfer model,which can be used in both water-based and oil-based drilling fluid.Then,fourteen factors,which could affect wellbore temperature,were analyzed.Based on the standard deviation of the downhole temperature corresponding to each influencing factor,the influence of each factor was quantified.The influencing factors that can be used to guide the drilling fluid's cooling technology were drilling fluid thermal conductivity,drilling fluid heat capacity,drilling fluid density,drill strings rotation speed,pump rate,viscosity,ROP,and injection temperature.The nondominated sorting genetic algorithm was used to optimize these six parameters,but the optimization process took 182 min.Combining these eight parameters'influence rules with the nondominated sorting genetic algorithm can reduce the optimization time to 108 s.Theoretically,the downhole temperature has been demonstrated to increase with the inlet temperature increasing linearly under quasi-steady states.Combining this law and PID,the downhole temperature can be controlled,which can reduce the energy for cooling the surface drilling fluid and can ensure the downhole temperature reaches the set value as soon as possible.

Mechanics criterion and factors affecting overburden stability in solid dense filling mining

The effect of controlling strata movement in solid filling mining depends on the filling rate of the goal. However, the mechanical property of the overburden in the backfill stope and the designed size of the backfill mining workface should also be considered. In this study, we established a main roof strata model with loads in accordance with the theory of key strata to investigate the stability of the overburden in solid dense filling mining. We analyzed the stress distribution law of the main roof strata based on elastic thin plate theory. The results show that the position of the long side midpoint of the main roof strata failed more easily because of tensile yield, indicating that this position is the area where failure is likely to occur more easily. We also deduced the stability mechanics criterion of the main roof strata based on tensile yield criterion. The factors affecting the stability of the overburden in solid dense filling mining were also analyzed, including the thickness and elasticity modulus of the main roof strata, overlying strata loads, advanced distance and length of workface, and elastic foundation coefficient of backfill body. The research achievements can provide an important theoretical basis for determining the designed size of the solid dense filling mining workface.

Indoor air particles in research vessel from Shanghai to Antarctic: Characteristics, influencing factors, and potential controlling pathway

Despite millions of seafarers and passengers staying on ships each year, few studies have been conducted on the indoor air quality inside ship hulls. In this study, we investigated the levels and size distribution of indoor particulate matter during two cruises of the research vessel “Xuelong” from Shanghai to Antarctica. The results showed that the particle size less than 2.5 μm(PM_(2.5)), and particle size less than 10 μm(PM_(10)) concentrations in different rooms of the ship widely varied. We observed high particulate matter(PM) levels in some of the rooms. The mass concentration distribution was dominated by 1–4 μm particles, which may have been caused by the hygroscopic growth of fine particles. The dominant factors influencing PM concentrations were indoor temperature, relative humidity, and human activity. We quantified contributions of these factors to the levels of indoor particles using a generalized additive model. In clean rooms, the levels of indoor particles were controlled by temperature and relative humidity, whereas in polluted rooms, the levels of indoor particles were mainly influenced by temperature and human activity, which implied that controlling temperature and human activity would efficiently reduce the levels of indoor particles.

冲击地压主控因素及孕灾机制

随着我国煤矿逐步向深部开采转移,冲击地压灾害日趋严重。在冲击地压从机理认知走向防冲工程进程中,首要的任务是厘清冲击地压孕灾主控因素,并进行风险程度判识。在上百个冲击地压矿井致灾评价分析基础上,提出了导致冲击地压发生的4类客观主控因素:煤岩冲击倾向性、开采深度、坚硬顶板、地质构造,以及3类人为主控因素:煤柱、采空区及采掘卸荷,并对各主控因素对冲击地压孕灾的力学机制进行了分析讨论。在客观主控因素方面,煤岩冲击倾向性是煤岩积聚变形能进而诱发冲击破坏的自身属性;开采深度与巷道围岩内积聚的变形能呈正相关关系,是冲击地压发生的必要条件;坚硬顶板大尺度周期断裂形成的冲击动载及动能是诱发冲击地压的“导火索”;地质构造对冲击地压的影响显著,对于断层构造而言,断层两盘将在开采扰动造成的突发卸荷影响下产生相对“回弹”;煤层变薄区等效弹性模量变大,超前支承压力呈“双峰值”分布,使得冲击影响范围扩大。在人为主控因素方面,煤柱作为高应力集中区,其尺寸、倾角及相对位置等将直接影响冲击地压发生的概率和强度;采空区会诱发超前支承压力集中区内围岩积聚弹性能的突然释放,尤其是在采高较大、顶板垮落不充分的情况下;采掘卸荷会导致应力集中区快速“迁移”,引发煤体内弹性应变能的大量释放,是造成冲击地压的重要外因条件。在此基础上,对山东新汶、山东鲁西、内蒙古鄂尔多斯、陕西彬长、新疆和甘肃等矿区冲击地压孕灾主控因素差异性,进行了对比分析,强调按层次对矿井、采区和工作面进行冲击地压主控因素及其影响程度判识重要性,构建了从降能、释能、阻能到抗能的冲击地压治理工程路径。

南京市居民癌症核心知识知晓率及其影响因素研究

目的 了解南京市居民癌症防治核心知识知晓情况及其影响因素,为今后癌症科普宣教方案制定提供参考依据。方法 2021年9—12月在南京12个区采用多阶段分层与人口规模成比例的概率抽样(Probability Proportion to Size,PPS)方法随机抽取15~69岁且在南京本市居住6个月以上的居民作为调查对象,利用《中国居民癌症防治素养调查量表》收集调查对象一般人口学信息、癌症防治核心知识等信息,采用多重线性回归模型分析调查对象癌症核心知识知晓的影响因素。结果 本研究研究对象共纳入3985人,其中男性1756人(44.07%),主城区居民2029人(50.92%),15~35岁、36~45岁和46~69岁者分别占比:37.39%、28.23%和34.38%。癌症防治核心知识中癌症认知、预防、早诊早治、管理、康复5个维度知晓率均达到70.00%。南京市癌症防治核心知识知晓率为80.18%,女性高于男性(82.59%vs 77.11%);主城区居民高于非主城区居民(82.11%vs 78.17%),多因素Logistic回归分析显示:其他民族(OR=0.468,95%CI:0.244~0.898)、初中/高中(OR=1.500,95%CI:1.164~1.932)、大专及以上(OR=2.115,95%CI:1.583~2.825)、机关/事业单位(OR=2.243,95%CI:1.782~2.824)、企业/商业人员(OR=1.477,95%CI:1.173~1.860)、已婚(OR=1.568,95%CI:1.255~1.960)、自评健康状况差(OR=0.342,95%CI:0.195~0.601)、以前吸烟(OR=1.874,95%CI:1.314~2.672)、从不吸烟(OR=1.719,95%CI:1.440~2.051)、无癌症家族史(OR=0.773,95%CI:0.660~0.906)是居民癌症防治核心知识知晓率的影响因素(P均<0.05)。结论 南京市居民癌症防治核心知识知晓率为80.18%,达到《健康中国行动(2019—2030年)》中“癌症防治核心知识知晓率” 2022年70.00%的目标值,今后应针对薄弱环节加强宣传力度,提升南京居民癌症核心知识知晓水平。

糖尿病视网膜病变进展的影响因素

目的:分析影响糖尿病视网膜病变(DR)进展的相关因素。方法:回顾性收集非增殖期糖尿病视网膜病变(NPDR)患者同时进行随访观察,将队列中由NPDR进展为增殖期糖尿病视网膜病变(PDR)的患者共77例作为队列中的疾病进展组,未进展为PDR的NPDR患者共115例作为队列中的观察组进行巢式病例对照研究,比较NPDR与PDR两组一般资料及实验室指标;以一般资料及实验室指标作为自变量,PDR作为结局变量,对DR进展的影响因素进行回归分析;最终对DR进展的影响因素进行诊断试验评价。结果:PDR组较NPDR组年龄更小(P=0.001)、糖尿病病程更长(P=0.01)。实验室指标对比:PDR组中糖化血红蛋白(HbA1c)(P=0.001)、血尿素氮(BUN)(P=0.003)、血沉(ESR)(P<0.001)及同型半胱氨酸(HCY)(P=0.001)明显高于NPDR组,平均红细胞血红蛋白(MCH)(P=0.043)、平均红细胞血红蛋白浓度(MCHC)(P=0.002)明显低于NPDR组。影响DR进展的因素:HbA1c(OR=1.587,P<0.001),BUN(OR=1.456,P=0.008),MCH(OR=0.540,P=0.038),ESR(OR=1.122,P=0.005),HCY(OR=1.838,P=0.002)。采用ROC曲线分析确定DR进展影响因素的最佳诊断分界点:HbA1c为8.18%,BUN为5.46 mmol/L,ESR为8.93 mm/h, HCY为13.95μmol/L。结论:HbA1c、BUN、MCH、ESR、HCY是DR进展的影响因素,其中HbA1c、BUN、ESR、HCY是DR进展的危险因素,MCH是DR进展的保护因素。

尖锐湿疣患者恐惧疾病进展现状及影响因素

目的探讨尖锐湿疣患者恐惧疾病进展现状及相关影响因素。方法采用便利抽样法,选取从2021年12月至2023年1月在郑州大学第一附属医院确诊为尖锐湿疣的263例患者。采用患者一般资料调查表、中文版恐惧疾病进展简化量表、中文版痛苦表露指数量表、心理弹性量表简表等进行调查,使用SPSS 25.0中Spearman秩相关分析和多重线性回归分析影响尖锐湿疣患者恐惧疾病进展的相关因素。结果患者恐惧疾病进展得分为(38.21±5.64)分,心理弹性得分为[73.00(65.00,77.00)]分,自我表露得分为[35.00(31.00,39.00)]分,患者的心理弹性水平、自我表露水平、确诊时间、是否首次治疗是影响患者恐惧疾病进展水平的相关因素。结论关注病程较长的患者,在首次治疗时进行干预,促进患者自我表露,提高心理弹性水平,降低患者疾病进展的恐惧感。

窄条带状背斜油藏边部注水开发产能影响因素

JY油田Y油藏为典型窄条带状背斜油藏,其储集层注入水极易沿河道中心方向突进,导致油井快速水淹,产量递减快;由于对水体大小、构造幅度、储集层物性等产能影响因素认识不清,此类油藏开发难度较大。针对上述问题,建立了窄条带状背斜油藏精细数值模型,通过对比论证提出了“边部注水+逐步转注”开发,并在此基础上开展了水体大小、构造幅度、储集层物性等参数对产能的影响研究。结果表明:“边部注水+逐步转注”开发不仅可以增大边水能量,使得井网双向受效,还可以有效延缓构造高部位油井的见水时间,大幅度降低油井含水率。另一方面,在考虑油藏构造特征的前提下,量化了不同影响因素下的产能特征,明确了水体大小、构造幅度、垂向渗透率与水平渗透率之比等参数的合理界限,论证了不同储集层物性下油藏面积的适应性。可为同类型油藏改善注水开发效果提供借鉴。

基于模块化思想的LCC-HVDC改进小信号建模及交互稳定性分析

随着电网换相型高压直流输电(line commutated converter based high voltage direct current, LCC-HVDC)技术的广泛应用,交直流混联电力系统的交互稳定性问题日益突出。首先基于状态空间平均法建立了考虑非线性换相重叠动态过程的LCC换流器传递函数模型。为适应愈加复杂的直流输电系统建模,提出利用模块化思想分别建立LCC-HVDC各子系统小信号模型,并推导了能反映交直流系统和换流器之间电气耦合特性的接口矩阵实现子系统连接,从而模块化建立精确且易于扩展的计及控制链路延时和锁相环输出相位波动的双端LCC-HVDC系统改进小信号模型。最后分析了控制系统参数和控制链路延时对系统小干扰稳定性的影响以及失稳模态的主导因素,揭示了双端LCC-HVDC系统交直流混合谐振机理及送受端交互影响具体过程。研究结果可以为系统参数设计、谐振抑制措施提供理论基础。

考虑泄洪设施闸门控制的水库防洪调度

【目的】水库防洪调度在防汛工作中具有举足轻重的地位,而如何控制泄洪设施闸门是水库防洪调度方案实施的关键。为此,【方法】建立了考虑泄洪闸门调度的水库防洪优化调度模型以实现精细化调度,并提出一种两层嵌套算法对模型进行求解。在内层建立了包括所有泄洪闸门可行组合的泄洪闸门组合表,外层采用POA算法对水库坝前水位和总泄水量进行优化,并通过查询闸门组合表确定各泄洪闸门的运行状态。【结果】澜沧江漫湾水库防洪优化调度的实例分析结果表明:所提出的两层嵌套方法计算效率较高,对于100年一遇和10年一遇的洪水事件,洪峰分别从12010 m^(3)/s减少到10611 m^(3)/s和从5003 m^(3)/s减少到3351 m^(3)/s,分别减少了11.6%和33.0%,洪水波动幅度分别降低了94.5%和8.8%,极大地缓解了下游防洪压力。此外,与不考虑泄洪闸门调度的传统防洪调度模型相比,所提出的模型能生成更加符合实际、更易于执行的防洪调度方案。【结论】该方法能够实现水库防洪优化调度向泄洪设施运行控制的精细化转变,对于增强防洪优化调度成果的可操作性、提升水库防洪调度管理水平具有一定意义。

颅脑损伤后发生进展性出血性损伤的影响因素分析

目的 通过对比颅脑损伤患者的相关数据,为临床上针对颅内进展性出血性损伤寻找有效的影响因素,以便临床上及时干预提供理论支持。方法 分析90例颅脑损伤患者的临床资料,根据伤后10 h内是否出现颅内进展性出血性损伤分为进展组(n=38)与稳定组(n=52)。比较两组入院时CT征象异常率、发病到入院后首次CT时间、性别、年龄、入院格拉斯哥昏迷评分法(GCS)评分、凝血功能异常率,分析颅脑损伤后发生进展性出血性损伤的影响因素。结果 进展组入院时CT征象异常率76.3%、年龄(48.71±13.61)岁、凝血功能异常率73.7%大于稳定组的5.8%、(41.97±13.37)岁、21.2%,发病到入院后首次CT时间(1.05±0.36)h短于稳定组的(1.58±0.54)h,入院GCS评分(9.92±2.48)分低于稳定组的(11.35±2.71)分,差异有统计学意义(P<0.05)。两组女性占比比较,差异无统计学意义(P>0.05)。以是否发生进展性出血性损伤为因变量,差异有统计学意义的相关因素为自变量,经多因素Logistic回归分析显示:入院时CT征象异常、年龄、入院GCS评分、凝血功能异常是颅脑损伤后发生进展性出血性损伤的独立危险因素,发病到入院后首次CT时间是独立保护因素(P<0.05)。结论 颅脑损伤后颅内进展性出血性损伤的出现可能是由多种因素共同作用的结果 ,临床应重点关注其发生的各种影响因素,有利于预判进展性出血性损伤的发生。