简介:摘要:G217 线独山子至乔尔玛段第二合同段冻土病害较为严重,主要表现在路基变形沉降,路面破损等方面,给本项目的运营带来极大的安全隐患。查明冻土病害的成因,提出合理的处置方案建议十分重要。通过对该路段的冻土病害专项勘察,本次提出了采用片块石进行换填处理、控制路基填料细颗粒含量、适当增加路基高度的处置建议。
简介:摘要: 本文介绍了无线通信技术的发展史,从第一代无线通信技术到现在的5G,无线通信技术得到了长足的发展,然后本文还介绍了5G网络的结构,最后介绍了5G的网络规划的方法.
简介:摘要:本文基于LTE网络MDT采样数据、4G/5G共站址以及共建共享基础数据,根据5G站点安装完成时间,通过python编写代码算法,计算在5G站点安装完成前后对4G宏站小区的覆盖方位角的覆盖距离发生变化情况,针对变化较大的覆盖异常小区进行核查,确认是否因5G站点安装施工导致4G小区天线方位角、下倾角、位置、高度和环境等发生变化,从而导致4G网络覆盖受到影响。通过对4G网络覆盖变化异常小区及时进行优化调整,使4G网络覆盖与质量保持稳定性,避免出现用户感知差及用户投诉等情况。该方法可及时有效地识别网络变化情况,排查网络隐患,具有良好的推广性与复制性。
简介:摘要:本文以MR、PM流量、高倒流等多维度数据为基础,验证了4G MR利旧偏移预测5G MR、AI预测5G MR的准确性,通过5G MR+4G MR偏移+AI三维协同覆盖预测机制来评估覆盖问题,构建显性弱覆盖、隐性弱覆盖和高价值互补的规划方案策略,实现基于价值的5G精准规划。
简介:摘 要:随着信息技术的不断发展,5G技术获得了较为广泛的应用,促进了广播技术的不断发展。本文对5G广播技术进行了一定的论述,分别从网络架构、帧结构和参数集、无线发射系统以及业务承载能力等方面进行了分析,有助于促进5G广播技术在更大的范围内进行推广应用,对于从事相关工作的技术人员具有一定的借鉴意义。
简介:AbstractBackground:The elimination of Plasmodium vivax malaria requires 8-aminoquinolines, which are contraindicated in patients with glucose-6-phosphate dehydrogenase (G6PD) deficiency due to the risk of acute haemolytic anaemia. Several point-of-care devices have been developed to detect G6PD deficiency. The objective of the present study was to evaluate the performance of two of these devices against G6PD genotypes in Mauritania.Methods:Outpatients were screened for G6PD deficiency using CareStart™ rapid diagnostic test (RDT) and CareStart™ G6PD biosensor in Nouakchott, Mauritania, in 2019-2020. African-type and Mediterranean-type G6PD genotypes commonly observed in Africa were determined by polymerase chain reaction-restriction fragment length polymorphism and sequencing. Qualitative variables were compared using Fisher’s exact test.Results:Of 323 patients (74 males and 249 females), 5 males and 2 homozygous females had the African-type A-genotype: A-(202) in 3 males and 2 females and G6PD A-(968) in 2 males. Among heterozygous females, 13 carried G6PD A-(202), 12 G6PD A-(968), and 3 G6PD A-(542) variants. None had the Mediterranean-type G6PD genotype. Eight had a positive G6PD RDT result, including all 7 hemizygous males and homozygous females with A- or A-A- (0.12 to 2.34 IU/g haemoglobin, according to G6PD biosensor), but RDT performed poorly (sensitivity, 11.1% at the cutoff level of < 30%) and yielded many false negative tests. Thirty-seven (50.0%) males and 141 (56.6%) females were anaemic. The adjusted median values of G6PD activity were 5.72 and 5.34 IU/g haemoglobin in non-anaemic males (n = 35) and non-anaemic males and females (n = 130) with normal G6PD genotypes using G6PD biosensor, respectively. Based on the adjusted median of 5.34 IU/g haemoglobin, the performance of G6PD biosensor against genotyping was as follows: at 30% cut-off, the sensitivity and specificity were 85.7% and 91.7%, respectively, and at 80% cut-off, the sensitivity was 100% while the specificity was 64.9%.Conclusions:Although this pilot study supports the utility of biosensor to screen for G6PD deficiency in patients, further investigation in parallel with spectrophotometry is required to promote and validate a more extensive use of this point-of-care device in areas where P. vivax is highly prevalent in Mauritania.
简介:摘要:通过对本论文的研究可以从四方面来概括,第一就是空闲态4G跨系统运行时主要存在以下问题,首先是由于网速低导致网络带宽变小;其次是上网费用过高;最后是因为接口过多引起数据流量变化和用户使用习惯改变等原因造成空耗率增加。第二是新技术的应用降低了移动通信业务流程管理效率,也降低了运营成本,同时也会带来很多不利影响比如减少了对原有硬件设备的利用率,使现有资源闲置浪费。由大数据分析可知从用户的角度出发,移动网中5G是其功率最大、电压波动最陡以及频率最高的区域。首先要保证在低频段才能满足需求;其次是流量问题,要充分利用大流量优势,因为由于流量的波动会影响到系统性能和数据传输质量等方面;最后需要考虑是否能够实现资源共享和提高网络效率等问题,并提出解决方法与途径以达到最优效果,此外还需注意的是由于4G系统具有较高的带宽特性,在不同通道中用户所需功率大小不一样,从通信设备、网络稳定性以及抗干扰能力考虑如何提高移动端信号处理速度和可靠性,还有信号强度问题也包括信道衰减等相关因素对多路无线接入网造成影响及安全隐患,从而导致了多通道业务运行不稳定甚至瘫痪现象发生。
简介:摘要:F5G与5G组网共同构筑了一张覆盖天上和地上的网络,同时结合新一代信息技术,为各行各业的智能化和数字化提供了无限的可能。其在煤炭行业特别是在采煤领域,能够发挥的作用也非常巨大,包括工控管理、虚拟现实、视频传输、人员定位、效能管控等多个应用场景,通过搭建这条煤矿智能化建设的高速公路,可以进一步推进煤炭行业生产现场的全自动化作业,为煤炭企业创造更多的价值。