Research Articles

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Open Access
1D resistivity inversion technique in the mapping of igneous intrusives; A step to sustainable quarry development
(Elsevier, 2017-11-13) . Nwachukwu, Micheal A.; Nwosu, Leonard I.; Uzoije, Patric A.; Nwoko, Christian A.
The use of trial pits as a first step in quarry site development causes land degradation and results in more failure than success for potential quarry investors in some parts of the world. In this paper, resistivity, depth and distance values derived from 26 Vertical Electric Soundings (VES) and 2 profiling inversion sections were successfully used to evaluate a quarry site prior to development. The target rock Diabase (Dolerite) was observed and it had a resistivity range of 3.0 104 e7. 8 106 U-m, and was clearly distinguishable from associated rocks with its bright red color code on the AGI 1D inversion software. This target rock was overlain by quartzite, indurate shale and mudstone as overburden materials. The quartzite, with its off-red colour, has a resistivity range of 2.0 103 e2.9 105 U-m, while the indurate shale, with a yellowish-brown colour, showed resistivity values ranging from 6.1 102 e 2.8 105 U-m. Topsoil was clayey, with a resistivity range from 8 e 8.6 102u U-m and depths of 0.3e1.8 m, often weathered and replaced by associated rocks outcrops. The diabase rock, in the three prospective pits mapped, showed thicknesses of between 40 and 76 m across the site. The prospective pits were identified to accommodate an estimated 2,569,450 tonnes of diabase with an average quarry pit depth of 50 m. This figure was justified by physical observations made at a nearby quarry pit and from test holes. Communities were able to prepare a geophysical appraisal of the intrusive body in their domain for economic planning and sustainability of the natural resource.
Open Access
5G network deployment in Nigeria: Key challenges and the way forward
(U. P., 2021-03-17) Agubor, Cosmas Kemdirim; Chukwuchekwa, Nkwachukwu; Ezema, Longinus Sunday
Many countries are faced with different challenges in the deployment of 5G mobile wireless communication technology. These challenges have delayed the smooth rollout of this technology in these countries. Nigeria has its own issues that have hindered the implementation of this technology in the country. This paper discusses these challenges and suggestions made on what to do for the implementation of 5G technology. A survey was done by visiting and obtaining reports from two major players in the industry as well as understudying actions taken by other nations in tackling similar problems related to 5G network implementation. Based on the information gathered both from the industry and related literature some useful suggestions such as improved fiber infrastructure and relaxing regulatory barriers to encourage investors were made as a way forward for the full implementation and operation of the 5G technology in Nigeria.
Open Access
A comparative analysis of coconut, palm frond and palm stem fibres as erosion control materials on embankments
(U. P., 2009) Egwuonwu, C. C.; Uzorije, A. P.
The research focused on the use of fibres from coconut pud, palm stem and palm frond in erosion control on embankments. It compared single layer performance of the three fibres on three different slopes and a double layer performance of the coconut fibre. Two coconut fibre nets and a single net each for the palm stem and palm frond were used with a cell dimension of 2cm x 2cm and a boundary dimension of 360cm x 122cm. The fibres were in turn placed over a model of soil embankment in a soil bin. Rain was simulated for 30 minutes over the protected soil and the amount of soil loss deter mined. This soil loss was compared to the loss from the unprotected slope. The single and double layered coconut fibre were found to be more effective in reducing soil loss compared with the control experiment and fibres from palm frond and palm stem. For instance, for a slope of 3%, the soil loss from the single and double layered coconut fibres were 279.4g and 204.3, respectively, compared to 1051.6g, 322.80g and 310.60g for the unprotected soil, the palm stem fibre and palm frond fibre, respectively.
Open Access
A business ecosystem’s model for harnessing Nigeria’s ocean economy
(David Publishing, 2017) Onyemechi, Chinedum; Nwokedi, Theophilus Chinonyerem; Okeke, Okechukwu; Igboanusi, Chinemerem; Chikwendu, David
The reassessment of ocean economy contribution of nations has become a new strategy for frontier states adjacent to the coastal region for the improvement of their position in the efficiency frontier curve. The continuity of a coastal state to remain a leader in the production and efficiency frontier curve of modern day development will thus depend on their ability to sustainably develop their most strategic economic resource base such as the ocean economy. The major economic bases include sustainable fishing, offshore oil field developments, offshore biodiversity development and marine biotechnology, offshore mining of manganese nodules, offshore wind farm potentials, international shipping (marine transport) and adjoining corridor development, ship dry docking potentials, marine renewable energy as well as other potentials outlined in the definition of African Union strategy for the development of her blue economy. Adopting the regression analysis and analysis of variance analytical tools, the study found that about 90% association exist between the GDP (gross domestic product) of the West African state (Nigeria) and her GDP. It equally found that offshore oil and gas energy sector more significantly impact on the GDP of Nigeria than other ocean economy business clusters. Given the various contributing marine environment business cluster used in the work, the model depicting the influence of the ocean economy of Nigeria is: Y = 2295334779895 − 29473X1 + 3436995749 − 5927686X2 + e.
Open Access
A comparative analysis of productivity and fare variations of Nigerian Airlines
(U. P., 2017) Ejem, E. A.; Ekeugo, D. N.; Dike, C. U.; Chukwu, O.; Igboanusi, C. C.; Erumaka, O.
This paper examined productivity variations occurring among different airlines In the study, quantitative techniques such as The pair-wise t-test was utilized in the analysis of the available seat kilometrage (ASK) performed by the various airlines within the study period. The study shows that, there were significant relationships between aircraft utilization, passengers operation and airline productivity, at 0.05 level. The relationship between fare and productivity was statistically insignificant at 0.05 level. There were also productivity variations occurring between different airlines selected for the study. We recommend that efforts should be made to quicken the time spent on the ground by aircrafts of various airlines operating in Nigeria, as less time spent by aircraft on the ground enhances aircraft utilization, which will in the main, boast productivity.
Open Access
A comprehensive review on the feasibility and challenges of millimeter wave in emerging 5G mobile communication
(U. P., 2019) Agubor, Cosmas Kemdirim; Akwukwuegbu, Isdore; Olubiwe, Mathew; Nosiri, Chikezie Onyebuchi; Ehinomen, Atimati; Olukunle, Akande Akinyinka; Okozi, Samuel Okechukwu; Ezema, Longinus; Okeke, Benjamin Chukwujekwu
This article presents a comprehensive review on the feasibility and challenges of millimeter wave in emerging fifth generation (5G) mobile communication. 5G, a multigigabit wireless network is the next generation wireless communication network. The mmWave cellular system which operates in the 30-300 GHz band has been proposed for use as the propagation channel. Its large bandwidth potential makes it a candidate for the next-generation wireless communication system which is believed to support data rates of multiple Gb/s. High frequency bands such as mmWave have channel impairments. These impairments are challenges that are necessary to be properly understood. Employing mmWave as a propagation channel requires dealing with these challenges which this paper is aimed at reviewing. One aim of the work is to discuss these challenges in a more elaborate manner using simple mathematical equations and graphics to ensure clarity. To achieve this, current related works were studied. Challenges and solutions are identified and discussed. Suggested research directions for future work are also presented. One is developing suitable electronic such as fast analog-to-digital (ADC) and digital-to-analog (DAC) systems necessary for the transmitter/receiver (TX/RX) system.
Open Access
A comprehensive review on the feasibility and challenges of millimeter wave in emerging 5G mobile communication
(U.P, 2019) Agubor,Cosmas Kemdirim; Akwukwuegbu, Isdore; Olubiwe, Mathew; Nosiri, Chikezie Onyebuchi; Ehinomen, Atimati; Olukunle, Akande Akinyinka; Okozi, Samuel Okechukwu; Ezema, Longinus; Okeke, Benjamin Chukwujekwu
This article presents a comprehensive review on the feasibility and challenges of millimeter wave in emerging fifth generation (5G) mobile communication. 5G, a multigigabit wireless network is the next generation wireless communication network. The mmWave cellular system which operates in the 30-300 GHz band has been proposed for use as the propagation channel. Its large bandwidth potential makes it a candidate for the next-generation wireless communication system which is believed to support data rates of multiple Gb/s. High frequency bands such as mmWave have channel impairments. These impairments are challenges that are necessary to be properly understood. Employing mmWave as a propagation channel requires dealing with these challenges which this paper is aimed at reviewing. One aim of the work is to discuss these challenges in a more elaborate manner using simple mathematical equations and graphics to ensure clarity. To achieve this, current related works were studied. Challenges and solutions are identified and discussed. Suggested research directions for future work are also presented. One is developing suitable electronic such as fast analog-to-digital (ADC) and digital-to-analog (DAC) systems necessary for the transmitter/receiver (TX/RX) system.
Open Access
A Novel approach to estimation of leak location in an oil pipeline
(U. P., 2015-08) Obibuike, U. J., Obah, B., Aboniyi, C., Anyadiegwu, C. I. C. & Ogwo, O. U. J
This paper presents various approaches to the location of leak in an oil pipeline. However these approaches are based on the available input data for the leak location study. The first approach is the hydraulic gradient intersection approach using Pipes and Excel worksheet. This method relies on the expectation that a leak disturbance settles out eventually to a new Steady-state position. The second approach utilizes a new concept of flow through an orifice and liquid relief through a valve to evolve a criterion for elapsed leak time in an event of a leak as well actual leak time to determine leak location. Orifice area was determined through a liquid relieving scenario and back-pressure at the point of leak assumed to be at atmospheric pressure. A set of mathematical equations were developed and integral solution of the form function of a function was used to solve the resulting differential equation describing the depressurizing process. The model was however validated using a pipeline profile data of a pipeline X which has suffered spill in time past at Niger Delta region where it performed well. The two approaches vary in their input data requirements as mentioned before. Key inputs to the former are the input and output flow conditions of temperature, pressure and flow rate while the latter requires the time (shut-in time and time of leak). Key outputs are the rate variation of flow rates against leak location.
Open Access
A practical guide to site selection for communication antennas and their support structures in Nigeria
(SAVAP International, 2013-01) Agubor, C. K.; Ndinechi, M. C.; Opara, R. O.
Radio broadcasting and telecommunication transmitter stations should have their antennas properly positioned to make them capable of providing the required services. Suitable location of antenna structure will enhance signal clarity, wider coverage area and satisfactory reception of radiated signal. In most cases, engineering considerations in the determination of a station’s performance are treated analytically. However, it is important to know that the ability to serve large audience effectively and at the same time achieve wider signal coverage are greatly affected by the excellence of the transmitter location and its selection must be governed or influenced by experience with intangibles not subject to mathematical calculations. Field survey method was adopted by which information from the major radio and wireless Operators in the country was obtained. The paper therefore focuses on the various factors guiding the selection of suitable transmitter sites. It also presents a step-by-step guide and some important considerations to be taken into account from the planning to the site-acquisition stages. It recommends colocation of infrastructures which is an option not yet attractive to Service Providers in Nigeria.
Open Access
A proposed simpilfied technique for accurate calculation of flared gas volume: Case study of an oil and gas processing plant in Niger Delta
(Society of Scientific Research, 2015) Igwilo, Kevin; Abonyi, Chukwunonoso; Umeh, Ebuka
A simplified technique for an accurate calculation of flared gas volume has been established. Although the regulatory agencies in the oil and gas industry has placed some financial and cost measures to minimize the amount of standard cubic feet of gas flared per day by operating companies yet some operators and contractors could not keep an accurate measurement on the actual amount of gas flare from their production facilities. These shortcomings are partially caused due to lack of technologies, equipment malfunctions, equipment inefficiencies, human resource deficiencies. However, gas flaring is by no means a simple measurement process on its own. This is primarily due to the large variations in conditions often found in a flare stack. Measurement difficulties could also arise through the flare type based on changes in the flow profile and Reynolds number caused by variation in the physical properties of the gases and errors due to installation effects. From the aforementioned points, it is clear that the accurate measurement of the flared gas is a rigorous and complex process with several challenges to be considered. This paper presents a technique for measuring flared gas volume based on PVs (pressure valves) present in process plants. A similar approach has been applied in South Pars gas development projects in Iran; utilizing the design information in PVs datasheet as well as actual plant data for opening percentage values which have been utilized from plant Distributed Control System (DCS ) and PIMS ( Plant Integrated Management System) via excel and visual basic.5 However, in this study, a new/robust software program that has the ability of extracting data from the plant DCS and PIMS server has been developed using Java, correlation used by this software was generated using Hysys for a particular process plant model in Niger-Delta and the correlation was regressed using excel. An iteration time-step of 1440 minutes has been chosen for greater accuracy. Features of this program include flexibility, less run-time error, user friendly, less memory space and real-time. Assumptions made during these calculations were stated clearly in this paper. Key inputs to this program are valve percentage openings per minute. Key outputs are average percentage opening per day and amount of flared per day in million standard cubic feet (MMscf).
Open Access
A review of hydraulic work-over unit (HWU) application for well repairs in Nigeria
(U. P., 2014) Ohia, N.; Anayadiegwu, C.; Igwilo, K.
As part of efforts to encourage indigenous/local content in the area of work-over, re-completion and abandonment in Nigeria, Work over campaigns using a self elevating work-over platform (SEWOP) and a hydraulic work-over (HWU) unit was introduced in the year 2001. These projects provided an opportunity for Nigerian indigenous contractors to work closely with multinational companies with a view to develop expertise. Upon this platform was the services of the HWU introduced to the Nigerian oil & gas industry (for work-over, re-completion, well testing and abandonment) introduced to the Nigerian oil & gas industry. The initial objective of these campaigns was to equip older wells in the land and swamp locations with Surface Control Sub-surface Safety Valves (SCSSV) and top packers, in accordance with company’s well integrity management policy. This policy also required that some of these wells be abandoned to ensure the safety of the environment. It also presented an opportunity to carry out other well repairs and to install gas lift mandrels as the case may be. The projects’ priority factor (if compared with other income generating projects within the system) was low, especially for the abandonments. Hence, recognizing that funds are limited, the services of the HWU provided versatility and cost effectiveness .Between August 2001 and March 2006, a total of about fifty three wells were successfully worked on across the Niger Delta region in land, swamp and offshore locations. These series of operations were not without challenges considering the peculiar nature of the Niger Delta terrain in terms of operation and service delivery. Within the period mentioned above, a “learning curve” was developed for hydraulic workover that can be useful to operators in the oil and gas industry. In this paper, efforts have been made to describe this “curve” for the purposes of improving business results. This paper will also review significant cost saving achievements and challenges that were encountered during the entire period under review.
Open Access
A review of sociological factors associated with diabetes mellitus
(TIJOSS & ARF, 2013-05-30) Azuamah, Y. C.; Imaseun, A. F.; Onoseta, O. H.; Onuoha, P. C.
Diabetes Mellitus is not a single disease entity but rather a group of metabolic disorders sharing the common underlying feature of hyperglycemia. This review paper takes a look at the major sociological factors associated with increased blood glucose levels and its control. Among these factors include the socioeconomic status of individuals, their ethnicity, sex and religion. Other sociological factors mentioned in this paper are people’s lifestyle, obesity, consumption of alcohol, genetics, marital status, health education and age. Genetics is known to be a major factor in diabetes mellitus as many people with diabetes mellitus tend to have family members especially parents and siblings with the disorder. Socioeconomic status also plays a major role as people in the lower socioeconomic status tend to have diabetes more than those in the higher socioeconomic status. Age is also known to be a factor in Type 2 Diabetes as most people with this type of diabetes tend to show symptoms from the age of 40 and above. Other sociological factors mentioned are discussed in detail
Open Access
A review on gas well optimization using production performance models: A case study of horizontal well. Open Journal of Yangtze Gas and Oil, 3, 57 - 67
(Scientific Research Publishing, 2018-01-31) Igwilo, Kevin C.; Okoro, Emeka Emmanuel; Nwude, Anthony Afam; Mamudu, Angela Onose; Onuh, Charles Y.
This study considered the solution methods to determine optimal production rates and the rates of lift gas to optimize regular operational objectives. The foremost tools used in this research are offered as software platforms. Most of the optimization hitches are solved using derivative-free optimization based on a controlled well Performance Analysis, PERFORM. In line with production optimization goal to maximize ultimate recovery at minimum operating expenditure, pressure losses faced in the flow process are reduced between the wellbore and the separator. Nodal analysis is the solution technique used to enhance the flow rate in order to produce wells, categorize constraints and design corrective solution. A hypothetical case is considered and sensitivity analysis using the IPR Models for horizontal gas wells provides the effect on pressure and liquid drop out. The gas lift method is economically valuable as it produced an optimal economic water cut of 80 percent with 2 - 4 MM scf/day rate of gas injection; thus, 1800 - 2000 STB/day gas was produced.
Open Access
A safety culture improvement model for West Africa’s offshore sector
(Science Publishing Group, 2016-12-29) Onyemechi, Chinedum; Sule, Abiodun; Nnadi, Kenneth. U.; Igboanusi, Chinemerem
Abstract: The work analyzed safety paradigms presently being applied in the solution of West Africa’s security and safety problems and proffered solutions based on improved safety culture principles. In the study the safety orientation attributes of offshore vessel operators in West Africa were measured with a view to improving safety in offshore support vessels, Floating, Production, Storage and Operations (FPSO) vessels operating in the region. The contributions of safety orientation to the greening of the blue economy were also analyzed. Also analyzed in the work were accident rates in the sub region in recent times. The work suggested methods for improving operating safety climate in West Africa’s maritime domain. The contributions of continuous learning as well as other safety paradigms were analyzed with a view to reducing accident rates inthe sector.
Open Access
A study of the propagation characteristics of a 13 element yagi-uda antenna
(International Association of Scientific Innovation and Research, 2017) Onwumere, Christogonus; Agubor, Cosmas Kemdirim
This paper reports the propagation characteristics of a 13- element 640MHz Yagi antenna.The Yagi-Uda antenna is a highly directional antenna and in the transmit mode propagates electromagnetic energy in the direction running from the dipole or driven element toward the director and is sensitive to incoming electromagnetic energy in the receive direction. In this study, NBS 688 technical notes and antenna design curves were used and the resulting antenna estimate was modeled. The simulation and optimization was carried out using 4NEC2 antenna design software. Verification of the optimal design was achieved using EZNEC v.6.0 antenna modeler. The simulation result showed Antenna characteristics such as input impedance, radiated power, efficiency and far-field radiation pattern.
Open Access
A survey on the availability of TV white spaces in Eastern Nigeria
(U. P., 2015) Atimati, E. E.; Ezema, L. S.; Ezeh, G. N.; Iwuchukwu, U. C.; Agubor, C. K.
Effective utilization of future wireless communication systems such as the TV White spaces depend largely on the availability of free unused spectrum within the 470 – 860MHz UHF band. The paper, analyses the effectiveness of TV White space for last mile delivery of broadband based on spectral availability. The survey was carried out on a spectral range of 470 – 870MHz within the study area, using a RF spectrum analyser and the readings were presented using graph plots through the aid of Touchstone PC spectrum analyser. Fixed measurement was adopted and two (2) sites were chosen to take measurement. The results revealed that, 64% of the 50 channels surveyed were dormant. The degree of occupancy was found to be very low, thus providing for unused spectra spaces within the UHF frequency band which can be used to provide broadband services in sparsely populated rural areas; where data rate could be compromised for range at zero or low cost for acquiring operating spectral license
Open Access
A tobit analysis of propensity to discontinue adoption of yam minisett technology among farmers in Anambra State, Nigeria
(Conscientia Beam, 2017-06-29) Anaeto, F. C.; Okereke- Ejiogu, N.; Uke, P. C.; Korie, O. C.; Ohajianya, D. O.
This study analyzed farmers’ propensity to discontinue adoption of yam minisett technology in Anambra State, Nigeria. Data were collected in 2015 with validated questionnaire from 134 proportionately and randomly selected yam farmers. Data collected were analyzed using the Tobit model. Results of the estimation showed that significant variables leading to discontinuance of adopted yam minisett technology were extension visit, participation in extension related workshops, feedback provision, input availability, and perception of yield. Foremost among these factors were extension visits and participated in extension related workshops which therefore should be sustained after farmers have adopted a technology.
Open Access
Accomodation lag among corrected myopes and emmetropes: A comparative study
(IJRSFP, 2018-12-28) Azuamah, Y. C.; Kalakeya, L. C.; Esenwah, E. C.; Ikoro, N. C.; Megwas, A. U.; Azuamah, E. C.
Accommodation lag is the amount by which the accommodative response of the eye is less than the dioptric stimulus to accommodation. This study was carried out at the Optometry Teaching Clinic, Federal University of Technology, Owerri, Nigeria to compare the accommodation lag of corrected myopes and emmetropes. A total of 68 subjects between the ages of 18 and 30 and a mean age of 23.15±2.85 were used for this study. The accommodation lag was determined by taking the difference between the static and dynamic retinoscopic findings of each subject. Results obtained showed that 18(26.47%) myopes recorded a value of between -0.25DS and -1.00DS for both static and dynamic retinoscopy. For a finding of -1.25DS to -2.00DS, there were 7(10.29%) and 8(11.76%) myopes for static and dynamic retinoscopy respectively. The distribution of retinoscopic findings among emmetropes showed that 17(25%) and 7(10.30%) emmetropes recorded a value of between plano and -0.25DS for static and dynamic retinoscopy respectively. For a finding of +0.25DS to +0.50DS, there were 16(23.53%) and 20(29.41%) emmetropes for static and dynamic retinoscopy respectively. The mean value for accommodation lag among the myopes was 0.35±0.24D. For the emmetropes, the mean accommodation lag was 0.24±0.27D. Data analysis with SPSS version 21 using the Independent Sample T test revealed that there was no significant difference (P>0.05) in accommodation lag between the corrected myopes and the emmetropes used in this study. Myopes were advised to always put on their prescription glasses to ensure an improvement of their accommodative response.
Open Access
Activated orange meso-carp carbon (AOMC); an acceptable remediation techniques for crude oil pollution effect
(Maxwell Scientific Organization, 2012-01-01) Atulegwu, Patrick Uzoije; Uzoigwe, Luke O.; Kamalu , C. I. O.
Orange mesocarp with its potentials application to remove spilled crude oil was used to prepare an activated adsorbent. Therefore, adsorption of crude oil onto the activated orange meso-carp (AOMC) was investigated. Batch experiment was adopted for the equilibrium studies and the studies were conducted for various operational parameters such as varying crude oil concentration and temperature values. The crude oil samples of A, B, C, D and E, with concentrations 6045, 4393, 8508, 11583, and 5220, respectively and temperature values varied between 10-50ºC were used for the experiment. The adsorption equilibrium was established at 40 min of adsorption time. Partition coefficients, kd (L/kg) for various samples reacted inversely with temperature and were in the ranges of 0.37-0.69, 0.65-1.11, 1.28-2.04, 1.17-1.39 and 1.23-4.53 for samples A, B, C, D and E, respectively. percentage of crude oil samples on the AOMC decreased with low crude oil hydrocarbons and the trend was shown as follows D>C >A>E>B. Percentage ranges for samples A, B, C,D and E were given to be 86.8-88%, 60.5-72.4, 52.5-55.2, 47.9-55.4 and 45.3-49.2%, respectively. Sorption of the crude oil samples to AOMC was found to be spontaneous, exothermic, and physio-sorption controlled with G values being in the ranges of -71.49 to -21.29, -18.25 to -5.43, -30.24 to -21.11, -28.55 to -11.33 and -50.74 to -50.12 KJ/mol for samples A ,B , C , D and E, respectively. Enthalpy(H) and Entropy changes(S) were also found to be -10.28, -12.24, -8.92, -6.9, -50.28 J/mol/K and -2.92, -0.32, -0.50, -0.44, -0.01 for samples A, B, C, D and E, respectively. Activated orange meso-carp provides a veritable environmentally remediation technique for crude oil spillage.
Open Access
Addressing corruption practices in agricultural sector to make agriculture demand-driven in Nigeria
(Spring Journals, 2016-11) Godson-Ibeji, C. C.; . Ogueri, E. I.; Chikaire, J. U.
Agriculture is one aspect of Nigeria’s economy that should not be neglected or even marginalised. Not only that agriculture is the major source of food for people and livestock, it also provides earnings to farmers and raw materials for industries as well as providing over sixty-five percent employment to the teeming population of Nigerians. In spite of all these advantages over other professions such as law, medicine, engineering and others, yet, people in Nigeria still express phobia for agriculture as an enterprise. Corruption in agricultural sector is an impediment which, when fought and eliminated will make agriculture demand-driven in Nigeria. This paper therefore takes a cursory look at some aspects of corrupt practices in agricultural sector and their attendants’ effects on agricultural productions. It concludes among other suggestions that to fight and eliminate corruption in agricultural sector and achieve the implementations of the Nigerian agricultural transformation agenda (ATA) as well as make agriculture demand-driven in Nigeria, those actors who perpetuate the nefarious acts of corruption in the sector should be reprimanded by the law and made to face the penalties.