At ages 11 through 12 years, the Advisory Committee on Immunization Practices (ACIP) recommends that preteens receive 1 dose of tetanus, diphtheria, and acellular pertussis (Tdap) vaccine, 1 dose of meningococcal conjugate (MenACWY) vaccine,* and 3 doses

关键词：青少年;疫苗；年龄；疾病预防；医疗保健；免疫接种

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With the growth of the digital economy, more economic activities are taking place on the Internet, potentially reducing geographic constraints, increasing efficiency, and improving growth prospects for rural communities. Rural America, however, may be at a disadvantage in reaping the benefits of this growth because rural households are still less likely to subscribe to the Internet than are urban households. By 2010, only 62 percent of U.S. rural households and farms had home subscriptions to the Internet, compared with 73 percent of urban households. Broadband technology has become the technology of choice for Internet users (wherever it is available)-96 percent of urban and 92 percent of rural household Internet subscribers use broadband. Nevertheless, broadband Internet connections (which offer higher speed Internet access than dial-up connections) are not available as often, nor used as readily by rural households as by urban households.

关键词：农村地区；宽带；电信；通讯网络

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The use of public diplomacy is an essential component of counterterrorism efforts, but, to date, the United States has not been as effective in its attempts to utilize strategic communication against the threat of violent Islamic extremism as it has been in its utilization of military, intelligence, and law enforcement resources. Based upon the idea that a retrospective analysis of previous presidential speeches could provide guidance for future strategic communications of U.S. government officials, this thesis identifies the nature of the messages delivered by U.S. Presidents to foreign audiences since the 9/11 attacks through a qualitative analysis of a purposeful sampling of 50 speeches and statements. The analysis examines the position of the United States government in the ideological debate with violent Islamic extremists to determine whether the United States has taken a largely defensive stance, in which the United States constantly strives to counter the narrative of violent extremist adversaries, or a more forward-leaning posture, in which the United States remains primarily concerned with presenting its own narrative based on its values and ideals. The results of this analysis are then utilized to offer recommendations on modifying the message to better support U.S. efforts to combat violent Islamic extremism.

关键词：战略沟通;意识形态;知觉（心理学）;通信

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The U.S. Department of Transportation is conducting research to accelerate the widespread adoption of vehicle-to-vehicle (V2V) technology in commercial vehicles such as heavy trucks and buses. The widespread deployment of V2V safety is dependent on understanding the effectiveness of safety applications. The objective of this study was to determine the high-level performance requirements for potential V2V safety applications that are appropriate for commercial vehicles. This objective was accomplished via a 9-month project that involved reviewing literature covering collision avoidance systems currently available on heavy commercial vehicles, interviewing commercial vehicle industry representatives (manufacturers, suppliers, and fleet operators) to determine suitable crash avoidance technologies for the V2V communication, and identifying and developing high-level performance requirements for the selected commercial vehicle safety applications.

关键词：通信；商业车辆安全；碰撞避免技术性能要求；防撞系统

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The Global System for Mobile Communications (GSM) Association predicts that there will be nearly 50 billion connected devices by 2025, nearly ten times the worlds predicted human population. ABI estimates that through 2012, Machine-to-Machine connected devices will grow by 100m units per year by 2012.1 An M2M module uses a device to capture an event (temperature, activation of airbags, etc.), which is relayed through a network, either wireless or wired, to an application, such as a software program, that translates the captured event into meaningful information (e.g., ice warning, crash notification). An M2M device typically converts analog sensor data into internet protocol (IP) packets for transmission over a communications medium. M2M applications are often characterized by the absence of a human decision maker directly controlling communications intensity, frequency and costs, though there are M2M applications in the transportation sector that also require interaction with drivers. M2M devices can be transmitted over a variety of communications mediums including mobile satellite services, cellular networks, and even combinations of carriers and carrier coverage areas across several networks. Hybrid wireless solutions include intermediary devices such as cellular modems connected to an M2M endpoint via wireless local, personal area or near field communications networks such as Wi-Fi, ZigBee, Bluetooth or Radio Frequency Identification (RFID). The most common communications system for M2M in use today in North America is second generation (2G) wireless, using either General Packet Radio Service (GPRS) or Short Message Service (SMS), which uses signaling protocols that set up and tear down voice calls to transmit small amounts of data.

关键词：汽车；通讯；无线通讯；软件程序；移动卫星服务

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4Cr5MoSiV1 steel,a widely used for hot work mould,contains Cr,Mo,V alloying elements that easily form carbides.The Micro-area chemical composition,microstructure,impact toughness and thermal fatigue behavior of 4Cr5MoSiV1 and 4Cr5MoSiV1H steels were investigated,the latter was carried on high temperature homogenizing and solution based on the former.The results showed that bulk eutectic carbides and elements segregation contained in the 4Cr5MoSiV1 steel reduced the impact toughness.But the impact toughness of the core of the mould steel block and thermal fatigue property of 4Cr5MoSiV1H steel were improved because the elements segregation and eutectic carbides was eliminated through the high temperature homogenizing and solution.

关键词：钢；高温均匀化；元素偏析；力学性能

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The six important technical areas were selected by the workshop organizing committee, a group of experts from the auto and steel industries, and scientists from several National Laboratories. These selections were based on areas where there were known technical gaps, which if closed would have high impact on accelerating vehicle lightweighting with AHSS. The selected areas were: Steel Development, Fracture, Plasticity, Delayed Fracture/Hydrogen Embrittlement, Modulus Characterization and Joining. The main output of the workshop is contained within the breakout session reports, which summarize the technical requirements, engineering gaps and research needs. The breakout session reports are included below in the main workshop report.

关键词：钢铁；汽车；材料加工；车间；汽车燃料

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The Savannah River Site (SRS) is storing plutonium (Pu) materials in the K-Area Materials Storage (KAMS) facility. The Pu materials were packaged according to the DOE-STD-3013 standard and shipped to the SRS in Type B 9975 packages. The robust 9975 shipping package was not designed for long-term product storage, but it is a specified part of the storage configuration and the KAMS facility safety basis credits the 9975 design with containment. Within the 9975 package, nested stainless steel containment vessels are closed with dual O-ring seals based on Viton GLT or GLT-S fluoroelastomer. The aging behavior of the O-ring compounds is being studied to provide the facility with advanced notice of nonconformance and to develop life prediction models. A combination of field surveillance, leak testing of surrogate fixtures aged at bounding service temperatures, and accelerated-aging methodologies based on compression stress-relaxation and oxygen consumption analysis is being used to evaluate seal performance. A summary of the surveillance program relative to seal aging behavior is presented.

关键词：氟橡胶；O型圈；密封件（塞子）；放射性物质

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In 1997, the first two United States Department of Energy (US DOE) high level waste tanks (Tanks 17-F and 20-F: Type IV, single shell tanks) were taken out of service (permanently closed) at the Savannah River Site (SRS). In 2012, the DOE plans to remove from service two additional Savannah River Site (SRS) Type IV high-level waste tanks, Tanks 18-F and 19-F. These tanks were constructed in the late 1950s and received low-heat waste and do not contain cooling coils. Operational closure of Tanks 18-F and 19-F is intended to be consistent with the applicable requirements of the Resource Conservation and Recovery Act (RCRA) and the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) and will be performed in accordance with South Carolina Department of Health and Environmental Control (SCDHEC). The closure will physically stabilize two 4.92E+04 cubic meter (1.3 E+06 gallon) carbon steel tanks and isolate and stabilize any residual contaminants left in the tanks. The closure will also fill, physically stabilize and isolate ancillary equipment abandoned in the tanks. A Performance Assessment (PA) has been developed to assess the long-term fate and transport of residual contamination in the environment resulting from the operational closure of the F-Area Tank Farm (FTF) waste tanks.

关键词：钢铁；放射性废物贮存罐；水泥；灌浆

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Aqueous radioactive wastes from Savannah River Site (SRS) separations and vitrification processes are contained in large underground carbon steel tanks. Inspections made during 2011 to evaluate these vessels and other waste handling facilities along with evaluations based on data from previous inspections are the subject of this report. The 2011 inspection program revealed that the structural integrity and waste confinement capability of the Savannah River Site waste tanks were maintained. All inspections scheduled per SRR-LWE-2011-00026, HLW Tank Farm Inspection Plan for 2011, were completed. Ultrasonic measurements (UT) performed in 2011 met the requirements of C-ESR-G-00006, In-Service Inspection Program for High Level Waste Tanks, Rev. 3, and WSRC-TR-2002-00061, Rev.6. UT inspections were performed on Tanks 25, 26 and 34 and the findings are documented in SRNL-STI-2011-00495, Tank Inspection NDE Results for Fiscal Year 2011, Waste Tanks 25, 26, 34 and 41. A total of 5813 photographs were made and 835 visual and video inspections were performed during 2011. A potential leaksite was discovered at Tank 4 during routine annual inspections performed in 2011. The new crack, which is above the allowable fill level, resulted in no release to the environment or tank annulus. The location of the crack is documented in C-ESR-G-00003, SRS High Level Waste Tank Leaksite Information, Rev.6.

关键词：钢铁；放射性废物；坦克；碳素钢

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