Filter

摘要： An experimental unit was built which was located in the vicinity of the domestic wastewater treatment plant of the Municipality of San Marcos in the Department of Carazo. Said unit consisted of two welded metal barrels with a total height of 1.8 m and a diameter of 0.90 m, likewise, this unit comprised three functional zones;the first or input area composed of a collection unit, a driving unit, a flow control unit, and two distribution units;the second or packed zone, which is the axis of the system because it is there where bacterial growth takes place and where the removal of organic matter takes place;and an outlet composed of PVC pipe [1]. The main objective of this work was to determine how efficient a rocky filter turns out to be, using stabilization pond effluent as a post-treatment unit using red concrete as a filter medium. The study consisted in carrying out laboratory tests on water samples taken from the influent and effluent of a filter made up of red rock, as a filter medium, in order to determine the percentage of organic matter removal efficiency that it has used a hydraulic retention time of 19 hours, 15 hours, and 12 hours [2]. Among the aspects to be considered in the experimental study was the characterization of the effluent from the treatment system of San Marco, Carazo, to determine the quality of water that will be of interest to the study [3]. In this stage, four composite samplings were carried out, two of 12 hours and two of 24 hours, in which physical, chemical, and microbiological parameters were analyzed. Likewise, to determine the efficiency of the filter, the same parameters considered in the characterization of the lagoon effluent were analyzed, obtaining removal efficiencies of up to 55.53% in organic matter, and 64.60% in suspended solids for a hydraulic retention time of 19 hours;In the same way, the efficiency of the filter was carried out for retention times of 15 hours and 12 hours, in which organic matter removals of 67.84% and 56.59% and 82.77% and 77.51% in total suspended solids were found, respectively.

摘要： Context: Medical imaging has a wide range of applications in today’s society. Basic projectional radiography, CT scans, mammograms and a range of other advanced technologies all use x-rays to create a large number of examinations every day across the world. The most essential component of such medical equipment is the x-ray tube, which creates and produces x-rays. Objective: We describe and investigate an abstract model-geometry of a simple x-ray tube utilizing the open-source software package of BEAMnrc of the EGSnrcmp family, which is well validated by several studies over the years, for high and low energy photons generation. Methodology: Our research focuses on two different electron beam energies: 120 keV and 30 keV. The 120 keV is the typical energy for simple projectional radiographic exams and CT examinations, whereas the 30 keV is the typical energy of mammography. Results: Two different anode materials are used for each case, Gold (Au) and Tungsten (W) for 120 keV because these are the most common in projectional radiography and CT;Molybdenum (Mo) and Rhodium (Rh) for 30 keV because with these targets most mammography exams are carried out. The aim of this work is to show how the BEAMnrc software package can simulate effectively x-ray generation of low-energy photons which are utilized in modern medical imaging procedures. We describe useful information on anode-target characteristics, such as anode angle, anode material, and metal filter materials, based on previous quality studies even by using software other than BEAMnrc. Conclusion: We demonstrate that BEAMnrc can be efficiently used for Monte Carlo modeling of low-energy photons.

摘要： “泛”滤镜047As a tool,the filter is used to realize various special effects on the images.However,“filter effect”has been created far before the birth of photography and existed to the present and has activated people’s constant consciousness and use even though it has constantly aroused disputes。

摘要： Topological photonics have led to robust optical behavior of optical devices, which has alleviated the influence of manufacturing defects and perturbations on the device performance. Meanwhile, temporal coupled-mode theory(t-CMT) has been developed and applied widely. However, the t-CMT of cascaded coupled cavities(CCC) system and its corresponding high-order filter has yet to be established. Here, the t-CMT of CCC system is established based on the existing t-CMT. By combining the CCC with topological waveguides, a versatile design scheme of high-order nonreciprocal add-drop filter(HONAF) is proposed. The relationship between the coupling effect of cavities and transmission and the filtering performance of HONAF is analyzed quantitatively. Then, a method to improve the transmission efficiency and quality factor of the filter is given. The proposed HONAF is based on the combination of gyromagnetic photonic crystals and decagonal Penrose-type photonic quasicrystals. The transmission and filtering performance of the HONAF are numerically analyzed, which verifies the consistency between theoretical prediction and numerical simulation. The established t-CMT of CCC system can be widely used in coupled resonator optical waveguides and their related systems. The proposed HONAF with excellent performance can also be applied to wavelength division multiplexing/demultiplexing systems.

摘要： This paper presents a comparison of the results obtained from the integration of the photovoltaic system to the electrical grid through the Active Power Filter.The innovative aspect of this article consists of the elaboration of 4 models in Matlab/Simulink for 4 methods of control of the Active Power Filter introduced between the photovoltaic system and the alternating current grid and the highlighting of the performances obtained regarding the quality and quantity of electricity transferred for each control method in part.Following the analysis of the results,it was found that by using the Indirect Control(CI)method of the Active Power Filter,the best results are obtained THDu=3.24%,THDi=2.46%if the photovoltaic system produces a larger amount of energy than the nonlinear load,and by using the methods of control of the Active Power Filter Synchronous Reference Frame(DQ)and Instantaneous Power(PQ)the best results are obtained:THDu=3.22%,THDi=5.26%for the method(DQ)and THDu=3.41%,THDi=5.17%for the method(PQ)if the photovoltaic system produces a smaller amount of energy than the nonlinear load.

摘要： FilterFTP软件属性:FTP工具运行环境:Win All软件大小:1.68MB软件语言:简体中文下载地址:https://www.greenxf.com/soft/405555.htmlFilter FTP是一款免费的FTP工具,能够满足用户绝大多数使用FTP服务器的功能需求.

摘要： Purpose:The purpose of this study is to report a single center experience with portable digital radiographically(DR)guided bedside IVC filters placed in intensive care unit(ICU)patients with high ICP and elevated head of bed(HOB).Materials and methods:A retrospective chart review was conducted on all bedside IVC filters placed from January 1,2010 to September 16,2020.Patients with high ICP and elevated head of bed requirements were included.Charts were reviewed for filter type,common femoral vein(CFV)access,filter location,pre procedure imaging,pre and post filter ICPs,glascow coma scale,number of radiographs taken,and filter removal.ICPs were obtained 1 h prior to procedure and 2 h post procedure and analyzed with a paired T test.Filters were placed by reviewing prior CT scan for IVC size,caval variants,renal and iliac veins and vertebral body landmarks.Then,CFV access was obtained and a Bentson wire was advanced 30-40 cm.A radiograph was used to confirm adequate position of the of the wire.The filter sheath was advanced and serial radiographs were used to position the filter sheath at the final predetermined position below the renal veins and above the iliac bifurcation.The filter was deployed,and a radiograph was obtained to confirm filter positioning.Results:A total of 9 DR guided bedside IVC filters were placed(4 Denali,3 Option Elite,2 Celect).Indications included prophylactic placement(n=8)and acute DVT(n=1).The average patient age was 35.8 years(range:18-56 years)CT abdomen and pelvis was used to assess for the level of renal veins in all patients(n=9).No caval variants were encountered on pre-procedural planning.The average pre,intraprocedural,and post procedure intracranial pressure was 16 mmHg,13 mmHg,and 16 mmHg,respectively.Confirmation of placement after final placement was available in 7 patients(4 DR,2 CT and one fluoroscopic examination).Two non-procedural related deaths occurred.Technical success,defined as successful placement of IVC filter at the predetermined level,was achieved in 100%of patients(n=9).The right CFV was used in most patients(n=7).The left CFV was used for access in two patients due to right CFV thrombus(n=1)and existing right femoral venous central line(n=1).The average number of radiographs taken was 5.8(range 4-9).In all cases,filters were placed below the level of the lowest renal vein(n=9).A comparison of pre,during and post intervention ICP pressures is shown in table,2.No differences between pre and post filter ICP was noted(p=0.77).Three filters were later removed.One minor complication was reported,which was filter tilt(23%)in an Option filter.Conclusion:Bedside IVC filters can be safely placed in patients with head trauma and high ICP who are unable to lay supine using portable DR guidance with a high rate of technical success and minimal complications.

摘要： 防火墙是整个数据包要进入主机前的第一道关卡,为了保护网络的安全,Linux系统中提供了可靠的防火墙机制Netfilter,并在此基础上提供了Iptables软件实现数据包的过滤,该文主要研究iptables内的filter和NAT功能,并实践该功能在系统中的应用,以提高网络系统的安全性.

摘要： Dear editor,As a significant topic in control and signal processing communities,the filtering problem has been attracting persistent research attention in the past few decades[1].In practical engineering,the parameter perturbations are unavoidable due mainly to exogenous disturbances,environmental changes and some other phenomena.

摘要： The problem of excessive radiated emission for a certain type of laser scanner is discussed in this paper.Firstly,the frequency characteristics of the laser scanner can be obtained by traditional test methods.According to the frequency and electronic equipment characteristics,the interference source can be estimated and established.Then based upon analysis,modified methods are proposed.By applying the above methods,the interference source can be identified and the amount of radiated emission from the scanner can be reduced effectively.Finally,the scanner can op erate in a compatible manner with other electronic systems at the same time.The above methods can provide a reference for electronic equipment design ensuring electromagnetic compatibility and passing the radiated emission test.

摘要： The design of a driving control system for high-speed telescopic boom lift truck was presented inthis paper. The PID controller was used to control the speed of the vehicle. A predictive filter was designed onthe basis of theory of the adaptive filter, which was used to predicate the system pressure difference of the vehide in the target status. The driving control system realized the combine-control of engine and variablepump, enhanced the controllability of vehicle, and optimized the working condition of engine.

摘要： 本文对大功率UPS系统的典型输入电路进行剖析，理论分析谐波电流产生的原因，提出一个新颖实用的六脉冲整流无源滤波电路，并阐述整流器无源滤波器的工作原理，设计计算出滤波器参数并进行计算机仿真，通过少量产品来验证理论设计的正确性，同时经调查目前市场的UPS运营状况，来说明对UPS谐波电流进行治理的重要性。

摘要： 本文对大功率UPS系统的典型输入电路进行剖析，理论分析谐波电流产生的原因，提出一个新颖实用的六脉冲整流无源滤波电路，并阐述整流器无源滤波器的工作原理，设计计算出滤波器参数并进行计算机仿真，通过少量产品来验证理论设计的正确性，同时经调查目前市场的UPS运营状况，来说明对UPS谐波电流进行治理的重要性。

摘要： 本文对大功率UPS系统的典型输入电路进行剖析，理论分析谐波电流产生的原因，提出一个新颖实用的六脉冲整流无源滤波电路，并阐述整流器无源滤波器的工作原理，设计计算出滤波器参数并进行计算机仿真，通过少量产品来验证理论设计的正确性，同时经调查目前市场的UPS运营状况，来说明对UPS谐波电流进行治理的重要性。

摘要： 本文对大功率UPS系统的典型输入电路进行剖析，理论分析谐波电流产生的原因，提出一个新颖实用的六脉冲整流无源滤波电路，并阐述整流器无源滤波器的工作原理，设计计算出滤波器参数并进行计算机仿真，通过少量产品来验证理论设计的正确性，同时经调查目前市场的UPS运营状况，来说明对UPS谐波电流进行治理的重要性。

摘要： 本文提出了一种新的创建虚拟三维训练环境的思路.讲述了三维场景的创建、视频的采集、三维目标的建立,并在三维场景的基础上实现了三维目标与视频的合成及融合.

摘要： 本文提出了一种新的创建虚拟三维训练环境的思路.讲述了三维场景的创建、视频的采集、三维目标的建立,并在三维场景的基础上实现了三维目标与视频的合成及融合.

摘要： 本文提出了一种新的创建虚拟三维训练环境的思路.讲述了三维场景的创建、视频的采集、三维目标的建立,并在三维场景的基础上实现了三维目标与视频的合成及融合.

摘要： 本文提出了一种新的创建虚拟三维训练环境的思路.讲述了三维场景的创建、视频的采集、三维目标的建立,并在三维场景的基础上实现了三维目标与视频的合成及融合.

摘要： 本文提出了一种新的创建虚拟三维训练环境的思路.讲述了三维场景的创建、视频的采集、三维目标的建立,并在三维场景的基础上实现了三维目标与视频的合成及融合.

摘要： 本发明公开了一种基于动态Bloom Filter的文件所有权证明方法，包括下述步骤：S1，用户计算待上传文件F的摘要hf并上传至服务器；S2，服务器检查是否存在重复，若存在重复，则对用户发起验证挑战，并转到S3挑战阶段；否则，要求用户上传文件，并转到S4上传阶段；本发明基于动态Bloom Filter提出的文件所有权证明方法，使得攻击者无法仅凭借文件摘要来获得完整的文件，同时在保证Bloom Filter验证高效性的前提下，解决了误判率增长问题，大大提高了方案的实用性；本发明采用动态Bloom Filter对Bloom Filter的大小进行动态管理，当云存储系统中文件增加时，动态Bloom Filter能够随之变大，因此可有效地控制假阳性误判率在可接受范围。

摘要： 本发明公开了一种基于Filter与知识图谱的鉴权认证方法。本发明主要应用于服务端与知识图谱用户之间；客户端对知识图谱用户的信息和时间进行base64编码，并签名生成令牌发放给用户，用户保存访问令牌，并使用token令牌访问接口；服务端对token令牌进行解析验证，并且进行混合参数验证，然后根据token中解析出来的用户ID对用户的权限进行划分；服务端保存用户ID以及该ID在单位时间内的访问次数。本发明对知识图谱接口进行了保护，有效的隔离了无权限账户的使用，同时大大加速复合型参数的检测。

摘要： 本发明提出一种基于Filter的知识图谱问答联合训练方法，该方法通过利用问句作为输入将主实体识别和关系预测两个子任务使用预训练语言模型BERT进行联合学习；将模型进行联合学习后的结果输入到过滤器中，得到适用于不同子任务的词向量表示；利用主实体识别、实体链接和关系预测的词向量表示从问句中识别出主实体，并在知识图谱中找到主实体的三元组，预测关系谓词；通过主实体词和关系谓词从知识图谱中找到答案步骤实现。本发明能够解决知识图谱问答进行联合训练时各个任务会因为彼此的特征冲突导致的学习到的模型会忽略部分任务相关的特征的问题，并通过两类过滤器来确保学习到的模型既能利用任务的关联性，又能注意到任务的差异性。

摘要： 本实用新型提供一种FILTER网条生产用冲压模具，属于汽车配件生产设备技术领域，该FILTER网条生产用冲压模具包括壳体；两个板材，两个板材均位于壳体内；间歇传送机构，间歇传送机构包括间歇传动部件、两个传送辊和两个传送带，两个传送辊的两端分别转动连接于壳体的两侧内壁；本装置可以通过间歇传送机构以固定频率间歇传送多个板材，以及冲压机构带动上模作往复升降运动向下模反复撞击的配合，以流水线的形式对大量的板材进行批量冲压作业，通过全机械操作不仅实现了智能化生产无需人工操作，从而提高了生产效率，避免了人工操作的失误降低了网条产品的次品率，而且也减小了操作人员的安全风险。

摘要： 本发明提出了一种用于SAW filter CSP形式的封装结构，所述封装结构包括芯片组；所述芯片组内的多个芯片中的部分芯片嵌入设置于所述封装结构的基板内，所述芯片组内的多个芯片中的另一部分芯片嵌入设置于所述封装结构的盖板内；所述基板内设置有多个金属铜层；所述金属铜层用于对嵌入设置于所述封装结构的基板内的芯片和嵌入设置于所述封装结构的盖板内的芯片进行信号连接及电磁屏蔽。

摘要： 本发明公开了一种基于filter–wrapper框架的电子鼻数据特征选择方法。1、使用电子鼻采集待测样品气味数据，建立样本训练集和样本测试集；2、提取原始样本数据集的时域特征和频域特征，并将提取的特征按序号进行标记，并将特征集进行归一化处理；3、采用一种混合互信息评价方法对特征集进行初次筛选，提出大部分不相关特征及少量冗余特征，使用序列后向选择算法生成特征子集并支持向量机算法评估特征子集，最终得到最优特征子集；4、借助支持向量机分类器，构建基于选择后的最优特征子集分类模型，完成对待测样品的分类。本发明结合了filter选择算法和wrapper选择算法的优点，利用其互补特性剔除电子鼻数据中的不相关特征和冗余特征，提高了电子鼻的检测性能。

摘要： 本发明公开了基于正则匹配和Bloom filter的增量新闻URL提取方法，包括以下步骤：步骤一，搭建IP代理服务；步骤二，录入网站特征数据；步骤三，生成request并发送；步骤四，response预处理；步骤五，提取URL；步骤六，URL拼接域名；步骤七，URL过滤及过滤器更新；步骤八，步骤重复；步骤九，url标准化处理；步骤十，得到增量原始新闻URL；步骤十一，得到增量标准URL；步骤十二，储存；该发明，根据新闻网站首页或子板块首页新增URL较大概率是新闻URL的特点，发明设计了通过正则提取所有URL，进行处理后，用Bloom filter快速过滤，筛选出新增的URL作为新闻URL的方法，从而能够有效的解决目前web新闻采集方法中存在的因为不能兼顾准确性和开发维护成本而带来的信息处理效率低、成本高的缺陷。

摘要： 本发明提出了一种用于SAW filter CSP形式的封装结构，所述封装结构包括芯片组；所述芯片组内的多个芯片中的部分芯片嵌入设置于所述封装结构的基板内，所述芯片组内的多个芯片中的另一部分芯片嵌入设置于所述封装结构的盖板内；所述基板内设置有多个金属铜层；所述金属铜层用于对嵌入设置于所述封装结构的基板内的芯片和嵌入设置于所述封装结构的盖板内的芯片进行信号连接及电磁屏蔽。

摘要： 本发明提供了一种基于maven的filter实现的打包方法，包括以下步骤：S1、在java项目的根目录下增加filters目录；S2、在filters目录下按打包需求增加目录，在目录下按打包需求增加配置文件；S3、对配置文件采用key＝value的格式增加配置项,key为配置项，value为配置项的值；S4、在maven项目对应的pom文件中增加配置；S5、配置打包命令，部署平台maven命令传入目录的具体值，具体值为配置文件中按打包需求指定的文件的文件名；S6、触发打包操作，完成打包。实现了根据打包需要灵活配置不同的项目的maven打包命令，实现自动化打包，适合多种项目结构。

摘要： 本发明提供的基于bloom filter的基线数据迁移的方法及装置，通过获取源端数据库的基线数据，并进行数据转换得到第一主键，根据所述第一主键通过bloom filter进行运算得到第一数据；获取目标端数据库的第二主键，并根据所述第二主键通过bloom filter进行运算得到第二数据；判断所述第一数据和第二数据是否相同，若相同，则采用单笔插入的方式进行数据迁移，在基线数据迁移之前先利用bloom filter进行过滤，从而在目标端数据库已有较为庞大数据量且内存空间有限的情形下，实现了基线数据的高效迁移，并大大的降低了内存的使用，从而提高CPU的利用率，并提高基线数据迁移的效率。