WorldWideScience

Sample records for repair including dredging

  1. Informational Webinar on Dredging and Dredged Material Management in Long Island Sound

    Science.gov (United States)

    EPA Region 1 and Region 2 informational webinar on dredging and dredged material management in Long Island Sound. Topics include: dredging permit process, dredged material testing, and dredged material disposal.

  2. Dredged Material Management in Long Island Sound

    Science.gov (United States)

    Information on Western and Central Long Island Sound Dredged Material Disposal Sites including the Dredged Material Management Plan and Regional Dredging Team. Information regarding the Eastern Long Island Sound Selected Site including public meetings.

  3. Long-term morphological response to dredging including cut-across-shoal in a tidal channel-shoal system

    Science.gov (United States)

    Wang, Yu-Hai; Wang, Chong-Hao; Tang, Li-Qun; Liu, Da-Bin; Guo, Chuan-Sheng; Liu, Chun-Jing; Zhao, Hui-Ming

    2014-12-01

    This study examines long-term channel-shoal stability in the Tieshan Bay, which is located on the southwest coast of China. A large-scale channel-shoal system has historically existed in the outer Tieshan Bay. A navigation waterway is initiated by cutting and dredging a mid-channel shoal to supply coal to a power plant on the middle coast of the Tieshan Bay. Dredging of the access channel to the Tieshan Port was conducted in two stages followed by land reclamation. It is thus of practical meaning to explore how the channel-shoal system will evolve in long term afterwards. This study uses the process-based finite-volume coastal ocean model (FVCOM) to investigate long-term (centennial) morphological evolution of the channel-shoal system. After well calibration of hydrodynamics and sediment transport, the model forecasts morphodynamic evolution in hundred years. The simulations show that continuous erosion in tidal channels and accretion over shoals and intertidal flats occur. However, the cutting and access channels will be subjected to long-term siltation. A secondary channel indicating the reorientation of the access channel will emerge, and a localized channel-ridge system at the junction of the major channels will be formed. The overall erosion/accretion pattern demonstrates the combined effect of bottom friction and advective sediment transport processes to be responsible for the channel-shoal formation. Dredging of the tidal channels will stimulate the stability of the channel-shoal pattern. It suggests that the navigation waterway should be set up following the long-term morphological evolution of the channel-shoal system at a design stage and maintenance dredging volume might thus be minimized.

  4. DECONTAMINATION AND BENEFICIAL USE OF DREDGED MATERIALS.

    Energy Technology Data Exchange (ETDEWEB)

    STERN, E.A.; LODGE, J.; JONES, K.W.; CLESCERI, N.L.; FENG, H.; DOUGLAS, W.S.

    2000-12-03

    Our group is leading a large-sale demonstration of dredged material decontamination technologies for the New York/New Jersey Harbor. The goal of the project is to assemble a complete system for economic transformation of contaminated dredged material into an environmentally-benign material used in the manufacture of a variety of beneficial use products. This requires the integration of scientific, engineering, business, and policy issues on matters that include basic knowledge of sediment properties, contaminant distribution visualization, sediment toxicity, dredging and dewatering techniques, decontamination technologies, and product manufacturing technologies and marketing. A summary of the present status of the system demonstrations including the use of both existing and new manufacturing facilities is given here. These decontamination systems should serve as a model for use in dredged material management plans of regions other than NY/NJ Harbor, such as Long Island Sound, where new approaches to the handling of contaminated sediments are desirable.

  5. Beneficial Use of Dredged Material

    Science.gov (United States)

    An important goal of managing dredged material is to ensure that the material is used or disposed of in an environmentally sound manner.Most of this dredged material could be used in a beneficial manner instead.

  6. Ocean Disposal of Dredged Material

    Science.gov (United States)

    Permits and authorizations for the ocean dumping of dredged material is issued by U.S. Army Corps of Engineers. Information is provided about where to dispose dredged material and the process for obtaining an ocean dumping permit for dredged material.

  7. Water injection dredging

    NARCIS (Netherlands)

    Verhagen, H.J.

    2000-01-01

    Some twenty years ago WIS-dredging has been developed in the Netherlands. By injecting water into the mud layer, the water content of the mud becomes higher, it becomes fluid mud and will start to flow. The advantages of this system are that there is no need of transporting the mud in a hopper, and

  8. Seagrasses, Dredging and Light in Laguna Madre, Texas, U.S.A.

    Science.gov (United States)

    Onuf, Christopher P.

    1994-07-01

    Light reduction resulting from maintenance dredging was the suspected cause of large-scale loss of seagrass cover in deep parts of Laguna Madre between surveys conducted in 1965 and 1974. Additional changes to 1988, together with an analysis of dredging frequency and intensity for different parts of the laguna, were consistent with this interpretation. Intensive monitoring of the underwater light regime and compilation of detailed environmental data for 3 months before and 15 months after a dredging project in 1988 revealed reduced light attributable to dredging in four of eight subdivisions of the study area, including the most extensive seagrass meadow in the study area. Dredging effects were strongest close to disposal areas used during this project but still were detectable on transects >1·2 km from the nearest dredge disposal area. In the subdivision of the study area where most of the dredge disposal occurred, light attenuation was increased throughout the 15 months of observation after dredging. In the seagrass meadow and the transition zone at the outer edge of the meadow, effects were evident up to 10 months after dredging. Resuspension and dispersion events caused by wind-generated waves are responsible for the propagation of dredge-related turbidity over space and time in this system.

  9. Delayed peripheral nerve repair: methods, including surgical ′cross-bridging′ to promote nerve regeneration

    Directory of Open Access Journals (Sweden)

    Tessa Gordon

    2015-01-01

    Full Text Available Despite the capacity of Schwann cells to support peripheral nerve regeneration, functional recovery after nerve injuries is frequently poor, especially for proximal injuries that require regenerating axons to grow over long distances to reinnervate distal targets. Nerve transfers, where small fascicles from an adjacent intact nerve are coapted to the nerve stump of a nearby denervated muscle, allow for functional return but at the expense of reduced numbers of innervating nerves. A 1-hour period of 20 Hz electrical nerve stimulation via electrodes proximal to an injury site accelerates axon outgrowth to hasten target reinnervation in rats and humans, even after delayed surgery. A novel strategy of enticing donor axons from an otherwise intact nerve to grow through small nerve grafts (cross-bridges into a denervated nerve stump, promotes improved axon regeneration after delayed nerve repair. The efficacy of this technique has been demonstrated in a rat model and is now in clinical use in patients undergoing cross-face nerve grafting for facial paralysis. In conclusion, brief electrical stimulation, combined with the surgical technique of promoting the regeneration of some donor axons to ′protect′ chronically denervated Schwann cells, improves nerve regeneration and, in turn, functional outcomes in the management of peripheral nerve injuries.

  10. Selected Problems Of Noninvasive Ooze Dredging In The Protected Areas Of Port Docks

    Directory of Open Access Journals (Sweden)

    Abramowicz-Gerigk Teresa

    2015-09-01

    Full Text Available The paper presents the analysis of the ooze dredging concepts in the protected areas of harbour docks. The proposed method and system for ooze dredging are dedicated to all types of seabed protection, but the main concern are the geotextile mattresses, not resistant to mechanical damages. Due to the large seabed areas covered with this type of protection the effective method of noninvasive ooze dredging should be based on the use of a technical vessel for underwater works. The result of the analysis is the concept of the method and system for ooze dredging including in particular the mechanism for the automatic holding of the suction-dredge head in the proper distance from the seabed protection surface - the leading wheel truck and buoyancy-ballast system.

  11. Spatial Patterns in Water Quality Changes during Dredging in Tropical Environments.

    Science.gov (United States)

    Fisher, Rebecca; Stark, Clair; Ridd, Peter; Jones, Ross

    2015-01-01

    Dredging poses a potential risk to tropical ecosystems, especially in turbidity-sensitive environments such as coral reefs, filter feeding communities and seagrasses. There is little detailed observational time-series data on the spatial effects of dredging on turbidity and light and defining likely footprints is a fundamental task for impact prediction, the EIA process, and for designing monitoring projects when dredging is underway. It is also important for public perception of risks associated with dredging. Using an extensive collection of in situ water quality data (73 sites) from three recent large scale capital dredging programs in Australia, and which included extensive pre-dredging baseline data, we describe relationships with distance from dredging for a range of water quality metrics. Using a criterion to define a zone of potential impact of where the water quality value exceeds the 80th percentile of the baseline value for turbidity-based metrics or the 20th percentile for the light based metrics, effects were observed predominantly up to three km from dredging, but in one instance up to nearly 20 km. This upper (~20 km) limit was unusual and caused by a local oceanographic feature of consistent unidirectional flow during the project. Water quality loggers were located along the principal axis of this flow (from 200 m to 30 km) and provided the opportunity to develop a matrix of exposure based on running means calculated across multiple time periods (from hours to one month) and distance from the dredging, and summarized across a broad range of percentile values. This information can be used to more formally develop water quality thresholds for benthic organisms, such as corals, filter-feeders (e.g. sponges) and seagrasses in future laboratory- and field-based studies using environmentally realistic and relevant exposure scenarios, that may be used to further refine distance based analyses of impact, potentially further reducing the size of the dredging

  12. Coastal Modeling System: Dredging Module

    Science.gov (United States)

    2016-06-01

    simulate dredging activities in the St. Marys Entrance Channel (i.e., the offshore portion of the channel). Bathymetry data were obtained from NOAA’s...National Geophysical Data Center (NGDC) web site (NGDC 2014) for St. Marys En- trance, the adjacent offshore area, and in Cumberland Sound. A...with tide constit- uent data using the tidal consistent database available via SMS. Wind data were obtained from the NOAA meteorological station at

  13. Recycled Glass and Dredged Materials

    Science.gov (United States)

    2007-03-01

    rotary kiln is part of the process that converts dredged material stored in a CDF to lightweight aggregate, and the proprietary technique has been...combustion byproducts, incinerator ash residue, waste lime products, and cement production byproducts. Two commercial recyling operations for amending...clayey silt and silty sand with Portland cement increased the compressive strength to 360 psi and 1170 psi, respectively (Silva et al. 2003). FINE

  14. Dredge spoil disposal off Kavaratti Island, Lakshadweep, India

    Digital Repository Service at National Institute of Oceanography (India)

    Chandramohan, P.; SanilKumar, V.; Jayakumar, S.

    Maintenance dredging has been carried out along the navigational channel at Kavaratii Island and dredge spoil is disposed in the open sea. This paper describes the movement of sediment plume while dredging and disposal. The study indicates...

  15. Precise and economical dredging model of sediments and its field application: case study of a river heavily polluted by organic matter, nitrogen, and phosphorus.

    Science.gov (United States)

    Zhang, Rui; Zeng, Fan-Xin; Liu, Wu-Jun; Zeng, Raymond J; Jiang, Hong

    2014-06-01

    Environmental dredging is an efficient means to counteract the eutrophication of water bodies caused by endogenous release of nitrogen and/or phosphorus from polluted sediments. The huge operational cost and subsequent disposal cost of the dredged polluted sediments, as well as the adverse effect on the benthic environment caused by excessive dredging, make the currently adopted dredging methods unfavorable. Precise dredging, i.e., determining the dredging depth based on the pollution level, not only significantly decreases the costs but also leaves a uniform favorable environment for benthos. However, there is still no feasible process to make this promising method executable. Taking a river heavily polluted by organic compounds as an example, we proposed an executable precise dredging process, including sediment survey, model establishment, data interpolation, and calculation of dredging amount. Compared with the traditional dredging method, the precise one would save 16 to 45% of cost according to different pollutant removal demands. This precise dredging method was adopted by the National Water Project of China to treat the endogenous pollution of Nanfei River in 2010. This research provides a universal scientific and engineering basis for sediment dredging projects.

  16. Evaluation of dredged material proposed for ocean disposal from Buttermilk Channel, New York

    Energy Technology Data Exchange (ETDEWEB)

    Gardiner, W.W.; Barrows, E.S.; Antrim, L.D; Gruendell, B.D.; Word, J.Q.; Tokos, J.J.S. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1996-08-01

    Buttermilk Channel was one of seven waterways that was sampled and evaluated for dredging and sediment disposal. Sediment samples were collected and analyses were conducted on sediment core samples. The evaluation of proposed dredged material from the channel included bulk sediment chemical analyses, chemical analyses of site water and elutriate, water column and benthic acute toxicity tests, and bioaccumulation studies. Individual sediment core samples were analyzed for grain size, moisture content, and total organic carbon. A composite sediment samples, representing the entire area proposed for dredging, was analyzed for bulk density, polynuclear aromatic hydrocarbons, and 1,4-dichlorobenzene. Site water and elutriate were analyzed for metals, pesticides, and PCBs.

  17. New Bedford Harbor Superfund Project Acushnet River Estuary Engineering Feasibility Study of Dredging and Dredged Material Disposal Alternatives. Report 10. Evaluation of Dredging and Dredging Control Technologies

    Science.gov (United States)

    1988-11-01

    views of Japanese Refresher system (from Kaneko, Watari , and Aritomi 1984) 26 ARABj...jiu,2 Figure 13. Horizontal cutterhead of the Mudcat dredge...Turbidity Control," Proceedings of the Specialty Conference on Dredging and Its Environmental Effects, Mobile, AL, January 26-28, 1976. Kaneko, A., Watari , Y

  18. Treatment of knee arthrofibrosis and quadriceps insufficiency after patellar tendon repair: a case report including use of the graston technique.

    Science.gov (United States)

    Black, Douglass W

    2010-06-23

    Arthrofibrosis of the knee is a surgical complication that can limit range of motion, inhibit muscle activity, and decrease patient function. Optimal conservative treatment has not been well established in the literature, leaving a clinician with limited evidence for treatment planning. Described here is part of the rehabilitative course of care for a patient with arthrofibrotic limitations after a mid-substance patellar tendon repair with augmentation. Marked limitations in knee flexion range of motion and quadriceps activity were addressed using the Graston Technique to deal with soft-tissue adhesions; traditional physical therapy care was also provided. Clear improvement in range of motion and quadriceps activity and function was noted over the course of 5 treatments during 1 month. Treatment process and clinical reasoning are offered to promote understanding and to facilitate future inquiry.

  19. Anthropogenic landforms and sediments from dredging and disposing sand along the Apalachicola River and its floodplain

    Science.gov (United States)

    Mossa, Joann; Chen, Yin-Hsuen; Walls, Scott P.; Kondolf, G. Mathias; Wu, Chia-Yu

    2017-10-01

    The Apalachicola River, which begins at the confluence of the Chattahoochee and Flint rivers near the Georgia-Florida State line, has multiple human impacts. Water inputs declined due to upstream irrigation and urbanization in Georgia. Sediment trapped by numerous small to large dams, including construction of Jim Woodruff Dam in 1954 near the Apalachicola-Chattahoochee-Flint (ACF) confluence has increased degradation. Shortly thereafter, the river was modified for a navigation project, with 29.6 × 106 m3 dredged between 1957 and 2002 from the Apalachicola alone. This study investigates how historic dredging coincides with the modern morphology of the channel and how historic dredging, disposal, and other activities have modified the floodplain landforms and sediments. This analysis of the navigation impacts in the middle Apalachicola River (River Miles 40 to 65) ties spatial and temporal variations of dredging, field-derived bathymetry, historic maps, patterns of floodplain disposal of dredge spoil from LiDAR imagery, and modern point bar channel change of the Apalachicola River. Floodplain mounds of coarse material, built from out-of-bank disposal constitute > 800,000 m3 in the study area. Approximately 7.7 × 106 m3 of sediment was dredged within the study reach, roughly 11% of the volume dredged remains on the floodplain. Sand bars were disposal sites thus their increased area of 263% is partly tied to this practice. Thus, the legacy of dredging affects the modern sedimentology and morphology of the floodplain and channel. Findings show that a failed navigation project could have been pre-empted with better geomorphic, geologic and hydrologic study and suggest that vegetative restoration of point bars would help in narrowing and stabilizing this dynamic system.

  20. Effects of riverine suspended particulate matter on the post-dredging increase in internal phosphorus loading across the sediment-water interface.

    Science.gov (United States)

    Liu, Cheng; Shao, Shiguang; Shen, Qiushi; Fan, Chengxin; Zhang, Lei; Zhou, Qilin

    2016-04-01

    Dredging is frequently used in the river mouths of eutrophic lakes to reduce internal phosphorus (P) loading from the sediment. However, the accumulation of P-adsorbed suspended particulate matter (SPM) from the inflowing rivers negatively affects the post-dredging sediment-water interface and ultimately increases internal P loading. Here, a 360-d experiment was carried out to investigate the influence of riverine SPM on the efficacy of dredging in reducing internal P loading. SPM was added to dredged and undredged sediments collected from the confluence area of Lake Chaohu. Several parameters related to internal P loading, including oxygen profile, soluble reactive P, and ferrous iron across the sediment-water interface, organic matter, alkaline phosphatase activity, and P fractions, were measured throughout the experimental period. The results showed that the P content (especially mobile P) in the sediment increased to the pre-dredging level with the accumulation of SPM in the dredged sediment. In addition, the P flux across the sediment-water interface increased with the accumulation of SPM. Several characteristics of SPM, including high organic matter content, mobile P, high activity of alkaline phosphatase, and high biological activity, were considered correlated with the post-dredging increase in internal P loading. Overall, this study showed that the heavily contaminated riverine SPM regulates the long-term efficacy of dredging as a nutrient management option in the confluence area. Management is needed to avoid or reduce this phenomenon during dredging projects of this nature.

  1. Research on Replacement Model for Queuing System with Deteriorative Repairable Service Station Including Delay Repair%带延迟修理的退化服务台排队系统更换模型研究

    Institute of Scientific and Technical Information of China (English)

    贾积身; 侯江华

    2011-01-01

    针对带有延迟修理的退化可修服务台的排队系统,提出了一种新的维修更换模型。假定服务台逐次故障后的维修时间构成随机递增的几何过程,工作时间构成随机递增的几何过程,在服务台每次故障以概率P需要延迟修理和延迟修理时间为随机变量的情况下,选取被服务的顾客数N为其更换策略,以系统长期运行单位时间内的期望效益为目标函数,通过更新过程和几何过程理论建立数学模型,导出了目标函数的解析表达式。并根据目标函数情况,通过最大化目标函数来获取系统最优的更换策略N^*,最后还对结果进行了讨论。%To study queueing system with deteriorative repairable service station including delay repair, this paper proposes a kind of new maintenance and replacement model. Supposing that the successive survival time of the system constitute a decreasing geometric process stochastically, while the consecutive repair time of the system constitute an increasing geometric process, under the conditions that the delay repair time is random variable and the failure service station needs delay repair with probability , we take the number N of the customer that have been serv- iced at the service station as its replacement policy and choose the long - run expected profit per unit time as objec- tive function. By using renewal process and geometric process theory, mathematic model is established and the ex- plicit expressions of the objective function is derived. According objective function, the optimal replacement policy is obtained by maximizing the objective function. Finally, we discuss the result also.

  2. Environmental assessment of proposed dredging and disposal activities at the St. George small boat harbor, reconnaissance stage: Planning aid report

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Types of environmental impacts possibly resulting from dredging and disposal activities at the St. George Island small boat harbor include: 1) bottom topographic and...

  3. determination of area and volume from dredged geodata set

    African Journals Online (AJOL)

    user

    reduce risks to human health and the environment [1]. ... contaminated with a variety of pollutants. The ... affect the environment, harm aquatic organisms or ... Ocean. 3. DREDGING PROCESS. The three types of dredging are the navigational,.

  4. Merits of a Scenario Approach in Dredge Plume Modelling

    DEFF Research Database (Denmark)

    Pedersen, Claus; Chu, Amy Ling Chu; Hjelmager Jensen, Jacob

    2011-01-01

    Dredge plume modelling is a key tool for quantification of potential impacts to inform the EIA process. There are, however, significant uncertainties associated with the modelling at the EIA stage when both dredging methodology and schedule are likely to be a guess at best as the dredging contrac...

  5. Numerical simulation methods for sense-phase dredging flows

    NARCIS (Netherlands)

    Konijn, Bartholomeus Johannes

    2016-01-01

    Dredging is the process of excavation of sediment, usually carried out underwater, with the purpose of the collection of the excavated sediment, such as sand, and subsequently its disposition at another location. In order to be able to predict the performance of dredging equipment, such as dredging

  6. San Francisco Bay Long Term Management Strategy for Dredging

    Science.gov (United States)

    The San Francisco Bay Long Term Management Strategy (LTMS) is a cooperative effort to develop a new approach to dredging and dredged material disposal in the San Francisco Bay area. The LTMS serves as the Regional Dredging Team for the San Francisco area.

  7. Repair and Dredging of Bear Creek Marina Final Environmental Assessment

    Science.gov (United States)

    2007-06-01

    Requisite to protect the public health and welfare with an adequate margin of safety” (USEPA, 1974). Noise may be heard, but there is no...risk to public health or welfare . • A day-night average noise level of 75 dBA is a threshold above which effects other than annoyance may occur. It...Atlantic Bottlenose Dolphin (Tursiops truncatus) Like all cetaceans (dolphins and whales), the Atlantic bottlenose dolphin may be affected by loud

  8. Turbine repair process, repaired coating, and repaired turbine component

    Energy Technology Data Exchange (ETDEWEB)

    Das, Rupak; Delvaux, John McConnell; Garcia-Crespo, Andres Jose

    2015-11-03

    A turbine repair process, a repaired coating, and a repaired turbine component are disclosed. The turbine repair process includes providing a turbine component having a higher-pressure region and a lower-pressure region, introducing particles into the higher-pressure region, and at least partially repairing an opening between the higher-pressure region and the lower-pressure region with at least one of the particles to form a repaired turbine component. The repaired coating includes a silicon material, a ceramic matrix composite material, and a repaired region having the silicon material deposited on and surrounded by the ceramic matrix composite material. The repaired turbine component a ceramic matrix composite layer and a repaired region having silicon material deposited on and surrounded by the ceramic matrix composite material.

  9. Evaluation of dredged material proposed for ocean disposal from MOTBY

    Energy Technology Data Exchange (ETDEWEB)

    Barrows, E.S.; Mayhew, H.L.; Word, J.Q. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1996-09-01

    The National Park Service, US Department of the Interior requested U.S. Army Corps of Engineers/New York District (USACE-NYD) to evaluate sediments around the Military Ocean Terminal (MOTBY) in Bayonne, New Jersey for unconfined ocean disposal at the Mud Dump Site. Sediment samples were collected from MOTBY. Tests and analyses were conducted on MOTBY sediment core samples. The evaluation of proposed dredged material from MOTBY included grain size and total organic carbon (TOC) analyses and one acute toxicity test with the amphipod Ampelisca abdita. In addition to this benthic toxicity test, a bioaccumulation test (28-day exposure) was conducted.

  10. Stakeholder engagement in dredged material management decisions.

    Science.gov (United States)

    Collier, Zachary A; Bates, Matthew E; Wood, Matthew D; Linkov, Igor

    2014-10-15

    Dredging and disposal issues often become controversial with local stakeholders because of their competing interests. These interests tend to manifest themselves in stakeholders holding onto entrenched positions, and deadlock can result without a methodology to move the stakeholder group past the status quo. However, these situations can be represented as multi-stakeholder, multi-criteria decision problems. In this paper, we describe a case study in which multi-criteria decision analysis was implemented in a multi-stakeholder setting in order to generate recommendations on dredged material placement for Long Island Sound's Dredged Material Management Plan. A working-group of representatives from various stakeholder organizations was formed and consulted to help prioritize sediment placement sites for each dredging center in the region by collaboratively building a multi-criteria decision model. The resulting model framed the problem as several alternatives, criteria, sub-criteria, and metrics relevant to stakeholder interests in the Long Island Sound region. An elicitation of values, represented as criteria weights, was then conducted. Results show that in general, stakeholders tended to agree that all criteria were at least somewhat important, and on average there was strong agreement on the order of preferences among the diverse groups of stakeholders. By developing the decision model iteratively with stakeholders as a group and soliciting their preferences, the process sought to increase stakeholder involvement at the front-end of the prioritization process and lead to increased knowledge and consensus regarding the importance of site-specific criteria.

  11. Outcomes of arthroscopic Hill-Sachs remplissage and anterior Bankart repair: a retrospective controlled study including ultrasound evaluation of posterior capsulotenodesis and infraspinatus strength assessment.

    Science.gov (United States)

    Merolla, Giovanni; Paladini, Paolo; Di Napoli, Giuseppe; Campi, Fabrizio; Porcellini, Giuseppe

    2015-02-01

    Hill-Sachs lesions are compression fractures that result from shoulder dislocation. They involve "engaging" the humeral head on the anterior glenoid rim when the arm is abducted and externally rotated. The defect grows as the number of dislocations increases. Arthroscopic remplissage and anterior Bankart repair do not significantly affect infraspinatus strength while ensuring healing of the capsulotenodesis. Cohort study; Level of evidence, 3. Sixty-one patients with traumatic anterior shoulder instability treated by arthroscopic Bankart repair and Hill-Sachs remplissage at least 24 months previously were compared with a control group of 40 healthy participants. Preoperative imaging included magnetic resonance imaging for Bankart lesion identification and computed tomography to quantify the humeral head defect. Active range of motion and clinical scores (Walch-Duplay, Constant-Murley, and Rowe) were assessed. External rotation (ER) and internal rotation (IR) were measured with arm at the side (ER1 and IR1) and abducted at 90° (ER2 and IR2). Infraspinatus strength was assessed with the scapula free (infraspinatus strength test [IST]) and retracted (infraspinatus scapula retraction test [ISRT]). Infraspinatus tenodesis and posterior capsulodesis healing were evaluated by ultrasound (US). The follow-up median was 39.5 months (range, 24-56 months). One patient experienced a recurrence of instability at 34 months. In the remplissage patients, ER1 was significantly lower in the affected compared with the unaffected shoulder (P lesions. The ER and IR restriction does not significantly affect quality of life. Infraspinatus strength recovery is satisfactory even compared with healthy subjects. Ultrasound examination allows accurate evaluation of capsulotenodesis healing. © 2014 The Author(s).

  12. Perawatan Ameloblastoma Rekuren dengan Metode Dredging

    Directory of Open Access Journals (Sweden)

    R. Rahardjo

    2016-10-01

    Full Text Available Latar belakang. Ameloblastoma dapat menyebabkan kerusakan pada tulang wajah baik pada maksila maupun mandibula. Tumor ini dapat mengalami rekurensi apabila perawatan tidak sempurna. Reseksi pada tulang yang terkena adalah tindakan yang biasa dilakukan untuk perawatan tumor ini. Tindakan ini dapat menyebabkan gangguan maloklusi, gangguan pertumbuhan dan perkembangan gigi dan tulang rahang bila dilakukan pada anak-anak dan remaja, gangguan estetika, dan berdampak psikologis. Oleh karena itu tindakan alternatif dalam perawatan ameloblastoma adalah dengan metode dredging. Tujuan laporan kasus ini menjelaskan perawatan metode dredging pada rekuren ameloblastoma pada penderita laki-laki usia dua puluh tujuh tahun sehingga dapat menghilangkan dampak psikologis dari penderita. Kasus. Penderita laki-laki usia dua puluh tujuah tahun dengan keluhan benjolan dalam mulut, tidak terasa sakit, dan merasa bertambah besar. Terdapat asimetri wajah di sebelah kanan, tidak ada perubahan warna kulit. Penderita mengaku pernah dioperasi tujuh tahun yang lalu. Pada pemeriksaan intra oral didapatkan benjolan pada mandibula di daerah bukal dari daerah gigi 42 sampai 46. Pada palpasi terasa ada fluktuasi, rasa sakit ringan dan warna mukosa normal. Pada gambaran foto panoramic terlihat area radiolusen dengan batas jelas dari daerah 42 sampai 46 dengan melibatkan aspek dari gigi 42 dan 43. Dari hasil biopsi dan pemeriksaan patologi anatomi dinyatakan sebagai ameloblastoma unikistik tipe folikuler. Penatalaksanaan. Dredging dikerjakan dengan melakukan defleksi pada lesi enukleasi dan kuretase. Pada bulan kedua perawatan tindakan tersebut diulangi dan dilakukan pemeriksaan histopatologis. Tindakan tersebut diulang pada bulan kelima dan diulang kembali setiap tiga bulan sampai dinyatakan terbebas dari sel tumor. Kesimpulan. Telah dilakukan dredging pada penderita rekuren ameloblastoma dengan hasil cukup memuaskan dan dilakukan pengamatan yang berlanjut.   Background

  13. Profile constructing and elevation design of soil reclaimed by hydraulic dredge pump in mining areas

    Energy Technology Data Exchange (ETDEWEB)

    Longqian, C.; Aiqin, S.; Tianjian, Z. [China Univ. of Mining and Technology, Xuzhou, Jiangsu (China). School of Environmental Science and Spatial Informatics; Mei, L. [China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)

    2007-07-01

    Underground coal mining is the main method of coal mining in China. The hydraulic dredge pump reclamation method is the basic method used for repairing hydraulic erosion. This paper reviewed land reclamation by hydraulic dredge pump in the Yi'an coal mine of Xuzhou mining area in the east of China, and analyzed the constructing theory of soil profiling. It examined factors such as the height of the ground-water table; the thickness of plough horizon; the length of crops root and the state of soil erosion; and the methods of profile construction and elevation design of soil reclaimed by hydraulic dredge pump. A relevant mathematical model was also developed. The paper discussed the general situation of the study site as well as the basic theory of profile constructing and the profile constructing method. The paper also discussed the elevation design of the reclaimed land. It was concluded that the practice has proved that the methods can make the reclaimed soil keep a similar characteristics to that of original cropped soil, and meet the requirements for elevation of reclaimed land. 8 refs., 1 tab., 2 figs.

  14. Modeling of Nearshore-Placed Dredged Material

    Science.gov (United States)

    2015-07-01

    and nourishes the beach. The focus of the present study is to examine the design for nearshore placement of dredged material through laboratory...Army Engineer Research and Development Center,, Coastal and Hydraulics Laboratory,3909 Halls Ferry Road,,Vicksburg,,MS, 39180 8. PERFORMING...Material Ernest R. Smith and Rusty L. Permenter Coastal and Hydraulics Laboratory U.S. Army Engineer Research and Development Center 3909 Halls

  15. 3000m3/h cutter-suction dredge

    Institute of Scientific and Technical Information of China (English)

    2004-01-01

    @@ In October 2004, the Fumin 9 3000 m3/h cutter-suction dredge co-designed by the Dutch IHC and Guangzhou Wenchong Shipyard went through a dock usability test and a 25 meter clean water test. The dredge is the largest of its kind in China, and the most advanced and most efficient cutter-suction dredge in the world. The IHC was responsible for the design of the ship till its working design was taken over by Guangzhou Wenchong Shipyard, the builder of the dredge, who had started its construction on October 23, 2003.

  16. Characterization of Underwater Sounds Produced by a Hydraulic Cutterhead Dredge during Maintenance Dredging in the Stockton Deepwater Shipping Channel, California

    Science.gov (United States)

    2014-03-01

    NASA, and BOEM conducted a joint study to monitor underwater sounds produced by three trailing suction hopper dredges (TSHDs) working concurrently...2) sounds generated by pumps and impellers driving the suction of material through the pipes, 3) transport sounds involving the movement of...dredging operations (e.g. bucket dredging). Thus, characterizing the cutterhead sounds collected in this study was constrained to analyses of

  17. Impact of roadside ditch dredging on bacterial communities and biological contamination of a tidal creek

    Science.gov (United States)

    Jones, Chance E.; Barkovskii, Andrei L.

    2017-03-01

    Tidal creek networks form the primary hydrologic link between estuaries and land-based activities on barrier islands. A possible impact from the excavation of drainage ditch systems on bacterial communities and biological contamination was studied in the water column and sediments of headwater, mid-stream, and mouth sites of the intertidal Oakdale Creek on Sapelo Island, GA. Community analysis was performed using the MiSeq Illumina platform and revealed that dredging was the cause of a significant rise in Proteobacteria, especially γ-proteobacteria. Targeted biological contaminants included fecal indicator bacteria, Enterococcus spp. (Entero-1), pathogens, Shigella spp. (ipaH), and Salmonella spp (invA), virulence associated genes (VG's) of pathogenic E. coli (eaeA, hlyD, stx1, stx2, and set1B), integrons (intI1, intI2), and tetracycline resistance genes (TRGs). Incidence and gene concentrations of Shigella spp., eaeA and set1B, and of TRGs increased 3-20 folds after the onset of dredging, and followed the dredging schedule. Principal Component Analysis suggested possible common carriers for Shigella spp., some TRGs, and the pathogenic E. coli eaeA gene. At the site of dredging, all of the above contaminants were detected at high concentrations. We concluded that excavation of roadside ditches caused significant changes in bacterial composition and a rise in incidence and concentrations of biological contaminants in the creek. The authors suggest a different approach for the maintenance of this material be explored.

  18. Sediment dynamics in Lagos Harbour reconnaissance on effects of dredging

    NARCIS (Netherlands)

    Vijverberg, T.; Reneerkens, M.J.J.; Winterwerp, J.C.; Scholl, O.; Haruna, Y.

    2012-01-01

    Due to economic growth, Lagos Harbour is expanding. Capital dredging is needed to allow larger vessels to call the port. As harbour siltation is already a problem, increase of maintenance dredging is a worry. In the past no data was available to understand the hydraulics and sediment transport to es

  19. Sediment dynamics in Lagos Harbour reconnaissance on effects of dredging

    NARCIS (Netherlands)

    Vijverberg, T.; Reneerkens, M.J.J.; Winterwerp, J.C.; Scholl, O.; Haruna, Y.

    2012-01-01

    Due to economic growth, Lagos Harbour is expanding. Capital dredging is needed to allow larger vessels to call the port. As harbour siltation is already a problem, increase of maintenance dredging is a worry. In the past no data was available to understand the hydraulics and sediment transport to es

  20. Dredging: Key Link in the Strategic National Defense

    Science.gov (United States)

    1993-04-15

    Ravenhill and Donald Rothchild, Politics and Society in Contempori.rv Africa. (Boulder, CO: Lynne Riehner Publishers, 1992), 279. 91nternational...Navigation Improvements on the Pacific Coast. Washington: Institute for Water Resources, 1983. Beeman & Associates. 1988. Detailed Study of Dredged Material...Land Disposal Alternatives. Ogden Beeman & Associates, Inc., Portland, Oregon. Beeman & Associates. 1990. Investigation of Dredged Material

  1. The WODA guidance paper on underwater sound from dredging (abstract)

    NARCIS (Netherlands)

    Thomsen, F.; Borsani, F.; Clarke, D.; Jong, C.A.F. de; Witt, P. de; Holtkamp, M.; Goethals, F.; San Martin, E.; Spadaro, P.; Raalte, G. van; Jensen, A.

    2013-01-01

    The World Organisation of Dredging Associations (WODA) has identified underwater sound as an environmental issue that needs further consideration. A WODA Expert Group on Underwater Sound (WEGUS) was established to provide a guidance paper on dredging sound, impact on aquatic biota and advice on unde

  2. Engineering Geology in International Dredging and Infrastructure: Keynote

    Science.gov (United States)

    Vlasblom, Willem J.

    Engineering geology supports the execution of dredging works in all stages. An industry that takes the full profit of his knowledge is the international dredging contractor. Based on own experiences the importance of his work is emphasised in a number of cases. Finally, a number of future developments in which he shall play an important role are highlighted.

  3. Beneficial Use of Dredge Materials for Soil Reconstruction and Development of Dredge Screening Protocols.

    Science.gov (United States)

    Koropchak, Sara C; Daniels, W Lee; Wick, Abbey; Whittecar, G Richard; Haus, Nick

    2016-01-01

    Upland placement of dredge sediments has the potential to provide beneficial reuse of suitable sediments for agricultural uses or urban soil reconstruction. However, the use of many dredge materials is limited by contaminants, and most established screening protocols focus on limiting major contaminants such as heavy metals and polycyclic aromatic hydrocarbons and generally ignore fundamental agronomic parameters. Since 2001, we have placed over 450,000 m of Potomac River fresh water dredge materials and 250,000 m of saline materials from various locations into monitored confined upland facilities in Charles City, VA, and documented their conversion to agricultural uses. Groundwater and soil quality monitoring has indicated no adverse effects from material placement and outstanding agricultural productivity for the freshwater materials. Once placed, saline materials rapidly leach and ripen with quick declines in pH, electrical conductivity, and sodicity, but potentials for local groundwater impacts must be considered. Our experience to date indicates that the most important primary screening parameter is acid-base accounting (potential acidity or lime demand), which should become a mandatory analytical requirement. Our second level of acceptance screening is based on a combination of federal and state residual waste and soil screening standards and basic agronomic principles. High silt+clay and total organic C may also limit rapid use of many dredge materials due to extended dewatering times and physical limitations. This dredge material screening system separates potential upland placement candidates into three soil quality management categories (unsuitable, suitable, and clean fill) with differing monitoring requirements. Similar use of these sediments in urban soil reconstruction is also recommended.

  4. INFLUENCE OF AGE ON SURVIVAL, LATE HYPERTENSION, AND RECOARCTATION IN ELECTIVE AORTIC COARCTATION REPAIR - INCLUDING LONG-TERM RESULTS AFTER ELECTIVE AORTIC COARCTATION REPAIR WITH A FOLLOW-UP FROM 25 TO 44 YEARS

    NARCIS (Netherlands)

    BROUWER, RMHJ; ERASMUS, ME; EBELS, T; EIJGELAAR, A

    1994-01-01

    The optimal age for elective repair of aortic coarctation is controversial. The optimal age should be associated with a minimal risk of recoarctation, late hypertension, and other cardiovascular disorders. The purpose of this retrospective study is to determine the actuarial survival after aortic co

  5. Ecological evaluation of proposed dredged material from Richmond Harbor

    Energy Technology Data Exchange (ETDEWEB)

    Pinza, M R; Ward, J A; Mayhew, H L; Word, J Q; Niyogi, D K; Kohn, N P [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1992-10-01

    During the summer of 1991, Battelle/Marine Sciences Laboratory (MSL) was contracted to conduct sampling and testing of sediments proposed for dredging of Richmond Harbor, California. The MSL collected sediment cores to a depth of [minus]40 ft MLLW ([minus]38 ft + 2 ft overdepth) from 28 (12-in. core) and 30 (4-in. core) stations. The sediment cores were allocated to six composite samples referred to as sediment treatments, which were then subjected to physical, chemical, toxicological, and bioaccumulation testing. Physical and chemical parameters included grain size, total organic carbon (TOC), total volatile solids (TVS), oil and grease, total petroleum hydrocarbons (TPH), polynuclear aromatic hydrocarbons (PAH), chlorinated pesticides, polychlorinated biphenyis (PCBs), priority pollutant metals, and butyltins. The results from the test treatments were compared to results from five reference treatments representative of potential in-bay and offshore disposal sites.

  6. Preliminary report on mercury geochemistry of placer gold dredge tailings, sediments, bedrock, and waters in the Clear Creek restoration area, Shasta County, California

    Science.gov (United States)

    Ashley, Roger P.; Rytuba, James J.; Rogers, Ronald; Kotlyar, Boris B.; Lawler, David

    2002-01-01

    Clear Creek, one of the major tributaries of the upper Sacramento River, drains the eastern Trinity Mountains. Alluvial plain and terrace gravels of lower Clear Creek, at the northwest edge of the Sacramento Valley, contain placer gold that has been mined since the Gold Rush by various methods including dredging. In addition, from the 1950s to the 1980s aggregate-mining operations removed gravel from the lower Clear Creek flood plain. Since Clear Creek is an important stream for salmon production, a habitat restoration program is underway to repair damage from mining and improve conditions for spawning. This program includes using dredge tailings to fill in gravel pits in the flood plain, raising the concern that mercury lost to these tailings in the gold recovery process may be released and become available to biota. The purposes of our study are to determine concentrations and speciation of mercury in sediments, tailings, and water in the lower Clear Creek area, and to determine its mobility. Mercury concentrations in bedrock and unmined gravels both within and above the mined area are low, and are taken to represent background concentrations. Bulk mercury values in flood-plain sediments and dry tailings are elevated to several times these background concentrations. Mercury in sediments and tailings is associated with fine size fractions. Although methylmercury levels are generally low in sediments, shallow ponds in the flood plain may have above-normal methylation potential. Stream waters in the area show low mercury and methylmercury levels. Ponds with elevated methylmercury in sediments have more methylmercury in their waters as well. One seep in the area is highly saline, and enriched in mercury, lithium, and boron, similar to connate waters that are expelled along thrust faults to the south on the west side of the Sacramento Valley. This occurrence suggests that mercury in waters may at least in part be from sources other than placer mining.

  7. Design of a GIS-based rating protocol to assess the potential for landfill closure using dredge material in post Hurricane Sandy New Jersey.

    Science.gov (United States)

    Miskewitz, Robert J; Barone, Daniel; Guterl, Sar J; Uchrin, Christopher G

    2017-05-12

    New Jersey is rapidly running out of capacity for storage of dredged material. A potential solution to this lack of storage space is to remove and reuse the dredged material for some beneficial use. Results from a Rutgers University project performed for the New Jersey Department of Transportation, Office of Maritime Resources, designed to assess the potential for closure of New Jersey landfills using dredge material from existing Confined Disposal Facilities (CDFs) are presented and discussed. The project included an update of the existing NJDEP landfill database, the development of a rating system to identify landfills with the highest potential to utilize dredged material for their closure, and the identification and preliminary investigation of the top candidate landfills based on this rating system.

  8. Ocean Dumping Report for Calendar Year 1984. Dredged Material.

    Science.gov (United States)

    1985-07-01

    PUERTO RICO PORT AUTHORITY 118 P-41 PORT OF LOS ANGELES 120 P-42 U.S. AIR FORCE / VANDENBERG 122 P-43 U.S. NAVY / SAN DIEGO 124 P-44 U.S. NAVY / SAN DIEGO...Parmittee: Puerto Rico Port Authority Date Issued: May 5, 1984 permit No. 84J-0678 Start Date: May 25,1984 Expiry Date: March 5, 1987 3. Country of origin...Dredges PADRE ISLAND and MANHATTAN ISLAND c. Mode of transportation: Hopper Dredge 5. Form in which dredged material is presented for disposal: Slurry

  9. Temporal Patterns in Seawater Quality from Dredging in Tropical Environments.

    Directory of Open Access Journals (Sweden)

    Ross Jones

    Full Text Available Maintenance and capital dredging represents a potential risk to tropical environments, especially in turbidity-sensitive environments such as coral reefs. There is little detailed, published observational time-series data that quantifies how dredging affects seawater quality conditions temporally and spatially. This information is needed to test realistic exposure scenarios to better understand the seawater-quality implications of dredging and ultimately to better predict and manage impacts of future projects. Using data from three recent major capital dredging programs in North Western Australia, the extent and duration of natural (baseline and dredging-related turbidity events are described over periods ranging from hours to weeks. Very close to dredging i.e. <500 m distance, a characteristic features of these particular case studies was high temporal variability. Over several hours suspended sediment concentrations (SSCs can range from 100-500 mg L-1. Less turbid conditions (10-80 mg L-1 can persist over several days but over longer periods (weeks to months averages were <10 mg L-1. During turbidity events all benthic light was sometimes extinguished, even in the shallow reefal environment, however a much more common feature was very low light 'caliginous' or daytime twilight periods. Compared to pre-dredging conditions, dredging increased the intensity, duration and frequency of the turbidity events by 10-, 5- and 3-fold respectively (at sites <500 m from dredging. However, when averaged across the entire dredging period of 80-180 weeks, turbidity values only increased by 2-3 fold above pre-dredging levels. Similarly, the upper percentile values (e.g., P99, P95 of seawater quality parameters can be highly elevated over short periods, but converge to values only marginally above baseline states over longer periods. Dredging in these studies altered the overall probability density distribution, increasing the frequency of extreme values. As

  10. Mussel dredging: Impact on epifauna in Limfjorden, Denmark

    DEFF Research Database (Denmark)

    Dolmer, Per

    2002-01-01

    Species composition and population density of epibenthos are described in two areas in Limfjorden, Denmark. Both areas covered both a mussel fishing ground and an area that has been permanently closed for mussel dredging since 1988. Furthermore, mussels were dredged in a part of the mussel fishin...... fished and control areas. Significant reductions in the amount of shell debris and gravel were observed in the dredged areas. The impact of the loss of these benthic structural components on ecosystem processes and functions is discussed....

  11. Assessment of ecotoxicological risks related to depositing dredged materials from canals in northern France on soil.

    Science.gov (United States)

    Perrodin, Yves; Babut, Marc; Bedell, Jean-Philippe; Bray, Marc; Clement, Bernard; Delolme, Cécile; Devaux, Alain; Durrieu, Claude; Garric, Jeanne; Montuelle, Bernard

    2006-08-01

    The implementation of an ecological risk assessment framework is presented for dredged material deposits on soil close to a canal and groundwater, and tested with sediment samples from canals in northern France. This framework includes two steps: a simplified risk assessment based on contaminant concentrations and a detailed risk assessment based on toxicity bioassays and column leaching tests. The tested framework includes three related assumptions: (a) effects on plants (Lolium perenne L.), (b) effects on aquatic organisms (Escherichia coli, Pseudokirchneriella subcapitata, Ceriodaphnia dubia, and Xenopus laevis) and (c) effects on groundwater contamination. Several exposure conditions were tested using standardised bioassays. According to the specific dredged material tested, the three assumptions were more or less discriminatory, soil and groundwater pollution being the most sensitive. Several aspects of the assessment procedure must now be improved, in particular assessment endpoint design for risks to ecosystems (e.g., integration of pollutant bioaccumulation), bioassay protocols and column leaching test design.

  12. The Four Rs of Environmental Dredging: Resuspension, Release, Residual, and Risk

    Science.gov (United States)

    2008-02-01

    included general guidance on environmental dredging (PIANC 1996, NRC 1997, 2000, 2007). One of the advantages commonly attributed to the removal of...spatial dimension of both exposures and effects will vary among receptor groups. Exposures to sessile or relatively immobile receptors will vary more...later, the average surficial concentrations dropped to 0.74 ppm due ERDC/EL TR-08-4 48 to an undefined mixture of enhanced and natural recovery

  13. Bayou Segnette Waterway Dredged Material Placement Study Preliminary Assessment: Summary of Findings and Recommendations

    Science.gov (United States)

    2013-03-01

    can enhance aquatic, wetland , and floodplain habitats. Some vegetation, such as floating and sub-aquatic vegetation, are sensitive to the quality...Pond, Lake Salvador shoreline (including the Lake Salvador Wetlands Creation site) oil and gas access canals, thin floating marsh adjacent to the...Extension Center. Mathies, and Russo. 2003. Wetlands Treatment to Address Ammonia Toxicity in the Dredging Process, Bayou Segnette Waterway, Louisiana

  14. Characterization of Underwater Sounds Produced by a Backhoe Dredge Excavating Rock and Gravel

    Science.gov (United States)

    2012-12-01

    the powerplant . Periodically, sounds may be produced when the dredge advances, either by raising and lowering spuds or by swinging along deployed...with their powerplants . The various underwater sounds produced are influenced by a host of factors, including substrate type, geomorphology of the...system was powered by a deep-cycle marine battery connected to a StatPower pure sine- wave inverter, which provided a 120V AC power source to an APC Smart

  15. Physical and biological impact on marine benthic Polychaetes due to dredging in the Mormugao harbour, Goa and its restoration after dredging

    Digital Repository Service at National Institute of Oceanography (India)

    Rathod, V.

    The proportion of gravel in the sediment of the dredged site increased after-dredging, while that of organic matter decreased The impact on community was estimated at species level, using both univariate and multivariate analyses Maximum negative effect...

  16. DISSIPATION OF PAHs IN SATURATED, DREDGED SEDIMENTS: A FIELD TRIAL

    Science.gov (United States)

    Sediments dredged from navigable rivers often contain elevated concentrations of recalcitrant, potentially toxic organic compounds such as polychlorinated biphenyls (PCBs) and polyaromatic hydrocarbons (PAHs). The presence of these compounds often requires that the sediments be stored in fully conta...

  17. Dredged Material Management Categories for Tracking Beneficial Use

    Science.gov (United States)

    2015-06-01

    rehandling for landfill cover , mine reclamation, construction fill, etc.) 4. Upland Disposal: DM placed in an up- land CDF for disposal with no...improve the use of sediments. Understanding the volume of dredged material relocated within the littoral system compared with the volume removed from the... littoral system is a critical component of RSM within a watershed system. The dredged material management categories presented distinguishes between

  18. Sediment Engineering thru Dredging and with Nature (SETDWN) - Fate of Fines in the Dredging and Placement Process

    Science.gov (United States)

    2015-05-15

    the littoral zone as a function of the dredge equipment and construction method and is intended to provide justification for a fundamental shift...will fulfill the RSM principle of retaining sand to the littoral zone . Methods Field samples were collected of the dredge inflow, overflow, beach...maintaining a greater mass of sediment in the littoral zone instead of offshore or in upland placement and saves money due to decreased pumping and

  19. Dredging for dilution: A simulation based case study in a Tidal River.

    Science.gov (United States)

    Bilgili, Ata; Proehl, Jeffrey A; Swift, M Robinson

    2016-02-01

    A 2-D hydrodynamic finite element model with a Lagrangian particle module is used to investigate the effects of dredging on the hydrodynamics and the horizontal dilution of pollutant particles originating from a wastewater treatment facility (WWTF) in tidal Oyster River in New Hampshire, USA. The model is driven by the semi-diurnal (M2) tidal component and includes the effect of flooding and drying of riverine mud flats. The particle tracking method consists of tidal advection plus a horizontal random walk model of sub-grid scale turbulent processes. Our approach is to perform continuous pollutant particle releases from the outfall, simulating three different scenarios: a base-case representing the present conditions and two different dredged channel/outfall location configurations. Hydrodynamics are investigated in an Eulerian framework and Lagrangian particle dilution improvement ratios are calculated for all cases. Results show that the simulated hydrodynamics are consistent with observed conditions. Eulerian and Lagrangian residuals predict an outward path suggesting flushing of pollutants on longer (>M2) time scales. Simulated dilution maps show that, in addition to dredging, the relocation of the WWTF outfall into the dredged main channel is required for increased dilution performance. The methodology presented here can be applied to similar managerial problems in all similar systems worldwide with relatively little effort, with the combination of Lagrangian and Eulerian methods working together towards a better solution. The statistical significance brought into methodology, by using a large number of particles (16000 in this case), is to be emphasized, especially with the growing number of networked parallel computer clusters worldwide. This paper improves on the study presented in Bilgili et al., 2006b, by adding an Eulerian analysis.

  20. Evaluation of dredged material proposed for ocean disposal from South Brother Island Channel, New York

    Energy Technology Data Exchange (ETDEWEB)

    Barrows, E.S.; Gardiner, W.W.; Antrim, L.D.; Gruendell, B.D.; Word, J.Q.; Tokos, J.J.S. [Battelle Marine Sciences Laboratory, Sequim, Washington (United States)

    1996-09-01

    South Brother Island Channel was one of seven waterways that the US Army Crops of Engineers-New York District requested the Battelle/Marine Sciences Laboratory to sample and evaluate for dredging and disposal. Tests and analyses were conducted on South Brother Island Channel sediment core samples and evaluations were performed. The evaluation of proposed dredged material from South Brother Island Channel included bulk sediment chemical analyses, chemical analyses of site water and elutriate, water-column and benthic acute toxicity tests, and bioaccumulation studies. Individual sediment core samples collected from Souther Brother Island Channel were analyzed for grain size, moisture content, and total organic carbon. a composite sediment sample, representing the entire area proposed for dredging, was analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl congers, polynuclear aromatic hydrocarbons, and 1,4- dichlorobenzene. Site water and elutriate water, prepared from the suspended-particle phase of South Brother Island Channel sediment, were analyzed for metals, pesticides, and PCBs.

  1. Evaluation of dredged material proposed for ocean disposal from Hudson River, New York

    Energy Technology Data Exchange (ETDEWEB)

    Gardiner, W.W.; Barrows, E.S.; Antrim, L.D.; Gruendell, B.D.; Word, J.Q.; Tokos, J.J.S. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1996-09-01

    The Hudson River (Federal Project No. 41) was one of seven waterways that the U.S. Army Corps of Engineers-New York District (USACE-NYD) requested the Battelle Marine Sciences Laboratory (MSL) to sample and evaluate for dredging and disposal in March 1994. Sediment samples were collected from the Hudson River. Tests and analyses were conducted on Hudson River sediment core samples. The evaluation of proposed dredged material from the Hudson River included bulk sediment chemical analyses, chemical analyses of site water and elutriate, water-column and benthic acute toxicity tests, and bioaccumulation studies. Individual sediment core samples collected from Hudson River were analyzed for grain size, moisture content, and total organic carbon (TOC). A composite sediment sample, representing the entire area proposed for dredging, was analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAH), and 1,4-dichlorobenzene. Site water and elutriate water, prepared from the suspended-particulate phase (SPP) of Hudson River sediment, were analyzed for metals, pesticides, and PCBS. Water-column or SPP toxicity tests were performed with three species. Benthic acute toxicity tests were performed. Bioaccumulation tests were also conducted.

  2. Using a sedimentation scanner to determine mangrove health responses to sedimentation derived from dredging. An example from northwestern Australia.

    Science.gov (United States)

    Mellor, Peter; Willson, Nicola; Claydon, Nadene; Paling, Erik I; Parker, Belinda; Wylie, Nicole; Mackey, Paul; Houridis, Harry

    2017-05-31

    A sedimentation scanner was used to measure daily sediment height at 10 sites associated with a 14 million cubic metre dredging project in Port Hedland harbour, Western Australia, between July 2011 and May 2012. Data were collected from seven potential impact sites, where up to 35 mm of additional sedimentation was predicted via modelling to result from dredging and at three reference sites, where background variation was monitored. A variety of mangrove habitat health indices from each site (including leaf area and health, pneumatophore and faunal burrow density) were collected before, during and after dredging. Despite predictions, most impact sites received between 0 and 10 mm over the dredging period, with one site experiencing a gain of 28 mm. Reference sites received between 2 and 28 mm which was attributed to natural processes. It was concluded that the health of Avicennia marina (Forssk.) Vierh. and Rhizophora stylosa Griff., the most common mangroves, were neither affected by a net sedimentation up to 28 mm of over a period of 11 months (i.e. 30.5 mm y(-1)) nor rapid changes over shorter time periods such as 14 mm over two days. This technology could be deployed in any tidally influenced sedimentary environment where short-term processes were of interest.

  3. DREDGED MATERIAL RECLAMATION AT THE JONES ISLAND CONFINED DISPOSAL FACILITY - ITER

    Science.gov (United States)

    In this SITE demonstration, phytoremediation technology was applied to contaminated dredged materials from the Jones Island Confined Disposal Facility (CDF) located in Milwaukee Harbor, Wisconsin. The Jones Island CDF receives dredged materials from normal maintenance of Milwauke...

  4. Impact of maintenance dredging on macrobenthic community structure of a tropical estuary

    Digital Repository Service at National Institute of Oceanography (India)

    Rehitha, T.V.; Ullas, N.; Vineetha, G.; Benny, P.Y.; Madhu, N.V.; Revichandran, C.

    quality showed relatively higher values (>0.24), which indicates the prevalence of poor environmental conditions in the dredging locations. The present study reveals the extent of impacts associated with maintenance dredging activities in a tropical...

  5. DECONTAMINATING AND PROCESSING DREDGED MATERIAL FOR BENEFICIAL USE

    Energy Technology Data Exchange (ETDEWEB)

    CLESCERI,N.L.; STERN,E.A.; FENG,H.; JONES,K.W.

    2000-07-01

    Management of contaminated dredged material is a major problem in the Port of New York and New Jersey. One component of an overall management plan can be the application of a decontamination technology followed by creation of a product suitable for beneficial use. This concept is the focus of a project now being carried out by the US Environmental Protection Agency-Region 2, the US Army Corps of Engineers-New York District, the US Department of Energy-Brookhaven National Laboratory, and regional university groups that have included Rensselaer Polytechnic Institute, Rutgers University, New Jersey Institute of Technology, and Stevens Institute of Technology. The project has gone through phased testing of commercial technologies at the bench scale (15 liters) and pilot scale (1.5--500 m{sup 3}) levels. Several technologies are now going forward to large-scale demonstrations that are intended to treat from 23,000 to 60,000 m{sup 3}. Selections of the technologies were made based on the effectiveness of the treatment process, evaluation of the possible beneficial use of the treated materials, and other factors. Major elements of the project are summarized here.

  6. Application of bioassays in toxicological hazard, risk and impact assessments of dredged sediments.

    Science.gov (United States)

    Schipper, C A; Rietjens, I M C M; Burgess, R M; Murk, A J

    2010-11-01

    Given the potential environmental consequences of dumped dredged harbour sediments it is vital to establish the potential risks from exposure before disposal at sea. Currently, European legislation for disposal of contaminated sediments at sea is based on chemical analysis of a limited number of well-known contaminants for which maximum acceptable concentrations, action levels (ALs), have been set. The present paper addresses the issue of the applicability of in vitro and in vivo bioassays for hazard, risk and local impact assessment of dredged polluted sediments to be disposed of at sea. It discusses how and to what extent selected bioassays can fill in the gaps left open by chemical analysis and the way in which the bioassays may contribute to the present licensing system for disposal. Three different purposes for application were distinguished: the most basic application (A) is a rapid determination of the hazard (potential toxicity) of dredged sediments which is then compared to ALs in a licensing system. As with chemical analysis on whole sediment extracts, the bioavailability of the chemicals is not taken into account. As in vitro assays with sediment extracts are not sensitive to matrix effects, a selection of specific in vitro bioassays can be suitable fast and standardized additions for the licensing system. When the outcome of (A) does not convincingly demonstrate whether the sediment is clean enough or too polluted, further bioanalysis can help the decision making process (B). More aspects of the mostly unknown complex chemical mixtures are taken into account, including the bioavailability and chronic toxicity focusing on ecologically relevant endpoints. The ecotoxicological pressure imposed by the dredged sediments can be quantified as the potentially affected fraction (PAF) based on chemical or biological analysis of levels of contaminants in sediment or biota. To validate the predicted risk, the actual impact of dumped harbour sediments on local

  7. Dredging: An Annotated Bibliography on Operations, Equipment, and Processes. Installment 3. Revision.

    Science.gov (United States)

    1985-01-01

    Installment 2 Bucket Wheels, Dredges, Draglines Strip and Mine at Billiton Suriname 0506 Newlyn Quay Gambles on ’No Spares’ Dredger 0552 564 P -o...0498 A Cutter Dredge A0002 Al Wassl Bay A0007 Amphibian Suction Dredger A0010 Aquarius, Latest Addition to the Fleet of Zanen Verstoep N.V. Built by...ticated Dredging Materials A0171 New Vessels A0231 . - o & K Dredging A0235 Odd Looking Amphibian A0237 Installment 3 Dual Capacity Advantage: Bucket

  8. Percutaneous mitral valve repair.

    Science.gov (United States)

    Gillinov, A Marc; Liddicoat, John R

    2006-01-01

    Surgical mitral valve repair is the procedure of choice to treat mitral regurgitation of all etiologies. Whereas annuloplasty is the cornerstone of mitral valve repair, a variety of other surgical techniques are utilized to correct dysfunction of the leaflets and subvalvular apparatus; in most cases, surgical repair entails application of multiple repair techniques in each patient. Preclinical studies and early human experience have demonstrated that some of these surgical repair techniques can be performed using percutaneous approaches. Specifically, there has been great progress in the development of novel technology to facilitate percutaneous annuloplasty and percutaneous edge-to-edge repair. The objectives of this report were to (1) discuss the surgical foundations for these percutaneous approaches; (2) review device design and experimental and clinical results of percutaneous valve repair; and (3) address future directions, including the key challenges of patient selection and clinical trial design.

  9. 76 FR 63547 - Security Zone; Columbia and Willamette Rivers, Dredge Vessels Patriot and Liberty

    Science.gov (United States)

    2011-10-13

    ... vessels are underway, anchored, or conducting dredging operations in the vicinity of Willamette River Mile... the Dredge Vessels Patriot and Liberty while they are anchored, underway, or conducting dredging... Instruction M16475.lD, which guide the Coast Guard in complying with the National Environmental Policy Act...

  10. Application of Long Distance Conveyance (LDC) of Dredged Sediments to Louisiana Coastal Restoration

    Science.gov (United States)

    2011-01-01

    Hydraulic Dredges Hopper Dredge Hydraulic suction, Hydraulic erosion, Mechanical dislodgement using knives or blades From bottom to dredge... runner ) that imparts energy to the slurry, (2) the volute (or case) that encloses the rotating impeller and slurry, (3) an opening in the center of

  11. Short-term impact of blue mussel dredging ( Mytilus edulis L.) on a benthic community

    DEFF Research Database (Denmark)

    Dolmer, Per; Kristensen, T.; Christiansen, M.L.

    2001-01-01

    outside the mussel beds just after dredging, but this effect lasted for less than 7 days. After dredging, brown shrimps, C. crangon invaded the dredged areas. This species is an important predator of smaller invertebrates, and it is suspected that it was feeding on small vulnerable polychaetes exposed...... to the boundary area. This indicates that the disturbance of the mussel bed structure reduced growth and that the lowering of intraspecific food competition caused by a reduced density of mussels did not increase the accumulation of biomass in the mussels which remained in the dredged area.......The short-term effect of mussel dredging in a brackish Danish sound was studied. A commercial dredging track was identified and an analysis of the species composition inside the track and at an adjacent control area showed that dredging changed the community structure by reducing the density...

  12. Decision support system for treatment of dredged sediments

    NARCIS (Netherlands)

    Joziasse, J.; Bakker, T.; Eggels, P.G.

    1998-01-01

    A decision support system for treatment of dredged sediments (DSTS) has been constructed, in which the environmental effects of various treatment options applied can be compared. The effects are evaluated by scores on environmental themes like global warming and acidification, using life cycle asses

  13. New Federal Regulations for Dredged and Fill Material

    Science.gov (United States)

    Smith, David D.

    1976-01-01

    Aided by Environmental Protection Agency (EPA) guidelines, the United States Army Corps of Engineers regulates the discharge of dredged and fill material, through a permit program, to all waters of the United States. This feature summarizes the key points of the Corps regulations and the EPA guidelines. (BT)

  14. Remediation of fine fractions of dredged sediments by flotation

    NARCIS (Netherlands)

    Mulleneers, H.A.E.; Mark, van der B.; Geraets, J.; Gelder, van B.; Bruning, H.; Rulkens, W.H.; Koopal, L.K.

    2002-01-01

    In the Netherlands, large quantities of contaminated dredged sludge have to be deposited or treated in the near future. Because of the large amounts of small particles involved, successful treatment is difficult. In this study a new flotation method on laboratory scale was used as an alternative

  15. Quantification of physical properties of dredged sediments during physical ripening

    NARCIS (Netherlands)

    Vermeulen, J.; Dijk, S.G.; Grotenhuis, J.T.C.; Rulkens, W.H.

    2005-01-01

    The soil formation process ripening can be used as a bioremediation technique for dredged sediments that are polluted with organic chemicals. Currently, data are lacking that quantify the effects of physical ripening on parameters that affect aerobic bioremediation. We quantified the effects of phys

  16. Electrochemical Remediation of Dredged Material for Beneficial Use

    DEFF Research Database (Denmark)

    Pedersen, Anne Juul; Gardner, Kevin H.

    2003-01-01

    electroosmotic flow occured (0.01 mL/cm2-hr) and that sediments were effectively dewatered. These experimental results suggest electrochemical techniques should be evaluated for full-scale treatment of dredged material for upland beneficial use and may also be applicable for treatment of material placed...

  17. Chemical Clarification Methods for Confined Dredged Material Disposal.

    Science.gov (United States)

    1983-07-01

    SCHEDULE 16. DISTRIBUTION STATEMENT (of this Report) Approvedl for publico release; distribution unlimited. 17. DISTRIBUTION STATEMENT (of the...136. Salinity. The salinity of the sediment water and the bottom water used to suspend and transport the dredged material must be mea- sured or

  18. GREAT I Study of the Upper Mississippi River. Technical Appendixes. Volume 2. Floodplain Management, Dredged Material Uses, Dredging Requirements.

    Science.gov (United States)

    1980-09-01

    The Impacts of Dredge Spoil Placement on the Upper Mississippi River. Luther College, Decorah, Iowa. Meritt, F. S. 1968. Standard Handbook for Civil...L, bend equal to the length of the towboat and tow (Figure 1). I fh± ,L- flection arrle is knoan for a particular condition, a reasonzL3v z;cu- rate

  19. Diaphragmatic hernia repair - slideshow

    Science.gov (United States)

    ... presentations/100014.htm Diaphragmatic hernia repair - series—Normal anatomy To use the sharing ... Overview The chest cavity includes the heart and lungs. The abdominal cavity includes the liver, the stomach, ...

  20. Tendon repair

    Science.gov (United States)

    Repair of tendon ... Tendon repair can be performed using: Local anesthesia (the immediate area of the surgery is pain-free) ... a cut on the skin over the injured tendon. The damaged or torn ends of the tendon ...

  1. [Effects of sediment dredging on benthos community structure and water quality in Zhushan Bay].

    Science.gov (United States)

    Liu, Guo-Feng; Zhang, Zhi-Yong; Liu, Hai-Qin; Zhong, Ji-Cheng; Yan, Shao-Hua; Fan, Cheng-Xin

    2010-11-01

    We surveyed the changes of macro-benthos community composition and nutrients concentration in water in Zhushan Bay after it had been dredged 6 months, which aimed to remove the polluted surface sediments. The results showed that the main benthos in the dredged and un-dredged sediments were Limodrilus hoffmeisteri, Pelopia and Bellamya aeruginosa; compared to the un-dredged sediments, the bio-diversity of dredged areas became lower. However, its biomass became higher than that in un-dredged areas. Concentration range changes of TN and TP in overlying water was 1.64-4.45 mg/L and 0.133-0.258 mg/L, respectively. The post-dredged sediments were still in a higher state of nutrients for the higher concentration nutrients in overlying water, macro-benthos were the species that lived in a serious polluted water environment. Using Shannon-Weaver, Simpson, and Goodnight benthic index to evaluate the results show that the dredged area is in the moderately polluted level, but un-dredged area is in the middle-heavily polluted level. According to the benthos fauna surveys and water quality monitoring results, the effective of sediment dredging could play its role only the strict control on the external pollution resources have been made and reduces the effects of polluted water on the sediments.

  2. DNA repair protocols

    DEFF Research Database (Denmark)

    Bjergbæk, Lotte

    In its 3rd edition, this Methods in Molecular Biology(TM) book covers the eukaryotic response to genomic insult including advanced protocols and standard techniques in the field of DNA repair. Offers expert guidance for DNA repair, recombination, and replication. Current knowledge of the mechanisms...... that regulate DNA repair has grown significantly over the past years with technology advances such as RNA interference, advanced proteomics and microscopy as well as high throughput screens. The third edition of DNA Repair Protocols covers various aspects of the eukaryotic response to genomic insult including...... recent advanced protocols as well as standard techniques used in the field of DNA repair. Both mammalian and non-mammalian model organisms are covered in the book, and many of the techniques can be applied with only minor modifications to other systems than the one described. Written in the highly...

  3. Aircraft Metal Skin Repair and Honeycomb Structure Repair; Sheet Metal Work 3: 9857.02.

    Science.gov (United States)

    Dade County Public Schools, Miami, FL.

    The course helps students determine types of repairs, compute repair sizes, and complete the repair through surface protection. Course content includes goals, specific objectives, protection of metals, repairs to metal skin, and honeycomb structure repair. A bibliography and post-test are appended. A prerequisite for this course is mastery of the…

  4. Dredged bedrock samples from the Amerasia Basin, Arctic Ocean

    Science.gov (United States)

    Brumley, K. J.; Mukasa, S. B.; O'Brien, T. M.; Mayer, L. A.; Chayes, D. N.

    2013-12-01

    Between 2008-2012, as part of the U.S. Extended Continental Shelf project in the Amerasia Basin, Arctic Ocean, 17 dredges were successfully collected sampling the first rock outcrops in the Chukchi Borderland and surrounding regions for the purpose of describing the geologic nature of the bathymetric features in this area. Multiple lines of evidence indicate that the specimens were collected from submarine rock exposures and were not samples of ice rafted debris, common in the ice covered waters of the Arctic Ocean. Using the USCGC Healy, each dredge was collected along very steep slopes (>35 degrees) measured with high resolution multibeam swath bathymety data. Each haul yielded samples of similar lithologies and identical metamorphic grade with manganese crusts on the surfaces exposed to seawater and fresh surfaces where the rocks were broken from outcrop. High tension pulls on the dredge line also indicated sampling of bedrock exposures. Dredged samples from a normal fault scarp in the central Chukchi Borderland consisted of Silurian (c. 430 Ma) orthogneisses that intruded older (c. 487-500 Ma) gabbros and luecogranties that were all metamorphosed to amphibolite grade (Brumley et al., 2011). Samples from the northern Northwind Ridge consisted of metasediments (greenschist facies) interpreted to have been deposited in a proximal arc setting with detrital zircon U-Pb age peaks at 434, 980 Ma with lesser peaks between 500-600, 1100-2000 Ma, and rare 2800 Ma grains (Brumley et al, 2010). Other dredges in the region of the Northwind Ridge yielded deformed and metamorphosed calcareous sandstones and low-grade phyllites (O'Brien et al., 2013). Taken together these rocks indicate a relationship to the Pearya Terrane of northern Ellesmere Island and S.W. Svalbard that were thought to represent a Cambro-Ordovician volcanic arc terrane that was involved in Caledonian orogenesis (Brumley et al., 2011). These findings constrain plate tectonic reconstruction models and bring

  5. Risk-based decision-making framework for the selection of sediment dredging option.

    Science.gov (United States)

    Manap, Norpadzlihatun; Voulvoulis, Nikolaos

    2014-10-15

    The aim of this study was to develop a risk-based decision-making framework for the selection of sediment dredging option. Descriptions using case studies of the newly integrated, holistic and staged framework were followed. The first stage utilized the historical dredging monitoring data and the contamination level in media data into Ecological Risk Assessment phases, which have been altered for benefits in cost, time and simplicity. How Multi-Criteria Decision Analysis (MCDA) can be used to analyze and prioritize dredging areas based on environmental, socio-economic and managerial criteria was described for the next stage. The results from MCDA will be integrated into Ecological Risk Assessment to characterize the degree of contamination in the prioritized areas. The last stage was later described using these findings and analyzed using MCDA, in order to identify the best sediment dredging option, accounting for the economic, environmental and technical aspects of dredging, which is beneficial for dredging and sediment management industries.

  6. POLLUTION ASSESSMENT IN DREDGING SEDIMENT FROM HARBOR AREAS OF THE CIENFUEGOS BAY (CUBA

    Directory of Open Access Journals (Sweden)

    Anabell Pulido Caraballé

    2016-04-01

    Full Text Available The characterization of the dredging sediments is essential for environmental license, control and planning in dredging harbors. Sediment pollution was study in two harbor areas of the Cienfuegos Bay. Dredging sediments from “Camilo Cienfuegos” Refinery port and from area IX of Cienfuegos harbor were characterized. In order to evaluate dredging sediment quality, an analysis of water content, grain size, organic matter and trace metals was done. The results show that the trace elements in the sediments are at natural levels. Due to the absent of Cuban rules for these topics, international criteria for sampling, analysis and sediment quality evaluation were used in the study. Results show that these levels can be considered as typical for harbor areas in which authorization for dredging activities in docks and navigation channel should be granted. The results and methodologies will be applied in others Cuban harbors and navigation channel during the environmental license of dredging sediments.

  7. Management of Dredging Projects; Summary Repot for Technical Area 5

    Science.gov (United States)

    1996-02-01

    Mr. Robert H. Campbell (re- tired), HQUSACE. This summary report was compiled by Dr. Lyndell Z. Hales, Coastal En- gineering Research Center (CERC...conditions conform to a predetermined and quan- tifiable standard or baseline ). Unreasonable degradation and unacceptable adverse effects are defined, and...assigned to the Euro- pean and Pacific theaters. The dredges Comstock, Harding, Hoffman, Mar- shall, Minqual, and Rossell all served in the European

  8. Dredging: An Annotated Bibliography on Operations, Equipment, and Processes. Revision.

    Science.gov (United States)

    1982-03-01

    angle to horizontal boundary. Experimental results conformed to theo - retical for initial flow conditions when viscous effects were small. Viscous...Evolution of dredging company structures and present organizational re- quirements are discussed. 0208 JANSEN , H. J. 1978 (May). "A Trailing Suction...and remote measurement of turbidity. 0672 JANSEN , H. J. 1979 (Jun). "Dredger Doubles as Oil Recovery Ves- sel," Ocean Industry, Vol 14, No. 6, pp 83

  9. Repairs of composite structures

    Science.gov (United States)

    Roh, Hee Seok

    Repair on damaged composite panels was conducted. To better understand adhesively bonded repair, the study investigates the effect of design parameters on the joint strength. The design parameters include bondline length, thickness of adherend and type of adhesive. Adhesives considered in this study were tested to measure their tensile material properties. Three types of adhesively bonded joints, single strap, double strap, and single lap joint were considered under changing bondline lengths, thickness of adherend and type of adhesive. Based on lessons learned from bonded joints, a one-sided patch repair method for composite structures was conducted. The composite patch was bonded to the damaged panel by either film adhesive FM-73M or paste adhesive EA-9394 and the residual strengths of the repaired specimens were compared under varying patch sizes. A new repair method using attachments has been suggested to enhance the residual strength. Results obtained through experiments were analyzed using finite element analysis to provide a better repair design and explain the experimental results. It was observed that the residual strength of the repaired specimen was affected by patch length. Method for rapid repairs of damaged composite structures was investigated. The damage was represented by a circular hole in a composite laminated plate. Pre-cured composite patches were bonded with a quick-curing commercial adhesive near (rather than over) the hole. Tensile tests were conducted on specimens repaired with various patch geometries. The test results showed that, among the methods investigated, the best repair method restored over 90% of the original strength of an undamaged panel. The interfacial stresses in the adhesive zone for different patches were calculated in order to understand the efficiencies of the designs of these patch repairs. It was found that the composite patch that yielded the best strength had the lowest interfacial peel stress between the patch and

  10. SURVIVAL ESTIMATES OF BYCATCH INDIVIDUALS DISCARDED FROM BIVALVE DREDGES

    Directory of Open Access Journals (Sweden)

    Francisco Leitão

    2014-12-01

    Full Text Available The fate of released bycatch is an issue of great interest for fisheries research and management. Survival experiments were carried out to assess the survival capacity of animals damaged and discarded during clam dredging operations. Three common bycatch species, two fish (Trachinus vipera; Dicologlossa cuneata and one crab (Polybius henslowii, were collected during the sorting of catches from a commercial dredging boat. An arbitrary score scale was used to quantify the type and extent of damage to the organisms. Onboard, damaged individuals were placed in tanks containing seawater which were subsequently transferred to the laboratory. Survival experiments were conducted during the subsequent 48h. D. cuneata exhibited the lowest mortality after 48h (54%, followed by P. henslowii (65% and T. vipera (81%. Despite the magnitude of the percentage mortalities determined, the average number of individuals estimated to die during a 15 minutes tow (standard commercial fishing time was relatively small: 1.2, 3.24 and 11 for D. cuneata, T. vipera and P. henslowii, respectively. Nevertheless, when these figures are extrapolated to cover all the dredging fleet the impact of this practice on the populations of the species studied can be significant, particulary for D. cuneata.

  11. White dwarf evolutionary sequences for low-metallicity progenitors: The impact of third dredge-up

    CERN Document Server

    Althaus, Leandro G; Bertolami, Marcelo M Miller; Córsico, Alejandro H; García-Berro, Enrique

    2015-01-01

    We present new white dwarf evolutionary sequences for low-metallicity progenitors. White dwarf sequences have been derived from full evolutionary calculations that take into account the entire history of progenitor stars, including the thermally-pulsing and the post-asymptotic giant branch phases. We show that for progenitor metallicities in the range 0.00003--0.001, and in the absence of carbon enrichment due to the occurrence of a third dredge-up episode, the resulting H envelope of the low-mass white dwarfs is thick enough to make stable H burning the most important energy source even at low luminosities. This has a significant impact on white dwarf cooling times. This result is independent of the adopted mass-loss rate during the thermally-pulsing and post-AGB phases, and the planetary nebulae stage. We conclude that in the absence of third dredge-up episodes, a significant part of the evolution of low-mass white dwarfs resulting from low-metallicity progenitors is dominated by stable H burning. Our study...

  12. Evaluation of Regional Sediment Management Actions Using Government Shallow Draft Dredges

    Science.gov (United States)

    2013-03-01

    USACE clamshell bucket dredge SNELL. ERDC/CHL CHETN-XIV-26 March 2013 4 DISCUSSION. The shallow draft dredge fleet efficiently and cost...The SNELL, a utility vessel equipped with a clamshell bucket for mechanical dredging. This vessel also has a submersible pump that can be used for...such as the SNELL’s, taking suction from their hoppers and pumping ashore; or  Dedicated pump-out equipment, mounted/installed on each vessel, to

  13. A Guide for Using Geochemical Methods in Dredged Material, Sediment Tracking, and Sediment Budget Studies

    Science.gov (United States)

    2017-06-26

    ER D C TR -1 7- 3 Dredging Operations and Environmental Research Program A Guide for Using Geochemical Methods in Dredged Material...Jennifer M. Seiter, Mark A . Chappell, and Brandon Lafferty June 2017 Approved for public release; distribution is unlimited. The U.S. Army...June 2017 A Guide for Using Geochemical Methods in Dredged Material, Sediment Tracking, and Sediment Budget Studies Heidi M. Wadman Coastal and

  14. Bladder exstrophy repair

    Science.gov (United States)

    Bladder birth defect repair; Everted bladder repair; Exposed bladder repair; Repair of bladder exstrophy ... Bladder exstrophy repair involves two surgeries. The first surgery is to repair the bladder and the second one is to attach ...

  15. Dredging impact on an urbanized Florida bayou: effects on benthos and algal-periphyton.

    Science.gov (United States)

    Lewis, M A; Weber, D E; Stanley, R S; Moore, J C

    2001-01-01

    Environmental effects of dredging events have been uncommonly reported for shallow, residential estuaries characteristic of the Gulf of Mexico region. The objective of this study was to determine the impact of hydraulic dredging on an urbanized estuary. Physicochemical quality, benthic community composition, whole sediment toxicity, periphytic algal community composition and trace metal tissue quality were determined prior to and after dredging. The effects on surface water pH, dissolved oxygen, and temperature were negligible but photosynthetically active radiation was decreased at several stations. Dredging significantly reduced benthic diversity and density (P < 0.05). However, the sediments were not acutely toxic to the epibenthic, Americamysis bahia (formerly Mysidopsis bahia); survival averaged 93% (post-dredging) and to 98% (pre-dredging). There were several post-dredging taxonomic structural changes in the diatom-dominated, periphyton community but differences in mean density and three diversity indices were not significant. Trace metal concentration in periphyton after dredging were reduced from an average of 4-65% and significantly for mercury, zinc and chromium in several areas. It was concluded that the environmental impact of small-scale dredging events in urbanized near-coastal areas, based on the selected parameters, are likely to be localized and of short-term environmental consequence. The choice of the target biota, response parameters and chemical analysis are important considerations in the environmental impact assessment of these periodic episodic events.

  16. Dredging Operations Technical Support Program. General Decisionmaking Framework for Management of Dredged Material: Example Application to Commencement Bay, Washington.

    Science.gov (United States)

    1991-06-01

    Nieuwenhuize, Delta Institute of Hydrobiological Research, The Netherlands; Dr. M. Johnson, University of Liverpool, United Kingdom; Dr. J. Marquenie...effects. 65. Hill, Myers, and Brannon (1988) reviewed state-of-the-art leaching procedures for potential application to dredged material. Various topics ...Two-level Approach," USAE Commit- tee on Water Quality, Sixth Seminar - Proceedings, 25-27 February, 1986, New Orleans, LA (in preparation), Hydrologic

  17. Dredging Operations Technical Support Program. Aquaculture in Dredged Material Containment Areas, Proceedings Held at Galveston, Texas on September 1982.

    Science.gov (United States)

    1983-10-01

    guppy (Poecilia reticulata) ponds in my yard. In cage culture , a * species that controls fouling on the meshes is useful. Some unlikely combinations...Species Suitable for Containment Site Culture (Fresh Water). P002 134 Mariculture Potential Along the Northern Gulf Coast. P002 135 Economics of...Corps of Engineers during the Dredged Material Research Program. In 1976, Dow Chemical Co., under contract to the Corps, successfully cultured a crop

  18. A parameter model for dredge plume sediment source terms

    Science.gov (United States)

    Decrop, Boudewijn; De Mulder, Tom; Toorman, Erik; Sas, Marc

    2017-01-01

    The presented model allows for fast simulations of the near-field behaviour of overflow dredging plumes. Overflow dredging plumes occur when dredging vessels employ a dropshaft release system to discharge the excess sea water, which is pumped into the trailing suction hopper dredger (TSHD) along with the dredged sediments. The fine sediment fraction in the loaded water-sediment mixture does not fully settle before it reaches the overflow shaft. By consequence, the released water contains a fine sediment fraction of time-varying concentration. The sediment grain size is in the range of clays, silt and fine sand; the sediment concentration varies roughly between 10 and 200 g/l in most cases, peaking at even higher value with short duration. In order to assess the environmental impact of the increased turbidity caused by this release, plume dispersion predictions are often carried out. These predictions are usually executed with a large-scale model covering a complete coastal zone, bay, or estuary. A source term of fine sediments is implemented in the hydrodynamic model to simulate the fine sediment dispersion. The large-scale model mesh resolution and governing equations, however, do not allow to simulate the near-field plume behaviour in the vicinity of the ship hull and propellers. Moreover, in the near-field, these plumes are under influence of buoyancy forces and air bubbles. The initial distribution of sediments is therefore unknown and has to be based on crude assumptions at present. The initial (vertical) distribution of the sediment source is indeed of great influence on the final far-field plume dispersion results. In order to study this near-field behaviour, a highly-detailed computationally fluid dynamics (CFD) model was developed. This model contains a realistic geometry of a dredging vessel, buoyancy effects, air bubbles and propeller action, and was validated earlier by comparing with field measurements. A CFD model requires significant simulation times

  19. Electroosmotic dewatering of dredged sediments: bench-scale investigation.

    Science.gov (United States)

    Reddy, Krishna R; Urbanek, Adam; Khodadoust, Amid P

    2006-01-01

    The Indiana Harbor (Indiana, USA) has not been dredged since 1972 due to lack of a suitable disposal site for dredged sediment. As a result of this, over a million cubic yards of highly contaminated sediment has accumulated in the harbor. Recently, the United States Army Corps of Engineers (USACE) has selected a site for the confined disposal facility (CDF) and is in the process of designing it. Although dredging can be accomplished rapidly, the disposal in the CDF has to be done slowly to allow adequate time for consolidation to occur. The sediment possesses very high moisture content and very low hydraulic conductivity, which cause consolidation to occur slowly. Consolidation of the sediment is essential in order to achieve adequate shear strength of sediments and also to provide enough air space to accommodate the large amount of sediment that requires disposal. Currently, it has been estimated that if a one 3-foot (0.9-m) thick layer of sediment was disposed of at the CDF annually, it would take approximately 10 years to dispose of all the sediment that is to be dredged from the Indiana Harbor. This study investigated the feasibility of using an electroosmotic dewatering technology to accelerate dewatering and consolidation of sediment, thereby allowing more rapid disposal of sediment into the CDF. Electroosmotic dewatering essentially involves applying a small electric potential across the sediment layer, thereby inducing rapid flow as a result of physico-chemical and electrochemical processes. A series of bench-scale electrokinetic experiments were conducted on actual dredged sediment samples from the Indiana Harbor to investigate dewatering rates caused by gravity alone, dewatering rates caused by gravity and electric potential, and the effects of the addition of polymer flocculants on dewatering of the sediments. The results showed that electroosmotic dewatering under an applied electric potential of 1.0VDC/cm could increase the rate of dewatering and

  20. Modeling of Motion of Particle Clouds Formed by Dumping Dredged Material

    Institute of Scientific and Technical Information of China (English)

    YING Xinya(应新亚); Juichiro AKIYAMA; MAO Genhai(毛根海)

    2001-01-01

    The motion of particle clouds formed by dumping dredged material into quiescent waters is experimentally and numerically studied. In the numerical model, the particle phase is modeled by the dispersion model, and turbulence is calculated by the large eddy simulation. The governing equations, including the filtered Navier-Stokes equations and mass transport equation, are solved based on the operator-splitting algorithm and an implicit cubic spline interpolation scheme. The eddy viscosity is evaluated by the modified Smagorinsky model including the buoyancy term. Comparisons of main flow characteristics, including shape, size, average density excess, moving speed and the amount of particles deposited on the bed, between experimental and computational results show that the numerical model well predicts the motion of the cloud from the falling to spreading stage. The effects of silt-fence on the motion of the particle cloud are also investigated.

  1. Bus Yards and Repair Facilities, Local Buildings - Bus shop is included in local buildings layer, Published in 2008, 1:2400 (1in=200ft) scale, Effingham County Board Of Commissioners.

    Data.gov (United States)

    NSGIC GIS Inventory (aka Ramona) — This Bus Yards and Repair Facilities dataset, published at 1:2400 (1in=200ft) scale, was produced all or in part from Orthoimagery information as of 2008. It is...

  2. Three-dimensional visualization maps of suspended-sediment concentrations during placement of dredged material in 21st Avenue West Channel Embayment, Duluth-Superior Harbor, Duluth, Minnesota, 2015

    Science.gov (United States)

    Groten, Joel T.; Ellison, Christopher A.; Mahoney, Mollie H.

    2016-06-30

    Excess sediment in rivers and estuaries poses serious environmental and economic challenges. The U.S. Army Corps of Engineers (USACE) routinely dredges sediment in Federal navigation channels to maintain commercial shipping operations. The USACE initiated a 3-year pilot project in 2013 to use navigation channel dredged material to aid in restoration of shoreline habitat in the 21st Avenue West Channel Embayment of the Duluth-Superior Harbor. Placing dredged material in the 21st Avenue West Channel Embayment supports the restoration of shallow bay aquatic habitat aiding in the delisting of the St. Louis River Estuary Area of Concern.The U.S. Geological Survey, in cooperation with the USACE, collected turbidity and suspended-sediment concentrations (SSCs) in 2014 and 2015 to measure the horizontal and vertical distribution of SSCs during placement operations of dredged materials. These data were collected to help the USACE evaluate the use of several best management practices, including various dredge material placement techniques and a silt curtain, to mitigate the dispersion of suspended sediment.Three-dimensional visualization maps are a valuable tool for assessing the spatial displacement of SSCs. Data collection was designed to coincide with four dredged placement configurations that included periods with and without a silt curtain as well as before and after placement of dredged materials. Approximately 230 SSC samples and corresponding turbidity values collected in 2014 and 2015 were used to develop a simple linear regression model between SSC and turbidity. Using the simple linear regression model, SSCs were estimated for approximately 3,000 turbidity values at approximately 100 sampling sites in the 21st Avenue West Channel Embayment of the Duluth-Superior Harbor. The estimated SSCs served as input for development of 12 three-dimensional visualization maps.

  3. Changes in water quality at Cochin harbour dredging site, south west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Joseph, T.; Balachandran, K.K.; Nair, M.; Venugopal, P.; Sankaranarayanan, V.N.

    The water quality in the vicinity of the dredging did not show any appreciable change. All dissolved nutrients recorded sharp changes in the water column. After 20 minutes and 2 hours, the conditions at the dredging were much different from the pre...

  4. Dredged sediments as a resource for brick production: Possibilities and barriers from a consumers’ perspective

    Energy Technology Data Exchange (ETDEWEB)

    Cappuyns, Valérie, E-mail: valerie.cappuyns@kuleuven.be; Deweirt, Valentine; Rousseau, Sandra

    2015-04-15

    Highlights: • Consumers are suspicious towards bricks produced from dredged sediments. • Technical quality, safety and environmental impacts are considered key characteristics. • Public has insufficient knowledge on bricks produced from dredged sediments. • Sensitization and provision of information to customers are of primary importance. - Abstract: A possible solution for the oversupply of dredged sediments is their use as a raw material in brick production. Despite the fact that several examples (e.g., Agostini et al., 2007; Hamer and Karius, 2002; Xu et al., 2014) show that this application is feasible, some economic, technical and social limitations interfere with the development of a market of dredged materials in brick production in Flanders. While we describe the main characteristics of the supply side, we focus on the limitations and barriers from the demand side in the present study. Based on a consumers survey we analyze consumers’ risk perceptions and attitudes towards bricks produced from dredged sediments. Consumers in Flanders are rather suspicious with respect to bricks produced from dredged sediments and their risk perception is mainly determined by the possibility of a bad bargain (brick of inferior quality) and the connotation with chemical contamination. The willingness to pay for bricks made from dredged sediments is mainly influenced by the age of the respondents, as well environmental awareness, and the respondents’ belief in their ability to influence environmental problems. Sensitization and information of customers seems to be of primary importance to make dredged-sediment-derived bricks a successful product.

  5. 78 FR 20316 - Final Issuance of General NPDES Permits (GP) for Small Suction Dredges in Idaho

    Science.gov (United States)

    2013-04-04

    ... From the Federal Register Online via the Government Publishing Office ENVIRONMENTAL PROTECTION AGENCY Final Issuance of General NPDES Permits (GP) for Small Suction Dredges in Idaho AGENCY... placer mining operations in Idaho for small suction dredges (intake nozzle size of 5 inches in diameter...

  6. 77 FR 25717 - Proposed Issuance of a General NPDES Permit for Small Suction Dredging

    Science.gov (United States)

    2012-05-01

    ... From the Federal Register Online via the Government Publishing Office ENVIRONMENTAL PROTECTION AGENCY Proposed Issuance of a General NPDES Permit for Small Suction Dredging AGENCY: Environmental... mining operations in Idaho for small suction dredges (intake nozzle size of 5 inches in diameter or a...

  7. Dispersion of suspended material from an operating sand suction dredge in the Øresund (Denmark)

    DEFF Research Database (Denmark)

    Kiørboe, Thomas; Møhlenberg, F.

    1981-01-01

    The concentration of suspended material in the immediate vicinity of an operating sand suction dredge in the Oresund was 3-5000mg/l. Concentrations > 100 mg/l were restricted to a downstream distance of .apprx. 150m and ambient levels were reached within .apprx. 1 km of the dredge. The natural...

  8. Ripening of clayey dredged sediments during temporary upland disposal, A Bioremediation technique.

    NARCIS (Netherlands)

    Vermeulen, J.; Grotenhuis, J.T.C.; Joziasse, J.; Rulkens, W.H.

    2003-01-01

    Background and Goal. In the Netherlands about 40 million m3 of sediment has to be dredged annually for both maintenance and environmental reasons. Temporary upland disposal is the most widely adopted alternative for dredged sediments worldwide. For good management of temporary disposal sites, knowle

  9. Effects of suction-dredging for cockles on non-target fauna in the Wadden Sea

    NARCIS (Netherlands)

    Hiddink, JG

    2003-01-01

    Suction dredging for cockles removes large cockles from tidal flats and may also cause mortality of non-target fauna and make the habitat less suitable for some species. This study examines whether suction dredging for cockles on tidal flats of the Dutch Wadden Sea had affected densities of non-targ

  10. Ripening of clayey dredged sediments during temporary upland disposal, A Bioremediation technique.

    NARCIS (Netherlands)

    Vermeulen, J.; Grotenhuis, J.T.C.; Joziasse, J.; Rulkens, W.H.

    2003-01-01

    Background and Goal. In the Netherlands about 40 million m3 of sediment has to be dredged annually for both maintenance and environmental reasons. Temporary upland disposal is the most widely adopted alternative for dredged sediments worldwide. For good management of temporary disposal sites,

  11. 40 CFR 230.60 - General evaluation of dredged or fill material.

    Science.gov (United States)

    2010-07-01

    ... Evaluation and Testing § 230.60 General evaluation of dredged or fill material. The purpose of these... 40 Protection of Environment 24 2010-07-01 2010-07-01 false General evaluation of dredged or fill material. 230.60 Section 230.60 Protection of Environment ENVIRONMENTAL PROTECTION AGENCY (CONTINUED) OCEAN...

  12. Improvement of Saemangeum Dredged Soils Using Coffee Sludge for Vegetation Soil

    Directory of Open Access Journals (Sweden)

    Daehyeon Kim

    2016-01-01

    Full Text Available In Korea, a large scale national project (Saemangeum Project has been underway that requires a huge amount of dredged soils and their reclamation. Although a lot of dredged soil is needed for reclamation, only about 10% of the dredged soil is used. For this reason, much effort should be made to extensively use the dredged soil. The objective of the study is to find reasonable ways of improving the dredged soils in the Saemangeum area so that they can be used for vegetation of land plants. In order to develop ameliorating methods, we treated silty sand samples, the representative dredged soil of Saemangeum, with mountain soil (0% and 30%, sawdust fertilizer (0% and 6%, bioameliorant (0% and 6%, and coffee sludge (3%, 6%, and 9%, measured the germination rate of bent grass, and applied the lab experiment results to the field for validation. As a result, it was verified that when a mixture of coffee sludge and sawdust fertilizer was used, the chemical and physical properties of dredged soil were significantly improved. This implies that the beneficial use of the dredged soil can be facilitated.

  13. Improvement of Operations and Maintenance Techniques Program. Literature Review and Technical Evaluation of Sediment Resuspension during Dredging

    Science.gov (United States)

    1991-01-01

    of the Seventh World Dredging Conference, WODCON VII, San Francisco, CA, pp 183-206. Kaneko, A., Watari , Y., and Aritomi, N. 1984. "Specialized...ecosystem. Kaneko, A., Watari , Y., and Aritomi, N. 1984 (Jul). "Specialized Dredges Designed for Bottom Sediment Dredging," Management of Bottom

  14. Dredging in the Spratly Islands: Gaining Land but Losing Reefs.

    Science.gov (United States)

    Mora, Camilo; Caldwell, Iain R; Birkeland, Charles; McManus, John W

    2016-03-01

    Coral reefs on remote islands and atolls are less exposed to direct human stressors but are becoming increasingly vulnerable because of their development for geopolitical and military purposes. Here we document dredging and filling activities by countries in the South China Sea, where building new islands and channels on atolls is leading to considerable losses of, and perhaps irreversible damages to, unique coral reef ecosystems. Preventing similar damage across other reefs in the region necessitates the urgent development of cooperative management of disputed territories in the South China Sea. We suggest using the Antarctic Treaty as a positive precedent for such international cooperation.

  15. Dredging in the Spratly Islands: Gaining Land but Losing Reefs.

    Directory of Open Access Journals (Sweden)

    Camilo Mora

    2016-03-01

    Full Text Available Coral reefs on remote islands and atolls are less exposed to direct human stressors but are becoming increasingly vulnerable because of their development for geopolitical and military purposes. Here we document dredging and filling activities by countries in the South China Sea, where building new islands and channels on atolls is leading to considerable losses of, and perhaps irreversible damages to, unique coral reef ecosystems. Preventing similar damage across other reefs in the region necessitates the urgent development of cooperative management of disputed territories in the South China Sea. We suggest using the Antarctic Treaty as a positive precedent for such international cooperation.

  16. Dredging in the Spratly Islands: Gaining Land but Losing Reefs

    Science.gov (United States)

    Mora, Camilo; Caldwell, Iain R.; Birkeland, Charles; McManus, John W.

    2016-01-01

    Coral reefs on remote islands and atolls are less exposed to direct human stressors but are becoming increasingly vulnerable because of their development for geopolitical and military purposes. Here we document dredging and filling activities by countries in the South China Sea, where building new islands and channels on atolls is leading to considerable losses of, and perhaps irreversible damages to, unique coral reef ecosystems. Preventing similar damage across other reefs in the region necessitates the urgent development of cooperative management of disputed territories in the South China Sea. We suggest using the Antarctic Treaty as a positive precedent for such international cooperation. PMID:27031949

  17. Health risk assessment linked to filling coastal quarries with treated dredged seaport sediments

    Energy Technology Data Exchange (ETDEWEB)

    Perrodin, Yves, E-mail: yves.perrodin@entpe.fr [Université de Lyon, ENTPE, UMR CNRS 5023, Laboratoire LEHNA, 2 rue Maurice Audin, 69518 Vaulx-en-Velin (France); Donguy, Gilles [Université de Lyon, ENTPE, UMR CNRS 5023, Laboratoire LEHNA, 2 rue Maurice Audin, 69518 Vaulx-en-Velin (France); Emmanuel, Evens [Laboratoire de Qualité de l' Eau et de l' Environnement, Université Quisqueya, BP 796 Port-au-Prince (Haiti); Winiarski, Thierry [Université de Lyon, ENTPE, UMR CNRS 5023, Laboratoire LEHNA, 2 rue Maurice Audin, 69518 Vaulx-en-Velin (France)

    2014-07-01

    Dredged seaport sediments raise complex management problems since it is no longer possible to discharge them into the sea. Traditional waste treatments are poorly adapted for these materials in terms of absorbable volumes and cost. In this context, filling quarries with treated sediments appears interesting but its safety regarding human health must be demonstrated. To achieve this, a specific methodology for assessing health risks has been developed and tested on three seaport sediments. This methodology includes the development of a conceptual model of the global scenario studied and the definition of specific protocols for each of its major steps. The approach proposed includes in particular the use of metrological and experimental tools that are new in this context: (i) an experimental lysimeter for characterizing the deposit emissions, and (ii) a geological radar for identifying potential preferential pathways between the sediment deposit and the groundwater. The application of this approach on the three sediments tested for the scenario studied showed the absence of health risk associated with the consumption of groundwater for substances having a “threshold effect” (risk quotient < 1), and an acceptable risk for substances having a “non-threshold effect”, with the notable exception of arsenic (individual risk equal to 3.10{sup −6}). - Highlights: • The release of polluted dredged seaport sediments into the sea must be avoided. • Their use after treatment for the filling-up of quarries is proposed by managers. • An original health risk assessment methodology was created to validate this option. • It includes the use of a lysimeter and a georadar for the exposure assessment stage. • The example studied concludes to a health risk linked to arsenic in the groundwater.

  18. Laparoscopic repair of postoperative perineal hernia.

    LENUS (Irish Health Repository)

    Ryan, Stephen

    2010-01-01

    Perineal hernias are infrequent complications following abdominoperineal operations. Various approaches have been described for repair of perineal hernias including open transabdominal, transperineal or combined abdominoperineal repairs. The use of laparoscopic transabdominal repair of perineal hernias is not well-described. We present a case report demonstrating the benefits of laparoscopic repair of perineal hernia following previous laparoscopic abdominoperineal resection (APR) using a nonabsorbable mesh to repair the defect. We have demonstrated that the use of laparoscopy with repair of the pelvic floor defect using a non absorbable synthetic mesh offers an excellent alternative with many potential advantages over open transabdominal and transperineal repairs.

  19. Hypospadias repair

    Science.gov (United States)

    ... the problem. If the repair is not done, problems may occur later on such as: Difficulty controlling and directing urine stream A curve in the penis during erection Decreased fertility Embarrassment about appearance of penis Surgery ...

  20. Effects of contaminants in dredge material from the Lower Savannah River

    Science.gov (United States)

    Winger, P.V.; Lasier, P.J.; White, D.H.; Seginak, J.T.

    2000-01-01

    Contaminants entering aquatic systems from agricultural, industrial, and municipal activities are generally sequestered in bottom sediments. The environmental significance of contaminants associated with sediments dredged from Savannah Harbor, Georgia, USA, are unknown. To evaluate potential effects of contaminants in river sediments and sediments dredged and stored in upland disposal areas on fish and wildlife species, solid-phase sediment and sediment pore water from Front River, Back River, an unnamed Tidal Creek on Back River, and Middle River of the distributary system of the lower Savannah River were tested for toxicity using the freshwater amphipod Hyalella azteca. In addition, bioaccumulation of metals from sediments collected from two dredge-disposal areas was determined using the freshwater oligochaete Lumbriculus variegatus. Livers from green-winged teals (Anas crecca) and lesser yellowlegs (Tringa flavipes) foraging in the dredge-spoil areas and raccoons (Procyon lotor) from the dredge-disposal/river area and an upland site were collected for metal analyses. Survival of H. azteca was not reduced in solid-phase sediment exposures, but was reduced in pore water from several locations receiving drainage from dredge-disposal areas. Basic water chemistry (ammonia, alkalinity, salinity) was responsible for the reduced survival at several sites, but PAHs, metals, and other unidentified factors were responsible at other sites. Metal residues in sediments from the Tidal Creek and Middle River reflected drainage or seepage from adjacent dredge-disposal areas, which could potentially reduce habitat quality in these areas. Trace metals increased in L. variegatus exposed in the laboratory to dredge-disposal sediments; As, Cu, Hg, Se, and Zn bioaccumulated to concentrations higher than those in the sediments. Certain metals (Cd, Hg, Mo, Se) were higher in livers of birds and raccoons than those in dredge-spoil sediments suggesting bioavailability. Cadmium, Ct, Hg, Pb

  1. Phytoremediation as a management option for contaminated sediments in tidal marshes, flood control areas and dredged sediment landfill sites.

    Science.gov (United States)

    Bert, Valérie; Seuntjens, Piet; Dejonghe, Winnie; Lacherez, Sophie; Thuy, Hoang Thi Thanh; Vandecasteele, Bart

    2009-11-01

    affected by polluted sediments, and the processes affecting pollutant bioavailability in the sediments. Studies that combine contaminated sediment and phytoremediation are relatively recent and are increasing in number since few years. Several papers suggest including phytoremediation in a management scheme for contaminated dredged sediments and state that phytoremediation can contribute to the revaluation of land-disposed contaminated sediments. The status of sediments, i.e. reduced or oxidised, highly influences contaminant mobility, its (eco)toxicity and the success of phytoremediation. Studies are performed either on near-fresh sediment or on sediment-derived soil. Field studies show temporal negative effects on plant growth due to oxidation and subsequent ageing of contaminated sediments disposed on land. The review shows that a large variety of plants and trees are able to colonise or develop on contaminated dredged sediment in particular conditions or events (e.g. high level of organic matter, clay and moisture content, flooding, seasonal hydrological variations). Depending on the studies, trees, high-biomass crop species and graminaceous species could be used to degrade organic pollutants, to extract or to stabilise inorganic pollutants. Water content of sediment is a limiting factor for mycorrhizal development. In sediment, specific bacteria may enhance the mobilisation of inorganic contaminants whereas others may participate in their immobilisation. Bacteria are also able to degrade organic pollutants. Their actions may be increased in the presence of plants. Choice of plants is particularly crucial for phytoremediation success on contaminated sediments. Extremely few studies are long-term field-based studies. Short-term effects and resilience of ecosystems is observed in long-term studies, i.e. due to degradation and stabilisation of pollutants. Terrestrial ecosystems affected by polluted sediments range from riverine tidal marshes with several interacting

  2. Study on Key Problems of a New Environmental Dredging Based on Ecological Protection and Subsequent Ecological Restoration

    Institute of Scientific and Technical Information of China (English)

    HU; Wei

    2012-01-01

    [Objective] The research aimed to study key problems of a new environmental dredging based on ecological protection and subsequent ecological restoration. [Method] People paid more attention to sediment pollutant removal in environmental dredging, without considering coming aquatic eco-restoration work after dredging. Factor affecting aquatic ecosystem existence and growth was screened, and ecological dredging manner was put forward. [Result] On the basis of analyzing dredging objective, effect and influence, started from ecological protection and subsequent ecological restoration, water depth and substrate were screened as priority control factors of the environmental sediment dredging. New manner of combining sediment dredging to reshape underwater terrain was put forward. [Conclusion] The research provided solution for water depth and substrate demands of the subsequent ecological restoration.

  3. Dredged material decontamination demonstration for the port of New York/New Jersey.

    Science.gov (United States)

    Jones, K W; Feng, H; Stern, E A; Lodge, J; Clesceri, N L

    2001-07-30

    Management of contaminated dredged material is a significant challenge in the Port of New York and New Jersey as a result of more stringent regional ocean placement regulations with escalating costs for upland placement. One component of an overall management plan can be the application of a decontamination technology followed by creation of a product suitable for beneficial use. This concept is the focus of a project now being carried out by the US Environmental Protection Agency, Region 2, the US Army Corps of Engineers, New York District, the US Department of Energy, Brookhaven National Laboratory, and regional university groups that have included Rensselaer Polytechnic Institute, Rutgers University, New Jersey Institute of Technology, and Stevens Institute of Technology. The project has progressed through phased testing of commercial technologies at the bench scale (15 liters) (Marcor, Metcalf & Eddy, Gas Technology Institute, Westinghouse Science & Technology, BioGenesis, International Technology, and BioSafe) and pilot-scale (1.5-500m(3)) (BioGenesis, Gas Technology Institute, and Westinghouse Science & Technology) levels. The technologies developed by Gas Technology Institute and BioGenesis are now going forward to commercial demonstration facilities that are intended to treat from 23000 to 60000m(3) of dredged material during their first operational period in 2001-2002. Beneficial use products are soils and cement. Treatment costs for the final commercial facilities are estimated at US$ 39 per m(3). Selection of the technologies was made based on the effectiveness of the treatment process, evaluation of the possible beneficial use of the treated materials, and other factors. Major elements of the project are summarized here.

  4. Regional variation in bycatches associated with king scallop (Pecten maximus L.) dredge fisheries.

    Science.gov (United States)

    Szostek, Claire L; Murray, Lee G; Bell, Ewen; Lambert, Gwladys; Kaiser, Michel J

    2017-02-01

    The biomass and composition of bycatch from king scallop dredge fisheries was assessed and compared between the English Channel, Cardigan Bay in Wales and around the Isle of Man. Bycatch composition varied significantly at localised, and broad, geographic scales. The mean proportion of scallop dredge bycatch biomass in the English Channel was 19% of total catch biomass. The proportion of bycatch was lower in Cardigan Bay (15%) but notably higher around the Isle of Man (53%). The proportion of individual bycatch species in dredge catches were low, therefore scallop dredging is unlikely to cause a substantial increase the population mortality of individual commercially fished species beyond that caused by the target fisheries for those species, or bycatches of other fisheries. The amount and mortality of organisms left on the seabed in the dredge path was not quantified in this study but should also be considered in management of the fishery. The discard rate of finfish and shellfish of commercial value from the king scallop dredge fishery in the English Channel was between 18 and 100%, with a higher rate of discarding occurring in the eastern English Channel compared to the west. The clear regional differences in bycatch composition and variation in the quantity of discards mean that an area by area approach to managing bycatch species is required in relation to the king scallop dredge fishery.

  5. Early recolonization of a dredged lowland river by dragonflies (Insecta: Odonata

    Directory of Open Access Journals (Sweden)

    Buczyński Paweł

    2016-01-01

    Full Text Available The influence of dredging on the dragonfly assemblages of the small regulated lowland River Krąpiel (north-western Poland was analyzed a short time after the dredging. Dragonfly assemblages were destroyed, but they began to recover rapidly. Many biocoenotic indices reached high values at just six months after the dredging. The recolonization first occurred as a result of larval drift, and then, via dispersion of adult dragonflies. This process took place in conditions different from the prevailing conditions in the period before dredging, in terms of microhabitat availability and physico-chemical conditions. Compared to the previous assemblage, the emerging assemblage was more typical of assemblages found in small, natural running waters. Therefore, dredging (carried out for economic reasons could be regarded as a process that unintentionally had a positive influence on odonate assemblages. Currently, when most small watercourses are regulated, dredging that is properly planned and controlled has proven to protect the natural fauna. It is worthwhile to apply lessons learned from examples of active fauna protection to what is currently known as “the rotational model” for dredging.

  6. International congress on DNA damage and repair: Book of abstracts

    Energy Technology Data Exchange (ETDEWEB)

    1987-01-01

    This document contains the abstracts of 105 papers presented at the Congress. Topics covered include the Escherichia coli nucleotide excision repair system, DNA repair in malignant transformations, defective DNA repair, and gene regulation. (TEM)

  7. Dredged Rock Samples from the Alpha Ridge, Arctic Ocean: Implications for the Tectonic History and Origin of the Amerasian Basin

    Science.gov (United States)

    Brumley, K.; Mayer, L.; Miller, E. L.; Coakley, B.

    2008-12-01

    The Amerasian Basin of the Arctic Ocean conceals one of the few unresolved plate tectonic puzzles on Earth, with important implications for the geologic history of the vast adjoining shelfal regions. Until we are able to scientifically drill the most controversial parts of the Amerasian Basin seafloor, many questions about its age and origin will remain unanswered. To address the plate tectonic origin of the Amerasian Basin, we dredged steep escarpments along the Alpha Ridge, a bathymetric ridge that extends across the Amerasian Basin. The Alpha Ridge is dissected by structures that have been characterized by seismic reflection and which appear to be normal fault-bound linear ridges and basins. The Alpha Ridge has been described as a hot spot track, an oceanic plateau, and a possible spreading center. Dredged samples taken in 1985 from the central Alpha Ridge were determined to be highly altered fragmental basalt and yielded a Late Cretaceous 40Ar/39Ar whole rock age which agreed with the conventional models for a purely volcanic/oceanic origin of the Alpha Ridge (Forsythe and others, 1986; Lawver et al., 2002). Dredged rock samples were taken by the icebreaker USCGC Healy (HLY0805, Mayer and Armstrong, 2008) and included samples from a steep slope of a subsidiary ridge in the south central Alpha/Mendeleev Ridge complex. The fresh broken surfaces of large blocks of rock and the lithologic similarity of the rocks recovered suggest an outcrop was sampled. The recovered rocks included interbedded red sandstones and ochre mudstones with well-defined bedding and sedimentary structures. Preliminary shipboard analysis suggests they may be tuffaceous and/or derived from volcanic sources, and may possibly be continental in origin. Further analysis and descriptions will be carried out in the coming months to determine their age and depositional environment. The results of this analysis and their possible implications for the origin of the Alpha Ridge and tectonic history of

  8. Measuring the effects of cutter suction dredge operating parameters on minor losses due to fixed screens installed at the suction inlet

    OpenAIRE

    Lewis, Joshua Mark

    2014-01-01

    CIVINS One of the most efficient and versatile types of modern dredges is the cutter suction dredge. Specific regulations mandate the placement of screens over the suction mouth during dredging operations to prevent ordnance, wildlife, and other debris from entering the system; however, these screens change the operational capability of the dredge in the form of an additional minor loss. The goal of this experiment was to determine the effects of different dredge operating p...

  9. Femoral hernia repair

    Science.gov (United States)

    Femorocele repair; Herniorrhaphy; Hernioplasty - femoral ... During surgery to repair the hernia, the bulging tissue is pushed back in. The weakened area is sewn closed or strengthened. This repair ...

  10. Undescended testicle repair

    Science.gov (United States)

    Orchidopexy; Inguinal orchidopexy; Orchiopexy; Repair of undescended testicle; Cryptorchidism repair ... first year of life without treatment. Undescended testicle repair surgery is recommended for patients whose testicles do ...

  11. Preliminary Assessment of Potential Impacts to Dungeness Crabs from Disposal of Dredged Materials from the Columbia River

    Energy Technology Data Exchange (ETDEWEB)

    Pearson, Walter H.; Miller, Martin C.; Williams, Greg D.; Kohn, Nancy P.; Skalski, John R.

    2006-02-01

    Dredging of the Columbia River navigation channel has raised concerns about dredging-related impacts on Dungeness crabs (Cancer magister). The overall objectives of this effort are to synthesize what is known about disposal effects on Dungeness crabs (Phase 1) and to offer approaches to quantify the effects, including approaches to gain a population-level perspective on any effects found in subsequent studies (Phase 2). This report documents Phase 1, which included (1) development of a conceptual model to integrate knowledge about crab biology and the physical processes occurring during disposal, (2) application of physics-based numerical modeling of the disposal event to understand the physical forces and processes to which a crab might be exposed during disposal, (3) conduct of a vulnerability analysis to identify the potential mechanisms by which crabs may be injured, and (4) recommendations of topics and approaches for future studies to assess the potential population-level effects of disposal on Dungeness crabs. The conceptual model first recognizes that disposal of dredged materials is a physically dynamic process with three aspects: (1) convective descent and bottom encounter, (2) dynamic collapse and spreading, and (3) mounding. Numerical modeling was used to assess the magnitude of the potentially relevant forces and extent of mounding in single disposal events. The modeling outcomes show that predicted impact pressure, shear stress, and mound depth are greatly reduced by discharge in deep water, and somewhat reduced at longer discharge duration. The analysis of numerical modeling results and vulnerabilities indicate that the vulnerability of crabs to compression forces under any of the disposal scenarios is low. For the deep-water disposal scenarios, the maximum forces and mounding do not appear to be sufficiently high enough to warrant concern for surge currents or burial at the depths involved (over 230 ft). For the shallow-water (45 to 65 ft), short

  12. An experimental study on dredge spoil of estuarine sediments in the bay of seine (France): A morphosedimentary assessment

    Science.gov (United States)

    Marmin, Stella; Lesueur, Patrick; Dauvin, Jean Claude; Samson, Sandrine; Tournier, Patrice; Gallicher Lavanne, Albert; Dubrulle-Brunaud, Carole; Thouroude, Coralie

    2016-03-01

    Studies on the consequences of dredging on estuarine morphology and its sedimentary dynamics are common, but the impacts of dumping dredge spoil in coastal open settings are rarely found in scientific literature. An experimental study was conducted over the period 2012-2013 to monitor the physical impacts of dredged material dumped at two adjacent sites (one million cubic metres at each) on the inner shelf of the Bay of Seine in France (eastern part of the English Channel, La Manche). As recently reinforced in the EU Marine Strategy Framework Directive (MSFD), knowledge on the location and intensity of human impacts (e.g. on marine ecosystems) is critical for effective marine management and conservation. So, two methods of disposition were tested to evaluate the impacts of dumping on the environment and thus propose recommendations for future dumping. The strategy is based on a Before-After-Control-Impact (BACI) approach, in which the spatio-temporal variability was studied by analysing the morphological and sedimentological characteristics over a period of 28 months, from November 2011 to April 2014, also including recovery of the seafloor after cessation of the dumping activities. The first experimental dumping operation (MASED) was carried out regularly for 8 months at a single point and generating a conical deposit of 5 m in height, while the second dumping (MABIO) lasted for 12 months involving four steps in the dumping process. In the second case, a wider area was covered, leading to the formation of a smaller deposit of 2 m in height. The dumped deposits consisted of muddy fine sand, whereas the inner shelf seafloor in this area is covered with fine to medium sand. As a result, muddy fine sand accumulated at or near the two dumping sites, with a maximum mud (i.e. particles4 Φ) content of 50% compared toareas. Due to hydrodynamic forcing (wave climate and tidal currents), about 50% (MABIO) and 75% (MASED) of the volume of dredged material remained at the end

  13. Contaminants investigation of Aransas Dredge Spoil Islands Texas, 1988-1989

    Data.gov (United States)

    US Fish and Wildlife Service, Department of the Interior — Organochlorine, trace element, and petroleum hydrocarbon contaminants were examined in sediments and biota from dredge spoil islands adjacent to Aransas National...

  14. Southern Monterey Bay Littoral Cell CRSMP CEMEX Mine Dredge Pond 2008

    Data.gov (United States)

    California Department of Resources — Location of the CEMEX mine dredge pond at Lapis Sand Plant, Marina, CA. Southern Monterey Bay has been the most intensively mined shoreline in the U.S. Sand mining...

  15. 78 FR 37759 - Ocean Dumping; Atchafalaya-West Ocean Dredged Material Disposal Site Designation

    Science.gov (United States)

    2013-06-24

    ... From the Federal Register Online via the Government Publishing Office ENVIRONMENTAL PROTECTION AGENCY 40 CFR Part 228 Ocean Dumping; Atchafalaya-West Ocean Dredged Material Disposal Site Designation AGENCY: Environmental Protection Agency (EPA). ACTION: Proposed rule and draft Environmental...

  16. Evaluation of dredged material proposed for ocean disposal from Shark River Project area

    Energy Technology Data Exchange (ETDEWEB)

    Antrim, L.D.; Gardiner, W.W.; Barrows, E.S.; Borde, A.B. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1996-09-01

    The objective of the Shark River Project was to evaluate proposed dredged material to determine its suitability for unconfined ocean disposal at the Mud Dump Site. Tests and analyses were conducted on the Shark River sediments. The evaluation of proposed dredged material consisted of bulk sediment chemical and physical analysis, chemical analyses of dredging site water and elutriate, water-column and benthic acute toxicity tests, and bioaccumulation tests. Individual sediment core samples collected from the Shark River were analyzed for grain size, moisture content, and total organic carbon (TOC). One sediment composite was analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAHs), and 1,4- dichlorobenzene. Dredging site water and elutriate, prepared from suspended-particulate phase (SPP) of the Shark River sediment composite, were analyzed for metals, pesticides, and PCBs. Benthic acute toxicity tests and bioaccumulation tests were performed.

  17. Beneficial Uses of Dredged Material Case Study: San Francisco Bay Region

    Science.gov (United States)

    A major interagency, regional planning effort led to the development of the Long-Term Management Strategy and other planning programs in the San Francisco Bay area. These programs incorporate beneficial uses of dredged material into local projects.

  18. Southern Monterey Bay Littoral Cell CRSMP CEMEX Mine Dredge Pond 2008

    Data.gov (United States)

    California Department of Resources — Location of the CEMEX mine dredge pond at Lapis Sand Plant, Marina, CA. Southern Monterey Bay has been the most intensively mined shoreline in the U.S. Sand mining...

  19. Intestinal obstruction repair

    Science.gov (United States)

    Repair of volvulus; Intestinal volvulus - repair; Bowel obstruction - repair ... Intestinal obstruction repair is done while you are under general anesthesia . This means you are asleep and DO NOT feel pain. ...

  20. Aortic aneurysm repair - endovascular

    Science.gov (United States)

    EVAR; Endovascular aneurysm repair - aorta; AAA repair - endovascular; Repair - aortic aneurysm - endovascular ... Endovascular aortic repair is done because your aneurysm is very large, growing quickly, or is leaking or bleeding. You may have ...

  1. Environmental effects of dredging: Alternative dredging equipment and operational methods to minimize sea turtle mortalities. Technical notes

    Energy Technology Data Exchange (ETDEWEB)

    Dickerson, D.D.; Nelson, D.A.

    1990-12-01

    Five species of sea turtles occur along the United States coastlines and are listed as threatened or endangered. The loggerhead sea turtle (Caretta caretta) is listed as threatened, while the Kemp`s ridley (Lepidochelys kenipi), the hawksbill (Eretmochelys imbricata), and the leatherback (Dermochelys coriacea) are all less abundant and listed as endangered. Florida breeding populations of the green sea turtle (Chelonia mydas) are listed as endangered, but green turtles in other US waters are considered threatened. The National Marine Fisheries Service (NMFS) has determined, based on the best available information, that because of their life cycle and behavioral patterns only the loggerhead, the green, and the Kemp`s ridley are put at risk by hopper dredging activities (Studt 1987).

  2. Motorcycle Repair.

    Science.gov (United States)

    Hein, Jim; Bundy, Mike

    This motorcycle repair curriculum guide contains the following ten areas of study: brake systems, clutches, constant mesh transmissions, final drives, suspension, mechanical starting mechanisms, electrical systems, fuel systems, lubrication systems, and overhead camshafts. Each area consists of one or more units of instruction. Each instructional…

  3. Sediment Management Methods to Reduce Dredging: Part 2, Sediment Collector Technology

    Science.gov (United States)

    2017-04-01

    ensure that unauthorized personnel do not gain access to the material management equipment (separator and stacker). The 6 ft tall fence around the...Approved for public release; distribution is unlimited. ERDC TN-DOER-T13 April 2017 Sediment Management Methods to Reduce Dredging: Part 2...DOER) Program technical note (TN) is the second in a series evaluating sediment management methods to reduce dredging through a research task (RT

  4. Managing dredged material in the coastal zone of the Baltic Sea.

    Science.gov (United States)

    Staniszewska, Marta; Boniecka, Helena

    2017-01-01

    This article deals with the legal and practical recommendations for the management of dredged material in the riparian countries of the Baltic Sea. The recommendations are contained in three conventions: LC, 2000. London Convention (1972), Convention on the Protection of the Marine Environment of the Baltic Sea area (Helsinki Convention) (1992), the OSPAR Convention (1972). Different approaches to evaluating the contamination level of dredge spoils, used by the Baltic Sea riparian countries, have been characterized. The differences in those approaches manifest themselves by various concentration limits for contaminants, which form a basis for the classification of dredged material as either contaminated or non-contaminated, and thus determine how the spoils will be processed further. Based on the collected information about the concentration limits for contaminants of surface sediments in the coastal ports, it was pointed out that it is necessary to conduct routine monitoring of heavy metals, polycyclic aromatic hydrocarbons, polychlorinated biphenyls, tributyltin, and petroleum hydrocarbons in dredged sediments in all the Baltic Sea states. On the other hand, the monitoring of polychlorinated dibenzo-p-dioxins/furans, organochlorine, and organophosphoric pesticides is only needed in locations that are suspected of historical or being the local contamination sources. Due to significant economic limitations of chemical determinations, it is important to consider a simple screening test of sediment that would say whether sediment may be "contaminated" and qualifies for more detailed and costly chemical research. It may be typical basic physical-chemical analysis of sediments or ecotoxicological classification of sediments.Despite environmentally friendly tendencies, the practical application of dredged material within the Baltic Sea area is very limited. Dredged material is most frequently stored at the specifically designated sites. From among the practical uses of

  5. Introduction to Using Native Plant Community on Dredge Material Placement Areas

    Science.gov (United States)

    2017-05-01

    is placed to stabilize the dikes so that the root systems do not penetrate these barriers and provide for a pathway for release of contaminated ...exposure to erosive wave action • grain size, organic content and contaminant level of sediments placed in the facility • water content of soil/sediment...placements. The characteristics of CDF vary according to the volume, frequency, and contaminant level of the material being dredged, the method of dredging

  6. Application of Toxicity Identification and Evaluation Procedures for Dredged Material Management

    Science.gov (United States)

    2017-02-01

    material in confined disposal facilities (CDF) increase, the development of sustainable alternatives for dredged material management are being pursued...The effects-based testing relies on standard toxicity tests using freshwater and marine organisms for assessing the potential toxicity of dredged...tests, resulted in the U.S. Environmental Protection Agency (EPA) developing a new class of testing protocols referred to as Toxicity Identification

  7. Ecological evaluation of proposed dredged material from the Point Frazer Bend Reach, Winyah Bay, South Carolina

    Energy Technology Data Exchange (ETDEWEB)

    Gardiner, W.W.; Ward, J.A.; Word, J.Q.

    1995-02-01

    The port of Georgetown, South Carolina, is served by navigational channels within Winyah Bay and the lower Sampit River. Dredging is required to maintain these waterways and to facilitate normal shipping traffic. Prior to dredging, ecological evaluations must be conducted to determine the suitability of the proposed dredged material for open-ocean disposal. These evaluations are to be performed under Section 103 of the Marine Protection, Research, and, Sanctuaries Act of 1972 (MPRSA), following the testing protocols presented in Evaluation of Dredged Material Proposed for Ocean Disposal Testing Manual, hereafter referred to as the 1991 Implementation Manual. The Charleston Intensive Project is a reevaluation of sediments collected from two stations (IH-2 and IH-3) in the Frazier Point Bend reach of the Winyah Bay channel. Reference sediment was also collected from site IH-R2, just south of Hare Island. The results of physical/chemical analyses indicated that some contaminants of concern were present in test treatments representing dredged material when compared with the reference treatment IH-R2. The results of this study indicate that, based on the acute toxicity and chemical analyses, dredged material represented by these test treatments is suitable for open-ocean disposal.

  8. Dredged sediments as a resource for brick production: possibilities and barriers from a consumers' perspective.

    Science.gov (United States)

    Cappuyns, Valérie; Deweirt, Valentine; Rousseau, Sandra

    2015-04-01

    A possible solution for the oversupply of dredged sediments is their use as a raw material in brick production. Despite the fact that several examples (e.g., Agostini et al., 2007; Hamer and Karius, 2002; Xu et al., 2014) show that this application is feasible, some economic, technical and social limitations interfere with the development of a market of dredged materials in brick production in Flanders. While we describe the main characteristics of the supply side, we focus on the limitations and barriers from the demand side in the present study. Based on a consumers survey we analyze consumers' risk perceptions and attitudes towards bricks produced from dredged sediments. Consumers in Flanders are rather suspicious with respect to bricks produced from dredged sediments and their risk perception is mainly determined by the possibility of a bad bargain (brick of inferior quality) and the connotation with chemical contamination. The willingness to pay for bricks made from dredged sediments is mainly influenced by the age of the respondents, as well environmental awareness, and the respondents' belief in their ability to influence environmental problems. Sensitization and information of customers seems to be of primary importance to make dredged-sediment-derived bricks a successful product.

  9. Some Insights to the Reuse of Dredged Marine Soils by Admixing with Activated Steel Slag

    Directory of Open Access Journals (Sweden)

    Chee-Ming Chan

    2014-01-01

    Full Text Available Regular dredging is necessary for the development of coastal regions and the maintenance of shipping channels. The dredging process dislodges sediments from the seabed, and the removed materials, termed dredged marine soils, are generally considered a geowaste for dumping. However, disposal of the dredged soils offshores can lead to severe and irreversible impact on the marine ecosystem, while disposal on land often incurs exorbitant costs with no guarantee of zero-contamination. It is therefore desirable to reuse the material, and one option is solidification with another industrial waste, that is, steel slag. This paper describes the exploratory work of admixing dredged marine soil with activated steel slag for improvement of the mechanical properties. An optimum activation concentration of NaOH was introduced to the soil-slag mixture for uniform blending. Specimens were prepared at different mix ratios then left to cure for up to 4 weeks. The unconfined compressive strength test was conducted to monitor the changes in strength at predetermined intervals. It was found that the strength does not necessarily increase with higher steel slag content, indicating an optimum slag content required for the maximum solidification effect to take place. Also, regardless of the slag content, longer curing time produces greater strength gain. In conclusion, steel slag addition to dredged sediments can effectively strengthen the originally weak soil structure by both the “cementation” and “filler” effects, though the combined effects were not distinguished in the present study.

  10. Evaluation of dredged material proposed for ocean disposal from Westchester Creek project area, New York

    Energy Technology Data Exchange (ETDEWEB)

    Pinza, M.R.; Gardiner, W.W.; Barrows, E.S.; Borde, A.B.

    1996-11-01

    The objective of the Westchester Creek project was to evaluate proposed dredged material from this area to determine its suitability for unconfined ocean disposal at the Mud Dump Site. Westchester Creek was one of five waterways that the US Army Corps of Engineers- New York District (USACE-NYD) requested the Battelle/Marine Sciences Laboratory (MSL) to sample and evaluate for dredging and disposal in May 1995. The evaluation of proposed dredged material from the Westchester Creek project area consisted of bulk sediment chemical analyses, chemical analyses of dredging site water and elutriate, benthic acute and water-column toxicity tests, and bioaccumulation studies. Thirteen individual sediment core samples were collected from this area and analyzed for grain size, moisture content, and total organic carbon (TOC). One composite sediment sample representing the Westchester Creek area to be dredged, was analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAHs), and 1,4-dichlorobenzene. Dredging site water and elutriate water, which is prepared from the suspended- particulate phase (SPP) of the Westchester Creek sediment composite, was analyzed for metals, pesticides, and PCBS.

  11. Characterization of Dredged Oyster Shell Deposits at Mobile Bay, Alabama Using Geophysical Methods

    Directory of Open Access Journals (Sweden)

    Stanley C. Nwokebuihe

    2016-12-01

    Full Text Available The need for disposing materials dredged from ship channels is a common problem in bays and lagoons. This study is aimed at investigating the suitability of scour features produced by dredging oyster shell deposits in Mobile Bay, Alabama, to dispose excavated channel material. A study area approximately 740 by 280 m lying about 5 km east of Gaillard Island was surveyed using underwater electrical resistivity tomography (UWERT and continuous electrical resistivity profiling (CERP tools. The geophysical survey was conducted with the intent to map scour features created by oyster shell dredging activities in the bay between 1947 and 1982. The geoelectrical surveys show that oyster beds are characterized by high resistivity values greater than 1.1 ohm.m while infilled dredge cuts show lower resistivity, generally from 0.6 to 1.1 ohm.m. The difference in resistivity mainly reflects the lithology and the consolidation of the shallow sediments: consolidated silty clay and sandy sediments rich in oyster shell deposits (with less clay content overlying unconsolidated clayey materials infilling the scours. Results show that most of the infilled dredge cuts are mostly distributed in the north-south direction. Considering that the scours are generally up to 6 m deep across the survey location, it is estimated that about 0.8 million cubic meters of oyster shells and overlying strata were dredged from the survey location.

  12. Evaluation of Dredged Material Proposed for Ocean Disposal from Federal Projects in New York and New Jersey and the Military Ocean Terminal (MOTBY)

    Energy Technology Data Exchange (ETDEWEB)

    Barrows, E.S.; Antrim, L.D.; Pinza, M.R.; Gardiner, W.W.; Kohn, N.P.; Gruendell, B.D.; Mayhew, H.L.; Word, J.Q.; Rosman, L.B. [Battelle Marine Sciences Laboratory, Sequim, Washington (United States)

    1996-08-01

    The U.S. Army Corps of Engineers (USACE) is authorized by Section 103 of the Marine Protection, Research, and Sanctuaries Act of 1972 (MPRSA), Public Law 92-532, and by the Clean Water Act of 1972 (CWA) and Amendments of 1977 to permit, evaluate, and regulate the disposal of dredged material in ocean waters to minimize adverse environmental effects. Compliance with the regulations of the MPRSA calls for physical and biological testing of sediment proposed for dredging prior to its disposal in ocean waters. The testing required by the MPRSA criteria is conducted under a testing manual developed by the USACE and the U.S. Environmental Protection Agency (EPA), Evaluation of Dredged Material Proposed for Ocean Disposal (Testing Manual), commonly referred to as the `Green Book.` Testing protocols in the Green Book include bulk sediment analysis, grain size analysis, elutriate testing, and biological testing. The biological testing includes bioassays for acute toxicity as well as analysis to determine bioaccumulation of certain contaminants by marine organisms. The objective of the USACE-NYD Federal Projects Program was to evaluate sediment proposed for dredging and unconfined ocean disposal at the Mud Dump Site. The results of analytical measurements and bioassays performed on the test sediments were compared with analyses of sediment from the Mud Dump Reference Site to determine whether the test sediments were acutely toxic to marine organisms or resulted in statistically significantly greater bioaccumulation of contaminants in marine organisms, relative to the reference sediment. Testing for the federal project areas was performed according to the requirements.

  13. Assessing the recovery of functional diversity after sustained sediment screening at an aggregate dredging site in the North Sea

    Science.gov (United States)

    Barrio Froján, Christopher R. S.; Cooper, Keith M.; Bremner, Julie; Defew, Emma C.; Wan Hussin, Wan M. R.; Paterson, David M.

    2011-05-01

    The effects of dredging the seabed for aggregate on benthic functional diversity were assessed using a suite of suitable indices on a recovering macrofaunal assemblage. Recovery was assessed as the return of a dredged assemblage to a state found in neighbouring undisturbed (reference) sites. In situ sediment screening was permitted during dredging operations; a difference in the sedimentary profile of the seabed between dredged and undisturbed reference sites was also observed. At sites of relatively high and low dredging intensity the sediment appeared more homogenous than reference sites after the selective removal of the coarser component. Initial assessment of the macrofaunal assemblage using univariate analytical techniques suggested a recovery of functional diversity at the low dredging intensity site after two years (according to the Infaunal Trophic Index, Taxonomic Distinctness index and Rao's Quadratic Entropy coefficient). However, multivariate analyses of the same data and of all indices except Taxonomic Distinctness indicated that assemblages at both high and low dredging intensity sites remained statistically indistinguishable from each other yet markedly different to the assemblage present in the reference area during the four-year study. The study concluded that recovery of functional diversity to a level found in a neighbouring undredged habitat had not occurred at either dredged site five years after the cessation of dredging. It is thought that the damage by dredging to functional diversity and to the capacity of the macrofaunal assemblage to recover is immediate and not so dependent on dredging intensity. The cumulative and wider ranging effects of sediment screening cannot be ignored or dismissed as a contributing factor to the similarities observed. The wider significance of these findings on the regulation of dredging activities is discussed.

  14. Detecting sedimentation impacts to coral reefs resulting from dredging the Port of Miami, Florida USA

    Directory of Open Access Journals (Sweden)

    Margaret W. Miller

    2016-11-01

    Full Text Available The federal channel at Port of Miami, Florida, USA, was dredged between late 2013 and early 2015 to widen and deepen the channel. Due to the limited spatial extent of impact-assessment monitoring associated with the project, the extent of the dredging impacts on surrounding coral reefs has not been well quantified. Previously published remote sensing analyses, as well as agency and anecdotal reports suggest the most severe and largest area of sedimentation occurred on a coral reef feature referred to as the Inner Reef, particularly in the sector north of the channel. A confounding regional warm-water mass bleaching event followed by a coral disease outbreak during this same time frame made the assessment of dredging-related impacts to coral reefs adjacent to the federal channel difficult but still feasible. The current study sought to better understand the sedimentation impacts that occurred in the coral reef environment surrounding Port of Miami, to distinguish those impacts from other regional events or disturbances, and provide supplemental information on impact assessment that will inform discussions on compensatory mitigation requirements. To this end, in-water field assessments conducted after the completion of dredging and a time series analysis of tagged corals photographed pre-, during, and post-dredging, are used to discern dredging-related sedimentation impacts for the Inner Reef north. Results indicate increased sediment accumulation, severe in certain times and places, and an associated biological response (e.g., higher prevalence of partial mortality of corals extended up to 700 m from the channel, whereas project-associated monitoring was limited to 50 m from the channel. These results can contribute to more realistic prediction of areas of indirect effect from dredging projects needed to accurately evaluate proposed projects and design appropriate compliance monitoring. Dredging projects near valuable and sensitive habitats

  15. Ecological evaluation of proposed discharge of dredged material from Oakland Harbor into ocean waters (Phase 3 B of -42-foot project). Volume 1, Analyses and discussion

    Energy Technology Data Exchange (ETDEWEB)

    Kohn, N.P.; Ward, J.A.; Mayhew, H.L.; Word, J.Q.; Barrows, E.S.; Goodwin, S.M.; Lefkovitz, L.F. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1992-06-01

    The Water Resources Development Act of 1986 (Public Law 99-662) authorized the US Army Corps of Engineers (USACE) San Francisco District, to deepen and widen the navigational channels of the Oakland Inner and Outer Harbors to accomodate deeper-draft vessels. The USACE is considering several disposal options for the dredged material removed during these channel improvements including open-water disposal. Dredged material proposed for open-water disposal must be evaluated to determine the potential impacts of the disposal activity on the water column and disposal site enviromments. The USACE requested that Battelle/Marine Sciences Laboratory (MSL) conduct studies to evaluate open-water disposal options for Oakland Harbor sediments. This request developed into the Oakland Harbor Phase III Program. This is Volume 1 of a two-volume report that presents information gathered to determine the suitability of ocean disposal of sediments dredged from Oakland Harbor. This volume contains project background, materials and methods, results, discussion, and conclusions.

  16. Ecological evaluation of proposed discharge of dredged material from Oakland Harbor into ocean waters (Phase 3 B of -42-foot project)

    Energy Technology Data Exchange (ETDEWEB)

    Kohn, N.P.; Ward, J.A.; Mayhew, H.L.; Word, J.Q.; Barrows, E.S.; Goodwin, S.M.; Lefkovitz, L.F. (Battelle/Marine Sciences Lab., Sequim, WA (United States))

    1992-06-01

    The Water Resources Development Act of 1986 (Public Law 99-662) authorized the US Army Corps of Engineers (USACE) San Francisco District, to deepen and widen the navigational channels of the Oakland Inner and Outer Harbors to accomodate deeper-draft vessels. The USACE is considering several disposal options for the dredged material removed during these channel improvements including open-water disposal. Dredged material proposed for open-water disposal must be evaluated to determine the potential impacts of the disposal activity on the water column and disposal site enviromments. The USACE requested that Battelle/Marine Sciences Laboratory (MSL) conduct studies to evaluate open-water disposal options for Oakland Harbor sediments. This request developed into the Oakland Harbor Phase III Program. This is Volume 1 of a two-volume report that presents information gathered to determine the suitability of ocean disposal of sediments dredged from Oakland Harbor. This volume contains project background, materials and methods, results, discussion, and conclusions.

  17. Three-year summary report of biological monitoring at the Southwest Ocean dredged-material disposal site and additional locations off Grays Harbor, Washington, 1990--1992

    Energy Technology Data Exchange (ETDEWEB)

    Antrim, L.D.; Shreffler, D.K.; Pearson, W.H.; Cullinan, V.I. [Battelle Marine Research Lab., Sequim, WA (United States)

    1992-12-01

    The Grays Harbor Navigation Improvement Project was initiated to improve navigation by widening and deepening the federal channel at Grays Harbor. Dredged-material disposal sites were selected after an extensive review process that included inter-agency agreements, biological surveys, other laboratory and field studies, and preparation of environmental impact statements The Southwest Site, was designated to receive materials dredged during annual maintenance dredging as well as the initial construction phase of the project. The Southwest Site was located, and the disposal operations designed, primarily to avoid impacts to Dungeness crab. The Final Environmental Impact Statement Supplement for the project incorporated a Site Monitoring Plan in which a tiered approach to disposal site monitoring was recommended. Under Tier I of the Site Monitoring Plan, Dungeness crab densities are monitored to confirm that large aggregations of newly settled Dungeness crab have not moved onto the Southwest Site. Tier 2 entails an increased sampling effort to determine whether a change in disposal operations is needed. Four epibenthic surveys using beam trawls were conducted in 1990, 1991, and 1992 at the Southwest Site and North Reference area, where high crab concentrations were found in the spring of 1985. Survey results during these three years prompted no Tier 2 activities. Epibenthic surveys were also conducted at two nearshore sites where construction of sediment berms has been proposed. This work is summarized in an appendix to this report.

  18. MAINTAINING ACCESS TO AMERICA'S INTERMODAL PORTS/TECHNOLOGIES FOR DECONTAMINATION OF DREDGED SEDIMENT: NEW YORK/NEW JERSEY HARBOR.

    Energy Technology Data Exchange (ETDEWEB)

    STERN,E.A.; JONES,K.; DONATO,K.; PAULING,J.D.; SONTAG,J.G.; CLESCERI,N.L.; MENSINGER,M.C.; WILDE,C.L.

    1998-05-01

    One of the greatest drivers for maintaining access to America's Intermodal ports and related infrastructure redevelopment efforts over the next several years will be the control and treatment of contaminated sediments dredged from our nation's waterways. More than 306 million cubic meters (m{sup 3}) (400 million cubic yards [cy]) of sediments are dredged annually from U.S. waterways, and each year close to 46 million m{sup 3} (60 million cy) of this material is disposed of in the ocean (EPA 842-F-96-003). The need to protect our environment against undesirable effects from sediment dredging and disposal practices is gaining increased attention from the public and governmental agencies. Meeting this need is a challenging task not only from the standpoint of solving formidable scientific and engineering problems, but also, and more importantly, from the need to implement complex collaborations among the many different parties concerned with the problem. Some 40 years ago, C.P. Snow pointed out the problems involved in communicating between the two cultures of the sciences and the humanities (Snow, 1993). Today, it is necessary to extend Snow's concept to a multicultural realm with groups that include governmental, industrial, environmental, academic, and the general public communicating in different languages based on widely different fundamental assumptions.

  19. Environmental effects of dredging. Preliminary guidelines and conceptual framework for comprehensive analysis of migration pathways (CAMP) of contaminated dredged material. Technical notes

    Energy Technology Data Exchange (ETDEWEB)

    Myers, T.E.

    1990-01-01

    The purpose of this note is to present the conceptual groundwork for the Comprehensive Analysis of Migration Pathways (CAMP). The conceptualization process for CAMP is discussed and available techniques for implementing CAMP are examined. Disposal of contaminated dredged material in a confined disposal facility is used to benchmark conceptual development. Case studies that illustrate analysis of selected migration pathways are also described.

  20. Gender difference in walleye PCB concentrations persists following remedial dredging

    Science.gov (United States)

    Madenjian, Charles P.; Jude, David J.; Rediske, Richard R.; O'Keefe, James P.; Noguchi, George E.

    2009-01-01

    Eleven male walleyes (Sander vitreus) and 10 female walleyes from the Saginaw Bay (Lake Huron) population were caught during the spawning run at Dow Dam (Midland, Michigan) in the Tittabawassee River during April 1996, and individual whole-fish polychlorinated biphenyl (PCB) determinations were made. Total PCB concentrations averaged 7.95 and 3.17??mg/kg for males and females, respectively. As part of the Natural Resource Damage Assessment remediation process, contaminated sediments from the Saginaw River, the main tributary to Saginaw Bay, were removed during 2000 and 2001. Total PCB concentrations of 10 male and 10 female walleyes caught at Dow Dam during April 2007 averaged 1.58 and 0.55??mg/kg, respectively. Thus, dredging of the Saginaw River appeared to be effective in reducing PCB concentrations of Saginaw Bay adult walleyes, as both males and females decreased in PCB concentration by more than 80% between 1996 and 2007. However, the ratio of male PCB concentration to female PCB concentration did not decline between 1996 and 2007. This persistent gender difference in PCB concentrations was apparently due to a gender difference in habitat utilization coupled with a persistent spatial gradient in prey fish PCB concentrations from the Saginaw River to Lake Huron.

  1. DNA repair in Chromobacterium violaceum.

    Science.gov (United States)

    Duarte, Fábio Teixeira; Carvalho, Fabíola Marques de; Bezerra e Silva, Uaska; Scortecci, Kátia Castanho; Blaha, Carlos Alfredo Galindo; Agnez-Lima, Lucymara Fassarella; Batistuzzo de Medeiros, Silvia Regina

    2004-03-31

    Chromobacterium violaceum is a Gram-negative beta-proteobacterium that inhabits a variety of ecosystems in tropical and subtropical regions, including the water and banks of the Negro River in the Brazilian Amazon. This bacterium has been the subject of extensive study over the last three decades, due to its biotechnological properties, including the characteristic violacein pigment, which has antimicrobial and anti-tumoral activities. C. violaceum promotes the solubilization of gold in a mercury-free process, and has been used in the synthesis of homopolyesters suitable for the production of biodegradable polymers. The complete genome sequence of this organism has been completed by the Brazilian National Genome Project Consortium. The aim of our group was to study the DNA repair genes in this organism, due to their importance in the maintenance of genomic integrity. We identified DNA repair genes involved in different pathways in C. violaceum through a similarity search against known sequences deposited in databases. The phylogenetic analyses were done using programs of the PHILYP package. This analysis revealed various metabolic pathways, including photoreactivation, base excision repair, nucleotide excision repair, mismatch repair, recombinational repair, and the SOS system. The similarity between the C. violaceum sequences and those of Neisserie miningitidis and Ralstonia solanacearum was greater than that between the C. violaceum and Escherichia coli sequences. The peculiarities found in the C. violaceum genome were the absence of LexA, some horizontal transfer events and a large number of repair genes involved with alkyl and oxidative DNA damage.

  2. Health risk assessment linked to filling coastal quarries with treated dredged seaport sediments.

    Science.gov (United States)

    Perrodin, Yves; Donguy, Gilles; Emmanuel, Evens; Winiarski, Thierry

    2014-07-01

    Dredged seaport sediments raise complex management problems since it is no longer possible to discharge them into the sea. Traditional waste treatments are poorly adapted for these materials in terms of absorbable volumes and cost. In this context, filling quarries with treated sediments appears interesting but its safety regarding human health must be demonstrated. To achieve this, a specific methodology for assessing health risks has been developed and tested on three seaport sediments. This methodology includes the development of a conceptual model of the global scenario studied and the definition of specific protocols for each of its major steps. The approach proposed includes in particular the use of metrological and experimental tools that are new in this context: (i) an experimental lysimeter for characterizing the deposit emissions, and (ii) a geological radar for identifying potential preferential pathways between the sediment deposit and the groundwater. The application of this approach on the three sediments tested for the scenario studied showed the absence of health risk associated with the consumption of groundwater for substances having a "threshold effect" (risk quotient <1), and an acceptable risk for substances having a "non-threshold effect", with the notable exception of arsenic (individual risk equal to 3.10(-6)). Copyright © 2014 Elsevier B.V. All rights reserved.

  3. U-Pb zircon geochronology of Caledonian age orthogneisses dredged from the Chukchi Borderland, Arctic Ocean.

    Science.gov (United States)

    Brumley, K.; Miller, E. L.; Mayer, L. A.; Wooden, J.; Grove, M.

    2012-04-01

    Over 500 kilos of metamorphic rock was dredged from outcrops along a steep normal fault scarp in the central Chukchi Borderland in 2009 (HLY0905) from water depths of between about 2500-1400m. The rocks in the dredge included broken angular cobbles and boulder-sized samples of amphibolites, orthogneisses, and granitoids of the same amphibolite facies metamorphic grade, as well as gravel to small cobble-sized ice rafted debris of various rock types. Zircons were separated from two of the orthogneiss samples, and single grain zircon U-Pb ages were determined by SHRIMP analysis to be 428 Ma ± 3.4 for both samples (N=60). Several zircon grains had distinct igneous cores that ranged in age from about 928-1200 Ma (n=7) with two older grains (1700, 1760 Ma). The Caledonian orogenic belt developed in the Ordovician to Devonian affecting northern Europe, Greenland and Arctic Canada. Caledonian deformational trends continue into the Arctic and disappear at the rifted margin of the Arctic Ocean. Syn-orogenic magmatism in the Barents region date deformation in this region during the Caledonian event to have occurred between about 450-410 Ma (Johansson et al., 2005; Gee et al., 2006; Gee and Tebenkov, 2004). Grenville age plutons (900-1250Ma) that were later involved in Caledonian deformation and intruded by 410-450 Ma aged plutons are found on western and eastern Svalbard (Johansson et al., 2005), eastern Greenland, and the Pearya Terrane of northern Ellesmere Island (Trettin,1986, 1992). The Franklinian basement of Arctic Alaska and Canada do not share these Grenvillian ages (Trentin et al, 1987). This suggests that the inherited zircon cores in the Chukchi Borderland orthogneisses were derived, at least in part, from an older Grenvillian basement like that of Pearya, Svalbard and parts of Greenland, or through sediments eroded from these sources, and later intruded by Caledonian aged granites. This constrains the pre-rift location of the Chukchi Borderland to be within the

  4. Fate of cadmium in the rhizosphere of Arabidopsis halleri grown in a contaminated dredged sediment

    Energy Technology Data Exchange (ETDEWEB)

    Huguet, Séphanie, E-mail: huguet.st@gmail.com [ISTerre, Université Grenoble Alpes, CNRS, F-38041 Grenoble (France); Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE), Institut des sciences analytiques et de physico-chimie pour l' environnement et les matériaux (IPREM UMR 5254), Université de Pau et des Pays de l' Adour and CNRS, Hélioparc, 2 Av. Pierre Angot, 64053 Pau Cedex 9 (France); INERIS, Parc technologique Alata, 60550 Verneuil-en-Halatte (France); EMDouai, MPE-GCE, 930 Boulevard Lahure, 59500 Douai (France); Isaure, Marie-Pierre [Laboratoire de Chimie Analytique Bio-Inorganique et Environnement (LCABIE), Institut des sciences analytiques et de physico-chimie pour l' environnement et les matériaux (IPREM UMR 5254), Université de Pau et des Pays de l' Adour and CNRS, Hélioparc, 2 Av. Pierre Angot, 64053 Pau Cedex 9 (France); Bert, Valérie [INERIS, Parc technologique Alata, 60550 Verneuil-en-Halatte (France); Laboudigue, Agnès [EMDouai, MPE-GCE, 930 Boulevard Lahure, 59500 Douai (France); Proux, Olivier [OSUG, UMS832 CNRS/UJF, 414 rue de la piscine, 38400 Saint-Martin d' Hères (France); Flank, Anne-Marie; Vantelon, Delphine [Beamline LUCIA, SLS, Swiss Light Source, CH-5232 Villigen (Switzerland); Synchrotron SOLEIL, F-91192 Gif Sur Yvette (France); Sarret, Géraldine, E-mail: geraldine.sarret@ujf-grenoble.fr [ISTerre, Université Grenoble Alpes, CNRS, F-38041 Grenoble (France)

    2015-12-01

    In regions impacted by mining and smelting activities, dredged sediments are often contaminated with metals. Phytotechnologies could be used for their management, but more knowledge on the speciation of metals in the sediment and on their fate after colonization by plant roots is needed. This work was focused on a dredged sediment from the Scarpe river (North of France), contaminated with Zn and Cd. Zn, Cd hyperaccumulating plants Arabidopsis halleri from metallicolous and non-metallicolous origin were grown on the sediment for five months in a pot experiment. The nature and extent of the modifications in Cd speciation with or without plant were determined by electron microscopy, micro X-ray fluorescence and bulk and micro X-ray absorption spectroscopy. In addition, changes in Cd exchangeable and bioavailable pools were evaluated, and Cd content in leachates was measured. Finally, Cd plant uptake and plant growth parameters were monitored. In the original sediment, Cd was present as a mixed Zn, Cd, Fe sulfide. After five months, although pots still contained reduced sulfur, Cd-bearing sulfides were totally oxidized in vegetated pots, whereas a minor fraction (8%) was still present in non-vegetated ones. Secondary species included Cd bound to O-containing groups of organic matter and Cd phosphates. Cd exchangeability and bioavailability were relatively low and did not increase during changes in Cd speciation, suggesting that Cd released by sulfide oxidation was readily taken up with strong interactions with organic matter and phosphate ligands. Thus, the composition of the sediment, the oxic conditions and the rhizospheric activity (regardless of the plant origin) created favorable conditions for Cd stabilization. However, it should be kept in mind that returning to anoxic conditions may change Cd speciation, so the species formed cannot be considered as stable on the long term. - Highlights: • Cd was present as a mixed Zn, Cd, Fe sulfide in the sediment before

  5. Aircraft Propeller Hub Repair

    Energy Technology Data Exchange (ETDEWEB)

    Muth, Thomas R. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Peter, William H. [Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

    2015-02-13

    The team performed a literature review, conducted residual stress measurements, performed failure analysis, and demonstrated a solid state additive manufacturing repair technique on samples removed from a scrapped propeller hub. The team evaluated multiple options for hub repair that included existing metal buildup technologies that the Federal Aviation Administration (FAA) has already embraced, such as cold spray, high velocity oxy-fuel deposition (HVOF), and plasma spray. In addition the team helped Piedmont Propulsion Systems, LLC (PPS) evaluate three potential solutions that could be deployed at different stages in the life cycle of aluminum alloy hubs, in addition to the conventional spray coating method for repair. For new hubs, a machining practice to prevent fretting with the steel drive shaft was recommended. For hubs that were refurbished with some material remaining above the minimal material condition (MMC), a silver interface applied by an electromagnetic pulse additive manufacturing method was recommended. For hubs that were at or below the MMC, a solid state additive manufacturing technique using ultrasonic welding (UW) of thin layers of 7075 aluminum to the hub interface was recommended. A cladding demonstration using the UW technique achieved mechanical bonding of the layers showing promise as a viable repair method.

  6. Suitability of dredged material for reclamation of surface-mined land. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Harrison, W.; Van Luik, A.

    1979-12-01

    Eroding ridges of acidic coal-mine spoil in La Salle County, Illinois, were leveled to form a gently-sloped raised plateau. Four test plots were constructed: a control plot and three treatment plots that received a 0.9-m-thick cover of dredged material obtained from the Metropolitan Sanitary District of Greater Chicago. Two treatment plots received lime applications and all plots were seeded with a mixture of grasses. Pressure-vacuum soil water samplers were installed, in duplicate, at two levels in the control plot and at three levels in each treatment plot. The three levels in the treatment plots coincided with dredged material, the dredged-material mine-spoil interface, and the underlying mine spoil. Surface water, soil water, and groundwater were monitored for 29 water-quality parameters for one year. Rainfall, air temperature, runoff, and water-level elevation data were collected also. Detailed analysis of the data indicates that the dredged material used in this study does not adversely affect water quality; it supports abundant plant growth, lessens groundwater contamination, and controls acid runoff. The dredged material is judged to be a suitable material for use in reclamation of surface-mined land.

  7. Chemical characterisation of dredged sediments in relation to their potential use in civil engineering.

    Science.gov (United States)

    Zuliani, Tea; Mladenovič, Ana; Ščančar, Janez; Milačič, Radmila

    2016-04-01

    During capital and/or maintenance dredging operations, large amounts of material are produced. Instead of their discharge, dredged sediments may be a valuable natural resource if not contaminated. One of the possible areas of application is civil engineering. In the present work, the environmental status of seaport dredged sediment was evaluated in order to investigate its potential applicability as a secondary raw material. Sediments were analysed for element concentrations in digested samples, aqueous extracts and fractions from sequential extraction; for fluoride, chloride and sulphate concentrations in aqueous extracts; and for tributyltin (TBT). Granulometric and mineralogical compositions were also analysed. The elemental impact was evaluated by calculation of the enrichment factors. The total element concentrations determined showed moderate contamination of the dredged sediments as was confirmed also by their moderate enrichment factors, presumably as a result of industrial and port activities. Elemental concentrations in the aqueous extract were very low and therefore do not represent any hazard for the environment. The water-soluble element concentrations were under the threshold levels set by the EU Directive on the landfill of waste, on the basis of which the applicability of dredged sediments in civil engineering is evaluated, while the content of chloride and sulphate were above the threshold levels. It was found out that due to the large amounts of sediment available, civil engineering applications such as the construction of embankments and backfilling is the most beneficial recycling solution at present.

  8. Evaluation of dredged material proposed for ocean disposal from Bronx River Project Area, New York

    Energy Technology Data Exchange (ETDEWEB)

    Gruendell, B.D.; Gardiner, W.W.; Antrim, L.D.; Pinza, M.R.; Barrows, E.S.; Borde, A.B. [Battelle Marine Research Lab., Sequim, WA (United States)

    1996-12-01

    The objective of the Bronx River project was to evaluate proposed dredged material from the Bronx River project area in Bronx, New York, to determine its suitability for unconfined ocean disposal at the Mud Dump Site. Bronx River was one of five waterways that the US Army Corps of Engineers-New York District (USAGE-NYD) requested the Battelle Marine Sciences Laboratory (MSL) to sample and to evaluate for dredging and disposal. Sediment samples were submitted for physical and chemical analyses, chemical analyses of dredging site water and elutriate, benthic and water-column acute toxicity tests, and bioaccumulation studies. Fifteen individual sediment core samples collected from the Bronx River project area were analyzed for grain size, moisture content, and total organic carbon (TOC). One composite sediment sample, representing the entire reach of the area proposed for dredging, was analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAH), and 1,4- dichlorobenzene. Dredging site water and elutriate water, which was prepared from the suspended-particulate phase (SPP) of the Bronx River sediment composite, were analyzed for metals, pesticides, and PCBS.

  9. Evaluation of dredged material proposed for ocean Disposal from Shoal Harbor/Compton Creek Project Area

    Energy Technology Data Exchange (ETDEWEB)

    Gardiner, W.W.; Borde, A.B.; Nieukirk, S.L.; Barrows, E.S.; Gruendell, B.D.; Word, J.Q.

    1996-10-01

    The objective of the Shoal Harbor/Compton Creek Project was to evaluate proposed dredged material from the Shoal harbor/Compton Creek Project Area in Belford and Monmouth, New Jersey to determine its suitability for unconfined ocean disposal at the Mud Dump Site. This was one of five waterways that the US Army Corps of Engineers- New York District requested the Battelle Marine Sciences Laboratory (MSL) to sample and evaluate for dredging and disposal in May 1995. The evaluation of proposed dredged material from the Shoal Harbor/Compton Creek Project area consisted of bulk chemical analyses, chemical analyses of dredging site water and elutriate, benthic and water-column acute toxicity tests and bioaccumulation studies. Eleven core samples were analyzed or grain size, moisture content, and total organic carbon. Other sediments were evaluated for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congers, polynuclear aromatic hydrocarbons, and 1,4- dichlorobenzene. Dredging site water and elutriate water were analyzed for metals, pesticides, and PCBs.

  10. The Atchafalaya River Avulsion - control of Nature or control of dredging?

    Science.gov (United States)

    Shaw, J.; McCain, G.

    2016-12-01

    The Atchafalaya River (AR) - the primary distributary of the Mississippi River (MR) - increased the proportion of water it gathered from the MR from 17% in 1910 to 30% in 1950. This increase has been attributed primarily to natural causes such as the steeper slope to the Gulf of Mexico down the AR. Avulsion has always been considered natural and inevitable, facilitating the construction of control structures to regulate discharge partitioning. However, the increase can also be explained by the extensive dredging (1.7 x 107 m3 removed) and subsequent erosion (1.7 x 108 m3) in the AR between 1932 and 1948. We develop a 1-D backwater flow model to resolve bifurcation partitioning between the MR and AR, and apply it to bathymetry data collected by the US Army Corps of Engineers. Models comparing pre-dredging, proposed dredging, and post-dredging channels suggest that dredging can explain 77% of the increased discharge fraction down the AR between 1910 and 1950. These results highlight that channel deepening is more important than relative slopes for determining channel bifurcation partitioning and stability.

  11. The suitability evaluation of dredged soil from reservoirs as embankment material.

    Science.gov (United States)

    Park, Jaesung; Son, Younghwan; Noh, Sookack; Bong, Taeho

    2016-12-01

    We assessed the suitability of soil dredged from reservoirs as embankment material and investigated its physical and geochemical properties and strength parameters, as well as its environmental stability. The dredged soil samples were taken from the Ansung, Jechon, and Mulwang Reservoirs in Korea. To evaluate their environmental stability and geochemical properties, we examined their levels of heavy metal contamination, pH, and electrical conductivity. We also conducted X-ray fluorescence and X-ray diffraction analyses. Furthermore, we determined the geotechnical characteristics, such as the compaction characteristics, and permeability coefficient, and we performed consolidated undrained triaxial compression tests to evaluate the recycling potential of dredged soil as embankment material. The concentrations of heavy metals in the sediment samples were lower than those of the standard samples. The pH value of the soil samples ranged from 4.25 to 5.39, and the electrical conductivity ranged between 83.3 and 265.0 μS/cm, indicating suitability for use as construction material with steel and concrete. Based on the values of the mechanical properties of the dredged soil, analysis of slope stability was performed for various cases and water level conditions. Our results indicate that the dredged soil has sufficient stability for substitution of embankment material and also as new embankment material for expansion. Copyright © 2016 Elsevier Ltd. All rights reserved.

  12. Immobilised Phaeodactylum tricornutum as biomonitor of trace element availability in the water column during dredging.

    Science.gov (United States)

    Cabrita, Maria Teresa; Raimundo, Joana; Pereira, Patrícia; Vale, Carlos

    2014-03-01

    This work reports changes of Cr, Cu, Zn, Cd, Hg and Pb concentrations in the dissolved fraction, suspended particulate matter and immobilised Phaeodactylum tricornutum Bohlin (Bacillariophyceae), as well as of microalgae specific growth rates, during a 5-month period dredging operation in a contaminated area of the Tagus estuary, Portugal. Trace element concentrations showed broad variations in the dissolved fraction and suspended particulate matter, presumably reflecting rapid exchanges of redox-sensitive elements between water and particles, in conjunction with the dilution effect caused by the tidal excursion. Immobilised cells exposed to dredging environmental conditions showed significantly higher concentrations of Cr, Cu, Zn, Cd, Hg and Pb than under no dredging conditions. Concomitantly, specific cell growth was significantly lower, suggesting that elements released with dredging affect the microalgae physiology. The results obtained in this in situ work imply that the dissolved fraction and the suspended particulate matter are relatively ineffective indicators of the trace element enhancement during dredging and pointed out immobilised P. tricornutum as a reliable and efficient biomonitoring tool for the assessment of trace element remobilisation.

  13. Effect of cutter type on sediment pollutants release in channel dredging

    Science.gov (United States)

    Yu, Y. R.; Chen, Y.; Dong, M. M.; Yang, B. L.

    2016-08-01

    Dredging activities are often used to maintain existing navigation channels. However’ traditional dredging equipment inevitably leads to sediment resuspension and nutrient loading in water. In this work’ the existing cutter used for dredging was transformed environmentally to reduce the release amount of sediment pollutants’ and to avoid the formation of secondary pollution to water bodies. Simulated tests with a general cutter’ a spiral cutter’ along with a general and spiral cutter equipped with the anti-diffusion device were conducted respectively in this study. The change of pollutants concentration in overlying water was examined. The environmental performance of each different structure cutter was comparatively analysed as well. The result revealed that in channel dredging with a spiral cutter’ the release amount of sediment pollutants was less than with a general cutter’ and that a general/spiral cutter equipped with the anti-diffusion device could effectively reduce the release amount of sediment contaminants’ particularly the release of the nitrogen nutrient during the 1h after the dredging treatment. The best transformation scheme for a cutter suction dredger (CSD) in its environmental-protection function may be: a spiral cutter equipped with the anti-diffusion device.

  14. Recent trends in repair and refurbishing of steam turbine components

    Indian Academy of Sciences (India)

    A K Bhaduri; S K Albert; S K Ray; P Rodriguez

    2003-06-01

    The repair and refurbishing of steam generator components is discussed from the perspective of repair welding philosophy including applicable codes and regulations. Some case histories of repair welding of steam generator components are discussed with special emphasis on details of repair welding of cracked steam turbine blades and shrouds in some of the commercial nuclear power plants using procedures developed.

  15. Eye muscle repair - discharge

    Science.gov (United States)

    ... Lazy eye repair - discharge; Strabismus repair - discharge; Extraocular muscle surgery - discharge ... You or your child had eye muscle repair surgery to correct eye muscle ... term for crossed eyes is strabismus. Children most often ...

  16. Ventral hernia repair

    Science.gov (United States)

    ... page: //medlineplus.gov/ency/article/007661.htm Ventral hernia repair To use the sharing features on this page, please enable JavaScript. Ventral hernia repair is surgery to repair a ventral hernia. ...

  17. Brain aneurysm repair

    Science.gov (United States)

    ... aneurysm repair; Dissecting aneurysm repair; Endovascular aneurysm repair - brain; Subarachnoid hemorrhage - aneurysm ... Your scalp, skull, and the coverings of the brain are opened. A metal clip is placed at ...

  18. 75 FR 22524 - Ocean Dumping; Designation of Ocean Dredged Material Disposal Sites Offshore of the Siuslaw River...

    Science.gov (United States)

    2010-04-29

    ... AGENCY 40 CFR Part 228 Ocean Dumping; Designation of Ocean Dredged Material Disposal Sites Offshore of... according to the ocean dumping regulations at 40 CFR 227.13 and guidance developed by EPA and the Corps. In... acceptable for ocean dumping without further testing. Dredged material which does not meet the criteria of...

  19. Biosolids and dredged materials: alternative sources of nutrients for crop productivity and sustainability of pasture-based agroecosystem

    Science.gov (United States)

    Domestic sewage sludge or “biosolids” and lake-dredged materials are examples of materials that can be used to cut fertilizer costs in pasture-based animal agriculture. Sustainable biosolids and lake-dredged materials management is based upon controlling and influencing the quantity, quality and cha...

  20. Agricultural Rivers at Risk: Dredging Results in a Loss of Macroinvertebrates. Preliminary Observations from the Narew Catchment, Poland

    Directory of Open Access Journals (Sweden)

    Mateusz Grygoruk

    2015-08-01

    Full Text Available Ecosystem deterioration in small lowland agricultural rivers that results from river dredging entails a significant threat to the appropriate ecohydrological conditions of these water bodies, expressed as homogenization of habitats and loss of biodiversity. Our study was aimed at a comparison of abundance and taxonomic structure of bottom-dwelling macroinvertebrates in dredged and non-dredged stretches of small lowland rivers and tributaries of the middle Narew River, namely: Czaplinianka, Turośnianka, Dąb, and Ślina. The experimental setup was (1 to collect samples of the bottom material from the river stretches that either persisted in a non-modified state (dredging was not done there in the last few years or had been subjected to river dredging in the year of sampling; and (2 to analyze the abundance and taxonomic structure of macroinvertebrates in the collected samples. The study revealed that at the high level of statistical significance (from p = 0.025 to p = 0.001, the total abundance of riverbed macroinvertebrates in the dredged stretches of the rivers analyzed was approximately 70% lower than in non-dredged areas. We state that the dredging of small rivers in agricultural landscapes seriously affects their ecological status by negatively influencing the concentrations and species richness of benthic macroinvertebrates.

  1. Evaluation of Dredged Material Proposed for Ocean Disposal from Port Chester, New York

    Energy Technology Data Exchange (ETDEWEB)

    Barrows, E.S.; Mayhew, H.L.; Word, J.Q.; Tokos, J.J.S. [Battelle Marine Sciences Laboratory, Sequim, WA (United States)

    1996-08-01

    Port Chester was one of seven waterways that the US Army Corps of Engineers-New York District requested the Battelle Marine Sciences Laboratory to sample and evaluate for dredging and disposal in March 1994. Tests and analyses were conducted on Port Chester sediment core samples. Because the Port Chester area is located on the border between New York and southeast Connecticut, its dredged material may also be considered for disposal at the Central Long Island Sound Disposal Site. The sediment evaluation consisted of bulk sediment chemical analyses, chemical analyses of site water and dredged material elutriate preparations, water-column and benthic acute toxicity tests, and bioaccumulation studies. Individual sediment core samples collected from Port Chester were analyzed for grain size, moisture content, and total organic carbon. In addition, sediment was analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl congers, polynuclear aromatic hydrocarbons and 1,4-dichlorobenzene.

  2. Experimental Study on the Curing Effect of Dredged Sediments with Three Types of Curing Agents

    Directory of Open Access Journals (Sweden)

    Yan Lei-Ming

    2016-01-01

    Full Text Available Sediment solidification technology is widely used to dispose dredged sediment, three types of curing agents were used in this study to solidified the dredged sediment from shallows in Nantong with three types of curing agents: JY, ZL and FJ. The results showed that the optimal additive amounts of these three curing agents were 140g JY, 16g ZL, 2.0g FJ per 1000g of the dredged sediment respectively, their 28d USC were up to 2.48 MPa, 2.96 MPa and 3.00 MPa. JY has obvious early strength effect, which of FJ is not that obvious, but the later-stage strength of sediment solidified by FJ are relatively higher.

  3. Regulative Action of Meridian Dredging Abdominal Manipulation in Obesity Patient's fat Metabolism

    Institute of Scientific and Technical Information of China (English)

    LIU Ming-jun; WANG Zhi-hong; XIN Zhang; YUE Zhuo; JIANG Wan-ting

    2012-01-01

    Objective:use Meridian dredging abdominal manipulation to treat simple obesity,observes to the changes of fat metabolism.Methods:60 cases were treated by Meridian dredging abdominal manipulation.Through its own comparison before and after treatment to observes the changes of Lipid index and evaluate the effects of massage.Results:The lipid index changes obviously around the massage.Therapeutic effect of the treatment group was significantly better than the control group( P <0.05).The disparation of two groups' lipid、leptin and leptin receptor levels before and after the treatment have statistically significant ( P < 0.05).Conclusions:Meridian dredging abdominal manipulation can significantly reduce the lipid and leptin content,and improve the content of leptin receptors,and can promote the fat metabolism.

  4. Evaluation of dredged material proposed for ocean disposal from Arthur Kill Project Area, New York

    Energy Technology Data Exchange (ETDEWEB)

    Gruendell, B.D.; Barrows, E.S.; Borde, A.B. [Battelle Marine Sciences Lab., Sequim, WA (United States)

    1997-01-01

    The objective of the bioassay reevaluation of Arthur Kill Federal Project was to reperform toxicity testing on proposed dredged material following current ammonia reduction protocols. Arthur Kill was one of four waterways sampled and evaluated for dredging and disposal in April 1993. Sediment samples were recollected from the Arthur Kill Project areas in August 1995. Tests and analyses were conducted according to the manual developed by the USACE and the U.S. Environmental Protection Agency (EPA), Evaluation of Dredged Material Proposed for Ocean Disposal (Testing Manual), commonly referred to as the {open_quotes}Green Book,{close_quotes} and the regional manual developed by the USACE-NYD and EPA Region II, Guidance for Performing Tests on Dredged Material to be Disposed of in Ocean Waters. The reevaluation of proposed dredged material from the Arthur Kill project areas consisted of benthic acute toxicity tests. Thirty-three individual sediment core samples were collected from the Arthur Kill project area. Three composite sediments, representing each reach of the area proposed for dredging, was used in benthic acute toxicity testing. Benthic acute toxicity tests were performed with the amphipod Ampelisca abdita and the mysid Mysidopsis bahia. The amphipod and mysid benthic toxicity test procedures followed EPA guidance for reduction of total ammonia concentrations in test systems prior to test initiation. Statistically significant acute toxicity was found in all Arthur Kill composites in the static renewal tests with A. abdita, but not in the static tests with M. bahia. Statistically significant acute toxicity and a greater than 20% increase in mortality over the reference sediment was found in the static renewal tests with A. abdita. M. bahia did not show statistically significant acute toxicity or a greater than 10% increase in mortality over reference sediment in static tests. 5 refs., 2 figs., 2 tabs.

  5. Evaluation of dredged material proposed for ocean disposal from Hackensack River Project Area, New York

    Energy Technology Data Exchange (ETDEWEB)

    Gruendell, B.D.; Barrows, E.S.; Borde, A.B. [Battelle Marine Sciences Lab., Sequim, WA (United States)

    1997-01-01

    The objective of the bioassay reevaluation of the Hackensack River Federal Project was to reperform toxicity testing on proposed dredged material with current ammonia reduction protocols. Hackensack River was one of four waterways sampled and evaluated for dredging and disposal in April 1993. Sediment samples were re-collected from the Hackensack River Project area in August 1995. Tests and analyses were conducted according to the manual developed by the USACE and the U.S. Environmental Protection Agency (EPA), Evaluation of Dredged Material Proposed for Ocean Disposal (Testing Manual), commonly referred to as the {open_quotes}Green Book,{close_quotes} and the regional manual developed by the USACE-NYD and EPA Region II, Guidance for Performing Tests on Dredged Material to be Disposed of in Ocean Waters. The reevaluation of proposed dredged material from the Hackensack River project area consisted of benthic acute toxicity tests. Thirty-three individual sediment core samples were collected from the Hackensack River project area. Three composite sediments, representing each reach of the area proposed for dredging, were used in benthic acute toxicity testing. Benthic acute toxicity tests were performed with the amphipod Ampelisca abdita and the mysid Mysidopsis bahia. The amphipod and mysid benthic toxicity test procedures followed EPA guidance for reduction of total ammonia concentrations in test systems prior to test initiation. Statistically significant acute toxicity was found in all three Hackensack River composites in the static renewal tests with A. abdita, but not in the static tests with M. bahia. Statistically significant acute toxicity and a greater than 20% increase in mortality over the reference sediment was found in the static renewal tests with A. abdita. Statistically significant mortality 10% over reference sediment was observed in the M. bahia static tests. 5 refs., 2 figs., 2 tabs.

  6. Evaluation of dredged material proposed for ocean disposal from Eastchester Project Area, New York

    Energy Technology Data Exchange (ETDEWEB)

    Antrim, L.D.; Pinza, M.R.; Barrows, E.S.; Gardiner, W.W.; Tokos, J.J.S.; Gruendell, B.D.; Word, J.Q. [Battelle Marine Research Lab., Sequim, WA (United States)

    1996-07-01

    The objective of the Eastchester project (Federal Project [FP] No. 6) was to evaluate proposed dredged material from the Eastchester project area in the Hutchinson River to determine its suitability for unconfined ocean disposal at the Mud Dump Site. Eastchester was one of seven waterways that the U. S. Army Corps of Engineers-New York District (USACE-NYD) requested the Battelle/Marine Sciences Laboratory (MSL) to sample and evaluate for dredging and disposal in March 1994. The evaluation of proposed dredged material from the Eastchester project area consisted of bulk sediment chemical analyses, chemical analyses of dredging site water and elutriate, water- column and benthic acute toxicity tests, and bioaccumulation studies. Eighteen individual sediment core samples collected from the Eastchester project area were analyzed for grain size, moisture content, and total organic carbon (TOC). Two composite sediment samples, representing the upstream and lower reaches of the area proposed for dredging, were analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAHs), and 1,4- dichlorobenzene. Dredging site water and elutriate water, which is prepared from the suspended-particulate phase (SPP) of the two Eastchester sediment composites, were analyzed for metals, pesticides, and PCBS. An additional 1 1 composite samples were created for the USACE-New England Division (USACE-NED) using the same 18 Eastchester core samples but combined into different composites. These composites were analyzed for metals, chlorinated pesticides, PCB congeners, PAHS, and 1,4-dichlorobenzene. Water-column or SPP toxicity tests were performed along with bioaccumulation tests.

  7. Minimally disruptive schedule repair for MCM missions

    Science.gov (United States)

    Molineaux, Matthew; Auslander, Bryan; Moore, Philip G.; Gupta, Kalyan M.

    2015-05-01

    Mine countermeasures (MCM) missions entail planning and operations in very dynamic and uncertain operating environments, which pose considerable risk to personnel and equipment. Frequent schedule repairs are needed that consider the latest operating conditions to keep mission on target. Presently no decision support tools are available for the challenging task of MCM mission rescheduling. To address this capability gap, we have developed the CARPE system to assist operation planners. CARPE constantly monitors the operational environment for changes and recommends alternative repaired schedules in response. It includes a novel schedule repair algorithm called Case-Based Local Schedule Repair (CLOSR) that automatically repairs broken schedules while satisfying the requirement of minimal operational disruption. It uses a case-based approach to represent repair strategies and apply them to new situations. Evaluation of CLOSR on simulated MCM operations demonstrates the effectiveness of case-based strategy. Schedule repairs are generated rapidly, ensure the elimination of all mines, and achieve required levels of clearance.

  8. Current Biomechanical Concepts for Rotator Cuff Repair

    Science.gov (United States)

    2013-01-01

    For the past few decades, the repair of rotator cuff tears has evolved significantly with advances in arthroscopy techniques, suture anchors and instrumentation. From the biomechanical perspective, the focus in arthroscopic repair has been on increasing fixation strength and restoration of the footprint contact characteristics to provide early rehabilitation and improve healing. To accomplish these objectives, various repair strategies and construct configurations have been developed for rotator cuff repair with the understanding that many factors contribute to the structural integrity of the repaired construct. These include repaired rotator cuff tendon-footprint motion, increased tendon-footprint contact area and pressure, and tissue quality of tendon and bone. In addition, the healing response may be compromised by intrinsic factors such as decreased vascularity, hypoxia, and fibrocartilaginous changes or aforementioned extrinsic compression factors. Furthermore, it is well documented that torn rotator cuff muscles have a tendency to atrophy and become subject to fatty infiltration which may affect the longevity of the repair. Despite all the aforementioned factors, initial fixation strength is an essential consideration in optimizing rotator cuff repair. Therefore, numerous biomechanical studies have focused on elucidating the strongest devices, knots, and repair configurations to improve contact characteristics for rotator cuff repair. In this review, the biomechanical concepts behind current rotator cuff repair techniques will be reviewed and discussed. PMID:23730471

  9. The Performance of Nearshore Dredge Disposal at Ocean Beach, San Francisco, California, 2005-2007

    Science.gov (United States)

    Barnard, Patrick L.; Erikson, Li H.; Hansen, Jeff E.; Elias, Edwin

    2009-01-01

    Ocean Beach, California, contains an erosion hot spot in the shadow of the San Francisco ebb tidal delta that threatens valuable public infrastructure as well as the safe recreational use of the beach. In an effort to reduce the erosion at this location a new plan for the management of sediment dredged annually from the main shipping channel at the mouth of San Francisco Bay was implemented in May 2005 by the United States Army Corps of Engineers, San Francisco District (USACE). The USACE designated a temporary nearshore dredge disposal site for the annual disposal of about 230,000 m3 (300,000 yd3) of sand about 750 m offshore and slightly south of the erosion hot spot, in depths between approximately 9 and 14 m. The site has now been used three times for a total sediment disposal of about 690,000 m3 (about 900,000 yds3). The disposal site was chosen because it is in a location where strong tidal currents and open-ocean waves can potentially feed sediment toward the littoral zone in the reach of the beach that is experiencing critical erosion, as well as prevent further scour on an exposed outfall pipe. The onshore migration of sediment from the target disposal location might feed the primary longshore bar or the nearshore zone, and provide a buffer to erosion that peaks during winter months when large waves impact the region. The United States Geological Survey (USGS) has been monitoring and modeling the bathymetric evolution of the test dredge disposal site and the adjacent coastal region since inception in May 2005. This paper reports on the first 2.5 years of this monitoring program effort (May 2005 to December 2007) and assesses the short-term coastal response. Here are the key findings of this report: *Approximately half of the sediment that has been placed in the nearshore dredge-disposal site during the 2.5 years of this study remains within the dredge focus area. *In the winter of 2006-7, large waves transported the dredge-mound material onshore. *High

  10. DNA repair deficiency in neurodegeneration

    DEFF Research Database (Denmark)

    Jeppesen, Dennis Kjølhede; Bohr, Vilhelm A; Stevnsner, Tinna V.

    2011-01-01

    : homologous recombination and non-homologous end-joining. Ataxia telangiectasia and related disorders with defects in these pathways illustrate that such defects can lead to early childhood neurodegeneration. Aging is a risk factor for neurodegeneration and accumulation of oxidative mitochondrial DNA damage......Deficiency in repair of nuclear and mitochondrial DNA damage has been linked to several neurodegenerative disorders. Many recent experimental results indicate that the post-mitotic neurons are particularly prone to accumulation of unrepaired DNA lesions potentially leading to progressive...... neurodegeneration. Nucleotide excision repair is the cellular pathway responsible for removing helix-distorting DNA damage and deficiency in such repair is found in a number of diseases with neurodegenerative phenotypes, including Xeroderma Pigmentosum and Cockayne syndrome. The main pathway for repairing oxidative...

  11. Investigation of Comparative Mosquito Breeding in Dredged Material Disposal Sites Used in the Maintenance Dredging of the Atlantic Intra-Coastal Waterway in South Carolina.

    Science.gov (United States)

    1978-01-01

    The possible use of this technique in older disposal areas, which are no longer used for disposal of dredged material, should not be ruled out however...chemistry profiles reported in this study do not rule out the possibility of chemically altering the substrate composi- tion in a manner which makes the...Bionomics and embryology of the inland floodwater mosquito . .. .’. Univ. of Illinois Press. 2 11pp. S Jeane, G. S., II, and R. E. Pine. 1975

  12. 自主式微型管道疏通车疏通驱动系统研究%Research on Dredge Driving System of Autonomous Miniature Pipeline Dredge Vehicle

    Institute of Scientific and Technical Information of China (English)

    琚立颖; 龙海洋; 李耀刚

    2016-01-01

    A miniature dredge pipeline dredge vehicle system design scheme was presented.The dredging driving system was the key component of the autonomous drainage dredging robot, achieving the function of dredging by means of driving the executive compo-nent.In the new dredging driving system, the synchronous belt was used as the executive component, the hydraulic motor was used as the actuator.Comparing with the traditional motor driving system, it is of fast speed of response, sensitiveness, wide speed regulating scope and long service life.The research on dredging driving system of the autonomous drainage dredging robot will improve the effi-ciency of dredging.%提出一种微型管道疏通车疏通驱动系统的设计方案。该疏通驱动系统是自主式微型管道疏通车的关键部分,通过驱动执行元件实现管道疏通车的疏通功能。新设计的疏通驱动系统采用同步带机构作为执行元件,液压马达作为驱动元件。它与传统的电机驱动系统相比,反应速度快、灵敏,调速范围广,寿命长。自主式微型管道疏通车疏通驱动系统的研究将提高管道疏通的效率。

  13. Petrography and U-Pb zircon geochronology of Caledonian age orthogneisses dredged from the Chukchi Borderland, Arctic Ocean

    Science.gov (United States)

    Brumley, K.; Miller, E. L.; Mayer, L. A.; Wooden, J. L.; Dumitru, T. A.

    2011-12-01

    The Caledonian orogenic belt developed in the Ordovician to Devonian affecting northern Europe, Greenland and Arctic Canada. Caledonian deformational trends continue into the Arctic region disappearing at the rifted margin of the Arctic Ocean. Syn-orogenic magmatism in the Barents region date deformation of Grenvillian basement during the Caledonian event to be between about 450-410 Ma (Johansson et al., 2005; Gee et al., 2006; Gee and Tebenkov, 2004). Over 500 kilos of metamorphic rock was dredged from outcrops in the central Chukchi Borderland in 2009 (HLY0905) that included amphibolites and orthogneisses metamorphosed to amphibolite facies continuing to deform under greenschist conditions. Zircons were separated from two orthogneiss samples from this dredge, and single grain zircon U-Pb ages were determined by SHRIMP analysis be 428 Ma ± 3.4 for both samples (N=60). One sample had several zircon grains with distinct igneous cores that ranged in age from about 850-1000 Ma. Grenville age plutons (1000-910 Ma) that were later involved in Caledonian deformation and intruded by 450-410 Ma aged plutons are found on western and eastern Svalbard (Johansson et al., 2005), eastern Greenland, and the Pearya Terrane of northern Ellesmere Island (Trettin,1986, 1992). The Franklinian basement of Arctic Alaska and Canada do not share these Grenvillian ages (Trentin et al, 1987). This suggests that the inherited zircon cores in the Chukchi Borderland orthogneisses were derived, at least in part, from an older Grenvillian basement like that of Pearya, Svalbard and parts of Greenland and later intruded by Caledonian aged granites.

  14. Predicting dredging-associated effects to coral reefs in Apra Harbor, Guam - Part 2: Potential coral effects.

    Science.gov (United States)

    Nelson, Deborah Shafer; McManus, John; Richmond, Robert H; King, David B; Gailani, Joe Z; Lackey, Tahirih C; Bryant, Duncan

    2016-03-01

    Coral reefs are in decline worldwide due to anthropogenic stressors including reductions in water and substratum quality. Dredging results in the mobilization of sediments, which can stress and kill corals via increasing turbidity, tissue damage and burial. The Particle Tracking Model (PTM) was applied to predict the potential impacts of dredging-associated sediment exposure on the coral reef ecosystems of Apra Harbor, Guam. The data were interpreted using maps of bathymetry and coral abundance and distribution in conjunction with impact parameters of suspended sediment concentration (turbidity) and sedimentation using defined coral response thresholds. The results are presented using a "stoplight" model of negligible or limited impacts to coral reefs (green), moderate stress from which some corals would be expected to recover while others would not (yellow) and severe stress resulting in mortality (red). The red conditions for sediment deposition rate and suspended sediment concentration (SSC) were defined as values exceeding 25 mg cm(-2) d(-1) over any 30 day window and >20 mg/l for any 18 days in any 90 day period over a column of water greater than 2 m, respectively. The yellow conditions were defined as values >10 mg cm(-2) d(-1) and assumption that even sub-lethal stress levels can ultimately lead to mortality in a multi-stressor system. This modeling approach can be applied by resource managers and regulatory agencies to support management decisions related to planning, site selection, damage reduction, and compensatory mitigation.

  15. PHYTOREMEDIATION OF DREDGED SEDIMENTS: A CASE STUDY AT THE JONES ISLAND CDF

    Science.gov (United States)

    The Jones Island Confined Disposal Facility (CDF) is a 44 acre in-lake area that receives dredged material from Milwaukee Harbor and the surrounding waterways. Some of those materials are contaminated with industrial waste and urban run-off. The CDF is nearing the end of its desi...

  16. Verification of Design and Construction Techniques for Gaillard Island Dredged Material Disposal Area, Mobile, Alabama.

    Science.gov (United States)

    1986-08-01

    34turbidity plume study" was conducted by Timothy Sullivan, of the MDO. The purpose of the study was to determine the thickness and aerial ex- tent of a...actual velume cut from the channel would be only 7.2 million cubic yards. 92. The Lenel Bean dredge excavated about 5.3 million cubic yards of material

  17. Evaluation of dredged material proposed for ocean disposal from Liberty Island Anchorage, New York

    Energy Technology Data Exchange (ETDEWEB)

    Pinza, M.R.; Barrows, E.S.; Word, J.Q.

    1966-11-01

    Sediment samples were collected from the Liberty Island Anchorage and Military Ocean Terminal in Bayonne, New Jersey (MOTBY), during a survey conducted from June 7 through June 10, 1994. Tests and analyses were conducted on Liberty Island Anchorage sediment core samples according to the manual developed by the U.S. Army Corps of Engineers (USACE) and the U.S. Environmental Protection Agency (EPA), Evaluation of Dredged Material Proposed for Ocean Disposal (Testing Manual), and the regional manual developed by the USACE-New York District (NYD) and EPA Region 11, Guidance for Performing Tests on Dredged Material to be Disposed of in Ocean Waters. The evaluation of proposed dredged material from Liberty Island Anchorage consisted of bulk sediment chemical analyses, chemical analyses of site water and elutriate, and water-column and benthic acute toxicity tests. Individual sediment core samples collected from Liberty Island Anchorage were analyzed for grain size, moisture content, and total organic carbon (TOC). A composite sediment sample, representing the entire area proposed for dredging, was analyzed for bulk density, metals, chlorinated pesticides, polychlorinated-biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAH), 1,4-dichlorobenzene, and dioxin/furan congeners. Site water and elutriate water, prepared from the suspended- particulate phase (SPP) of Liberty Island Anchorage sediment, were analyzed for metals, pesticides, and PCBS.

  18. Water Resources Research Program. Abatement of malodors at diked, dredged-material disposal sites. Final report

    Energy Technology Data Exchange (ETDEWEB)

    Harrison, W.; Dravnieks, A.; Zussman, R.; Goltz, R.

    1976-06-01

    Samples of malodorous air and dredged material were collected at diked disposal sites at the following locations: Buffalo, NY; Milwaukee, WI; Mobile, AL; York Harbor, ME; Houston, TX; Detroit, MI; and Anacortes, WA; during the period July--October, 1975. Odorous compounds in the air samples were identified by gas chromatography/mass spectrometry, while the detection threshold, intensity, and character of the various odors were determined by experienced panelists using a dynamic, forced-choice-triangle olfactometer. Although significant problems with malodors were not observed beyond the disposal-area dikes during site visits, noteworthy odor episodes had occurred at some sites. An odor-abatement strategy is presented for handling the expected range of odor conditions at dredged-material disposal sites. Its aim is to reduce to an acceptable level the intensity of malodors in an affected community. The main steps in the strategy cover selection of the disposal site, site preparation, odor characterization of sediments to be dredged, malodor abatement during dredging and disposal operations, malodor abatement after filling of the disposal site, and the handling of malodor complaints.

  19. 75 FR 54497 - Ocean Dumping; Guam Ocean Dredged Material Disposal Site Designation

    Science.gov (United States)

    2010-09-08

    .... Location in relation to breeding, spawning, nursery, feeding, or passage areas of living resources in adult...\\). Dredged material is expected to be released from split hull barges. 5. Feasibility of surveillance and... extraction, desalination, fish and shellfish culture, areas of special scientific importance, and...

  20. On dredged specimens of Anancus, Archidiskodon, and Equus from the Schelde Estuary, Netherlands

    NARCIS (Netherlands)

    Hooyer, D.A.

    1952-01-01

    Last year Prof. Dr. I.M. van der Vlerk brought to my attention a collection of fossil remains of mammals dredged up in the East Schelde, province of Zeeland, Netherlands. The fossils were obtained by the Schot brothers of the ZZ 8 from the bottom of a through ca. 1500 m long, 200 m wide, and 35 to 4

  1. 78 FR 38672 - Ocean Dumping; Sabine-Neches Waterway (SNWW) Ocean Dredged Material Disposal Site Designation

    Science.gov (United States)

    2013-06-27

    ... AGENCY 40 CFR Part 228 Ocean Dumping; Sabine-Neches Waterway (SNWW) Ocean Dredged Material Disposal Site... Entities B. Background C. Disposal Volume Limit D. Site Management and Monitoring Plan E. Ocean Dumping.... Ocean Dumping Site Designation Criteria In proposing to designate these Sites, the EPA assessed...

  2. 75 FR 19311 - Ocean Dumping; Guam Ocean Dredged Material Disposal Site Designation

    Science.gov (United States)

    2010-04-14

    ... dredged material disposal activities will not unreasonably degrade or endanger human health, welfare, the... specific errors, missing information, or outdated information, and the Final EIS was revised and updated... an appropriate upland location. Mitigation Mitigation for unavoidable resource losses as a result of...

  3. Controlling toxic cyanobacteria: effects of dredging and phosphorus-binding clay on cyanobacteria and microcystins

    NARCIS (Netherlands)

    Lürling, M.F.L.L.W.; Faassen, E.J.

    2012-01-01

    Sediment dredging and Phoslock(®) addition were applied individually and in combination in an enclosure experiment in a Dutch hypertrophic urban pond. These measures were applied to control eutrophication and reduce the risk of exposure to cyanobacterial toxins. Over the 58 days course of the experi

  4. Reclamation of abandoned mined lands along th Upper Illinois Waterway using dredged material

    Energy Technology Data Exchange (ETDEWEB)

    Van Luik, A; Harrison, W

    1982-01-01

    Sediments were sampled and characterized from 28 actual or proposed maintenance-dredging locations in the Upper Illinois Waterway, that is, the Calumet-Sag Channel, the Des Plaines River downstream of its confluence with the Calumet-Sag Channel, and the Illinois River from the confluence of the Kankakee and Des Plaines rivers to Havana, Illinois. Sufficient data on chemical constituents and physical sediments were obtained to allow the classification of these sediments by currently applicable criteria of the Illinois Environmental Protection Agency for the identification of hazardous, persistent, and potentially hazardous wastes. By these criteria, the potential dredged materials studied were not hazardous, persistent, or potentially hazardous; they are a suitable topsoil/ reclamation medium. A study of problem abandoned surface-mined land sites (problem lands are defined as being acidic and/or sparsely vegetated) along the Illinois River showed that three sites were particularly well suited to the needs of the Corps of Engineers (COE) for a dredged material disposal/reclamation site. Thes sites were a pair of municipally owned sites in Morris, Illinois, and a small corporately owned site east of Ottawa, Illinois, and adjacent to the Illinois River. Other sites were also ranked as to suitability for COE involvement in their reclamation. Reclamation disposal was found to be an economically competitive alternative to near-source confined disposal for Upper Illinois Waterway dredged material.

  5. Social and Economic Impacts of Selected Potential Dredged Material Containment Facilities in Long Island Sound.

    Science.gov (United States)

    1981-09-01

    Vicksburg, Mississippi, December 1978. (Technical Report DS-78-20) 6. Environmental Laboratory, 0. Beeman , and A.P. Benkendorf. Land Use of Dredged...London, CT (203) 443-4388 Richard Soj Air Quality Engineering Division Donald R. Sloan, Chief of Police CT Department of Environmental Protection City

  6. Polycyclic aromatic hydrocarbon-polluted dredged peat sediments and earthworms: a mutual interference

    NARCIS (Netherlands)

    Eijsackers, H.J.P.; Jonge, de S.; Muijs, B.; Slijkerman, D.; Gestel, van C.A.M.

    2001-01-01

    In lowland areas of the Netherlands, any peat sediments will gradually become enriched with anthropogenically derived Polycyclic Aromatic Hydrocarbons. Due to Dutch policy standards these (anaerobic) sediments are not allowed to be dredged and placed onto land. Under aerobic conditions, however, bio

  7. Dredged material characterization and management frameworks: A case study at the port Vilagarcia (NW, Spain).

    Science.gov (United States)

    Rodríguez-Romero, Araceli; Khosrovyan, Alla; DelValls, T Angel; Riba, Inmaculada

    2016-01-25

    The potential impact of dredged sediment has been assessed at sixteen areas of the high-traffic port of Vilagarcia (Northwest Spanish Atlantic coast). The assessment has been done by three weight-of-evidence tools, which integrated data on sediment characteristics and toxicity responses of Ampelisca brevicornis, Vibrio fischeri and eggs and embryos of Paracentrotus lividus. Two of the tools also represented management options regarding the disposal of dredged material. The comparison of the logic in these tools revealed essential differences in the type and the necessity of bioassays and threshold values for chemical concentrations. However, despite this difference, assessment results and the derived management options coincided in most of the sediments. The potential toxicity of sediments was relatively low especially for eggs and embryos possibly due to different contaminant availability in solid and liquid phases. The importance of a battery of toxicity tests in the dredged material quality assessment has been emphasized to avoid an underestimation of sediment toxicity for solid phase organisms, if only liquid phase responses are considered. The potential false implications, which may result from the application of the third tool, were highlighted. The strengths and weaknesses of the tools were discussed from the dredged material management perspective. Copyright © 2015 Elsevier B.V. All rights reserved.

  8. An 'Early Warning System' for the prevention of dredging potential impacts on sensitive areas

    Science.gov (United States)

    Piermattei, Viviana; Martellucci, Riccardo; Pierattini, Alberto; Bonamano, Simone; Paladini de Mendoza, Francesco; Albani, Marta; Stefanì, Chiara; Madonia, Alice; Fersini, Giorgio; Marcelli, Marco

    2016-04-01

    Coastal marine ecosystems are increasingly subject to multiple pressures and stressors produced by the effects of human activities. Intense and frequent disturbances which affect marine environment can derive from dredging activity, which is a fundamental management for most ports and harbours. The potential environmental effects of dredging procedures are generally due to the excavation of material from the sea bottom and the relocation elsewhere for disposal, overflow from the dredger and loss of material from pipelines during transport. Depending on the location and the intensity of these activities the marine environment, particularly sensitive areas, may be affected by dredging. The main environmental effects can be associated with suspended sediments and increases in turbidity into the water column, which can have adverse effects on marine animals and plants by reducing light penetration and by physical disturbance. For this reason it is fundamental to implement a real time monitoring system to control and prevent negative effects, enabling a rapid response to adverse water quality conditions and a fast activation of mitigation procedures, in agreement with all the reference authorities. In this work we present the development of an innovative 'Early Warning System' based on fixed stations, ad hoc in situ surveys and forecasting models, which was applied to a dredging activity carried out in the Gulf of Gaeta (Latium, Italy). It represents an extension of the C-CEMS (Civitavecchia Coastal Environmental Monitoring System) network, which is operative in the Tyrrhenian sea since 2005.

  9. The environmental impact and recovery at two dumping sites for dredged material in the North Sea

    NARCIS (Netherlands)

    Stronkhorst, J.; Ariese, F.; Hattum, van B.; Postma, J.F.; Kluijver, de M.; Besten, den P.; Bergman, M.J.N.; Daan, R.; Murk, A.J.; Vethaak, A.D.

    2003-01-01

    The environmental impact and recovery associated with the long and uninterrupted disposal of large volumes of moderately contaminated dredged material from the port of Rotterdam was studied at nearby dumping sites in the North Sea. Observations were made on sediment contamination, ecotoxicity, bioma

  10. Identifying, Planning, and Financing Beneficial Use Projects Using Dredged Material: Beneficial Use Planning Manual

    Science.gov (United States)

    2007-10-01

    the website’s foundation by providing practical guidance for project sponsors (e.g., government agencies, port authorities, marinas , industries, and...parks provid- ing such amenities as swimming, picnicking, camping, or boating. 4. Agriculture, Forestry, Horticulture, and Aquaculture : using dredged...Development Beach Nourishment (offshore berms only) Parks and Recreation Agriculture, Forestry, Horticulture, and Aquaculture Strip-Mine Reclamation

  11. Application of bioassays in toxicological hazard, risk and impact assessments of dredged sediments

    NARCIS (Netherlands)

    Schipper, C.A.; Rietjens, I.M.C.M.; Burgerss, R.M.; Murk, A.J.

    2010-01-01

    Given the potential environmental consequences of dumped dredged harbour sediments it is vital to establish the potential risks from exposure before disposal at sea. Currently, European legislation for disposal of contaminated sediments at sea is based on chemical analysis of a limited number of wel

  12. Phytoplankton community indicators of changes associated with dredging in the Tagus estuary (Portugal).

    Science.gov (United States)

    Cabrita, Maria Teresa

    2014-08-01

    This work reports changes in suspended particulate matter, turbidity, dissolved Cr, Ni, Cu, Cd, Hg and Pb concentrations, and phytoplankton biomass and composition during a 5-month period dredging operation, in a trace element contaminated area of the Tagus estuary (Portugal). Phytoplankton biomass, diatom:other groups ratio, benthic:pelagic diatom ratio, Margalef's, Simpson's diversity, Shannon-Wiever's, and Warwick and Clarke's taxonomic diversity and distinctness indices, and individual taxa were investigated as indicators of dredging induced changes. Significant rise in sediment resuspension and trace element mobilisation caused by dredging influenced the community structure but not the overall biomass. Benthic diatom displacement into the water column maintained species diversity, and therefore, none of the indices highlighted community changes. Contrastingly, diatom:other groups ratio and benthic:pelagic diatom ratio were reliable indicators for the assessment of dredging induced changes. A shift in composition towards species less susceptible to trace elements was observed, disclosing some individual taxa as potential indicators. Copyright © 2014 Elsevier Ltd. All rights reserved.

  13. The impact of dredging on residence time in the Amba estuary, west coast of India

    Digital Repository Service at National Institute of Oceanography (India)

    Velamala, S.N.; Thomas, J.; Bari, S.; Kachave, S.

    in the model domain during low water and high water slacks of spring and neap for the pre- and post-dredging scenarios in dry and wet seasons indicates very high RTs in the mouth segment during flood due to the transport of particles in the eastern shallow...

  14. 78 FR 11094 - Safety Zone; Lake Worth Dredge Operations, Lake Worth Inlet; West Palm Beach, FL

    Science.gov (United States)

    2013-02-15

    ... Guard is establishing a temporary safety zone on Lake Worth Inlet, West Palm Beach, Florida, to provide..., February 20, 2013, dredging operations will be conducted on Lake Worth Inlet in West Palm Beach, Florida... the southwestern corner of Singer Island and then due south across the inlet to Palm Beach...

  15. Ecological evaluation of proposed dredged material from St. Andrew Bay, Florida

    Energy Technology Data Exchange (ETDEWEB)

    Mayhew, H.L.; Word, J.Q.; Kohn, N.P.; Pinza, M.R.; Karle, L.M.; Ward, J.A. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1993-10-01

    The US Army Corps of Engineers (USACE), Mobile District, requested that the Battelle/Marine Sciences Laboratory (MSL) conduct field sampling and chemical and biological testing to determine the suitability of potential dredged material for open ocean disposal. Sediment from St. Andrew Bay was chemically characterized and evaluated for biological toxicity and bioaccumulation of contaminants. The Tier III guidance for ocean disposal testing requires tests of water column effects (following dredged material disposal), deposited sediment toxicity, and bioaccumulation of contaminants from deposited sediment (dredged material). To meet these requirements, the MSL conducted suspended-particulate-phase (SPP) toxicity tests, solid-phase toxicity tests, and bioaccumulation testing on sediment representing potential dredged material from Panama City Harbor. Physical and chemical characterization of sediment to support toxicity and bioaccumulation results was also conducted on both the test and reference sediments. The MSL collected sediment samples from five sites in St. Andrew Bay and one reference site near Lands End Peninsula. The five test sediments and the reference sediment were analyzed for physical and chemical sediment characteristics, SPP chemical contaminants, solid-phase toxicity, SPP toxicity, and bioaccumulation of contaminants.

  16. DNA repair. [UV radiation

    Energy Technology Data Exchange (ETDEWEB)

    Setlow, R.

    1978-01-01

    Some topics discussed are as follows: difficulty in extrapolating data from E. coli to mammalian systems; mutations caused by UV-induced changes in DNA; mutants deficient in excision repair; other postreplication mechanisms; kinds of excision repair systems; detection of repair by biochemical or biophysical means; human mutants deficient in repair; mutagenic effects of UV on XP cells; and detection of UV-repair defects among XP individuals. (HLW)

  17. Long-term outcomes of the Bankart and Latarjet repairs: a systematic review

    National Research Council Canada - National Science Library

    Rollick NC; Ono Y; Kurji HM; Nelson AA; Boorman RS; Thornton GM; Lo IK

    2017-01-01

    ...: The most common surgical techniques for the treatment of recurrent anterior shoulder instability include the arthroscopic Bankart repair, the open Bankart repair and the open Latarjet procedure...

  18. Recovery of floral and faunal communities after placement of dredged material on seagrasses in Laguna Madre, Texas

    Science.gov (United States)

    Sheridan, P.

    2004-03-01

    The objectives of this project were to determine how long alterations in habitat characteristics and use by fishery and forage organisms were detectable at dredged material placement sites in Laguna Madre, Texas. Water, sediment, seagrass, benthos, and nekton characteristics were measured and compared among newly deposited sediments and nearby and distant seagrasses each fall and spring over three years. Over this period, 75% of the estimated total surface area of the original deposits was either re-vegetated by seagrass or dispersed by winds and currents. Differences in water and sediment characteristics among habitat types were mostly detected early in the study. There were signs of steady seagrass re-colonization in the latter half of the study period, and mean seagrass coverage of deposits had reached 48% approximately three years after dredging. Clovergrass Halophila engelmannii was the initial colonist, but shoalgrass Halodule wrightii predominated after about one year. Densities of annelids and non-decapod crustaceans were generally significantly greater in close and distant seagrass habitats than in dredged material habitat, whereas densities of molluscs were not significantly related to habitat type. Nekton (fish and decapod) densities were almost always significantly greater in the two seagrass habitats than in dredged material deposits. Benthos and nekton communities in dredged material deposits were distinct from those in seagrass habitats. Recovery from dredged material placement was nearly complete for water column and sediment components after 1.5 to 3 years, but recovery of seagrasses, benthos, and nekton was predicted to take 4 to 8 years. The current 2 to 5 years dredging cycle virtually insures no time for ecosystem recovery before being disturbed again. The only way to ensure permanent protection of the high primary and secondary productivity of seagrass beds in Laguna Madre from acute and chronic effects of maintenance dredging, while ensuring

  19. Tier 1 ecological evaluation of proposed discharge of dredged material from Oakland Harbor into ocean waters

    Energy Technology Data Exchange (ETDEWEB)

    Shreffler, D.K.; Thorn, R.M.; Walls, B.E.; Word, J.Q. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1994-01-01

    The Water Resources Development Act of 1986 (Public Law 99--662) authorized the U.S. Army Corps of Engineers (USACE) -- San Francisco District, to accommodate larger, deeper draft vessels in Oakland inner and Outer Harbors by deepening and widening the existing navigation channel, and providing turning basins and maneuvering areas in Oakland inner Harbor. The suitability of the resulting dredged material for disposal into ocean waters was subject to the procedures of the 1991 Testing Manual, Evaluation of Dredged Material Proposed for Ocean Disposal, known as the ``Green Book``. The Green Book provides a tiered approach for testing the suitability of dredged materials through chemical, physical, and biological evaluations. The first level of investigation, or Tier 1 evaluation, is used to determine whether a decision on LPC compliance can be made on the basis of readily available information. The Tier 1 report primarily summarizes existing information on sediment contamination and toxicity potential, identifies contaminants of concern, and determines the need for further testing. To assist the USACE in determining the suitability of dredged material from Oakland inner and Outer Harbors for ocean disposal, Battelle/Marine Sciences Laboratory prepared this Tier 1 report based upon information and data provided by USACE. Because this Tier 1 report originated well after an LPC determination was made to require testing of project sediments in Tier 3, the primary purpose of this report was to identify contaminants of concern (if any) in that particular dredged material. In addition, this Tier 1 report summarizes available information on chemical, physical, and biological characterization of the sediments in Oakland inner and Outer Harbors.

  20. Etiology, Diagnosis, and Management of Failed SLAP Repair.

    Science.gov (United States)

    Werner, Brian C; Brockmeier, Stephen F; Miller, Mark D

    2014-09-01

    In general, favorable outcomes have been achieved with arthroscopic repair of superior labral anterior-posterior (SLAP) tears. However, some patients remain dissatisfied or suffer further injury after SLAP repair and may seek additional treatment to alleviate their symptoms. The cause of persistent pain or recurrent symptoms after repair is likely multifactorial; therefore, careful preoperative workup is required to elucidate the cause of pain. Review of the details of previous surgical procedures is crucial because certain fixation methods are prone to failure or can cause additional injury. Failed SLAP repair can be managed with nonsurgical or surgical options. Nonsurgical modalities include physical therapy and strengthening programs, anti-inflammatory agents, and activity modification. Surgical options include revision SLAP repair and biceps tenotomy or tenodesis with or without revision SLAP repair. Outcomes after surgical management of failed SLAP repair are inferior to those of primary repair. Select patients may be better served by primary biceps tenodesis rather than SLAP repair.

  1. Treatment and Controversies in Paraesophageal Hernia Repair

    Directory of Open Access Journals (Sweden)

    P. Marco eFisichella

    2015-04-01

    Full Text Available Background: Historically all paraesophageal hernias were repaired surgically, today intervention is reserved for symptomatic paraesophageal hernias. In this review, we describe the indications for repair and explore the controversies in paraesophageal hernia repair, which include a comparison of open to laparoscopic paraesophageal hernia repair, the necessity of complete sac excision, the routine performance of fundoplication, and the use of mesh for hernia repair.Methods: We searched Pubmed for papers published between 1980 and 2015 using the following keywords: hiatal hernias, paraesophageal hernias, regurgitation, dysphagia, gastroesophageal reflux disease, aspiration, GERD, endoscopy, manometry, pH monitoring, proton pump inhibitors, anemia, iron deficiency anemia, Nissen fundoplication, sac excision, mesh, mesh repair. Results: Indications for paraesophageal hernia repair have changed, and currently symptomatic paraesophageal hernias are recommended for repair. In addition, it is important not to overlook iron-deficiency anemia and pulmonary complaints, which tend to improve with repair. Current practice favors a laparoscopic approach, complete sac excision, primary crural repair with or without use of mesh, and a routine fundoplication.

  2. Ecological evaluation of proposed discharge of dredged material from Oakland Harbor into ocean waters (Phase 3 A of -42-foot project)

    Energy Technology Data Exchange (ETDEWEB)

    Ward, J A; Word, J Q; Pinza, M R; Mayhew, H L; Barrows, E S; Lefkovitz, L F [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1992-09-01

    The Battelle/Marine Sciences Laboratory (MSL) conducted a study to determine whether dredged sediments from Oakland Inner and Outer Harbors were suitable for ocean disposal. Nineteen test treatments, six reference treatments, and three control treatments were tested for physical/chemical parameters, water column effects, dredged- sediment toxicity, and bioaccumulation potential. Physical/chemical parameters were analyzed at each site and each composite sediment to a depth of -44 ft MLLW. These parameters included analysis for geological characteristics, conventional sediment measurements (grain size, total volatile solids, total organic carbon, oil and grease, and total petroleum hydrocarbons), metals,, polynuclear aromatic hydrocarbons (PAHs), pesticides, butyltins, and polychlorinated biphenyls (PCBs). Physical/chemical data were used in support of the toxicological and bioaccumulation testing, but were not used in the decision-making criteria described in the Draft Implementation manual under Tier III testing. To evaluate water column effects, MSL conducted suspended-particulate-phase (SPP) test using the mysid shrimp Holmesimysis sculpta, speckled sanddab citharichtys stigmaeus, and larvae of the pacific oyster Crassostrea gigas. Both a 48-h and a 96-h test were performed. The MSL evaluated dredged-sediment toxicity by conducting a total of eight solid-phase toxicity tests using the following organisms: the bivalve clam Macoma nasuta, the polychaete worm Nepthys caecoides, the speckled sanddab C. stigmaeus, and the amphipod Rhepoxynius abronius. Test duration ranged from 10 to 28 days. Bioaccumulation potential was evaluated in the 28-day M. Nasuta and N. caecoides solid-phase exposures by measuring the contaminants of concern present in their tissues after exposure to test, reference, and control sediments. This report contains the data and test results.

  3. MAINTAINING ACCESS TO AMERICA'S INTERMODAL PORTS/TECHNOLOGIES FOR DECONTAMINATION OF DREDGED SEDIMENT: NEW YORK/NEW JERSEY HARBOR

    Energy Technology Data Exchange (ETDEWEB)

    STERN,E.A.; JONES,K.; DONATO,K.; PAULING,J.D.; SONTAG,J.G.; CLESCERI,N.L.; MENSINGER,M.C.; WILDE,C.L.

    1998-05-01

    One of the greatest drivers for maintaining access to America's Intermodal ports and related infrastructure redevelopment efforts over the next several years will be the control and treatment of contaminated sediments dredged from the nation's waterways. More than 306 million cubic meters (m{sup 3}) (400 million cubic yards [cy]) of sediments are dredged annually from US waterways, and each year close to 46 million m{sup 3} (60 million cy) of this material is disposed of in the ocean (EPA 842-F-96-003). The need to protect the environment against undesirable effects from sediment dredging and disposal practices is gaining increased attention from the public and governmental agencies. Meeting this need is a challenging task not only from the standpoint of solving formidable scientific and engineering problems, but also, and more importantly, from the need to implement complex collaborations among the many different parties concerned with the problem. Some 40 years ago, C.P. Snow pointed out the problems involved in communicating between the two cultures of the sciences and the humanities (Snow, 1993). Today, it is necessary to extend Snow's concept to a multicultural realm with groups that include governmental, industrial, environmental, academic, and the general public communicating in different languages based on widely different fundamental assumptions. The handling of contaminated sediments in the Port of New York/New Jersey (Port) exemplifies this problem. This paper describes a multicultural team that has formed as the result of a Congressional mandate for the development of procedures suitable for the decontamination of sediments in the Port under the Water Resources Development Act (WRDA) of 1992 (Section 405C) and 1996 (Section 226).

  4. Dorsal variant blister aneurysm repair.

    Science.gov (United States)

    Couldwell, William T; Chamoun, Roukoz

    2012-01-01

    Dorsal variant proximal carotid blister aneurysms are treacherous lesions to manage. It is important to recognize this variant on preoperative angiographic imaging, in anticipation of surgical strategies for their treatment. Strategies include trapping the involved segment and revascularization if necessary. Other options include repair of the aneurysm rupture site directly. Given that these are not true berry aneurysms, repair of the rupture site involves wrapping or clip-grafting techniques. The case presented here was a young woman with a subarachnoid hemorrhage from a ruptured dorsal variant blister aneurysm. The technique used is demonstrated in the video and is a modified clip-wrap technique using woven polyester graft material. The patient was given aspirin preoperatively as preparation for the clip-wrap technique. It is the authors' current protocol to attempt a direct repair with clip-wrapping and leaving artery sacrifice with or without bypass as a salvage therapy if direct repair is not possible. Assessment of vessel patency after repair is performed by intraoperative Doppler and indocyanine green angiography. Intraoperative somatosensory and motor evoked potential monitoring is performed in all cases. The video can be found here: http://youtu.be/crUreWGQdGo.

  5. Contaminant accumulation and biomarker responses in caged mussels, Mytilus galloprovincialis, to evaluate bioavailability and toxicological effects of remobilized chemicals during dredging and disposal operations in harbour areas

    Energy Technology Data Exchange (ETDEWEB)

    Bocchetti, Raffaella; Fattorini, Daniele; Pisanelli, Barbara [Istituto di Biologia e Genetica, Universita Politecnica delle Marche, Via Ranieri Monte d' Ago, 60100 Ancona (Italy); Macchia, Simona; Oliviero, Lisa; Pilato, Fabiano; Pellegrini, David [Istituto Centrale per la Ricerca Scientifica e Tecnologica Applicata al Mare (ICRAM), Viale Nazario Sauro 4, 57128 Livorno (Italy); Regoli, Francesco [Istituto di Biologia e Genetica, Universita Politecnica delle Marche, Via Ranieri Monte d' Ago, 60100 Ancona (Italy)], E-mail: f.regoli@univpm.it

    2008-09-29

    Remobilization of chemicals from contaminated sediments is a major risk associated with dredging and disposal operations in harbour areas. In this work caged mussels, Mytilus galloprovincialis, were chosen as bioindicator organisms to reveal the impact and recovery of organisms from these activities in the harbour of Piombino (Tuscany, Italy) where approximately 100,000 m{sup 3} of sediments were removed and disposed in a local confined disposal facility (CDF). Organisms were deployed before, during and after the end of operations, selecting sites differently impacted by these activities. Temporal changes in environmental bioavailability and biological effects of pollutants were assessed by integrating analyses of trace metals and polycyclic aromatic hydrocarbons (PAHs) accumulated in tissues of caged mussels with a wide array of biomarkers reflecting exposure to specific classes of pollutants and different levels of cellular unbalance or toxicity. Such biological responses included levels of metallothioneins, activity of acyl CoA oxidase (AOX) as a marker of peroxisome proliferation, oxidative stress biomarkers (content of glutathione, enzymatic activities of catalase, glutathione S-transferases, glutathione reductase, glutathione peroxidases), total oxyradical scavenging capacity (TOSC) toward peroxyl and hydroxyl radicals, lysosomal membrane stability and genotoxic effects measured as DNA strand breaks and frequency of micronuclei. Obtained results indicated that a general disturbance was already present in the whole harbour area and especially in the inner site before the beginning of operations, when caged mussels exhibited a significant accumulation of PAHs and Pb, lower TOSC values and higher levels of both lysosomal and genotoxic damages. Bioavailability of trace metals and PAHs markedly increased during dredging activities with values up to 40 {mu}g/g for Pb and up to 2200 ng/g for PAHs in tissues of caged mussels, a significant inhibition of antioxidant

  6. Laboratory Assessment of Potential Impacts to Dungeness Crabs from Disposal of Dredged Material from the Columbia River

    Energy Technology Data Exchange (ETDEWEB)

    Vavrinec, John; Pearson, Walter H.; Kohn, Nancy P.; Skalski, J. R.; Lee, Cheegwan; Hall, Kathleen D.; Romano, Brett A.; Miller, Martin C.; Khangaonkar, Tarang P.

    2007-05-07

    Dredging of the Columbia River navigation channel has raised concerns about dredging-related impacts on Dungeness crabs (Cancer magister) in the estuary, mouth of the estuary, and nearshore ocean areas adjacent to the Columbia River. The Portland District, U.S. Army Corps of Engineers engaged the Marine Sciences Laboratory (MSL) of the U.S. Department of Energy’s Pacific Northwest National Laboratory to review the state of knowledge and conduct studies concerning impacts on Dungeness crabs resulting from disposal during the Columbia River Channel Improvement Project and annual maintenance dredging in the mouth of the Columbia River. The present study concerns potential effects on Dungeness crabs from dredged material disposal specific to the mouth of the Columbia River.

  7. Annual Reports Regarding Progress in Developing a Dredged Material Management Plan for the Long Island Sound Region

    Science.gov (United States)

    The site designation for the Western and Central Long Island Sound disposal sites requires the completion of a Dredged Material Management Plan (DMMP) and EPA to conduct an annual review of progress toward completion of the DMMP.

  8. Contact Dermatitis In Automobile Repair workers

    Directory of Open Access Journals (Sweden)

    Joshi M P

    1997-01-01

    Full Text Available Automobile repair workers are at risk of developing skin morbidity including occupational dermatoses because of their exposure to mineral oils, petroleum products and its derivatives and lubricating oil. This cross- sectional study was carried out at Maharashtra State Road Transport Corporation workshops in Nagpur city to investigate prevalence of skin morbidity including contact dermatitis in automobile repair workers. The study included 288 (49.9% automobile repair workers 180 (31.3% workshop office staff and 109 (18.8% divisional office employees. Dermatitis was the commonest skin morbidity in all the study subjects and it was significantly more prevalent in automobile repair workers. Folliculitis was detected in 13.2% of auto â€" repair workers and was not seen in the other two groups. Increasing trend of skin morbidity was correlated with the length of service of employees. Proper protective measures along with suitable washing facilities should be provided

  9. Thoraco-abdominal aortic aneurysm branched repair

    NARCIS (Netherlands)

    Verhoeven, E. L. G.; Tielliu, I. F. J.; Ferreira, M.; Zipfel, B.; Adam, D. J.

    2010-01-01

    Open thoraco-abdominal aortic aneurysm repair is a demanding procedure with high impact on the patient and the operating team. Results from expert centres show mortality rates between 3-21%, with extensive morbidity including renal failure and paraplegia. Endovascular repair of abdominal aortic aneu

  10. Pectus excavatum repair

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/article/002949.htm Pectus excavatum repair To use the sharing features on this page, please enable JavaScript. Pectus excavatum repair is surgery to correct pectus excavatum . This ...

  11. Effects of sludge dredging on the prevention and control of algae-caused black bloom in Taihu Lake, China

    Institute of Scientific and Technical Information of China (English)

    Wei He; Jingge Shang; Xin Lu; Chengxin Fan

    2013-01-01

    Algae-caused black bloom (also known as black water agglomerate) has recently become a critical problem in some Ctinese lakes.It has been suggested that the occurrence of algae-caused black bloom was caused by the cooperation of nutrient-rich sediment with dead algae,and sludge dredging was adopted to control black bloom in some lakes of China.In this article,based on the simulation of black bloom using a Y-shape apparatus for modeling natural conditions,both un-dredged and dredged sites in three areas of Taihu Lake,China were studied to estimate the effects of dredging on the prevention and control of black bloom.During the experiment,drained algae were added to all six sites as an additional organic load; subsequently,the dissolved oxygen decreased rapidly,dropping to 0 mg/L at the sediment-water interface.Black bloom did not occur in the dredged sites of Moon Bay and Nan Quan,whereas all three un-dredged sites at Fudu Port,Moon Bay and Nan Quan experienced black bloom.Black bloom also occurred at the dredged site of Fudu Port one day later than at the other sites,and the odor and color were lighter than at the other locations.The color and odor of the black water mainly result from the presence of sulfides such as metal sulfides and hydrogen sulfide,among other chemicals,under reductive conditions.The color and odor of the water,together with the high concentrations of nutrients,were mainly caused by the decomposition of the algae and the presence of nutrient-rich sediment.Overall,the removal of the nutrient-rich sediment by dredging can prevent the occurrence and control the degree of algae-caused black bloom in Taihu Lake.

  12. Evaluation of Repair Tension in Arthroscopic Rotator Cuff Repair: Does It Really Matter to the Integrity of the Rotator Cuff?

    Science.gov (United States)

    Kim, Do Hoon; Jang, Young Hoon; Choi, Young Eun; Lee, Hwa-Ryeong; Kim, Sae Hoon

    2016-11-01

    Repair tension of a torn rotator cuff can affect healing after repair. However, a measurement of the actual tension during arthroscopic rotator cuff repair is not feasible. The relationship between repair tension and healing of a rotator cuff repair remains unclear. The purpose of this study was to evaluate the effect of repair tension on healing at the repair site. The hypothesis was that repair tension would be a major factor in determining the anatomic outcome of rotator cuff repair. Cohort study; Level of evidence, 2. Arthroscopic rotator cuff repairs (132 patients) for full-thickness rotator cuff tears were analyzed. An intraoperative model was designed for the estimation of repair tension using a tensiometer. Magnetic resonance imaging (MRI) was performed approximately 1 year (mean [±SD], 12.7 ± 3.2 months) postoperatively for the evaluation of healing at the repair site. Multivariable analysis was performed for tear size, amount of retraction, and fatty degeneration (FD) of rotator cuff muscles. The mean repair tension measured during the arthroscopic procedure was 28.5 ± 23.1 N. There was a statistically significant correlation between tension and tear size (Pearson correlation coefficient [PCC], 0.529; P rotator cuff muscles were included for multivariable logistic regression analysis, only FD of the infraspinatus showed an association with the anatomic outcome of repair (Exp(B) = 0.596; P = .010). Our intraoperative model for the estimation of rotator cuff repair tension showed an inverse correlation of repair tension with healing at the repair site, suggesting that complete healing is less likely with high-tension repairs. A significant association was observed on MRI between a high level of FD of the infraspinatus and repaired tendon integrity. © 2016 The Author(s).

  13. Documenting Temporal Changes in Channel Geometry of the Buffalo RiverResulting from a Large-Scale Environmental Dredging Project

    Science.gov (United States)

    Singer, J.; Bajo, J. V.; Pfender, K.; Luther, B.

    2016-12-01

    The Buffalo River is classified as a Great Lakes Area of Concern due to loss of habitat, poor water quality, and contaminated bottom sediments. Much attention is being paid to restoring the environmental health of the river with the goal to address the environmental impairments and de-list the river. In support of this effort, an environmental dredging project taking place between 2011 and 2015 removed over 1 million cubic yards of highly contaminated sediment. To support this project, sounding surveys were conducted before, during, and after removal of sediment to determine the amount of sediment to be removed from different 'dredge cells' in the river. These digital data, available upon request from the United States Army Corps of Engineers and the United States Environmental Protection Agency, are being used to generate digital elevation models (DEMs) using ArcGIS 10.3.1. The DEMs are compared to show channel topography and generate cross sectional profiles. Findings show channel deepening of several meters along with channel widening >10m in some dredged portions of the river. Other areas show decrease in depth and suggest local slumping and redeposition of dredged sediment. The sounding data available throughout the stages of the environmental dredging project support an improved understanding of the temporal changes to Buffalo River's channel resulting from the dredging project. The findings also advance our fundamental understanding about the response by rivers to channel modifications.

  14. 皎口水库清淤方案设计%The dredging design scheme of Jiaokou reservoir

    Institute of Scientific and Technical Information of China (English)

    郭晓晶

    2014-01-01

    This paper discussed the necessity of Jiaokou reservoir dredging and the define principle of dredging area,through the dredging equip-ment selection,selected the cutter suction dredger and bucket dredge as Jiaokou reservoir dredging equipment,the practice proved that:using the equipment for dredging reservoir,not only increased the reservoir storage capacity,also achieved good economic and social benefits.%论述了皎口水库清淤的必要性以及清淤区域界定的原则,通过清淤设备比选,选定绞吸式挖泥船及铲斗式挖泥船作为皎口水库清淤设备,实践证明:采用该设备进行水库清淤,不仅增加了水库库容,而且取得了较好的经济和社会效益。

  15. Impact of remobilized contaminants in Mytilus edulis during dredging operations in a harbour area: bioaccumulation and biomarker responses.

    Science.gov (United States)

    Martins, Marta; Costa, Pedro M; Raimundo, Joana; Vale, Carlos; Ferreira, Ana M; Costa, Maria H

    2012-11-01

    Dredging operations in harbours are recurrent to maintain accessibility and navigational depths. One of the main environmental risks of these operations is the remobilization of contaminants trapped in the sediments, rendering them more bioavailable to the biota. However, regulatory policies regarding the contamination risk of dredging chiefly apply to the disposal of dredged materials rather than the direct impact of the procedure itself. In order to assess the ecotoxicological risk of harbour dredging operations in a polluted estuary (the Tagus, W Portugal), the present study compared bioaccumulation and biomarker responses in field-deployed mussels before and after the beginning of operations, complemented by sediment characterization and risk analysis based on standardized sediment quality guidelines. The results revealed a very significant increase in genotoxicity and oxidative stress from the beginning of dredging onwards, which was accompanied by increased bioaccumulation of toxicants, especially polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs). Overall, the results indicate the importance of surveying the direct impacts of these procedures on local contamination, especially considering these sediments had been previously classified as "trace contaminated", according to normative guidelines, and therefore safe for disposal. This study shows the importance of obtaining both chemical and biological data in standard monitoring procedures and that the remobilization of contaminants by dredging operations may be grossly underestimated, which calls for caution when assessing the impact of these activities even in low to moderately polluted areas. Copyright © 2012 Elsevier Inc. All rights reserved.

  16. Complex networks repair strategies: Dynamic models

    Science.gov (United States)

    Fu, Chaoqi; Wang, Ying; Gao, Yangjun; Wang, Xiaoyang

    2017-09-01

    Network repair strategies are tactical methods that restore the efficiency of damaged networks; however, unreasonable repair strategies not only waste resources, they are also ineffective for network recovery. Most extant research on network repair focuses on static networks, but results and findings on static networks cannot be applied to evolutionary dynamic networks because, in dynamic models, complex network repair has completely different characteristics. For instance, repaired nodes face more severe challenges, and require strategic repair methods in order to have a significant effect. In this study, we propose the Shell Repair Strategy (SRS) to minimize the risk of secondary node failures due to the cascading effect. Our proposed method includes the identification of a set of vital nodes that have a significant impact on network repair and defense. Our identification of these vital nodes reduces the number of switching nodes that face the risk of secondary failures during the dynamic repair process. This is positively correlated with the size of the average degree and enhances network invulnerability.

  17. When "Other" Initiate Repair.

    Science.gov (United States)

    Schegloff, Emanuel A.

    2000-01-01

    Elaborates on the locus of other-initiated repair, and reports on a number of environments in which others initiate repair turns later than the one directly following the trouble-source turn. Describes several ways that other initiation of repair, which occurs in next-turn position, may be delayed within that position. (Author/VWL)

  18. Flotation as a remediation technique for heavily polluted dredged material. 1. A feasibility study.

    Science.gov (United States)

    Cauwenberg, P; Verdonckt, F; Maes, A

    1998-01-19

    The flotation behaviour of highly polluted dredged material was investigated at different pH values by mechanical agitated (Denver) flotation. Up to 80% of cadmium, copper, lead and zinc could be concentrated in the froth layer which represented only 30% of the total mass. The maximum specificity for heavy metals, defined as the concentrating factor, was obtained at pH 8-9. The maximum recovery of heavy metals on the other hand was found to be reached at elevated pH values (pH 12). In addition the specificity of the flotation process for the transition metals could be assigned to their presence as metal sulphides in the dredged material. However, the interaction with organic matter is an important factor in determining their flotability. The carbonate fraction was irrelevant for the flotation behaviour of heavy metals.

  19. Metal availability in a highly contaminated, dredged-sediment disposal site: Field measurements and geochemical modeling

    Energy Technology Data Exchange (ETDEWEB)

    Lions, Julie, E-mail: j.lions@brgm.f [BRGM, 3 Avenue Claude Guillemin, 45060 Orleans Cedex 2 (France); Centre National de Recherche sur les Sites et Sols Pollues, BP 537, 59505 Douai cedex (France); Guerin, Valerie; Bataillard, Philippe [BRGM, 3 Avenue Claude Guillemin, 45060 Orleans Cedex 2 (France); Centre National de Recherche sur les Sites et Sols Pollues, BP 537, 59505 Douai cedex (France); Lee, Jan van der [Mines ParisTech, Centre de Geosciences, 77305 Fontainebleau Cedex (France); Laboudigue, Agnes [Univ Lille Nord de France, F-59000 Lille (France); EMDouai, MPE-GCE, F-59500 Douai (France); Centre National de Recherche sur les Sites et Sols Pollues, BP 537, 59505 Douai cedex (France)

    2010-09-15

    Two complementary approaches were used to characterize arsenic and metal mobilizations from a dredged-sediment disposal site: a detailed field study combined with hydrogeochemical modeling. Contaminants in sediments were found to be mainly present as sulfides subject to oxidation. Secondary phases (carbonates, sulfates, (hydr)oxides) were also observed. Oxidative processes occurred at different rates depending on physicochemical conditions and contaminant contents in the sediment. Two distinct areas were identified on the site, each corresponding to a specific contaminant mobility behavior. In a reducing area, Fe and As were highly soluble and illustrated anoxic behavior. In well-oxygenated material, groundwater was highly contaminated in Zn, Cd and Pb. A third zone in which sediments and groundwater were less contaminated was also characterized. This study enabled us to prioritize remediation work, which should aim to limit infiltration and long-term environmental impact. - A detailed case study of metal behavior in a dredged-sediment disposal site combined with geochemical modeling.

  20. Comparison of Remolded Shear Strength with Intrinsic Strength Line for Dredged Deposits

    Institute of Scientific and Technical Information of China (English)

    DENG Dong-sheng

    2007-01-01

    Chandler proposed the intrinsic strength line to correlate the undrained shear strength of samples one-dimensionally consolidated from slurry with the void index proposed by Burland. The undrained shear strength on the intrinsic strength line is different from the remolded undrained shear strength that is an important parameter for design and construction of land reclamation. The void index is used in this study for normalizing the remolded strength behavior of dredged deposits. A quantitative relationship between remolded undrained shear strength and void index is established based on extensive data of dredged deposits available from sources of literature. Furthermore, the normalized remolded undrained shear strength is compared with intrinsic strength line. The comparison result indicates that the ratio of undrained shear strength on the intrinsic strength line over remolded undrained shear strength increases with an increase in applied consolidated stress.

  1. Small Crater Expedient Repair Test.

    Science.gov (United States)

    1980-08-01

    Force Base, New Mexico , October 1975. 3. Rollings, Raymond S., Laboratory Evaluation of Expedient Pavement Repair Materials, CEEDO-TR-7-44, Civil and...blank) APPENDIX A EQUIPMENT PERFORMANCE SP6WCIFICATIONS Performance specit’ications are included i.n tl is appe udi \\ tor the following equipment: 1

  2. Databases and Bioinformatics Tools for the Study of DNA Repair

    Directory of Open Access Journals (Sweden)

    Kaja Milanowska

    2011-01-01

    Full Text Available DNA is continuously exposed to many different damaging agents such as environmental chemicals, UV light, ionizing radiation, and reactive cellular metabolites. DNA lesions can result in different phenotypical consequences ranging from a number of diseases, including cancer, to cellular malfunction, cell death, or aging. To counteract the deleterious effects of DNA damage, cells have developed various repair systems, including biochemical pathways responsible for the removal of single-strand lesions such as base excision repair (BER and nucleotide excision repair (NER or specialized polymerases temporarily taking over lesion-arrested DNA polymerases during the S phase in translesion synthesis (TLS. There are also other mechanisms of DNA repair such as homologous recombination repair (HRR, nonhomologous end-joining repair (NHEJ, or DNA damage response system (DDR. This paper reviews bioinformatics resources specialized in disseminating information about DNA repair pathways, proteins involved in repair mechanisms, damaging agents, and DNA lesions.

  3. Reducing risks of maintenance dredging on freshwater mussels (Unionidae) in the Big Sunflower River, Mississippi.

    Science.gov (United States)

    Miller, Andrew C; Payne, Barry S

    2004-11-01

    In response to proposed dredging in a 122-km reach of the Big Sunflower River, Mississippi, we studied freshwater mussels (family: Unionidae) using qualitative, semi-quantitative, and quantitative (0.25 m(2) total substratum removal) methods in 1987, 1993, 1994, 2001, 2002, and 2003. Our objectives were to identify important mussel resources, to devise methods for minimizing dredging risks, and to identify habitat improvement features. Approximately 60% of the fauna was located on two high-density shoals characterized by extreme dominance of the commercially valuable threeridge (Amblema plicata). Shallow nearshore and main channel areas comprised approximately 10 and 88% of the aquatic habitat in the project area; however, these areas were of less importance for mussels and supported densities of approximately 5 and 0.5 individuals/m(2), respectively. Throughout the project area the mussel fauna exhibited little or no evidence of recent recruitment, dominance of relatively few species (either A. plicata, or the bank climber Plectomerus dombeyanus), and low species diversity (H') and evenness. No federally listed endangered or threatened mussels were found, although the pyramid pigtoe (Pleurobema pyramidatum), a species listed as endangered in Mississippi, was collected in and upstream of the project area. Two other state-listed species, Plethobasus cyphyus (sheepnose) and Quadrula cylindrica (rabbitsfoot), were only found on gravelly shoals upriver of the project area. Maintenance plans were redesigned to minimize environmental damage; a hydraulic cutterhead dredge will be used in most of the mainstem to reduce risk to nearshore habitats. High-density assemblages on four shoals will not be dredged and 150 and 100 m buffer zones will be left immediately up and downriver. Enhancements for aquatic biota will be created with gravel substratum and wing dams.

  4. Dredged Material Placement Site Capacity Analysis for Navigation Improvement Project at Grays Harbor, WA

    Science.gov (United States)

    2012-09-01

    the bed, but also the overlying water resulting from underfilled buckets . The entrainment of water or bulking of the sediment is often described by a...that of the bucket down to smaller, sand or gravel sized bed fragments. It is difficult to measure, estimate, or describe these clumps, but they...Size and settling velocities of cohesive flocs and suspended sediment aggregates in a trailing suction hopper dredge plume. Continental Shelf Research

  5. Sustainable Confined Disposal Facilities for Long-term Management of Dredged Material

    Science.gov (United States)

    2010-07-01

    Availability of adjacent lands may limit lateral expansion and foundation stability may limit vertical expansion. ERDC TN-DOER-D10 July 2010...cofferdams and vertical sheet pile retaining wall structures and soil-cement mixing. Managing to Minimize In-CDF Volume. When sediments are removed...580, 106 Stat. 4797, 33 U.S.C. 2201 et seq. 4. Agriculture, Forestry, Horticulture , and Aquaculture: Using dredged material to replace eroded

  6. 14 CFR 145.209 - Repair station manual contents.

    Science.gov (United States)

    2010-01-01

    ... 14 Aeronautics and Space 3 2010-01-01 2010-01-01 false Repair station manual contents. 145.209... manual contents. A certificated repair station's manual must include the following: (a) An organizational... for revising the repair station's manual and notifying its certificate holding district office...

  7. Comparing the Thixotropic and Lightly Solidified Hardening Behavior of a Dredged Marine Clay

    Directory of Open Access Journals (Sweden)

    C. M. Chan

    2014-10-01

    Full Text Available When a soil is disturbed upon remolding, it may lose part or all of its strength. As time passes, the structural arrangement of the soil particles would be restored to a stable form and the soil would regain hardness under constant volume and water content. The process is known as “thixotropic hardening”. On another note, dredged marine soils of the fine-grained type can be reused as a backfill material instead of being disposed to the open sea. The rest period required for the relocated soil to regain strength and stiffness, i.e. thixotropic hardening, needs to be estimated precisely. For this purpose, a study on the phenomena of strength and stiffness gain by a dredged marine clay was carried out. The strength and stiffness improvement with time was measured using the vane shear and fall cone tests respectively. The clay was remolded at different water contents in multiples of the soil’s liquid limit (LL, namely 0.75LL, 1.00LL and 1.25LL, in order to evaluate the effect of initial water content on thixotropic hardening. A separate series of samples were prepared with light solidification using cement, to examine the possibilities of enhancing the soil’s improvement in a shorter rest period. The results showed the dredged marine clay can potentially be used as a backfill material for reclamation works, with lower initial water content and light solidification contributing to accelerated better performance

  8. Short-term response of subadult white sturgeon to hopper dredge disposal operations

    Science.gov (United States)

    Parsley, Michael J.; Popoff, Nicholas D.; Romine, Jason G.

    2011-01-01

    The effect of dredged-material disposal operations on the behavior of seven white sturgeon Acipenser transmontanus (50–101 cm fork length) was examined by analysis of the movements and depth use of these fish before, during, and after a series of hopper dredge disposal operations in the lower Columbia River. Analyses of fish locations showed that 12 flow-lane disposal operations within a 24-h period had minimal effect on subadult white sturgeon behavior; six of the seven fish showed slight attraction to the disposal area during disposals, and one fish increased its distance from the disposal area. The core area for all fish combined shifted toward the disposal area during disposals. In the 24 h after completion of the disposal operations the fish core areas shifted back toward those areas occupied before the disposals. The rates of movement, depths used, and diel movement patterns of the white sturgeon showed little change over all periods, suggesting that natural behaviors were not altered during and immediately after hopper dredge disposal operations.

  9. Distribution and abundance of Dungeness crab and crangon shrimp, and dredging-related mortality of invertebrates and fish in Grays Harbor, Washington

    OpenAIRE

    David A Armstrong; Stevens, Bradley G.; Hoeman, James C.

    1981-01-01

    The impacts of widening and deepening the existing navigation channel in Grays Harbor on Dungeness crab, crangon shrimp and fish was investigated. The spatial and temporal distribution of these organisms was studied using an otter trawl and ring nets, and the uptake of organisms by dredges was estimated from samples collected on working hopper and pipeline dredges. ... Impacts of the dredging project on crabs, shrimp and fish could be associated with entrainment, food loss and toxicants relea...

  10. Failure strengths of repair devices versus meniscus suturing techniques

    OpenAIRE

    Asik, Mehmet; Sener, Nadir; Dikici, Fatih; Sen, Cengiz

    2004-01-01

    Objectives: The purpose of this study was to compare the load to failure of different common suturing techniques with that of repair devices. Methods: Seventy-one calf medial menisci were cut to simulate peripheral longitudinal tears and repaired using either one of the two suture techniques or one of the seven repair devices. Then the two parts of the meniscus were pulled using an Instron tensometer until failure occurred. The techniques and repair devices tested included vertical (0 PDS,...

  11. Environment-friendly Dredging with Geotextile Tubes for Dewatering and Volume Reduction of Sediments in Lake and Reservoir%环保疏浚联合土工管袋用于湖库底泥的脱水减容

    Institute of Scientific and Technical Information of China (English)

    王松; 魏新庆; 王立彤

    2011-01-01

    The engineering case of using environment-friendly dredging with geotextile tubes for dredging, dewatering and volume reduction of sediments in Hangu Sewage Reservoir is introduced. It mainly includes design of environment-friendly dredging, preparation of dewatering and volume reduction site, selection of the geotextile tubes, filling of geotextile tubes, dosing of the flocculant and so on.Through the design and whole process practice of this engineering, the design parameters and process of environment-friendly dredging with geotextile tubes for dewatering and volume reduction of sediments in lake and reservoir are found to lay the foundation for its large-scale application in the future.%介绍了汉沽污水库现场试验工程采用环保疏浚联合土工管袋的方式,对底泥进行清淤和脱水减容的工程实例,主要内容包括环保疏浚设计、脱水减容场地准备、土工管袋选型、土工管袋充填、絮凝剂投加等.通过对本工程的设计和全过程跟踪实践,摸索出环保疏浚联合土工管袋用于湖库底泥脱水减容的设计参数和操作流程,为今后规模化应用奠定了基础.

  12. Research Progresses of Environmental Dredging Engineering Project for River Sediments%河道底泥环保疏浚研究进展

    Institute of Scientific and Technical Information of China (English)

    张丹; 张勇; 何岩; 黄民生; 刘俊华

    2011-01-01

    With the increasing of environmental dredging projects, the environmental sediment dredging becomes a worldwide concern. Sediment dredging can effectively reduce the contents of nutrient, heavy metals and persistent organic pollutants in sediment.The effectiveness of sediment dredging on water pollution control is usually time-limited. The methods of dredging, the depth of dredging and equipments of dredging should be considered when dredging is designed. Many references at home and abroad are cited to improve the understanding about environmental sediment dredging.%随着环保疏浚项目的增多,河道底泥环保疏浚已成为了世界关注的问题.疏浚对沉积物中的营养物、重金属和持久性有机物等污染物的去除明显.底泥环保疏浚对河道污染控制具有时效性,疏浚方式、疏浚深度和疏浚设备是疏浚工程方案设计所需参考的主要因素.该文旨在通过对国内外底泥环保疏浚研究进展的文献进行综述,以期加深对底泥环保疏浚的认识.

  13. Effect of deanxit and dredging psychotherapy on neuroses%黛力新及心理疏导疗法对神经症的治疗研究

    Institute of Scientific and Technical Information of China (English)

    魏建科; 郭克锋

    2002-01-01

    Objective To explore the effects of deanxit and dredging psychotherpay on patients with neurosis.Method The therapeutic efficacy of deanxit and dredging psychotherapy on neuroses was observed.The diagnosis was bases on CCMD-2-R.The classification diagnosis and efficacy determination indexes were SCL-90.Result The therapeutic effect of deanxit and dredging psychotherapy on neuroses was significantly higher than that of each therapeutics,and every SCL-90 score was also much lower.Conclusion Neuroses is a mental disorder,so drug treatment combined with dredging psychotherpay is very important.

  14. Transvesicoscopic Repair of Vesicovaginal Fistula

    Directory of Open Access Journals (Sweden)

    R. B. Nerli

    2010-01-01

    Full Text Available Introduction. Vesicovaginal fistula has been a social and surgical problem for centuries. Many surgical techniques have been developed to correct this abnormality, including transabdominal, transvaginal, and endoscopic approaches. The best approach is probably the one with which the surgeon feels most experienced and comfortable. Laparoscopy has become increasingly popular in urology, reducing the invasiveness of treatment and shortening the period of convalescence. We report our results of transvesicoscopic approach for VVF repair. Materials and Methods. Patients with VVF were offered repair using the transvesicoscopic route. With the patient under general anaesthesia and in modified lithotomy position cystoscopy was performed with gas insufflation. Under cystoscopic guidance the bladder was fixed to anterior abdominal wall and ports inserted into the bladder. The fistula was repaired under endoscopic vision. Results. Four women, who had VVF following abdominal hysterectomy, underwent this procedure. The operating time ranged from 175 to 235 minutes. There was minimal bleeding. Post operative complications included ileus in one and fever in another. No recurrence of VVF was noted in any patient. Conclusions. Transvesicoscopic repair of VVF is feasible, safe, and results in lower morbidity and quicker recovery time.

  15. Optimality in DNA repair.

    Science.gov (United States)

    Richard, Morgiane; Fryett, Matthew; Miller, Samantha; Booth, Ian; Grebogi, Celso; Moura, Alessandro

    2012-01-07

    DNA within cells is subject to damage from various sources. Organisms have evolved a number of mechanisms to repair DNA damage. The activity of repair enzymes carries its own risk, however, because the repair of two nearby lesions may lead to the breakup of DNA and result in cell death. We propose a mathematical theory of the damage and repair process in the important scenario where lesions are caused in bursts. We use this model to show that there is an optimum level of repair enzymes within cells which optimises the cell's response to damage. This optimal level is explained as the best trade-off between fast repair and a low probability of causing double-stranded breaks. We derive our results analytically and test them using stochastic simulations, and compare our predictions with current biological knowledge.

  16. Evaluation of dredged material proposed for ocean disposal from Red Hook/Bay Ridge project areas, New York

    Energy Technology Data Exchange (ETDEWEB)

    Pinza, M.R.; Barrows, E.S.; Borde, A.B. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1996-09-01

    The objective of the Red HookIBay Ridge project was to evaluate proposed dredged material from these two areas to determine its suitability for unconfined ocean disposal at the Mud Dump Site. Sediment samples were collected from the Red Hook/Bay Ridge project areas. Tests and analyses were conducted. The evaluation of proposed dredged material from the Red Hook/Bay Ridge project areas consisted of bulk sediment chemical analyses, chemical analyses of dredging site water and elutriate, water-column and benthic acute toxicity tests. Twenty-four individual sediment core samples were collected from these two areas and analyzed for grain size, moisture content, and total organic carbon (TOC). Three composite sediment samples, representing Red Hook Channel and the two Bay Ridge Reaches to be dredged, were analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAH), and 1,4-dichlorobenzene. Dredging site water and elutriate water, which is prepared from the suspended-particulate phase (SPP) of the three Red Hook Bay Ridge sediment composites, were analyzed for metals, pesticides, and PCBS. Benthic acute toxicity tests were performed. Water-column or SPP toxicity tests were performed. Bioaccumulation tests were also conducted.

  17. Distribution of chlorinated organic pollutants in harbor sediments of Livorno (Italy): a multivariate approach to evaluate dredging sediments.

    Science.gov (United States)

    Cicero, A M; Mecozzi, M; Morlino, R; Pellegrini, D; Veschetti, E

    2001-10-01

    Dredging is a very important procedure for harbor management. In Italy the guidelines for the offshore dumping of dredged materials are issued by the Ministry of Environment. They described a few steps of dredging activities, such as the sampling strategy, but do not deal with limits or guide-values for the chemical, physical and biological composition of the resulting sediments. The quality of dredged materials is mainly dependent on the presence of inorganic and organic pollutants. In particular, polychlorinated biphenyls (PCBs) and organo-chlorinated pesticides are seen as a high priority in marine environment by international organizations because of their persistence, toxicity and bioaccumulation capacity. In this article the presence of some PCBs and organo-chlorinated pesticides in sediment samples collected from the harbor of Livorno (Northern Tyrrhenian Sea) was investigated. The concentration of HCHs, Aldrin, Chlordanes, DDEs, DDTs, and PCBs in 12 representative sites ranged between <1 microg kg(-1) and 95, 19, 32, 35, 107, and 111 microg kg(-1), respectively. The application of univariate and multivariate statistical techniques, such as linear regression analysis and principal component analysis, to the experimental data showed a different distribution of PCBs in the two sediment layers. On the contrary, the vertical distribution of the other investigated pollutants was more homogeneous and affected by random variability. The multivariate approach was an important tool to establish more rational criteria for the management of dredged materials.

  18. Kinematic effect of MGHL incorporation into Bankart repair.

    Science.gov (United States)

    Garber, Alexander C; Argintar, Evan; Shin, Sang-Jin; McGarry, Michelle H; Tibone, James E; Lee, Thay Q

    2013-05-01

    Surgical treatment for traumatic shoulder instability has progressed in tandem with the evolution of the current understanding of the anatomy and biomechanics of the shoulder. Proponents of incorporating the middle glenohumeral ligament (MGHL) in Bankart repair believe this technique could increase repair strength. The purpose of this biomechanical study was to compare the range of motion and humeral head kinematic changes that result from including the MGHL in a Bankart repair in an effort to identify possible changes in shoulder biomechanics as a result of this addition in surgical repair.Six cadaveric shoulders were tested in 4 conditions: intact, Bankart lesion, repair excluding the MGHL, and repair including the MGHL. Each condition was tested for range of motion, glenohumeral translation, and humeral head apex position. Standard Bankart repair and repair with MGHL inclusion resulted in decreased range of motion, but no statistically significant difference was found between the 2 repair types (P=.846). Anterior translation was significantly reduced with both the Bankart repair (4.8 ± .9; P=.049) and included MGHL repair (4.6 ± 0.9; P=.029). No statistically significant difference was found between both repairs (P=.993). Although both repairs showed posterior displacement of the humeral head apex when in external rotation, this trend only reached statistical significance when compared with the Bankart lesion in 90° of external rotation (P=.0456); however, no significant difference was found between the 2 repairs (P=.999). Inclusion or exclusion of the MGHL in a Bankart repair does not significantly affect the range of motion, translation, or kinematics of the glenohumeral joint. Copyright 2013, SLACK Incorporated.

  19. Open preperitoneal groin hernia repair with mesh

    DEFF Research Database (Denmark)

    Andresen, Kristoffer; Rosenberg, Jacob

    2017-01-01

    A systematic review was conducted and reported according to the PRISMA statement. PubMed, Cochrane library and Embase were searched systematically. Studies were included if they provided clinical data with more than 30 days follow up following repair of an inguinal hernia with an open preperitoneal mesh......Background For the repair of inguinal hernias, several surgical methods have been presented where the purpose is to place a mesh in the preperitoneal plane through an open access. The aim of this systematic review was to describe preperitoneal repairs with emphasis on the technique. Data sources...

  20. Recycling biosolids and lake-dredged materials to pasture-based animal agriculture: Alternative nutrient sources for forage productivity and sustainability

    Science.gov (United States)

    Domestic sewage sludge or biosolids and lake-dredged materials are examples of materials that can be used to cut fertilizer costs in pasture-based animal agriculture. Sustainable biosolids and lake-dredged materials management is based upon controlling and influencing the quantity, quality and chara...

  1. 78 FR 77122 - Proposed Modification of a General NPDES Permit for Small Suction Dredging-Permit Number IDG-37-0000

    Science.gov (United States)

    2013-12-20

    ... From the Federal Register Online via the Government Publishing Office ENVIRONMENTAL PROTECTION AGENCY Proposed Modification of a General NPDES Permit for Small Suction Dredging--Permit Number IDG-37... Permit for placer mining operations in Idaho using small suction dredges (intake nozzle size of 5 inches...

  2. 77 FR 31725 - Safety Zone; Belle Pass Dredge Operations, Belle Pass, Mile Marker 1.0 to Mile Marker (−0.2...

    Science.gov (United States)

    2012-05-30

    ... SECURITY Coast Guard 33 CFR Part 165 RIN 1625-AA00 Safety Zone; Belle Pass Dredge Operations, Belle Pass... operations in specified waters of Belle Pass, Port Fourchon, Louisiana. This action is necessary for the... pipelines along the Gulf Shoreline of Belle Pass. In addition to the dredging equipment described...

  3. Coastal monitoring of the May 2005 dredge disposal offshore of Ocean Beach, San Francisco, Calif.

    Science.gov (United States)

    Barnard, Patrick L.; Hanes, Daniel M.

    2006-01-01

    Ocean Beach, California, contains an erosion hot spot in the shadow of the San Francisco ebb tidal delta south of Sloat Boulevard that threatens valuable public infrastructure as well as the safe recreational use of the beach. In an effort to reduce the erosion at this location and avoid hazardous navigation conditions at the current disposal site (SF-8), a new plan for the management of sediment dredged annually from the main shipping channel at the mouth of Francisco Bay was implemented in May 2005 by the United States Army Corps of Engineers, San Francisco District (COE). The objective for COE was to perform a test dredge disposal of ~230,000 m3 (300,000 yd3) of sand just offshore of the erosion hot spot, in depths between approximately 9 and 14 m. This disposal site was chosen because it is in a location where the strong tidal currents associated with the mouth of San Francisco Bay and waves can potentially feed sediment toward the littoral zone in the reach of the beach that is experiencing critical erosion. The onshore migration of sediment from the target disposal location might feed the primary longshore bar or the nearshore zone, and provide a buffer to erosion that peaks during winter months when large waves impact the region. The U.S. Geological Survey (USGS), in collaboration with the Sea Floor Mapping Lab (SFML) of California State University, Monterey Bay, monitored the initial bathymetric evolution of the test dredge disposal site and the adjacent coastal region from May 2005 to November 2005. This paper reports on this monitoring effort and assesses the short-term coastal response.

  4. Morphodynamic processes of the Elbe River estuary, Germany: the Coriolis effect, tidal asymmetry and human dredging

    Science.gov (United States)

    Li, Maotian; Ge, Jianzhong; Kappenberg, Jens; Much, Dagmar; Nino, Ohle; Chen, Zhongyuan

    2014-06-01

    The Digital Elevation Model (DEM) based on the historical sea-charts and on-site hydrological records were used to examine the morphological change of the Elbe River estuary. The results show that siltation predominated in the tidal flat in the northern estuary, with a net siltation rate of 1.8 cm·a-1 during 1927-2006. In contrast, a continuous erosion prevailed in the main river channel, south of the estuary, with a net erosion rate of 2.5 cm·a-1 in the same time. In addition, a seaward shift of the estuarine island has happened with the old island coalescing to the northern tidal flat and new one emerging through siltation process. The tidal asymmetry via ebbing flow (maximum at 140 cm·s-1, and average at 76 cm·s-1) prevailed in the tidal flat, meaning continuous aggradation northwestward, while flooding flow (maximum at 100 cm ·s-1, and average at 67 cm·s-1) dominated in the main river channel with deepening thaweg at south, showing a landward sedimentation via the tidal pumping processes. This dextral extension of the estuarine morphology is due to the Coriolis force, leading to the inconsistent directions of in-out flows, which enables to facilitate the estuarine siltation. Human dredging prevailing in the estuary has dramatically altered the nature of the silted river channel to erosional since the last century. This is characterized by a net erosion rate of 3.2 cm·a-1 derived from the DEMs mapping, but only partially accounting for the dredging amount of 1994-2006, when the total dredging volume was 67 × 106 m3, equal to 5.9 cm·a-1.

  5. Indirect Effects and Potential Cumulative Impacts of Dredging in an Urbanized Estuary

    Science.gov (United States)

    Sommerfield, C. K.; Chen, J.; Ralston, D. K.; Geyer, W. R.

    2016-02-01

    For over two centuries, the Delaware River and Bay estuary has supported one of the most economically important ports in the United States. To accommodate ships of ever-increasing size, the 165-km axial shipping channel has been deepened to over twice the natural depth of the estuary. While it is known that the channel has modified tides and sedimentation patterns in the estuary, unknown are the impacts on the ecosystem as a whole. A concern is the influence of channelization on sediment movement to the tidal wetland coast, which is eroding at rates on the order of meters per year. Tidal wetlands frame the entire estuary and provide vital ecosystem services ranging from recreation to carbon sequestration. To identify shifts in baseline conditions, we are performing a retrospective analysis of estuarine dynamics using historical bathymetry, numerical modeling, and observational studies. The period of interest extends from 1848 (50 years prior to channel construction) to present. During this period the channel was progressively deepened from its natural depth of 5.5 m to the current depth of 14 m. Preliminary modeling results support independent evidence that the salt intrusion and zone of rapid sediment deposition migrated several 10s of kilometers up-estuary as an indirect effect of deepening. Ironically, the locus of intense deposition now falls squarely within the Wilmington-Philadelphia port complex; river sediment that initially settles in this area is removed by maintenance dredging before it can disperse seaward. Sediment budgetary analysis indicates that the mass of sediment dredged from the upper estuary on average exceeds the mass of the new sediment supplied from the drainage basin. Hence, a probable cumulative impact of dredging is a reduction in sediment delivery to the lower estuary and fringing wetlands. Connections among the shipping channel, wave-tide interactions, and marsh edge erosion are a topic of ongoing modeling and observational research.

  6. Sediment and turbidity associated with offshore dredging increase coral disease prevalence on nearby reefs.

    Directory of Open Access Journals (Sweden)

    F Joseph Pollock

    Full Text Available In recent decades, coral reef ecosystems have declined to the extent that reefs are now threatened globally. While many water quality parameters have been proposed to contribute to reef declines, little evidence exists conclusively linking specific water quality parameters with increased disease prevalence in situ. Here we report evidence from in situ coral health surveys confirming that chronic exposure to dredging-associated sediment plumes significantly increase the prevalence of white syndromes, a devastating group of globally important coral diseases. Coral health surveys were conducted along a dredging-associated sediment plume gradient to assess the relationship between sedimentation, turbidity and coral health. Reefs exposed to the highest number of days under the sediment plume (296 to 347 days had two-fold higher levels of disease, largely driven by a 2.5-fold increase in white syndromes, and a six-fold increase in other signs of compromised coral health relative to reefs with little or no plume exposure (0 to 9 days. Multivariate modeling and ordination incorporating sediment exposure level, coral community composition and cover, predation and multiple thermal stress indices provided further confirmation that sediment plume exposure level was the main driver of elevated disease and other compromised coral health indicators. This study provides the first evidence linking dredging-associated sedimentation and turbidity with elevated coral disease prevalence in situ. Our results may help to explain observed increases in global coral disease prevalence in recent decades and suggest that minimizing sedimentation and turbidity associated with coastal development will provide an important management tool for controlling coral disease epizootics.

  7. Numerical assessment of the dispersion of overspilled sediment from a dredge barge and its sensitivity to various parameters.

    Science.gov (United States)

    Mestres, Marc; Sierra, Joan Pau; Mösso, César; Sánchez-Arcilla, Agustín; Hernáez, Mario; Morales, Jorge

    2014-02-15

    Marine dredging operations are not uncommon in coastal waters since they are necessary for several beneficial uses, such as harbour maintenance, beach nourishment or removal/capping of pollutants, amongst others. They also constitute a significant risk for the environment, changing its physical, chemical and biological characteristics, as evidenced by many authors. In this study, two numerical models are used to simulate the dispersion pattern of fine suspended sediment spilled from a dredge barge, considering different hydrodynamic scenarios, particle sizes and dredging tracks in a mesotidal environment. The results show that, in this particular case, the currents (largely induced by the tide) are the main responsible for the final disposition of the settled particles, being the other variables of secondary importance.

  8. Workshop on DNA repair.

    NARCIS (Netherlands)

    A.R. Lehmann (Alan); J.H.J. Hoeijmakers (Jan); A.A. van Zeeland (Albert); C.M.P. Backendorf (Claude); B.A. Bridges; A. Collins; R.P.D. Fuchs; G.P. Margison; R. Montesano; E. Moustacchi; A.T. Natarajan; M. Radman; A. Sarasin; E. Seeberg; C.A. Smith; M. Stefanini (Miria); L.H. Thompson; G.P. van der Schans; C.A. Weber (Christine); M.Z. Zdzienika

    1992-01-01

    textabstractA workshop on DNA repair with emphasis on eukaryotic systems was held, under the auspices of the EC Concerted Action on DNA Repair and Cancer, at Noordwijkerhout (The Netherlands) 14-19 April 1991. The local organization of the meeting was done under the auspices of the Medical Genetic C

  9. Laparoscopic lumbar hernia repair.

    Science.gov (United States)

    Madan, Atul K; Ternovits, Craig A; Speck, Karen E; Pritchard, F Elizabeth; Tichansky, David S

    2006-04-01

    Lumbar hernias are rare clinical entities that often pose a challenge for repair. Because of the surrounding anatomy, adequate surgical herniorraphy is often difficult. Minimally invasive surgery has become an option for these hernias. Herein, we describe two patients with lumbar hernias (one with a recurrent traumatic hernia and one with an incisional hernia). Both of these hernias were successfully repaired laparoscopically.

  10. Comparing the Thixotropic and Lightly Solidified Hardening Behavior of a Dredged Marine Clay

    OpenAIRE

    2014-01-01

    When a soil is disturbed upon remolding, it may lose part or all of its strength. As time passes, the structural arrangement of the soil particles would be restored to a stable form and the soil would regain hardness under constant volume and water content. The process is known as “thixotropic hardening”. On another note, dredged marine soils of the fine-grained type can be reused as a backfill material instead of being disposed to the open sea. The rest period required for the re...

  11. Flotation as a remediation technique for heavily polluted dredged material. 2. Characterisation of flotated fractions.

    Science.gov (United States)

    Cauwenberg, P; Verdonckt, F; Maes, A

    1998-01-19

    The particle size distribution and the metal speciation of the heavy metals were investigated on dredged sediment and on the fractions obtained by mechanical agitated (Denver) flotation. The transition metal ions (cadmium, copper, lead and zinc) were flotated specifically independent of the particle size. Particle size analysis, EDTA extraction and sequential extracts indicated that during flotation a redistribution of metals occurred due to the oxidation of metal sulphides. This oxidation process was more pronounced when the flotation was performed at higher pH values and resulted in a decrease in flotation specificity.

  12. A Cultural Resource Reconnaissance Study of Proposed Dredging and Construction Areas at Mission Bay Harbor, California,

    Science.gov (United States)

    1979-11-16

    Park 23 4.5 Existing Project Area Jetties 24 4.6 Dredging History 24 4.7 Historic Vessel Losses 25 5.0 SURVEY METHODOLOGY 27 5.1 Remote Sensing 29...basement rocks of the San Diego coastal area are a complex series of metamorphics and granitics formed in the Jurassic and Cretaceous periods. The surface...the sea. No evidence of its presence now exists within the project areas. 4.4 MISSION BAY PARK The California Division of Parks acquired miscellaneous

  13. INTERNAL REPAIR OF PIPELINES

    Energy Technology Data Exchange (ETDEWEB)

    Bill Bruce; Nancy Porter; George Ritter; Matt Boring; Mark Lozev; Ian Harris; Bill Mohr; Dennis Harwig; Robin Gordon; Chris Neary; Mike Sullivan

    2005-07-20

    The two broad categories of fiber-reinforced composite liner repair and deposited weld metal repair technologies were reviewed and evaluated for potential application for internal repair of gas transmission pipelines. Both are used to some extent for other applications and could be further developed for internal, local, structural repair of gas transmission pipelines. Principal conclusions from a survey of natural gas transmission industry pipeline operators can be summarized in terms of the following performance requirements for internal repair: (1) Use of internal repair is most attractive for river crossings, under other bodies of water, in difficult soil conditions, under highways, under congested intersections, and under railway crossings. (2) Internal pipe repair offers a strong potential advantage to the high cost of horizontal direct drilling when a new bore must be created to solve a leak or other problem. (3) Typical travel distances can be divided into three distinct groups: up to 305 m (1,000 ft.); between 305 m and 610 m (1,000 ft. and 2,000 ft.); and beyond 914 m (3,000 ft.). All three groups require pig-based systems. A despooled umbilical system would suffice for the first two groups which represents 81% of survey respondents. The third group would require an onboard self-contained power unit for propulsion and welding/liner repair energy needs. (4) The most common size range for 80% to 90% of operators surveyed is 508 mm (20 in.) to 762 mm (30 in.), with 95% using 558.8 mm (22 in.) pipe. Evaluation trials were conducted on pipe sections with simulated corrosion damage repaired with glass fiber-reinforced composite liners, carbon fiber-reinforced composite liners, and weld deposition. Additional un-repaired pipe sections were evaluated in the virgin condition and with simulated damage. Hydrostatic failure pressures for pipe sections repaired with glass fiber-reinforced composite liner were only marginally greater than that of pipe sections without

  14. Area Strip Mine Reclamation Using Dredged Material: A Field Demonstration.

    Science.gov (United States)

    1980-07-01

    capillare BARNYARD GRASS Echnochloa crusgalli GREEN FOXTAIL Setaria viridis GIANT FOXTAIL Setaria faberi CYPERACEAE RED-FOOTED SEDGE Cyperus erythrorhizos...marigold (Figures 15, 16, and 18 in the main text). The open mudflat areas are inhabited almost solely by rud rooted sedge , sprangletop, oak-leaved...goosefoot and red rooted sedge . Other species abundant in these areas include sprangletop and barnyard grass 7. The total 42 species surveyed as

  15. Spreading of sediment due to underwater blasting and dredging

    DEFF Research Database (Denmark)

    Nielsen, Morten Holtegaard; Bach, Lis; Bollwerk, Sandra

    2015-01-01

    leads to a wider spreading of the organic part of the sediment. Almost all material less than 2 μm, including surficial clay minerals and much organic material, was transported away from the construction site and its vicinity, which could imply mobilization and export of pollutants. Environmental...... or maybe even increasing the spreading of sediment, depending on, e.g., the resilience of the flora and fauna and the surficial sediment and the pollution therein....

  16. Management and outcomes of colovesical fistula repair.

    Science.gov (United States)

    Lynn, Elizabeth T; Ranasinghe, Nalin E; Dallas, Kai B; Divino, Celia M

    2012-05-01

    This large retrospective study presents the largest colovesical fistula (CVF) series to date. We report on recurrence risk factors and patient satisfaction based on quality of life after CVF repair. Approval was obtained from The Mount Sinai School of Medicine Institutional Review Board, and a retrospective review was performed from 2003 to 2010 involving 72 consecutive patients who underwent a colovesical fistula repair. The CVF recurrence rate was 11 per cent. Ten percent of our patients who had a history of radiation therapy were at a significantly higher risk of developing a recurrence. Noted recurrence rates were significantly higher in advanced bladder repairs compared with simple repair (P = 0.022). The modified (Gastrointestinal Quality of Life Index) surveys showed overall patient satisfaction score was 3.6, out of a maximum score of 4, regardless of the type of repair or any postoperative complications. Our study found the CVF recurrence rate to be 11 per cent. Patients at higher risk of recurrence include those needing advanced bladder repair, those with "complex" CVF, and those whose fistulas involve the urethra. Patient satisfaction was found to be more closely linked to the resolution of CVF symptoms, irrespective of the type of repair performed or development of postoperative complications.

  17. Dental materials for cleft palate repair.

    Science.gov (United States)

    Sharif, Faiza; Ur Rehman, Ihtesham; Muhammad, Nawshad; MacNeil, Sheila

    2016-04-01

    Numerous bone and soft tissue grafting techniques are followed to repair cleft of lip and palate (CLP) defects. In addition to the gold standard surgical interventions involving the use of autogenous grafts, various allogenic and xenogenic graft materials are available for bone regeneration. In an attempt to discover minimally invasive and cost effective treatments for cleft repair, an exceptional growth in synthetic biomedical graft materials have occurred. This study gives an overview of the use of dental materials to repair cleft of lip and palate (CLP). The eligibility criteria for this review were case studies, clinical trials and retrospective studies on the use of various types of dental materials in surgical repair of cleft palate defects. Any data available on the surgical interventions to repair alveolar or palatal cleft, with natural or synthetic graft materials was included in this review. Those datasets with long term clinical follow-up results were referred to as particularly relevant. The results provide encouraging evidence in favor of dental and other related biomedical materials to fill the gaps in clefts of lip and palate. The review presents the various bones and soft tissue replacement strategies currently used, tested or explored for the repair of cleft defects. There was little available data on the use of synthetic materials in cleft repair which was a limitation of this study. In conclusion although clinical trials on the use of synthetic materials are currently underway the uses of autologous implants are the preferred treatment methods to date.

  18. Reducing the impact of blue mussel (Mytilus edulis) dredging on the ecosystem in shallow water soft bottom areas

    DEFF Research Database (Denmark)

    Frandsen, Rikke; Eigaard, Ole Ritzau; Poulsen, Louise K.

    2015-01-01

    performance of the two gears by fishing in areas with a known blue mussel density. Results from the twin haul experiment demonstrate that the weight of sediment retained in the gear per square metre fished is 49% less in the light dredge compared with the Dutch dredge which will reduce resuspension...... reduce the impact of the fishery on the ecosystem by (i) reducing resuspension of sediment, (ii) reducing fuel consumption, and (iii) potentially reducing energy transfer to the sediment through a reduced gear drag resistance. A potential increase in catch efficiency may reduce the area affected. Fishing...

  19. Restoring marsh elevation in a rapidly subsiding salt marsh by thin-layer deposition of dredged material

    Science.gov (United States)

    Ford, M.A.; Cahoon, D.R.; Lynch, J.C.

    1999-01-01

    Thin-layer deposition of dredged material on coastal marsh by means of high-pressure spray dredging (Jet-Spray??2) technology has been proposed as a mechanism to minimize wetland impacts associated with traditional bucket dredging technologies and to restore soil elevations in deteriorated marshes of the Mississippi River delta. The impact of spray dredging on vegetated marsh and adjacent shallow-water habitat (formerly vegetated marsh that deteriorated to open water) was evaluated in a 0.5-ha Spartina alterniflora-dominated salt marsh in coastal Louisiana. The thickness of dredged sediment deposits was determined from artificial soil marker horizons and soil elevation change was determined from sedimentation-erosion tables (SET) established prior to spraying in both sprayed and reference marshes. The vertical accretion and elevation change measurements were made simultaneously to allow for calculation of shallow (~5 m depth) subsidence (accretion minus elevation change). Measurements made immediately following spraying in July 1996 revealed that stems of S. alterniflora were knocked down by the force of the spray and covered with 23 mm of dredged material. Stems of S. alterniflora soon recovered, and by July 1997 the percent cover of S. alterniflora had increased three-fold over pre-project conditions. Thus, the layer of dredged material was thin enough to allow for survival of the S. alterniflora plants, with no subsequent colonization by plant species typical of higher marsh zones. By February 1998, 62 mm of vertical accretion accumulated at this site, and little indication of disturbance was noted. Although not statistically significant, soil elevation change was greater than accretion on average at both the spray and reference marshes, suggesting that subsurface expansion caused by increased root biomass production and/or pore water storage influence elevation in this marsh region. In the adjacent shallow water pond, 129 mm of sediment was deposited in July

  20. INTERNAL REPAIR OF PIPELINES

    Energy Technology Data Exchange (ETDEWEB)

    Robin Gordon; Bill Bruce; Ian Harris; Dennis Harwig; George Ritter; Bill Mohr; Matt Boring; Nancy Porter; Mike Sullivan; Chris Neary

    2004-12-31

    The two broad categories of fiber-reinforced composite liner repair and deposited weld metal repair technologies were reviewed and evaluated for potential application for internal repair of gas transmission pipelines. Both are used to some extent for other applications and could be further developed for internal, local, structural repair of gas transmission pipelines. Principal conclusions from a survey of natural gas transmission industry pipeline operators can be summarized in terms of the following performance requirements for internal repair: (1) Use of internal repair is most attractive for river crossings, under other bodies of water, in difficult soil conditions, under highways, under congested intersections, and under railway crossings. (2) Internal pipe repair offers a strong potential advantage to the high cost of horizontal direct drilling when a new bore must be created to solve a leak or other problem. (3) Typical travel distances can be divided into three distinct groups: up to 305 m (1,000 ft.); between 305 m and 610 m (1,000 ft. and 2,000 ft.); and beyond 914 m (3,000 ft.). All three groups require pig-based systems. A despooled umbilical system would suffice for the first two groups which represents 81% of survey respondents. The third group would require an onboard self-contained power unit for propulsion and welding/liner repair energy needs. (4) The most common size range for 80% to 90% of operators surveyed is 508 mm (20 in.) to 762 mm (30 in.), with 95% using 558.8 mm (22 in.) pipe. Evaluation trials were conducted on pipe sections with simulated corrosion damage repaired with glass fiber-reinforced composite liners, carbon fiber-reinforced composite liners, and weld deposition. Additional un-repaired pipe sections were evaluated in the virgin condition and with simulated damage. Hydrostatic failure pressures for pipe sections repaired with glass fiber-reinforced composite liner were only marginally greater than that of pipe sections without

  1. Observation on Effect of Treatment of Alcoholic Fatty Liver by Traditional Medical Therapy of Liver-Clearing, Dampness-Removing and Collaterals-Dredging

    Institute of Scientific and Technical Information of China (English)

    张诗军; 陈泽雄; 劳绍贤; 黄必军

    2002-01-01

    @@ Spirits of wine is one of the pathogenetic factors of liver damage which is merely secondary to hepatitis virus. The incidence of fatty liver in Chinese adults is 5%-9% now. It is reported that interleukin-8 (IL-8) and lipid peroxidation play an important role in development of alcoholic fatty liver and liver damage(1-3). The authors have observed the therapeutic effect in 30 patients of alcoholic fatty liver treated with Chinese herbal drugs for Liver-clearing, Dampness-removing and Collaterals-dredging (abbre. as CHD) from Aug. 1999 to June 2001 and explored the relationship between the effects of treatment and some indices, including IL-8, malonyldialdehyde (MDA) and superoxide dismutase (SOD).

  2. INTERNAL REPAIR OF PIPELINES

    Energy Technology Data Exchange (ETDEWEB)

    Robin Gordon; Bill Bruce; Ian Harris; Dennis Harwig; George Ritter; Bill Mohr; Matt Boring; Nancy Porter; Mike Sullivan; Chris Neary

    2004-08-17

    The two broad categories of fiber-reinforced composite liner repair and deposited weld metal repair technologies were reviewed and evaluated for potential application for internal repair of gas transmission pipelines. Both are used to some extent for other applications and could be further developed for internal, local, structural repair of gas transmission pipelines. Principal conclusions from a survey of natural gas transmission industry pipeline operators can be summarized in terms of the following performance requirements for internal repair: (1) Use of internal repair is most attractive for river crossings, under other bodies of water, in difficult soil conditions, under highways, under congested intersections, and under railway. (2) Internal pipe repair offers a strong potential advantage to the high cost of horizontal direct drilling when a new bore must be created to solve a leak or other problem. (3) Typical travel distances can be divided into three distinct groups: up to 305 m (1,000 ft.); between 305 m and 610 m (1,000 ft. and 2,000 ft.); and beyond 914 m (3,000 ft.). All three groups require pig-based systems. A despooled umbilical system would suffice for the first two groups which represents 81% of survey respondents. The third group would require an onboard self-contained power unit for propulsion and welding/liner repair energy needs. (4) The most common size range for 80% to 90% of operators surveyed is 508 mm (20 in.) to 762 mm (30 in.), with 95% using 558.8 mm (22 in.) pipe. Evaluation trials were conducted on pipe sections with simulated corrosion damage repaired with glass fiber-reinforced composite liners, carbon fiber-reinforced composite liners, and weld deposition. Additional un-repaired pipe sections were evaluated in the virgin condition and with simulated damage. Hydrostatic failure pressures for pipe sections repaired with glass fiber-reinforced composite liner were only marginally greater than that of pipe sections without liners

  3. Technetium and the third dredge up in AGB stars. I. Field stars

    CERN Document Server

    Lebzelter, T

    2003-01-01

    We searched for Tc in a sample of long period variables selected by stellar luminosity derived from Hipparcos parallaxes. Tc, as an unstable s-process element, is a good indicator for the evolutionary status of stars on the asymptotic giant branch (AGB). In this paper we study the occurrence of Tc as a function of luminosity to provide constraints on the minimum luminosity for the third dredge up as estimated from recent stellar evolution models. A large number of AGB stars above the estimated theoretical limit for the third dredge up are found not to show Tc. We confirm previous findings that only a small fraction of the semiregular variables show Tc lines in their spectra. Contrary to earlier results by Little et al. (1987) we find also a significant number of Miras without Tc. The presence and absence of Tc is discussed in relation to the mass distribution of AGB stars. We find that a large fraction of the stars of our sample must have current masses of less than 1.5 M_{\\sun}. Combining our findings with s...

  4. Molecular opacities for low-mass metal-poor AGB stars undergoing the Third Dredge Up

    CERN Document Server

    Cristallo, S; Lederer, M T; Aringer, B

    2007-01-01

    The concomitant overabundances of C, N and s-process elements are commonly ascribed to the complex interplay of nucleosynthesis, mixing and mass loss taking place in Asymptotic Giant Branch stars. At low metallicity, the enhancement of C and/or N may be up to 1000 times larger than the original iron content and significantly affects the stellar structure and its evolution. For this reason, the interpretation of the already available and still growing amount of data concerning C-rich metal-poor stars belonging to our Galaxy as well as to dwarf spheroidal galaxies would require reliable AGB stellar models for low and very low metallicities. In this paper we address the question of calculation and use of appropriate opacity coefficients, which take into account the C enhancement caused by the third dredge up. A possible N enhancement, caused by the cool bottom process or by the engulfment of protons into the convective zone generated by a thermal pulse and the subsequent huge third dredge up, is also considered....

  5. Water quality of a coastal Louisiana swamp and how dredging is undermining restoration efforts

    Science.gov (United States)

    Lane, Robert R.; Huang, Haosheng; Day, John W.; Justic, Dubravko; DeLaune, Ronald D.

    2015-01-01

    The Bayou Boeuf Basin (BBB), a sub-basin of the Barataria Basin estuary in coastal Louisiana, consists of forested and floating wetlands receiving drainage from surrounding agricultural fields and urban watersheds. We characterized surface water quality in the BBB, and determined through hydrologic modeling if a series of levee breaks along major drainage channels would significantly improve water quality by allowing flow into surrounding wetlands. Surface water monitoring found surrounding sugarcane farm fields to be major sources of nutrient and sediment loading. Hydrological modeling indicated that levee breaks would increase N reduction from the current 21.4% to only 29.2%, which is much lower than the anticipated 90-100% removal rate. This was due to several factors, one them being dredging of main drainage channels to such a degree that water levels do not rise much above the surrounding wetland elevation even during severe storms, so only a very small fraction of the stormwater carried in the channel is exposed to wetlands. These unexpected results provide insight into an undoubtedly pervasive problem in human dominated wetland systems; that of decreased flooding during storm events due to channel deepening by dredging activities. Additional water quality management practices should be implemented at the farm field level, prior to water entering major drainage canals.

  6. Gravel seeding - A suitable technique for restoring the seabed following marine aggregate dredging?

    Science.gov (United States)

    Cooper, Keith; Ware, Suzanne; Vanstaen, Koen; Barry, Jon

    2011-01-01

    Restoration of offshore marine habitats is a relatively new concept, with attempts in the European Union being largely instigated by requirements of various strategic directives. In this experiment, we investigate the practicality and effectiveness of gravel seeding, using a commercial aggregate dredging vessel, in order to recreate a gravel habitat. The experimental design consisted of a Treatment and Control site, both within an area of historic dredging characterised by an overburden of sand, and a gravel dominated Reference site. All sites were surveyed, using a combination of acoustic, camera and grab techniques, 2 months before, and then at 0, 12 and 22 months after the deposition of 4444 m 3 of gravel dominated sediments within the Treatment site. Although financial and practical constraints limited replication of the Treatment to one area, and so precluded strong statistical conclusions, our results suggested that the technique was both practically feasible, and successful in terms of returning the physical and biological attributes at the Treatment site to a state more representative of gravelly substrata in the wider, un-impacted environment.

  7. Possible production of ceramic tiles from marine dredging spoils alone and mixed with other waste materials.

    Science.gov (United States)

    Baruzzo, Daniela; Minichelli, Dino; Bruckner, Sergio; Fedrizzi, Lorenzo; Bachiorrini, Alessandro; Maschio, Stefano

    2006-06-30

    Dredging spoils, due to their composition could be considered a new potential source for the production of monolithic ceramics. Nevertheless, abundance of coloured oxides in these materials preclude the possibility of obtaining white products, but not that of producing ceramics with a good mechanical behaviour. As goal of the present research we have produced and studied samples using not only dredging spoils alone, but also mixtures with other waste materials such as bottom ashes from an incinerator of municipal solid waste, incinerated seawage sludge from a municipal seawage treatment plant and steelworks slag. Blending of different components was done by attrition milling. Powders were pressed into specimens which were air sintered in a muffle furnace and their shrinkage on firing was determined. Water absorption, density, strength, hardness, fracture toughness, thermal expansion coefficient of the fired bodies were measured; XRD and SEM images were also examined. The fired samples were finally tested in acidic environment in order to evaluate their elution behaviour and consequently their environmental compatibility. It is observed that, although the shrinkage on firing is too high for the production of tiles, in all the compositions studied the sintering procedure leads to fine microstructures, good mechanical properties and to a limitation of the release of many of the most hazardous metals contained in the starting powders.

  8. Shellfish dredging pushes a flexible avian top predator out of a marine protected area.

    Directory of Open Access Journals (Sweden)

    Jan A van Gils

    2006-11-01

    Full Text Available There is a widespread concern about the direct and indirect effects of industrial fisheries; this concern is particularly pertinent for so-called "marine protected areas" (MPAs, which should be safeguarded by national and international law. The intertidal flats of the Dutch Wadden Sea are a State Nature Monument and are protected under the Ramsar convention and the European Union's Habitat and Birds Directives. Until 2004, the Dutch government granted permission for ~75% of the intertidal flats to be exploited by mechanical dredgers for edible cockles (Cerastoderma edule. Here we show that dredged areas belonged to the limited area of intertidal flats that were of sufficient quality for red knots (Calidris canutus islandica, a long-distance migrant molluscivore specialist, to feed. Dredging led to relatively lower settlement rates of cockles and also reduced their quality (ratio of flesh to shell. From 1998 to 2002, red knots increased gizzard mass to compensate for a gradual loss in shellfish quality, but this compensation was not sufficient and led to decreases in local survival. Therefore, the gradual destruction of the necessary intertidal resources explains both the loss of red knots from the Dutch Wadden Sea and the decline of the European wintering population. This study shows that MPAs that do not provide adequate protection from fishing may fail in their conservation objectives.

  9. Shellfish dredging pushes a flexible avian top predator out of a marine protected area.

    Science.gov (United States)

    van Gils, Jan A; Piersma, Theunis; Dekinga, Anne; Spaans, Bernard; Kraan, Casper

    2006-11-01

    There is a widespread concern about the direct and indirect effects of industrial fisheries; this concern is particularly pertinent for so-called "marine protected areas" (MPAs), which should be safeguarded by national and international law. The intertidal flats of the Dutch Wadden Sea are a State Nature Monument and are protected under the Ramsar convention and the European Union's Habitat and Birds Directives. Until 2004, the Dutch government granted permission for ~75% of the intertidal flats to be exploited by mechanical dredgers for edible cockles (Cerastoderma edule). Here we show that dredged areas belonged to the limited area of intertidal flats that were of sufficient quality for red knots (Calidris canutus islandica), a long-distance migrant molluscivore specialist, to feed. Dredging led to relatively lower settlement rates of cockles and also reduced their quality (ratio of flesh to shell). From 1998 to 2002, red knots increased gizzard mass to compensate for a gradual loss in shellfish quality, but this compensation was not sufficient and led to decreases in local survival. Therefore, the gradual destruction of the necessary intertidal resources explains both the loss of red knots from the Dutch Wadden Sea and the decline of the European wintering population. This study shows that MPAs that do not provide adequate protection from fishing may fail in their conservation objectives.

  10. Construction, repair and maintenance

    Energy Technology Data Exchange (ETDEWEB)

    Hinger, R. [Terasen Pipelines, Calgary, AB (Canada); Wong, P. [KC Integrity Corp., Calgary, AB (Canada); Yeomans, M.; Glover, A. [TransCanada PipeLines Ltd., Calgary, AB (Canada)

    2003-07-01

    The presentations by Working Group 4 focused on construction, repair and maintenance of pipelines with particular reference to high-strength steels and their applications for natural gas transmission pipelines. Discussions focused on how technology can be used to provide cost-effective design and construction solutions for long distance pipelines in a manner that does not compromise safety and reliability. The role that carbon plays in increasing the toughness of steel was also discussed. A few fundamental changes in steel production technology and a reduction in carbon content can result in a simultaneous increase in strength and toughness of steels. The cost impact of this technology was summarized. It was concluded that high strength steels offer effective solutions to deliver cost-effective pipelines to transport natural gas from northern basins. This session also presented pipeline routes that transport diluted bitumens from the Athabasca Oil Sands Project and the Muskeg River Mine to upgrader facilities in Alberta. Construction issues included design conservatism, water course crossings, winter construction, winter ditching, and public consultation. Examples of high strength steel pipe applications were also included with reference to experience gained by TransCanada and Corridor Pipeline. tabs., figs.

  11. Salvage hypospadias repairs

    Directory of Open Access Journals (Sweden)

    Sripathi V

    2008-01-01

    Full Text Available Aim: Review of our experience and to develop an algorithm for salvage procedures in the management of hypospadias cripples and treatment of urethral strictures following hypospadias repair. Methods: This is a retrospective review of hypospadias surgeries over a 41-month period. Out of a total 168 surgeries, 20 were salvage/re-operative repairs. In three children a Duplay repair was feasible, while in four others a variety of single-stage repairs could be done. The repair was staged in seven children - buccal mucosal grafts (BMGs in five, buccal mucosal tube in one, and skin graft in one. Five children with dense strictures were managed by dorsal BMG inlay grafting in one, vascularized tunical onlay grafting on the ventrum in one, and a free tunical patch in one. Three children were treated by internal urethrotomy and stenting for four weeks with a poor outcome. Results: The age of children ranged from 1.5-15 years (mean 4.5. Follow-up ranged from 3 months to 3.5 years. Excellent results were obtained in 10 children (50% with a well-surfaced erect penis and a slit-like meatus. Glans closure could not be achieved and meatus was coronal in three. Two children developed fistulae following a Duplay repair and following a staged BMG. Three repairs failed completely - a composite repair broke down, a BMG tube stenosed with a proximal leak, and a stricture recurred with loss of a ventral free tunical graft. Conclusions: In salvage procedures performed on hypospadias cripples, a staged repair with buccal mucosa as an inlay in the first stage followed by tubularization 4-6 months later provides good results. A simple algorithm to plan corrective surgery in failed hypospadias cases and obtain satisfactory results is devised.

  12. The Effectiveness of Open Repair Versus Percutaneous Repair for an Acute Achilles Tendon Rupture.

    Science.gov (United States)

    Krueger, Heidi; David, Shannon

    2016-12-01

    Clinical Scenario: There are 2 approaches available for surgical repair of the Achilles tendon: open or percutaneous. However, there is controversy over which repair is superior. Focused Clinical Question: Which type of surgery is better in providing the best overall patient outcome, open or percutaneous repair, in physically active men and women with acute Achilles tendon ruptures? Summary of Search, "Best Evidence" Appraised, and Key Findings: The literature was searched for studies of level 3 evidence or higher that investigated the effectiveness of open repair versus percutaneous repair on acute Achilles tendon ruptures in physically active men and women. The literature search resulted in 3 studies for possible inclusion. All 3 good-quality studies were included. Clinical Bottom Line: There is supporting evidence to indicate that percutaneous repair is the best option for Achilles tendon surgery when it comes to the physically active population. Percutaneous repair has faster surgery times, less risk of complications, and faster recovery times over having an open repair, although it is acknowledged that every patient has a different situation and best individual option may vary patient to patient.

  13. Methods of repairing a substrate

    Science.gov (United States)

    Riedell, James A. (Inventor); Easler, Timothy E. (Inventor)

    2011-01-01

    A precursor of a ceramic adhesive suitable for use in a vacuum, thermal, and microgravity environment. The precursor of the ceramic adhesive includes a silicon-based, preceramic polymer and at least one ceramic powder selected from the group consisting of aluminum oxide, aluminum nitride, boron carbide, boron oxide, boron nitride, hafnium boride, hafnium carbide, hafnium oxide, lithium aluminate, molybdenum silicide, niobium carbide, niobium nitride, silicon boride, silicon carbide, silicon oxide, silicon nitride, tin oxide, tantalum boride, tantalum carbide, tantalum oxide, tantalum nitride, titanium boride, titanium carbide, titanium oxide, titanium nitride, yttrium oxide, zirconium boride, zirconium carbide, zirconium oxide, and zirconium silicate. Methods of forming the ceramic adhesive and of repairing a substrate in a vacuum and microgravity environment are also disclosed, as is a substrate repaired with the ceramic adhesive.

  14. Light-Curing Adhesive Repair Tapes

    Science.gov (United States)

    Allred, Ronald; Haight, Andrea Hoyt

    2009-01-01

    Adhesive tapes, the adhesive resins of which can be cured (and thereby rigidized) by exposure to ultraviolet and/or visible light, are being developed as repair patch materials. The tapes, including their resin components, consist entirely of solid, low-outgassing, nonhazardous or minimally hazardous materials. They can be used in air or in vacuum and can be cured rapidly, even at temperatures as low as -20 C. Although these tapes were originally intended for use in repairing structures in outer space, they can also be used on Earth for quickly repairing a wide variety of structures. They can be expected to be especially useful in situations in which it is necessary to rigidize tapes after wrapping them around or pressing them onto the parts to be repaired.

  15. Repair and regeneration in endodontics.

    Science.gov (United States)

    Lin, L M; Rosenberg, P A

    2011-10-01

    The ideal objective of treatment of established diseases, including irreversible pulpitis and apical periodontitis, is to achieve wound healing. Wound healing can result in repair or regeneration. The ultimate goal of wound healing is to restore the original architecture and biological function of the injured tissue or organ. Although humans are equipped with powerful innate and adaptive immune defence mechanisms, many intrinsic and extrinsic factors can affect wound healing. Complete regeneration following injury in humans can occur only in the pre-natal foetus within 24 weeks of gestation. Post-natal wounds including irreversible pulpitis or apical periodontitis always heal by repair or by a combination of repair and regeneration. Somatic cells, such as fibroblasts, macrophages, cementoblasts and osteoblasts, in the pulp and periapical tissues have limited potential for regeneration following injury and lack of telomerase. Wound healing of irreversible pulpitis and apical periodontitis requires recruitment and differentiation of progenitor/stem cells into tissue-committed somatic cells. Stem cell differentiation is regulated by intrinsic factors and extrinsic micro-environmental cues. Functionality of stem cells appears to show an age-related decline because of the change in intrinsic properties and diminished signals within the extrinsic local and systemic environment that modulate the function of stem cells or their progeny. Infection induces an immuno-inflammatory response and tissue destruction, which hinders the potential of tissue regeneration. Therefore, prevention, early detection and treatment of inflammation/infection of pulpal and periapical disease can enhance regeneration and minimize the repair of pulpal and periapical tissues after endodontic therapy. © 2011 International Endodontic Journal.

  16. Repair of Electronics for Long Duration Spaceflight

    Science.gov (United States)

    Pettegrew, Richard D.; Easton, John; Struk, Peter

    2007-01-01

    To reduce mission risk, long duration spaceflight and exploration activities will require greater degrees of self-sufficiency with regards to repair capability than have ever been employed before in space exploration. The current repair paradigm of replacing Orbital Replacement Units (ORUs) of malfunctioning avionics and electronic hardware will be impractical, since carrying all of the spares that could possibly be needed for a long duration mission would require upmass and volume at unprecedented and unacceptable levels. A strategy of component-level repair for electronics, however, could significantly reduce the mass and volume necessary for spares and enhance mission safety via a generic contingency capability. This approach is already used to varying degrees by the U.S. Navy, where vessels at sea experience some similar constraints such as the need for self sufficiency for moderately long time periods, and restrictions on volume of repair spares and infrastructure. The concept of conducting component-level repairs of electronics in spacecraft requires the development of design guidelines for future avionics (to enable repair), development of diagnostic techniques to allow an astronaut to pinpoint the faulty component aboard a vastly complex vehicle, and development of tools and methodologies for dealing with the physical processes of replacing the component. This physical process includes tasks such as conformal coating removal and replacement, component removal, replacement, and alignment--all in the difficulty of a reduced gravity environment. Further, the gravitational effects on the soldering process must be characterized and accounted for to ensure reliability of the newly repaired components. The Component-Level Electronics-Assembly Repair (CLEAR) project under the NASA Supportability program was established to develop and demonstrate the practicality of this repair approach. CLEAR involves collaborative efforts between NASA s Glenn Research Center

  17. Progress of peripheral nerve repair

    Institute of Scientific and Technical Information of China (English)

    陈峥嵘

    2002-01-01

    Study on repair of peripheral nerve injury has been proceeding over a long period of time. With the use of microsurgery technique since 1960s,the quality of nerve repair has been greatly improved. In the past 40 years, with the continuous increase of surgical repair methods, more progress has been made on the basic research of peripheral nerve repair.

  18. Achilles tendon repair

    Science.gov (United States)

    Achilles tendon rupture-surgery; Percutaneous Achilles tendon rupture repair ... To fix your torn Achilles tendon, the surgeon will: Make a cut down the back of your heel Make several small cuts rather than one large cut ...

  19. Eye muscle repair - slideshow

    Science.gov (United States)

    ... page: //medlineplus.gov/ency/presentations/100062.htm Eye muscle repair - series—Normal anatomy To use the sharing ... the eyeball to the eye socket. The external muscles of the eye are found behind the conjunctiva. ...

  20. Tracheoesophageal fistula repair - slideshow

    Science.gov (United States)

    ... page: //medlineplus.gov/ency/presentations/100103.htm Tracheoesophageal fistula repair - series—Normal anatomy To use the sharing ... Editorial team. Related MedlinePlus Health Topics Esophagus Disorders Fistulas Tracheal Disorders A.D.A.M., Inc. is ...

  1. Inguinal hernia repair - slideshow

    Science.gov (United States)

    ... page: //medlineplus.gov/ency/presentations/100027.htm Inguinal hernia repair - series—Normal anatomy To use the sharing ... to slide 4 out of 4 Overview A hernia occurs when part of an organ protrudes through ...

  2. INTERNAL REPAIR OF PIPELINES

    Energy Technology Data Exchange (ETDEWEB)

    Robin Gordon; Bill Bruce; Ian Harris; Dennis Harwig; Nancy Porter; Mike Sullivan; Chris Neary

    2004-04-12

    The two broad categories of deposited weld metal repair and fiber-reinforced composite liner repair technologies were reviewed for potential application for internal repair of gas transmission pipelines. Both are used to some extent for other applications and could be further developed for internal, local, structural repair of gas transmission pipelines. Preliminary test programs were developed for both deposited weld metal repair and for fiber-reinforced composite liner repair. Evaluation trials have been conducted using a modified fiber-reinforced composite liner provided by RolaTube and pipe sections without liners. All pipe section specimens failed in areas of simulated damage. Pipe sections containing fiber-reinforced composite liners failed at pressures marginally greater than the pipe sections without liners. The next step is to evaluate a liner material with a modulus of elasticity approximately 95% of the modulus of elasticity for steel. Preliminary welding parameters were developed for deposited weld metal repair in preparation of the receipt of Pacific Gas & Electric's internal pipeline welding repair system (that was designed specifically for 559 mm (22 in.) diameter pipe) and the receipt of 559 mm (22 in.) pipe sections from Panhandle Eastern. The next steps are to transfer welding parameters to the PG&E system and to pressure test repaired pipe sections to failure. A survey of pipeline operators was conducted to better understand the needs and performance requirements of the natural gas transmission industry regarding internal repair. Completed surveys contained the following principal conclusions: (1) Use of internal weld repair is most attractive for river crossings, under other bodies of water, in difficult soil conditions, under highways, under congested intersections, and under railway crossings. (2) Internal pipe repair offers a strong potential advantage to the high cost of horizontal direct drilling (HDD) when a new bore must be created

  3. Pectus excavatum repair - slideshow

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/presentations/100035.htm Pectus excavatum repair - series—Normal anatomy To use the sharing ... Go to slide 4 out of 4 Overview Pectus excavatum is a deformity of the front of the ...

  4. Hiatal hernia repair - slideshow

    Science.gov (United States)

    ... presentations/100028.htm Hiatal hernia repair - series—Normal anatomy To use the sharing features on ... Overview The esophagus runs through the diaphragm to the stomach. It functions to carry food from the mouth ...

  5. Repairing ceramic insulating tiles

    Science.gov (United States)

    Dunn, B. R.; Laymance, E. L.

    1980-01-01

    Fused-silica tiles containing large voids or gauges are repaired without adhesives by plug insertion method. Tiles are useful in conduits for high-temperature gases, in furnaces, and in other applications involving heat insulation.

  6. Rotator cuff repair - slideshow

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/presentations/100229.htm Rotator cuff repair - series—Normal anatomy To use the sharing ... to slide 4 out of 4 Overview The rotator cuff is a group of muscles and tendons that ...

  7. Cleft lip repair - slideshow

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/presentations/100010.htm Cleft lip repair - series—Normal anatomy To use the sharing ... abnormal opening in the middle of the upper lip. A cleft palate is an opening in the roof of ...

  8. Guidelines for assessing the valorization of a waste into cementitious material: dredged sediment for production of self compacting concrete

    Directory of Open Access Journals (Sweden)

    Rozas, F.

    2015-09-01

    Full Text Available This article presents some guidelines in order to analyse the feasibility of including a waste material in the production of a structural cementitious material. First of all, the compatibility of the waste with a cementitious material has to be assured; then, if necessary, a decontamination step will be carried out; after, decision on the type of material has to be taken based on different aspects, with special emphasis on the granulometry. As a last step, mechanical, environmental and durability properties have to be evaluated. Then the procedure is illustrated with a full example, obtaining a self compacting concrete (SCC including dredged sediment taken from a Spanish harbour.Este artículo presenta algunas directrices con el fin de analizar la posibilidad de incluir un material de desecho en la producción de un material base cemento estructural. En primer lugar, debe asegurarse la compatibilidad de los residuos con el material base cemento. Tras ello, si es necesario, se llevará a cabo la etapa de descontaminación del residuo. Después debe tomarse la decisión sobre el tipo de material a utilizar en base a diferentes aspectos, haciendo especial énfasis en la granulometría. Como último paso, deben evaluarse las propiedades mecánicas, ambientales y de durabilidad del producto final. El procedimiento a seguir se ilustra con un ejemplo concreto basado en la obtención de un hormigón autocompactante (SCC incluyendo en su fabricación sedimentos dragados tomados de un puerto español.

  9. Ecological evaluation of proposed discharge of dredged material from Oakland Harbor into ocean waters (Phase 3 A of -42-foot project). Volume 1, Analyses and discussion

    Energy Technology Data Exchange (ETDEWEB)

    Ward, J.A.; Word, J.Q.; Pinza, M.R.; Mayhew, H.L.; Barrows, E.S.; Lefkovitz, L.F. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1992-09-01

    The Battelle/Marine Sciences Laboratory (MSL) conducted a study to detemine whether dredged sediments from Oakland Inner and Outer Harbors were, suitable for ocean disposal. Nineteen test treatments, six reference treatments, and control treatments were tested for physical/chemical parameters, water column effects, dredged sediment-toxicity, and bioaccumulation potential. Physical/chemical parameters were analyzed at each site and each composite sediment to a depth of -44 ft MLLW. These parameters included analysis for geological characteristics, conventional sediment measurements (grain size, total volatile solids, total organic carbon, oil and grease, and total petroleum hydrocarbons), metals, polynuclear aromatic hydrocarbons (PAHs), pesticides, butyltins, and polychlorinated biphenyls (PCBs). Physical/chemical data were used in support of the toxicological and bioaccumulation testing, but were not used in the decision-making criteria described iti the Draft Implementation Manual under Tier III testing. To evaluate water column effects, MSL conducted suspended-particulate-phase (SPP) tests using the mysid shrimp Holmesimysis sculpta, speckled sanddab Citharichtys stigmaeus, and larvae of the pacific oyster Crassostrea gigas- Both a 48-h and a 96-h test were performed. The MSL evaluated dredgedsediment toxicity by conducting a total of eight solid-phase toxicity tests using the following organisms: the bivalve clam Macoma nasuta, the polychaste worm Nepthys caecoides, the speckled sanddab C. stigmaeus, and the arnphipod Rhepoxynius abronius. Test duration ranged From 10 to 28 days. Bioaccumulation potential was evaluated in the 28-day M. nasuta and N. caecoides solid-phase exposures by measuring the Contaminants of concern present in their tissues after exposure to test, reference, and control sediments.

  10. Ecological evaluation of proposed discharge of dredged material from Oakland Harbor into ocean waters (Phase 3 A of -42-foot project)

    Energy Technology Data Exchange (ETDEWEB)

    Ward, J.A.; Word, J.Q.; Pinza, M.R.; Mayhew, H.L.; Barrows, E.S.; Lefkovitz, L.F. (Battelle/Marine Sciences Lab., Sequim, WA (United States))

    1992-09-01

    The Battelle/Marine Sciences Laboratory (MSL) conducted a study to detemine whether dredged sediments from Oakland Inner and Outer Harbors were, suitable for ocean disposal. Nineteen test treatments, six reference treatments, and control treatments were tested for physical/chemical parameters, water column effects, dredged sediment-toxicity, and bioaccumulation potential. Physical/chemical parameters were analyzed at each site and each composite sediment to a depth of -44 ft MLLW. These parameters included analysis for geological characteristics, conventional sediment measurements (grain size, total volatile solids, total organic carbon, oil and grease, and total petroleum hydrocarbons), metals, polynuclear aromatic hydrocarbons (PAHs), pesticides, butyltins, and polychlorinated biphenyls (PCBs). Physical/chemical data were used in support of the toxicological and bioaccumulation testing, but were not used in the decision-making criteria described iti the Draft Implementation Manual under Tier III testing. To evaluate water column effects, MSL conducted suspended-particulate-phase (SPP) tests using the mysid shrimp Holmesimysis sculpta, speckled sanddab Citharichtys stigmaeus, and larvae of the pacific oyster Crassostrea gigas- Both a 48-h and a 96-h test were performed. The MSL evaluated dredgedsediment toxicity by conducting a total of eight solid-phase toxicity tests using the following organisms: the bivalve clam Macoma nasuta, the polychaste worm Nepthys caecoides, the speckled sanddab C. stigmaeus, and the arnphipod Rhepoxynius abronius. Test duration ranged From 10 to 28 days. Bioaccumulation potential was evaluated in the 28-day M. nasuta and N. caecoides solid-phase exposures by measuring the Contaminants of concern present in their tissues after exposure to test, reference, and control sediments.

  11. Ecological evaluation of proposed dredged material from the John F. Baldwin Ship Channel: Phase 3 -- biological testing

    Energy Technology Data Exchange (ETDEWEB)

    Kohn, N.P.; Karle, L.M.; Pinza, M.R.; Mayhew, H.L.; White, P.J.; Gruendell, B.D.; Word, J.Q. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1993-10-01

    The John F. Baldwin Ship Channel is a 28-mile-long portion of the San Francisco Bay to Stockton Ship Channel, the primary shipping lane through San Francisco Bay and Delta. The San Francisco District of the US Army Corps of Engineers (USACE) is responsible for construction of the John F. Baldwin Ship Channel, which is authorized to be deepened to a project depth of {minus}45 ft relative to mean lower low water (MLLW). Approximately 8.5 million cubic yards (mcy) of sediment will be removed from the channel to reach this project depth. The USACE requested Battelle/Marine Sciences Laboratory (MSL) to conduct testing for ocean disposal under the guidelines in Evaluation of Dredged Material Proposed for Ocean Disposal-Testing Manual (EPA/USACE 1991). This testing manual contains a tiered evaluation approach developed specifically for ocean disposal of dredged material at a selected site. In this study, John F. Baldwin Ship Channel sediments were evaluated under the Tier III (biological) testing guidance, which is considered to be highly stringent and protective of the environment. The Tier III guidance for ocean disposal testing requires tests of water column effects, (following dredged material disposal), deposited sediment toxicity, and bioaccumulation of contaminants from deposited sediment (dredged material).

  12. 75 FR 65483 - Proposed Reissuance of General NPDES Permits (GP) for Alaskan Medium-Size Suction Dredging...

    Science.gov (United States)

    2010-10-25

    ... From the Federal Register Online via the Government Publishing Office ENVIRONMENTAL PROTECTION AGENCY Proposed Reissuance of General NPDES Permits (GP) for Alaskan Medium-Size Suction Dredging (Permit... general permit. SUMMARY: On October 7, 2010, the general permit regulating the activities of suction...

  13. 75 FR 5708 - Ocean Dumping; Designation of Ocean Dredged Material Disposal Sites Offshore of the Siuslaw River...

    Science.gov (United States)

    2010-02-04

    ... AGENCY 40 CFR Part 228 Ocean Dumping; Designation of Ocean Dredged Material Disposal Sites Offshore of... any person, EPA and the Corps must evaluate the project according to the ocean dumping regulatory criteria (40 CFR part 227) and authorize disposal. EPA independently evaluates proposed dumping and has...

  14. Monitoring of dredged-dumped sediment dispersal off the Bay of the Seine (northern France) using environmental magnetism

    Science.gov (United States)

    Nizou, Jean; Demory, François; Dubrulle-Brunaud, Carole

    2016-07-01

    In this study, we developed a novel approach for fingerprinting dredged-dumped sediments at sea using magnetic susceptibility. Several magnetic measurements were performed on discrete sedimentary samples from the dredged areas in the Seine River and from the Bay of Seine seafloor before and after dumping. The dredged sediments showed higher susceptibility values than the undisturbed seafloor, which allowed the mapping of the dispersion of dredged-dumped sediments. In the vicinity of the coast and the estuary, high-susceptibility terrestrial input from rivers could also be mapped by this technique, therefore monitoring of the dumping by the susceptibility proxy is limited to the offshore areas. This susceptibility signal is controlled by the ferromagnetic fraction of the sediment. Furthermore, a constant magnetite-dominated magneto-mineralogy is observed in the study area. In addition to the susceptibility, a magnetic grain size parameter of the low-coercive fraction was also found to be sensitive to dumping. Both tracers showed an in progress resilience of the sedimentary environment during a 6-month survey.

  15. Biochemical ripening of dredged sediments. Part 1. Kinetics of biological organic matter mineralization and chemical sulfur oxidation

    NARCIS (Netherlands)

    Vermeulen, J.; Gool, M.P.M. van; Dorleijn, A.S.; Joziasse, J.; Bruning, H.; Rulkens, W.H.; Grotenhuis, J.T.C.

    2007-01-01

    After dredged sediments have settled in a temporary upland disposal site, ripening starts, which turns waterlogged sediment into aerated soil. Aerobic biological mineralization of organic matter (OM) and chemical oxidation of reduced sulfur compounds are the major biochemical ripening processes. Qua

  16. Effects of dredging and lanthanum-modified clay on water quality variables in an enclosure study in a hypertrophic pond

    NARCIS (Netherlands)

    Lürling, Miquel; Waajen, Guido; Engels, Bart; Oosterhout, van Frank

    2017-01-01

    An enclosure experiment was conducted between July and September 2009 to compare the effectiveness of a phosphate fixative, the lanthanum-modified bentonite clay Phoslock® (LMB), dredging, and their combination in controlling eutrophication in a hypertrophic urban pond in Heesch, The Netherlands.

  17. Declining metal levels at Foundry Cove (Hudson River, New York): Response to localized dredging of contaminated sediments

    Energy Technology Data Exchange (ETDEWEB)

    Mackie, Joshua A. [Moss Landing Marine Laboratories, Invertebrate Zoology, 8272 Moss Landing Road, CA 95039-9647 (United States)], E-mail: jmackie@mlml.calstate.edu; Natali, Susan M.; Levinton, Jeffrey S. [Stony Brook University, Department of Ecology and Evolution, Stony Brook, NY 11794-5245 (United States); Sanudo-Wilhelmy, Sergio A. [Stony Brook University, Department of Ecology and Evolution, Stony Brook, NY 11794-5245 (United States); University of Southern California, Marine and Environmental Biology, Los Angeles, CA 90089-0371 (United States)

    2007-09-15

    This study examines the effectiveness of remediating a well-recognized case of heavy metal pollution at Foundry Cove (FC), Hudson River, New York. This tidal freshwater marsh was polluted with battery-factory wastes (1953-1979) and dredged in 1994-1995. Eight years after remediation, dissolved and particulate metals (Cd, Co, Cu, Pb, Ni, and Ag) were found to be lower than levels in the lower Hudson near New York City. Levels of metals (Co, Ni, Cd) on suspended particles were comparatively high. Concentrations of surface sediment Cd throughout the marsh system remain high, but have decreased both in the dredged and undredged areas: Cd was 2.4-230 mg/kg dw of sediment in 2005 vs. 109-1500 mg/kg in the same area in 1983. The rate of tidal export of Cd from FC has decreased by >300-fold, suggesting that dredging successfully stemmed a major source of Cd to the Hudson River. - Dredging of a hotspot of metal-contaminated sediment is associated with a recognizable local and river-wide decline in cadmium in the Hudson River, New York.

  18. Choreography of oxidative damage repair in mammalian genomes.

    Science.gov (United States)

    Mitra, Sankar; Izumi, Tadahide; Boldogh, Istvan; Bhakat, Kishor K; Hill, Jeff W; Hazra, Tapas K

    2002-07-01

    The lesions induced by reactive oxygen species in both nuclear and mitochondrial genomes include altered bases, abasic (AP) sites, and single-strand breaks, all repaired primarily via the base excision repair (BER) pathway. Although the basic BER process (consisting of five sequential steps) could be reconstituted in vitro with only four enzymes, it is now evident that repair of oxidative damage, at least in mammalian cell nuclei, is more complex, and involves a number of additional proteins, including transcription- and replication-associated factors. These proteins may be required in sequential repair steps in concert with other cellular changes, starting with nuclear targeting of the early repair enzymes in response to oxidative stress, facilitation of lesion recognition, and access by chromatin unfolding via histone acetylation, and formation of metastable complexes of repair enzymes and other accessory proteins. Distinct, specific subclasses of protein complexes may be formed for repair of oxidative lesions in the nucleus in transcribed vs. nontranscribed sequences in chromatin, in quiescent vs. cycling cells, and in nascent vs. parental DNA strands in replicating cells. Characterizing the proteins for each repair subpathway, their signaling-dependent modifications and interactions in the nuclear as well as mitochondrial repair complexes, will be a major focus of future research in oxidative damage repair.

  19. Combined epigastric hernia repair and mini-abdominoplasty. Case report.

    Science.gov (United States)

    Grella, Roberto; Razzano, Sergio; Lamberti, Rossella; Trojaniello, Biagio; D'Andrea, Francesco; Nicoletti, Giovanni Francesco

    2015-01-01

    The objectives of abdominal hernia repair are to restore the structural integrity of the abdominal wall. Current techniques include primary closure, staged repair and the use of prosthetic materials. Techniques for mini-abdominoplasty include the use of the transverse lower abdominal incision and the resection of excess skin. We report a case of epigastric hernia repair through a transverse lower abdominal incision with the resection of excess of skin. Our purpose is to evaluate the results of the procedure by incorporating these aspects into an epigastric hernia repair, we found out that the procedures are made safer and the results are improved. Proper indication and details of the technique are described.

  20. Grey Repairable System Analysis

    Institute of Scientific and Technical Information of China (English)

    Renkuan Guo; Charles Ernie Love

    2006-01-01

    In this paper, we systematically discuss the basic concepts of grey theory, particularly the grey differential equation and its mathematical foundation, which is essentially unknown in the reliability engineering community. Accordingly,we propose a small-sample based approach to estimate repair improvement effects by partitioning system stopping times into intrinsic functioning times and repair improvement times. An industrial data set is used for illustrative purposes in a stepwise manner.

  1. Assessing the Potential for Salmon Recovery via Floodplain Restoration: A Multitrophic Level Comparison of Dredge-Mined to Reference Segments

    Science.gov (United States)

    Bellmore, J. Ryan; Baxter, Colden V.; Ray, Andrew M.; Denny, Lytle; Tardy, Kurt; Galloway, Evelyn

    2012-03-01

    Pre-restoration studies typically focus on physical habitat, rather than the food-base that supports aquatic species. However, both food and habitat are necessary to support the species that habitat restoration is frequently aimed at recovering. Here we evaluate if and how the productivity of the food-base that supports fish production is impaired in a dredge-mined floodplain within the Yankee Fork Salmon River (YFSR), Idaho (USA); a site where past restoration has occurred and where more has been proposed to help recover anadromous salmonids. Utilizing an ecosystem approach, we found that the dredged segment had comparable terrestrial leaf and invertebrate inputs, aquatic primary producer biomass, and production of aquatic invertebrates relative to five reference floodplains. Thus, the food-base in the dredged segment did not necessarily appear impaired. On the other hand, we observed that off-channel aquatic habitats were frequently important to productivity in reference floodplains, and the connection of these habitats in the dredged segment via previous restoration increased invertebrate productivity by 58%. However, using a simple bioenergetic model, we estimated that the invertebrate food-base was at least 4× larger than present demand for food by fish in dredged and reference segments. In the context of salmon recovery efforts, this observation questions whether additional food-base productivity provided by further habitat restoration would be warranted in the YFSR. Together, our findings highlight the importance of studies that assess the aquatic food-base, and emphasize the need for more robust ecosystem models that evaluate factors potentially limiting fish populations that are the target of restoration.

  2. Environmental impact and recovery at two dumping sites for dredged material in the North Sea.

    Science.gov (United States)

    Stronkhorst, J; Ariese, F; van Hattum, B; Postma, J F; de Kluijver, M; Den Besten, P J; Bergman, M J N; Daan, R; Murk, A J; Vethaak, A D

    2003-01-01

    The environmental impact and recovery associated with the long and uninterrupted disposal of large volumes of moderately contaminated dredged material from the port of Rotterdam was studied at nearby dumping sites in the North Sea. Observations were made on sediment contamination, ecotoxicity, biomarker responses and benthic community changes shortly after dumping at the 'North' site had ceased and at the start of disposal at the new dumping site 'Northwest'. During the period of dumping, very few benthic invertebrates were found at the North site. Concentrations of cadmium, mercury, polychlorinated biphenyls (PCBs), polyaromatic hydrocarbons (PAHs) and tributyltin (TBT) in the fine sediment fraction (<63 microm) from this site were 2-3 times higher than at the reference site. In four different bioassays with marine invertebrates the sediments showed no acute toxic effects. In tissue (pyloric caeca) of resident starfish Asterias rubens, residual levels of mercury, zinc, PCBs and dioxin-like activity were never more than twice those at the reference site. Four different biomarkers (DNA integrity, cytochrome P450 content, benzo[a]pyrene hydroxylase activity and acetylcholinesterase inhibition) were used on the starfish tissues, but no significant differences were found between North and the reference site. Minor pathological effects were observed in resident dab Limanda limanda. One year after dumping had ceased at the North site, a significant increase in the species richness and abundance of benthic invertebrates and a concomitant decrease in the fine sediment fraction of the seabed were observed. After 8.2 million m3 of moderately contaminated dredged material had been dumped at the new dumping site Northwest, the species richness and abundance of benthic invertebrates declined over an area extending about 1-2 km eastwards. This correlated with a shift in sediment texture from sand to silt. The contamination of the fine sediment fraction at the Northwest location

  3. Environmental impact and recovery at two dumping sites for dredged material in the North Sea

    Energy Technology Data Exchange (ETDEWEB)

    Stronkhorst, J.; Ariese, F.; Hattum, B. van; Postma, J.F.; Kluijver, M. de; Besten, P.J. den; Bergman, M.J.N.; Daan, R.; Murk, A.J.; Vethaak, A.D

    2003-07-01

    Marine benthic resources near dumping sites are adversely affected by physical disturbances, but a causal link to contaminant damage could not be found. - The environmental impact and recovery associated with the long and uninterrupted disposal of large volumes of moderately contaminated dredged material from the port of Rotterdam was studied at nearby dumping sites in the North Sea. Observations were made on sediment contamination, ecotoxicity, biomarker responses and benthic community changes shortly after dumping at the 'North' site had ceased and at the start of disposal at the new dumping site 'Northwest'. During the period of dumping, very few benthic invertebrates were found at the North site. Concentrations of cadmium, mercury, polychlorinated biphenyls (PCBs), polyaromatic hydrocarbons (PAHs) and tributyltin (TBT) in the fine sediment fraction (<63 {mu}m) from this site were 2-3 times higher than at the reference site. In four different bioassays with marine invertebrates the sediments showed no acute toxic effects. In tissue (pyloric caeca) of resident starfish Asterias rubens, residual levels of mercury, zinc, PCBs and dioxin-like activity were never more than twice those at the reference site. Four different biomarkers (DNA integrity, cytochrome P450 content, benzo[a]pyrene hydroxylase activity and acetylcholinesterase inhibition) were used on the starfish tissues, but no significant differences were found between North and the reference site. Minor pathological effects were observed in resident dab Limanda limanda. One year after dumping had ceased at the North site, a significant increase in the species richness and abundance of benthic invertebrates and a concomitant decrease in the fine sediment fraction of the seabed were observed. After 8.2 million m{sup 3} of moderately contaminated dredged material had been dumped at the new dumping site Northwest, the species richness and abundance of benthic invertebrates declined over an

  4. Laparoscopic repair of left lumbar hernia after laparoscopic left nephrectomy.

    Science.gov (United States)

    Gagner, Michel; Milone, Luca; Gumbs, Andrew; Turner, Patricia

    2010-01-01

    Lumbar hernias, rarely seen in clinical practice, can be acquired after open or laparoscopic flank surgery. We describe a successful laparoscopic preperitoneal mesh repair of multiple trocar-site hernias after extraperitoneal nephrectomy. All the key steps including creating a peritoneal flap, reducing the hernia contents, and fixation of the mesh are described. A review of the literature on this infrequent operation is presented. Laparoscopic repair of lumbar hernias has all the advantages of laparoscopic ventral hernia repair.

  5. Impact of dredging on water quality and group diversity of marine zooplankton during construction and reclaimation activities of new berths at Mormugao Harbour, Goa.

    Digital Repository Service at National Institute of Oceanography (India)

    Snigdha

    . This coast has some of the finest harbours along the eastern and western margins. Mormugao Harbour (Plate 1) is one of the important ports along the west coast of India. A total of 11 berths with modern facilities are operational at the Mormugao Port... to be carried out at regular intervals. In addition to this, modernization of births or construction of new births also demands dredging operations. 9 Plate-1 : Mormugao Harbour 10 What is Dredging? Dredging is the process of removing material (sediment, debris...

  6. Hypospadias Repair: A Single Centre Experience

    Directory of Open Access Journals (Sweden)

    Mansoor Khan

    2014-01-01

    Full Text Available Objectives. To determine the demographics and analyze the management and factors influencing the postoperative complications of hypospadias repair. Settings. Hayatabad Medical Complex Peshawar, Pakistan, from January 2007 to December 2011. Material and Methods. All male patients presenting with hypospadias irrespective of their ages were included in the study. The data were acquired from the hospital’s database and analyzed with Statistical Package for Social Sciences (SPSS. Results. A total of 428 patients with mean age of 8.12 ± 5.04 SD presented for hypospadias repair. Midpenile hypospadias were the most common. Chordee, meatal abnormalities, cryptorchidism, and inguinal hernias were observed in 74.3%, 9.6%, 2.8%, and 2.1% cases, respectively. Two-stage (Bracka and TIP (tubularized incised urethral plate repairs were performed in 76.2% and 20.8% of cases, respectively. The most common complications were edema and urethrocutaneous fistula (UCF. The complications were significantly lower in the hands of specialists than residents (P-value = 0.0086. The two-stage hypospadias repair resulted in higher complications frequency than single-stage repair (P value = 0.0001. Conclusion. Hypospadias surgery has a long learning curve because it requires a great deal of temperament, surgical skill and acquaintance with magnifications. Single-stage repair should be encouraged wherever applicable due to its lower postoperative complications.

  7. Schwann cells for spinal cord repair

    Directory of Open Access Journals (Sweden)

    Oudega M.

    2005-01-01

    Full Text Available The complex nature of spinal cord injury appears to demand a multifactorial repair strategy. One of the components that will likely be included is an implant that will fill the area of lost nervous tissue and provide a growth substrate for injured axons. Here we will discuss the role of Schwann cells (SCs in cell-based, surgical repair strategies of the injured adult spinal cord. We will review key studies that showed that intraspinal SC grafts limit injury-induced tissue loss and promote axonal regeneration and myelination, and that this response can be improved by adding neurotrophic factors or anti-inflammatory agents. These results will be compared with several other approaches to the repair of the spinal cord. A general concern with repair strategies is the limited functional recovery, which is in large part due to the failure of axons to grow across the scar tissue at the distal graft-spinal cord interface. Consequently, new synaptic connections with spinal neurons involved in motor function are not formed. We will highlight repair approaches that did result in growth across the scar and discuss the necessity for more studies involving larger, clinically relevant types of injuries, addressing this specific issue. Finally, this review will reflect on the prospect of SCs for repair strategies in the clinic.

  8. Ecological evaluation of proposed dredged material from Richmond Harbor Deepening Project and the intensive study of the Turning Basin

    Energy Technology Data Exchange (ETDEWEB)

    Pinza, M.R.; Mayhew, H.L.; Karle, L.M.; Kohn, N.P.; White, P.J.; Word, J.Q.; Michaels, L.L. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1995-06-01

    Richmond Harbor is on the eastern shoreline of central San Francisco Bay and its access channels and several of the shipping berths are no longer wide or deep enough to accommodate modem deeper-draft vessels. The Water Resources Development Act of 1986 (PL99-662) authorized the US Army Corps of Engineers (USACE), San Francisco District to deepen and widen the navigation channels in Richmond Harbor. Several options for disposal of the material from this dredging project are under consideration by USACE: disposal within San Francisco Bay, at open-ocean disposal sites, or at uplands disposal sites. Purpose of this study was to conduct comprehensive evaluations, including chemical, biological, and bioaccumulation testing of sediments in selected areas of Richmond Harbor. This information was required by the Environmental Protection Agency (EPA) and USACE. Battelle/Marine Sciences Laboratory collected 20 core samples, both 4-in. and 12-in., to a project depth of -40 ft mean lower low water (MLLW) (-38 ft MLLW plus 2 ft of overdepth) using a vibratory-hammer core. These 20 field samples were combined to form five test composites plus an older bay mud (OBM) composite that were analyzed for physical/chemical parameters, biological toxicity, and tissue chemistry. Solid-phase tests were conducted with the amphipod, Rhepoxynius abronius; the clam, Macoma nasuta; and the polychaete worm, Nephtys caecoides. Suspended-particulate-phase (SPP) tests were conducted with the sanddab, Citharichthys stigmaeus; the mysid, Holmesimysis costata; and the bivalve, Mytilus galloprovincialis. Bioaccumulation of contaminants was measured in tissues of Macoma nasuta and Nereis virens. Sediments from one ocean reference sediment, and two in-bay reference sediments, were tested concurrently. Results from analysis of the five test treatments were statistically compared with the reference sediment R-OS in the first five sections of this report.

  9. Ecological evaluation of proposed dredged material from Richmond Harbor Deepening Project and the intensive study of the Turning Basin

    Energy Technology Data Exchange (ETDEWEB)

    Pinza, M.R.; Mayhew, H.L.; Karle, L.M.; Kohn, N.P.; White, P.J.; Word, J.Q.; Michaels, L.L. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1995-06-01

    Richmond Harbor is on the eastern shoreline of central San Francisco Bay and its access channels and several of the shipping berths are no longer wide or deep enough to accommodate modem deeper-draft vessels. The Water Resources Development Act of 1986 (PL99-662) authorized the US Army Corps of Engineers (USACE), San Francisco District to deepen and widen the navigation channels in Richmond Harbor. Several options for disposal of the material from this dredging project are under consideration by USACE: disposal within San Francisco Bay, at open-ocean disposal sites, or at uplands disposal sites. Purpose of this study was to conduct comprehensive evaluations, including chemical, biological, and bioaccumulation testing of sediments in selected areas of Richmond Harbor. This information was required by the Environmental Protection Agency (EPA) and USACE. Battelle/Marine Sciences Laboratory collected 20 core samples, both 4-in. and 12-in., to a project depth of -40 ft mean lower low water (MLLW) (-38 ft MLLW plus 2 ft of overdepth) using a vibratory-hammer core. These 20 field samples were combined to form five test composites plus an older bay mud (OBM) composite that were analyzed for physical/chemical parameters, biological toxicity, and tissue chemistry. Solid-phase tests were conducted with the amphipod, Rhepoxynius abronius; the clam, Macoma nasuta; and the polychaete worm, Nephtys caecoides. Suspended-particulate-phase (SPP) tests were conducted with the sanddab, Citharichthys stigmaeus; the mysid, Holmesimysis costata; and the bivalve, Mytilus galloprovincialis. Bioaccumulation of contaminants was measured in tissues of Macoma nasuta and Nereis virens. Sediments from one ocean reference sediment, and two in-bay reference sediments, were tested concurrently. Results from analysis of the five test treatments were statistically compared with the reference sediment R-OS in the first five sections of this report.

  10. DNA repair in species with extreme lifespan differences

    Science.gov (United States)

    MacRae, Sheila L.; Croken, Matthew McKnight; Calder, R.B.; Aliper, Alexander; Milholland, Brandon; White, Ryan R.; Zhavoronkov, Alexander; Gladyshev, Vadim N.; Seluanov, Andrei; Gorbunova, Vera; Zhang, Zhengdong D.; Vijg, Jan

    2015-01-01

    Differences in DNA repair capacity have been hypothesized to underlie the great range of maximum lifespans among mammals. However, measurements of individual DNA repair activities in cells and animals have not substantiated such a relationship because utilization of repair pathways among animals—depending on habitats, anatomical characteristics, and life styles—varies greatly between mammalian species. Recent advances in high-throughput genomics, in combination with increased knowledge of the genetic pathways involved in genome maintenance, now enable a comprehensive comparison of DNA repair transcriptomes in animal species with extreme lifespan differences. Here we compare transcriptomes of liver, an organ with high oxidative metabolism and abundant spontaneous DNA damage, from humans, naked mole rats, and mice, with maximum lifespans of ∼120, 30, and 3 years, respectively, with a focus on genes involved in DNA repair. The results show that the longer-lived species, human and naked mole rat, share higher expression of DNA repair genes, including core genes in several DNA repair pathways. A more systematic approach of signaling pathway analysis indicates statistically significant upregulation of several DNA repair signaling pathways in human and naked mole rat compared with mouse. The results of this present work indicate, for the first time, that DNA repair is upregulated in a major metabolic organ in long-lived humans and naked mole rats compared with short-lived mice. These results strongly suggest that DNA repair can be considered a genuine longevity assurance system. PMID:26729707

  11. Estimating seabed pressure from demersal trawls, seines, and dredges based on gear design and dimensions

    DEFF Research Database (Denmark)

    Eigaard, Ole Ritzau; Bastardie, Francois; Breen, Mike

    2016-01-01

    This study assesses the seabed pressure of towed fishing gears and models the physical impact (area and depth of seabed penetration) from trip-based information of vessel size, gear type, and catch. Traditionally fishing pressures are calculated top-down by making use of large-scale statistics...... trawl groups, two demersal seine groups, and one dredge group), for which we established gear “footprints”. The footprint of a gear is defined as the relative contribution from individual larger gear components, such as trawl doors, sweeps, and groundgear, to the total area and severity of the gear......'s impact. An industry-based survey covering 13 countries provided the basis for estimating the relative impact-area contributions from individual gear components, whereas sediment penetration was estimated based on a literature review. For each gear group, a vessel size–gear size relationship was estimated...

  12. Evaluation of dredged material proposed for ocean disposal from Gravesend Bay Anchorage, New York

    Energy Technology Data Exchange (ETDEWEB)

    Barrows, E.S.; Gruendell, B.D. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1996-09-01

    The Gravesend Bay Anchorage was one of seven waterways that the US Army Corps of Engineers-New York District (USACE-NYD) requested the Battelle Marine Sciences Laboratory (MSL) to sample and evaluate for dredging and disposal in February 1994. Sediment samples were submitted for physical and chemical analyses to provide baseline sediment chemistry data on the Gravesend Bay Anchorage. Individual sediment core samples collected at the Gravesend Bay Anchorage were analyzed for grain size, moisture content, and total organic carbon (TOC). Two samples, one of composited sediment cores representing the southeast corner of the anchorage (COMP GR), and one sediment core representing the northeast corner of the anchorage (Station GR-1 0), were analyzed for bulk density, specific gravity, metals, chlorinated pesticides, polychlorinated biphenyl (PCB) congeners, polynuclear aromatic hydrocarbons (PAH), and 1,4-dichlorobenzene.

  13. Estimation of seafloor impact from demersal trawls, seines and dredges based on gear design and dimensions

    DEFF Research Database (Denmark)

    Eigaard, Ole Ritzau; Bastardie, Francois; Breen, Michael

    a different approach using the gear itself (design and dimensions) for understanding and estimation of the physical interactions with the seafloor at the individual fishing operation level. With reference to the métier groupings of EU logbooks, we defined 17 distinct towed gear groups in European waters (11...... otter trawl groups, 3 beam trawl groups, 2 demersal seine groups, and 1 dredge group), for which we established seafloor “footprints”. The footprint of a gear was defined as the relative contribution from individual larger gear components, such as the trawl doors, sweeps and ground gear, to the total...... types based on a review of the scientific literature. For each defined gear group a vessel-size (kW or total length) – gear size (total gear width or circumference) relationship was estimated to enable the prediction of gear footprint area and sediment penetration from vessel size. The implications...

  14. Formulation of artificial aggregates from dredged harbour sediments for coastline stabilization.

    Science.gov (United States)

    Brakni, Samira; Abriak, Nor Edine; Hequette, Arnaud

    2009-07-01

    Coastal erosion is a common phenomenon along the shores of the member states of the European Union. In 2004, approximately 20,000 km of coastlines, accounting for 20% of the whole of the EU coastline, were considered particularly affected by this phenomenon. Coastal erosion and shoreline retreat already affect a significant proportion of the French coast, the beaches in the north of France being no exception, and will probably increase during the 21st Century because of climate change. Because erosion is often accentuated by sedimentary deficits, artificial beach replenishment often represents an appropriate engineering solution for coastline stabilization. Meanwhile, large quantities of sediments are dredged every year from ports, with approximately 25 to 45 million tons of sediments (dry matter) per year being dredged for the maintenance of harbours. The purpose of the study presented in this article is to report on the potential use of artificial aggregates formulated with harbour sediments in order to recharge beaches and/or nearshore environments. The manufacture of the aggregates consisted of several stages, beginning with the characterization and the preparation of the sediment before the fabrication of aggregates by extrusion, associating the sediments with a specific hydraulic binder. Various parameters, such as water content of the mixing sediment, the cement content and the shape of the aggregates, were taken into account, in order to ensure the criteria regarding the strength of these aggregates are entirely fulfilled. The first simulations in a wave flume are encouraging and reveal the possibilities for use of the aggregates in coastal engineering.

  15. Trace elements in soil and biota in confined disposal facilities for dredged material

    Science.gov (United States)

    Beyer, W.N.; Miller, G.; Simmers, J.W.

    1990-01-01

    We studied the relation of trace element concentrations in soil to those in house mice (Mus musculus), common reed (Phragmites australis) and ladybugs (Coccinella septempunctata) at five disposal facilities for dredged material. The sites had a wide range of soil trace element concentrations, acid soils and a depauperate fauna. They were very poor wildlife habitat because they were dominated by the common reed. Bioassay earthworms exposed to surface soils from three of the five sites died, whereas those exposed to four of five soils collected a meter deep survived, presumably because the deeper, unoxidized soil, was not as acid. Concentrations of Ni and Cr in the biota from each of the sites did not seem to be related to the concentrations of the same elements in soil. Although Pb, Zn and Cu concentrations in biota were correlated with those in soil, the range of concentrations in the biota was quite small compared to that in soil. The concentrations of Pb detected in mice were about as high as the concentrations previously reported in control mice from other studies. Mice from the most contaminated site (530 ppm Pb in soil) contained only slightly more Pb (8 ppm dry wt) than did mice (2-6 ppm dry wt) from sites containing much less Pb (22-92 ppm in soil). Despite the acid soil conditions, very little Cd was incorporated into food chains. Rather, Cd was leaching from the surface soil. We concluded that even the relatively high concentrations of trace elements in the acid dredged material studied did not cause high, concentrations of trace elements in the biota.

  16. Trace elements in soil and biota in confined disposal facilities for dredged material.

    Science.gov (United States)

    Beyer, W N; Miller, G; Simmers, J W

    1990-01-01

    We studied the relation of trace element concentrations in soil to those in house mice (Mus musculus), common reed (Phragmites australis) and ladybugs (Coccinella septempunctata at five disposal facilities for dredged material. The sites had a wide range of soil trace element concentrations, acid soils and a depauperate fauna. They were very poor wildlife habitat because they were dominated by the common reed. Bioassay earthworms exposed to surface soils from three of the five sites died, whereas those exposed to four of five soils collected a meter deep survived, presumably because the deeper, unoxidized soil, was not as acid. Concentrations of Ni and Cr in the biota from each of the sites did not seem to be related to the concentrations of the same elements in soil. Although Pb, Zn and Cu concentrations in biota were correlated with those in soil, the range of concentrations in the biota was quite small compared to that in soil. The concentrations of Pb detected in mice were about as high as the concentrations previously reported in control mice from other studies. Mice from the most contaminated site (530 ppm Pb in soil) contained only slightly more Pb (8 ppm dry wt) than did mice (2-6 ppm dry wt) from sites containing much less Pb (22-92 ppm in soil). Despite the acid soil conditions, very little Cd was incorporated into food chains. Rather, Cd was leaching from the surface soil. We concluded that even the relatively high concentrations of trace elements in the acid dredged material studied did not cause high concentrations of trace elements in the biota.

  17. The impact of heterochromatin on DSB repair.

    Science.gov (United States)

    Goodarzi, Aaron A; Noon, Angela T; Jeggo, Penny A

    2009-06-01

    DNA NHEJ (non-homologous end-joining) is the major DNA DSB (double-strand break) repair pathway in mammalian cells. Although NHEJ-defective cell lines show marked DSB-repair defects, cells defective in ATM (ataxia telangiectasia mutated) repair most DSBs normally. Thus NHEJ functions independently of ATM signalling. However, approximately 15% of radiation-induced DSBs are repaired with slow kinetics and require ATM and the nuclease Artemis. DSBs persisting in the presence of an ATM inhibitor, ATMi, localize to heterochromatin, suggesting that ATM is required for repairing DSBs arising within or close to heterochromatin. Consistent with this, we show that siRNA (small interfering RNA) of key heterochromatic proteins, including KAP-1 [KRAB (Krüppel-associated box) domain-associated protein 1], HP1 (heterochromatin protein 1) and HDAC (histone deacetylase) 1/2, relieves the requirement for ATM for DSB repair. Furthermore, ATMi addition to cell lines with genetic alterations that have an impact on heterochromatin, including Suv39H1/2 (suppressor of variegation 3-9 homologue 1/2)-knockout, ICFa (immunodeficiency, centromeric region instability, facial anomalies syndrome type a) and Hutchinson-Guilford progeria cell lines, fails to have an impact on DSB repair. KAP-1 is a highly dose-dependent, transient and ATM-specific substrate, and mutation of the ATM phosphorylation site on KAP-1 influences DSB repair. Collectively, the findings show that ATM functions to overcome the barrier to DSB repair posed by heterochromatin. However, even in the presence of ATM, gamma-H2AX (phosphorylated histone H2AX) foci form on the periphery rather than within heterochromatic centres. Finally, we show that KAP-1's association with heterochromatin is diminished as cells progress through mitosis. We propose that KAP-1 is a critical heterochromatic factor that undergoes specific modifications to promote DSB repair and mitotic progression in a manner that allows localized and transient

  18. Outcomes After Emergency Versus Elective Ventral Hernia Repair

    DEFF Research Database (Denmark)

    Helgstrand, Frederik; Rosenberg, Jacob; Kehlet, Henrik;

    2013-01-01

    BACKGROUND: Early surgical results after emergency repairs for the most frequent ventral hernias (epigastric, umbilical, and incisional) are not well described. Thus, the aim of present study was to investigate early results and risk factors for poor 30-day outcome after emergency versus elective...... repair for ventral hernias. METHODS: All patients undergoing epigastric, umbilical, or incisional hernia repair registered in the Danish Hernia Database during the period 1 January 2007 to 31 December 2010 were included in the prospective study. Follow-up was obtained through administrative data from...... significantly more patients with concomitant bowel resection after emergency repairs than after elective repairs (p 2-7 cm, and repair for a primary hernia (vs recurrent hernia) (all p ...

  19. Detecting and Correcting Speech Repairs

    CERN Document Server

    Heeman, P A; Heeman, Peter; Allen, James

    1994-01-01

    Interactive spoken dialog provides many new challenges for spoken language systems. One of the most critical is the prevalence of speech repairs. This paper presents an algorithm that detects and corrects speech repairs based on finding the repair pattern. The repair pattern is built by finding word matches and word replacements, and identifying fragments and editing terms. Rather than using a set of prebuilt templates, we build the pattern on the fly. In a fair test, our method, when combined with a statistical model to filter possible repairs, was successful at detecting and correcting 80\\% of the repairs, without using prosodic information or a parser.

  20. Primary repair of colon injuries: clinical study of nonselective approach

    Directory of Open Access Journals (Sweden)

    Krivokapic Zoran V

    2010-12-01

    Full Text Available Abstract Background This study was designed to determine the role of primary repair and to investigate the possibility of expanding indications for primary repair of colon injuries using nonselective approach. Methods Two groups of patients were analyzed. Retrospective (RS group included 30 patients managed by primary repair or two stage surgical procedure according to criteria published by Stone (S/F and Flint (Fl. In this group 18 patients were managed by primary repair. Prospective (PR group included 33 patients with primary repair as a first choice procedure. In this group, primary repair was performed in 30 cases. Results Groups were comparable regarding age, sex, and indexes of trauma severity. Time between injury and surgery was shorter in PR group, (1.3 vs. 3.1 hours. Stab wounds were more frequent in PR group (9:2, and iatrogenic lesions in RS group (6:2. Associated injuries were similar, as well as segmental distribution of colon injuries. S/F criteria and Flint grading were similar. In RS group 15 primary repairs were successful, while in two cases relaparotomy and colostomy was performed due to anastomotic leakage. One patient died. In PR group, 25 primary repairs were successful, with 2 immediate and 3 postoperative (7-10 days deaths, with no evidence of anastomotic leakage. Conclusions Results of this study justify more liberal use of primary repair in early management of colon injuries. Trial registration Current Controlled Trials ISRCTN94682396

  1. 湖泊疏浚堆场淤泥污染及潜在生态风险评价∗%Distribution and potential ecological risk assessments of contaminants insludge in dredged sediments landfill sites

    Institute of Scientific and Technical Information of China (English)

    刘敏; 钟继承; 余居华; 郑小兰; 范成新

    2016-01-01

    疏浚淤泥内通常含有不同类型的有毒有害物质,在堆场直接堆放过程中可能会对周围环境产生有害影响。本文针对太湖及巢湖相应疏浚堆场内淤泥进行研究,探讨淤泥中重金属、多环芳烃以及多氯联苯等污染物含量及潜在生态风险;根据重金属的风险指数法和持久性有机污染物的风险商法,对各污染物的潜在生态风险进行定量分析。研究结果表明,太湖白旄堆场以及孔湾堆场淤泥内重金属及多环芳烃含量较小,潜在生态风险较低;巢湖南庄堆场淤泥内各类有害物质含量较大,种类较多,对于周围环境具有较高的潜在生态威胁。多氯联苯则在各个疏浚堆场淤泥中具有很高的积累量,潜在生态风险较高,应引起管理者的重视。%Direct disposal of dredged sediments in landfill sites may possess potential ecological risks to environment as they are a⁃bundant in contaminant. An experiment was conducted to analysis the concentrations and potential ecological risks of different con⁃taminants including heavy metals, polycyclic aromatic hydrocarbons(PAHs) and polychlorinated biphenyls(PCBs) in dredged sediment landfill sites in Lake Taihu and Lake Chaohu in China. According to the potential ecological risk assessments of heavy metals and risk quotients of persistent organic pollutants, the potential ecological risks of different contaminants were quantified. Results illustrate that potential ecological risks of dredged sediments are relatively low in landfill sites in Lake Taihu, while are con⁃siderable in Lake Chaohu. In addition, the high accumulations of PCBs in dredged sediments possess high potential ecological risks to environment, and need more attention from managers.

  2. Completion Acceptance and Measurement Technology of Channel Dredging Project%航道疏浚工程竣工验收测量技术研究

    Institute of Scientific and Technical Information of China (English)

    李敬; 肖毅宏

    2013-01-01

    疏浚工程是否达到设计标准,对工程社会效益和经济效益有重要意义.本文从航道疏浚工程竣工验测量需求入手,就航道疏浚工程竣工验收测量技术进行了探讨.%If the dredging project meets the design standards or not has important social and economic benefits of the project. This article, from the needs of acceptance measurement to the channel dredging project, discussed the completion acceptance and measurement technology of channel dredging project experience acceptance measurement to start the channel dredging project.

  3. Repair of DNA Double-Strand Breaks

    Science.gov (United States)

    Falk, Martin; Lukasova, Emilie; Kozubek, Stanislav

    The genetic information of cells continuously undergoes damage induced by intracellular processes including energy metabolism, DNA replication and transcription, and by environmental factors such as mutagenic chemicals and UV and ionizing radiation. This causes numerous DNA lesions, including double strand breaks (DSBs). Since cells cannot escape this damage or normally function with a damaged genome, several DNA repair mechanisms have evolved. Although most "single-stranded" DNA lesions are rapidly removed from DNA without permanent damage, DSBs completely break the DNA molecule, presenting a real challenge for repair mechanisms, with the highest risk among DNA lesions of incorrect repair. Hence, DSBs can have serious consequences for human health. Therefore, in this chapter, we will refer only to this type of DNA damage. In addition to the biochemical aspects of DSB repair, which have been extensively studied over a long period of time, the spatio-temporal organization of DSB induction and repair, the importance of which was recognized only recently, will be considered in terms of current knowledge and remaining questions.

  4. 14 CFR 151.97 - Maintenance and repair.

    Science.gov (United States)

    2010-01-01

    ... or improper design; (4) Painting of buildings (inside and outside) and replacement of damaged items... and resealing surface of pavements. (b) Repair includes any work not included in paragraph (a) of...

  5. DNA Mismatch Repair and Oxidative DNA Damage: Implications for Cancer Biology and Treatment

    Energy Technology Data Exchange (ETDEWEB)

    Bridge, Gemma; Rashid, Sukaina; Martin, Sarah A., E-mail: sarah.martin@qmul.ac.uk [Centre for Molecular Oncology, Barts Cancer Institute, Queen Mary University of London, Charterhouse Square, London EC1M 6BQ (United Kingdom)

    2014-08-05

    Many components of the cell, including lipids, proteins and both nuclear and mitochondrial DNA, are vulnerable to deleterious modifications caused by reactive oxygen species. If not repaired, oxidative DNA damage can lead to disease-causing mutations, such as in cancer. Base excision repair and nucleotide excision repair are the two DNA repair pathways believed to orchestrate the removal of oxidative lesions. However, recent findings suggest that the mismatch repair pathway may also be important for the response to oxidative DNA damage. This is particularly relevant in cancer where mismatch repair genes are frequently mutated or epigenetically silenced. In this review we explore how the regulation of oxidative DNA damage by mismatch repair proteins may impact on carcinogenesis. We discuss recent studies that identify potential new treatments for mismatch repair deficient tumours, which exploit this non-canonical role of mismatch repair using synthetic lethal targeting.

  6. Evaluation of New Repair Methods for Seal Surface Defects on Reusable Solid Rocket Motor (RSRM) Hardware

    Science.gov (United States)

    Stanley, Stephanie; Selvidge, Shawn

    2003-01-01

    The focus of the evaluation was to develop a back-up method to cell plating for the improvement or repair of seal surface defects within D6-AC steel and 7075-T73 aluminum used in the RSRM program. Several techniques were investigated including thermal and non-thermal based techniques. Ideally the repair would maintain the inherent properties of the substrate without losing integrity at the repair site. The repaired sites were tested for adhesion, corrosion, hardness, microhardness, surface toughness, thermal stability, ability to withstand bending of the repair site, and the ability to endure a high-pressure water blast without compromising the repaired site. The repaired material could not change the inherent properties of the substrate throughout each of the test in order to remain a possible technique to repair the RSRM substrate materials. One repair method, Electro-Spark Alloying, passed all the testing and is considered a candidate for further evaluation.

  7. Reoperation Rates for Laparoscopic vs Open Repair of Femoral Hernias in Denmark

    DEFF Research Database (Denmark)

    Andresen, Kristoffer; Bisgaard, Thue; Kehlet, Henrik

    2014-01-01

    IMPORTANCE: In Denmark approximately 10 000 groin hernias are repaired annually, of which 2% to 4% are femoral hernias. Several methods for repair of femoral hernias are used including sutured repair and different types of mesh repair with either open or laparoscopic techniques. The use of many...... laparoscopic vs open femoral hernia repair, analyzing data from a nationwide database. DESIGN, SETTING, AND PARTICIPANTS: A prospective cohort study was conducted. Data on femoral hernia repairs registered in the Danish Hernia Database from January 1998 until February 2012 were extracted and analyzed. All...... repairs were followed in the database and analyzed for reports of reoperation, which were used as a proxy for recurrence. Femoral hernia recurrence and inguinal hernia occurrence after the index repair were analyzed. EXPOSURE: Repair of a femoral hernia. MAIN OUTCOMES AND MEASURES: Reoperation...

  8. Ocean Dredged Material Disposal Site (ODMDS) Authorization and Short-Term FATE (STFATE) Model Analysis: 2014-2015 Working Group Findings Report

    Science.gov (United States)

    2016-03-01

    Development Center (ERDC) solves the nation’s toughest engineering and environmental challenges. ERDC develops innovative solutions in civil and military...Shirey of the Charleston District (CESAC); John W. Bearce, Rebecca Lee-Duffell, and Joelle Verhagen of the Jacksonville District (CESAJ); Jennifer...of time used to dump a scow or hopper dredge • partially opening bins or split hull for slower release and spreading of dredged material

  9. Standardized measurement of quality of life after incisional hernia repair

    DEFF Research Database (Denmark)

    Jensen, Kristian K; Henriksen, Nadia A; Harling, Henrik

    2014-01-01

    repair. The aim of this systematic review was to analyze existing standardized methods to measure quality of life after incisional hernia repair. DATA SOURCES: A PubMed and Embase search was carried out together with a cross-reference search of eligible papers, giving a total of 26 included studies...

  10. Quality electric motor repair: A guidebook for electric utilities

    Energy Technology Data Exchange (ETDEWEB)

    Schueler, V.; Douglass, J.

    1995-08-01

    This guidebook provides utilities with a resource for better understanding and developing their roles in relation to electric motor repair shops and the industrial and commercial utility customers that use them. The guidebook includes information and tools that utilities can use to raise the quality of electric motor repair practices in their service territories.

  11. Groin hernia repair in young males: mesh or sutured repair?

    DEFF Research Database (Denmark)

    Bisgaard, T; Bay-Nielsen, M; Kehlet, H

    2010-01-01

    Large-scale data for the optimal inguinal hernia repair in younger men with an indirect hernia is not available. We analysed nationwide data for risk of reoperation in younger men after a primary repair using a Lichtenstein operation or a conventional non-mesh hernia repair....

  12. Cleft lip and palate repair

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/article/002979.htm Cleft lip and palate repair To use the sharing features on this page, please enable JavaScript. Cleft lip and cleft palate repair is surgery to fix birth defects ...

  13. Abdominal aortic aneurysm repair - open

    Science.gov (United States)

    ... this page: //medlineplus.gov/ency/article/007392.htm Abdominal aortic aneurysm repair - open To use the sharing features on this page, please enable JavaScript. Open abdominal aortic aneurysm repair is surgery to fix a widened part ...

  14. Use of neutralized industrial residue to stabilize trace elements (Cu, Cd, Zn, As, Mo, and Cr) in marine dredged sediment from South-East of France.

    Science.gov (United States)

    Taneez, Mehwish; Marmier, Nicolas; Hurel, Charlotte

    2016-05-01

    Management of marine dredged sediments polluted with trace elements is prime issue in the French Mediterranean coast. The polluted sediments possess ecological threats to surrounding environment on land disposal. Therefore, stabilization of contaminants in multi-contaminated marine dredged sediment is a promising technique. Present study aimed to assess the effect of gypsum neutralized bauxaline(®) (bauxite residue) to decrease the availability of pollutants and inherent toxicity of marine dredged sediment. Bauxaline(®), (alumia industry waste) contains high content of iron oxide but its high alkalinity makes it not suitable for the stabilization of all trace elements from multi-contaminated dredged sediments. In this study, neutralized bauxaline(®) was prepared by mixing bauxaline(®) with 5% of plaster. Experiments were carried out for 3 months to study the effect of 5% and 20% amendment rate on the availability of Cu, Cd, Zn, As, Mo, and Cr. Trace elements concentration, pH, EC and dissolved organic carbon were measured in all leachates. Toxicity of leachates was assessed against marine rotifers Brachionus plicatilis. The Results showed that both treatments have immobilization capacity against different pollutants. Significant stabilization of contaminants (Cu, Cd, Zn) was achieved with 20% application rate whereas As, Mo, and Cr were slightly stabilized. Toxicity results revealed that leachates collected from treated sediment were less toxic than the control sediment. These results suggest that application of neutralized bauxaline(®) to dredged sediment is an effective approach to manage large quantities of dredged sediments as well as bauxite residue itself.

  15. Laparoscopic repair of large incisional hernias.

    Science.gov (United States)

    Parker, Harris H; Nottingham, James M; Bynoe, Raymond P; Yost, Michael J

    2002-06-01

    Incisional hernias after abdominal operations are a significant cause of long-term morbidity and have been reported to occur in 3 to 20 per cent of laparotomy incisions. Traditional primary suture closure repair is plagued with up to a 50 per cent recurrence rate. With the introduction of prosthetic mesh repair recurrence decreased, but complications with mesh placement emerged ushering in the development of laparoscopic incisional herniorrhaphy. The records of patients who underwent laparoscopic incisional hernia repair between June 1, 1995 and September 1, 2001 were reviewed. Patient demographics, hernia defect size, recurrence, operative time, and procedure-related complications were evaluated. Fifty patients (22 male and 28 female, mean age 57 years with range of 24-83) were scheduled for laparoscopic incisional hernia repair between June 1, 1995 and September 1, 2001. The average patient was obese with a mean body mass index of 35.8 kg/m2 (range 16-57 kg/m2). Two patients (4%) had primary ventral hernias. Forty-eight patients (96%) had incisional hernias with 22 (46%) of these previously repaired with prosthetic mesh. Mean defect size was 206.1 cm2 (range 48-594 cm2). The average mesh size was 510.2 cm2 (range 224-1050 cm2). Gore-Tex DualMesh and Bard Composite Mesh were used in 84 and 16 per cent of the repairs, respectively. Mean operating time was 97 minutes. There were no deaths. Complications were seen in 12 per cent patients (six occurrences) and included two small bowel enterotomies, a symptomatic seroma requiring aspirate, a mesh reaction requiring a short course of intravenous antibiotics, and trocar site pain (two patients). There were no recurrences during a mean follow-up of 41 months (range 3-74 months). We conclude that laparoscopic incisional herniorrhaphy offers a safe and effective repair for large primary and recurrent ventral hernia with low morbidity.

  16. Nanomaterials promise better bone repair

    OpenAIRE

    Qifei Wang; Jianhua Yan; Junlin Yang; Bingyun Li

    2016-01-01

    Nanomaterials mimicking the nano-features of bones and offering unique smart functions are promising for better bone fracture repair. This review provides an overview of the current state-of-the-art research in developing and using nanomaterials for better bone fracture repair. This review begins with a brief introduction of bone fracture repair processes, then discusses the importance of vascularization, the role of growth factors in bone fracture repair, and the failure of bone fracture rep...

  17. Laparoscopic repair of femoral hernia

    OpenAIRE

    Yang, Xue-Fei; Liu, Jia-Lin

    2016-01-01

    Laparoscopic repair of inguinal hernia is mini-invasive and has confirmed effects. Femoral hernia could be repaired through the laparoscopic procedures for inguinal hernia. These procedures have clear anatomic view in the operation and preoperatively undiagnosed femoral hernia could be confirmed and treated. Lower recurrence ratio was reported in laparoscopic procedures compared with open procedures for repair of femoral hernia. The technical details of laparoscopic repair of femoral hernia, ...

  18. Petrography and U-Pb detrital zircon geochronology of metasedimentary strata dredged from the Chukchi Borderland, Amerasia Basin, Arctic Ocean

    Science.gov (United States)

    Brumley, K.; Miller, E. L.; Mayer, L. A.; Andronikov, A.; Wooden, J. L.; Dumitru, T. A.; Elliott, B.; Gehrels, G. E.; Mukasa, S. B.

    2010-12-01

    In 2008-2009, twelve dredges were taken aboard the USCGC Healy from outcrops along the Alpha Ridge, Northern Chukchi Borderland, Northwind Ridge and the Chukchi Plateau in the Arctic Ocean as part of the U.S. Extended Continental Shelf Project. To ensure sampling of outcrop, steep bathymetric slopes (>40°) with little mud cover were identified with multibeam sonar and targeted for dredging. The first dredge from Alpha Ridge yielded volcaniclastic sedimentary rocks deposited from a phreatomagmatic eruption in shallow water (<200m). This is inconsistent with tectonic reconstructions suggesting that the Alpha Ridge was created as an oceanic plateau on deep oceanic crust of the Canada Basin. Another dredge, taken from the northern tip of Northwind Ridge, yielded metasedimentary rocks deformed under greenschist facies conditions (chlorite+white mica). These rocks are intruded and/or overlain by mid-Cretaceous alkalic basalts, also taken in this dredge, and dated by 40Ar/39Ar (plagioclase separate) to be 112±1 Ma. The metasedimentary rocks, from this single dredge, range in grain size from mud to coarse sandstone and grit which all contain grains and sub-angular clasts of volcanic, plutonic, metamorphic and fine grained sedimentary rocks as well as monocrystalline quartz, potassium feldspar, and plagioclase. All of these samples display the same bedding to foliation angle and lithology, which further indicates that they were dredged from in situ outcrop and are not random samples of ice rafted debris. Based on grain size variations and graded beds, they are interpreted as Silurian gravity flow deposits fed by proximal syn-orogenic and/or magmatic arc sources. Detrital zircons were separated from four sandstone samples of the Northwind Ridge dredge, and their U-Pb single grain ages determined by LA-MC-ICPMS and SHRIMP, (N= 393). Their detrital zircon populations are dominated by euhedral first-cycle zircon ca. 430 and 980 Ma with lesser older recycled zircons between

  19. Morphological Analyses and Simulated Flood Elevations in a Watershed with Dredged and Leveed Stream Channels, Wheeling Creek, Eastern Ohio

    Science.gov (United States)

    Sherwood, James M.; Huitger, Carrie A.; Ebner, Andrew D.; Koltun, G.F.

    2008-01-01

    The USGS, in cooperation with the Ohio Emergency Management Agency, conducted a study in the Wheeling Creek Basin to (1) evaluate and contrast land-cover characteristics from 2001 with characteristics from 1979 and 1992; (2) compare current streambed elevation, slope, and geometry with conditions present in the late 1980s; (3) look for evidence of channel filling and over widening in selected undredged reaches; (4) estimate flood elevations for existing conditions in both undredged and previously dredged reaches; (5) evaluate the height of the levees required to contain floods with selected recurrence intervals in previously dredged reaches; and (6) estimate flood elevations for several hypothetical dredging and streambed aggradation scenarios in undredged reaches. The amount of barren land in the Wheeling Creek watershed has decreased from 20 to 1 percent of the basin area based on land-cover characteristics from 1979 and 2001. Barren lands appear to have been converted primarily to pasture, presumably as a result of surface-mine reclamation. Croplands also decreased from 13 to 8 percent of the basin area. The combined decrease in barren lands and croplands is approximately offset by the increase in pasture. Stream-channel surveys conducted in 1987 and again in 2006 at 21 sites in four previously dredged reaches of Wheeling Creek indicate little change in the elevation, slope, and geometry of the channel at most sites. The mean change in width-averaged bed and thalweg elevations for the 21 cross sections was 0.1 feet. Bankfull widths, mean depths, and cross-sectional areas measured at 12 sites in undredged reaches were compared to estimates determined from regional equations. The mean percentage difference between measured and estimated bankfull widths was -0.2 percent, suggesting that bankfull widths in the Wheeling Creek Basin are generally about the same as regional averages for undisturbed basins of identical drainage area. For bankfull mean depth and cross

  20. DNA repair and radiation sensitivity in mammalian cells

    Energy Technology Data Exchange (ETDEWEB)

    Chen, D.J.C.; Stackhouse, M. [Los Alamos National Lab., NM (United States); Chen, D.S. [Rochester Univ., NY (United States). Dept. of Radiation Oncology

    1993-02-01

    Ionizing radiation induces various types of damage in mammalian cells including DNA single-strand breaks, DNA double-strand breaks (DSB), DNA-protein cross links, and altered DNA bases. Although human cells can repair many of these lesions there is little detailed knowledge of the nature of the genes and the encoded enzymes that control these repair processes. We report here on the cellular and genetic analyses of DNA double-strand break repair deficient mammalian cells. It has been well established that the DNA double-strand break is one of the major lesions induced by ionizing radiation. Utilizing rodent repair-deficient mutant, we have shown that the genes responsible for DNA double-strand break repair are also responsible for the cellular expression of radiation sensitivity. The molecular genetic analysis of DSB repair in rodent/human hybrid cells indicate that at least 6 different genes in mammalian cells are responsible for the repair of radiation-induced DNA double-strand breaks. Mapping and the prospect of cloning of human radiation repair genes are reviewed. Understanding the molecular and genetic basis of radiation sensitivity and DNA repair in man will provide a rational foundation to predict the individual risk associated with radiation exposure and to prevent radiation-induced genetic damage in the human population.

  1. DNA repair and radiation sensitivity in mammalian cells

    Energy Technology Data Exchange (ETDEWEB)

    Chen, D.J.C.; Stackhouse, M. (Los Alamos National Lab., NM (United States)); Chen, D.S. (Rochester Univ., NY (United States). Dept. of Radiation Oncology)

    1993-01-01

    Ionizing radiation induces various types of damage in mammalian cells including DNA single-strand breaks, DNA double-strand breaks (DSB), DNA-protein cross links, and altered DNA bases. Although human cells can repair many of these lesions there is little detailed knowledge of the nature of the genes and the encoded enzymes that control these repair processes. We report here on the cellular and genetic analyses of DNA double-strand break repair deficient mammalian cells. It has been well established that the DNA double-strand break is one of the major lesions induced by ionizing radiation. Utilizing rodent repair-deficient mutant, we have shown that the genes responsible for DNA double-strand break repair are also responsible for the cellular expression of radiation sensitivity. The molecular genetic analysis of DSB repair in rodent/human hybrid cells indicate that at least 6 different genes in mammalian cells are responsible for the repair of radiation-induced DNA double-strand breaks. Mapping and the prospect of cloning of human radiation repair genes are reviewed. Understanding the molecular and genetic basis of radiation sensitivity and DNA repair in man will provide a rational foundation to predict the individual risk associated with radiation exposure and to prevent radiation-induced genetic damage in the human population.

  2. Repair of overheating linear accelerator

    Energy Technology Data Exchange (ETDEWEB)

    Barkley, Walter; Baldwin, William; Bennett, Gloria; Bitteker, Leo; Borden, Michael; Casados, Jeff; Fitzgerald, Daniel; Gorman, Fred; Johnson, Kenneth; Kurennoy, Sergey; Martinez, Alberto; O’Hara, James; Perez, Edward; Roller, Brandon; Rybarcyk, Lawrence; Stark, Peter; Stockton, Jerry

    2004-01-01

    Los Alamos Neutron Science Center (LANSCE) is a proton accelerator that produces high energy particle beams for experiments. These beams include neutrons and protons for diverse uses including radiography, isotope production, small feature study, lattice vibrations and material science. The Drift Tube Linear Accelerator (DTL) is the first portion of a half mile long linear section of accelerator that raises the beam energy from 750 keV to 100 MeV. In its 31st year of operation (2003), the DTL experienced serious issues. The first problem was the inability to maintain resonant frequency at full power. The second problem was increased occurrences of over-temperature failure of cooling hoses. These shortcomings led to an investigation during the 2003 yearly preventative maintenance shutdown that showed evidence of excessive heating: discolored interior tank walls and coper oxide deposition in the cooling circuits. Since overheating was suspected to be caused by compromised heat transfer, improving that was the focus of the repair effort. Investigations revealed copper oxide flow inhibition and iron oxide scale build up. Acid cleaning was implemented with careful attention to protection of the base metal, selection of components to clean and minimization of exposure times. The effort has been very successful in bringing the accelerator through a complete eight month run cycle allowing an incredible array of scientific experiments to be completed this year (2003-2004). This paper will describe the systems, investigation analysis, repair, return to production and conclusion.

  3. Repair of mismatched basepairs in mammalian DNA

    Energy Technology Data Exchange (ETDEWEB)

    Taylor, J.H.; Hare, J.T.

    1991-08-01

    We have concentrated on three specific areas of our research plan. Our greatest emphasis is on the role of single strand nicks in influencing template strand selection in mismatch repair. We have found, that the ability of a nick in one strand to influence which strand is repaired is not a simple function of distance from the mismatched site but rather that an hot spot where a nick is more likely to have an influence can exist. The second line was production of single-genotype heteroduplexes in order to examine independently the repair of T/G and A/C mispairs within the same sequence context as in our mixed mispair preparations. We have shown preparations of supercoiled heteroduplex can be prepared that were exclusively T/G or exclusively A/C at the mispair site. The third effort has been to understand the difference in repair bias of different cell lines or different transfection conditions as it may relate to different repair systems in the cell. We have identified some of the sources of variation, including cell cycle position. We hope to continue this work to more precisely identify the phase of the cell cycle.

  4. Repair Optimal Erasure Codes through Hadamard Designs

    CERN Document Server

    Papailiopoulos, Dimitris S; Cadambe, Viveck R

    2011-01-01

    In distributed storage systems that employ erasure coding, the issue of minimizing the total {\\it communication} required to exactly rebuild a storage node after a failure arises. This repair bandwidth depends on the structure of the storage code and the repair strategies used to restore the lost data. Designing high-rate maximum-distance separable (MDS) codes that achieve the optimum repair communication has been a well-known open problem. In this work, we use Hadamard matrices to construct the first explicit 2-parity MDS storage code with optimal repair properties for all single node failures, including the parities. Our construction relies on a novel method of achieving perfect interference alignment over finite fields with a finite file size, or number of extensions. We generalize this construction to design $m$-parity MDS codes that achieve the optimum repair communication for single systematic node failures and show that there is an interesting connection between our $m$-parity codes and the systematic-...

  5. DNA repair variants and breast cancer risk.

    Science.gov (United States)

    Grundy, Anne; Richardson, Harriet; Schuetz, Johanna M; Burstyn, Igor; Spinelli, John J; Brooks-Wilson, Angela; Aronson, Kristan J

    2016-05-01

    A functional DNA repair system has been identified as important in the prevention of tumour development. Previous studies have hypothesized that common polymorphisms in DNA repair genes could play a role in breast cancer risk and also identified the potential for interactions between these polymorphisms and established breast cancer risk factors such as physical activity. Associations with breast cancer risk for 99 single nucleotide polymorphisms (SNPs) from genes in ten DNA repair pathways were examined in a case-control study including both Europeans (644 cases, 809 controls) and East Asians (299 cases, 160 controls). Odds ratios in both additive and dominant genetic models were calculated separately for participants of European and East Asian ancestry using multivariate logistic regression. The impact of multiple comparisons was assessed by correcting for the false discovery rate within each DNA repair pathway. Interactions between several breast cancer risk factors and DNA repair SNPs were also evaluated. One SNP (rs3213282) in the gene XRCC1 was associated with an increased risk of breast cancer in the dominant model of inheritance following adjustment for the false discovery rate (P breast cancer risk or their modification by breast cancer risk factors were observed.

  6. Oyster Shell Dredging in Gulf of Mexico Waters, St. Mary and Terrebonne Parishes, Louisiana. Final Environmental Impact Statement and Appendixes

    Science.gov (United States)

    1994-04-01

    terrestrial and shallow aquatic habitats in the project area such as shallow shoreline areas and wildlife refuges. ALTERNATIVE 2 No Action - No Dredging in...area. The likelihood of intact terrestrial sites is considered minimal since the process of inundation involved erosion of former land surfaces along...Prionotus rubio blackf in searobin x Prionotus scitulus leopard searobin x Prionotus tribulus bighead searobin x Pristis pectinata smalltooth sawfish x

  7. Characterizing Seagrass Exposure to Light Attenuation and Turbidity Associated with Dredging Activity in the Gulf Intracoastal Waterway, Sarasota Bay, Florida

    Science.gov (United States)

    2016-11-01

    Township 35 South, Range 16 East, Florida. During the development of this project, the entire GIWW and adjoining Longboat Pass were evaluated to...using pump samplers, acoustic Doppler current profilers, and turbidity probes. As part of ERDC TN-DOER-E39 November 2016 4 this overall experiment...material created by dredging activities reflect and absorb sunlight reducing the depth at which photosynthesis can occur, it was decided to collect both

  8. Histone displacement during nucleotide excision repair

    DEFF Research Database (Denmark)

    Dinant, C.; Bartek, J.; Bekker-Jensen, S.

    2012-01-01

    Nucleotide excision repair (NER) is an important DNA repair mechanism required for cellular resistance against UV light and toxic chemicals such as those found in tobacco smoke. In living cells, NER efficiently detects and removes DNA lesions within the large nuclear macromolecular complex called...... of histone variants and histone displacement (including nucleosome sliding). Here we review current knowledge, and speculate about current unknowns, regarding those chromatin remodeling activities that physically displace histones before, during and after NER. © 2012 by the authors; licensee MDPI, Basel...

  9. Repairing A Shaft Prone To Fatigue

    Science.gov (United States)

    Sharp, Roger A.; Larsen, David V.; Bates, Garold A.

    1991-01-01

    Shaft of hydraulic motor now outlives its bearings. Procedure for repairing John Deere Series 50 (or equivalent) hydraulic motor solves problem posed by common type of fatigue failure of shaft. Includes forming internally threaded hole in end of shaft, inserting double-threaded end stud, and adding washers and collars.

  10. Exosomes and cardiac repair after myocardial infarction.

    Science.gov (United States)

    Sahoo, Susmita; Losordo, Douglas W

    2014-01-17

    Myocardial infarction is a leading cause of death among all cardiovascular diseases. The analysis of molecular mechanisms by which the ischemic myocardium initiates repair and remodeling indicates that secreted soluble factors are key players in communication to local and distant tissues, such as bone marrow. Recently, actively secreted membrane vesicles, including exosomes, are being recognized as new candidates with important roles in intercellular and tissue-level communication. In this review, we critically examine the emerging role of exosomes in local and distant microcommunication mechanisms after myocardial infarction. A comprehensive understanding of the role of exosomes in cardiac repair after myocardial infarction could bridge a major gap in knowledge of the repair mechanism after myocardial injury.

  11. Groundwater Surface Water Interactions in a Gold-Mined Dredged Floodplain of the Merced River

    Science.gov (United States)

    Sullivan, L.; Conklin, M. H.; Ghezzehei, T. A.

    2012-12-01

    The Merced River, originating in the Sierra Nevada, California, drains a watershed with an area of ~3,305 km2. Merced River has been highly altered due to diversions, mechanically dredged mining, and damming. A year of groundwater-surface water interactions were studied to elucidate the hydrological connection between the Main Canal, an unlined canal that contains Merced River water flows parallel to the river with an average elevation of 89m, the highly conductive previously dredged floodplain, and the Merced River with an average elevation of 84m. Upstream of the study reach, located in an undredged portion, of the floodplain are two fish farms that have been operating for approximately 40 years. This study reach has been historically important for salmon spawning and rearing, where more than 50% of the Chinook salmon of the Merced River spawn. Currently salmon restoration is focusing gravel augmentation and adding side channel and ignoring groundwater influences. Exchanges between the hyporheic and surrounding surface, groundwater, riparian, and alluvial floodplain habitats occur over a wide range of spatial and temporal scales. Pressure transducers were installed in seven wells and four ponds located in the dredged floodplain. All wells were drilled to the Mehrten Formation, a confining layer, and screened for last 3m. These groundwater well water levels as well as the surface water elevations of the Main Canal and the Merced River were used to determine the direction of sublateral surface flows using Groundwater Vistas as a user interface for MODFLOW. The well and pond waters and seepage from the river banks were sampled for anion/cation, dissolved organic carbon, total nitrogen, total iron, and total dissolved iron concentrations to determine water sources and the possibility of suboxic water. Field analysis indicated that water in all wells and ponds exhibit low dissolved oxygen, high conductivity rates, and oxidation/reduction potentials that switched from

  12. Discordant Temporal Turnovers of Sediment Bacterial and Eukaryotic Communities in Response to Dredging: Nonresilience and Functional Changes.

    Science.gov (United States)

    Zhang, Na; Xiao, Xian; Pei, Meng; Liu, Xiang; Liang, Yuting

    2017-01-01

    To study the stability and succession of sediment microbial and macrobenthic communities in response to anthropogenic disturbance, a time-series sampling was conducted before, during, and 1 year after dredging in the Guan River in Changzhou, China, which was performed with cutter suction dredgers from 10 April to 20 May 2014. The microbial communities were analyzed by sequencing bacterial 16S rRNA and eukaryotic 18S rRNA gene amplicons with Illumina MiSeq, and the macrobenthic community was identified using a morphological approach simultaneously. The results indicated that dredging disturbance significantly altered the composition and structures of sediment communities. The succession rates of communities were estimated by comparing the slopes of time-decay relationships. The temporal turnover of microeukaryotes (w = 0.3251, P species turnover) across log(time)]) was the highest, followed by that of bacteria (w = 0.2450, P turnovers and nonresilience of sediment communities under dredging resulted in functional changes, which are important for predicting sediment ecosystem functions under anthropogenic disturbances.

  13. A field study on phytoremediation of dredged sediment contaminated by heavy metals and nutrients: the impacts of sediment aeration.

    Science.gov (United States)

    Wu, Juan; Yang, Lihua; Zhong, Fei; Cheng, Shuiping

    2014-12-01

    Compared to traditional chemical or physical treatments, phytoremediation has proved to be a cost-effective and environmentally sound alternative for remediation of contaminated dredged sediment. A field study was conducted in a sediment disposal site predominantly colonized by Typha angustifolia under different sediment moisture conditions to estimate the phytoremediation effects of dredged sediment. The moisture content was 37.30 % and 48.27 % in aerated and waterlogged sediment, respectively. Total nitrogen (TN) content was higher in the waterlogged sediment than in the aerated sediment. The total Cd contents were lower in aerated sediment, which was mainly resulted from the lower exchangeable fraction of Cd. The bioaccumulation of P, Cu and Pb in T. angustifolia was promoted by waterlogging, and the belowground tissue concentrations and accumulation factors (AFs) of Cu were higher than that of other metals, which can be explained by that Cu is an essential micronutrient for plants. Consistent with many previous studies, T. angustifolia showed higher metal levels in roots than in above-ground tissues at both the sediment conditions. Due to the improved biomass produced in the aerated sediment, the removals of nutrients and the metals by plant harvest were higher from aerated sediment than from waterlogged sediment. It was indicated that maintaining the dredged sediment aerated can avoid release risk and plant uptake of metals, while the opposite management option can promote phytoextraction of these contaminants.

  14. Process methods and levels of automation of wood pallet repair in the United States

    Science.gov (United States)

    Jonghun Park; Laszlo Horvath; Robert J. Bush

    2016-01-01

    This study documented the current status of wood pallet repair in the United States by identifying the types of processing and equipment usage in repair operations from an automation prespective. The wood pallet repair firms included in the sudy received an average of approximately 1.28 million cores (i.e., used pallets) for recovery in 2012. A majority of the cores...

  15. DNA repair and gene targeting in plant end-joining mutants

    NARCIS (Netherlands)

    Jia, Qi

    2011-01-01

    DNA double-strand breaks (DSBs) can be repaired by homologous recombination (HR) or by non-homologous end joining (NHEJ). The latter mechanism is the major route for DSB repair in the somatic cells of higher eukaryotes, including plants. If we could manipulate the balance of the DSB repair pathways

  16. DNA repair and gene targeting in plant end-joining mutants

    NARCIS (Netherlands)

    Jia, Qi

    2011-01-01

    DNA double-strand breaks (DSBs) can be repaired by homologous recombination (HR) or by non-homologous end joining (NHEJ). The latter mechanism is the major route for DSB repair in the somatic cells of higher eukaryotes, including plants. If we could manipulate the balance of the DSB repair pathways

  17. Wellbore Seal Repair Using Nanocomposite Materials

    Energy Technology Data Exchange (ETDEWEB)

    Stormont, John [Univ. of New Mexico, Albuquerque, NM (United States)

    2016-08-31

    ), including the use of either cement or a nanocomposite in the microannulus to represent a repaired system. This wellbore model was successfully coupled with a field-scale model of CO2 injection, to enable predictions of stress and strains in the wellbore subjected to subsurface changes (i.e. domal uplift) associated with fluid injection.

  18. Laparoscopic repair for vesicouterine fistulae

    Directory of Open Access Journals (Sweden)

    Rafael A. Maioli

    2015-10-01

    Full Text Available ABSTRACT Objective: The purpose of this video is to present the laparoscopic repair of a VUF in a 42-year-old woman, with gross hematuria, in the immediate postoperative phase following a cesarean delivery. The obstetric team implemented conservative management, including Foley catheter insertion, for 2 weeks. She subsequently developed intermittent hematuria and cystitis. The urology team was consulted 15 days after cesarean delivery. Cystoscopy indicated an ulcerated lesion in the bladder dome of approximately 1.0cm in size. Hysterosalpingography and a pelvic computed tomography scan indicated a fistula. Materials and Methods: Laparoscopic repair was performed 30 days after the cesarean delivery. The patient was placed in the lithotomy position while also in an extreme Trendelenburg position. Pneumoperitoneum was established using a Veress needle in the midline infra-umbilical region, and a primary 11-mm port was inserted. Another 11-mm port was inserted exactly between the left superior iliac spine and the umbilicus. Two other 5-mm ports were established under laparoscopic guidance in the iliac fossa on both sides. The omental adhesions in the pelvis were carefully released and the peritoneum between the bladder and uterus was incised via cautery. Limited cystotomy was performed, and the specific sites of the fistula and the ureteral meatus were identified; thereafter, the posterior bladder wall was adequately mobilized away from the uterus. The uterine rent was then closed using single 3/0Vicryl sutures and two-layer watertight closure of the urinary bladder was achieved by using 3/0Vicryl sutures. An omental flap was mobilized and inserted between the uterus and the urinary bladder, and was fixed using two 3/0Vicryl sutures, followed by tube drain insertion. Results: The operative time was 140 min, whereas the blood loss was 100ml. The patient was discharged 3 days after surgery, and the catheter was removed 12 days after surgery

  19. Assessment of Human DNA Repair (NER) Capacity With DNA Repair Rate (DRR) by Comet Assay

    Institute of Scientific and Technical Information of China (English)

    WEI ZHENG; JI-LIANG HE; LI-FEN JIN; JIAN-LIN LOU; BAO-HONG WANG

    2005-01-01

    Objective Alkaline comet assay was used to evaluate DNA repair (nucleotide excision repair, NER) capacity of human fresh lymphocytes from 12 young healthy non-smokers (6 males and 6 females). Methods Lymphocytes were exposed to UV-C (254 nm) at the dose rate of 1.5 J/m2/sec. Novobiocin (NOV) and aphidicolin (APC), DNA repair inhibitors, were utilized to imitate the deficiency of DNA repair capacity at the incision and ligation steps of NER. Lymphocytes from each donor were divided into three grougs: UVC group, UVC plus NOV group, and UVC plus APC group. DNA single strand breaks were detected in UVC irradiated cells incubated for 0, 30, 60, 90, 120, 180, and 240 min after UVC irradiation. DNA repair rate (DRR) served as an indicator of DNA repair capacity. Results The results indicated that the maximum DNA damage (i.e. maximum tail length) in the UVC group mainly appeared at 90 min. The ranges of DRRs in the UVC group were 62.84%-98.71%. Average DRR value was 81.84%. The DRR difference between males and females was not significant (P<0.05). However, the average DRR value in the UVC plus NOV group and the UVC plus APC group was 52.98% and 39.57% respectively, which were significantly lower than that in the UVC group (P<0.01). Conclusion The comet assay is a rapid, simple and sensitive screening test to assess individual DNA repair (NER) capacity. It is suggested that the time to detect DNA single strand breaks in comet assay should include 0 (before UV irradiation), 90 and 240 min after exposure to 1.5 J·m-2 UVC at least. The DRR, as an indicator, can represent the individual DNA repair capacity in comet assay.

  20. Factors affecting healing after arthroscopic rotator cuff repair

    Science.gov (United States)

    Abtahi, Amir M; Granger, Erin K; Tashjian, Robert Z

    2015-01-01

    Rotator cuff repair has been shown to have good long-term results. Unfortunately, a significant proportion of repairs still fail to heal. Many factors, both patient and surgeon related, can influence healing after repair. Older age, larger tear size, worse muscle quality, greater muscle-tendon unit retraction, smoking, osteoporosis, diabetes and hypercholesterolemia have all shown to negatively influence tendon healing. Surgeon related factors that can influence healing include repair construct-single vs double row, rehabilitation, and biologics including platelet rich plasma and mesenchymal stem cells. Double-row repairs are biomechanically stronger and have better healing rates compared with single-row repairs although clinical outcomes are equivalent between both constructs. Slower, less aggressive rehabilitation programs have demonstrated improved healing with no negative effect on final range of motion and are therefore recommended after repair of most full thickness tears. Additionally no definitive evidence supports the use of platelet rich plasma or mesenchymal stem cells regarding improvement of healing rates and clinical outcomes. Further research is needed to identify effective biologically directed augmentations that will improve healing rates and clinical outcomes after rotator cuff repair. PMID:25793161

  1. Nanomaterials promise better bone repair

    Directory of Open Access Journals (Sweden)

    Qifei Wang

    2016-10-01

    Full Text Available Nanomaterials mimicking the nano-features of bones and offering unique smart functions are promising for better bone fracture repair. This review provides an overview of the current state-of-the-art research in developing and using nanomaterials for better bone fracture repair. This review begins with a brief introduction of bone fracture repair processes, then discusses the importance of vascularization, the role of growth factors in bone fracture repair, and the failure of bone fracture repair. Next, the review discusses the applications of nanomaterials for bone fracture repair, with a focus on the recent breakthroughs such as nanomaterials leading to precise immobilization of growth factors at the molecular level, promoting vascularization without the use of growth factors, and re-loading therapeutic agents after implantation. The review concludes with perspectives on challenges and future directions for developing nanomaterials for improved bone fracture repair.

  2. Hydrogeologic framework, hydrology, and water quality in the Pearce Creek Dredge Material Containment Area and vicinity, Cecil County, Maryland, 2010-11

    Science.gov (United States)

    Dieter, Cheryl A.; Koterba, Michael T.; Zapecza, Otto S.; Walker, Charles W.; Rice, Donald E.

    2013-01-01

    In 2009, to support an evaluation of the feasibility of reopening the Pearce Creek Dredge Material Containment Area (DMCA) in Cecil County, Maryland, for dredge-spoil disposal, the U.S. Geological Survey (USGS) began to implement a comprehensive study designed to improve the understanding of the hydrogeologic framework, hydrology, and water quality of shallow aquifers underlying the DMCA and adjacent communities, to determine whether or not the DMCA affected groundwater quality, and to assess whether or not groundwater samples contained chemical constituents at levels greater than maximum allowable or recommended levels established by the U.S. Environmental Protection Agency Safe Drinking Water Act. The study, conducted in 2010-11 by USGS in cooperation with the U.S. Army Corps of Engineers, included installation of observation wells in areas where data gaps led earlier studies to be inconclusive. The data from new wells and existing monitoring locations were interpreted and show the DMCA influences the groundwater flow and quality. Groundwater flow in the two primary aquifers used for local supplies-the Magothy aquifer and upper Patapsco aquifer (shallow water-bearing zone)-is radially outward from the DMCA toward discharge areas, including West View Shores, the Elk River, and Pearce Creek Lake. In addition to horizontal flow outward from the DMCA, vertical gradients primarily are downward in most of the study area, and upward near the Elk River on the north side of the DMCA property, and the western part of West View Shores. Integrating groundwater geochemistry data in the analysis, the influence of the DMCA is not only a source of elevated concentrations of dissolved solids but also a geochemical driver of redox processes that enhances the mobilization and transport of redox-sensitive metals and nutrients. Groundwater affected by the DMCA is in the Magothy aquifer and upper Patapsco aquifer (shallow water-bearing zone). Based on minimal data, the water quality

  3. Impact on a fish assemblage of the maintenance dredging of a navigation channel in a tropical coastal ecosystem

    Directory of Open Access Journals (Sweden)

    Demarques Ribeiro da Silva Junior

    2012-03-01

    Full Text Available Dredging and dredge-spoil disposal are among the major problems in coastal management. Many of the scientific contributions concerning the impacts of this practice are based on the study of sessile organisms and subtropical environments. We evaluated changes in the composition and abundance of a fish assemblage resulting from dredging and sediment disposal at the mouth and in the adjacent waters of the Caravelas River on the north-eastern coast of Brazil. Samples were collected in two directly impacted and three adjacent areas. Differences among stations were not significant, but the dredged site had the least diverse station, as expected. The stations farthest from the directly impacted areas apparently were not influenced by the coastal work, thus suggesting localised effects. The contribution of the present study is particularly important because of the study area's proximity to others that have high conservation value such as mangrove forests and coral reefs, and the relevance of the subject given the continuing dredging activity.A dragagem e descarte de sedimento se destacam como atividades que geram grandes distúrbios aos ecossistemas marinhos e, consequentemente tornam-se um desafio ao manejo e ordenamento costeiro. Grande parte dos estudos que abordam seus impactos é baseada em pesquisas com organismos sésseis e em ambientes temperados, criando uma lacuna no entendimento de seus efeitos sobre a ictiofauna, principalmente nas regiões tropicais. No presente estudo foram avaliadas as alterações na composição e abundância da comunidade de peixes sob influência da dragagem e descarte de sedimento na foz do Rio Caravelas, costa da região Nordeste do Brasil. As amostras foram obtidas em duas estações diretamente afetadas e em três outras áreas adjacentes. Não houve diferença significativa na diversidade média obtida para cada estação, porém a estação correspondente à área dragada apresentou o menor valor dentre as

  4. Laparoscopic Incisional Hernia Repair in Obese Patients

    Science.gov (United States)

    2005-01-01

    Background and Objectives: Laparoscopic incisional hernia repair is coming to the forefront as a preferred method of repair due to the advantages offered by minimally invasive techniques. To evaluate safety and feasibility of this approach in obese patients when performed by a general surgeon trained in basic laparoscopy with no prior experience in this technique, we reviewed our early experience in the first 18 patients. Methods: All patients with incisional hernias presenting to a single surgeon from 2000 to 2002 were offered laparoscopic repair. Patients were informed about the limited experience of the surgeon in this particular field. Those who consented were repaired laparoscopically using a standard 4-port technique, one 12-mm port and three 5-mm ports. All patients with body mass index ≥30 were included in this review. A retrospective review of the data included demographics, operative time, blood loss, hospital stay, postoperative complications, and patient satisfaction. Results: Nineteen laparoscopic repairs were completed in 18 patients. No conversions to open repair were necessary. All patients were females except for 2. All hernia sacs were left in place, some of which were empty while others required extensive lysis of adhesions to release sac contents. Mean fascial defect was 102.5 cm2. One defect was closed primarily without mesh, while the rest were closed using Composix mesh in 1 and Dual Plus Gore-Tex mesh in the rest. Three patients were discharged from the recovery room. Mean follow-up was 24 months. No wound or mesh infections occurred. Eight patients had no complications. Eight patients had asymptomatic seromas. Two patients had hematomas; none of them required drainage. One patient had nonspecific dizziness. One patient presented with bowel obstruction secondary to early recurrence (within a week). The repair was salvaged laparoscopically. Upon evaluation by telephone calls, all patients indicated extreme satisfaction with the results

  5. Ecological evaluation of proposed dredged material from Bulls Head Channel (lower Suisun Bay)

    Energy Technology Data Exchange (ETDEWEB)

    Kohn, N.P.; White, P.J.; Gardiner, W.W.; Word, J.Q. [Battelle/Marine Sciences Lab., Sequim, WA (United States)

    1994-07-01

    This report describes the sampling and testing program conducted for USACE by Battelle/Marine Sciences Laboratory (MSL) to address (1) exclusion from further testing for ocean disposal, (2) suitability of open-water disposal within San Francisco Bay, and (3) beneficial uses, based on open-water and upland (leaching) disposal criteria, for the estimated 1.86 million cubic yards of sediment to be dredged from Bulls Head Channel and turning basin. To meet these objectives, core samples were collected from 28 locations to a depth of -47 ft mean lower low water (MLLW), which is -45 ft MLLW plus 2 ft overdepth. One to three samples per coring location were characterized physically and chemically; sediment from groups of locations and from various depth strata were combined into composite samples for biological toxicity characterization in addition to physical and chemical characterization. The chemical and biological tests were conducted following the guidance of USACE, the US Environmental Protection Agency (EPA), and state regulatory agencies.

  6. Evolutionary calculations of carbon dredge-up in helium envelope white dwarfs

    CERN Document Server

    MacDonald, J; José, J; Donald, James Mac; Hernanz, Margarita; José, Jordi; Physics, Department of; Delaware, University of; Catalunya, Institut d'Estudis Espacials de; Unit, CSIC Research; Nexus-201, Edifici; Nuclear, Departament de Fí sica i Enginyeria; Balaguer, Avda. Ví ctor

    1998-01-01

    We investigate the evolution of cooling helium atmosphere white dwarfs using a full evolutionary code, specifically developed for following the effects of element diffusion and gravitational settling on white dwarf cooling. The major difference between this work and previous work is that we use more recent opacity data from the OPAL project. Since, in general, these opacities are higher than those available ten years ago, at a given effective temperature, convection zones go deeper than in models with older opacity data. Thus convective dredge-up of observationally detectable carbon in helium atmosphere white dwarfs can occur for thicker helium layers than found by Pelletier et al (1986). We find that the range of observed C to He ratios in different DQ white dwarfs of similar effective temperature is well explained by a range of initial helium layer mass between $10^{-3}$ and $10^{-2} M_{\\odot}$, in good agreement with stellar evolution theory, assuming a typical white dwarf mass of $0.6 M_{\\odot}$. We also ...

  7. Lightweight Aggregate Made from Dredged Material in Green Roof Construction for Stormwater Management

    Directory of Open Access Journals (Sweden)

    Rui Liu

    2016-07-01

    Full Text Available More than 1.15 million cubic meters (1.5 million cubic yards of sediment require annual removal from harbors and ports along Ohio’s Lake Erie coast. Disposing of these materials into landfills depletes land resources, while open water placement of these materials deteriorates water quality. There are more than 14,000 acres of revitalizing brownfields in Cleveland, U.S., many containing up to 90% impervious surface, which does not allow “infiltration” based stormwater practices required by contemporary site-based stormwater regulation. This study investigates the potential of sintering the dredged material from the Harbor of Cleveland in Lake Erie to produce lightweight aggregate (LWA, and apply the LWA to green roof construction. Chemical and thermal analyses revealed the sintered material can serve for LWA production when preheated at 550 °C and sintered at a higher temperature. Through dewatering, drying, sieving, pellet making, preheating, and sintering with varying temperatures (900–1100 °C, LWAs with porous microstructures are produced with specific gravities ranging from 1.46 to 1.74, and water absorption capacities ranging from 11% to 23%. The water absorption capacity of the aggregate decreases as sintering temperature increases. The LWA was incorporated into the growing media of a green roof plot, which has higher water retention capacity than the conventional green roof system.

  8. A method of determining nonlinear large strain consolidation parameters of dredged clays

    Directory of Open Access Journals (Sweden)

    Yu-peng CAO

    2014-04-01

    Full Text Available A method of obtaining the large strain consolidation parameters of dredged clays considering the influence of the initial water content is investigated in this study. According to the test results of remolded clays with high initial water contents reported by Hong et al. (2010, a relationship between the void ratio (e and effective stress (σ' is established. Furthermore, based on the available permeability data from the literature, a new relationship between the permeability coefficient (k and the ratio (e/eL of the void ratio to the void ratio at the liquid limit (eL is proposed. The new proposed expression considering the initial water content improves the e-k equation established by Nagaraj et al. (1994. Finally, the influence of the initial void ratio and effective stress on the large strain consolidation coefficient g(e defined by Gibson et al. (1981 and k/(1+e in large strain analysis is discussed. The results show that, under a constant effective stress, the value of k/(1+e increases with the initial void ratio. The large strain consolidation coefficient shows the law of segmentation change, which decreases with the increase of the effective stress when the effective stress is less than the remolded yield stress, but increases rapidly with the effective stress when the effective stress is larger than the remolded yield stress.

  9. Rip currents and alongshore flows in single channels dredged in the surf zone

    Science.gov (United States)

    Moulton, Melissa; Elgar, Steve; Raubenheimer, Britt; Warner, John C.; Kumar, Nirnimesh

    2017-05-01

    To investigate the dynamics of flows near nonuniform bathymetry, single channels (on average 30 m wide and 1.5 m deep) were dredged across the surf zone at five different times, and the subsequent evolution of currents and morphology was observed for a range of wave and tidal conditions. In addition, circulation was simulated with the numerical modeling system COAWST, initialized with the observed incident waves and channel bathymetry, and with an extended set of wave conditions and channel geometries. The simulated flows are consistent with alongshore flows and rip-current circulation patterns observed in the surf zone. Near the offshore-directed flows that develop in the channel, the dominant terms in modeled momentum balances are wave-breaking accelerations, pressure gradients, advection, and the vortex force. The balances vary spatially, and are sensitive to wave conditions and the channel geometry. The observed and modeled maximum offshore-directed flow speeds are correlated with a parameter based on the alongshore gradient in breaking-wave-driven-setup across the nonuniform bathymetry (a function of wave height and angle, water depths in the channel and on the sandbar, and a breaking threshold) and the breaking-wave-driven alongshore flow speed. The offshore-directed flow speed increases with dissipation on the bar and reaches a maximum (when the surf zone is saturated) set by the vertical scale of the bathymetric variability.

  10. Rip currents and alongshore flows in single channels dredged in the surf zone

    Science.gov (United States)

    Moulton, Melissa; Elgar, Steve; Raubenheimer, Britt; Warner, John C.; Kumar, Nirnimesh

    2017-01-01

    To investigate the dynamics of flows near nonuniform bathymetry, single channels (on average 30 m wide and 1.5 m deep) were dredged across the surf zone at five different times, and the subsequent evolution of currents and morphology was observed for a range of wave and tidal conditions. In addition, circulation was simulated with the numerical modeling system COAWST, initialized with the observed incident waves and channel bathymetry, and with an extended set of wave conditions and channel geometries. The simulated flows are consistent with alongshore flows and rip-current circulation patterns observed in the surf zone. Near the offshore-directed flows that develop in the channel, the dominant terms in modeled momentum balances are wave-breaking accelerations, pressure gradients, advection, and the vortex force. The balances vary spatially, and are sensitive to wave conditions and the channel geometry. The observed and modeled maximum offshore-directed flow speeds are correlated with a parameter based on the alongshore gradient in breaking-wave-driven-setup across the nonuniform bathymetry (a function of wave height and angle, water depths in the channel and on the sandbar, and a breaking threshold) and the breaking-wave-driven alongshore flow speed. The offshore-directed flow speed increases with dissipation on the bar and reaches a maximum (when the surf zone is saturated) set by the vertical scale of the bathymetric variability.

  11. Post first dredge-up [C/N] ratio as age indicator. Theoretical calibration

    CERN Document Server

    Salaris, Maurizio; Piersimoni, Anna M; Cassisi, Santi

    2015-01-01

    We performed a detailed analysis of the use of [C/N] measured in red giant branch stars between the completion of the first dredge up and the red giant branch bump ([C/N]_{FDU}) as age indicator. [C/N]_{FDU} cannot give accurate ages for individual stars, but may provide a general chronology for the formation of composite populations and add constraints to analyses of red giants from surface gravity-effective temperature diagrams. We provide a theoretical calibration of [C/N]_{FDU} in terms of total metallicity [M/H] and age, for ages greater than 1 Gyr, which we tested against variations in the initial heavy element distribution (scaled-solar vs alpha-enhanced), efficiency of overshooting from MS convective cores and from the convective envelopes, variations in the initial He abundance and in the mixing length parameter. Our calibration is compared with a small sample of available measurements of [C/N]_{FDU} in star clusters and halo field stars, which at least qualitatively confirm the overall trend of the ...

  12. Enhanced-electrokinetic extraction of heavy metals from dredged harbor sediment.

    Science.gov (United States)

    Yoo, Jong-Chan; Yang, Jung-Seok; Jeon, Eun-Ki; Baek, Kitae

    2015-07-01

    In this study, the feasibility of an ex situ electrokinetic (EK) process combined with pre-oxidation using hydrogen peroxide (H2O2) and pre-washing using ethylenediaminetetraacetic acid (EDTA) was investigated in enhancing the extraction of Cu, Pb, and Zn from actual dredged harbor sediment. H2O2 pre-oxidation led to a change in the fractionation of Cu bound to organic matter and the sulfide fraction in the Fe-Mn oxides to the exchangeable fraction, but was not effective at removing metals. In contrast, EDTA pre-washing changed the Fe-Mn oxide-bound fractions of Cu and Pb into easily extractable fractions; 20.1, 27.5, and 32.8% of Cu, Pb, and Zn were removed, respectively. During EK treatment, metals were transported toward the anode by electromigration of negatively charged complexes such as metal-EDTA and metal-citrate. However, EK treatment did not significantly enhance the removal of metals because metals accumulated near the anodic region with an increase in the exchangeable fraction due to the short EK operating duration and low voltage gradient. Therefore, it is necessary to extend the EK operating duration and/or increase the voltage gradient for effective transportation and removal of metals from sediment.

  13. Estimated Entrainment of Dungeness Crab During Dredging For The Columbia River Channel Improvement Project

    Energy Technology Data Exchange (ETDEWEB)

    Pearson, Walter H.; Williams, Greg D.; Skalski, John R.

    2002-12-01

    The studies reported here focus on issues regarding the entrainment of Dungeness crab related to the proposed Columbia River Channel Improvement Project and provided direct measurements of crab entrainment rates at three locations (Desdomona Shoals, Upper Sands, and Miller Sands) from RM4 to RM24 during summer 2002. Entrainment rates for all age classes of crabs ranged from zero at Miller Sands to 0.224 crabs per cy at Desdemona Shoals in June 2002. The overall entrainment rate at Desdomona Shoals in September was 0.120 crabs per cy. A modified Dredge Impact Model (DIM) used the summer 2002 entrainment rates to project crab entrainment and adult equivalent loss and loss to the fishery for the Channel Improvement Project. To improve the projections, entrainment data from Flavel Bar is needed. The literature, analyses of salinity intrusion scenarios, and the summer 2002 site-specific data on entrainment and salinity all indicate that bottom salinity influences crab distribution and entrainment, especially at lower salinities. It is now clear from field measurements of entrainment rates and salinity during a period of low river flow (90-150 Kcfs) and high salinity intrusion that entrainment rates are zero where bottom salinity is less than 16 o/oo most of the time. Further, entrainment rates of 2+ and older crab fall with decreasing salinity in a clear and consistent manner. More elaboration of the crab distribution- salinity model, especially concerning salinity and the movements of 1+ crab, is needed.

  14. Application of Dredged Materials and Steelmaking Slag as Basal Media to Restore and Create Seagrass Beds: Mesocosm and Core Incubation Experiments

    Science.gov (United States)

    Tsukasaki, A.; Suzumura, M.; Tsurushima, N.; Nakazato, T.; Huang, Y.; Tanimoto, T.; Yamada, N.; Nishijima, W.

    2016-02-01

    Seagrass beds stabilize bottom sediments, improve water quality and light conditions, enhance species diversity, and provide habitat complexity in coastal marine environments. Seagrass beds are now experiencing worldwide decline by rapid environmental changes. Possible options of seagrass bed restoration are civil engineering works including mounding to raise the bottom to elevations with suitable light for seagrass growth. Reuse or recycling of dredged materials (DM) and various industrial by-products including steelmaking slags is a beneficial option to restore and create seagrass beds. To evaluate the applicability of DM and dephosphorization slag (Slag) as basal media of seagrass beds, we carried out mesocosm experiments and core incubation experiments in a land-based flow-through seawater tank over a year. During the mesocosm experiment, no difference was found in growth of eelgrass (Zostera marina L.) and macrobenthic community structures between Slag-based sediments and sand-based control experiments, even though Slag-based sediments exhibited substantially higher pH than sand-based sediments. During the core incubation experiment, we investigated detailed variation and distributions of pH and nutrients, and diffusion fluxes of nutrients between the sediment/seawater interface. Though addition of Slag induced high pH up to 10.7 in deep layers (reported in natural coastal systems. It was suggested that the mixture of Slag and DM is applicable as basal media for construction of artificial seagrass beds.

  15. Quality Requirements Regarding Aircraft Maintenance and Repair Services

    Directory of Open Access Journals (Sweden)

    Woźny Piotr

    2014-12-01

    Full Text Available During operation, aircraft (AC are subject to use, maintenance, repair and disposal. Each of those processes requires adequate quality. This study presents requirements related to quality management with which an AC maintenance and repair sub-system ought to comply. Documents containing requirements pertaining to both management and technical aspects have been analysed. Applicable standards and regulations affecting the AC repair process quality assurance have been presented. A description of standards observance of which is required to ensure effective operation of modern AC maintenance and repair subsystems significantly affecting maintenance of the AC required airworthiness has been included. Complexity of the decision-taking process pertaining to AC maintenance and repair within the airworthiness maintenance sub-system has been presented

  16. Wound repair and regeneration: Mechanisms, signaling, and translation

    Science.gov (United States)

    Eming, Sabine A.; Martin, Paul; Tomic-Canic, Marjana

    2015-01-01

    The cellular and molecular mechanisms underpinning tissue repair and its failure to heal are still poorly understood, and current therapies are limited. Poor wound healing after trauma, surgery, acute illness, or chronic disease conditions affects millions of people worldwide each year and is the consequence of poorly regulated elements of the healthy tissue repair response, including inflammation, angiogenesis, matrix deposition, and cell recruitment. Failure of one or several of these cellular processes is generally linked to an underlying clinical condition, such as vascular disease, diabetes, or aging, which are all frequently associated with healing pathologies. The search for clinical strategies that might improve the body’s natural repair mechanisms will need to be based on a thorough understanding of the basic biology of repair and regeneration. In this review, we highlight emerging concepts in tissue regeneration and repair, and provide some perspectives on how to translate current knowledge into viable clinical approaches for treating patients with wound-healing pathologies. PMID:25473038

  17. Comparison of shrinkage related properties of various patch repair materials

    Science.gov (United States)

    Kristiawan, S. A.; Fitrianto, R. S.

    2017-02-01

    A patch repair material has been developed in the form of unsaturated polyester resin (UPR)-mortar. The performance and durability of this material are governed by its compatibility with the concrete being repaired. One of the compatibility issue that should be tackled is the dimensional compatibility as a result of differential shrinkage between the repair material and the concrete substrate. This research aims to evaluate such shrinkage related properties of UPR-mortar and to compare with those of other patch repair materials. The investigation includes the following aspects: free shrinkage, resistance to delamination and cracking. The results indicate that UPR-mortar poses a lower free shrinkage, lower risk of both delamination and cracking tendency in comparison to other repair materials.

  18. Laboratory and Field Investigations of Small Crater Repair Technologies

    Science.gov (United States)

    2007-09-01

    Sustainment repairs currently employed include stone and grout, concrete cap, rapid set cementitious cap, AM2 mat, and asphalt repair methods. Lessons...upon the chemical reaction of component A (polymeric isocyanate ) with component B (a polyol blend containing certain additives). Each component is...polymeric isocyanate ) with component B (a polyol blend containing certain additives). Products selected include FOAM-iT! in 5, 10 and 15 lb/ft3

  19. Component Repair Times Obtained from MSPI Data

    Energy Technology Data Exchange (ETDEWEB)

    Eide, Steven A. [Curtiss-Wright/Scietech, Ketchum, ID (United States); Cadwallader, Lee [Idaho National Lab. (INL), Idaho Falls, ID (United States)

    2015-05-01

    Information concerning times to repair or restore equipment to service given a failure is valuable to probabilistic risk assessments (PRAs). Examples of such uses in modern PRAs include estimation of the probability of failing to restore a failed component within a specified time period (typically tied to recovering a mitigating system before core damage occurs at nuclear power plants) and the determination of mission times for support system initiating event (SSIE) fault tree models. Information on equipment repair or restoration times applicable to PRA modeling is limited and dated for U.S. commercial nuclear power plants. However, the Mitigating Systems Performance Index (MSPI) program covering all U.S. commercial nuclear power plants provides up-to-date information on restoration times for a limited set of component types. This paper describes the MSPI program data available and analyzes the data to obtain median and mean component restoration times as well as non-restoration cumulative probability curves. The MSPI program provides guidance for monitoring both planned and unplanned outages of trains of selected mitigating systems deemed important to safety. For systems included within the MSPI program, plants monitor both train UA and component unreliability (UR) against baseline values. If the combined system UA and UR increases sufficiently above established baseline results (converted to an estimated change in core damage frequency or CDF), a “white” (or worse) indicator is generated for that system. That in turn results in increased oversight by the US Nuclear Regulatory Commission (NRC) and can impact a plant’s insurance rating. Therefore, there is pressure to return MSPI program components to service as soon as possible after a failure occurs. Three sets of unplanned outages might be used to determine the component repair durations desired in this article: all unplanned outages for the train type that includes the component of interest, only

  20. Laparoscopic repair of vesicovaginal fistula

    Directory of Open Access Journals (Sweden)

    Miłosz Wilczyński

    2011-06-01

    Full Text Available A vesicovaginal fistula is one of the complications that a gynaecologist is bound to face after oncological operations, especially in postmenopausal women. Over the years there have been introduced many techniques of surgical treatment of this entity, including transabdominal and transvaginal approaches.We present a case of a 46-year-old patient who suffered from urinary leakage via the vagina due to the presence of a vesicovaginal fistula that developed after radical abdominal hysterectomy and subsequent radiotherapy. The decision was made to repair it laparoscopically due to retracted, fibrous and scarred tissue in the vaginal apex that precluded a transvaginal approach. A small cystotomy followed by an excision of fistula borders was performed. After six-month follow-up no recurrence of the disease has been noted.We conclude that laparoscopy is an interesting alternative to traditional approaches that provides comparable results.

  1. Laparoscopic Repair of Morgagni Hernia

    Directory of Open Access Journals (Sweden)

    ilker murat arer

    2015-03-01

    Full Text Available Morgagni hernia is a congenital herniation of abdominal contents into the thoracic cavity through a retrosternal diaphragmatic defect and make up about 1 % - 5 % of all types of congenital diaphragmatic hernias. Surgical repair of Morgagni hernias is usually indicated when patients are symptomatic and have a high risk of strangulation or incarceration of the contained viscera. 71-year-old male patient admitted to emergency department with a 2-day history of abdominal pain, vomiting and obstipation. Laparoscopic repair for Morgagni hernia was performed. Laparoscopic repair for Morgagni hernia with mesh repair is secure, satisfactory and easily performed. [Cukurova Med J 2015; 40(Suppl 1: 71-74

  2. Combinatorial Reliability and Repair

    Science.gov (United States)

    1992-07-01

    Press, Oxford, 1987. [2] G. Gordon and L. Traldi, Generalized activities and the Tutte polynomial , Discrete Math. 85 (1990), 167-176. [3] A. B. Huseby, A...particular, Satyanarayana and Tindell introduced a notion of (K,j)-domination in their study of a K-terminal version of the chromatic polynomial [6], and it...G)) graphs. He also intends to look into the properties of the polynomial that gives the expected number of needed repairs of a K-terminal network

  3. Mammalian mismatch repair

    DEFF Research Database (Denmark)

    Pena Diaz, Javier; Jiricny, Josef

    2012-01-01

    A considerable surge of interest in the mismatch repair (MMR) system has been brought about by the discovery of a link between Lynch syndrome, an inherited predisposition to cancer of the colon and other organs, and malfunction of this key DNA metabolic pathway. This review focuses on recent...... advances in our understanding of the molecular mechanisms of canonical MMR, which improves replication fidelity by removing misincorporated nucleotides from the nascent DNA strand. We also discuss the involvement of MMR proteins in two other processes: trinucleotide repeat expansion and antibody maturation...

  4. DNA repair, immunosuppression, and skin cancer.

    Science.gov (United States)

    Yarosh, Daniel B

    2004-11-01

    UV radiation (UVR) produces erythema within the first 24 hours of exposure, suppression of the immune system within the first 10 days, and, for many people, over the course of decades, skin cancer. Although UVR damages many skin targets, DNA damage in the form of cyclobutane pyrimidine dimers (CPDs) is an important mediator of these sequelae. The action spectrum for erythema parallels the action spectrum for CPD formation in skin, and in the absence of repair, as in the genetic disease xeroderma pigmentosum (XP), skin cancer rates are dramatically increased. DNA repair in skin can be enhanced by the delivery of DNA repair enzymes encapsulated in liposomes. Used in this way, photoreactivation of CPDs greatly diminishes erythema and the suppression of contact hypersensitivity (CHS). UV endonucleases delivered by liposomes also prevent UV-induced suppression of delayed-type hypersensitivity. In a clinical study of patients with XP, T4 endonuclease V (T4N5) liposome lotion applied for one year reduced the rates of actinic keratosis (AK) and skin cancer compared with placebo. These results showed that strategies to increase sun protection should include measures to reduce DNA damage and increase the rate of DNA repair.

  5. MODELLING OF SEDIMENTS CONCENTRATION DISTRIBUTION IN DREDGED CANALS OF THE NIGER DELTA ESTUARINE REGION, NIGERIA

    Directory of Open Access Journals (Sweden)

    Charles Chizom Dike

    2013-01-01

    Full Text Available Previous sediments concentration distributi on models used in the study of sediment characteristics of the dredged canals in the Niger-Delta estuarine region, Nigeria; did not take into consideration the lateral in flow due to tidal effects, which affects tremendously, the sediment intake into the estuarine waters. In the current research, existing models are modified by incorpora ting the missing lateral inflow parameters, which are peculiar to the Niger Delta environment, to obtain more accurate model results. Details are given herein, of the deve lopment and application of a 3-dimensional numerical model (EKU 2.8 Models to predict sediment concentration distribution (total suspended sediment & bed sediment load s in the Niger Delta estuarine canals, with Ekulama well 19 access canal as a case study. The approach in this paper involved coupling a sediment transport equation (w ith the inclusion of lateral inflow parameters, with an estuarine hydro-dy namics equation to generate a generic 3- dimensional sediment concentration distribu tion model, using deterministic approach. Predicted results using this model compar ed favorably with measured field results. Average sediment concentration of 29mg/l was obtained compared with 31mg/l measured in the field for bed sediment loads. Finally, the predicted sediment concentration distribution (TSS, when comp ared with field results, gave average correlation coefficient of 0.9.; hence, the present model will assist in generating adequate information /data on sediment ch aracteristics and transport mechanism, required for effective design of canals to redu ce rate of siltation. The application of the above knowledge/parameters generated from this model to effectively design canals to reduce siltation will be treated in subsequent articles.

  6. DNA replication, repair, and repair tests. [Rat; human leukocytes

    Energy Technology Data Exchange (ETDEWEB)

    Lambert, B.

    1980-09-01

    The rate of inhibition and recovery of DNA synthesis can be used in a rapid assay system to detect genotoxic potentials of chemicals. Also, the observation that an agent stimulates DNA repair in a test system indicates its ability to cause damage in DNA. Different experimental approaches to the study of repair synthesis are discussed.

  7. Ecological consequences of dredged material disposal in the marine environment: a holistic assessment of activities around the England and Wales coastline.

    Science.gov (United States)

    Bolam, S G; Rees, H L; Somerfield, P; Smith, R; Clarke, K R; Warwick, R M; Atkins, M; Garnacho, E

    2006-04-01

    This study provides a holistic perspective on the ecological effects of dredged material disposal, both intertidally and subtidally. A number of numerical techniques (univariate, distributional, multivariate and meta-analysis) were used to assess impacts at 18 different disposal sites. The analyses revealed that ecological effects associated with dredged material disposal were dependent on the numerical techniques used, and that impacts were disposal-site specific. Disposal-site communities were generally faunistically impoverished to varying degrees, and impacts following intertidal placement were comparable to those of subtidal placement. We conclude that any assessment of the consequences of dredged material disposal to the coastal environment must take account of site-specific variation in prevailing hydrographic regimes and in ecological status, along with information on the disposal activity itself (mode, timing, quantity, frequency and type of material). As would be expected, variability in the latter presents a significant challenge in attempts to generalise about environmental and ecological impacts.

  8. The influence of environmental factors and dredging on chironomid larval diversity in urban drainage systems in polders strongly influenced by seepage from large rivers

    DEFF Research Database (Denmark)

    Vermonden, K.; Brodersen, Klaus Peter; Jacobsen, Dean

    2011-01-01

    Interest in the biodiversity value of urban waters is growing. Understanding key ecological processes is essential for effective management of these aquatic ecosystems. Our paper focuses on identifying the key factors that structure chironomid assemblages, such as water quality and dredging...... factors. Taxon richness, Shannon index (H'), rareness of species, and life-history strategies at urban locations were compared with available data from similar man-made water bodies in rural areas, and the effectiveness of dredging for restoring chironomid diversity in urban waters was tested. Three...... transparency. Chironomid taxon richness and H' were similar in urban and rural waters, probably because of their similar hydrologic, morphologic, and water-quality conditions and their similar dredging and weed-control regimes. Rareness was slightly higher in urban than in rural waters. In urban water systems...

  9. Biologics for tendon repair.

    Science.gov (United States)

    Docheva, Denitsa; Müller, Sebastian A; Majewski, Martin; Evans, Christopher H

    2015-04-01

    Tendon injuries are common and present a clinical challenge to orthopedic surgery mainly because these injuries often respond poorly to treatment and require prolonged rehabilitation. Therapeutic options used to repair ruptured tendons have consisted of suture, autografts, allografts, and synthetic prostheses. To date, none of these alternatives has provided a successful long-term solution, and often the restored tendons do not recover their complete strength and functionality. Unfortunately, our understanding of tendon biology lags far behind that of other musculoskeletal tissues, thus impeding the development of new treatment options for tendon conditions. Hence, in this review, after introducing the clinical significance of tendon diseases and the present understanding of tendon biology, we describe and critically assess the current strategies for enhancing tendon repair by biological means. These consist mainly of applying growth factors, stem cells, natural biomaterials and genes, alone or in combination, to the site of tendon damage. A deeper understanding of how tendon tissue and cells operate, combined with practical applications of modern molecular and cellular tools could provide the long awaited breakthrough in designing effective tendon-specific therapeutics and overall improvement of tendon disease management.

  10. Kvitebjoern gas pipeline repair - baptism of remote pipeline repair system

    Energy Technology Data Exchange (ETDEWEB)

    Gjertveit, Erling

    2010-07-01

    On the 1st of November 2007, severe anchor damage was discovered on the 30 inch Kvitebjoern gas export pipeline. The damage constituted a localised dent and a 17deg buckle, but no leakage. Statoil has invested in building an effective repair contingency structure for the large pipeline network on the Norwegian Continental shelf, with particular focus on the large gas export pipelines. The repair method for the Kvitebjoern pipeline was remotely operated using two Morgrip couplings and a spool. The installation used the purpose built Pipeline Repair System stored at Killingoey and couplings produced and tested back in 2005. This presentation will cover the initial damage investigations, the temporary operational phase, the repair preparations, the actual repair and lessons learned. (Author)

  11. Repairing split ends: SIRT6, mono-ADP ribosylation and DNA repair

    Science.gov (United States)

    Van Meter, Michael; Mao, Zhiyong; Gorbunova, Vera; Seluanov, Andrei

    2011-01-01

    The sirtuin gene family comprises an evolutionarily ancient set of NAD+ dependent protein deacetylase and mono-ADP ribosyltransferase enzymes. Found in all domains of life, sirtuins regulate a diverse array of biological processes, including DNA repair, gene silencing, apoptosis and metabolism. Studies in multiple model organisms have indicated that sirtuins may also function to extend lifespan and attenuate age-related pathologies. To date, most of these studies have focused on the deacetylase activity of sirtuins, and relatively little is known about the other biochemical activity of sirtuins, mono-ADP ribosylation. We recently reported that the mammalian sirtuin, SIRT6, mono-ADP ribosylates PARP1 to promote DNA repair in response to oxidative stress. In this research perspective we review the role of SIRT6 in DNA repair and discuss the emerging implications for sirtuin directed mono-ADP ribosylation in aging and age-related diseases. PMID:21946623

  12. Genetic and physiological factors affecting repair and mutagenesis in yeast

    Energy Technology Data Exchange (ETDEWEB)

    Lemontt, J F

    1979-01-01

    Current views of DNA repair and mutagenesis in the yeast Saccharomyces cerevisiae are discussed in the light of recent data and with emphasis on the isolation and characterization of genetically well-defined mutations that affect DNA metabolism in general (including replication and recombination). Various pathways of repair are described, particularly in relation to their imvolvement in mutagenic mechanisms. In addition to genetic control, certain physiological factors such as cell age, DNA replication, and the regulatory state of the mating-type locus are shown to also play a role in repair and mutagenesis.

  13. Genetic and physiological factors affecting repair and mutagenesis in yeast

    Energy Technology Data Exchange (ETDEWEB)

    Lemontt, J F

    1979-01-01

    Current views of DNA repair and mutagenesis in the yeast Saccharomyces cerevisiae are discussed in the light of recent data, and with emphasis on the isolation and characterization of genetically well-defined mutations that affect DNA metabolism in general (including replication and recombination). Various pathways of repair are described particularly in relation to their involvement in mutagenic mechanisms. In addition to genetic control, certain physiological factors such as cell age, DNA replication, and the regulatory state of the mating-type locus, are shown to also play a role in repair and mutagenesis.

  14. SIRT1 promotes DNA repair activity in response to radiation

    Energy Technology Data Exchange (ETDEWEB)

    Jeong, Jae-Min; Lee, Kee-Ho [Korea Institute of Radiological and Medical Sciences, Seoul (Korea, Republic of)

    2006-07-01

    Human SIRT1 controls various physiological responses including cell fate, stress, and aging, through deacetylation of its specific substrate protein. In processing DNA damage signaling, SIRT1 attenuates a cellular apoptotic response by deacetylation of p53 tumor suppressor. Ectopically over-expressed SIRT1 resulted in the increase of repair of DNA strand breakages produced by radiation. On the other hand, repression of endogenous SIRT1 expression by SIRT1 siRNA led to the decrease of this repair activity, indicating that SIRT1 can regulate DNA repair capacity of cells with DNA strand breaks.

  15. Radiological assessment of steam generator repair and replacement

    Energy Technology Data Exchange (ETDEWEB)

    Parkhurst, M.A.; Rathbun, L.A.; Murphy, D.W.

    1983-12-01

    Previous analyses of the radiological impact of removing and replacing corroded steam generators have been updated based on experience at Surry Units 1 and 2 and Turkey Point Units 3 and 4. The sleeving repairs of degraded tubes at San Onofre Unit 1, Point Beach Unit 2, and R.E. Ginna are also analyzed. Actual occupational doses incurred during application of the various technologies used in repairs have been included, along with radioactive waste quantities and constituents. Considerable progress has been made in improving radiation protection and reducing worker dose by the development of remotely controlled equipment and the implementation of dose reduction strategies that have been successful in previous repair operations.

  16. Observation of Clinical Effect of Acupuncture by Warming Governor Vessel and Dredging Yang for 50 Cases of Cervical Spondylopathy

    Institute of Scientific and Technical Information of China (English)

    胡厚君

    2007-01-01

    温督通阳针灸法能明显地改善微循环,消除颈部疼痛、改善颈部活动,采用该法治疗颈椎病50例,疗效满意.%Acupuncture method by warming the Governor Vessel and dredging yang can be used to improve microcirculation obviously, eliminate pain in the neck and improve the motion of the neck. In the treatment of 50 cases of cervical spondylopathy by this method,the therapeutic effect is satisfactory.

  17. Dungeness Crab Dredging Entrainment Studies in the Lower Columbia River, 2002 – 2004: Loss Projections, Salinity Model, and Scenario Analysis

    Energy Technology Data Exchange (ETDEWEB)

    Pearson, Walter H.; Williams, Greg D.; Skalski, John R.

    2005-01-01

    Dungeness crab studies conducted in 2002 for the Portland District of the U.S. Army Corps of Engineers (Corps) constituted a major step forward in quantifying crab entrainment through statistical projections of adult equivalent loss (AEL) and loss to the fishery (LF) from proposed construction and maintenance dredging in the Columbia River navigation channel (Pearson et al. 2002, 2003). These studies also examined the influence of bottom salinity on crab abundance and entrainment rates. Additional sampling was conducted in 2004 to tighten loss projections, further develop the crab salinity model, and apply the model to assess correlations of entrainment rates and projected losses with seasonal salinity changes.

  18. Mystery of DNA repair: the role of the MRN complex and ATM kinase in DNA damage repair.

    Science.gov (United States)

    Czornak, Kamila; Chughtai, Sanaullah; Chrzanowska, Krystyna H

    2008-01-01

    Genomes are subject to a number of exogenous or endogenous DNA-damaging agents that cause DNA double-strand breaks (DSBs). These critical DNA lesions can result in cell death or a wide variety of genetic alterations, including deletions, translocations, loss of heterozygosity, chromosome loss, or chromosome fusions, which enhance genome instability and can trigger carcinogenesis. The cells have developed an efficient mechanism to cope with DNA damages by evolving the DNA repair machinery. There are 2 major DSB repair mechanisms: nonhomologous end joining (NHEJ) and homologous recombination (HR). One element of the repair machinery is the MRN complex, consisting of MRE11, RAD50 and NBN (previously described as NBS1), which is involved in DNA replication, DNA repair, and signaling to the cell cycle checkpoints. A number of kinases, like ATM (ataxia-telangiectasia mutated), ATR (ataxia-telangiectasia and Rad-3-related), and DNA PKcs (DNA protein kinase catalytic subunit), phosphorylate various protein targets in order to repair the damage. If the damage cannot be repaired, they direct the cell to apoptosis. The MRN complex as well as repair kinases are also involved in telomere maintenance and genome stability. The dysfunction of particular elements involved in the repair mechanisms leads to genome instability disorders, like ataxia telangiectasia (A-T), A-T-like disorder (ATLD) and Nijmegen breakage syndrome (NBS). The mutated genes responsible for these disorders code for proteins that play key roles in the process of DNA repair. Here we present a detailed review of current knowledge on the MRN complex, kinases engaged in DNA repair, and genome instability disorders.

  19. Optical modulator including grapene

    Energy Technology Data Exchange (ETDEWEB)

    Liu, Ming; Yin, Xiaobo; Zhang, Xiang

    2016-06-07

    The present invention provides for a one or more layer graphene optical modulator. In a first exemplary embodiment the optical modulator includes an optical waveguide, a nanoscale oxide spacer adjacent to a working region of the waveguide, and a monolayer graphene sheet adjacent to the spacer. In a second exemplary embodiment, the optical modulator includes at least one pair of active media, where the pair includes an oxide spacer, a first monolayer graphene sheet adjacent to a first side of the spacer, and a second monolayer graphene sheet adjacent to a second side of the spacer, and at least one optical waveguide adjacent to the pair.

  20. Handbook of adhesive bonded structural repair

    CERN Document Server

    Wegman, Raymond F

    1992-01-01

    Provides repair methods for adhesive bonded and composite structures; identifies suitable materials and equipment for repairs; describes damage evaluation criteria and techniques, and methods of inspection before and after repair.

  1. Clamp wins pipe repair prize

    Energy Technology Data Exchange (ETDEWEB)

    Anon.

    2001-04-01

    This paper describes the permanent pipeline repair system, developed by Tekmar, which is powered by seawater hydraulics and is easily installed and tested by any workclass remotely operated vehicle (rov). Details are given of the two main components of the system, namely, the diverless high pressure split repair clamp and the rov-operated tool to install it.

  2. The journey of DNA repair

    OpenAIRE

    Saini, Natalie

    2015-01-01

    21 years ago, the DNA Repair Enzyme was declared “Molecule of the Year”. Today, we are celebrating another “year of repair”, with the 2015 Nobel Prize in Chemistry being awarded to Aziz Sancar, Tomas Lindahl and Paul Modrich for their collective work on the different DNA repair pathways.

  3. Nucleotide excision repair in yeast

    NARCIS (Netherlands)

    Eijk, Patrick van

    2012-01-01

    Nucleotide Excision Repair (NER) is a conserved DNA repair pathway capable of removing a broad spectrum of DNA damage. In human cells a defect in NER leads to the disorder Xeroderma pigmentosum (XP). The yeast Saccharomyces cerevisiae is an excellent model organism to study the mechanism of NER. The

  4. Visual Impairment, Including Blindness

    Science.gov (United States)

    ... Who Knows What? Survey Item Bank Search for: Visual Impairment, Including Blindness Links updated, April 2017 En ... doesn’t wear his glasses. Back to top Visual Impairments in Children Vision is one of our ...

  5. Open aortic surgery after thoracic endovascular aortic repair.

    Science.gov (United States)

    Coselli, Joseph S; Spiliotopoulos, Konstantinos; Preventza, Ourania; de la Cruz, Kim I; Amarasekara, Hiruni; Green, Susan Y

    2016-08-01

    In the last decade, thoracic endovascular aortic aneurysm repair (TEVAR) has emerged as an appealing alternative to the traditional open aortic aneurysm repair. This is largely due to generally improved early outcomes associated with TEVAR, including lower perioperative mortality and morbidity. However, it is relatively common for patients who undergo TEVAR to need a secondary intervention. In select circumstances, these secondary interventions are performed as an open procedure. Although it is difficult to assess the rate of open repairs after TEVAR, the rates in large series of TEVAR cases (>300) have ranged from 0.4 to 7.9 %. Major complications of TEVAR that typically necessitates open distal aortic repair (i.e., repair of the descending thoracic or thoracoabdominal aorta) include endoleak (especially type I), aortic fistula, endograft infection, device collapse or migration, and continued expansion of the aneurysm sac. Conversion to open repair of the distal aorta may be either elective (as for many endoleaks) or emergent (as for rupture, retrograde complicated dissection, malperfusion, and endograft infection). In addition, in select patients (e.g., those with a chronic aortic dissection), unrepaired sections of the aorta may progressively dilate, resulting in the need for multiple distal aortic repairs. Open repairs after TEVAR can be broadly classified as full extraction, partial extraction, or full salvage of the stent-graft. Although full and partial stent-graft extraction imply failure of TEVAR, such failure is generally absent in cases where the stent-graft can be fully salvaged. We review the literature regarding open repair after TEVAR and highlight operative strategies.

  6. Endovascular repair of blunt popliteal arterial injuries

    Energy Technology Data Exchange (ETDEWEB)

    Zhong, Shan; Zhang, Xiquan; Chen, Zhong; Zhu, Wei; Pan, Xiaolin [Dept. of nterventional Vascular, The 148th Hospital of Chinese People' s Liberation Army, Zibo (China); Dong, Peng; Sun, Yequan [Dept. of Medical Imaging, Weifang Medical University, Weifang (China); Qi, Deming [Dept. of Medical Imaging, Qilu Medical University, Zibo (China)

    2016-09-15

    To evaluate the feasibility and effectiveness of endovascular repair for blunt popliteal arterial injuries. A retrospective analysis of seven patients with clinical suspicion of popliteal arterial injuries that were confirmed by arteriography was performed from September 2009 to July 2014. Clinical data included demographics, mechanism of injury, type of injury, location of injury, concomitant injuries, time of endovascular procedures, time interval from trauma to blood flow restoration, instrument utilized, and follow-up. All patients were male (mean age of 35.9 ± 10.3 years). The type of lesion involved intimal injury (n = 1), partial transection (n = 2), complete transection (n = 2), arteriovenous fistula (n = 1), and pseudoaneurysm (n = 1). All patients underwent endovascular repair of blunt popliteal arterial injuries. Technical success rate was 100%. Intimal injury was treated with a bare-metal stent. Pseudoaneurysm and popliteal artery transections were treated with bare-metal stents. Arteriovenous fistula was treated with bare-metal stent and coils. No perioperative death and procedure-related complication occurred. The average follow-up was 20.9 ± 2.3 months (range 18–24 months). One patient underwent intra-arterial thrombolysis due to stent thrombosis at 18 months after the procedure. All limbs were salvaged. Stent migration, deformation, or fracture was not found during the follow-up. Endovascular repair seems to be a viable approach for patients with blunt popliteal arterial injuries, especially on an emergency basis. Endovascular repair may be effective in the short-term. Further studies are required to evaluate the long-term efficacy of endovascular repair.

  7. DNA repair in neurons: So if they don't divide what's to repair?

    Energy Technology Data Exchange (ETDEWEB)

    Fishel, Melissa L. [Department of Pediatrics (Section of Hematology/Oncology), Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, 1044 W. Walnut, Room 302C, Indianapolis, IN 46202 (United States); Vasko, Michael R. [Department of Pharmacology and Toxicology, Indiana University School of Medicine, 1044 W. Walnut St., Indianapolis, IN 46202 (United States); Kelley, Mark R. [Department of Pediatrics (Section of Hematology/Oncology), Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, 1044 W. Walnut, Room 302C, Indianapolis, IN 46202 (United States) and Department of Pharmacology and Toxicology, Indiana University School of Medicine, 1044 W. Walnut St., Indianapolis, IN 46202 (United States) and Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, 1044 W. Walnut, Room 302C, Indianapolis, IN 46202 (United States)]. E-mail: mkelley@iupui.edu

    2007-01-03

    Neuronal DNA repair remains one of the most exciting areas for investigation, particularly as a means to compare the DNA repair response in mitotic (cancer) vs. post-mitotic (neuronal) cells. In addition, the role of DNA repair in neuronal cell survival and response to aging and environmental insults is of particular interest. DNA damage caused by reactive oxygen species (ROS) such as generated by mitochondrial respiration includes altered bases, abasic sites, and single- and double-strand breaks which can be prevented by the DNA base excision repair (BER) pathway. Oxidative stress accumulates in the DNA of the human brain over time especially in the mitochondrial DNA (mtDNA) and is proposed to play a critical role in aging and in the pathogenesis of several neurological disorders including Parkinson's disease, ALS, and Alzheimer's diseases. Because DNA damage accumulates in the mtDNA more than nuclear DNA, there is increased interest in DNA repair pathways and the consequence of DNA damage in the mitochondria of neurons. The type of damage that is most likely to occur in neuronal cells is oxidative DNA damage which is primarily removed by the BER pathway. Following the notion that the bulk of neuronal DNA damage is acquired by oxidative DNA damage and ROS, the BER pathway is a likely area of focus for neuronal studies of DNA repair. BER variations in brain aging and pathology in various brain regions and tissues are presented. Therefore, the BER pathway is discussed in greater detail in this review than other repair pathways. Other repair pathways including direct reversal, nucleotide excision repair (NER), mismatch repair (MMR), homologous recombination and non-homologous end joining are also discussed. Finally, there is a growing interest in the role that DNA repair pathways play in the clinical arena as they relate to the neurotoxicity and neuropathy associated with cancer treatments. Among the numerous side effects of cancer treatments, major

  8. Dredging of sand from a creek adjacent to a sand-spit for reclamation: Its impact on spit stability and coastal zone

    Digital Repository Service at National Institute of Oceanography (India)

    Rajagopal, M.D.; Vethamony, P.; Ilangovan, D.; Jayakumar, S.; Sudheesh, K.; Murty, K.S.R.

    . Mangroves are not present in the study area; patches of casuarina and cashew trees are observed towards land as well as on the sand spit (Anonymous, 1999). September 8, 2007 5:43 RPS mtec07_new Dredging of Sand from a Creek Adjacent to a Sand...-Spit for Reclamation 465 3. Results and Discussion 3.1. Estimation of quantum of sand that can be obtained from zones-I and II The post-dredging bathymetry of 2000 (Fig. 1) when compared with the bathymetry of 2005 shows that the deposition is in the range of 0.4–1.2 m...

  9. Combined epigastric hernia repair and mini-abdominoplasty. Case report

    Directory of Open Access Journals (Sweden)

    Grella Roberto

    2015-01-01

    Full Text Available The objectives of abdominal hernia repair are to restore the structural integrity of the abdominal wall. Current techniques include primary closure, staged repair and the use of prosthetic materials. Techniques for mini-abdominoplasty include the use of the transverse lower abdominal incision and the resection of excess skin. We report a case of epigastric hernia repair through a transverse lower abdominal incision with the resection of excess of skin. Our purpose is to evaluate the results of the procedure by incorporating these aspects into an epigastric hernia repair, we found out that the procedures are made safer and the results are improved. Proper indication and details of the technique are described.

  10. Rethinking transcription coupled DNA repair.

    Science.gov (United States)

    Kamarthapu, Venu; Nudler, Evgeny

    2015-04-01

    Nucleotide excision repair (NER) is an evolutionarily conserved, multistep process that can detect a wide variety of DNA lesions. Transcription coupled repair (TCR) is a subpathway of NER that repairs the transcribed DNA strand faster than the rest of the genome. RNA polymerase (RNAP) stalled at DNA lesions mediates the recruitment of NER enzymes to the damage site. In this review we focus on a newly identified bacterial TCR pathway in which the NER enzyme UvrD, in conjunction with NusA, plays a major role in initiating the repair process. We discuss the tradeoff between the new and conventional models of TCR, how and when each pathway operates to repair DNA damage, and the necessity of pervasive transcription in maintaining genome integrity. Copyright © 2015 Elsevier Ltd. All rights reserved.

  11. Chronic Pain after Inguinal Hernia Repair

    OpenAIRE

    2014-01-01

    Background. Chronic postherniorrhaphy groin pain is defined as pain lasting >6 months after surgery, which is one of the most important complications occurring after inguinal hernia repair, which occurs with greater frequency than previously thought. Material and Methods. Patients undergoing elective inguinal hernioplasty in Victoria Hospital from November 2011 to May 2013 were included in the study. A total of 227 patients met the inclusion criteria and were available for followup at end of ...

  12. Repairing Peripheral Nerves: Is there a Role for Carbon Nanotubes?

    Science.gov (United States)

    Oprych, Karen M; Whitby, Raymond L D; Mikhalovsky, Sergey V; Tomlins, Paul; Adu, Jimi

    2016-06-01

    Peripheral nerve injury continues to be a major global health problem that can result in debilitating neurological deficits and neuropathic pain. Current state-of-the-art treatment involves reforming the damaged nerve pathway using a nerve autograft. Engineered nerve repair conduits can provide an alternative to the nerve autograft avoiding the inevitable tissue damage caused at the graft donor site. Commercially available nerve repair conduits are currently only considered suitable for repairing small nerve lesions; the design and performance of engineered conduits requires significant improvements to enable their use for repairing larger nerve defects. Carbon nanotubes (CNTs) are an emerging novel material for biomedical applications currently being developed for a range of therapeutic technologies including scaffolds for engineering and interfacing with neurological tissues. CNTs possess a unique set of physicochemical properties that could be useful within nerve repair conduits. This progress report aims to evaluate and consolidate the current literature pertinent to CNTs as a biomaterial for supporting peripheral nerve regeneration. The report is presented in the context of the state-of-the-art in nerve repair conduit design; outlining how CNTs may enhance the performance of next generation peripheral nerve repair conduits.

  13. Reward optimization of a repairable system

    Energy Technology Data Exchange (ETDEWEB)

    Castro, I.T. [Departamento de Matematicas, Facultad de Veterinaria, Universidad de Extremadura, Avenida de la Universidad, s/n. 10071 Caceres (Spain)]. E-mail: inmatorres@unex.es; Perez-Ocon, R. [Departamento de Estadistica e Investigacion Operativa, Facultad de Ciencias, Universidad de Granada, Avenida de Severo Ochoa, s/n. 18071 Granada (Spain)]. E-mail: rperezo@ugr.es

    2006-03-15

    This paper analyzes a system subject to repairable and non-repairable failures. Non-repairable failures lead to replacement of the system. Repairable failures, first lead to repair but they lead to replacement after a fixed number of repairs. Operating and repair times follow phase type distributions (PH-distributions) and the pattern of the operating times is modelled by a geometric process. In this context, the problem is to find the optimal number of repairs, which maximizes the long-run average reward per unit time. To this end, the optimal number is determined and it is obtained by efficient numerical procedures.

  14. Wound repair in Pocillopora

    Science.gov (United States)

    Rodríguez-Villalobos, Jenny Carolina; Work, Thierry M.; Calderon-Aguileraa, Luis Eduardo

    2016-01-01

    Corals routinely lose tissue due to causes ranging from predation to disease. Tissue healing and regeneration are fundamental to the normal functioning of corals, yet we know little about this process. We described the microscopic morphology of wound repair in Pocillopora damicornis. Tissue was removed by airbrushing fragments from three healthy colonies, and these were monitored daily at the gross and microscopic level for 40 days. Grossly, corals healed by Day 30, but repigmentation was not evident at the end of the study (40 d). On histology, from Day 8 onwards, tissues at the lesion site were microscopically indistinguishable from adjacent normal tissues with evidence of zooxanthellae in gastrodermis. Inflammation was not evident. P. damicornis manifested a unique mode of regeneration involving projections of cell-covered mesoglea from the surface body wall that anastomosed to form gastrovascular canals.

  15. Groin hernia repair

    DEFF Research Database (Denmark)

    Kehlet, Henrik; Aasvang, Eske

    2005-01-01

    The choice of anesthesia for groin hernia repair is between general, regional (epidural or spinal), and local anesthesia. Existing data from large consecutive patient series and randomized studies have shown local anesthesia to be the method of choice because it can be performed by the surgeon......, does not necessarily require an attending anesthesiologist, translates into the shortest recovery (bypassing the postanesthesia care unit), has the lowest cost, and has the lowest postoperative morbidity regarding risk of urinary retention. Spinal anesthesia has no documented benefits for this small...... scientific data to support the choice of anesthesia, large epidemiologic and nationwide information from databases show an undesirable high (about 10-20%) use of spinal anesthesia and low (about 10%) use of local infiltration anesthesia. Surgeons and anesthesiologists should therefore adjust their anesthesia...

  16. Late repair of abductor avulsion after the transgluteal approach for hip arthroplasty.

    Science.gov (United States)

    Miozzari, Hermes H; Dora, Claudio; Clark, John M; Nötzli, Hubert P

    2010-04-01

    The abductor release sometimes does not heal after a transgluteal approach for hip arthroplasty. Factors influencing the success of subsequent repair are unclear. We used magnetic resonance imaging (MRI) to compare the condition of the gluteus medius with clinical outcome after late repair of abductor dehiscence in 12 total hip patients. Evaluation included a pain rating, gait evaluation, Trendelenburg test, strength grading, and Harris Hip Score. Most had both prerepair and postrepair MRI studies to assess the repair and to grade abductor muscle fatty degeneration. Two repairs without MRI were explored surgically. Although average pain, limp, and strength scores improved significantly, rerupture occurred in 4 subjects and fatty degeneration in the gluteus medius did not improve, even with intact repair. Nine patients were satisfied; 7 of these had an intact repair. Magnetic resonance imaging and operative observations suggest that chronic degeneration in the abductor mechanism is the major impediment to successful repair.

  17. Detecting, sourcing, and age-dating dredged sediments on the open shelf, southern California, using dead mollusk shells.

    Science.gov (United States)

    Bizjack, Matthew T; Kidwell, Susan M; Velarde, Ronald G; Leonard-Pingel, Jill; Tomašových, Adam

    2017-01-15

    Molluscan shell debris is an under-exploited means of detecting, sourcing, and age-dating dredged sediments in open-shelf settings. Backscatter features on the Southern California shelf are suggestive of dredged sediment hauled from San Diego Bay but deposited significantly inshore of the EPA-designated ocean disposal site. We find that 36% of all identifiable bivalve shells >2mm (44% of shells >4mm) in sediment samples from this 'short dump' area are from species known to live exclusively in the Bay; such shells are absent at reference sites of comparable water depth, indicating that their presence in the short-dump area signals non-compliant disposal rather than natural offshore transport or sea level rise. These sediments lack the shells of species that invaded California bays in the 1970s, suggesting that disposal preceded federal regulations. This inexpensive, low-tech method, with its protocol for rejecting alternative hypotheses, will be easy to adapt in other settings. Copyright © 2016 Elsevier Ltd. All rights reserved.

  18. Analysis of historical MERIS and MODIS data to evaluate the impact of dredging to monthly mean surface TSM concentration

    Science.gov (United States)

    Raag, L.; Uiboupin, R.; Sipelgas, L.

    2013-10-01

    We studied the changes of total suspended matter (TSM) distribution in Estonian coastal sea with special focus onPaldiskiharbor at the Pakri Bay (SW Gulf Of Finland). The purpose of current study was to examine the suitability of remote sensing data for detection of turbidity differences caused by dredged sediments on monthly mean surface TSM concentration, retrieved from satellite images. The MERIS (FSG) products with 300m resolution and MODIS band 1 data with 250m resolution from years 2006-2010 were used in theanalysis. MERIS images were processed using the Case-2 water processors available in BEAM software. Validation of the two processors (C2R and FUB) with in situ measurements of TSM gave reliable correlation between satellite data and in situ TSM measurements: r2 was 0.43 for FUB processor and 0.47 for C2R processor. An empirical algorithm was established for conversion of MODIS band 1 reflectance (620-670 nm) data to TSM concentration. We found reliable (r2=0.43) relationship between MODIS reflectance at band 1and TSM concentration measured fromwater samples. The monthly average TSM maps in the harbor region were calculated from MERIS and MODIS data using validated conversion algorithms in order to describe TSM variability and to analyzeenvironmental impact of dredging.

  19. Planting woody crops on dredged contaminated sediment provides both positive and negative effects in terms of remediation

    Energy Technology Data Exchange (ETDEWEB)

    Hartley, William, E-mail: w.hartley@salford.ac.uk [School of Computing, Science and Engineering, University of Salford, Cockcroft Building, Salford M5 4WT (United Kingdom); Riby, Philip [School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF (United Kingdom); Dickinson, Nicholas M. [Department of Ecology, Lincoln University, Lincoln 7647, Canterbury (New Zealand); Shutes, Brian [Urban Pollution Research Centre, Department of Natural Sciences, Middlesex University, Hendon, London NW4 4BT (United Kingdom); Sparke, Shaun [School of Pharmacy and Biomolecular Sciences, Liverpool John Moores University, Byrom Street, Liverpool L3 3AF (United Kingdom); Scholz, Miklas [School of Computing, Science and Engineering, University of Salford, Cockcroft Building, Salford M5 4WT (United Kingdom)

    2011-12-15

    There is currently a requirement for studies focusing on the long-term sustainability of phytoremediation technologies. Trace element uptake by Salix, Populus and Alnus species planted in dredged contaminated canal sediment and concentrations in sediment and pore waters were investigated, eight years after a phytoremediation trial was initiated in NW England. Soil biological activity was also measured using invertebrate and microbial assays to determine soil quality improvements. Zinc was the dominant trace metal in foliage and woody stems, and the most mobile trace element in sediment pore water ({approx}14 mg l{sup -1}). Biological activity had improved; earthworm numbers had increased from 5 to 24, and the QBS index (an index of microarthropod groups in soil) had increased from 70 to 88. It is concluded that biological conditions had improved and natural processes appear to be enhancing soil quality, but there remains a potential risk of trace element transfer to the wider environment. - Highlights: > Trees provide positive and negative effects for remediation of dredged sediment. > Biological conditions had improved and natural processes enhance soil quality. > Zinc was the dominant trace metal in foliage and sediment pore waters. > Metal contaminants remain a problem in relation to their wider environmental fate. > A sustainable environment appears to be forming as a result of natural attenuation. - Soil biological quality improves in a woody crop stand eight years after a phytoremediation trial.

  20. Heavy Metal Uptake, Translocation, and Bioaccumulation Studies of Triticum aestivum Cultivated in Contaminated Dredged Materials

    Directory of Open Access Journals (Sweden)

    Gregorio Begonia

    2005-08-01

    Full Text Available Phytoremediation is a technology that uses vegetation to remediate contaminants from water, soil, and sediments. Unlike traditional remediation techniques such as soil washing or vitrification, phytoremediation offers a technology that is solar-driven, aesthetically pleasing, and cost effective. Recent studies indicate that winter wheat (Triticum aestivum L. is a potential accumulator for heavy metals such as lead (Pb and cadmium (Cd in hydroponic systems. Based on these findings, a laboratory study was conducted with the primary objective of determining the phytoaccumulation capability of this plant species for heavy metals from contaminated dredged materials (DMs originating from two confined disposal facilities (CDF. The United States Army Corps of Engineers (USACE manages several hundred million cubic meters of DMs each year, and 5 to 10 % of these DMs require special handling because they are contaminated with hazardous substances that can move from the substrates into food webs causing unacceptable risk outside CDFs. Phytoremediation may offer an alternative to decrease this risk. Chemical analyses by USACE personnel identified 17 metals in various DMs, but in this present study, only zinc (Zn and Cd were investigated. Pre-germinated seeds of the test plants were planted under laboratory conditions in pots containing the various DMs and reference soil. Four weeks after planting, plants were harvested and separated into roots and shoots for biomass production and tissue metal concentrations analyses. Results showed that T. aestivum plants have the capacity to tolerate and grow in multiple-metal contaminated DMs with the potential of accumulating various amounts of Zn and Cd. Root and shoot biomass of T. aestivum were not significantly affected by the DMs on which the plants were grown suggesting that this plant species can grow just as well on DMs contaminated by various metals as in the reference soil. No significant differences in the Zn

  1. Heavy Metal Uptake, Translocation, and Bioaccumulation Studies of Triticum aestivum Cultivated in Contaminated Dredged Materials

    Science.gov (United States)

    Shumaker, Ketia L.; Begonia, Gregorio

    2005-01-01

    Phytoremediation is a technology that uses vegetation to remediate contaminants from water, soil, and sediments. Unlike traditional remediation techniques such as soil washing or vitrification, phytoremediation offers a technology that is solar-driven, aesthetically pleasing, and cost effective. Recent studies indicate that winter wheat (Triticum aestivum L.) is a potential accumulator for heavy metals such as lead (Pb) and cadmium (Cd) in hydroponic systems. Based on these findings, a laboratory study was conducted with the primary objective of determining the phytoaccumulation capability of this plant species for heavy metals from contaminated dredged materials (DMs) originating from two confined disposal facilities (CDF). The United States Army Corps of Engineers (USACE) manages several hundred million cubic meters of DMs each year, and 5 to 10 % of these DMs require special handling because they are contaminated with hazardous substances that can move from the substrates into food webs causing unacceptable risk outside CDFs. Phytoremediation may offer an alternative to decrease this risk. Chemical analyses by USACE personnel identified 17 metals in various DMs, but in this present study, only zinc (Zn) and Cd were investigated. Pre-germinated seeds of the test plants were planted under laboratory conditions in pots containing the various DMs and reference soil. Four weeks after planting, plants were harvested and separated into roots and shoots for biomass production and tissue metal concentrations analyses. Results showed that T. aestivum plants have the capacity to tolerate and grow in multiple-metal contaminated DMs with the potential of accumulating various amounts of Zn and Cd. Root and shoot biomass of T. aestivum were not significantly affected by the DMs on which the plants were grown suggesting that this plant species can grow just as well on DMs contaminated by various metals as in the reference soil. No significant differences in the Zn tissue

  2. Analytic device including nanostructures

    KAUST Repository

    Di Fabrizio, Enzo M.

    2015-07-02

    A device for detecting an analyte in a sample comprising: an array including a plurality of pixels, each pixel including a nanochain comprising: a first nanostructure, a second nanostructure, and a third nanostructure, wherein size of the first nanostructure is larger than that of the second nanostructure, and size of the second nanostructure is larger than that of the third nanostructure, and wherein the first nanostructure, the second nanostructure, and the third nanostructure are positioned on a substrate such that when the nanochain is excited by an energy, an optical field between the second nanostructure and the third nanostructure is stronger than an optical field between the first nanostructure and the second nanostructure, wherein the array is configured to receive a sample; and a detector arranged to collect spectral data from a plurality of pixels of the array.

  3. How to repair an episiotomy.

    Science.gov (United States)

    Steen, Mary; Cummins, Bernie

    2016-02-17

    Rationale and key points Skilful repair of an episiotomy is an important aspect of maternal health care. It is essential that midwives and doctors have the knowledge and skills to undertake this procedure in a safe and effective manner. ▶ An episiotomy should be repaired promptly to reduce blood loss and prevent infection. ▶ Repair of an episiotomy is undertaken in three stages: repair of the vaginal mucosa, repair of the muscle layer and repair of the skin layer. ▶ Adequate pain relief should be provided before suturing. Reflective activity Clinical skills articles can help update your practice and ensure it remains evidence based. Apply this article to your practice. Reflect on and write a short account of: 1. Why a rectal examination is recommended before and following repair of an episiotomy. 2. What you would do to improve your suturing skills. 3. The factors that may prevent or delay an episiotomy from healing. Subscribers can upload their reflective accounts at rcni.com/portfolio .

  4. Laser Engineered Net Shape (LENS) Technology for the Repair of Ni-Base Superalloy Turbine Components

    Science.gov (United States)

    Liu, Dejian; Lippold, John C.; Li, Jia; Rohklin, Stan R.; Vollbrecht, Justin; Grylls, Richard

    2014-09-01

    The capability of the laser engineered net shape (LENS) process was evaluated for the repair of casting defects and improperly machined holes in gas turbine engine components. Various repair geometries, including indentations, grooves, and through-holes, were used to simulate the actual repair of casting defects and holes in two materials: Alloy 718 and Waspaloy. The influence of LENS parameters, including laser energy density, laser scanning speed, and deposition pattern, on the repair of these defects and holes was studied. Laser surface remelting of the substrate prior to repair was used to remove machining defects and prevent heat-affected zone (HAZ) liquation cracking. Ultrasonic nondestructive evaluation techniques were used as a possible approach for detecting lack-of-fusion in repairs. Overall, Alloy 718 exhibited excellent repair weldability, with essentially no defects except for some minor porosity in repairs representative of deep through-holes and simulated large area casting defects. In contrast, cracking was initially observed during simulated repair of Waspaloy. Both solidification cracking and HAZ liquation cracking were observed in the repairs, especially under conditions of high heat input (high laser power and/or low scanning speed). For Waspaloy, the degree of cracking was significantly reduced and, in most cases, completely eliminated by the combination of low laser energy density and relatively high laser scanning speeds. It was found that through-hole repairs of Waspaloy made using a fine powder size exhibited excellent repair weldability and were crack-free relative to repairs using coarser powder. Simulated deep (7.4 mm) blind-hole repairs, representative of an actual Waspaloy combustor case, were successfully produced by the combination use of fine powder and relatively high laser scanning speeds.

  5. 自体骨髓间充质干细胞藻酸钙载体复合物对兔膝关节软骨缺损修复影响的实验研究%The experimental study of repairing effect after embedding compound including auto-bone marrow mesenchymal stem cells and calcium-algitate in rabbits articular genu defect

    Institute of Scientific and Technical Information of China (English)

    于灏; 辛畅泰

    2014-01-01

    Objective Cartilage tissue is mostly located at the important site of bones in human body, and the repair of its defect remains in suspense in clinical. With the development of the tissue engineering, it brings new approach for the repair of the defect of the articular cartilage. The researchs emphases on the ex vivo condition. Accordingly, scholars ignore the effect of improving the local micro-circumstances. Consequ-ently we add the bFGF and VitC in the micro-circumstances when embedding the carrier compound in order to improve the effect of the repair. Methods Bone marrow is obtained from the iliac bone of 20 rabbits respectively. As the seed cells, Mesenchymal Stem Cells are purified with the density gradient centrifugation and ampilifid. The cell suspension is prepared with the 3rd generation and bFGF/VitC, then finishing the carrier compound which is coincident with the articular cartilage full-thickness defect (diameter 4mm, depth 4mm) and embedding. The left articular genu defects are embedded with carrier compound as the experimental group (A), and the right embedded without bFGF/VitC as the group (B). The left articular genu defects of another 6 rabbits are given the implantation of calcium alginate exclusively as group (C), and the right defects remain blank as control group (D). Sacrificing the responding rabbits in the different time after operation(30d,60d,90d), and paraffin imbedding with routine methods and preparing the microtome section. Then observing the recovery result with the index of HE, Masson, Saffrine O, EM, Immunity-histchemistry. Results The chondro-defects in group A, B and C are filling with hyaline cartilage-similar tissue and fibre tissue. Hyaline cartilage-similar tissue in group A is much more than group B, and it is the lest in group C. With the time extending, the defects in group A are mostly fell with hyaline cartilage-similar. The boundary between normal circum-articular cartilage and filling tissue becomes illegible and the

  6. Regulation of DNA double-strand break repair pathway choice

    Institute of Scientific and Technical Information of China (English)

    Meena Shrivastav; Leyma P De Haro; Jac A Nickoloff

    2008-01-01

    DNA double-strand breaks (DSBs) are critical lesions that can result in cell death or a wide variety of genetic alterations including large- or small-scale deletions, loss of heterozygosity, translocations, and chromosome loss. DSBs are repaired by non-homologous end-joining (NHEJ) and homologous recombination (HR), and defects in these pathways cause genome instability and promote tumorigenesis. DSBs arise from endogenous sources includ-ing reactive oxygen species generated during cellular metabolism, collapsed replication forks, and nucleases, and from exogenous sources including ionizing radiation and chemicals that directly or indirectly damage DNA and are commonly used in cancer therapy. The DSB repair pathways appear to compete for DSBs, but the balance between them differs widely among species, between different cell types of a single species, and during different cell cycle phases of a single cell type. Here we review the regulatory factors that regulate DSB repair by NHEJ and HR in yeast and higher eukaryotes. These factors include regulated expression and phosphorylation of repair proteins, chromatin modulation of repair factor accessibility, and the availability of homologous repair templates. While most DSB repair proteins appear to function exclusively in NHEJ or HR, a number of proteins influence both pathways, including the MRE11/RAD50/NBS1 (XRS2) complex, BRCA1, histone H2AX, PARP-1, RAD18, DNA-dependent protein kinase catalytic subunit (DNA-PKcs), and ATM. DNA-PKcs plays a role in mammalian NHEJ, but it also influences HR through a complex regulatory network that may involve crosstalk with ATM, and the regulation of at least 12 proteins involved in HR that are phosphorylated by DNA-PKcs and/or ATM.

  7. DNA Repair Systems: Guardians of the Genome

    Indian Academy of Sciences (India)

    2016-10-01

    The 2015 Nobel Prize in Chemistry was awarded jointly to Tomas Lindahl, Paul Modrich and Aziz Sancar to honour their accomplishments in the field of DNA repair. Ever since the discovery of DNA structure and their importance in the storage of genetic information, questions about their stability became pertinent. A molecule which is crucial for the development and propagation of an organism must be closely monitored so that the genetic information is not corrupted. Thanks to the pioneering research work of Lindahl, Sancar, Modrich and their colleagues, we now have an holistic awareness of how DNA damage occurs and how the damage is rectified in bacteria as well as in higher organisms including human beings. A comprehensive understanding of DNA repair has proven crucial in the fight against cancer and other debilitating diseases.

  8. Biodegradable Materials for Bone Repairs: A Review

    Institute of Scientific and Technical Information of China (English)

    Lili Tan; Xiaoming Yu; Peng Wan; Ke Yang

    2013-01-01

    With attractive research and development of biomaterials,more and more opportunities have been brought to the treatments of human tissue repairs.The implant is usually no need to exist in the body accompanied with the recovery or regeneration of the tissue lesions,and the long-term effect of exotic substance to human body should be reduced as lower as possible.For this purpose,biodegradable materials,including polymers,magnesium alloys and ceramics,have attracted much attention for medical applications due to their biodegradable characters in body environment.This paper in turn introduces these three different types of widely studied biodegradable materials as well as their advantages as implants in applications for bone repairs.Relevant history and research progresses are summarized.

  9. Radiologic investigation after laparoscopic inguinal hernia repair

    Energy Technology Data Exchange (ETDEWEB)

    Larmark, Martin; Ekberg, Olle [Department of Diagnostic Radiology, Malmoe University Hospital, 205 02, Malmoe (Sweden); Montgomery, Agneta [Department of Surgery, Malmoe University Hospital, 205 02, Malmoe (Sweden)

    2003-12-01

    Laparoscopic instead of open surgical repair of inguinal hernias is becoming more frequent. Radiologists may expect different postoperative findings depending on the technique used. We studied how radiology had been used postoperatively and what findings were encountered after laparoscopic herniorraphy. Postoperative radiologic examinations related to hernia repair of all consecutive patients that had had laparoscopic herniorraphy in Malmoe University hospital between 1992 and 1998 were retrospectively evaluated. A total of 538 groins were included, 3.9% (n=21) of these were postoperatively examined with ultrasound (n=10), herniography (n=7), plain abdominal films (n=2), CT (n=1), or fistulography (n=1). Significant findings were found in five groins, namely, one sinus tract, two hematomas, one small bowel obstruction, and one recurrence of hernia. Four insignificant seromas were found. The characteristics of the findings and pitfalls are described. Symptoms resulting in radiologic examination are rare after laparoscopic herniorraphy. The radiologist must be familiar with the spectrum of such findings. (orig.)

  10. Emergent cardiopulmonary bypass during pectus excavatum repair

    Directory of Open Access Journals (Sweden)

    Ryan Craner

    2013-01-01

    Full Text Available Pectus excavatum is a chest wall deformity that produces significant cardiopulmonary disability and is typically seen in younger patients. Minimally invasive repair of pectus excavatum or Nuss procedure has become a widely accepted technique for adult and pediatric patients. Although it is carried out through a thoracoscopic approach, the procedure is associated with a number of potential intraoperative and post-operative complications. We present a case of cardiac perforation requiring emergent cardiopulmonary bypass in a 29-year-old male with Marfan syndrome and previous mitral valve repair undergoing a Nuss procedure for pectus excavatum. This case illustrates the importance of vigilance and preparation by the surgeons, anesthesia providers as well as the institution to be prepared with resources to handle the possible complications. This includes available cardiac surgical backup, perfusionist support and adequate blood product availability.

  11. Lessons learned using Snodgrass hypospadias repair.

    LENUS (Irish Health Repository)

    O'Connor, K M

    2012-02-03

    BACKGROUND: This is a review of our experience with the Snodgrass technique for distal hypospadias repair and we point to lessons learned in improving results. METHODS: We reviewed all patients who underwent Snodgrass hypospadias repair for distal hypospadias over a four-year period by a single surgeon. Chart review followed by parental telephone interview was used to determine voiding function, cosmesis and complication rate. RESULTS: Thirty children and three adults were identified. Age at surgery ranged from seven months to 39 years. The urinary stream was straight in 94%, and 97% reported a good or satisfactory final cosmetic outcome. One patient (3.3%) developed a urethral fistula and 21% developed meatal stenosis which required general anaesthetic. CONCLUSION: The Snodgrass urethroplasty provides satisfactory cosmetic and functional results. High rates of meatal stenosis initially encountered have improved with modifications to technique which include modified meatoplasty and routine meatal dilatation by the parents.

  12. 40 CFR 798.5500 - Differential growth inhibition of repair proficient and repair deficient bacteria: “Bacterial DNA...

    Science.gov (United States)

    2010-07-01

    ... repair proficient and repair deficient bacteria: âBacterial DNA damage or repair tests.â 798.5500 Section... inhibition of repair proficient and repair deficient bacteria: “Bacterial DNA damage or repair tests.” (a... killing or growth inhibition of repair deficient bacteria in a set of repair proficient and deficient...

  13. Bone repair and stem cells.

    Science.gov (United States)

    Ono, Noriaki; Kronenberg, Henry M

    2016-10-01

    Bones are an important component of vertebrates; they grow explosively in early life and maintain their strength throughout life. Bones also possess amazing capabilities to repair-the bone is like new without a scar after complete repair. In recent years, a substantial progress has been made in our understanding on mammalian bone stem cells. Mouse genetic models are powerful tools to understand the cell lineage, giving us better insights into stem cells that regulate bone growth, maintenance and repair. Recent findings about these stem cells raise new questions that require further investigations.

  14. Repairing and Upgrading Your PC

    CERN Document Server

    Thompson, Robert

    2009-01-01

    Repairing and Upgrading Your PC delivers start-to-finish instructions, simple enough for even the most inexperienced PC owner, for troubleshooting, repairing, and upgrading your computer. Written by hardware experts Robert Bruce Thompson and Barbara Fritchman Thompson, this book covers it all: how to troubleshoot a troublesome PC, how to identify which components make sense for an upgrade, and how to tear it all down and put it back together. This book shows how to repair and upgrade all of your PC's essential components.

  15. Laparoscopic repair of incisional hernia.

    Science.gov (United States)

    Lau, H; Lee, F; Patil, N G

    2001-09-01

    A 75-year-old man developed an incisional hernia over the upper abdomen following a wedge resection of a gastric stromal tumour in 1996. This is the first published report of a successful repair of an incisional hernia via a laparoscopic intraperitoneal on-lay technique using GORE-TEX DualMesh material in Hong Kong. Compared with conventional open repair of incisional hernia, long incisions and wound tension are avoided using the laparoscopic approach. This translates into a reduced risk of wound-related complications and facilitates recovery. In selected cases, minimally invasive surgery is a safe technique for the repair of incisional hernias.

  16. [Inguinal and femoral hernia repair].

    Science.gov (United States)

    Geissler, B; Anthuber, M

    2011-05-01

    With an incidence of 200,000 new cases per year in Germany, inguinal hernia has a significant socioeconomic impact. The 2009 guidelines from the European Hernia Society established treatment recommendations. Hernia repair is based on reinforcing the posterior wall of the inguinal canal by suture or mesh repair by an anterior or posterior approach. Lightweight mesh reduces recurrence rates and is the treatment of choice even in primary hernias. Laparoscopic hernia repair is associated with specific risks but is superior in postoperative pain and earlier return to work.

  17. Molecular mechanisms of DNA repair inhibition by caffeine

    Energy Technology Data Exchange (ETDEWEB)

    Selby, C.P.; Sancar, A. (Univ. of North Carolina School of Medicine, Chapel Hill (USA))

    1990-05-01

    Caffeine potentiates the mutagenic and lethal effects of genotoxic agents. It is thought that this is due, at least in some organisms, to inhibition of DNA repair. However, direct evidence for inhibition of repair enzymes has been lacking. Using purified Escherichia coli DNA photolyase and (A)BC excinuclease, we show that the drug inhibits photoreactivation and nucleotide excision repair by two different mechanisms. Caffeine inhibits photoreactivation by interfering with the specific binding of photolyase to damaged DNA, and it inhibits nucleotide excision repair by promoting nonspecific binding of the damage-recognition subunit, UvrA, of (A)BC excinuclease. A number of other intercalators, including acriflavin and ethidium bromide, appear to inhibit the excinuclease by a similar mechanism--that is, by trapping the UvrA subunit in nonproductive complexes on undamaged DNA.

  18. Ageing airplane repair assessment program for Airbus A300

    Science.gov (United States)

    Gaillardon, J. M.; Schmidt, HANS-J.; Brandecker, B.

    1992-01-01

    This paper describes the current status of the repair categorization activities and includes all details about the methodologies developed for determination of the inspection program for the skin on pressurized fuselages. For inspection threshold determination two methods are defined based on fatigue life approach, a simplified and detailed method. The detailed method considers 15 different parameters to assess the influences of material, geometry, size location, aircraft usage, and workmanship on the fatigue life of the repair and the original structure. For definition of the inspection intervals a general method is developed which applies to all concerned repairs. For this the initial flaw concept is used by considering 6 parameters and the detectable flaw sizes depending on proposed nondestructive inspection methods. An alternative method is provided for small repairs allowing visual inspection with shorter intervals.

  19. Role of poly(ADP-ribosepolymerase 2 in DNA repair

    Directory of Open Access Journals (Sweden)

    Lavrik O. I.

    2012-06-01

    Full Text Available Poly(ADP-ribosylation is a posttranslational protein modification significant for the genomic stability and cell survival in response to DNA damage. Poly(ADP-ribosylation is catalyzed by poly(ADP-ribosepolymerases (PARPs, which use NAD+ as a substrate, synthesize polymer of (ADP-ribose (PAR covalently attached to nuclear proteins including PARP themselves. PARPs constitute a large family of proteins, in which PARP1 is the most abundant and best-characterized member. In spite of growing body of PARPs’ role in cellular processes, PARP2, the closest homolog of PARP1, still remains poorly characterized at the level of its contribution to different pathways of DNA repair. An overview summarizes in vivo and in vitro data on PARP2 implication in specialized DNA repair processes, base excision repair and double strand break repair.

  20. Application of dynamic programming to structural repairing strategies

    Institute of Scientific and Technical Information of China (English)

    陈朝晖; LIU; Xila; 等

    2002-01-01

    A model of dynamic programming for repairing strategies of concrete structures during a projected service period is proposed,which takes into account the degradation in strength of components and the probability of accidental load.This model takes the safety grade of a structural system as the state variable of repairing strategies,and incorporates economic factors including expected repair cost,property loss due to structure failure,goods and material loss due to structure failure,loss of production interrupt due to structure failure,and inspection cost in decision making.It is found that the optimal repairing strategies are sensitive to the probability of accidental loads as well as the failure costs.The practicality of the model is demonstrated by an example.

  1. Large myelomeningocele repair

    Directory of Open Access Journals (Sweden)

    Farideh Nejat

    2011-01-01

    Full Text Available Background: Wound closure is accomplished in most cases of myelomeningocele (MMC by undermining of the skin edges surrounding the defect. However, large defects cannot be closed reliably by this simple technique. Due to the technical challenge associated with large MMC, surgeons have devised different methods for repairing large defects. In this paper, we report our experience of managing large defects, which we believe bears a direct relationship to decrease the incidence of wound complications. Materials and Methods: Forty children with large MMCs underwent surgical repair and represent our experience. We recommend using all hairy skin around the defect as a way to decrease the tension on the edges of the wound and the possible subsequent necrosis. It is our experience that vertical incision on one or two flanks parallel to the midline can decrease the tension of the wound. Moreover, ventriculo-peritoneal shunting for children who developed hydrocephalus was performed simultaneously, which constitutes another recommendation for preventing fluid collection and build up of pressure on the wound. Results: Patients in this study were in the age range of 2 days to 8 years. The most common location of MMC was in the thoracolumbar area. All but four patients had severe weakness in lower extremities. We used as much hairy skin around the MMC sac as possible in all cases. Vertical incisions on one or both flanks and simultaneous shunt procedure were performed in 36 patients. We treated children with large MMC defects with acceptable tension-free closure. Nonetheless, three patients developed superficial skin infection and partial wound dehiscence, and they were managed conservatively. Conclusions: We recommend using all hairy skin around the MMC defect for closure of large defects. In cases that were expected to be at a higher risk to develop dehiscence release incisions on one or two flanks towards the fascia were found to be useful. Simultaneous

  2. Biochemical ripening of dredged sediments. Part 2. Degradation of polycyclic aromatic hydrocarbons and total petroleum hydorcarbons in slurried and consolidated sediments

    NARCIS (Netherlands)

    Vermeulen, J.; Gool, van M.P.M.; Mentink, G.H.; Joziasse, J.; Bruning, H.; Grotenhuis, J.T.C.

    2007-01-01

    Ripening of polycyclic aromatic hydrocarbons (PAH) and total petroleum hydrocarbons (TPH) polluted dredged sediment can be considered as a bioremediation technique. Aerobic biodegradation of PAH and TPH was studied in five previously anaerobic-slurried sediments during a 350-d laboratory incubation

  3. Biochemical ripening of dredged sediments. Part 2. Degradation of polycyclic aromatic hydrocarbons and total petroleum hydorcarbons in slurried and consolidated sediments

    NARCIS (Netherlands)

    Vermeulen, J.; Gool, van M.P.M.; Mentink, G.H.; Joziasse, J.; Bruning, H.; Grotenhuis, J.T.C.

    2007-01-01

    Ripening of polycyclic aromatic hydrocarbons (PAH) and total petroleum hydrocarbons (TPH) polluted dredged sediment can be considered as a bioremediation technique. Aerobic biodegradation of PAH and TPH was studied in five previously anaerobic-slurried sediments during a 350-d laboratory incubation

  4. A Shift Toward Building with Nature in the Dredging and Port Development Industries: Managerial Implications for Projects in or Near Natura 2000 Areas

    NARCIS (Netherlands)

    Vikolainen, Vera; Bressers, Hans; Lulofs, Kris

    2014-01-01

    Building with Nature is a new approach to designing water infrastructure, one that seeks to realize socioeconomic project goals in harmony with the environment. The Dutch dredging industry is promoting its application in the Netherlands, but similar concepts are emerging internationally. The Working

  5. A Two-Unit Cold Standby Repairable System with One Replaceable Repair Facility and Delay Repair:Some Reliability Problems

    Institute of Scientific and Technical Information of China (English)

    WEI Ying-yuan; TANG Ying-hui

    2004-01-01

    This paper considers a two-unit same cold standby repairable system with a replaceable repair facility and delay repair .The failure time of unit is assumed to follow exponential distribution , and the repair time and delay time of failed unit are assumed to follow arbitrary distributions , whereas the failure and replacement time distributions of the repair facility are exponential and arbitrary . By using the Markov renewal process theory, some primary reliability quantities of the system are obtained.

  6. 40 CFR 63.1024 - Leak repair.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 10 2010-07-01 2010-07-01 false Leak repair. 63.1024 Section 63.1024... Standards for Equipment Leaks-Control Level 2 Standards § 63.1024 Leak repair. (a) Leak repair schedule. The owner or operator shall repair each leak detected as soon as practical, but not later than 15...

  7. 40 CFR 65.105 - Leak repair.

    Science.gov (United States)

    2010-07-01

    ... 40 Protection of Environment 15 2010-07-01 2010-07-01 false Leak repair. 65.105 Section 65.105... FEDERAL AIR RULE Equipment Leaks § 65.105 Leak repair. (a) Leak repair schedule. The owner or operator shall repair each leak detected as soon as practical but not later than 15 calendar days after it...

  8. 40 CFR 63.1005 - Leak repair.

    Science.gov (United States)

    2010-07-01

    ... successful repair of the leak. (3) Maximum instrument reading measured by Method 21 of 40 CFR part 60... 40 Protection of Environment 10 2010-07-01 2010-07-01 false Leak repair. 63.1005 Section 63.1005... Standards for Equipment Leaks-Control Level 1 § 63.1005 Leak repair. (a) Leak repair schedule. The owner...

  9. 新型渠道清淤技术与设备研究%Research on Dredging Technology and Equipment of New Channels

    Institute of Scientific and Technical Information of China (English)

    刘晓杰; 化晓锋; 陈伟; 张林

    2013-01-01

    国家重点水利工程南水北调工程、东调南下工程、引黄济青续建工程等建成后,部分干线渠道除调水外还要承担排涝泄洪的任务,泥沙淤积在所难免。根据南水北调东线工程混凝土衬砌输水渠道清淤,研制了一种通过吸泥系统、泥浆输送系统完成清淤疏浚任务的高度自动化的潜水疏浚机,可以接收岸上人员的指令或者自主判断水下淤泥的分布情形,并以此决定在水下的行走方式,实现转弯、避碍,控制自身在水中的方位。这种小型清淤设备可以应用于渠道、湖泊、航道的环保清淤、水库清淤、沉砂池清淤、河道治理等。同时这种清淤设备还能做到在水下清淤疏浚过程中不引起环境的二次污染,不造成断流,具有高效、节能、方便操作、劳动强度小,适应作业范围宽及低成本等优点。%With the developmentof the newnational key water conservancy projects such as the South-to-North Water Diversion Project, East-to-South Water Diversion Project, and Water Diversion Projectfrom YellowRiver to Qingdao, the main channels undertake notonly the water diversion duty butalso the drainage of flood discharge task;therefore sedimentdeposition occurs in these channels. Based on the dredging of water conveyance channel with concrete lining in the Eastern Route of South-to-North Water Diversion Project, an automatic dredging machine was developed to complete the dredging task through the dredge suc-tion system and transportsystem. The machine can receive the instructions of ashore personnel or perform independentjudg-mentto determine the distribution of dredge, and therefore decide its walking methods, turn and avoid obstacles, and control its position in water. The newchannel dredging equipmentis small and can be applied to the environmental protection dredging of channels, lakes, and waterways, reservoir sand basin dredging, and river management. Meanwhile, the

  10. Early days of DNA repair: discovery of nucleotide excision repair and homology-dependent recombinational repair.

    Science.gov (United States)

    Rupp, W Dean

    2013-12-13

    The discovery of nucleotide excision repair in 1964 showed that DNA could be repaired by a mechanism that removed the damaged section of a strand and replaced it accurately by using the remaining intact strand as the template. This result showed that DNA could be actively metabolized in a process that had no precedent. In 1968, experiments describing postreplication repair, a process dependent on homologous recombination, were reported. The authors of these papers were either at Yale University or had prior Yale connections. Here we recount some of the events leading to these discoveries and consider the impact on further research at Yale and elsewhere.

  11. Parametric studies on self-repairing approaches for resin infused composites subjected to low velocity impact

    Science.gov (United States)

    Motuku, M.; Vaidya, U. K.; Janowski, G. M.

    1999-10-01

    Low velocity impact response of glass reinforced polymer composites, which have the potential to self-repair both micro- and macro-damage, has been investigated. This class of material falls under the category of passive smart polymer composites. The self-repairing mechanism is achieved through the incorporation of hollow fibers in addition to the normal solid reinforcing fibers. The hollow fibers store the damage-repairing solution or chemicals that are released into the matrix or damaged zone upon fiber failure. Plain-weave S-2 glass fabric reinforcement, vinyl ester 411-C50 and EPON-862 epoxy resin systems were considered for this study. Different tubing materials were investigated for potential use as storage materials for the repairing chemicals instead of the actual hollow repair fibers and included borosilicate glass micro-capillary pipets, flint glass pasteur pipets, copper tubing and aluminum tubing. composite panels were fabricated by using a vacuum assisted resin transfer molding process. The present investigation addressed fabrication of self-repairing composite panels and some of the parameters that influence the response of self-repairing composites to impact loading. Specific issues addressed by this study include: the processing quality; the selection of storage material for the repairing solution; release and transportation of the repairing solution; the effect of the number, type and spatial distribution of the repairing tubes, specimen thickness, matrix material and impact energy level.

  12. The Impact of Hedgehog Signaling Pathway on DNA Repair Mechanisms in Human Cancer

    Directory of Open Access Journals (Sweden)

    Erhong Meng

    2015-07-01

    Full Text Available Defined cellular mechanisms have evolved that recognize and repair DNA to protect the integrity of its structure and sequence when encountering assaults from endogenous and exogenous sources. There are five major DNA repair pathways: mismatch repair, nucleotide excision repair, direct repair, base excision repair and DNA double strand break repair (including non-homologous end joining and homologous recombination repair. Aberrant activation of the Hedgehog (Hh signaling pathway is a feature of many cancer types. The Hh pathway has been documented to be indispensable for epithelial-mesenchymal transition, invasion and metastasis, cancer stemness, and chemoresistance. The functional transcription activators of the Hh pathway include the GLI proteins. Inhibition of the activity of GLI can interfere with almost all DNA repair types in human cancer, indicating that Hh/GLI functions may play an important role in enabling tumor cells to survive lethal types of DNA damage induced by chemotherapy and radiotherapy. Thus, Hh signaling presents an important therapeutic target to overcome DNA repair-enabled multi-drug resistance and consequently increase chemotherapeutic response in the treatment of cancer.

  13. The Impact of Hedgehog Signaling Pathway on DNA Repair Mechanisms in Human Cancer

    Energy Technology Data Exchange (ETDEWEB)

    Meng, Erhong; Hanna, Ann; Samant, Rajeev S.; Shevde, Lalita A., E-mail: lsamant@uab.edu [Department of Pathology, Comprehensive Cancer Center, University of Alabama at Birmingham, WTI320D, 1824 6th Avenue South, Birmingham, AL 35233 (United States)

    2015-07-21

    Defined cellular mechanisms have evolved that recognize and repair DNA to protect the integrity of its structure and sequence when encountering assaults from endogenous and exogenous sources. There are five major DNA repair pathways: mismatch repair, nucleotide excision repair, direct repair, base excision repair and DNA double strand break repair (including non-homologous end joining and homologous recombination repair). Aberrant activation of the Hedgehog (Hh) signaling pathway is a feature of many cancer types. The Hh pathway has been documented to be indispensable for epithelial-mesenchymal transition, invasion and metastasis, cancer stemness, and chemoresistance. The functional transcription activators of the Hh pathway include the GLI proteins. Inhibition of the activity of GLI can interfere with almost all DNA repair types in human cancer, indicating that Hh/GLI functions may play an important role in enabling tumor cells to survive lethal types of DNA damage induced by chemotherapy and radiotherapy. Thus, Hh signaling presents an important therapeutic target to overcome DNA repair-enabled multi-drug resistance and consequently increase chemotherapeutic response in the treatment of cancer.

  14. Timing of traumatic lumbar hernia repair: is delayed repair safe? Report of two cases and review of the literature.

    Science.gov (United States)

    Bathla, L; Davies, E; Fitzgibbons, R J; Cemaj, S

    2011-04-01

    Fewer than 100 cases of traumatic lumbar hernias are described in the English literature. The herniation has been described as a consequence of a combination of local tangential shearing forces combined with an acute increase in intra-abdominal pressure secondary to sudden deceleration sustained during blunt abdominal trauma. Delayed diagnosis is not uncommon, as nearly a quarter of these are missed at initial presentation. These hernias are best managed by operative intervention; however, there is no well-defined treatment strategy regarding either the timing or the type of repair. Several approaches, including laparoscopy, have been described to repair these defects. Various techniques, including primary repair, musculoaponeurotic reconstruction, and prosthetic mesh repair, have been described. These repairs are usually complicated because of the lack of musculoaponeurotic tissue inferiorly near the iliac crest. We describe here two cases of traumatic lumbar hernia managed by initial watchful waiting and subsequent elective repair using a combined laparoscopic and open technique and one with and one without bone anchor fixation.

  15. Umbilical and epigastric hernia repair.

    Science.gov (United States)

    Muschaweck, Ulrike

    2003-10-01

    The repair of umbilical and epigastric hernias still represents a challenge to surgeons. Although a common and relatively simple procedure, there is no exact protocol today on how the repair should be done. The Mayo technique and its alterations could not stand the test of time: a recurrence rate of 20% and higher is not acceptable for any surgical procedure. Although there is no consensus opinion, one thing is clear: the importance of an anatomic repair without tension and without an artificial enlargement of the defect. In 1987 Lichtenstein reported on 6321 cases of herniorraphy with a tension free repair, and in 1994 Stuart reemphasized that special importance in his editorial in the Lancet. A newer study from Brancato and coworkers in Italy also states the advantage of a tension-free prosthetic repair in 16 patients with epigastric hernia. We have gone even further and recommend a tailored-to-the-patient repair using a customized polypropylene mesh and a one-layer running suture. The advantages should be obvious: no artificial creation of an even bigger than original defect, a completely tension-free repair, and little to no recurrence of the hernia. Our results clearly prove that assumption. Moreover, the procedure is extremely safe and complications are very rare and minor. We conclude that using a mesh plug in a customized tension-free repair of umbilical and epigastric hernia shows many advantages over the commonly used methods. And we finally conclude with the words of Albert Einstein: "The only source of knowledge is experience."

  16. Repair Types, Procedures - Part 1

    Science.gov (United States)

    2010-05-01

    New Jersey, USA. Repair Types, Procedures – Part I RTO-EN-AVT-156 9 - 19 [5] Drieker R, Botello C, MacBeth S, and Grody J, “Aircraft Battle... MacBeth S, and Grody J, “Aircraft Battle Damage Assessment and Repair (ABDAR), Vol. III: Field Test Report,” AFRL-HE-WP-TR-2002-0039, July 2000. [8

  17. Hand function after nerve repair.

    OpenAIRE

    Lundborg, Göran; Rosén, Birgitta

    2007-01-01

    Treatment of injuries to major nerve trunks in the hand and upper extremity remains a major and challenging reconstructive problem. Such injuries may cause long-lasting disabilities in terms of lost fine sensory and motor functions. Nowadays there is no surgical repair technique that can ensure recovery of tactile discrimination in the hand of an adult patient following nerve repair while very young individuals usually regain a complete recovery of functional sensibility. Post-traumatic nerve...

  18. Cobbler's technique for Iridodialysis repair

    Directory of Open Access Journals (Sweden)

    Surinder Singh Pandav

    2016-01-01

    Full Text Available We describe a novel “Cobbler's technique” for iridodialysis repair in the right eye of a patient aged 18 years, with a traumatic iridodialysis secondary to open globe injury with an iron rod. Our technique is simple with easy surgical maneuvers, that is, effective for repairing iridodialysis. The “Cobbler's technique” allows a maximally functional and cosmetic result for iridodialysis.

  19. Rehabilitation after Rotator Cuff Repair.

    Science.gov (United States)

    Nikolaidou, Ourania; Migkou, Stefania; Karampalis, Christos

    2017-01-01

    Rotator cuff tears are a very common condition that is often incapacitating. Whether non-surgical or surgical, successful management of rotator cuff disease is dependent on appropriate rehabilitation. If conservative management is insufficient, surgical repair is often indicated. Postsurgical outcomes for patients having had rotator cuff repair can be quite good. A successful outcome is much dependent on surgical technique as it is on rehabilitation. Numerous rehabilitation protocols for the management of rotator cuff disease are based primarily on clinical experience and expert opinion. This article describes the different rehabilitation protocols that aim to protect the repair in the immediate postoperative period, minimize postoperative stiffness and muscle atrophy. A review of currently available literature on rehabilitation after arthroscopic rotator cuff tear repair was performed to illustrate the available evidence behind various postoperative treatment modalities. There were no statistically significant differences between a conservative and an accelerated rehabilitation protocol . Early passive range of motion (ROM) following arthroscopic cuff repair is thought to decrease postoperative stiffness and improve functionality. However, early aggressive rehabilitation may compromise repair integrity. The currently available literature did not identify any significant differences in functional outcomes and relative risks of re-tears between delayed and early motion in patients undergoing arthroscopic rotator cuff repairs. A gentle rehabilitation protocol with limits in range of motion and exercise times after arthroscopic rotator cuff repair would be better for tendon healing without taking any substantial risks. A close communication between the surgeon, the patient and the physical therapy team is important and should continue throughout the whole recovery process.

  20. Repairing Learned Knowledge Using Experience

    Science.gov (United States)

    1990-05-01

    It necessar and Identify by’ 6109h nii be) learning precedent-based learning knowledge repair explanation-based learning near - miss groups 20. ABSTRACT...can a program use explanations to repair a recollection, preventing further misapplication? Near - Miss Groups Isolate Suspicious Relations If a metal...pail differs from a porcelain cup only in the position of handle attachment, then we would say that the pail is a near miss . Unfortunately, there are

  1. p53 modulation of TFIIH-associated nucleotide excision repair activity

    NARCIS (Netherlands)

    X.W. Wang (Xin Wei); H. Yeh; L. Schaeffer; R. Roy (R.); V. Moncollin; J-M. Egly (Jean-Marc); Z. Wang (Z.); E.C. Friedberg (Errol); M.K. Evans; B.G. Taffe; V.A. Bohr; G. Weeda (Geert); J.H.J. Hoeijmakers (Jan); K. Forrester; C.C. Harris

    1995-01-01

    textabstractp53 has pleiotropic functions including control of genomic plasticity and integrity. Here we report that p53 can bind to several transcription factor IIH−associated factors, including transcription−repair factors, XPD (Rad3) and XPB, as well as CSB involved in strand−specific DNA repair,

  2. The impact of disposal of fine-grained sediments from maintenance dredging works on SPM concentration and fluid mud in and outside the harbor of Zeebrugge

    Science.gov (United States)

    Fettweis, Michael; Baeye, Matthias; Cardoso, Claudio; Dujardin, Arvid; Lauwaert, Brigitte; Van den Eynde, Dries; Van Hoestenberghe, Thomas; Vanlede, Joris; Van Poucke, Luc; Velez, Carlos; Martens, Chantal

    2016-11-01

    The amount of sediments to be dredged and disposed depends to a large part on the suspended particulate matter (SPM) concentration. Tidal, meteorological, climatological, and seasonal forcings have an influence on the horizontal and vertical distribution of the SPM in the water column and on the bed and control the inflow of fine-grained sediments towards harbors and navigation channels. About 3 million tons (dry matter) per year of mainly fine-grained sediments is dredged in the port of Zeebrugge and is disposed on a nearby disposal site. The disposed sediments are quickly resuspended and transported away from the site. The hypothesis is that a significant part of the disposed sediments recirculates back to the dredging places and that a relocation of the disposal site to another location at equal distance to the dredging area would reduce this recirculation. In order to validate the hypothesis, a 1-year field study was set up in 2013-2014. During 1 month, the dredged material was disposed at a new site. Variations in SPM concentration were related to tides, storms, seasonal changes, and human impacts. In the high-turbidity Belgian near-shore area, the natural forcings are responsible for the major variability in the SPM concentration signal, while disposal has only a smaller influence. The conclusion from the measurements is that the SPM concentration decreases after relocation of the disposal site but indicate stronger (first half of field experiment) or weaker (second half of field experiment) effects that are, however, supported by the environmental conditions. The results of the field study may have consequences on the management of disposal operations as the effectiveness of the disposal site depends on environmental conditions, which are inherently associated with chaotic behavior.

  3. Base excision repair in sugarcane

    Directory of Open Access Journals (Sweden)

    Agnez-Lima Lucymara F.

    2001-01-01

    Full Text Available DNA damage can be induced by a large number of physical and chemical agents from the environment as well as compounds produced by cellular metabolism. This type of damage can interfere with cellular processes such as replication and transcription, resulting in cell death and/or mutations. The low frequency of mutagenesis in cells is due to the presence of enzymatic pathways which repair damaged DNA. Several DNA repair genes (mainly from bacteria, yeasts and mammals have been cloned and their products characterized. The high conservation, especially in eukaryotes, of the majority of genes related to DNA repair argues for their importance in the maintenance of life on earth. In plants, our understanding of DNA repair pathways is still very poor, the first plant repair genes having only been cloned in 1997 and the mechanisms of their products have not yet been characterized. The objective of our data mining work was to identify genes related to the base excision repair (BER pathway, which are present in the database of the Sugarcane Expressed Sequence Tag (SUCEST Project. This search was performed by tblastn program. We identified sugarcane clusters homologous to the majority of BER proteins used in the analysis and a high degree of conservation was observed. The best results were obtained with BER proteins from Arabidopsis thaliana. For some sugarcane BER genes, the presence of more than one form of mRNA is possible, as shown by the occurrence of more than one homologous EST cluster.

  4. Scarf Repair of Composite Laminates

    Directory of Open Access Journals (Sweden)

    Xie Zonghong

    2016-01-01

    Full Text Available The use of composite materials, such as carbon-fiber reinforced plastic (CFRP composites, aero-structures has led to an increased need of advanced assembly joining and repair technologies. Adhesive bonded repairs as an alternative to recover full or part of initial strength were investigated. Tests were conducted with the objective of evaluating the effectiveness of techniques used for repairing damage fiber reinforced laminated composites. Failure loads and failure modes were generated and compared with the following parameters: scarf angles, roughness of grind tool and number of external plies. Results showed that scarf angle was the critical parameter and the largest tensile strength was observed with the smallest scarf angle. Besides, the use of external plies at the outer surface could not increase the repairs efficiency for large scarf angle. Preparing the repair surfaces by sanding them with a sander ranging from 60 to 100 grit number had significant effect on the failure load. These results allowed the proposal of design principles for repairing CFRP structures.

  5. How SUMOylation Fine-Tunes the Fanconi Anemia DNA Repair Pathway

    Directory of Open Access Journals (Sweden)

    Kate eColeman

    2016-04-01

    Full Text Available Fanconi Anemia (FA is a rare human genetic disorder characterized by developmental defects, bone marrow failure and cancer predisposition, primarily due to a deficiency in the repair of DNA interstrand crosslinks (ICLs. ICL repair through the FA DNA repair pathway is a complicated multi-step process, involving at least 19 FANC proteins and coordination of multiple DNA repair activities, including homologous recombination (HR, nucleotide excision repair (NER and translesion synthesis (TLS. SUMOylation is a critical regulator of several DNA repair pathways, however, the role of this modification in controlling the FA pathway is poorly understood. Here, we summarize recent advances in the fine-tuning of the FA pathway by SUMO-targeted ubiquitin ligases (STUbLs and other SUMO-related interactions, and discuss the implications of these findings in the design of novel therapeutics for alleviating FA-associated condition, including cancer.

  6. Symptomatic and quality of life outcomes after site-specific fascial reattachment for pelvic organ prolapse repair.

    Science.gov (United States)

    Fayyad, Abdalla M; Redhead, Emma; Awan, Noveen; Kyrgiou, Maria; Prashar, Sanjeev; Hill, Simon R

    2008-02-01

    The aim of this study was to assess symptomatic and quality of life outcome scores following site specific fascial reattachment surgery for pelvic organ prolapse using the validated Prolapse Quality of Life (P-QOL) questionnaires. One hundred and ninety two women underwent surgery for pelvic organ prolapse; ninety four underwent anterior repair (thirty four of them had vaginal hysterectomy), and ninety eight had posterior repair. Patients filled P-QOL questionnaires 24 hours prior to surgery and a postal P-QOL questionnaire six months post operatively. Pre and post operative questionnaires were paired. Quality of life and symptoms scores were calculated using Wilcoxon signed rank test. One hundred and one women returned their questionnaires and were suitable to include in the study. Forty nine underwent anterior repair (fifteen had vaginal hysterectomy) and 52 underwent posterior repair. Quality of life scores showed significant improvement in the anterior and posterior repair groups with the exception of general health in the anterior repair group and general health and prolapse impact in the posterior repair group. Anterior repair significantly improved urinary voiding and storage symptoms. Posterior repair group showed significant improvement in defecatory symptoms. Both groups showed improvement in sexual function and general prolapse symptoms. Prolapse repair with site specific fascial reattachment results in significant improvement in quality of life scores six months after surgery. Anterior repair improves urinary voiding and storage symptoms and posterior repair improves defecatory dysfunction and urinary voiding. Sexual function improves following prolapse repair with site specific fascial reattachment.

  7. Aging and DNA repair capability. [Review

    Energy Technology Data Exchange (ETDEWEB)

    Tice, R R

    1977-01-01

    A review of the literature on DNA repair processes in relation to aging is presented under the following headings: DNA repair processes; age-related occurrence of unrepaired DNA lesions; DNA repair capability as a function of age; tissue-specific DNA repair capability; acceleration of the aging process by exposure to DNA damaging agents; human genetic syndromes; and longevity and DNA repair processes. (HLW)

  8. Nucleotide Excision Repair in Caenorhabditis elegans

    Directory of Open Access Journals (Sweden)

    Hannes Lans

    2011-01-01

    Full Text Available Nucleotide excision repair (NER plays an essential role in many organisms across life domains to preserve and faithfully transmit DNA to the next generation. In humans, NER is essential to prevent DNA damage-induced mutation accumulation and cell death leading to cancer and aging. NER is a versatile DNA repair pathway that repairs many types of DNA damage which distort the DNA helix, such as those induced by solar UV light. A detailed molecular model of the NER pathway has emerged from in vitro and live cell experiments, particularly using model systems such as bacteria, yeast, and mammalian cell cultures. In recent years, the versatility of the nematode C. elegans to study DNA damage response (DDR mechanisms including NER has become increasingly clear. In particular, C. elegans seems to be a convenient tool to study NER during the UV response in vivo, to analyze this process in the context of a developing and multicellular organism, and to perform genetic screening. Here, we will discuss current knowledge gained from the use of C. elegans to study NER and the response to UV-induced DNA damage.

  9. Modified koyanagi repair for severe hypospadias

    Science.gov (United States)

    Vepakomma, Deepti; Alladi, Anand; Ramareddy, Raghu S.; Akhtar, Tanveer

    2013-01-01

    Aim: To report the results of an early series of patients who underwent modified Koyanagi repair for severe hypospadias. Materials and Methods: A total of 24 boys (age: 9 months to 11 years) with proximal hypospadias, chordee, and poor urethral plate underwent modified Koyanagi repair between September 2008 and January 2012. Nine boys had associated penoscrotal transposition that was corrected simultaneously. Vascularized parameatal based foreskin flap was used to correct the hypospadias in a single stage. The follow-up ranged from 6 months to 3.5 years. Results: A total of 13 of the 24 children had a good outcome and were voiding normally, while 11 boys developed complications, 3 of which were major and 8 minor. The major complications were complete breakdown (n = 1), meatal and distal neourethral stenosis requiring laying open of distal urethra (n = 1), and glans breakdown (n = 1). The minor complications included fistulae (n = 5), meatal stenosis amenable to dilatation (n = 1), and lateral chordee (n = 1). Majority of the complications were in the initial patients, with successful outcomes in the last 1 year. Most of these complications were successfully managed by minor second procedures. Conclusion: Modified Koyanagi repair not only corrects severe hypospadias with chordee but also corrects the associated penoscrotal transposition in a single stage. The results are good once the learning curve is crossed. PMID:24019639

  10. Augmented Versus Nonaugmented Repair of Acute Achilles Tendon Rupture: A Systematic Review and Meta-analysis.

    Science.gov (United States)

    Zhang, Yi-Jun; Zhang, Chi; Wang, Quan; Lin, Xiang-Jin

    2017-04-01

    Although simple end-to-end repair of the Achilles tendon is common, many augmented repair protocols have been implemented for acute Achilles tendon rupture. However, whether augmented repair is better than nonaugmented repair of an acute Achilles tendon rupture is still unknown. To conduct a meta-analysis to determine whether augmented surgical repair of an acute Achilles tendon rupture improved subjective patient satisfaction without an increase in rerupture rates. Secondary outcomes assessed included infections, ankle range of motion, calf muscle strength, and minor complications. Meta-analysis. A systematic literature search of peer-reviewed articles was conducted to identify all randomized controlled trials (RCTs) comparing augmented repair and nonaugmented repair for acute Achilles tendon rupture from January 1980 to August 2016 in the electronic databases of PubMed, Web of Science (SCI-E/SSCI/A&HCI), and EMBASE. The keywords (Achilles tendon rupture) AND (surg* OR operat* OR repair* OR augment* OR non-augment* OR end-to-end OR sutur*) were combined, and results were limited to human RCTs and controlled clinical trials published in the English language. Four RCTs involving 169 participants were eligible for inclusion; 83 participants were treated with augmented repair and 86 were treated with nonaugmented repair. Augmented repair led to similar responses when compared with nonaugmented repair for acute Achilles tendon rupture (93% vs 90%, respectively; P = .53). The rerupture rates showed no significant difference for augmented versus nonaugmented repair (7.2% vs 9.3%, respectively; P = .69). No differences in superficial and deep infections occurred in augmented (7 infections) and nonaugmented (8 infections) repair groups during postoperative follow-up ( P = .89). The average incisional infection rate was 8.4% with augmented repair and 9.3% with nonaugmented repair. No significant differences in other complications were found between augmented (7.2%) and

  11. Revision of Failed Artroscopic Bankart Repairs

    Science.gov (United States)

    Muiño, José María Silberberg; Gimenez, Martín Alejandro; Salvucci, Mauro Gabriel Maroa; Ferro, Diego; Rullan, Ramón Muiña

    2017-01-01

    Objectives: To present our functional outcomes from patients treated arthroscopically for a failed Bankart repair, using suture anchors and capsulolabral tissue only. Methods: Series of 22 patients presented with a recurrence of instability after a previous stabilization surgery (3 Latarjet, Bankart 19). We treated them by a an all-arthroscopic procedure, avoiding bone grafts, when glenoid track was found to be enough to proceed. The failure was associated with trauma in 11 patients, a non-anatomic repair in 6 patients, capsular laxity in 4 patients and a non-union of the coracoid graft in 1 patient. Revision surgery included: Bankart repair with anchors in 17 cases, a posterior-inferior capsulo-labral plication in one case, and 5 remplissages. In 4 cases subscapularis augmentation was used because of poor capsular quality. Screw removal was necessary when treating the non-union case. Patients were followed-up by a minimum of 23 months (range 23-26), and evaluated by the UCLA Test, SS test and Rowe score. Results: Thirteen patients had an excellent result, 6 good, 2 satisfactory and one bad result, according to UCLA score. The mean Rowe score was 90.4, at final follow up. The Simple Shoulder Test went from an 8 preoperative to an 11 postoperative, mean scores. 19 of 22 patients returned to the same level of activity prior to the injury. Complications: recurrence in 2 cases, subluxation in 2 and one shoulder stiffness that required an arthrolysis. Conclusion: An arthroscopic revision surgery, after a failed Bankart repair, presents satisfactory results in selected patients. Arthroscopic vision allows a correct diagnosis of injuries as possible causes of failure and subsequent treatment.

  12. Mitochondrial DNA repair: a novel therapeutic target for heart failure.

    Science.gov (United States)

    Marín-García, José

    2016-09-01

    Mitochondria play a crucial role in a variety of cellular processes ranging from energy metabolism, generation of reactive oxygen species (ROS) and Ca(2+) handling to stress responses, cell survival and death. Malfunction of the organelle may contribute to the pathogenesis of neuromuscular, cancer, premature aging and cardiovascular diseases (CVD), including myocardial ischemia, cardiomyopathy and heart failure (HF). Mitochondria contain their own genome organized into DNA-protein complexes, called "mitochondrial nucleoids," along with multiprotein machineries, which promote mitochondrial DNA (mtDNA) replication, transcription and repair. Although the mammalian organelle possesses almost all known nuclear DNA repair pathways, including base excision repair, mismatch repair and recombinational repair, the proximity of mtDNA to the main sites of ROS production and the lack of protective histones may result in increased susceptibility to various types of mtDNA damage. These include accumulation of mtDNA point mutations and/or deletions and decreased mtDNA copy number, which will impair mitochondrial function and finally, may lead to CVD including HF.

  13. Teaching of direct composite restoration repair in undergraduate dental schools in the United Kingdom and Ireland.

    Science.gov (United States)

    Blum, I R; Lynch, C D; Wilson, N H F

    2012-02-01

    To investigate aspects of the teaching of restoration repair as a minimally invasive alternative to the replacement of defective direct composite restorations in teaching programmes in undergraduate curricula in dental schools in the United Kingdom and Ireland. An online questionnaire which sought information in relation to the current teaching of composite restoration repair was developed and distributed to the 17 established UK and Irish dental schools with undergraduate teaching programmes in Spring 2010. Completed responses were received from all 17 schools (response rate= 100%). Fifteen schools reported that they included teaching of repair techniques for defective direct composite restorations in their programme. Of the two remaining schools, one indicated that it would introduce teaching of repair techniques during the next five years. The most common indication for a composite repair was that of 'tooth substance preservation' (15 schools). The defects in restorations considered appropriate for repair rather than replacement by the largest number of schools included partial loss of restoration (13 schools) and marginal defects (12 schools). The most commonly taught surface treatment when performing a repair was mechanical roughening of the existing composite with removal of the surface layer (14 schools). Thirteen schools taught etching and the application of an adhesive bonding agent to the prepared surfaces, while the most commonly taught material for completing the repair was a hybrid composite resin (12 schools). Popular finishing implements included diamond finishing instruments (13 schools) and finishing discs (11 schools). Not withstanding reluctance amongst general dental practitioners, the teaching of repair of a defective composite restoration, rather than total restoration replacement, is firmly established within UK and Irish dental school programmes. Repair techniques have clear advantages for patients, not least including a minimally invasive

  14. The use of Teno Fix tendon repair device in a patient with multiple flexor tendon ruptures

    OpenAIRE

    2010-01-01

    Flexor tendon laceration repairs remain challenging despite numerous advances in hand surgery. Although progress on this vital subject matter has been achieved, there continues to be discussion over which surgical technique produces the optimal result. Currently there are several recommended surgical repair options for the lacerated flexor tendon. However, these repairs continue to have possible significant complications including adhesions, decreased range of motion, gapping, and post operat...

  15. Endovascular abdominal aortic aneurysm repair in the geriatric population

    Institute of Scientific and Technical Information of China (English)

    Athanasios Saratzis; Saif Mohamed

    2012-01-01

    Abdominal aortic aneurysm (AAA) is a relatively common pathology among the elderly. More people above the age of 80 will have to undergo treatment of an AAA in the future. This review aims to summarize the literature focusing on endovascular repair of AAA in the geriatric population. A systematic review of the literature was performed, including results from endovascular abdominal aortic aneurysm repair (EVAR) registries and studies comparing open repair and EVAR in those above the age of 80. A total of 15 studies were identified. EVAR in this population is efficient with a success rate exceeding 90% in all cases, and safe, with early mortality and morbidity being superior among patients undergoing EVAR against open repair. Late survival can be as high as 95% after 5 years. Aneurysm-related death over long-term follow-up was low after EVAR, ranging from 0 to 3.4%. Endovascular repair can be offered safely in the geriatric population and seems to compare favourably with open repair in all studies in the literature to date.

  16. Two-Tunnel Transtibial Repair of Radial Meniscus Tears Produces Comparable Results to Inside-Out Repair of Vertical Meniscus Tears.

    Science.gov (United States)

    Cinque, Mark E; Geeslin, Andrew G; Chahla, Jorge; Dornan, Grant J; LaPrade, Robert F

    2017-08-01

    Radial meniscus tears disrupt the circumferential fibers and thereby compromise meniscus integrity. Historically, radial tears were often treated with meniscectomy because of an incomplete understanding of the biomechanical consequences of these tears, limited information regarding the biomechanical performance of repair, and the technical difficulty associated with repair. There is a paucity of studies on the outcomes of the repair of radial meniscus tears. Purpose/Hypothesis: The purpose was to determine the outcomes of 2-tunnel transtibial repair of radial meniscus tears and compare these results to the outcomes of patients who underwent the repair of vertical meniscus tears with a minimum of 2-year follow-up. The hypothesis was that radial and vertical meniscus tear repair outcomes were comparable. Cohort study; Level of evidence, 3. Patients who underwent 2-tunnel transtibial pullout repair for a radial meniscus tear were included in this study and compared with patients who underwent inside-out repair for a vertical meniscus tear. Subjective questionnaires were administered preoperatively and at a minimum of 2-year follow-up, including the Lysholm score, the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), the Short Form-12 (SF-12) physical component summary (PCS), the Tegner activity scale, and patient satisfaction. Analysis of covariance was used to compare postoperative outcome scores between the meniscus repair groups while accounting for baseline scores. Adjusted mean effects relative to the radial repair group were reported with 95% CIs. Twenty-seven patients who underwent 2-tunnel transtibial pullout repair for radial meniscus tears and 33 patients who underwent inside-out repair for vertical meniscus tears were available for follow-up at a mean of 3.5 years (range, 2.0-5.4 years). No preoperative outcome score significantly differed between the groups. There were no significant group differences for any of the 2-year

  17. Gonioscopically Guided Nonpenetrating Cyclodialysis Cleft Repair: A Novel Surgical Technique

    Science.gov (United States)

    Rodrigues, Ian AS; Shah, Brinda; Goyal, Saurabh

    2017-01-01

    ABSTRACT Aim We present a novel surgical technique for repair of persistent and symptomatic cyclodialysis clefts refractory to conservative or minimally invasive treatment. Background Numerous surgical techniques have been described to close cyclodialysis clefts. The current standard approach involves intraocular repair of cyclodialysis clefts underneath a full-thickness scleral flap. Technique Our technique employs intraoperative use of a direct gonioscope to guide a nonpenetrating surgical repair. Subsequently, a significantly less invasive, nonpenetrating technique utilizing a partial-thickness scleral flap can be performed that reduces potential risks associated with intraocular surgery. The direct gonioscope is also used for confirmation of adequate surgical closure of the cyclodialysis cleft prior to completion of surgery. This technique has been successfully carried out to repair traumatic chronic cyclodialysis clefts associated with hypotony in two patients. There were no significant adverse events as a result of using this technique. Conclusion The novel technique described increases the likelihood of successful and permanent repair of cyclodialysis clefts with resolution of symptoms associated with hypotony, through direct intraoperative visualization of the cleft. Clinical significance Gonioscopically guided nonpenetrating cyclodialysis cleft repair offers significant benefits over previously described techniques. Advantages of our technique include gonioscopic cleft visualization, enabling accurate localization of the area requiring repair, and subsequent confirmation of adequate closure of the cleft. Using a partial-thickness scleral flap is also less invasive and reduces risks associated with treatment of this potentially challenging complication of ocular trauma. How to cite this article Rodrigues IAS, Shah B, Goyal S, Lim S. Gonioscopically Guided Nonpenetrating Cyclodialysis Cleft Repair: A Novel Surgical Technique. J Curr Glaucoma Pract 2017

  18. The indirect effect of radiation reduces the repair fidelity of NHEJ as verified in repair deficient CHO cell lines exposed to different radiation qualities and potassium bromate

    Energy Technology Data Exchange (ETDEWEB)

    Bajinskis, Ainars, E-mail: ainars.bajinskis@gmt.su.se [Centre for Radiation Protection Research, Department of Genetics, Microbiology and Toxicology, Stockholm University, S-10691 Stockholm (Sweden); Olsson, Gunilla; Harms-Ringdahl, Mats [Centre for Radiation Protection Research, Department of Genetics, Microbiology and Toxicology, Stockholm University, S-10691 Stockholm (Sweden)

    2012-03-01

    The complexity of DNA lesions induced by ionizing radiation is mainly dependent on radiation quality, where the indirect action of radiation may contribute to different extent depending on the type of radiation under study. The effect of indirect action of radiation can be investigated by using agents that induce oxidative DNA damage or by applying free radical scavengers. The aim of this study was to investigate the role of the indirect effect of radiation for the repair fidelity of non-homologous end-joining (NHEJ), homologous recombination repair (HRR) and base excision repair (BER) when DNA damage of different complexity was induced by gamma radiation, alpha particles or from base damages (8-oxo-dG) induced by potassium bromate (KBrO{sub 3}). CHO cells lines deficient in XRCC3 (HRR) irs1SF, XRCC7 (NHEJ) V3-3 and XRCC1 (BER) EM9 were irradiated in the absence or presence of the free radical scavenger dimethyl sulfoxide (DMSO). The endpoints investigated included rate of cell proliferation by the DRAG assay, clonogenic cell survival and the level of primary DNA damage by the comet assay. The results revealed that the indirect effect of low-LET radiation significantly reduced the repair fidelity of both NHEJ and HRR pathways. For high-LET radiation the indirect effect of radiation also significantly reduced the repair fidelity for the repair deficient cell lines. The results suggest further that the repair fidelity of the error prone NHEJ repair pathway is more impaired by the indirect effect of high-LET radiation relative to the other repair pathways studied. The response to bromate observed for the two DSB repair deficient cell lines strongly support earlier studies that bromate induces complex DNA damages. The significantly reduced repair fidelity of irs1SF and V3-3 suggests that NHEJ as well as HRR are needed for the repair, and that complex DSBs are formed after bromate exposure.

  19. Ecological evaluation of proposed dredged material from Wilmington Harbor and Military Ocean Terminal, Sunny Point, North Carolina

    Energy Technology Data Exchange (ETDEWEB)

    Ward, J.A.; Pinza, M.R.; Barrows, M.E.; Word, J.Q. [Battelle/Marine Sciences Lab., Sequim, WA (US)

    1993-07-01

    This report is intended to provide information required to address potential ecological effects of the proposed disposal of Wilmington Harbor and Military Ocean Terminal, Sunny Point (MOTSU), North Carolina, sediments in the ocean. The report is divided into five sections. Section 1.0 is the introduction containing a brief overview of the study and the study objectives. Section 2.0 describes the methods and materials used for sample collection, processing, toxicological and bioaccumulation testing, physical/chemical analysis of sediments and tissues, data analysis, and quality assurance procedures. Section 3.0 presents the results of field collections, sediment chemistry, toxicological testing, and tissue chemistry resulting from bioaccumulation exposures. Section 4.0 presents a discussion of the results and summary conclusions concerning the acceptability of the Wilmington Harbor and MOTSU dredged material for ocean disposal. Section 5.0 lists the literature cited in support of this document. A series of appendixes contain detailed data listings.

  20. Sediment quality dredging from Viareggio harbour; Valutazione della qualita` di sedimenti del porto di Viareggio da sottoporre ad escavo

    Energy Technology Data Exchange (ETDEWEB)

    Ausili, A.; Pellegrini, D. [ICRAM, Istituto Centrale per la -ricerca Scientifica e Tecnologica Applicata al Mare, Rome (Italy); Onorati, F.; De Ranieri, S. [CIBM, Centro Interuniversitario di Biologia Marina, Livorno (Italy)

    1998-01-01

    Several areas of Viareggio Harbour (Italy) (inside, outer-port and harbour-entrance) a tourist attended port close to the Thyrrhenian coast, has to be dredged. This operation requires accurate determination of physical, chemical and toxicological characteristics before the following disposal or alternative uses (e.g. in beach nourishment). Sediment texture, heavy metal concentrations, polychlorobiphenyls (PCBs) and polycyclic aromatic hydrocarbons (PAHs) were determined, and preliminary bioassays were performed in order to evaluate sediment quality and toxicity. This study shows that harbour-entrance sediments are mainly clean sands, while in the other sites the finer fraction is dominant. High concentrations of anthropic contaminants in the inner port make them not suitable for the disposal in the dumping site.