一种基于EPON的家庭网络远程管理框架

家庭网络是运营商网络的延伸,是业务传递过程中的最后一个环节,应该具有运营商网络的特性,即性能稳定、可管理、可维护、有服务质量保证、安全和可扩展。文章结合最新的接入网技术以太网无源光网络（EPON）和数据用户线（DSL）论坛上的远程网络管理协议TR-069,提出了一种基于EPON的家庭网络远程管理框架

EPON无线接入多媒体终端的设计与实现

EPON（以太网无源光网络）作为具有广阔应用前景的光纤接入网技术已经越来越多地应用于接入网系统中。文章提出将WLAN（无线局域网）技术与EPON系统相结合,实现EPON系统的无线接入服务。通过对这两种技术相结合的可行性的理论分析,对所提出系统的架构进行了描述,并通过系统测试验证了所提出系统的可行性和有效性

我国北方地区清洁供暖技术现状与问题探讨

近年来,我国北方地区雾霾天气频发,京津冀地区尤为严重。受经济成本、取暖模式等诸多因素影响,短期内燃烧化石能源仍为北方地区冬季取暖的主要形式。推进我国北方地区冬季清洁取暖工作是中央提出的一项重要战略部署。文章回顾了区域供热技术发展的大致历程,介绍了近10年来国家相关的供热政策,详细比对分析了我国北方现有各项清洁供暖技术的优劣,包括:清洁燃煤供暖、天然气供暖、电制热供暖、地热供暖、生物质能清洁供暖、太阳能供暖、工业余热供暖、核能供暖等,最后对清洁供暖领域存在的关键共性问题进行了深入剖析,并探讨解决路径。为推进我国北方地区清洁取暖工作的可持续发展,建议今后围绕3个方面重点开展工作:(1)逐步建立清洁取暖科学评价体系,从全生命周期角度主要考量能效指标、经济指标和环境影响指标等性能参数;(2)有序推进供热管网节能改造和采暖末端能效提升,逐步健全现有供热系统评价体系,对于供热管网先评估后改造,逐一突破;(3)积极探索多方共赢长效机制,注重顶层设计与协调,加强区域政策配套与完善

我国北方地区清洁供暖技术现状与问题探讨

近年来,我国北方地区雾霾天气频发,京津冀地区尤为严重。受经济成本、取暖模式等诸多因素影响,短期内燃烧化石能源仍为北方地区冬季取暖的主要形式。推进我国北方地区冬季清洁取暖工作是中央提出的一项重要战略部署。文章回顾了区域供热技术发展的大致历程,介绍了近10年来国家相关的供热政策,详细比对分析了我国北方现有各项清洁供暖技术的优劣,包括:清洁燃煤供暖、天然气供暖、电制热供暖、地热供暖、生物质能清洁供暖、太阳能供暖、工业余热供暖、核能供暖等,最后对清洁供暖领域存在的关键共性问题进行了深入剖析,并探讨解决路径。为推进我国北方地区清洁取暖工作的可持续发展,建议今后围绕3个方面重点开展工作:(1)逐步建立清洁取暖科学评价体系,从全生命周期角度主要考量能效指标、经济指标和环境影响指标等性能参数;(2)有序推进供热管网节能改造和采暖末端能效提升,逐步健全现有供热系统评价体系,对于供热管网先评估后改造,逐一突破;(3)积极探索多方共赢长效机制,注重顶层设计与协调,加强区域政策配套与完善

钢铁行业中低温烟气余热相变储热装置特性分析

现阶段中国钢铁行业中低温余热资源总量丰富,但各类余热能级跨度大、温度分布范围宽,并且余热资源存在间歇性与不稳定性,现有技术已无法满足要求。相变储热以其储热密度高、储释热过程温度恒定等优势成为研究热点。该文介绍了利用NaNO_3/SiO_2为相变储热材料,设计制造相变储热实验装置,并对该装置的特性进行分析。实验结果显示,在测试条件下,该套装置储热时最大储热效率为68.3%,放热时最大放热效率约为60%

Transmission line patrols and examines running gear of robot

本实用新型属于输电线路巡检设备，具体地说是一种输电线路巡检机器人行走装置。包括基座、支架、剖分轮、剖分驱动装置、行走驱动装置、左连接板及右连接板，其中支架设置于基座上，所述剖分驱动装置设置于支架上、并与左连接板和右连接板连接，所述左连接板和右连接板通过剖分驱动装置的驱动向相反方向移动；所述剖分轮设置于左连接板和右连接板的端部，所述行走驱动装置设置于左连接板或右连接板上、并与剖分轮连接。本实用新型在剖分轮上线合拢后，行走机构形成一个封闭的空间结构，架空地线位于封闭空间之内，能够防止行走轮或输电线路机器人的脱线

Observational Study on Urinary Status Following HoLEP

We assessed the safety, and postoperative urinary status of holmium laser enucleation of the prostate (HoLEP) for the treatment of benign prostatic hyperplasia (BPH). Of the initial 117 patients who underwent HoLEP from November 2004 to March 2011, 49 were followed up for two years or longer. These 49 patients were evaluated once preoperatively, and at the 3rd, 6th, 12th, 24th, 48th, and 60th month postoperatively using International Prostate Symptom Scores (I-PSS) total and sub-score, quality of life score (QOL), maximum flow rate (Qmax), and post-voiding residual urine volume (PVR). The median estimated transition zone and enucleated volume were 45. 1 and 47. 9 g, respectively. Evaluation scores showed significant improvements throughout the follow-up. I-PSS total scores improved from 21 points (before surgery) to 6 points(12 monthsafter surgery), QOL scoresimproved from 5 points to 2 points, Qmax improved from 6.8 ml/s to 17.4 ml/s, and PVR improved from 101 ml to 26 ml, respectively. Transient urinary incontinence was noted in 14 patients (28.5%). One case showed a Clavien grade 3 complication of postoperative bleeding. No blood transfusion or re-surgery for BPH was required. In conclusion, HoLEP proved to be a safe and effective therapy, with potential to become a new gold standard for treating BPH

Risk Factors for Recurrence in pT3aN0M0 Renal cell Carcinoma According to 2009 TNM Classification

The TNM classification of renal cell carcinoma was updated in 2009. In this new classification system, T3a consists of tumors with renal vein involvement and tumors with fat invasion. To assess risk factors for recurrence, we retrospectively reviewed 89 patients with pT3aN0M0 renal cell carcinoma who underwent radical or partial nephrectomy between 1992 and 2011. Analyzed risk factors for recurrence were age, gender, tumor size, grade, v factor, infiltrative growth (INF), adjuvant interferon, surgical technic (radical or partial), clinical T classification, renal vein thrombus, and pathological fat invasion. The median follow-up was 52.2 months. Five-year recurrence-free survival rate was 69.0%. Within the pT3a subcategory, the five-year recurrence-free survival was 76.7% in patients with fat invasion only, 42.9% in patients with renal vein thrombus only, and 28.6% in patients with the two concomitant features. On univariate analysis, tumor size, grade, INF, clinical T classification, and renal vein thrombus were significantly associated with recurrence. On multivariate analysis, INF (p＝0. 023, HR 3. 927) was an independent risk factor for recurrence. In pT3aN0M0 renal cell carcinoma, INF significantly affects recurrence, and patients with both fat invasion and renal vein thrombus have worst prognosis