Deterioration Reason and Improvement Measure of the Retarding Effect of Protein Retarder on Phosphorus Building Gypsum

The retarding effect of protein retarder on phosphorus building gypsum(PBG)and desulfurization building gypsum(DBG)was investigated,and the results show that protein retarder for DBG can effectively prolong the setting time and displays a better retarding effect,but for PBG shows a poor retarding effect.Furthermore,the deterioration reason of the retarding effect of protein retarder on PBG was investigated by measuring the pH value and the retarder concentration of the liquid phase from vacuum filtration of PBG slurry at different hydration time,and the measure to improve the retarding effect of protein retarding on PBG was suggested.The pH value of PBG slurry(<5.0)is lower than that of DBG slurry(7.8-8.5).After hydration for 5 min,the concentration of retarder in liquid phase of DBG slurry gradually decreases,but in liquid phase of PBG slurry continually increases,which results in the worse retarding effect of protein retarder on PBG.The liquid phase pH value of PBG slurry can be adjusted higher by sodium silicate,which is beneficial to improvement in the retarding effect of the retarder.By adding 1.0%of sodium silicate,the initial setting time of PBG was efficiently prolonged from 17 to 210 min,but little effect on the absolute dry flexural strength was observed.

On Dilemma Analysis and Reasonable Measure Construction of Higher Vocational College English

English is used an important course of higher vocational colleges, which can greatly improve stuctents＂ language application ability to a great extent and it can also make students understand western culture knowledge through foreign language learning. But in current higher vocational colleges, it faces many dilemmas. Only by correctly analyzing these dilemmas will it propose corresponding reasonab!e solutions, which is good for English education development of higher vocational colleges and improving English level of higher vocational college students.

Candidate reference measurement procedure for serum 17-hydroxyprogesterone quantification via isotope dilution liquid chromatography–tandem mass spectrometry

Background:Accurate quantification of 17-hydroxyprogesterone(17-OHP)in serum is vital for clinical and research applications.However,inter-laboratory variability in test results exists owing to the lack of a standardized reference measurement procedure(RMP).Therefore,in this study,we developed a highly accurate,cost-effective,and user-friendly candidate RMP(cRMP)for analyzing 17-OHP in serum.Methods:We quantified 17-OHP in serum using a one-step liquid–liquid extraction method with the addition of 17-OHP-^(13)C_(3),followed by liquid chromatography–tandem mass spectrometry.The ability of these methods to suppress interference was evaluated by chromatographic analysis.We assessed accuracy,specificity,the lower limit of quantitation,linearity,and matrix effects by following the standards specified by the Clinical and Laboratory Standards Institute.The consistency between the developed cRMP and the chemiluminescence method was evaluated through experiments with 120 clinical samples.Results:The developed cRMP required only 8 min for accurate quantification of serum 17-OHP without bias from matrix effects or interference from 19 metabolites added as potential interferents.The method exhibited favorable measurement performance,with a quantitation limit of 0.086 ng/mL,linear range of 0.1–400 ng/mL,a total imprecision of≤2.90%,spike recovery of 100.1%–100.6%,and relative deviations from assigned target values(RfB Institution)of−2.91%to 1.10%.The cRMP demonstrated good consistency with the conventional assay(chemiluminescence method),with a correlation coefficient R of 0.96977.Conclusion:A cRMP with high accuracy,cost-effectiveness,and convenient operation was developed for quantifying 17-OHP in serum.Its simplicity and robust performance make it an invaluable addition to the arsenal of analytical tools available for laboratories.This method can enhance the accuracy and reliability of 17-OHP measurements across various laboratories.

Network Fault Analysis from Passive Measurement

A new passive method for automatic dis-covery and bcation of network failure is proposed. This method employs a passive measurement to collect infonmtion and events from network traffic, and em-ploys a rrodel-based reasoning system to detect and locate network faults. Measurement points are de-ployed in a backbone network to capture the traffic and then evaluate the Quality of Service （QoS） metrics of end-to-end IP conversations. A muting rrodel is al-so established for the observed network to simulate the attributes and activities of reuters and links. This muting model also deduces the muting path for each IP conversation, and thus the QoS metrics of IP con-versations are mapped into the metrics of paths. With the inforrmtion of shared links of overlapping paths and network torrography technique, the QoS metrics of links can also be estimated, and the poorly rated links are picked out as failure points. This method is imple-mented in a tool named FaultMan, which is deployed in a campus network. Test results have shown its availa-bility in rriddle-scale networks.

A gyroscope-based system for intraoperative measurement of tibia coronal plane alignment in total knee arthroplasty

Coronal plane alignment in total knee arthroplasty(TKA)is an important predictor of clinical outcomes including patient satisfaction and device longevity.Radiography and computer assisted navigation are the two primary technologies currently available to surgeons for intraoperative assessment of alignment;however,neither is particularly well-suited for use in this increasingly high volume procedure.Herein we propose a novel gyroscopebased instrument for intraoperative validation of tibia coronal plane alignment,and provide initial analytical and experimental performance assessments.The gyroscope-based alignment estimate is derived from simplified joint geometry and verified experimentally using a custom tibial trial insert containing a consumer-grade inertial measurement unit(IMU).Average accuracy of the gyroscope-based tibia coronal angle estimate was found to be within
1in mechanical leg jig and cadaver testing.These results indicate that the proposed gyroscope-based method shows promise for low cost,accurate intraoperative validation of limb alignment in TKA patients.Integrating IMU technology into the TKA surgical workflow via low-cost instrumentation will enable surgeons to easily validate implant alignment in real time,thereby reducing cost,operating room time,and future revision burden.

Pollutant Sources and Foaming Control Measures of Decarbonization Solution in Natural Gas Purification Plant

Yanbei project of Schlumberger Copower Oilfield Engineering Co.,Ltd.-natural gas purification plant decarbonization unit is equipped with two sets of decarbonization systems(parallel operation).The two sets of systems adopt two tower process,full lean liquid circulation regeneration process,one tower absorption(absorption pressure 5.4mpag),one tower regeneration(regeneration temperature 95℃-110℃),purified natural gas carbon dioxide content≤2.5vol%,single set The treatment capacity is 2300 KM3/d.This paper introduces the problems existing in the decarbonization solution of the decarbonization unit in the natural gas purification plant in recent three years,analyzes the causes of pollutants affecting the quality of the decarbonization solution,and probes into the control measures for the pollution of the decarbonization solution,so as to provide reference.

Research on the Reasonable Strategy of the Development of Commercial Banks under the Perspective of P2P Internet Financial Risks

In this paper, we conduct research on the reasonable strategy of the development of commercial banks under the perspective of P2P Internet financial risks. P2P financial model mainly for China＇ s small and medium enterprises and individuals to provides financing services. Generally need to use e-commerce professional network platform lending to help both sides to establish lending relationship and complete the related formalities. Traditional commercial banks need reform to keep up with the novel financial tools related to the Internet financing which will be discussed below.

Inherent Numerical Instability in Computing Invariant Measures of Markov Chains

Invariant measures of Markov chains in discrete or continuous time with a countable set of states are characterized by its steady state recurrence relations. Exemplarily, we consider transition matrices and Q-matrices with upper bandwidth n and lower bandwidth 1 where the invariant measures satisfy an (n + 1)-order linear difference equation. Markov chains of this type arise from applications to queueing problems and population dynamics. It is the purpose of this paper to point out that the forward use of this difference equation is subject to some hitherto unobserved aspects. By means of the concept of generalized continued fractions (GCFs), we prove that each invariant measure is a dominated solution of the difference equation such that forward computation becomes numerically unstable. Furthermore, the GCF-based approach provides a decoupled recursion in which the phenomenon of numerical instability does not appear. The procedure results in an iteration scheme for successively computing approximants of the desired invariant measure depending on some truncation level N. Increasing N leads to the desired solution. A comparison study of forward computation and the GCF-based approach is given for Q-matrices with upper bandwidth 1 and 2.

关于《刑事诉讼法》第四次修改的几点思考

近日,刑事诉讼法的第四次修改提上日程。学界对本次修改整体上较为积极,也有部分观点对修改存有隐忧。从整体上看,启动第四次刑事诉讼法修改有其必要性和重要的时代价值,应当抓住此次难得时机,同时,也要对实践中重打击轻保护的氛围保持高度警惕,牢牢把握人权保障和正当程序的目标和方向。刑事诉讼法第四次修改应当将刑事诉讼法典实质化作为目标,采取大修的立法模式,立足当下,着眼长远,系统规划,分步实施,迈出刑事诉讼法典实质化的关键一步。刑事诉讼法修改也要设定改革的亮点,这些亮点可以包括但不限于:重塑刑事诉讼法的篇章体例、以技术主义路径推进以审判为中心和庭审实质化、因应轻罪时代扩大附条件不起诉的适用范围、探索构建律师无效辩护制度、重塑强制措施体系、构建相对独立的涉案财物处置程序、完善证据制度等。

完善信息化追溯系统风险预警及干预对策对达芬奇手术器械处理流程的影响

目的探讨完善信息化追溯系统风险预警及干预对策对达芬奇手术器械处理流程的影响。方法选择2021年2月至2023年4月医院的162件达芬奇手术机器人的手术器械为研究对象,按照完善信息化追溯系统风险预警及干预对策实施时间分组,将2021年2月至2022年2月实施完善信息化追溯系统风险预警及干预对策前的80件达芬奇手术机器人的手术器械作为对照组,将2022年3月至2023年4月实施完善信息化追溯系统风险预警及干预对策后的82件达芬奇手术机器人的手术器械为观察组。对比两组灭菌工作质量、质量管理效果及使用满意度。结果观察组灭菌工作质量中的清洗合格率、包装正确率、监测记录合格率、存储发放正确率均高于对照组,差异有统计学意义(P<0.05);观察组器械管理质量中收发速度、供应质量、问题追溯、沟通服务方面评分均高于对照组,差异有统计学意义(P<0.05);观察组使用满意度高于对照组,差异有统计学意义(P<0.05)。结论完善信息化追溯系统风险预警及干预对策优化达芬奇手术机器人手术器械的处理流程,提高灭菌与管理质量,提升器械使用满意度。

关于建立普遍意义的附条件程序出罪制度的思考

程序出罪的规模化现象,使我国不附条件不起诉欠缺正当性或正当性不足的特征突显。这必然影响规模化程序出罪的持久性、稳定性,也会形成轻微犯罪治理质效逐渐劣化的趋势。司法规范实际确定了具有相当普遍意义的附条件程序出罪规则,及时弥补了立法的缺陷,修正了规模化程序出罪正当性不足的偏差,也为建立普遍意义的附条件程序出罪制度积累了经验。普遍意义的附条件程序出罪制度,应由附条件不启动刑事追诉程序和附条件终止刑事追诉程序构成,具体包含附条件不予立案、附条件撤销案件、附条件不起诉几种具体的程序出罪方式。以不同等级的附条件不起诉取代酌定不起诉、情节显著轻微不起诉,是建立普遍意义附条件不起诉的关键。

刑事二审发回重审制度实证研究——以河南省为例

刑事二审发回重审制度融合了保障人权和司法监督之双重功能,但在制度运行中异化为发回重审不开庭、发回标准不清晰、司法说理不明确和发回重审适用率大于改判的乱象,制度预设的保障与监督功能无法实现。在刑事诉讼法再修改的背景下,应当坚持无罪推定的精神,对刑事二审发回重审制度进行完善。首先,在发回标准上,完善实体性和程序性发回重审的规定;其次,在审判方式上,应当开庭审理;再次,在重审法院选择上,将范围扩大到原审法院之外的其他同级法院;最后,限制程序性发回的次数。

法典化视角下刑事证明标准条款的完善

偏重哲学话语的理论争议无益于解决刑事证明标准的适用难题。在法典化改革的进程中,有必要厘清刑事证明标准条款自身的逻辑性和层次性,进而对现有法律文本的表述进行适当的调整和修改,明确证据收集的程序合法标准,明确证据查证属实的法定义务,确立定罪事实排除合理怀疑的程序规则,以实现发现案件真相和保障法官自由裁量权行使之间的价值平衡,最终实现刑事证明标准在程序规范下的合理适用。

关闭前牙牙间隙的口腔门诊多科室合作临床决策

前牙牙间隙是一种常见的牙齿缺陷。临床常用关闭前牙牙间隙方案包括正畸治疗、直接修复以及间接修复等,是一项可能同时涉及正畸科、牙体牙髓科、修复科、全科以及牙周科等口腔门诊多科室合作的诊疗项目。由于当前我国口腔门诊普遍存在的分科过细、跨科室合作效率低,以及牙间隙的病因繁杂,使得临床跨科室合作关闭牙间隙时如何选择最佳治疗时机与合理方案尚缺乏清晰的诊疗思路,最终将影响关闭前牙牙间隙的疾病诊治效能和疗效。为此,本文推荐了一套基于病因诊断与牙间隙几何量实测值进行分类分级来关闭前牙牙间隙的三个序列临床决策树。该套决策树通过患者病史和临床检查结果进行病因归类,并判断牙间隙的稳定性,再进一步依据牙间隙几何量实测值、患者的求美心理评估、诊疗费用与时间成本等,合理选择相应的口腔门诊跨科室联合治疗方案,实现牙间隙的精准分类诊疗。本决策树针对前牙牙间隙跨科室合作难点,提供了客观高效的决策拐点,有助于进一步提高工作效率,提升关闭前牙牙间隙的疗效。

ELIMINATE MEASUREMENT ERROR ATTRIBUTABLE TO TEST ANXIETY

This paper illustrates students' test anxiety attributable to test itself from four aspects of testing procedure — planning, preparing, administrating, and scoring. It is the test anxiety that impedes effective and successful testing performance of students and further causes measurement error. All educators endeavor to eliminate measurement error and expect no biased results or decisions based on students' observed scores. Therefore, suggestions to solve such problems are provided here.

基于同位素稀释液相色谱串联质谱技术检测血清25(OH)D3的候选参考测量程序的建立及性能评价

目的建立基于同位素稀释液相色谱串联质谱技术(liquid phase chromatography tandem mass spectrometry,LC-MS/MS)的血清25羟维生素D3[25-hydroxy vitamin D3,25(OH)D3]的候选参考测量程序。方法采用同位素标准溶液为内标,液液萃取进行前处理,正离子电喷雾模式进行监测。参照美国临床实验室标准化协会(Clinical and Laboratory Standards Institute,CLSI)C62-A和EP15-A3等文件,对方法的正确度、精密度、线性范围、定量限、检测下限、相对基质效应等进行验证。采用候选参考测量程序和质谱常规程序检测40份临床血清样本,评价两种方法的一致性。结果候选方法的分析时间为15 min,通过色谱的等度洗脱可有效分离同分异构体3-epi-25(OH)D3,特异度好。测定参考实验室室间比对(RELA)样本,偏倚低于1.5%。批内精密度和批间精密度分别为0.75%~2.31%和1.28%~2.01%。定量限和检测下限分别为0.85 ng/ml和1.84 ng/ml。在2.5~220ng/ml浓度范围内线性良好。无相对基质效应和携带污染。质谱常规程序与候选参考程序的相关性较好(r=0.982),但低浓度样本处的偏差超出卫健委临检中心室间质评的允许总误差±25%。结论成功建立了基于LC-MS/MS技术的血清25(OH)D3的候选参考测量程序,分析性能符合要求,可用于临床常规方法的量值溯源。

关于北京大学藏秦简《算书乙种》的综合研究

新近公布的北京大学藏秦简牍中有三种前所未知的数学著作,《算书乙种》是其中之一。本文首次对它进行系统的研究,分析其体例与编纂特点、知识类型与数学方法,以及相关的社会背景,并修正了以前学术界的若干不当认识。此书为撮编之作,结构上有一定层次,体现出编排的意图但考虑不周。作为实用算法式数学文献,此书不属于从“九数”发展至《九章算术》的经典系统,但它的内容仍为刘徽关于《九章算术》源于其先秦祖本的记载提供了新的直接证据。同时,此书也为研究秦国和秦代社会经济提供了难得的原始文献。

儿科护士血压测量操作的现状调查

目的了解儿科护士血压测量操作现状,为规范儿童血压测量提供依据。方法采用便利抽样法抽取全国18个省、2个自治区、3个直辖市共230所医院的2817名儿科护士,使用自行编制的儿童血压测量操作现状问卷进行调查。结果有效调查2674名;788名(29.47%)护士选择的血压测量设备在儿童中经过验证;2037名(76.18%)护士根据儿童上臂围选择袖带型号,但1669名(62.42%)护士测量上臂围方法错误;护士血压测量次数及数值报告方法各异,甚至有17.31%的护士仅测量1次血压就取读数。结论儿童血压测量操作临床实践差异较大,需制定儿童血压测量规范化操作流程及标准,加强儿童血压测量技术的培训及推广,以提高儿科护士进行血压测量操作的规范性。

国家标准管理体制机制解析

2022年,国家市场监督管理总局对1990年《国家标准管理办法》进行了全面修订,摒弃了诸多计划经济色彩的管理措施。新修订的《国家标准管理办法》确立了多项新的制度,体现了国家治理体系和治理能力现代化的要求。本文基于我国标准化法律法规,详细阐述了国家标准的管理体制、制定原则和要求,深入解析了国家标准的制定程序及相关要点,以期帮助标准化技术组织秘书处工作人员和起草专家等标准化从业者更好地理解和掌握我国国家标准管理工作要求,不断提升国家标准质量和水平。

长江中游新九河段蔡家渡护岸损毁原因及维修对策

护岸工程在航道整治工程中被广泛用于抵御水流冲刷和维持岸线的稳定。由于护岸工程通常布置在原有岸坡易发生崩岸和垮塌的部位,易受水流冲刷而发生损毁,影响其功能的正常发挥。采用实测资料对长江中游新洲—九江河段蔡家渡护岸损毁情况进行分析。结果表明:蔡家渡护岸水下护排头部损毁严重、上游侧出现崩窝,损毁原因主要是大水作用下水流贴岸及大江侧主槽摆动等。在此基础上,分析了维修的必要性,并提出采用“补坡+镇脚”的维修方式,旨在为长江中下游类似护岸建筑物提供参考。